WO2025039301A1 - Battery, electric device and gas concentration measuring method - Google Patents

Abstract

A battery, an electric device and a gas concentration measuring method. The battery comprises a housing, a battery cell and an infrared gas sensor. The housing has an accommodating space. The battery cell has an electrolyte therein and is accommodated in the accommodating space. The infrared gas sensor is arranged in the accommodating space and is located outside of the battery cell. The infrared gas sensor is used for measuring the concentration of gas volatilized by an organic solvent of the electrolyte in the accommodating space. In this way, electrolyte leakage can be rapidly and accurately detected, thereby reducing the use risk of the battery.

Description

Battery, electrical device and gas concentration detection method [Technical field]

The present application relates to the field of battery technology, and in particular to batteries, electrical devices and gas concentration detection methods.

[Background technology]

With the development of battery technology, battery cells are used in more and more fields and are gradually replacing traditional petrochemical energy in the field of automotive power. Battery cells can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable battery cells, the active material can be activated by charging after discharge and continue to be used.

Generally, a battery is provided with a battery cell, and an electrolyte is provided in the battery cell. During the production, transportation and use of the battery, the battery cell has the risk of leakage. In existing batteries, it is difficult to quickly and accurately detect electrolyte leakage due to interference from the environment outside the battery cell, which increases the risk of battery use.

[Summary of the invention]

In view of the above problems, the present application provides a battery, an electrical device and a gas concentration detection method, which can quickly and accurately detect electrolyte leakage and reduce the risk of battery use.

In a first aspect, the present application provides a battery, the battery comprising a housing, a battery cell and an infrared gas sensor. The housing has a storage space. The battery cell has an electrolyte inside and is stored in the storage space. The infrared gas sensor is arranged in the storage space and is located outside the battery cell. The infrared gas sensor is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte in the storage space.

In the above manner, by setting up an infrared gas sensor to detect the concentration of the volatile gas of the organic solvent of the electrolyte in the containing space, the interference of the environment outside the battery can be reduced and the accuracy of the detection can be improved. Since the organic solvent component of the electrolyte is relatively unique, the organic solvent component of the electrolyte can be specifically identified by using an infrared gas sensor, which is beneficial for timely detection of electrolyte leakage in the initial stage of electrolyte leakage, improving detection sensitivity, and thus helping to reduce the hazards caused by electrolyte leakage.

In some embodiments, the infrared gas sensor is used to detect the gas volatilized from the organic solvent of the electrolyte within a first preset infrared wavelength range.

Through the above method, in the process of detecting the gas volatilized by the organic solvent of the electrolyte, the infrared gas sensor can detect the infrared absorption peak of the gas volatilized by the organic solvent of the electrolyte within the first preset infrared wavelength range, which can reduce the interference of the gas with the infrared absorption peak outside the first preset infrared wavelength range on the detection result, and improve the accuracy and reliability of the detection result.

In some embodiments, the first preset infrared wavelength range is 5-6 μm.

Through the above method, the infrared gas sensor can easily generate infrared light in this wavelength range, and the infrared light in this range is relatively stable, reliable, and not easily interfered with. It can detect the gas volatilized by the organic solvent in the containing space and detect the electrolyte leakage in time, which is beneficial to reduce the hazards caused by the electrolyte leakage.

In some embodiments, the first preset infrared wavelength range is 5.5-5.9 μm.

Through the above method, the infrared gas sensor can detect the gas volatilized by the organic solvent in the containing space, and detect the electrolyte leakage in time, which is helpful to reduce the harm caused by the electrolyte leakage.

In some embodiments, the organic solvent of the electrolyte includes at least one of dimethyl carbonate, propylene carbonate, diethyl carbonate, and ethylene carbonate.

Through the above-mentioned method, dimethyl carbonate, propylene carbonate, diethyl carbonate, ethylene carbonate and the like can be effectively responded to by the infrared gas sensor for concentration detection, thereby timely detecting electrolyte leakage.

In some embodiments, the battery cell includes an electrode assembly immersed in an electrolyte. The infrared gas sensor is used to detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly within a second preset infrared wavelength range.

Through the above method, in the process of detecting the volatilized gas generated by the reaction between the electrolyte and the electrode assembly, the infrared gas sensor can detect the infrared absorption peak of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly within the second preset infrared wavelength range, which can reduce the interference of the gas whose infrared absorption peak is outside the second preset infrared wavelength range on the detection result. Gases associated with the electrolyte can be detected from different preset infrared wavelength ranges, which can more effectively and timely detect electrolyte leakage and improve the accuracy and reliability of the detection results.

In some embodiments, the second preset infrared wavelength range is 4-4.9 μm.

Through the above method, the infrared gas sensor can easily generate infrared light in this wavelength range, and the infrared light in this range is relatively stable, reliable, and not easily interfered with. It can detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly in the accommodation space, and detect electrolyte leakage in time, which is beneficial to reduce the hazards caused by electrolyte leakage.

In some embodiments, the second preset infrared wavelength range is 4.2-4.7 μm.

Through the above method, the infrared gas sensor can detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly.

In some embodiments, the gas volatilized by the reaction between the electrolyte and the electrode assembly includes at least one of carbon monoxide and carbon dioxide.

In the above manner, the infrared gas sensor can detect the gas volatilized by the reaction between the electrolyte and the electrode assembly by detecting the infrared absorption peak of at least one of carbon monoxide and carbon dioxide.

In some embodiments, the infrared gas sensor includes an infrared emitting end, an infrared receiving end, and a filter. The filter is disposed between the infrared emitting end and the infrared receiving end. The infrared emitting end is used to emit infrared light to the space between the infrared emitting end and the filter. The space between the infrared emitting end and the filter can be used to accommodate gas. The filter is used to allow infrared light in a preset infrared wavelength range to pass through and enter the infrared receiving end.

In the above manner, it is possible to determine whether there is a gas with an infrared absorption peak within a preset infrared wavelength range in the space between the infrared emitting end and the filter according to whether the infrared receiving end receives infrared light.

In some embodiments, the infrared gas sensor includes a cavity having an optical cavity and an air inlet, the infrared transmitting end is used to transmit infrared light into the optical cavity, and the infrared receiving end is used to receive the infrared light in the optical cavity and passing through the filter. The air inlet is used to guide the gas into the optical cavity.

By means of the above method, the optical cavity is provided to control the propagation path of the infrared light, so as to facilitate sensing of the absorption of the infrared light.

In some embodiments, the battery further includes a VOC sensor disposed in the accommodation space for detecting the concentration of volatile organic compounds in the accommodation space. And/or, the battery includes a temperature sensor disposed in the accommodation space for detecting the temperature of the battery cell.

In the above manner, on the basis of the infrared gas sensor detecting the volatile gas of the organic solvent of the electrolyte, the VOC sensor can be used to detect the volatile organic matter in the storage space. By setting up multiple types of sensors, the various states of the battery can be effectively monitored, and the state of the battery can be more comprehensively understood. By using the VOC sensor to detect the volatile organic matter in the storage space, the battery can be monitored from another angle, which is convenient for more effective detection of battery problems, such as electrolyte leakage or possible thermal runaway. In addition, on the basis of the infrared gas sensor detecting the volatile gas of the organic solvent of the electrolyte, a temperature sensor is added. Since the charging and discharging of the battery often causes the temperature to rise and cause various abnormalities, the battery state can be further comprehensively judged from the perspective of temperature to improve the reliability of battery monitoring.

In some embodiments, the battery further includes a hydrogen sensor, which is disposed in the accommodation space and is used to detect the concentration of hydrogen in the accommodation space.

In the above manner, by setting up a hydrogen sensor to specifically detect the concentration of hydrogen in the accommodating space, the condition of the battery cell can be detected in time when the battery cell is damaged or thermally runaway, which is helpful to reduce the problems caused by the damage of the battery cell.

In some embodiments, the hydrogen sensor includes at least one of a thermal conductivity hydrogen sensor and a palladium alloy hydrogen sensor.

In the above manner, by providing at least one of a thermal conductivity hydrogen sensor and a palladium alloy hydrogen sensor, the concentration of hydrogen in the accommodation space can be specifically detected, and the condition of the battery cell can be detected in time when the battery cell is damaged or thermally runaway, thereby helping to reduce the problems caused by damage or thermal runaway of the battery cell.

In some embodiments, the battery further includes a laser gas sensor, which is disposed in the accommodation space and is used to detect the concentration of methane in the accommodation space.

Through the above method, the concentration of methane in the containing space can be specifically detected, and the condition of the battery cell can be detected in time when the battery cell is damaged, which is helpful to reduce the problems caused by battery cell damage or thermal runaway.

In some embodiments, the battery includes a processor, which is coupled to the infrared gas sensor and is used to obtain the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor.

Through the above method, the processor can obtain the concentration of volatile gases of the organic solvent of the electrolyte detected by the infrared gas sensor, and then can effectively detect whether there is leakage of the electrolyte and whether it will cause other risks, which is convenient for formulating strategies according to the information of the concentration of volatile gases of the organic solvent of the electrolyte, which is conducive to the realization of intelligent battery.

In some embodiments, the processor is used to determine whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to a first threshold and less than or equal to a second threshold. If it is greater than or equal to the first threshold and less than or equal to the second threshold, a first warning message is output; if it is greater than the second threshold, a second warning message different from the first warning message is output.

