Top cover module and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a top cover module and a battery, the top cover module comprises a top cover sheet, a pole assembly, a riveting piece, a pole pad and an insulating piece, the top cover sheet is provided with a pole hole, the pole assembly comprises a pole body and a welding piece, the welding piece is welded at one end of the pole body, the pole body is arranged in the pole hole in a penetrating manner, and the riveting piece is connected with the pole pad. The welding piece is used for being connected with a tab of a core package, the number of welding areas of the welding piece and the same tab of the core package is at least two, the riveting piece is connected to the other end of the pole body, the riveting piece and the welding piece are located on the two sides of the top cover piece respectively, and the pole pad is clamped between the riveting piece and the top cover piece. The insulating piece is clamped between the welding piece and the top cover piece so that the welding piece and the top cover piece can be arranged in an insulating mode. The top cover module is simple in structure and low in manufacturing cost, the thickness of the whole top cover module is small, the energy density of the battery can be improved, the over-current capability of the whole top cover module is high, and the performance of the battery can be improved.

Description

Technical Field

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

[0002] At present, the technological innovation of square battery structure is mainly concentrated on the battery top cover and the components connected to it. The existing riveted battery top cover usually includes a top cover sheet, an upper plastic, a lower plastic, and a pole piece that is inserted through the top cover sheet. During the actual assembly process, the lower plastic is connected to the lower surface of the top cover sheet, the upper plastic is installed on the upper surface of the top cover sheet, and the rivet is placed on the upper plastic. The seal is then placed on the pole piece. The pole piece passes through the lower plastic and the upper plastic from the bottom of the top cover sheet and is then connected to the rivet. Finally, the upper end of the pole body is welded to the rivet by riveting to complete the assembly of the battery top cover. In the process of connecting the battery top cover to the core pack, the tab connecting piece is welded to the tab of the core pack. After welding, the tab connecting piece is welded to the lower surface of the pole piece. The pole piece of this riveted battery top cover usually adopts a machined one-piece structure and includes a pole part with a small diameter and a large welding part. The pole part is used for riveting with the riveted part, and the welding part is used for welding with the connecting piece, resulting in great waste in the production process of the pole body, increasing the manufacturing cost, and the additional connecting piece will cause the thickness of the entire battery top cover to be larger and the current flow capacity to be limited. Utility Model Content

[0003] The first purpose of the present utility model is to provide a top cover module, which has a simple structure and low manufacturing cost. The thickness of the entire top cover module is small, which is conducive to improving the energy density of the battery. The entire top cover module has a strong current flow capacity, which is conducive to improving battery performance.

[0004] The second object of the present invention is to provide a battery with a simple structure, low manufacturing cost, high energy density and good charge and discharge performance.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The utility model discloses a top cover module, comprising: a top cover sheet, on which a pole hole is provided; a pole assembly, wherein the pole assembly comprises a pole body and a welding piece, the welding piece is welded to one end of the pole body, the pole body is passed through the pole hole, the welding piece is used to be connected to the pole ear of a core package, and the welding piece has at least two welding areas with the same pole ear of the core package; a rivet, wherein the rivet is connected to the other end of the pole body, and the rivet and the welding piece are respectively located on both sides of the top cover sheet; a pole pad, wherein the pole pad is clamped between the rivet and the top cover sheet; and an insulating piece, wherein the insulating piece is clamped between the welding piece and the top cover sheet so that the welding piece and the top cover sheet are insulated.

[0007] In some embodiments, the welding piece has a pole assembly hole provided therethrough, one end of the pole body is inserted into the pole assembly hole, and the pole body is connected to an assembly edge of the pole assembly hole by welding.

[0008] In some specific embodiments, the welding piece is provided with a welding groove surrounding the pole assembly hole, the pole body has a welding boss corresponding to the welding groove, and a weld is formed between the outer wall of the welding boss and the inner wall of the welding groove.

[0009] In some embodiments, at least two of the welding regions are located on both sides of a connection region between the pole body and the welding piece.

[0010] In some embodiments, the top cover module also includes a seal, which is sleeved on the pole body, a portion of the seal is pressed between the outer peripheral wall of the pole body and the inner peripheral wall of the pole hole, and the other portion is pressed between the pole body and / or the welding part and the surface of the top cover sheet facing the welding part; wherein: a first exhaust channel connected to the pole hole is formed between the rivet and the pole pad, and / or a second exhaust channel connected to the pole hole is formed between the insulating part and the top cover sheet.

[0011] In some embodiments, the pole pad has a first mounting groove, the rivet has a connected stop portion and a convex ring portion, the stop portion is installed in the first mounting groove, and the convex ring portion stops at the surface of the pole pad where the first mounting groove is set; and / or: the pole pad has an insulating convex ring extending into the pole hole, and the insulating convex ring is pressed between the outer wall of the pole body and the inner wall of the pole hole.

[0012] In some embodiments, the top cover sheet is provided with a pole hole, the pole body, the rivet and the weld are one, and constitute the positive pole or negative pole of the battery; or: the top cover sheet is provided with two pole holes set at intervals, the pole body, the rivet and the weld are two, and constitute the positive pole and the negative pole respectively.

[0013] In some specific embodiments, the pole body of the negative pole includes a negative pole riveting portion and a negative pole welding portion, the negative pole riveting portion is connected to the riveted part and is made of the same material as the riveted part, and the negative pole welding portion is connected to the welding part and is made of the same material as the welding part; wherein: the insulating part has a support portion on the side facing away from the top cover sheet, and the negative pole welding part is provided with a support step corresponding to the support portion, and the support step and the support portion both stop at the welding part.

[0014] In some embodiments, the top cover sheet is provided with two pole holes spaced apart from each other, and there are two pole bodies, two rivets, and two welded parts; the top cover module is also provided with an anti-foolproof structure, which is used to distinguish the polarity of the pole body that cooperates with the pole hole.

[0015] The present utility model also discloses a battery, comprising a shell, a core pack and the top cover module described above, wherein the shell has a mounting cavity, the mounting cavity has an open end, the core pack is arranged in the shell, the top cover module is buckled into the open end of the mounting cavity, and the welding part of the top cover module is connected to the pole ear of the core pack.

