Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which comprises a shell, a battery cell, a battery top cover and an adapter piece, an opening is arranged on the shell, the battery cell is accommodated in the shell from the opening, and a tab of the battery cell is connected with the adapter piece; the battery top cover comprises a cover plate main body, an insulating part and a pole; the cover plate main body comprises a first surface opposite to a battery cell and a second surface facing the battery cell, the cover plate main body is provided with mounting holes respectively penetrating through the first surface and the second surface, the pole columns are arranged at the mounting holes and do not exceed the first surface, and the insulating parts surround the peripheries of the pole columns and insulate and separate the cover plate main body and the pole columns. An accommodating groove communicated with the mounting hole is formed in the second surface, and the switching piece is connected with the pole, is accommodated in the accommodating groove and does not exceed the second surface; according to the scheme, the technical problem that the energy density of a battery in the prior art is limited due to the fact that a top cover occupies too much height space is mainly solved.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and more particularly to a battery. Background Technology

[0002] Currently, the top cover of lithium-ion batteries typically includes inner and outer terminals, lower plastic, adapter plates, and welding thickness of the tabs. This results in a relatively thick top cover that occupies a significant portion of the battery's height, thus limiting the battery's energy density. Furthermore, the tabs of the battery cells are usually welded to the bottom of the top cover. After the tabs and top cover are welded together and the top cover seals the casing, the tabs are bent within the casing. A considerable amount of height space is reserved between the top cover and the battery cell to accommodate these bent tabs, leading to wasted internal space and further limiting the battery's energy density.

[0003] Therefore, improvements to existing technologies are necessary.

[0004] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0005] This utility model provides a battery that mainly solves the technical problem that the energy density of existing batteries is limited due to the excessive height space occupied by the top cover.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery includes a casing, a battery cell, a battery top cover, and an adapter plate. The casing has an opening, the battery cell is received inside the casing through the opening, and the tabs of the battery cell are connected to the adapter plate.

[0008] The battery top cover includes a cover plate body, insulating components, and terminal posts;

[0009] The cover plate body seals the opening. The cover plate body includes a first surface facing away from the battery cell and a second surface facing the battery cell. The cover plate body is provided with mounting holes that pass through the first surface and the second surface respectively. The electrode post is disposed at the mounting hole and does not extend beyond the first surface. The insulating member surrounds the outer periphery of the electrode post and insulatingly separates the cover plate body and the electrode post. The second surface is provided with a receiving groove communicating with the mounting hole. The adapter piece is connected to the electrode post and is received in the receiving groove and does not extend beyond the second surface.

[0010] In one of the technical solutions, the insulating component is a plastic component, which is injection molded in a mold and plastically bonded to the cover plate body and the pole as an integral structure.

[0011] In one of the technical solutions, the insulating component includes a first insulating portion and a second insulating portion that are connected and are both annular, and the outer dimensions of the first insulating portion are larger than the outer dimensions of the second insulating portion.

[0012] A groove is provided on the first surface, and the mounting hole is provided at the bottom of the groove. The first insulating part is embedded in the groove and does not extend beyond the first surface. The second insulating part is inserted into the mounting hole and abuts against the wall of the mounting hole.

[0013] In one of the technical solutions, the side of the adapter plate facing away from the battery cell is used for connecting the electrode tab, and a receiving space for receiving the electrode tab is provided between the adapter plate and the bottom of the receiving groove.

[0014] In one of the technical solutions, an insulating layer is provided on the second surface.

[0015] In one of the technical solutions, the thickness of the insulating layer is 0.001mm-0.5mm.

[0016] In one of the technical solutions, the surface of the insulating component facing away from the battery cell is flush with the first surface, and the surface of the electrode facing away from the battery cell is flush with the first surface.

[0017] In one of the technical solutions, the side of the adapter plate facing away from the battery cell has a boss at the position corresponding to the electrode post, and the boss is welded to the electrode post.

[0018] In one of the technical solutions, the adapter plate is provided with a through-hole, and the electrode of the battery cell passes through the through-hole and is connected to the side of the adapter plate facing away from the battery cell.