In the above manner, through the step-by-step judgment of different thresholds, the concentration of the volatile gas of the organic solvent of the electrolyte can be judged in a step-by-step manner, and then whether a leakage occurs or has occurred can be classified in a step-by-step manner, which can more accurately and precisely determine the problems with the battery, thereby making subsequent response measures more reasonable and reliable.

In some embodiments, the ratio of the second threshold to the first threshold is greater than or equal to 50.

By setting the threshold of such a ratio in the above manner, it is possible to effectively distinguish the concentrations under different circumstances, and it is convenient to distinguish the situations corresponding to the concentrations under different thresholds, such as large leakage and mild leakage of electrolyte. If the ratio is too small, it is difficult to distinguish different situations. If the ratio is too large, it is not easy to sensitively understand the gas concentration. In addition, the setting of the above ratio is conducive to giving full play to the detection function of the infrared gas sensor, so that the battery can detect the volatilized gas of the organic solvent of the electrolyte in a larger concentration range and formulate targeted countermeasures according to the detection results.

In some embodiments, the battery cell includes an electrode assembly immersed in an electrolyte. The infrared gas sensor is also used to detect the concentration of gas volatilized by the reaction between the electrolyte and the electrode assembly. The processor is used to obtain the concentration of gas volatilized by the reaction between the electrolyte and the electrode assembly detected by the infrared gas sensor. The processor is used to determine whether the concentration of gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to a third threshold when the concentration of gas volatilized by the organic solvent of the electrolyte is less than the first threshold. If it is greater than or equal to the third threshold, a third warning message is output.

Through the above method, when the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold value, the leakage of the electrolyte cannot be detected here (or the leakage is not obvious, or the detection sensitivity is not reached), and by judging whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold value, it is further detected whether the electrolyte is leaking. Detecting whether the electrolyte is leaking from multiple angles can obtain more battery status information and perform more comprehensive measurements on the battery, which is conducive to improving the level of refinement of battery management.

In some embodiments, the battery further includes a VOC sensor, which is disposed in the accommodation space and is used to detect the concentration of volatile organic compounds in the accommodation space. The processor is coupled to the VOC sensor and is used to obtain the concentration of volatile organic compounds detected by the VOC sensor. The processor is used to determine whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold when the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is less than the third threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, a fourth warning message is output.

In the above manner, the processor can detect the volatile organic matter in the accommodation space through the VOC sensor, thereby effectively monitoring various states of the battery, more comprehensively understanding the state of the battery, and more effectively discovering battery problems, such as electrolyte leakage or possible thermal runaway, etc. The processor can also determine whether the volatile organic matter outside the battery cell has increased significantly, so that when detecting the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly, the interference of the volatile organic matter from the outside of the battery cell on the detection result can be reduced, thereby improving the detection accuracy.

In some embodiments, the battery includes a temperature sensor, which is disposed in the accommodation space and is used to detect the temperature of the battery cell. The processor is coupled to the temperature sensor and is used to obtain the temperature detected by the temperature sensor. The processor is used to determine whether the temperature is greater than or equal to a preset temperature threshold when the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, and if it is greater than or equal to, output a fifth warning message.

Through the above method, a temperature sensor is added on the basis of the infrared gas sensor detecting the volatile gas of the organic solvent of the electrolyte. Since the charging and discharging of the battery often causes the temperature to rise and cause various abnormalities, the processor can further combine the temperature perspective to comprehensively judge the state of the battery, thereby improving the reliability of battery monitoring. When there is a problem with the operation of the battery cell, it is helpful to quickly discover and promptly control the problem of the battery cell operation.

In some embodiments, the battery further includes a VOC sensor, which is disposed in the accommodation space and is used to detect the concentration of volatile organic compounds in the accommodation space. The processor is coupled to the VOC sensor and is used to obtain the concentration of volatile organic compounds detected by the VOC sensor. The processor is used to determine whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold when the temperature is less than a preset temperature threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, a sixth warning message is output.

The above method is helpful to reduce the harm caused by electrolyte leakage.

In some embodiments, the battery cell has a wall portion, and an explosion-proof valve is disposed on the wall portion. The infrared gas sensor is disposed on the housing and is disposed opposite to the wall portion, or is disposed on the wall portion.

Through the above method, the infrared gas sensor can detect the gas overflowing from the explosion-proof valve in time, which is conducive to the rapid detection of gas breaking through the explosion-proof valve and reducing the risk caused by thermal runaway of the battery cell.

In some embodiments, the battery includes a circuit board, and the infrared gas sensor is disposed on the circuit board. The housing includes a top, a bottom, and a side connected between the top and the bottom. The top, the bottom, and the side are collectively enclosed to form a receiving space. The battery cell has a wall, and the wall is provided with an explosion-proof valve. The top is disposed opposite to the wall. The circuit board is disposed on the top, the wall, or between the top and the wall.

Through the above method, the infrared gas sensor can detect the gas flowing out of the explosion-proof valve in time, which is conducive to the rapid detection of the gas breaking through the explosion-proof valve and reducing the risk caused by thermal runaway of the battery cell.

In some embodiments, the circuit board is electrically connected to the battery cell via leads so that the battery cell supplies power to the circuit board.

Through the above method, the lead wires can be arranged inside the shell, which simplifies the line connection of the battery and makes the line connection more stable, which is beneficial to improving the working stability of the battery.

In a second aspect, the present application provides an electrical device comprising the above-mentioned battery.

In a third aspect, the present application provides a gas concentration detection method, which is applied to the above-mentioned battery cell. The gas concentration detection method includes: detecting the concentration of the gas volatilized by the organic solvent of the electrolyte by an infrared gas sensor; and obtaining the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor.

In some embodiments, after obtaining the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor, it includes: judging whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold. If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, a first warning message is output. If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than the second threshold, a second warning message different from the first warning message is output.

In some embodiments, after determining whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, the method includes: if the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, then obtaining the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly detected by the infrared gas sensor, and determining whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold. If the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold, outputting a third warning message.

In some embodiments, after determining whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold, the method includes: if the gas volatilized by the reaction between the electrolyte and the electrode assembly is less than the third threshold, obtaining the concentration of volatile organic compounds detected by the VOC sensor, and determining whether the concentration of the volatile organic compounds is greater than or equal to the fourth threshold. If the concentration of the volatile organic compounds is greater than or equal to the fourth threshold, outputting a fourth warning message.

In some embodiments, after determining whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, the method includes: if the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, obtaining the temperature of the battery cell detected by the temperature sensor, and determining whether the temperature of the battery cell is greater than or equal to the preset temperature threshold. If the temperature of the battery cell is greater than or equal to the preset temperature threshold, outputting the fifth warning information.

In some embodiments, after determining whether the temperature of the battery cell is greater than or equal to a preset temperature threshold, the method includes: if the temperature of the battery cell is less than the preset temperature threshold, obtaining the concentration of volatile organic compounds detected by the VOC sensor, and determining whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold when the temperature of the battery cell is less than the preset temperature threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, outputting a sixth warning message.

The above description is only an overview of the technical solution of this application. The present invention is implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

【Brief Description of the Drawings】

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

FIG4 is a schematic diagram showing a comparison of infrared absorption spectra of different gases;

FIG5 is a schematic diagram of the structure of the infrared gas sensor shown in FIG3 ;

FIG6 is a schematic block diagram of a circuit structure of a battery according to one or more embodiments;

FIG. 7 is a schematic flow chart of a gas concentration detection method according to one or more embodiments.

The reference numerals in the specific implementation manner are as follows:

1000a vehicles;

100a battery; 200a controller; 300a motor;

10a housing; 11a first part; 12a second part; 101b receiving space; 104 top; 105 bottom; 106 side;

1 battery cell; 100 shell; 101 wall; 103 explosion-proof valve; 110 containing shell; 112 opening; 120 end cover; 121 electrode column; 130 infrared gas sensor; 131 infrared transmitting end; 132 infrared receiving end; 133 filter; 134 optical cavity; 135 air inlet; 136 cavity; 140 VOC sensor; 150 temperature sensor; 160 hydrogen sensor; 170 laser gas sensor; 180 processor; 200 electrode assembly; 201 pole ear; 300 circuit board; 301 lead wire.

[Specific implementation method]

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

With the development of battery technology, battery cells are used in more and more fields and gradually replace traditional fossil energy in the field of automobile power. Battery cells can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable battery cells, the active material can be activated by charging after discharge and continue to be used.

The battery contains a battery cell, and the battery cell contains electrolyte. During the production, transportation and use of the battery, the battery cell has the risk of leakage. In existing batteries, due to the interference of the environment outside the battery cell, it is difficult to quickly and accurately detect electrolyte leakage when the electrolyte leaks, which increases the risk of battery use.

In order to improve the sensitivity and accuracy of detecting electrolyte leakage, by arranging the infrared gas sensor in the accommodation space, the infrared gas sensor can sense the gas generated by the volatilization of the organic solvent in the electrolyte. The infrared gas sensor can also detect the concentration of the gas generated by the volatilization of the organic solvent in the electrolyte, thereby being able to quickly and accurately detect electrolyte leakage.

