Method, device and equipment for testing expansive force of battery module and storage medium
By constructing a simulation model and modifying the battery module testing device, the problem of inaccurate expansion force data in the existing technology was solved, and accurate expansion force measurement in the whole vehicle environment was realized, thereby improving the performance and safety of the battery module.
Patent Information
- Application Number
- CN202511550556.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-01-09
AI Technical Summary
Existing battery module expansion force testing devices and methods cannot accurately simulate the environment under real vehicle usage conditions, resulting in inaccurate expansion force data, which affects battery design optimization and safety assessment.
By constructing a simulation model, the location of the maximum cross-sectional force of the battery module is determined. The modified battery module is then tested in a simulated vehicle environment. Combined with an expansion force sensor and a water cooling system, charge-discharge cycles are performed to obtain accurate expansion force data.
This improves the reliability and accuracy of expansion force data, ensuring the accuracy of expansion force measurement and prediction throughout the battery module's life cycle, thereby enhancing battery performance and safety.
Smart Images
Figure CN121298084A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of batteries, in particular to a battery module expansion force testing method, device, equipment and storage medium. BACKGROUND
[0002] With the rapid development of the new energy vehicle industry, the performance requirements for battery modules are increasing. A battery module is composed of multiple orderly arranged battery cells. These battery cells will expand on the surface during the charging and discharging process, thereby exerting pressure on adjacent battery cells or battery box beams. Therefore, in the structural design of a battery system, accurate measurement and prediction of the battery cell expansion force throughout the life cycle are extremely critical, directly affecting the performance and safety of the battery. Various testing devices and methods have been developed to measure the expansion force of the battery shell.
[0003] However, the existing testing devices and methods often cannot completely simulate the environment of the battery under actual vehicle use conditions during actual testing, resulting in inaccuracy of the obtained battery cell expansion force data. This deviation in data affects the optimization of battery design and the accuracy of safety evaluation. SUMMARY
[0004] Therefore, the embodiments of the present application provide a battery module expansion force testing method, device, equipment and storage medium, which improves the reliability and accuracy of the expansion force data by testing the modified battery module in a simulated whole vehicle environment.
[0005] The present application mainly includes the following aspects: In a first aspect, the embodiments of the present application provide a battery module expansion force testing method, wherein the battery module includes multiple battery cells and multiple water cooling plates for adjusting the temperature of the battery module, and the water cooling plates are fixed with cooling water pipes; The testing method includes: determining the position of the maximum cross-sectional force of the battery module based on a first simulation model for determining the cross-sectional force of the battery module; controlling the liquid in the cooling water pipes to cool the battery module according to a preset flow rate, while performing a charging and discharging cycle on the battery module; During the charging and discharging cycle of the battery module, an expansion force sensor arranged at the position of the maximum cross-sectional force of the battery module is used to determine the expansion force of the battery module; wherein the expansion force sensor is a new device replacing the battery cells and water cooling plates at the original position of the maximum cross-sectional force of the battery module.
[0006] Further, the determination of the position of the maximum cross-sectional force of the battery module based on the first simulation model for determining the cross-sectional force of the battery module includes: constructing a first simulation model for determining the cross-sectional force of the battery module; obtaining a plurality of cross-sectional forces of the battery module by performing charge-discharge cycles on the first simulation model; selecting a maximum cross-sectional force from the plurality of cross-sectional forces of the battery module to determine a position of the battery module with the maximum cross-sectional force.
[0007] Further, the test method further comprises: obtaining an expansion force of the battery module according to a standard period in each charge-discharge cycle; wherein the standard period is determined by the following manner: for each test period of the plurality of test periods, determining a difference between the maximum expansion force obtained according to the test period and the maximum expansion force obtained according to the preset period as an expansion force difference corresponding to the test period; selecting at least one expansion force difference within a preset difference range from the expansion force differences corresponding to all test periods; determining a test period corresponding to the smallest expansion force difference in the selected expansion force differences as the standard period.