[0019] In one of the technical solutions, the surface of the adapter plate facing the battery cell is flush with the second surface.

[0020] Compared with the prior art, the battery provided by this utility model has at least the following beneficial effects:

[0021] This design eliminates the traditional external electrode protrusion and internal electrode. The electrode is designed to not extend beyond the first surface of the cover body. By incorporating the existing adapter piece into the cover body and designing the adapter piece to not extend beyond the second surface of the cover body, the thickness of the top cover can be reduced, thereby reducing the height space occupied by the top cover in the battery. In other words, with a fixed total battery height, more height space is freed up for the cell to utilize, which in turn helps to improve the volumetric energy density and gravimetric energy density of the battery under the same chemical system conditions. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is an exploded view of the structure of a battery provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 A cross-sectional view of a battery provided in an embodiment of this application;

[0026] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0027] Figure 5 This is a schematic diagram of the battery top cover provided in an embodiment of this application, viewed from below.

[0028] Figure 6 This is a schematic diagram of the structure of the insulating component provided in an embodiment of this application.

[0029] Figure label:

[0030] 1. Casing; 11. Opening; 2. Cell; 21. Tab; 3. Battery top cover; 31. Cover body; 311. First surface; 312. Second surface; 313. Mounting hole; 314. Receiving groove; 315. Groove; 316. Insulating layer; 32. Insulating component; 321. First insulating part; 322. Second insulating part; 33. Adapter piece; 331. Lead-out hole; 332. Boss; 34. Terminal post; 4. Receiving space. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] 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.

[0036] Please refer to the following: Figures 1 to 5 This utility model provides a battery, including a casing 1, a battery cell 2, a battery top cover 3, and an adapter plate 33. The casing 1 has an opening 11, through which the battery cell 2 is received into the casing 1. The battery top cover 3 seals the opening 11 to prevent electrolyte leakage from the casing 1 and to prevent external substances from entering the casing 1. Furthermore, the battery cell 2 has two tabs 21, one of which is a positive tab and the other a negative tab. At least one of the two tabs 21 is electrically connected to the battery top cover 3 via the adapter plate 33 to conduct the positive and / or negative polarity of the battery cell 2 to the battery top cover 3.

[0037] Please refer to the following: Figures 1 to 5The battery top cover 3 mainly includes a cover body 31, an insulating component 32, and a terminal post 34. The cover body 31 is used to seal the opening 11. The cover body 31 includes a first surface 311 facing away from the battery cell 2 and a second surface 312 facing the battery cell 2. The cover body 31 is provided with mounting holes 313 that pass through the first surface 311 and the second surface 312 respectively. The terminal post 34 is located at the mounting hole 313 and does not extend beyond the first surface 311. The adapter piece 33 connects to the battery cell 2. The tab 21 is connected, and the adapter 33 is also connected to the terminal 34 to lead the positive or negative polarity of the cell 2 to the terminal 34 through the adapter 33. The insulating member 32 surrounds the outer periphery of the terminal 34 and insulatingly separates the cover plate body 31 and the terminal 34 to prevent the cover plate body 31 from becoming charged and causing a short circuit in the battery. The second surface 312 is provided with a receiving groove 314 communicating with the mounting hole 313. The adapter 33 is received in the receiving groove 314 and does not extend beyond the second surface 312. Specifically, this solution eliminates the traditional external electrode protrusion and internal electrode. The electrode 34 is designed to not exceed the first surface 311 of the cover body 31. By incorporating the existing adapter piece 33 into the cover body 31 and designing the adapter piece 33 to not exceed the second surface 312 of the cover body 31, the thickness of the battery top cover 3 can be reduced, thereby reducing the height space occupied by the battery top cover 3. That is, with a fixed total battery height, more height space is freed up for the cell 2, which in turn helps to improve the volumetric energy density and gravimetric energy density of the battery under the same chemical system conditions.

