Battery cell and battery pack

Abstract

This utility model relates to the field of battery technology, specifically disclosing a battery cell including a top cover assembly. The top cover assembly includes a top cover sheet and a first terminal post. The top cover sheet has a first through hole. The first terminal post includes a first column, a first welding ring, and a first adhesive coating. The first column passes through the first welding ring, and the first welding ring is welded to the wall of the first through hole and connected to the top cover sheet. The first welding ring has a first annular groove. The first adhesive coating is annular and at least partially located within the first annular groove. The first adhesive coating is connected between the outer peripheral wall of the first column and the groove wall of the first annular groove. The first column is insulated from the first welding ring. This utility model also discloses a battery pack. This utility model modularizes the terminal post design. When dealing with batteries of different sizes or specifications, the terminal post does not need to be redesigned; it only needs to be welded to the pre-drilled hole on the top cover sheet via the welding ring, thereby greatly reducing the design process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and battery pack. Background Technology

[0002] Power batteries typically come in different sizes, and existing terminal assembly components are non-modular. If the size of the battery changes, both the top cover and the terminal need to be redesigned, resulting in numerous design and manufacturing processes and delaying the product development cycle. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to solve the problem of complicated design and process flow when the size and specifications of the battery are changed due to the non-modular design of the electrode assembly in the existing technology.

[0004] To solve the above-mentioned technical problems, this utility model provides a battery cell, comprising:

[0005] A top cover assembly, the top cover assembly including a top cover plate and a first pole post, the top cover plate being provided with a first through hole;

[0006] The first pole post includes a first column, a first welding ring, and a first adhesive coating. The first column passes through the first welding ring. The first welding ring is welded to the wall of the first through hole and connected to the top cover plate. The first welding ring is provided with a first annular groove. The first adhesive coating is arranged in a ring shape and is at least partially located in the first annular groove. The first adhesive coating is connected between the outer peripheral wall of the first column and the groove wall of the first annular groove, so that the first column is insulated from the first welding ring.

[0007] More preferably, the battery cell has a first direction, the first welding ring includes a first bottom, a first extension and a first top, the first bottom is welded to the wall of the first through hole, the first extension is connected to the first bottom and extends along the first direction, the first top is connected to the first extension, and in the first direction, the first top and the first bottom are spaced apart, so that the first top, the first extension and the first bottom form the first annular groove.

[0008] More preferably, the first pole post further includes:

[0009] A first sealing ring, which is annular and elastic, is connected between the first column and the first bottom; in the first direction, the thickness of the first bottom is greater than the thickness of the first top.

[0010] More preferably, the first bottom has a third through hole, and the first column passes through the third through hole;

[0011] The first sealing ring includes a second extension and a third extension connected together. The second extension is located between the outer peripheral wall of the first column and the wall of the third through hole. The third extension is located on the side of the first bottom near the first top in the first direction, and the third extension is located between the first column and the first bottom.

[0012] More preferably, the first pole post further includes:

[0013] A first top plastic is arranged in a ring shape and connected to a first welding ring. The first top plastic includes a second top, a fourth extension and a fifth extension. The second top connects the fourth extension and the fifth extension, and the fourth extension and the fifth extension both extend toward the side closer to the first bottom in the first direction. The second top, the fourth extension and the fifth extension form a second annular groove, and the opening of the second annular groove faces the first bottom in the first direction.

[0014] At least a portion of the first top is located within the second annular groove, the fourth extension is located between the outer peripheral wall of the first column and the first top, and at least a portion of the fifth extension is located on the outer peripheral side of the first extension.

[0015] More preferably, the fifth extension is provided with a protrusion, which is arranged in a ring shape and located on the outer peripheral wall of the fifth extension.

[0016] More preferably, one of the wall of the first through hole and the first bottom is provided with a limiting flange, and the other is provided with a limiting groove, wherein the limiting groove matches the limiting flange.

[0017] More preferably, the top cover plate is further provided with a second through hole, and the top cover assembly further includes a second pole post;

[0018] The second pole post includes a second column, a second welding ring, and a second adhesive coating. The second column has the opposite polarity to the first column. The second column passes through the second welding ring. The second welding ring is welded to the wall of the second through hole and connected to the top cover plate. The second welding ring has a third annular groove. The second adhesive coating is arranged in a ring shape and is at least partially located in the third annular groove. The second adhesive coating is connected between the outer peripheral wall of the second column and the groove wall of the third annular groove, so that the second column is insulated from the second welding ring.

