Cell testing box and cell testing system

Abstract

This utility model belongs to the field of battery testing technology, and discloses a cell testing box and a cell testing system. A first baffle and a second baffle, together with the bottom wall, cover plate, side plate, and first side wall of the box, form a sealed, cuboid-shaped testing chamber. The position of the first baffle can be adjusted along the X-direction and the position of the second baffle along the Y-direction to adjust the volume of the testing chamber according to the different sizes of cells. This meets the volume requirements of different sized cells, ensuring that the bottom area of ​​the testing chamber minus the bottom area of ​​the cell under test remains constant. This ensures that when the same volume of coolant is injected into the testing chamber, the liquid level is the same, facilitating horizontal comparison of test results for different types of cells. By adjusting the position of the first baffle along the X-direction and the position of the second baffle along the Y-direction, the cell under test is placed in an environment closer to real-world conditions. Furthermore, by ensuring the sealing performance of the cell testing box, the accuracy of the test results is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a cell testing box and a cell testing system. Background Technology

[0002] The safety performance of power batteries directly affects the overall performance of the product. Power batteries may experience thermal runaway during use, which can even lead to explosions. Therefore, thermal runaway is an important indicator for evaluating the safety performance of power batteries. In order to improve the safety performance of power batteries, it is necessary to conduct thermal runaway tests on the battery cells.

[0003] Currently, the specific method for thermal runaway testing of power battery cells is as follows: The cell under test is placed inside the test chamber, and coolant enters the test chamber from the inlet on the test chamber. The cell under test is immersed in the coolant, and the coolant carries away the heat generated by the cell's operation and is discharged from the outlet of the test chamber. Then, heating elements are used to heat the coolant, and methods such as needle penetration are used as triggering mechanisms to simulate different thermal runaway conditions to induce thermal runaway of the cell.

[0004] Current power battery thermal runaway testing equipment can only be used for cells of a single size, which cannot meet the testing needs of cells of different sizes; moreover, it is not convenient to make horizontal comparisons of test results of cells of different models. Utility Model Content

[0005] The purpose of this invention is to provide a battery cell testing box and a battery cell testing system that can meet the testing requirements of battery cells of different sizes, thereby improving the accuracy of test results and enabling a horizontal comparison of the testing structures of different battery cell models.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Cell testing box, including:

[0008] The enclosure includes a main body and a first baffle and a second baffle disposed within the main body. The main body includes a bottom wall, a side panel, and a first side wall. The first baffle and the side panel are spaced apart and opposite to each other along the X direction, and the position of the first baffle relative to the side panel along the X direction is adjustable. The second baffle and the first side wall are opposite to each other and spaced apart along the Y direction, and the position of the second baffle relative to the first side wall along the Y direction is adjustable.

[0009] A cover plate and a bottom wall are arranged opposite each other and spaced apart along the Z direction, and the X direction, the Y direction and the Z direction are perpendicular to each other; the first baffle and the second baffle are configured to form a sealed test chamber with the bottom wall, the cover plate, the box side plate and the first box side wall.

[0010] As one possible implementation of the above-mentioned cell testing box, there are multiple first baffles, each of which has a different length along the Y direction. The multiple first baffles can be selected to form the testing cavity with the bottom wall, the box side plate, the first box side wall, the second baffle, and the cover plate.

[0011] As one possible implementation of the above-mentioned cell testing box, the upper surface of the bottom wall is provided with a plurality of first grooves spaced apart along the X direction, and one of the plurality of first baffles can be selectively and sealingly inserted into any of the first grooves along the Z direction; or, the cell testing box further includes a first driving member, and one of the plurality of first baffles can be detachably connected to the output end of the first driving member, and the first driving member is used to drive the first baffle connected thereto to move along the X direction.

[0012] As one possible implementation of the above-mentioned cell testing box, the first baffle is provided with a first needle hole that extends through the X direction;

[0013] The positions of the first needle holes on different first baffles along the Y direction are different; and / or, the positions of the first needle holes on at least two first baffles along the Z direction are different.

[0014] As one possible implementation of the above-mentioned cell testing box, the box body further includes a second box side wall, and the second baffle is located between the box side plate and the second box side wall along the X direction; one end of the second baffle is sealed and pressed against the box side plate along the X direction, and the other end is pressed against the second box side wall along the X direction; the second baffle is sealed and sandwiched between the bottom wall and the cover plate along the Z direction;

[0015] And / or, the selected first baffle is sealed between the second baffle and the first box sidewall along the Y direction, and sealed between the bottom wall and the cover plate along the Z direction.

[0016] As one possible implementation of the above-mentioned cell testing box, the first baffle is provided with a first needle hole that runs through the X direction, and the box body also includes a second box side wall;

[0017] The second box sidewall is provided with at least one second needle hole that runs through the X direction. The projection of the first needle hole in a preset plane perpendicular to the X direction is the first projection, and the projection of the second needle hole in the preset plane is the second projection.

[0018] The first needle hole on any of the selected first baffles can be matched with a second needle hole, and the first projection of the first needle hole on any of the selected first baffles is completely located within the second projection of the matched second needle hole.

[0019] As one possible implementation of the above-mentioned cell testing box, the upper surface of the bottom wall is provided with a plurality of second grooves arranged at intervals along the Y direction, and one end of the second baffle is sealed and inserted into any of the second grooves along the Z direction;

[0020] Alternatively, the second baffle is connected to a second driving member for driving the second baffle to move along the Y direction.

[0021] As one possible implementation of the above-mentioned cell testing box, the cell testing box further includes two clamping units, which are at least partially located inside the testing cavity;

[0022] The two clamping units are arranged at intervals along a preset direction, and the position of the clamping units along the preset direction is adjustable so that the battery cell is clamped between the two clamping units along the preset direction, which is any one of the X direction, Y direction and Z direction.

[0023] As one possible implementation of the above-mentioned cell testing box, at least one of the box side panel, the first box side wall and the second baffle is a transparent explosion-proof glass plate, or, at least one of the box side panel, the first box side wall and the second baffle forming the test cavity, has an installation window in the part forming the test cavity, and the installation window is fitted with transparent explosion-proof glass;

[0024] And / or, the cell test chamber further includes a liquid level measuring device for measuring the liquid level in the test chamber.

