Positioning device for long battery cell

The clamping assembly guided by the guide block simplifies the positioning device of the long battery cell, solves the problems of complex structure and high cost, and achieves the effect of space saving and cost reduction.

CN223277841UActive Publication Date: 2025-08-29HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Application Number
CN202422634649.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-30
Publication Date
2025-08-29
Estimated Expiration
2034-10-30

AI Technical Summary

Technical Problem

The positioning device of the medium- and long battery cells in the prior art is complex in structure, takes up a large space and is costly, which affects practicality.

Method used

The lifting plate, the first guide block and the second guide block are used to cooperate, and the lifting plate is driven up by the driving mechanism, and the guide block is used to guide the first and second clamping components to be clamped and positioned close to the battery cell, reducing dependence on multiple sets of cylinders.

Benefits of technology

It realizes simplified structure, reduced space occupation and reduced costs, ensuring the practicality and stability of the positioning device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a positioning device for a long battery cell in the technical field of battery production, and aims to solve the problems of more complex structure, larger occupied space and higher cost of a positioning device in the prior art. The device comprises a mounting plate and a placing plate, the mounting plate and the placing plate are connected through a guide shaft, the outer wall of the guide shaft is sleeved with a lifting plate, and a driving mechanism is arranged on the mounting plate; a first clamping assembly and a second clamping assembly are arranged at the top of the lifting plate, a first guide block is arranged on one side of the first clamping assembly at the bottom of the placing plate, and a second guide block is arranged on one side of the second clamping assembly at the bottom of the placing plate; the battery cell clamping and positioning device is suitable for fixing the battery cell, only the lifting plate needs to be driven to ascend, the first clamping assembly and the second clamping assembly are driven to move close to the battery cell through the first guide block and the second guide block respectively, so that the battery cell is clamped and positioned, multiple sets of air cylinders do not need to be adopted for working, and the battery cell clamping and positioning device is simple in structure, small in occupied space and low in cost.
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Description

Technical Field

[0001] The utility model relates to a positioning device for a long battery core, belonging to the technical field of battery production. Background Art

[0002] As the basic unit of a battery, the battery cell requires positioning and clamping at many workstations during its production process. During the positioning process, the long and short sides of the battery cell are generally positioned. To this end, a typical positioning device uses two sets of cylinders to position the long and short sides of the battery cell. However, for today's long battery cells, such as blade batteries, due to the excessive length of the long side, multiple sets of cylinders are required for positioning. In addition, the short side positioning cylinders make the entire positioning mechanism complex, with multiple movements, large space occupation, and correspondingly increased costs.

[0003] In summary, the existing technology usually requires the use of multiple sets of cylinders to perform positioning work when positioning the long and short sides of long battery cells, resulting in a more complex structure of the positioning device, occupying a large space and high cost, which affects the practicality of the positioning device. Utility Model Content

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a positioning device for a long battery cell, so as to solve the problem that the positioning device has a relatively complex structure, occupies a large space, and has a high cost, which affects the practicality of the positioning device.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The utility model provides a positioning device for long battery cells, comprising a mounting plate and a placement plate for placing the battery cells, wherein the mounting plate and the placement plate are connected via a guide shaft, a lifting plate is sleeved on the outer wall of the guide shaft, and a driving mechanism is provided on the mounting plate for driving the lifting plate to rise and fall;

[0007] A first slidingly connected clamping assembly and a second slidingly connected clamping assembly are provided on the top of the lifting plate, a first guide block is provided on one side of the first clamping assembly at the bottom of the placement plate, and a second guide block is provided on one side of the second clamping assembly at the bottom of the placement plate.

[0008] According to the above technical solution, when the lifting plate rises, the first clamping assembly is guided by the first guide block, and the second clamping assembly is guided by the second guide block, so that both the first clamping assembly and the second clamping assembly move close to the battery cell, thereby clamping and fixing the battery cell, thereby simplifying the structure of the device and avoiding occupying too much space.

