Top cover of battery and battery
By using the adapter welded with the folding part in the battery cover, the problem of space occupied by the extreme ears is solved and the energy density of the battery is improved.
Patent Information
- Application Number
- CN202422241665.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-09-12
AI Technical Summary
During the assembly process of existing batteries, the bend of the pole ear takes up a lot of space, resulting in a lower energy density of the battery.
The flip part design of the adapter is adopted to penetrate upwards and connect it to the base, reducing the space occupied by the pole ears, and forming an pole column structure through welding the flip part to the base.
The space utilization rate of the battery at the same height is improved, the capacity of the battery cell is increased, and the energy density of the battery is increased.
Smart Images
Figure CN223260814U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery. Background Art
[0002] Existing batteries usually include a shell, a battery cell and a top cover, wherein the battery cell is accommodated in the shell, and the top cover is used to seal the opening on the shell. The top cover specifically includes a cover body and a pole connected to the cover body. The current battery assembly process mostly pre-welds an adapter to the pole ear of the battery cell, and then welds the adapter to the bottom of the pole to lead the electrical properties of the battery cell to the pole. With this structure, after the cover body seals the opening of the shell, more space needs to be reserved between the cover body and the top surface of the battery cell to accommodate the pole ear in a bent state, which makes the space utilization inside the shell low, and thus makes the battery energy density low.
[0003] Therefore, there is a need to improve the existing technology.
[0004] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content
[0005] The utility model provides a battery top cover and a battery, mainly solving the technical problem of how to improve the energy density of the battery.
[0006] To achieve the above objectives, the present invention provides the following technical solutions:
[0007] A top cover of a battery, comprising a cover body, a base and an adapter;
[0008] The cover body is provided with a through hole, the base is provided at the hole and connected to the cover body;
[0009] The adapter includes a connected main body and a folding portion, the folding portion can be bent relative to the main body, the surface of the main body or the surface of the folding portion is used to connect with the tab led out from the battery cell, the adapter is inserted into the hole from bottom to top, and the folding portion is configured to pass through to the top of the base, and the folding portion is used to connect with the base.
[0010] In one of the technical solutions, the adapter includes at least two folding parts connected to the main body, and multiple folding parts are arranged at the end of the main body and around the outer periphery of the main body. Multiple folding parts are configured to pass through the top of the base, and multiple folding parts are used to connect to the base.
[0011] In one of the technical solutions, the adapter includes two folding parts that are arranged opposite to each other. When the two folding parts are connected to the base, the two folding parts that are arranged opposite to each other and the main body together form a T-shaped structure.
[0012] In one of the technical solutions, the base is an annular structure with a through hole in the middle, the top surface of the base is used for connecting multiple folding parts, and the through hole is connected to the hole position.
[0013] In one of the technical solutions, the outer side wall of the main body is used for connection of the tab.
[0014] In one of the technical solutions, a through hole is provided on the cover body, the base is provided in the hole, and the top surface of the base is lower than the top surface of the cover body, so that a receiving space is left above the base, and the receiving space is used to receive at least part of the folding portion.
[0015] In one of the technical solutions, the folded portion is entirely accommodated in the accommodation space, so that the adapter does not exceed the top surface of the cover body.
[0016] In one of the technical solutions, the cover plate body is a non-conductive plastic part.
[0017] In one of the technical solutions, a plurality of holes are provided on the base, and the cover body includes plastic filled in the plurality of holes.
[0018] The present application also provides a battery, comprising a shell, a battery cell and a top cover as described in any of the above technical solutions, wherein the shell is provided with an opening, the battery cell is accommodated in the shell through the opening, the cover body seals the opening, and a tab is led out from the battery cell, and the tab is connected to the adapter.
[0019] Compared with the prior art, the battery top cover provided by the present invention has at least the following beneficial effects:
[0020] Before assembly, the base can be fixed to the cover body in advance, and the tabs led out from the battery cell can be welded to the adapter in advance; during assembly, the folding part can first be folded relative to the main body to reduce the width of the adapter, so that the adapter can be inserted into the hole of the cover body from bottom to top. When the folding part on the adapter passes upward, the folding part is bent so that the folding part is located directly above the base. Then the folding part and the base are connected to fix the adapter on the base. At this time, the adapter is fixed to the base, and the folding part on the adapter is equivalent to the pole on the traditional top cover.
