Battery testing device, testing system with battery testing device and testing method

Abstract

The invention relates to the field of vehicle batteries, in particular to a testing device for a battery, a testing system with the testing device for the battery and a testing method. A fixing structure is arranged on the bottom supporting plate; the fixing structure comprises two end part end plates which are distributed at an interval; the fixing structure further comprises at least one isolation end plate. Each isolation end plate is arranged in an area between the two end part end plates; placing grooves are formed between the adjacent isolation end plates or between the isolation end plates and the adjacent end part end plates; the testing device disclosed by the invention can simulate the stress and cooling or heating conditions of the battery cell module in the whole pack, so that the battery cell module can conveniently replace the whole pack to carry out cycle testing; and the test device can be used for stripping the corresponding battery cells in different cycle endurance stages, so as to evaluate and analyze the safety, performance and disassembly of the battery cells in different cycle stages.

Description

Technical Field

[0001] The present invention relates to the field of vehicle batteries, in particular to a battery testing device and a testing system and a testing method having the battery testing device. Background Art

[0002] With the development of the new energy market, the proportion of power batteries in passenger cars is increasing, and the integration technology of power batteries is becoming more and more mature. From the traditional battery cell integration to small modules, large modules and the current ultra-long modules or module-free structures, it can be seen that this module-free integration technology is the trend of future development.

[0003] This highly integrated design continuously improves the space utilization inside the battery pack, increases the volume energy density of the battery system, further increases the vehicle's load capacity, and increases the vehicle's range.

[0004] This structure of extra-long modules or no modules also weakens the module division in the whole package. When the cycle durability of the battery pack is evaluated, the whole package needs to be tested, which will take up more test resources and increase the cost of testing.

[0005] Moreover, due to this module-free design, the battery cell is connected to the liquid cooling plate through a thermally conductive structural adhesive. Therefore, the battery cell cannot be disassembled during the cycle process to analyze the lithium deposition of the battery cell during the process.

[0006] In the field of battery module testing, existing testing tools have certain limitations.

[0007] For example, traditional testing tools are usually only applicable to battery modules of a specific size and have poor versatility.

[0008] Existing testing equipment often cannot accurately simulate the temperature environment and mechanical constraints of batteries in actual use.

[0009] Traditional testing methods usually require testing the entire battery module. For the cycle durability test of the battery module, the existing equipment is unable to disassemble and analyze the battery cells at different cycle stages; this limits the in-depth study of the battery health status and makes it difficult to optimize the battery management strategy.

[0010] The existing patent 202221119554.X - A simulation test device for a battery cell module does not clearly disclose the technical content for solving the above-mentioned technical problems.

[0011] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery cell module testing device. Summary of the invention

[0012] The object of the present invention is to provide a test device for batteries, which has a wide range of applications and can realize the cyclic test of the battery cell module at low cost.

[0013] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0014] A test device for batteries includes a bottom support plate; a fixing structure is provided on the bottom support plate;

[0015] The fixing structure includes two end plates distributed at intervals;

[0016] The fixing structure further includes at least one isolation end plate; each isolation end plate is arranged in the area between the two end plates; a placement groove is formed between adjacent isolation end plates or between an isolation end plate and an adjacent end plate.

[0017] The interior of the bottom support plate is hollow, and a liquid inlet and outlet and a liquid outlet are provided on the bottom support plate.

[0018] The test device further includes a heat preservation and insulation assembly for heat preservation and protection of the battery cell module to be tested.

[0019] The test device further includes a bus bar sampling assembly for series connection between the battery cells to be tested.

[0020] The end plate or / and the isolation end plate are connected to the bottom support plate by a detachable connection method.

[0021] A test system includes the test device for batteries, and the test device for batteries is connected to a test equipment.

[0022] A test method for the test system includes the following steps:

[0023] Step 1: Determine the parameters of the battery cell module to be tested;

[0024] Step 2: Assemble the test device for batteries according to the parameters of the battery cell module to be tested;

[0025] Step 3: Install the battery cell module in the corresponding test device for batteries; then connect and communicate between the battery cells in the battery cell module; form the battery module to be tested;

[0026] Step 4: Connect the battery module to be tested in Step 3 to the test equipment; perform test operations on the battery module to be tested through the test equipment;

[0027] Step 5: Record the measurement data in Step 4.

