An electrode assembly for a lithium secondary battery
Patent Information
- Application Number
- CN202522039979.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-09-23
AI Technical Summary
[0016] When a battery cell needs to be wound, the cell to be wound is fed onto the winding needle body. The winding driver then drives the winding needle body to rotate, completing the winding of the cell. When the winding needle body winds the cell to the set number of turns, the insert body slides towards the winding needle body and passes through the surface of the cell. The winding needle body then continues to wind the cell. When the winding needle body winds the cell to the set number of turns, the above steps are repeated until the winding needle body completes the winding of the cell. Finally, the wound cell is removed from the winding needle body, thus completing the winding process. The gaps between the layers of the wound cell are concentrated at a set number of layers, and the remaining layers of the cell are tightly wound together. This makes it less likely for wrinkles to occur between the layers of the cell when the wound cell is compressed to eliminate the gaps, and problems such as incomplete stress relief are less likely to occur. This improves the problem that when the cells are wound, the gaps between the layers of the cell are located at the layers of the cell, which makes it easy for wrinkles or incomplete stress relief to occur between the layers of the compressed cell when the cell is compressed into a square battery, thus affecting the quality of the cell.
Smart Images
Figure CN224759410U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery production, and in particular to a cell winding device. Background Technology
[0002] Currently, the industry requires a winding process for the production of wound lithium batteries. This process has advantages such as high production efficiency and low cost. The lithium battery cell consists of a separator and positive and negative electrode sheets. During the winding process, the winding needle of the winding device is generally used to wind the cell into a battery before further processing. The winding needle is the core part of the winding process. In square batteries manufactured using the winding process, gaps are prone to appear between the layers, making it difficult for the outer layers of the cell to shrink proportionally. In order to eliminate the gaps between the layers of the cell, the cell is usually compressed to achieve the effect of eliminating the gaps between the layers of the cell. During the winding of the cell, the gaps between the layers of the cell are located in the layers of the cell. Therefore, when the cell is compressed into a square battery, wrinkles or incomplete stress relief are likely to occur between the compressed layers of the cell, which affects the quality of the cell. Summary of the Invention
[0003] In order to improve the quality of battery cells and avoid problems such as incomplete elimination of stress due to wrinkles between layers of the battery cell during winding, this application provides a battery cell winding device.
[0004] The battery cell winding device provided in this application adopts the following technical solution:
[0005] A battery cell winding device includes a winding base, at least one winding driver, and at least one winding mechanism, wherein each of the winding drivers is disposed on the winding base;
[0006] The winding mechanism includes a winding needle body and at least one insert body. The winding needle body is fixedly disposed on the winding driver. The winding needle body can wind the battery cell into a battery cell. Each insert body is disposed on the winding driver, and each insert body can slide along the length direction of the winding needle body. The winding driver can drive the winding needle body and each insert body to rotate, so that the winding needle body completes the winding of the battery cell.
[0007] By adopting the above technical solution, when the battery cell needs to be wound, the battery cell to be wound is fed into the winding needle body. Then, the winding driver drives the winding needle body to rotate, completing the winding of the battery cell. When the winding needle body winds the battery cell to a set number of turns, the insert body slides towards the direction of the winding needle body and passes through the surface of the battery cell. The winding needle body then continues to wind the battery cell. When the winding needle body winds the battery cell to a set number of turns, the above steps are repeated until the winding needle body completes the winding of the battery cell. Finally, the wound battery cell is removed from the winding needle body and... This design concentrates the gaps between the layers of the wound cell at a set number of layers, while the remaining layers of the cell are tightly wound together. This prevents wrinkles and incomplete stress relief between the layers when the wound cell is compressed to eliminate gaps. This improves the problem of wrinkles or incomplete stress relief between the layers of the cell during the winding process, which is common when the gaps between the layers of the cell are located at the layers of the cell during the winding process. This addresses the issue of wrinkles or incomplete stress relief between the compressed layers of the cell when the cell is compressed into a square battery, thus affecting the quality of the cell.
