A test tool for simulating cell and battery module expansion

Abstract

The application relates to a test simulation cell and a tool for simulating the expansion amount of a battery module. The tool for simulating the expansion amount of the battery module comprises at least two test simulation cells, cell fixing devices for fixing the test simulation cells into groups, and a gas supply pipeline. The test simulation cell comprises a simulation shell, a simulation top cover and a simulation core body. The simulation top cover is fixed and sealed at the opening of the simulation shell and is provided with a gas inlet hole. The simulation core body is fixed in the simulation shell and leaves a gas charging gap between the simulation core body and the side wall of the simulation shell. The gas charging gap is communicated with the gas supply pipeline through the gas inlet hole. The tool has simple structure and low cost. High-pressure gas can be filled into each test simulation cell through the gas supply pipeline to simulate the actual expansion of the cells after the cells are grouped at the end of the service life. The tool structure in combination with the gas filling mode of the test simulation cell can quickly evaluate the expansion amount of the whole grouped cells, shorten the test time and reduce the labor intensity of the test personnel.

Description

Technical Field

[0001] This invention relates to the field of battery testing equipment technology, specifically to a tooling for testing simulated battery cells and simulating the expansion of battery modules. Background Technology

[0002] To improve battery efficiency, heating films and liquid cooling plates are typically attached to the sides of battery modules. When the ambient temperature is low, the heating film raises the cell temperature; when the battery module temperature is high, the liquid cooling plate lowers the cell temperature. However, during actual use, as battery capacity decreases, gas is generated inside the cell, causing the cell sides to expand. Increased expansion can cause the heating film on the battery module sides to detach, and adjacent battery modules may press against each other, leading to the failure of the side liquid cooling plates and potentially causing battery safety issues.

[0003] To ensure the safe and stable operation of the battery, it is necessary to arrange the heating film on the side of the battery module and design the dimensions of the battery module and liquid cooling plate according to the maximum expansion of the cell side. In the existing technology, the maximum expansion of the cell side after capacity decay is obtained by cyclic testing of individual cells. This testing method is costly, time-consuming, and cannot assess the expansion of the battery module side after assembly. Summary of the Invention

[0004] The purpose of this invention is to provide a test-type simulated battery cell to solve the technical problems of high cost and long cycle in the prior art for testing the maximum side expansion of a battery cell; correspondingly, the purpose of this invention is also to provide a tooling for simulating the expansion of a battery module to solve the technical problems of high cost and long cycle in the prior art for measuring the maximum side expansion of a battery cell, and the inability to evaluate the side expansion of the assembled battery module.

[0005] The experimental simulated battery cell of this invention adopts the following technical solution: The test simulated battery cell includes a simulated housing, a simulated top cover, and a simulated core. The simulated top cover is sealed and fixed at the opening of the simulated housing and has an air inlet. The simulated core is fixed on the simulated housing or the simulated top cover, with an inflation gap between it and the side wall of the simulated housing. The inflation gap is connected to the air inlet.

[0006] The beneficial effects of this invention are as follows: By using a simulated battery cell to replace the actual battery cell in the test, the simulated core inside the simulated battery cell can be reused, resulting in low cost and ease of processing and manufacturing. Moreover, the air inlet on the simulated top cover facilitates connection with an external air source. By filling the simulated battery cell with high-pressure gas at the end of its battery life, the actual expansion of the battery cell at the end of its battery life can be simulated, making it convenient for test personnel to measure the actual expansion amount of the battery cell at the end of its battery life. This simulated battery cell structure, combined with the method of filling the simulated battery cell with gas, can quickly assess the lateral expansion of the battery cell, shorten the test time, and reduce the labor intensity of test personnel.

[0007] Furthermore, the simulated core is a concrete block.

[0008] Its beneficial effects are: concrete is low in cost and readily available, and during the process of inflating the simulated battery cell for testing, the volume of the simulated core of the concrete block structure will not change due to the compression of the high-pressure air inside the simulated shell and the compression of the assembly tooling during the battery cell assembly process.

