CN117565678A

CN117565678A - Energy storage device, control method of energy storage device and power utilization device

Info

Publication number: CN117565678A
Application number: CN202410051496.9A
Authority: CN
Inventors: 吴少基; 石俊朝; 王灿; 沈聃
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-01-15
Filing date: 2024-01-15
Publication date: 2024-02-20

Abstract

The application discloses an energy storage device, a control method of the energy storage device and an electricity utilization device, wherein the energy storage device comprises a battery, a positive end of the energy storage device, a negative end of the energy storage device and an on-off device; under the condition that the state of the battery is normal, the energy storage device supplies power to the power utilization device through a first loop, wherein the first loop comprises a positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery and a negative end of the battery; under the abnormal condition of the battery, the on-off device is in a conducting state, the energy storage device provides power for the power utilization device through a second loop, and the second loop comprises an positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery, a negative end of the battery and the on-off device. When the energy storage device is used on the whole vehicle, the energy storage device can still supply power to the whole vehicle through the second loop under the condition of abnormal state of the battery, so that the probability of traffic accidents caused by power loss of the whole vehicle is reduced.

Description

Energy storage device, control method of energy storage device and power utilization device

Technical Field

The application relates to the field of batteries, in particular to an energy storage device, a control method of the energy storage device and an electric device.

Background

As new energy power batteries are increasingly widely applied in the fields of automobiles, ships, aerospace and the like, the power supply reliability of the power batteries is increasingly emphasized.

For example, in an electric vehicle, a high-voltage power supply circuit is formed in a power battery when the electric vehicle is supplied with power, and when the power battery is abnormal, the high-voltage power supply circuit is disconnected, and the power battery stops supplying power, so that it is desired to avoid further safety accidents due to deterioration of the battery state. However, based on practical considerations, for example, when the electric vehicle is running at a high speed, the power battery thereof stops supplying power due to the abnormality, the electric vehicle will immediately lose power, and a more serious traffic accident may occur.

The statements are to be understood as merely provide background information related to the present application and may not necessarily constitute prior art.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide an energy storage device, a control method of the energy storage device, and an electric device, so as to reduce potential safety hazards caused by stopping power supply of a battery under abnormal conditions.

In a first aspect, the present application provides an energy storage device comprising:

a battery, a positive terminal of the energy storage device, a negative terminal of the energy storage device, and an on-off device;

Under the condition that the state of the battery is normal, the energy storage device provides power for the power utilization device through a first loop, wherein the first loop comprises a positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery and a negative end of the battery;

under the condition that the state of the battery is abnormal, the on-off device is in a conducting state, the energy storage device provides power for the power utilization device through a second loop, the second loop comprises a positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery, a negative end of the battery and the on-off device;

and under the conditions of normal state and abnormal state, the energy storage device supplies power for the power utilization device through the same battery.

In the scheme provided by the embodiment, because the energy storage device can provide power for the power utilization device through the second loop under the condition that the state of the battery is abnormal, when the energy storage device is used on the whole vehicle, the energy storage device can still supply power to the whole vehicle through the second loop under the condition that the state of the battery is abnormal, so that the probability of traffic accidents caused by power loss of the whole vehicle is reduced.

In some embodiments, the energy storage device further comprises:

switching means belonging to said first circuit;

in the case where the state of the battery is normal, the switching device is in an on state.

According to the scheme provided by the embodiment, the switching device is designed in the first loop, so that the power supply reliability of the energy storage device is improved or the power consumption of the first loop is reduced.

In some embodiments, the switching device comprises:

a first switching sub-means and a second switching sub-means;

the first switch sub-device is respectively connected with the positive electrode terminal of the energy storage device and the positive electrode terminal of the battery, and the second switch sub-device is respectively connected with the negative electrode terminal of the energy storage device and the negative electrode terminal of the battery.

In the scheme provided by the embodiment, the switching device is realized by the first switching sub-device and the second switching sub-device, so that the reliability of the on-off of the first loop is improved.

In some embodiments, the switching device is connected in parallel with the on-off device.

In the scheme provided by the embodiment, the switch device and the on-off device are connected in parallel, so that the operation of connecting the switch device into the energy storage device is simplified.

In some embodiments, the on-off device comprises:

A first on-off sub-device and a second on-off sub-device;

the first on-off sub-device is respectively connected with the positive electrode end of the energy storage device and the positive electrode end of the battery, and the second on-off sub-device is respectively connected with the negative electrode end of the energy storage device and the negative electrode end of the battery.

In the scheme provided by the embodiment, the on-off device is realized by the first on-off sub device and the second on-off sub device, so that the reliability of the on-off of the second loop is improved.

In some embodiments, the on-off device comprises:

a thermistor;

the conduction temperature of the thermistor is greater than the upper limit of the tolerance temperature of the battery.

In the technical scheme provided by the embodiment, the on-off device is realized by adopting the thermistor, which is beneficial to simplifying the structure of the energy storage device.

