End plate, battery module and expansive force test system

Abstract

The utility model provides an end plate, a battery module and an expansive force test system, the two sides of the end plate along the thickness direction are respectively provided with an abutting surface and a stress surface, the abutting surface and the stress surface are arranged in parallel, the abutting surface can abut against a battery cell group, and the stress surface can cling to a test fixture; at least part of the stress surface is located on the periphery of the abutting surface, and the part of the end plate where the stress surface is located is detachably connected with the test clamp. The abutting surface and the stress surface of the end plate are respectively positioned on two opposite sides, the abutting surface abuts against the battery cell group, and the stress surface is tightly attached to the test fixture, so that after the end plate is connected with the test fixture, the test fixture can stably support the end plate and the battery cell group which is vertically arranged on the abutting surface through the stress surface; therefore, the test requirement of the battery cell group in the vertical posture can be met.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an end plate, a battery module and an expansion force testing system. Background Art

[0002] During the production process of lithium-ion batteries, the expansion force of the battery module will increase with the number of charging cycles. Therefore, the expansion force test is a key factor in evaluating whether the battery module structure is safe.

[0003] At present, when performing an expansion force test on a battery module, the battery cell group in the battery module is usually placed on a base in a horizontal position, and the base is used to support the battery cell group, and the two end plates connected to the opposite sides of the battery cell group are locked on the base, so that the battery cell group is stably fixed in the space defined by the base and the two end plates, and then the test fixture can smoothly perform an expansion force test on the battery module. However, under the above-mentioned fixing method of the battery cell group, the test can only be performed in a horizontal position, which cannot meet the test needs in a vertical position. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an end plate of a battery module to solve the technical problem in the related art that the testing requirements in a vertical position cannot be met.

[0005] In a first aspect, an embodiment of the present application provides an end plate of a battery module, comprising:

[0006] An end plate of a battery module, wherein abutment surfaces and force-bearing surfaces are respectively arranged on both sides of the end plate in the thickness direction, the abutment surfaces are arranged parallel to the force-bearing surfaces, the abutment surfaces can abut against a battery cell group, and the force-bearing surfaces can be tightly attached to a test fixture; at least part of the force-bearing surfaces is located outside the abutment surfaces, and the part of the end plate where the force-bearing surfaces are located is detachably connected to the test fixture.

[0007] In one embodiment, the end plate includes a main body and a connecting portion, the connecting portion is fixedly connected to the main body and protrudes from the main body, the abutting surface is located on the main body, the main body has a first fitting surface on the side facing away from the abutting surface, the connecting portion has a second fitting surface, and the first fitting surface and the second fitting surface together constitute the force-bearing surface.

[0008] In one embodiment, the first bonding surface and the second bonding surface are spaced apart from each other; and / or, the first bonding surface and the second bonding surface are coplanar; and / or, the first bonding surface and the second bonding surface are both multiple.

[0009] In one embodiment, a plurality of positioning posts are formed at intervals on a side of the main body portion facing away from the battery cell group. The positioning posts are provided with positioning holes, and the end faces of the positioning posts constitute the first fitting surface. A second reinforcing rib is formed on a side of the main body portion facing away from the battery cell group. The second reinforcing rib is connected to the plurality of positioning posts and is arranged in a "rice" shape.

[0010] In one embodiment, an overflow glue groove is provided at a position corresponding to the periphery of the battery cell group on the abutting surface; and / or, the main body portion has a side surface connected between the abutting surface and the first fitting surface, and the side surface is provided with a threaded hole through which a threaded connector can pass; and / or, the main body portion has a side surface connected between the abutting surface and the first fitting surface, and the side surface is provided with a first mounting position and a second mounting position. The first mounting position is configured to mount an insulating block, and the second mounting position is configured to mount a communication terminal.

[0011] In one embodiment, there are two connecting portions, and the two connecting portions are connected to opposite sides of the main body portion; and / or, the end plate includes a first reinforcing rib, and the first reinforcing rib is located on a side of the connecting portion facing the battery cell group and connects the connecting portion and the main body portion.

[0012] In one embodiment, a card slot is formed on the end plate, and the card slot is configured to accommodate a binding strap.

[0013] In one embodiment, the end plate is an integrally formed structure.