[0025] As one possible implementation of the above-mentioned cell testing box, the cover plate is movably connected to the box body along the Z direction, so that the cover plate can selectively seal the box body, or be spaced apart from the box body along the Z direction to form an exhaust channel;

[0026] And / or, the cover plate is provided in multiple ways, the multiple cover plates are made of different materials and / or have different thicknesses, and one of the multiple cover plates is detachably connected to the box body.

[0027] To achieve the above objectives, this utility model also provides a battery cell testing system, including the battery cell testing box provided in any of the above-described feasible embodiments.

[0028] The beneficial effects of this utility model are as follows: The battery cell testing box provided by this utility model has a first baffle and a second baffle configured to form a sealed, rectangular test chamber with the bottom wall, cover plate, side plate, and first side wall of the box. The position of the first baffle can be adjusted along the X direction and the position of the second baffle can be adjusted along the Y direction according to the battery cell of different sizes, so as to adjust the volume of the test chamber and meet the volume requirements of the test chamber for battery cells of different sizes. The bottom area of ​​the test chamber minus the bottom area of ​​the battery cell under test remains unchanged, thereby achieving the same volume of coolant injected into the test chamber and the same liquid level in the test chamber, which facilitates the horizontal comparison of test results of different types of battery cells. This cell testing chamber allows for adjustment of both the position of the first baffle in the X-direction and the position of the second baffle in the Y-direction. This ensures that, after the cell to be tested is placed inside the testing chamber, the distance between the cell and the side panel and the first baffle in the X-direction closely approximates the actual situation of the cell within the battery housing, and the distance between the cell and the first side wall and the second baffle in the Y-direction closely approximates the actual situation of the cell within the battery housing. Furthermore, by ensuring the sealing performance of the cell testing chamber, the accuracy of the test results is improved.

[0029] The battery cell testing system provided by this utility model includes the aforementioned battery cell testing chamber. It can adjust the volume of the testing chamber according to different battery cells under test, ensuring that the bottom area of ​​the testing chamber minus the bottom area of ​​the battery cell under test remains constant. This allows for the injection of the same volume of coolant into the testing chamber, maintaining the same liquid level within the chamber. This facilitates horizontal comparison of test results for different types of battery cells, thereby improving the accuracy of the test results. Furthermore, by placing the battery cell under test in a more realistic environment and ensuring the sealing performance of the battery cell testing chamber, the accuracy of the test results is further improved. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the battery cell testing box provided in this embodiment of the utility model;

[0031] Figure 2 yes Figure 1 The top view of the battery cell testing box shown;

[0032] Figure 3 This is a schematic diagram of the structure of one of the first baffles provided in one embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the first tank sidewall with a liquid level measuring element provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this utility model.

[0035] In the picture:

[0036] 1. Box body; 11. Bottom wall; 111. First groove; 112. Second groove; 113. Third groove; 12. Third box side wall; 13. Box side panel; 131. Side panel body; 132. Mounting plate; 14. First box side wall; 15. First baffle; 151. First through hole; 152. First needle hole; 16. Second baffle; 17. Second box side wall;

[0037] 2. Cover plate;

[0038] 3. Clamping unit; 31. Clamping plate; 32. Threaded parts;

[0039] 4. Liquid level measuring device;

[0040] 100. Battery cell; 200. Voltage detection device. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] like Figure 1 and Figure 2 In the illustrated embodiment, the X direction represents the length direction of the battery cell 100, the Y direction represents the width direction of the battery cell 100, and the Z direction represents the height direction of the battery cell 100. The X, Y, and Z directions are perpendicular to each other. It should be noted that the X, Y, and Z directions can be interchanged. For example, the height direction of the battery cell 100 is the vertical direction.

[0046] This utility model provides a cell testing box and a cell testing system including the cell testing box to meet the testing requirements of different cells 100 and improve the accuracy of test results. It should be noted that the cell testing system tests prismatic cells.

[0047] like Figure 1 and Figure 2 As shown, the battery cell testing box provided by this utility model includes a box body 1 and a cover plate 2. The box body 1 includes a box body and a first baffle 15 and a second baffle 16 disposed in the box body. The box body includes a bottom wall 11, a box side plate 13 and a first box side wall 14. The bottom wall 11 and the cover plate 2 are arranged opposite to each other and spaced apart along the Z direction. The first baffle 15 and the box side plate 13 are arranged spaced apart and opposite to each other along the X direction. The position of the first baffle 15 relative to the box side plate 13 along the X direction is adjustable. The second baffle 16 and the first box side wall 14 are arranged opposite to each other and spaced apart along the Y direction. The position of the second baffle 16 relative to the first box side wall 14 along the Y direction is adjustable. The first baffle 15 and the second baffle 16 are configured to form a sealed, cuboid-shaped testing chamber with the bottom wall 11, the cover plate 2, the box side plate 13 and the first box side wall 14.

[0048] In this cell testing chamber, the first baffle 15 and the second baffle 16 are configured to form a sealed, cuboid-shaped testing chamber with the bottom wall 11, the cover plate 2, the side plate 13, and the first side wall 14. The position of the first baffle 15 can be adjusted along the X direction and the position of the second baffle 16 can be adjusted along the Y direction according to the different sizes of the cells 100, so as to adjust the volume of the testing chamber to meet the volume requirements of different sizes of cells 100. This ensures that the bottom area of ​​the testing chamber minus the bottom area of ​​the cell 100 under test remains unchanged, thereby allowing the same volume of coolant to be injected into the testing chamber and the same liquid level in the testing chamber, which facilitates the horizontal comparison of test results of different types of cells 100.

[0049] This battery cell testing chamber allows for adjustment of both the position of the first baffle 15 along the X-direction and the position of the second baffle 16 along the Y-direction. This ensures that when the battery cell 100 to be tested is placed inside the testing chamber, the distance between the battery cell 100 and the side plate 13 and the first baffle 15 along the X-direction closely approximates the actual situation of the battery cell 100 located inside the chamber 1. Similarly, the distance between the battery cell 100 and the first side wall 14 and the second baffle 16 along the Y-direction closely approximates the actual situation of the battery cell 100 located inside the chamber 1.