[0019] More preferably, the battery cell further includes:

[0020] A housing having a receiving cavity, wherein a top cover is connected to the housing and seals the receiving cavity;

[0021] The top cover assembly also includes a lower plastic sheet, which is connected to the top cover sheet.

[0022] An electrode assembly is disposed in the receiving cavity, and the lower plastic is located on the side of the top cover sheet facing the electrode assembly;

[0023] The electrode assembly includes a battery cell body, a first electrode tab, and a second electrode tab. Both the first electrode tab and the second electrode tab are electrically connected to the battery cell body. The first electrode tab passes through the lower plastic and is electrically connected to the first column. The second electrode tab passes through the lower plastic and is electrically connected to the second column.

[0024] This utility model also provides a battery pack, including the battery cells described above.

[0025] Compared with the prior art, the battery cell and battery pack provided by this utility model have the following advantages:

[0026] The first electrode post of this utility model includes a first post body, a first welding ring, and a first adhesive coating. The first welding ring has a first annular groove. The first adhesive coating connects the outer peripheral wall of the first post body and the groove wall of the first annular groove, allowing the first post body, the first welding ring, and the first adhesive coating to be assembled into a whole. This achieves a modular design of the electrode post. When dealing with batteries of different sizes or specifications, the electrode post does not need to be redesigned. Only the first through hole of the top cover plate needs to be designed to match the first welding ring. By welding the first welding ring to the first through hole, the assembly of the first electrode post and the top cover plate can be completed, which meets the requirements for rapid assembly of top cover plates of different sizes, thereby greatly reducing the design process. In addition, the annular arrangement of the first adhesive coating can insulate the first post body from the first welding ring, avoiding short circuits caused by the first post body being conductive to the top cover plate. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the battery cell described in this utility model.

[0028] Figure 2 This is an exploded view of the battery cell described in this utility model.

[0029] Figure 3 This is a schematic diagram of the top cover assembly described in Embodiment 1 of this utility model.

[0030] Figure 4 This is an exploded view of the top cover assembly described in Embodiment 1 of this utility model.

[0031] Figure 5This is a structural diagram of the first pole post in Embodiment 1 of this utility model.

[0032] Figure 6 This is an exploded view of the first pole post in Embodiment 1 of this utility model.

[0033] Figure 7 This is a partial cross-sectional view of the top cover assembly described in Embodiment 1 of this utility model.

[0034] Figure 8 This is a schematic diagram of the top cover assembly described in Embodiment 2 of this utility model.

[0035] Figure 9 This is an exploded view of the top cover assembly described in Embodiment 2 of this utility model.

[0036] Figure 10 This is a schematic diagram of the structure of the first pole post in Embodiment 2 of this utility model.

[0037] Figure 11 This is an exploded view of the first pole post in Embodiment 2 of this utility model.

[0038] Figure 12 This is a schematic diagram of the top cover sheet described in Embodiment 2 of this utility model.

[0039] Figure 13 This is a partial cross-sectional view of the top cover assembly described in Embodiment 2 of this utility model.

[0040] Figure 14 This is a schematic diagram of the structure of the second pole of this utility model.

[0041] Figure 15 This is a schematic diagram of the top cover assembly described in Embodiment 3 of this utility model.

[0042] Figure 16 This is an exploded view of the top cover assembly described in Embodiment 3 of this utility model.

[0043] Figure label:

[0044] 100. Shell; 110. Receiving cavity;

[0045] 200. Electrode assembly; 210. Battery cell body; 220. First electrode tab; 230. Second electrode tab;

[0046] 300. Top cover assembly; 310. Top cover piece; 311. First through hole; 312. Limiting groove; 313. Second through hole; 320. First pole post; 321. First pillar; 322. First welding ring; 3221. First annular groove; 3222. First bottom; 3222a. Third through hole; 3223. First extension; 3224. First top; 3225. Limiting flange; 323. First rubber coating; 324. First sealing ring; 324 1. Second extension; 3242. Third extension; 325. First upper plastic; 3251. Second annular groove; 3252. Second top; 3253. Fourth extension; 3254. Fifth extension; 3254a. Protrusion; 330. Second pole post; 331. Second pillar; 332. Second welding ring; 3321. Third annular groove; 333. First encapsulation; 334. Second sealing ring; 335. Second upper plastic; 340. Lower plastic;

[0047] 400. Insulating film. Detailed Implementation

[0048] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0049] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] Example 1

[0055] like Figures 1-7 As shown, this utility model provides a battery cell, including a top cover assembly 300. The top cover assembly 300 includes a top cover sheet 310, a first terminal post 320, and a second terminal post 330. The top cover sheet 310 is provided with a first through hole 311 and a second through hole 313. The first terminal post 320 is welded to the wall of the first through hole 311, and the second terminal post 330 is welded to the wall of the second through hole 313, thereby forming a whole with the first terminal post 320, the second terminal post 330, and the top cover sheet 310.