[0009] Furthermore, the experimental simulated battery cell also includes a baffle located inside the simulated housing, with an inflation gap between the baffle and the side wall of the simulated housing. The concrete block is formed by casting within the space enclosed by the baffle.

[0010] Its beneficial effects are: the above-mentioned structural design facilitates the pouring of concrete into the simulated battery cell for testing, and ensures the air gap between the side wall of the simulated shell and the baffle.

[0011] Furthermore, the baffle is bonded and fixed to the bottom wall or top cover of the simulated shell.

[0012] Its beneficial effects are: the above-mentioned structural design can prevent the position of the baffle from moving and affecting the air gap between it and the side wall of the simulated battery cell during the process of pouring concrete into the test cell, and the use of adhesive connection makes it easy for test personnel to operate.

[0013] Furthermore, the simulated core is bonded and fixed to the bottom wall of the simulated shell or the top cover of the simulated shell.

[0014] Its beneficial effect is that the above-mentioned simulated core adopts an adhesive connection method, which is convenient for test personnel to operate.

[0015] Furthermore, the experimental simulated battery cell also includes an inflation connector, which is fixed at the air inlet position.

[0016] Its beneficial effect is that an inflation connector is set in the test simulation cell, which facilitates the connection between the test simulation cell and the external gas supply pipeline.

[0017] Furthermore, the air inlet is a threaded hole, and the inflation connector is threadedly connected to the air inlet.

[0018] Its advantages are: the threaded connection structure is simple and easy for testers to operate.

[0019] Furthermore, the experimental simulated battery cell also includes a back tightening nut, which is located on the underside of the simulated top cover and connected to the inflation connector.

[0020] Its beneficial effects are: the above-mentioned structural design can increase the length of the threaded section connected to the inflation connector, and increase the connection strength and airtightness between the inflation connector and the simulated top cover.

[0021] The tooling for simulating the expansion of a battery module in this invention adopts the following technical solution: the tooling for simulating the expansion of a battery module includes a simulated battery module and an air supply pipeline; the simulated battery module includes at least two test simulated cells, each test simulated cell including a simulated shell, a simulated top cover, and a simulated core, the simulated top cover being sealed and fixed at the opening of the simulated shell and having an air inlet, the simulated core being fixed on the simulated shell or the simulated top cover, with an inflation gap between it and the side wall of the simulated shell, the inflation gap communicating with the air inlet; the simulated battery module also includes a cell fixing device, which fixes the at least two test simulated cells into a group; the air supply pipeline is communicating with the air inlet.

[0022] The beneficial effects of this invention are: the tooling structure for simulating the expansion of battery modules is simple and low in cost. High-pressure gas at the end-of-life pressure of the battery cell can be supplied to each simulated battery cell through the gas supply pipeline to simulate the actual expansion of the battery cells after assembly at the end of their lifespan, which facilitates the design and layout of the heating film and the liquid cooling plate. Moreover, the tooling structure for simulating the expansion of battery modules combined with the method of supplying gas to the simulated battery modules can realistically simulate the expansion of the battery modules at the end of their lifespan, quickly assess the lateral expansion of the entire battery module, shorten the test time, and reduce the labor intensity of the test personnel.

[0023] Furthermore, the simulated core is a concrete block.

[0024] Its beneficial effects are: concrete is low in cost and readily available, and during the process of inflating the simulated battery cell for testing, the volume of the simulated core of the concrete block structure will not change due to the compression of the high-pressure air inside the simulated shell and the compression of the assembly tooling during the battery cell assembly process.

[0025] Furthermore, the experimental simulated battery cell also includes a baffle located inside the simulated housing, with an inflation gap between the baffle and the side wall of the simulated housing. The concrete block is formed by casting within the space enclosed by the baffle.

[0026] Its beneficial effects are: the above-mentioned structural design facilitates the pouring of concrete into the simulated battery cell for testing, and ensures the air gap between the side wall of the simulated shell and the baffle.

