A method and apparatus for testing a battery equalization function

Abstract

The application discloses a battery equalization function test method and device, and relates to the technical field of battery testing. The battery equalization function test device comprises a battery charging and discharging module, a BMS equalization circuit and a Hall collection circuit. The battery charging and discharging module is used for performing charging and discharging cycle test until a preset condition for starting the battery equalization function is reached in the test process. The BMS equalization circuit is connected with the battery charging and discharging module. The Hall collection circuit is connected with the BMS equalization circuit. The beneficial effect is that the electromagnetic characteristics of the Hall sensor are adopted, the Hall sensor is indirectly obtained in the mode of penetrating through the voltage collection wire harness to obtain the equalization current value of the battery module in the charging and discharging process without damaging the BMS equalization circuit, the size of the equalization current and the length of the equalization time are used as the main determination indexes of the battery equalization function, the technical scheme of the application does not increase the internal resistance value of the original line, has little influence on the collection of the micro-current, and can truly reflect the current value in the line.

Description

Technical Field

[0001] This application belongs to the field of battery testing technology, and more specifically, this application relates to a test method and apparatus for battery balancing function. Background Technology

[0002] Existing Battery Management Systems (BMS) claim to have active or passive balancing functions, with balancing currents reaching 3A or even higher, supposedly improving system consistency. However, feedback from existing project operation data indicates that the balancing function has not performed as expected. Lithium-ion battery integration manufacturers need a circuit to intuitively evaluate the effectiveness of battery balancing functions, allowing for rapid verification of their quality. Balancing is achieved through two methods: energy transfer or dissipation between individual lithium-ion battery cells via balancing circuits. The most basic manifestation of this is current. The magnitude of the current and the duration of its presence can serve as important criteria for evaluating the quality of battery balancing functions.

[0003] Currently, the industry lacks effective means and testing methods for obtaining current values ​​in balancing circuits. The conventional current detection method involves connecting an ammeter in series with the balancing circuit to directly collect the balancing current value. However, this method increases the internal resistance of the original circuit and significantly affects the acquisition of minute currents, failing to accurately reflect the actual current value in the circuit. Summary of the Invention

[0004] The purpose of this application is to provide a test method and apparatus for battery balancing function, so as to solve the technical problem in the prior art that it cannot accurately reflect the current value in the circuit.

[0005] To achieve the above technical objectives, the technical solution adopted in this application is as follows:

[0006] A battery balancing function testing device, comprising:

[0007] The battery charge / discharge module is used to perform charge / discharge cycle tests until the preset conditions for activating the battery balancing function are met during the test.

[0008] The BMS equalization circuit is connected to the battery charging and discharging module and is used to collect basic data during the test process, as well as to realize energy transfer or energy dissipation between individual cells to generate current.

[0009] A Hall effect acquisition circuit, which is connected to the BMS equalization circuit, is used to acquire the change time of the analog signal based on the BMS equalization circuit and calculate the magnitude of the equalization current, and to determine the quality of the battery equalization function based on the change time of the analog signal and the magnitude of the equalization current.

[0010] Preferably, the battery charging and discharging module includes a charging and discharging machine and a battery main control box, the charging and discharging machine and the battery main control box are connected, the charging and discharging machine is used to preset multiple charging and discharging modes, and the battery main control box is used to protect the battery module.

[0011] Preferably, the BMS equalization circuit includes a battery module and a battery management system, the battery module and the battery management system are connected, the battery module is used to store electrical energy, and the battery management system is used to collect basic data during the test process.

[0012] Preferably, the battery module includes multiple individual battery cells, multiple voltage acquisition harnesses, and multiple welded aluminum busbars, wherein the welded aluminum busbars are respectively connected to the individual battery cells and the voltage acquisition harnesses.

[0013] Preferably, the Hall acquisition circuit includes a Hall sensor, a Hall power supply system, and a Hall output acquisition system, wherein the Hall sensor is connected to the Hall power supply system and the Hall output acquisition system, respectively.