[0009] Furthermore, when the lifting plate rises, the first guide block is used to guide the first clamping assembly to push the first clamping assembly close to the battery cell, and the second guide block is used to guide the second clamping assembly to push the second clamping assembly close to the battery cell.

[0010] In the above technical solution, the first guide block and the second guide block respectively guide the first clamping assembly and the second clamping assembly, thereby ensuring the stability of the first clamping assembly and the second clamping assembly when they move.

[0011] Furthermore, the driving mechanism includes a lifting cylinder arranged on the mounting plate, the output end of the lifting cylinder is provided with a floating joint, the bottom of the lifting plate is provided with a connecting block matching the floating joint, and the floating joint is movably connected to the connecting block.

[0012] The above technical solution drives the lifting plate to move by the lifting cylinder, and at the same time prevents the displacement between the lifting cylinder and the lifting plate by cooperating with the connecting block through the floating joint, thereby ensuring the stability of the lifting plate when it is raised and lowered.

[0013] Furthermore, a linear bearing is provided on the top of the lifting plate, and the linear bearing is slidably connected to the guide shaft.

[0014] The above technical solution ensures the stability of the lifting plate when it is raised or lowered, while ensuring the guiding effect of the guide shaft on the lifting plate, by slidingly connecting the linear bearing and the guide shaft.

[0015] Furthermore, the first clamping assembly includes a base plate, a first slider is provided at the bottom of the base plate, a first guide rail slidably connected to the first slider is provided at the top of the lifting plate, a first mounting block is provided on the outer wall of the base plate, a first cam is provided on the outer wall of the first mounting block on one side of the first guide block, the top of the base plate is detachably connected to the first clamping block mounting block, and the top of the first clamping block mounting block is provided with a first clamping block.

[0016] The above technical solution ensures the stability of the base plate when sliding through the cooperation of the first guide rail and the first slider, reduces friction loss through the contact between the first cam and the first guide block, and ensures the service life of the device. The first clamping block mounting block is detachably connected to the base plate, and the relative position between the first clamping block and the base plate can be adjusted according to actual work requirements, thereby ensuring the practicality of the device.

[0017] Furthermore, a first spring mounting block is provided on the top of the lifting plate at one side of the bottom plate, and the bottom plate is elastically connected to the first spring mounting block via a first spring.

[0018] According to the above technical solution, after the lifting plate is lowered, the first spring and the first spring mounting block cooperate to push the bottom plate back to its original position without manual restoration, while loosening the battery cell to facilitate the next positioning work.

[0019] Furthermore, the number of the first clamping block mounting blocks is multiple.

[0020] The above technical solution can provide multiple first clamping block mounting blocks and first clamping blocks according to the actual length of the battery cell, thereby ensuring the clamping and positioning effect of the battery cell.

[0021] Furthermore, the second clamping assembly includes a second mounting block, a second slider is provided at the bottom of the second mounting block, a second guide rail is provided on the top of the lifting plate that is slidably connected to the second slider, the top of the second mounting block is detachably connected to the second clamping block mounting block, the top of the second clamping block mounting block is provided with a second clamping block, and the outer wall of the second mounting block is provided with a second cam on one side of the second guide block.

[0022] The above technical solution ensures the stability of the second mounting block when sliding by cooperating with the second slider and the second guide rail. The second clamping block mounting block and the second mounting block are detachably connected. The relative position of the second clamping block and the second mounting block can be adjusted according to actual work requirements. The friction loss is reduced by contacting the second guide block through the second cam.

[0023] Furthermore, a second spring mounting block is provided at the bottom of the second mounting block, and the second spring mounting block is elastically connected to the outer wall of the lifting plate through a second spring.

[0024] According to the above technical solution, when the lifting plate is lowered, the second spring cooperates with the second spring mounting block to push the second mounting block back to its original position without manual reset, while releasing the battery cell to facilitate the next positioning work.

