Battery test method, test equipment and nonvolatile readable storage medium

Abstract

The invention discloses a battery testing method, testing equipment and a nonvolatile readable storage medium, and the method comprises the steps: enabling a target battery to be in a testing environment simulating the working condition of a whole vehicle; acquiring various test data of the target battery in the test environment, wherein the various test data at least comprise stress-strain data of the target battery; according to the battery test method and the test environment provided by the embodiment of the invention, various test scenes can be provided for the target battery by simulating the working condition of the whole vehicle, the actual driving working condition of the actual vehicle is better met, the target battery can be comprehensively tested, and the applicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery testing method, testing equipment and a non-volatile readable storage medium. Background Art

[0002] As more and more electric vehicles are introduced to the market, the safety and reliability of their batteries are gaining increasing attention from manufacturers and consumers. Environmental and mechanical reliability testing of electric vehicle battery packs and systems is of paramount importance and has even been incorporated into mandatory battery inspections. Currently, a four-step battery pack test is being proposed. This innovative, integrated test combines vibration, temperature, humidity, and lifespan, enabling comprehensive, coordinated testing under four test conditions: temperature, humidity, charge / discharge, and vibration.

[0003] Existing research on vibration standards and vibration reliability for new energy battery packs is limited, lacking unified, systematic standards and corresponding evaluation methods. Research on the four comprehensive tests for battery packs is even more nascent, with no mature methods or standards. Furthermore, existing tests for these four comprehensive tests simply rely on equipment linkage, lacking robust applicability and providing inadequate guidance for future reliability research and product design optimization. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a battery testing method. By simulating the operating conditions of a complete vehicle, the test environment can provide multiple test scenarios for the target battery. This method better matches the actual driving conditions of an actual vehicle, enabling comprehensive testing of the target battery and enhancing its applicability.

[0005] A second object of the present invention is to provide a testing device.

[0006] A third object of the present invention is to provide a non-volatile readable storage medium.

[0007] In order to achieve the above-mentioned purpose, the battery testing method proposed in the embodiment of the first aspect of the present invention includes: the target battery is placed in a test environment simulating the operating conditions of the entire vehicle; obtaining a variety of test data of the target battery under the test environment, and the various test data at least include stress and strain data of the target battery.

[0008] According to the battery testing method proposed in an embodiment of the present invention, the test environment simulates the operating conditions of the entire vehicle, can provide a variety of test scenarios for the target battery, is more in line with the actual driving conditions of the actual vehicle, can achieve comprehensive testing of the target battery, has strong applicability, and the multiple test data at least include stress and strain data of the target battery, which can detect the strain condition of the target battery under the test environment.

[0009] In some embodiments of the present invention, the test environment includes the target battery being installed on a vibration table of a supporting environmental chamber according to the installation position of the target battery in the target vehicle and the test standard requirements.

[0010] In some embodiments of the present invention, the test environment also includes the charge and discharge cycle conditions of the target battery, and / or the temperature in the environmental chamber changes according to the preset temperature conditions, and / or the humidity in the environmental chamber changes according to the preset humidity conditions, and / or the vibration table vibrates at a random frequency, a fixed frequency, or a scanning frequency sequence.

[0011] In some embodiments of the present invention, the vibration table vibrates in a preset order of coordinate axis directions, and the coordinate axis directions include a z-axis, a y-axis, and an x-axis, wherein the x-axis corresponds to the vehicle's driving direction, the y-axis corresponds to the horizontal direction perpendicular to the vehicle's driving direction, and the z-axis corresponds to the vertical direction perpendicular to the vehicle's driving direction.

[0012] In some embodiments of the present invention, the vibration table vibrates in each coordinate axis direction according to a vibration road spectrum and vibrates for a preset time period, wherein the vibration road spectrum is a road spectrum required for vibration testing in the test standard, or the vibration road spectrum is an actual vibration road spectrum obtained based on actual vehicle road test data of the target vehicle.

[0013] In some embodiments of the present invention, the vibration table vibrates during a discharge phase of each charge and discharge cycle of the target battery.

[0014] In some embodiments of the present invention, the preset temperature condition includes: when the vibration table vibrates along the z-axis, the temperature in the environmental box shows a decreasing trend or an increasing trend over time within a test temperature range.

[0015] In some embodiments of the present invention, the preset temperature condition includes: when the vibration table vibrates along the y-axis, the temperature in the environmental box shows an increasing trend or a decreasing trend over time within a test temperature range.

[0016] In some embodiments of the present invention, the preset temperature condition includes: when the vibration table vibrates along the x-axis, the temperature in the environmental box shows a decreasing trend or an increasing trend over time within a test temperature range.

[0017] In some embodiments of the present invention, the preset temperature condition is determined by analyzing the actual temperature environment of the target vehicle throughout the year.

[0018] In some embodiments of the present invention, the preset humidity condition includes: a change in humidity in the environmental chamber is positively correlated with a change in temperature in the environmental chamber.

[0019] In some embodiments of the present invention, when the temperature inside the environmental chamber is greater than a first temperature threshold, the humidity inside the environmental chamber is a first humidity value; when the temperature inside the environmental chamber is greater than a second temperature threshold and less than the first temperature threshold, the humidity inside the environmental chamber is a second humidity value; wherein, the first humidity value is greater than the second humidity value.

[0020] In some embodiments of the present invention, the preset humidity condition is determined by analyzing the actual humidity environment of the target vehicle throughout the year.

[0021] In some embodiments of the present invention, the target battery has a charge-discharge cycle consisting of charging for a first preset time, resting for a second preset time, discharging for the first preset time, and resting for the second preset time, wherein the first preset time is greater than the second preset time.

[0022] In some embodiments of the present invention, the charge-discharge cycle condition of the target battery is determined by analyzing the driving data of the target vehicle and the driver's behavior habits.

[0023] In some embodiments of the present invention, various functional checks are performed on the target battery before and after the vibration table starts vibrating along each axis, and the test of the next axis is continued after the target battery reaches thermal equilibrium with the test environment of the next axis.

[0024] In some embodiments of the present invention, the stress-strain data includes strain detection data of internal components and external surfaces of the target battery during the test process.