[0050] Considering the different sizes of various battery cell models 100, a first baffle 15 of corresponding size needs to be provided for each type of battery cell 100. Therefore, in some embodiments, multiple first baffles 15 are provided, each with a different length along the Y direction. Multiple first baffles 15 can be selected to form a test chamber with the bottom wall 11, the side panel 13, the first side wall 14, the second baffle 16, and the cover plate 2. As an alternative, a telescopic plate can be used as the first baffle 15, or, provided that sealing is ensured, multiple baffles can be spliced ​​together to form the first baffle 15. The baffles suitable for splicing can be selected according to the length requirements along the Y direction to form the first baffle 15.

[0051] When it is necessary to adjust the volume of the test chamber, simply adjust the position of the first baffle 15 along the Y direction and select the first baffle 15 that corresponds to the size of the cell 100 to be tested. The selected first baffle 15, together with the bottom wall 11, the box side plate 13, the first box side wall 14, the second baffle 16, and the cover plate 2, can form the test chamber, thereby meeting the volume requirements of the cell 100 to be tested for the test chamber.

[0052] Specifically, the selected first baffle 15 is sealed between the second baffle 16 and the first chamber side wall 14 along the Y direction, and sealed between the bottom wall 11 and the cover plate 2 along the Z direction. This not only simplifies the replacement of the first baffle 15, but also effectively prevents coolant leakage from the test chamber through the gaps between the first baffle 15 and the bottom wall 11, the first chamber side wall 14, and the second baffle 16. In addition, clamping the first baffle 15 between the second baffle 16 and the first chamber side wall 14 along the Y direction improves the stability of the first baffle 15.

[0053] Among the various battery cells 100 that need to be tested, each battery cell 100 has a matching first baffle 15 to meet the testing requirements of that battery cell 100. When the battery cell 100 to be tested is determined, the corresponding first baffle 15 is selected according to the length of the battery cell 100 to be tested along the Y direction to meet the testing requirements of battery cells 100 with different dimensions along the Y direction.

[0054] It should be noted that the amount of gas produced during thermal runaway tests of the same cell 100 under different conditions or different cells 100 will vary, resulting in different pressures inside the test chamber. To ensure safety and meet test requirements, multiple first baffles 15 can be designed with equal thickness. In this case, the thickness of the first baffle 15 is designed according to the maximum withstand pressure requirement. To save material costs, the first baffle 15 with the corresponding thickness can also be designed according to the withstand pressure requirements of different cells 100 during testing.

[0055] For example, one second baffle 16 is provided. The second baffle 16 and any one of the plurality of first baffles 15 can cooperate with the bottom wall 11, the cover plate 2, the box side plate 13, and the first box side wall 14 to form the test cavity described above.

[0056] Specifically, such as Figure 1 and Figure 2 As shown, the box body 1 also includes a second box side wall 17, and a second baffle 16 is located between the box side plate 13 and the second box side wall 17 along the X direction. One end of the second baffle 16 is sealed and pressed against the box side plate 13 along the X direction, and the other end is pressed against the second box side wall 17 along the X direction. The second baffle 16 can be sealed and clamped between the bottom wall 11 and the cover plate 2 along the Z direction.

[0057] After adjusting the position of the second baffle 16 along the Y direction, the second baffle 16 is sealed between the bottom wall 11 and the cover plate 2 along the Z direction, and one end of the second baffle 16 is sealed against the side plate 13 along the X direction to prevent coolant leakage from the test chamber through the gaps between the second baffle 16 and the bottom wall 11 and the side plate 13. Sealing the second baffle 16 with the cover plate 2 ensures the sealing performance of the entire test chamber. The second baffle 16 is also sealed between the side plate 13 and the second side wall 17 along the X direction, and between the bottom wall 11 and the cover plate 2 along the Z direction to improve its stability. This configuration eliminates the need to replace the second baffle 16; only its position along the Y direction needs adjustment, reducing costs.

[0058] Alternatively, the first baffle 15 can be sealed between the third chamber side wall 12 and the first chamber side wall 14, and the second baffle 16 can be sealed between the chamber side plate 13 and the first baffle 15. Multiple first baffles 15 can be provided, and multiple second baffles 16 can also be provided, with one of the multiple first baffles 15 being used at a time. Alternatively, the first baffle 15 and the second baffle 16 can be integrated to form an L-shaped integrated baffle. Multiple integrated baffles can be provided, and the volume of the test chamber can be adjusted by replacing different integrated baffles.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, the upper surface of the bottom wall 11 is provided with a plurality of first grooves 111 arranged at intervals along the X direction. The plurality of first grooves 111 correspond one-to-one with a plurality of first baffles 15. The plurality of first baffles 15 can be selectively and sealingly inserted into the corresponding first groove 111 along the Z direction, so that the selected first baffle 15 is sealedly inserted into the corresponding first groove 111 at one end along the Z direction.

[0060] By setting multiple first grooves 111, not only can the position of the first baffle 15 be adjusted along the X direction, but the first baffle 15 can also be positioned through the first grooves 111, thereby improving the positional accuracy of the first baffle 15.

[0061] In some embodiments, the selected first baffle 15 is sealed between the second baffle 16 and the first chamber sidewall 14 in the Y direction, and sealed between the bottom wall 11 and the cover plate 2 in the Z direction. This arrangement can improve the stability of the first baffle 15 while ensuring the sealing performance of the test chamber.

[0062] To achieve a sealed connection between the first baffle 15 and the bottom wall 11, the first chamber side wall 14, and the second baffle 16, sealing elements can be provided on the surfaces of the first baffle 15 facing the bottom wall 11, the first baffle 15 facing the first chamber side wall 14, and the first baffle 15 facing the second baffle 16. It should be noted that the sealing element on the surface of the first baffle 15 facing the bottom wall 11 can also be omitted, and a sealing element can be provided on the inner wall of the first groove 111, as long as a sealed connection between the first baffle 15 and the bottom wall 11 is achieved to prevent coolant leakage from the test chamber.

[0063] It should be noted that the spacing between two adjacent first grooves 111 is determined according to the length of different test cells 100 along the X direction, and is not specifically limited here.

[0064] As an alternative, a first driving component can be provided for the first baffle 15. Multiple first baffles 15 can be selectively and detachably connected to the output end of the first driving component. The first driving component is used to drive the connected first baffle 15 to move along the X direction. By driving the connected first baffle 15 to move along the X direction, the position of the first baffle 15 can be adjusted along the X direction. It should be noted that the first driving component can be a cylinder, an electric actuator, etc.