In some embodiments, the on-off device comprises:

the device comprises a shell, a first electric connector, a second electric connector and a mobile device;

the mobile device is arranged in the shell and divides a closed space formed by the shell into at least two cavities; the moving device can move along the inner wall of the shell;

the first connecting end of the first electric connector and the second connecting end of the second electric connector are arranged in the same cavity of the at least two cavities; the third connecting end of the first electric connector is connected with the energy storage device, and the fourth connecting end of the second electric connector is connected with the battery;

And under the condition that the mobile device is contacted with the first connecting end and the second connecting end, the on-off device is in a conducting state.

In the technical scheme provided by the embodiment, the on-off device comprising the first electric connector, the second electric connector and the mobile device is designed, and the on-off device is simple in component parts and low in manufacturing cost, and is beneficial to reducing the cost of the energy storage device.

In some embodiments, the mobile device comprises:

the first movable plate and the air holes are formed in the residual cavities, and the residual cavities are cavities in which the first connecting end and the second connecting end are not placed in the at least two cavities.

In the scheme provided by the embodiment, the ventilation holes are formed in the residual cavity, so that the on-off device is automatically conducted based on the change of air pressure under the condition that the battery is in thermal runaway.

In some embodiments, the mobile device comprises:

a first movable plate;

and the residual cavity is a cavity in which the first connecting end and the second connecting end are not arranged in the at least two cavities.

In the scheme provided by the embodiment, the thermal expansion material is placed in the residual cavity, so that the on-off device is automatically conducted based on the change of temperature under the condition that the battery is in thermal runaway.

In some embodiments, the first electrical connector is disposed perpendicular to the first movable plate and the second electrical connector is disposed perpendicular to the first movable plate;

the first movable plate includes:

a conductive plate and an insulating plate carrying the conductive plate;

the conductive plate is carried on one side of the insulating plate, which is close to the first connecting end and the second connecting end.

In the scheme provided by the embodiment, the first electric connector, the second electric connector and the first movable plate are arranged in a vertical layout mode, and the scheme is simple and easy to realize.

In some embodiments, the mobile device further comprises:

a second movable plate;

the first movable plate, the second movable plate, the first electrical connector and the second electrical connector are arranged in parallel with each other; the first movable plate is connected with the first electric connector, and the second movable plate is connected with the second electric connector; the first movable plate, the second movable plate and the cavity of the housing enclosure are provided with the first connecting end and the second connecting end.

In the scheme provided by the embodiment, the first electric connector, the second electric connector, the first movable plate and the second movable plate are arranged in a parallel layout mode, and the scheme is simple and easy to realize.

In some embodiments, further comprising:

the control device is respectively connected with the battery and the on-off device;

the control device is used for controlling the on-off device to be conducted under the condition that the state of the battery is determined to be abnormal.

In the scheme provided by the embodiment, the on-off device is controlled to be conducted by the control device, so that the reliability of the action of the on-off device is improved.

In a second aspect, the present application provides a control method of an energy storage device, applied to an energy storage device including a control device in the first aspect, the method including:

acquiring an electrical parameter used for representing the state of the battery;

and controlling the on-off device to be conducted under the condition that the state of the battery meets the preset abnormal condition based on the electrical parameter.

In the scheme provided by the embodiment, the control device judges whether the state of the battery is abnormal based on the electrical parameters, and the control device controls the on-off device to be conducted, so that the reliability of the on-off device is improved.

In some embodiments, further comprising:

and controlling the on-off device to be turned off under the condition that the state of the battery is determined to be switched from meeting the preset abnormal condition to meeting the preset normal condition based on the electrical parameter.

In the scheme provided by the embodiment, when the state of the battery is switched from meeting the preset abnormal condition to meeting the preset normal condition, the on-off device is controlled to be turned off, so that the follow-up safe fire protection of the battery is facilitated.

In some embodiments, determining, based on the electrical parameter, that the state of the battery is switched from meeting the preset abnormal condition to meeting a preset normal condition includes:

and under the condition that the electrical parameter represents that the external load of the battery meets the power consumption stop condition, determining that the state of the battery is switched from meeting the preset abnormal condition to meeting the preset normal condition.

In the scheme provided by the embodiment, under the condition that the external load meets the power consumption stopping condition, the state of the battery is determined to meet the preset normal condition, so that the battery can be treated later.

