Battery module expansive force test clamp

Abstract

The utility model provides a battery module expansive force test fixture, which comprises a test assembly and a limiting piece, and is characterized in that the test assembly comprises a guide rod, a first end plate, a second end plate, a third end plate, an adjusting piece, a pressure sensor, a displacement sensor and an elastic piece; a clamping space for clamping the battery module is formed between the second end plate and the third end plate; the limiting piece has a first state in which the limiting piece is supported between the first end plate and the second end plate and a second state in which the limiting piece is not supported between the first end plate and the second end plate; the elastic piece is arranged between the first end plate and the second end plate, elastically acts on the second end plate when the limiting piece is in the second state, and loses efficacy when the limiting piece is in the first state. According to the battery module expansion force test fixture, the use of a displacement-free test is met when the limiting piece is in the first state, and the use of a displacement test is met when the limiting piece is in the second state, so that the switching of two test modes can be realized by switching the limiting piece between the first state and the second state.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing equipment, and more specifically, to a battery module expansion force testing fixture. Background Art

[0002] During the production of lithium-ion batteries, the expansion force of a battery module consisting of one or more cells increases with the number of charging cycles. Therefore, expansion force testing is a key factor in evaluating whether the battery module structure is safe.

[0003] At present, there are usually two test modes for expansion force testing of battery modules: one test mode is to clamp the battery module through the test fixture, and perform displacement and expansion force tests when the battery module is displaced, that is, the displacement test mode; the other test mode is to clamp the battery module through the test fixture, and perform expansion force tests when the battery module is not displaced, that is, the non-displacement test mode. Conventional test fixtures can only meet the test use of battery modules in a single test mode, but cannot meet the test use of battery modules in two test modes. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery module expansion force testing fixture to solve the technical problem existing in the related art that the requirements for the use of two test modes of the battery module cannot be met.

[0005] The present application provides a battery module expansion force testing fixture, comprising:

[0006] A test assembly, comprising a guide rod, a first end plate, a second end plate, a third end plate, an adjusting member, a pressure sensor, a displacement sensor and an elastic member; one end of the guide rod is connected to the first end plate, the second end plate and the third end plate are both slidably arranged on the guide rod, the second end plate is located between the first end plate and the third end plate, and a clamping space for clamping a battery module is formed between the second end plate and the third end plate; the adjusting member is connected to the third end plate and can drive the third end plate to slide along the guide rod; the pressure sensor is arranged between the adjusting member and the third end plate to detect the pressure between the adjusting member and the third end plate; the displacement sensor is arranged between the first end plate and the second end plate to detect the displacement of the second end plate sliding along the guide rod; and

[0007] A limit member, wherein the limit member has a first state in which it is supported between the first end plate and the second end plate, and a second state in which it is not supported between the first end plate and the second end plate; the elastic member is arranged between the first end plate and the second end plate, and elastically acts on the second end plate when the limit member is in the second state, and fails when the limit member is in the first state.

[0008] In one embodiment, a limiting groove is provided on a side of the second end plate facing the first end plate; when the limiting member is in the first state, one end thereof abuts against the first end plate, and the other end matches the limiting groove and abuts against the second end plate in the limiting groove.

[0009] In one of the embodiments, there are multiple guide rods, which are arranged at intervals and distributed around the battery module when the battery module is accommodated in the clamping space; the elastic member is a spring, and there are multiple elastic members, which are correspondingly mounted on the multiple guide rods.

[0010] In one embodiment, the adjusting member includes a fourth end plate, a fifth end plate and a lead screw, the fourth end plate is fixedly connected to an end of the guide rod away from the first end plate, the fifth end plate is located between the third end plate and the fourth end plate, and is slidably arranged on the guide rod, the lead screw passes through the fourth end plate and is threadedly connected to the fourth end plate, one end of the lead screw is rotatably connected to the fifth end plate and can drive the fifth end plate to slide relative to the guide rod; the pressure sensor is fixed to the side of the fifth end plate facing the third end plate.

[0011] In one of the embodiments, the adjusting member includes a locking bearing located between the third end plate and the fifth end plate. The locking bearing is sleeved on the guide rod and can move along the guide rod or be fixed relative to the guide rod.

