Top cover of battery and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover of a battery and the battery, and the top cover comprises a cover plate main body, an insulating part and a pole assembly, a through hole is formed in the cover plate main body, the pole assembly is arranged at the hole, the insulating part is of an annular structure with a middle hole in the middle, and the insulating part surrounds the periphery of the pole assembly and is connected with the hole wall of the hole so as to insulate and separate the pole assembly from the cover plate main body; the pole assembly comprises an adapter piece and a pole cover plate, the adapter piece is provided with a through lead-out hole, the lead-out hole is used for enabling a tab led out of a cell to penetrate upwards, the adapter piece is used for being connected with the tab, and the pole cover plate is connected to the top of the adapter piece and used for covering the tab; at least part of the adapter sheet and at least part of the pole cover plate are accommodated in the middle hole; the technical problem of how to improve the energy density of the battery is mainly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover of a battery and a battery. Background Art

[0002] Existing batteries generally include a housing, an electric core, and a top cover. Among them, the electric core is housed in the housing, and the top cover is used to seal the opening on the housing. Specifically, the top cover includes a cover body and a pole column connected to the cover body. In the assembly process of current batteries, the tab of the electric core is usually pre-welded to a transfer piece, and then the transfer piece is welded to the bottom of the pole column to lead out the electricity of the electric core to the pole column. With this structure, after the cover body seals the opening of the housing, a relatively large space needs to be reserved between the cover body and the top surface of the electric core to house the tab in a bent state, resulting in low space utilization rate inside the housing and thus low energy density of the battery.

[0003] In order to improve the energy density of the battery, the prior art integrates the original transfer piece on the top cover and adopts a design in which the tab passes through the transfer piece upward and is welded to the top surface of the transfer piece, so that a relatively large space does not need to be reserved between the top cover and the top surface of the electric core to house the tab, and more height space inside the housing is vacated for the electric core to use, thereby improving the energy density of the battery. This structure requires a pole column cover plate to be provided on the top of the transfer piece to cover the tab that passes outwards and play a role in protecting the tab. Based on the existing battery structure, how to further improve the energy density of the battery is a technical problem that needs to be solved in this field.

[0004] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or admit whether any of the above content can be used as prior art relative to the present disclosure. Summary of the Utility Model

[0005] The utility model provides a top cover of a battery and a battery, mainly solving the technical problem of how to improve the energy density of the battery.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A top cover of a battery, comprising a cover body, an insulating member, and at least one pole column assembly;

[0008] A through hole is provided on the cover body, the pole column assembly is arranged at the through hole, the insulating member is a ring-shaped structure with a middle hole in the middle, and the insulating member surrounds the outer periphery of the pole column assembly and is connected to the hole wall of the through hole to insulate and separate the pole column assembly and the cover body;

[0009] The pole column assembly includes a transfer piece and a pole column cover plate. A through lead-out hole is provided on the transfer piece. The lead-out hole is used for the pole ear led out from the battery core to pass upward. The transfer piece is used to connect with the pole ear, and the pole column cover plate is connected to the top of the transfer piece and used to cover the pole ear. At least part of the transfer piece and at least part of the pole column cover plate are received in the middle hole.

[0010] In one technical solution, a first hole that opens upward is provided at the top of the insulating part, and a second hole that opens downward is provided at the bottom of the insulating part. The first hole and the second hole communicate with each other to jointly form the middle hole. The aperture of the second hole is smaller than that of the first hole, so that a supporting part surrounding the outside of the second hole is formed below the first hole.

[0011] At least part of the transfer piece and at least part of the pole column cover plate are received in the first hole, and the transfer piece abuts against the top surface of the supporting part.

[0012] In one technical solution, a part of the transfer piece is also received in the second hole, and the supporting part is a ring structure. The supporting part surrounds the outer periphery of the transfer piece and clamps the outer side wall of the transfer piece.

[0013] In one technical solution, the top surface of the pole column cover plate does not exceed the top surface of the cover plate body.

[0014] In one technical solution, neither the insulating part nor the transfer piece exceeds the bottom surface of the cover plate body.

[0015] In one technical solution, an insulating layer is provided on the bottom surface of the cover plate body.

[0016] In one technical solution, a groove is provided at the bottom of the pole column cover plate. The groove wall and the top surface of the transfer piece jointly enclose a closed protection space. The lead-out hole communicates with the protection space so that the pole ear can be received in the protection space.