In a third aspect, the present application provides an electrical device, characterized in that the electrical device comprises an energy storage device according to the first aspect.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 2 is a schematic diagram of an energy storage device according to some embodiments of the present application;

FIG. 3 (a) is a cross-sectional view of an on-off device according to some embodiments of the present application;

FIG. 3 (b) is a top view of an on-off device according to some embodiments of the present application;

FIG. 4 is a cross-sectional view of an on-off device according to some embodiments of the present application;

FIG. 5 (a) is a cross-sectional view of an on-off device according to some embodiments of the present application;

FIG. 5 (b) is a top view of an on-off device according to some embodiments of the present application;

FIG. 6 is a cross-sectional view of an on-off device according to some embodiments of the present application;

FIG. 7 is a schematic structural diagram of an electrical device according to some embodiments of the present application;

FIG. 8 is a flow chart of a method of controlling an energy storage device according to some embodiments of the present disclosure;

FIG. 9 is a schematic structural diagram of a control device of an energy storage device according to some embodiments of the present application;

FIG. 10 is a schematic structural diagram of an electrical device according to some embodiments of the present application;

fig. 11 is a schematic structural diagram of a computer-readable storage medium according to some embodiments of the present application.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate 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 merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In order to solve the problem that serious traffic accidents may occur to the whole vehicle due to the fact that a power battery stops supplying power when the battery is abnormal in the related art, the embodiment of the application provides an energy storage device, a control method of the energy storage device and an electricity utilization device. The energy storage device comprises a battery, an energy storage device positive end, an energy storage device negative end and an on-off device; under the condition that the state of the battery is normal, the energy storage device supplies power to the power utilization device through a first loop, wherein the first loop comprises a positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery and a negative end of the battery; under the abnormal condition of the battery, the on-off device is in a conducting state, the energy storage device provides power for the power utilization device through a second loop, and the second loop comprises a positive end of the energy storage device, a negative end of the energy storage device, a positive end of the battery, a negative end of the battery and the on-off device. Because the energy storage device can provide power for the power utilization device through the second loop under the condition that the state of the battery is abnormal, when the energy storage device is used on the whole vehicle, the energy storage device can still supply power to the whole vehicle through the second loop under the condition that the state of the battery is abnormal, so that the probability of traffic accidents caused by power loss of the whole vehicle is reduced.

The energy storage device disclosed by the embodiment of the application comprises, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system with the energy storage device disclosed by the application can be used for forming the power utilization device, so that the problem that the power utilization device is in a power loss state when the battery is stopped to supply power to cause safety accidents is solved.

The embodiment of the application provides an electricity utilization device using an energy storage device as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

In one or more embodiments of the present application, as shown in fig. 2, the energy storage device may include:

a battery 21, an energy storage device positive terminal 22, an energy storage device negative terminal 23, and an on-off device 24;

in the case where the state of the battery 21 is normal, the energy storage device supplies power to the power utilization device through a first circuit including an energy storage device positive terminal 22, an energy storage device negative terminal 23, a positive terminal of the battery 21, and a negative terminal of the battery 21;

in the case of abnormal state of the battery 21, the on-off device 24 is in a conductive state, and the energy storage device supplies power to the power utilization device through a second loop, wherein the second loop comprises an energy storage device positive electrode 22, an energy storage device negative electrode 23, a positive electrode of the battery 21, a negative electrode of the battery 21, and the on-off device 24;

the energy storage device supplies power to the power utilization device through the same battery 21 under the conditions of normal state and abnormal state.

In this embodiment, the battery 21 is a component of an energy storage device, and the energy storage device further includes a positive electrode 22, a negative electrode 23 and an on-off device 24. The positive terminal of the battery 21 is connected to the positive energy storage device terminal 22, the negative terminal of the battery 21 is connected to the negative energy storage device terminal 23, and the positive energy storage device terminal 22 and the negative energy storage device terminal 23 are connected to the electrical device, thus forming a first circuit. The connection between the positive terminal of the battery 21 and the positive terminal 22 of the energy storage device may be connected in parallel with the on-off device 24 and/or the connection between the negative terminal of the battery 21 and the negative terminal 23 of the energy storage device may be connected in parallel with the on-off device 24, so that a second circuit different from the first circuit can be formed.

In some embodiments of the present application, the battery 21 may include, but is not limited to, a battery module or a battery pack, etc., and a plurality of battery cells may be included in the battery 21. The abnormal state of the battery 21 may include, but is not limited to, unstable voltage of the battery 21, or an excessively high temperature thermal imbalance or thermal runaway problem of individual cells in the battery 21, or a short circuit or other electrical failure of individual cells in the battery 21, etc. It should be understood that, in the case of abnormal state of the battery 21, parameters such as temperature and current of the battery 21 may be changed, and if the state of the battery 21 is abnormal due to thermal runaway of the battery 21, high-pressure gas may be generated in the battery 21 due to the thermal runaway, so that the gas pressure in the energy storage device may be changed. When the battery 21 is in such abnormal state, external power supply is still possible, but the degree of abnormality may be increased by external power supply, and when the battery 21 is in abnormal state, the possibility of occurrence of an accident due to abnormal state of the battery 21 is small unless the external power supply is continued for a long time.

The battery 21 supplies power to the power-consuming device through the first loop in the case where the state of the battery 21 is normal. In the related art, when the state of the battery 21 is abnormal, the first loop may be controlled to be disconnected by the power consumption device or the control module of the battery 21 or the energy storage device when detecting that the state of the battery 21 is abnormal, so that the battery 21 cannot continue to supply power to the power consumption device, in this way, the power consumption device may lose power, and a safety accident may occur when the power consumption device suddenly loses power in the running process. For example, if the first loop is suddenly disconnected during the running process of the electric automobile, the electric automobile loses power, and traffic accidents are easily caused.