[0012] In one embodiment, the test assembly includes a side plate, and two ends of the side plate are fixedly connected to the first end plate and the fifth end plate respectively.

[0013] In one embodiment, the fourth end plate is provided with two hanging holes; the test assembly includes a hook, the hook is arranged on a side of the fourth end plate away from the fifth end plate, and two ends of the hook are hooked on the two hanging holes one by one.

[0014] In one embodiment, the battery module expansion force testing fixture also includes a standing base, and the first end plate in the test assembly is detachably connected to the standing base; when the first end plate is connected to the standing base, the standing base supports the test assembly along the vertical direction, and the second end plate and the third end plate are spaced apart along the vertical direction.

[0015] In one embodiment, the vertical base includes a base body and a plurality of connecting members, wherein the plurality of connecting members are movably mounted on the base body and can gather together to clamp the first end plate together or move away from each other to release the first end plate.

[0016] In one embodiment, the connecting member includes a first connecting portion and a second connecting portion connected to the first connecting portion, the first connecting portion is connected to the base body, and a plurality of the second connecting portions together form an accommodating space capable of accommodating the first end plate; the base body is provided with a through hole, and the standing base includes a locking member, the locking member passes through the first connecting portion and the through hole, and can lock the first connecting portion to the base body; there are a plurality of through holes, and the plurality of through holes extend in a long strip shape along the direction in which the plurality of connecting members converge together, and the locking member can move along the extension direction of the through hole.

[0017] In the battery module expansion force test fixture provided by the embodiment of the present application, when the limiting member is supported between the first end plate and the second end plate and is in the first state, the second end plate cannot be further approached to the first end plate due to the obstruction of the limiting member, and in the process of driving the third end plate to slide along the guide rod and approach the second end plate through the adjusting member, the third end plate can clamp the battery module located in the clamping space together with the second end plate. In this way, when testing the battery module, the elastic member fails between the first end plate and the second end plate without applying an elastic force to the second end plate, and the spacing between the second end plate and the third end plate remains unchanged, so that the battery module does not move. When the battery module is charged and discharged, the expansion force generated by the battery module will act on the third end plate and then be detected by the pressure sensor. In this way, the battery module expansion force test fixture realizes non-displacement testing of the battery module.

[0018] When the stopper is not supported between the first end plate and the second end plate and is in the second state, the elastic member can apply a variable elastic force to the second end plate between the first end plate and the second end plate as the second end plate slides along the guide rod. In the process of driving the third end plate to slide along the guide rod and approach the second end plate through the adjusting member, the third end plate can clamp the battery module together with the second end plate. At this time, the elastic member applies an elastic force to the second end plate and cooperates with the adjusting member to maintain the clamping of the third end plate and the second end plate on the battery module. When the battery module is charged and discharged, the battery module is deformed under the action of the expansion force, thereby squeezing the third end plate and the second end plate. In this way, the pressure sensor detects the expansion force exerted on the third end plate, and the second end plate squeezes the elastic member and approaches the first end plate. The displacement sensor arranged between the first end plate and the second end plate detects the displacement of the second end plate sliding along the guide rod. In this way, the battery module expansion force test fixture realizes displacement test on the battery module.

[0019] In this way, when the limit member is in the first state, it can meet the test needs of the battery module in the non-displacement test mode, and when the limit member is in the second state, it can meet the test needs of the battery module in the displacement test mode. By adjusting the limit member to switch between the first state and the second state, the test needs of the battery module in the two test modes can be met, thereby improving the applicability of the battery module expansion force test fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A structural schematic diagram of a battery module expansion force testing fixture from one perspective provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 A schematic structural diagram of the battery module expansion force test fixture from another perspective;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the battery module expansion force test fixture when the limiter is in the second state;

[0024] Figure 4 for Figure 1 Schematic diagram of the explosion of the battery module expansion force test fixture from one perspective;

[0025] Figure 5 for Figure 4 A structural schematic diagram of a second end plate from one perspective in a battery module expansion force testing fixture shown in ;

[0026] Figure 6 for Figure 4 A schematic diagram of the connection structure between the fourth end plate, the hook and the lead screw in the battery module expansion force test fixture shown;

[0027] Figure 7 for Figure 4 The structural schematic diagram of the battery module expansion force test fixture shown is a one-view structural diagram of the neutral base;