Based on the above considerations, the present application provides a battery, an electrical device and a gas concentration detection method. Among them, the battery includes a shell, a battery cell and an infrared gas sensor. The shell has a storage space. The battery cell has an electrolyte inside and is contained in the storage space. The infrared gas sensor is arranged in the storage space and is located on the outside of the battery cell. The infrared gas sensor is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte in the storage space. In this way, the infrared gas sensor can perform specific detection of the gas volatilized by the organic solvent of the electrolyte, which can reduce the interference of the environment outside the battery cell, improve the accuracy of detection, and is also conducive to timely detection of electrolyte leakage in the initial stage of electrolyte leakage, thereby improving the detection sensitivity.

The battery, electrical device, and gas concentration detection method disclosed in the embodiments of the present application can be used for electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

For the convenience of description, the following embodiments are described by taking a vehicle 1000a as an example of an electrical device in an embodiment of the present application.

Please refer to Figure 1. Vehicle 1000a can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100a is arranged inside the vehicle 1000a. The battery 100a can be arranged at the bottom, head or tail of the vehicle 1000a. The battery 100a can be used to power the vehicle 1000a. For example, the battery 100a can be used as an operating power source for the vehicle 1000a. The vehicle 1000a can also include a controller 200a and a motor 300a. The controller 200a is used to control the battery 100a to power the motor 300a, for example, for the starting, navigation and driving power requirements of the vehicle 1000a.

In some embodiments of the present application, the battery 100a can not only serve as the operating power source of the vehicle 1000a, but also serve as the driving power source of the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

The battery 100 a mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell 1 that can be continuously used by activating the active material by charging after the battery cell 1 is discharged. Each battery cell 1 may also be a primary battery.

The battery cell 1 includes but is not limited to lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc. The battery cell 1 can be cylindrical, flat, rectangular or other shapes.

In some embodiments, the battery 100a may be a battery module. When there are multiple battery cells 1, the multiple battery cells 1 are arranged and fixed to form a battery module.

In some embodiments, referring to FIG. 2 , the battery 100a may be a battery pack, which includes a housing 10a and a battery cell. The battery body 1, the battery cell 1 or the battery module is accommodated in the housing 10a.

In some embodiments, the housing 10a may be a part of the chassis structure of the vehicle 1000a. For example, a portion of the housing 10a may become at least a portion of the floor of the vehicle 1000a, or a portion of the housing 10a may become at least a portion of the cross beam and longitudinal beam of the vehicle 1000a.

Please refer to FIG. 2 , the battery 100a includes a shell 10a and a battery cell 1, and the battery cell 1 is contained in the shell 10a. The shell 10a is used to provide a storage space 101b for the battery cell 1, and the shell 10a can adopt a variety of structures. In some embodiments, the shell 10a may include a first part 11a and a second part 12a, and the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define a storage space 101b for accommodating the battery cell 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure, and the first part 11a covers the open side of the second part 12a, so that the first part 11a and the second part 12a jointly define the storage space 101b; the first part 11a and the second part 12a may also be hollow structures with one side open, and the open side of the first part 11a covers the open side of the second part 12a. Of course, the housing 10a formed by the first portion 11a and the second portion 12a may be in various shapes, such as a cylinder, a cuboid, etc.

In the battery 100a, there can be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 1 are both connected in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the shell 10a; of course, the battery 100a can also be a battery module formed by connecting multiple battery cells 1 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the shell 10a. The battery 100a can also include other structures. For example, the battery 100a can also include a busbar component for realizing electrical connection between the multiple battery cells 1.

Referring to FIG3 , a battery cell 1 refers to the smallest unit constituting a battery. In this embodiment, a cylindrical battery cell is used as an example for description. As shown in FIG3 , the battery cell 1 includes a housing 100 , an electrode assembly 200 and other functional components.

In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and electrolyte components. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

The housing 100 may include an end cap 120 and a containment shell 110. The end cap 120 refers to a component that covers the opening of the containment shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the containment shell 110 to match the containment shell 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 120 is not easily deformed when squeezed and collided, so that the battery cell 1 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode columns 121 may be provided on the end cap 120. The electrode column 121 can be used to be electrically connected to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 120 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end cap 120 may also be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component may be provided inside the end cap 120, and the insulating component may be used to isolate the electrical connection components in the housing 110 from the end cap 120 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

The containment shell 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 200, the electrolyte and other components. The containment shell 110 and the end cap 120 can be independent components, and an opening 112 can be set on the containment shell 110, and the end cap 120 is made to cover the opening 112 at the opening 112 to form the internal environment of the battery cell 1. Without limitation, the end cap 120 and the containment shell 110 can also be integrated. Specifically, the end cap 120 and the containment shell 110 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the containment shell 110, the end cap 120 is made to cover the containment shell 110. The containment shell 110 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the containment shell 110 can be determined according to the specific shape and size of the electrode assembly 200. The material of the housing 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The electrode assembly 200 is a component where an electrochemical reaction occurs in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO ₄ (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO ₄ ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO ₂ ), lithium nickel oxide (such as LiNiO ₂ ), lithium manganese oxide (such as LiMnO ₂ , LiMn2O ₄ ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi _1/3 Co _1/3 Mn _1/3 O ₂ (also referred to as NCM ₃₃₃ ), LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (also referred to as NCM ₅₂₃ ), LiNi _0.5 Co _0.25 Mn _0.25 O 2 (also referred to as NCM ₂₁₁ ), LiNi _0.6 Co _0.2 Mn 0.2 O ₂ (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn _0.1 O ₂ (also referred to as NCM ₈₁₁ ), and LiNi _0.8 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM ₈₁₁ ), lithium nickel cobalt aluminum oxide (such as LiNi _0.85 Co _0.15 Al _0.05 O ₂ ) and modified compounds thereof.

In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

As an example, the negative electrode current collector can be a metal foil, a foamed metal, a composite current collector or a foamed carbon. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, etc. The composite current collector can include a polymer material base and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the negative electrode sheet may include a negative electrode collector and a negative electrode active material disposed on at least one surface of the negative electrode collector.

As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

As an example, the main material of the isolation membrane can be selected from glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. At least one of olefins and ceramics. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

In some embodiments, the battery cell 1 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

The electrolyte may be a form of electrolyte and may include electrolyte salt and solvent.

In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

As an example, the polymer solid electrolyte may be polyether, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, etc. As an example, the polymer solid electrolyte may be polyethylene oxide.

As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

In some embodiments, the electrode assembly 200 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

In some embodiments, the electrode assembly 200 is provided with a tab 201, which can lead current from the electrode assembly 200. The tab includes a positive tab and a negative tab. The positive tab and the negative tab can be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery 100a, the positive active material and the negative active material react with the electrolyte, and the tab 201 connects the electrode column 121 to form a current loop.

According to some embodiments of the present application, as shown in FIG. 2 and FIG. 3, the battery 100a described in the battery embodiment of the present application includes a housing 10a, a battery cell 1, and an infrared gas sensor 130. The housing 10a has a receiving space 101b. The battery cell 1 has an electrolyte inside and is received in the receiving space 101b. The infrared gas sensor 130 is disposed in the receiving space 101b and is located outside the battery cell 1. The infrared gas sensor 130 is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte in the receiving space 101b.

The electrolyte may include an electrolyte salt and an organic solvent. For example, the electrolyte salt may be a lithium salt, and the solvent may include organic solvents such as lipids and ethers. During the production, transportation and use of the battery 100a, the battery 100a is at risk of leakage. Specifically, during the production, transportation and use of the battery 100a, there is a risk that the inside of the battery cell 1 is connected to the outside of the battery cell 1, resulting in a risk that the electrolyte leaks to the outside of the battery cell 1. When the inside of the battery cell 1 is connected to the outside of the battery cell 1, the organic solvent or the volatile gas of the organic solvent may enter the outside of the battery cell 1 in the storage space 101b. The volatile gas of the organic solvent of the electrolyte in the storage space 101b may come from the inside of the battery cell 1, or may be generated by the volatilization of the organic solvent on the outside of the battery cell 1. By providing an infrared gas sensor 130, the volatile gas of the organic solvent on the outside of the battery cell 1 in the storage space 101b can be detected. For example, the infrared gas sensor 130 can be used to The concentration of volatile gases of organic solvents is detected.

Since the organic solvent component of the electrolyte is relatively unique, the infrared gas sensor 130 can be used to specifically identify the organic solvent component of the electrolyte. Specifically, organic solvents often have special groups that can absorb infrared light within a certain wavelength range, thereby generating an infrared absorption peak. For example, as shown in FIG4 , for lipid organic solvents, the lipid group (-COOR) can absorb infrared light within a wavelength range of 5.65 to 5.81 μm when irradiated with infrared light, thereby generating an infrared absorption peak within a wavelength range of 5.65 to 5.81 μm. For another example, for ether organic solvents, the ether group (R-O-R') can absorb infrared light within a wavelength range of 7.87 to 9.90 μm when irradiated with infrared light, thereby generating an infrared absorption peak within a wavelength range of 7.87 to 9.90 μm.

The infrared gas sensor 130 can be configured to identify the volatile gas of a specific organic solvent. For example, the infrared gas sensor 130 can be configured to specifically identify the volatile gas of a lipid organic solvent. For another example, the infrared gas sensor 130 can be configured to specifically identify the volatile gas of an ether organic solvent. The infrared gas sensor 130 can be used to obtain the infrared absorption peak of the volatile gas of the specific organic solvent, and further calculate the concentration of the volatile gas of the specific organic solvent based on the peak shape and intensity of the infrared absorption peak.

