Battery pack aging test method and device, electronic equipment and medium

Abstract

The invention provides a battery pack aging test method and device, electronic equipment and a medium, and the method comprises the steps that a test system is controlled to execute a preset composite test spectrum on a battery pack, the test system comprises charging and discharging equipment, vibration equipment and temperature control equipment, and the preset composite test spectrum comprises an electric stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; controlling the charging and discharging equipment to apply a current load corresponding to the electric stress spectrum to the battery pack, and acquiring real-time current data of the battery pack; and according to a comparison result of the real-time current data and a preset current threshold value, determining a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum, so as to control the vibration equipment and the temperature control equipment to execute the aging test corresponding to the comparison result on the battery pack according to the test strategy. According to the invention, the aging test is accelerated, and the potential failure of the battery pack can be more truly and quickly exposed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery pack aging test method and device, electronic equipment and medium. BACKGROUND

[0002] The reliability test of the current power battery pack generally follows various national standards or enterprise standards, and these standards mostly use single stress sequential application or simple cycle test methods. For example, first, a vibration test for a specified duration is performed, then a high-low temperature cycle test is performed, and finally, a charge-discharge cycle test is performed. The limitations of this method are increasingly prominent: first, it fails to truly simulate the harsh working conditions of the complex interweaving and simultaneous action of electrical, thermal and mechanical stresses of the battery pack in real vehicle operation. When the vehicle is on a bumpy road (mechanical vibration) and discharges a large current (electrical stress), the battery cell heats up (thermal stress) at the same time. This stress coupling effect can accelerate material fatigue, connection loosening and other failures, and sequential testing cannot effectively trigger and expose such defects. Secondly, the traditional test cycle is long, which cannot meet the needs of the rapid iteration of the research and development rhythm, and finally, the actual life predicted based on the results of single stress testing is often overly optimistic, leading to potential quality risks flowing into the market. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a battery pack aging test method and device, electronic equipment and medium, which aims to overcome at least one of the above-mentioned defects.

[0004] In a first aspect, the present application provides a battery pack aging test method, which comprises: controlling a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device and a temperature control device, and the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; controlling the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack, and acquiring real-time current data of the battery pack; determining a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to the comparison result of the real-time current data and a preset current threshold, so as to control the vibration device and the temperature control device to perform an aging test corresponding to the comparison result on the battery pack according to the test strategy.

[0005] In a possible implementation, the comparison result includes a first comparison result, the first comparison result indicating that the real-time current value of the battery pack is not less than a preset current threshold, and the vibration device and the temperature control device are controlled to perform an aging test corresponding to the first comparison result on the battery pack in the following manner: the vibration device is controlled to vibrate and excite the battery pack at a preset high-intensity spectrum segment in the mechanical stress spectrum, and the temperature control device is controlled to adjust the ambient temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the ambient temperature value in a first preset temperature interval, the first preset temperature interval indicating a temperature interval not lower than a normal temperature.

[0006] In a possible implementation, the comparison result further includes a second comparison result, the second comparison result indicating that the real-time current value of the battery pack is less than a preset current threshold, and the vibration device and the temperature control device are controlled to perform an aging test corresponding to the second comparison result on the battery pack in the following manner: the vibration device is controlled to vibrate and excite the battery pack at a preset low-intensity spectrum segment in the mechanical stress spectrum, and the temperature control device is controlled to adjust the ambient temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the ambient temperature value in a second preset temperature interval, the second preset temperature interval indicating a temperature interval lower than a normal temperature.

[0007] In a possible implementation, the test system further includes an environmental test chamber, and a test cavity is formed in the environmental test chamber, and the temperature value in the test cavity is the ambient temperature value.

[0008] In a possible implementation, the method further includes: cyclically performing the preset composite test spectrum, and ending the test when the capacity of the battery pack attenuates to a preset capacity threshold; analyzing a failure mode exposed by the battery pack in the test, and dividing the battery pack into different life grades according to a number of test cycles experienced by the capacity attenuation to the preset capacity threshold.

[0009] In a possible implementation, the mechanical stress spectrum includes a three-axis random vibration spectrum compiled based on real vehicle road data.