[0028] Figure 8 for Figure 7 A structural schematic diagram of the vertical base from another perspective;

[0029] Among them, the reference numerals in the figure are:

[0030] 10. Battery module expansion force test fixture; 100. Test assembly; 110. Guide rod; 120. First end plate; 130. Second end plate; 131. Screw hole; 132. Limiting groove; 140. Third end plate; 150. Adjustment member; 151. Fourth end plate; 151a. Lifting hole; 152. Fifth end plate; 153. Lead screw; 154. Handle; 155. Locking bearing; 160. Pressure sensor Sensor; 170, displacement sensor; 180, elastic member; 190, clamping space; 210, side panel; 220, hook; 300, limit member; 500, standing base; 510, base body; 511, through hole; 512, support plate; 513, support leg; 520, connecting member; 521, first connecting part; 522, second connecting part; 530, locking member; 531, bolt; 532, nut. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] 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.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] Please also read Figures 1 to 8 , the battery module expansion force test fixture 10 provided in the embodiment of the present application is now described. The battery module expansion force test fixture 10 includes a test assembly 100 and a limiter 300. Among them, the test assembly 100 includes a guide rod 110, a first end plate 120, a second end plate 130, a third end plate 140, an adjustment member 150, a pressure sensor 160, a displacement sensor 170 and an elastic member 180. One end of the guide rod 110 is connected to the first end plate 120, and the second end plate 130 and the third end plate 140 are both slidably arranged on the guide rod 110, and the second end plate 130 is located between the first end plate 120 and the third end plate 140, and a clamping space 190 for clamping the battery module is formed between the second end plate 130 and the third end plate 140. The adjustment member 150 is connected to the third end plate 140 and can drive the third end plate 140 to slide along the guide rod 110. The pressure sensor 160 is disposed between the adjusting member 150 and the third end plate 140 to detect the pressure between the adjusting member 150 and the third end plate 140. The displacement sensor 170 is disposed between the first end plate 120 and the second end plate 130 to detect the displacement of the second end plate 130 sliding along the guide rod 110. The stopper 300 has a first state in which it is supported between the first end plate 120 and the second end plate 130 and a second state in which it is not supported between the first end plate 120 and the second end plate 130. The elastic member 180 is disposed between the first end plate 120 and the second end plate 130 and elastically acts on the second end plate 130 when the stopper 300 is in the second state, and fails when the stopper 300 is in the first state.

[0036] It can be understood that when the stopper 300 is supported between the first end plate 120 and the second end plate 130 and is in the first state (eg Figure 4As shown in the figure, the second end plate 130 cannot be further approached to the first end plate 120 due to the obstruction of the limiter 300. In the process of driving the third end plate 140 to slide along the guide rod 110 and approach the second end plate 130 through the adjusting member 150, the third end plate 140 can clamp the battery module located in the clamping space 190 together with the second end plate 130. In this way, when testing the battery module, the elastic member 180 fails to apply elastic force to the second end plate 130 and fails between the first end plate 120 and the second end plate 130. The distance between the second end plate 130 and the third end plate 140 remains unchanged, so that the battery module does not move. When the battery module is charged and discharged, the expansion force generated by the battery module will act on the third end plate 140, and then be detected by the pressure sensor 160. In this way, the battery module expansion force test fixture 10 realizes non-displacement testing of the battery module.

[0037] It can be understood that when the stopper 300 is not supported between the first end plate 120 and the second end plate 130 and is in the second state (eg Figure 3 As shown in FIG. 1 , the elastic member 180 between the first end plate 120 and the second end plate 130 can apply a variable elastic force to the second end plate 130 as the second end plate 130 slides along the guide rod 110. In the process of the third end plate 140 being driven by the adjusting member 150 to slide along the guide rod 110 and approaching the second end plate 130, the third end plate 140 can clamp the battery module located in the clamping space 190 together with the second end plate 130. At this time, the elastic member 180 applies an elastic force to the second end plate 130 and cooperates with the adjusting member 150 to maintain the clamping of the third end plate 140 and the second end plate 130 on the battery module. When the battery module is charged and discharged, the battery module is deformed under the action of the expansion force, thereby squeezing the third end plate 140 and the second end plate 130. In this way, the pressure sensor 160 detects the expansion force exerted on the third end plate 140, and the second end plate 130 squeezes the elastic member 180 and approaches the first end plate 120. The displacement sensor 170 disposed between the first end plate 120 and the second end plate 130 detects the displacement of the second end plate 130 sliding along the guide rod 110. In this way, the battery module expansion force test fixture 10 realizes displacement testing of the battery module.