The leakage of electrolyte may cause problems such as short circuit of battery 100a and unstable operation of battery 100a. By setting up the infrared gas sensor 130 to detect the concentration of the volatile gas of the organic solvent of the electrolyte in the accommodating space 101b, the leakage of electrolyte can be detected in time when the electrolyte leaks to the outside of the battery cell 1, and the leakage of the volatile gas of the organic solvent can also be detected in time when the volatile gas of the organic solvent leaks to the outside of the battery cell 1, which is conducive to reducing the harm caused by the leakage of electrolyte.

According to some embodiments of the present application, optionally, the infrared gas sensor 130 is used to detect the gas volatilized by the organic solvent of the electrolyte within a first preset infrared wavelength range.

The infrared gas sensor 130 can detect the infrared absorption peak of the gas volatilized by the organic solvent of the electrolyte within the first preset infrared wavelength range. Specifically, the infrared gas sensor 130 can detect the gas volatilized by the organic solvent of the electrolyte using infrared light. The infrared gas sensor 130 can be configured to sense the absorption of infrared light within the first preset infrared wavelength range, so that the infrared gas sensor 130 can be used to detect the gas volatilized by the organic solvent in the accommodation space 101b.

By setting the infrared gas sensor 130 to detect the gas volatilized from the organic solvent of the electrolyte within the first preset infrared wavelength range, in the process of detecting the gas volatilized from the organic solvent of the electrolyte, the interference of the gas with the infrared absorption peak outside the first preset infrared wavelength range on the detection result can be reduced, thereby improving the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the first preset infrared wavelength range is 5-6 μm. For example, the first preset infrared wavelength range may include 5.1 μm, 5.2 μm, 5.3 μm, 5.5 μm or 5.9 μm.

The infrared gas sensor 130 can easily generate infrared light in this wavelength range, and the infrared light in this range is relatively stable, reliable, and not easily interfered with. The gas volatilized by the organic solvent can absorb infrared light in the wavelength range of 5 to 6 μm. The infrared gas sensor 130 can be configured to sense the absorption of infrared light in the wavelength range of 5 to 6 μm, so that the infrared gas sensor 130 can detect the gas volatilized by the organic solvent in the accommodating space 101b. If the lower limit value of the first preset infrared wavelength range is less than 5 μm, or the upper limit value of the first preset infrared wavelength range is greater than 6 μm, the gas with an infrared absorption peak outside the wavelength range of 5 to 6 μm will interfere with the detection result, which is not conducive to the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the first preset infrared wavelength range is 5.5-5.9 μm. For example, the first preset infrared wavelength range may include 5.6 μm, 5.7 μm or 5.8 μm.

The gas volatilized by the organic solvent can absorb infrared light in the wavelength range of 5.5 to 5.9 μm. The infrared gas sensor 130 can be configured to sense the absorption of infrared light in the wavelength range of 5.5 to 5.9 μm, so that the infrared gas sensor 130 can detect the gas volatilized by the organic solvent in the accommodating space 101b. If the lower limit value of the first preset infrared wavelength range is less than 5.5 μm, or the upper limit value of the first preset infrared wavelength range is greater than 5.9 μm, the gas with an infrared absorption peak outside the wavelength range of 5.5 to 5.9 μm will interfere with the detection result, which is not conducive to the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the organic solvent of the electrolyte includes at least one of dimethyl carbonate, propylene carbonate, diethyl carbonate and ethylene carbonate.

Dimethyl carbonate, propylene carbonate, diethyl carbonate and ethylene carbonate can be effectively detected by infrared gas sensor 130 The concentration is detected in response, so that the electrolyte leakage is detected in time. Specifically, dimethyl carbonate, propylene carbonate, diethyl carbonate and vinyl carbonate can be used to dissolve electrolyte salts. Dimethyl carbonate, propylene carbonate, diethyl carbonate and vinyl carbonate all contain lipid groups, so dimethyl carbonate, propylene carbonate, diethyl carbonate and vinyl carbonate can have infrared characteristic peaks of the same or similar wavelength range. The infrared gas sensor 130 can detect dimethyl carbonate, propylene carbonate, diethyl carbonate and vinyl carbonate by detecting lipid groups. As shown in Figure 4, dimethyl carbonate, propylene carbonate, diethyl carbonate and vinyl carbonate can have infrared characteristic peaks of similar wavelength ranges at 5.65 to 5.81 μm, so that they can be distinguished from methane, carbon monoxide and carbon dioxide.

According to some embodiments of the present application, optionally, as shown in Fig. 3, the battery cell 1 includes an electrode assembly 200 immersed in an electrolyte. The infrared gas sensor 130 is used to detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 within a second preset infrared wavelength range.

During the production, transportation and use of the battery 100a, the electrolyte and the electrode assembly 200 may react to generate gas. The gas generated by the reaction between the electrolyte and the electrode assembly 200 may absorb infrared light within a second preset infrared wavelength range. The infrared gas sensor 130 may use infrared light to detect the gas volatilized by the reaction between the electrolyte and the electrode assembly 200. Specifically, the infrared gas sensor 130 may be configured to sense the absorption of infrared light within a second preset infrared wavelength range, so that the infrared gas sensor 130 may be used to detect the gas volatilized by the reaction between the electrolyte and the electrode assembly 200.

By setting the infrared gas sensor 130 to detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 within the second preset infrared wavelength range, in the process of detecting the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200, the interference of the gas with the infrared absorption peak outside the second preset infrared wavelength range on the detection result can be reduced, thereby improving the accuracy and reliability of the detection result. The infrared gas sensor 130 can detect the gas related to the electrolyte from different preset infrared wavelength ranges, and can more effectively and timely detect the leakage of the electrolyte, thereby improving the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the second preset infrared wavelength range is 4-4.9 μm. For example, the second preset infrared wavelength range may include 4.1 μm, 4.2 μm, 4.3 μm, 4.5 μm, 4.7 μm or 4.8 μm.

The volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 can absorb infrared light in the wavelength range of 4 to 4.9 μm. The infrared gas sensor 130 can be configured to sense the absorption of infrared light in the wavelength range of 4 to 4.9 μm, so that the infrared gas sensor 130 can detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200. If the lower limit of the second preset infrared wavelength range is less than 4 μm, or the upper limit of the second preset infrared wavelength range is greater than 4.9 μm, the gas with an infrared absorption peak outside the wavelength range of 4 to 4.9 μm will interfere with the detection result, which is not conducive to the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the second preset infrared wavelength range is 4.2-4.7 μm. For example, the second preset infrared wavelength range may include 4.3 μm, 4.4 μm, 4.5 μm or 4.6 μm.

The volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 can absorb infrared light in the wavelength range of 4.2 to 4.7 μm. The infrared gas sensor 130 can be configured to sense the absorption of infrared light in the wavelength range of 4.2 to 4.7 μm, so that the infrared gas sensor 130 can detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200. If the lower limit of the second preset infrared wavelength range is less than 4.2 μm, or the upper limit of the second preset infrared wavelength range is greater than 4.7 μm, the gas with an infrared absorption peak outside the wavelength range of 4.2 to 4.7 μm will interfere with the detection result, which is not conducive to the accuracy and reliability of the detection result.

According to some embodiments of the present application, optionally, the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 includes at least one of carbon monoxide and carbon dioxide.

For example, the electrolyte reacts at the positive electrode to produce carbon dioxide and carbon monoxide.

When irradiated with infrared light, carbon monoxide can absorb infrared light with a wavelength of about 4.5 μm, thereby generating an infrared absorption peak at 4.5 μm. When irradiated with infrared light, carbon dioxide can absorb infrared light with a wavelength of about 4.3 μm, thereby generating an infrared absorption peak at 4.3 μm. The infrared gas sensor 130 can detect the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 by detecting the infrared absorption peak of at least one of carbon monoxide and carbon dioxide.

According to some embodiments of the present application, optionally, as shown in FIG5 , the infrared gas sensor 130 includes an infrared transmitting end 131, an infrared receiving end 132 and a filter 133. The filter 133 is disposed between the infrared transmitting end 131 and the infrared receiving end 132. The infrared emitting end 131 is used to emit infrared light to the space between the infrared emitting end 131 and the filter 133. The space between the infrared emitting end 131 and the filter 133 can be used to accommodate gas. The filter 133 is used to allow infrared light in a preset infrared wavelength range to pass through and enter the infrared receiving end 132.

The preset infrared wavelength range may refer to the first preset infrared wavelength range or the second preset infrared wavelength range. For example, the filter 133 is configured to allow infrared light in the first preset infrared wavelength range or the second preset infrared wavelength range to pass through and enter the infrared receiving end 132.

The wavelength range of the infrared light emitted by the infrared emitting end 131 includes a preset infrared wavelength range. The infrared light emitted by the infrared emitting end 131 in the preset infrared wavelength range can be absorbed by the gas whose infrared absorption peak is within the preset infrared wavelength range, and the filter 133 is configured to allow the infrared light within the preset infrared wavelength range to pass through but not allow the infrared light outside the preset infrared wavelength range to pass through. It can be determined whether there is a gas whose infrared absorption peak is within the preset infrared wavelength range in the space between the infrared emitting end 131 and the filter 133 based on whether the infrared receiving end 132 receives infrared light.