[0065] In some embodiments, such as Figure 1 and Figure 2 As shown, the upper surface of the bottom wall 11 is provided with a plurality of second grooves 112 arranged at intervals along the Y direction, and one end of the second baffle 16 is sealed and inserted into any of the second grooves 112 along the Z direction.

[0066] The second baffle 16 is positioned by the second groove 112, which improves the positional accuracy of the second baffle 16 and also helps to further improve the stability of the second baffle 16 after it is clamped between the box side plate 13 and the second box side wall 17 along the X direction.

[0067] To achieve a sealed connection between the second baffle 16 and the bottom wall 11 and the side panel 13, sealing elements can be provided on both the surface of the second baffle 16 facing the bottom wall 11 and the surface of the second baffle 16 facing the side panel 13. It should be noted that the sealing element on the surface of the second baffle 16 facing the bottom wall 11 can also be omitted, and a sealing element can be provided on the inner wall of the second groove 112, as long as a sealed connection between the second baffle 16 and the bottom wall 11 is achieved to prevent coolant leakage from the test chamber.

[0068] It should be noted that the spacing between two adjacent second grooves 112 is determined according to the length of the different test cells 100 along the Y direction, and is not specifically limited here.

[0069] As an alternative, a second driving component, such as a cylinder or electric actuator, can be provided for the second baffle 16 to drive the second baffle 16 to move along the Y direction. By driving the second baffle 16 to move along the Y direction through the second driving component, the position of the second baffle 16 can be adjusted along the Y direction.

[0070] In some embodiments, such as Figures 1 to 3 As shown, the cell testing box also includes two clamping units 3, each clamping unit 3 being at least partially located within the testing chamber. The two clamping units 3 are arranged at intervals along a preset direction, and the positions of the clamping units 3 along the preset direction are adjustable so that the cell 100 is clamped between the two clamping units 3 along the preset direction. For example, the preset direction is the X direction. By adjusting the position of the clamping units 3 along the preset direction, the cell 100 to be tested is clamped between the two clamping units 3, improving the stability of the cell 100 during testing. Alternatively, the preset direction can also be the Y direction or the Z direction.

[0071] In some embodiments, such as Figures 1 to 3 As shown, taking the preset direction as the X direction as an example, the box side panel 13 includes a side panel body 131 and a mounting plate 132. The side panel body 131 is fixed to the bottom wall 11 and the first box side wall 14. The mounting plate 132 is arranged between the side panel body 131 and the first baffle 15 along the X direction. There are multiple mounting plates 132, and the multiple mounting plates 132 correspond one-to-one with the multiple first baffles 15. The multiple mounting plates 132 are selected to form a test cavity with the bottom wall 11, the first box side wall 14, the second baffle 16, the cover plate 2 and the corresponding first baffle 15. One clamping unit 3 is detachably connected to the selected first baffle 15, and the other clamping unit 3 is detachably connected to the selected mounting plate 132.

[0072] The clamping unit 3 is installed in different positions on different first baffles 15, and the clamping unit 3 is installed in different positions on different side plates 13. Specifically, multiple first baffles 15 correspond one-to-one with various sizes of battery cells 100. The positions on different first baffles 15 for installing the clamping unit 3 are arranged at intervals along the Y direction. The positions on the first baffles 15 for installing the clamping unit 3 corresponding to battery cells 100 with different heights along the Z direction are also arranged at intervals along the Y direction. The positions on the side plates 13 for installing the clamping unit 3 are also arranged at intervals along the Y direction.

[0073] Different sizes of battery cells 100 require different clamping positions. The first baffle 15 and the second baffle 16, as well as the mounting plate 132 with different lengths along the Y direction, can be replaced according to the size of the battery cells 100. That is, the corresponding first baffle 15, second baffle 16 and mounting plate 132 can be selected according to the size of the battery cells 100, so that the battery cells 100 to be tested can be clamped by the clamping unit 3 installed on the selected first baffle 15 and the selected mounting plate 132 respectively, thereby meeting the clamping requirements of different sizes of battery cells 100 with different clamping positions.

[0074] It should be noted that the thickness requirement of the mounting plate 132 is the same as that of the first baffle 15, and will not be repeated here. Multiple mounting plates 132 can be designed to be of equal thickness, and the thickness of the mounting plate 132 can be designed according to the maximum withstand voltage requirement. Alternatively, the mounting plate 132 of the corresponding thickness can be designed according to the withstand voltage requirement when different cells 100 are tested.

[0075] Specifically, taking the preset direction as the X direction as an example, the clamping unit 3 includes a threaded component 32 extending along the X direction and a clamping plate 31 located in the test chamber. The threaded component 32 of one clamping unit 3 passes through the selected first baffle 15 in a sealed manner and is connected to the clamping plate 31 and threadedly connected to the selected first baffle 15. The threaded component 32 of the other clamping unit 3 passes through the selected mounting plate 132 in a sealed manner and is connected to the clamping plate 31 and threadedly connected to the selected mounting plate 132. The battery cell 100 to be tested is clamped between the clamping plates 31 of the two clamping units 3 by tightening the threaded component 32, which is simple and quick to operate. For example, the first baffle 15 is provided with a first through hole 151, and the threaded component 32 of one clamping unit 3 is threadedly connected to the first through hole 151; the mounting plate 132 is provided with a second through hole, and the threaded component 32 of the other clamping unit 3 is threadedly connected to the second through hole.

[0076] To facilitate the replacement of the first baffle 15 and the mounting plate 132, the clamping plate 31 and the connected threaded part 32 are inserted into each other. With this configuration, when replacing the first baffle 15 and the mounting plate 132, the two clamping units 3 can be removed and then installed on the selected first baffle 15 and mounting plate 132 respectively.

[0077] The cell 100 to be tested is placed on the bottom wall 11 so that the cell 100 to be tested is supported by the bottom wall 11. Tightening the threaded part 32 connected to the first baffle 15 controls the clamping plate 31 connected to the threaded part 32 to move in the X direction. Tightening the threaded part 32 connected to the selected mounting plate 132 controls the clamping plate 31 connected to the threaded part 32 to move in the X direction, so that the cell 100 to be tested is clamped between the clamping plates 31 of the two clamping units 3 in the X direction, thereby improving the stability of the cell 100 to be tested.

