A battery cell and a battery pack

Abstract

This application provides a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes: a housing, an electrode assembly disposed within the housing, an end cap connected to the housing and having a first through hole, a terminal post passing through the first through hole and electrically connected to the electrode assembly, and a sealing member surrounding the terminal post. The wall of the first through hole is beveled, and the diameter of the hole wall gradually increases towards the electrode assembly. The sealing member includes a first sealing portion and a second sealing portion connected together. The first sealing portion is located within the first through hole, and the second sealing portion is located on the side of the end cap away from the electrode assembly. The first sealing portion abuts against the terminal post and is interference-fitted with the beveled surface. The battery cell provided by this application increases the contact area between the sealing member and the end cap and reduces the possibility of the sealing member detaching from the end cap in the direction away from the electrode assembly, thereby improving the sealing reliability of the sealing member.

Description

Technical Field

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

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] Battery cells are an important component of battery packs. Battery cells typically have sealing elements at their end caps to seal the gap between the terminal and the end cap using the elasticity of these elements; however, the sealing reliability of current sealing elements is relatively poor, affecting the airtightness of the battery cells. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem of poor sealing reliability of current sealing components.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] case;

[0008] Electrode assembly, disposed within the housing;

[0009] An end cap is connected to the housing, and the end cap is provided with a first through hole extending along the thickness direction of the end cap;

[0010] An electrode post is inserted through the first through hole and electrically connected to the electrode assembly. The wall of the first through hole is inclined, and the diameter of the wall of the first through hole gradually increases towards the electrode assembly.

[0011] A sealing element is disposed around the electrode post. The sealing element includes a first sealing portion and a second sealing portion connected to each other. The first sealing portion is located inside the first through hole, and the second sealing portion is located on the side of the end cap away from the electrode assembly. The first sealing portion abuts against the electrode post and is interference-fitted with the inclined surface.

[0012] In some embodiments of the first aspect, the battery cell further includes a first insulating member located on the side of the end cap away from the electrode assembly and connected to the end cap and the terminal post respectively; the first insulating member is provided with a second through hole, the terminal post passes through the second through hole, and the second sealing portion is located in the second through hole.

[0013] In some embodiments of the first aspect, the electrode post includes a first electrode post portion and a second electrode post portion, the first electrode post portion passing through the first through hole and electrically connected to the electrode assembly, the first sealing portion abutting against the first electrode post portion, the second electrode post portion being connected to the end of the first electrode post portion away from the electrode assembly and connected to the first insulating member, and the second sealing portion abutting against the second electrode post portion and the end cap respectively.

[0014] In some embodiments of the first aspect, the battery cell further includes a conductive element and an insulating heat-insulating element disposed within the housing. The conductive element is located between the end cap and the electrode assembly and is connected to the terminal post and the electrode assembly, respectively. The conductive element and the insulating heat-insulating element are both disposed around the terminal post. The insulating heat-insulating element is connected to the side of the end cap near the conductive element and abuts against the end of the first sealing portion away from the second sealing portion.

[0015] In some embodiments of the first aspect, the battery cell further includes a second insulating member disposed within the housing, the second insulating member being connected to the end cap on the side near the electrode assembly, the second insulating member having a third through hole, the electrode post passing through the third through hole, and the insulating and heat-insulating member being located within the third through hole.

[0016] In some embodiments of the first aspect, the end cap is provided with a positioning groove on the side near the electrode assembly, the positioning groove is recessed in a direction away from the electrode assembly, the positioning groove is arranged around the insulating heat insulation member and communicates with the third through hole, and a portion of the second insulating member is located in the positioning groove.

[0017] In some embodiments of the first aspect, the insulating heat insulation member is interference-fitted with the wall of the third through hole, and a portion of the second insulating member is interference-fitted with the wall of the positioning groove.

[0018] In some embodiments of the first aspect, the insulating heat insulation member includes a heat insulation layer and a sealing layer stacked on top of each other, the heat insulation layer being located on the side of the conductive member closer to the first sealing portion, and the sealing layer being located on the side of the heat insulation layer closer to the first sealing portion.

[0019] In some embodiments of the first aspect, the first sealing portion has an arcuate surface that protrudes toward the inclined surface, the arcuate surface abutting against the inclined surface.

