End cover structure and battery
By designing the welding strength between the explosion-proof parts and the end cap body in the battery end cap structure is smaller than that of the battery case, the problems of many parts and low production efficiency in the prior art are solved, and safety and production efficiency are improved.
Patent Information
- Application Number
- CN202421861467.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing battery end cap structure uses a split structure between the explosion-proof valve and the end cap, resulting in large quantities of parts, high production costs and low efficiency.
An end cap structure is designed, wherein the explosion-proof member and the end cap body are fixed by welding, and the welding strength is less than the strength between the end cap body and the battery housing, so as to first rupture and relieve pressure when the internal pressure of the battery increases, so as to prevent the end cap from falling off.
It achieves the improvement of production efficiency while reducing production costs, and ensures battery safety and pressure relief.
Smart Images
Figure CN223092977U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery technologies, and in particular, to an end cap structure and a battery. Background Art
[0002] During the use of a battery, a large amount of gas is generated after thermal runaway inside the battery, which increases the pressure inside the battery and causes the end cap of the battery to fall off, posing a safety hazard. Therefore, an explosion-proof valve is usually provided on the end cap of the battery, and safety pressure relief is carried out through the explosion-proof valve to improve the safety performance of the battery. In the existing end cap structure of the battery, the explosion-proof valve and the end cap adopt a split structure, resulting in a large number of parts of the explosion-proof valve, high production costs, and laborious and time-consuming production, with low production efficiency. Summary of the Utility Model
[0003] The present disclosure provides an end cap structure and a battery to at least solve the above problems in the prior art.
[0004] To achieve the above object, the present disclosure provides the following technical solution: An end cap structure, comprising:
[0005] An end cap main body configured with an explosion-proof port, the explosion-proof port penetrating through the end cap main body, and the end cap main body being used for welding to an external battery housing;
[0006] An explosion-proof member covering the explosion-proof port and fixedly welded to the end cap main body, the welding strength between the explosion-proof member and the end cap main body being less than the welding strength between the end cap main body and the external battery housing.
[0007] In an implementable embodiment, the explosion-proof member and the explosion-proof port have the same shape and are both in an oval structure.
[0008] In an implementable embodiment, the welding fusion width between the explosion-proof member and the end cap main body is 0.8 mm - 1.2 mm.
[0009] In an implementable embodiment, the welding fusion depth between the explosion-proof member and the end cap main body is 0.4 mm - 0.5 mm.
[0010] In an implementable embodiment, the number of the explosion-proof members is the same as that of the explosion-proof ports, each explosion-proof member covering a corresponding one of the explosion-proof ports, and the plurality of explosion-proof ports being spaced apart and arranged on the end cap main body.
[0011] In an implementable embodiment, the end cap main body includes:
[0012] An end cap substrate configured with a liquid injection hole, the liquid injection hole penetrating through the end cap substrate;
[0013] A sealing nail is inserted into the liquid injection hole and used to seal the liquid injection hole.
[0014] In an implementable embodiment, a welding groove is further disposed on one side of the end cap substrate, and the end cap structure further includes a bus bar. The bus bar is disposed on the other side of the end cap substrate and is fixedly welded to the end cap body at the welding groove.
[0015] In an implementable embodiment, the number of the welding grooves is multiple, and the multiple welding grooves are circumferentially spaced with the center line of the end cap substrate as the axis.
[0016] In an implementable embodiment, the shape of the welding groove is an arc-shaped structure.
[0017] The present disclosure also provides the following technical solution: a battery, which includes the end cap structure described in any one of the above.
[0018] In the above end cap structure, first, an explosion-proof port is opened on the end cap body, then an explosion-proof member is covered on the explosion-proof port, and the explosion-proof member is fixedly welded to the end cap body. And the welding strength between the explosion-proof member and the end cap body is less than the welding strength between the end cap body and the external battery housing, so that when the pressure in the housing increases to the critical value, the pressure in the housing will first break through the explosion-proof member and release pressure through the explosion-proof port, rather than causing the end cap to fall off from the housing; thus, by designing the welding strength between the explosion-proof member and the end cap body to be less than the welding strength between the end cap body and the external battery housing, the explosion-proof effect can be achieved, and the end cap structure is simple and easy to produce and process, thereby improving the production efficiency on the basis of reducing the production cost.
[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] By referring to the drawings and reading the following detailed description, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become easily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, where:
[0021] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.
[0022] Figure 1 shows a front view structural schematic diagram of the end cap structure in the embodiment of the present disclosure;
[0023] Figure 2 shows Figure 1 a partial structural schematic diagram of the end cap structure in
[0024] Figure 3 shows a Figure 1 cross-sectional view of the middle end cover structure along the III-III direction;
[0025] Figure 4 shows a Figure 3 magnified view of local area IV in the figure.
