Cover and film integrated secondary battery cover plate
By designing a secondary battery cover with an integrated cover film, using stamping thinner and reinforcement methods, the problems of complex welding of lithium-ion battery explosion-proof films are solved, and the effect of saving manufacturing costs and improving production efficiency is achieved. .
Patent Information
- Application Number
- CN202420902650.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The explosion-proof measures of existing lithium-ion batteries are equipped with explosion-proof membranes and pressure relief explosion-proof valves on the combined cover plate, which makes welding complex and difficult to ensure air tightness. It requires hole-punching and welding first, which increases manufacturing cost and detection difficulty.
Design a secondary battery cover plate with a cover film, forming an explosion-proof film by stamping and thinning the cover plate body, and stamping the explosion-proof film around it to reserve the explosion-proof film hanging point, and the middle area is protruding upwards and arc-shaped. The reinforcement ribs are stamped upwards as a whole, with the sides of the slope or step surfaces. The corresponding welding method is adopted to reduce welding and airtightness detection processes.
Direct stamping of explosion-proof film saves manufacturing costs, reduces process steps, improves production efficiency and product yield, and enhances the strength and breathing test performance of explosion-proof film.
Smart Images
Figure CN222300797U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery cover plates, in particular to a secondary battery cover plate with an integrated cover film. Background Art
[0002] Lithium-ion batteries are used more and more. When a large amount of gas is generated inside a lithium-ion battery due to unexpected situations such as short circuit, high temperature, overcharging, etc., if the pressure is not released in time, it will cause the battery to explode and cause a safety accident. At present, the explosion-proof measures commonly used in lithium-ion batteries are equipped with an explosion-proof membrane on the combined cover plate, and accessories are added to form a pressure relief explosion-proof valve. The explosion-proof structure is complicated and requires drilling first, and the explosion-proof membrane is placed and welded to the cover plate. The airtightness between the explosion-proof membrane and the cover plate is difficult to guarantee, and airtightness testing is also required.
[0003] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a secondary battery cover with an integrated cover film. Utility Model Content
[0004] The main technical problem solved by the utility model is to provide a secondary battery cover plate with an integrated cover film, reduce the process technology of cover plate assembly welding and air tightness detection, save the manufacturing cost of explosion-proof membrane, and effectively increase production efficiency and product yield.
[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a secondary battery cover plate with an integrated cover film, the secondary battery cover plate with an integrated cover film includes a cover plate body, the cover plate body is provided with a positive pole hole, an injection hole and a negative pole hole, the middle area of the cover plate body is punched and thinned to form an explosion-proof membrane, a circle of bursting ribs are punched around the explosion-proof membrane to facilitate the explosion, and an explosion-proof membrane hanging point is reserved on the bursting rib to prevent the explosion-proof membrane from flying away, and the middle area of the explosion-proof membrane bulges upward in an arc shape.
[0006] Preferably, the explosion-proof membrane has a thickness of 0.1 to 0.4 mm.
[0007] Preferably, the cover plate body is integrally punched with a convex bump or a circle of reinforcing ribs upward.
[0008] Preferably, the lower side of the cover body is an inclined surface or a stepped surface. The cover body with an inclined side is welded to the battery body by vertical welding, and the cover body with a stepped side is welded to the battery body by side welding.
[0009] Preferably, the positive electrode column hole and the negative electrode column hole are through holes, or a circle of steps are punched around the through holes.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] (1) The explosion-proof membrane is directly stamped on the cover plate, which can save the manufacturing cost of the explosion-proof membrane;
[0012] (2) Reduce the manufacturing process of the cover plate assembly, which is specifically reflected in the welding of the cover plate and the explosion-proof membrane and the airtightness detection of the cover plate and the explosion-proof membrane, saving the processing cost of the laser welding membrane and increasing the internal space of the battery;
[0013] (3) As mentioned in the previous two points, reducing the process can effectively increase production efficiency and product yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The figure is a structural schematic diagram of a secondary battery cover plate with an integrated cover film.
[0015] Figure 2 The figure is a cross-sectional view of a secondary battery cover plate with an integrated cover film.
[0016] Figure 3 This is a partial enlarged view of the explosion-proof membrane of a secondary battery cover with an integrated cover and membrane.
[0017] Figure 4 The diagram is a schematic diagram of the back side of an explosion-proof membrane of a secondary battery cover with an integrated cover and membrane.
[0018] Figure 5 Schematic diagrams of different implementations of a secondary battery cover plate with an integrated cover film.