[0078] Both clamping units 3 have clamping plates 31 that can move along the X direction to adjust the distance between the battery cell 100 to be tested and the mounting plate 132, as well as the distance between the battery cell 100 to be tested and the first baffle 15, according to the different sizes of the battery cells 100. This setting can prevent the battery cell 100 to be tested from being too close to one of the mounting plate 132 and the first baffle 15 and too far from the other, so that the environment in which the battery cell 100 to be tested is closer to the real environment.

[0079] For example, each clamping unit 3 includes four threaded parts 32 and four clamping plates 31 corresponding to the four threaded parts 32. The mounting plate 132 and the first baffle 15 are selected according to the size of the battery cell 100, so that the four clamping plates 31 of one clamping unit 3 respectively press against the four corners of one side of the battery cell 100 in the X direction, and the four clamping plates 31 of another clamping unit 3 respectively press against the four corners of the other side of the battery cell 100 in the X direction.

[0080] It should be noted that the threaded part 32 located below the liquid level in the test chamber and the first baffle 15 or mounting plate 132 connected thereto can be sealed by a seal. This is a common sealing method in the art and will not be described in detail here.

[0081] As an alternative, other clamping units 3 can also be used. Specifically, the clamping unit 3 includes a clamping plate 31 located inside the test chamber and a guide rod connected to the clamping plate 31 at one end. Each clamping unit 3 is equipped with a clamping drive located outside the test chamber. The other end of the guide rod of one clamping unit 3 is sealed and movable in the X direction through the selected first baffle 15 and then connected to the output end of the equipped clamping drive. The other end of the guide rod of the other clamping unit 3 is sealed and movable in the X direction through the selected box side plate 13 and then connected to the output end of the equipped clamping drive. For example, the clamping drive can be a cylinder or an electric actuator, etc. The first baffle 15 is provided with a first through hole. The output end of one of the clamping drives slides through the selected first through hole in the X direction and is connected to the corresponding clamping plate 31. A sealing element is provided between the output end of the clamping drive and the inner wall of the first through hole. The mounting plate 132 is provided with a second through hole. The output end of another clamping drive slides through the second through hole in the X direction and is connected to the corresponding clamping plate 31. A sealing element is provided between the output end of the clamping drive and the inner wall of the second through hole.

[0082] It should be noted that the positions for mounting clamping units 3 on different mounting plates 132 are arranged at intervals along the Y direction, and the positions for mounting clamping units 3 on the mounting plates 132 corresponding to battery cells 100 with different heights along the Z direction are also arranged at intervals along the Y direction, to meet the clamping requirements of battery cells 100 of different sizes. Each clamping unit 3 may include four clamping plates 31 and a clamping drive. The output end of a clamping drive is connected to a connecting frame, which has four connecting rods. The four connecting rods are movably passed through the selected mounting plate 132 along the X direction and are connected one-to-one to the four clamping plates 31. The clamping drive drives the four clamping plates 31 to move synchronously. Alternatively, each clamping unit 3 may include four clamping plates 31 and four clamping drive members, with the four clamping plates 31 and the four clamping drive members connected one-to-one.

[0083] In some embodiments, when the mounting plate 132 is replaceable, to facilitate fixing the mounting plate 132, one of the multiple mounting plates 132 is selectively and sealingly clamped between the first box side wall 14 and the second baffle 16 along the Y direction, and the selected mounting plate 132 can be selectively and sealingly clamped between the bottom wall 11 and the cover plate 2 along the Z direction. Specifically, the bottom wall 11 is provided with a third groove 113, and the selected mounting plate 132 is sealedly inserted into the third groove 113 at one end in the Z direction. The selected mounting plate 132 is sealedly clamped between the first box side wall 14 and the second baffle 16 along the Y direction to improve the stability of the mounting plate 132.

[0084] As an alternative, the entire side panel 13 can be replaced directly. Taking the preset direction as the X direction as an example, multiple side panels 13 are provided, arranged at intervals along the Y direction. Each side panel 13 corresponds to a first baffle 15. One of the side panels 13 can be detachably connected to the bottom wall 11 and the first side wall 14. One of the side panels 13, together with the bottom wall 11, the first side wall 14, the corresponding first baffle 15, the second baffle 16, and the cover plate 2, forms a test chamber. One clamping unit 3 is detachably connected to the selected first baffle 15, and another clamping unit 3 is detachably connected to the selected side panel 13. The installation positions of the clamping units 3 on different side panels 13 are different. Specifically, the positions for installing the clamping units 3 on different side panels 13 are arranged at intervals along the Y direction, and the positions for installing the clamping units 3 on the side panels 13 corresponding to the battery cells 100 with different heights along the Z direction are also arranged at intervals along the Y direction.

[0085] It should be noted that, when replacing the entire side panel 13, to facilitate the fixing of the side panel 13, the box body 1 also includes a third side wall 12 fixed to the bottom wall 11 and arranged at intervals opposite to and from the second baffle 16 along the Y direction. The second baffle 16 is located between the third side wall 12 and the first side wall 14 along the Y direction. The bottom wall 11 is provided with a third groove 113. The selected side panel 13 is sealed and inserted into the third groove 113 at one end in the Z direction. One end of the selected side panel 13 is sealed and pressed against the first side wall 14 along the Y direction, and the other end is sealed and pressed against the third side wall 12 along the Y direction. By adding the third side wall 12, the selected side panel 13 can be sealed and inserted into the third groove 113 at one end in the Z direction, and the selected side panel 13 can be sandwiched between the first side wall 14 and the third side wall 12 along the Y direction, thereby improving the stability of the side panel 13.

[0086] When it is necessary to trigger thermal runaway in the battery cell 100 by needle puncture, specifically, the needle is inserted into the battery cell 100 in a direction perpendicular to the electrode plates of the battery cell 100, causing a short circuit between the positive and negative electrode plates of the battery cell 100. This causes the energy of the battery cell 100 to be rapidly released through the short circuit point in a short time, resulting in a rapid increase in temperature in a short period of time. This can effectively simulate the extreme situation of thermal runaway caused by an internal short circuit in the battery cell 100. For this purpose, in some embodiments, the first baffle 15 is provided with a first needle puncture hole 152 arranged through the X direction, and the positions of the first needle puncture holes 152 on at least two first baffles 15 are different along the Z direction.

[0087] The corresponding first baffle 15 can be selected according to the size of the battery cell 100 to be tested. The position of the first needle hole 152 on the first baffle 15 is determined according to the corresponding battery cell 100, so that after the needle enters the test chamber through the first needle hole 152, it can puncture the center position of the side of the battery cell 100 facing the first baffle 15.

