A combination cap body
Patent Information
- Application Number
- CN202521894462.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-03
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-09-03
AI Technical Summary
[0003]现有技术中的锂电池，电池壳体一体成型，而后通过滚槽的方式与密封圈连接在一起，然而这种配合结构，在电池内部压力达到阈值时，电池的破点往往出现在壳体侧壁，不符合锂电池的安全规范
本实用新型的组合帽体，连接件的搭接环与连接本体的连接处开设有刻线以在刻线处打薄搭接环，这样，在电池内部压力达到阈值时，若防爆铝片不能及时泄压，电池壳体不会在壳体侧壁破裂，而是在搭接环被打薄的刻线处，搭接环会向外翻转或在刻线处断裂，从而使包括防爆铝片在内的组合帽体部分被整体推出锂电池的壳体，从而保证电池内部压力达到阈值时，电池的破点在电池的端部，以保证安全。
Smart Images
Figure CN224759485U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery technology, specifically a combined cap body. Background Technology
[0002] Lithium batteries have their own safety regulations. For example, when the internal pressure of the battery reaches a threshold, the failure point of the battery must be at the end of the battery, that is, the leakage point must be at the end of the battery.
[0003] In existing lithium batteries, the battery casing is integrally formed and then connected to the sealing ring by a rolling groove. However, with this fitting structure, when the internal pressure of the battery reaches the threshold, the failure point of the battery often occurs on the side wall of the casing, which does not meet the safety specifications of lithium batteries. Summary of the Invention
[0004] To address the technical problem in existing lithium batteries where the battery's internal pressure reaches a threshold, causing the battery to break at the sidewall of the casing, this application proposes a combined cap body that solves the aforementioned technical problem.
[0005] The technical solution adopted by this utility model to solve its technical problem is: This utility model provides a combined cap body for a lithium battery, comprising: an explosion-proof aluminum sheet; a sealing ring, the sealing ring enclosing the outer ring of the explosion-proof aluminum sheet; and a connector, the outer ring of the connector being fixedly connected to the lithium battery casing, the inner ring of the connector enclosing the sealing ring and riveting it to the explosion-proof aluminum sheet. The connector includes a connecting body, the inner ring of which has an overlapping ring and a riveting ring. The overlapping ring overlaps the side of the explosion-proof aluminum sheet facing the outside of the lithium battery, and a scribe line is provided at the connection between the overlapping ring and the connecting body to thin the overlapping ring at the scribe line. The riveting ring is riveted to the side of the explosion-proof aluminum sheet facing the inside of the lithium battery.
[0006] Furthermore, a step is formed on the outer ring of the connector to overlap with the end of the lithium battery casing. During assembly, the connector is inserted into the lithium battery casing until the step abuts against the end of the lithium battery casing, and then welding is performed at the step to connect the connector to the lithium battery casing.
[0007] Furthermore, before riveting, the riveting ring is perpendicular to the explosion-proof aluminum sheet. During riveting, the riveting ring is folded towards the center and a portion of the sealing ring is bent and pressed onto the explosion-proof aluminum sheet for complete riveting.
[0008] Furthermore, the end face of the connector facing the outside of the lithium battery is formed as the welding surface of the battery module.
[0009] Furthermore, a connecting ring is formed at the center of the explosion-proof aluminum sheet, and the transition between the outer ring of the explosion-proof aluminum sheet and the connecting ring is pressed and thinned to form an explosion-proof groove.
[0010] Furthermore, it also includes a connecting aluminum sheet disposed on the side of the explosion-proof aluminum sheet facing the inside of the lithium battery, the central region of the connecting aluminum sheet being connected to the connecting ring of the explosion-proof aluminum sheet.
[0011] Furthermore, the connecting aluminum sheet is provided with an isolation ring to isolate the portion of the connecting aluminum sheet outside the central area from the explosion-proof aluminum sheet.
[0012] Furthermore, it also includes a steel cap, wherein a positioning groove is formed on the side of the explosion-proof aluminum sheet facing the outside of the lithium battery, and the positioning groove is used to position and connect the steel cap.