[0019] Among them, 00, cover body, 01, convex hull, 02, reinforcing rib, 03, inclined surface, 04, step surface, 05, through hole, 06, step, 1, positive pole hole, 2, injection hole, 3, negative pole hole, 4, explosion-proof membrane, 5, bursting rib, 6, explosion-proof membrane hanging point. DETAILED DESCRIPTION
[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0021] See also Figures 1 to 5 , the utility model embodiment includes:
[0022] A secondary battery cover with a cover film integrated therein, the secondary battery cover with a cover film integrated therein comprises a cover body 00, the cover body 00 is provided with a positive pole hole 1, a liquid injection hole 2 and a negative pole hole 3, the middle area of the cover body 00 is punched and thinned to form an explosion-proof membrane 4, the thickness of the explosion-proof membrane 4 is 0.1 to 0.4 mm, and a circle of bursting ribs 5 are punched around the explosion-proof membrane 4 to facilitate bursting therein, and an explosion-proof membrane hanging point 6 is reserved on the bursting rib 5 to burst from the explosion rib 5, (i.e., the explosion-proof membrane hanging point 6 is not punched) The explosion-proof membrane hanging point 6 is set to retain the exploded explosion-proof membrane 4. If the explosion-proof membrane hanging point 6 is not set, it will explode all of a sudden. The internal pressure will be so high that the entire explosion-proof membrane 4 will explode and fly from the explosion-proof rib 5, which will cause a safety hazard. The middle area of the explosion-proof membrane 4 is convex upward in an arc shape. Compared with the flat explosion-proof membrane, the arc-shaped explosion-proof membrane has good strength. In the process of punching and thinning to prepare the explosion-proof membrane 4, the material in the thinning area can be squeezed into the arc-shaped area, which increases the strength again, which can effectively increase the strength of the explosion-proof membrane and improve the breathing test performance of the explosion-proof membrane.
[0023] The cover plate body 00 is integrally punched with a convex bump 01 or a circle of reinforcing ribs 02, which can effectively increase the overall strength of the cover plate and appropriately reduce the thickness of the cover plate, thereby achieving the purpose of reducing cost and weight.
[0024] The lower part of the side surface of the cover plate body 00 is an inclined surface 03 or a step surface 04. The cover plate body 00 with the inclined surface 03 at the lower part of the side surface is welded to the battery body by vertical welding, that is, it is welded downward from the top of the cover plate body 00. The cover plate body 00 with the step surface 04 at the lower part of the side surface is welded to the battery body by side welding, that is, it is welded horizontally from the outer side of the battery body.
[0025] The positive electrode post hole 1 and the negative electrode post hole 3 are formed as through holes 05, or a circle of steps 06 are punched around the through holes to increase the local strength of the cover plate. The specific implementation scheme can be appropriately adjusted according to customer requirements.
[0026] The utility model discloses a secondary battery cover plate with integrated cover film, wherein the explosion-proof film and the cover plate are integrated into one design, which reduces the process of welding the cover plate assembly and air tightness testing, saves the manufacturing cost of the explosion-proof film, and effectively increases the production efficiency and product yield.
[0027] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A secondary battery cover with integrated cover film, comprising a cover body, wherein the cover body is provided with a positive pole hole, a liquid injection hole and a negative pole hole, and wherein: The middle area of the cover plate body is punched and thinned to form an explosion-proof membrane, a circle of blasting ribs are punched around the explosion-proof membrane to facilitate explosion, and an explosion-proof membrane hanging point is reserved on the blasting rib to prevent the explosion-proof membrane from flying away. The middle area of the explosion-proof membrane bulges upward in an arc shape.
2. The secondary battery cover plate with integrated cover film according to claim 1, characterized in that: The explosion-proof membrane has a thickness of 0.1 to 0.4 mm.
3. The secondary battery cover plate with integrated cover film according to claim 1, characterized in that: The cover plate body is integrally punched with a convex bump or a circle of reinforcing ribs upward.
4. The secondary battery cover plate with integrated cover film according to claim 1, characterized in that: The lower part of the side surface of the cover plate body is an inclined surface or a stepped surface. The cover plate body with an inclined side surface is welded to the battery body by vertical welding, and the cover plate body with a stepped side surface is welded to the battery body by side welding.
5. The secondary battery cover plate with integrated cover film according to claim 1, characterized in that: The positive pole post hole and the negative pole post hole are through holes, or a circle of steps are punched around the through holes.