[0027] Furthermore, the baffle is bonded and fixed to the bottom wall or top cover of the simulated shell.

[0028] Its beneficial effects are: the above-mentioned structural design can prevent the position of the baffle from moving and affecting the air gap between it and the side wall of the simulated battery cell during the process of pouring concrete into the test cell, and the use of adhesive connection makes it easy for test personnel to operate.

[0029] Furthermore, the simulated core is bonded and fixed to the bottom wall of the simulated shell or the top cover of the simulated shell.

[0030] Its beneficial effect is that the above-mentioned simulated core adopts an adhesive connection method, which is convenient for test personnel to operate.

[0031] Furthermore, the experimental simulated battery cell also includes an inflation connector, which is fixed at the air inlet position.

[0032] Its beneficial effect is that an inflation connector is set in the test simulation cell, which facilitates the connection between the test simulation cell and the external gas supply pipeline.

[0033] Furthermore, the air inlet is a threaded hole, and the inflation connector is threadedly connected to the air inlet.

[0034] Its advantages are: the threaded connection structure is simple and easy for testers to operate.

[0035] Furthermore, the experimental simulated battery cell also includes a back tightening nut, which is located on the underside of the simulated top cover and connected to the inflation connector.

[0036] Its beneficial effects are: the above-mentioned structural design can increase the length of the threaded section connected to the inflation connector, and increase the connection strength and airtightness between the inflation connector and the simulated top cover.

[0037] Furthermore, the air supply line is connected to the air inlet via a T-joint.

[0038] Its beneficial effect is that the above-mentioned three-way connector structure makes it convenient for multiple test-use simulated cells to share the same gas supply pipeline. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the tooling for simulating the expansion of a battery module in specific embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the internal structure of the simulated battery cell used in the test in a specific embodiment 1 of the tooling for simulating the expansion of a battery module according to the present invention; Figure 3 This is an exploded structural diagram of the connection between the simulated top cover and the gas supply pipeline in a specific embodiment 1 of the tooling for simulating the expansion of the battery module of the present invention. Figure 4 This is an exploded structural diagram of the connection between the simulated top cover and the inflation connector in a specific embodiment 2 of the tooling for simulating the expansion of the battery module of the present invention. Figure 5 This is an exploded structural diagram of the connection between the simulated top cover and the inflation connector in a specific embodiment 3 of the tooling for simulating the expansion of the battery module of the present invention. In the diagram: 1. Simulated battery module; 11. Simulated casing; 12. Simulated top cover; 121. Air inlet; 13. Concrete block; 14. Baffle; 15. Inflation gap; 16. Inflation connector; 17. Back tightening nut; 18. Rivet nut; 2. Air supply pipeline; 3. T-connector; 4. End plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0045] The present invention will be further described in detail below with reference to the embodiments.

[0046] Specific embodiment 1 of the tooling for simulating the expansion of a battery module provided by this invention: like Figure 1 As shown, the tooling for simulating the expansion of a battery module includes a simulated battery module 1 and a gas supply pipe 2. The simulated battery module 1 has a space for containing gas. The gas supply pipe 2 is connected to the simulated battery module 1 and communicates with the space for containing gas. Gas can be supplied to the simulated battery module 1 through the gas supply pipe 2 to simulate the actual expansion of the battery module at the end of the cell's life. This allows for the measurement of the actual expansion of the battery module at the end of the cell's life, providing a basis for the subsequent design and layout of the side heating film of the battery module and the design of the liquid cooling plate.

