Collecting plate and cylindrical full-tab battery
By forming an annular concave surface and convex surface on the current collecting plate and setting liquid injection holes on the inside and outside of it, the liquid injection effect and welding strength problems caused by excessive or too small welding area are solved, and high-efficiency electrolyte injection and high-strength welding are achieved to meet the requirements of high-rate charging and discharge.
Patent Information
- Application Number
- CN202421899819.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The welding area between the existing current collecting disk and the end surface of the battery cell is too large or too small, which affects the liquid injection effect and welding strength of the electrolyte, resulting in the inability to achieve high-rate charging and discharge performance.
An annular concave surface is punched along the axial direction of the current collecting disk, and a corresponding annular convex surface is formed on the other side surface, and a corresponding annular convex surface is fixed by welding and fixing with the end face of the battery core. At the same time, a liquid injection hole is provided on the inner and/or the outer side of the annular concave surface for electrolyte injection.
It ensures that the liquid injection effect of the electrolyte is not affected, and at the same time, the welding strength between the current collecting disk and the end surface of the battery cell is improved, achieving high-speed charging and discharging performance.
Smart Images
Figure CN223066410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and particularly relates to a current collector plate and a cylindrical full-tab battery. Background Art
[0002] In the related art, the full-tab design of cylindrical batteries can change the current flow path in the current collector, increase the current-carrying area of the tabs, and thus achieve high-rate charge and discharge performance.
[0003] After the core of the full-tab structure is flattened, the area of the tabs can be increased, and then the current collector plate is welded to the end face of the flattened core by laser welding. However, the welding surface of the existing current collector plate is in flat contact with the end face of the core. If the welding area is too large, the infiltration channel of the electrolyte is easily blocked during the liquid injection operation, affecting the liquid injection effect and further affecting the performance of the battery. If the welding area is too small, the welding strength will be affected, resulting in the inability to achieve high-rate charge and discharge performance. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a current collector plate that neither affects the liquid injection effect of the electrolyte nor ensures the welding strength.
[0005] To achieve the above purpose, the utility model provides a current collector plate for welding and fixing to the end face of a core. An annular concave surface is formed by stamping on one side surface of the current collector plate along its axial direction. An annular convex surface corresponding to the annular concave surface is formed on the other side surface of the current collector plate. The current collector plate is welded and fixed to the end face of the core through the annular convex surface.
[0006] Liquid injection holes are arranged on the current collector plate inside and / or outside the annular concave surface. The liquid injection holes are used to inject electrolyte into the core.
[0007] Preferably, the liquid injection holes include a first liquid injection hole and a second liquid injection hole. The first liquid injection hole is arranged on the current collector plate inside the annular concave surface and is set as a circular hole. The second liquid injection hole is arranged on the current collector plate outside the annular concave surface and is set as an arc-shaped strip hole.
[0008] Preferably, a plurality of the first liquid injection holes are arranged, and the plurality of first liquid injection holes are evenly spaced around the center of the current collector plate.
[0009] Preferably, a plurality of the second liquid injection holes are arranged, and the plurality of second liquid injection holes are evenly spaced around the center of the current collector plate.
[0010] Preferably, the annular convex surface is welded and fixed to the end face of the core through a plurality of continuous weld marks.
[0011] Preferably, the continuous welding marks are arranged along the radial direction of the current collector plate, and a plurality of the continuous welding marks are evenly spaced around the center of the current collector plate.
[0012] Preferably, the inner diameter of the annular concave surface is 8-12 mm.
[0013] Preferably, the area of the annular concave surface is greater than or equal to 45% of the total area of the current collector plate.
[0014] Preferably, the depth of the annular concave surface is 50%-60% of the thickness of the current collector plate.
[0015] The present utility model further provides a cylindrical full-tab battery, which includes a battery cell and the above-mentioned current collector plate, and the current collector plate is fixedly welded to the end surface of the battery cell.
[0016] In the technical solution provided by the present utility model, an annular concave surface is formed by stamping along the axial direction on one side surface of the current collector plate, so as to form a corresponding annular convex surface on the other side surface of the current collector plate. The annular convex surface is an annular continuous surface formed on the surface of the current collector plate, and it is used as a welding surface to be fixedly welded to the end surface of the battery cell, effectively ensuring the welding strength between the current collector plate and the end surface of the battery cell. In addition, by providing liquid injection holes on the current collector plate inside and / or outside the annular concave surface, electrolyte is injected into the battery cell through the liquid injection holes, so that the liquid injection effect of the electrolyte can be ensured without affecting the welding strength between the current collector plate and the end surface of the battery cell. Description of the Drawings
[0017] Figure 1 is a schematic structural diagram of a current collector plate provided by the present utility model;
[0018] Figure 2 is a front view of a current collector plate provided by the present utility model;
[0019] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in
[0020] Figure 4 is a schematic diagram of welding marks of a current collector plate provided by the present utility model welded to the end surface of a battery cell;
[0021] Figure 5 is a schematic structural diagram of a current collector plate provided by the present utility model welded to a battery cell;
[0022] Description of the Reference Numerals
[0023] 10. Current collector plate; 11. Annular concave surface; 111. First liquid injection hole; 112. Second liquid injection hole; 12. Annular convex surface; 13. Continuous welding mark; 14. Central disk surface; 20. Battery cell. Detailed Description of the Embodiment
[0024] The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present utility model, and are not used to limit the present utility model.