[0013] Based on the above technical solution, the technical effects that this utility model can achieve are as follows: The combined cap body of this utility model has a etched line at the connection between the overlapping ring of the connector and the connecting body to thin the overlapping ring at the etched line. In this way, when the internal pressure of the battery reaches the threshold, if the explosion-proof aluminum sheet cannot release the pressure in time, the battery shell will not break at the side wall of the shell. Instead, at the etched line where the overlapping ring is thinned, the overlapping ring will flip outward or break at the etched line. This allows the combined cap body, including the explosion-proof aluminum sheet, to be pushed out of the lithium battery shell as a whole. This ensures that when the internal pressure of the battery reaches the threshold, the break point of the battery is at the end of the battery, thus ensuring safety. Attached Figure Description
[0014] Fig. 1 This is a schematic diagram of the combined cap body of this utility model; Fig. 2 This is a schematic diagram of the connecting body of the combined cap body of this utility model before riveting.
[0015] Wherein: 1-Explosion-proof aluminum sheet, 11-Connecting ring, 12-Explosion-proof groove, 13-Positioning groove; 2-Sealing ring; 3-Connecting piece, 31-Connecting body, 32-Overlapping ring, 33-Engraved line, 34-Riveting ring, 35-Step, 36-Welding surface; 4-Shell; 5-Connecting aluminum sheet; 6-Isolation ring; 7-Steel cap. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0017] like Figs. 1-2 As shown, this utility model provides a combined cap body, including an explosion-proof aluminum sheet 1, a sealing ring 2, and a connector 3. The sealing ring 2 surrounds the outer ring of the explosion-proof aluminum sheet 1. The outer ring of the connector 3 is fixedly connected to the shell 4 of the lithium battery. The inner ring of the connector 3 surrounds the sealing ring 2 and is riveted to the explosion-proof aluminum sheet 1. The connector 3 includes a connecting body 31. An overlapping ring 32 and a riveting ring 34 are formed on the inner ring of the connecting body 31. The overlapping ring 32 overlaps on the side of the explosion-proof aluminum sheet 1 facing the outside of the lithium battery. A scribe line 33 is provided at the connection between the overlapping ring 32 and the connecting body 31 to thin the overlapping ring 32 at the scribe line 33. The riveting ring 34 is riveted to the side of the explosion-proof aluminum sheet 1 facing the inside of the lithium battery.
[0018] In this utility model, the connecting ring 32 of the connector 3 and the connecting body 31 are connected by a scribe line 33 to thin the connecting ring 32 at the scribe line 33. In this way, when the internal pressure of the battery reaches the threshold, if the explosion-proof aluminum sheet 1 cannot release the pressure in time, the battery shell 4 will not break at the side wall of the shell 4. Instead, the connecting ring 32 will flip outward or break at the scribe line 33 where it is thinned. This allows the combined cap body, including the explosion-proof aluminum sheet 1, to be pushed out of the lithium battery shell 4 as a whole. This ensures that when the internal pressure of the battery reaches the threshold, the break point of the battery is at the end of the battery, thus ensuring safety. It should be noted that the connector 3 is manufactured separately instead of being integrally formed from the lithium battery shell 4. If an integral forming process is used, the manufacturing difficulty will increase, and the scribe line 33 on the connecting ring 32 will cause severe deformation of the connecting ring 32.
[0019] In one specific embodiment of the present invention, a step 35 is formed on the outer ring of the connector 3 to overlap with the end of the lithium battery housing 4. During assembly, the connector 3 is inserted into the lithium battery housing 4 until the step 35 abuts against the end of the lithium battery housing 4, and then welding is performed at the step 35 to connect the connector 3 to the lithium battery housing 4.
[0020] In one specific embodiment of this utility model, before riveting, the riveting ring 34 is perpendicular to the explosion-proof aluminum sheet 1. During riveting, the riveting ring 34 is folded towards the center and the sealing ring 2 is partially bent and pressed onto the explosion-proof aluminum sheet 1 for complete riveting.
[0021] Compared to the previous lithium battery without connector 3, the end face of connector 3 facing the outside of the lithium battery is formed as the welding surface 36 of the battery module. The shell obtains more welding surface 36 area by thickening connector 3 to facilitate the subsequent welding of the battery module.