[0008] Optionally, the winding mechanism further includes at least one insert driving assembly, each insert driving assembly being used to drive each insert body to slide. The insert driving assembly includes a linear driving module and an insert driving rod. The linear driving module is fixedly disposed on the winding seat, and the insert driving rod is disposed on the slider of the linear driving module. The insert driving rod is capable of driving the insert body to slide.
[0009] Optionally, each of the insert drive components further includes an insert drive shaft, each insert drive shaft is slidably engaged with a winding driver, each insert drive shaft is fixedly connected to each insert body, each insert drive shaft is coaxially arranged, and each insert drive shaft is slidably engaged with each other.
[0010] Optionally, the insert drive assembly further includes an insert drive ring, which is coaxially fixed to the insert drive shaft. The insert drive ring has an insert drive groove, and the insert drive rod passes through the insert drive groove.
[0011] Optionally, the insert drive assembly further includes an insert drive cylinder, which is fixedly mounted on the slider of the linear drive module. The insert drive rod is slidably engaged with the slider of the linear drive module, and the piston rod of the insert drive cylinder is fixedly connected to the insert drive rod.
[0012] Optionally, the needle coil body includes two needle coil portions, which are capable of sliding toward each other or toward each other.
[0013] Optionally, the winding mechanism further includes a needle drive assembly, which includes a needle drive protrusion that slides in conjunction with the winding driver. When the needle drive protrusion slides toward the needle body, it can push the two needle portions to slide away from each other.
[0014] Optionally, the needle winding drive assembly further includes a needle winding drive cylinder, a needle winding drive block, and a needle winding drive ring. The needle winding drive cylinder is fixedly mounted on the winding seat. The needle winding drive block is slidably fitted onto the winding seat and fixedly connected to the piston rod of the needle winding drive cylinder. The needle winding drive ring is connected to a needle winding drive protrusion. The needle winding drive ring has a needle winding drive groove, and the needle winding drive block passes through the needle winding drive groove.
[0015] In summary, this application includes at least one of the following beneficial technical effects:
[0016] When a battery cell needs to be wound, the cell to be wound is fed onto the winding needle body. The winding driver then drives the winding needle body to rotate, completing the winding of the cell. When the winding needle body winds the cell to the set number of turns, the insert body slides towards the winding needle body and passes through the surface of the cell. The winding needle body then continues to wind the cell. When the winding needle body winds the cell to the set number of turns, the above steps are repeated until the winding needle body completes the winding of the cell. Finally, the wound cell is removed from the winding needle body, thus completing the winding process. The gaps between the layers of the wound cell are concentrated at a set number of layers, and the remaining layers of the cell are tightly wound together. This makes it less likely for wrinkles to occur between the layers of the cell when the wound cell is compressed to eliminate the gaps, and problems such as incomplete stress relief are less likely to occur. This improves the problem that when the cells are wound, the gaps between the layers of the cell are located at the layers of the cell, which makes it easy for wrinkles or incomplete stress relief to occur between the layers of the compressed cell when the cell is compressed into a square battery, thus affecting the quality of the cell. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;
[0018] Figure 2 This is a partial structural schematic diagram of an embodiment of this application;
[0019] Figure 3 This is a schematic diagram of the overall structure of the winding mechanism according to an embodiment of this application;
[0020] Figure 4 This is a schematic diagram of the winding driver structure according to an embodiment of this application;
[0021] Figure 5 This is a schematic diagram of the needle body structure according to an embodiment of this application;
[0022] Figure 6 This is a schematic diagram of the needle section structure according to an embodiment of this application;
[0023] Figure 7 This is a cross-sectional view of the winding needle drive assembly structure according to an embodiment of this application;
[0024] Figure 8 This is a schematic diagram of the winding needle drive assembly structure according to an embodiment of this application;
[0025] Figure 9 This is a schematic diagram of the insert body structure according to an embodiment of this application;
[0026] Figure 10 This is a cross-sectional view of the insert driver assembly according to an embodiment of this application;
[0027] Figure 11 This is a schematic diagram of the insert driver component structure according to an embodiment of this application.