[0008] Further, the test method further comprises: constructing a second simulation model for determining a deformation variable of a first connection region between the battery module and a vehicle body structure; obtaining a deformation variable of the first connection region by applying a preset force at the first connection region in the second simulation model; constructing a third simulation model for determining a deformation variable of a second connection region between the battery module and a battery clamp; for each area test value of a plurality of area test values of a cross-sectional area of a beam of the battery clamp, obtaining a deformation variable of the second connection region corresponding to the area test value by applying a preset force at the second connection region in the third simulation model and by setting the cross-sectional area of the beam in the third simulation model as the area test value; determining a cross-sectional area value of the beam of the battery clamp based on the deformation variable of the first connection region and the deformation variables of the second connection region corresponding to all area test values, so that the battery clamp prepared according to the cross-sectional area value of the beam fixes the battery module.
[0009] Further, the determination of the cross-sectional area value of the beam of the battery clamp based on the deformation variable of the first connection region and the deformation variables of the second connection region corresponding to all area test values comprises: determining a difference between the deformation variable of the second connection region corresponding to the area test value and the deformation variable of the first connection region as a deviation corresponding to the area test value; The minimum deviation is selected from deviations corresponding to all area test values, and the area test value corresponding to the selected deviation is determined as the cross-sectional area value of the beam of the battery clamp.
[0010] In a second aspect, the embodiments of the present application also provide a test device for battery module expansion force, the battery module comprising a plurality of battery cells and a plurality of water-cooled plates for adjusting the temperature of the battery module, the water-cooled plates being fixed with cooling water pipes; The test device comprises: A maximum cross-sectional force determination module configured to determine the position of the maximum cross-sectional force of the battery module based on the first simulation model for determining the cross-sectional force of the battery module. A test module configured to control the liquid in the cooling water pipes to cool the battery module at a preset flow rate, and simultaneously perform charging and discharging cycles on the battery module. An expansion force determination module configured to determine the expansion force of the battery module by means of an expansion force sensor arranged at the position of the maximum cross-sectional force of the battery module during the charging and discharging cycles on the battery module, wherein the expansion force sensor is a new device replacing the battery cells and the water-cooled plates at the original position of the maximum cross-sectional force of the battery module.
[0011] Further, the maximum cross-sectional force determination module is specifically configured to: construct a first simulation model for determining the cross-sectional force of the battery module; perform charging and discharging cycles on the first simulation model to obtain a plurality of cross-sectional forces of the battery module; select the maximum cross-sectional force from the plurality of cross-sectional forces of the battery module to determine the position of the maximum cross-sectional force of the battery module.
[0012] Further, the test device further comprises: An acquisition module configured to acquire the expansion force of the battery module according to a standard period in each charging and discharging cycle; The standard period is determined by the following method: For each test period of a plurality of test periods, the difference between the maximum expansion force acquired according to the test period and the maximum expansion force acquired according to a preset period is determined as the expansion force difference corresponding to the test period; At least one expansion force difference within a preset difference range is selected from the expansion force differences corresponding to all test periods; The test period corresponding to the minimum expansion force difference in the selected expansion force differences is determined as the standard period.
[0013] In a third aspect, the embodiments of the present application further provide an electronic device, comprising a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor communicates with the memory through the bus, and the machine readable instructions are executed by the processor to perform the steps of the battery module expansion force testing method in the first aspect or any possible implementation manner of the first aspect.
[0014] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, the computer readable storage medium stores a computer program, and the computer program is executed by a processor to perform the steps of the battery module expansion force testing method in the first aspect or any possible implementation manner of the first aspect.
[0015] The embodiments of the present application provide a battery module expansion force testing method, device, equipment and storage medium, based on the first simulation model for determining the battery module cross-sectional force constructed, the position of the maximum cross-sectional force of the battery module is determined; the liquid in the cooling water pipe is controlled to cool the battery module according to the preset flow, and the battery module is subjected to charging and discharging cycle; in the process of charging and discharging cycle of the battery module, the expansion force of the battery module is determined by the expansion force sensor arranged at the position of the maximum cross-sectional force of the battery module.
[0016] In this way, the reliability and accuracy of the expansion force data are improved by testing the modified battery module in the simulated whole vehicle environment.