[0088] It should be noted that there may be two first needle holes 152 on the first baffle 15 with different positions along the Y direction and arranged at intervals along the Z direction; there may be two first needle holes 152 on the first baffle 15 with different positions along the Y direction and the same position along the Z direction; there may be two first needle holes 152 on the first baffle 15 with the same position along the Y direction and different positions along the Z direction.

[0089] To facilitate the insertion of the needle into the battery cell 100, the needle is connected to a needle-piercing drive component, such as a cylinder or electric actuator. The needle-piercing drive component drives the needle to move in the X direction, so that the needle passes through the first needle-piercing hole 152 and pierces the battery cell 100. The needle-piercing drive component can be set in the cavity enclosed by the first baffle 15 and the second side wall 17 of the housing. To facilitate the operation of the needle-piercing drive component, a control panel that is communicatively connected to the needle-piercing drive component can also be provided. In this case, the control panel can be placed outside the battery cell testing housing 1, and the tester can control the start and stop of the needle-piercing drive component through the control panel.

[0090] Since the battery cell 100 is usually tested after the cover plate 2 has been connected to the housing 1, for a scheme where the needle driving component is located outside the housing 1, the second housing side wall 17 will block the needle from passing through the first needle hole 152. In order to facilitate the needle to pass through the first needle hole 152 and then penetrate into the battery cell 100, in some embodiments, the second housing side wall 17 is provided with at least one second needle hole that is arranged through the X direction. The projection of the first needle hole 152 in a preset plane perpendicular to the X direction is the first projection, and the projection of the second needle hole in the preset plane is the second projection. The first needle hole 152 on any selected first baffle 15 can be matched with a second needle hole, and the first projection of the first needle hole 152 on any selected first baffle 15 is completely located within the second projection of the matched second needle hole.

[0091] Specifically, the second box side wall 17 is provided with a plurality of second needle holes arranged through the X direction, and the plurality of first baffles 15 and the plurality of second needle holes correspond one to one. The first needle hole 152 on the selected first baffle 15 can be arranged directly opposite the second needle hole corresponding to the first baffle 15 along the X direction.

[0092] When thermal runaway of the battery cell 100 is triggered by needle puncture, a first baffle 15 is selected according to the size of the battery cell 100, and a second needle puncture hole on the side wall 17 of the second box corresponding to the selected first baffle 15 is inserted into the battery cell 100 after the needle passes through the selected second needle puncture hole on the side wall 17 of the second box and the first needle puncture hole 152 on the selected first baffle 15 in sequence.

[0093] As an alternative, a second needle-piercing hole can be provided on the side wall 17 of the second enclosure. The projection of the first needle-piercing hole 152 onto a preset plane perpendicular to the X direction is the first projection, and the projection of the second needle-piercing hole onto the preset plane is the second projection. The first projection of the first needle-piercing hole 152 on any selected first baffle 15 is completely within the second projection. With this configuration, regardless of which first baffle 15 is selected, the needle can pass through the second needle-piercing hole and then through the first needle-piercing hole 152 on the selected first baffle 15 to pierce into the battery cell 100 to be tested.

[0094] As an alternative, the first needle-piercing hole 152 can also be provided on the side panel 13 of the enclosure. Multiple first needle-piercing holes 152 are provided on each side panel 13. Based on the size of the battery cell 100 corresponding to each side panel 13, a first needle-piercing hole 152 is provided on the side panel 13 that can pierce the center position of the side facing the battery cell 100. It should be noted that providing the first needle-piercing hole 152 on the side panel 13 is only applicable to cases where the mounting plate 132 of the side panel 13 is replaceable. If other clamping methods are used, and a driving component is provided for the clamping plate 31, making the position of the clamping plate 31 relative to the bottom wall 11 adjustable in the Y direction, then arranging the first needle-piercing hole 152 on the side panel 13 will not be able to ensure that the needle passing through the first needle-piercing hole 152 is aligned with the center position of different battery cells 100.

[0095] As an alternative, the first needle hole 152 can also be set on the side wall 14 of the first box. Since the side wall 14 of the first box does not need to be replaced, multiple first needle holes 152 corresponding to multiple battery cells 100 of different sizes can be set on the side wall 14 of the first box. When using one of the first needle holes 152, the other first needle holes 152 can be sealed with a detachable sealing member.

[0096] As an alternative, the first needle piercing hole 152 can be set on the second baffle 16. In this case, multiple second baffles 16 can be set one-to-one with multiple battery cells 100 of different sizes. The first needle piercing hole 152 matching the corresponding battery cell 100 is set on the second baffle 16, so that after the needle passes through the first needle piercing hole 152 on the second baffle 16 of the battery cell 100 to be tested, it can penetrate into the center position of the side of the battery cell 100 facing the second baffle 16. When the first needle piercing hole 152 is set on the second baffle 16, the second baffle 16 can also be left unreplaced. Multiple first needle piercing holes 152 corresponding to multiple battery cells 100 of different sizes can be set on the second baffle 16. When using one of the first needle piercing holes 152, the other first needle piercing holes 152 are blocked by a detachable sealing member. It should be noted that when the clamping unit 3 is installed on the side plate 13 and the first baffle 15, it is preferable to set the first needle hole 152 on the side plate 13 and the first baffle 15 where the clamping unit 3 is installed, so as to avoid the position of the battery cell 100 changing when the needle penetrates the battery cell 100.

[0097] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, at least one of the box side panel 13, the first box side wall 14, and the second baffle 16 is a transparent explosion-proof glass panel. For example, the first box side wall 14 is a transparent explosion-proof glass panel.

[0098] When conducting thermal runaway tests on battery cell 100, the test conditions inside the test chamber can be observed through transparent explosion-proof glass. This allows for a comprehensive analysis of the causes, phenomena, and consequences of thermal runaway in battery cell 100, enabling the implementation of corresponding measures for prevention and solutions. It should be noted that when the second baffle 16 is set as a transparent explosion-proof glass plate, the third box side wall 12 can be removed, or the third box side wall 12 can also be made of explosion-proof glass, or an installation window can be opened on the third box side wall 12 and explosion-proof glass can be installed in the installation window.

[0099] As an alternative, at least one of the portions of the test chamber formed by the side panel 13, the first side wall 14, and the second baffle 16 can be provided with an installation window, which is fitted with transparent explosion-proof glass. It should be noted that when an installation window is provided on the second baffle 16 forming the test chamber, the third side wall 12 is omitted.