[0025] Furthermore, the number of the first clamping assemblies and the number of the second clamping assemblies are both two, the two first clamping assemblies are symmetrically arranged on the front and rear sides of the lifting plate, and the two second clamping assemblies are symmetrically arranged on the left and right sides of the lifting plate.

[0026] The above technical solution clamps the front and rear sides of the battery cell by two first clamping assemblies, and clamps the left and right sides of the battery cell by two second clamping assemblies, thereby ensuring the stability of the battery cell when it is fixed.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The positioning device of the long battery cell cooperates with the lifting plate, the first guide block and the second guide block. When positioning the battery cell, it is only necessary to drive the lifting plate upward, and drive the first clamping assembly and the second clamping assembly to move close to the battery cell through the first guide block and the second guide block respectively, so as to clamp and position the battery cell. The present application does not need to use multiple sets of cylinders to work, and only needs to drive the lifting plate through the driving mechanism to complete the clamping and positioning of the battery cell. The structure is simple, the space occupied is small, the cost is low, and the practicality of the device is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a three-dimensional schematic diagram of an embodiment of a positioning device for a long battery cell according to the present utility model;

[0030] Figure 2 It is a three-dimensional schematic diagram of a lifting plate of a positioning device for a long battery cell according to the utility model;

[0031] Figure 3 It is a three-dimensional schematic diagram of a first clamping assembly of a positioning device for a long battery cell according to the utility model;

[0032] Figure 4 It is a three-dimensional schematic diagram of a second clamping assembly of a positioning device for a long battery cell according to the utility model.

[0033] In the figure: 100, battery cell; 101, mounting plate; 102, lifting cylinder; 103, floating joint; 104, connecting block; 105, lifting plate; 106, guide shaft; 107, linear bearing; 108, placement plate; 2, first clamping assembly; 201, base plate; 202, first slider; 203, first guide rail; 204, first clamping block mounting block; 205, first clamping block; 206, first mounting block; 207, first cam; 208, first guide block; 209, first spring; 210, first spring mounting block; 3, second clamping assembly; 301, second mounting block; 302, second slider; 303, second guide rail; 304, second clamping block mounting block; 305, second clamping block; 306, second cam; 307, second guide block; 308, second spring mounting block; 309, second spring. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. 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. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, the utility model provides a positioning device for long battery cells, including a mounting plate 101 and a placement plate 108 for placing the battery cell 100, the mounting plate 101 and the placement plate 108 are connected by a guide shaft 106, the outer wall of the guide shaft 106 is provided with a lifting plate 105, and the mounting plate 101 is provided with a driving mechanism for driving the lifting plate 105 to rise and fall; the top of the lifting plate 105 is provided with a first clamping assembly 2 and a second clamping assembly 3 that are slidably connected, the bottom of the placement plate 108 is provided with a first guide block 208 on one side of the first clamping assembly 2, and the bottom of the placement plate 108 is provided with a second guide block 307 on one side of the second clamping assembly 3; when the lifting plate 105 rises, the first guide block 208 is used to guide the first clamping assembly 2 to push the first clamping assembly 2 close to the battery cell 100, and the second guide block 307 is used to guide the second clamping assembly 3 to push the second clamping assembly 3 close to the battery cell 100.

