Lithium battery current collector positioning device
The precise positioning of the lithium battery current collector is achieved by using a limiting frame, positioning plate, and spring clamping mechanism, which solves the problems of inaccurate positioning and cell damage, and improves the production quality and efficiency of lithium batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中汽新能(天津)电池科技有限公司
- Filing Date
- 2025-06-13
- Publication Date
- 2026-07-07
AI Technical Summary
In current lithium battery production, inaccurate current collector positioning leads to poor welding quality and low battery yield. Furthermore, traditional positioning devices are prone to damaging battery cells and have poor versatility.
It adopts a limiting frame, positioning plate, and upper and side clamping mechanism, and uses spring pressure to gently position the battery cell, achieving six-sided all-round fixation, and adapting to battery cells of different sizes.
Improve welding quality, reduce cell damage, increase the yield of finished batteries, enhance device versatility, and reduce production costs.
Smart Images
Figure CN224472479U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a lithium battery current collector positioning device. Background Technology
[0002] In the production process of lithium batteries for new energy commercial vehicles, after the battery cell is installed in the casing, current collectors need to be welded to both sides of the positive and negative electrode tabs. The positioning accuracy of the current collectors directly affects the welding quality. If the positioning is inaccurate, the laser beam is prone to deviate from the predetermined position during laser welding, resulting in incomplete welding. At the same time, the relative angle deviation of the current collectors after welding may be too large, affecting the subsequent electrode tab bending and capping processes, ultimately reducing the finished product qualification rate (A-grade rate) of the battery.
[0003] In existing technologies, some battery cell fixing mechanisms use rigid clamping devices such as cylinders to position the battery cells. For example, the current collector welding battery cell fixing mechanism disclosed in Chinese Patent (Application No.: CN202022205531.8) uses a cylinder to drive a clamping block to press the side of the battery cell. However, such devices rely on the rigid pressure of the cylinder, resulting in insufficient pressure control precision. Excessive pressure can easily damage the battery cell, affecting battery performance and reliability. In addition, traditional positioning devices are usually complex in structure, inconvenient to adjust, and difficult to adapt to the production needs of battery cells of different sizes, exhibiting poor versatility.
[0004] Therefore, there is an urgent need for a lithium battery current collector positioning device that can accurately locate, avoid cell damage, and is easy to operate, in order to solve the problems of insufficient positioning accuracy and cell fragility in the existing technology, and improve the quality and efficiency of battery production. Utility Model Content
[0005] The purpose of this invention is to provide a lithium battery current collector positioning device to solve the problems existing in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery current collector positioning device, comprising:
[0007] The limiting frame is a semi-open structure with support platforms for placing battery cells on both sides of the bottom.
[0008] A positioning plate is installed on the top of the limiting frame to position the rear side of the battery cell.
[0009] An upper clamping mechanism is located on both sides of the limiting frame and is used to clamp and fix the upper part of the battery cell.
[0010] A side clamping mechanism is provided at the opening of the limiting frame to clamp and fix the front side of the battery cell.
[0011] The upper pressing mechanism and the side pressing mechanism are both pressed by the elastic force of springs, and the upper pressing mechanism and the side pressing mechanism respectively complete the pressing or releasing action by rotating the pull rod.
[0012] Preferably, the upper pressing mechanism includes two pressing units arranged symmetrically on the left and right, each pressing unit including a first pressing block, a first spring, a first pull rod and a first fixing sleeve;
[0013] The first spring is sleeved on the first pull rod, and the first pressure block is fixed to the top of the first pull rod;
[0014] The first pull rod can slide along the first fixed sleeve, and the first pressure block can be pressed against the battery cell by pushing it upward and then rotating it 180°.
[0015] The first spring is located between the end of the first pull rod and the first fixing sleeve, providing a downward pulling force to maintain the compressed state.
[0016] Preferably, the top of the first fixing sleeve is provided with a U-shaped groove, and the bottom of the first pressing block is provided with a locking block that matches the U-shaped groove;
[0017] The locking block can be inserted into the U-shaped slot under the action of the first spring to lock the first pressing block.
[0018] Preferably, both the U-shaped slot and the card block are elongated structures.
