Top cover of battery and battery
By incorporating a sealing ring within the top cover of the lithium-ion battery and optimizing the design of the terminals and insulation components, the space occupation problem caused by exposed terminals was solved, achieving efficient utilization of the battery's internal space and improving energy and mass density.
Patent Information
- Application Number
- CN202422975195.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-03
AI Technical Summary
The exposed electrode thickness of the aluminum casing top cover of existing lithium-ion batteries is relatively large, which occupies a significant portion of the top cover's height space. This limits the usable space of the battery cells inside, affecting energy density and mass density.
A sealing ring is fitted inside the electrode post, and the insulation component and electrode post are positioned to abut against the sealing ring along the direction of the battery cell. The electrode post and insulation component together compress the sealing ring to achieve a reliable seal. At the same time, the design of the electrode post and adapter plate is optimized to reduce the space occupied.
By reducing the outward protrusion of the terminals, more internal space is freed up for the battery cells, thus improving the energy density and mass density of the battery.
Smart Images
Figure CN223743767U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of battery, especially a battery's top cover and battery. BACKGROUND
[0002] At present, the top cover of lithium ion battery aluminum shell mostly includes cover plate main body, pole, lower plastic, adapter sheet etc., wherein the thickness of the exposed pole is larger, and it occupies more height space of the top cover, in the case that the height space of the battery is certain, the space used by the battery inside for the battery cell is limited, thereby the energy density and mass density of the battery are lower. Therefore, the prior art needs to be improved. SUMMARY
[0003] The utility model provides a kind of battery's top cover and battery, mainly solve how to improve the technical problems of the space utilization of battery inside battery cell.
[0004] To achieve the above object, the utility model provides the following technical scheme:
[0005] A kind of top cover of battery, including cover plate main body, insulating piece, pole and sealing ring;
[0006] The cover plate main body is provided with the mounting hole of penetration, the mounting hole is provided with the pole, the insulating piece is annular and is located at the outer periphery of the pole to insulate and separate the cover plate main body and the pole, the sealing ring is sleeved on the pole and is located between the pole and the battery cell, and the insulating piece and the pole are set as being needed to be along the direction of the battery cell and the sealing ring is abutted.
[0007] In one of the technical solutions, the top cover further includes an adapter sheet, the adapter sheet is used to connect the pole and the battery cell, the sealing ring is arranged between the adapter sheet and the insulating piece, and the pole and the insulating piece are respectively used to compress the sealing ring together with the adapter sheet.
[0008] In one of the technical solutions, the pole includes a pole main body and a pole connecting sheet connected with each other, the pole main body is used to be connected with the adapter sheet and exposed outwardly, the pole connecting sheet is annular and has an outer shape larger than that of the pole main body, the sealing ring is sleeved on the pole main body, and the pole connecting sheet and the insulating piece are respectively used to compress the sealing ring together with the adapter sheet.
[0009] In one of the technical solutions, the size of the inner ring of the sealing ring is smaller than the outer shape size of the pole main body.
[0010] In one of the technical solutions, one side of the cover plate main body facing the battery cell is provided with a receiving groove, and the sealing ring is received in the receiving groove.
[0011] In one of the technical solutions, at least a portion of the adapter piece is also housed within the receiving slot.
[0012] In one of the technical solutions, there is a receiving space between the adapter piece and the bottom of the receiving groove, which is arranged adjacent to the sealing ring. The receiving space is used to receive the electrode tabs led out from the battery cell, and the side of the adapter piece facing away from the battery cell is used to connect with the electrode tabs.
[0013] In one of the technical solutions, the end of the electrode facing away from the battery cell does not extend beyond the side of the cover plate body facing away from the battery cell.
[0014] In one of the technical solutions, the side of the insulating member facing away from the battery cell does not extend beyond the side of the cover plate body facing away from the battery cell.
[0015] In one of the technical solutions, an insulating layer is provided on the side of the cover plate body facing the battery cell.
[0016] This application also provides a battery, including a housing, a battery cell, and the aforementioned top cover, wherein the housing has an opening, the battery cell is received inside the housing through the opening, and the top cover seals the opening.
