Device for detecting expansion of battery cell

Abstract

The utility model relates to the field of battery cell expansion detection, in particular to a device for battery cell expansion detection, which comprises a top plate, a bottom plate, a plane clamping plate and a plurality of rod bodies, one end of each rod body is connected with the top plate, and the other end of each rod body is connected with the bottom plate; the planar clamping plate is located between the bottom plate and the top plate, the rod body penetrates through the planar clamping plate, the planar clamping plate is slidably connected with the rod body, and the planar clamping plate and the bottom plate can clamp a battery cell; the top plate is provided with a pushing device, the pushing device is provided with a force measuring device, and the force measuring device can abut against the plane clamping plate. A plurality of displacement measuring devices are arranged on the bottom plate and can be propped against the battery cells; by measuring the expansion displacement of a plurality of positions of the battery cell, the problem that the expansion displacement data of the battery cell is single is solved; an expansion force test and an expansion displacement test can be carried out on a device for battery cell expansion detection, and the problems that an existing clamp is large in measurement error and poor in consistency are solved; and various complex test conditions of the cell expansion test can be met.

Description

Technical Field

[0001] The utility model relates to the field of battery core expansion detection, in particular to a device for battery core expansion detection. Background Art

[0002] The expansion detection of battery cells includes battery cell expansion force detection and battery cell expansion displacement detection. Battery cell expansion displacement is the key consideration and concern in actual design. In order to better improve product design in the R&D stage and control battery cell expansion, it is necessary to monitor the expansion displacement of the battery cell under different cycle numbers.

[0003] However, existing battery cell expansion test tools are mainly used to monitor expansion force. To detect battery cell expansion displacement, different test devices need to be replaced for detection. In the process of studying battery cell expansion, the test conditions are complex and diverse and will change as the test progresses. Replacing different detection devices will inevitably cause large errors in the battery cell expansion detection results, resulting in inaccurate test results.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problem that expansion force detection and expansion displacement detection cannot be performed under the same device during expansion detection of battery cells. Utility Model Content

[0005] The purpose of the utility model is to provide a device for battery cell expansion detection to solve the technical problem that expansion force detection and expansion displacement detection cannot be performed under the same device during battery cell expansion detection.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for detecting battery cell expansion, comprising a top plate, a bottom plate, a plane clamping plate and a plurality of rods, one end of the rods being connected to the top plate and the other end being connected to the bottom plate; the plane clamping plate is located between the bottom plate and the top plate, the rods penetrate the plane clamping plate, the plane clamping plate is slidably connected to the rods, and the plane clamping plate and the bottom plate can clamp the battery cell;

[0008] The top plate is provided with a push device, and the push device is provided with a force measuring device, and the force measuring device can abut against the plane clamping plate;

[0009] The bottom plate is provided with a plurality of displacement measuring devices, and the displacement measuring devices can abut against the battery core.

[0010] The utility model discloses a device for detecting expansion of battery cells. The bottom plate and the plane clamping plate can clamp the two opposite sides of the battery cell. The pushing device arranged on the top plate controls the force measuring device to abut against the plane clamping plate, so that the force measuring device can measure the expansion force of the battery cell. The plane clamping plate is slidably connected with the rod body, so that the rod body guides the plane clamping plate, which can avoid the battery cell expansion detection error caused by the position offset of the plane clamping plate. The plurality of displacement measuring devices arranged on the bottom plate can realize the detection of the expansion displacement of the battery cell. The plurality of displacement measuring devices can abut against different positions of the large surface of the battery cell, so that the measurement result of the expansion displacement of the battery cell is more accurate. The utility model discloses a device for detecting expansion of battery cells. It can take into account the expansion force detection and the expansion position detection of the battery cell, so as to obtain a more accurate battery cell expansion detection result.

[0011] As a preferred solution of the utility model, the bottom plate includes a porous back plate and a porous clamping plate, the porous back plate is connected to the porous clamping plate, the rod body passes through the porous clamping plate, and the end of the rod body is connected to the porous back plate; the porous back plate is provided with a plurality of through mounting holes, each of which is provided with the displacement measuring device; the porous clamping plate is provided with a displacement measuring hole aligned with the mounting hole, and the displacement measuring device can pass through the displacement measuring hole. The porous clamping plate abuts against the battery cell, and the battery cell is clamped by the porous clamping plate and the plane clamping plate, so that the battery cell can be fixed at a specified position; the mounting hole provided on the porous back plate is aligned with the displacement measuring hole provided on the porous clamping plate, so that the provided displacement measuring device can abut against the battery cell, thereby realizing the measurement of the expansion displacement of the battery cell.