[0010] In a second aspect, the present application provides a battery pack aging test device, the device comprising: an execution module configured to control a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device, and a temperature control device, the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum, and a mechanical stress spectrum; an acquisition module configured to control the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack, and acquire real-time current data of the battery pack; and a control module configured to determine a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to a comparison result of the real-time current data and a preset current threshold, and control the vibration device and the temperature control device to perform the aging test corresponding to the comparison result on the battery pack according to the test strategy.

[0011] In a possible implementation, the comparison result comprises a first comparison result indicating that the real-time current value of the battery pack is not less than the preset current threshold, and the control module is further configured to control the vibration device to perform vibration excitation on the battery pack at a preset high-intensity spectrum segment in the mechanical stress spectrum, and control the temperature control device to adjust an ambient temperature value according to a temperature setting value of the thermal stress spectrum at a current time, so as to control the ambient temperature value in a first preset temperature interval, the first preset temperature interval indicating a temperature interval not lower than a normal temperature.

[0012] In a third aspect, the present application further provides an electronic device, comprising: a processor, a memory, and a bus, the memory storing machine readable instructions executable by the processor, the processor and the memory communicating through the bus when the electronic device is running, and the machine readable instructions being executed by the processor to perform the steps of the above method.

[0013] In a fourth aspect, the present application further provides a computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being executed by a processor to perform the steps of the above method.

[0014] The application provides a battery pack aging test method and device, electronic equipment and a medium, wherein the method comprises: controlling a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device and a temperature control device, and the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; controlling the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack and acquiring real-time current data of the battery pack; determining a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to a comparison result of the real-time current data and a preset current threshold, so as to control the vibration device and the temperature control device to perform the aging test corresponding to the comparison result on the battery pack according to the test strategy. Through the application, the aging test is accelerated, and the potential failure of the battery pack can be exposed more realistically and quickly.

[0015] In order to make the above objectives, features and advantages of the present application more apparent, the following will describe a preferred embodiment in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 A flowchart of a battery pack aging test method provided by the embodiments of the present application; Figure 2 A flowchart of test analysis provided by the embodiments of the present application; Figure 3 A structural schematic diagram of a battery pack aging test device provided by the embodiments of the present application; Figure 4 A structural schematic diagram of an electronic equipment provided by the embodiments of the present application. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, every other embodiment obtained by a person skilled in the art without creative work belongs to the scope of protection of the present application.

[0019] Firstly, the application scenarios applicable to the present application are introduced. The present application can be applied to the field of battery technology.

[0020] It is found through research that the reliability test of the current power battery pack generally follows various national standards (such as GB / T31467) or enterprise standards, and these standards mostly use single stress sequential application or simple cycle test methods. For example, first, a vibration test for a specified duration is performed, then a high-low temperature cycle test is performed, and finally a charge-discharge cycle test is performed. The limitations of this kind of method are increasingly prominent: first, it fails to truly simulate the harsh working conditions of the complex interweaving and synchronous action of electrical, thermal and mechanical stresses of the battery pack in real vehicle operation. When the vehicle is on a bumpy road (mechanical vibration) and discharges a large current (electrical stress), the battery cell heats up (thermal stress) at the same time. This stress coupling effect will accelerate material fatigue, connection loosening and other failures, and sequential testing cannot effectively trigger and expose such defects. Secondly, the traditional test cycle is long, which cannot meet the needs of the rapid iteration of the research and development rhythm. Finally, the actual life predicted based on the results of single stress testing is often overly optimistic, leading to potential quality risks flowing into the market.

[0021] Based on this, the embodiments of the present application provide a battery pack aging test method, device, electronic equipment and medium, aiming to develop an accelerated aging test method that can more truly and quickly expose the potential failure of the battery pack.

[0022] Please refer to Figure 1 , Figure 1 The flowchart of the battery pack aging test method provided by the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, the battery pack aging test method provided by the embodiments of the present application comprises the following steps. Figure 1 S101, controlling a test system to perform a preset composite test spectrum on the battery pack.