[0017] Compared with the prior art, the top cover of the battery provided by this utility model has at least the following beneficial effects:
[0018] This design incorporates a sealing ring inside the terminal post and ensures that both the insulating component and the terminal post abut against the sealing ring in the direction pointing towards the battery cell. This allows the terminal post to achieve a reliable seal between the terminal post and the insulating component without protruding too much outward relative to the cover plate body, and it can even be flush with the top surface of the cover plate body. Because the terminal post occupies less height space, it frees up more height space inside the battery for the battery cell, thereby improving the battery's energy density and mass density. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;
[0021] Figure 2 for Figure 1 The diagram shown is an exploded view of the battery structure.
[0022] Figure 3 is a sectional view of the battery shown in FIG. 1; Figure 1
[0023] Figure 4 is a partial enlarged view of A in FIG. 1; Figure 3
[0024] Figure 5 is a bottom view of a top cover of the battery provided by the embodiment of the present application;
[0025] Figure 6 is a structural exploded view of the top cover shown in FIG. 3. Figure 5
[0026] Reference signs:
[0027] 1, housing; 11, opening; 2, battery cell; 21, tab; 3, top cover; 31, cover body; 311, mounting hole; 312, accommodating groove; 32, insulating member; 33, pole post; 331, pole post body; 332, pole post connecting piece; 34, sealing ring; 35, adapter piece; 36, accommodating space; 37, insulating layer. DETAILED DESCRIPTION
[0028] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.
[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can 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 can be directly connected to the other element or indirectly connected to the other element.
[0030] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0031] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0033] Please refer to the following: Figures 1 to 6 This utility model provides a battery, which mainly includes a casing 1, a battery cell 2, and a top cover 3. The casing 1 has an opening 11, through which the battery cell 2 is inserted into the casing 1. The top cover 3 is used to seal the opening 11 to prevent internal battery fluid from leaking out and to prevent external substances from entering the casing 1. Two tabs 21 are led out from the battery cell 2, one of which has a positive electrode and the other has a negative electrode. The top cover 3 is also used to connect with the tabs 21 on the battery cell 2 to lead out the positive and negative electrodes of the battery cell.
[0034] The top cover 3 includes a cover body 31, an insulating component 32, a terminal post 33, and a sealing ring 34. The cover body 31 is used to seal the opening 11. The thickness of the cover body 31 is preferably 1.5-3mm. The cover body 31 has a through mounting hole 311. The terminal post 33 is disposed in the mounting hole 311. The terminal post 33 is directly or indirectly connected to the tab 21. The insulating component 32 is arranged in a ring around the outer periphery of the terminal post 33, thereby insulatingly separating the cover body 31 and the terminal post 33, preventing the electrical current of the terminal post 33 from being conducted to the cover body 31, and preventing the battery from short-circuiting. The sealing ring 34 is fitted on the inner side of the electrode post 33 facing the cell 2, and the insulating member 32 and the electrode post 33 are both designed to abut against the sealing ring 34 in the direction pointing towards the cell 2 (which can be understood as downward). In fact, the outer diameter of the outer ring of the sealing ring 34 is larger than the outer diameter of the electrode post 33, so that when the insulating member 32 and the electrode post 33 abut against the sealing ring 34 respectively, the sealing ring 34 can seal the gap between the insulating member 32 and the electrode post 33, preventing the internal electrolyte from leaking out from the gap between the insulating member 32 and the electrode post 33, and also preventing external substances from entering the interior of the housing 1 from between the insulating member 32 and the electrode post 33.
[0035] Specifically, this solution includes a sealing ring 34 fitted inside the terminal post 33, and the insulating component 32 and the terminal post 33 are designed to abut against the sealing ring 34. This allows the terminal post 33 to achieve a reliable seal between the terminal post 33 and the insulating component 32 without protruding too much outward relative to the cover plate body 31, or even to be flush with the top surface of the cover plate body 31. Since the terminal post 33 occupies less height space, it is beneficial to free up more height space inside the battery for the cell to use, thereby improving the energy density and mass density of the battery.