[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0019] Figure 1 One of the flowcharts of the battery module expansion force testing method provided by the embodiments of the present application is shown; Figure 2 One of the structural schematic diagrams of the battery module provided by the embodiments of the present application is shown; Figure 3 The second flowchart of the battery module expansion force testing method provided by the embodiments of the present application is shown; Figure 4 Fig. 3 shows a flowchart of a third method for testing the expansion force of a battery module according to an embodiment of the present application; Figure 5 Fig. 4 shows a second structural diagram of a battery module according to an embodiment of the present application; Figure 6 Fig. 5 shows a third structural diagram of a battery module according to an embodiment of the present application; Figure 7 Fig. 6 shows a first structural diagram of a device for testing the expansion force of a battery module according to an embodiment of the present application; Figure 8 Fig. 7 shows a second structural diagram of a device for testing the expansion force of a battery module according to an embodiment of the present application; Figure 9 Fig. 8 shows a structural diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION
[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of description and illustration, and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content of the present application.
[0021] In addition, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0022] The methods, devices, electronic devices or computer readable storage media described in the embodiments of the present application can be applied to any scenario that needs to test the expansion force of a battery module, and the embodiments of the present application do not limit the specific application scenario. Any solution using the method and device for testing the expansion force of a battery module provided by the embodiments of the present application is within the scope of protection of the present application.
[0023] It is worth noting that with the rapid development of the new energy vehicle industry, the performance requirements for battery modules are increasing. A battery module consists of multiple orderly arranged cells. During charging and discharging, these cells expand on their surfaces, exerting pressure on adjacent cells or battery housing beams. Therefore, in battery system structural design, accurate measurement and prediction of cell expansion force throughout the entire life cycle is extremely critical, directly affecting battery performance and safety. Various testing devices and methods have been developed to measure the expansion force of the battery casing. However, existing testing devices and methods often cannot fully simulate the battery's environment under real-world vehicle usage conditions during actual testing, leading to inaccuracies in the obtained cell expansion force data. This data deviation affects the optimization of battery design and the accuracy of safety assessments.
[0024] To address the aforementioned issues, this application proposes a method, apparatus, device, and storage medium for testing the expansion force of a battery module. By testing the modified battery module in a simulated vehicle environment, the reliability and accuracy of the expansion force data are improved.
[0025] To facilitate understanding of this application, the technical solutions provided in this application will be described in detail below with reference to specific embodiments.
[0026] Please see Figure 1 , Figure 1 This is one of the flowcharts for a battery module expansion force test method provided in the embodiments of this application.
[0027] like Figure 1 As shown in the figure, the battery module expansion force testing method provided in this application embodiment includes the following steps: Step S101: Based on the constructed first simulation model for determining the cross-sectional force of the battery module, determine the location of the maximum cross-sectional force of the battery module.
[0028] Here, as Figure 2 As shown, the battery module includes multiple battery cells 13 and multiple water-cooled plates 14 for regulating the temperature of the battery module, wherein cooling water pipes 15 are fixed on the water-cooled plates 14.
[0029] The following is combined Figure 3 Specifically, explain how to determine the location of the maximum cross-sectional force of the battery module based on the first simulation model constructed to determine the cross-sectional force of the battery module.
[0030] Please see Figure 3 , Figure 3 This is a second flowchart of a method for testing the expansion force of a battery module provided in an embodiment of this application.
[0031] like Figure 3As shown, regarding step S101, in a specific implementation, as an example, the following steps may be included: Step S1011: Construct a first simulation model for determining the cross-sectional forces of the battery module.
[0032] Step S1012: By performing charge-discharge cycles on the first simulation model, the forces at multiple cross sections of the battery module are obtained.
[0033] In this embodiment, voltage is used to control the charge / discharge termination condition during charge / discharge cycles. As an example, the charge cut-off voltage can be set to 4.4V, and the discharge cut-off voltage can be set to 2.5V.
[0034] Step S1013: Select the maximum cross-sectional force from multiple cross-sectional forces of the battery module to determine the location of the maximum cross-sectional force of the battery module.