[0014] Preferably, the Hall power supply system includes a Hall power supply circuit and a DC power supply, wherein the DC power supply is connected to the Hall power supply circuit and the Hall power supply circuit is connected to the Hall sensor.

[0015] Preferably, the Hall output acquisition system includes a Hall signal acquisition line and a paperless recorder, wherein the paperless recorder and the Hall signal acquisition line are connected to the Hall sensor.

[0016] A method for testing battery balancing function includes the following steps:

[0017] The charging and discharging process of the charger is set based on the parameter information of the battery module. The battery module is then subjected to charge and discharge cycle test based on the charging and discharging process until the preset conditions for activating the battery balancing function are met during the test.

[0018] After the battery balancing function is enabled, the BMS balancing circuit generates current. Based on the change time of the analog signal in the Hall acquisition circuit acquired by the BMS balancing circuit and the magnitude of the balancing current, the quality of the battery balancing function is judged based on the change time of the analog signal and the magnitude of the balancing current.

[0019] An electronic device includes a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement a test method for a battery balancing function as described above.

[0020] A computer-readable storage medium storing computer instructions that, when executed by a processor, implement the steps of the method described above.

[0021] The beneficial effects provided by this application are as follows:

[0022] 1. This application includes a battery charging and discharging module, a BMS equalization circuit, and a Hall acquisition circuit. It utilizes the electromagnetic characteristics of a Hall sensor to indirectly obtain the equalization current value of the battery module during charging and discharging without damaging the BMS equalization circuit. The magnitude of the equalization current and the duration of the equalization time are used as the main indicators for judging the battery equalization function. The technical solution of this application does not increase the internal resistance of the original circuit and has little impact on the acquisition of micro-currents, thus accurately reflecting the current value in the circuit.

[0023] 2. The testing device in this application is small in size and highly reliable. It can detect the multi-channel balancing current in the battery module by adding Hall sensors, thereby reducing data errors. The testing device has strong compatibility; only the corresponding battery main control box needs to be replaced to determine the quality of the balancing function of batteries from different manufacturers and models. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the charging and discharging of a single battery module;

[0026] Figure 2 This is a schematic diagram of collecting equalization current;

[0027] Figure 3 This is a schematic diagram of the testing device;

[0028] The symbols for the main components are explained below:

[0029] 1. Welded aluminum busbar; 2. Individual battery cell; 3. Voltage acquisition harness; 4. Battery management system; 5. Hall sensor; 6. Hall power supply circuit; 7. DC power supply; 8. Hall signal acquisition line; 9. Paperless recorder. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] Example 1:

[0033] This embodiment includes a battery balancing function testing device, including a battery charge and discharge module, for performing charge and discharge cycle tests until the preset conditions for activating the battery balancing function are met during the test.

[0034] The BMS equalization circuit is connected to the battery charging and discharging module. It is used to collect basic data during the test process and to generate current by realizing energy transfer or energy dissipation between individual cells 2.

[0035] The Hall effect acquisition circuit is connected to the BMS equalization circuit. It is used to acquire the change time of the analog signal based on the BMS equalization circuit and calculate the magnitude of the equalization current. The quality of the battery equalization function is judged based on the change time of the analog signal and the magnitude of the equalization current.

[0036] In this embodiment, the change time of the analog signal is used as the effective time of the battery equalization function, hereinafter referred to as the equalization time. The larger the equalization current or the longer the equalization time, the more significant the improvement in the consistency performance of the battery module (the reduction of the voltage difference within the battery module and the increase of the charging and discharging capacity). Therefore, the magnitude of the equalization current and the length of the equalization time can be used as the main indicators for judging the battery equalization function.

[0037] The battery charging / discharging module includes a charger / discharger and a battery main control box, which are connected to each other. The charger / discharger is used to preset multiple charging / discharging modes, while the battery main control box is used to protect the battery module. In this embodiment, the charger / discharger is a device that provides and consumes electrical energy, and can be set to various charging / discharging modes such as constant voltage, constant current, constant voltage and constant current, and constant power to charge and discharge the battery module. The battery main control box is a device that protects the battery module during the charging and discharging process, preventing safety hazards caused by overcharging or over-discharging.

