Automatic equalization testing device for battery module

Abstract

The utility model discloses an automatic equalization testing device for a battery module, and belongs to the technical field of batteries. Comprising a first collector, the positive electrode end of the first collector is connected with the positive electrode end of a battery module, and the negative electrode end of the first collector is connected with the negative electrode end of the battery module; the second collector is connected with a wire harness connector; and the first collector, the second collector and the judgment component for automatic equalization are respectively connected with a charging and discharging device. The technical scheme has the beneficial effects that the labor cost can be saved, the utilization rate of the battery can be effectively improved, the equalization operation is automatically judged through the equalization device, the cycle life of the module can be prolonged, and the cost of replacing a new module or a new battery pack is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an automatic equalization test device for battery modules. Background Art

[0002] The new energy vehicle industry is one of my country's emerging industries and is also the only way for my country to become an automobile power. Power batteries are green batteries with a series of excellent properties. They have been widely used in passenger cars, commercial vehicles and other fields. Power batteries are important components of electric vehicles. Their life cycle performance directly affects the vehicle's endurance. Therefore, how to extend the life of power batteries is particularly important.

[0003] In the prior art, when a power battery system or a power battery module is used or shelved for a long time, the charge and discharge depth of individual cells in the module will be insufficient, resulting in poor consistency of battery voltage in the module and inability to fully exert the performance of other batteries in the module. However, the active balancing of the BMS (Battery Management System) itself cannot complete the balancing of the battery pack in a short period of time, resulting in a reduction in the utilization rate, service life, safety performance, etc. of the grouped batteries. Considering economic needs, the battery module will be removed and forced balancing will be performed with an external device to keep the voltage deviation of the battery system or module within the expected range. However, the balancing equipment currently used requires manual program setting and is manually checked and judged and balanced at all times, so the balancing efficiency is low. In addition, due to the uncertainty of manual program writing and judgment, the balancing result of the module will also be biased, affecting the balancing result and thus affecting the life cycle of the module. Utility Model Content

[0004] The purpose of the utility model is to provide a battery module automatic equalization test device to solve the above technical problems;

[0005] A battery module automatic equalization test device, comprising:

[0006] A first collector, wherein a positive terminal of the first collector is connected to a positive terminal of a battery module, and a negative terminal of the first collector is connected to a negative terminal of the battery module;

[0007] a second collector, the second collector being connected to a wire harness connector;

[0008] The first collector, the second collector and the determination component for automatic balancing are respectively connected to a charging and discharging device.

[0009] Preferably, the determination component comprises a first determiner for distinguishing battery materials, a second determiner for automatically starting balancing, and a third determiner for automatically terminating balancing.

[0010] Preferably, the battery module comprises a plurality of battery strings, and the plurality of battery strings are connected in series.

[0011] Preferably, each of the batteries comprises two cells connected in parallel.

[0012] Preferably, the wiring harness connector is welded to the integrated cover plate of the battery module.

[0013] Preferably, the second collector is used to collect the voltage of a single string of batteries.

[0014] Preferably, it further comprises a thermistor, one end of the thermistor is connected to the battery module, and the other end of the thermistor is connected to the wiring harness connector, and the second collector is also used to collect the temperature of the battery module.

[0015] Preferably, the thermistor is a negative temperature coefficient thermistor.

[0016] Preferably, the first collector is used to collect the total pressure of the battery module.

[0017] Preferably, the battery is a ternary battery or a lithium iron battery.

[0018] The beneficial effects of the utility model include: it can save labor costs, and can effectively improve the utilization rate of the battery. By automatically determining and performing the balancing operation through the balancing device, the cycle life of the module can be increased, and the cost of replacing a new module or battery pack can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a connection diagram of the battery module automatic equalization device of the utility model;

[0020] Figure 2 The utility model is a flow chart of the automatic balancing method of battery modules.

[0021] In the attached drawings: 1. first collector; 2. second collector; 3. first determiner; 4. second determiner; 5. third determiner; 6. wiring harness connector; 7. battery module; 8. charging and discharging device; 9. thermistor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0025] A battery module automatic equalization test device, such as Figure 1 As shown, including,

[0026] A first collector 1, wherein the positive terminal of the first collector 1 is connected to the positive terminal of a battery module 7, and the negative terminal of the first collector 1 is connected to the negative terminal of the battery module 7;

[0027] A second collector 2, the second collector 2 is connected to a wire harness connector 6;

[0028] The first collector 1 , the second collector 2 and the determination component for automatic balancing are respectively connected to a charging and discharging device 8 .