[0038] The above-mentioned battery module expansion force test fixture 10 can meet the test needs of the battery module in a non-displacement test mode when the limit member 300 is in the first state, and can meet the test needs of the battery module in a displacement test mode when the limit member 300 is in the second state. In this way, by adjusting the limit member 300 to switch between the first state and the second state, the test needs of the battery module in the two test modes can be met, thereby improving the applicability of the battery module expansion force test fixture 10.

[0039] Combination Figures 3 to 5 As shown, in the present application, screw holes 131 are provided on the second end plate 130 and the third end plate 140. After the battery module is clamped by the second end plate 130 and the third end plate 140 before testing, the battery module and the second end plate 130, and the battery module and the third end plate 140 can be stably connected through the cooperation of the screws and the screw holes 131, thereby ensuring that the battery module is stably confined between the second end plate 130 and the third end plate 140, and the displacement of the battery membrane group during expansion is directly reflected by the displacement of the second end plate 130.

[0040] Specifically, in the embodiment of the present application, a limiting groove 132 is provided on one side of the second end plate 130 facing the first end plate 120. When the limiting member 300 is in the first state, one end thereof abuts against the first end plate 120, and the other end matches the limiting groove 132 and abuts against the second end plate 130 in the limiting groove 132. By providing the limiting groove 132 on the second end plate 130, when the limiting member 300 is supported between the first end plate 120 and the second end plate 130, one end thereof is accommodated in the limiting groove 132, and under the limiting effect of the inner wall surface of the limiting groove 132, it cannot move relative to the first end plate 120 and the second end plate 130, and cannot be separated from between the first end plate 120 and the second end plate 130.

[0041] Specifically, in the present application, the limiting member 300 is in a cubic shape, and after being accommodated in the limiting groove 132, the outer wall surface of one end thereof can be closely attached to the inner wall surface of the limiting groove 132, so that the limiting groove 132 plays a limiting role on the limiting member 300. For the limiting groove 132, its groove depth can be set to 5mm to 10mm.

[0042] It should be noted that, in other embodiments, the limiting groove 132 may be provided on the side of the first end plate 120 facing the second end plate 130, and in this case, one end of the limiting member 300 abuts against the first end plate 120 in the limiting groove 132. Alternatively, in other embodiments, the limiting groove 132 may be provided on the side of the first end plate 120 facing the second end plate 130 and on the side of the second end plate 130 facing the first end plate 120, and in this case, the two ends of the limiting member 300 are respectively accommodated in the limiting grooves 132 of the two end plates and abut against the two end plates.

[0043] Combination Figure 3 and Figure 4 As shown, in the present application, there are multiple guide rods 110, which are arranged at intervals and distributed around the battery module when the battery module is accommodated in the clamping space 190. The elastic member 180 is a spring, and there are multiple elastic members 180, which are sleeved on the multiple guide rods 110 one by one.

[0044] It can be understood that the plurality of guide rods 110 are arranged in parallel, and the plurality of guide rods 110 are all passed through the second end plate 130 and the third end plate 140, so that the plurality of guide rods 110 can play a guiding role for the second end plate 130 and the third end plate 140, and the plurality of guide rods 110 cooperate with each other to ensure the smooth sliding of the second end plate 130 and the third end plate 140 along the length direction of the guide rods 110, avoiding the problem of being stuck and unable to slide. In addition, when the battery module is accommodated in the clamping space 190 between the second end plate 130 and the third end plate 140, the plurality of guide rods 110 are distributed around the battery module, which can prevent the battery module from escaping from the clamping space 190 without interfering with the second end plate 130 and the third end plate 140 clamping the battery module. Furthermore, since the elastic member 180 is a spring, it can be sleeved on the guide rod 110 so as to be stably maintained between the first end plate 120 and the second end plate 130. The elastic member 180 can be installed between the first end plate 120 and the second end plate 130 without using any other components.