[0056] In a specific embodiment, the first pole post 320 includes a first post body 321, a first welding ring 322, and a first adhesive coating 323. The first post body 321 passes through the first welding ring 322. The first welding ring 322 is welded to the wall of the first through hole 311 and connected to the top cover plate 310. The first welding ring 322 is provided with a first annular groove 3221. The first adhesive coating 323 is at least partially located in the first annular groove 3221 and is connected between the outer peripheral wall of the first post body 321 and the groove wall of the first annular groove 3221, so that the first post body 321 is insulated from the first welding ring 322. In this way, by using the first adhesive 323 to connect the outer peripheral wall of the first column 321 and the groove wall of the first annular groove 3221, the first column 321, the first welding ring 322 and the first adhesive 323 can be assembled into a whole, realizing the modular design of the first pole post 320. When facing batteries of different sizes or specifications, the first pole post 320 does not need to be redesigned. It is welded to the wall of the first through hole 311 reserved on the top cover plate 310 by the first welding ring 322. When facing batteries of different sizes or specifications, only the design of the top cover plate 310 needs to be considered, which meets the requirements for rapid assembly of top cover plates 310 of different sizes, thereby greatly reducing the design process.

[0057] In some embodiments, the first adhesive coating 323 is arranged in a ring shape, which can insulate the first column 321 from the first welding ring 322, thereby preventing the first column 321 from being connected to the top cover plate 310 and causing a short circuit.

[0058] In some embodiments, the battery cell has a first direction Z, and the first welding ring 322 includes a first bottom 3222, a first extension 3223 and a first top 3224. The first bottom 3222 is welded to the wall of the first through hole 311. The first extension 3223 is connected to the first bottom 3222 and extends along the first direction Z. The first top 3224 is connected to the first extension 3223. In the first direction Z, the first top 3224 and the first bottom 3222 are spaced apart, so that the first top 3224, the first extension 3223 and the first bottom 3222 form a first annular groove 3221.

[0059] The cross-section of the first adhesive 323 can be U-shaped and fits into the groove wall of the first annular groove 3221 to ensure the insulation performance between the first column 321 and the first welding ring 322.

[0060] In some embodiments, to ensure the sealing and insulation performance between the first post 321 and the first bottom 3222, the first pole post 320 further includes a first sealing ring 324. The first sealing ring 324 is annular and elastic. The first sealing ring 324 is connected between the first post 321 and the first bottom 3222, so that the first post 321 is insulated from the first bottom 3222.

[0061] In some embodiments, since the first sealing ring 324 has an elastic force, it will compress the first bottom 3222 after assembly, causing deformation and reducing sealing and insulation performance. Therefore, in the first direction Z, the thickness of the first bottom 3222 is defined to be greater than the thickness of the first top 3224.

[0062] In some embodiments, in order to enable the first pillar 321 to be electrically connected to the first tab 220, the first bottom 3222 has a third through hole 3222a, through which the first pillar 321 passes. To further improve the sealing and insulation performance between the first column 321 and the first bottom 3222, the first sealing ring 324 includes a second extension 3241 and a third extension 3242 connected together. The second extension 3241 is located between the outer peripheral wall of the first column 321 and the wall of the third through hole 3222a to achieve sealing and insulation performance between the outer peripheral wall of the first column 321 and the wall of the third through hole 3222a. The third extension 3242 is located on the side of the first bottom 3222 close to the first top 3224 in the first direction Z, and the third extension 3242 is located between the first column 321 and the first bottom 3222 to achieve sealing and insulation performance between the first bottom 3222 and the first column 321. It can be seen that the two-section design of the first sealing ring 324 can ensure the sealing and insulation performance between the first column 321 and the first bottom 3222.