[0036] In the embodiment, the top cover 3 further comprises a transition piece 35, the tab 21 on the battery cell 2 is first connected to the transition piece 35, and then the transition piece 35 is connected to the pole 33, so as to realize the electrical connection of the battery cell 2 through the transition of the transition piece 35 to the pole 33. In fact, when the battery is assembled, the pole 33 and the insulating piece 32 are compressed together with the transition piece 35 to seal the gap between the insulating piece 32 and the pole 33.
[0037] In the embodiment, the top cover 3 comprises two poles 33, one of which and the corresponding transition piece 35 are made of aluminum, and the other of which and the corresponding transition piece 35 are made of copper.
[0038] In the embodiment, preferably, the pole 33 specifically comprises a pole main body 331 and a pole connecting piece 332 connected together, the pole main body 331 is used for connecting with the transition piece 35 and exposing outward, and the pole connecting piece 332 is annular and has an outer shape larger than that of the pole main body 331. When the battery is assembled, the pole connecting piece 332 and the insulating piece 32 are compressed together with the transition piece 35 to seal the gap between the insulating piece 32 and the pole 33 in the direction pointing to the battery cell 2 (which can be understood as downward). The assembly can be performed in the following order: the insulating piece 32 is fixed in the mounting hole 311 of the cover main body 31 in advance, and the pole connecting piece 332 is placed on the insulating piece 32 in advance, then the tab 21 on the battery cell 2 is welded on the transition piece 35, then the pole main body 331 is welded on the transition piece 35, then the sealing ring 34 is sleeved on the pole main body 331, then the pole main body 331 is outwardly penetrated from the inner hole of the pole connecting piece 332, the pole connecting piece 332 and the insulating piece 32 are kept in the state of being compressed together with the transition piece 35 to seal the gap between the insulating piece 32 and the pole 33, and finally the pole main body 331 and the pole connecting piece 332 are welded together.
[0039] In the embodiment, the inner diameter of the sealing ring 34 is smaller than the outer diameter of the pole post body 331, preferably, the pole post body 331 is cylindrical, and the sealing ring 34 is annular, i.e., the inner diameter of the sealing ring 34 is smaller than the outer diameter of the pole post body 331, so that when the sealing ring 34 is sleeved on the pole post body 331, the sealing ring 34 will clamp the outer wall of the pole post body 331, and when the pole post connecting piece 332 abuts against the end surface of the sealing ring 34 after assembly, the sealing ring 34 can realize the function of secondary sealing of the gap between the pole post body 331 and the pole post connecting piece 332, further reducing the risk of leakage of electrolyte from the gap between the pole post body 331 and the pole post connecting piece 332 to the outside, and also reducing the risk of external substances entering the inside of the shell 1 from the gap between the pole post body 331 and the pole post connecting piece 332. In other embodiments, the shape of the sealing ring 34 can be non-cylindrical, such as square or polygonal, and the outer shape of the corresponding pole post body 331 can also be square or other polygonal.
[0040] In the embodiment, preferably, the side of the cover plate body 31 facing the battery cell 2 (which can also be understood as the bottom surface of the cover plate body 31) is provided with a receiving groove 312, and the sealing ring 34 is received in the receiving groove 312, so that the sealing ring 34 does not occupy the space inside the shell 1, thereby facilitating further freeing up more height space for the battery cell 2, and further facilitating further improving the energy density and mass density of the battery. Further preferably, the above-mentioned adapter piece 35 is also received in the receiving groove 312, so that the adapter piece 35 also does not occupy the space inside the shell 1, thereby facilitating further freeing up more height space for the battery cell 2, and further facilitating further improving the energy density and mass density of the battery.
[0041] In the embodiment, the accommodating space 36 is arranged between the adapter piece 35 and the bottom of the accommodating groove 312, and the tab 21 on the battery cell 2 is welded to the side of the adapter piece 35 away from the battery cell 2 (which can be understood as the top side of the adapter piece 35) at the accommodating space 36, so that the tab 21 on the battery cell 2 is accommodated in the accommodating space 36. With this design, the lower side of the adapter piece 35 does not need to reserve too much space for the bent tab 21, that is, the top side of the battery cell 2 can be closer to the bottom side of the cover plate body 31, thereby further facilitating the release of more height space for the battery cell 2, and further facilitating the improvement of the energy density and mass density of the battery. Preferably, the side of the cover plate body 31 facing the battery cell 2 is provided with an insulating layer 37, so that the cover plate body 31 does not cause short circuit of the battery due to contact with the battery cell 2, and the top side of the battery cell 2 can be closer to the bottom side of the cover plate body 31 or even directly abut against the bottom side of the cover plate body 31, thereby facilitating the improvement of the energy density and mass density of the battery. The thickness of the insulating layer 37 is preferably 0.001-0.5 mm.