[0017] In one technical solution, each outer side wall of the pole column cover plate abuts against the side surface of the insulating part to cover the top surface of the transfer piece.

[0018] In one technical solution, an extension part protrudes from the top surface of the transfer piece. The extension part is located between the pole column cover plate and the insulating part, and the extension part is used to connect with the pole column cover plate.

[0019] The present application also provides a battery, which includes a housing, an electric core, and the top cover described in any one of the above technical solutions. An opening is provided on the housing, the electric core is received in the housing through the opening, the cover plate body seals the opening, an electrode tab is led out from the electric core, and the electrode tab is connected to the adapter piece after passing through the lead-out hole.

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

[0021] Before assembly, the adapter piece and the insulating member can be pre-installed on the cover plate body. During assembly, the electrode tab of the electric core needs to pass upward through the lead-out hole on the adapter piece, then the electrode tab of the electric core is bent and welded to the top surface of the adapter piece, and finally the pole column cover plate is welded to the top surface of the adapter piece to cover the electrode tab, so as to protect the electrode tab.

[0022] As can be seen from the above paragraph, this solution also adopts the structural design that the electrode tab on the electric core needs to pass upward through the adapter piece, so that there is no need to reserve too much space between the top surface of the cover plate body and the electric core to accommodate the bent electrode tab, which is beneficial to shortening the distance between the top surface of the cover plate body and the top surface of the electric core, so that the battery has more space for the electric core to use at a certain height, so that the battery has a higher energy density; in addition, this solution also accommodates at least part of the adapter piece and at least part of the pole column cover plate in the middle hole of the insulating member, which is beneficial to shortening the distance between the top surface of the pole column cover plate and the top surface of the cover plate body, so that the height of the housing can be made higher at a certain height of the battery, that is, it is beneficial to make the housing have more space for the electric core to use inside, and further beneficial to further improving the energy density of the battery. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative labor.

[0024] Figure 1 It is a schematic structural diagram of a battery provided in Embodiment 1 of the present application;

[0025] Figure 2 It is a top view of the top cover provided in Embodiment 1 of the present application;

[0026] Figure 3 For Figure 2 The cross-sectional view at A-A in

[0027] Figure 4 For Figure 3 The partial enlarged view at B in

[0028] Figure 5 is Figure 3 The partial enlarged view at position C in

[0029] Figure 6 The schematic structural view of the top cover provided by the first embodiment of the present application when viewed from below

[0030] Figure 7 The exploded view of the structure of the top cover provided by the first embodiment of the present application

[0031] Figure 8 The schematic structural view of the insulating member provided by the first embodiment of the present application

[0032] Figure 9 The schematic structural view of the battery provided by the second embodiment of the present application

[0033] Figure 10 is Figure 9 The enlarged view of the internal structure at position D in

[0034] Reference numerals:

[0035] 1, housing; 11, opening; 2, battery cell; 21, tab; 3, top cover; 31, cover body; 311, opening; 312, liquid injection hole; 32, insulating member; 321, middle hole; 322, first hole position; 323, second hole position; 324, support part; 33, pole column assembly; 331, adapter plate; 3311, lead-out hole; 3312, extension part; 332, pole column cover plate; 3321, groove; 333, protection space; 34, explosion-proof valve. Detailed implementation manners

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be 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 the present application and are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed 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.

[0038] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0040] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments.

[0041] Embodiment 1

[0042] Please refer to Figure 1 , the embodiment of the present utility model provides a first type of battery, which mainly includes a housing 1, an electric core 2 and a top cover 3. Among them, an opening 11 is provided on the housing 1, the electric core 2 is loaded into the housing 1 from the opening 11, and the top cover 3 is used to seal the opening 11 to prevent external substances from entering the housing 1, and at the same time prevent the electrolyte inside the housing 1 from leaking outwards.

