Single cell and battery pack

Abstract

The application discloses a single battery and a battery pack. The single battery comprises a shell, a top cover, an electrode assembly, a first insulating piece, a first pole and a first sealing piece. The top cover is connected with the shell, and the top cover is provided with a pole hole. The electrode assembly is located in the shell, and the electrode assembly comprises an electrode main body and a first tab and a second tab connected with two ends of the electrode main body along a first direction. The first insulating piece is connected with a side of the top cover away from the electrode assembly. The first pole is provided in the first insulating piece and the pole hole along a second direction, and the first pole is electrically connected with the first tab. The first sealing piece is arranged around the first pole, and a part of the first sealing piece is located in the pole hole. A first abutting portion of the first insulating piece is protruded along the second direction, and the first abutting portion abuts against the first sealing piece. The single battery provided by the application is characterized in that the first abutting portion abuts against the first sealing piece, the gap between the first abutting portion and the first sealing piece is reduced, and the sealing property between the first sealing piece and the first insulating piece is improved.

Description

Technical Field

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

[0002] A single battery cell is the power source that powers new energy vehicles. As a new energy product, single batteries are becoming increasingly widely used.

[0003] Therefore, existing single-cell batteries with tabs on the side have a problem with poor sealing performance. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single-cell battery that aims to solve the technical problem of poor sealing performance of single-cell batteries in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a single-cell battery having a first direction and a second direction perpendicular to each other, including: case; A top cover, connected to the housing, wherein the top cover is provided with a pole hole extending through along the second direction; An electrode assembly is located within the housing. The electrode assembly includes an electrode body and a first electrode tab and a second electrode tab connected to both ends of the electrode body along the first direction. A first insulating element is connected to the side of the top cover opposite to the electrode assembly; The first electrode post is disposed along the second direction through the first insulating member and the electrode post hole, and the first electrode post is electrically connected to the first electrode tab. A first sealing element is disposed around the first electrode post, a portion of the first sealing element is located within the electrode post hole, and the first insulating element includes a first abutting portion that protrudes in a direction close to the electrode assembly along the second direction and abuts against the first sealing element.

[0006] The single-cell battery provided in this application has a first insulating member connected to the top cover on the side away from the electrode assembly, a first sealing member surrounding the first electrode post, a portion of the first sealing member located inside the electrode post hole, and a first abutting portion of the first insulating member protruding along a second direction to achieve abutting between the first abutting portion and the first sealing member, thereby reducing the gap between the first sealing member and the first insulating member, improving the sealing performance between the first sealing member and the first insulating member, and thus improving the sealing effect of the single-cell battery.

[0007] In one embodiment of the first aspect, the top cover is provided with a groove on the side facing the first insulating member, the groove is recessed along the second direction toward the electrode assembly, the groove wall is disposed around the first electrode post, and the groove communicates with the electrode post hole, and a portion of the first abutment portion is located in the groove.

[0008] In one embodiment of the first aspect, the first seal includes a first sealing portion and a second sealing portion connected together, the first sealing portion being located within the pole post hole, the first abutting portion abutting against the first sealing portion, and the second sealing portion abutting against the top cover and a portion of the first pole post.

[0009] In one embodiment of the first aspect, a portion of the hole wall of the electrode post hole is a first inclined surface, the first inclined surface is disposed along the electrode post hole toward one end near the electrode assembly, the first seal further includes a third sealing portion connected to the first sealing portion and the second sealing portion, the third sealing portion is located between the first sealing portion and the second sealing portion, the third sealing portion is provided with a second inclined surface, the second inclined surface abuts against the first inclined surface.

[0010] In one embodiment of the first aspect, the second inclined surface is disposed circumferentially along the third sealing portion, and the distance between two second inclined surfaces disposed opposite each other along the first direction gradually increases along the second direction from the first sealing portion to the second sealing portion.

[0011] In one embodiment of the first aspect, the first electrode post includes a first column segment, a second column segment, and a third column segment connected sequentially in the second direction, a portion of the first column segment passing through the electrode post hole and the first insulating member, and the side of the third column segment opposite to the first column segment being electrically connected to the electrode assembly. The first sealing part is located inside the electrode post hole, and the second sealing part abuts against the side of the second column segment opposite to the electrode assembly.