[0045] Specifically, the second end plate 130 and the third end plate 140 are both rectangular flat plate structures, and there are four guide rods 110, which are distributed in a rectangular shape to correspond to the four vertex positions of the second end plate 130 and the third end plate 140. In other embodiments, the number of guide rods 110 and the number of elastic members 180 can also be adjusted as needed. In addition, the elastic member 180 can also be an elastic rubber ring or an elastic cotton pad.

[0046] Combination Figures 2 to 4 As shown, specifically in the embodiment of the present application, the adjusting member 150 includes a fourth end plate 151, a fifth end plate 152 and a lead screw 153. The fourth end plate 151 is fixedly connected to the end of the guide rod 110 away from the first end plate 120. The fifth end plate 152 is located between the third end plate 140 and the fourth end plate 151, and is slidably arranged on the guide rod 110. The lead screw 153 passes through the fourth end plate 151 and is threadedly connected to the fourth end plate 151. One end of the lead screw 153 is rotatably connected to the fifth end plate 152 and can drive the fifth end plate 152 to slide relative to the guide rod 110. The pressure sensor 160 is fixed to the side of the fifth end plate 152 facing the third end plate 140.

[0047] It can be understood that the fourth end plate 151 is fixed relative to the guide rod 110 and cannot move. Since the lead screw 153 is threadedly connected to the fourth end plate 151, when the lead screw 153 is rotated, the lead screw 153 will move relative to the fourth end plate 151 along the length direction of the guide rod 110, thereby driving the fifth end plate 152 to slide along the guide rod 110. In this way, the fifth end plate 152 will drive the pressure sensor 160 to push the third end plate 140 in the direction toward the second end plate 130, so that the third end plate 140 slides along the guide rod 110 to approach the second end plate 130 and clamp the battery module together with the second end plate 130, and the pressure sensor 160 clamped between the fifth end plate 152 and the third end plate 140 can detect the pressure exerted on the third end plate 140.

[0048] Specifically, the adjusting member 150 includes a handle 154 , which is connected to an end of the lead screw 153 away from the fifth end plate 152 . The lead screw 153 can be easily rotated by providing the handle 154 .

[0049] Specifically, the adjusting member 150 further includes a locking bearing 155 located between the third end plate 140 and the fifth end plate 152. The locking bearing 155 is sleeved on the guide rod 110 and can move along the guide rod 110 or be fixed relative to the guide rod 110. By arranging the locking bearing 155 on the guide rod 110, when the third end plate 140 slides into position along the guide rod 110, the locking bearing 155 can be locked on the guide rod 110 and cannot move relative to the guide rod 110, so as to prevent the third end plate 140 from sliding relative to the guide rod 110 to the side away from the second end plate 130. It should be pointed out that in the process of the fifth end plate 152 pushing the third end plate 140 close to the second end plate 130, the locking bearing 155 can move along the guide rod 110 with the fifth end plate 152 until the third end plate 140 slides into position along the guide rod 110.

[0050] Specifically in the present application, the test assembly 100 includes a side plate 210, and both ends of the side plate 210 are respectively fixedly connected to the first end plate 120 and the fifth end plate 152. It can be understood that when the battery module is placed in the clamping space 190 and is in a lying position, the side plate 210 connected between the first end plate 120 and the second end plate 130 can support the battery module.

[0051] Combination Figure 4 and Figure 6As shown, in the present application, the fourth end plate 151 is provided with two lifting holes 151a. The test assembly 100 includes a hook 220, and the hook 220 is disposed on the side of the fourth end plate 151 away from the fifth end plate 152, and the two ends are hooked on the two lifting holes 151a one by one. It can be understood that the battery module can be in a lying position or a standing position when being tested, and the entire test assembly 100 can be lifted by the hook 220, and the test assembly 100 can be lifted by the hook 220 to change the placement posture of the battery module. It should be pointed out that in the lying position, the side plate 210 supports the battery module in the vertical direction, and in the standing position, the second end plate 130 supports the battery module in the vertical direction (i.e. Figure 4 The test assembly 100 supports the battery module in the Z-axis direction, and when the battery module is tested in a vertical position, the test assembly 100 needs to be used in conjunction with the vertical base 500.