[0038] Please see Figure 4 In this design, the insulating component 32 is preferably a plastic component. Furthermore, the insulating component 32 is injection molded in a mold and integrally bonded to the cover plate body 31 and the terminal post 34. In other words, during manufacturing, the cover plate body 31 and the terminal post 34 are pre-placed in the mold, and then the insulating component 32 is formed between the cover plate body 31 and the terminal post 34 through injection molding. This structure eliminates the need for a sealing ring that occupies considerable height between the terminal post 34 and the adapter piece 33, while still ensuring excellent sealing between the insulating component 32 and the cover plate body 31, and also ensuring excellent sealing between the insulating component 32 and the terminal post 34. Since there is no need for a sealing ring that occupies considerable height between the terminal post 34 and the adapter piece 33, it is beneficial to ensure that the adapter piece 33 does not extend beyond the second surface 312 of the cover plate body 31, and also to ensure that the terminal post 34 does not extend beyond the first surface 311 of the cover plate body 31. This allows the battery top cover 3 to have an extremely thin thickness, thereby improving the battery's energy density.

[0039] Please refer to the following: Figure 4 and Figure 6The insulating component 32 specifically includes an integrally connected first insulating part 321 and second insulating part 322. Both the first insulating part 321 and the second insulating part 322 are circular annular structures. The outer dimensions of the first insulating part 321 are larger than those of the second insulating part 322. Preferably, the outer diameter of the first insulating part 321 is 4-6 mm larger than the outer diameter of the second insulating part 322. A groove 315 is provided on the first surface 311. The bottom of the groove 315 is provided with the aforementioned mounting hole 313. The first insulating part 321 is embedded in the groove 315 and does not extend beyond the first surface 311. The second insulating part 322 is inserted into the mounting hole 313 and abuts against the wall of the mounting hole 313. This design improves the sealing performance between the insulating component 32 and the cover plate body 31. At the same time, due to the support of the groove 315, the risk of the insulating component 32 and the electrode post 34 falling towards the cell 2 is reduced, and the connection strength between the insulating component 32 and the cover plate body 31 is improved.

[0040] Please refer to it again. Figure 4 The side of the adapter piece 33 facing away from the battery cell 2 (which can be understood as the top surface of the adapter piece 33) is used to connect with the tab 21. Preferably, the adapter piece 33 is provided with a lead hole 331. The tab 21 passes through the lead hole 331, bends and is welded to the side of the adapter piece 33 facing away from the battery cell 2 (which can be understood as the top surface of the adapter piece 33). A receiving space 4 is provided between the adapter piece 33 and the bottom of the receiving groove 314. This receiving space 4 is used to receive the tab 21 welded on the adapter piece 33. With this design, when the cover plate body 31 seals the opening 11 of the housing 1, there is no need to reserve too much height space between the cover plate body 31 and the battery cell 2 to receive the bent tab 21. This allows the battery cell 2 to be closer to the cover plate body 31, which in turn helps to free up more height space for the battery cell 2 to use. Since the battery cell 2 can be closer to the cover plate body 31 using this solution, in order to prevent the battery cell 2 from contacting the second surface 312 of the cover plate body 31 and causing a short circuit, it is preferable to provide an insulating layer 316 on the second surface 312 of the cover plate body 31. The thickness of the insulating layer 316 is preferably thin, 0.001mm-0.5mm. The insulating layer 316 can be insulating varnish, insulating pad, or other insulating components.

[0041] Please see Figure 2On the side of the adapter piece 33 facing away from the cell 2 (which can be understood as the top surface of the adapter piece 33), a boss 332 is provided at the position corresponding to the terminal 34. This boss 332 is welded to the terminal 34. By providing this boss 332, the thickness of the area where the adapter piece 33 and the terminal 32 are welded can be appropriately increased, reducing the risk of the adapter piece 33 being welded through. Moreover, by providing this boss 332, it is also beneficial to form the aforementioned receiving space 4 between the adapter piece 33 and the cover plate body 31, so as to facilitate the welding of the tab 21 to the top surface of the adapter piece 33. In addition, the boss 332 can also be positioned and welded by interlocking with the terminal 34, which helps to improve the positional accuracy of the welding between the adapter piece 33 and the terminal 34.