[0012] As a preferred solution of the utility model, the porous clamp is provided with a cell limit groove, the cell limit groove is used to clamp the cell, the bottom of the cell limit groove is provided with an expansion displacement groove, and the displacement measurement hole runs through the bottom of the expansion displacement groove. The cell limit groove enables the cell to be positioned at an appropriate expansion detection position, and an expansion displacement groove is provided at the bottom of the cell so that the cell can be displaced toward the expansion displacement groove when it expands, so that the displacement measurement device can accurately measure the expansion displacement of the cell; the cell limit groove is designed to imitate the outer contour of the test cell, with a 0.25mm gap reserved on both sides, and a 10mm deep groove is provided in the middle area of ​​the bottom of the cell limit groove as an expansion displacement groove, and the deep groove covers 80% of the large surface of the cell, which is in line with the characteristic that the large surface displacement during the cell expansion process is concentrated within 80% of the middle part of the cell.

[0013] As a preferred solution of the utility model, the expansion displacement groove is adapted to be provided with a plate-like structure, and the plate-like structure is detachably connected to the expansion displacement groove. A plurality of plate-like structures having the same shape as the expansion displacement groove are designed, and the thickness of the plate-like structure is 1 mm. The plate-like structure can be filled into the expansion displacement groove as needed, thereby achieving the requirement of detecting the expansion force of the battery cell with a given displacement amount; a through hole is provided on the plate-like structure, and the through hole is aligned and connected with the displacement measurement hole, so that the displacement measurement device can abut the battery cell.

[0014] As a preferred solution of the utility model, a plurality of the mounting holes are arranged in an array on the porous back plate, and the displacement measuring device includes a pen-shaped displacement sensor, which is adapted to be connected with the mounting holes. By adapting and connecting a plurality of pen-shaped displacement sensors to the mounting holes respectively, the pen-shaped displacement sensors are evenly distributed, and the expansion displacement detection data obtained is more accurate; the pen-shaped displacement sensor occupies a smaller installation space, and debugging is more convenient.

[0015] As a preferred solution of the utility model, the push device includes a screw rod, the screw rod passes through the top plate, the screw rod is adaptively connected to the top plate, a front end pressure plate is provided at the end of the screw rod, the front end pressure plate is rotatably connected to the screw rod, and the front end pressure plate is connected to the force measuring device. The screw rod and the front end pressure plate are rotatably connected through a bearing, and rotating the screw rod can push the front end pressure plate to move toward the plane clamping plate, so that the force measuring device abuts against the plane part, so that the force measuring device can display the force changes between the front end pressure plate and the plane clamping plate in real time, so that the expansion force of the battery cell can be intuitively displayed.

[0016] As a preferred solution of the utility model, the top plate is provided with a first extension part, the bottom plate is provided with a second extension part, the first extension part and the second extension part are arranged opposite to each other, the first extension part is provided with a guide rod, one end of the guide rod is connected to the first extension part, and the other end is connected to the second extension part, and the guide rod passes through the front end pressure plate. The guide rod can guide the front end pressure plate to avoid position deviation of the front end pressure plate, so that the front end pressure plate can only move along the axial direction of the guide rod; the force measuring device is preferably a plane pressure sensor, which can measure the expansion force of the battery cell more accurately.

[0017] As a preferred solution of the utility model, it also includes a connecting plate and a limiting assembly, one end of the connecting plate is detachably connected to the bottom plate, and the other end is detachably connected to the top plate, the limiting assembly is detachably connected to the connecting plate, and the limiting assembly can abut against the planar clamping plate. The connecting plate can strengthen the connection strength between the bottom plate and the top plate and support the bending piece, so that the limiting assembly can limit the planar clamping plate; the top plate and the bottom plate are both detachably connected to the connecting plate, so that the battery cell can be placed between the planar clamping plate and the bottom plate when the connecting plate is removed.