[0038] The BMS equalization circuit includes a battery module and a battery management system 4. The battery module and the battery management system 4 are connected. The battery module is used to store electrical energy, and the battery management system 4 is used to collect basic data during the test.

[0039] The battery module includes multiple individual battery cells 2, multiple voltage acquisition harnesses 3, and multiple welded aluminum busbars 1. The welded aluminum busbars 1 are connected to the individual battery cells 2 and the voltage acquisition harnesses 3, respectively. In this embodiment, the battery module is a device for storing electrical energy. The battery module also includes several charge / discharge terminals and a chassis, among other components. The battery management system 4 is a device that collects information such as the voltage and temperature of the individual battery cells 2 in the battery module during charge / discharge testing and has certain protection logic for judgment.

[0040] like Figure 1 As shown, it also includes charging and discharging lines, which act as carriers for charge transfer, connecting the charger / discharger, the battery main control box, and the battery module. The battery main control box is connected to the charger / discharger and the battery module via the charging and discharging lines, respectively.

[0041] like Figure 2 As shown, the Hall effect acquisition circuit includes a Hall sensor 5, a Hall power supply system, and a Hall output acquisition system. The Hall sensor 5 is connected to both the Hall power supply system and the Hall output acquisition system. In this embodiment, the Hall sensor 5 is a device that can sense the current value in a line and is used to detect the current magnitude in the BMS equalization circuit. The Hall power supply system is a device that provides electrical energy to the internal circuitry of the Hall sensor 5, used to sense changes in the magnetic field and perform logic calculations. The Hall output acquisition system is a device that converts and records the analog signal output by the Hall sensor 5, allowing for visualization and long-term storage of the analog signal, providing key equipment for acquiring the duration and value data of the equalization current.

[0042] like Figure 3 As shown, the Hall power supply system includes a Hall power supply circuit 6 and a DC power supply 7, which are connected to the Hall power supply circuit 6. The Hall power supply circuit 6 is also connected to the Hall sensor 5. The Hall output acquisition system includes a Hall signal acquisition line 8 and a paperless recorder 9, which are connected to the Hall signal acquisition line 8 and the Hall sensor 5.

[0043] Example 2: This example includes a test method for battery balancing function, comprising the following steps:

[0044] The charging and discharging process of the charger is set based on the parameter information of the battery module. The battery module is then subjected to charge and discharge cycle tests based on the charging and discharging process until the preset conditions for activating the battery balancing function are met during the test.

[0045] After the battery balancing function is enabled, the BMS balancing circuit generates current. The change time of the analog signal in the Hall acquisition circuit is collected by the BMS balancing circuit, and the magnitude of the balancing current is calculated. The quality of the battery balancing function is judged based on the change time of the analog signal and the magnitude of the balancing current.

[0046] Specifically, the charging motor, battery control box, and battery module are connected sequentially via charging and discharging lines. The main positive and negative power harnesses of the charging / discharging motor are directly connected to the power input port of the battery control box. The main positive power harness of the power output port of the battery control box is directly connected to the main positive interface of the battery module, and the main negative power harness of the power output port of the battery control box is directly connected to the main positive and negative interfaces of the battery module.

[0047] The charger / discharger sets the charging / discharging process based on the battery module's parameter information, including voltage, power, and time. The battery main control box sets protection information during the charging / discharging process based on the battery module's parameter information, including setting the battery module's total voltage, individual cell voltage, temperature, and overcurrent parameters. The Hall sensor 5 passes through the battery module's voltage acquisition harness 3 and is powered by a ±12V DC power supply 7.

[0048] The change in current causes a change in the magnetic field inside Hall sensor 5. The analog signal output by Hall sensor 5 is connected to paperless recorder 9 through a wire. Paperless recorder 9 selects a preset voltage level and data sampling period to record the analog signal output by Hall sensor 5 in real time. The charger / discharger is then started to charge and discharge the battery module.

