CN118173923A - Battery charging method and electronic equipment - Google Patents

Abstract

The embodiment of the present invention discloses a battery charging method and an electronic device. The battery charging method includes: using different charging methods to test the temperature rise and capacity of the battery, and the charging methods include: constant current charging, constant voltage charging, constant current and constant voltage charging, and constant power charging; comparing the charging time, temperature rise, and capacity of different charging methods respectively; optimizing different charging methods and obtaining optimized charging methods, and selecting different optimized charging methods according to different needs. The present invention reduces the heat generation during the charging process of lithium-ion batteries, can shorten the charging time, improve the safety and charging efficiency of lithium-ion batteries, reduce the occurrence of safety accidents, and extend the service life of the battery.

Description

Battery charging method and electronic device

Technical Field

The embodiments of the present invention relate to the technical field of lithium-ion batteries, and in particular to a battery charging method and electronic equipment.

Background technique

As an energy storage device, rechargeable lithium-ion batteries (LIBs) have attracted great attention due to their long cycle life, high operating voltage, high specific energy, low self-discharge, and environmental protection. LIBs have been widely used in portable consumer electronics, electric vehicles, and energy storage. The charging time and safety of LIBs have always been a focus of attention and an urgent issue to be solved. Most safety accidents of LIBs occur during the charging process. Reasonable charging methods and stable and reliable chargers can shorten the charging time and improve the safety of LIBs.

The charging temperature of LIBs is affected by the ambient temperature and its own thermal effect. The thermal effect of LIBs charging is closely related to the charging method. At present, the existing charging methods and charging equipment corresponding to the capacity do not consider the influence of LIBs temperature, resulting in frequent safety accidents or affecting the service life of LIBs during the charging process. The charging process is the process of lithium insertion in the negative electrode, and the temperature of LIBs during charging affects the performance of lithium insertion.

Summary of the invention

The present invention provides a battery charging method and electronic equipment, which can reduce the heat generation during the charging process of a lithium-ion battery, shorten the charging time, improve the safety and charging efficiency of the lithium-ion battery, reduce the occurrence of safety accidents and extend the service life of the battery.

According to one aspect of the present invention, a battery charging method is provided, the battery charging method comprising:

The temperature rise and capacity of the battery are tested by using different charging methods, including constant current charging, constant voltage charging, constant current and constant voltage charging, and constant power charging;

Comparing the charging time, temperature rise and capacity of the different charging methods;

The different charging methods are optimized to obtain optimized charging methods, and different optimized charging methods are selected according to different needs.

Optionally, the optimized charging method includes: step constant current charging, step constant voltage charging and step constant power charging.

Optionally, the comparing the charging time, temperature rise and capacity of the different charging methods respectively includes:

Taking the cut-off voltage as a reference, the charging time, temperature rise and capacity of the constant current charging, the constant voltage charging, the constant current and constant voltage charging and the constant power charging are compared.

Optionally, the different required selections include: charging current and charging power.

Optionally, the charging current ranges from 0 to 1C, where C is the current intensity when the battery is fully discharged in one hour.

Optionally, the charging power ranges from 0 to 10C*U _N , where U _N is a nominal voltage.

According to another aspect of the present invention, there is also provided an electronic device, the electronic device comprising:

one or more processors;

A memory for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the battery charging method as described in any embodiment of the present invention.

The technical solution of the embodiment of the present invention proposes a reasonable battery charging method, which reduces the heat generated during the charging process, can shorten the charging time while improving the safety and charging efficiency of the lithium-ion battery, reduce the occurrence of safety accidents and extend the service life of the battery. In summary, the present invention solves the problems of high safety accidents, long charging time, low charging efficiency and shortened battery service life during the charging process of lithium-ion batteries.