[0018] As a preferred solution of the utility model, the limit assembly includes a bending piece and a limit bolt; the bending piece is connected to the connecting plate, the limit bolt passes through the bending piece, and the limit bolt can abut against the plane clamping plate. The bending piece can make the limit bolt perpendicular to the plane clamping plate, so that the limit bolt can more easily adjust the position of the plane clamping plate.

[0019] As a preferred solution of the utility model, the connecting plate is provided with a plurality of connecting holes, and the connecting holes are detachably connected to the bending piece. By connecting the bending piece to different connecting holes, the bending piece can be fixed at different positions of the connecting plate, so that the limiting bolt can abut against the plane clamping plate at an appropriate position.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] 1. The utility model is a device for detecting the expansion of battery cells. The bottom plate and the plane clamping plate can clamp the opposite sides of the battery cell. The pushing device arranged on the top plate controls the force measuring device to abut against the plane clamping plate, so that the force measuring device can measure the expansion force of the battery cell. The plane clamping plate is slidably connected to the rod body, so that the rod body guides the plane clamping plate, which can avoid the battery cell expansion detection error caused by the position offset of the plane clamping plate. A plurality of displacement measuring devices arranged on the bottom plate can realize the detection of the expansion displacement of the battery cell. A plurality of displacement measuring devices can abut against different positions of the large surface of the battery cell, so that the measurement result of the expansion displacement of the battery cell is more accurate. The utility model is a device for detecting the expansion of battery cells. It can take into account the expansion force detection and the expansion position detection of the battery cell to obtain a more accurate battery cell expansion detection result.

[0022] 2. The utility model discloses a device for detecting battery cell expansion, which has a simple structure, is easy to manufacture and convenient to use. By measuring the expansion displacement at multiple positions of the battery cell, the problem of single battery cell expansion displacement data is solved. The device for detecting battery cell expansion can perform expansion force test and expansion displacement test, which solves the problem of large measurement error and poor consistency of existing fixtures. The device can meet the complex and diverse test conditions of battery cell expansion test and has good economic and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a device for detecting battery cell expansion according to Example 1;

[0024] Figure 2 is a structural schematic diagram of a device for detecting battery cell expansion according to Example 1;

[0025] Figure 3 is a structural schematic diagram of a device for detecting battery cell expansion according to Example 1;

[0026] Figure 4 is a schematic structural diagram of the bottom plate of Example 1;

[0027] Figure 5 is a schematic structural diagram of a plate-like structural member of Example 1;

[0028] Figure 6 is a schematic structural diagram of the limit assembly of Example 1;

[0029] Figure 7 This is a schematic diagram of the use status of a device for detecting battery cell expansion according to Example 1.

[0030] icon:

[0031] 1-top plate, 2-bottom plate, 3-plane splint, 4-rod body, 5-push device, 6-force measuring device, 7-displacement measuring device, 8-first extension, 9-second extension, 10-guide rod, 11-limiting assembly, 12-connecting plate, 13-battery cell, 14-plate-like structural member, 15-through hole, 21-porous back plate, 22-porous splint, 23-battery cell limiting groove, 24-expansion displacement groove, 25-mounting hole, 26-displacement measuring hole, 51-screw, 52-front end pressure plate, 111-bending member, 112-limiting bolt, 121-connecting hole. DETAILED DESCRIPTION

[0032] The utility model is described in detail below in conjunction with the accompanying drawings.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] Example 1

[0035] like Figure 1-Figure 7 A device for detecting battery cell expansion is shown, comprising a top plate 1, a bottom plate 2, a plane clamping plate 3 and a plurality of rods 4, one end of the rod 4 is connected to the top plate 1, and the other end is connected to the bottom plate 2; the plane clamping plate 3 is located between the bottom plate 2 and the top plate 1, the rod 4 passes through the plane clamping plate 3, the plane clamping plate 3 is slidably connected to the rod 4, and the plane clamping plate 3 and the bottom plate 2 can clamp the battery cell 13;

[0036] The top plate 1 is provided with a push device 5, and the push device 5 is provided with a force measuring device 6, and the force measuring device 6 can abut against the plane clamping plate 3;

[0037] The bottom plate 2 is provided with a plurality of displacement measuring devices 7 , and the displacement measuring devices 7 can abut against the battery cells 13 .