[0052] Specifically, the two lifting holes 151a extend in a long strip shape. After the hook 220 is hooked in the lifting hole 151a, when the test component 100 is lifted by the hook 220, the position of the hook 220 in the lifting hole 151a can be adjusted along the extension direction of the lifting hole 151a to avoid the test component 100 from being skewed during the lifting process.

[0053] Combination Figure 4 , Figure 7 and Figure 8 As shown, in the present application, the battery module expansion force test fixture 10 also includes a standing base 500, and the first end plate 120 in the test assembly 100 is detachably connected to the standing base 500. When the first end plate 120 is connected to the standing base 500, the standing base 500 supports the test assembly 100 in the vertical direction, and the second end plate 130 and the third end plate 140 are arranged at intervals in the vertical direction. It can be understood that after the test assembly 100 is connected to the standing base 500, the standing base 500 can stably support the test assembly 100 and the battery module in the vertical direction, so that the battery module can be tested in a standing posture, and after the test assembly 100 is separated from the standing base 500, the test assembly 100 can test the battery module in a lying posture. In this way, through the detachable connection between the test assembly 100 and the standing base 500, the battery module expansion force test fixture 10 can simultaneously meet the needs of standing test and lying test of the battery module.

[0054] Specifically, the stand-up base 500 includes a base body 510 and a plurality of connectors 520, wherein the plurality of connectors 520 are movably mounted on the base body 510 and can gather together to clamp the first end plate 120 together or move away from each other to release the first end plate 120. It can be understood that after the first end plate 120 is placed on the base body 510, the plurality of connectors 520 gather together to hold the first end plate 120, thereby fixing the first end plate 120 on the base body 510, so that the base body 510 stably supports the test assembly 100 in the vertical direction. When the plurality of connectors 520 move away from each other, the first end plate 120 can be loosened, so that the first end plate 120 is released and can be separated from the base body 510. In addition, the plurality of connectors 520 can be adapted to hold first end plates 120 of various sizes, so that the stand-up base 500 has strong applicability.

[0055] Further, the connecting member 520 includes a first connecting portion 521 and a second connecting portion 522 connected to the first connecting portion 521, the first connecting portion 521 is connected to the base body 510, and the plurality of second connecting portions 522 together enclose an accommodation space capable of accommodating the first end plate 120. The base body 510 is provided with a through hole 511, and the stand-up base 500 includes a locking member 530, which penetrates the first connecting portion 521 and the through hole 511 and can lock the first connecting portion 521 to the base body 510. There are a plurality of through holes 511, and the plurality of through holes 511 extend in a long strip shape along the direction in which the plurality of connecting members 520 gather together, and the locking member 530 can move along the extending direction of the through hole 511.

[0056] It can be understood that the locking member 530 can drive the connecting member 520 to change its position along the extending direction of the through hole 511, thereby changing the position of the connecting member 520 relative to the base 510. When the connecting member 520 moves to the right position relative to the base 510, the locking member 530 can lock the connecting member 520 and the base 510 so that the two cannot move relative to each other. When the relative position of the connecting member 520 and the base 510 needs to be changed, the connecting member 520 and the base 510 can be unlocked by the locking member 530. In addition, during the movement of the locking member 530 along the extending direction of the through hole 511, the through hole 511 guides the locking member 530, thereby limiting the movement direction of the connecting member 520 relative to the base 510, so that multiple connecting members 520 can move relative to the base 510 in a manner of gathering together and moving away from each other.

[0057] Combination Figure 4 , Figure 7 and Figure 8As shown, specifically in the present application, the locking member 530 includes a bolt 531 and a nut 532. The bolt 531 passes through the first connection portion 521 and then passes through the through hole 511. The nut 532 is threadedly connected to the bolt 531, and when the bolt 531 moves into position along the through hole 511, it clamps the first connection portion 521 and the seat body 510 together with the bolt 531. Specifically, for one connection member 520, two through holes 511 and two locking members 530 are correspondingly provided. Specifically, the first end plate 120 is a rectangular flat plate structure, and the number of the connection members 520 is four, and the four connection members 520 are distributed in a rectangular shape to respectively hold the four sides of the first end plate 120.

[0058] The seat body 510 includes a support plate 512 and a plurality of support legs 513 connected to the support plate 512 . The support plate 512 is stably supported by the support legs 513 . The connecting member 520 is connected to the support plate 512 to lock the first end plate 120 on the support plate 512 .