[0014] In a second aspect, an embodiment of the present application provides a battery module, including:

[0015] A battery cell group;

[0016] The above-mentioned end plates, there are two end plates, and the abutting surfaces of the two end plates respectively abut against opposite sides of the battery cell group; and

[0017] A binding strap, which is wound around the periphery of the battery cell group and the two end plates to bind the battery cell group and the two end plates.

[0018] In a third aspect, an embodiment of the present application provides an expansion force testing system, including:

[0019] A test fixture, including two clamping plates, and the two clamping plates are arranged at intervals in the vertical direction and the distance therebetween is variable; and

[0020] The above-mentioned battery module, in the battery module, the two end plates are detachably connected to the two clamping plates one by one; among the two end plates, the end plate at the lower position in the vertical direction supports the battery cell group.

[0021] The beneficial effects of the end plate of the battery module provided by the embodiments of the present application are as follows: Since the abutting surface and the stress-bearing surface of the end plate are located on opposite sides respectively, the abutting surface abuts against the battery cell group, and the stress-bearing surface is closely attached to the test fixture. After the end plate is connected to the test fixture, the test fixture can stably support the end plate and the battery cell group placed in a vertical posture on the abutting surface through the stress-bearing surface, so that the test requirements of the battery cell group in the vertical placement posture can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic three-dimensional structure diagram of the battery module expansion force test system provided by the embodiments of the present application;

[0024] Figure 2 is Figure 1 a schematic structure diagram of the battery module in the battery module expansion force test system shown;

[0025] Figure 3 is Figure 2 a schematic structure diagram of the lower-position end plate in the battery module described above;

[0026] Figure 4 is Figure 3 a schematic structure diagram of the second view angle of the end plate shown;

[0027] Figure 5 is Figure 3 a schematic structure diagram of the third view angle of the end plate shown;

[0028] Figure 6 is Figure 3 a schematic structure diagram of the fourth view angle of the end plate shown;

[0029] Figure 7 is Figure 3 a schematic structure diagram of the fifth view angle of the end plate shown and its partial enlarged view;

[0030] Among them, the reference numerals in the drawings:

[0031] 10. Battery module expansion force test system; 20. Battery module; 100. Battery cell group; 300. End plate; 31. Contact surface; 32. Stress surface; 310. Main body; 311. Side opening; 312. First fitting surface; 313. Positioning post; 314. Positioning hole; 315. Second reinforcing rib; 316. Glue overflow groove; 317. Side; 318. Threaded hole; 319a. First mounting position; 319b. Second mounting position; 330. Connecting part; 331. Threaded connection hole; 332. Second fitting surface; 340. First reinforcing rib; 350. Card slot; 360. Lug; 500. Tie strap; 90. Test fixture; 910. Clamping plate; 920. Guide rod; 930. Bottom plate; 940. Adjusting part; 950. Elastic part; 960. Vertical placement base; 970. Limiting part. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0036] Please refer to Figures 1 to 7, the battery module 20 provided in the embodiment of the present application is now described. The battery module 20 includes a battery cell group 100, an end plate 300 and a binding band 500. There are two end plates 300, and the two end plates 300 are respectively abutted against opposite sides of the battery cell group 100. The binding band 500 is wound around the battery cell group 100 and the two end plates 300 to bind the battery cell group 100 to the two end plates 300, and the battery module 20 cooperates with the test fixture 90 to realize the expansion force test. The structure of the end plate 300 is described as follows.

[0037] The end plate 300 is provided with abutting surfaces 31 and force-bearing surfaces 32 on both sides along the thickness direction, respectively. The abutting surfaces 31 and the force-bearing surfaces 32 are arranged in parallel, the abutting surfaces 31 can abut against the battery pack 100, and the force-bearing surfaces 32 can be closely attached to the test fixture 90. At least part of the force-bearing surface 32 is located outside the abutting surface 31, and the part of the end plate 300 where it is located is detachably connected to the test fixture 90.

[0038] For the above-mentioned end plate 300, since its abutting surface 31 and the force-bearing surface 32 are respectively located on opposite sides, the abutting surface 31 abuts against the battery cell group 100, and the force-bearing surface 32 is close to the test fixture 90. After the end plate 300 is connected to the test fixture 90, the test fixture 90 can stably support the end plate 300 and the battery cell group 100 placed in a vertical posture on the abutting surface 31 through the force-bearing surface 32, thereby meeting the testing needs of the battery cell group 100 in a vertical posture.