[0042] In the embodiment, the end of the pole 33 away from the battery cell 2 does not exceed the side of the cover plate body 31 away from the battery cell 2 (which can be understood as the top side of the cover plate body 31), and the side of the insulating piece 32 away from the battery cell 2 does not exceed the side of the cover plate body 31 away from the battery cell 2 (which can be understood as the top side of the cover plate body 31), so that the inside of the shell 1 has more space for the battery cell 2 under the condition of a certain height, thereby facilitating the improvement of the energy density and mass density of the battery. Preferably, the end of the pole 33 away from the battery cell 2 is flush with the top side of the cover plate body 31, and the side of the insulating piece 32 away from the battery cell 2 is also flush with the top side of the cover plate body 31.
[0043] The above is only a preferred embodiment of the present application, and only the technical principle of the present application is specifically described, and these descriptions are only for explaining the principle of the present application, and cannot be explained as a limitation on the protection scope of the present application in any way. Based on the explanation herein, any modification, equivalent replacement and improvement within the spirit and principle of the present application, and other specific embodiments of the present application that can be conceived by those skilled in the art without creative labor, should be included in the protection scope of the present application.
Claims
1. A top cover of a battery, characterized by, The cover plate body (31) is provided with a through mounting hole (311), the mounting hole (311) is provided with the pole (33), the insulating part (32) is annularly arranged on the outer periphery of the pole (33) to insulate and separate the cover plate body (31) and the pole (33), and the sealing ring (34) is sleeved on the pole (33) and located between the pole (33) and the battery cell, and the insulating part (32) and the pole (33) are arranged to be in contact with the sealing ring (34) in the direction of the battery cell. The top cover further comprises a connecting piece (35) connected to the pole (33) and the battery cell, and the sealing ring (34) is arranged between the connecting piece (35) and the insulating part (32), and the pole (33) and the insulating part (32) jointly compress the sealing ring (34) together with the connecting piece (35).
2. The top cover of the battery according to claim 1, wherein The pole (33) comprises a pole body (331) and a pole connecting piece (332) connected to each other, the pole body (331) and the connecting piece (35) are connected and exposed outwardly, the pole connecting piece (332) is annular and has an outer shape larger than that of the pole body (331), the sealing ring (34) is sleeved on the pole body (331), and the pole connecting piece (332) and the insulating part (32) are respectively arranged on the side of the sealing ring (34) away from the battery cell and jointly compress the sealing ring (34) together with the connecting piece (35).
3. The battery top cover of claim 2, wherein, The inner ring of the sealing ring (34) has a size smaller than the outer shape size of the pole body (331).
4. The battery top cover of claim 3, wherein, The cover plate body (31) is provided with a receiving groove (312) on the side facing the battery cell, and the sealing ring (34) is received in the receiving groove (312).
5. The battery top cover of claim 2, wherein, At least part of the connecting piece (35) is also received in the receiving groove (312).
6. The battery top cover of claim 5, wherein, The connecting piece (35) and the groove bottom of the receiving groove (312) have a containing space (36) adjacent to the sealing ring (34), and the containing space (36) is used for receiving the tab led out on the battery cell.
7. The battery top cover of claim 5, wherein, The end of the pole (33) away from the battery cell does not exceed the side of the cover plate body (31) away from the battery cell, and the side of the insulating part (32) away from the battery cell does not exceed the side of the cover plate body (31) away from the battery cell.
8. The battery top cover according to any one of claims 1 to 6, wherein The cover plate body (31) is provided with an insulating layer (37) on the side facing the battery cell.
9. The battery top cover according to any one of claims 1 to 6, wherein The battery cell (2) is received in the shell (1), and the cover plate body (31) of the top cover (3) seals the shell (1).
10. A battery, characterized by