[0049] A charge-discharge cycle test was performed on a single battery module via a charge / discharge machine and the battery main control box. In this embodiment, the battery module model is 51.2NESP125, with a voltage operating range of 40V-58.4V, a rated energy of 6.4KW, and a rated charge / discharge power of 1.3KW. The Hall sensor 5 is powered by ±12V@DC, with a signal output range of 0-5V, a current acquisition range of 0-3A, and a minimum accuracy of 0.1mA.

[0050] The charge-discharge cycle test specifically includes the following steps:

[0051] Step S1: The charger discharges the battery module at a rated power of 1.3KW until the total voltage of the battery module reaches 40V or the voltage of a single cell reaches 22.5V, at which point the battery module stops discharging.

[0052] Step S2: Let stand for 30 minutes;

[0053] Step S3: The charger charges the battery module at a rated power of 1.3KW. When the total voltage of the battery module reaches 58.4V or the voltage of a single cell reaches 23.65V, the battery module stops charging.

[0054] Step S4: Let stand for 30 minutes;

[0055] Step S5: The charger discharges the battery module at a rated power of 1.3KW until the total voltage of the battery module reaches 40V or the voltage of a single cell reaches 22.5V, at which point the battery module stops discharging.

[0056] After repeating steps S2 to S5 three times, the charging and discharging process of the battery module ends, and the relevant charging and discharging data is recorded and saved.

[0057] In this embodiment, the analog signal output by Hall sensor 5 is a voltage analog signal. Based on the BMS equalization circuit, the change time of the analog signal in the Hall acquisition circuit is collected, and the magnitude of the equalization current is calculated. Specifically, the following steps are included:

[0058] The equalization current value is calculated based on the voltage analog signal output by the Hall sensor 5 stored in the paperless recorder 9. The specific formula is as follows: I equalization current = (V0 / Vmax)*Imax, where V0 represents the voltage value output by the Hall sensor 5, Vmax represents the maximum output voltage range value of the Hall sensor 5, Imax represents the maximum detection current range value, and I equalization current represents the equalization current value.

[0059] Based on the voltage analog signal output by Hall sensor 5 stored in paperless recorder 9, the duration of significant change in the voltage output value of Hall sensor 5 is calculated to obtain the equalization time. The quality of the battery equalization function is judged based on the equalization current value and the equalization time. The larger the equalization current value or the longer the equalization time, the more obvious the improvement in the consistency performance of the battery module (the voltage difference within the battery module decreases and the charging and discharging capacity increases).

[0060] As another implementation, the Hall sensor 5 can be a Hall sensor 5 whose output signal is an analog current signal. By using the Hall sensor 5 whose output signal is an analog current signal, the data conversion step can be reduced, and the equalized current value can be directly obtained through the paperless recorder 9.

[0061] In another implementation, the Hall sensor 5 can be an open-type Hall sensor 5 or a closed-type Hall sensor 5. If a closed-type Hall sensor 5 is used, the voltage acquisition harness 3 needs to be pre-processed. The pre-processing of the voltage acquisition harness 3 specifically includes the following steps: First, cut the voltage acquisition harness 3, connect the two ends of the voltage acquisition harness 3 to the plug-in terminals, fix the Hall sensor 5, pass the voltage acquisition harness 3 through the Hall sensor 5, and then plug them in to form a complete harness.

[0062] For relevant details, please refer to the description in Example 1.

[0063] Example 3:

[0064] An electronic device includes a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the above-described test method for a battery balancing function.

[0065] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the electronic device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0066] A computer-readable storage medium storing computer instructions that, when executed by a processor, implement the steps of the method in Embodiment 2.

[0067] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0068] This invention is described with reference to flowchart illustrations and / or block diagrams of the method, terminal device (system), and computer program product according to the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0069] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0070] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0071] It should be noted that:

[0072] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of this application. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0073] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0074] Furthermore, it should be noted that the shapes and names of the parts and components described in the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this application are included within the scope of protection of this application. Those skilled in the art to which this application pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of this application or exceed the scope defined by the claims, all of which should fall within the scope of protection of this application.