[0038] The bottom plate 2 and the plane clamping plate 3 can clamp the opposite sides of the battery cell 13, and the pushing device 5 arranged on the top plate 1 controls the force measuring device 6 to abut against the plane clamping plate 3, so that the force measuring device 6 can measure the expansion force of the battery cell 13; the plane clamping plate 3 is slidably connected with the rod body 4, so that the rod body 4 guides the plane clamping plate 3, which can avoid the battery cell expansion detection error caused by the position offset of the plane clamping plate 3; a plurality of displacement measuring devices 7 arranged on the bottom plate 2 realize the detection of the battery cell expansion displacement, and a plurality of displacement measuring devices 7 can abut against different positions of the large surface of the battery cell, so that the measurement result of the battery cell expansion displacement is more accurate; a device for battery cell expansion detection of the utility model can take into account the expansion force detection and the expansion position detection of the battery cell, and obtain a more accurate battery cell expansion detection result.

[0039] Specifically, the top plate 1, the bottom plate 2 and the plane clamping plate 3 are all rectangular plates, and the top plate 1, the bottom plate 2 and the plane clamping plate 3 are all perpendicular to the rod body 4. The rod body 4 is located at the edge of the rectangular structure, so that the battery cell 13 can be placed in the middle of the plane clamping plate 3 to avoid interference between the battery cell 13 and the rod body 4 during the battery cell expansion test. The rod body 4 is all cylindrical rods, and four cylindrical rods are set. Two cylindrical rods are set at one end of the rectangular plate and another two cylindrical rods are set at the other end. The multiple cylindrical rods are used to prevent the plane clamping plate 3 from being offset, so that the plane clamping plate 3 can only slide along the axial direction of the cylindrical rod.

[0040] Specifically, the bottom plate 2 is composed of a porous back plate 21 and a porous clamping plate 22. A support plate is arranged on the porous back plate 21, so that one end of the support plate is connected to the porous back plate 21 and the other end is connected to the porous clamping plate 22. Four cylindrical rods penetrate the edge of the porous clamping plate 22, so that the ends of the cylindrical rods are connected to the porous back plate 21; the porous back plate 21 is provided with a plurality of through mounting holes 25, and a displacement measuring device 7 is arranged in each mounting hole 25; the porous clamping plate 22 is provided with a displacement measuring hole 26 aligned with the mounting hole 25, and the displacement measuring device 7 can pass through Displacement measuring hole 26; a gap is left between the porous back plate 21 and the porous clamping plate 22 by the support plate, which is convenient for operators to install and debug the displacement measuring device 7, so that the displacement measuring device 7 can more accurately measure the expansion displacement of the battery cell 13; by setting a plurality of installation holes 25, a plurality of displacement measuring devices 7 can be abutted at different positions of the large surface of the battery cell, so that the measurement result of the expansion displacement of the battery cell is more accurate, avoiding the problem of a single measurement result of the expansion displacement of the battery cell, and making the measurement result of the expansion displacement of the battery cell more representative.

[0041] Specifically, the porous clamping plate 22 is provided with a battery cell limiting groove 23, the battery cell limiting groove 23 is used to clamp the battery cell 13, the bottom of the battery cell limiting groove 23 is provided with an expansion displacement groove 24, and the displacement measurement hole 26 passes through the bottom of the expansion displacement groove 24; the battery cell limiting groove 23 enables the battery cell 13 to be positioned at an appropriate expansion detection position, and the expansion displacement groove 24 is provided at the bottom of the battery cell 13, so that when the battery cell 13 expands, the large surface of the battery cell can be displaced toward the expansion displacement groove 24, and the displacement measurement device 7 passes through the expansion displacement groove The bottom of the groove 24 enables the displacement measuring device 7 to abut the outer wall of the battery cell 13, thereby detecting the expansion displacement of the battery cell; the battery cell limiting groove 23 is designed to imitate the outer contour of the test battery cell 13, with a 0.25mm gap reserved on both sides, and a 10mm deep groove is opened in the middle area of ​​the bottom of the limiting groove as the expansion displacement groove 24. The deep groove covers 80% of the large surface of the battery cell, which is in line with the characteristic that the displacement of the large surface of the battery cell during the expansion of the battery cell is concentrated within 80% of the middle part of the battery cell 13. The expansion displacement groove 24 is a rectangular groove.