[0028] In step 1, the battery cell module includes a plurality of single battery cell modules; each single battery cell module includes a plurality of single battery cells; each single battery cell module is arranged in a corresponding placement groove in the battery testing device.

[0029] In step 4, it is required that the battery module to be tested can perform a cycle test.

[0030] It is required that after a single single battery cell module is removed, the remaining single battery cell modules can continue to perform a cycle test.

[0031] The advantages of the present invention are as follows:

[0032] The present invention discloses a battery testing device, a testing system and a testing method having the battery testing device.

[0033] The testing device disclosed by the present invention can simulate the stress, cooling or heating conditions of the battery cell module in the whole package, so that it can conveniently replace the whole package to perform a cycle test.

[0034] And through this testing device, the peeling of the battery cells corresponding to different cycle durability stages can be realized, so as to realize the evaluation and analysis of the safety, performance and disassembly of the battery cells in different cycle stages; at the same time, the number of single battery cells used in the above cycle is relatively low, and the battery cell module in the previous cycle can be partially continued to be used in the next cycle, which not only reduces the testing time, but also reduces the number of single battery cells used during the test; reduces the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0036] Figure 1 It is the general assembly drawing of the testing device of the present invention equipped with the battery module to be tested.

[0037] Figure 2 It is the structural schematic diagram of the testing device in the present invention.

[0038] Figure 3 It is the cross-sectional view of the testing device in the present invention.

[0039] Figure 4 It is the schematic diagram of the testing system in the present invention.

[0040] The marks in the above drawings are all:

[0041] 1. Bottom support plate, 2. End plate, 3. Isolation end plate, 4. Liquid inlet, 5. Liquid outlet, 6. Battery module to be tested, 7. Thermal insulation and insulation component, 8. Busbar sampling component. DETAILED DESCRIPTION OF THE INVENTION

[0042] The following is a further detailed description of the specific implementation of the present invention by describing the optimal embodiments with reference to the accompanying drawings.

[0043] A test device for a battery includes a bottom support plate 1; a fixing structure is provided on the bottom support plate 1; the fixing structure includes two end plates 2 spaced apart; the fixing structure further includes at least one isolation end plate 3; each isolation end plate 3 is arranged in the area between the two end plates 2; an installation groove is formed between adjacent isolation end plates 3 or between an isolation end plate 3 and an adjacent end plate 2; the test device disclosed in the present invention can simulate the stress, cooling or heating conditions of the battery cell module in the whole package, so that it can conveniently replace the whole package for cycle testing.

[0044] And through this test device, the peeling of the battery cells corresponding to different cycle durability stages can be realized, so as to realize the evaluation and analysis of the safety, performance and disassembly of the battery cells in different cycle stages; at the same time, the number of single battery cells used in the above cycle is relatively low, and the battery cell module in the previous cycle can be partially continued to be used in the next cycle, which not only reduces the test time, but also reduces the number of single battery cells used during the test; reducing the test cost.

[0045] In the present invention, the bottom support plate 1 is used as the basic component of the whole test device to carry the battery cell module.

[0046] The bottom support plate 1 is hollow inside and is designed with a liquid inlet 4 and a liquid outlet 5 for the circulation of the coolant or heating liquid, so as to realize the temperature control of the battery cell module.

[0047] This design can simulate the thermal management environment of the battery in actual use and ensure that the test conditions are close to the vehicle working conditions.

[0048] The fixing structure is mainly used for restraining and limiting the battery cell module; specifically, in the present invention, the fixing structure includes end plates 2: the two end plates 2 are spaced apart and are located at both ends of the bottom support plate 1.

[0049] They are the main components of the fixing structure and are used to fix both ends of the battery cell module.

[0050] Isolation end plate 3: at least one isolation end plate 3 is arranged in the area between the two end plates 2; the function of the isolation end plate 3 is to divide the battery cell module into multiple independent areas.

[0051] Installation groove: an installation groove is formed between adjacent isolation end plates 3 or between an isolation end plate 3 and an adjacent end plate 2; these grooves are used to place single battery cell modules, and each groove can accommodate one single battery cell module or multiple single battery cells.

[0052] Through the combination of the end plate 2 and the isolation plate 3, the battery cell module is divided into multiple independent areas, and each area can be tested independently.

[0053] This partition design allows the disassembly and analysis of the battery cells in a specific area at different cycle stages without affecting the testing of other areas, thus improving the flexibility and efficiency of testing.