Claims

1. A testing device for battery balancing function, characterized in that, include: The battery charge / discharge module is used to perform charge / discharge cycle tests until the preset conditions for activating the battery balancing function are met during the test. The BMS equalization circuit is connected to the battery charging and discharging module and is used to collect basic data during the test process, as well as to realize energy transfer or energy dissipation between individual cells to generate current. A Hall effect acquisition circuit is connected to the BMS equalization circuit. It is used to acquire the change time of the analog signal based on the BMS equalization circuit and calculate the magnitude of the equalization current. The quality of the battery equalization function is judged based on the change time of the analog signal and the magnitude of the equalization current. The Hall acquisition circuit includes a Hall sensor, a Hall power supply system, and a Hall output acquisition system. The Hall sensor is connected to both the Hall power supply system and the Hall output acquisition system. The Hall sensor is used to detect the current magnitude in the BMS equalization circuit. The Hall power supply system provides electrical energy to the internal circuitry of the Hall sensor, which is used to sense changes in the magnetic field and perform logical calculations; the Hall output acquisition system converts and records the analog signal output by the Hall sensor, visualizes and stores the analog signal of the Hall sensor for a long time, and provides data on the duration and value of the acquisition equalization current. The device employs a battery balancing function testing method, including the following steps: The charging and discharging process of the charger is set based on the parameter information of the battery module. The battery module is then subjected to charge and discharge cycle test based on the charging and discharging process until the preset conditions for activating the battery balancing function are met during the test. After the battery balancing function is enabled, the BMS balancing circuit generates current. The charge-discharge cycle test includes the following steps: Step S1: The charger discharges the battery module at a rated power of 1.3KW until the total voltage of the battery module reaches 40V or the voltage of a single cell reaches 22.5V, at which point the battery module stops discharging. Step S2: Let stand for 30 minutes; Step S3: The charger charges the battery module at a rated power of 1.3KW. When the total voltage of the battery module reaches 58.4V or the voltage of a single cell reaches 23.65V, the battery module stops charging. Step S4: Let stand for 30 minutes; Step S5: The charger discharges the battery module at a rated power of 1.3KW until the total voltage of the battery module reaches 40V or the voltage of a single cell reaches 22.5V, at which point the battery module stops discharging. After repeating steps S2 to S5 three times, the charging and discharging process of the battery module ends, and the relevant charging and discharging data is recorded and saved.

2. The battery balancing function testing device as described in claim 1, characterized in that, The battery charging and discharging module includes a charging and discharging machine and a battery main control box. The charging and discharging machine and the battery main control box are connected. The charging and discharging machine is used to preset multiple charging and discharging modes, and the battery main control box is used to protect the battery module.

3. The battery balancing function testing device as described in claim 1, characterized in that, The BMS equalization circuit includes a battery module and a battery management system. The battery module and the battery management system are connected. The battery module is used to store electrical energy, and the battery management system is used to collect basic data during the test process.

4. The battery balancing function testing device as described in claim 3, characterized in that, The battery module includes multiple individual battery cells, multiple voltage acquisition harnesses, and multiple welded aluminum busbars, which are respectively connected to the individual battery cells and the voltage acquisition harnesses.

5. The battery balancing function testing device as described in claim 1, characterized in that, The Hall power supply system includes a Hall power supply circuit and a DC power supply. The DC power supply is connected to the Hall power supply circuit, and the Hall power supply circuit is connected to the Hall sensor.

6. The battery balancing function testing device as described in claim 1, characterized in that, The Hall output acquisition system includes a Hall signal acquisition line and a paperless recorder, wherein the paperless recorder and the Hall signal acquisition line are connected to the Hall sensor.

7. An electronic device, characterized in that, It includes a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement a test method for a battery balancing function as described in claim 1.

8. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in claim 1.

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