[0039] Combination Figures 2 to 6 As shown, specifically in the embodiment of the present application, the end plate 300 includes a main body 310 and a connecting portion 330, the connecting portion 330 is fixedly connected to the main body 310 and protrudes from the main body 310, the abutting surface 31 is located on the main body 310, the side of the main body 310 away from the abutting surface 31 has a first fitting surface 312, the connecting portion 330 has a second fitting surface 332, and the first fitting surface 312 and the second fitting surface 332 together constitute a force-bearing surface 32. It can be understood that by providing the first fitting surface 312 on the main body 310 and the second fitting surface 332 on the connecting portion 330, the end plate 300 and the test fixture 90 can be stably fitted together, ensuring that the test fixture 90 can stably support the end plate 300 and the battery cell group 100. In addition, since the connecting portion 330 protrudes from the main body 310, the second fitting surface 332 on the connecting portion 330 is located at the periphery of the abutting surface 31, so that the connecting portion 330 where the second fitting surface 332 is located is detachably connected to the test fixture 90, thereby the connecting portion 330 and the test fixture 90 can be stably connected. In addition, by making the connecting portion 330 protrude from the main body 310, it is convenient for the operator to disassemble the connecting portion 330 and the test fixture 90 when the main body 310 and the battery cell group 100 are abutted.

[0040] Specifically, there are two connecting portions 330, and the two connecting portions 330 are connected to opposite sides of the main body portion 310. Since both of the two connecting portions 330 are connected to the test fixture 90, there can be multiple connections between the end plate 300 and the test fixture 90, so as to improve the connection stability between the end plate 300 and the test fixture 90. In addition, since the two connecting portions 330 are stably connected to the test fixture 90 on opposite sides of the main body portion 310, it can help the main body portion 310 to abut against the battery cell group 100 smoothly, and realize the stable support of the end plate 300 for the battery cell group 100.

[0041] In the present application, for the battery cell group 100, it has a cubic structure, and multiple battery cells in the battery cell group 100 are arranged in sequence in the vertical direction. In this way, the upper and lower surfaces of the battery cell group 100 in the vertical direction will respectively abut against the two end plates 300. As Figures 1 to 7 shown, the direction indicated by the Z-axis is the vertical direction, and the directions indicated by the X-axis and the Y-axis are both horizontal directions perpendicular to the Z-axis. In the embodiment of the present application, the two connecting portions 330 protrude from the main body portion 310 in the X-axis direction and extend in a rectangular shape along the Y-axis direction. In other embodiments, the connecting portion 330 can also protrude from the main body portion 310 in the Y-axis direction, or the connecting portion 330 can also protrude from the main body portion 310 in both the Y-axis direction and the X-axis direction.

[0042] It can be understood that in other embodiments, the number of the connecting portions 330 is not limited to two, and can also be set to three, four, five or other numbers, as long as it is ensured that the multiple connecting portions 330 are evenly distributed within the plane defined by the X-axis and the Y-axis and within the angular range of 360° around the main body portion 310. Or, in other embodiments, the connecting portion 330 can also be annularly connected to the periphery of the main body portion 310 within the plane defined by the X-axis and the Y-axis.

[0043] Combined with Figures 3 to 7 shown, specifically in the present application, the connecting portion 330 is provided with threaded connection holes 331 penetrating in the vertical direction, and after a threaded connecting member (not shown) passes through the threaded connection holes 331, the connecting portion 330 is detachably connected to the test fixture 90. A plurality of threaded connection holes 331 are provided on the connecting portion 330. By passing a plurality of threaded connecting members through the plurality of threaded connection holes 331 one by one and connecting them to the test fixture 90, the stable connection between the connecting portion 330 and the test fixture 90 can be realized. In addition, by screwing in or screwing out the threaded connecting member, the quick disassembly and assembly of the connecting portion 330 and the test fixture 90 can be realized. In other embodiments, other methods such as buckling or pressing can also be used to realize the detachable connection between the connecting portion 330 and the test fixture 90.