[0025] In some embodiments of the present invention, the test data further includes installation torque data of the target battery and the test equipment detected before and after each test.

[0026] In some embodiments of the present invention, the test data further includes modal response vibration feedback data of the vibration table performing frequency sweep vibrations before and after the vibration of each axial direction.

[0027] In some embodiments of the present invention, the test data further includes insulation resistance and withstand voltage data of the target battery detected before and after each test.

[0028] In some embodiments of the present invention, the test data further includes charge and discharge data and / or temperature and humidity data of the target battery during the test.

[0029] In some embodiments of the present invention, the test data further includes vibration spectrum data of the vibration table during the test.

[0030] In some embodiments of the present invention, the test data further includes thermal management data of the target battery during the test.

[0031] In some embodiments of the present invention, the battery testing method further includes: obtaining air tightness test data and / or waterproof test data of the target battery.

[0032] In order to achieve the above-mentioned purpose, the second aspect of the present invention proposes a testing device, including: a vibration table; an environmental chamber, the box body of the environmental chamber is located on the vibration table, the inner cavity of the box body wraps the table top of the vibration table to form a confined space, and the target battery is suitable for being placed on the table top of the vibration table in the environmental chamber; a charging and discharging cabinet, the high and low voltage wiring harnesses of the charging and discharging cabinet are introduced into the interior of the environmental chamber, and the high and low voltage wiring harnesses of the charging and discharging cabinet are connected to the positive and negative poles of the target battery; a control system, the control system is respectively connected to the vibration table, the environmental chamber and the charging and discharging cabinet, and is used to execute any of the battery testing methods described above.

[0033] The testing equipment proposed in accordance with an embodiment of the present invention, based on the architecture of a vibration table, an environmental chamber, a charge-discharge cabinet, and a control system, takes the four integrated aspects as its starting point and, by executing any of the battery testing methods described above, can provide multiple test scenarios for a target battery, enabling comprehensive testing of the target battery and having strong applicability. Furthermore, the various test data includes at least stress and strain data of the target battery, enabling detection of the strain of the target battery under the test environment.

[0034] In some embodiments of the present invention, the control system includes: an environmental chamber control system, connected to the environmental chamber, for controlling the temperature and humidity inside the environmental chamber; a vibration control system, connected to the vibration table, for controlling the vibration of the vibration table; a charging and discharging cabinet system, suitable for being connected to the target battery in the environmental chamber, for controlling the charging and discharging of the target battery; and an integrated control system, respectively connected to the environmental chamber control system, the vibration control system and the charging and discharging cabinet system.

[0035] In some embodiments of the present invention, the testing equipment further includes: a thermal management system connected to the integrated control system and the environmental chamber, for performing thermal management on the target battery in the environmental chamber.

[0036] In some embodiments of the present invention, a mounting fixture is provided on the vibration table, and the mounting fixture is used to fix the target battery to a test table of the vibration table.

[0037] In some embodiments of the present invention, the environmental box is buckled on the vibration table, a waterproof flexible connection is made between the box wall of the environmental box and the test table, and the test table of the vibration table is located inside the environmental box.

[0038] In order to achieve the above-mentioned object, a third embodiment of the present invention further proposes a non-volatile readable storage medium having a computer program stored thereon, wherein the computer program implements any of the above-mentioned battery testing methods when executed.

[0039] According to the non-volatile readable storage medium proposed in an embodiment of the present invention, when the computer program is executed, by implementing any of the above battery testing methods, a test environment is set to simulate the operating conditions of the entire vehicle, and a variety of test scenarios can be provided for the target battery, which is more in line with the actual driving conditions of the actual vehicle, and can achieve comprehensive testing of the target battery. It has strong applicability, and the various test data include at least stress and strain data of the target battery, which can detect the strain condition of the target battery under the test environment.

[0040] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0042] Figure 1 is a block diagram of a testing device according to one embodiment of the present invention;

[0043] Figure 2 is a schematic diagram of a vibration table and an environmental chamber according to one embodiment of the present invention;

[0044] Figure 3 is a schematic diagram of a testing device according to one embodiment of the present invention;

[0045] Figure 4 is a flow chart of a battery testing method according to one embodiment of the present invention;

[0046] Figure 5is a graph showing a short-cycle four-comprehensive vibration test of a target battery according to one embodiment of the present invention;

[0047] Figure 6 4 is a graph showing four comprehensive temperature and humidity alternating test curves according to one embodiment of the present invention;

[0048] Figure 7 is a flow chart of a battery testing method according to another embodiment of the present invention;

[0049] Figure 8 A schematic diagram of the influence of multiple stress coupling according to an embodiment of the present invention;

[0050] Figure 9 Schematic diagram of four comprehensive multi-stress couplings according to one embodiment of the present invention.

[0051] Reference numerals:

[0052] Testing equipment 100, target battery 200;

[0053] Vibration table 10, environmental chamber 20, charging and discharging cabinet 30, control system 40, thermal management system 50;

[0054] Environmental chamber control system 41, vibration control system 42, charging and discharging cabinet control system 43, integrated control system 44;

[0055] Install the fixed tooling 11, the test table 12, and the soft connector A. DETAILED DESCRIPTION

[0056] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0057] In the prior art, a four-in-one integrated test system for power batteries is provided, comprising a charge-discharge cabinet, an environmental chamber, a vibration table, and a control unit. The power battery under test is placed in the environmental chamber, which is placed on the vibration table. The power output / input terminals of the charge-discharge cabinet are connected to the power input / output terminals of the power battery under test via a power cable to charge or discharge the power battery. The control unit is connected to the control terminals of the charge-discharge cabinet, the environmental chamber, and the vibration table via a network cable, controlling the cabinet, the environmental chamber, and the vibration table to simulate various test conditions. Simultaneously, the control unit is also connected to the data transmission port of the power battery under test via a network cable to read various data from the power battery under test in real time. The advantages of this technical solution are its simple structure and its ability to simultaneously perform integrated, integrated testing under four test conditions: temperature, humidity, charge-discharge, and vibration. However, this four-in-one integrated test system for power batteries is simply a simple device linkage, failing to consider the superposition and coupling of multiple stress scenarios and environmental factors. Furthermore, it lacks detailed theoretical analysis and data reliability verification, lacks mature methods and standards, and is therefore not very applicable, failing to effectively guide further reliability research and product design optimization. Based on this, an embodiment of the present invention proposes a battery testing method that takes into account the superposition and coupling of multiple stress scenarios and environmental factors. The testing method is mature and reliable, can be used as an industry standard, has strong applicability, and can well guide the next step of reliability research and product design optimization.