[0021] As can be seen from the above paragraph, this solution adopts a structural design in which the adapter needs to be passed upward and located on the top of the base, so that there is no need to reserve too much space between the cover body and the top surface of the battery cell to accommodate the bent pole ear, which is conducive to shortening the distance between the cover body and the top surface of the battery cell, so that the battery has more space for battery cells to use at a certain height, which is conducive to improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 A schematic structural diagram of a battery provided in an embodiment of the present application;
[0024] Figure 2 A top view of the top cover provided in an embodiment of the present application;
[0025] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;
[0026] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;
[0027] Figure 5 for Figure 3 A partial enlarged view of point C in the middle;
[0028] Figure 6 A schematic diagram of the structure of the adapter provided in an embodiment of the present application when the folding portion is folded upward;
[0029] Figure 7 A schematic diagram of the structure of the adapter provided in an embodiment of the present application after the folding portion is folded downward;
[0030] Figure 8 A schematic diagram of the structure of the adapter with the connected tab provided in an embodiment of the present application when it is inserted into the hole of the top cover.
[0031] Reference numerals:
[0032] 1. Shell; 11. Opening; 2. Battery cell; 21. Tab; 3. Top cover; 31. Cover body; 311. Hole position; 312. Liquid injection hole; 32. Base; 321. Through hole; 322. Connection hole; 33. Adapter; 331. Main body; 332. Folding part; 333. Fold line; 34. Accommodation space; 35. Explosion-proof valve. DETAILED DESCRIPTION
[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0034] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0035] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
[0038] See also Figure 1 The present invention provides a battery comprising a housing 1, a battery cell 2, and a top cover 3. The housing 1 has an opening 11, through which the battery cell 2 is loaded. The top cover 3 seals the opening 11 to prevent foreign matter from entering the housing 1 and to prevent the electrolyte within the housing 1 from leaking out. The battery cell 2 has a tab 21 extending therefrom, which is typically connected to the top cover 3.
[0039] Please also refer to Figures 1 to 8The top cover 3 specifically includes a cover body 31, a base 32 and an adapter 33, wherein the cover body 31 is used to seal the above-mentioned opening 11, and the cover body 31 is provided with at least one through hole 311 and an injection hole 312, and the electrolyte can be injected into the battery from the injection hole 312. The base 32 is set at the hole 311 and fixedly connected to the cover body 31, and the adapter 33 is used to be welded to the tab 21, and the adapter 33 is also used to be welded to the base 32. The folding portion 332 is configured to bend along the fold line 333 relative to the main body 331 , so that the surface of the main body 331 or the surface of the folding portion 332 can be used for welding with the tab 21 led out from the battery cell 2 . The adapter 33 is inserted into the hole 311 of the cover body 31 from bottom to top, and the folding portion 332 is configured to be inserted above the base 32 . The folding portion 332 is used to connect with the base 32 . The folding portion 332 is preferably welded to the top surface of the base 32 , and the weld between the two is preferably a circumferential circle to seal the hole 311 to prevent the electrolyte inside the shell 1 from leaking out from the hole 311 , and also to prevent foreign matter from entering the shell 1 from the hole 311 . In addition, the way the folding portion 332 and the base 32 are welded to each other can increase the conductive area of the battery, so that the battery can adapt to a use environment with a larger current. In other embodiments, the folded portion 332 may be fixedly connected to the base 32 by means of fasteners, and the purpose of sealing the hole 311 may be achieved by filling a sealant in a gap between the folded portion 332 and the base 32 .
[0040] Specifically, before assembly, the base 32 can be fixed on the cover body 31 in advance, and the tabs 21 led out of the battery cell 2 can be welded to the adapter 33 in advance; during assembly, the folded portion 332 can be Figure 6 As shown in FIG, the adapter 33 is first folded relative to the main body 331 to reduce the width of the adapter 33, and then the adapter 33 is Figure 8 As shown, the adapter 33 is inserted into the hole 311 of the cover body 31 from bottom to top. When the folded portion 332 on the adapter 33 is inserted upward, the folded portion 332 is inserted as shown. Figure 7 Bend downward as shown, so that the folded portion 332 is as shown Figure 4 As shown, it is located directly above the base 32 , and then the folded portion 332 and the top surface of the base 32 are welded together so that the adapter 33 is fixed on the base 32 . At this time, the folded portion 332 on the adapter 33 is equivalent to the pole on the traditional top cover 3 .