[0016] The beneficial effects of the top cover module of the present invention are as follows: compared to the prior art where the tab connecting piece and the core pack have only one weld mark, the welding part of this embodiment has at least two welding areas with the same tab of the core pack, thereby improving the flow capacity of the entire top cover module. Moreover, if the same flow capacity as the prior art is to be achieved, the size of the welding part of this embodiment can be smaller than the tab connecting piece in the prior art, thereby helping to reduce the manufacturing cost of the top cover module. At the same time, in the actual assembly process, the two separate structures of the pole body and the welding part are connected to form the entire pole assembly. On the one hand, compared to the prior art where the pole part and the welding part are integrally formed by machining, the pole assembly of this embodiment can be manufactured with less raw materials, thereby reducing the manufacturing cost of the pole assembly. On the other hand, the welding part, which is part of the pole assembly, is directly welded to the tab of the core pack, eliminating the need for the tab connecting piece in the prior art, thereby reducing the thickness of the top cover module, thereby helping to improve the energy density of the battery.

[0017] The beneficial effects of the battery of the present invention are as follows: due to the top cover module described above, the battery has a simple structure, low manufacturing cost, high energy density and good charge and discharge performance.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the top cover module of the first embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the exploded structure of the top cover module of the first embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of welding the top cover module and the core package tab in the first embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the decomposition of the top cover module at the positive column assembly of the first embodiment of the present invention

[0023] Figure 5 This is a schematic diagram of the decomposition of the top cover module at the negative pole assembly of the first embodiment of the present invention.

[0024] Figure 6 This is a cross-sectional view of the top cover module at the positive electrode column assembly of the first embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the top cover module at the negative electrode column assembly of the first embodiment of the present invention;

[0026] Figure 8 This is a schematic structural diagram of the positive electrode body of the first embodiment of the present invention;

[0027] Figure 9 This is a schematic structural diagram of the negative electrode body of the first embodiment of the present invention;

[0028] Figure 10 This is a schematic structural diagram of the positive electrode welding member of the first embodiment of the present utility model;

[0029] Figure 11 This is a schematic structural diagram of the negative electrode welding member of the first embodiment of the present utility model;

[0030] Figure 12 This is a schematic structural diagram of the positive electrode post rivet according to the first embodiment of the present invention;

[0031] Figure 13 This is a schematic structural diagram of the negative electrode post rivet according to the first embodiment of the present invention;

[0032] Figure 14 It is a structural schematic diagram of the insulating component of the first embodiment of the present utility model.

[0033] Figure 15 It is a schematic diagram of the exploded structure of the battery of the fourth embodiment of the present utility model.

[0034] Reference numerals:

[0035] 10. Top cover module;

[0036] 100, top cover; 101, positive electrode post hole; 102, negative electrode post hole; 103, second positive electrode mounting slot; 1031, positive electrode foolproof groove; 104, second negative electrode mounting slot; 1041, negative electrode foolproof groove; 105, explosion-proof valve mounting hole; 106, injection hole;

[0037] 210, positive electrode column assembly; 211, positive electrode column body; 2111, positive electrode welding boss; 2112, positive electrode rivet portion; 21121, positive electrode rivet groove; 2113, positive electrode welding portion; 212, positive electrode welding piece; 2121, positive electrode welding area; 2122, positive electrode column assembly hole; 2123, positive electrode welding groove; 2124, positive electrode anti-fouling surface;

[0038] 220, negative electrode column assembly; 221, negative electrode column body; 2211, negative electrode rivet portion; 22111, negative electrode rivet groove; 2212, negative electrode welding portion; 22121, negative electrode welding boss; 22122, support step; 222, negative electrode welding piece; 2221, negative electrode welding area; 2222, negative electrode column assembly hole; 2223, negative electrode welding groove; 2224, negative electrode anti-fouling surface;

[0039] 310, positive electrode rivet; 311, positive electrode stop portion; 3111, first positive electrode sub-channel; 312, positive electrode convex ring portion; 320, negative electrode rivet; 321, negative electrode stop portion; 3211, first negative electrode sub-channel; 322, negative electrode convex ring portion;

[0040] 410, positive electrode pad; 411, first positive electrode mounting groove; 412, second positive electrode sub-channel; 413, positive electrode insulating protrusion ring; 420, negative electrode pad; 421, first negative electrode mounting groove; 422, second negative electrode sub-channel; 423, negative electrode insulating protrusion ring;

[0041] 500, insulating member; 510, supporting portion; 511, annular convex edge; 512, supporting rib; 520, positive electrode perforation; 530, negative electrode perforation; 540, second positive electrode exhaust channel; 550, second negative electrode exhaust channel; 560, positive electrode anti-mistake convex edge; 570, negative electrode anti-mistake convex edge; 580, positive electrode positioning convex edge; 590, negative electrode positioning convex edge;

[0042] 610, positive electrode seal; 611, first positive electrode seal ring; 612, second positive electrode seal ring;

[0043] 620, negative electrode seal; 621, first negative electrode seal ring; 622, second negative electrode seal ring;

[0044] 700, explosion-proof valve; 800, explosion-proof valve patch;

[0045] 20. Core package; 201. Positive ear; 202. Negative ear; 30. Shell; 40. Top cover patch; 50. Insulation film; 60. Bottom support sheet; 70. Protective film; 80. Sealing pin; 90. Sealing patch. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0047] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0050] The top cover module 10 disclosed in the present invention has a variety of structural forms according to the number of pole holes on the top cover sheet 100 and the number of pole assemblies, rivets, and pole pads. In the following description, the structure of the top cover module 10 of the present invention is specifically and detailedly analyzed by taking the example of two pole holes provided on the top cover sheet 100 and two corresponding pole assemblies, rivets, and pole pads. The remaining structural forms are briefly described.

[0051] Example 1:

[0052] For the convenience of description, the two pole holes are referred to as the positive pole hole 101 and the negative pole hole 102, the two pole assemblies are referred to as the positive pole assembly 210 and the negative pole assembly 220, the two rivets are referred to as the positive pole rivet 310 and the negative pole rivet 320, and the two pole pads are referred to as the positive pole pad 410 and the negative pole pad 420.