[0054] Detachable connection: The end plate 2 and the isolation plate 3 are fixed on the bottom support plate 1 through a detachable connection method.

[0055] This design facilitates the installation and disassembly of the battery cell module and also conveniently adjusts the number and position of the partitions according to different testing requirements.

[0056] The bottom support plate 1 is hollow inside, and the circulation of the coolant or heating liquid is realized through the liquid inlet 4 and the liquid outlet 5, thereby heating or cooling the battery cell module; this design can simulate the actual thermal management environment of the battery in the vehicle, making the test results closer to the actual usage conditions.

[0057] The design of this test device has high versatility and can be applicable to battery cell modules of different sizes and types. Only the positions of the end plate 2 and the isolation plate 3 need to be adjusted according to the parameters of the battery cell module.

[0058] Furthermore, in the present invention, the bottom support plate 1 is hollow inside, and the bottom support plate 1 is provided with a liquid inlet and a liquid outlet; Structural feature: The inside of the bottom support plate 1 is hollow, which means there is one or more channels inside for the flow of liquid.

[0059] Liquid inlet 4 and liquid outlet 5: The bottom support plate 1 is provided with a liquid inlet 4 and a liquid outlet 5, and these two interfaces are used to connect to an external liquid circulation system (such as a liquid cooling unit or a heating system).

[0060] Cooling or heating function: By circulating the coolant or heating liquid in the hollow channel, the temperature of the battery cell module placed on the support plate can be controlled.

[0061] This design can simulate the thermal management environment of the battery in actual use and ensure that the test conditions are close to the vehicle operating conditions.

[0062] Cooling function: During the charge and discharge process of the battery, the battery cells generate heat. By circulating the coolant, the temperature of the battery cells can be effectively reduced, preventing performance degradation or safety hazards caused by overheating; in a low-temperature environment, the performance of the battery is limited. By circulating the heating liquid, the temperature of the battery cells can be raised to a suitable operating range to ensure the performance of the battery under low-temperature conditions.

[0063] Based on the above design, the actual working conditions of the battery cell module can be simulated: approaching the vehicle environment: the liquid circulation function of the bottom support plate 1 can simulate the thermal management environment of the battery in the vehicle, making the test results closer to the actual use situation.

[0064] This is crucial for evaluating the performance and safety of the battery under different working conditions; meanwhile, during the cycle test, the temperature of the coolant or heating liquid can be dynamically adjusted according to the temperature change of the battery cell to ensure the stability and reliability of the test environment.

[0065] Furthermore, in the present invention, the test device further includes a heat preservation and insulation component 7 for heat preservation and protection of the battery cell module to be tested; the heat preservation and insulation component 7 is usually made of materials with high thermal conductivity and low thermal expansion coefficient, such as polyimide (PI) film, silica gel insulation pad, etc.; by reducing the heat exchange between the battery cell module and the external environment during the test, it is ensured that the battery cell module maintains a relatively stable temperature environment during the test.

[0066] This is crucial for simulating the thermal management effect of the battery in actual use.

[0067] The heat preservation and insulation component 7 not only provides heat preservation effect, but also has good electrical insulation performance, preventing the battery cell module from short - circuiting or leaking electricity during the test; through the insulation design, the safety of the test operators and equipment is ensured, and potential safety hazards caused by electrical faults are avoided.

[0068] The heat preservation and insulation component 7 is usually installed on the side and bottom of the battery cell module, and is used in cooperation with the liquid - cooled plate assembly to form a relatively enclosed test environment.

[0069] Through the heat preservation design, the influence of external environmental temperature changes on the battery cell module is reduced, making the test data closer to the actual working conditions.

[0070] The insulation design effectively prevents electrical faults and ensures the safety of the test process.

[0071] The heat preservation and insulation component 7 cooperates with the liquid - cooled plate assembly to simulate the thermal management environment of the battery in the vehicle and improve the reliability of the test results.

[0072] Furthermore, in the present invention, the test device further includes a busbar sampling component 8 for series connection between the battery cells to be tested.

[0073] In addition, it should be stated here that the heat preservation and insulation component 7 and the busbar sampling component 8 of the present invention can adopt the structures in existing battery packs. Here, it is only for better simulating the actual working conditions of the battery cells to be tested, the battery cell modules to be tested or the battery cell modules; specific models and sizes can be selected by the operator as needed.

[0074] The busbar is usually made of materials with good electrical conductivity, such as aluminum alloy or copper alloy; it is used to connect multiple single cells in series or parallel to form a complete battery module circuit.