[0039] Specifically, when the battery cell 100 needs to be positioned, the battery cell 100 is first placed above the placement plate 108, and then the driving mechanism is controlled to start working. The driving mechanism pushes the lifting plate 105 to move upward along the guide shaft 106. The guide shaft 106 guides the lifting plate 105. The first clamping assembly 2 and the second clamping assembly 3 move upward with the lifting plate 105. As the movement proceeds, the first clamping assembly 2 approaches the first guide block 208, and the second clamping assembly 3 approaches the second guide block 307. When After the first clamping assembly 2 contacts the first guide block 208, the first guide block 208 guides the first clamping assembly 2, pushing the first clamping assembly 2 close to the battery cell 100, and the second guide block 307 guides the second clamping assembly 3, pushing the second clamping assembly 3 close to the battery cell 100, so that the first clamping assembly 2 cooperates with the second clamping assembly 3 to clamp and fix the battery cell 100 on the lifting plate 105, thereby completing the positioning of the battery cell 100; optionally, the first clamping assembly 2 and the second clamping assembly 3 are The number of clamping components 3 is two, the two first clamping components 2 are symmetrically arranged on the front and rear sides of the lifting plate 105, and the two second clamping components 3 are symmetrically arranged on the left and right sides of the lifting plate 105. The first clamping component 2 clamps the front and rear sides of the battery cell 100, that is, clamps the long side of the battery cell 100, and the second clamping component 3 clamps the left and right sides of the battery cell 100, that is, clamps the short side of the battery cell 100; this application uses the lifting plate 105, the first guide block 208 and the second guide block In cooperation with the block 307, when positioning the battery cell 100, it is only necessary to drive the lifting plate 105 to rise, and drive the first clamping assembly 2 and the second clamping assembly 3 to move close to the battery cell 100 through the first guide block 208 and the second guide block 307 respectively, so as to clamp and position the battery cell 100. This application does not require the use of multiple sets of cylinders to work, and only needs to drive the lifting plate 105 through the driving mechanism to complete the clamping and positioning of the battery cell 100. The structure is simple, takes up little space, and has low cost, which ensures the practicality of the device.

[0040] In this embodiment, optionally, the first guide block 208 and the second guide block 307 are both trapezoidal blocks, and the inclined surfaces of the trapezoidal blocks guide the first cam 207 and the second cam 306; optionally, the first guide block 208 and the second guide block 307 are triangular blocks.

[0041] Example 2

[0042] like Figure 2As shown, in one embodiment, the driving mechanism includes a lifting cylinder 102 arranged on the mounting plate 101, a floating joint 103 is provided at the output end of the lifting cylinder 102, a connecting block 104 matching the floating joint 103 is provided at the bottom of the lifting plate 105, and the floating joint 103 is movably connected to the connecting block 104.

[0043] Specifically, when it is necessary to drive the lifting plate 105 to rise, the lifting cylinder 102 starts working, and drives the lifting plate 105 to move up and down through the floating joint 103 and the connecting block 104. The floating joint 103 cooperates with the connecting block 104 to avoid offset between the lifting cylinder 102 and the lifting plate 105, thereby ensuring the stability of the lifting cylinder 102 when working; optionally, the driving mechanism is an electric telescopic rod.

[0044] In this embodiment, a linear bearing 107 is provided on the top of the lifting plate 105, and the linear bearing 107 is slidably connected to the guide shaft 106. The sliding connection between the linear bearing 107 and the guide shaft 106 ensures the stability of the lifting plate 105 during lifting and lowering; optionally, the number of guide shafts 106 is multiple, and the lifting plate 105 is provided with multiple linear bearings 107 slidably connected to the guide shaft 106.

[0045] Example 3

[0046] like Figure 3 As shown, an embodiment, the first clamping assembly 2 includes a base plate 201, a first slider 202 is provided at the bottom of the base plate 201, a first guide rail 203 slidably connected to the first slider 202 is provided at the top of the lifting plate 105, a first mounting block 206 is provided on the outer wall of the base plate 201, a first cam 207 is provided on the outer wall of the first mounting block 206 on one side of the first guide block 208, a first clamping block mounting block 204 is detachably connected to the top of the base plate 201, a first clamping block 205 is provided on the top of the first clamping block mounting block 204, a first spring mounting block 210 is provided on the top of the lifting plate 105 on one side of the base plate 201, the base plate 201 is elastically connected to the first spring mounting block 210 through a first spring 209, and the number of the first clamping block mounting blocks 204 is multiple.