[0041] As can be seen from the above paragraph, this solution adopts a structural design in which the adapter 33 needs to be passed upward and located on the top of the base 32, so that there is no need to reserve too much space between the cover body 31 and the top surface of the battery cell 2 to accommodate the bent tab 21, which is beneficial to shorten the distance between the cover body 31 and the top surface of the battery cell 2, so that the battery has more space for the battery cell 2 to use at a certain height, which is beneficial to improve the energy density of the battery.
[0042] Please also refer to Figure 4 and Figures 6 to 8 , the adapter 33 includes at least two folding parts 332, both of which are arranged at the upper end position of the main body 331 and are arranged around the outer periphery of the main body 331. Multiple folding parts 332 are set to need to pass through the top of the base 32, and multiple folding parts 332 need to be welded to the top surface of the base 32. Through such a design, the contact area between the adapter 33 and the base 32 can be increased, so that the battery can adapt to the use requirements of a larger current to meet the battery's ability to achieve fast charging. Preferably, the adapter 33 of this embodiment includes two relatively arranged folding parts 332. When the two folding parts 332 are welded to the base 32, the two relatively arranged folding parts 332 and the main body 331 will be as follows Figure 4 As shown, they together form a T-shaped structure. Further preferably, the base 32 is an annular structure with a through hole 321 extending through the middle. The top surface of the base 32 is used for welding a plurality of folded portions 332 . The through hole 321 and the aforementioned hole position 311 are interconnected, so that the tab 21 and the main body 331 of the adapter 33 are actually simultaneously provided in the hole position 311 and the through hole 321 , thereby allowing the folded portions 332 to pass through to the top of the base 32 and be welded to the top surface of the base 32 .
[0043] Please also refer to Figure 4 、 Figure 6 or Figure 7 The tab 21 is preferably welded only to the outer wall of the main body 331. This design ensures sufficient conductive area between the tab 21 and the adapter 33, ensuring that the battery can be used under high-current conditions. In addition, the tab 21 will not break when the folded portion 332 is bent relative to the main body 331, thereby improving the battery's quality rate. In other embodiments, if the battery does not need to be used under high-current conditions, the tab 21 can be welded directly to the bottom surface of the main body 331.
[0044] Please refer again Figure 4The base 32 is preferably received in the hole 311, and the top surface of the base 32 is lower than the top surface of the cover body 31, so that a receiving space 34 is left above the base 32. At least a portion of the folded portion 332 of the adapter 33 is received in this receiving space 34, thereby reducing the distance between the top surface of the adapter 33 and the top surface of the cover body 31, so that the battery has more height space for the battery cell 2 to utilize at a certain height, thereby facilitating further improvement of the battery's energy density. Preferably, the folded portion 332 is entirely received in the receiving space 34, so that the adapter 33 does not extend beyond the top surface of the cover body 31. Further preferably, the top surface of the folded portion 332 can be flush with the top surface of the cover body 31, thereby further freeing up more height space for the battery cell 2 to utilize, thereby facilitating further improvement of the battery's energy density.
[0045] In this embodiment, the cover body 31 is preferably a plastic part that is injection molded in a mold. Since plastic parts are not conductive, the use of a plastic cover body 31 can eliminate the traditional insulating plate located below the cover body 31. Alternatively, if a plastic cover body 31 is used, there is no need to apply an insulating layer below the cover body 31, so that even if the distance between the cover body 31 and the top surface of the battery cell 2 is too small or even directly contacts the top surface of the battery cell 2, the battery cell 2 will not short-circuit. This allows the battery to have more height space for the battery cell 2 at a certain height, which is conducive to further improving the energy density of the battery. At the same time, since the plastic cover body 31 is lighter than the metal cover body 31, the energy density of the battery can be further improved. More specifically, during production, the base 32 can be placed into the mold first, and then plastic can be poured into the mold to form the cover body 31 on the base 32. This production method can ensure better sealing between the base 32 and the cover body 31. There is no need to fill the gap between the base 32 and the cover body 31 with sealant, thereby simplifying the production process and helping to improve the production efficiency of the battery. In addition, a plurality of connection holes 322 are provided on the base 32, and the cover body 31 includes plastic filled in the plurality of connection holes 322. With such a design, the cover body 31 can be engaged with the base 32 in the plurality of connection holes 322 to improve the connection strength between the cover body 31 and the base 32, reduce the risk of the base 32 detaching from the cover body 31, and improve the reliability of the battery structure. Among them, the depth direction of the connection hole 322 can be as follows: Figure 4 The direction shown is horizontal, and the depth direction of the connection hole 322 can also be set along the vertical direction. Different depth directions of the connection hole 322 correspond to different injection molding methods of the cover body 31. In addition, please refer to Figure 1An explosion-proof valve 35 can also be provided on the cover body 31, so that the battery can release pressure outward in time when thermal runaway occurs, so as to reduce the risk of battery explosion. During the manufacturing process of the top cover 3, the base 32 and the explosion-proof valve 35 can be placed in the mold together, and then the cover body 31 connected to the base 32 and the explosion-proof valve 35 is formed by mold injection.