[0035] Please see Figure 4 , Figure 4 This is the third flowchart of a method for testing the expansion force of a battery module provided in an embodiment of this application.
[0036] like Figure 4 As shown in the embodiments of this application, before testing the battery module, the testing method further includes: Step S201: Construct a second simulation model to determine the deformation of the first connection area between the battery module and the vehicle body structure.
[0037] Step S202: Apply a preset force to the first connection region in the second simulation model to obtain the deformation of the first connection region.
[0038] Here, as an example, the preset force can be 1000N.
[0039] Step S203: Construct a third simulation model to determine the deformation of the second connection area between the battery module and the battery clamp 11.
[0040] Here, the battery clamp 11 is used to simulate the stiffness of the vehicle body structure connected to the battery module and to fix it in the direction of battery module expansion. In this embodiment, the existing test device sets the battery module mounting point to be completely free. This application, by simulating the actual connection stiffness of the battery module mounting point, ensures that it matches the actual use environment in the vehicle, and can more accurately simulate the actual boundary conditions, ensuring that the obtained expansion force data is closer to the real situation.
[0041] Step S204: For each of the multiple area test values of the cross-sectional area of the beam of the battery clamp 11, a preset force is applied at the second connection area in the third simulation model, and the cross-sectional area of the beam in the third simulation model is set to the area test value to obtain the deformation of the second connection area corresponding to the area test value.
[0042] Step S205: Based on the deformation of the first connection region and the deformation of the second connection region corresponding to all area test values, determine the cross-sectional area value of the beam of the battery clamp, so as to fix the battery module with the battery clamp 11 prepared according to the cross-sectional area value of the beam.
[0043] Here, as Figure 5 As shown, by adjusting the cross-sectional area of the beam of the battery clamp 11, the deformation of the second connection area is made to approach the deformation of the first connection area, and the battery clamp 11 is located on the side of the battery box 12.
[0044] Regarding step S205, specifically, the difference between the deformation of the second connecting region corresponding to the area test value and the deformation of the first connecting region is determined as the deviation corresponding to the area test value; the smallest deviation is selected from all deviations corresponding to the area test values, and the area test value corresponding to the selected deviation is determined as the cross-sectional area value of the beam of the battery clamp 11. The smallest deviation is less than 5% of the deformation of the first connecting region.
[0045] like Figure 2 As shown in the embodiment of this application, the battery module has been modified. Specifically, the battery cell 13 and the water-cooling plate 14 are removed at the location of the maximum cross-sectional force of the battery module. Figure 2 and Figure 6As shown, in the space formed after the components are removed, a replacement battery cell 17, an expansion force sensor 19, an expansion force sensor clamp 20, a modified cooling water pipe 16, a bridging aluminum busbar (not shown) and an aluminum block (not shown) are installed. As an example, in this application, one water-cooled plate 14 and eight battery cells 13 on both sides of the water-cooled plate are removed, and three replacement battery cells 17 are installed in the corresponding space. The replacement battery cells 17 have the same length, width and height as the original battery cells 13, and the material rigidity is the same as the battery cells. The expansion force sensor 19 is installed on the same side of the replacement battery cells 17 and fixed with the sensor clamp 20. Since part of the water-cooled plate 14 is removed, the original cooling water pipe 15 is disconnected. Therefore, a modified cooling water pipe 16 is used to supplement the connection. The jumper aluminum busbar spans the sensor clamp 20 and the replacement battery cells 17, connecting the replacement battery cells 17 and the original battery cells 13 in high voltage series without interfering with the sampling harness. The thickness of the jumper aluminum busbar is the same as the original aluminum busbar to ensure that the current carrying capacity is the same as the original aluminum busbar. In addition, the equivalent buffer pads 18 on both sides of the replacement battery cell 17 are adjusted to half the thickness of the original buffer pads. The design principle of the equivalent buffer pads 18 is as follows: In the new battery module, since the original battery cell 13 on one side of the water-cooled plate 14 is replaced with an aluminum block that will not deform, the thickness of the equivalent buffer pads 18 on both sides of the replacement battery cell 17 is adjusted to half the thickness of the original buffer pads, and the total number of equivalent buffer pads 18 is the same as the original buffer pads.
