Battery cell and battery pack

Abstract

The application provides a battery monomer and a battery pack, and relates to the technical field of batteries. In the battery monomer, the pole column comprises a first pole column body and a second pole column body connected with each other, the second pole column body is electrically connected with the electrode assembly through a conductive piece, the side of the first pole column body away from the electrode assembly is provided with a groove, the groove is recessed towards the direction close to the electrode assembly, and at least part of the second pole column body is located in the groove. In this way, the space occupied by the pole column in the axial direction thereof can be reduced, so that the space utilization rate is improved. Meanwhile, at least part of the conductive piece is located on the outer circumferential side of the first pole column body, so that the space occupied by the conductive piece in the axial direction of the pole column can be reduced, and the space utilization rate is further improved. In this way, the energy density of the battery monomer is improved. In addition, through the arrangement of the groove of the first pole column body, the material of the first pole column body can be reduced, so that the manufacturing cost of the battery monomer is reduced.

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] The battery cell is an important component of the battery pack. Conductive components within the battery cell are electrically connected to the terminals and electrode assembly, facilitating charging and discharging. However, the terminals and conductive components occupy considerable space along the axial direction of the terminals, thus affecting the energy density of the battery cell. 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 that the terminals and conductive components occupy a lot of space in the axial direction of the terminals.

[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 battery cell having a first orientation. The battery cell includes: a housing; an electrode assembly disposed within the housing; an end cap connected to the housing, the end cap having a mounting hole extending through along the first orientation; a terminal post passing through the mounting hole, the terminal post including a first terminal post body and a second terminal post body connected together, the first terminal post body being located on the side of the second terminal post body closer to the electrode assembly, the side of the first terminal post body away from the electrode assembly having a groove, the groove being recessed towards the electrode assembly, at least a portion of the second terminal post body being located within the groove; and a conductive element disposed within the housing, the conductive element being electrically connected to the first terminal post body and the electrode assembly respectively, at least a portion of the conductive element being located on the outer periphery of the first terminal post body.

[0006] In some embodiments of the first aspect, the first electrode body includes a body portion and a protrusion, the protrusion being connected to the side of the body portion away from the electrode assembly and being inclined relative to the first direction, the protrusion surrounding the second electrode body, the protrusion and the body portion forming the groove, the conductive element being electrically connected to the body portion, and at least a portion of the conductive element being located on the outer periphery of the body portion.

[0007] In some embodiments of the first aspect, the conductive element has a connecting hole extending along the first direction, the body portion passes through the connecting hole, and the outer peripheral side of the body portion is connected to the hole wall of the connecting hole.

[0008] In some embodiments of the first aspect, the outer peripheral side of the first electrode body is welded to the wall of the connecting hole to form a weld, the weld being located on the side of the conductive element near the electrode assembly and surrounding the body portion.

[0009] In some embodiments of the first aspect, the conductive element includes a first conductive portion and a second conductive portion connected to each other, the first conductive portion having the connecting hole, the weld being located on the side of the first conductive portion near the electrode assembly, at least a portion of the second conductive portion being located on the outer periphery of the first conductive portion, the second conductive portion being electrically connected to the electrode assembly, and the dimension of the first conductive portion along the first direction being greater than the dimension of the second conductive portion along the first direction.

[0010] In some embodiments of the first aspect, the battery cell further includes a seal disposed around the terminal post, the entire seal being located within the mounting hole, the wall of the mounting hole having a first inclined surface, the terminal post having a second inclined surface formed by at least a portion of the outer peripheral side of the protrusion and at least a portion of the outer peripheral side of the second terminal post body, the body having a first surface disposed near the electrode assembly, the angle formed between the first inclined surface and the first surface being a first obtuse angle, the angle formed between the second inclined surface and the first surface being a second obtuse angle, and the seal being respectively fitted to the first inclined surface and the second inclined surface.

[0011] In some embodiments of the first aspect, the outer peripheral side of the seal has a third inclined surface that abuts against the first inclined surface, the angle formed between the third inclined surface and the first surface being a third obtuse angle, the third obtuse angle being equal to the first obtuse angle; and / or, the inner peripheral side of the seal has a fourth inclined surface that abuts against the second inclined surface, the angle formed between the fourth inclined surface and the first surface being a fourth obtuse angle, the fourth obtuse angle being equal to the second obtuse angle.

[0012] In some embodiments of the first aspect, the seal has a first end face disposed near the electrode assembly, and at least a portion of the first end face is disposed near the first surface relative to the side of the protrusion away from the electrode assembly along the first direction.

[0013] In some embodiments of the first aspect, the seal has a second end face disposed away from the first end face, and along the first direction, the second end face is disposed close to the first surface on the side of the protrusion away from the electrode assembly.