It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a flow chart of a battery charging method provided according to an embodiment of the present invention;

FIG2 is a schematic diagram of a constant current charging curve of a battery cell provided according to an embodiment of the present invention;

FIG3 is a schematic diagram of a constant voltage charging curve of a battery cell provided according to an embodiment of the present invention;

FIG4 is a schematic diagram of a constant current and constant voltage charging curve of a battery cell provided according to an embodiment of the present invention;

FIG5 is a schematic diagram of a constant power charging curve of a battery cell provided according to an embodiment of the present invention;

FIG6 is a schematic diagram of a step constant current charging according to an embodiment of the present invention;

FIG7 is a schematic diagram of a step constant voltage charging according to an embodiment of the present invention;

FIG8 is a schematic diagram of charging voltage of a step constant power charging according to an embodiment of the present invention;

FIG9 is a schematic diagram of charging power according to a step constant power charging method provided in an embodiment of the present invention;

FIG10 is a diagram of an intelligent control of a temperature sensing charger provided according to an embodiment of the present invention;

FIG11 is a temperature sensing charger command execution reference diagram provided according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

FIG1 is a flow chart of a battery charging method provided according to an embodiment of the present invention. Referring to FIG1 , an embodiment of the present invention provides a battery charging method. The engine backfire detection method can be executed by a battery charging device. The battery charging device can be integrated into an electronic device. The battery charging device can be implemented by software and/or hardware. The battery charging method includes the following steps:

S110, using different charging methods to test the temperature rise and capacity of the battery, the charging methods including: constant current charging, constant voltage charging, constant current and constant voltage charging, and constant power charging.

Specifically, the instruments and equipment used for battery temperature rise testing and capacity testing include: charging and discharging equipment, constant humidity and heat test chamber, and temperature sensor.

The process of battery temperature rise test is as follows: pre-treat the battery to stabilize the battery performance, place it in a constant humidity and heat test chamber for 5 hours to keep the battery temperature at 25±0.5℃, and after adding an insulating sleeve and placing a temperature sensing line to the battery, conduct an adiabatic charging temperature rise test.

The process of battery capacity test is as follows: after the battery temperature rise test, remove the insulation cover and place it in a constant humidity and heat test chamber for 5 hours, so that the battery temperature is at 25±0.5℃, discharge at a rate of 1C until the cut-off voltage reaches 2.5V, and test the capacity of the battery cell.

Optionally, the temperature rise and capacity test of the battery using constant current charging includes:

The battery is charged at a preset constant current until the cut-off voltage is reached, and the voltage, current, charging time, temperature and capacity data are recorded during the battery charging process.

Optionally, the cut-off voltage is 3.65V and the preset current is 1C.

Specifically, the battery is charged with a constant current at a preset current of 1C until the cut-off voltage of 3.65V is reached, and the voltage, current, charging time, temperature and capacity data of the battery cell are recorded during the charging process. Figure 2 is a schematic diagram of a constant current charging curve of a battery cell provided according to an embodiment of the present invention. Referring to Figure 2, Figure 2 shows the voltage and current changes of the battery cell constant current charging when the battery is subjected to a temperature rise test using a constant current charging method. The thick curve is the voltage curve, and the thin curve is the current curve.

Optionally, the temperature rise and capacity test of the battery using constant voltage charging includes:

The battery is charged at a constant voltage with a cut-off voltage, and the data of voltage, current, charging time, temperature and capacity during the charging process of the battery cell are recorded.

Specifically, the battery is charged at a constant voltage with a cut-off voltage of 3.65V, and the voltage, current, charging time, temperature and capacity data are recorded during the charging process of the battery. Figure 3 is a schematic diagram of a constant voltage charging curve of a battery provided according to an embodiment of the present invention. Referring to Figure 3, Figure 3 shows the voltage and current changes of the battery constant current charging when the battery is subjected to a temperature rise test using a constant voltage charging method. The thick curve is the voltage curve, and the thin curve is the current curve.

Optionally, the temperature rise and capacity test of the battery using constant current and constant voltage charging includes:

The battery is charged at a constant current with a preset current until the cut-off voltage is reached;

The battery is charged at a constant voltage at the cut-off voltage until the cut-off current is reached, and the voltage, current, charging time, temperature and capacity data are recorded during the charging process of the battery cell.

Optionally, the cut-off voltage is 3.65V, the preset current is 1C, and the cut-off current is 0.05C.

