Battery top cover assembly and battery

Abstract

The utility model discloses a battery top cover assembly and a battery. The battery top cover assembly comprises a top cover main body, a pole and an adapter plate, the pole column comprises a pole column main body and a pole column cover plate, the pole column main body and the top cover main body are connected in an insulating and sealing manner, a first groove is formed in one surface, facing the battery core, of the pole column main body, a second groove is formed in one surface, back to the battery core, of the pole column main body, and a convex block is convexly arranged on the adapter plate; the lug is used for being inserted into the first groove and connected with the pole main body, and the pole cover plate is accommodated in the second groove and connected with the pole main body; the thickness of the pole main body can be reduced through the two grooves formed in the pole main body, so that the reliability of welding of the pole main body and the switching piece can be ensured through welding from the outer side, in addition, the pole cover plate is contained in the second groove of the pole main body, the pole does not occupy too much height space even if the pole comprises two components, and the reliability of welding of the pole main body and the switching piece is improved. Therefore, the energy density of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery top cover subassembly and battery. BACKGROUND

[0002] In order to meet that the pole can be reliably connected with the adapter piece (used for connecting with the pole lug led out by the battery cell) and can be reliably connected with the external bar piece (used for connecting two batteries in series or parallel), the pole is usually designed as two components welded in parts in the existing battery top cover subassembly, the two components can be called pole main body and pole adapter block respectively, the pole main body is used for welding with the adapter piece, and the pole adapter block is used for welding with the bar piece. Specifically, if the adapter piece is arranged to be welded with the pole main body on the inner side, then in order to realize welding, the pole lug led out by the battery cell needs to be very long, and a lot of space needs to be reserved inside the battery to accommodate the adapter piece and the bent pole lug, which will lead to low space utilization of the internal battery cell and thus low energy density of the battery. Therefore, in order to improve the energy density of the battery, the technical means of welding the pole main body and the adapter piece from the outside is currently adopted to realize the purpose that a lot of space does not need to be reserved inside the battery to accommodate the pole lug, so as to improve the space utilization of the internal battery cell and the energy density of the battery. However, the thickness of the pole main body is relatively thick at present, so the reliability of welding the pole main body and the adapter piece from the outside still needs to be improved. In order to improve the welding reliability of the pole main body and the adapter piece, the current technical means is to provide a through welding hole on the pole main body, and then the adapter piece is exposed outward from the welding hole to realize reliable welding of the pole main body and the adapter piece. However, since the welding hole exists, sealing detection of the welding hole is necessary, which leads to the disadvantages of easy liquid leakage of the battery and high production cost. In addition, the pole main body and the pole adapter block in parts occupy a lot of space in the height direction, which limits the energy density of the battery to a certain extent.

[0003] Therefore, it is necessary to improve the prior art.

[0004] The above information is given as background information only to assist with an understanding of the present disclosure, and does not constitute admission or recognition that any of the above information constitutes prior art with respect to the present disclosure. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of battery top cover subassembly and battery, mainly solve the technical problems that the pole and adapter piece welding reliability of existing battery needs to be improved and pole occupies too much height.

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

[0007] A kind of battery top cover subassembly, including top cover main body, pole and adapter piece;

[0008] The pole post comprises a pole post body and a pole post cover plate, the pole post body and the top cover body are insulated and sealingly connected, the adapter piece is used for electrically connecting with the battery cell, one side of the pole post body facing the battery cell is provided with a first groove, one side of the pole post body away from the battery cell is provided with a second groove, a protruding block is protruded on the adapter piece, the protruding block is used for being inserted into the first groove and connected with the pole post body, and the pole post cover plate is accommodated in the second groove and connected with the pole post body.

[0009] In one of the technical solutions, the second groove is provided with a first welding area and a second welding area, the second welding area is arranged at the periphery of the first welding area, the pole post body and the adapter piece are welded at the first welding area, and the pole post cover plate and the pole post body are welded at the second welding area.

[0010] In one of the technical solutions, the shape of the first welding area is greater than or equal to the shape of the first groove, and the projection of the first welding area towards the battery cell covers the first groove.

[0011] In one of the technical solutions, the adapter piece comprises a first connecting part, a second connecting part and a fuse structure connected between the first connecting part and the second connecting part.

[0012] The first connecting part is used for connecting with the battery cell, and the second connecting part is provided with the protruding block.

[0013] In one of the technical solutions, the first connecting part is provided with a through lead-out hole, the lead-out hole is used for penetrating the tab led out from the battery cell, a receiving gap is arranged between the first connecting part and the side of the top cover body facing the battery cell, and the receiving gap is used for accommodating the tab.

[0014] In one of the technical solutions, the side of the top cover body facing the battery cell is provided with a receiving groove, and the adapter piece is accommodated in the receiving groove.