[0020] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0021] The beneficial effects of this application are as follows:

[0022] The battery cell provided in this application has a first through-hole with a beveled wall, and the diameter of the first through-hole gradually increases towards the electrode assembly. A sealing element surrounds the electrode post, with a first sealing portion located inside the first through-hole and a second sealing portion located on the side of the end cover away from the electrode assembly. The first sealing portion abuts against the electrode post and is interference-fitted with the beveled wall. This increases the contact area between the sealing element and the end cover and reduces the possibility of the sealing element detaching from the end cover away from the electrode assembly, thereby improving the sealing reliability of the sealing element and enhancing the airtightness of the battery cell.

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] 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.

[0025] Figure 1 A three-dimensional structural schematic diagram of a battery cell is shown in some embodiments of this application;

[0026] Figure 2 It shows Figure 1 A schematic diagram of the decomposed structure;

[0027] Figure 3 It shows Figure 1 A schematic diagram of the exploded structure of some of the components;

[0028] Figure 4 It shows Figure 1 A schematic diagram of the structure of some of the central components from one perspective;

[0029] Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0030] Figure 6 It shows Figure 5 A magnified structural diagram of region B in the middle;

[0031] Figure 7 It shows Figure 6 A cross-sectional view of the central sealing element;

[0032] Figure 8 The diagram shows a cross-sectional view of the insulating and heat-insulating component in some other embodiments of this application.

[0033] Explanation of key component symbols:

[0034] 100 - Battery cell; 110 - Housing; 120 - End cap; 121 - First through hole; 122 - Beveled surface; 123 - Positioning groove; 130 - Terminal post; 131 - First terminal post portion; 132 - Second terminal post portion; 140 - Electrode assembly; 150 - Sealing element; 151 - First sealing portion; 152 - Arc surface; 153 - Second sealing portion; 160 - First insulating element; 161 - Second through hole; 170 - Conductive element; 180 - Insulating and heat-insulating element; 181 - Heat-insulating layer; 182 - Sealing layer; 190 - Second insulating element; 191 - Third through hole; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of the 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.

[0036] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "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" or "below" 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.

[0038] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0039] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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.

[0040] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0041] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0042] The battery cell is an important component of the battery pack. The end cap of the battery cell usually has a terminal post and a seal, and the elasticity of the seal is used to seal the gap between the terminal post and the end cap; however, the sealing reliability of the current seal is poor, which affects the airtightness of the battery cell.

[0043] In addition, when manufacturing a battery cell, conductive components are connected to the electrode assembly and the terminal post respectively to achieve electrical connection between the electrode assembly and the terminal post; however, the connection between the conductive components and the terminal post is by welding, and the heat generated by welding can easily be transferred to the seal, causing damage to the seal.

[0044] like Figure 1 and Figure 2As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly used in electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly used in electrical devices or energy storage devices without taking the form of a battery pack, and no specific limitation is made to the application scenarios of the battery cell 100 here.

[0045] 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, and range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, 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 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, etc.; 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, and temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0046] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment includes: a housing 110, an electrode assembly 140, an end cap 120, a terminal post 130, and a seal 150.

[0047] Combination Figures 4 to 7 As shown, the electrode assembly 140 is disposed within the housing 110; the end cap 120 is connected to the housing 110, and the end cap 120 is provided with a circumferential groove along the thickness direction of the end cap 120 (i.e., Figure 6 A first through hole 121 (in the vertical direction) is formed; an electrode post 130 is inserted through the first through hole 121 and electrically connected to the electrode assembly 140. The wall of the first through hole 121 is a slope 122, and the diameter of the wall of the first through hole 121 gradually increases towards the electrode assembly 140; a sealing member 150 is arranged around the electrode post 130. The sealing member 150 includes a first sealing part 151 and a second sealing part 153 connected to each other. The first sealing part 151 is located inside the first through hole 121, and the second sealing part 153 is located on the side of the end cap 120 away from the electrode assembly 140. The first sealing part 151 abuts against the electrode post 130 and is interference-fitted with the slope 122.

[0048] For example, the materials of the end cap 120 and / or the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0049] It is understood that in the battery cell 100 provided in this embodiment, the wall of the first through hole 121 of the end cap 120 is a slope 122, and the diameter of the wall of the first through hole 121 gradually increases towards the electrode assembly 140. The sealing member 150 is disposed around the electrode post 130. The first sealing part 151 of the sealing member 150 is located inside the first through hole 121, and the second sealing part 153 of the sealing member 150 is located on the side of the end cap 120 away from the electrode assembly 140. The first sealing part 151 abuts against the electrode post 130 and is interference-fitted with the slope 122. In this way, the contact area between the sealing member 150 and the end cap 120 is increased, and the possibility of the sealing member 150 detaching from the end cap 120 in the direction away from the electrode assembly 140 is reduced, thereby improving the sealing reliability of the sealing member 150 and improving the airtightness of the battery cell 100.