In some embodiments of the present application, under the condition that the state of the battery 21 is abnormal, the on-off device 24 is in a conducting state, so that the second loop is closed, and the battery 21 can supply power to the power utilization device through the second loop, so that under the condition that the state of the battery 21 is abnormal, the battery 21 can still supply power to the power utilization device, and the power utilization device does not suddenly lose power, thereby reducing the situation that the power utilization device loses power due to sudden power outage to cause a safety accident. For example, when the battery is abnormal in the running process of the electric automobile, and the first loop is disconnected, the battery provides power for the electric automobile through the second loop, so that a driver can drive the electric automobile to a safety zone and park the electric automobile, and the occurrence of traffic accidents caused by sudden loss of power due to abnormal battery is reduced.

In this embodiment, the first circuit may include an on-off device. In this case, the first circuit is identical to the second circuit, i.e. the energy storage device can supply power to the power utilization device through the second circuit, regardless of whether the state of the battery is normal or abnormal. The on-off device can be connected between the positive electrode end of the energy storage device and the positive electrode end of the battery, or between the negative electrode end of the energy storage device and the negative electrode end of the battery, or between the positive electrode end of the energy storage device and the positive electrode end of the battery, and between the negative electrode end of the energy storage device and the negative electrode end of the battery. The first circuit may not include an on-off device, and in this case, the energy storage device may supply power to the power consumption device through the first circuit when the state of the battery is normal, and may supply power to the power consumption device through the second circuit when the state of the battery is abnormal.

In this embodiment, in the second loop, the on-off device may be connected between the positive electrode terminal of the energy storage device and the positive electrode terminal of the battery, or the on-off device may be connected between the negative electrode terminal of the energy storage device and the negative electrode terminal of the battery, or the on-off device may be connected between the positive electrode terminal of the energy storage device and the positive electrode terminal of the battery, and may be connected between the negative electrode terminal of the energy storage device and the negative electrode terminal of the battery.

In one or more embodiments of the present application, as shown in fig. 2, the energy storage device further includes:

a switching device 25 belonging to the first circuit;

in the case where the state of the battery is normal, the switching device 25 is in an on state.

It will be appreciated that in this case no on-off means are included in the first circuit.

In the case of abnormal state of the battery, the switching device 25 may be in an on state or an off state. Under abnormal battery state, if the switch device 25 is in on state, the first loop and the second loop can both provide power to the power utilization device, and the first loop and the second loop are standby, so that the reliability of external power supply is improved. In the event of an abnormal battery condition, if the switching device 25 is in the off state, the first loop does not provide power to the powered device and the second loop provides power to the powered device, which may save power consumption due to the switching device.

In this embodiment, the switching device 25 includes, but is not limited to, a fuse, a relay, and the like.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

In one or more embodiments of the present application, as shown in fig. 2, the switching device 25 includes:

a first switch sub-means 251 and a second switch sub-means 252;

the first switching sub-means 251 are connected to the positive terminal 22 of the energy storage means and to the positive terminal of the battery 21, respectively, and the second switching sub-means 252 are connected to the negative terminal 23 of the energy storage means and to the negative terminal of the battery 21, respectively.

In one or more embodiments of the present application, the switching device 25 is connected in parallel with the on-off device 24.

In one or more embodiments of the present application, as shown in fig. 2, the on-off device 24 includes:

a first on-off sub-device 241 and a second on-off sub-device 242;

the first on-off sub-device 241 is connected to the positive terminal 22 of the energy storage device and the positive terminal of the battery 21, respectively, and the second on-off sub-device 242 is connected to the negative terminal 23 of the energy storage device and the negative terminal of the battery 21, respectively.

In one or more embodiments of the present application, the on-off device includes:

a thermistor;

the conduction temperature of the thermistor is greater than the upper temperature tolerance limit of the battery.

A thermistor is a sensor resistor whose resistance value changes with a change in temperature. Under the low-temperature environment, the resistance of the thermistor can be increased sharply, and the thermistor is always in an insulating state; in a high temperature environment, the resistance of the thermistor can be rapidly reduced, and the thermistor is in a conducting state. The conduction temperature of the thermistor is used for representing the insulation performance of the thermistor, the thermistor is in a conduction state under the condition that the ambient temperature is larger than the conduction temperature, and the thermistor is in an insulation state under the condition that the ambient temperature is smaller than or equal to the conduction temperature.

The battery in the energy storage device generally has a reasonable working temperature range, when the temperature of the battery is in the reasonable working temperature range, the battery has higher charge and discharge efficiency and can be safely charged and discharged, and when the temperature of the battery exceeds the reasonable working temperature range, the charge and discharge efficiency of the battery is lower and the battery cannot work safely. The upper limit of the withstand temperature in this embodiment refers to the maximum value within the range of reasonable operating temperature. When the temperature of the battery exceeds the upper limit of the withstand temperature, thermal runaway of the battery occurs.