[0015] In one of the technical solutions, the side of the top cover body facing the battery cell is provided with an insulating layer.

[0016] In one of the technical solutions, the outer surface of the pole post cover plate away from the battery cell is flush with the outer surface of the pole post body away from the battery cell.

[0017] In one of the technical solutions, an annular insulating sealing member is connected between the pole post body and the top cover body, and the outer surface of the pole post body away from the battery cell is flush with the outer surface of the insulating sealing member away from the battery cell.

[0018] The application further provides a battery comprising a shell, an electric core and the battery top cover assembly.

[0019] Compared with the prior art, the battery top cover assembly has at least the following beneficial effects:

[0020] The pole post body and the pole post cover plate of the scheme correspond to two connected components split from the existing pole post, that is, the pole post body is used to connect with the adapter piece, and the pole post cover plate is used to connect with the external bar sheet, the pole post body is provided with a first groove and a second groove, the two grooves can thin the thickness of the pole post body, so that the reliability of welding between the pole post body and the adapter piece after welding from the outside can be improved, in other words, the pole post body does not need to be provided with a penetrating welding hole, and the reliability of welding between the pole post body and the adapter piece after welding can be ensured, so that the risk of battery liquid leakage or external substances entering the battery is reduced. In addition, the second groove on the pole post body can be used to accommodate the pole post cover plate, so that the pole post does not occupy too much height space even if it comprises two components, thereby being beneficial to freeing up more height space for the internal electric core, and further being beneficial to improving the energy density of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 A structural schematic diagram of a battery provided by the embodiment of the present application is shown in the figure.

[0023] Figure 2 A structural exploded view of the battery shown in the figure. Figure 1

[0024] Figure 3 A sectional view of the battery shown in the figure. Figure 1

[0025] Figure 4 A local enlarged view of position A in the figure. Figure 3

[0026] A structural schematic diagram of the battery top cover assembly provided by the embodiment of the present application when viewed from below. Figure 5

[0027] Figure 6 ​​​A structural exploded view of a battery top cover assembly provided by an embodiment of the present application, as viewed from above at a position of a pole post;

[0028] Figure 7 A structural exploded view of a battery top cover assembly provided by an embodiment of the present application, as viewed from below at a position of a pole post;

[0029] Figure 8 A perspective view of a pole post body provided by an embodiment of the present application.

[0030] Reference signs:

[0031] 1, housing; 11, opening; 2, battery cell; 21, tab; 3, battery top cover assembly; 31, top cover body; 311, receiving groove; 32, pole post; 321, pole post body; 3211, first groove; 3212, second groove; 32121, first welding area; 32122, second welding area; 322, pole post cover plate; 33, adapter piece; 331, first connecting portion; 3311, lead-out hole; 332, second connecting portion; 333, fuse structure; 334, protrusion; 34, insulating sealing member; 35, insulating layer; 4, receiving gap. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0033] 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.

[0034] 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.

[0035] 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", etc. 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.

[0036] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will make further detailed description to the utility model in combination with the drawings and examples.

[0037] Please refer to Figure 1 and Figure 2 The utility model embodiment provides a kind of battery, which mainly includes shell 1, electric core 2 and battery top cover assembly 3, wherein, shell 1 is provided with opening 11, electric core 2 is loaded into shell 1 from opening 11, battery top cover assembly 3 is used to seal opening 11, to prevent electrolyte from leaking outwards from opening 11, also prevent external material from entering into shell 1 from opening 11, in addition, electric core 2 is led out with two tabs 21, one of which tab 21 has positive electrode electric property, and the other tab 21 has negative electrode electric property, battery top cover assembly 3 is connected with at least one tab 21, to lead out positive electrode or negative electrode outward.

[0038] Please refer to Figures 1 to 8 Battery top cover assembly 3 specifically includes top cover main body 31, pole 32 and adapter sheet 33, wherein, pole 32 specifically includes pole main body 321 and pole cover plate 322, pole main body 321 and top cover main body 31 are connected by connecting annular insulating sealing element 34 to realize the insulating sealing connection of both, prevent top cover main body 31 and pole main body 321 from contacting conduction, reduce the risk of short circuit of battery, and adapter sheet 33 is used to connect with the tab 21 of electric core 2, adapter sheet 33 is also used to connect with pole main body 321, to realize the indirect connection between pole main body 321 and electric core 2.Specifically, the side of pole main body 321 facing electric core 2 (can be understood as the bottom surface of pole main body 321) is provided with first recess 3211, the side of pole main body 321 away from electric core 2 (can be understood as the top surface of pole main body 321) is provided with second recess 3212, adapter sheet 33 is provided with lug 334, lug 334 is used to be inserted in first recess 3211 and be connected with pole main body 321, and pole cover plate 322 is received in second recess 3212 and is connected with pole main body 321.

