Connecting structure for preventing liquid leakage and lithium battery combined cap
By designing a connection structure to prevent liquid leakage between the explosion-proof aluminum sheet and the steel cap of the lithium battery combination cap, the electrolyte leakage path is increased by using the bearing groove and the flange lower buckle, and filling the sealant to improve the sealing property, the problem of liquid leakage of lithium battery combination caps in the prior art is solved, and a higher sealing ability and a multi-pole ear process adapted to high-speed batteries is achieved.
Patent Information
- Application Number
- CN202421486585.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing lithium battery combination caps are prone to liquid leakage due to the gap between the steel cap and the explosion-proof aluminum plate.
A connection structure to prevent leakage was designed. By configuring a bearing groove and a flip lower buckle between the explosion-proof aluminum sheet and the steel cap, the path of the electrolyte leak was increased, and sealant was filled in the bearing groove to improve sealing.
It effectively reduces the risk of liquid leakage, improves the sealing of the battery, and increases the storage space for extreme ears, and is suitable for multi-pole ear processes of high-speed batteries.
Smart Images
Figure CN222867842U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, in particular to a connection structure for preventing liquid leakage and a lithium battery assembly cap. Background Art
[0002] The lithium battery combination cap is one of the key components of lithium batteries, and is mainly responsible for the sealing, protection and safety functions of the battery. The lithium battery combination cap, also known as the battery cap or simply the combination cap, is a vital part of the lithium battery. It not only provides the positive electrode interface of the battery, but also bears the responsibility of protecting the battery from external influences and preventing the leakage of internal substances. However, the existing half-pack structure cap is prone to leakage due to the gap between the steel cap and the explosion-proof aluminum sheet. Utility Model Content
[0003] In order to solve the technical problem that the lithium battery combination cap in the prior art is prone to leakage due to the gap between the steel cap and the explosion-proof aluminum sheet, the present application proposes a connection structure and a lithium battery combination cap that prevents leakage, which solves the above technical problem.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] One aspect of the utility model provides a connection structure to prevent leakage, which is arranged between an explosion-proof aluminum sheet and a steel cap. The outer ring of the explosion-proof aluminum sheet is folded multiple times to form a side protruding toward the inside of the battery, and the other side is provided with a sunken portion of a receiving groove to increase the flow path of the electrolyte inside the lithium battery. The outer periphery of the steel cap forms a flanged lower buckle, and the flanged lower buckle is inserted into the receiving groove to complete the assembly connection between the explosion-proof aluminum sheet and the steel cap.
[0006] Furthermore, the receiving groove is filled with sealant.
[0007] Furthermore, the sealant is coated on the bottom of the receiving groove.
[0008] Furthermore, the outermost circle of the folded explosion-proof aluminum sheet is bent downward toward the flange of the steel cap to form a closed end.
[0009] Another aspect of the utility model provides a lithium battery assembly cap, comprising the above-mentioned connection structure for preventing liquid leakage.
[0010] Furthermore, the lithium battery combination cap also includes: a connecting aluminum sheet, one side of the connecting aluminum sheet is connected to the pole ear inside the lithium battery, and the middle area of the other side is connected to the explosion-proof aluminum sheet; an isolating member, the isolating member is arranged on the outer circle of the connecting aluminum sheet and the explosion-proof aluminum sheet; a sealing member, the sealing member is arranged on the periphery of the connection structure to prevent leakage so as to envelope the outer circle of the explosion-proof aluminum sheet.
[0011] Based on the above technical solution, the technical effects that can be achieved by the utility model are:
[0012] The utility model discloses a connection structure for preventing liquid leakage, which is arranged between the explosion-proof aluminum sheet and the steel cap. The steel cap is made into a flanged and buckled part, and the explosion-proof aluminum sheet is made into a sunken part. The two are buckled together, thereby increasing the path of electrolyte leakage, thereby reducing the risk of leakage rate, and solving the technical problem that the lithium battery combination cap in the prior art is prone to liquid leakage due to the gap between the steel cap and the explosion-proof aluminum sheet. In addition, the overlapping thickness of the connection between the steel cap and the explosion-proof aluminum sheet in this design is reduced, thereby increasing the space for storing the pole ear, so that the high-rate battery can adopt a multi-pole ear process.
[0013] The connection structure for preventing liquid leakage of the utility model further reduces the risk of liquid leakage by adding a glue coating process in the receiving groove of the sinking part of the explosion-proof aluminum sheet, thereby improving the sealing performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the connection structure for preventing leakage and the lithium battery assembly cap of the utility model;
[0015] Figure 2 It is a schematic diagram of the connection structure for preventing liquid leakage and the connection aluminum sheet of the lithium battery assembly cap of the utility model.