[0100] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the cell testing chamber also includes a liquid level measuring element 4 for measuring the liquid level in the testing chamber. A heating unit is provided inside the testing chamber for heating the cell 100 to be tested. It should be noted that a test cell specifically designed for thermal runaway testing, with an internal heating unit such as a heating plate, can be used. Alternatively, the heating unit, such as a heating plate, can be attached to the outer wall of the cell 100 immersed in coolant. The specific configuration of the heating unit is prior art and will not be described in detail here.

[0101] For example, when the first tank side wall 14 is made of transparent explosion-proof glass, the liquid level measuring element 4 is installed on the surface of the first tank side wall 14 facing away from the second baffle 16. In this case, the liquid level measuring element 4 adopts a liquid level measuring structure such as a liquid level gauge for manual observation of the liquid level, to avoid damage to the liquid level measuring element 4 in the event of thermal runaway of the battery cell 100. It should be noted that the liquid level measuring element 4 can be a scale provided on the explosion-proof glass plate. In this case, the liquid level measuring element 4 can be provided on the surface of the first tank side wall 14 facing away from the second baffle 16, or it can be provided on the surface of the first tank side wall 14 facing the second baffle 16.

[0102] By setting up a liquid level measuring device 4 and a heating unit, tests can be conducted to induce thermal runaway in different battery cells 100 at the same liquid level by adjusting the power of the heating unit, as well as to induce thermal runaway in the same battery cell 100 at a preset power by adjusting the liquid level. Through the test of inducing thermal runaway in the same battery cell 100 at a preset power by adjusting the liquid level, the limiting liquid level at which thermal runaway occurs in the same battery cell 100 at the preset power can be obtained.

[0103] When cell 100 experiences thermal runaway, it generates gases such as CO2, CO, H2, CxHy, CxHyOz, CxHyF, POF3, and HF. For safety reasons, these gases need to be vented. Therefore, in some embodiments, the test chamber has an exhaust channel.

[0104] Specifically, the cover plate 2 is movably connected to the housing 1 along the Z direction, so that the cover plate 2 can selectively seal the housing 1, or be spaced apart from the housing 1 along the Z direction to form an exhaust channel.

[0105] For example, the cover plate 2 is sealed to the housing 1 by a plurality of fasteners. Specifically, threaded holes are provided on the side plate 13 and the second side wall 17 of the housing. After the fasteners pass through the cover plate 2, they are threaded into the threaded holes to connect the cover plate 2 to the housing 1.

[0106] To achieve a seal, the upper surfaces of the side panel 13, the first side wall 14, the second side wall 17, the first baffle 15, and the second baffle 16 are all flush. Sealing elements are provided on the upper surfaces of the side panel 13, the first side wall 14, the second side wall 17, the first baffle 15, and the second baffle 16. When the cover plate 2 is connected to the box body 1, a sealed test chamber is formed.

[0107] For example, the cell test box adopts a rectangular box structure with a length of 300mm to 400mm along the X direction, a width of 100mm to 200mm along the Y direction, and a height of 150mm to 250mm along the Z direction.

[0108] When the test chamber requires venting, fasteners can be tightened and spacers placed between the cover plate 2 and the chamber 1, allowing the cover plate 2 and the chamber 1 to be spaced apart along the Z-direction to form an venting channel, facilitating the discharge of gas from the test chamber. The flow area of ​​the venting channel can also be adjusted by regulating the distance between the top surfaces of the cover plate 2 and the chamber 1. Thermal runaway tests can then be conducted on venting channels with different flow areas to determine the optimal flow area for the venting channel based on the test results.

[0109] As an alternative, a lifting drive can be provided for the cover plate 2. The output end of the lifting drive is connected to the cover plate 2. The lifting drive drives the cover plate 2 to rise and fall, so as to press the cover plate 2 tightly against the upper surface of the housing 1. The lifting drive also applies downward pressure to the housing 1 to prevent the cover plate 2 from being lifted when the internal air pressure is high during the thermal runaway test of the battery cell 100, which helps to improve the safety of the test.

[0110] In some embodiments, such as Figure 1 , Figure 2 and Figure 5As shown, there are multiple cover plates 2, which are made of different materials and / or have different thicknesses. One of the multiple cover plates 2 can be detachably connected to the box body 1, such as by fastening the cover plate 2 to the box body 1. The fire resistance of the cover plate 2 can be verified under thermal runaway conditions by replacing the top cover with a cover of different materials and the cover plate 2 with a cover of different thicknesses.

[0111] In some embodiments, in order to monitor the condition of the cell 100 in real time during the test, temperature detection elements such as temperature sensors are arranged on the positive and negative terminals, the explosion-proof valve, the center position of the surface of the cell 100 perpendicular to its width direction, the center position of the surface of the cell 100 perpendicular to its length direction, and the center of the bottom surface of the cell 100, so as to monitor the temperature changes of various parts of the cell 100 during the test.

[0112] In some embodiments, such as Figure 1 and Figure 2 As shown, voltage detection devices 200, such as voltage sensors, are arranged at the positive and negative terminals of the battery cell 100 to monitor the voltage changes of the battery cell 100 during the test.

[0113] It should be noted that a wire hole can be provided on the cover plate 2 for threading the wires connected to the temperature detection element and voltage detection element 200.

[0114] In some embodiments, to facilitate the injection of coolant into the battery cell 100 and ensure continuous flow of coolant, the test chamber has an inlet and an outlet. Low-temperature coolant enters the test chamber through the inlet, immersing the battery cell 100 under test in the coolant. The coolant absorbs the heat generated by the battery cell 100, heats up, and then exits through the outlet. Exemplarily, the inlet is located on the side panel 13 of the chamber, and the outlet is located on the bottom wall 11.

[0115] It should be noted that during the test, low-temperature coolant was constantly entering the test chamber through the inlet, while the heated coolant was continuously being discharged through the outlet.