[0053] The utility model discloses a top cover module 10, referring to Figure 1-Figure 3 As shown, the top cover module 10 includes a top cover sheet 100, a positive electrode column assembly 210, a negative electrode column assembly 220, a positive electrode rivet 310, a negative electrode rivet 320, a positive electrode column gasket 410, a negative electrode column gasket 420, and an insulating member 500. The top cover sheet 100 is provided with a positive electrode column hole 101 and a negative electrode column hole 102. The top cover sheet 100 is also provided with an explosion-proof valve mounting hole 105, in which an explosion-proof valve 700 is mounted. An explosion-proof valve patch 800 covering the explosion-proof valve 700 is attached to the top cover sheet 100. The positive electrode column assembly 210 (negative electrode column assembly 220) includes a positive electrode column body 211 (negative electrode column body 221) and a positive electrode welding piece 212 (negative electrode welding piece 222), the positive electrode welding piece 212 (negative electrode welding piece 222) is welded to one end of the positive electrode column body 211 (negative electrode column body 221), the positive electrode column body 211 (negative electrode column body 221) is passed through the positive electrode column hole 101 (negative electrode column hole 102), the positive electrode welding piece 212 (negative electrode welding piece 222) is used to be connected to the positive electrode ear 201 (negative electrode ear 202) of the core package 20, and the positive electrode welding piece 212 (negative electrode welding piece 222) is connected to the positive electrode welding area 2121 (negative electrode welding area 2122) of the core package 20. 2221) are at least two, the positive electrode rivet 310 (negative electrode rivet 320) is connected to the other end of the positive electrode column body 211 (negative electrode column body 221), and the positive electrode rivet 310 (negative electrode rivet 320) and the positive electrode welding piece 212 (negative electrode welding piece 222) are respectively located on both sides of the top cover sheet 100; the positive electrode column pad 410 (negative electrode column pad 420) is clamped between the positive electrode rivet 310 (negative electrode rivet 320) and the top cover sheet 100, and the insulating piece 500 is clamped between the positive electrode welding piece 212 (negative electrode welding piece 222) and the top cover sheet 100 so that the positive electrode welding piece 212 (negative electrode welding piece 222) and the top cover sheet 100 are insulated.

[0054] It is understood that because the positive electrode welding member 212 (negative electrode welding member 222) of this embodiment has at least two positive electrode welding areas 2121 (negative electrode welding area 2221) with the core pack 20, compared to the prior art where the tab connection sheet and the core pack only have one weld mark, the positive electrode welding member 212 (negative electrode welding member 222) of this embodiment and the positive tab 201 (negative tab 202) of the core pack 20 have at least two positive electrode welding areas 2121 (negative electrode welding area 2221), thereby improving the flow capacity of the entire top cover module 10. Moreover, to achieve the same flow capacity as the prior art, the size of the positive electrode welding member 212 (negative electrode welding member 222) of this embodiment can be smaller than the tab connection sheet in the prior art, which helps reduce the manufacturing cost of the top cover module 10. At the same time, during the actual assembly process, the two separate structures of the positive electrode column body 211 (negative electrode column body 221) and the positive electrode welding part 212 (negative electrode welding part 222) are connected to form the entire positive electrode column assembly 210 (negative electrode column assembly 220). On the one hand, compared with the prior art method of using machining to achieve the integral molding of the electrode portion and the positive electrode welding part 2113, the positive electrode column assembly 210 (negative electrode column assembly 220) of this embodiment can be manufactured using fewer raw materials, thereby reducing the manufacturing cost of the positive electrode column assembly 210 (negative electrode column assembly 220). On the other hand, as part of the positive electrode column assembly 210 (negative electrode column assembly 220), the positive electrode welding part 212 (negative electrode welding part 222) is directly welded to the positive electrode tab 201 (negative electrode tab 202) of the core pack 20, eliminating the need for the tab connecting piece in the prior art, reducing the thickness of the top cover module 10, thereby facilitating the improvement of the energy density of the battery.

[0055] refer to Figure 3As shown, the positive electrode welding member 212 (negative electrode welding member 222) is connected to both core packs 20 simultaneously. One positive electrode welding member 212 (negative electrode welding member 222) is welded to both positive electrode tabs 201 (negative electrode tabs 202) of the two core packs 20, respectively. That is, one positive electrode welding member 212 (negative electrode welding member 222) has four positive electrode welding regions 2121 (negative electrode welding regions 2221), and two positive electrode welding regions 2121 (negative electrode welding regions 2221) form a group. The two positive electrode welding regions 2121 (negative electrode welding regions 2221) in the same group are located on either side of the positive electrode connection region (negative electrode connection region) of the positive electrode column body 211 (negative electrode column body 221) and the positive electrode welding member 212 (negative electrode welding member 222). It can be understood that in this embodiment, the single-side overcurrent structure of the pole in the prior art is changed to a double-side overcurrent structure of the pole, which greatly improves the overcurrent capacity of the top cover module 10 of this embodiment, thereby helping to improve user satisfaction. It should be noted that the two positive electrode welding areas 2121 (negative electrode welding areas 2221) can be symmetrically arranged with respect to the positive electrode connection area (negative electrode connection area), or they can be asymmetrically arranged. The two positive electrode welding areas 2121 (negative electrode welding areas 2221) can be as follows: Figure 3 It is shown as being located on the left and right sides of the positive electrode connection region (negative electrode connection region), but may also be located on only one side of the positive electrode connection region (negative electrode connection region).

[0056] It should be noted that in an alternative embodiment of the present invention, the number of positive electrode welding regions 2121 (negative electrode welding regions 2221) can also be three, with two positive electrode welding regions 2121 (negative electrode welding regions 2221) located on the left and right sides of the positive electrode connection region (negative electrode connection region), and the remaining positive electrode welding region 2121 (negative electrode welding region 2221) located above or below the positive electrode connection region (negative electrode connection region). The number and distribution of the two positive electrode welding regions 2121 (negative electrode welding regions 2221) can be selected based on the actual current capacity of the top cover module 10.

[0057] It should be additionally explained that, in the actual welding process, the welding form of the positive electrode welding part 212 (negative electrode welding part 222) and the positive electrode ear 201 (negative electrode ear 202) of the core package 20 varies according to the number of core packages 20. If, in the actual assembly process, a top cover module 10 is set corresponding to one core package 20, a positive electrode welding part 212 (negative electrode welding part 222) is only welded to one positive electrode ear 201 (negative electrode ear 202), then a positive electrode welding part 212 (negative electrode welding part 222) requires at least two positive electrode welding areas 2121 (negative electrode welding area 2221). When a top cover module 10 is set corresponding to two core packs 20, then a positive electrode welding part 212 (negative electrode welding part 222) needs to be welded to two positive electrode ears 201 (negative electrode ears 202) at the same time. At this time, a positive electrode welding part 212 (negative electrode welding part 222) requires at least four positive electrode welding areas 2121 (negative electrode welding areas 2221), and a positive electrode ear 201 (negative electrode ear 202) corresponds to at least two positive electrode welding areas 2121 (negative electrode welding areas 2221).