Since the temperature of the battery rapidly exceeds the upper limit of the withstand temperature in the case where thermal runaway occurs, the thermistor is in an on state in this case. Taking the example that the upper limit of the temperature tolerance is 55 ℃, when the battery is in thermal runaway, the temperature of the battery can rapidly exceed 55 ℃, the resistance value of the thermistor rapidly drops, the thermistor is in a conducting state, when the thermal runaway is over, the temperature of the battery is reduced to below 55 ℃, and the resistance value of the thermistor is increased again until the thermistor becomes in an insulating state.

In one or more embodiments of the present application, the on-off device may include:

the moving device is arranged in the shell and divides the closed space formed by the shell into at least two cavities; the moving device can move along the inner wall of the shell;

the first connecting end of the first electric connector and the second connecting end of the second electric connector are placed in the same cavity of the at least two cavities;

The third connecting end of the first electric connector is connected with the energy storage device, and the fourth connecting end of the second electric connector is connected with the battery;

the on-off device is in a conducting state under the condition that the mobile device is contacted with the first connecting end and the second connecting end.

It should be understood that in the case where the on-off device is connected to the negative electrode terminal of the energy storage device and the negative electrode terminal of the battery, the third connection terminal of the first electrical connector is connected to the negative electrode terminal of the energy storage device, and the fourth connection terminal of the second electrical connector is connected to the negative electrode terminal of the battery; under the condition that the on-off device is connected with the positive electrode end of the energy storage device and the positive electrode end of the battery, the third connecting end of the first electric connector is connected with the positive electrode end of the energy storage device, and the fourth connecting end of the second electric connector is connected with the positive electrode end of the battery.

It should be understood that the third connection end and the fourth connection end may be disposed in the same cavity as the first connection end and the second connection end, or may be disposed outside the on-off device.

In this embodiment, in the case that the mobile device is in contact with the first connection terminal and the second connection terminal, if the first connection terminal and the second connection terminal can be in direct contact, the first electrical connector, the second electrical connector and the battery form an electrical path through which the battery can be discharged to the outside. If the first connection terminal and the second connection terminal are brought into indirect contact by the mobile device, the first electrical connector, the second electrical connector, and the battery form an electrical path such that the battery discharges outside through the electrical path.

In the application, mobile device can be realized by slide and slide rail, and the slide rail setting can follow the slide rail and remove on the inner wall of casing. In this embodiment, in the process that the mobile device moves along the inner wall of the housing, the mobile device approaches the first electrical connector and/or the second electrical connector, so as to achieve contact between the mobile device and the first connection end and the second connection end.

Of course, in practical application, the mobile device may also be a device made of a material with a relatively large deformation coefficient, and with the change of the environment in the cavity, the mobile device may be deformed greatly, so that the mobile device contacts the first connection end and the second connection end.

In this embodiment, whether the state of the BATTERY is abnormal or not may be detected by the BMS (BATTERY management system ), and in case of determining the abnormality, the mobile device is controlled to move or deform, thereby achieving contact of the mobile device with the first connection terminal and the second connection terminal.

In one or more embodiments of the present application, a mobile device may include:

the first movable plate and the bleeder vent that sets up on remaining cavity, remaining cavity are not placed the cavity of first link and second link in at least two cavities.

It should be understood that under the condition that the battery is out of control, the battery can produce high-pressure gas rapidly, and the high-pressure gas gets into in the surplus cavity through the bleeder vent for the atmospheric pressure in the surplus cavity is higher than the cavity of placing first link and second link, therefore under the effect of atmospheric pressure difference, first movable plate is pushed to remove or takes place deformation, makes the space of surplus cavity grow, and the space of the cavity of placing first link and second link diminishes, and finally makes first link, second link and mobile device contact. After the thermal runaway of the battery is released, the battery gradually reduces the generation of high-pressure gas, correspondingly, the high-pressure gas entering the residual cavity through the air holes gradually reduces, the pressure difference between the residual cavity and the cavity for placing the first connecting end and the second connecting end gradually reduces, and finally the first connecting end and the second connecting end are disconnected.

It should be understood that when there are a plurality of remaining cavities, in order to improve the reliability of the on-off device, an air vent may be provided on each remaining cavity.

In one or more embodiments of the present application, a mobile device includes:

a first movable plate;

wherein, thermal expansion material has been placed in the remaining cavity, and the remaining cavity is the cavity of not placing first link and second link in at least two cavities.

The thermal expansion material has the characteristics of increasing the volume along with the increase of the ambient temperature and reducing the volume along with the decrease of the ambient temperature. In the case of thermal runaway of the battery, the volume of the thermal expansion material placed in the remaining cavity becomes large, thereby pushing the first movable plate to move or deform, so that the first connection end is in contact with the second connection end, thereby forming an energizing path for external discharge of the battery. And in the case of thermal runaway release of the battery, the volume of the thermal expansion material placed in the remaining cavity is reduced, pushing the first movable plate to move in the opposite direction.