[0019] Preferably, the side clamping mechanism includes a second pressure block, a second spring, a second pull rod, and a second fixing sleeve;
[0020] The second pull rod passes through the second fixed sleeve and is connected to the second pressure block, and the second spring is sleeved on the second pull rod;
[0021] The second pull rod is provided with a handle at its end, and the handle is provided with insertion slots on both sides;
[0022] The second fixing sleeve is provided with a limiting groove that mates with the insertion slot. By pulling and rotating the handle, the insertion slot is engaged into the limiting groove to lock and tighten.
[0023] Preferably, the side of the second pressure block contacts and engages with the side of the battery cell, and the battery cell is pressed and fixed by the elastic force of the second spring.
[0024] Preferably, the limiting frame consists of a left limiting frame and a right limiting frame, the distance between the two is adjusted by a connecting plate to accommodate battery cells of different sizes, and they are fixed by bolts.
[0025] Preferably, the positioning plate is located on the rear side of the limiting frame and cooperates with the side pressing mechanism.
[0026] Preferably, the height of the support platform is adjustable to accommodate battery cells of different thicknesses.
[0027] Preferably, the contact surfaces of the first and second pressing blocks are respectively provided with rubber layers.
[0028] The beneficial effects of this utility model are as follows: This utility model uses spring pressure to clamp the battery cell, which provides a gentler pressure compared to traditional rigid clamping methods such as cylinders. For example, the first spring in the upper clamping mechanism and the second spring in the side clamping mechanism effectively buffer the pressure, preventing damage to the battery cell, ensuring its performance and safety, reducing battery quality problems caused by cell damage, and improving the battery's finished product qualification rate. The battery cell is simultaneously clamped and fixed from the top and sides, and with the help of the limiting frame, positioning plate, and support platform, all-round positioning of the six sides of the battery cell is achieved. The bottom of the battery cell is supported by the support platform, the upper part is clamped by the upper clamping mechanism, the left and right sides are limited by the left and right limiting frames, the rear side is positioned by the positioning plate, and the front side is clamped by the side clamping mechanism. This ensures the precise positioning of the battery cell when welding the current collector, effectively preventing current collector welding misalignment, improving welding quality, providing a good foundation for subsequent tab bending and capping processes, and improving the overall quality of the battery. The limiting frame adopts an adjustable structure, consisting of two L-shaped left and right limiting frames connected by a connecting plate and bolts. The distance between the two sides of the limiting frame can be adjusted according to the width of the battery cell, which can meet the production needs of battery cells of different sizes, reduce the repeated purchase cost of production equipment, improve equipment utilization, and enhance the practicality of the device in lithium battery production. Attached Figure Description
[0029] Figure 1 This is the front view of the present invention;
[0030] Figure 2 This is a top view of the present invention;
[0031] Figure 3 This is a side view of the present invention;
[0032] Figure 4 This is a perspective view of the upper pressing mechanism in this utility model;
[0033] Figure 5 This is a perspective view of the side pressing mechanism in this utility model;
[0034] Explanation of reference numerals in the attached drawings: 1. Limiting frame; 2. Positioning plate; 3. Upper pressing mechanism; 31. First pressing block; 32. First spring; 33. First pull rod; 34. First fixing sleeve; 35. U-shaped groove; 4. Side pressing mechanism; 41. Second pressing block; 42. Second spring; 43. Second pull rod; 44. Second fixing sleeve; 45. Limiting groove; 46. Insertion groove. Detailed Implementation
[0035] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.
[0036] like Figure 1 and Figure 2 As shown, a lithium battery current collector positioning device includes a limiting frame 1, a positioning plate 2, an upper clamping mechanism 3, and a side clamping mechanism 4. The limiting frame 1 is used to place the battery cell. The limiting frame has a semi-open structure to facilitate cell placement. Support platforms 11 for placing the battery cell are provided on both sides of the bottom of the limiting frame. In use, the battery cell to be welded is placed on the support platform. The distance between the two sides of the limiting frame can be adjusted according to the width of the battery cell. Specifically, a connecting plate 5 is provided at the upper part of the limiting frame. The limiting frame is composed of two L-shaped left limiting frames 12 and right limiting frames 13. The upper parts of the left and right limiting frames are fixed to the connecting plate with bolts by adjusting the appropriate distance. By setting the limiting frame into two parts, it can be adapted to battery cells of different sizes, making the device more versatile.