[0047] Specifically, in this embodiment, the simulated battery module 1 includes a test simulated battery cell, such as... Figure 2As shown, the simulated battery cell for testing includes a simulated housing 11 for simulating the battery cell casing, a simulated top cover 12 for simulating the battery cell top cover, and a simulated core. The simulated housing 11 is an aluminum shell, which is fixed to the simulated top cover 12 by laser welding. AB glue is used at the weld seam to ensure the airtightness of the simulated battery cell. A blue film is pasted on the surface of the aluminum shell to better simulate the actual battery cell. Four baffles 14 are installed inside the simulated housing 11 and are bonded to the bottom wall of the simulated housing 11. These four baffles 14 are spaced apart from the four side walls of the simulated housing 11 to reserve an inflation gap 15 between the baffles 14 and the simulated housing 11. This inflation gap 15 serves as the space for accommodating gas in the simulated battery module 1. The simulated core is located in the middle of the four baffles 14. In this embodiment, the four baffles 14 form a hollow structure, and the simulated core is a concrete block 13. The baffles 14 are made of high-strength plastic parts to ensure that they will not deform under high-pressure gas. In other embodiments, the baffle 14 can also be made of high-strength steel plate. In this embodiment, after the baffle 14 is bonded to the simulated shell 11, concrete is poured between the four baffles 14 to form a concrete block 13, and the concrete block 13 is bonded and fixed to the bottom wall of the simulated shell 11 to ensure that the volume of the structure formed by the concrete and the four baffles 14 after solidification is equal to the volume of the winding structure in the actual battery cell.

[0048] In other embodiments, four baffles are bonded end to end to the outside of the simulated shell, and concrete is poured into the space enclosed by the four baffles to form a concrete block. After the concrete block is bonded to the baffles, the bottom wall of the concrete block is bonded and fixed to the bottom wall of the simulated shell.

[0049] In this embodiment, as Figure 2 As shown, the height of the concrete block 13 and the height of the baffle 14 are both less than the height of the simulated shell 11, so as to reserve an inflation gap 15 between the concrete block 13 and the simulated top cover 12, and to ensure that the inflation gap 15 at the top of the simulated cell for the test is connected to the inflation gaps 15 on the four sides.

[0050] In this embodiment, as Figure 3 As shown, an air inlet 121 is provided on the simulated top cover 12. The air inlet 121 is a threaded hole and is connected to the gas filling gap 15 in the simulated battery cell. The simulated battery cell also includes a gas filling connector 16. The gas filling connector 16 is threadedly connected to the air inlet 121 and is connected to the gas supply line 2 so that gas can be filled into the gas filling gap 15 of the battery cell through the gas supply line 2.

[0051] In this embodiment, as Figure 1As shown, the simulated battery module 1 contains twenty-one test simulated cells. The simulated battery module 1 also includes a cell fixing device that presses and fixes the twenty-one test simulated cells into a group. In this embodiment, the cell fixing device includes straps and end plates 4. Adjacent test simulated cells are fixed together using structural adhesive. Two end plates 4 are provided and located at both ends of the test simulated cell arrangement direction. The straps bind the end plates 4 to the grouped test simulated cells, preventing adjacent test simulated cells from separating in the test simulated cell arrangement direction under high-pressure gas.

[0052] In other embodiments, the cell fixing device may not include straps, and the test simulated cell and end plate 4 are fixed only by structural adhesive. In general, the way the test simulated cells are fixed in groups is the same as the way cells are fixed in groups in an actual battery module; that is, the structure of the cell fixing device is the same as the structure for fixing cells in groups in an actual battery module.

[0053] In this embodiment, twenty-one simulated battery cells are used for the test. In other embodiments, the number of simulated battery cells used for the test is the same as the number of battery cells in the battery module to be measured, and can be two, three, or four or more.

[0054] In this embodiment, as Figure 1 and Figure 3 As shown, a three-way connector 3 is provided on the gas supply line 2. There are twenty three-way connectors 3. One of the gas outlets of the three-way connector 3 is connected to the air inlet 121 of the adjacent twenty test simulated battery cells to ensure that the gas filling gap 15 in each test simulated battery cell is connected and to ensure that the gas pressure filled into each test simulated battery cell through the gas supply line 2 is equal.