[0028] Explanation of reference numerals in the attached drawings: 1. Winding seat; 11. Locking seat; 12. Locking cylinder; 13. Locking disc; 2. Winding driver; 21. Fixing part; 22. Rotating part; 3. Winding mechanism; 31. Needle body; 311. Seat part; 312. Needle part; 3121. Needle bearing; 3122. Needle groove; 32. Needle drive assembly; 321. Needle rod; 322. Needle drive protrusion; 323. Needle drive cylinder; 324. Needle drive block; 325. Needle drive ring; 3251. Needle drive groove; 33. Insert body; 34. Insert drive assembly; 341. Linear drive module; 342. Insert drive rod; 343. Insert drive cylinder; 344. Insert drive shaft; 345. Insert drive ring; 3451. Insert drive groove. Detailed Implementation
[0029] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.
[0030] This application discloses a battery cell winding apparatus. (Refer to...) Figures 1 to 4 A battery cell winding device includes a winding seat 1, three winding drivers 2 and three winding mechanisms 3. Each winding driver 2 is disposed on the winding seat 1. Each winding driver 2 includes a fixed part 21 and a rotating part 22. The fixed part 21 is fixedly connected to the winding seat 1. The rotating part 22 is rotatably disposed on the fixed part 21, and the fixed part 21 can drive the rotating part 22 to rotate. Each winding driver 2 is evenly distributed around the axis of the winding seat 1. Each winding mechanism 3 is disposed on the winding seat 1.
[0031] Reference Figure 5 and Figure 6The winding mechanism 3 includes a needle winding body 31 and a needle winding drive assembly 32. The needle winding body 31 is disposed on the rotating part 22 of the winding driver 2, so that the rotating part 22 can drive the needle winding body 31 to rotate circumferentially around the axis of the rotating part 22. The needle winding body 31 includes a base part 311 and two needle winding parts 312. The base part 311 is coaxially fixedly disposed on the rotating part 22. The two needle winding parts 312 slide and cooperate with the base part 311 in the radial direction of the base part 311, so that the two needle winding parts 312 can slide towards each other or away from each other. Both needle winding parts 312 are rotatably connected to a needle winding bearing 3121. Both needle winding parts 312 have needle winding grooves 3122 engraved on their surfaces. The needle winding drive assembly 32 is used to drive the two needle winding parts 312 to slide.
[0032] Reference Figure 7 The needle winding drive assembly 32 includes a needle winding rod 321, a needle winding drive protrusion 322, and multiple needle winding springs. The needle winding rod 321 is slidably fitted onto the rotating part 22 along the axial direction of the rotating part 22. The needle winding rod 321 is rectangular. The needle winding drive protrusion 322 is fixedly disposed at one end of the needle winding rod 321. The radial dimension of the needle winding drive protrusion 322 near the end of the needle winding body 31 is smaller than the radial dimension of the end of the needle winding drive protrusion 322 away from the needle winding body 31. The two sides of the needle winding drive protrusion 322 respectively abut against two needle winding bearings 3121, so that the needle winding rod 321 drives the needle winding drive protrusion 322. 2. When sliding towards the direction of the needle winding body 31, the two sides of the needle winding drive protrusion 322 push the two needle winding parts 312 to move away from each other until the distance between the two needle winding parts 312 is maximized. Each needle winding spring is respectively set between the two needle winding parts 312 and the seat part 311. One end of each needle winding spring is fixedly connected to the two needle winding parts 312, and the other end of each needle winding spring is fixedly connected to the seat part 311. When the needle winding drive protrusion 322 slides away from the needle winding body 31, each needle winding spring pushes the two needle winding parts 312 to slide towards each other, so that the needle winding body 31 loosens the tension on the wound battery cell.
[0033] A locking seat 11 is fixedly provided on the winding seat 1. A locking cylinder 12 is provided between the locking seat 11 and the winding seat 1. The locking cylinder 12 is fixedly connected to the locking seat 11. The piston rod of the locking cylinder is fixedly connected to the winding seat 1 so that the locking seat 11 can move towards or away from the winding seat 1. A plurality of locking discs 13 are fixedly provided on the locking seat 11. The locking discs 13 have locking grooves. When the winding mechanism 3 starts to wind the battery cell, each winding needle body 31 is connected to each locking disc 13 respectively, and both winding needle parts 312 are inserted into the locking grooves so that the distance between the two winding needle parts 312 always remains stable and is not prone to deviation.