[0023] ​Here, the test system includes an environmental test chamber, a charge-discharge device, a vibration device, and a temperature control device. The environmental test chamber forms a test cavity. The temperature value in the test cavity is an environmental temperature value. Specifically, the environmental test chamber is a sealed box body for precisely controlling the internal climate to place the battery pack to simulate the external thermal environment in which the battery pack is located. The temperature control system is a device for controlling the environmental temperature in the test cavity, providing a range of -40°C to +85°C, covering the extreme use temperature of vehicles in most regions. The vibration system is a device for applying mechanical vibration to the battery pack. Three-axis random vibration refers to simultaneously simulating the front, rear, left, right, and up-down directions, and the waveform is irregular (random). This vibration is closer to the real road excitation than single-direction or regular vibration. The charge-discharge device is a device for charging and discharging the battery pack, which can simulate current and voltage profiles and work according to the preset current and voltage change curve simulating real vehicle driving (such as acceleration, deceleration, and cruising), rather than simple constant current charging and discharging.

[0024] The preset composite test spectrum includes an electrical stress spectrum, a thermal stress spectrum, and a mechanical stress spectrum. The mechanical stress spectrum includes a three-axis random vibration spectrum based on real vehicle road data.

[0025] Specifically, the preset composite test spectrum is a predefined instruction set that integrates three stress change rules and their interaction relationships. It specifies when and how to apply which stress, which is the basis for realizing synchronous coupling testing.

[0026] Among them, the electrical stress spectrum defines the current and voltage change curve of the battery pack over time during the test (such as the curve based on the WLTC working condition strengthening), the thermal stress spectrum defines the environmental temperature change curve in the test cavity over time, and the mechanical stress spectrum defines the vibration intensity and time change curve. The mechanical stress spectrum is derived from data collected during real vehicle driving on rough roads, ensuring the authenticity and representativeness of the test vibration conditions.

[0027] As an example, this application is not simply stress superposition, but scientific coupling rules are designed, specifically: Coupling of electrical stress and mechanical stress: In the test spectrum, when the charge-discharge device performs a large current discharge or energy recovery (high rate pulse) working condition, the vibration system is simultaneously commanded to apply a high-intensity random vibration spectrum. This simulates the most severe working condition of the vehicle accelerating or braking while passing through a bumpy road, effectively testing the mechanical fatigue of electrical connections and the stability of electrical contacts.

[0028] Coupling of electrical and thermal stress: During the phase of continuous high-power charging and discharging, which leads to high heat generation from the battery pack itself, the ambient temperature is not constant but set to a high-temperature environment (e.g., 45°C), exacerbating the heat dissipation pressure and testing the extreme performance of the thermal management system. During the low-current resting phase, a low-temperature environment (e.g., -10°C) is set to test the effectiveness of the BMS's low-temperature self-heating function.

[0029] Coupling of mechanical stress and thermal stress: When the ambient temperature changes rapidly from high to low, maintain a certain intensity of background vibration to assess the internal stress of the battery pack structural components due to the different coefficients of thermal expansion and contraction of different materials, as well as the reliability of the mechanical connection under this stress.

[0030] S102. Control the charging and discharging equipment to apply a current load corresponding to the electrical stress spectrum to the battery pack, and obtain the real-time current data of the battery pack.

[0031] S103. Based on the comparison results between real-time current data and preset current threshold, determine the corresponding test strategy from the thermal stress spectrum and mechanical stress spectrum, and control the vibration equipment and temperature control equipment to perform the aging test corresponding to the comparison results on the battery pack according to the test strategy.

[0032] Here, the preset current threshold is used to determine whether the battery pack is currently in a high-rate pulse state or a low-current / quiet state.

[0033] In a preferred embodiment of this application, the comparison result includes a first comparison result, which indicates that the real-time current value of the battery pack is not less than a preset current threshold. The aging test corresponding to the first comparison result is performed on the battery pack by controlling the vibration device and the temperature control device in the following manner: the vibration device is controlled to vibrate the battery pack with a preset high-intensity spectrum in the mechanical stress spectrum, and the temperature control device is controlled to adjust the ambient temperature value according to the temperature setting value of the thermal stress spectrum at the current moment, so as to control the ambient temperature value within a first preset temperature range, which indicates a temperature range not lower than the normal temperature.