[0046] By modifying the battery module as described above, we can accurately and effectively obtain battery module expansion force data with minimal cost and changes, and identify the expansion load characteristics and structural strength performance of the battery module throughout its entire life cycle.
[0047] See again Figure 1 In step S102, the liquid in the cooling water pipe is controlled to cool the battery module according to a preset flow rate, while the battery module is charged and discharged in a cycle.
[0048] Here, this application conducts tests based on actual water-cooled plate cooling strategies. As an example, when the ambient temperature is 20℃, the flow rate of the liquid in the cooling water pipe is 20L / min. Here, the liquid in both the original cooling water pipe 15 and the modified cooling water pipe 16 will cool the battery module according to the preset flow rate.
[0049] Step S103: During the charge-discharge cycle of the battery module, the expansion force of the battery module is determined by an expansion force sensor located at the position of maximum cross-sectional force of the battery module.
[0050] Here, the expansion force sensor is a new device that replaces the battery cell and water-cooling plate at the original location of the battery module's maximum cross-sectional force.
[0051] In this embodiment of the application, the method for testing the expansion force of the battery module further includes: acquiring the expansion force of the battery module according to a standard period in each charge-discharge cycle. Here, as an example, the standard period is 30 seconds.
[0052] The standard period is determined in the following way: First, for each of the multiple test cycles, the difference between the maximum expansion force obtained in that test cycle and the maximum expansion force obtained in a preset cycle is determined as the expansion force difference corresponding to that test cycle. Here, the preset cycle is 1 second.
[0053] Then, at least one expansion force difference within a preset difference range is selected from the expansion force differences corresponding to all test cycles. Here, as an example, the preset difference range is the maximum expansion force obtained according to the preset cycle that is less than 5%.
[0054] Finally, the test cycle corresponding to the smallest expansion force difference among the screened expansion force differences is determined as the standard cycle.
[0055] This application provides a method for testing the expansion force of a battery module, which improves the reliability and accuracy of the expansion force data.
[0056] Based on the same application concept, this application also provides a battery module expansion force testing device corresponding to the battery module expansion force testing method provided in the above embodiments. Since the principle of the device in this application is similar to the battery module expansion force testing method in the above embodiments of this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.
[0057] like Figures 7 to 8 As shown, Figure 7 This is one of the structural schematic diagrams of a battery module expansion force testing device provided in an embodiment of this application. Figure 8 This is a second schematic diagram of a battery module expansion force testing device provided in an embodiment of this application.
[0058] like Figure 7 As shown in the figure, the battery module expansion force testing device 710 provided in this application embodiment includes a battery module including a plurality of battery cells and a plurality of water cooling plates for adjusting the temperature of the battery module, and cooling water pipes are fixed on the water cooling plates; The testing device 710 includes: The maximum cross-sectional force determination module 711 is used to determine the location of the maximum cross-sectional force of the battery module based on the constructed first simulation model for determining the cross-sectional force of the battery module; Test module 712 is used to control the liquid in the cooling water pipe to cool the battery module according to a preset flow rate, and at the same time to perform charge and discharge cycles on the battery module. The expansion force determination module 713 is used to determine the expansion force of the battery module by means of an expansion force sensor located at the position of the maximum cross-sectional force of the battery module during the charge and discharge cycle of the battery module; wherein, the expansion force sensor is a new device that replaces the battery cell and water cooling plate at the original position of the maximum cross-sectional force of the battery module.
[0059] Furthermore, the maximum cross-sectional force determination module 711 is specifically used for: Construct a first simulation model to determine the cross-sectional forces of the battery module; By performing charge-discharge cycles on the first simulation model, the forces at multiple cross sections of the battery module can be obtained. The maximum cross-sectional force is selected from multiple cross-sectional forces of the battery module to determine the location of the maximum cross-sectional force of the battery module.