[0058] In some embodiments of the present invention, the battery testing method proposed in the embodiments of the present invention is a four-in-one test method for batteries. The four-in-one test of batteries is an innovative test that combines vibration, temperature, humidity, life, etc. Therefore, the battery testing method is carried out in a specific test environment, usually by setting up test equipment to provide a corresponding test environment. Figure 1 and Figure 2 Understand the test equipment of the embodiment of the present invention.

[0059] Figure 1 is a block diagram of a testing device according to one embodiment of the present invention; Figure 2 Schematic diagram of a vibration table and an environmental chamber according to an embodiment of the present invention. Figure 2 The charging and discharging cabinet 30 is not shown.

[0060] like Figure 1 As shown, the testing equipment 100 includes a vibration table 10 , an environmental chamber 20 , a charge and discharge cabinet 30 and a control system 40 .

[0061] Specifically, if Figure 2 As shown, an environmental chamber 20 is located on a vibration table 10, and a target battery 200 is suitable for placement within the environmental chamber 10. The environmental chamber 10 is used to simulate the ambient temperature and humidity during actual vehicle operation. The target battery is the test object, such as a functioning vehicle battery or battery system.

[0062] It is understood that the target battery 200 can be a battery pack, a battery module, or a single cell, etc., and the target battery 200 can also include a battery and its battery management system (BMS). For a separate battery pack, battery module, or single cell, etc., the battery pack, battery module, or single cell can be placed on the table of the vibration table 10 as a test target for testing. For an integrated battery and its battery management system, the integrated power battery and its battery management system can be placed on the table of the vibration table 10 as a test target for testing.

[0063] Specifically, in some embodiments, a mounting fixture 11 is provided on the vibration table 10, wherein the mounting fixture 11 may actually be a fixing fixture including a bolt, and the mounting fixture 11 is used to fix the target battery 200 to the test table 12 of the vibration table 10, and the target battery 200 is driven to vibrate when the vibration table 12 vibrates.

[0064] Furthermore, the environmental chamber 20 is buckled onto the vibration table 10, and a waterproof flexible connection is formed between the wall of the environmental chamber 20 and the test table 12. The test table 12 of the vibration table 10 is located inside the environmental chamber 20. Since the vibration table 11 is not a fixed structure, the test table 12 of the vibration table 20 must form a sealed structure with the wall of the environmental chamber 20 and be movable. The heat-proof flexible connection used to seal the wall of the environmental chamber 20 with the test table 12 can be a flexible connector A, and its material is not specifically limited here.

[0065] The high and low voltage wiring harnesses of the charging and discharging cabinet 30 are introduced into the interior of the environmental box 20 , and are connected to the positive and negative poles of the target battery 200 . The charging and discharging cabinet 30 is used to control the target battery 200 to perform charging and discharging operations in response to control instructions.

[0066] The control system 40 is connected to the vibration table 20 , the environmental chamber 20 , and the charge and discharge cabinet 30 , respectively, and is used to execute the battery testing method proposed in the embodiment of the present invention.

[0067] Specifically, the control system 40 has the functions of signal acquisition, data analysis and processing, as well as control of each part. It can control the vibration table 10, environmental chamber 20 and charging and discharging cabinet 30 to simulate various test conditions, so as to restore the actual vehicle usage scenarios from multiple angles, and can simultaneously realize comprehensive linkage testing under four test conditions of temperature, humidity, charging and discharging, and vibration.

[0068] The test device 100 proposed in accordance with an embodiment of the present invention, based on the architecture of a vibration table 10, an environmental chamber 20, a charge-discharge cabinet 30, and a control system 40, takes the four integrated aspects as a starting point and, by executing any of the battery testing methods described above, can provide multiple test scenarios for a target battery, enabling comprehensive testing of the target battery and having strong applicability. Furthermore, the multiple test data includes at least stress and strain data of the target battery, enabling detection of the strain of the target battery under the test environment.

[0069] Based on the above, the test environment of multiple stress coupling effects provided by the test equipment 100 of the embodiment of the present invention restores the actual vehicle usage scenario from multiple angles, making the test environment more in line with the actual vehicle driving conditions, thereby enabling the target battery to be tested in an integrated manner including vibration, temperature, humidity, life, etc.

[0070] In some embodiments of the present invention, Figure 1 and Figure 3 Understand the control system 40 of the embodiment of the present invention, wherein, Figure 3 A schematic diagram of a test device according to an embodiment of the present invention. Figure 3 Not shown in the control system 40.

[0071] like Figure 3 As shown, the control system 40 includes an environmental chamber control system 41 , a vibration control system 42 , a charging and discharging cabinet system 43 and an integrated control system 44 .

[0072] Among them, the environmental box control system 41 is connected to the environmental box 20, and is used to control the temperature and humidity in the environmental box 20. The vibration control system 42 is connected to the vibration table 10, and is used to control the vibration of the vibration table 10. Among them, the vibration control system 42 can control the vibration table 10 to perform random frequency vibrations in different directions respectively. Specifically, the random frequency, fixed frequency or sweep frequency sequence is a frequency in the frequency range required for the vibration test in the test standard, or the random frequency or fixed frequency or sweep frequency sequence is a vibration frequency obtained based on the actual vehicle road test data of the target vehicle. And, the vibration control system 42 can also be used to detect vibration data such as PSD (Power Spectral Density) of the vibration table 10 to detect the actual vibration situation of the vibration table 10.