[0044] Specifically, two threaded connection holes 331 are provided on the connection part 330. There are a total of four threaded connection holes 331 on the two connection parts 330, and they are all cooperatively connected with M8 threaded connectors. In this application, the four threaded connection holes 331 are distributed in a rectangular shape, and the force application center where the main body part 310 abuts against the battery cell group 100 corresponds to the center position of the rectangle formed by the four threaded connection holes 331. In this way, after the end plate 300 is connected to the test fixture 90, it can ensure that the vertically placed battery cell group 100 is stably supported between the two end plates 300, avoiding the problem of the battery cell group 100 being displaced due to force during testing and tipping over.

[0045] Combined Figures 3 to 7 As shown, in the embodiment of this application, the end plate 300 includes a first reinforcing rib 340. The first reinforcing rib 340 is located on the side of the connection part 330 facing the battery cell group 100 and connects the connection part 330 and the main body part 310. By providing the first reinforcing rib 340, the connection strength between the connection part 330 and the main body part 310 can be improved. Specifically, the first reinforcing rib 340 includes a plurality of rib strips, and the plurality of rib strips are arranged in parallel at intervals. Further, a side opening 311 is provided at the position of the main body part 310 corresponding to the first reinforcing rib 340. The side opening 311 extends along the arrangement direction of the plurality of rib strips and penetrates through the plurality of rib strips. In this way, when the end plate 300 is formed by casting, the setting of the side opening 311 can increase the fluidity of the material, realizing the smooth forming of the structure at the connection of the main body part 310, the first reinforcing rib 340 and the connection part 330. In addition, the side opening 311 can also be used for hoisting and positioning.

[0046] For the force application surface 32 on the end plate 300, its first fitting surface 312 and second fitting surface 332 are arranged at intervals. In this way, the force application surface 32 of the end plate 300 fits with the test fixture 90 in multiple spaced areas, improving the fitting smoothness between the end plate 300 and the test fixture 90.

[0047] Specifically, the first fitting surface 312 and the second fitting surface 332 are arranged on the same plane. Such a setting can obtain the first fitting surface 312 and the second fitting surface 332 at one time through synchronous casting or synchronous cutting, etc., so that the formation process of the first fitting surface 312 and the second fitting surface 332 is relatively simple, and it is easier to improve the coplanarity accuracy of the two. In this application, the plane where the first fitting surface 312 and the second fitting surface 332 are located is the plane on the end plate 300 that is farthest from the battery cell group 100. Thus, the first fitting surface 312 and the second fitting surface 332 can stably fit with the test fixture 90 without being interfered by any other structures on the end plate 300.

[0048] Specifically, both the first fitting surfaces 312 and the second fitting surfaces 332 are multiple. In this way, the multiple first fitting surfaces 312 and the multiple second fitting surfaces 332 can all be fitted to the test fixture 90, so that multiple positions of the end plate 300 can be fitted to the test fixture 90, which helps to achieve a stable connection between the end plate 300 and the test fixture 90 and avoid the end plate 300 from shaking relative to the test fixture 90. In this application, all the surfaces of the connecting portion 330 facing the test fixture 90 are the second fitting surfaces 332. The two connecting portions 330 provide two second fitting surfaces 332 with larger areas on both sides of the main body portion 310, while the multiple first fitting surfaces 312 on the main body portion 310 are smaller in area and are spaced between the two second fitting surfaces 332.

[0049] As Figures 2 to 5 shown, in the embodiment of this application, a plurality of positioning posts 313 are formed at intervals on the side of the main body portion 310 facing away from the battery cell group 100. The positioning posts 313 are provided with positioning holes 314, and the end faces of the positioning posts 313 constitute the first fitting surfaces 312. In this way, the positioning posts 313 and the positioning holes 314 can serve as positioning structures when the end plate 300 is connected to the test fixture 90 to play a positioning role. At the same time, the end faces of the positioning posts 313 can also be used to obtain the first fitting surfaces 312. In this application, there are four positioning posts 313, so there are four first fitting surfaces 312. The four first fitting surfaces 312 are spaced apart to jointly cooperate to achieve a stable fit between the main body portion 310 and the test fixture 90, avoid the main body portion 310 from shaking relative to the test fixture 90, and thus achieve a stable abutment between the main body portion 310 and the battery cell group 100.