[0075] The busbar can carry a large current to ensure stable and reliable electrical connection between the cells.

[0076] Voltage sampling: By setting sampling points on the busbar, the voltage change of each single cell can be monitored in real time.

[0077] The sampling points can be connected to the data acquisition system through a flexible printed circuit (FPC) or a traditional wire harness.

[0078] Install temperature sensors on the surface of the busbar or the cells to monitor the temperature change of the cells in real time, ensuring that the temperature state of the cells is always within the controllable range during the test.

[0079] The busbar sampling component 8 is fixed on the cell module by screwing or welding to ensure the firmness of the electrical connection.

[0080] The sampling wire is wrapped by insulation protection measures (such as insulating ceramic silicone tape) to prevent short circuit or electric leakage.

[0081] Through voltage and temperature sampling, the operation state data of the cell module can be obtained in real time, providing an accurate basis for test analysis.

[0082] The busbar design simplifies the electrical connection between the cells, reducing the test preparation time and operation complexity.

[0083] Through insulation protection measures, the safety of the electrical connection during the test is ensured, preventing short circuit or electric leakage accidents.

[0084] In the present invention, the heat preservation and insulation component 7 and the busbar sampling component 8 together constitute a complete test environment, ensuring that the cell module can maintain a stable temperature state during the test, and at the same time realizing accurate electrical connection and data acquisition.

[0085] Furthermore, in the present invention, the end plate 2 or / and the isolation plate 3 are connected to the bottom support plate 1 by a detachable connection method; in the battery test device, the end plate 2 and the isolation plate 3 adopt a detachable connection method, which can improve the flexibility and versatility of the device. This design allows the layout of the cell module to be quickly adjusted according to different test requirements, and at the same time is convenient for installing and disassembling the cell module.

[0086] Specific connection method: Bolt connection can be selected: The end plate 2 and the isolation plate 3 can be connected to the bottom support plate 1 by bolts. This connection method is simple and reliable, convenient for quick disassembly and assembly, and can withstand a certain mechanical stress.

[0087] A snap-fit structure can also be selected: in some designs, a snap-fit structure is adopted, and the end plate and the support plate are fixed through a snap-fit boss and a snap-fit port; this structure not only ensures the connection stability but also further improves the convenience of disassembly and assembly.

[0088] The detachable connection method allows adjusting the positions of the end plate and the isolation end plate 3 according to the test requirements to adapt to different sizes and quantities of battery cell modules.

[0089] After the test is completed, disassemble the device and take out the battery cell module to improve the reuse rate of the device.

[0090] A test system includes the above-mentioned test device for batteries, and the test device for batteries is connected to test equipment; in the present invention, the test device for batteries mainly includes a bottom support plate 1: which is hollow inside, used for liquid circulation (cooling or heating), and is provided with a liquid inlet 4 and a liquid outlet 5.

[0091] Fixing structure: includes an end plate 2 and an isolation end plate 3, which are fixed on the bottom support plate 1 through a detachable connection method to form a plurality of placement grooves for placing battery cell modules.

[0092] Thermal insulation and electrical insulation component 7: used for thermal insulation and electrical insulation to ensure temperature stability and electrical safety during the test process.

[0093] Busbar sampling component 8: used for electrical connection between battery cells and voltage and temperature sampling to ensure the accuracy of data collection.

[0094] The test equipment mainly includes:

[0095] Charge and discharge test equipment: used to perform charge and discharge operations on the battery cell module to simulate the actual use conditions of the battery.

[0096] Liquid cooling unit: provides coolant or heating liquid, which circulates through the liquid inlet 4 and the liquid outlet 5 of the bottom support plate 1 to achieve temperature control of the battery cell module.

[0097] Data acquisition system: used to collect data such as voltage and temperature of the battery cell module, and analyze and record them through a host computer.

[0098] Control equipment: used to control the entire test process, including charge and discharge parameter setting, temperature adjustment, data recording, etc.

[0099] Functions of the test system:

[0100] Through the liquid circulation function of the bottom support plate 1 and the thermal insulation and electrical insulation component 7, the test system can simulate the thermal management environment of the battery in the vehicle to ensure that the test conditions are close to the actual use situation.

[0101] The partition design of the test device (through the isolation end plate 3 and the end end plate 2) allows independent testing of the battery cell modules in different areas. At different cycle stages, some battery cell modules can be disassembled for analysis without affecting the testing of other areas.