[0034] Reference Figure 8The needle winding drive assembly 32 also includes a needle winding drive cylinder 323, a needle winding drive block 324, and a needle winding drive ring 325. The needle winding drive cylinder 323 is fixedly mounted on the winding seat 1. The needle winding drive block 324 is slidably fitted onto the winding seat 1 and fixedly connected to the piston rod of the needle winding drive cylinder 323. The needle winding drive ring 325 is fixed to the needle winding rod 321 so that when the needle winding drive ring 325 slides along the axis of the rotating part 22, the needle winding drive ring 325 can drive the needle winding drive protrusion 322 to slide along the axis of the rotating part 22. The needle drive ring 325 is coaxially arranged with the rotating part 22. The needle drive ring 325 has a needle drive groove 3251 with a groove body in the shape of a circle. The needle drive block 324 passes through the needle drive groove 3251 so that when the needle drive block 324 moves, the needle drive block 324 abuts and cooperates with the groove body of the needle drive groove 3251, thereby pushing the needle drive ring 325 to move. At the same time, when the needle drive ring 325 rotates with the rotating part 22, the needle drive ring 325 does not easily drive the needle drive block 324 to rotate.
[0035] Reference Figures 9 to 11 The winding mechanism 3 also includes two insert bodies 33 and two insert drive assemblies 34. The two insert bodies 33 are located on both sides of the thickness direction of the winding needle body 31, and the two insert bodies 33 slide and cooperate with the rotating part 22 along the axis of the rotating part 22, so that the two insert bodies 33 can slide towards or away from the winding needle body 31 along the axis of the rotating part 22, and the two insert bodies 33 can follow the rotating part 22 to rotate around the axis of the rotating part 22. The two insert drive assemblies 34 are used to drive the two insert bodies 33 respectively.
[0036] Reference Figures 9 to 11 The insert drive assembly 34 includes a linear drive module 341, an insert drive rod 342, and an insert drive cylinder 343. The linear drive module 341 is fixedly mounted on the winding seat 1. The slider of the linear drive module 341 can slide along the axis of the rotating part 22. The insert drive rod 342 slides and engages with the slider of the linear drive module 341. The insert drive cylinder 343 is fixedly mounted on the slider of the linear drive module 341. The piston rod of the insert drive cylinder 343 is fixedly connected to the insert drive rod 342.
[0037] Reference Figures 9 to 11The insert drive assembly 34 also includes an insert drive shaft 344 and an insert drive ring 345. The insert drive shaft 344 of each insert drive assembly 34 is slidably fitted to the rotating part 22 along the axis of the rotating part 22, and the rotating part 22 can drive each insert drive shaft 344 to rotate around the axis of the rotating part 22. Each insert drive shaft 344 is fixedly connected to each insert body 33, and each insert drive shaft 344 is coaxially arranged and slidably fitted to each other. The insert drive ring 345 is coaxially fixed to the insert drive shaft 344. The insert drive ring 345 has an insert drive groove 3451, and the insert drive rod 342 passes through the insert drive groove 3451.
[0038] The implementation principle of a battery cell winding device according to an embodiment of this application is as follows: When a battery cell needs to be wound, the battery cell to be wound is fed onto the winding needle body 31. Then, the winding driver 2 drives the winding needle body 31 to wind, and the winding needle body 31 rotates to complete the winding of the battery cell. When the winding needle body 31 winds the battery cell to a set number of turns, the insert body 33 slides towards the direction close to the winding needle body 31 and passes through the surface of the battery cell. Then, the winding needle body 31 continues to wind the battery cell. When the winding needle body 31 winds the battery cell to a set number of turns, the above steps are repeated until the winding needle body 31 completes the winding of the battery cell. Then, the winding needle drive assembly 32 drives, and the winding needle drive protrusion 322 slides away from the winding needle body 31, thereby causing the winding needle drive protrusion 322 to release the two winding needles. The contact of the two coil needles 312 with the battery cell changes from a taut state to a relaxed state, allowing the operator to easily detach the wound battery cell from the coil needle body 31. The gaps between the layers of the wound battery cell are concentrated at a set number of layers, and the remaining layers of the battery cell are tightly wound together. This makes it less likely for wrinkles to occur between the layers of the battery cell when the wound battery cell is compressed to eliminate gaps, and problems such as incomplete stress relief are not easily eliminated. This improves the problem that when the battery cell is wound, the gaps between the layers of the battery cell are located in the layers of the battery cell, which makes it easy for wrinkles to occur between the layers of the compressed battery cell or incomplete stress relief when the battery cell is compressed into a square battery, thus affecting the quality of the battery cell.