[0060] like Figure 8 As shown, the testing apparatus 710 further includes: The acquisition module 714 is used to acquire the expansion force of the battery module according to a standard cycle in each charge-discharge cycle; The standard period is determined in the following way: For each of the multiple test cycles, the difference between the maximum expansion force obtained in that test cycle and the maximum expansion force obtained in the preset cycle is determined as the expansion force difference corresponding to that test cycle. Select at least one expansion force difference within a preset difference range from the expansion force differences corresponding to all test cycles; The test cycle corresponding to the smallest expansion force difference among the screened expansion force differences is determined as the standard cycle.
[0061] Furthermore, the testing device 710 also includes: The first construction module 715 is used to construct a second simulation model for determining the deformation of the first connection area between the battery module and the vehicle body structure; The first deformation determination module 716 is used to obtain the deformation of the first connection region by applying a preset force at the first connection region in the second simulation model. The second building module 717 is used to build a third simulation model for determining the deformation of the second connection area between the battery module and the battery fixture; The second deformation module 718 is used to obtain the deformation of the second connection area corresponding to the area test value by applying a preset force at the second connection area in the third simulation model for each of the multiple area test values of the cross-sectional area of the cross beam of the battery clamp, and by setting the cross-sectional area of the cross beam in the third simulation model to the area test value. The cross-sectional area determination module 719 determines the cross-sectional area value of the crossbeam of the battery clamp based on the deformation of the first connection region and the deformation of the second connection region corresponding to all area test values, so as to fix the battery module with the battery clamp prepared according to the cross-sectional area value of the crossbeam.
[0062] Furthermore, when determining the cross-sectional area value of the battery clamp beam based on the deformation of the first connecting region and the deformation of the second connecting region corresponding to all area test values, the cross-sectional area determination module 719 is also specifically used for: The difference between the deformation of the second connected region corresponding to the area test value and the deformation of the first connected region is determined as the deviation corresponding to the area test value; The smallest deviation is selected from all the deviations corresponding to the area test values, and the area test value corresponding to the selected deviation is determined as the cross-sectional area value of the beam of the battery clamp.
[0063] This application provides a battery module expansion force testing device, which improves the reliability and accuracy of expansion force data.
[0064] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.
[0065] like Figure 9 As shown, the electronic device 900 includes a processor 910, a memory 920, and a bus 930.
[0066] The memory 920 stores machine-readable instructions executable by the processor 910. When the electronic device 900 is running, the processor 910 and the memory 920 communicate via the bus 930. When the machine-readable instructions are executed by the processor 910, they can perform the operations described above. Figure 1 , Figure 3 and Figure 4 The steps of the battery module expansion force test method in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.
[0067] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions.Figure 1 , Figure 3 and Figure 4 The steps of the battery module expansion force test method in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.
[0068] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.
[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0070] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0071] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0072] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A method for testing the expansion force of a battery module, characterized in that, The battery module includes multiple battery cells and multiple water-cooling plates for regulating the temperature of the battery module, and cooling water pipes are fixed on the water-cooling plates. The testing method includes: Based on the first simulation model constructed to determine the cross-sectional force of the battery module, the location of the maximum cross-sectional force of the battery module is determined; The liquid in the cooling water pipe is controlled to cool the battery module according to a preset flow rate, while the battery module is charged and discharged in a cycle. During the charge-discharge cycle of the battery module, the expansion force of the battery module is determined by an expansion force sensor located at the position of maximum cross-sectional force of the battery module; wherein, the expansion force sensor is a new device that replaces the battery cell and water cooling plate at the original position of maximum cross-sectional force of the battery module.
2. The method for testing the expansion force of a battery module according to claim 1, characterized in that, The determination of the location of the maximum cross-sectional force of the battery module, based on the constructed first simulation model for determining the cross-sectional force of the battery module, includes: Construct a first simulation model to determine the cross-sectional forces of the battery module; By performing charge-discharge cycles on the first simulation model, the forces at multiple cross sections of the battery module can be obtained. The maximum cross-sectional force is selected from multiple cross-sectional forces of the battery module to determine the location of the maximum cross-sectional force of the battery module.