In practice, the thermally expandable material includes, but is not limited to, expanded alloys and the like.

It should be appreciated that when there are a plurality of remaining cavities, a thermal expansion material may be placed in each of the remaining cavities in order to increase the reliability of the on-off device operation.

In one or more embodiments of the present application, the first electrical connector is disposed perpendicular to the first movable plate, and the second electrical connector is disposed perpendicular to the first movable plate;

the first movable plate includes:

a conductive plate and an insulating plate carrying the conductive plate;

the conducting plate is carried on one side of the insulating plate, which is close to the first connecting end and the second connecting end.

In this embodiment, in the case where the first movable plate is in contact with the first connection end and the second connection end, the first connection end and the second connection end are both connected with the conductive plate, and the first connection end, the second connection end and the conductive plate form an energizing path. It should be understood that the area of the conductive plate is equal to or smaller than the area of the insulating plate.

It should be understood that in practical applications, the first movable plate may be directly implemented by using a conductive plate, that is, the first movable plate is entirely a conductive plate.

As an example, a schematic diagram of the on-off device shown in fig. 3 (a) and 3 (b) is given, and fig. 3 (a) includes a housing 31, a first electrical connector 32, a second electrical connector 33, a conductive plate 34, an insulating plate 35;

wherein, the insulating board 35 is placed perpendicularly with the first electric connector 32 and the second electric connector 33, the first electric connector 32 and the second electric connector 33 are placed in parallel, the insulating board 35 divides the airtight space around the housing 31 into a first cavity and a second cavity, the first connecting end of the first electric connector 32 and the second connecting end of the second electric connector 33 are all placed in the first cavity, the third connecting end of the first electric connector 32 and the fourth connecting end of the second electric connector 33 are placed outside the housing, the conductive plate 34 is placed on one side of the insulating board 35 close to the first electric connector 32 and the second electric connector 33, and the second cavity is filled with an easily expandable material.

In the case of thermal runaway of the battery, the volume of the easily expandable material becomes larger, and the insulating plate 35 is pushed to drive the conductive plate 34 to move towards the first electrical connector 32 and the second electrical connector 33 until the conductive plate 34 contacts the first connection end and the second connection end respectively, so that the first electrical connector 32, the conductive plate 34 and the second electrical connector 33 form an energizing path. In the case of thermal runaway release of the battery, the volume of the easily expandable material becomes smaller, and the insulating plate 35 drives the conductive plate 34 away from the first and second electrical connectors 32 and 33, and the conductive plate 34 is separated from the first and second connection terminals.

As an example, on the basis of the structure of the on-off device of fig. 3 (a) and 3 (b), a schematic diagram of the on-off device shown in fig. 4 is given, and with respect to the on-off device of fig. 3 (a) and 3 (b), the second chamber of the on-off device of fig. 4 is provided with ventilation holes 36. The second chamber may or may not be filled with an expandable material.

Taking the principle that the second cavity is not filled with the easily-expandable material as an example of the on-off device in fig. 4, under the condition that the battery is in thermal runaway, the battery generates high-pressure gas, the high-pressure gas enters the second cavity through the ventilation holes 36, the air pressure of the second cavity is higher than that of the first cavity, and under the action of pressure difference, the insulating plate 35 drives the conductive plate 34 to move towards the first electrical connector 32 and the second electrical connector 33 until the conductive plate 34 is respectively contacted with the first connection end and the second connection end, so that the first electrical connector 32, the conductive plate 34 and the second electrical connector 33 form an electrified path. In the case of thermal runaway release of the battery, the pressure difference between the first and second cavities gradually decreases, and the insulating plate 35 drives the conductive plate 34 away from the first and second electrical connectors 32 and 33, and the conductive plate 34 is separated from the first and second connection terminals.

In one or more embodiments of the present application, the mobile device may further include:

a second movable plate;

the first movable plate, the second movable plate, the first electric connector and the second electric connector are arranged in parallel with each other; the first movable plate is connected with the first electric connector, and the second movable plate is connected with the second electric connector; the first movable plate, the second movable plate and the cavity of the housing enclosure are provided with a first connecting end and a second connecting end.

As an example, a schematic diagram of the on-off device shown in fig. 5 (a) and 5 (b) is given, the on-off device of fig. 5 including a housing 51, a first electrical connector 52, a second electrical connector 53, a first movable plate 54, and a second movable plate 55;

the first electrical connector 52, the second electrical connector 53, the first movable plate 54 and the second movable plate 55 are disposed parallel to each other, the first electrical connector 52 is connected with the first movable plate 54, the second electrical connector 53 is connected with the second movable plate 55, the first movable plate 54 and the second movable plate 55 divide the enclosed space of the housing into three cavities (the first cavity, the second cavity and the third cavity are respectively marked from left to right), the first connecting end and the second connecting end are disposed in the second cavity, the third connecting end of the first electrical connector 52 and the fourth connecting end of the second electrical connector 53 are disposed outside the housing, and the first cavity and the third cavity are filled with an expandable material.

