Cylindrical battery collector plate explosion point repairing patch

Abstract

A cylindrical battery collector plate explosion point repairing patch belongs to the technical field of cylindrical batteries and comprises a substrate layer and an adhesive layer. The repairing patch provided by the utility model is adhered to the surface of the collector plate of the explosion point battery, the explosion point battery does not need to be subjected to repair welding operation, the adhered collector plate patch becomes a qualified product after reworking, and the product scrap caused by welding explosion points of the collector plate is reduced; furthermore, the adhesive layer in the cylindrical battery is made of a corrosion-resistant material, so that explosion points can be effectively repaired, and electrolyte in the cylindrical battery is prevented from seeping out; and finally, the repairing patch is simple to use, and the complex technological process of reworking and repairing the cylindrical battery is avoided.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to a repair patch for a burst point on a cylindrical battery current collector. Background Technology

[0002] With the rapid development of new energy technologies, the application fields of lithium-ion batteries are constantly expanding. Cylindrical batteries have many advantages, such as good product consistency, strong heat dissipation, and long service life, making them one of the mainstream battery types.

[0003] The current collector is a crucial component of a cylindrical battery structure, primarily functioning to collect and discharge current from the core tabs. Current collector welding typically employs laser welding technology. Laser welding must not only ensure a complete and robust bond between the copper / aluminum foil and the current collector, but also guarantee the uniformity and density of the cell's internal structure. Simultaneously, it must prevent the accumulation of metallic foreign matter within the cell during the welding process. Laser welding is a major challenge affecting the yield and production efficiency of cylindrical batteries. Because current collectors are generally thin, welding can easily lead to a series of defects such as bursts, pinholes, dents, and cracks.

[0004] For cylindrical batteries with weld bursts in the current collector plate, a rework method involving localized repair, such as filler welding, is typically employed. First, the welded surface of the current collector plate needs to be treated with a file or fine sandpaper to seal the burst point. Then, the surface of the current collector plate is cleaned to remove dirt and impurities before the welding operation. However, the precision requirements for welding are extremely stringent. It is necessary to accurately control various welding parameters to prevent overheating at the welding location and ensure consistent weld depth and width, so as not to affect the strength of the weld joint and the overall performance of the cylindrical battery. Furthermore, the grinding process carries the risk of introducing foreign metal objects into the battery, posing a significant safety hazard. Utility Model Content

[0005] To address the high difficulty of repair welding after a burst point on the positive electrode current collector of a traditional cylindrical battery, this invention provides a repair patch for a burst point on the current collector of a cylindrical battery.

[0006] A repair patch for a burst point on a current collector of a cylindrical battery, the repair patch being adhered to the positive current collector of the cylindrical battery, comprising: a base layer and an adhesive layer;

[0007] The substrate layer and the adhesive layer are circular with a through hole in the center. The adhesive layer is attached to one side of the substrate layer and is bonded to the positive current collector of the cylindrical battery. The through hole corresponds to the electrolyte injection hole in the center of the current collector of the cylindrical battery.

[0008] Preferably, the base layer includes, but is not limited to, polypropylene, polyester, or polyimide.

[0009] Preferably, the thickness of the substrate layer is 25-40 μm.

[0010] Preferably, the adhesive layer is made of an electrolyte-resistant material, including but not limited to polyurethane acrylate.

[0011] Preferably, the thickness of the adhesive layer is 5-10 μm.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The technical solution provided by this utility model includes a base layer and an adhesive layer. The repair patch provided by this utility model is bonded to the surface of the current collector of the burst battery. The burst battery does not require re-welding. After rework, the bonded current collector patch becomes a qualified product, reducing product scrap caused by the current collector welding burst point. In addition, the adhesive layer in this utility model is a corrosion-resistant material, which can effectively repair the burst point and prevent electrolyte leakage from the inside of the cylindrical battery. Finally, the repair patch in this utility model is simple to use and avoids the complicated process of rework and repair of cylindrical batteries. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the repair patch of this utility model;

[0015] Figure 2 This is a schematic diagram of the through hole in the repair patch of this utility model;

[0016] Figure 3 This is a schematic diagram of the installation of the repair patch in this utility model;

[0017] Among them, 1-repair patch; 2-pole post; 3-winding core; 4-collector plate; 5-injection hole; 6-shell; 7-bottom cover plate; 8-explosion-proof valve; 101-base layer; 102-adhesive layer; 103-through hole. Detailed Implementation

[0018] To better understand this utility model, the following description, in conjunction with the accompanying drawings and examples, will further illustrate its contents.