Specifically, the battery is charged with a constant current at a preset current of 1C until the cut-off voltage reaches 3.65V, and then the battery is charged with a constant voltage at a voltage of 3.65V until the cut-off current reaches 0.05C, and the data of the voltage, current, charging time, temperature and capacity of the battery cell charging process are recorded. Figure 4 is a schematic diagram of a constant current and constant voltage charging curve of a battery cell provided according to an embodiment of the present invention. Referring to Figure 4, Figure 4 shows the voltage and current changes of the constant current and constant voltage charging of the battery cell when the temperature rise test of the battery is performed using a constant current and constant voltage charging method. The thick curve is the voltage curve, and the thin curve is the current curve.

Optionally, the temperature rise and capacity test of the battery using constant power charging includes:

The battery is charged at a constant power with a preset power until the cut-off voltage is reached, and the data of voltage, current, charging time, temperature and capacity of the battery cell charging process are recorded.

Specifically, the battery is charged at a constant power of 1C*3.3V until the cut-off voltage reaches 3.65V, and the data of the voltage, current, charging time, temperature and capacity of the battery cell charging process are recorded. Figure 5 is a schematic diagram of a constant power charging curve of a battery cell provided according to an embodiment of the present invention. Referring to Figure 5, Figure 5 shows the voltage and current changes of the battery cell constant current charging when the battery is subjected to a temperature rise test using a constant power charging method. The thick curve is the voltage curve, and the thin curve is the current curve.

S120. Compare the charging time, temperature rise and capacity of different charging methods.

Specifically, with a cut-off voltage of 3.65V, the charging time, temperature and capacity of constant current charging (1C), constant voltage charging (3.65V), constant current and constant voltage charging (1C/3.65V/0.05C) and constant power charging (1C*3.3V/3.65V) were compared.

Optionally, the charging time, temperature rise and capacity of different charging methods are compared respectively including:

Taking the cut-off voltage as the benchmark, the charging time, temperature rise and capacity of constant current charging, constant voltage charging, constant current and constant voltage charging and constant power charging are compared.

The comparison table of charging time, temperature and capacity of different charging methods is shown in Table 1:

Table 1

Charging time: constant current and constant voltage charging > constant current charging > constant power charging > constant voltage charging.

Temperature: constant voltage charging > constant power charging > constant current and constant voltage charging > constant current charging.

Capacity: constant current and constant voltage charging > constant power charging > constant current charging > constant voltage charging.

For SOC cells with a starting capacity of 0, constant voltage charging is the worst and is not recommended; considering charging time, constant power charging is the best; considering charging efficiency and safety, constant current charging is the best; to maximize cell capacity, constant current and constant voltage charging is the best, but it is not very practical. Taking all factors into consideration, constant power charging and constant current charging are the better options.

S130, optimizing different charging methods and obtaining optimized charging methods, and selecting different optimized charging methods according to different needs.

Optionally, the optimized charging method includes: step constant current charging, step constant voltage charging and step constant power charging.

Specifically, different charging methods are respectively optimized to obtain optimized charging methods: step constant current charging, step constant voltage charging and step constant power charging.

FIG6 is a schematic diagram of a step constant current charging provided according to an embodiment of the present invention. Referring to FIG6 , FIG6 shows the change of charging current of the step constant current charging.

FIG. 7 is a schematic diagram of a step constant voltage charging provided according to an embodiment of the present invention. Referring to FIG. 7 , FIG. 7 shows a change in charging voltage of the step constant voltage charging.

Figure 8 is a charging voltage schematic diagram of a step constant power charging provided according to an embodiment of the present invention, and Figure 9 is a charging power schematic diagram of a step constant power charging provided according to an embodiment of the present invention. Referring to Figures 8 and 9, Figures 8 and 9 respectively show the changes in the charging voltage and charging power of the step constant power charging.

The advantages and disadvantages of different charging methods are shown in Table 2:

Table 2

Users can choose different charging methods according to different needs.

Optionally, different required selections include: charging current and charging power.

Optionally, the charging current ranges from 0 to 1C, where C is the current intensity when the battery is fully discharged in one hour.

Optionally, the range of charging power is: 0~10C*U _N , where U _N is the nominal voltage.

Specifically, choosing different charging methods mainly depends on the user's charging needs. For slow charging and safety, step constant current charging is chosen; for fast charging, step constant power charging can be chosen. Which charging method to use depends on the user's scenario needs, and temperature is better used for differentiation.