Specifically, if there is a gas with an infrared absorption peak within a preset infrared wavelength range in the space between the infrared emitting end 131 and the filter 133, the infrared light emitted by the infrared emitting end 131 is absorbed within the preset infrared wavelength range, while the infrared light outside the preset infrared wavelength range is intercepted by the filter 133, and the infrared receiving end 132 cannot receive the infrared light.

According to some embodiments of the present application, optionally, as shown in FIG5 , the infrared gas sensor 130 includes a cavity 136 having an optical cavity 134 and an air inlet 135, the infrared emitting end 131 is used to emit infrared light into the optical cavity 134, and the infrared receiving end 132 is used to receive the infrared light in the optical cavity 134 and passing through the filter 133. The air inlet 135 is used to guide the gas into the optical cavity 134.

By providing the optical cavity 134, the propagation path of the infrared light can be controlled, so as to facilitate sensing of the absorption of the infrared light. The optical cavity 134 can be located inside the cavity 136. The air inlet 135 can be provided through the cavity 136 and connected between the optical cavity 134 and the outside of the cavity 136, so that the air inlet 135 can guide the gas into the optical cavity 134.

In some embodiments, the propagation path of the infrared light may first pass through the gas and then pass through the optical filter 133. In other embodiments, the propagation path of the infrared light may first pass through the gas and then pass through the optical filter 133.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100a further includes a VOC sensor 140 , which is disposed in the accommodation space 101b and is used to detect the concentration of volatile organic compounds in the accommodation space 101b .

The accommodation space 101b may contain a variety of volatile organic compounds, and the VOC sensor 140 can detect a variety of volatile organic compounds. The volatile organic compounds in the accommodation space 101b may come from the electrolyte, or from other organic compounds on the outside of the battery cell 1 (such as structural adhesive or cable surface). When the electrolyte or the volatile gas of the electrolyte leaks from the inside of the battery cell 1, the concentration of the volatile organic compounds in the accommodation space 101b increases. The VOC sensor 140 can be used to preliminarily detect whether the electrolyte or the volatile gas of the electrolyte is leaking.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100 a includes a temperature sensor 150 , and the temperature sensor 150 is disposed in the accommodation space 101 b to detect the temperature of the battery cell 1 .

The increase in the temperature of the battery cell 1 will promote the volatilization of organic matter outside the battery cell 1, so that the volatile organic matter in the accommodation space 101b increases. When the VOC sensor 140 detects the increase of volatile organic matter in the accommodation space 101b, the cause of the increase of volatile organic matter in the accommodation space 101b can be analyzed according to the temperature of the battery cell 1, thereby improving the accuracy and reliability of the preliminary detection of whether the electrolyte or the volatile gas of the electrolyte is leaking.

On the basis of the infrared gas sensor 130 detecting the volatilized gas of the organic solvent of the electrolyte, the VOC sensor 140 can detect the volatile organic matter in the storage space 101b. By setting up multiple types of sensors, the various states of the battery 100a can be effectively monitored, and the state of the battery 100a can be more comprehensively understood. By detecting the volatile organic matter in the storage space 101b by the VOC sensor 140, the battery 100a can be monitored from another angle, so as to more effectively find the problems of the battery 100a, such as electrolyte leakage or possible thermal runaway. In addition, on the basis of the infrared gas sensor 130 detecting the volatilized gas of the organic solvent of the electrolyte, the temperature sensor 140 is added. Since the charging and discharging of the battery 100a often causes the temperature to rise and then causes various abnormalities, the state of the battery 100a can be further comprehensively judged from the perspective of temperature, thereby improving the reliability of monitoring the battery 100a.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100a further includes a hydrogen sensor 160, the hydrogen sensor 160 is disposed in the accommodating space 101b, and is used to detect the concentration of hydrogen in the accommodating space 101b.

During the production, transportation and use of the battery 100a, the battery cell 1 is at risk of damage or thermal runaway, causing the inside of the battery cell 1 to communicate with the outside of the battery cell 1, resulting in the risk of electrolyte leaking to the outside of the battery cell 1. When the inside of the battery cell 1 is connected to the outside of the battery cell 1, the hydrogen generated by the reaction inside the battery cell 1 can enter the outside of the battery cell 1 in the accommodation space 101b. For example, the hydrogen generated by the reaction of the electrolyte at the negative electrode can enter the outside of the battery cell 1 in the accommodation space 101b.

By providing the hydrogen sensor 160 to specifically detect the concentration of hydrogen in the accommodating space 101 b , the condition of the battery cell 1 can be detected in time when the battery cell 1 is damaged or thermally runaway, thereby helping to reduce the problems caused by the damage of the battery cell 1 .

According to some embodiments of the present application, optionally, the hydrogen sensor 160 includes at least one of a thermal conductivity hydrogen sensor and a palladium alloy hydrogen sensor.

The thermal conductivity type hydrogen sensor can detect the thermal conductivity of the gas, and can determine what kind of gas it is and the gas concentration based on the thermal conductivity of the gas. Specifically, the thermal conductivity type hydrogen sensor is provided with a thermistor, and the thermal conductivity of the gas in the environment where the thermistor is located will affect the temperature of the thermistor, thereby affecting the resistance of the thermistor. The thermal conductivity of the gas in the environment where the thermistor is located can be calculated by measuring the resistance value of the thermistor, and then the type of gas it is and the gas concentration can be determined based on the thermal conductivity of the gas.

The palladium alloy hydrogen sensor is equipped with a palladium alloy. Hydrogen can dissolve in the palladium alloy, causing the electrical parameters of the palladium alloy to change. The change in hydrogen concentration in the environment where the palladium alloy material is located will also affect the electrical parameters of the palladium alloy. Based on the electrical parameters of the palladium alloy, it is possible to determine what type of gas it is and the gas concentration.

By providing at least one of a thermal conductivity hydrogen sensor and a palladium alloy hydrogen sensor, the concentration of hydrogen in the accommodating space 101b can be specifically detected, and the condition of the battery cell 1 can be detected in time when the battery cell 1 is damaged or thermally runaway, thereby helping to reduce the problems caused by damage or thermal runaway of the battery cell 1.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100a further includes a laser gas sensor 170 , and the laser gas sensor 170 is disposed in the accommodating space 101b for detecting the concentration of methane in the accommodating space 101b .

During the production, transportation and use of the battery 100a, the battery cell 1 is at risk of damage or thermal runaway, causing the inside of the battery cell 1 to communicate with the outside of the battery cell 1, resulting in the risk of electrolyte leaking to the outside of the battery cell 1. When the inside of the battery cell 1 is connected to the outside of the battery cell 1, the methane generated by the reaction inside the battery cell 1 can enter the outside of the battery cell 1 in the accommodation space 101b. For example, the methane generated by the reaction of the electrolyte at the negative electrode can enter the outside of the battery cell 1 in the accommodation space 101b.

The laser gas sensor 170 can emit a laser of a specific wavelength (e.g., 1654nm or 1654nm), which can be absorbed by methane. The concentration of methane can be calculated based on the energy of the laser after being absorbed by methane. By setting the laser gas sensor 170, the concentration of methane in the accommodating space 101b can be specifically detected, and the condition of the battery cell 1 can be detected in time when the battery cell 1 is damaged, which is conducive to reducing the problems caused by damage or thermal runaway of the battery cell 1.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100 a includes a processor 180 , and the processor 180 is coupled to the infrared gas sensor 130 for acquiring the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor 130 .

By setting the processor 180 to couple to the infrared gas sensor 130, the processor 180 can process the information about the concentration of the volatile gas of the organic solvent of the electrolyte detected by the infrared gas sensor 130, and then can effectively detect whether there is a leakage of the electrolyte and whether it will cause other risks, which is convenient for formulating strategies according to the information on the concentration of the volatile gas of the organic solvent of the electrolyte, which is conducive to the realization of intelligence of the battery 100a.

Processor 180 may be an integrated circuit chip with signal processing capabilities. Processor 180 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. A general-purpose processor may be The microprocessor or the processor 180 may also be any conventional processor, etc. For example, the processor 180 is an MCU.

According to some embodiments of the present application, optionally, the processor 180 is used to determine whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to a first threshold and less than or equal to a second threshold. If it is greater than or equal to the first threshold and less than or equal to the second threshold, a first warning message is output; if it is greater than the second threshold, a second warning message different from the first warning message is output.

For example, for leakage and thermal runaway of battery cell 1, processor 180 can output different levels of warning information and take different countermeasures. For example, for leakage of battery cell 1, a first warning information of a lighter level can be output, and the working power of battery 100a can be reduced or battery 100a can be repaired and maintained. For thermal runaway of battery cell 1, a second warning information of a more serious level can be output, and the working circuit of battery 100a can be disconnected, battery 100a can be cooled, and inert gas can be filled.

Compared with the relatively slow gas leakage caused by the leakage of battery cell 1, the gas leakage during thermal runaway of battery cell 1 is more intense, causing the concentration of the gas volatilized by the organic solvent of the electrolyte to increase rapidly. If the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, it indicates that no leakage or thermal runaway has occurred. If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, it indicates that leakage has occurred. If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than the second threshold, it indicates that thermal runaway has occurred.