[0063] In some embodiments, to ensure the sealing and insulation between the first post 321 and the first top 3224, the first pole post 320 further includes a first upper plastic 325. The first upper plastic 325 is annularly arranged and connected to the first welding ring 322. The first upper plastic 325 includes a second top 3252, a fourth extension 3253, and a fifth extension 3254. The second top 3252 connects the fourth extension 3253 and the fifth extension 3254, and the fourth extension 3253 and the fifth extension 3254 are in the first position. The first top 3252, the fourth extension 3253, and the fifth extension 3254 extend towards the side closer to the first bottom 3222 in the Z direction. The second top 3252, the fourth extension 3253, and the fifth extension 3254 form a second annular groove 3251. The opening of the second annular groove 3251 faces the first bottom 3222 in the first direction Z. At least a portion of the first top 3224 is located in the second annular groove 3251. The fourth extension 3253 is located between the outer peripheral wall of the first column 321 and the first top 3224. At least a portion of the fifth extension 3254 is located on the outer peripheral side of the first extension 3223. Therefore, the first upper plastic 325 is designed as a three-section structure. The second annular groove 3251 formed by the second top 3252, the fourth extension 3253 and the fifth extension 3254 can ensure a more solid connection between the first upper plastic 325 and the first welding ring 322. The fourth extension 3253 is located between the outer peripheral wall of the first column 321 and the first top 3224, which can ensure the sealing and insulation performance between the first column 321 and the first top 3224. The fifth extension 3254 can increase the creepage distance between the top cover plate 310 and the first column 321, and avoid short circuit caused by the first column 321 and the top cover plate 310 conducting.

[0064] In some embodiments, to further increase the creepage distance between the top cover plate 310 and the first pillar 321, the fifth extension 3254 is provided with a protrusion 3254a. The protrusion 3254a is arranged in a ring shape and is located on the outer peripheral wall of the fifth extension 3254. In this way, the protrusion 3254a surrounds the outer wall of the first upper plastic 325, which can further increase the creepage distance between the top cover plate 310 and the first pillar 321, and prevent the first pillar 321 and the top cover plate 310 from conducting and causing a short circuit.

[0065] In some embodiments, the structure of the second pole post 330 is the same as that of the first pole post 320, except that the polarity of the second pole post 331 is opposite to that of the first pole post 321. Specifically, as shown... Figure 14As shown, the second pole post 330 includes a second pole body 331, a second welding ring 332, and a second adhesive coating 333. The second pole body 331 passes through the second welding ring 332. The second welding ring 332 is welded to the wall of the second through hole 313 and connected to the top cover plate 310. The second welding ring 332 is provided with a third annular groove 3321. The second adhesive coating 333 is arranged in an annular shape and is at least partially located in the third annular groove 3321. The second adhesive coating 333 is connected between the outer peripheral wall of the second pole body 331 and the groove wall of the third annular groove 3321, so that the second pole body 331 is insulated from the second welding ring 332. In this way, by using the second adhesive 333 to connect the outer peripheral wall of the second column 331 and the groove wall of the third annular groove 3321, the second column 331, the second welding ring 332 and the second adhesive 333 can be assembled into a whole, realizing the modular design of the second pole post 330. When facing batteries of different sizes or specifications, the second pole post 330 does not need to be redesigned. It is welded to the wall of the first through hole 311 reserved on the top cover plate 310 by the first welding ring 322. When facing batteries of different sizes or specifications, only the design of the top cover plate 310 needs to be considered, which meets the requirements for rapid assembly of top cover plates 310 of different sizes, thereby greatly reducing the design process.

[0066] In some embodiments, the second pole post 330 further includes a second sealing ring 334, wherein the second sealing ring 334 is arranged in an annular shape and is connected between the second post 331 and the groove wall of the third annular groove 3321. Its purpose is to ensure the sealing and insulation performance between the second post 331 and the second welding ring 332. The specific structure of the second sealing ring 334 can refer to the structure of the first sealing ring 324, and will not be described again.

[0067] In some embodiments, the second pole post 330 further includes a second upper plastic 335, which is arranged in a ring and connected to the second welding ring 332. The purpose of the second upper plastic 335 is to ensure the sealing and insulation performance between the second pole post 331 and the second welding ring 332, and to prevent the second pole post 331 from conducting with the top cover plate 310 and causing a short circuit. The structure of the second upper plastic 335 can refer to the structure of the first upper plastic 325, and will not be described in detail here.

[0068] In some embodiments, the second upper plastic 335 is a conductive plastic, which connects the second pillar 331 to the top cover plate 310. At this time, the second pillar 331 and the top cover plate 310 have the same electrical properties, such as carrying the same positive or negative charge.