[0026] Explanation of reference numerals in the figure:
[0027] In the figure: 10, end cover structure; 11, end cover main body; 111, end cover substrate; 112, sealing nail; 113, explosion-proof port; 114, welding groove; 115, liquid injection hole; 12, explosion-proof part; 13, bus bar. Specific implementation manners
[0028] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present disclosure.
[0029] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions of the present disclosure can be achieved, and no limitations are imposed herein.
[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically defined.
[0031] The following will be described in conjunction with the accompanying drawings for the embodiments provided by the present utility model.
[0032] Please refer to Figure 1 and Figure 2, an embodiment of the present disclosure provides an end cap structure 10, which includes an end cap body 11 and an explosion-proof member 12. The end cap body 11 is configured with an explosion-proof port 113 that penetrates through the end cap body 11. The end cap body 11 is used to be welded to an external battery case. The explosion-proof member 12 covers the explosion-proof port 113 and is fixed to the end cap body 11 by welding. The welding strength between the explosion-proof member 12 and the end cap body 11 is less than the welding strength between the end cap body 11 and the external battery case; specifically, the explosion-proof member 12 is a sheet structure formed by stamping or cutting, and the structure of the explosion-proof member 12 is simple and easy to process.
[0033] In the above end cap structure 10, first, an explosion-proof port 113 is opened on the end cap body 11, then the explosion-proof member 12 is covered on the explosion-proof port 113, and the explosion-proof member 12 is fixed to the end cap body 11 by welding, and the welding strength between the explosion-proof member 12 and the end cap body 11 is less than the welding strength between the end cap body 11 and the external battery case, so that when the pressure in the case increases to the critical value, the pressure in the case will first break through the explosion-proof member 12 and relieve pressure through the explosion-proof port 113, rather than causing the end cap structure 10 to fall off from the case; thus, by designing the welding strength between the explosion-proof member 12 and the end cap body 11 to be less than the welding strength between the end cap body 11 and the external battery case, the explosion-proof effect can be achieved, and the end cap structure 10 is simple and easy to produce and process, thereby improving the production efficiency on the basis of reducing the production cost.
[0034] It can be understood that the pressure value required for the battery to break through the welding joint between the explosion-proof member 12 and the end cap body 11 is the explosion-proof pressure value. The explosion-proof pressure value in the battery can be set by the welding strength between the explosion-proof member 12 and the end cap body 11, and the welding strength is set by the welding width and welding depth.
[0035] Please refer to Figure 3 and Figure 4 , in some embodiments, the welding width between the explosion-proof member 12 and the end cap body 11 is A, where the range of A is 0.8 mm - 1.2 mm. When the value of A is less than 0.8 mm, the welding strength between the explosion-proof member 12 and the end cap body 11 is too low, and the connection strength between the explosion-proof member 12 and the end cap body 11 is weak. The explosion-proof member 12 and the end cap body 11 are directly prone to cracking under shaking or accidental external contact, resulting in an increase in the defective rate of the product. When the value of A is greater than 1.2 mm, the welding strength between the explosion-proof member 12 and the end cap body 11 is too high, and it is easy to cause the explosion-proof member 12 to still not break and relieve pressure when the pressure value in the battery case reaches the explosion-proof pressure value, affecting safety. When the value of A is in the range of 0.8 mm - 1.2 mm, the safety can be improved on the basis of ensuring the product qualification rate.
[0036] The welding penetration depth between the explosion-proof part 12 and the end cover main body 11 is B, and the range of B is 0.4 mm - 0.5 mm. Among them, when the value of B is less than 0.4 mm, the welding strength between the explosion-proof part 12 and the end cover main body 11 is too low, and the connection strength between the explosion-proof part 12 and the end cover main body 11 is weak. The explosion-proof part 12 and the end cover main body 11 are directly prone to cracking under the conditions of shaking or accidental external force contact, resulting in an increase in the defective rate of the product. When the value of B is greater than 0.5 mm, the welding strength between the explosion-proof part 12 and the end cover main body 11 is too high, which easily leads to the explosion-proof part 12 still being unable to break and relieve pressure when the pressure value in the battery case reaches the explosion-proof pressure value, affecting safety. When the range of the value of B is 0.4 mm - 0.5 mm, the safety can be improved on the basis of ensuring the product qualification rate.
[0037] Please refer to Figure 1 and Figure 2 , in some embodiments, the explosion-proof part 12 and the explosion-proof port 113 have the same shape and are both waist-shaped structures, or can also be special-shaped structures of other shapes. The traditional circular structure is affected by the interference of the end cover pole, the liquid injection hole 115, and the welding part between the end cover and the bus bar or the case, resulting in a limited opening area of the circular explosion-proof port 113 and being unable to achieve rapid pressure relief, and there will still be potential safety hazards. Thus, by designing the explosion-proof part 12 as a waist-shaped structure to replace the traditional circular structure, it is convenient to expand the area of the explosion-proof port 113, so as to achieve rapid pressure relief and further improve safety.