[0050] Specifically, the inner diameter of the positioning hole 314 is 10 mm. The positioning post 313 is cylindrical, and the difference between its outer diameter and the inner diameter of the positioning hole 314 is 4 mm. In this way, on the premise of ensuring the structural strength of the positioning post 313, a larger inner diameter can be given to the positioning hole 314, which is beneficial to the positioning operation through the positioning hole 314 and is also convenient for the positioning hole 314 to be used for hoisting.

[0051] On the side of the main body portion 310 facing away from the battery cell group 100, a second reinforcing rib 315 is formed. The second reinforcing rib 315 is connected to a plurality of positioning posts 313 and is arranged in a "rice" shape. It can be understood that the second reinforcing rib 315 includes a plurality of rib strips, and the plurality of rib strips are connected to each other in a "rice" shape layout. On the side of the main body portion 310 facing away from the battery cell group 100, there are a plurality of recessed areas, and any two adjacent recessed areas are separated by a rib strip, so that the second reinforcing rib 315 divides the plurality of recessed areas from each other. With such a setting, the main body portion 310 can maintain a relatively high structural strength while consuming less material and having a relatively small weight. Further, the positioning posts 313 are arranged at the joints of the plurality of rib strips. Under the supporting action of the plurality of rib strips, the positioning posts 313 are not easily deformed and the end faces can be smoothly attached to the test fixture 90.

[0052] As Figure 7 shown, specifically in the embodiment of the present application, an overflow groove 316 is opened at a position on the abutting surface 31 corresponding to the periphery of the battery cell group 100. Specifically, the abutting surface 31 is a flat surface, which can be smoothly abutted against the battery cell group 100. When the battery cell group 100 is under extrusion, the glue applied during the assembly process of the battery cell group 100 will overflow, and the overflow groove 316 can collect the overflowed glue, thereby preventing the glue from overflowing and affecting the appearance of the battery cell group 100. Specifically, the overflow groove 316 extends in a ring shape to exactly correspond to the periphery of the battery cell group 100.

[0053] Combined with Figure 4 shown, in the present application, the main body portion 310 has a side surface 317 connected between the abutting surface 31 and the first fitting surface 312, and a threaded hole 318 through which a threaded connecting member can pass is formed in the side surface 317. By providing the threaded hole 318 penetrating the main body portion 310 in the side surface 317, an external threaded connecting member can pass through the threaded hole 318 and connect the end plate 300 to the base in the conventional fixing manner of the battery cell group 100. Thus, the end plate 300 and the base can cooperate to fix the battery cell group 100 in a lying posture to meet the requirement of the expansion force test in the lying posture. In this way, the end plate 300 can be used for the tests of the standing posture and the lying posture of the battery cell group 100 and has high environmental applicability.

[0054] In the present application, a first mounting position 319a and a second mounting position 319b are provided on the side surface 317 of the main body portion 310. The first mounting position 319a is configured to mount an insulating block, and the second mounting position 319b is configured to mount a communication terminal. In the present application, both the first mounting position 319a and the second mounting position 319b are provided on one side of the main body portion 310 in the Y-axis direction and present a concave groove-like structure. Thus, after the insulating block in the battery module 20 is mounted in the first mounting position 319a, the side walls surrounding the first mounting position 319a can limit the insulating block, and the insulating block can be stably accommodated in the first mounting position 319a. Similarly, after the communication terminal in the battery module 20 is mounted in the second mounting position 319b, the side walls surrounding the second mounting position 319b can limit the communication terminal, and the communication terminal can be stably accommodated in the second mounting position 319b. Further, the first mounting position 319a and the second mounting position 319b are spaced apart in the X-axis direction so as not to interfere with each other. In other embodiments, the main body portion 310 may further be provided with more mounting positions to be able to accommodate other structural components in the battery module 20 that need to be accommodated.

[0055] In the present application, for the strap 500 in the battery module 20, after the strap 500 binds the battery cell group 100 and the two end plates 300, the two end plates 300 can stably abut against the opposite side surfaces 317 of the battery cell group 100 in the vertical direction, and the strap 500, the battery cell group 100, and the end plates 300 form a stable whole. Thus, when the battery cells are in the vertical placement posture, the entire battery module 20 can be stably supported in the vertical direction through the force-bearing surface 32, that is, the test fixture 90 can provide stable support for the whole battery module 20 by fitting with the force-bearing surface 32 of the end plate 300.