[0073] The charging and discharging cabinet system 43 is adapted to be connected to the target battery 200 in the environmental chamber 20 for controlling the charging and discharging of the target battery 200. The charging and discharging cabinet system 43 is connected to the charging and discharging cabinet 30 and the target battery 200 in the environmental chamber 20, respectively, for sending instructions to the charging and discharging cabinet 30 to control the charging, discharging, and static operation of the target battery 200. Furthermore, the charging and discharging cabinet system 43 is also connected to the target battery 200 via a CAN line to collect data such as the current value and voltage value during the charging and discharging process of the target battery 200, thereby enabling real-time monitoring of the status of the target battery 200 during the test.

[0074] The integrated control system 44 is connected to the environmental chamber control system 41, the vibration control system 42, and the charge-discharge cabinet system 43. The integrated control system 44 can be a master controller for controlling the environmental chamber control system 41, the vibration control system 42, and the charge-discharge cabinet system 43. For example, the integrated control system 44 can control the vibration control system 42 and the charge-discharge cabinet system 43 to cause the vibration table 10 to vibrate during the discharge phase of each charge-discharge cycle of the target battery 200.

[0075] The integrated control system 44 can also analyze and process the data obtained by the vibration control system 42 and the charging cabinet port control system 43, so that the test equipment 100 can provide a test environment and test method that is more in line with the actual driving conditions of the vehicle.

[0076] According to the control system 40 proposed in the embodiment of the present invention, the integrated control system 44 serves as a master controller and is connected to the environmental chamber control system 41, the vibration control system 42 and the charging and discharging cabinet system 43 respectively. It can comprehensively consider various environmental stresses, and based on the four comprehensives, introduce experimental conditions that more accurately and reasonably simulate the working conditions of the entire vehicle. It can also provide the most complete and comprehensive test scenario construction method at present by defining relevant standards, and ultimately achieve coverage of the entire life cycle of the target battery.

[0077] In some embodiments of the present invention, Figure 3 As shown, the test equipment 100 further includes a thermal management system 50 , which is connected to the integrated control system 44 and the environmental chamber 10 , and is used to perform thermal management on the target battery 200 in the environmental chamber 20 .

[0078] It is understood that some power batteries or power batteries and their battery management systems are equipped with thermal management systems, namely battery cooling systems, for regulating the operating temperature of the battery or battery system. The thermal management system 50 in the embodiment of the present invention can be a water chiller. For a target battery 200 equipped with a thermal management system, the thermal management system 50 in the embodiment of the present invention can be connected to the water pipes in the water channel of the target battery 200. During the test process, the integrated control system 44 controls the thermal management system 50 to operate normally according to the strategy specified by the manufacturer of the target battery 200. Furthermore, for a target battery 200 not equipped with a thermal management system, during the test, the thermal management system 50 in the embodiment of the present invention is not connected to the water pipes in the water channel of the target battery 200, and the thermal management system 50 in the embodiment of the present invention does not operate.

[0079] Based on the above, the integrated control system 44 controls the environmental chamber control system 41, the vibration control system 42, the charging and discharging cabinet system 43 and / or the thermal management system 50, and can provide the target battery with various scenarios and environmental factors during the actual vehicle operation process, taking into account the superposition and coupling of multiple stress scenarios and environmental factors, which is more in line with actual vehicle driving conditions, and through the acquisition and analysis of various test data of the target battery in the test environment, the comprehensiveness of the battery testing system is improved and its applicability is strong.

[0080] Reference below Figure 4-Figure 9 A battery testing method according to an embodiment of the present invention is described.

[0081] In some embodiments of the present invention, Figure 4 FIG. 1 is a flow chart of a battery testing method according to an embodiment of the present invention, wherein the battery testing method at least includes step S1 and step S2, which are specifically as follows.

[0082] S1, the target battery is in a test environment simulating the vehicle operating conditions.

[0083] Specifically, in some embodiments, the test environment includes mounting the target battery on a vibration table in an environmental chamber according to the battery's mounting position in the target vehicle and the test standard requirements, such as the national standard GB / T 2423.43 (source document not shown here). The test environment is provided by the test equipment of the above embodiments, and the target battery is secured to the test table of the vibration table via mounting fixtures.

[0084] In other embodiments, the test environment also includes charge and discharge cycle conditions for the target battery, temperature changes in the environmental chamber according to preset temperature conditions, humidity changes in the environmental chamber according to preset humidity conditions, and a vibration table vibrating at a random frequency, a fixed frequency, or a sweeping frequency sequence. The charge and discharge cycle conditions, temperature preset conditions, and humidity preset conditions of the target battery can all be set based on the actual environment in which the target battery is located on the target vehicle, thereby more accurately and reasonably simulating the experimental conditions of the entire vehicle operating condition.

[0085] Specifically, the charge and discharge cycle conditions of the target battery are determined by analyzing the driving data of the actual target vehicle and the driver's behavior habits; the humidity preset conditions are determined by analyzing the humidity environment of the actual target vehicle throughout the year; and the temperature preset conditions are determined by analyzing the temperature environment of the actual target vehicle throughout the year.

[0086] As described above, after the target battery of the embodiment of the present invention reaches thermal equilibrium with the test environment, random vibration is applied in each direction under an alternating temperature and humidity environment, accompanied by a charge and discharge cycle process, that is, the test is carried out according to the charge and discharge cycle conditions, temperature preset conditions, humidity preset conditions and the vibration frequency of the vibration table. Taking the four comprehensives as the starting point, various environmental stresses are comprehensively considered, so that the test environment can provide the target battery with the coupling influence of multiple stresses, so as to achieve coverage of the entire life cycle of the target battery.

[0087] In addition, the charge and discharge cycle conditions, temperature preset conditions, humidity preset conditions, etc. are described in detail in the following embodiments.

[0088] S2, obtaining a variety of test data of the target battery under a test environment, wherein the various test data at least include stress and strain data of the target battery.