[0042] Specifically, the expansion displacement groove 24 is adapted to be provided with a plate-like structure 14, and the plate-like structure 14 is detachably connected to the expansion displacement groove 24. The rectangular plate-like structure 14 is designed to be adapted to the expansion displacement groove 24, and the thickness of the plate-like structure 14 is 1 mm. The plate-like structure 14 can be filled into the expansion displacement groove 24 as needed, thereby achieving the requirement of detecting the expansion force of the battery cell with a given displacement amount; a through hole 15 is provided on the plate-like structure 14, so that the through hole 15 is aligned and connected with the displacement measurement hole 26, so that the displacement measurement device 7 can abut the battery cell 13, thereby measuring the expansion displacement of the battery cell 13.

[0043] Specifically, a plurality of mounting holes 25 are arranged on the porous back plate 21. The arranged mounting holes 25 can make the displacement measuring device 7 evenly distributed, so that the displacement data obtained by the displacement measuring device 7 is more representative, thereby improving the accuracy of the battery cell expansion displacement detection; the displacement measuring device 7 is a pen-type displacement sensor, and the pen-type displacement sensor is adaptably connected to the mounting holes 25; the pen-type displacement sensor occupies a smaller volume, which is convenient for operators to install and debug; fifteen mounting holes 25 are set on the porous back plate 21.

[0044] Specifically, the pushing device 5 is a screw rod 51, which vertically penetrates the top plate 1 from the middle of the top plate 1, and is threadedly connected to the top plate 1, so that an operating part is set at one end of the screw rod 51 and a front end pressure plate 52 is set at the other end, and a front end pressure plate 52 is set at the end of the screw rod 51. The screw rod 51 and the front end pressure plate 52 are rotatably connected, and a plane pressure sensor is set on the front end pressure plate 52 as a force measuring device 6, and the plane pressure sensor can abut against the middle of the plane clamping plate 3; by rotating the operating part, the screw rod 51 and the top plate 1 are displaced, and the screw rod 51 pushes the front end pressure plate 52, so that the front end pressure plate 52 drives the plane pressure sensor to abut against the plane clamping plate 3, and the size of the expansion force of the battery cell can be obtained by reading the data measured by the plane pressure sensor.

[0045] Specifically, the top plate 1 is provided with a first extension portion 8, and the bottom plate 2 is provided with a second extension portion 9. The first extension portion 8 and the second extension portion 9 are arranged opposite to each other. The first extension portion 8 is provided with a guide rod 10. One end of the guide rod 10 is connected to the first extension portion 8, and the other end is connected to the second extension portion 9. The guide rod 10 passes through the front end pressure plate 52. The guide rod 10 can guide the front end pressure plate 52 to avoid position displacement of the front end pressure plate 52, so that the front end pressure plate 52 can only move along the axial direction of the guide rod 10.

[0046] Specifically, the two limit assemblies 11 are respectively located on the opposite sides of the front pressure plate 52; the two limit assemblies 11 respectively abut against the planar clamp 3, so that the planar clamp 3 can support the battery cell 13 more stably, avoid displacement of the planar clamp 3, and ensure the measurement accuracy of the battery cell expansion displacement.

[0047] Specifically, the device for detecting the expansion of the battery cell also includes a connecting plate 12 and a limiting assembly 11. One end of the connecting plate 12 is detachably connected to the bottom plate 2, and the other end is detachably connected to the top plate 1. The limiting assembly 11 is composed of a bending piece 111 and a limiting bolt 112. The bending piece 111 can make the limiting bolt 112 perpendicular to the plane clamping plate 3, so that the limiting bolt 112 can more easily adjust the position of the plane clamping plate 3; the bending piece 111 is connected to the connecting plate 12, the limiting bolt 112 passes through the bending piece 111, and the limiting bolt 112 can abut against the plane clamping plate 3; the connecting plate 12 can strengthen the bottom plate 2 and the top plate 1, the connecting plate 12 supports the bending piece 111, so that the limiting bolt 112 can fix the plane clamping plate 3 at a predetermined position; the bending piece 111 adjusts the position of the limiting bolt 112 against the plane clamping plate 3; the connecting plate 12 is detachably connected to the top plate 1 and the bottom plate 2, so that the battery cell 13 can be placed between the plane clamping plate 3 and the bottom plate 2; a connecting hole 121 is provided on the connecting plate 12, and any connecting hole 121 can be connected to the bending piece 111, so that the bending piece 111 can be fixed at different positions of the connecting plate 12, so that the limiting bolt 112 can abut against the plane clamping plate 3 at an appropriate position.