In the case of thermal runaway of the battery, the volume of the easily expandable material becomes large, pushing the first movable plate 54 and the second movable plate 55 toward each other until the first connection end on the first movable plate 54 and the second connection end on the second movable plate 55 come into contact, so that the first electrical connector 52 and the second electrical connector 53 form an electrical path. In the case of thermal runaway release of the battery, the volume of the expandable material becomes smaller, and the first movable plate 54 and the second movable plate 55 face away from each other, so that the first connection terminal is disconnected from the second connection terminal.

As an example, on the basis of the structure of the on-off device of fig. 5, a schematic diagram of the on-off device shown in fig. 6 is given, and in the on-off device of fig. 6, ventilation holes 56 are provided in the first and third chambers, relative to the on-off device of fig. 5.

In the case of thermal runaway of the battery, the battery generates high-pressure gas, the high-pressure gas enters the first cavity and the third cavity through the ventilation holes 56, the air pressure of the first cavity and the air pressure of the third cavity are higher than those of the second cavity, the first movable plate 54 and the second movable plate 55 move towards each other under the action of the pressure difference until the first connection end on the first movable plate 54 and the second connection end on the second movable plate 55 are in contact, and the first electric connection body 52 and the second electric connection body 53 form an electrifying path. In the case of thermal runaway release of the battery, the pressure difference between the first and second chambers is reduced while the pressure difference between the third and second chambers is reduced, and the first and second movable plates 54 and 55 face away from each other, so that the first connection terminal is disconnected from the second connection terminal.

In application, the control device can determine whether the state of the battery is abnormal or not based on the electrical parameters such as the voltage, the temperature, the air pressure and the like of the battery. For example, the electrical parameter can be compared with a preset parameter threshold, and the abnormal state of the battery is determined under the condition that the electrical parameter is greater than or equal to the parameter threshold; and when the electrical parameter is smaller than the parameter threshold, determining that the state of the battery is normal. In the application, in order to improve the power supply reliability of the battery, the on-off device can be controlled to be conducted when the state of the battery is about to be abnormal. In particular, when the electrical parameter of the battery is smaller than the parameter threshold and the absolute value of the difference between the electrical parameter and the parameter threshold is smaller than the absolute value threshold, determining that the state of the battery is about to be abnormal.

In this embodiment, the battery may actively report the electrical parameters of the battery to the control device, so that the control device determines whether the state of the battery is abnormal based on the electrical parameters. Of course, a monitoring device which is simultaneously communicated with the battery and the control device can be deployed, the monitoring device actively collects the electrical parameters of the battery, and the collected electrical parameters are reported to the control device. To reduce the control costs, the control device may reuse the BMS in the energy storage device.

In one or more embodiments of the present application, an electrical device is provided, where the electrical device includes the energy storage device of the foregoing embodiments.

As an example, a new energy electric car will be described in detail below. As shown in fig. 7, the electric device includes a load 71 and an energy storage device 72, and the energy storage device 72 includes a battery 21, a first relay 251, a second relay 252, a first on-off device 241, and a second on-off device 242.

The first relay 251 and the first switching device 241 are connected in parallel between the positive electrode of the battery 21 and the positive electrode of the energy storage device 72, and the second relay 252 and the second switching device 242 are connected in parallel between the negative electrode of the battery 21 and the negative electrode of the energy storage device 72.

When the state of the battery is abnormal, the first relay 251 and the second relay 252 are in an off state, and the first on-off 241 and the second on-off 242 are in an on state.

In one or more embodiments of the present application, a method for controlling an energy storage device is provided, where the method may be applied to an energy storage device including a control device in the foregoing embodiments, as shown in fig. 8, and the method may include the following steps:

step 801, obtaining an electrical parameter for representing a state of a battery;

step 802, controlling the on-off device to be conducted under the condition that the state of the battery meets the preset abnormal condition based on the electrical parameter.

The preset abnormal condition is used for representing that the electrical parameter of the battery exceeds a parameter threshold value of the battery in a normal working state. By way of example, assuming that the temperature interval of the battery in the normal operating state is (-20 ℃,55 ℃), when it is monitored that the temperature of the battery exceeds 55 ℃, it is possible to determine that the state of the battery satisfies a preset abnormal condition.

Wherein the battery parameters include, but are not limited to, air pressure, temperature, etc.

In the scheme provided by the embodiment, the control device judges whether the state of the battery is abnormal based on the electrical parameters, and the control device controls the on-off device to be conducted, so that the reliability of the action of the on-off device is improved.

In one or more embodiments of the present application, the method may further include:

and under the condition that the state of the battery is determined to be switched from meeting the preset abnormal condition to meeting the preset normal condition based on the electrical parameter, controlling the on-off device to be turned off.

The preset normal conditions are used for representing that the electrical parameters of the battery meet parameter thresholds of the battery in a normal working state.