[0029] Specifically, the utility model provides a battery module automatic balancing test device, which is mainly used for balancing battery packs. The balancing device automatically determines and performs balancing operations, avoiding manual operations, improving the accuracy and efficiency of battery module 7 balancing, thereby improving the overall performance of the power battery module 7, effectively extending the battery life, and reducing the replacement cost of the battery module 7.

[0030] Further specifically, the first collector 1 is a high-voltage collector, specifically a voltage sensor, which is used to collect the voltage signal of the battery module 7. The second collector 2 is a single-string voltage and temperature collector, which integrates a voltage sensor and a temperature sensor, and is used to collect the voltage and temperature of a single string of batteries. The wiring harness connector 6 is a low-voltage wiring harness connector. The high-voltage collector is connected to the battery module 7 through a positive current I+ and a negative current I-. The single-string voltage and temperature collector collects multiple voltage data and resistance temperature data through a low-voltage wiring harness connector for automatic balancing. The charging and discharging device is a test cabinet, which can ensure safe and effective charging and discharging of the battery.

[0031] In a preferred embodiment, the determination component includes a first determiner 3 for distinguishing battery materials, a second determiner 4 for automatically starting equalization, and a third determiner 5 for automatically terminating equalization.

[0032] Specifically, the determiner makes a determination and sends a balancing instruction through software. The first determiner 3 is responsible for automatically calculating the charging current and starting constant current charging according to the material and model of the battery module 7; the second determiner 4 is responsible for determining whether the balancing requirements are met based on the voltage, temperature and calculated pressure difference collected by the low-voltage wiring harness. If so, balancing will start automatically, that is, the module is charged with a constant small current, and the highest single cell voltage value before charging is started is cut off at this step; after charging is cut off, the third determiner 5 is responsible for judging again based on the voltage difference after standing to confirm whether the balancing termination condition is met. If the termination condition is met, the balancing operation is completed, avoiding inaccurate determination results due to manual participation and improving the efficiency and accuracy of balancing.

[0033] In a preferred embodiment, the battery module 7 includes multiple battery strings, which are connected in series; each battery includes two parallel-connected battery cells.

[0034] Specifically, the battery module 7 is balanced by the automatic balancing device, thereby increasing the discharge depth of some cells, enhancing the consistency of cells in the module, and extending the cycle life of the module.

[0035] In a preferred embodiment, the wiring harness connector 6 is welded to the integrated cover plate of the battery module 7 .

[0036] Specifically, the wiring harness connector 6 is welded to the integrated cover plate of the battery module 7, providing a reliable electrical connection for the automatic balancing test device, ensuring the stability of signal transmission and power supply between the battery module 7 and the balancing device, thereby ensuring the accuracy and efficiency of the balancing operation of the automatic balancing test device.

[0037] In a preferred embodiment, the second collector 2 is used to collect the voltage of a single string of batteries.

[0038] Specifically, it helps the automatic balancing test device to monitor and obtain the voltage information of each battery string in real time, so as to automatically determine the status of each battery string and judge whether corresponding balancing operation is needed according to the battery voltage situation, thereby avoiding the subjective judgment and error of manual operation and improving the accuracy and efficiency of balancing.

[0039] In a preferred embodiment, it further includes a thermistor 9 , one end of the thermistor 9 is connected to the battery module 7 , and the other end of the thermistor 9 is connected to the wiring harness connector 6 . The second collector 2 is also used to collect the temperature of the battery module 7 .

[0040] In a preferred embodiment, the thermistor 9 is a negative temperature coefficient thermistor (NTC).

[0041] Specifically, the thermistor 9 can accurately monitor the temperature of the battery module and ensure the effectiveness of the balancing operation.

[0042] In a preferred embodiment, the first collector 1 is used to collect the total pressure of the battery module 7 .

[0043] Specifically, by monitoring the total pressure and the total pressure status of the module in real time, the safety of the balanced operation can be ensured.