[0089] In some embodiments, the stress-strain data includes strain detection data of the internal components and external surface of the target battery during the test. Specifically, before the test begins, strain detection equipment can be attached to the internal components and external surface of the target battery according to the requirements of the manufacturer or the client. The strain detection equipment generally includes strain gauges, strain rosettes, or other sensors for obtaining strain detection data. The strain detection equipment is connected to a strain monitoring device, which is used to monitor the stress and strain conditions inside and on the surface of the target battery in real time based on the obtained strain detection data. The stress and strain conditions inside and on the surface of the target battery can reflect the deformation conditions inside or on the surface of the target battery. Furthermore, the strain monitoring device of the embodiment of the present invention can be the integrated control system 44 of the above embodiment. That is, the integrated control system 44 acts as a master controller and is directly connected to the strain detection equipment on the surface or inside of the target battery, thereby directly obtaining strain detection data.

[0090] According to the battery testing method proposed in an embodiment of the present invention, the test environment simulates the operating conditions of the entire vehicle, can provide a variety of test scenarios for the target battery, is more in line with the actual driving conditions of the actual vehicle, can achieve comprehensive testing of the target battery, has strong applicability, and the multiple test data at least include stress and strain data of the target battery, which can detect the strain condition of the target battery under the test environment.

[0091] In addition, the target battery must be inspected before and after each vibration test in each direction. The target battery must comply with the specified requirements. For example, if the battery cooling system uses coolant, if the test does not require battery cooling, the test can also be performed after the coolant is drained. The target battery can only be tested after reaching thermal equilibrium with the test environment in the next direction.

[0092] In some embodiments of the present invention, the vibration table vibrates in a preset order of coordinate axis directions, and the coordinate axis directions include the z-axis, y-axis, and x-axis. For example, the preset order of the vibration test can be set to y-axis, z-axis, x-axis; x-axis, z-axis, y-axis, etc., which will not be described here. Among them, the x-axis corresponds to the direction of vehicle travel, the y-axis corresponds to the horizontal direction perpendicular to the direction of vehicle travel, and the z-axis corresponds to the vertical direction perpendicular to the direction of vehicle travel. It can be understood that after the target battery is installed in the actual vehicle, when the vehicle is running, the vibration direction of the target battery is generally also the direction corresponding to the z-axis, y-axis, and x-axis. In the following, the embodiments of the present invention are described by taking the preset order of z-axis, y-axis, and x-axis as an example.

[0093] Furthermore, the vibration table vibrates along the z-axis, y-axis and x-axis according to the vibration frequencies in the vibration spectrum. Specifically, the vibration table can be vibrated in combination with Table 1 and Figure 5 To understand the vibration direction of the vibration table and the random frequency of vibration in the vibration direction within a single vibration cycle of an embodiment of the present invention, Table 1 is a vibration frequency test standard table according to an embodiment of the present invention; Figure 5 1 is a graph showing a short-cycle four-comprehensive vibration test of a target battery according to an embodiment of the present invention.

[0094] Table 1

[0095]

[0096] The vibration spectrum shown in Table 1 is the spectrum within the frequency range required for vibration testing in the test standard, that is, the national standard. Figure 5As shown, when the vibration table vibrates along the z-axis, y-axis, and x-axis respectively, the vibration frequency changes in real time, and its value is any one of the frequencies corresponding to the z-axis, y-axis, and x-axis in Table 1. Moreover, when the vibration table vibrates at any frequency, the corresponding power spectrum density is the value of the power spectrum density corresponding to the vibration frequency in the table.

[0097] Alternatively, the vibration road spectrum is the actual vibration road spectrum obtained based on actual road test data of the target vehicle. That is, when the manufacturer or client provides vibration test parameters derived from actual road test data, such as using a vibration road spectrometer to collect the vehicle's actual road test data and then convert it into a frequency domain road spectrum, i.e., the actual vibration road spectrum, the vibration test should be conducted in accordance with the actual vibration road spectrum provided by the manufacturer or client.

[0098] In some embodiments, the vibration table vibrates at random frequencies, fixed frequencies, or a sweeping frequency sequence for a preset duration along the z-axis, y-axis, and x-axis. Specifically, the vibration table vibrates during the discharge phase of each charge-discharge cycle of the target battery. The charge-discharge cycle conditions of the target battery according to an embodiment of the present invention can be understood in conjunction with Table 2, which shows the charge-discharge cycle parameters for a single vibration cycle of a target battery according to an embodiment of the present invention.

[0099] Table 2

[0100] Charge and discharge cycle steps Current system time Charge I1 60min Shelved / 30min discharge I1 60min Shelved / 30min

[0101] In some embodiments of the present invention, as shown in Table 2, the target battery has a charge and discharge cycle period of a first preset time for charging, a second preset time for resting, a first preset time for discharging, and a second preset time for resting, wherein the first preset time is greater than the second preset time. Specifically, the charge and discharge cycle step means that the target battery is in a state of charging, discharging, and resting, and the current system represents the current magnitude of the target battery in the charge, discharge, and resting state. The embodiment of the present invention is described by taking the first preset time of 60 minutes, the second preset time of 30 minutes, the charging current magnitude of I1, and the discharging current magnitude of I1 as shown in Table 2 as an example. This is only an example and is not specifically limited.

[0102] The charge and discharge cycle parameters of the target battery are as shown in Table 2. Since the target battery is only subjected to vibration test during the discharge process, the end of the four comprehensive tests in this direction is defined as the end of every 20 charge and discharge cycles. Therefore, the vibration table cycles 20 times in each axis, for a total of 60 cycles, that is, the vibration table randomly vibrates for 20 hours in each axis, for a total of 60 hours.

[0103] In addition, the target battery is subjected to various functional checks before and after the vibration table begins vibrating along each axis, and testing in the next axis is continued after the target battery reaches thermal equilibrium with the test environment in the next axis. In other words, the target battery's appearance, condition, etc. must be checked before and after the test in each direction, and the target battery is tested in accordance with the specified requirements. For example, if the battery cooling system uses coolant, if the test does not require battery cooling, the test can be continued only after the coolant is drained and thermal equilibrium is reached with the test environment in the next direction.

[0104] Furthermore, Table 3 and Figure 6 To understand the temperature preset conditions and humidity preset conditions of the embodiment of the present invention, Table 2 is a table of four comprehensive temperature and humidity alternating test conditions according to one embodiment of the present invention; Figure 6 The following are four comprehensive temperature and humidity alternating test curves according to one embodiment of the present invention. Among them, SOC (State of Charge) represents the state of charge of the target battery. Figure 6 The curve shown in SOC can reflect the charging and discharging process of the target battery.