[0046] Please also refer to Figures 3 to 5 The cover body 31 is preferably provided with two through holes 311, each of which is connected to a base 32, and each base 32 is connected to an adapter 33, one of which is connected to the positive electrode ear on the battery cell 2 to serve as a positive electrode column, and the other adapter 33 is connected to the negative electrode ear on the battery cell 2 to serve as a negative electrode column.
[0047] In summary, after the battery of this embodiment adopts the above-mentioned top cover 3, there is more height space for the battery cell 2 to utilize under a certain total height, so that the battery of this solution has the advantage of high energy density; in addition, since the cover body 31 of this solution is a lightweight plastic part, the energy density of the battery can be further improved.
[0048] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.
Claims
1. A battery top cover, characterized in that: It includes a cover plate body (31), a base (32) and an adapter (33); A through hole (311) is provided on the cover plate body (31), and the base (32) is provided at the hole (311) and connected to the cover plate body (31); The adapter (33) includes a main body (331) and a folding portion (332) connected to each other. The folding portion (332) is bendable relative to the main body (331). The main body (331) is used to connect with the tab led out from the battery core. The adapter (33) is inserted into the hole (311) from bottom to top, and the folding portion (332) is configured to be inserted above the base (32). The folding portion (332) is used to connect with the base (32).
2. The top cover of the battery according to claim 1, wherein: The adapter (33) includes at least two folding portions (332) connected to the main body (331), and the plurality of folding portions (332) are all arranged at the end of the main body (331) and are collectively arranged around the outer periphery of the main body (331). The plurality of folding portions (332) are all arranged to pass through to the top of the base (32), and the plurality of folding portions (332) are all used to connect to the base (32).
3. The top cover of the battery according to claim 2, wherein: The adapter (33) comprises two oppositely arranged folding portions (332). When the two folding portions (332) are connected to the base (32), the two oppositely arranged folding portions (332) and the main body (331) together form a T-shaped structure.
4. The top cover of the battery according to claim 2, wherein: The base (32) is an annular structure with a through hole (321) extending through the middle thereof. The top surface of the base (32) is used for connecting a plurality of the folding portions (332), and the through hole (321) is in communication with the hole position (311).
5. The top cover of the battery according to claim 1, wherein: The outer side wall of the main body (331) is used for connection of the tab.
6. The top cover of the battery according to claim 1, wherein: The base (32) is received in the hole (311), and the top surface of the base (32) is lower than the top surface of the cover body (31), so that a receiving space (34) is left above the base (32), and the receiving space (34) is used to receive at least a portion of the folding portion (332).
7. The top cover of the battery according to claim 6, wherein: The folding portion (332) is entirely accommodated in the accommodation space (34), so that the adapter (33) does not extend beyond the top surface of the cover plate body (31).
8. The top cover of the battery according to claim 1, wherein: The cover plate body (31) is a plastic part; a plurality of connection holes (322) are provided on the base (32); and the cover plate body (31) includes plastic filled in the plurality of connection holes (322).
9. The top cover of the battery according to claim 1, wherein: The cover plate body (31) is provided with two through-holes (311), each of the two holes (311) is connected to a base (32), and each base (32) is connected to an adapter (33), wherein one of the adapters (33) is used to connect to the positive electrode ear on the battery cell, and the other adapter (33) is used to connect to the negative electrode ear on the battery cell.
10. A battery, characterized in that: The invention comprises a shell (1), a battery cell (2) and a top cover (3) according to any one of claims 1 to 9, wherein the shell (1) is provided with an opening (11), the battery cell (2) is received in the shell (1) through the opening (11), the cover body (31) seals the opening (11), and a tab (21) is extended from the battery cell (2), and the tab (21) is connected to the adapter (33).