[0056] Combined Figures 2 to 6 As shown, specifically, a card slot 350 is formed on the end plate 300, and the card slot 350 is configured to accommodate the strap 500. It can be understood that a part of the strap 500 wound around the end plate 300 is accommodated in the card slot 350, that is, when the strap 500 winds around to the end plate 300, it can be placed in the card slot 350. Thus, the side walls surrounding the card slot 350 can limit the strap 500 in the card slot 350 to prevent the strap 500 from falling off relative to the end plate 300. At the same time, the setting of the card slot 350 can also facilitate the installation of the strap 500.

[0057] In the present application, a lug 360 is provided on the main body portion 310 at a position adjacent to the connecting portion 330, and there is a gap between the lug 360 and the connecting portion 330, and this gap forms the card slot 350 for accommodating the strap 500. Further, the height of the lug 360 protruding above the main body portion 310 is 3 mm, which can effectively limit the strap 500 in the card slot 350.

[0058] In the present application, there are multiple straps 500, and the multiple straps 500 are arranged in parallel at intervals. As Figure 2 shown in Figure 3 , there are two straps 500, and the two straps 500 are arranged in parallel at intervals in the Y-axis direction to cooperate together to realize the pressing of the two end plates 300 on the battery cell group 100. Further, the two straps 500 are respectively located on both sides of the connecting portion 330 in the Y-axis direction, so that the connecting portion 330 is located between the two straps 500. In other embodiments, the number of straps 500 can also be set to three, four or other numbers according to needs.

[0059] Specifically in the present application, the end plate 300 is an integrally formed structure. It can be understood that the end plate 300 can be obtained by one-time forming through casting, injection, etc. The end plate 300 as a whole can have relatively strong structural strength, and complex assembly operations can be avoided.

[0060] Combined with Figure 1 shown in Figure 2 , the present application further includes a battery module expansion force test system 10, which includes a test fixture 90 and the above-mentioned battery module 20. Among them, the test fixture 90 includes two clamping plates 910, and the two clamping plates 910 are arranged at intervals in the vertical direction and the distance therebetween is variable. In the battery module 20, the two end plates 300 are detachably connected to the two clamping plates 910 in one-to-one correspondence. Among the two end plates 300, the end plate 300 at the lower position in the vertical direction supports the battery cell group 100.

[0061] In the battery module expansion force test system 10, after the battery module 20 is placed between the two clamping plates 910 with its battery cell group 100 in a vertical placement posture, and the two end plates 300 are connected to the two clamping plates 910 arranged at intervals in the vertical direction in one-to-one correspondence, the battery module 20 can be stably supported between the two clamping plates 910. After the size of the battery cell group 100 in the battery module 20 changes due to expansion in the vertical direction, the two clamping plates 910 are squeezed and the distance therebetween changes. By obtaining the squeezing force received by the two clamping plates 910, the information related to the expansion force of the battery module 20 can be obtained.

[0062] Compared with the prior art, in the battery module expansion force test system 10 of the present application, the two end plates 300 can abut against the opposite sides of the battery cell groups 100 with different sizes, and provide stable support for the battery cell group 100 by connecting with the two clamping plates 910 in the vertical direction. In this way, the cooperation between the two end plates 300 and the two clamping plates 910 can be applicable to the test requirements of battery cell groups 100 of various sizes, and can also meet the requirements of the vertical placement test of the battery cell group 100.