[0047] When in use, when the lifting plate 105 rises, the first guide rail 203 and the first slider 202 cooperate to drive the bottom plate 201 to move upward, and the first clamping block mounting block 204, the first clamping block 205, the first mounting block 206 and the first cam 207 move with the bottom plate 201. As the movement progresses, the first cam 207 contacts the inclined surface of the first guide block 208, and the first guide block 208 guides the first cam 207, thereby pushing the first cam 207 toward the battery cell 100. The first mounting block 206, the bottom plate 201, the first clamping block mounting block 204 and the first clamping block 205 move with the first cam 207. The first guide rail 203 and the first slider 202 guide the bottom plate 201, so that the bottom plate 201 and the lifting plate 105 slide relative to each other. When the lifting plate 105 moves upward to a certain height, the first clamping block 205 approaches the battery cell 100 and contacts the battery cell 100, thereby clamping and fixing the battery cell 100. When the first cam 207 drives the bottom plate 201 to move, the bottom plate 201 and the first spring mounting block 210 approach each other, and the first spring 209 is compressed. When the lifting cylinder 102 drives the lifting plate 105 to descend, the first guide block 208 no longer limits the first cam 207. At this time, the first spring 209 can push the bottom plate 201 to return to its original position to facilitate the next clamping work. There is no need for manual resetting, which ensures the convenience of the device. Optionally, the number of the first clamping block mounting blocks 204 is multiple and can be adjusted according to the length of the battery cell 100 to ensure the fixing effect of the battery cell 100 and ensure the applicability of the device.

[0048] like Figure 4 As shown, in this embodiment, the second clamping assembly 3 includes a second mounting block 301, a second slider 302 is provided at the bottom of the second mounting block 301, and a second guide rail 303 is provided on the top of the lifting plate 105 for sliding connection with the second slider 302. The top of the second mounting block 301 is detachably connected to a second clamping block mounting block 304, and the top of the second clamping block mounting block 304 is provided with a second clamping block 305. The outer wall of the second mounting block 301 is provided with a second cam 306 on one side of the second guide block 307, and the bottom of the second mounting block 301 is provided with a second spring mounting block 308. The second spring mounting block 308 is elastically connected to the outer wall of the lifting plate 105 through a second spring 309.

[0049] Specifically, when the lifting plate 105 rises, the second mounting block 301 is driven to move upward by the second slider 302 and the second guide rail 303, and the second cam 306, the second clamping block mounting block 304 and the second clamping block 305 move with the second mounting block 301. As the movement proceeds, the second cam 306 first contacts the inclined surface of the second guide block 307, and the second guide block 307 guides the second cam 306, thereby driving the second mounting block 301 and the lifting plate 105 to slide relative to each other. The second clamping block mounting block 304 and the second clamping block 305 move with the second mounting block. 301 moves, and the second slider 302 and the second guide rail 303 guide the second mounting block 301. When the lifting plate 105 rises to a certain height, the second clamping block 305 contacts the battery cell 100 and clamps it. When the second mounting block 301 slides, the second spring mounting block 308 is relatively close to the lifting plate 105, and the second spring 309 is compressed. When the lifting plate 105 descends, the second guide block 307 no longer blocks the second cam 306. At this time, the second spring 309 can push the second mounting block 301 to return to its original position, ensuring the convenience of the device.

[0050] In this embodiment, the base plate 201 is detachably connected to the first clamping block mounting block 204 for adjusting the position of the first clamping block 205 ; the second mounting block 301 is detachably connected to the second clamping block mounting block 304 for adjusting the position of the second clamping block 305 .