[0022] In one specific embodiment of this utility model, a connecting ring 11 is formed at the center of the explosion-proof aluminum sheet 1, and the transition between the outer ring of the explosion-proof aluminum sheet 1 and the connecting ring 11 is squeezed and thinned to form an explosion-proof groove 12, thereby releasing pressure when the internal pressure of the battery increases.
[0023] In one specific embodiment of the present invention, a connecting aluminum sheet 5 is further included on the side of the explosion-proof aluminum sheet 1 facing the inside of the lithium battery, and the central area of the connecting aluminum sheet 5 is connected to the connecting ring 11 of the explosion-proof aluminum sheet 1.
[0024] In one specific embodiment of this utility model, an isolation ring 6 is provided on the connecting aluminum sheet 5 to isolate the part outside the central area of the connecting aluminum sheet 5 from the explosion-proof aluminum sheet 1.
[0025] In one specific embodiment of this utility model, a steel cap 7 is also included. A positioning groove 13 is formed on the side of the explosion-proof aluminum sheet 1 facing the outside of the lithium battery. The positioning groove 13 is used to position and connect the steel cap 7.
[0026] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.
Claims
1. A combination cap for a lithium battery, characterized by, The utility model relates to a lithium battery explosion -proof aluminum sheet, including: Explosion -proof aluminum sheet (1); Sealing ring (2), the sealing ring (2) is enveloped in the outer ring of explosion -proof aluminum sheet (1); Connecting piece (3), the outer ring of connecting piece (3) is fixedly connected with the shell (4) of lithium battery, the inner ring of connecting piece (3) is enveloped and riveted on explosion -proof aluminum sheet (1), and connecting piece (3) includes connecting body (31), and the inner ring of connecting body (31) is formed with lap joint ring (32) and riveting ring (34), lap joint ring (32) is overlapped on the one side of explosion -proof aluminum sheet (1) towards lithium battery outside, and the connecting place of lap joint ring (32) and connecting body (31) is provided with score line (33) to thin the lap joint ring (32) at score line (33), and riveting ring (34) is riveted on the one side of explosion -proof aluminum sheet (1) towards lithium battery inside.
2. The combination cap of claim 1, wherein The outer ring of connecting piece (3) is formed with the step (35) of lap joint with the end of the shell (4) of lithium battery, when assembling, connecting piece (3) is inserted into the shell (4) of lithium battery until the step (35) abuts to the end of the shell (4) of lithium battery, and welding is carried out at step (35) to make connecting piece (3) connect on the shell (4) of lithium battery.
3. The combination cap of claim 1, wherein Before riveting, riveting ring (34) is perpendicular to explosion -proof aluminum sheet (1), when riveting, riveting ring (34) is folded towards the center of a circle and is complete riveting after being pressed together on explosion -proof aluminum sheet (1) after the part of sealing ring (2) is bent.
4. The combination cap of claim 1, wherein The end face of connecting piece (3) towards lithium battery outside is formed as the welding surface (36) of battery module.
5. The combination cap of claim 1, wherein The center of explosion -proof aluminum sheet (1) is formed with connecting ring (11), and the transition of the outer ring of explosion -proof aluminum sheet (1) and connecting ring (11) is extruded and thinned to form explosion -proof groove (12).
6. The combination cap of claim 5, wherein, Still include the connecting aluminum sheet (5) arranged on the one side of explosion -proof aluminum sheet (1) towards lithium battery inside, and the central region of connecting aluminum sheet (5) is connected on the connecting ring (11) of explosion -proof aluminum sheet (1).
7. The combination cap of claim 6, wherein, Connecting aluminum sheet (5) is provided with isolation ring (6) to isolate the part outside the central region of connecting aluminum sheet (5) with explosion -proof aluminum sheet (1).
8. The combination cap of claim 1, wherein Still include steel cap (7), and the one side of explosion -proof aluminum sheet (1) towards lithium battery outside is formed with positioning groove (13), and positioning groove (13) is used to position connecting steel cap (7).