[0105] Table 3

[0106]

[0107] In some embodiments of the present invention, as shown in Table 3 and Figure 6 As shown, the preset temperature condition includes: when the vibration table vibrates along the z-axis, the temperature within the environmental chamber shows a decreasing or increasing trend over time within the test temperature range. This description uses a decreasing trend as an example. Under this condition, taking the temperature decreasing from 45°C to -10°C as an example, the entire decreasing process includes a temperature decreasing phase and a constant temperature phase. In other embodiments of the present invention, the preset temperature condition includes: when the vibration table vibrates along the y-axis, the temperature within the environmental chamber shows an increasing or decreasing trend over time within the test temperature range. This description uses an increasing trend as an example. Under this condition, taking the temperature increasing from -10°C to 45°C as an example, the entire increasing process includes a temperature increasing phase and a constant temperature phase. In still other embodiments of the present invention, the preset temperature condition includes: when the vibration table vibrates along the x-axis, the temperature within the environmental chamber shows a decreasing or increasing trend over time within the test temperature range. This description uses a decreasing trend as an example. Taking the temperature decreasing from 45°C to -10°C as an example, the entire decreasing process includes a temperature decreasing phase and a constant temperature phase. Furthermore, in some embodiments of the present invention, the preset humidity condition includes: a change in humidity within the environmental chamber is positively correlated with a change in temperature within the environmental chamber.

[0108] Specifically, when the temperature in the environmental chamber is greater than the first temperature threshold, the humidity in the environmental chamber is the first humidity value; when the temperature in the environmental chamber is greater than the second temperature threshold and less than the first temperature threshold, the humidity in the environmental chamber is the second humidity value; wherein the first humidity value is greater than the second humidity value. Specifically, in actual environments, areas with lower temperatures are usually drier, so when the temperature is too low, the influence of humidity can be ignored. Therefore, as shown in Table 3 and Figure 6 As shown, in the embodiment of the present invention, the first temperature threshold is set to 45°C, the second temperature threshold is set to 15°C, the first humidity value is set to 80%RH, and the second humidity value is set to 60%RH. This is only for illustration and is not specifically limited.

[0109] In some embodiments of the present invention, the test data also includes the movement of the target battery and the mounting fixtures of the test equipment, respectively, measured before and after each test. The movement before each test refers to the start of the vibration test of the target battery in each direction, the movement at this time refers to the time before the target battery reaches thermal equilibrium with the test environment, and the movement after each test refers to the completion of the vibration test of the target battery in each direction.

[0110] As can be seen from the above embodiment, the mounting fixtures of the test equipment include bolts, which are used to secure the target battery to the test table of the vibration table so that the target battery does not move relative to the test table during the test. It is understandable that when the vibration table vibrates, the mounting fixtures will also vibrate, and the vibration may cause the torque of the bolts to change. If the change in the bolt torque is large, the bolts will loosen, and the target battery and the test table will not be able to achieve relative stillness, which will affect the test results of the target battery. In addition, for target batteries equipped with bolt structures, during the test, when the vibration table vibrates, the torque of the bolt structure in the test battery changes. If the change in the torque of the bolt structure is large, it indicates that the structural stability of the target battery is poor. Based on this, before and after each test, the movement of the mounting fixtures of the target battery and the test equipment should be detected separately according to the bolt torque measurement method specified by the manufacturer or the client. That is, the residual torque of each bolt involved in the target battery and the test equipment should be measured, recorded, and verified separately to achieve accurate testing of the target battery.

[0111] In some embodiments of the present invention, the test data also includes vibration feedback data of the vibration table performing sweep frequency vibration before and after the vibration along each axial direction. Specifically, before and after the vibration test in each vibration test direction, the target battery needs to be subjected to sweep frequency vibration to obtain vibration feedback data, and the modal changes of the target battery can be analyzed based on the vibration feedback data. The frequency range of the sweep frequency vibration can be set to 2-1000Hz, and the acceleration of the sweep frequency vibration can be set to 0.1g.

[0112] In some embodiments of the present invention, the test data also includes the insulation resistance of the target battery measured before and after each test. Specifically, before and after each vibration test in each vibration test direction, the target battery is tested according to the insulation resistance test method and the data is recorded. Based on the recorded data, changes in the insulation capacity of the target battery can be analyzed.

[0113] In some embodiments of the present invention, the test data also includes the charge and discharge data of the target battery during the test, and in other embodiments, the test data also includes the temperature and humidity data of the target battery during the test. It is understandable that during the test, the charge and discharge voltage, temperature, and humidity of the target battery are constantly changing during charging and discharging. In particular, the charge and discharge voltage and temperature have a greater impact on the target battery. If the charge and discharge voltage and / or temperature of the target battery change drastically in a short period of time, it will affect the safety of the target battery and the safety of the test operator and the laboratory. Therefore, in order to protect the safety of the test operator and the laboratory, the manufacturer should provide alarm signals such as voltage mutation limit and temperature mutation limit as abnormal termination conditions. That is, by real-time monitoring the status of the minimum monitoring unit of the target battery, such as voltage and temperature, when it is determined based on the detected charge and discharge voltage data and temperature data of the target battery that the voltage change of the target battery within a preset time reaches the voltage mutation limit, and / or the temperature change of the target battery within a preset time reaches the temperature mutation limit, the test is terminated and an alarm is issued.

[0114] In some embodiments of the present invention, the test data also includes vibration spectrum data of the vibration table during the test. Specifically, according to the above embodiment, during the test, the vibration control system needs to record PSD (Power Spectral Density), or vibration spectrum data, every two hours while controlling the vibration of the vibration table to detect the actual vibration of the vibration table 10. The actual vibration of the vibration table can be determined based on the frequencies within the frequency range required by the vibration test and the vibration spectrum data of the vibration table. The PSD is used to describe the vibration spectrum.

[0115] In some embodiments of the present invention, the test data also includes thermal management data of the target battery during the test. For a target vehicle equipped with a battery thermal management system, the thermal management system connected to the target battery in the test equipment operates normally throughout the test according to the manufacturer's specified strategy, and acquires the target battery's thermal management data in real time during the test.