[0055] In this embodiment, during the measurement of the battery module expansion, high-pressure gas equal to the pressure at the end of the cell's life is injected into each test simulated cell through the gas supply pipeline 2, causing the sides of each test simulated cell to expand. By measuring the expansion of the entire simulated battery module 1, the actual battery module expansion test is completed. Compared with the existing method of cyclic testing of a single cell, the gas injection test process of the tooling for simulating the expansion of the battery module in this embodiment is simple, easy to operate, low in cost, and short in time. Moreover, the tooling for simulating the expansion of the battery module in this embodiment can better simulate the side expansion of each cell after assembly, and the results obtained after the test are more realistic.

[0056] Based on the expansion amount of the battery cell side measured by the tooling that simulates the expansion amount of the battery module in this embodiment, battery designers can design and arrange the heating film on the side of the battery module to ensure that the heating film will not delaminate or partially dry-burn due to the expansion of the battery cell side. The measured expansion amount of the battery side can also provide design margin for the overall size design of the module and the design of the liquid cooling plate on the side of the battery pack, avoid squeezing of adjacent modules and damage to the blue film, avoid the liquid cooling plate from leakage failure due to squeezing of the battery cell side, and ensure normal operation of the battery.

[0057] Specific embodiment 2 of the tooling for simulating the expansion of a battery module provided by this invention: The difference from specific embodiment 1 is that the air inlet 121 on the simulated top cover 12 is a through-hole structure, such as... Figure 4 As shown, the simulated battery cell used in the test also includes a back tightening nut 17, which is located at the lower part of the simulated top cover 12. After the inflation connector 16 is inserted into the air inlet 121, it is tightened with the back tightening nut 17 to achieve a sealed connection between the air inlet 121 and the inflation connector 16.

[0058] In other embodiments, when the air inlet is a threaded hole, the portion of the inflation connector that extends through the threaded hole is fastened to the back tightening nut.

[0059] Specific embodiment 3 of the tooling for simulating the expansion of a battery module provided by this invention: The difference from specific embodiment 1 is that the air inlet 121 on the simulated top cover 12 is a through-hole structure, such as... Figure 5 As shown, the simulated top cover 12 is equipped with a rivet nut 18, which is riveted to the air inlet 121. The air inlet connector 16 is directly and sealed to the rivet nut 18.

[0060] Specific embodiment 4 of the tooling for simulating the expansion of a battery module provided by this invention: The difference from Specific Embodiment 1 is that the simulated core in the simulated casing is a plastic component with good strength. During the testing of the battery module's expansion, this plastic component will not deform under the action of high-pressure gas in the simulated casing. Alternatively, in other embodiments, the simulated core can also be a rigid component. In general, the simulated core can also be other structures, as long as it ensures that the simulated core will not deform under the action of high-pressure gas in the simulated casing.

[0061] Specific embodiment 5 of the tooling for simulating the expansion of a battery module provided by this invention: The difference from Specific Embodiment 1 is that the concrete is a pre-cast block structure, and the size of the space enclosed by the concrete block and the baffle is equal, ensuring that the concrete block can be placed in the space enclosed by the baffle during the fabrication of each test simulated cell, and the concrete block is bonded and fixed to the bottom of the simulated shell.

[0062] Specific embodiment 6 of the tooling for simulating the expansion of a battery module provided by the present invention: The difference from Specific Embodiment 1 is that: no baffle is set in the experimental simulated battery cell, and the concrete is a pre-cast block structure. During the production of the experimental simulated battery cell, the concrete block is fixed to the bottom wall of the simulated shell by adhesive bonding. The inflation gap is set between the concrete block and the simulated shell, and inflation gaps are set on the upper side and around the concrete block to ensure that the air inlet on the simulated top cover is connected to the inflation gap on the side of the concrete block.

[0063] Specific embodiment 7 of the tooling for simulating the expansion of a battery module provided by the present invention: The difference from Specific Embodiment 1 is that the baffle is fixed to the bottom wall of the simulated shell by screws.

[0064] In other embodiments, both the baffle and the concrete block can be fixed to the simulated top cover. The specific fixing method can be adhesive or screw connection, or it can be fixed by a slot. In the structure fixed by the above method, slots need to be made in the baffle and the concrete block to ensure that the air inlet on the simulated top cover is connected to the air gap on the inner side of the simulated shell.