[0050] like Figure 6 As shown, in some embodiments, the first sealing part 151 has an arc surface 152 that protrudes toward the inclined surface 122, and the arc surface 152 abuts against the inclined surface 122 to achieve an interference fit between the first sealing part 151 and the inclined surface 122 through the arc surface 152.

[0051] For example, the curved surface 152 can be a sphere, a parabola, etc., without any specific limitations.

[0052] In some other embodiments, the first sealing part 151 has an inclined plane that abuts against the inclined surface 122 to achieve an interference fit between the plane and the inclined surface 122. The specific manner in which the first sealing part 151 and the inclined surface 122 are interference fitted is not limited here.

[0053] like Figure 2 as well as Figures 4 to 6 As shown, in some embodiments, the battery cell 100 further includes a first insulating member 160. The first insulating member 160 is located on the side of the end cap 120 away from the electrode assembly 140 and is connected to the end cap 120 and the terminal post 130 respectively, so that the terminal post 130 and the end cap 120 are mutually insulated, thereby reducing the risk of short circuit in the battery cell 100. At the same time, the first insulating member 160 is provided with a second through hole 161, the terminal post 130 passes through the second through hole 161, and the second sealing part 153 is located in the second through hole 161, thereby sealing the gap formed by the terminal post 130, the end cap 120 and the first insulating member 160.

[0054] For example, the materials of the first insulating element 160 and / or the second insulating element 190 may 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.

[0055] like Figure 5 and Figure 6 As shown, the electrode post 130 further includes a first electrode post portion 131 and a second electrode post portion 132. The first electrode post portion 131 passes through the first through hole 121 and is electrically connected to the electrode assembly 140. The first sealing portion 151 abuts against the first electrode post portion 131 to seal the gap between the first electrode post portion 131 and the end cap 120. The second electrode post portion 132 is connected to the end of the first electrode post portion 131 away from the electrode assembly 140. The second sealing portion 153 abuts against the second electrode post portion 132 and the end cap 120 respectively to seal the gap formed by the second electrode post portion 132, the end cap 120 and the first insulating member 160.

[0056] It should be noted that when the terminal 130 includes a positive terminal and a negative terminal, either the positive terminal or the negative terminal can adopt the design of the first terminal portion 131 and the second terminal portion 132 described above. That is, the negative terminal and / or the positive terminal includes the first terminal portion 131 and the second terminal portion 132 connected to each other. No specific limitation is made on the structure of the terminal 130 here.

[0057] like Figure 2 as well as Figures 4 to 6 As shown, in some embodiments, the battery cell 100 further includes a conductive element 170 and an insulating and heat-insulating element 180 disposed within the housing 110. The conductive element 170 is located between the end cap 120 and the electrode assembly 140, and is connected to the terminal post 130 and the electrode assembly 140 respectively, so that the terminal post 130 and the electrode assembly 140 are electrically connected. The conductive element 170 and the insulating and heat-insulating element 180 are both disposed around the terminal post 130. The insulating and heat-insulating element 180 is connected to the side of the end cap 120 near the conductive element 170, and abuts against the end of the first sealing portion 151 away from the second sealing portion 153.

[0058] It should be noted that the connection between the conductive element 170 and the electrode post 130 is welding, and the connection between the conductive element 170 and the electrode assembly 140 can be welding, snap-fitting, bonding, screw connection, etc., without specific restrictions.

[0059] Understandably, the aforementioned insulating and heat-insulating component 180 can isolate some of the heat radiation, thereby reducing the adverse effects of the heat generated during the welding of the conductive component 170 and the terminal post 130 on the sealing component 150. Furthermore, since both the conductive component 170 and the insulating and heat-insulating component 180 are arranged around the first terminal post 131, i.e., both the conductive component 170 and the insulating and heat-insulating component 180 are annular, this increases the current-carrying area between the terminal post 130 and the conductive component 170, thereby improving the current-carrying capacity of the battery cell 100.

[0060] For example, the materials of the conductive element 170 and / or the electrode 130 can be selected from metallic conductive materials (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (e.g., carbon-based materials, superconductors, semiconductors, etc.), without specific limitations. It should be noted that when the electrode 130 includes a negative electrode, and the negative electrode includes a first electrode portion 131 and a second electrode portion 132 connected to each other, the material of the first electrode portion 131 can be copper, and the material of the second electrode portion 132 can be aluminum.