[0038] In some embodiments, the number of the explosion-proof parts 12 and the explosion-proof ports 113 is the same, and each explosion-proof part 12 covers a corresponding explosion-proof port 113. The multiple explosion-proof ports 113 are arranged on the end cover main body 11 at intervals; thus, by designing the number of the explosion-proof ports 113 as multiple, it is convenient to increase the pressure relief area and thereby improve the pressure relief effect.
[0039] Please refer to Figure 1 and Figure 2 , in some embodiments, the end cover main body 11 includes an end cover substrate 111 and a sealing nail 112. The end cover substrate 111 is provided with a liquid injection hole 115, and the liquid injection hole 115 penetrates through the end cover substrate 111. The sealing nail 112 is inserted into the liquid injection hole 115 and is used to seal the liquid injection hole 115; thus, it is convenient to inject liquid into the battery case through the liquid injection hole 115 and seal the liquid injection hole 115 after injection through the sealing nail 112.
[0040] Please refer to Figure 1 and Figure 3, in some embodiments, a welding groove 114 is further disposed on one side of the end - cover substrate 111. The end - cover structure 10 further includes a bus bar 13. The bus bar 13 is disposed on the other side of the end - cover substrate 111 and is fixedly welded to the end - cover body 11 at the welding groove 114. During welding, by disposing the welding groove 114 on one side of the end - cover substrate 111, a configuration groove is first formed, so that the thickness at the welding position between the end - cover substrate 111 and the bus bar 13 is reduced, facilitating easier penetration of the end - cover substrate 111 and the bus bar 13 during welding. Moreover, the welding position between the bus bar 13 and the end - cover substrate 111 forms a current channel, thus meeting the over - current requirement of the end - cover structure 10. Also, since the welding position corresponding to the welding groove 114 on the end - cover substrate 111 is in contact with the bus bar 13, the gap between the bus bar 13 and the bottom cover is reduced, improving the internal usable space of the battery.
[0041] Please refer to Figure 1 , in some embodiments, the number of the welding grooves 114 is multiple. The multiple welding grooves 114 are circumferentially spaced with the center line of the end - cover substrate 111 as the axis; the shape of the welding groove 114 is an arc - shaped structure. Thus, by providing multiple welding grooves 114 and designing the welding grooves 114 as arc - shaped structures, it is convenient to increase the welding positions with a larger contact area between the end - cover substrate 111 and the bus bar 13, facilitating ensuring the over - current requirement of the end - cover structure 10. Moreover, the welding positions with a larger area are beneficial to improving the welding strength.
[0042] An embodiment of the present disclosure further provides a battery. The battery includes the above - mentioned end - cover structure 10, a housing, and an inner core. The inner core is received in the housing, and the end - cover structure 10 covers and seals the end of the housing.
[0043] As described above, the above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claimed rights.
Claims
1. An end cap structure, characterized in that, The end cover structure includes: An end cover body configured with an explosion-proof port that penetrates the end cover body, and the end cover body is used to be welded to an external battery case; An explosion-proof component that covers the explosion-proof port and is fixed to the end cover body by welding, and the welding strength between the explosion-proof component and the end cover body is less than the welding strength between the end cover body and the external battery case.
2. The end cover structure according to claim 1, wherein The explosion-proof component and the explosion-proof port have the same shape and are both in an oval structure.
3. The end cover structure according to claim 1, wherein The welding bead width between the explosion-proof component and the end cover body is 0.8 mm - 1.2 mm.
4. The end cover structure according to claim 3, wherein The welding penetration depth between the explosion-proof component and the end cover body is 0.4 mm - 0.5 mm.
5. The end cap structure according to claim 1, characterized in that, The number of the explosion-proof components and the explosion-proof ports is the same, each explosion-proof component covers a corresponding one of the explosion-proof ports, and a plurality of the explosion-proof ports are spacedly arranged on the end cover body.
6. The end cap structure according to claim 1, characterized in that, The end cover body includes: An end cover substrate configured with a liquid injection hole that penetrates the end cover substrate; A sealing nail that is inserted into the liquid injection hole and is used to seal the liquid injection hole.
7. The end cover structure according to claim 6, wherein A welding groove is further configured on one surface of the end cover substrate, and the end cover structure further includes a bus bar that is arranged on the other surface of the end cover substrate and is fixedly welded to the end cover body at the welding groove.
8. The end cover structure according to claim 7, wherein The number of the welding grooves is multiple, and the multiple welding grooves are circumferentially spaced with the center line of the end cover substrate as the axis.
9. The end cover structure according to claim 8, wherein The shape of the welding groove is an arc structure.
10. A battery, characterized in that, The battery includes the end cover structure according to any one of claims 1 - 9.