For example, in order to minimize the temperature rise, step constant current charging and step constant power charging are preferred. In order to meet the charging safety requirements, step constant current charging is adopted. In order to meet the charging time requirements, step constant power charging is adopted.

The technical solution of the embodiment of the present invention proposes a reasonable battery charging method, which reduces the heat generated during the charging process, can shorten the charging time while improving the safety and charging efficiency of the lithium-ion battery, reduce the occurrence of safety accidents and extend the service life of the battery. In summary, the present invention solves the problems of high safety accidents, long charging time, low charging efficiency and shortened battery service life during the charging process of lithium-ion batteries.

FIG10 is a diagram of intelligent control of a temperature sensing charger according to an embodiment of the present invention. Referring to FIG10 , an embodiment of the present invention further provides a battery charger, the battery charger comprising: a sensing unit 101, a control unit 102, and an applying unit 103;

The battery is connected to the sensing unit 101, and the sensing unit 101 is connected to the control unit 102. The sensing unit 101 is used to detect the temperature and voltage of the battery and send them to the control unit 102;

The control unit 102 is connected to the applying unit 103, and the applying unit 103 is connected to the battery. The control unit 102 is used to control the applying unit 103 to apply corresponding charging parameters to charge the battery according to the temperature and voltage range of the battery.

Specifically, the battery charger can be a temperature sensing charger. The user selects the charging mode, the sensing unit 101 detects the temperature and voltage of the battery, and the control unit 102 controls the application unit 103 to apply different steps of constant current, constant voltage, and constant power charging parameters to charge the battery according to the temperature range and voltage range of the battery. For example, the applicable range of the battery temperature is -20°C to 55°C, and each 5°C is a temperature range, and different steps of constant current, constant voltage, and constant power charging parameters are applied.

The embodiment of the present invention provides a temperature-sensitive battery charger that is variable in temperature range, which shortens the charging time and improves the safety of lithium-ion battery charging.

FIG11 is a temperature sensing charger command execution reference diagram provided in an embodiment of the present invention. Referring to FIG11 , FIG11 shows the entire process of the charger controlling the battery charging command execution according to temperature and voltage in different charging modes.

FIG12 shows a schematic diagram of the structure of an electronic device 1 that can be used to implement an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and/or required herein.

As shown in FIG12 , the electronic device 1 includes at least one processor 11, and a memory connected to the at least one processor 11 in communication, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 1 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to the bus 14.

A number of components in the electronic device 1 are connected to the I/O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 1 to exchange information/data with other devices through a computer network such as the Internet and/or various telecommunication networks.

The processor 11 may be a variety of general and/or dedicated processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, for example, a battery charging method.

In some embodiments, the battery charging method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed on the electronic device 1 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the battery charging method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the battery charging method in any other appropriate manner (e.g., by means of firmware).

Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and/or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions/operations specified in the flow chart and/or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1.A battery charging method, comprising:

And adopting different charging modes to test the temperature rise and the capacity of the battery, wherein the charging modes comprise: constant-current charging, constant-voltage charging, constant-current constant-voltage charging, and constant-power charging;

Respectively comparing the charging time, the temperature rise and the capacity of the different charging modes;

Optimizing the different charging modes and obtaining optimized charging modes, and selecting different optimized charging modes according to different requirements.

2. The battery charging method according to claim 1, wherein the optimized charging mode includes: step constant current charging, step constant voltage charging and step constant power charging.

3. The battery charging method according to claim 1, wherein comparing the charging time, temperature rise and capacity of the different charging modes, respectively, comprises:

And comparing the charging time, the temperature rise and the capacity of the constant-current charging, the constant-voltage charging, the constant-current constant-voltage charging and the constant-power charging by taking the cut-off voltage as a reference.

4. The battery charging method of claim 1, wherein the different desired selections comprise: charging current and charging power.

5. The battery charging method of claim 4, wherein the range of charging currents is: 0-1C, wherein C is the current intensity of the battery when fully discharged for one hour.

6. The battery charging method according to claim 4, wherein the range of the charging power is: 0-10 c x U _N, wherein U _N is the nominal voltage.

7. An electronic device, comprising:

One or more processors;

A memory for storing one or more programs;

When executed by the one or more processors, causes the one or more processors to implement the battery charging method of any one of claims 1-6.