[0014] In some embodiments of the first aspect, the battery cell further includes a first insulating member located within the housing, the first insulating member being disposed around the first terminal body and located on the side of the end cap near the electrode assembly, the conductive member being located on the side of the first insulating member near the electrode assembly, and the first insulating member abutting against the second inclined surface and the side of the sealing member near the electrode assembly, respectively.

[0015] In some embodiments of the first aspect, the two opposite sides of the first insulating member along the first direction are both planar.

[0016] In some embodiments of the first aspect, the first insulating member has a first clearance groove on the side away from the end cap, and at least a portion of the conductive member is located within the first clearance groove.

[0017] In some embodiments of the first aspect, the end cap is provided with a second clearance groove communicating with the mounting hole on the side near the electrode assembly, and the portion of the first insulating member having the first clearance groove is located within the second clearance groove.

[0018] In some embodiments of the first aspect, the battery cell further includes a second insulating member disposed around the second electrode body, the second insulating member including a first insulating portion, at least a portion of the first insulating portion being located within the mounting hole, and the first insulating portion abutting against the first inclined surface, the second inclined surface and the side of the seal away from the electrode assembly.

[0019] In some embodiments of the first aspect, the second insulating member further includes a second insulating portion connected to the first insulating portion, the second insulating portion being disposed around the first insulating portion, the second electrode body including a main body portion and a limiting portion connected together, the main body portion being located on the side of the limiting portion near the electrode assembly and being connected to the main body portion and the protrusion respectively, at least a portion of the main body portion being located within the groove, and the second insulating portion being disposed between the limiting portion and the end cap along the first direction.

[0020] In some embodiments of the first aspect, the end cap includes a cover plate and a flange, the cover plate being connected to the housing and the flange respectively, the flange protruding from the side of the cover plate away from the electrode assembly, the flange being inclined relative to the first direction, the mounting hole penetrating the cover plate and the flange along the first direction, and the second insulating portion being disposed between the limiting portion and the flange along the first direction.

[0021] In some embodiments of the first aspect, the outer peripheral side of the flange has a fifth inclined surface, the fifth inclined surface being connected to the cover plate, and the angle formed between the fifth inclined surface and the first surface is an acute angle.

[0022] In some embodiments of the first aspect, the second insulating member further includes a third insulating portion connected to the second insulating portion, the third insulating portion being disposed around the flange and connected to the fifth inclined surface and the cover plate, respectively.

[0023] In some embodiments of the first aspect, the second insulating member further includes a fourth insulating portion connected to the second insulating portion, the fourth insulating portion being located on the side of the second insulating portion away from the electrode assembly, and the fourth insulating portion covering the outer peripheral side of the limiting portion.

[0024] In some embodiments of the first aspect, the first obtuse angle and the second obtuse angle are equal. In a second aspect, embodiments of this application provide a battery pack comprising the battery cells described in any of the embodiments of the first aspect above.

[0025] The beneficial effects of this application are as follows: The battery cell provided in this application includes a first electrode body and a second electrode body connected together. The first electrode body has a groove on the side away from the electrode assembly, recessed towards the electrode assembly. At least a portion of the second electrode body is located within the groove, either partially or completely. This reduces the axial space occupied by the electrode, thus improving space utilization. Simultaneously, since at least a portion of the conductive element is located on the outer periphery of the first electrode body (either partially or completely), the axial space occupied by the conductive element is reduced, further improving space utilization. Therefore, this contributes to increasing the energy density of the battery cell. Furthermore, the groove in the first electrode body reduces the material used in the first electrode body, thereby lowering the manufacturing cost of the battery cell.

[0026] 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

[0027] 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.

[0028] Figure 1 A three-dimensional structural schematic diagram of a battery cell is shown in some embodiments of this application; Figure 2 It shows Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 It shows Figure 1 A schematic diagram of the decomposed structure; Figure 4 It shows Figure 1 A three-dimensional structural diagram of a battery cell when the casing and electrode assembly are hidden. Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure at point BB; Figure 6 It shows Figure 5 A magnified structural diagram of region C in the middle; Figure 7 It shows Figure 6 A cross-sectional structural diagram of the first pole body; Figure 8 It shows Figure 6 A cross-sectional view of the central sealing element; Figure 9 This application shows a three-dimensional structural diagram of a battery cell with its housing and electrode assembly hidden in some other embodiments. Figure 10 It shows Figure 9 Schematic diagram of the cross-sectional structure at point DD; Figure 11 It shows Figure 10 A magnified structural diagram of region E in the middle; Figure 12 This invention provides a three-dimensional structural schematic diagram of a battery cell with its housing and electrode assembly hidden in some other embodiments of the present application. Figure 13 It shows Figure 12 Schematic diagram of the cross-sectional structure at the middle FF point; Figure 14It shows Figure 13 A magnified structural diagram of region G in the middle.