[0043] Please refer to together Figures 1 to 4 and Figures 6 to 8, the top cover 3 specifically includes a cover plate body 31, an insulating member 32, and at least one pole column assembly 33. Among them, the cover plate body 31 is used to seal the opening 11 mentioned above. The thickness of the cover plate body 31 is between 1.5 mm and 3 mm. A through hole 311 is provided on the cover plate body 31, and the pole column assembly 33 is arranged at this through hole 311. The pole column assembly 33 is used to connect with the pole ear 21 led out from the battery cell 2 to lead out the positive or negative pole of the battery cell 2 outward. Among them, the insulating member 32 is an annular structure with a through middle hole 321 in the middle. The insulating member 32 surrounds the outer periphery of the pole column assembly 33 and is connected to the hole wall of the through hole 311, thereby insulating and separating the pole column assembly 33 and the cover plate body 31, preventing the cover plate body 31 from being charged due to contact with the pole column assembly 33, and reducing the risk of the battery short-circuiting. Among them, the pole column assembly 33 specifically includes a transition piece 331 and a pole column cover plate 332. Both the transition piece 331 and the pole column cover plate 332 are conductive metal parts. Among them, a through lead-out hole 3311 is provided on the transition piece 331. The lead-out hole 3311 is used for the pole ear 21 on the battery cell 2 to pass through upward. The top surface of the transition piece 331 is used for welding the pole ear 21 on the battery cell 2. The pole column cover plate 332 is connected to the top of the transition piece 331. The pole column cover plate 332 is used to cover the pole ear 21, making the pole ear 21 not easily damaged, so as to achieve the purpose of protecting the pole ear 21. Before assembly, the transition piece 331 and the insulating member 32 can be pre-installed on the cover plate body 31. During assembly, the pole ear 21 of the battery cell 2 needs to pass through the lead-out hole 3311 on the transition piece 331 upward, then the pole ear 21 of the battery cell 2 is bent and welded to the top surface of the transition piece 331, and finally the pole column cover plate 332 is welded to the top surface of the transition piece 331 to cover the pole ear 21.

[0044] As can be seen from the above paragraph, this solution also adopts the structural design that the pole ear 21 on the battery cell 2 needs to pass through the transition piece 331 upward, so that there is no need to reserve too much space between the top surface of the cover plate body 31 and the battery cell 2 to accommodate the bent pole ear 21. Therefore, it is beneficial to shorten the distance between the top surface of the cover plate 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, so that the battery has a higher energy density.

[0045] Please refer to again Figure 3 , Figure 4 and Figure 8 , at least part of the transition piece 331 and at least part of the pole column cover plate 332 are both received in the middle hole 321 of the insulating member 32. Through such a design, it is beneficial to further shorten the distance between the top surface of the pole column cover plate 332 and the top surface of the cover plate body 31, so that the height of the housing 1 can be made higher at a certain height of the battery. That is, it is beneficial to have more space in the housing 1 for the battery cell 2 to use, and further beneficial to further improve the energy density of the battery.

[0046] Please refer to againFigure 1 , Figure 3 , Figure 4 and Figure 8 , a first hole 322 that opens upward is provided at the top of the insulating member 32, and a second hole 323 that opens downward is provided at the top of the insulating member 32. The first hole 322 and the second hole 323 communicate with each other to jointly form the above-mentioned middle hole 321. Moreover, the aperture of the second hole 323 is smaller than that of the first hole 322, so that a support portion 324 surrounding the outside of the second hole 323 is formed below the first hole 322. In fact, at least part of the above-mentioned adapter plate 331 and at least part of the pole cover plate 332 are received in the first hole 322. The second hole 323 is mainly used to avoid the tab 21, so that the tab 21 can pass through the second hole 323 and be welded to the adapter plate 331. The adapter plate 331 abuts against the top surface of the support portion 324, so that the pole assembly 33 will not collapse downward as a whole after being installed on the cover body 31, thereby preventing the adapter plate 331 from contacting the top surface of the battery cell 2 and reducing the risk of the battery short-circuiting. At the same time, by providing the support portion 324, there is a larger contact area between the insulating member 32 and the adapter plate 331. Therefore, it is beneficial to further improve the sealing performance between the insulating member 32 and the adapter plate 331, reduce the risk of external substances entering the battery interior, and also reduce the risk of electrolyte leakage to the outside. In addition, by forming the support portion 324 at the bottom of the insulating member 32, there is a relatively sufficient space above the support portion 324 to receive the adapter plate 331 and the pole cover plate 332 on the premise that the thickness of the insulating member 32 is certain, so as to ensure high safety and high energy density of the battery.