[0012] In one embodiment of the first aspect, the end of the first abutting portion near the first sealing portion is an arc surface, and the arc surface abuts against the first sealing portion.

[0013] In one embodiment of the first aspect, the first sealing portion is provided with an abutment groove, the abutment groove being recessed in the direction of the second direction toward the electrode assembly, and a portion of the first abutment portion is located within the abutment groove.

[0014] In one embodiment of the first aspect, the single-cell battery further includes: The second insulating member is connected to the side of the top cover opposite to the electrode assembly, and the second insulating member and the first insulating member are spaced apart along the first direction; The second pole is spaced apart from the first pole along the first direction, and the second pole is electrically connected to the second pole ear; A second seal is disposed around the second electrode post, a portion of which is located within the electrode post bore. The second insulating member includes a second abutment portion that protrudes in the direction of the second direction toward the electrode assembly and abuts against the second seal.

[0015] Secondly, embodiments of this application also provide a battery pack, including the single battery cells described in any of the above embodiments.

[0016] The second aspect of this application provides a battery pack having individual cells as described in any of the above embodiments, and therefore possesses all the beneficial effects of the individual cells provided in the embodiments of the first aspect, which will not be elaborated here. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This paper shows a schematic diagram of a single cell structure from one perspective in one embodiment of the present application; Figure 2 It shows Figure 1 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 3 It shows Figure 2 Enlarged structural diagram of section B in the middle; Figure 4 A schematic diagram of the structure of the first pole post in one embodiment of this application is shown; Figure 5 A schematic diagram of the structure of the first seal in one embodiment of this application is shown; Figure 6 It shows Figure 5 Schematic diagram of the cross-sectional structure along the CC direction; Figure 7 A schematic diagram of the structure of the first insulating element in one embodiment of this application is shown; Figure 8 A schematic diagram of the exploded structure of a single cell in one embodiment of this application is shown. Figure 1 ; Figure 9 A schematic diagram of the exploded structure of a single cell in one embodiment of this application is shown. Figure 2 .

[0019] Explanation of key component symbols: 100 - Single cell; 110 - Casing; 120 - Electrode assembly; 121 - Electrode body; 122 - First tab; 123 - Second tab; 130 - Top cover; 131 - Terminal hole; 132 - First bevel; 133 - Groove; 140a - First terminal; 140b - Second terminal; 141 - First segment; 142 - Second segment; 143 - Third segment; 150 - First insulating component; 151 - Second insulating component; 160a - First sealing component; 160b - Second sealing component; 161 - First sealing part; 1611 - Abutment groove; 162 - Second sealing part; 163 - Third sealing part; 1631 - Second bevel; 170 - First abutment part; 1701 - Arc surface; 171 - Second abutment part; X - First direction; Z - Second direction. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly 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.

[0025] Individual cells are a crucial component of battery packs. For cells with tabs, the top cover typically houses an upper plastic component, terminals, and a seal. The seal's elasticity seals the gap between the terminals and the top cover. However, the inventors discovered that a gap exists between the upper plastic component and the seal, resulting in poor sealing performance in individual cells.

[0026] To solve the above technical problems, such as Figure 1 and Figure 2 As shown, an embodiment of this application provides a single-cell battery 100, mainly used in a battery pack. It can be indirectly applied to electrical devices or energy storage devices via a battery pack. Of course, the single-cell battery can also be directly applied to electrical devices or energy storage devices without using a battery pack; therefore, no specific limitations are placed on the application scenarios of the single-cell battery.

[0027] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be 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; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0028] The single cell 100 has a first direction X and a second direction Z that are perpendicular to each other. For the sake of convenience in the following description of the embodiments, the first direction X is the length direction and the second direction Z is the height direction.

[0029] like Figures 1 to 3 As shown, the single cell 100 includes a housing 110, a top cover 130, an electrode assembly 120, a first insulating member 150, a first terminal post 140a, and a first sealing member 160a.

[0030] The top cover 130 is connected to the housing 110, and the top cover 130 is provided with a pole hole 131 that runs through along the second direction Z (i.e., the height direction).