[0102] The busbar sampling component 8 can collect the voltage and temperature data of the battery cell module in real time, and analyze it through the data acquisition system and the host computer, providing accurate data support for battery performance evaluation.

[0103] Cyclic testing and cost optimization: The test device supports cyclic testing. Even if some battery cell modules are removed, the remaining part can still continue to be tested; this design reduces the number of single battery cells required for testing and lowers the testing cost.

[0104] Advantages of the test system:

[0105] High efficiency: The partition design and the detachable connection method improve the testing efficiency, reducing the testing preparation time and operation complexity.

[0106] Accuracy: By simulating real working conditions and real-time data acquisition, the test system can provide accurate test results, providing reliable data support for battery R & D and optimization.

[0107] Economy: By optimizing the testing process and reducing the number of single battery cells used, the test system reduces the testing cost and improves the reuse rate of the test device at the same time.

[0108] Versatility: The design of the test device has high versatility, is applicable to various types of battery cell modules, and can meet different testing requirements.

[0109] A testing method for the said test system, the testing method comprising the following steps:

[0110] Step 1: Determine the parameters of the battery cell module 6 to be tested;

[0111] Step 2: Assemble the test device for the battery according to the parameters of the battery cell module 6 to be tested;

[0112] Step 3: Install the battery cell module in the corresponding test device for the battery; then connect and communicate between the single battery cells in the battery cell module; form the battery module to be tested;

[0113] Step 4: Connect the battery module to be tested in Step 3 to the test equipment; perform test operations on the battery module to be tested through the test equipment;

[0114] Step 5: Record the data measured in Step 4.

[0115] Based on the above testing method, the present invention can implement the testing operation for the corresponding battery cell module 6 to be tested.

[0116] Step 1: Determine the parameters of the battery cell module 6 to be tested

[0117] Parameter content: Type of single battery cell: soft-pack battery cell, hard-shell battery cell or other types.

[0118] Dimensions of the single battery cell module: Physical dimensions such as length, width, height, etc.

[0119] Number of battery cells: The number of single battery cells and the composition method of the module (such as series or parallel).

[0120] Test requirements: Such as temperature range, charge-discharge rate, number of cycles, etc.

[0121] Safety requirements: Such as upper and lower limits of voltage and current, temperature alarm threshold, etc.

[0122] By clarifying the parameters of the battery cell module, it provides a basis for the subsequent assembly of the test device and the test process, ensuring the accuracy and safety of the test.

[0123] Step 2: Assemble the test device for the battery according to the parameters of the battery cell module 6 to be tested

[0124] Adjust the positions of the end plates 2 and the isolation end plates 3: According to the dimensions and number of the battery cell module, adjust the positions of the end plates and the isolation end plates 3 to form a suitable placement groove.

[0125] Install the thermal insulation and insulation component 7: Ensure that the battery cell module has good thermal insulation and insulation performance during the test.

[0126] Configure the busbar sampling component 8: According to the connection method of the battery cell module, install the busbar and set the voltage and temperature sampling points.

[0127] Through customized assembly, ensure that the test device can adapt to different types of battery cell modules, improving the versatility and flexibility of the test device.

[0128] Step 3: Install the battery cell module in the corresponding test device for the battery

[0129] Place the battery cell module: Place the battery cell modules one by one in the placement groove of the test device.

[0130] Connect the single battery cells: Electrically connect the single battery cells through the busbar to ensure that the series or parallel relationship of the module meets the test requirements.

[0131] Confirm that the connection between the single battery cells is firm and the sampling points of the busbar sampling component 8 are normally connected to the data acquisition system.

[0132] Ensure that the battery cell module is correctly installed in the test device and the electrical connection is reliable, providing a stable basis for the subsequent test.

[0133] Step 4: Connect the battery module to be tested to the test equipment; perform the test operation

[0134] Connect to the test equipment: Connect the charging and discharging equipment: Connect the output terminal of the battery cell module to the high-voltage wire harness of the charging and discharging equipment.

[0135] Connect the liquid cooling unit: Connect the liquid inlet 4 and the liquid outlet 5 of the bottom support plate 1 to the pipeline of the liquid cooling unit to ensure the normal operation of the temperature control system.

[0136] Connect the data acquisition system: Connect the sampling line of the busbar sampling component 8 to the data acquisition system for real-time monitoring of the voltage and temperature of the battery cells.