[0069] In other embodiments, the second pillar 331 can also be designed as an integral structure with the top cover plate 310. When dealing with batteries of different sizes or specifications, the design requirements of the top cover plate 310 can be considered according to the position of the second pillar 331, and then the welding assembly of the first pole post 320 and the top cover plate 310 can be achieved, thereby further reducing the design process.

[0070] In some embodiments, the battery cell further includes a housing 100 and an electrode assembly 200. The housing 100 has a receiving cavity 110, and a top cover 310 is connected to the housing 100 and covers the receiving cavity 110. The electrode assembly 200 is disposed in the receiving cavity 110. The electrode assembly 200 includes a cell body 210, a first tab 220 and a second tab 230. Both the first tab 220 and the second tab 230 are electrically connected to the cell body 210. The first tab 220 is electrically connected to a first post 321, and the second tab 230 is electrically connected to a second post 331.

[0071] In some embodiments, to prevent a short circuit caused by the end face of the battery cell body 210 facing the top cover plate 310 being conductive with the top cover plate 310, the top cover assembly 300 further includes a lower plastic 340. The lower plastic 340 is connected to the top cover plate 310 and is located on the side of the top cover plate 310 facing the electrode assembly 200. A first tab 220 passes through the lower plastic 340 and is electrically connected to a first post 321. A second tab 230 passes through the lower plastic 340 and is electrically connected to a second post 331, thereby avoiding a short circuit caused by the battery cell body 210 being conductive with the top cover plate 310.

[0072] Example 2

[0073] like Figures 8-13 As shown, this embodiment 2 includes all the technical features of embodiment 1, the difference being:

[0074] In this embodiment, one of the hole wall of the first through hole 311 and the first bottom 3222 is provided with a limiting flange 3225, and the other is provided with a limiting groove 312. The limiting groove 312 matches the limiting flange 3225, so as to achieve step matching between the first bottom 3222 and the top cover plate 310, thereby improving the welding effect between the first bottom 3222 and the top cover plate 310.

[0075] In other embodiments, the second through hole 313 is configured in the same way as the first through hole 311.

[0076] Example 3

[0077] like Figure 15 and Figure 16As shown, this embodiment 3 includes all the technical features of embodiment 1, and therefore possesses at least all the beneficial effects brought about by the technical solution of embodiment 1, which will not be repeated here. The difference between this embodiment 3 and embodiment 1 is that:

[0078] The dimensions of the top cover plate 310 in this embodiment 3 are different from those in embodiment 1. Based on this, the first terminal 320 and the second terminal 330 do not need to be redesigned. The first terminal 320 can be welded to the first through hole 311 pre-drilled on the top cover plate 310 via the first welding ring 322. Similarly, the second terminal 330 can be welded to the second through hole 313 pre-drilled on the top cover plate 310 via the second welding ring 332. Therefore, when dealing with batteries of different sizes or specifications, only the design of the top cover plate 310 needs to be considered to meet the requirements for rapid assembly of top cover plates of different sizes, thereby greatly reducing the design process flow.

[0079] Example 4

[0080] This embodiment provides a battery pack, including a battery cell. The specific structure of the battery cell is as described in the above embodiments. Since the battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0081] In other embodiments, the present invention also proposes an electrical device, which includes a battery pack. The specific structure of the battery pack is as described in the above embodiments. Since the present electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0083] In summary, this utility model, by providing an annular groove in the welding ring and using an adhesive coating to connect the outer peripheral wall of the column and the groove wall, allows the column, welding ring, and adhesive coating to be assembled into a whole, achieving a modular design of the terminal post. When dealing with batteries of different sizes or specifications, the terminal post does not need to be redesigned; it is welded to the pre-drilled through-hole on the top cover plate. When dealing with batteries of different sizes or specifications, only the design of the top cover plate needs to be considered, satisfying the rapid assembly of top cover plates of different sizes, thereby greatly reducing the design process. In addition, the annular arrangement of the adhesive coating can insulate the column from the welding ring, preventing short circuits caused by electrical conductivity between the column and the top cover plate.

[0084] The above description is merely a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model. The basic principles, main features, and advantages of this utility model have been shown and described above. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery cell, characterized in that, include: Top cover assembly (300), the top cover assembly (300) includes a top cover plate (310) and a first pole post (320), the top cover plate (310) is provided with a first through hole (311); The first pole post (320) includes a first post (321), a first welding ring (322), and a first coating (323). The first post (321) passes through the first welding ring (322). The first welding ring (322) is welded to the wall of the first through hole (311) and connected to the top cover plate (310). The first welding ring (322) is provided with a first annular groove (3221). The first coating (323) is arranged in an annular shape and is at least partially located in the first annular groove (3221). The first coating (323) is connected between the outer peripheral wall of the first post (321) and the groove wall of the first annular groove (3221), so that the first post (321) is insulated from the first welding ring (322).