[0048] Specifically, the limit assemblies 11 are respectively provided on the opposite sides of the front pressure plate 52; the two limit bolts 112 are respectively abutted against the plane clamping plate 3, so that the plane clamping plate 3 can support the battery cell 13 more stably, avoid displacement of the plane clamping plate 3, and ensure the measurement accuracy of the expansion displacement of the battery cell.

[0049] Method for using the device for detecting cell expansion in a constant initial preload cell expansion test:

[0050] Insert the battery cell 13 into the battery cell limiting groove 23, and move the plane clamp 3 to be close to the battery cell 13; calibrate the plane pressure sensor and the pen-type displacement sensor; rotate the screw 51 to make the front end pressure plate 52 press the plane pressure sensor to the preload value of the specified test condition; move the device for battery cell expansion detection to the temperature box and perform charge and discharge cycles on the battery cell 13; record the battery cell 13 data, the plane pressure sensor data, and the displacement sensor data; according to the unreasonable time points in the battery cell 13 data, compare the values ​​in the pressure sensor data and the displacement sensor data.

[0051] Method for using the device for detecting cell expansion displacement test under constant spacing:

[0052] Insert the battery cell 13 into the battery cell limit groove 23, and move the flat clamp to fit the battery cell 13; calibrate the plane pressure sensor and the pen-type displacement sensor; rotate the screw 51 to make the front end pressure plate 52 press the plane pressure sensor to the preload value of the specified test condition; tighten the limit components 11 on both sides of the front end pressure plate 52 to make the preload value of the battery cell 13 a constant initial preload value, and make the distance between the clamps on both sides of the battery cell 13 constant; the plane pressure sensor can be retracted as needed; if not retracted, during the cycle of the battery cell 13, the plane pressure sensor plays a role in monitoring whether the limit component 11 fails; move the device for battery cell expansion detection to the incubator and perform charge and discharge cycles on the battery cell 13; record the battery cell 13 data, the plane pressure sensor data, and the displacement sensor data; according to the unreasonable time points in the battery cell 13 data, compare the values ​​in the pressure sensor data and the displacement sensor data.

[0053] Method for using the device for data verification for battery cell expansion detection:

[0054] a. According to the data of the constant initial preload cell expansion test, adjust the initial preload value of the plane pressure sensor to perform a secondary charge and discharge cycle test for the unreasonable time point of the cell 13 data to verify the performance of the cell 13; simultaneously monitor whether the data changes of the displacement sensor are consistent with the first test.

[0055] b. According to the data of the battery cell expansion displacement test under a constant spacing, for the time point when the data of the battery cell 13 is unreasonable, find the expansion data value of the battery cell 13 at that time point, adjust the expansion data value of the thickness value of the plate-like structural member 14 placed on the porous clamp 22 to perform a secondary charge and discharge cycle test to verify the performance of the battery cell 13.

[0056] Example 2

[0057] The structure of the device for detecting the expansion of a battery cell in this embodiment is substantially the same as that of the embodiment 1. The difference from the embodiment 1 is that the number of the rods 4 is more than four.

[0058] In the device for detecting the expansion of a battery cell of the present embodiment, a plurality of rods 4 are provided so that the rods 4 can guide the planar clamping plate 3 more accurately. In some implementations, two or three rods 4 are provided.

[0059] Example 3

[0060] The structure of the device for detecting the expansion of a battery cell in this embodiment is substantially the same as that of the embodiment 1. The difference from the embodiment 1 is that the bending piece 111 is fixedly connected to the connecting plate 12 .