[0137] Test operation:

[0138] Set test parameters: Set test parameters such as charge and discharge rate, temperature range, number of cycles, etc. on the control equipment.

[0139] Start the test: Start the charging and discharging equipment and the liquid cooling unit to start the test cycle.

[0140] Dynamic adjustment: Dynamically adjust the test parameters (such as coolant temperature, charge and discharge current, etc.) according to the real-time collected data to ensure that the test process meets the predetermined requirements.

[0141] Through the complete connection of the test equipment and parameter setting, ensure that the test process can simulate the actual use conditions of the battery cell module and obtain accurate test data.

[0142] Step 5: Record the measured data

[0143] Contents of data recording:

[0144] Voltage data: Record the voltage changes of each single battery cell.

[0145] Temperature data: Record the temperature changes on the surface of the battery cells and inside the module.

[0146] Charge and discharge curve: Record the charge and discharge current, voltage and capacity changes of the battery cell module.

[0147] Cycle life data: Record the performance changes of the battery cell module at different cycle stages.

[0148] Data processing:

[0149] Real-time monitoring: Real-time display of the test data through the upper computer to promptly detect abnormal situations.

[0150] Data storage: Store the test data in a computer or in the cloud for subsequent analysis.

[0151] Data analysis: Statistical analysis is performed on the test data to evaluate the performance and durability of the battery cell module.

[0152] Through detailed data recording and analysis, it provides a scientific basis for the performance evaluation, optimized design, and quality control of the battery cell module.

[0153] Furthermore, in step 1 of the present invention, the battery cell module described includes a plurality of single-cell modules; each single-cell module includes a plurality of single cells; each single-cell module is arranged in a corresponding placement groove in the battery test device; each battery cell module is composed of a plurality of single cells; these single cells can be in the form of series connection, parallel connection, or series-parallel combination, specifically depending on the design requirements of the battery.

[0154] Multiple single-cell modules: The entire battery cell module 6 to be tested is composed of a plurality of single-cell modules, forming a larger battery module or battery pack.

[0155] Layout of the battery cell module: Each single-cell module is placed in the placement groove of the test device; these grooves are formed by the end end plate 2 and the isolation end plate 3, which are used to fix and isolate different single-cell modules.

[0156] Through partition design, after one measurement, the corresponding single-cell module can be removed; then subsequent measurements can be continued, so as to achieve the peeling of the battery cells corresponding to different cycle durability stages, in order to realize the safety, performance, and disassembly evaluation and analysis of the battery cells in different cycle stages; at the same time, the number of single cells used in the above-mentioned cycle is relatively low, and the battery cell module of the previous cycle can be partially continued for the next cycle, which not only reduces the test time, but also reduces the number of single cells used during the test; reducing the test cost.

[0157] In the present invention, the placement groove is used to fix each single-cell module to ensure its stability during the test.

[0158] At the same time, the single-cell modules are separated by the isolation end plate 3, which is convenient for disassembling and analyzing the battery cells in a specific area at different cycle stages without affecting the tests in other areas.

[0159] In step 4 of the present invention, it is required that the battery module to be tested can perform a cycle test; after a single single-cell module is removed, the remaining single-cell modules can continue to perform a cycle test; in step 4, it is required that the battery module to be tested can perform a cycle test.

[0160] This means that the battery module needs to perform multiple charge and discharge cycles under specific charge and discharge conditions to evaluate its performance changes during repeated use; the purpose of the cycle test is to monitor key performance indicators such as the capacity attenuation, internal resistance change, and Coulomb efficiency of the battery module, so as to evaluate its cycle life and health status.

[0161] Test requirements after removing a single-cell module: During the cycling test, it is required that a single-cell module can be removed, while the remaining cell modules can still continue the cycling test. The advantage of this design allows for disassembly and analysis of specific cell modules at different cycling stages, such as checking for lithium plating or internal structure changes in the cells.

[0162] After removing some modules, the remaining modules can still continue the test, ensuring the continuity and integrity of the test process.

[0163] By comparing the performance of cell modules at different cycling stages, the durability and performance degradation trend of the battery module can be evaluated more accurately.

[0164] Specifically:

[0165] The present invention discloses a test device for batteries, which mainly includes a bottom support plate 1; a fixing structure is provided on the bottom support plate 1; the fixing structure includes two end plates 2 distributed at intervals; the fixing structure further includes at least one isolation end plate 3; each isolation end plate 3 is arranged in the area between the two end plates 2; an installation groove is formed between adjacent isolation end plates 3 or between an isolation end plate 3 and an adjacent end plate 2.