[0037] like Figure 3 and Figure 4 As shown, there are two upper clamping mechanisms 3, one on the left and one on the right. These mechanisms are used to clamp and position the upper part of the battery cell. Each mechanism includes a first pressing block 31, a first spring 32, a first pull rod 33, and a first fixing sleeve 34. The upper clamping mechanisms are located on both sides of the limiting frame. The first spring is sleeved on the first pull rod, and the first pressing block is fixed to the top of the first pull rod. Pushing the first pressing block upwards and rotating it 180° with the first pull rod clamps the battery cell within the limiting frame. The first pull rod slides within the first fixing sleeve, and the spring is located between the end of the first pull rod and the first fixing sleeve, ensuring the first pull rod always has a downward pulling force. A U-shaped groove 35 is provided at the top of the first fixing sleeve. Accordingly, the bottom of the first pressing block is provided with a locking block 36 that matches the U-shaped slot. The locking block can be inserted into the U-shaped slot under the action of the spring. Both the U-shaped slot and the locking block are elongated. In use, in the initial state, the locking block is at the top of the U-shaped slot, and the two are in a cross-shaped state. When the first pressing block needs to press the surface of the battery cell, push the first pull rod upward and rotate it 90°, and then release the first pull rod. At this time, the locking block will enter the U-shaped slot under the action of the spring, so that the first pressing block moves down a distance to press the surface of the battery cell. This pressing position is also the installation position of the current collector, that is, pressing the current collector and the battery cell together.
[0038] The upper clamping mechanism uses the tension of the first spring to press the first pressure block against the surface of the battery cell without damaging the battery cell. In addition, when using this device, only one upper clamping mechanism can be used depending on the actual situation of the battery cell.
[0039] Similarly, the side clamping mechanism 4 consists of a second pressure block 41, a second spring 42, a second pull rod 43, and a second fixing sleeve 44, except that its direction is perpendicular to the upper clamping mechanism. The principle is the same. The function of the side clamping mechanism is to position the battery cell from the side. After the battery cell is positioned, the current collector can be accurately welded. Specifically, the second fixing sleeve is provided with a limiting groove 45, and the handle at the end of the second pull rod is provided with a insertion groove 46 that cooperates with the limiting groove. When the second pull rod is pulled back and rotated 90°, the insertion groove will fall into the limiting groove, and the front of the second pressure block will press and limit the side of the battery cell, thereby effectively preventing the battery cell from moving. The side clamping mechanism clamps the outermost part of the battery cell. It is equivalent to using the elastic force of the second spring to push the outer side of the battery cell with the second pressure block. The bottom of the battery cell is supported by the support platform, the upper part is clamped by the upper clamping mechanism, the left and right sides are limited by the left and right limit frames, the rear side is positioned by the positioning plate, and the front side is clamped by the side clamping mechanism. In other words, all six sides of the battery cell are limited and fixed. After the whole is accurately positioned, the current collector is welded, which can greatly improve the welding quality.
[0040] In use, the limiting frame 1 is first adjusted according to the width of the battery cell. The limiting frame 1 consists of two L-shaped left limiting frames 12 and right limiting frames 13. By adjusting the position of the bolts on the upper connecting plate 5, the distance between the left and right limiting frames is changed to accommodate battery cells of different sizes. Then, the battery cell to be welded is placed on the support platforms 11 on both sides of the bottom of the limiting frame 1 to complete the initial positioning of the battery cell. The support platforms 11 serve to support the battery cell.
[0041] The upper clamping mechanism 3 is located on both sides of the limiting frame 1, one on each side. Taking one side as an example, in the initial state, the locking block 36 at the bottom of the first pressing block 31 and the U-shaped slot 35 at the top of the first fixing sleeve 34 are in a cross-shaped state. When it is necessary to clamp the battery cell, push the first pull rod 33 upward. At this time, the first spring 32 is compressed, and the first pull rod 33 drives the first pressing block 31 to rise. Then rotate the first pull rod 33 180° to align the locking block 36 with the U-shaped slot 35. Release the first pull rod 33, and under the elastic force of the first spring 32, the locking block 36 inserts into the U-shaped slot 35. The first pressing block 31 moves downward to clamp the upper part of the battery cell, pressing the current collector and the battery cell together to fix the upper part of the battery cell. This clamping position corresponds to the installation position of the current collector.
[0042] Pulling the second lever 43 stretches the second spring 42 and rotates it 90°, causing the insertion slot 46 to fall into the limiting slot 45. At this time, the second pressure block 41, under the elastic force of the second spring 42, presses the side of the battery cell tightly and limits it, preventing the battery cell from shifting laterally during the welding process.