[0061] Reducing the connection structure can ensure the abutment stability of the limiting bolt 112 against the plane clamping plate 3.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting battery cell expansion, characterized in that: The invention comprises a top plate (1), a bottom plate (2), a plane clamping plate (3) and a plurality of rod bodies (4); one end of the rod body (4) is connected to the top plate (1) and the other end is connected to the bottom plate (2); the plane clamping plate (3) is located between the bottom plate (2) and the top plate (1); the rod body (4) passes through the plane clamping plate (3); the plane clamping plate (3) is slidably connected to the rod body (4); and the plane clamping plate (3) and the bottom plate (2) are capable of clamping a battery cell (13); The top plate (1) is provided with a push device (5), the push device (5) is provided with a force measuring device (6), and the force measuring device (6) is capable of abutting against the plane clamping plate (3); The bottom plate (2) is provided with a plurality of displacement measuring devices (7), and the displacement measuring devices (7) are capable of abutting against the battery core (13).

2. A device for detecting battery cell expansion according to claim 1, characterized in that: The bottom plate (2) comprises a porous back plate (21) and a porous clamping plate (22), the porous back plate (21) and the porous clamping plate (22) being connected, the rod body (4) passing through the porous clamping plate (22), and the end of the rod body (4) being connected to the porous back plate (21); the porous back plate (21) is provided with a plurality of through-going mounting holes (25), each of which is provided with the displacement measuring device (7); the porous clamping plate (22) is provided with a displacement measuring hole (26) aligned with the mounting hole (25), and the displacement measuring device (7) can pass through the displacement measuring hole (26).

3. A device for detecting battery cell expansion as claimed in claim 2, characterized in that: The porous clamping plate (22) is provided with a battery cell limiting groove (23), the battery cell limiting groove (23) is used to clamp the battery cell (13), an expansion displacement groove (24) is provided at the bottom of the battery cell limiting groove (23), and the displacement measurement hole (26) passes through the bottom of the expansion displacement groove (24).

4. A device for detecting battery cell expansion as claimed in claim 3, characterized in that: The expansion displacement groove (24) is adapted to be provided with a plate-like structural member (14), and the plate-like structural member (14) is detachably connected to the expansion displacement groove (24).

5. A device for detecting battery cell expansion as claimed in claim 2, characterized in that: A plurality of the mounting holes (25) are arranged in an array on the porous back plate (21), and the displacement measuring device (7) comprises a pen-shaped displacement sensor, which is adaptably connected to the mounting holes (25).

6. A device for detecting battery cell expansion as claimed in claim 1, characterized in that: The push device (5) comprises a screw rod (51), the screw rod (51) passes through the top plate (1), the screw rod (51) is adaptively connected to the top plate (1), a front end pressure plate (52) is provided at the end of the screw rod (51), the front end pressure plate (52) is rotatably connected to the screw rod (51), and the front end pressure plate (52) is connected to the force measuring device (6).

7. A device for detecting battery cell expansion as claimed in claim 6, characterized in that: The top plate (1) is provided with a first extension portion (8), and the bottom plate (2) is provided with a second extension portion (9). The first extension portion (8) and the second extension portion (9) are arranged opposite to each other. The first extension portion (8) is provided with a guide rod (10), one end of the guide rod (10) is connected to the first extension portion (8), and the other end is connected to the second extension portion (9). The guide rod (10) passes through the front end pressure plate (52).

8. A device for detecting battery cell expansion according to any one of claims 1 to 7, characterized in that: It also comprises a connecting plate (12) and a limiting assembly (11), wherein one end of the connecting plate (12) is detachably connected to the bottom plate (2) and the other end is detachably connected to the top plate (1), the limiting assembly (11) is detachably connected to the connecting plate (12), and the limiting assembly (11) is capable of abutting against the planar clamping plate (3).

9. A device for detecting battery cell expansion as claimed in claim 8, characterized in that: The limiting assembly (11) comprises a bending piece (111) and a limiting bolt (112); the bending piece (111) is connected to the connecting plate (12), the limiting bolt (112) passes through the bending piece (111), and the limiting bolt (112) can abut against the planar clamping plate (3).

10. A device for detecting battery cell expansion as claimed in claim 9, characterized in that: The connecting plate (12) is provided with a plurality of connecting holes (121), and the connecting holes (121) are detachably connected to the bending piece (111).

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