[0025] As Figure 1 , Figure 2 and Figure 3 shown, the present utility model provides a current collector plate 10, which is used for being welded and fixed to the end face of the battery cell 20. An annular concave surface 11 is formed by stamping on one side surface of the current collector plate 10 along its axial direction. An annular convex surface 12 corresponding to the annular concave surface 11 is formed on the other side surface of the current collector plate 10. The current collector plate 10 is welded and fixed to the end face of the battery cell 20 through the annular convex surface 12; liquid injection holes are provided on the current collector plate 10 inside and / or outside the annular concave surface 11, and the liquid injection holes are used for injecting electrolyte into the battery cell 20.
[0026] In the technical solution provided by the present utility model, an annular concave surface 11 is formed by stamping on one side surface of the current collector plate 10 along its axial direction, so that a corresponding annular convex surface 12 is formed on the other side surface of the current collector plate 10. The annular convex surface 12 is an annular continuous surface formed on the surface of the current collector plate 10, and it is used as a welding surface to be welded and fixed to the end face of the battery cell 20, effectively ensuring the welding strength between the current collector plate 10 and the end face of the battery cell 20. In addition, by providing liquid injection holes on the current collector plate 10 inside and / or outside the annular concave surface 11, and injecting electrolyte into the battery cell 20 through the liquid injection holes, it is possible to neither affect the liquid injection effect of the electrolyte nor ensure the welding strength between the current collector plate 10 and the end face of the battery cell 20.
[0027] It can be understood that, as Figure 2 shown, according to the current collector plate 10 provided by the present utility model, the central disk surface 14 located inside the annular concave surface 11 can be used as the welding area between the current collector plate 10 and the battery steel shell. After the current collector plate 10 is welded and fixed to the end face of the battery cell 20 through the annular convex surface 12, it is welded and fixed to the battery steel shell through the central disk surface 14. Exemplarily, the central disk surface 14 and the battery steel shell are welded and fixed by resistance welding.
[0028] It should be noted that in the present utility model, electrolyte can be injected into the battery cell 20 by providing liquid injection holes on the current collector plate 10 inside the annular concave surface 11 or by providing liquid injection holes on the current collector plate 10 outside the annular concave surface 11. It can be understood that simultaneously providing liquid injection holes on the current collector plate 10 inside and outside the annular concave surface 11 can effectively improve the liquid injection speed of the electrolyte and ensure the infiltration effect of the electrolyte in the battery cell 20. Therefore, this solution is a preferred solution.
[0029] In some embodiments, the liquid injection holes include a first liquid injection hole 111 and a second liquid injection hole 112. The first liquid injection hole 111 is provided on the current collector plate 10 inside the annular concave surface 11 and is set as a circular hole, and the second liquid injection hole 112 is provided on the current collector plate 10 outside the annular concave surface 11 and is set as an arc-shaped strip hole. As shown in combination with Figure 2 The arc-shaped strip hole has a higher electrolyte injection efficiency compared to the circular hole. In the present utility model, by setting the first liquid injection hole 111 inside the annular concave surface 11 as a circular hole, the structural strength of the current collector plate 10 is not affected, and by setting the second liquid injection hole 112 outside the annular concave surface 11 as an arc-shaped strip hole, the injection efficiency of the electrolyte can be ensured while the hole structure does not affect the structural strength of the current collector plate 10.
[0030] In some embodiments, a plurality of the first liquid injection holes 111 are provided, and the plurality of the first liquid injection holes 111 are evenly spaced around the center of the current collector plate 10. Through the above structural arrangement, not only can the injection efficiency of the electrolyte be ensured, but also the uniform infiltration of the electrolyte in the battery cell 20 can be ensured.
[0031] In some embodiments, a plurality of the second liquid injection holes 112 are provided, and the plurality of the second liquid injection holes 112 are evenly spaced around the center of the current collector plate 10. Through the above structural arrangement, not only can the injection efficiency of the electrolyte be ensured, but also the uniform infiltration of the electrolyte in the battery cell 20 can be ensured.
[0032] In the present utility model, the annular convex surface 12 can be welded and fixed to the end face of the battery cell 20 in any suitable form. In some embodiments, the annular convex surface 12 is welded and fixed to the end face of the battery cell 20 through a plurality of continuous weld marks 13.