[0166] The end plates 2 are further divided into a front fixing end plate and a rear fixing end plate according to their arrangement positions; in the present invention, the two end plates 2 are used to fix and restrain the cell array, so as to simulate the constrained stress situation of the cells in the whole package.

[0167] After the cells are stacked, by adding isolation end plates 3 between the cells, the cells can be divided into different areas according to the test requirements.

[0168] The cells are electrically connected through a busbar sampling assembly 8 to sample the voltage and temperature of the cells, and the cells after the busbar connection are connected to the high-voltage wire harness of an external charge and discharge device through output terminals to achieve battery charge and discharge tests.

[0169] In addition, an insulating ceramic silicone tape is attached to the cell busbar to achieve electrical isolation and ensure the safety of the test operation.

[0170] A bottom support plate 1 is provided at the bottom of the cell module, which is used for cooling and heating the battery during charge and discharge.

[0171] Heat insulation and insulation components 7 can be added on both sides of the cell module 6 to be tested to simulate the heat dissipation situation around the modules in the battery pack and ensure insulation safety during the battery test process.

[0172] Such as Figure 2 and Figure 3As shown, the front fixing end plate, rear fixing end plate, and isolation end plate 3 for constraining and isolating the single cell module are fixed to the bottom support plate 1 by bolts.

[0173] In addition, the tested cell module can be connected to the bottom support plate 1 through a thermally conductive structural adhesive or a thermally conductive silicone pad.

[0174] In addition, the bottom support plate 1 also integrates a liquid cooling component, which is provided with a liquid inlet and a liquid outlet on one side to facilitate the passage of coolant during the test.

[0175] Figure 3 Shown is a cross-sectional schematic diagram of the test module tooling, which is the flow channel design of the bottom support plate 1. Its design is similar to the liquid cooling plate design of the battery pack to ensure effective heating and cooling of the cells during the test.

[0176] Figure 4 Shows a schematic diagram of the components of the module cycle test system, which includes the integrated and installed test tooling module, a liquid cooling unit for heating and cooling the battery, a charge and discharge test device for battery charging and discharging, a host computer and a test acquisition tooling for sampling the cell temperature and voltage, and a test control device.

[0177] As Figure 1 shown, the tested cell modules are stacked and placed on the bottom support plate 1. A thermally conductive structural adhesive or a thermally conductive silicone pad can be added between the bottom of the cell module and the bottom support plate 1 according to the battery grouping design method at the whole pack level.

[0178] The cell module and Figure 2 the reserved placement grooves of the front fixing end plate, rear fixing end plate, and isolation end plate 3 shown in are consistent with the gap state of the cell module in the whole pack.

[0179] The stacked and fixed cell modules are connected through Figure 1 the busbar sampling component 8 in and output pole columns are connected on both sides to facilitate connection to the charge and discharge equipment through high-voltage wire harnesses.

[0180] The assembled test device and other equipment form a cycle test system for the battery module. As Figure 4 shown, the liquid cooling unit is connected to the Figure 2 liquid inlet and liquid outlet of the test device shown for cooling or heating the cell module.

[0181] After the test system is assembled, according to the whole pack simulation test steps, set the test process on the control device, and the charge and discharge equipment performs the charge and discharge.

[0182] During the charging stage, the initial coolant temperature provided by the liquid cooling unit is stable. As the battery charging progresses, according to the test sampling tooling and the upper computer display of the battery temperature change, the coolant temperature is adjusted according to the actual heat pipe strategy to meet the thermal management requirements.

[0183] During the cyclic test, according to the requirements of the test cycle times, the battery cells on one side of the middle isolation end plate 3 can be removed Figure 2 for the evaluation of the safety and electrical performance of the battery cells in different cycle stages.

[0184] Due to Figure 2 the setting of the middle isolation end plate 3, the removed single battery cell module will not affect the battery cells on the other side. After welding the remaining battery cells Figure 1 to the output terminal post in it, the cyclic durability test can continue.

[0185] The test device disclosed in the present invention can simulate the stress, cooling or heating conditions of a single battery cell in a whole pack, enabling it to conveniently replace the whole pack for cyclic testing.