[0034] Specifically, the high-intensity segment in the mechanical stress spectrum is used to simulate harsh road conditions, and the first preset temperature range refers to a high temperature between 40-45°C, which is used to match the high current.

[0035] In a preferred example of the present application, the comparison result further includes a second comparison result indicating that the real-time current value of the battery pack is less than a preset current threshold, wherein the vibration device and the temperature control device are controlled to perform an aging test corresponding to the second comparison result on the battery pack in the following manner: the vibration device is controlled to vibrate the battery pack with a preset low-intensity spectrum segment in the mechanical stress spectrum, and the temperature control device is controlled to adjust the ambient temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the ambient temperature value in a second preset temperature interval, the second preset temperature interval indicating a temperature interval lower than the normal temperature.

[0036] Specifically, the low-intensity segment in the mechanical stress spectrum simulates smooth road conditions or background vibration, and the second preset temperature interval is a low temperature between -10°C and -20°C, which is used to cooperate with small current static.

[0037] Please refer to Figure 2 , Figure 2 the flowchart of the test analysis provided by the embodiments of the present application. As shown in Figure 2 , the test analysis provided by the embodiments of the present application includes: S201, a preset composite test spectrum is cyclically executed, and the test is ended when the capacity of the battery pack decays to a preset capacity threshold.

[0038] Specifically, each execution is called a "cycle" or "one equivalent day", and the preset capacity threshold refers to a preset capacity value indicating the end of the life of the battery pack, which is preferably 80% of the rated capacity. That is, when the total amount of electricity that can be discharged by the battery pack after being fully charged decreases to 80% of its fresh state, it is considered that it cannot meet the core requirements of vehicle use. When the capacity is determined to have decayed to 80%, the test is automatically stopped.

[0039] S202, analyzing the failure modes exposed by the battery pack during the test, and dividing the life grade of the battery pack according to the number of test cycles experienced when the capacity decays to the preset capacity threshold.

[0040] After the test is completed, the battery pack is disassembled and deeply detected to find and determine the specific damage forms inside it.

[0041] The specific damage forms can include: microscopic cracks of Busbar laser welding points (caused by electro-mechanical coupling stress), stress whitening or loosening of high-voltage connectors (caused by thermal-mechanical coupling stress), slight leakage of cooling pipe joints (caused by thermal-mechanical coupling stress), aging of separators inside the battery cell, shedding of active materials, etc. (caused by electro-thermal-mechanical comprehensive stress).

[0042] Then, a grading system can be established according to the life termination cycle number, and the quality grading and value evaluation of the battery pack are performed.

[0043] Example One.

[0044] The embodiment of the application provides a specific implementation method of battery pack aging test.

[0045] The test is carried out for a ternary lithium power battery pack with a rated capacity of 80 Ah and a rated voltage of 400 V, and the target is to simulate the whole vehicle aging process equivalent to 8 years or 300,000 kilometers within 600 hours.

[0046] First, a 24-hour preset composite test spectrum is constructed, which will be executed cyclically until the test is terminated. Specifically, the WLTC working condition curve compressed and strengthened is imported as an electrical stress spectrum, which contains 3C peak discharge and 2C regenerative braking pulse; a 24-hour environmental temperature change curve simulating the day-night temperature difference is designed as a thermal stress spectrum, ranging from -20°C to 45°C; and a three-axis random vibration spectrum containing high-intensity and low-intensity paragraphs based on real vehicle bad road data is prepared as a mechanical stress spectrum.

[0047] The thermal stress spectrum is specifically a 24-hour environmental temperature change curve: 00:00-06:00: -20°C low-temperature standing (simulating cold night environment). 06:00-08:00: linearly heated to 25°C (simulating early morning). 08:00-18:00: fluctuating between 25°C and 45°C (simulating daytime driving, the temperature rises due to sunshine and self-heating). 18:00-24:00: linearly cooled to -20°C.