[0061] like Figure 2 as well as Figures 4 to 6 As shown, the battery cell 100 further includes a second insulating member 190 disposed in the housing 110. The second insulating member 190 is connected to the end cap 120 on the side near the electrode assembly 140. A third through hole 191 is provided on the second insulating member 190. The electrode post 130 passes through the third through hole 191. The insulating and heat-insulating member 180 is located in the third through hole 191.

[0062] Understandably, since the second insulating member 190 is connected to the end cap 120 on the side near the electrode assembly 140, the end cap 120 and the electrode assembly 140 are insulated from each other, reducing the risk of short circuit in the battery cell 100. The third through hole 191 facilitates the assembly of the insulating and heat-insulating member 180 and reduces the possibility of the insulating and heat-insulating member 180 moving relative to the conductive member 170, thereby enhancing the stability of the insulating and heat-insulating member 180.

[0063] like Figure 2 as well as Figures 4 to 6 As shown, the end cap 120 is further provided with a positioning groove 123 on the side near the electrode assembly 140. The positioning groove 123 is recessed in the direction away from the electrode assembly 140. The positioning groove 123 is provided around the insulating heat insulation member 180 and communicates with the third through hole 191. A part of the second insulating member 190 is located in the positioning groove 123.

[0064] It is understandable that the positioning groove 123 is used to position the second insulating member 190, thereby facilitating the assembly of the second insulating member 190 and reducing the possibility of the second insulating member 190 moving relative to the end cap 120, thereby enhancing the stability of the second insulating member 190 and the insulating and heat-insulating member 180.

[0065] like Figure 6 As shown, the insulating heat insulation component 180 is further interference-fitted with the wall of the third through hole 191, and a portion of the second insulating component 190 is interference-fitted with the wall of the positioning groove 123, thereby further enhancing the stability of the insulating heat insulation component 180 and the second insulating component 190.

[0066] like Figure 6 and Figure 8 As shown, the insulating and heat-insulating member 180 further includes a heat-insulating layer 181 and a sealing layer 182 stacked on each other. The heat-insulating layer 181 is located on the side of the conductive member 170 near the first sealing part 151, and the sealing layer 182 is located on the side of the heat-insulating layer 181 near the first sealing part 151.

[0067] For example, the material of the seal 150 and / or the material of the sealing layer 182 may be nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations.

[0068] Understandably, the heat insulation layer 181 can isolate some of the heat radiation, thereby reducing the adverse effects of the heat generated during welding on the seal 150. The combination of the sealing layer 182 and the seal 150 can better seal the gap between the terminal post 130 and the end cap 120, thereby further improving the sealing reliability of the battery cell 100.

[0069] Of course, in other embodiments, the insulating and heat-insulating component 180 can also be an integral structure. In this case, its material can be liquid crystal polymer (LCP) or polyether ether ketone (PEEK). Since liquid crystal polymer and polyether ether ketone are more resistant to high temperature and electrolyte corrosion, choosing one of them as the material of the insulating and heat-insulating component 180 can better protect the seal 150 from the effects of high temperature and the corrosion of electrolyte inside the housing 110.

[0070] like Figure 7 As shown, in some embodiments, the first sealing part 151 and the second sealing part 153 are integrally formed, which facilitates processing and manufacturing, reduces manufacturing costs, and makes the sealing reliability of the seal 150 higher.

[0071] It should be noted that unibody molding includes stamping, injection molding, die casting, extrusion, blow molding, 3D printing, etc., and no specific type of unibody molding is limited here.

[0072] It should be noted that the battery cell 100 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 100 can be cuboid, cylindrical, flat, or other shapes, and no specific limitation is made here. According to the packaging method, the battery cell 100 provided in this embodiment can be a square battery, a cylindrical battery, a pouch battery, etc., and no specific limitation is made here.

[0073] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 100 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 130 may include a positive electrode post and a negative electrode post. The electrode assembly 140 may be manufactured using a winding process or a stacking process. The electrode assembly 140 may include an electrode body and electrode tabs, the electrode tabs including a positive electrode tab and a negative electrode tab. The electrode body 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. 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 electrode 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 electrode 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.

[0074] Of course, the battery cell 100 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. The type of battery cell 100 is not specifically limited here.