With such a setting, through the step-by-step judgment of different thresholds, the concentration of the volatile gas of the organic solvent in the electrolyte can be judged in a step-by-step manner, and then whether a leakage has occurred or has occurred can be classified in a step-by-step manner, which can more accurately and finely determine the problems of the battery 100a, thereby making subsequent response measures more reasonable and reliable.

According to some embodiments of the present application, optionally, the ratio of the second threshold to the first threshold is greater than or equal to 50. For example, the ratio of the second threshold to the first threshold may be set to 60, 80, 100, 200 or 500.

Setting such a ratio threshold can effectively distinguish the concentrations under different circumstances, and it is convenient to distinguish the situations corresponding to the concentrations under different thresholds, such as large leakage and mild leakage of electrolyte. If the ratio is too small, it is difficult to distinguish different situations. If the ratio is too large, it is not easy to sensitively understand the gas concentration. In addition, the setting of the above ratio is conducive to giving full play to the detection function of the infrared gas sensor 130, so that the battery 100a can detect the volatilized gas of the organic solvent of the electrolyte in a larger concentration range and formulate targeted countermeasures according to the detection results. If the ratio of the second threshold value to the first threshold value is less than 50, when the concentration of the volatilized gas of the organic solvent of the electrolyte is low or high, it is not conducive to formulating targeted countermeasures according to the concentration of the volatilized gas of the organic solvent of the electrolyte.

The situations when the volatilized gas of the organic solvent of the electrolyte leaks can be classified, and the problems of the battery 100a can be determined more accurately and finely, which is conducive to making the subsequent countermeasures more reasonable and reliable.

According to some embodiments of the present application, optionally, the battery cell 1 includes an electrode assembly 200 immersed in an electrolyte. The infrared gas sensor 130 is also used to detect the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200. The processor 180 is used to obtain the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 detected by the infrared gas sensor 130. The processor 180 is used to determine whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 is greater than or equal to a third threshold when the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold. If it is greater than or equal to the third threshold, a third warning message is output.

For example, during the production, transportation and use of the battery 100a, the battery cell 1 is at risk of dripping. Dripping refers to the slow seepage of electrolyte from the battery cell 1, and the speed of electrolyte outflow during dripping is slower than that of leakage. When the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, the battery cell 1 is at risk of dripping. The processor 180 can use the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 to determine whether the battery cell 1 is dripping.

Specifically, when the concentration of the volatilized gas of the organic solvent of the electrolyte is less than the first threshold, if the concentration of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 is greater than or equal to the third threshold, it indicates that the inside and outside of the battery cell 1 are connected, and there is a risk of dripping in the battery cell 1, and the processor 180 outputs the third warning information to prompt dripping. If the concentration of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 is less than the third threshold, it indicates that there is no risk of dripping in the battery cell 1, and the processor 180 does not output the third warning information.

In this way, when the concentration of the gas volatilized by the organic solvent in the electrolyte is less than the first threshold value, the gas cannot be detected. The leakage of electrolyte (either the leakage is not obvious, or the sensitivity of detection is not reached) is determined by judging whether the concentration of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 is greater than or equal to the third threshold value, and further detecting whether the electrolyte is leaking. By detecting whether the electrolyte is leaking from multiple angles, more status information of the battery 100a can be obtained, and a more comprehensive measurement of the battery 100a can be performed, which is conducive to improving the level of refinement of the management of the battery 100a.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6, the battery 100a further includes a VOC sensor 140, which is disposed in the accommodation space 101b and is used to detect the concentration of volatile organic compounds in the accommodation space 101b. The processor 180 is coupled to the VOC sensor 140 and is used to obtain the concentration of volatile organic compounds detected by the VOC sensor 140. The processor 180 is used to determine whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold when the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 is less than the third threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, a fourth warning message is output.

The volatile organic matter in the accommodation space 101b may include the volatilized gas from the organic solvent of the electrolyte inside the battery cell 1 and the volatilized gas from the reaction between the electrolyte and the electrode assembly 200, as well as the volatile matter from the organic matter outside the battery cell 1 (such as structural adhesive or cable skin). Among them, the components of the volatilized gas from the reaction between the electrolyte and the electrode assembly 200 and the components of the volatile matter from the organic matter outside the battery cell 1 may intersect. In other words, the same gas can exist in the volatilized gas from the reaction between the electrolyte and the electrode assembly 200, and in the organic matter outside the battery cell 1.

Therefore, when detecting the concentration of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200, the detection result is easily interfered by the volatile organic matter from the outside of the battery cell 1, resulting in inaccurate results. For example, if the concentration of the volatilized gas generated by the reaction between the electrolyte and the electrode assembly 200 is detected to be significantly increased, it may be caused by a large increase in the volatile organic matter outside the battery cell 1. The processor 180 can detect the volatile organic matter in the accommodation space 101b through the VOC sensor 140, thereby effectively monitoring various states of the battery 100a, more comprehensively understanding the state of the battery 100a, and more effectively discovering problems with the battery 100a, such as electrolyte leakage or possible thermal runaway. The processor 180 can also use the VOC sensor 140 to obtain the concentration of volatile organic compounds in the containing space 101b, and can determine whether the volatile organic compounds on the outside of the battery cell 1 have increased significantly. Therefore, when detecting the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200, the interference of the volatile organic compounds from the outside of the battery cell 1 on the detection results can be reduced, thereby improving the detection accuracy.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100a includes a temperature sensor 150, which is disposed in the accommodation space 101b and is used to detect the temperature of the battery cell 1. The processor 180 is coupled to the temperature sensor 150 and is used to obtain the temperature detected by the temperature sensor 150. The processor 180 is used to determine whether the temperature is greater than or equal to a preset temperature threshold when the concentration of the volatilized gas of the organic solvent of the electrolyte is less than the first threshold, and if it is greater than or equal to, output the fifth warning information.

The temperature of the battery cell 1 can reflect the working state of the battery cell 1. When the temperature of the battery cell 1 is greater than or equal to the preset temperature threshold, the processor 180 may consider that the risk of a problem with the operation of the battery cell 1 is increased. The processor 180 may output a fifth warning message of a lighter level to indicate that the risk of a problem with the operation of the battery cell 1 is increased, and reduce the working power of the battery 100a or perform maintenance on the battery 100a.

A temperature sensor 150 is added to the infrared gas sensor 130 to detect the volatilized gas of the organic solvent of the electrolyte. Since the charging and discharging of the battery 100a often causes the temperature to rise and thus causes various abnormalities, the processor 180 can further comprehensively judge the state of the battery 100a from the perspective of temperature, thereby improving the reliability of the monitoring of the battery 100a. This arrangement is conducive to quickly discovering and timely controlling the problems in the operation of the battery cell 1 when there are problems in the operation of the battery cell 1.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 6 , the battery 100a further includes a VOC sensor 140, which is disposed in the accommodation space 101b and is used to detect the concentration of volatile organic compounds in the accommodation space 101b. The processor 180 is coupled to the VOC sensor 140 and is used to obtain the concentration of volatile organic compounds detected by the VOC sensor 140. The processor 180 is used to determine whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold when the temperature is less than a preset temperature threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, a sixth warning message is output.

The higher the temperature, the more conducive it is to the volatilization of organic matter outside the battery cell 1, and the volatile organic matter in the accommodation space 101b When the temperature is lower than the preset temperature threshold, the organic matter outside the battery cell 1 evaporates less. If the volatile organic matter in the accommodation space 101b is greater than or equal to the fourth threshold at this time, it indicates that a large amount of gas comes from the inside of the battery cell 1, and the battery cell 1 is at risk of leakage. The sixth warning information can be used to indicate that the battery cell 1 is at risk of leakage.

Such an arrangement is helpful to reduce the harm caused by electrolyte leakage.

According to some embodiments of the present application, optionally, as shown in FIG2 and FIG3 , the battery cell 1 has a wall portion 101, and an explosion-proof valve 103 is disposed on the wall portion 101. The infrared gas sensor 130 is disposed on the housing 10a and is disposed opposite to the wall portion 101, or is disposed on the wall portion 101.

The wall portion 101 may be located on the end cover 120 , or on the bottom wall or side wall of the accommodating shell 110 .

When the pressure inside the battery cell 1 is high, the gas inside the battery cell 1 will break through the explosion-proof valve 103. By arranging the infrared gas sensor 130 on the housing 10a and opposite to the wall 101, or arranging it on the wall 101, the infrared gas sensor 130 can detect the gas overflowing from the explosion-proof valve 103 in time, which is conducive to realizing the rapid detection of the gas breaking through the explosion-proof valve 103 and reducing the risk caused by thermal runaway of the battery cell 1.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 3 , the battery 100a includes a circuit board 300, and the infrared gas sensor 130 is disposed on the circuit board 300. The housing 10a includes a top 104, a bottom 105, and a side 106 connected between the top 104 and the bottom 105. The top 104, the bottom 105, and the side 106 are collectively enclosed to form a receiving space 101b. The battery cell 1 has a wall 101, and the wall 101 is provided with an explosion-proof valve 103. The top 104 is arranged opposite to the wall 101. The circuit board 300 is arranged at the top 104, the wall 101, or between the top 104 and the wall 101.