[0031] Combination Figure 9 As shown, the electrode assembly 120 is located within the housing 110. The electrode assembly 120 includes an electrode body 121 and a first tab 122 and a second tab 123 connected to both ends of the electrode body 121 along a first direction X. A first insulating member 150 is connected to the side of the top cover 130 opposite to the electrode assembly 120. A first electrode post 140a passes through the first insulating member 150 and the electrode post hole 131 along a second direction Z. The first electrode post 140a is electrically connected to the first tab 122 to achieve electrical connection between the first electrode post 140a and the electrode assembly 120.

[0032] The first sealing member 160a is disposed around the first electrode post 140a, and a portion of the first sealing member 160a is located inside the electrode post hole 131. The first insulating member 150 includes a first abutting portion 170, which protrudes along the second direction Z toward the electrode assembly 120 and abuts against the first sealing member 160a. The second sealing portion 162 abuts against the top cover 130 and a portion of the first electrode post 140a.

[0033] The single-cell battery 100 provided in the embodiments of this application has a first insulating member 150 connected to the side of the top cover 130 away from the electrode assembly 120. The first insulating member 150 can be glued to the top cover 130, pressed, etc. A first sealing member 160a is disposed around the first terminal post 140a, and a part of the first sealing member 160a is located in the terminal post hole 131. The first abutting portion 170 of the first insulating member 150 is provided to protrude along the second direction Z, so as to achieve abutment between the first abutting portion 170 and the portion of the first sealing member 160a located in the terminal post hole 131. In this way, the gap between the first sealing member 160a and the first insulating member 150 is reduced, and the sealing performance between the first sealing member 160a and the first insulating member 150 is improved, thereby improving the airtightness of the single-cell battery 100.

[0034] For example, the material of the top cover 130 and / or the shell 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0035] like Figure 3 As shown, in some embodiments, the top cover 130 is provided with a groove 133 on the side facing the first insulating member 150. The groove 133 is recessed along the second direction Z towards the electrode assembly 120. The groove wall of the groove 133 is provided around the first pole post 140a, and the groove 133 communicates with the pole post hole 131. A portion of the first abutment portion 170 is located in the groove 133.

[0036] In this embodiment, the groove 133 of the top cover 130 is recessed toward the electrode assembly 120, so that a part of the first abutment portion 170 is located in the groove 133. This reduces the space occupied by the first abutment portion 170 and increases the reliability of the connection between the first insulating member 150 and the top cover 130, resulting in a better sealing effect between the top cover 130 and the first insulating member 150.

[0037] like Figure 3 , Figure 5 and Figure 6 As shown, in some embodiments, the first seal 160a includes a first sealing portion 161 and a second sealing portion 162 connected together. The first sealing portion 161 is located inside the terminal hole 131, and the first abutting portion 170 abuts against the first sealing portion 161. In this embodiment, exemplarily, the first sealing portion 161 is located inside the terminal hole 131 and abuts against the first abutting portion 170, which increases the sealing effect between the first insulating member 150, the hole wall of the terminal hole 131, and the first sealing portion 161, thereby improving the sealing effect of the single cell 100.

[0038] A portion of the wall of the electrode post hole 131 is a first inclined surface 132. The first inclined surface 132 is provided along one end of the electrode post hole 131 near the electrode assembly 120. The first sealing member 160a also includes a third sealing part 163 connected to the first sealing part 161 and the second sealing part 162. The third sealing part 163 is located between the first sealing part 161 and the second sealing part 162. The third sealing part 163 has a second inclined surface 1631, which abuts against the first inclined surface 132. The abutment between the second inclined surface 1631 and the first inclined surface 132 of the third sealing part 163 increases the sealing effect between the first sealing member 160a and the top cover 130, further improving the sealing effect of the single cell 100.

[0039] The first inclined surface 132 fits into the second inclined surface 1631, which increases the sealing effect between the first sealing element 160a and the hole wall of the pole hole 131.

[0040] In some embodiments, the second inclined surface 1631 is arranged circumferentially along the third sealing portion 163, and the distance between two second inclined surfaces 1631 arranged opposite each other along the first direction X gradually increases along the second direction Z from the first sealing portion 161 to the second sealing portion 162. This arrangement facilitates the processing of the second inclined surface 1631.