[0047] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 8, in addition to a part of the adapter piece 331 being received in the first hole 322, a part of the adapter piece 331 is also received in the second hole 323, so that the adapter piece 331 has sufficient thickness to ensure that the tab 21 will not burn through the adapter piece 331 during the process of welding the tab 21 to the top surface of the adapter piece 331, and at the same time, it also ensures that the pole column cover 332 will not burn through the adapter piece 331 during the process of welding the pole column cover 332 to the top of the adapter piece 331, improving the high reliability of the battery during the manufacturing process. Preferably, the thickness of both the adapter piece 331 and the pole column cover 332 is preferably above 0.75 mm. Based on the structural design that a part of the adapter piece 331 is received in the second hole 323, in this solution, the above-mentioned support portion 324 is designed as an annular structure. In fact, the support portion 324 surrounds the outer periphery of the adapter piece 331 and clamps the outer side wall of the adapter piece 331 to further increase the contact area between the insulating member 32 and the adapter piece 331, thereby being beneficial to further improving the sealing performance between the insulating member 32 and the pole column assembly 33. Preferably, the sealing performance between the insulating member 32 and the cover body 31 and between the insulating member 32 and the pole column assembly 33 can be improved by filling insulating glue.

[0048] Please refer to Figure 1 , Figure 3 and Figure 4 , preferably, the top surface of the pole column cover 332 does not exceed the top surface of the cover body 31, so that it is beneficial to make the height of the housing 1 higher when the total height of the battery is certain, in order to create more height space for the battery cell 2, and further beneficial to further improve the energy density of the battery. In addition, neither the insulating member 32 nor the adapter piece 331 exceeds the bottom surface of the cover body 31, so that the distance between the top surface of the battery cell 2 and the bottom surface of the cover body 31 can be closer, and even the bottom surface of the cover body 31 can directly abut against the battery cell 2, thus being beneficial to having more height space for the battery cell 2 to utilize when the total height of the battery is certain, and further beneficial to further improve the energy density of the battery. When the distance between the cover body 31 and the top surface of the battery cell 2 is very small, in order to prevent the cover body 31 from directly contacting the battery cell 2 and causing a short circuit, an insulating layer can be provided on the bottom surface of the cover body 31, and the thickness of the insulating layer is between 0.001 mm and 0.5 mm. The insulating layer can be realized by coating an insulating paint on the bottom surface of the cover body 31, or the insulating layer can be realized by laying a plastic pad on the bottom of the cover body 31.

[0049] Please refer to again Figure 1 , Figure 3 and Figure 4, a groove 3321 is provided at the bottom of the terminal post cover plate 332. The groove wall of the groove 3321 and the top surface of the adapter piece 331 jointly enclose a closed protection space 333. The lead-out hole 3311 is communicated with the protection space 333, so that after the tab 21 passes upward through the lead-out hole 3311, it can be received in the protection space 333 to prevent the tab 21 from being damaged. As can be seen from the above, by providing the groove 3321 on the terminal post cover plate 332, it is beneficial to form the protection space 333, and the top surface of the adapter piece 331 can be designed as a flat structure convenient for welding the tab 21. In other embodiments, the groove 3321 can also be designed at the top of the adapter piece 331, and then the terminal post cover plate 332 can be designed as a thin sheet structure. At this time, it is also possible to realize that the bottom surface of the terminal post cover plate 332 and the top surface of the adapter piece 331 jointly enclose the protection space 333.

[0050] Please refer to again Figure 1 , Figure 3 and Figure 4 , while covering the tab 21, the terminal post cover plate 332 also covers the top surface of the adapter piece 331. This structure can use the technology of laser penetration welding to weld the terminal post cover plate 332 and the adapter piece 331 together. Based on this structure design, preferably, each outer side wall of the terminal post cover plate 332 abuts against the side surface of the insulating part 32 to improve the sealing performance between the terminal post assembly 33 and the insulating part 32.

[0051] Please refer to Figures 2 to 5 , two terminal post assemblies 33 are provided on the cover plate main body 31 of this embodiment. One terminal post assembly 33 is used to connect with the positive tab on the battery cell 2, and the other terminal post assembly 33 is used to connect with the negative tab on the battery cell 2. The two terminal post assemblies 33 are insulated and separated from the cover plate main body 31 through an insulating part 32 to ensure that the cover plate main body 31 is not electrified. The structures of the two terminal post assemblies 33 here are the same and will not be repeated here. In addition, usually, a liquid injection hole 312 and an explosion-proof valve 34 are also provided on the cover plate main body 31. The liquid injection hole 312 is used for the electrolyte to be injected into the housing 1, and the explosion-proof valve 34 is used for the gas inside the housing 1 to leak out when the battery undergoes thermal runaway, so as to reduce the risk of the battery explosion and improve the safety of the battery.