When the pressure inside the battery cell 1 is high, the gas inside the battery cell 1 will break through the explosion-proof valve 103. By arranging the circuit board 300 at the top 104, the wall 101, or between the top 104 and the wall 101, the infrared gas sensor 130 can detect the gas overflowing from the explosion-proof valve 103 in time, which is conducive to the rapid detection of the gas breaking through the explosion-proof valve 103 and reducing the risk caused by thermal runaway of the battery cell 1.

According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 3 , the circuit board 300 is electrically connected to the battery cell 1 through the lead 301 so as to supply power to the circuit board 300 through the battery cell 1 .

With such a configuration, the lead wire 301 can be arranged inside the housing 10a, which simplifies the circuit connection of the battery 100a and makes the circuit connection more stable, thereby improving the working stability of the battery 100a.

According to some embodiments of the present application, optionally, as shown in FIGS. 2 to 6 , the battery 100a includes a housing 10a, a battery cell 1 and an infrared gas sensor 130. The housing 10a has a housing space 101b. The battery cell 1 has an electrolyte inside and is contained in the housing space 101b. The infrared gas sensor 130 is disposed in the housing space 101b and is located outside the battery cell 1. The infrared gas sensor 130 is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte in the housing space 101b. The infrared gas sensor 130 is used to detect the gas volatilized by the organic solvent of the electrolyte within the first preset infrared wavelength range. The first preset infrared wavelength range is 5 to 6 μm, or the first preset infrared wavelength range is 5.5 to 5.9 μm. The organic solvent of the electrolyte includes at least one of dimethyl carbonate, propylene carbonate, diethyl carbonate and ethylene carbonate. The battery cell 1 includes an electrode assembly 200 immersed in the electrolyte. The infrared gas sensor 130 is used to detect the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 within a second preset infrared wavelength range. The second preset infrared wavelength range is 4 to 4.9 μm, or the second preset infrared wavelength range is 4.2 to 4.7 μm. The gas volatilized by the reaction between the electrolyte and the electrode assembly 200 includes at least one of carbon monoxide and carbon dioxide. The infrared gas sensor 130 includes an infrared emitting end 131, an infrared receiving end 132 and a filter 133. The filter 133 is arranged between the infrared emitting end 131 and the infrared receiving end 132. The infrared emitting end 131 is used to emit infrared light to the space between the infrared emitting end 131 and the filter 133. The space between the infrared emitting end 131 and the filter 133 can be used to accommodate gas. The filter 133 is used to allow infrared light in a preset infrared wavelength range to pass through and enter the infrared receiving end 132. The infrared gas sensor 130 includes a cavity 136 having an optical cavity 134 and an air inlet 135. The infrared emitting end 131 is used to emit infrared light into the optical cavity 134. The infrared receiving end 132 is used to receive the infrared light in the optical cavity 134 and passing through the filter 133. The air inlet 135 is used to guide the gas into the optical cavity 134. The battery 100a also includes a VOC sensor 140, which is disposed in the accommodation space 101b and is used to detect the concentration of volatile organic compounds in the accommodation space 101b. And/or, the battery 100a includes a temperature sensor 150, which is disposed in the accommodation space 101b and is used to detect the temperature of the battery cell 1. The battery 100a also includes a hydrogen sensor 160, which is disposed in the accommodation space 101b and is used to detect the concentration of hydrogen in the accommodation space 101b. The hydrogen sensor 160 includes a thermal conductivity sensor. At least one of a hydrogen sensor and a palladium alloy hydrogen sensor. The battery 100a also includes a laser gas sensor 170, which is arranged in the accommodating space 101b and is used to detect the concentration of methane in the accommodating space 101b. The battery 100a includes a processor 180, which is coupled to the infrared gas sensor 130 and is used to obtain the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor 130. The processor 180 is used to determine whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold. If it is greater than or equal to the first threshold and less than or equal to the second threshold, a first warning message is output, and if it is greater than the second threshold, a second warning message different from the first warning message is output. The ratio of the second threshold to the first threshold is greater than or equal to 50. The infrared gas sensor 130 is also used to detect the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200. The processor 180 is used to obtain the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 detected by the infrared gas sensor 130. The processor 180 is used to determine whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 is greater than or equal to the third threshold when the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold. If it is greater than or equal to the third threshold, the third warning information is output. The battery 100a also includes a VOC sensor 140, which is arranged in the accommodation space 101b and is used to detect the concentration of volatile organic matter in the accommodation space 101b. The processor 180 is coupled to the VOC sensor 140 to obtain the concentration of volatile organic matter detected by the VOC sensor 140. The processor 180 is used to determine whether the concentration of volatile organic matter is greater than or equal to the fourth threshold when the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly 200 is less than the third threshold. If the concentration of volatile organic matter is greater than or equal to the fourth threshold, the fourth warning information is output. The battery 100a includes a temperature sensor 150, which is disposed in the accommodation space 101b and is used to detect the temperature of the battery cell 1. The processor 180 is coupled to the temperature sensor 150 and is used to obtain the temperature detected by the temperature sensor 150. The processor 180 is used to determine whether the temperature is greater than or equal to the preset temperature threshold when the concentration of the volatilized gas of the organic solvent of the electrolyte is less than the first threshold, and if it is greater than or equal to, output the fifth warning information. The battery 100a also includes a VOC sensor 140, which is disposed in the accommodation space 101b and is used to detect the concentration of volatile organic compounds in the accommodation space 101b. The processor 180 is coupled to the VOC sensor 140 and is used to obtain the concentration of volatile organic compounds detected by the VOC sensor 140. The processor 180 is used to determine whether the concentration of volatile organic compounds is greater than or equal to the fourth threshold when the temperature is less than the preset temperature threshold. If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, the sixth warning information is output. The battery cell 1 has a wall 101, and an explosion-proof valve 103 is arranged on the wall 101. Among them, the infrared gas sensor 130 is arranged on the housing 10a, and is arranged opposite to the wall 101, or is arranged on the wall 101. The battery 100a includes a circuit board 300, and the infrared gas sensor 130 is arranged on the circuit board 300. The housing 10a includes a top 104, a bottom 105, and a side 106 connected between the top 104 and the bottom 105. The top 104, the bottom 105 and the side 106 are collectively enclosed to form a receiving space 101b. The battery cell 1 has a wall 101, and an explosion-proof valve 103 is arranged on the wall 101. The top 104 is arranged opposite to the wall 101. The circuit board 300 is arranged at the top 104, the wall 101, or between the top 104 and the wall 101. The circuit board 300 is electrically connected to the battery cell 1 through the lead 301 to power the circuit board 300 through the battery cell 1.

According to some embodiments of the present application, as shown in Figure 1, the electric device includes the above-mentioned battery 100a. In this way, the working state of the electric device can be reasonably adjusted according to the detected working state of the battery 100a, so that the working state of the electric device matches the working state of the battery 100a, thereby improving the working stability of the electric device.

According to some embodiments of the present application, as shown in Fig. 7, the gas concentration detection method includes: S100: detecting the concentration of the gas volatilized by the organic solvent of the electrolyte by an infrared gas sensor. S200: acquiring the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor.

According to some embodiments of the present application, optionally, after obtaining the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor, please refer to the following steps included after step S200:

S210: Determine whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to a first threshold and less than or equal to a second threshold.

S220: If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, output a first warning message.

S230: If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than a second threshold, output a second warning message different from the first warning message.

According to some embodiments of the present application, optionally, when judging whether the concentration of the volatilized gas of the organic solvent in the electrolyte is large After the value is equal to or greater than the first threshold and less than or equal to the second threshold, please refer to the following steps after step S210:

S211: If the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly detected by the infrared gas sensor is obtained, and it is determined whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold.

S212: If the volatilized gas generated by the reaction between the electrolyte and the electrode assembly is greater than or equal to a third threshold, a third warning message is output.

According to some embodiments of the present application, optionally, after determining whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold, please refer to the following steps included after step S212:

S213: If the volatilized gas generated by the reaction between the electrolyte and the electrode assembly is less than the third threshold, the concentration of volatile organic compounds detected by the VOC sensor is obtained, and it is determined whether the concentration of the volatile organic compounds is greater than or equal to a fourth threshold.

S214: If the concentration of volatile organic compounds is greater than or equal to a fourth threshold, output a fourth warning message.

According to some embodiments of the present application, optionally, after determining whether the concentration of the volatilized gas of the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, please refer to the following steps included after step S220:

S215: If the concentration of the volatilized gas of the organic solvent of the electrolyte is less than the first threshold, the temperature of the battery cell detected by the temperature sensor is obtained, and it is determined whether the temperature of the battery cell is greater than or equal to a preset temperature threshold.

S216: If the temperature of the battery cell is greater than or equal to the preset temperature threshold, output a fifth warning message.

According to some embodiments of the present application, optionally, after determining whether the temperature of the battery cell is greater than or equal to a preset temperature threshold, please refer to the following steps included after step S216:

S217: If the temperature of the battery cell is lower than the preset temperature threshold, the concentration of volatile organic compounds detected by the VOC sensor is obtained, and when the temperature of the battery cell is lower than the preset temperature threshold, whether the concentration of volatile organic compounds is greater than or equal to a fourth threshold is determined.

S218: If the concentration of volatile organic compounds is greater than or equal to the fourth threshold, output a sixth warning message.