3. The method for testing the expansion force of a battery module according to claim 1, characterized in that, The testing method also includes: The expansion force of the battery module is obtained according to the standard cycle in each charge-discharge cycle; The standard period is determined in the following way: For each of the multiple test cycles, the difference between the maximum expansion force obtained in that test cycle and the maximum expansion force obtained in the preset cycle is determined as the expansion force difference corresponding to that test cycle. Select at least one expansion force difference within a preset difference range from the expansion force differences corresponding to all test cycles; The test cycle corresponding to the smallest expansion force difference among the screened expansion force differences is determined as the standard cycle.
4. The method for testing the expansion force of a battery module according to claim 1, characterized in that, The testing method also includes: A second simulation model is constructed to determine the deformation of the first connection area between the battery module and the vehicle body structure; By applying a preset force to the first connection region in the second simulation model, the deformation of the first connection region is obtained; A third simulation model is constructed to determine the deformation of the second connection area between the battery module and the battery clamp; For each of the multiple area test values of the cross-sectional area of the battery clamp beam, a preset force is applied at the second connection area in the third simulation model, and the cross-sectional area of the beam in the third simulation model is set to the area test value to obtain the deformation of the second connection area corresponding to the area test value. Based on the deformation of the first connection region and the deformation of the second connection region corresponding to all area test values, the cross-sectional area value of the beam of the battery clamp is determined so as to fix the battery module with the battery clamp prepared according to the cross-sectional area value of the beam.
5. The method for testing the expansion force of a battery cell according to claim 4, characterized in that, The determination of the cross-sectional area value of the battery clamp beam based on the deformation of the first connection region and the deformation of the second connection region corresponding to all area test values includes: The difference between the deformation of the second connected region corresponding to the area test value and the deformation of the first connected region is determined as the deviation corresponding to the area test value; The smallest deviation is selected from all the deviations corresponding to the area test values, and the area test value corresponding to the selected deviation is determined as the cross-sectional area value of the beam of the battery clamp.
6. A device for testing the expansion force of a battery cell, characterized in that, The battery module includes multiple battery cells and multiple water-cooling plates for regulating the temperature of the battery module, and cooling water pipes are fixed on the water-cooling plates. The testing apparatus includes: The maximum cross-sectional force determination module is used to determine the location of the maximum cross-sectional force of the battery module based on the constructed first simulation model for determining the cross-sectional force of the battery module; The test module is used to control the liquid in the cooling water pipe to cool the battery module according to a preset flow rate, and at the same time perform charge and discharge cycles on the battery module. An expansion force determination module is used to determine the expansion force of the battery module during the charge-discharge cycle by using an expansion force sensor located at the position of maximum cross-sectional force of the battery module; wherein, the expansion force sensor is a new device that replaces the battery cell and water-cooling plate at the original position of maximum cross-sectional force of the battery module.
7. The battery module expansion force testing device according to claim 6, characterized in that, The maximum cross-sectional force determination module is specifically used for: Construct a first simulation model to determine the cross-sectional forces of the battery module; By performing charge-discharge cycles on the first simulation model, the forces at multiple cross sections of the battery module can be obtained. The maximum cross-sectional force is selected from multiple cross-sectional forces of the battery module to determine the location of the maximum cross-sectional force of the battery module.
8. The battery module expansion force testing device according to claim 6, characterized in that, The testing apparatus also includes: The acquisition module is used to acquire the expansion force of the battery module according to a standard cycle in each charge-discharge cycle; The standard period is determined in the following way: For each of the multiple test cycles, the difference between the maximum expansion force obtained in that test cycle and the maximum expansion force obtained in the preset cycle is determined as the expansion force difference corresponding to that test cycle. Select at least one expansion force difference within a preset difference range from the expansion force differences corresponding to all test cycles; The test cycle corresponding to the smallest expansion force difference among the screened expansion force differences is determined as the standard cycle.
9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the battery cell expansion force test method as described in any one of claims 1 to 5.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the battery cell expansion force test method as described in any one of claims 1 to 5.