[0058] Optional, reference Figure 4-Figure 5 As shown, the insulating member 500 is provided with a positive pole positioning protrusion 580 (negative pole positioning protrusion 590), and the top cover sheet 100 is provided with a positive pole positioning groove (negative pole positioning groove). The positive pole positioning protrusion 580 (negative pole positioning protrusion 590) and the positive pole positioning groove (negative pole positioning groove) cooperate. This facilitates the positioning of the top cover sheet 100 and the insulating member 500, and prevents the insulating member 500 from shaking relative to the top cover sheet 100. Of course, in other embodiments, the positive pole positioning protrusion 580 (negative pole positioning protrusion 590) can be provided on the top cover sheet 100, and the positive pole positioning groove (negative pole positioning groove) can be provided on the insulating member 500.

[0059] refer to Figure 4-Figure 7As shown, the positive electrode welding part 212 (negative electrode welding part 222) has a positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222) set through it, one end of the positive electrode column body 211 (negative electrode column body 221) is inserted into the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222), and the positive electrode column body 211 (negative electrode column body 221) is welded to the assembly edge of the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222). It can be understood that in the actual assembly process, it is only necessary to insert one end of the positive electrode column body 211 (negative electrode column body 221) into the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222), and then weld the assembly edges of the positive electrode column body 211 (negative electrode column body 221) and the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222) corresponding to the bottom wall of the positive electrode welding part 212 (negative electrode welding part 222). The positive electrode column body 211 (negative electrode column body 221) can be welded to the positive electrode welding part 212 (negative electrode welding part 222). The connection is very convenient and the connection method is reliable, ensuring the structural stability of the entire positive electrode column assembly 210 (negative electrode column assembly 220).

[0060] Further, refer to Figure 10-11 As shown, the positive electrode welding member 212 (negative electrode welding member 222) is provided with a positive electrode welding groove 2123 (negative electrode welding groove 2223) surrounding the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222), referring to Figure 8-Figure 9As shown, the positive electrode column body 211 (negative electrode column body 221) has a positive electrode welding boss 2111 (negative electrode welding boss 22121) arranged corresponding to the positive electrode welding groove 2123 (negative electrode welding groove 2223), and a weld is formed between the outer wall of the positive electrode welding boss 2111 (negative electrode welding boss 22121) and the inner wall of the positive electrode welding groove 2123 (negative electrode welding groove 2223). It can be understood that in the actual welding process, the positive electrode column body 211 (negative electrode column body 221) is first inserted into the positive electrode column assembly hole 2122 (negative electrode column assembly hole 2222), so that the positive electrode welding boss 2111 (negative electrode welding boss 22121) extends into the positive electrode welding groove 2123 (negative electrode welding groove 2223), and the bottom wall of the positive electrode welding boss 2111 (negative electrode welding boss 22121) is flush with the bottom wall of the positive electrode welding part 212 (negative electrode welding part 222). In this way, a gap can be formed between the outer wall of the positive electrode welding boss 2111 (negative electrode welding boss 22121) and the inner wall of the positive electrode welding groove 2123 (negative electrode welding groove 2223). During the welding process, it is only necessary to fill solder into this gap to form a weld. That is, by providing the positive electrode welding boss 2111 (negative electrode welding boss 22121) and the positive electrode welding groove 2123 (negative electrode welding groove 2223), pre-positioning during the welding process can be achieved, and weld formation can be facilitated, thereby preventing the weld formed after the positive electrode welding member 212 (negative electrode welding member 222) is welded to the positive electrode column body 211 (negative electrode column body 221) from protruding. The provision of the positive electrode welding member 212 (negative electrode welding member 222) improves the aesthetics and avoids the adverse effects of a protruding weld when connecting the positive electrode welding member 212 (negative electrode welding member 222) to the positive electrode tab 201 (negative electrode tab 202) of the core pack 20. It should be noted that the welding method can be laser welding or other welding processes, and the welding method is not specifically limited here.

[0061] refer to Figure 8 As shown, the positive electrode column body 211 includes an integrally formed positive electrode rivet portion 2112 and a positive electrode welding portion 2113, and a positive electrode rivet groove 21121 is formed on the positive electrode rivet portion 2112. Figure 12 As shown, the positive electrode rivet 310 has a positive electrode embedding portion that is embedded in the positive electrode rivet groove 21121. It is understandable that in the actual connection process, the positive electrode rivet 310 is first placed on the positive electrode rivet portion 2112 and abutted against the bottom wall of the positive electrode rivet groove 21121. Then, the positive electrode rivet 310 is riveted so that a portion of the positive electrode rivet 310 is embedded in the positive electrode rivet groove 21121 to form the positive electrode embedding portion. In this way, the connection stability between the positive electrode column body 211 and the positive electrode rivet 310 can be improved. Optionally, the material of the positive electrode column body 211 is aluminum, and the material of the positive electrode rivet 310 is aluminum.

[0062] refer to Figure 9 As shown, the negative electrode column body 221 includes an integrally formed negative electrode rivet portion 2211 and a negative electrode welding portion 2212. The negative electrode rivet portion 2211 is connected to the negative electrode rivet 320 and is made of the same material as the negative electrode rivet 320. The negative electrode welding portion 2212 is connected to the negative electrode welding member 222 and is made of the same material as the negative electrode welding member 222. It can be understood that the negative electrode rivet portion 2211 is connected to the negative electrode rivet 320 and is made of the same material as the negative electrode rivet 320, which can facilitate the riveting connection between the negative electrode column body 221 and the negative electrode rivet 320. The negative electrode welding portion 2212 is connected to the negative electrode welding member 222 and is made of the same material as the welding member, which can facilitate the welding connection between the negative electrode column body 221 and the negative electrode.

[0063] Optionally, the negative electrode rivet portion 2211 and the negative electrode rivet part 320 are both made of aluminum, and the negative electrode welding portion 2212 and the negative electrode welding part 222 are made of copper. The processing technology of the negative electrode column body 221 is simplified from the existing technology of friction welding the copper plate and aluminum rod and then machining it to a copper-aluminum composite material processed by a stamping process. The raw materials can be plates or coils.