Regarding the contents of the gas concentration detection method embodiment of the present application, reference can be made to the relevant description of the above-mentioned battery embodiment, which will not be repeated here.

In summary, the embodiments of the present application can detect whether the organic solvent of the electrolyte is leaking and the concentration, which is conducive to quickly and accurately judging the working status of the battery, so as to provide targeted countermeasures when problems occur in the battery.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims (32)

A battery, comprising: A housing having a receiving space; A battery cell having an electrolyte inside and contained in the containing space; The infrared gas sensor is arranged in the accommodation space and located outside the battery cell; the infrared gas sensor is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte in the accommodation space. The battery according to claim 1, characterized in that The infrared gas sensor is used to detect the gas volatilized from the organic solvent of the electrolyte within a first preset infrared wavelength range. The battery according to claim 2, characterized in that The first preset infrared wavelength range is 5-6 μm. The battery according to claim 2, characterized in that The first preset infrared wavelength range is 5.5-5.9 μm. The battery according to any one of claims 2 to 4, characterized in that The organic solvent of the electrolyte includes at least one of dimethyl carbonate, propylene carbonate, diethyl carbonate and ethylene carbonate. The battery according to any one of claims 1 to 5, characterized in that The battery cell comprises an electrode assembly immersed in the electrolyte; the infrared gas sensor is used to detect the volatilized gas generated by the reaction between the electrolyte and the electrode assembly within a second preset infrared wavelength range. The battery according to claim 6, characterized in that The second preset infrared wavelength range is 4-4.9 μm. The battery according to claim 7, characterized in that The second preset infrared wavelength range is 4.2-4.7 μm. The battery according to any one of claims 6 to 8, characterized in that The gas volatilized by the reaction between the electrolyte and the electrode assembly includes at least one of carbon monoxide and carbon dioxide. The battery according to any one of claims 1 to 9, characterized in that The infrared gas sensor includes an infrared emitting end, an infrared receiving end and a filter; the filter is arranged between the infrared emitting end and the infrared receiving end; the infrared emitting end is used to emit infrared light to the space between the infrared emitting end and the filter; the space between the infrared emitting end and the filter can be used to accommodate gas; the filter is used to allow infrared light in a preset infrared wavelength range to pass through and enter the infrared receiving end. The battery according to claim 10, characterized in that The infrared gas sensor comprises a cavity having an optical cavity and an air inlet, the infrared emitting end is used to emit infrared light into the optical cavity, the infrared receiving end is used to receive the infrared light in the optical cavity and passing through the filter; the air inlet is used to guide the gas into the optical cavity. The battery according to any one of claims 1 to 11, characterized in that The battery further includes a VOC sensor, which is disposed in the accommodation space and is used to detect the concentration of volatile organic compounds in the accommodation space; and/or, The battery includes a temperature sensor, which is disposed in the accommodation space and is used to detect the temperature of the battery cell. The battery according to any one of claims 1 to 12, characterized in that The battery further comprises a hydrogen sensor, which is disposed in the accommodation space and is used to detect the concentration of hydrogen in the accommodation space. The battery according to claim 13, characterized in that The hydrogen sensor includes at least one of a thermal conductivity hydrogen sensor and a palladium alloy hydrogen sensor. The battery according to any one of claims 1 to 14, characterized in that The battery further comprises a laser gas sensor, which is arranged in the accommodation space and is used for detecting the concentration of methane in the accommodation space. The battery according to any one of claims 1 to 15, characterized in that The battery includes a processor, which is coupled to the infrared gas sensor and is used to obtain the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor. The battery according to claim 16, characterized in that The processor is used to determine whether the concentration of the volatilized gas of the organic solvent of the electrolyte is greater than or equal to a first threshold and less than or equal to a second threshold; if it is greater than or equal to the first threshold and less than or equal to the second threshold, a first warning message is output; if it is greater than the second threshold, a second warning message different from the first warning message is output. The battery according to claim 17, characterized in that A ratio of the second threshold to the first threshold is greater than or equal to 50. The battery according to claim 17 or 18, characterized in that The battery cell includes an electrode assembly immersed in the electrolyte; the infrared gas sensor is also used to detect the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly; the processor is used to obtain the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly detected by the infrared gas sensor; The processor is used to determine whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to a third threshold when the concentration of the gas volatilized by the organic solvent in the electrolyte is less than the first threshold; if it is greater than or equal to the third threshold, output a third warning message. The battery according to claim 19, characterized in that The battery further includes a VOC sensor, which is disposed in the accommodation space and is used to detect the concentration of volatile organic compounds in the accommodation space; The processor is coupled to the VOC sensor and is used to obtain the concentration of the volatile organic compound detected by the VOC sensor; the processor is used to determine whether the concentration of the volatile organic compound is greater than or equal to a fourth threshold when the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is less than the third threshold; if the concentration of the volatile organic compound is greater than or equal to the fourth threshold, output a fourth warning message. The battery according to any one of claims 17 to 20, characterized in that The battery includes a temperature sensor, which is disposed in the accommodation space and is used to detect the temperature of the battery cell; the processor is coupled to the temperature sensor and is used to obtain the temperature detected by the temperature sensor; The processor is used to determine whether the temperature is greater than or equal to a preset temperature threshold when the concentration of the volatilized gas of the organic solvent in the electrolyte is less than the first threshold, and if so, output a fifth warning message. The battery according to claim 21, characterized in that The battery further includes a VOC sensor, which is disposed in the accommodation space and is used to detect the concentration of volatile organic compounds in the accommodation space; The processor is coupled to the VOC sensor and is used to obtain the VOC detected by the VOC sensor. The concentration of volatile organic compounds; the processor is used to determine whether the concentration of the volatile organic compounds is greater than or equal to a fourth threshold when the temperature is less than the preset temperature threshold; if the concentration of the volatile organic compounds is greater than or equal to the fourth threshold, a sixth warning message is output. The battery according to any one of claims 1 to 22, characterized in that The battery cell has a wall portion, and an explosion-proof valve is arranged on the wall portion; Wherein, the infrared gas sensor is arranged on the shell and is arranged opposite to the wall portion; or is arranged on the wall portion. The battery according to any one of claims 1 to 23, characterized in that The battery includes a circuit board, and the infrared gas sensor is arranged on the circuit board; the shell includes a top, a bottom and a side connected between the top and the bottom; the top, the bottom and the side are jointly enclosed to form the accommodating space; the battery cell has a wall, and the wall is provided with an explosion-proof valve; the top is arranged opposite to the wall; the circuit board is arranged at the top, the wall or between the top and the wall. The battery according to claim 24, characterized in that The circuit board is electrically connected to the battery cell through a lead wire so that the battery cell supplies power to the circuit board. An electrical device, characterized in that it comprises a battery as described in any one of claims 1-25. A gas concentration detection method, characterized in that it is applied to a battery according to any one of claims 1 to 25, and the method comprises: The infrared gas sensor is used to detect the concentration of the gas volatilized by the organic solvent of the electrolyte; The concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor is obtained. The method according to claim 27, characterized in that After acquiring the concentration of the gas volatilized by the organic solvent of the electrolyte detected by the infrared gas sensor, the method further comprises: Determining whether the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than or equal to a first threshold and less than or equal to a second threshold; If the concentration of the volatilized gas of the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, outputting a first warning message; If the concentration of the gas volatilized by the organic solvent of the electrolyte is greater than the second threshold, a second warning information different from the first warning information is output. The method according to claim 28, characterized in that After determining whether the concentration of the volatilized gas of the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, the method further comprises: If the concentration of the gas volatilized by the organic solvent of the electrolyte is less than the first threshold, the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly detected by the infrared gas sensor is obtained, and it is determined whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to a third threshold; If the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to the third threshold, a third warning message is output. The method according to claim 29, characterized in that After determining whether the concentration of the gas volatilized by the reaction between the electrolyte and the electrode assembly is greater than or equal to a third threshold, the method further comprises: If the gas volatilized by the reaction between the electrolyte and the electrode assembly is less than the third threshold, the concentration of volatile organic compounds detected by the VOC sensor is obtained, and it is determined whether the concentration of the volatile organic compounds is greater than or equal to a fourth threshold; If the concentration of the volatile organic compounds is greater than or equal to the fourth threshold, a fourth warning message is output. The method according to any one of claims 28 to 30, characterized in that After determining whether the concentration of the volatilized gas of the organic solvent of the electrolyte is greater than or equal to the first threshold and less than or equal to the second threshold, the method further comprises: If the concentration of the volatilized gas of the organic solvent of the electrolyte is less than the first threshold, obtaining the temperature of the battery cell detected by the temperature sensor, and determining whether the temperature of the battery cell is greater than or equal to a preset temperature threshold; If the temperature of the battery cell is greater than or equal to the preset temperature threshold, a fifth warning message is output. The method according to claim 31, characterized in that After determining whether the temperature of the battery cell is greater than or equal to a preset temperature threshold, the method further includes: If the temperature of the battery cell is lower than the preset temperature threshold, the concentration of volatile organic compounds detected by the VOC sensor is obtained, and when the temperature of the battery cell is lower than the preset temperature threshold, whether the concentration of the volatile organic compounds is greater than or equal to a fourth threshold is determined; If the concentration of the volatile organic compounds is greater than or equal to the fourth threshold, a sixth warning message is output.