[0042] Please refer to the following: Figure 4 and Figure 5 The surface of the insulating member 32 facing away from the cell 2 (which can be understood as the top surface of the insulating member 32) is preferably flush with the first surface 311 of the cover body 31. The surface of the terminal post 34 facing away from the cell 2 (which can be understood as the top surface of the terminal post 34) is also preferably flush with the first surface 311 of the cover body 31. The surface of the adapter piece 33 facing the cell 2 (which can be understood as the bottom surface of the adapter piece 33) is preferably flush with the second surface 312 of the cover body 31. With this design, the thickness of the cover body 31 is the same as the thickness of the battery top cover 3, thereby freeing up as much height space as possible for the cell 2 to use under a certain battery height, which is conducive to improving the energy density of the battery.

[0043] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A battery, characterized by, The battery includes a shell (1), an electric core (2), a battery top cover (3) and an adapter sheet (33), the shell (1) is provided with an opening (11), the electric core (2) is accommodated in the shell (1) from the opening (11), and the tab (21) of the electric core (2) is connected with the adapter sheet (33); The battery top cover (3) includes a cover plate body (31), an insulating piece (32) and a pole (34); The cover plate body (31) seals the opening (11), the cover plate body (31) includes a first surface (311) facing away from the electric core (2) and a second surface (312) facing the electric core (2), the cover plate body (31) is provided with a mounting hole (313) penetrating through the first surface (311) and the second surface (312) respectively, the pole (34) is arranged at the mounting hole (313) and does not exceed the first surface (311), the insulating piece (32) is arranged around the outer periphery of the pole (34) and insulates and separates the cover plate body (31) and the pole (34), the second surface (312) is provided with an accommodation groove (314) in communication with the mounting hole (313), the adapter sheet (33) is connected with the pole (34), and the adapter sheet (33) is accommodated in the accommodation groove (314) and does not exceed the second surface (312).

2. The battery of claim 1, wherein, The insulating piece (32) is a plastic piece, and the insulating piece (32) is injection molded in a mold and integrally connected with the cover plate body (31) and the pole (34).

3. The battery of claim 2, wherein the cathode is a lithium cobalt oxide cathode. The insulating piece (32) includes a first insulating part (321) and a second insulating part (322) connected and both being annular; The first surface (311) is provided with a groove (315), the groove bottom of the groove (315) is provided with the mounting hole (313), the first insulating part (321) is embedded into the groove (315) and does not exceed the first surface (311), and the second insulating part (322) is inserted into the mounting hole (313) and abuts against the hole wall of the mounting hole (313).

4. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The adapter sheet (33) is used for connecting the tab (21) on the side facing away from the electric core (2), and a storage space (4) for storing the tab (21) is arranged between the adapter sheet (33) and the groove bottom of the accommodation groove (314).

5. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The second surface (312) is provided with an insulating layer (316).

6. The battery of claim 5, wherein the cathode is a lithium cobalt oxide cathode. The thickness of the insulating layer (316) is 0.001mm-0.5mm.

7. The battery of any one of claims 1 to 6, wherein the cathode comprises a lithium metal oxide. The surface of the insulating piece (32) facing away from the electric core (2) is flush with the first surface (311); The surface of the pole (34) facing away from the electric core is flush with the first surface (311).

8. The battery of any one of claims 1 to 6, wherein the electrolyte comprises a lithium salt. The adapter sheet (33) is provided with a boss (332) at a position corresponding to the pole (34) on the side facing away from the electric core (2), and the boss (332) is welded with the pole (34).

9. The battery of any one of claims 1 to 6, wherein, The adapter piece (33) is provided with a through lead-out hole (331), and the tab (21) of the battery cell (2) passes through the lead-out hole (331) and is connected to the side of the adapter piece (33) away from the battery cell (2).

10. The battery of any one of claims 1 to 6, wherein, The surface of the adapter piece (33) facing the battery cell (2) is flush with the second surface (312).

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