[0064] Optional, reference Figure 9 As shown, the negative electrode rivet portion 2211 has a negative electrode rivet groove 22111, referring to Figure 13 As shown, the negative electrode rivet 320 has a negative electrode embedding portion that is embedded in the negative electrode rivet groove 22111. It is understood that during the actual connection process, the negative electrode rivet 320 is first placed on the negative electrode rivet portion 2211 and abutted against the bottom wall of the negative electrode rivet groove 22111. The negative electrode rivet 320 is then riveted and pressed, so that a portion of the negative electrode rivet 320 is embedded in the negative electrode rivet groove 22111 to form the negative electrode embedding portion. This improves the connection stability between the negative electrode post body 221 and the negative electrode rivet 320.

[0065] Optionally, the negative electrode column body 221 includes an integrally formed negative electrode rivet portion 2211 and a negative electrode welding portion 2212. The negative electrode rivet portion 2211 is connected to the negative electrode rivet member 320 and is made of aluminum. The negative electrode welding portion 2212 is connected to the negative electrode welding member 222 and is made of copper. The insulating member 500 has a support portion 510 on the side facing away from the top cover sheet 100. The negative electrode welding portion 2212 is provided with a support step 22122 corresponding to the support portion 510. The support step 22122 and the support portion 510 both abut against the negative electrode welding member 222. It is understood that during the welding process, the negative electrode welding piece 222 can be stopped against the support step 22122 and the support portion 510. Both the support step 22122 and the support portion 510 can support the negative electrode welding piece 222 during laser welding, ensuring that the negative electrode welding piece 222 does not deform during the welding process between the negative electrode welding piece 222 and the negative electrode tab 202 of the core package 20. Further optionally, the support portion 510 includes an annular flange 511. The edge range of the annular flange 511 is similar to the edge range of the negative electrode welding piece 222, with a size difference of no more than 1 mm. The annular flange 511 is also provided with multiple support ribs 512 to ensure that the welding piece does not deform during laser welding.

[0066] Optionally, the material of the positive electrode welding part 212 is aluminum, the material of the negative electrode welding part 222 is copper, and the thickness of the positive electrode welding part 212 is thicker than that of the negative electrode welding part 222. The specific thickness needs to be confirmed based on the overcurrent requirements of the positive electrode welding part 212 and the negative electrode welding part 222. The minimum thickness difference is 0.2 mm.

[0067] refer to Figure 2 、 Figure 4 and Figure 5 As shown, the top cover module 10 also includes a positive electrode seal 610 (negative electrode seal 620), which is sleeved on the positive electrode column body 211 (negative electrode column body 221), and a portion of the positive electrode seal 610 (negative electrode seal 620) is pressed between the outer peripheral wall of the positive electrode column body 211 (negative electrode column body 221) and the inner peripheral wall of the positive electrode column hole 101 (negative electrode column hole 102), and the other portion is pressed between the positive electrode column body 211 (negative electrode column body 221) and the surface of the top cover sheet 100 facing the positive electrode welding part 212 (negative electrode welding part 222). It can be understood that the additional positive electrode seal 610 and negative electrode seal 620 can ensure the connection sealing between the top cover module 10 and the positive electrode column assembly 210 (negative electrode column assembly 220), and ensure that when the top cover module 10 is installed on the battery shell 30, the internal space of the shell 30 is isolated from the outside, thereby improving the sealing of the top cover module 10.

[0068] Optional, reference Figure 4-Figure 5As shown, the positive electrode seal 610 (seal) includes a first positive electrode sealing ring 611 (first negative electrode sealing ring 621) and a second positive electrode sealing ring 612 (second negative electrode sealing ring 622). The first positive electrode sealing ring 611 (first negative electrode sealing ring 621) is pressed between the outer peripheral wall of the positive electrode column body 211 (negative electrode column body 221) and the inner peripheral wall of the positive electrode column hole 101 (negative electrode column hole 102), and the second positive electrode sealing ring 612 (second negative electrode sealing ring 622) is pressed between the positive electrode column body 211 (negative electrode column body 221) and the surface of the top cover sheet 100 facing the positive electrode welding part 212 (negative electrode welding part 222).

[0069] Further optional, refer to Figure 8 As shown, the positive electrode column body 211 includes an integrally formed positive electrode rivet portion 2112 and a positive electrode welding portion 2113. The size of the positive electrode welding portion 2113 is larger than the size of the positive electrode rivet portion 2112. The positive electrode seal 610 is sleeved on the positive electrode rivet portion 2112. The bottom wall of the second positive electrode sealing ring 612 stops at the positive electrode rivet portion 2112, and the second positive electrode sealing ring 612 is compressed between the positive electrode rivet portion 2112 and the top cover sheet 100. In this way, the sealing effect of the positive electrode seal 610 can be further improved. It should be noted that in an alternative embodiment, according to sealing requirements, when the size of the positive electrode seal 610 is relatively large and the outer ring diameter of the second positive electrode sealing ring 612 is larger than the diameter of the positive electrode welding portion 2113, the second positive electrode sealing ring 612 is compressed between the positive electrode rivet portion 2112, the positive electrode welding member 212 and the top cover sheet 100.

[0070] Further optional, refer to Figure 9 As shown, the negative electrode column body 221 includes an integrally formed negative electrode rivet portion 2211 and a negative electrode welding portion 2212. The size of the negative electrode welding portion 2212 is larger than that of the negative electrode rivet portion 2211. The negative electrode seal 620 is sleeved on the negative electrode rivet portion 2211. The bottom wall of the second negative electrode sealing ring 622 stops at the negative electrode welding portion 2212 and is clamped between the negative electrode welding portion 2212 and the top cover sheet 100. In this way, the sealing effect of the negative electrode seal 620 can be further improved. It should be noted that in an alternative embodiment, according to sealing requirements, when the size of the negative electrode seal 620 is relatively large and the outer ring diameter of the second negative electrode sealing ring 622 is larger than the diameter of the negative electrode welding portion 2212, the second negative electrode sealing ring 622 is compressed between the negative electrode welding portion 2212, the negative electrode welding member 222 and the top cover sheet 100.

[0071] Optional, reference Figure 12 and Figure 13As shown, a first positive electrode exhaust channel (first negative electrode exhaust channel) connected to the positive electrode column hole 101 (negative electrode column hole 102) is formed between the positive electrode rivet 310 (negative electrode rivet 320) and the positive electrode column pad 410 (negative electrode column pad 420). It can be understood that the important component in the top cover module 10 to ensure its sealing is the positive electrode seal 610 (negative electrode seal 620). After the top cover module 10 is assembled, the top cover module 10 needs to be helium tested. However, if the positive electrode rivet 310 (negative electrode rivet 320) and the positive electrode column pad 410 (negative electrode column pad 420) achieve the sealing of the positive electrode column hole 101 (negative electrode column hole 102), then even if the positive electrode seal 610 (negative electrode seal 620) is not assembled, or the positive electrode seal 610 (negative electrode seal 620) has a sealing problem, the top cover module 10 can also pass the helium test. In this embodiment, the added first positive electrode exhaust channel (first negative electrode exhaust channel) makes the positive electrode rivet 310 (negative electrode rivet 320) and the positive electrode column pad 410 (negative electrode column pad 420) unable to play a sealing role, thereby realizing effective detection of the positive electrode seal 610 (negative electrode seal 620).