[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A battery cell winding device, characterized in that: It includes a winding base (1), at least one winding driver (2) and at least one winding mechanism (3), wherein each of the winding drivers (2) is disposed on the winding base (1); The winding mechanism (3) includes a winding needle body (31) and at least one insert body (33). The winding needle body (31) is fixedly disposed on the winding driver (2). The winding needle body (31) can wind the battery cell into a battery cell. Each insert body (33) is disposed on the winding driver (2), and each insert body (33) can slide along the length direction of the winding needle body (31). The winding driver (2) can drive the winding needle body (31) and each insert body (33) to rotate so that the winding needle body (31) can complete the winding of the battery cell.
2. The battery cell winding device according to claim 1, characterized in that: The winding mechanism (3) further includes at least one insert driving assembly (34), each insert driving assembly (34) being used to drive each insert body (33) to slide. The insert driving assembly (34) includes a linear driving module (341) and an insert driving rod (342). The linear driving module (341) is fixedly disposed on the winding seat (1), and the insert driving rod (342) is disposed on the slider of the linear driving module (341). The insert driving rod (342) is capable of driving the insert body (33) to slide.
3. The battery cell winding device according to claim 2, characterized in that: Each of the insert drive assemblies (34) further includes an insert drive shaft (344), each insert drive shaft (344) is slidably engaged with the winding driver (2), each insert drive shaft (344) is fixedly connected to each insert body (33), each insert drive shaft (344) is coaxially arranged, and each insert drive shaft (344) is slidably engaged with each other.
4. A cell winding device according to claim 3, characterized in that: The insert drive assembly (34) further includes an insert drive ring (345), which is coaxially fixed to the insert drive shaft (344). The insert drive ring (345) has an insert drive groove (3451), and the insert drive rod (342) passes through the insert drive groove (3451).
5. A cell winding device according to claim 2, characterized in that: The insert drive assembly (34) further includes an insert drive cylinder (343), which is fixedly mounted on the slider of the linear drive module (341). The insert drive rod (342) is slidably engaged with the slider of the linear drive module (341), and the piston rod of the insert drive cylinder (343) is fixedly connected to the insert drive rod (342).
6. The battery cell winding device according to claim 1, characterized in that: The needle coil body (31) includes two needle coil portions (312), which are capable of sliding toward each other or toward each other.
7. A cell winding device according to claim 6, characterized in that: The winding mechanism (3) further includes a winding needle drive assembly (32), which includes a winding needle drive protrusion (322). The winding needle drive protrusion (322) is slidably engaged with the winding driver (2). When the winding needle drive protrusion (322) slides toward the winding needle body (31), the winding needle drive protrusion (322) can push the two winding needle portions (312) to slide away from each other.
8. A cell winding device according to claim 7, characterized in that: The needle winding drive assembly (32) further includes a needle winding drive cylinder (323), a needle winding drive block (324), and a needle winding drive ring (325). The needle winding drive cylinder (323) is fixedly disposed on the winding seat (1). The needle winding drive block (324) is slidably fitted on the winding seat (1) and fixedly connected to the piston rod of the needle winding drive cylinder (323). The needle winding drive ring (325) is connected to the needle winding drive protrusion (322). The needle winding drive ring (325) has a needle winding drive groove (3251). The needle winding drive block (324) passes through the needle winding drive groove (3251).