[0065] The tooling for simulating the expansion of a battery module in this invention measures the expansion of the side of the simulated cell after assembly. This expansion is the expansion of the side of the simulated cell that is parallel to the cell assembly direction. Therefore, in other embodiments, the baffle and concrete block can also be fixed on the side of the cell housing that is perpendicular to the cell assembly direction, i.e., on the side of the cell housing that is parallel to the end plate. An inflation gap is reserved only between the side of the cell housing that is perpendicular to the end plate and the simulated core. The baffle and concrete block can be fixed to the side of the cell housing by one of adhesive fixing, slot fixing, or screw fixing.

[0066] Specific embodiment 8 of the tooling for simulating the expansion of a battery module provided by this invention: The difference from Specific Embodiment 1 is that: no air inlet is provided in the test simulated battery cell, only an air inlet is provided on the simulated top cover, the air inlet is provided in the air supply pipeline, and is located at the air outlet position of each tee joint connected to the corresponding test simulated battery cell, and the air inlet is sealed and inserted into the air inlet.

[0067] Specific embodiments of the experimental simulated battery cell provided by the present invention: The structure of the test simulated battery cell provided by this invention is the same as the structure of the test simulated battery cell in the tooling for simulating the expansion of the battery module provided by this invention, and will not be described again here.

[0068] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test-grade simulated battery cell, characterized in that, The device includes a simulated housing (11), a simulated top cover (12), and a simulated core. The simulated top cover (12) is sealed and fixed at the opening of the simulated housing (11), and an air inlet (121) is provided on the simulated top cover (12). The simulated core is fixed to the simulated housing (11) or the simulated top cover (12), and an inflation gap (15) is left between it and the side wall of the simulated housing (11). The inflation gap (15) is connected to the air inlet (121). The inflation gap (15) is configured to be used to fill in working gas so that the gas pressure acts directly on the inner wall of the simulated housing (11). The simulated core is a rigid component, and its volume remains unchanged during inflation. The test simulated battery cell is used to simulate the expansion of the battery cell by measuring the deformation displacement of the simulated housing (11).

2. The experimental simulated battery cell according to claim 1, characterized in that, The simulated core is a concrete block (13).

3. The experimental simulated battery cell according to claim 2, characterized in that, The test simulated cell also includes a baffle (14), which is located inside the simulated shell (11) and has an air gap (15) between it and the side wall of the simulated shell (11). The concrete block (13) is formed by casting within the space enclosed by the baffle (14).

4. The experimental simulated battery cell according to claim 3, characterized in that, The baffle (14) is bonded and fixed to the bottom wall of the simulated shell (11) or the simulated top cover (12).

5. The experimental simulated battery cell according to any one of claims 1 to 4, characterized in that, The simulated core is bonded and fixed to the bottom wall of the simulated shell (11) or the simulated top cover (12).

6. The experimental simulated battery cell according to any one of claims 1 to 4, characterized in that, The test simulated battery cell also includes an inflation connector (16), which is fixed at the position of the air inlet (121).

7. The experimental simulated battery cell according to claim 6, characterized in that, The air inlet (121) is a threaded hole, and the air inlet connector (16) is threadedly connected to the air inlet (121).

8. The experimental simulated battery cell according to claim 6, characterized in that, The test simulated cell also includes a back tightening nut (17), which is located on the underside of the simulated top cover (12) and connected to the inflation connector (16).

9. A tooling for simulating the expansion of a battery module, characterized in that, It includes a simulated battery module (1) and an air supply line (2); the simulated battery module (1) includes at least two test simulated cells, the test simulated cells being the test simulated cells according to any one of claims 1 to 8, the simulated battery module (1) also includes a cell fixing device, the cell fixing device fixing the at least two test simulated cells into a group; the air supply line (2) is connected to the air inlet (121).

10. The tooling for simulating the expansion of a battery module according to claim 9, characterized in that, The gas supply line (2) is connected to the air inlet (121) through a three-way connector (3).

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