[0072] Further optional, refer to Figure 12-13 As shown, the positive electrode pad 410 (negative electrode pad 420) has a first positive electrode mounting groove 411 (first negative electrode mounting groove 421), the positive electrode rivet 310 (negative electrode rivet 320) has a connected positive electrode stop portion 311 (negative electrode stop portion 321) and a positive electrode convex ring portion 312 (negative electrode convex ring portion 322), the positive electrode stop portion 311 (negative electrode stop portion 321) is installed in the first positive electrode mounting groove 411 (first negative electrode mounting groove 421), and the positive electrode convex ring portion 312 (negative electrode convex ring portion 322) stops at the inner surface of the positive electrode pad 410 (negative electrode pad 420) provided with the first positive electrode mounting groove 411 (first negative electrode mounting groove 421); It is understood that during the actual installation process, the positive electrode stop portion 311 (negative electrode stop portion 321) is installed in the first positive electrode mounting groove 411 (first negative electrode mounting groove 421), and the positive electrode convex ring portion 312 (negative electrode convex ring portion 322) is stopped at the inner surface of the first positive electrode mounting groove 411 (first negative electrode mounting groove 421) provided on the positive electrode column pad 410 (negative electrode column pad 420), so that the positive electrode column pad 410 (negative electrode column pad 420) can stably support the positive electrode rivet 310 (negative electrode rivet 320) and isolate it from the top cover sheet 100, thereby ensuring the installation stability of the positive electrode column pad 410 (negative electrode column pad 420).

[0073] Further optional, refer to Figure 4-Figure 5 、 Figure 12-13As shown, the first positive electrode exhaust channel (first negative electrode exhaust channel) includes a first positive electrode sub-channel 3111 (first negative electrode sub-channel 3211) formed at the bottom of the positive electrode convex ring portion 312 (negative electrode convex ring portion 322) and a second positive electrode sub-channel 412 (second negative electrode sub-channel 422) formed on the side wall of the first positive electrode mounting groove 411 (first negative electrode mounting groove 421). As a result, the positive electrode post hole 101 (negative electrode post hole 102) can be connected to the outside world through the first positive electrode sub-channel 3111 (first negative electrode sub-channel 3211) and / or the second positive electrode sub-channel 412 (second negative electrode sub-channel 422), ensuring that the positive electrode rivet 310 (negative electrode rivet 320) and the positive electrode post gasket 410 (negative electrode post gasket 420) cannot perform a sealing function, thereby achieving effective detection of the positive electrode seal 610 (negative electrode seal 620). The depth of the first positive sub-channel 3111 (the first negative sub-channel 3211) is 0.2mm-1mm, and the width of the first positive exhaust channel is 0.5mm-5mm, preferably with a depth of 0.2mm and a width of 2mm; the depth of the second positive sub-channel 412 (the second negative sub-channel 422) is 0.2mm-1mm, and the width of the first positive exhaust channel is 0.5mm-5mm, preferably with a depth of 0.2mm and a width of 2mm.

[0074] Of course, it should be noted that the first positive exhaust channel (first negative exhaust channel) can also be formed in other ways. For example, in an alternative embodiment, the upper surface of the positive electrode pad 410 (negative electrode pad 420) is flat, and the positive electrode rivet 310 (negative electrode rivet 320) directly abuts against the positive electrode pad 410. The first positive exhaust channel (first negative exhaust channel) is formed on the abutment surfaces of the positive electrode pad 410 (negative electrode pad 420) and the positive electrode rivet 310 (negative electrode rivet 320). It can be formed only on the upper surface of the positive electrode pad 410 (negative electrode pad 420), only on the lower surface of the positive electrode rivet 310 (negative electrode rivet 320), or on both the upper surface of the positive electrode pad 410 (negative electrode pad 420) and the lower surface of the positive electrode rivet 310 (negative electrode rivet 320).

[0075] Optional, reference Figure 14As shown, a second positive electrode exhaust channel 540 (second negative electrode exhaust channel 550) connected to the positive electrode column hole 101 (negative electrode column hole 102) is formed between the insulating part 500 and the top cover sheet 100. The important component in the top cover module 10 to ensure its sealing is the positive electrode seal 610 (negative electrode seal 620). After the top cover module 10 is assembled, it is necessary to perform helium detection on the top cover module 10. However, if the insulating part 500 achieves the sealing of the positive electrode column hole 101 (negative electrode column hole 102), then even if the positive electrode seal 610 (negative electrode seal 620) is not assembled, or the positive electrode seal 610 (negative electrode seal 620) has a sealing problem, the top cover module 10 can also pass the helium detection. In this embodiment, the additional second exhaust channel makes it impossible for the insulating part 500 to play a sealing role, thereby achieving effective detection of the positive electrode seal 610. Further optionally, refer to Figure 14 As shown, a positive electrode through-hole 520 (negative electrode through-hole 530) is formed on the insulating portion, and the second positive electrode exhaust channel 540 (second negative electrode exhaust channel 550) is connected to the positive electrode through-hole 520 (negative electrode through-hole 530). Of course, it should be noted here that the second positive electrode exhaust channel 540 (second negative electrode exhaust channel 550) can also be formed in other ways. For example, the second positive electrode exhaust channel 540 (second negative electrode exhaust channel 550) is formed on the side wall of the top cover sheet 100 facing the insulating member 500 and is connected to the positive electrode column hole 101 (negative electrode column hole 102). For another example, the second positive electrode exhaust channel 540 (second negative electrode exhaust channel 550) is formed on both the top cover sheet 100 and the insulating member 500.