[0116] In some embodiments of the present invention, the battery testing method further includes: obtaining airtightness test data and / or waterproofness test data of the target battery.

[0117] Specifically, after the test in each vibration test direction is completed, the target battery needs to be subjected to an air tightness test and a waterproof test. Based on the obtained air tightness test data and waterproof test data, the air tightness and waterproofness of the target battery after the four comprehensive tests can be judged.

[0118] In some embodiments of the present invention, Figure 7 FIG. 1 is a flow chart of a battery testing method according to another embodiment of the present invention, wherein the battery testing method may include steps S101 - S106 , which are specifically as follows.

[0119] S101: Confirm the target battery's status information and operating condition data, as well as specific criteria. These criteria may include voltage mutation limits and temperature mutation limits, which are not specifically limited here.

[0120] S102, strain gauges or strain rosettes are installed inside and outside the target battery and connected to the integrated control system.

[0121] S103: Secure the target battery to the test surface of the vibration table using a mounting fixture. Install temperature, voltage, acceleration, and other sensors, and electrically connect the target battery to the control system. The control system connected to the target battery includes a charging and discharging cabinet system, a thermal management system, and an integrated control system.

[0122] S104: Start the environmental chamber control system, wait for the target battery to reach thermal equilibrium with the ambient temperature, and then begin the random vibration test. The charge and discharge cycle process is loaded according to the road profile. The loading order is Z-axis, Y-axis, and X-axis.

[0123] S105 , before and after the vibration test in each vibration test direction, performing a frequency sweep vibration test on the target battery and recording the modal changes of the target battery.

[0124] During the test, S106 monitors the information and signals of each host computer of the target battery in real time. After each vibration test direction is completed, the target battery is tested for air tightness and water resistance. The host computers include an environmental chamber control system 41, a vibration control system 42, a charge and discharge cabinet system 43, and a thermal management system 40.

[0125] like Figure 8 As shown in FIG, it is a schematic diagram of the influence of multiple stress coupling according to an embodiment of the present invention. Figure 8It can be seen that the battery testing method proposed in the embodiment of the present invention actually proposes a more comprehensive coupling of four comprehensive battery testing methods, in which the setting of the coupled parameters, the analysis ideas and factors that need to be considered are equivalent to coupling the vehicle's actual road spectrum operating condition classification, the vehicle's annual temperature and humidity environment summary, the driver and passenger behavior habit analysis, the vehicle's total mileage / service life, and other conditions. Among them, the vibration table vibrates randomly on the z-axis, y-axis and x-axis according to the frequency in the vibration road spectrum, and its vibration frequency is the frequency range required for the vibration test in the test standard, which is equivalent to making the operating conditions of the vibration road spectrum of the target vehicle include urban roads, highways, rural roads, mountain roads and other working conditions; the changes in the preset temperature conditions and humidity preset conditions in the environmental chamber are equivalent to making the vehicle's annual temperature and humidity environment summary include high-cold areas, high-temperature areas, areas with distinct temperatures, constant temperature areas, etc.; the charge and discharge cycle conditions of the target battery are equivalent to making the driver and passenger behavior habit analysis include more fast charging, more slow charging, standard commuting, online car-hailing, free travel, etc.; the preset vibration duration, as well as the charging, discharging and static time and test cycle period, are equivalent to making the vehicle's total mileage / service life and other conditions include the standard 300,000 kilometers, eight years of driving time, and double the taxi mileage. A battery testing method according to an embodiment of the present invention combines innovative tests such as vibration, temperature, humidity, and lifespan, comprehensively considers various environmental stresses, and takes the four comprehensive factors as the starting point to introduce experimental conditions that more accurately and reasonably simulate the working conditions of the entire vehicle. It defines relevant standards and provides the most complete and comprehensive test scenario construction method currently available. It characterizes the coupling effects of multiple stresses with a comprehensive testing method and achieves coverage of the entire life cycle.

[0126] Based on the above, Figure 9 As shown in the figure, it is a schematic diagram of four comprehensive multi-stress coupling according to an embodiment of the present invention. The battery testing method proposed in the embodiment of the present invention fully considers the influence of multi-stress superposition coupling in the actual environment, which is more in line with the actual vehicle driving conditions; it takes into account the aging effect of the vehicle in the environment during the entire life cycle, verifies the whole life process of the battery from the factory state to the scrap state, and replaces the existing simple cycle aging or vibration reliability verification. Figure 7 It can be seen that by adopting the battery testing method of the embodiment of the present invention, the fatigue boundary, life boundary and aging boundary of the target battery can be determined. The battery testing method is innovative, comprehensive and reliable, and can better guide product design and research and development.

[0127] In order to achieve the above-mentioned object, a third embodiment of the present invention further proposes a non-volatile readable storage medium having a computer program stored thereon, which implements any of the above battery testing methods when the computer program is executed.

[0128] According to the non-volatile readable storage medium proposed in an embodiment of the present invention, when the computer program is executed, by implementing any of the above battery testing methods, a test environment is set to simulate the operating conditions of the entire vehicle, and a variety of test scenarios can be provided for the target battery, which is more in line with the actual driving conditions of the actual vehicle, and can achieve comprehensive testing of the target battery. It has strong applicability, and the various test data include at least stress and strain data of the target battery, which can detect the strain condition of the target battery under the test environment.

[0129] Other structures and operations of the testing device 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0130] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0131] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A battery testing method, characterized in that: include: The target battery is placed in a test environment that simulates the operating conditions of the entire vehicle; A plurality of test data of the target battery under the test environment is acquired, wherein the plurality of test data at least includes stress and strain data of the target battery.

2. The battery testing method according to claim 1, wherein: The test environment includes the target battery being installed on a vibration table of a matching environmental chamber according to the installation position of the target battery in the target vehicle and the test standard requirements.

3. The battery testing method according to claim 2, wherein: The test environment also includes the charge and discharge cycle conditions of the target battery, and / or the temperature in the environmental chamber changes according to the preset temperature conditions, and / or the humidity in the environmental chamber changes according to the preset humidity conditions, and / or the vibration table vibrates at a random frequency, a fixed frequency, or a scanning frequency sequence.