[0186] And through this test device, the peeling of battery cells in different cyclic durability stages can be realized to achieve the evaluation and analysis of the safety, performance and disassembly of battery cells in different cycle stages.

[0187] In the present invention, the end end plate 2 and the isolation end plate 3 of the test device are fixed on the bottom support plate 1 through mounting holes. The end end plate 2 and the isolation end plate 3 can divide the stacked single battery cells into multiple functional areas, so as to disassemble the single battery cells in a certain area during the test without affecting the single battery cells in other areas.

[0188] The busbar sampling component 8 includes a sampling component and a current-carrying aluminum bar component. Its sampling line can adopt FPC or wire harness, and the fixing of the sampling point can adopt the methods of screwing or welding.

[0189] The thermal insulation component 7 can play the role of insulating protection and heat preservation for the battery cells.

[0190] The test device, test system and test method proposed by the present invention can realize the safety and performance evaluation of battery cells in different cycle stages.

[0191] By conducting the cyclic durability test of the battery cell module on this test device, the present invention can realize the removal of the corresponding battery cells in different cycle stages without affecting other cyclic tests.

[0192] The independent safety and performance test evaluation of the battery cells in different cyclic durability stages proposed by the present invention, and its evaluation data can be used to better optimize the management strategy of battery health and improve the safety of battery use.

[0193] The test device proposed by the present invention can effectively simulate the usage environment of the battery in the whole pack, improve the convenience of the battery cycle test, reduce the test cost, and shorten the test cycle.

[0194] The test device described in the present invention is configured with a liquid cooling structure and a thermal insulation and insulation component 7, which can conveniently simulate the usage environment of the battery in the whole pack, making the test data closer to the cycle results of the whole pack.

[0195] The thermal insulation and insulation component 7 in the test device of the present invention can reduce the influence of the external environment and can achieve electrical safety protection during the test.

[0196] By arranging a plurality of end end plates 2 or isolation end plates 3, the test device described in the present invention can achieve the allocation of the number of stacked battery cells in different regions and can reduce the mutual interference when the battery cells are removed.

[0197] The busbar sampling component 8 of the present invention can achieve the series connection of battery cells in different regions and is pasted with an insulating ceramic silicone tape for insulation protection to achieve safety protection during the test.

[0198] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A battery testing device, characterized in that: It includes a bottom support plate; the bottom support plate is provided with a fixing structure; The fixing structure includes two end plates spaced apart from each other; The fixing structure further comprises at least one isolating end plate; each isolating end plate is arranged in the area between two end end plates; and a placement groove is formed between adjacent isolating end plates or between an isolating end plate and an adjacent end end plate.

2. A battery testing device according to claim 1, characterized in that: The bottom support plate is hollow inside and is provided with a liquid inlet and a liquid outlet.

3. A battery testing device according to claim 1, characterized in that: The testing device also includes a thermal insulation component for thermal insulation protection of the battery core module to be tested.

4. A battery testing device according to claim 1, characterized in that: The testing device also includes a bus sampling assembly connected in series between the single cells to be tested.

5. A battery testing device according to claim 1, characterized in that: The end plate and / or the isolation end plate are connected to the bottom support plate in a detachable connection manner.

6. A testing system, characterized in that: The invention comprises a battery testing device as claimed in any one of claims 1 to 5, wherein the battery testing device is connected to a testing device.

7. A testing method using the testing system as claimed in claim 6, characterized in that: The testing method comprises the following steps: Step 1: Determine the parameters of the battery module to be tested; Step 2: Assemble the battery test device according to the parameters of the battery module to be tested; Step 3: Install the battery module on the corresponding battery test device; then connect and communicate the single cells in the battery module to form a battery module to be tested; Step 4: Connect the battery module to be tested in step 3 to the test equipment; perform test operations on the battery module to be tested through the test equipment; Step 5: Record the data measured in step 4.

8. The testing method of the battery testing device according to claim 7, characterized in that: The battery cell module in step 1 includes a plurality of single-cell battery modules; each single-cell battery module includes a plurality of single-cell batteries; each single-cell battery module is arranged in a corresponding placement groove in the battery testing device.

9. The testing method of the battery testing device according to claim 8, characterized in that: In step 4, it is required that the battery module to be tested can be subjected to cycle testing.

10. The testing method of the battery testing device according to claim 9, characterized in that: It is required that after a single battery cell module is dismantled, the remaining battery cell modules can continue to undergo cycle testing.

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