[0076] refer to Figure 6-Figure 7 As shown, the positive electrode pad 410 (negative electrode pad 420) includes a positive electrode insulating protrusion 413 (negative electrode insulating protrusion 423) that extends into the positive electrode hole 101 (negative electrode hole 102). The positive electrode insulating protrusion 413 (negative electrode insulating protrusion 423) is compressed between the outer wall of the positive electrode body 211 (negative electrode body 221) and the inner wall of the positive electrode hole 101 (negative electrode hole 102). It can be understood that the positive electrode insulating protrusion 413 (negative electrode insulating protrusion 423) can prevent the positive electrode hole 101 (negative electrode hole 102) on the top cover sheet 100 from overlapping with the positive electrode body 211 (negative electrode body 221) due to burrs left by the stamping process, thereby ensuring the insulation properties of the top cover sheet 100 and the positive electrode body 211 (negative electrode body 221).

[0077] Optionally, the negative electrode pad 420 is an insulating material, and the positive electrode pad 410 can be designed as an insulating material or a weakly conductive material. Specifically, when the positive electrode pad 410 and the negative electrode pad 420 are both made of insulating materials, it means that the positive electrode pad 410 and the negative electrode pad 420 can be interchanged, and there is no need to design a foolproof distinction between the two. When the negative electrode pad 420 is an insulating material and the positive electrode pad 410 is a weakly conductive material (the weakly conductive material can make the position of the positive electrode pad 410 have a higher electric potential and reduce the rate at which the positive rivet 310 is corroded), it is necessary to design a foolproof distinction between the two. The foolproof distinction design can design the positive electrode pad 410 and the negative electrode pad 420 to be different colors, or they can be distinguished by setting a foolproof part.

[0078] Further optional, refer to Figure 4 and Figure 5 As shown, the positive electrode foolproof part (negative electrode foolproof part) includes a positive electrode foolproof protrusion (negative electrode foolproof protrusion) and a positive electrode foolproof groove 1031 (negative electrode foolproof groove 1041) that cooperate with each other. In this embodiment, as shown in FIG. Figure 4 and- Figure 9 As shown, the top cover sheet 100 is provided with a second positive electrode mounting groove 103 (second negative electrode mounting groove 104) arranged around the positive electrode post hole 101 (negative electrode post hole 102). A positive electrode foolproofing groove 1031 (negative electrode foolproofing groove 1041) is provided on the bottom wall of the second positive electrode mounting groove 103 (second negative electrode mounting groove 104). A positive electrode foolproofing protrusion (negative electrode foolproofing protrusion) is provided on the bottom wall of the positive electrode post pad 410 and the negative electrode post pad 420. There are two positive electrode foolproofing grooves 1031 (negative electrode foolproofing grooves 1041), each located at two diagonal positions (the upper left corner and the lower right corner) of the second positive electrode mounting groove 103, and two negative electrode foolproofing grooves 1041 are located at two diagonal positions (the upper right corner and the lower left corner) of the second positive electrode mounting groove 103.

[0079] It should be noted that the positions of the positive anti-mistake protrusion (negative anti-mistake protrusion) and the positive anti-mistake groove 1031 (negative anti-mistake groove 1041) can be selected according to actual needs. For example, the positive anti-mistake groove 1031 (negative anti-mistake groove 1041) is arranged on the side wall of the second positive electrode mounting groove 103 (second negative electrode mounting groove 104), and the positive anti-mistake protrusion (negative anti-mistake protrusion) is arranged on the side wall of the positive electrode column pad 410 and the negative electrode column pad 420; for another example, the positive anti-mistake protrusion (negative anti-mistake protrusion) is arranged on the bottom wall of the second positive electrode mounting groove 103 (second negative electrode mounting groove 104), and the positive anti-mistake groove 1031 (negative anti-mistake groove 1041) is arranged on the bottom wall of the positive electrode column pad 410 and the negative electrode column pad 420.

[0080] It should be noted that, in addition to different locations of the positive and negative electrode foolproofing parts, different shapes and numbers of the positive and negative electrode foolproofing parts can also be designed to distinguish the positive electrode pad 410 from the negative electrode pad 420. Of course, multiple differences can also be set to better distinguish them, such as at least two of the locations, numbers, and shapes of the positive and negative electrode foolproofing parts being different, or all of them being different. Of course, in actual design, the positive and negative electrode foolproofing parts can also be designed in other convenient ways to distinguish them, thereby distinguishing the positive electrode pad 410 from the negative electrode pad 420.

[0081] To clearly distinguish the positive electrode post assembly 210 from the negative electrode post assembly 220 during assembly, the top cover module 10 is further provided with a foolproof structure. The foolproof structure is used to distinguish the polarity of the positive electrode post assembly 210 and the negative electrode post assembly 220 that fit into the post hole. The specific structure of the foolproof structure is described below.

[0082] As mentioned above, the structures of the positive electrode column body 211 and the negative electrode column body 221 are not the same, the positive electrode rivet 310 and the negative electrode rivet 320 have the same structure and are interchangeable, and the positive electrode column pad 410 and the negative electrode column pad 420 can be distinguished by the anti-fool feature mentioned above. Therefore, it is also necessary to set an anti-fool structure for the positive electrode welding part 212 and the negative electrode welding part 222. Specifically, an anti-fool structure needs to be designed between the positive electrode welding part 212 (negative electrode welding part 222) and the insulating part 500. The anti-fool structure includes a positive electrode anti-fool convex edge 560 (negative electrode anti-fool convex edge 570) provided on the insulating part 500, and a positive electrode anti-fool surface 2124 (negative electrode anti-fool surface 2224) is provided on the positive electrode anti-fool convex edge 560 (negative electrode anti-fool convex edge 570) on the positive electrode welding part 212 (negative electrode welding part 222) to stop on the positive electrode anti-fool convex edge 560 (negative electrode anti-fool convex edge 570). It should be noted that the shapes of the positive anti-mistake convex edge 560 and the negative anti-mistake convex edge 570 are different, and the shapes of the positive anti-mistake surface 2124 and the negative anti-mistake surface 2224 are also different, thereby achieving the distinction between the positive electrode welding part 212 and the negative electrode welding part 222.

[0083] Example 2:

[0084] The top cover module 10 of this embodiment has substantially the same structure as that of the top cover module 10 of the first embodiment, except that two insulating members 500 are provided, one for the positive electrode and one for the negative electrode, respectively. The positive and negative insulating members are mounted on the other side of the top cover sheet 100. A positive anti-mock ridge 560 is provided on the positive insulating member, and a negative anti-mock ridge 570 is provided on the negative insulating member.

[0085] Example 3:

[0086] The top cover module 10 of this embodiment has substantially the same structure as that of the top cover module 10 of the first embodiment, except that it has only one terminal hole, which serves as either a positive or negative terminal hole. The structure cooperating with the positive or negative terminal hole is identical to that of the first embodiment. The top cover module 10 of this embodiment is suitable for batteries having positive and negative terminal lead structures, respectively, at both ends.