[0016] In the utility model: 1-explosion-proof aluminum sheet, 11-receiving groove, 12-sinking part, 13-closing; 2-steel cap, 21-flange buckle; 3-sealant; 4-connecting aluminum sheet; 5-isolating member; 6-sealing member. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0018] like Figure 1-2 As shown, the utility model provides a connection structure to prevent leakage, which is arranged between an explosion-proof aluminum sheet 1 and a steel cap 2. The outer ring of the explosion-proof aluminum sheet 1 is folded multiple times to form a side protruding toward the inside of the battery, and the other side is provided with a sinking portion 12 of a receiving groove 11 to increase the flow path of the electrolyte inside the lithium battery. The outer periphery of the steel cap 2 forms a flanged lower buckle 21, which is inserted into the receiving groove 11 to complete the assembly connection between the explosion-proof aluminum sheet 1 and the steel cap 2.
[0019] The connection structure for preventing liquid leakage of the utility model is arranged between the explosion-proof aluminum sheet 1 and the steel cap 2. By making the steel cap 2 into a flanged lower buckle 21 and the explosion-proof aluminum sheet 1 into a sinking part 12, the two are buckled together, thereby increasing the path of electrolyte leakage, thereby reducing the risk of leakage rate, and solving the technical problem that the lithium battery combination cap in the prior art is prone to liquid leakage due to the gap between the steel cap 2 and the explosion-proof aluminum sheet 1. In addition, in this design, the overlapping thickness of the connection between the steel cap 2 and the explosion-proof aluminum sheet 1 is reduced, and the space for storing the pole ear is increased, so that the high-rate battery can adopt a multi-pole ear process.
[0020] In a specific embodiment of the present invention, the receiving groove 11 is filled with a sealant 3 .
[0021] Furthermore, the sealant 3 is coated on the bottom of the receiving groove 11 .
[0022] In a specific embodiment of the present invention, the outermost circle of the folded explosion-proof aluminum sheet 1 is bent toward the flange lower buckle 21 of the steel cap 2 to form a closed opening 13 .
[0023] Another aspect of the utility model provides a lithium battery assembly cap, comprising the above-mentioned connection structure for preventing liquid leakage.
[0024] Furthermore, the lithium battery combination cap of the utility model also includes a connecting aluminum sheet 4, an isolating member 5 and a sealing member 6. One side of the connecting aluminum sheet 4 is connected to the pole ear inside the lithium battery, and the middle area of the other side is connected to the explosion-proof aluminum sheet 1. The isolating member 5 is arranged on the outer circle of the connecting aluminum sheet 4 and the explosion-proof aluminum sheet 1, and the sealing member 6 is arranged on the periphery of the connection structure for preventing liquid leakage so as to envelop the outer circle of the explosion-proof aluminum sheet 1.
[0025] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.
Claims
1. A connection structure for preventing liquid leakage, arranged between an explosion-proof aluminum sheet (1) and a steel cap (2), characterized in that: The outer ring of the explosion-proof aluminum sheet (1) is folded multiple times to form a side that bulges toward the inside of the battery, and the other side is provided with a sinking portion (12) of a receiving groove (11) to increase the flow path of the electrolyte inside the lithium battery. The outer periphery of the steel cap (2) forms a flanged lower buckle (21), and the flanged lower buckle (21) is inserted into the receiving groove (11) to complete the assembly connection between the explosion-proof aluminum sheet (1) and the steel cap (2).
2. The connection structure for preventing liquid leakage according to claim 1, characterized in that: The receiving groove (11) is filled with sealant (3).
3. The connection structure for preventing liquid leakage according to claim 2, characterized in that: The sealant (3) is coated on the bottom of the receiving groove (11).
4. The connection structure for preventing liquid leakage according to claim 1, characterized in that: The outermost circle of the folded explosion-proof aluminum sheet (1) is bent toward the flanged lower buckle (21) of the steel cap (2) to form a closed opening (13).
5. A lithium battery assembly cap, characterized in that: It comprises a connection structure for preventing liquid leakage as described in any one of claims 1 to 4.
6. The lithium battery assembly cap according to claim 5, characterized in that: Also includes: A connecting aluminum sheet (4), wherein one side of the connecting aluminum sheet (4) is connected to a pole ear inside the lithium battery, and the middle area of the other side is connected to the explosion-proof aluminum sheet (1); An isolating member (5), the isolating member (5) being arranged on the outer ring of the connecting aluminum sheet (4) and the explosion-proof aluminum sheet (1); A sealing member (6) is arranged on the periphery of the connection structure for preventing liquid leakage so as to envelop the outer ring of the explosion-proof aluminum sheet (1).