2. The battery cell according to claim 1, characterized in that, The battery cell has a first direction (Z). The first welding ring (322) includes a first bottom (3222), a first extension (3223), and a first top (3224). The first bottom (3222) is welded to the wall of the first through hole (311). The first extension (3223) is connected to the first bottom (3222) and extends along the first direction (Z). The first top (3224) is connected to the first extension (3223). In the first direction (Z), the first top (3224) and the first bottom (3222) are spaced apart, so that the first top (3224), the first extension (3223), and the first bottom (3222) form the first annular groove (3221).

3. The battery cell according to claim 2, characterized in that, The first pole piece (320) further includes: The first sealing ring (324) is annular and elastic, and is connected between the first column (321) and the first bottom (3222); in the first direction (Z), the thickness of the first bottom (3222) is greater than the thickness of the first top (3224).

4. The battery cell according to claim 3, characterized in that, The first bottom (3222) has a third through hole (3222a), and the first column (321) passes through the third through hole (3222a). The first sealing ring (324) includes a connected second extension (3241) and a third extension (3242), the second extension (3241) being located between the outer peripheral wall of the first column (321) and the wall of the third through hole (3222a), the third extension (3242) being located on the side of the first bottom (3222) in the first direction (Z) near the first top (3224), and the third extension (3242) being located between the first column (321) and the first bottom (3222).

5. The battery cell according to claim 2, characterized in that, The first pole piece (320) further includes: A first upper plastic (325) is arranged in a ring shape and connected to a first welding ring (322). The first upper plastic (325) includes a second top (3252), a fourth extension (3253) and a fifth extension (3254). The second top (3252) connects the fourth extension (3253) and the fifth extension (3254). The fourth extension (3253) and the fifth extension (3254) both extend towards the side closer to the first bottom (3222) in the first direction (Z). The second top (3252), the fourth extension (3253) and the fifth extension (3254) form a second annular groove (3251). The opening of the second annular groove (3251) faces the first bottom (3222) in the first direction (Z). At least a portion of the first top (3224) is located within the second annular groove (3251), the fourth extension (3253) is located between the outer peripheral wall of the first column (321) and the first top (3224), and at least a portion of the fifth extension (3254) is located on the outer peripheral side of the first extension (3223).

6. The battery cell according to claim 5, characterized in that, The fifth extension (3254) is provided with a protrusion (3254a), which is arranged in a ring shape and located on the outer peripheral wall of the fifth extension (3254).

7. The battery cell according to any one of claims 2-6, characterized in that, The first through hole (311) has a limiting flange (3225) on one of its hole wall and the first bottom (3222), and the other has a limiting groove (312) that matches the limiting flange (3225).

8. The battery cell according to any one of claims 1-6, characterized in that, The top cover plate (310) is also provided with a second through hole (313), and the top cover assembly (300) also includes a second pole post (330). The second pole post (330) includes a second post (331), a second welding ring (332), and a second coating (333). The second post (331) has the opposite polarity to the first post (321). The second post (331) passes through the second welding ring (332). The second welding ring (332) is welded to the wall of the second through hole (313) and connected to the top cover plate (310). The second welding ring (332) is provided with a third annular groove (3321). The second coating (333) is arranged in a ring shape and is at least partially located in the third annular groove (3321). The second coating (333) is connected between the outer peripheral wall of the second post (331) and the groove wall of the third annular groove (3321), so that the second post (331) is insulated from the second welding ring (332).

9. The battery cell according to claim 8, characterized in that, The battery cell also includes: A housing (100) having a receiving cavity (110), and a top cover (310) connected to the housing (100) and covering the receiving cavity (110). The top cover assembly (300) also includes a lower plastic (340) connected to the top cover sheet (310); An electrode assembly (200) is disposed in the receiving cavity (110), and the lower plastic (340) is located on the side of the top cover sheet (310) facing the electrode assembly (200); The electrode assembly (200) includes a battery cell body (210), a first tab (220), and a second tab (230). Both the first tab (220) and the second tab (230) are electrically connected to the battery cell body (210). The first tab (220) passes through the lower plastic (340) and is electrically connected to the first column (321). The second tab (230) passes through the lower plastic (340) and is electrically connected to the second column (331).

10. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1-9 above.

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