[0041] like Figure 3 and Figure 4 As shown, in some embodiments, the first electrode post 140a includes a first post segment 141, a second post segment 142, and a third post segment 143 connected sequentially in the second direction Z. A portion of the first post segment 141 passes through the electrode post hole 131 and the first insulating member 150. The side of the third post segment 143 opposite to the first post segment 141 is electrically connected to the electrode assembly 120. A first sealing portion 161 is located inside the electrode post hole 131, and a second sealing portion 162 abuts against the side of the second post segment 142 opposite to the electrode assembly 120. This allows the second sealing portion 162 to fit tightly around the second post segment 142, thereby increasing the sealing effect between the first sealing member 160a and the first electrode post 140a.

[0042] like Figure 3 and Figure 7 As shown, in some embodiments, the end of the first abutting portion 170 near the first sealing portion 161 is an arc surface 1701, which abuts against the first sealing portion 161. In this embodiment, the arc surface 1701 abuts against the first sealing portion 161, thereby increasing the sealing effect between the first abutting portion 170 and the first sealing portion 161 through an interference fit between the arc surface 1701 and the first sealing portion 161.

[0043] For example, the curved surface 1701 can be a sphere, a parabola, etc., without any specific limitations.

[0044] like Figure 3 , Figure 5 and Figure 7 As shown, in some embodiments, the first sealing portion 161 is provided with an abutment groove 1611, which is recessed along the second direction Z towards the electrode assembly 120, and a portion of the first abutment portion 170 is located within the abutment groove 1611. In this embodiment, by forming an abutment groove 1611 on the first sealing portion 161, a portion of the first abutment portion 170 abuts within the abutment groove 1611, thereby increasing the contact area between the first abutment portion 170 and the first sealing portion 161, and improving the sealing effect between the first insulating member 150 and the first sealing member 160a.

[0045] like Figure 8 and Figure 9 As shown, based on the above-described structure of the first insulating member 150, the first terminal post 140a, and the first sealing member 160a, in some embodiments, the single-cell battery 100 further includes a second insulating member 151, a second terminal post 140b, and a second sealing member 160b. The second insulating member 151 is connected to the side of the top cover 130 opposite to the electrode assembly 120, and the second insulating member 151 and the first insulating member 150 are spaced apart along a first direction X. The second terminal post 140b and the first terminal post 140a are spaced apart along the first direction X, and the second terminal post 140b is electrically connected to the second tab 123. The second sealing member 160b is disposed around the second terminal post 140b, a portion of the second sealing member 160b is located within the terminal post hole 131, and the second insulating member 151 includes a second abutment portion 171, which protrudes along a second direction Z towards the electrode assembly 120, and abuts against the second sealing member 160b.

[0046] In this embodiment, the second abutting portion 171 of the second insulating member 151 is provided to protrude along the second direction Z so as to achieve partial abutment between the second abutting portion 171 and the second sealing member 160b located in the electrode hole 131. In this way, the gap between the second sealing member 160b and the second insulating member 151 is reduced, the sealing performance between the second sealing member 160b and the second insulating member 151 is improved, and the airtightness of the single cell 100 is further enhanced.

[0047] It should be noted that, in the above embodiments, exemplarily, the materials of the first insulating member 150 and / or the second insulating member 151 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations. Exemplarily, the materials of the first sealing member 160a and the second sealing member 160b can be selected from nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations.

[0048] According to the type of metal ions, the single battery provided in this embodiment can be a lithium-ion battery, a sodium-ion battery, etc. Furthermore, according to the physical state of the electrolyte, the single battery provided in this embodiment can be a liquid battery, i.e., using a liquid electrolyte. Exemplarily, the electrode post can include a positive electrode post and a negative electrode post, and the electrode assembly 120 can be manufactured using a winding process or a stacking process. One of the first tab 122 and the second tab 123 is a positive tab, and the other is a negative tab. The electrode body 121 is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet, and the material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0049] Of course, the single cell provided in this embodiment can also be a solid-state battery, that is, a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. No specific limitation is made on the type of single cell here.

[0050] This application also provides a battery pack, including the single battery cell 100 in any of the above embodiments.