[0087] Example 4:

[0088] refer to Figure 15 As shown, the battery of this embodiment includes a shell 30, two core packs 20 and the top cover module 10 in Example 1. The shell 30 has a mounting cavity with an open end. The two core packs 20 are bundled together and arranged in the shell 30. The top cover module 10 is snapped into the open end of the mounting cavity, and the positive electrode welding part 212 and the negative electrode welding part 222 of the top cover module 10 are respectively connected to the positive electrode ear 201 and the negative electrode ear 202 located at one end of the core pack 20.

[0089] Optionally, the battery further includes a top cover patch 40, which is provided with a positive electrode avoidance hole and a negative electrode avoidance hole corresponding to the positive electrode column assembly 210 and the negative electrode column assembly 220, respectively. The additional top cover patch 40 can completely block the top cover sheet 100 except for the positive electrode column assembly 210 and the negative electrode column assembly 220, thereby preventing the top cover sheet 100 from short-circuiting.

[0090] Optionally, the battery further includes an insulating film 50 and a bottom support sheet 60. The insulating film 50 is sleeved on the core pack 20, and the bottom support sheet 60 is installed inside the shell 30 and sandwiched between the core pack 20 and the bottom wall of the shell 30. This can effectively achieve the insulation function between the battery and the shell 30, preventing the shell 30 from being charged.

[0091] Optionally, a protective film 70 is further provided on the outer side of the shell 30, thereby enhancing the protection of the battery.

[0092] Optionally, the battery further includes a sealing nail 80 , which is used to seal the liquid injection hole 106 on the top cover sheet 100 . A sealing patch 90 is also provided on the sealing nail 80 , which can enhance the sealing effect and protect the sealing nail 80 .

[0093] Embodiment 5:

[0094] The battery of this embodiment includes a shell 30, a core pack 20 and the top cover module 10 of the third embodiment. The shell 30 has an installation cavity with both ends of the installation cavity open. The core pack 20 is arranged in the shell 30. The two top cover modules 10 are snapped into the two open ends of the installation cavity, and the welding parts of the two top cover modules 10 are respectively welded to the positive electrode ear 201 and the negative electrode ear 202 at both ends of the core pack 20.

[0095] It should be noted that if the shell 30 serves as the positive or negative electrode of the battery, one end of the installation cavity can also be opened and the other end can be closed. The closed end serves as the positive or negative electrode, and the open end is provided with the top cover module 10 of Example 3. The welding part of the top cover module 10 is welded to the positive electrode ear 201 (or negative electrode ear 202) of the core package 20.

[0096] Throughout this specification, references to "some embodiments," "other embodiments," and the like indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0097] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A top cover module, characterized in that: include: A top cover plate, wherein the top cover plate is provided with a pole hole; A pole assembly, the pole assembly comprising a pole body and a welding piece, the welding piece being welded to one end of the pole body, the pole body being passed through the pole hole, the welding piece being used to connect to the tab of the core package, and the welding piece having at least two welding areas with the same tab of the core package; a rivet, the rivet connected to the other end of the pole body, and the rivet and the welding piece are respectively located on both sides of the top cover; A pole pad, the pole pad being sandwiched between the riveted piece and the top cover sheet; An insulating member is sandwiched between the welding member and the top cover sheet so as to insulate the welding member from the top cover sheet.

2. The top cover module according to claim 1, characterized in that: The welding piece has a pole assembly hole provided therethrough, one end of the pole body is inserted into the pole assembly hole, and the pole body is connected to the assembly edge of the pole assembly hole by welding.

3. The top cover module according to claim 2, characterized in that: The welding piece is provided with a welding groove surrounding the pole assembly hole, and the pole body has a welding boss corresponding to the welding groove, and a weld is formed between the outer wall of the welding boss and the inner wall of the welding groove.

4. The top cover module according to any one of claims 1 to 3, characterized in that: At least two welding regions are located on both sides of a connection region between the pole body and the welding piece.

5. The top cover module according to any one of claims 1 to 3, characterized in that: The top cover module further includes a seal, which is sleeved on the pole body, with a portion of the seal being compressed between the outer peripheral wall of the pole body and the inner peripheral wall of the pole hole, and another portion being compressed between the pole body and / or the welding piece and the surface of the top cover facing the welding piece; Wherein: a first exhaust channel communicating with the pole hole is formed between the rivet and the pole pad, and / or a second exhaust channel communicating with the pole hole is formed between the insulating member and the top cover sheet.

6. The top cover module according to any one of claims 1 to 3, characterized in that: The pole pad has a first mounting groove, the rivet has a stop portion and a convex ring portion connected to each other, the stop portion is installed in the first mounting groove, and the convex ring portion abuts against the surface of the pole pad where the first mounting groove is provided; and / or: The pole pad has an insulating protruding ring extending into the pole hole, and the insulating protruding ring is pressed between the outer side wall of the pole body and the inner side wall of the pole hole.

7. The top cover module according to any one of claims 1 to 3, characterized in that: The top cover sheet is provided with a pole hole, the pole body, the rivet and the weld are one, and constitute the positive pole or negative pole of the battery; or: The top cover sheet is provided with two pole holes spaced apart from each other. The pole body, the riveted part and the welded part are each two in number and constitute the positive pole and the negative pole respectively.

8. The top cover module according to claim 7, characterized in that: The pole body of the negative pole includes a negative pole riveting portion and a negative pole welding portion, the negative pole riveting portion is connected to the riveted part and is made of the same material as the riveted part, and the negative pole welding portion is connected to the welding part and is made of the same material as the welding part; wherein: the insulating part has a support portion on the side away from the top cover sheet, and the negative pole welding part is provided with a support step corresponding to the support portion, and the support step and the support portion both stop at the welding part.

9. The top cover module according to any one of claims 1 to 3, characterized in that: The top cover sheet is provided with two pole holes spaced apart from each other, and there are two pole bodies, two rivets and two welded parts. The top cover module is also provided with an anti-foolproof structure for distinguishing the polarity of the pole body matched with the pole hole.

10. A battery, characterized in that: It comprises a shell, a core pack and a top cover module as described in any one of claims 1 to 9, wherein the shell has a mounting cavity, the mounting cavity has an open end, the core pack is arranged in the shell, the top cover module is snapped into the open end of the mounting cavity, and the welding part of the top cover module is connected to the pole ear of the core pack.

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