[0044] In a preferred embodiment, the battery is a ternary battery or a lithium iron battery.

[0045] Reference Figure 1 , Figure 2 , Figure 2 This is a flow chart of an equalization method of a battery module automatic equalization test device of the utility model;

[0046] After connecting the high and low voltage harnesses of the battery module 7 to the automatic equalization test device, select the module automatic equalization option, and then select the battery material (ternary / lithium iron) and module model;

[0047] Specifically, if the battery material is lithium iron, it will be charged to 100% SOC at C / 3 until the battery is fully charged, and then left to stand for 2 hours; the second determiner 4 performs the first determination, and if the temperature of the negative temperature coefficient thermistor (NTC) is less than 55°C, the maximum voltage V max If the maximum voltage difference is less than 3.65V and the maximum voltage difference is greater than or equal to 100mV, and the above three conditions are met at the same time, the balancing mode is turned on; otherwise, it is left to stand for 1 hour before making another judgment; after the automatic balancing is turned on, the third determiner 5 makes a second judgment, that is, judging whether the maximum voltage difference is less than 100mV, if so, the automatic balancing is ended, if not, the automatic balancing is turned on again until the maximum voltage difference is less than 100mV.

[0048] Specifically, if the battery material is ternary, it will be charged to 100% SOC at C / 5 until the battery is fully charged, and then left to stand for 2 hours; the second determiner 4 performs the first determination, and if the temperature of the negative temperature coefficient thermistor (NTC) is less than 55°C, the maximum voltage V max If the maximum voltage difference is less than 4.25V and the maximum voltage difference is greater than or equal to 100mV, and the above three conditions are met at the same time, the balancing mode is turned on; otherwise, it is left to stand for 1 hour before making another judgment; after the automatic balancing is turned on, the third determiner 5 makes a second judgment, that is, judging whether the maximum voltage difference is less than 100mV, if so, the automatic balancing is ended, if not, the automatic balancing is turned on again until the maximum voltage difference is less than 100mV.

[0049] In summary, the present application provides a battery module automatic balancing test device, which automatically determines the balancing operation through the balancing device, improves the accuracy and efficiency of module balancing, improves the overall performance of the power battery module 7, and can also effectively extend the battery life and reduce the replacement cost of the battery system or module.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module automatic equalization test device, characterized in that: include, A first collector (1), wherein a positive terminal of the first collector (1) is connected to a positive terminal of a battery module (7), and a negative terminal of the first collector (1) is connected to a negative terminal of the battery module (7); A second collector (2), the second collector (2) being connected to a wire harness connector (6); The first collector (1), the second collector (2) and the determination component for automatic balancing are respectively connected to a charging and discharging device (8).

2. The battery module automatic equalization test device according to claim 1, characterized in that: The determination component comprises a first determiner (3) for distinguishing battery materials, a second determiner (4) for automatically starting equalization, and a third determiner (5) for automatically terminating equalization.

3. The battery module automatic equalization test device according to claim 1, characterized in that: The battery module (7) comprises a plurality of battery strings, wherein the plurality of battery strings are connected in series.

4. The battery module automatic equalization test device according to claim 3, characterized in that: Each of the batteries comprises two cells connected in parallel.

5. The battery module automatic equalization test device according to claim 1, characterized in that: The wiring harness connector (6) is welded to the integrated cover plate of the battery module (7).

6. The battery module automatic equalization test device according to claim 4, characterized in that: The second collector (2) is used to collect the voltage of a single string of batteries.

7. The battery module automatic equalization test device according to claim 1, characterized in that: It also comprises a thermistor (9), one end of the thermistor (9) is connected to the battery module (7), the other end of the thermistor (9) is connected to the wiring harness connector (6), and the second collector (2) is also used to collect the temperature of the battery module (7).

8. The battery module automatic equalization test device according to claim 7, characterized in that: The thermistor (9) is a negative temperature coefficient thermistor.

9. The battery module automatic equalization test device according to claim 1, characterized in that: The first collector (1) is used to collect the total pressure of the battery module (7).

10. The battery module automatic equalization test device according to claim 4, characterized in that: The battery is a ternary battery or a lithium iron battery.

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