[0048] The core of the test is stress coupling and synchronous control, strictly following the preset coupling logic to synchronize the driving of the battery pack with the three stress spectra. When the electrical stress spectrum is in the peak discharge or recovery period between 08:00 and 18:00, the vibration equipment will be triggered to execute the high-intensity vibration spectrum, and the environmental temperature will be controlled in the high-temperature interval of 40-45°C. Conversely, when the electrical stress spectrum is in the small current or standing period, the system controls the vibration equipment to execute the low-intensity background vibration spectrum, and sets the environmental temperature according to the thermal stress spectrum in the corresponding period (such as the low-temperature standing stage of 00:00-06:00 keeps the temperature at -20°C). In the test execution and monitoring stage, the battery pack is fixed in the test box and connected with all the equipment, the system automatically executes the 24-hour cycle spectrum after starting, continuously collects the module voltage, temperature and vibration acceleration data at a frequency of 10 Hz, and performs a standardized capacity calibration every 50 cycles to accurately draw the capacity decay curve.

[0049] After about 300 cycles (equivalent to 7200 hours) of testing, the battery pack capacity decays to 80% of the initial capacity, marking the achievement of the test target. Analysis of the test results shows that this method can effectively expose potential defects that are difficult to find in traditional single stress or sequential stress tests. Through the disassembly inspection of the battery pack after testing, the unique failure modes caused by the coupling of multiple stresses can be accurately located, such as the micro-cracks found in the Busbar welding points of the module area corresponding to the coupling period of high-intensity vibration and high temperature, or the stress whitening of high-voltage connectors caused by the combined action of low temperature and vibration. These results provide direct and accurate basis for the design improvement of the battery pack, and verify the effectiveness of the test method in quickly and truly evaluating the system-level reliability of the battery pack.

[0050] Compared with the battery pack aging test method in the prior art, the application defines the change curves of the electric stress, thermal stress and mechanical stress on the time axis and the coupling rules by constructing a composite test spectrum; synchronously controls the charging and discharging equipment, the temperature control equipment and the vibration equipment to apply the electric, thermal and mechanical stresses to the battery pack according to the composite test spectrum, so as to realize the following technical effects: (1) The failure modes that may occur in the battery pack in real use, such as the fatigue fracture of the Busbar welding points caused by vibration and the insulation aging under the combined action of high temperature and current impact, can be more accurately reproduced and excited.

[0051] (2) The acceleration effect is good, the cycle is short, and the severe composite stress conditions can achieve or even exceed the aging effect of long-time sequential test or single test in a shorter test time, greatly shortening the product verification period and accelerating the research and development and marketing speed.

[0052] (3) The life data (such as the number of cycles required to decay to 80% capacity) obtained based on the test method has higher correlation with the real vehicle running data, and can be used to establish a more accurate life prediction model, providing a solid data basis for product warranty and reliability evaluation.

[0053] (4) The method not only tests the battery cell, but also comprehensively tests the system-level reliability of the battery pack, including the matching durability of the BMS function, the connector, the wire harness, the cooling system, the structural part and the like under complex environment.

[0054] Based on the same inventive concept, the application embodiments also provide a battery pack aging test device corresponding to the battery pack aging test method. Since the principle of solving problems in the device of the application embodiments is similar to the above-mentioned battery pack aging test method of the application embodiments, the implementation of the device can be referred to the implementation of the method, and the repeated parts will not be described here.

[0055] Please refer to Figure 3 ,Figure 3 A structural schematic diagram of a battery pack aging test device provided by an embodiment of the present application. As shown in Figure 3 The battery pack aging test device 300 comprises: An execution module 301, configured to control a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device and a temperature control device, and the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; An acquisition module 302, configured to control the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack, and acquire real-time current data of the battery pack; A control module 303, configured to determine a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to a comparison result of the real-time current data and a preset current threshold, so as to control the vibration device and the temperature control device to perform the aging test corresponding to the comparison result on the battery pack according to the test strategy.

[0056] Please refer to Figure 4 , Figure 4 A structural schematic diagram of an electronic device provided by an embodiment of the present application. As shown in Figure 4 The electronic device comprises a processor 410, a memory 420 and a bus 430.

[0057] The memory 420 stores machine readable instructions executable by the processor 410, when the electronic device is running, the processor 410 and the memory 420 communicate through the bus 430, the machine readable instructions executed by the processor 410 can execute the steps of the above method, for specific implementation, please refer to the method embodiment, which will not be repeated here.