[0039] Specifically, the pole post body 321 and the pole post cover plate 322 of the embodiment correspond to two split components of the existing pole post 32, i.e., the pole post body 321 is used to connect with the adapter piece 33, and the pole post cover plate 322 is used to connect with the external gasket. The first groove 3211 and the second groove 3212 provided on the pole post body 321 can thin the thickness of the pole post body 321, so that the reliability of the welding between the pole post body 321 and the adapter piece 33 can be improved after the pole post body 321 and the adapter piece 33 are welded from the outside. In other words, by using the present solution, the pole post body 321 does not need to be provided with a through welding hole, and the reliability of the welding between the pole post body 321 and the adapter piece 33 can be ensured after the welding, thereby reducing the risk of battery leakage or the entry of external substances into the battery. In addition, the second groove 3212 on the pole post body 321 can be used to accommodate the pole post cover plate 322, so that the pole post does not occupy too much height space even if it includes two components, thereby facilitating the release of more height space for the internal battery cells, and further facilitating the improvement of the energy density of the battery.

[0040] In other embodiments, the top cover body 31 can be an injection molded part, and the insulation and sealing piece 34 is not required to connect the pole post body 321 and the top cover body 31 to achieve insulation and sealing connection therebetween.

[0041] Please refer to Figure 6 and Figure 8 , the second groove 3212 is provided with a first welding area 32121 and a second welding area 32122, wherein the second welding area 32122 is provided at the periphery of the first welding area 32121, the first welding area 32121 is used for laser welding between the pole post body 321 and the adapter piece 33, and the second welding area 32122 is used for laser welding between the pole post cover plate 322 and the pole post body 321. By separating the first welding area 32121 and the second welding area 32122, when welding the pole post cover plate 322 and the pole post body 321, the laser will not damage the area where the pole post body 321 and the adapter piece 33 have been welded, thereby ensuring that the pole post body 321 and the adapter piece 33 maintain good welding reliability after the welding is completed.

[0042] Please refer to Figure 6 and Figure 8 , preferably, the shape of the first welding area 32121 is greater than or equal to the shape of the first groove 3211, and the first welding area 32121 is directed towards the battery cell 2 (i.e. Figure 8The projection of the Z direction in the Y-Z plane of the adapter piece 33 covers the first groove 3211. By using this design, it can further ensure that the laser will not damage the area where the adapter piece 33 and the pole body 321 have been welded during the welding process of the pole cover plate 322 and the pole body 321, thereby further ensuring that the pole body 321 and the adapter piece 33 maintain good welding reliability after the welding is completed.

[0043] Please refer to Figure 4 、 Figure 6 and Figure 7 together, the adapter piece 33 specifically includes a first connecting portion 331, a second connecting portion 332, and a fuse structure 333, wherein the fuse structure 333 is connected between the first connecting portion 331 and the second connecting portion 332, the first connecting portion 331 is used to connect with the tab 21 of the battery cell 2, and the second connecting portion 332 is provided with the protrusion 334 described above, that is, the second connecting portion 332 is equivalent to being used to connect with the pole body 321. When the temperature of the battery is too high due to a short circuit, the fuse structure 333 on the adapter piece 33 can be timely fused, thereby disconnecting the connection between the first connecting portion 331 and the second connecting portion 332, that is, disconnecting the connection between the battery cell 2 and the pole 32, thereby greatly reducing the risk of fire and explosion of the battery. Preferably, the first connecting portion 331 is provided with a through lead-out hole 3311, the lead-out hole 3311 is used for the tab 21 of the battery cell 2 to pass through, and a receiving gap 4 is provided between the first connecting portion 331 and the side of the top cover body 31 facing the battery cell 2 (which can be understood as the bottom surface of the top cover body 31). By providing this receiving gap 4, the tab 21 of the battery cell 2 can be welded on the side of the first connecting portion 331 away from the battery cell 2 (which can be understood as the top surface of the first connecting portion 331). By using this design, when the battery top cover assembly 3 seals the opening 11 of the shell 1, the inside of the shell 1 does not need to reserve too much height space for the bent tab 21, thereby facilitating the use of the internal space for the battery cell 2, and further facilitating the improvement of the energy density of the battery. Further preferably, the side of the top cover body 31 facing the battery cell 2 (which can be understood as the bottom surface of the top cover body 31) is provided with a receiving groove 311, and the adapter piece 33 is received in the receiving groove 311, so that the adapter piece 33 also does not occupy the internal space of the shell 1, thereby further reserving height space for the battery cell 2 to use, and further facilitating the improvement of the energy density of the battery. As shown in Figure 7 When the battery cell 2 is very close to the top cover body 31 or even directly abuts against the top cover body 31, in order to prevent the top cover body 31 and the battery cell 2 from being in conductive contact and short-circuiting, an insulating layer 35 can be provided on the side of the top cover body 31 facing the battery cell 2, and the thickness of the insulating layer 35 is preferably 0.001-0.5mm.