[0019] This embodiment provides a repair patch for a burst point on the current collector of a cylindrical battery. The repair patch 1 is adhered to the positive current collector of the cylindrical battery. By attaching the repair patch to the surface of the current collector welding position of the burst point battery, the battery can be reworked, effectively sealing the burst point, preventing leakage that may occur in subsequent processes, reducing product scrap caused by the current collector welding burst point, and improving the production yield of cylindrical batteries. A cross-sectional schematic diagram of the repair patch 1 is shown below. Figure 1 As shown, it includes: a base layer 101 and an adhesive layer 102;

[0020] The base layer 101 and the adhesive layer 102 are circular, with a through hole 103 in the center, such as... Figure 2 As shown, the adhesive layer 102 is attached to one side of the substrate layer 101. The adhesive layer 102 is adhered to the positive current collector of the cylindrical battery. The through hole 103 corresponds to the electrolyte injection hole at the center of the current collector of the cylindrical battery. The installation diagram is shown below. Figure 3 As shown.

[0021] The base layer 101 includes, but is not limited to, polypropylene, polyester, or polyimide.

[0022] The thickness of the substrate layer 101 is 25-40 μm.

[0023] The adhesive layer 102 is made of an electrolyte-resistant material, including but not limited to polyurethane acrylate.

[0024] The adhesive layer 102 has a thickness of 5-10 μm.

[0025] In this embodiment, the base layer 101 can also be a hot melt adhesive, which can be directly hot melted and uniformly applied to the surface of the cylindrical battery current collector.

[0026] like Figure 3 As shown, the cylindrical battery body includes a casing 6 and a core 3. One end of the casing is connected to a terminal post 2 at its center, while the other end is open. The core 3 is placed inside the casing 6, and the core tab on the open side is welded to the current collector 4. A liquid injection hole 5 is located at the center of the current collector for injecting electrolyte. After the current collector 4 is welded, if a burst point occurs, a repair patch 1 (as described in this application) is bonded to the welded area on the outside of the current collector 4 of the burst point battery. The repair patch 1 has a circular through hole 103, the size of which is slightly larger than the size of the liquid injection hole in the current collector 4, to prevent the repair patch 1 from covering the liquid injection hole and hindering electrolyte injection. The bottom cover 7 has a disc-shaped structure with an annular flange perpendicular to the plane around its surface. The flanged part contacts and connects with the edge of the current collector 4 to seal the cylindrical battery body. An explosion-proof valve 8 is located at the center of the cover for pressure relief. The size of the repair patch 1 matches the appearance of the collector plate, the size of the welding part of the collector plate 1, and the plane size of the bottom cover plate 7, to ensure that the repair patch 1 can fit tightly with the collector plate and completely cover the weld marks, while not affecting the connection between the collector plate and the bottom cover plate 7.

[0027] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A repair patch for a burst point on a cylindrical battery current collector, wherein the repair patch (1) is pasted onto the positive current collector of the cylindrical battery, characterized in that, The repair patch (1) includes: a base layer (101) and an adhesive layer (102); The base layer (101) and the adhesive layer (102) are circular with a through hole (103) in the center. The adhesive layer (102) is attached to one side of the base layer (101) and is attached to the positive current collector of the cylindrical battery. The through hole (103) corresponds to the electrolyte injection hole in the center of the current collector of the cylindrical battery.

2. A repair patch for a burst point on a cylindrical battery current collector as described in claim 1, characterized in that, The base layer (101) includes, but is not limited to, polypropylene, polyester or polyimide.

3. A repair patch for a burst point on a cylindrical battery current collector as described in claim 1, characterized in that, The thickness of the substrate layer (101) is 25-40 μm.

4. A repair patch for a burst point on a cylindrical battery current collector as described in claim 1, characterized in that, The adhesive layer (102) is made of an electrolyte-resistant material, including but not limited to polyurethane acrylate.

5. A repair patch for a burst point on a cylindrical battery current collector as described in claim 1, characterized in that, The adhesive layer (102) has a thickness of 5-10 μm.

Images