[0058] The present application also provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is run by the processor can execute the steps of the above method, for specific implementation, please refer to the method embodiment, which will not be repeated here.

[0059] Those skilled in the art can clearly understand that, for the convenience and brevity of the above description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

[0060] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. The described device embodiments are merely schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the among different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0061] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0062] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit.

[0063] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that make essential contributions to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0064] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any skilled person in the art can still modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features, within the technical scope disclosed by the present application. The modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery pack aging test method, characterized by, The method comprises: controlling a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device and a temperature control device, the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; controlling the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack, and acquiring real-time current data of the battery pack; determining a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to a comparison result of the real-time current data and a preset current threshold, so as to control the vibration device and the temperature control device to perform an aging test corresponding to the comparison result according to the test strategy.

2. The method of claim 1, wherein, The comparison result comprises a first comparison result, the first comparison result indicating that the real-time current value of the battery pack is not less than the preset current threshold, wherein the vibration device and the temperature control device are controlled to perform the aging test corresponding to the first comparison result by: controlling the vibration device to vibrate and excite the battery pack at a preset high-intensity spectrum segment in the mechanical stress spectrum, and controlling the temperature control device to adjust the environmental temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the environmental temperature value within a first preset temperature interval, the first preset temperature interval indicating a temperature interval not lower than normal temperature.

3. The method of claim 2, wherein, The comparison result further comprises a second comparison result, the second comparison result indicating that the real-time current value of the battery pack is less than the preset current threshold, wherein the vibration device and the temperature control device are controlled to perform the aging test corresponding to the second comparison result by: controlling the vibration device to vibrate and excite the battery pack at a preset low-intensity spectrum segment in the mechanical stress spectrum, and controlling the temperature control device to adjust the environmental temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the environmental temperature value within a second preset temperature interval, the second preset temperature interval indicating a temperature interval lower than normal temperature.

4. The method of claim 3, wherein, The test system further comprises an environmental test chamber, and a test cavity is formed in the environmental test chamber, and the temperature value in the test cavity is the environmental temperature value.

5. The method of claim 1, wherein, Further comprising: cyclically performing the preset composite test spectrum, and ending the test when the capacity of the battery pack attenuates to a preset capacity threshold; analyzing the failure mode exposed in the test of the battery pack, and dividing the life level of the battery pack according to the number of test cycles experienced when the capacity attenuates to the preset capacity threshold.

6. The method of claim 1, wherein, The mechanical stress spectrum comprises a three-axis random vibration spectrum compiled based on real vehicle road data.

7. A battery pack aging test apparatus characterized by comprising: The device comprises: an execution module configured to control a test system to perform a preset composite test spectrum on a battery pack, the test system comprising a charge-discharge device, a vibration device and a temperature control device, the preset composite test spectrum comprising an electrical stress spectrum, a thermal stress spectrum and a mechanical stress spectrum; an acquisition module configured to control the charge-discharge device to apply a current load corresponding to the electrical stress spectrum to the battery pack, and acquire real-time current data of the battery pack; The control module is configured to determine a corresponding test strategy from the thermal stress spectrum and the mechanical stress spectrum according to a comparison result of the real-time current data and a preset current threshold, and control the vibration device and the temperature control device to perform the aging test corresponding to the comparison result on the battery pack according to the test strategy.

8. The apparatus of claim 7, wherein, The comparison result includes a first comparison result, and the first comparison result indicates that the real-time current value of the battery pack is not less than the preset current threshold. The control module is further configured to: control the vibration device to vibrate and excite the battery pack at a preset high-intensity spectrum segment in the mechanical stress spectrum, and control the temperature control device to adjust the ambient temperature value according to the temperature setting value of the thermal stress spectrum at the current time, so as to control the ambient temperature value in a first preset temperature interval, and the first preset temperature interval indicates a temperature interval not lower than a normal temperature.

9. An electronic device, comprising: The method comprises: a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, the processor executes the machine readable instructions to execute the steps of the method as claimed in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to execute the steps of the method as claimed in any one of claims 1 to 6.

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