[0043] After the above steps, the bottom of the battery cell is supported by the support platform 11, the upper part is pressed by the upper clamping mechanism 3, the left and right sides are limited by the left and right limiting frames, the rear side is positioned by the positioning plate 2, and the front side is pressed by the side clamping mechanism 4, achieving all-round limiting and fixing of the battery cell on all six sides. Under this precise positioning state, the current collector welding on both sides of the positive and negative electrode tabs of the battery cell can effectively avoid deviation from the predetermined position during laser beam welding, reduce the phenomenon of incomplete welding, and at the same time ensure that the relative angle of the current collector after welding meets the requirements, providing a guarantee for the subsequent electrode tab bending and capping processes, and improving the A-grade yield of the battery.
[0044] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.
Claims
1. A lithium battery current collector positioning device, characterized in that, include: Limiting frame (1), the limiting frame (1) is a semi-open structure, and the bottom two sides are provided with support platforms (11) for placing the battery cells. Positioning plate (2) is installed on the top of the limiting frame (1) for positioning the rear side of the battery cell; The upper pressing mechanism (3) is set on both sides of the limiting frame (1) and is used to press and fix the upper part of the battery cell. The side clamping mechanism (4) is set at the opening of the limiting frame (1) and is used to clamp and fix the front side of the battery cell. The upper pressing mechanism (3) and the side pressing mechanism (4) are both pressed by the elastic force of the spring, and the upper pressing mechanism (3) and the side pressing mechanism (4) respectively complete the pressing or releasing action by rotating the pull rod.
2. The lithium battery current collector positioning device according to claim 1, characterized in that: The upper pressing mechanism (3) includes two pressing units arranged symmetrically on the left and right. Each pressing unit includes a first pressing block (31), a first spring (32), a first pull rod (33), and a first fixing sleeve (34). The first spring (32) is sleeved on the first pull rod (33), and the first pressure block (31) is fixed to the top of the first pull rod (33); The first pull rod (33) can slide along the first fixed sleeve (34), and the first pressure block (31) can press the battery cell by pushing it upward and rotating it 180°. The first spring (32) is located between the end of the first pull rod (33) and the first fixing sleeve (34), providing a downward pulling force to maintain the compressed state.
3. The lithium battery current collector positioning device according to claim 2, characterized in that: The top of the first fixing sleeve (34) is provided with a U-shaped slot (35), and the bottom of the first pressing block (31) is provided with a locking block (36) that matches the U-shaped slot (35). The locking block (36) can be inserted into the U-shaped slot (35) under the action of the first spring (32) to lock the first pressing block (31).
4. The lithium battery current collector positioning device according to claim 3, characterized in that: Both the U-shaped slot (35) and the card block (36) are elongated structures.
5. The lithium battery current collector positioning device according to claim 1, characterized in that: The side pressing mechanism (4) includes a second pressing block (41), a second spring (42), a second pull rod (43), and a second fixing sleeve (44). The second pull rod (43) passes through the second fixing sleeve (44) and is connected to the second pressure block (41), and the second spring (42) is sleeved on the second pull rod (43); The second pull rod (43) has a handle at its end, and the handle has insertion slots (46) on both sides. The second fixing sleeve (44) is provided with a limiting groove (45) that cooperates with the insertion groove (46). By pulling and rotating the handle, the insertion groove (46) is inserted into the limiting groove (45) to lock and press.
6. The lithium battery current collector positioning device according to claim 5, characterized in that: The side of the second pressure block (41) contacts and engages with the side of the battery cell, and the battery cell is pressed and fixed by the elastic force of the second spring (42).
7. The lithium battery current collector positioning device according to claim 1, characterized in that: The limiting frame (1) consists of a left limiting frame (12) and a right limiting frame (13). The spacing between the two is adjusted by a connecting plate (5) to accommodate different sizes of battery cells, and they are fixed by bolts.
8. The lithium battery current collector positioning device according to claim 1, characterized in that: The positioning plate (2) is located on the rear side of the limiting frame (1) and cooperates with the side pressing mechanism (4).
9. The lithium battery current collector positioning device according to claim 1, characterized in that: The height of the support platform (11) is adjustable to accommodate cells of different thicknesses.
10. The lithium battery current collector positioning device according to claim 2, characterized in that: The contact surfaces of the first and second pressure blocks are respectively provided with rubber layers.