[0116] The process of testing battery cell 100 using a preferred battery cell testing system provided in this embodiment of the invention is as follows:

[0117] Select the corresponding first baffle 15, second baffle 16, and mounting plate 132 according to the model of the battery cell 100 to be tested, and determine the positions of the first baffle 15 and second baffle 16 according to the size of the battery cell 100. Then fix the first baffle 15 and second baffle 16. Then place the battery cell 100 in the test chamber and clamp the battery cell 100 along the X direction using the clamping unit 3. Then connect the cover plate 2 to the side plate body 131, the third box side wall 12, the second box side wall 17, and the first box side wall 14. Then inject low-temperature coolant into the test chamber according to the test requirements, and make the heated coolant continuously flow out through the outlet so that the liquid level in the test chamber meets the test requirements. Then, according to the test requirements, perform needle penetration triggered thermal runaway test, heating triggered thermal runaway test, etc.

[0118] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cell test box, characterized by, include: The box body (1) includes a box body and a first baffle (15) and a second baffle (16); the box body includes a bottom wall (11), a box side panel (13) and a first box side wall (14); the first baffle (15) and the box side panel (13) are spaced apart and opposite to each other along the X direction, and the position of the first baffle (15) relative to the box side panel (13) along the X direction is adjustable; the second baffle (16) and the first box side wall (14) are opposite to each other and spaced apart along the Y direction, and the position of the second baffle (16) relative to the first box side wall (14) along the Y direction is adjustable; The cover plate (2) and the bottom wall (11) are arranged opposite to each other and spaced apart along the Z direction, and the X direction, the Y direction and the Z direction are perpendicular to each other; the first baffle (15) and the second baffle (16) are configured to form a sealed test chamber with the bottom wall (11), the cover plate (2), the box side plate (13) and the first box side wall (14).

2. The battery cell test box of claim 1, wherein, The first baffle (15) is provided in multiple ways, and each first baffle (15) has a different length along the Y direction. The multiple first baffles (15) can be selected to form the test cavity with the bottom wall (11), the box side plate (13), the first box side wall (14), the second baffle (16), and the cover plate (2).

3. The battery cell test box of claim 2, wherein, The upper surface of the bottom wall (11) is provided with a plurality of first grooves (111) spaced apart along the X direction, and one of the plurality of first baffles (15) can be selectively and sealingly inserted into any of the first grooves (111) along the Z direction; or, the cell test box further includes a first driving member, and one of the plurality of first baffles (15) can be detachably connected to the output end of the first driving member, and the first driving member is used to drive the first baffle (15) connected thereto to move along the X direction.

4. The battery cell test box of claim 2, wherein, The first baffle (15) is provided with a first needle hole (152) that runs through the X direction; The positions of the first needle holes (152) on different first baffles (15) along the Y direction are different; and / or, the positions of the first needle holes (152) on at least two first baffles (15) along the Z direction are different.

5. The battery cell test box of any one of claims 2 to 4, wherein, The box body (1) further includes a second box side wall (17), and the second baffle (16) is located between the box side plate (13) and the second box side wall (17) along the X direction; one end of the second baffle (16) is sealed and pressed against the box side plate (13) along the X direction, and the other end is pressed against the second box side wall (17) along the X direction; the second baffle (16) is sealed and sandwiched between the bottom wall (11) and the cover plate (2) along the Z direction; And / or, the selected first baffle (15) is sealed between the second baffle (16) and the first box sidewall (14) along the Y direction, and sealed between the bottom wall (11) and the cover plate (2) along the Z direction.

6. The battery cell test box of claim 5, wherein, The first baffle (15) is provided with a first needle hole (152) that runs through the X direction, and the box body (1) also includes a second box side wall (17); The second box sidewall (17) is provided with at least one second needle hole that is provided through the X direction. The projection of the first needle hole (152) in a preset plane perpendicular to the X direction is the first projection, and the projection of the second needle hole in the preset plane is the second projection. The first needle hole (152) on any of the first baffles (15) can be matched with a second needle hole, and the first projection of the first needle hole (152) on any of the first baffles (15) is completely located within the second projection of the matched second needle hole.

7. The cell testing box according to any one of claims 1 to 4, characterized in that, The upper surface of the bottom wall (11) is provided with a plurality of second grooves (112) arranged at intervals along the Y direction, and one end of the second baffle (16) is sealed in any of the second grooves (112) along the Z direction; Alternatively, the second baffle (16) is connected to a second driving member for driving the second baffle (16) to move along the Y direction.

8. The cell testing box according to any one of claims 1 to 4, characterized in that, The cell testing box also includes two clamping units (3), which are at least partially located inside the testing cavity; Two clamping units (3) are arranged at intervals along a preset direction. The position of the clamping unit (3) along the preset direction is adjustable so that the battery cell (100) is clamped between the two clamping units along the preset direction. The preset direction is any one of the X direction, Y direction and Z direction.

9. The cell testing box according to claim 8, characterized in that, The side panel (13) of the box includes a side panel body (131) and a mounting plate (132). The side panel body (131) is fixed to the bottom wall (11) and the first box side wall (14). The mounting plate (132) is disposed between the side panel body (131) and the first baffle (15) along the X direction. The mounting plate (132) is provided in multiple ways, and the multiple mounting plates (132) correspond one-to-one with the multiple first baffles (15). One of the multiple mounting plates (132) is selected to form the test cavity with the bottom wall (11), the first box side wall (14), the second baffle (16), the cover plate (2) and the corresponding first baffle (15). One of the clamping units (3) is detachably connected to the selected first baffle (15), and the other clamping unit (3) is detachably connected to the selected mounting plate (132).

10. The cell testing box according to any one of claims 1 to 4, characterized in that, At least one of the box side panel (13), the first box side wall (14) and the second baffle (16) is a transparent explosion-proof glass plate, or, at least one of the box side panel (13) forming the test cavity, the first box side wall (14) forming the test cavity and the second baffle (16) forming the test cavity is provided with an installation window, and the installation window is fitted with transparent explosion-proof glass; And / or, the cell test chamber further includes a liquid level measuring element (4) for measuring the liquid level in the test chamber.

11. The cell testing box according to any one of claims 1 to 4, characterized in that, The cover plate (2) is movably connected to the box body (1) along the Z direction, so that the cover plate (2) can selectively seal the box body (1), or be spaced apart from the box body (1) along the Z direction to form an exhaust channel; And / or, the cover plate (2) is provided in multiple ways, the multiple cover plates (2) are made of different materials and / or have different thicknesses, and one of the multiple cover plates (2) is detachably connected to the box body (1).

12. A cell testing system, characterized in that, Includes the cell testing box as described in any one of claims 1 to 11.

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