[0044] In other embodiments, the lead-out hole 3311 can also not be arranged on the adapter piece 33, and the tab 21 of the battery cell 2 can directly pass through the outside of the adapter piece 33 and be bent and welded on the top of the adapter piece 33.

[0045] Please refer to Figure 4 The outer surface of the pole post cover plate 322 facing away from the battery cell 2 (which can be understood as the top surface of the pole post cover plate 322) is flush with the outer surface of the pole post body 321 facing away from the battery cell 2 (which can be understood as the top surface of the pole post body 321), the outer surface of the pole post body 321 facing away from the battery cell 2 (which can be understood as the top surface of the pole post body 321) is flush with the outer surface of the insulating sealing piece 34 facing away from the battery cell 2 (which can be understood as the top surface of the insulating sealing piece 34), through such a design, the height occupied by the pole post 32 can be reduced as much as possible, thereby facilitating further improvement of the space utilization rate of the battery cell 2, and further facilitating further improvement of the energy density of the battery.

[0046] 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 here, any modification, equivalent replacement and improvement made within the spirit and principle of the present application, and other specific embodiments of the present application that can be thought of by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A battery top cover assembly, characterized by, The top cover body (31), the pole column (32) and the adapter plate (33) are included. The pole column (32) includes a pole column body (321) and a pole column cover plate (322), the pole column body (321) and the top cover body (31) are insulated and sealedly connected, the adapter plate (33) is electrically connected with the battery cell, a first groove (3211) is arranged on a side of the pole column body (321) facing the battery cell, a second groove (3212) is arranged on a side of the pole column body (321) away from the battery cell, a protruding block (334) is protruded on the adapter plate (33), the protruding block (334) is inserted into the first groove (3211) and connected with the pole column body (321), and the pole column cover plate (322) is accommodated in the second groove (3212) and connected with the pole column body (321).

2. The battery cover assembly of claim 1, wherein the cover is made of a material selected from the group consisting of: a metal, a plastic, and a composite material. The second groove (3212) is provided with a first welding area (32121) and a second welding area (32122), the second welding area (32122) is arranged at the periphery of the first welding area (32121), the pole column body (321) and the adapter plate (33) are welded at the first welding area (32121), and the pole column cover plate (322) and the pole column body (321) are welded at the second welding area (32122).

3. The battery cover assembly of claim 2, wherein the battery cover assembly is configured to be mounted to a battery cover of a battery pack. The shape of the first welding area (32121) is greater than or equal to the shape of the first groove (3211), and the projection of the first welding area (32121) towards the battery cell covers the first groove (3211).

4. The battery cover assembly of claim 2, wherein the battery cover assembly is configured to be mounted to a battery cover of a battery pack, and the battery cover assembly is configured to be mounted to a battery pack cover of a battery pack. The adapter plate (33) includes a first connecting part (331), a second connecting part (332) and a fuse structure (333) connected between the first connecting part (331) and the second connecting part (332). The first connecting part (331) is connected with the battery cell, and the second connecting part (332) is provided with the protruding block (334).

5. The battery cover assembly of claim 4, wherein the cover is made of a material selected from the group consisting of: aluminum, steel, and plastic. A receiving gap (4) is arranged between the first connecting part (331) and a side of the top cover body (31) facing the battery cell, and the receiving gap (4) accommodates a tab.

6. The battery cup cover assembly of claim 1, wherein the battery cup cover assembly is configured to be mounted to a battery pack. A receiving groove (311) is arranged on a side of the top cover body (31) facing the battery cell, and the adapter plate (33) is accommodated in the receiving groove (311).

7. The battery cover assembly of claim 1, wherein the cover is made of a material selected from the group consisting of: aluminum, steel, and plastic. An insulating layer (35) is arranged on a side of the top cover body (31) facing the battery cell.

8. The battery cover assembly of any one of claims 1 to 7, wherein, An outer surface of the pole column cover plate (322) away from the battery cell is flush with an outer surface of the pole column body (321) away from the battery cell.

9. The battery cover assembly of any one of claims 1 to 7, wherein, An annular insulating sealing member (34) is connected between the pole column body (321) and the top cover body (31), and an outer surface of the pole column body (321) away from the battery cell is flush with an outer surface of the insulating sealing member (34) away from the battery cell.

10. A battery, characterized by The battery top cover assembly (3) of any one of claims 1 to 9, wherein a housing (1) is provided with an opening (11), an electric core (2) is accommodated in the housing (1) from the opening (11), and the top cover body (31) seals the opening (11).

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