[0051] In summary, the utility model drives the lifting plate 105 up and down through the driving mechanism, and at the same time drives the first clamping component 2 and the second clamping component 3 to move closer to and away from the battery cell 100, thereby achieving the clamping and loosening of the battery cell 100; compared with the traditional clamp that requires multiple sets of positioning cylinders to position and clamp the battery cell 100 at different positions, the present application only requires one lifting action of the driving mechanism to clamp the battery cell 100, which reduces the space occupied by the mechanism and the cost, optimizes the action and improves the efficiency.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A positioning device for a long battery cell, characterized in that: The invention comprises a mounting plate (101) and a placement plate (108) for placing an electric core (100), wherein the mounting plate (101) and the placement plate (108) are connected via a guide shaft (106), a lifting plate (105) is sleeved on the outer wall of the guide shaft (106), and a driving mechanism for driving the lifting plate (105) to rise and fall is provided on the mounting plate (101); The top of the lifting plate (105) is provided with a first clamping assembly (2) and a second clamping assembly (3) that are slidably connected. The bottom of the placement plate (108) is provided with a first guide block (208) on one side of the first clamping assembly (2). The bottom of the placement plate (108) is provided with a second guide block (307) on one side of the second clamping assembly (3).

2. The positioning device for a long battery cell according to claim 1, characterized in that: When the lifting plate (105) rises, the first guide block (208) is used to guide the first clamping assembly (2) so as to push the first clamping assembly (2) close to the battery cell (100), and the second guide block (307) is used to guide the second clamping assembly (3) so as to push the second clamping assembly (3) close to the battery cell (100).

3. The positioning device for a long battery cell according to claim 1, characterized in that: The driving mechanism comprises a lifting cylinder (102) arranged on the mounting plate (101), a floating joint (103) is provided at the output end of the lifting cylinder (102), a connecting block (104) matching the floating joint (103) is provided at the bottom of the lifting plate (105), and the floating joint (103) is movably connected to the connecting block (104).

4. The positioning device for a long battery cell according to claim 1, characterized in that: A linear bearing (107) is provided on the top of the lifting plate (105), and the linear bearing (107) is slidably connected to the guide shaft (106).

5. The positioning device for a long battery cell according to claim 1, characterized in that: The first clamping assembly (2) includes a base plate (201), a first slider (202) is provided at the bottom of the base plate (201), a first guide rail (203) slidably connected to the first slider (202) is provided at the top of the lifting plate (105), a first mounting block (206) is provided on the outer wall of the base plate (201), a first cam (207) is provided on the outer wall of the first mounting block (206) on one side of the first guide block (208), a first clamping block mounting block (204) is detachably connected to the top of the base plate (201), and a first clamping block (205) is provided on the top of the first clamping block mounting block (204).

6. The positioning device for a long battery cell according to claim 5, characterized in that: A first spring mounting block (210) is provided on the top of the lifting plate (105) on one side of the bottom plate (201), and the bottom plate (201) is elastically connected to the first spring mounting block (210) via a first spring (209).

7. The positioning device for a long battery cell according to claim 5, characterized in that: The number of the first clamping block mounting blocks (204) is multiple.

8. The positioning device for a long battery cell according to claim 1, characterized in that: The second clamping assembly (3) includes a second mounting block (301), a second slider (302) is provided at the bottom of the second mounting block (301), a second guide rail (303) is provided on the top of the lifting plate (105) and is slidably connected to the second slider (302), a second clamping block mounting block (304) is detachably connected to the top of the second mounting block (301), a second clamping block (305) is provided on the top of the second clamping block mounting block (304), and a second cam (306) is provided on the outer wall of the second mounting block (301) on one side of the second guide block (307).

9. The positioning device for a long battery cell according to claim 8, characterized in that: A second spring mounting block (308) is provided at the bottom of the second mounting block (301), and the second spring mounting block (308) is elastically connected to the outer wall of the lifting plate (105) via a second spring (309).

10. The positioning device for a long battery cell according to claim 1, characterized in that: The number of the first clamping assemblies (2) and the number of the second clamping assemblies (3) are both two, the two first clamping assemblies (2) are symmetrically arranged on the front and rear sides of the lifting plate (105), and the two second clamping assemblies (3) are symmetrically arranged on the left and right sides of the lifting plate (105).