[0033] In some embodiments, as shown in combination with Figure 4 The continuous weld marks 13 are arranged to extend along the radial direction of the current collector plate 10, and the plurality of continuous weld marks 13 are evenly spaced around the center of the current collector plate 10. The present utility model does not make special limitations on the trajectory of the continuous weld marks 13. For example, it can be a straight line type extending along the radial direction of the current collector plate 10. Preferably, the continuous weld marks 13 are in an "S" shape. The welding trajectory of this "S" shape can take into account the connection between the current collector plate 10 and the end face of the battery cell 20 in the radial and circumferential directions, thereby ensuring that the welding strength between the two meets the requirements.
[0034] In the present utility model, in order to ensure that the current collector plate 10 can be reliably welded and fixed to the end face of the battery cell 20 through the annular convex surface 12, the inner diameter of the annular concave surface 11 is 8 - 12 mm.
[0035] In some embodiments, the area of the annular concave surface 11 is greater than or equal to 45% of the total area of the current collector plate 10. Through the above arrangement, the area of the annular convex surface 12 corresponding to the annular concave surface 11 accounts for no less than 45% of the total area of the current collector plate 10, thereby ensuring the welding strength between the current collector plate 10 and the end face of the battery cell 20.
[0036] It should be noted that in the present utility model, the annular concave surface 11 is formed by stamping one side surface of the current collector plate 10 along its axial direction. If the stamping is too deep, it will affect the structural strength of the current collector plate 10, and in severe cases, it will cause the rupture of the current collector plate 10. If the stamping is too shallow, it will affect the liquid injection efficiency of the electrolyte. In some embodiments, the depth of the annular concave surface 11 is 50%-60% of the thickness of the current collector plate 10. Exemplarily, taking the thickness of the current collector plate 10 as 0.2 - 0.6 mm, the depth of the annular concave surface 11 is 0.1 - 0.36 mm.
[0037] The present utility model also provides a cylindrical full-tab battery, as Figure 5 shown. The cylindrical full-tab battery includes a battery cell 20 and the above-mentioned current collector plate 10, and the current collector plate 10 is welded and fixed on the end face of the battery cell 20. By using the cylindrical full-tab battery with the current collector plate 10 of the present utility model, while satisfying the liquid injection effect of the electrolyte, it can also ensure the welding strength between the current collector plate 10 and the battery cell 20, and ensure the realization of high-rate charge and discharge performance.
[0038] The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited thereto. Within the technical concept scope of the present utility model, various simple modifications can be made to the technical solutions of the present utility model. To avoid unnecessary repetition, the present utility model will not separately describe various possible combinations. But these simple modifications and combinations should also be regarded as the content disclosed by the present utility model and all fall within the protection scope of the present utility model.
Claims
1. A current collector plate (10) for welding and fixing to an end face of an electric core (20), characterized in that, On one side surface of the current collector plate (10), an annular concave surface (11) is formed by stamping along its axial direction. On the other side surface of the current collector plate (10), an annular convex surface (12) corresponding to the annular concave surface (11) is formed. The current collector plate (10) is fixedly welded to the end face of the battery cell (20) through the annular convex surface (12). Liquid injection holes are provided on the current collector plate (10) inside and / or outside the annular concave surface (11). The liquid injection holes are used to inject electrolyte into the battery cell (20).
2. The current collector tray (10) according to claim 1, characterized in that, The liquid injection holes include a first liquid injection hole (111) and a second liquid injection hole (112). The first liquid injection hole (111) is provided on the current collector plate (10) inside the annular concave surface (11) and is set as a circular hole. The second liquid injection hole (112) is provided on the current collector plate (10) outside the annular concave surface (11) and is set as an arc-shaped strip hole.
3. The current collector plate (10) according to claim 2, characterized in that, A plurality of the first liquid injection holes (111) are provided, and the plurality of the first liquid injection holes (111) are evenly spaced around the center of the current collector plate (10).
4. The current collector plate (10) according to claim 2, characterized in that, A plurality of the second liquid injection holes (112) are provided, and the plurality of the second liquid injection holes (112) are evenly spaced around the center of the current collector plate (10).
5. The current collector plate (10) according to claim 1, characterized in that, The annular convex surface (12) is fixedly welded to the end face of the battery cell (20) through a plurality of continuous welding marks (13).
6. The current collector plate (10) according to claim 5, characterized in that, The continuous welding marks (13) extend along the radial direction of the current collector plate (10), and the plurality of the continuous welding marks (13) are evenly spaced around the center of the current collector plate (10).
7. The current collector plate (10) according to claim 1, characterized in that, The inner diameter of the annular concave surface (11) is 8 - 12 mm.
8. The current collector tray (10) according to claim 1, characterized in that, The area of the annular concave surface (11) is greater than or equal to 45% of the total area of the current collector plate (10).
9. The current collector tray (10) according to claim 1, characterized in that, The depth of the annular concave surface (11) is 50% - 60% of the thickness of the current collector plate (10).
10. A cylindrical all-tab battery, characterized in that, It includes a battery cell (20) and the current collector plate (10) according to any one of claims 1 - 9. The current collector plate (10) is fixedly welded to the end face of the battery cell (20).