In one or more embodiments of the present application, determining, based on an electrical parameter, that a state of a battery is switched from meeting a preset abnormal condition to meeting a preset normal condition includes:

under the condition that the electrical parameter represents that the external load of the battery meets the power consumption stop condition, the state of the battery is determined to be switched from meeting the preset abnormal condition to meeting the preset normal condition.

Wherein the power consumption stop condition is used to characterize the power output of the external load without the need for an energy storage device. Taking an external load as an example of the whole vehicle, when the whole vehicle is monitored to stop based on the electrical parameter, the external load can be confirmed to meet the power consumption stopping condition.

The embodiment of the application further provides a control device of an energy storage device, as shown in fig. 9, may include:

an acquisition module 91 for acquiring electrical parameters for characterizing the state of the battery;

and the control module 92 is used for controlling the on-off device to be conducted under the condition that the state of the battery meets the preset abnormal condition based on the electrical parameter.

In some embodiments, the apparatus is further to:

In some embodiments, the apparatus is for:

The embodiment of the application also provides an electric device for executing the control method of the energy storage device. Please refer to fig. 10, which illustrates a schematic diagram of an electrical device according to some embodiments of the present application. As shown in fig. 10, the power consumption device 10 includes: a processor 800, a memory 801, a bus 802 and a communication interface 803, the processor 800, the communication interface 803 and the memory 801 being connected by the bus 802; the memory 801 stores a computer program executable on the processor 800, and the processor 800 executes the method for controlling the energy storage device according to any of the foregoing embodiments of the present application when the computer program is executed.

The memory 801 may include a high-speed random access memory (RAM: random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. The communication connection between the device network element and the at least one other network element is achieved through at least one communication interface 803 (which may be wired or wireless), the internet, a wide area network, a local network, a metropolitan area network, etc. may be used.

Bus 802 may be an ISA bus, a PCI bus, or an EISA bus, among others. The buses may be classified as address buses, data buses, control buses, etc. The memory 801 is configured to store a program, and the processor 800 executes the program after receiving an execution instruction, and the control method of the energy storage device disclosed in any embodiment of the present application may be applied to the processor 800 or implemented by the processor 800.

The processor 800 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the methods described above may be performed by integrated logic circuitry in hardware or instructions in software in processor 800. The processor 800 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 801, and the processor 800 reads information in the memory 801 and performs the steps of the above method in combination with its hardware.

The power utilization device provided by the embodiment of the application and the control method of the energy storage device provided by the embodiment of the application are the same in inventive concept, and have the same beneficial effects as the method adopted, operated or realized by the power utilization device.

The present embodiment also provides a computer readable storage medium corresponding to the method for controlling an energy storage device provided in the foregoing embodiment, referring to fig. 11, the computer readable storage medium is shown as an optical disc 30, on which a computer program (i.e. a program product) is stored, where the computer program, when executed by a processor, performs the method for controlling an energy storage device provided in any of the foregoing embodiments.

It should be noted that examples of the computer readable storage medium may also include, but are not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical or magnetic storage medium, which will not be described in detail herein.

The computer readable storage medium provided by the above embodiments of the present application and the control method of the energy storage device provided by the embodiments of the present application have the same beneficial effects as the method adopted, operated or implemented by the application program stored therein, because of the same inventive concept.

It should be noted that:

in the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the following schematic diagram: i.e., the claimed application requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An energy storage device, comprising:

2. The energy storage device of claim 1, further comprising:

switching means belonging to said first circuit;

3. The energy storage device of claim 2, wherein the switching device comprises:

a first switching sub-means and a second switching sub-means;

4. The energy storage device of claim 2, wherein the switching device is connected in parallel with the on-off device.

5. The energy storage device of claim 1, wherein the on-off device comprises:

a first on-off sub-device and a second on-off sub-device;

6. The energy storage device of any of claims 1-5, wherein the on-off device comprises:

a thermistor;

7. The energy storage device of any of claims 1-5, wherein the on-off device comprises:

8. The energy storage device of claim 7, wherein the mobile device comprises:

9. The energy storage device of claim 7, wherein the mobile device comprises:

a first movable plate;

10. The energy storage device of claim 8 or 9, wherein the first electrical connector is disposed perpendicular to the first movable plate and the second electrical connector is disposed perpendicular to the first movable plate;

the first movable plate includes:

a conductive plate and an insulating plate carrying the conductive plate;

11. The energy storage device of claim 8 or 9, wherein the mobile device further comprises:

a second movable plate;

12. The energy storage device of any of claims 1-5, further comprising:

13. A control method of an energy storage device, applied to the energy storage device of claim 12, the method comprising:

14. The method as recited in claim 13, further comprising:

15. The method of claim 14, wherein determining, based on the electrical parameter, that the state of the battery is switched from meeting the preset abnormal condition to meeting a preset normal condition comprises:

16. An electrical device comprising an energy storage device according to any one of claims 1-12.