4. The battery testing method according to claim 3, wherein: The vibration table vibrates in a preset order of coordinate axis directions, wherein the coordinate axis directions include a z-axis, a y-axis, and an x-axis, wherein the x-axis corresponds to a vehicle driving direction, the y-axis corresponds to a horizontal direction perpendicular to the vehicle driving direction, and the z-axis corresponds to a vertical direction perpendicular to the vehicle driving direction.

5. The battery testing method according to claim 4, characterized in that: The vibration table vibrates in each coordinate axis direction according to a vibration road spectrum and vibrates for a preset time period, wherein the vibration road spectrum is a road spectrum required for vibration testing in the test standard, or the vibration road spectrum is an actual vibration road spectrum obtained based on actual vehicle road test data of the target vehicle.

6. The battery testing method according to claim 5, characterized in that: The vibration table vibrates during the discharge phase of each charge and discharge cycle of the target battery.

7. The battery testing method according to claim 5, characterized in that: The temperature preset condition includes: when the vibration table vibrates along the z-axis, the temperature in the environmental box shows a decreasing trend or an increasing trend over time within a test temperature range.

8. The battery testing method according to claim 5, wherein: The temperature preset condition includes: when the vibration table vibrates along the y-axis, the temperature in the environmental box shows an increasing trend or a decreasing trend over time within a test temperature range.

9. The battery testing method according to claim 5, characterized in that: The temperature preset condition includes: when the vibration table vibrates along the x-axis, the temperature in the environmental box shows a decreasing trend or an increasing trend over time within a test temperature range.

10. The battery testing method according to any one of claims 7 to 9, characterized in that: The temperature preset condition is determined based on an analysis of the actual temperature environment of the target vehicle throughout the year.

11. The battery testing method according to any one of claims 7 to 9, characterized in that: The humidity preset condition includes: a change in humidity in the environmental chamber is positively correlated with a change in temperature in the environmental chamber.

12. The battery testing method according to claim 11, wherein: When the temperature in the environmental box is greater than a first temperature threshold, the humidity in the environmental box is a first humidity value; when the temperature in the environmental box is greater than a second temperature threshold and less than the first temperature threshold, the humidity in the environmental box is a second humidity value; Wherein, the first humidity value is greater than the second humidity value.

13. The battery testing method according to claim 11, wherein: The humidity preset condition is determined based on an analysis of the actual humidity environment of the target vehicle throughout the year.

14. The battery testing method according to claim 5, wherein: The target battery has a charge and discharge cycle period of charging for a first preset time, standing for a second preset time, discharging for the first preset time, and standing for the second preset time, wherein the first preset time is greater than the second preset time.

15. The battery testing method according to claim 14, wherein: The charge and discharge cycle conditions of the target battery are determined by analyzing the driving data of the target vehicle and the driver's behavior habits.

16. The battery testing method according to claim 5, wherein: Before the vibration table starts vibrating along each axial direction and after the vibration ends, various functional checks are performed on the target battery respectively, and after the target battery reaches thermal equilibrium with the test environment of the next axial direction, the test of the next axial direction is continued.

17. The battery testing method according to claim 1, wherein: The stress-strain data includes strain detection data of internal components and external surfaces of the target battery during the test.

18. The battery testing method according to claim 1, wherein: The test data also includes installation torque data of the target battery and the test equipment detected before and after each test.

19. The battery testing method according to claim 5, wherein: The test data also includes modal response vibration feedback data of the vibration table performing frequency sweep vibration before and after the vibration along each axial direction.

20. The battery testing method according to claim 1, wherein: The test data also includes insulation resistance and withstand voltage data of the target battery detected before and after each test.

21. The battery testing method according to claim 1, wherein: The test data also includes charge and discharge data and / or temperature and humidity data of the target battery during the test.

22. The battery testing method according to claim 1, wherein: The test data also includes vibration spectrum data of the vibration table during the test.

23. The battery testing method according to claim 1, wherein: The test data also includes thermal management data of the target battery during the test.

24. The battery testing method according to claim 1, wherein: The battery and system testing method further includes: obtaining air tightness test data and / or waterproof test data of the target battery.

25. A testing device, characterized in that: include: Vibration table; An environmental chamber, wherein the chamber body of the environmental chamber is located on the vibration table, the inner cavity of the chamber body wraps the table top of the vibration table to form a closed space, and the target battery is suitable for being placed on the table top of the vibration table in the environmental chamber; A charging and discharging cabinet, wherein the high and low voltage wiring harnesses of the charging and discharging cabinet are introduced into the interior of the environmental chamber, and the high and low voltage wiring harnesses of the charging and discharging cabinet are connected to the positive and negative electrodes of the target battery; A control system, wherein the control system is connected to the vibration table, the environmental chamber, and the charge and discharge cabinet, respectively, and is used to execute the battery testing method according to any one of claims 1 to 24.

26. The testing device according to claim 25, characterized in that The control system includes: An environmental chamber control system, connected to the environmental chamber, for controlling the temperature and humidity in the environmental chamber; a vibration control system connected to the vibration table and used to control the vibration of the vibration table; a charge-discharge cabinet system, adapted to be connected to the target battery in the environmental chamber and the charge-discharge cabinet, and configured to control the charge and discharge of the charge-discharge cabinet and the target battery; The integrated control system is connected to the environmental chamber control system, the vibration control system and the charging and discharging cabinet system respectively.

27. The testing device according to claim 25, characterized in that The testing equipment further comprises: A thermal management system is connected to the integrated control system and the environmental chamber, and is used for performing thermal management on the target battery in the environmental chamber.

28. The testing device according to claim 25, characterized in that The vibration table is provided with an installation and fixing tool, and the installation and fixing tool is used to fix the target battery to the test table of the vibration table.

29. The testing device according to claim 25, characterized in that The environmental box is buckled on the vibration table, a waterproof soft connection is made between the box wall of the environmental box and the test table, and the test table of the vibration table is located inside the environmental box.

30. A non-volatile readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the battery testing method according to any one of claims 1 to 24 is implemented.

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