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery module expansion force testing fixture, characterized in that: include: A test assembly, comprising a guide rod, a first end plate, a second end plate, a third end plate, an adjusting member, a pressure sensor, a displacement sensor and an elastic member; one end of the guide rod is connected to the first end plate, the second end plate and the third end plate are both slidably arranged on the guide rod, the second end plate is located between the first end plate and the third end plate, and a clamping space for clamping a battery module is formed between the second end plate and the third end plate; the adjusting member is connected to the third end plate and can drive the third end plate to slide along the guide rod; the pressure sensor is arranged between the adjusting member and the third end plate to detect the pressure between the adjusting member and the third end plate; the displacement sensor is arranged between the first end plate and the second end plate to detect the displacement of the second end plate sliding along the guide rod; and A limit member, wherein the limit member has a first state in which it is supported between the first end plate and the second end plate, and a second state in which it is not supported between the first end plate and the second end plate; the elastic member is arranged between the first end plate and the second end plate, and elastically acts on the second end plate when the limit member is in the second state, and fails when the limit member is in the first state.

2. The battery module expansion force testing fixture according to claim 1, characterized in that: A limiting groove is provided on one side of the second end plate facing the first end plate; when the limiting member is in the first state, one end thereof abuts against the first end plate, and the other end matches the limiting groove and abuts against the second end plate in the limiting groove.

3. The battery module expansion force testing fixture according to claim 1, characterized in that: There are multiple guide rods, which are arranged at intervals and distributed around the battery module when the battery module is accommodated in the clamping space; the elastic member is a spring, and there are multiple elastic members, which are sleeved on the multiple guide rods in a one-to-one correspondence.

4. The battery module expansion force testing fixture according to claim 1, characterized in that: The adjusting member includes a fourth end plate, a fifth end plate and a lead screw, the fourth end plate is fixedly connected to an end of the guide rod away from the first end plate, the fifth end plate is located between the third end plate and the fourth end plate, and is slidably arranged on the guide rod, the lead screw passes through the fourth end plate and is threadedly connected to the fourth end plate, one end of the lead screw is rotatably connected to the fifth end plate, and can drive the fifth end plate to slide relative to the guide rod; the pressure sensor is fixed to the side of the fifth end plate facing the third end plate.

5. The battery module expansion force testing fixture according to claim 4, characterized in that: The adjusting member comprises a locking bearing located between the third end plate and the fifth end plate. The locking bearing is sleeved on the guide rod and can move along the guide rod or be fixed relative to the guide rod.

6. The battery module expansion force testing fixture according to claim 4, characterized in that: The test assembly includes a side plate, and two ends of the side plate are fixedly connected to the first end plate and the fifth end plate respectively.

7. The battery module expansion force testing fixture according to claim 4, characterized in that: The fourth end plate is provided with two hanging holes; the testing assembly comprises a hook, the hook is arranged on a side of the fourth end plate away from the fifth end plate, and two ends of the hook are hooked on the two hanging holes in a one-to-one correspondence.

8. The battery module expansion force testing fixture according to any one of claims 1 to 7, characterized in that: The battery module expansion force testing fixture also includes a standing base, and the first end plate in the test assembly is detachably connected to the standing base; when the first end plate is connected to the standing base, the standing base supports the test assembly in a vertical direction, and the second end plate and the third end plate are spaced apart in the vertical direction.

9. The battery module expansion force testing fixture according to claim 8, characterized in that: The vertical base includes a base body and a plurality of connecting members, wherein the plurality of connecting members are movably mounted on the base body and can gather together to clamp the first end plate together or move away from each other to release the first end plate.

10. The battery module expansion force testing fixture according to claim 9, characterized in that: The connecting member includes a first connecting portion and a second connecting portion connected to the first connecting portion, the first connecting portion is connected to the base body, and a plurality of the second connecting portions together form an accommodating space capable of accommodating the first end plate; the base body is provided with a through hole, and the standing base includes a locking member, the locking member passes through the first connecting portion and the through hole, and can lock the first connecting portion to the base body; there are a plurality of through holes, and the plurality of through holes extend in a long strip shape along the direction in which the plurality of connecting members gather together, and the locking member can move along the extension direction of the through hole.

Images