[0075] It should be noted that when the battery cell 100 has two mutually perpendicular directions, a first direction X, a second direction Y, and a third direction Z, the third direction Z is the thickness direction of the end cap 120. The end cap 120 is located on the side of the housing 110 along the third direction Z. The through-hole 121, the second through-hole 161, and the third through-hole 191 all have the third direction Z as their through-holes. The diameter of the hole wall of the first through-hole 121 gradually increases along the third direction Z towards the electrode assembly 140. The second sealing part 153 is located on the side of the end cap 120 away from the electrode assembly 140 along the third direction Z. When the electrode post 130 includes a positive electrode post and a negative electrode post, the positive electrode post and the negative electrode post are spaced apart along the first direction X. When there are multiple electrode assemblies 140, the multiple electrode assemblies 140 are arranged along the second direction Y.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0077] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0078] In the description of this specification, the references to terms such as "some embodiments," "one embodiment," "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.

[0079] 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 battery cell, characterized in that, include: Casing (110); An electrode assembly (140) is disposed within the housing (110); An end cap (120) is connected to the housing (110), and the end cap (120) is provided with a first through hole (121) extending along the thickness direction of the end cap (120). The electrode post (130) is inserted through the first through hole (121) and electrically connected to the electrode assembly (140). The wall of the first through hole (121) is a slope (122), and the diameter of the wall of the first through hole (121) gradually increases towards the electrode assembly (140). A sealing element (150) is provided around the pole post (130). The sealing element (150) includes a first sealing part (151) and a second sealing part (153) connected to each other. The first sealing part (151) is located in the first through hole (121), and the second sealing part (153) is located on the side of the end cap (120) away from the electrode assembly (140). The first sealing part (151) abuts against the pole post (130) and is interference-fitted with the inclined surface (122).

2. The battery cell according to claim 1, characterized in that, The battery cell further includes a first insulating member (160), which is located on the side of the end cap (120) away from the electrode assembly (140) and is connected to the end cap (120) and the terminal post (130) respectively; the first insulating member (160) is provided with a second through hole (161), the terminal post (130) passes through the second through hole (161), and the second sealing part (153) is located in the second through hole (161).

3. The battery cell according to claim 2, characterized in that, The electrode post (130) includes a first electrode post portion (131) and a second electrode post portion (132). The first electrode post portion (131) passes through the first through hole (121) and is electrically connected to the electrode assembly (140). The first sealing portion (151) abuts against the first electrode post portion (131). The second electrode post portion (132) is connected to the end of the first electrode post portion (131) away from the electrode assembly (140) and is connected to the first insulating member (160). The second sealing portion (153) abuts against the second electrode post portion (132) and the end cap (120) respectively.

4. The battery cell according to claim 1, characterized in that, The battery cell also includes a conductive element (170) and an insulating heat-insulating element (180) disposed within the housing (110). The conductive element (170) is located between the end cap (120) and the electrode assembly (140) and is connected to the terminal post (130) and the electrode assembly (140) respectively. The conductive element (170) and the insulating heat-insulating element (180) are both arranged around the terminal post (130). The insulating heat-insulating element (180) is connected to the side of the end cap (120) near the conductive element (170) and abuts against the end of the first sealing part (151) away from the second sealing part (153).

5. The battery cell according to claim 4, characterized in that, The battery cell also includes a second insulating member (190) disposed in the housing (110). The second insulating member (190) is connected to the end cap (120) on the side near the electrode assembly (140). The second insulating member (190) is provided with a third through hole (191). The electrode post (130) passes through the third through hole (191). The insulating and heat-insulating member (180) is located in the third through hole (191).

6. The battery cell according to claim 5, characterized in that, The end cap (120) is provided with a positioning groove (123) on the side near the electrode assembly (140). The positioning groove (123) is recessed in a direction away from the electrode assembly (140). The positioning groove (123) is arranged around the insulating heat insulation member (180) and communicates with the third through hole (191). A part of the second insulating member (190) is located in the positioning groove (123).

7. The battery cell according to claim 6, characterized in that, The insulating heat insulation component (180) is interference-fitted with the wall of the third through hole (191), and a portion of the second insulating component (190) is interference-fitted with the wall of the positioning groove (123).

8. The battery cell according to claim 4, characterized in that, The insulating and heat-insulating component (180) includes a heat-insulating layer (181) and a sealing layer (182) stacked on each other. The heat-insulating layer (181) is located on the side of the conductive component (170) near the first sealing part (151), and the sealing layer (182) is located on the side of the heat-insulating layer (181) near the first sealing part (151).

9. The battery cell according to any one of claims 1 to 8, characterized in that, The first sealing part (151) has an arc surface (152) that protrudes toward the inclined surface (122), and the arc surface (152) abuts against the inclined surface (122).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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