[0051] The embodiments of this application propose a battery pack having a single battery cell 100 as described in any of the above embodiments. Therefore, it has all the beneficial effects of the single battery cell 100 provided in any of the above embodiments, which will not be elaborated here.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A unit cell having a first direction (X) and a second direction (Z) perpendicular to each other, characterized by, include: Casing (110); The top cover (130) is connected to the housing (110), and the top cover (130) is provided with a pole hole (131) that extends through the second direction (Z). An electrode assembly (120) is located inside the housing (110). The electrode assembly (120) includes an electrode body (121) and a first tab (122) and a second tab (123) connected to both ends of the electrode body (121) along the first direction (X). A first insulating element (150) is connected to the side of the top cover (130) opposite to the electrode assembly (120); The first pole post (140a) is disposed along the second direction (Z) through the first insulating member (150) and the pole post hole (131), and the first pole post (140a) is electrically connected to the first pole tab (122); A first seal (160a) is disposed around the first electrode post (140a), a portion of the first seal (160a) is located within the electrode post hole (131), and the first insulating member (150) includes a first abutment portion (170) which protrudes along the second direction (Z) toward the electrode assembly (120) and abuts against the first seal (160a).

2. The cell according to claim 1, wherein The top cover (130) has a groove (133) on the side facing the first insulating member (150). The groove (133) is recessed along the second direction (Z) towards the electrode assembly (120). The groove wall of the groove (133) surrounds the first pole post (140a), and the groove (133) communicates with the pole post hole (131). A portion of the first abutment (170) is located in the groove (133).

3. The cell according to claim 1, wherein The first seal (160a) includes a first sealing part (161) and a second sealing part (162) connected together. The first sealing part (161) is located inside the pole hole (131). The first abutting part (170) abuts against the first sealing part (161). The second sealing part (162) abuts against a portion of the top cover (130) and the first pole (140a).

4. The cell according to claim 3, wherein A portion of the hole wall of the electrode post hole (131) is a first inclined surface (132). The first inclined surface (132) is disposed along the electrode post hole (131) towards one end close to the electrode assembly (120). The first seal (160a) also includes a third seal (163) connected to the first seal (161) and the second seal (162). The third seal (163) is located between the first seal (161) and the second seal (162). The third seal (163) is provided with a second inclined surface (1631), which abuts against the first inclined surface (132).

5. The cell according to claim 4, wherein The second inclined surface (1631) is arranged circumferentially along the third sealing part (163), and the distance between the two second inclined surfaces (1631) arranged opposite each other along the first direction (X) gradually increases along the second direction (Z) from the first sealing part (161) to the second sealing part (162).

6. The cell according to claim 3, wherein The first electrode post (140a) includes a first column segment (141), a second column segment (142) and a third column segment (143) connected in sequence in the second direction (Z). A portion of the first column segment (141) passes through the electrode post hole (131) and the first insulating member (150). The third column segment (143) is electrically connected to the electrode assembly (120) on the side opposite to the first column segment (141). The first sealing part (161) is located inside the electrode post hole (131), and the second sealing part (162) abuts against the side of the second column segment (142) away from the electrode assembly (120).

7. The cell according to claim 3, wherein The end of the first abutting part (170) near the first sealing part (161) is an arc surface (1701), which abuts against the first sealing part (161).

8. The cell according to claim 3, wherein The first sealing part (161) is provided with an abutment groove (1611), which is recessed in the direction of the second direction (Z) toward the electrode assembly (120), and a portion of the first abutment part (170) is located in the abutment groove (1611).

9. The single-cell battery according to any one of claims 1 to 8, characterized in that, The single cell (100) also includes: The second insulating member (151) is connected to the side of the top cover (130) opposite to the electrode assembly (120), and the second insulating member (151) and the first insulating member (150) are spaced apart along the first direction (X); The second pole post (140b) is spaced apart from the first pole post (140a) along the first direction (X), and the second pole post (140b) is electrically connected to the second tab (123); A second seal (160b) is disposed around the second pole post (140b), a portion of the second seal (160b) is located within the pole post hole (131), and the second insulating member (151) includes a second abutment portion (171) which protrudes along the second direction (Z) toward the electrode assembly (120) and abuts against the second seal (160b).

10. A battery pack, characterized by, Includes a single cell (100) as described in any one of claims 1 to 9.

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