[0052] Embodiment 2

[0053] Please refer to Figure 9 and Figure 10, this embodiment provides a second battery, which also includes a shell 1, a battery cell 2 and a top cover 3, wherein the top surface of the adapter piece 331 in the pole assembly 33 in the top cover 3 is convexly provided with an extension portion 3312. In fact, the extension portion 3312 is located between the pole cover plate 332 and the insulating member 32, that is, the adapter piece 331 is exposed upward through the extension portion 3312, and the pole cover plate 332 does not completely cover the entire adapter piece 331. Through such a design, the pole cover plate 332 and the adapter piece 331 can be conductively connected by only welding the extension portion 3312 and the pole cover plate 332 together, which has the advantage of facilitating the mutual welding of the pole cover plate 332 and the adapter piece 331, and the effect of welding the pole cover plate 332 on the adapter piece 331 can be more intuitively judged by the naked eye, so as to intuitively judge the reliability of welding the pole cover plate 332 on the adapter piece 331. The other structures are the same as the battery structure described in the first embodiment, so they are not described again in this embodiment.

[0054] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A top cover of a battery, characterized in that, It includes a cover plate body (31), an insulating member (32) and at least one pole column assembly (33); A through hole (311) is provided on the cover plate body (31), the pole column assembly (33) is arranged at the through hole (311), the insulating member (32) is an annular structure with a middle hole (321) in the middle, and the insulating member (32) surrounds the outer periphery of the pole column assembly (33) and is connected to the hole wall of the through hole (311) to insulate and separate the pole column assembly (33) and the cover plate body (31); The pole column assembly (33) includes a transfer piece (331) and a pole column cover plate (332). A through lead-out hole (3311) is provided on the transfer piece (331). The lead-out hole (3311) is used for the pole ear led out from the battery core to pass through upward. The transfer piece (331) is used to connect with the pole ear. The pole column cover plate (332) is connected to the top of the transfer piece (331) and is used to cover the pole ear; At least part of the transfer piece (331) and at least part of the pole column cover plate (332) are received in the middle hole (321).

2. The top cover of the battery according to claim 1, characterized in that, A first hole position (322) that opens upward is provided at the top of the insulating member (32), and a second hole position (323) that opens downward is provided at the bottom of the insulating member (32). The first hole position (322) and the second hole position (323) communicate with each other to jointly form the middle hole (321). The aperture of the second hole position (323) is smaller than that of the first hole position (322), so that a support portion (324) surrounding the outside of the second hole position (323) is formed below the first hole position (322); At least part of the transfer piece (331) and at least part of the pole column cover plate (332) are received in the first hole position (322), and the transfer piece (331) abuts against the top surface of the support portion (324).

3. The top cover of the battery according to claim 2, characterized in that, Part of the transfer piece (331) is also received in the second hole position (323), and the support portion (324) is an annular structure. The support portion (324) surrounds the outer periphery of the transfer piece (331) and clamps the outer side wall of the transfer piece (331).

4. The top cover of the battery according to claim 1, characterized in that, The top surface of the pole column cover plate (332) does not exceed the top surface of the cover plate body (31).

5. The top cover of the battery according to claim 1, characterized in that, Neither the insulating member (32) nor the transfer piece (331) exceeds the bottom surface of the cover plate body (31).

6. The top cover of the battery according to claim 1, characterized in that, An insulating layer is provided on the bottom surface of the cover plate body (31).

7. The top cover of the battery according to claim 1, characterized in that, A groove (3321) is provided at the bottom of the pole column cover plate (332). The groove wall of the groove (3321) and the top surface of the transfer piece (331) jointly enclose a closed protection space (333). The lead-out hole (3311) communicates with the protection space (333) so that the protection space (333) can be used to receive the pole ear.

8. The top cover of the battery according to any one of claims 1 to 7, characterized in that, The pole column cover plate (332) covers the top surface of the transfer piece (331) while covering the pole ear.

9. The top cover of the battery according to any one of claims 1 to 7, characterized in that, The top surface of the adapter piece (331) is convexly provided with an extension part (3312), the extension part (3312) is located between the pole column cover plate (332) and the insulating part (32), and the extension part (3312) is used for connecting with the pole column cover plate (332).

10. A battery, characterized in that, It includes a housing (1), an electric core (2) and the top cover (3) according to any one of claims 1 to 9. An opening (11) is provided on the housing (1), the electric core (2) is received in the housing (1) from the opening (11), the cover plate body (31) seals the opening (11), an electrode tab (21) is led out from the electric core (2), and the electrode tab (21) is connected with the adapter piece (331) after passing through the lead-out hole (3311).

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