[0063] For the test fixture 90, it further includes a guide rod 920, a bottom plate 930, an adjusting member 940, a pressure sensor (not shown), a displacement sensor (not shown), an elastic member 950, a vertical placement base 960, and a limiting member 970. One end of the guide rod 920 is connected to the bottom plate 930, and both clamping plates 910 are slidably arranged on the guide rod 920. The adjusting member 940 is connected to the clamping plate 910 at a higher position in the vertical direction and can drive the clamping plate 910 to slide along the guide rod 920. The pressure sensor is arranged between the clamping plate 910 at a higher position and the adjusting member 940 to be able to detect the pressure between the adjusting member 940 and the clamping plate 910 at a higher position. The displacement sensor is arranged between the bottom plate 930 and the clamping plate 910 at a lower position to be able to detect the displacement of the clamping plate 910 at a lower position sliding along the guide rod 920. The limiting member 970 has a first state of being supported between the bottom plate 930 and the clamping plate 910 at a lower position and a second state of not being supported between the two. The elastic member 950 is arranged between the bottom plate 930 and the clamping plate 910 at a lower position and elastically acts on the clamping plate 910 at a lower position when the limiting member 970 is in the second state, and fails when the limiting member 970 is in the first state. When the limiting member 970 is in the first state, it can meet the test use of the battery module 20 in the non-displacement test mode, and when the limiting member 970 is in the second state, it can meet the test use of the battery module 20 in the displacement test mode. The vertical placement base 960 is connected to the bottom plate 930 to support other structures in the test fixture 90 and the battery module 20 located between the two clamping plates 910.

[0064] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An end plate of a battery module, characterized in that: The end plate is provided with abutment surfaces and force-bearing surfaces on both sides along the thickness direction, respectively. The abutment surfaces are arranged parallel to the force-bearing surfaces, the abutment surfaces can abut against the battery cell group, and the force-bearing surfaces can be tightly attached to the test fixture; at least part of the force-bearing surface is located outside the abutment surface, and the part of the end plate where it is located is detachably connected to the test fixture.

2. The end plate of the battery module according to claim 1, characterized in that: The end plate includes a main body and a connecting part, the connecting part is fixedly connected to the main body and protrudes from the main body, the abutting surface is located on the main body, the main body has a first fitting surface on the side away from the abutting surface, the connecting part has a second fitting surface, and the first fitting surface and the second fitting surface together constitute the force-bearing surface.

3. The end plate of the battery module according to claim 2, characterized in that: The first bonding surface and the second bonding surface are spaced apart from each other; and / or, the first bonding surface and the second bonding surface are coplanarly arranged; and / or, the first bonding surface and the second bonding surface are both plural.

4. The end plate of the battery module according to claim 2, characterized in that: A plurality of positioning posts are formed at intervals on a side of the main body away from the battery cell group, the positioning posts are provided with positioning holes, and the end faces of the positioning posts constitute the first fitting surface; a second reinforcing rib is formed on a side of the main body away from the battery cell group, the second reinforcing rib is connected to the plurality of positioning posts and arranged in a "M" shape.

5. The end plate of the battery module according to claim 2, characterized in that: A glue overflow groove is provided on the abutting surface at a position corresponding to the periphery of the battery cell group; and / or, the main body has a side surface connected between the abutting surface and the first fitting surface, and a threaded hole is provided through the side surface to allow a threaded connector to pass through; and / or, the main body has a side surface connected between the abutting surface and the first fitting surface, and the side surface is provided with a first mounting position and a second mounting position, the first mounting position is configured to install an insulating block, and the second mounting position is configured to install a communication terminal.

6. The end plate of the battery module according to claim 2, characterized in that: There are two connecting parts, and the two connecting parts are connected to opposite sides of the main body; and / or the end plate includes a first reinforcing rib, which is located on a side of the connecting part facing the battery cell group and connects the connecting part and the main body.

7. The end plate of the battery module according to claim 1, characterized in that: A slot is formed on the end plate and is configured to accommodate a binding strap.

8. The end plate of the battery module according to any one of claims 1 to 7, characterized in that: The end plate is an integrally formed structure.

9. A battery module, characterized in that: include: Battery cell group; The end plate according to any one of claims 1 to 8, wherein there are two end plates, and the abutting surfaces of the two end plates abut against opposite sides of the battery cell group respectively; and A binding belt is wound around the battery cell group and the two end plates to bind the battery cell group and the two end plates.

10. An expansion force testing system, characterized in that: include: A test fixture, comprising two clamping plates, the two clamping plates are spaced apart in a vertical direction and the spacing between the two clamping plates is variable; and The battery module described in claim 9, in which the two end plates are detachably connected to the two clamping plates in a one-to-one correspondence; among the two end plates, the end plate in a lower position in the vertical direction supports the battery cell group.

Images