[0029] Explanation of key component symbols: 100 - Battery cell; 110 - Housing; 120 - Electrode assembly; 130 - End cap; 131 - Mounting hole; 132 - First bevel; 133 - Second clearance groove; 134 - Cover plate; 135 - Flanged edge; 1351 - Fifth bevel; 140 - Terminal post; 141 - First terminal post body; 1411 - Groove; 1412 - First surface; 1413 - Body portion; 1414 - Protrusion; 142 - Second terminal post body; 1421 - Main body portion; 1422 - Limiting portion; 1423 - Second surface; 143 - Second 150 - Inclined surface; 151 - Conductive component; 151 - First conductive part; 1511 - Connecting hole; 1512 - Weld; 152 - Second conductive part; 160 - Sealing component; 161 - Third inclined surface; 162 - Fourth inclined surface; 163 - First end face; 164 - Second end face; 170 - First insulating component; 171 - First clearance groove; 180 - Second insulating component; 181 - First insulating part; 182 - Second insulating part; 183 - Third insulating part; 184 - Fourth insulating part; Z - First direction; X - Second direction; Y - Third direction. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 non-detachable connections (e.g., welding, riveting, etc.), detachable connections (e.g., snap-fit, screw-fit, plug-in, etc.), or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections 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.

[0035] 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.

[0036] 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.

[0037] The battery cell is a crucial component of the battery pack. Currently, battery cells use conductive components to electrically connect to the terminals and electrode assemblies, facilitating charging and discharging of the battery cell. However, along the axial direction of the terminals (e.g., ... Figure 1As shown, the axial direction of the terminal post is parallel to the first direction Z. The terminal post and conductive components occupy a significant amount of space, thus affecting the energy density of the battery cell. Furthermore, to achieve reliable sealing, the current structures of the terminal post and sealing components are quite complex, also occupying considerable space, thus affecting the energy density of the battery cell and increasing manufacturing costs.

[0038] like Figure 1 As 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.

[0039] 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.

[0040] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment includes: a housing 110, an electrode assembly 120, an end cap 130, a terminal post 140, and a conductive element 150.

[0041] Combination Figures 4 to 6As shown, the electrode assembly 120 is disposed within the housing 110; the end cap 130 is connected to the housing 110, and the end cap 130 has a mounting hole 131 extending along the first direction Z (i.e., the mounting hole 131 extends through the end cap 130 along the first direction Z); the electrode post 140 passes through the mounting hole 131, and the electrode post 140 includes a first electrode post body 141 and a second electrode post body 142 connected to each other. The first electrode post body 141 is located on the side of the second electrode post body 142 near the electrode assembly 120, and the side of the first electrode post body 141 away from the electrode assembly 120 has a groove 1411, which is recessed towards the direction of the electrode assembly 120. At least a portion of the second electrode post body 142 is located within the groove 1411; the conductive element 150 is disposed within the housing 110, and the conductive element 150 is electrically connected to the first electrode post body 141 and the electrode assembly 120 respectively. At least a portion of the conductive element 150 is located on the outer periphery of the first electrode post body 141.

[0042] It is understood that the battery cell 100 provided in this embodiment includes a first electrode body 141 and a second electrode body 142 connected to each other. The first electrode body 141 has a groove 1411 on the side away from the electrode assembly 120. The groove 1411 is recessed towards the electrode assembly 120. At least a portion of the second electrode body 142 is located in the groove 1411, that is, a part of the second electrode body 142 is accommodated in the groove 1411 or the entire second electrode body 142 is completely accommodated in the groove 1411. This can reduce the space occupied by the electrode 140 in its axial direction, thereby helping to improve space utilization. At the same time, since at least a portion of the conductive element 150 is located on the outer periphery of the first electrode body 141, that is, a part of the conductive element 150 is located on the outer periphery of the first electrode body 140 or the entire conductive element 150 is completely located on the outer periphery of the first electrode body 140, this can reduce the space occupied by the conductive element 150 in the axial direction of the electrode 140, thereby helping to further improve space utilization. This helps to increase the energy density of the battery cell 100.

[0043] Furthermore, by providing the groove 1411 in the first electrode body 141, the amount of material used in the first electrode body 141 can be reduced, thereby helping to reduce the manufacturing cost of the battery cell 100.

[0044] Furthermore, the electrode post 140, comprising a first electrode post body 141 and a second electrode post body 142 connected together, can be understood as being formed by combining the first electrode post body 141 and the second electrode post body 142. This helps reduce the manufacturing cost of the battery cell 100. Specifically, on the negative electrode side of the battery cell 100, the material of the second electrode post body 142 of the negative electrode post can be aluminum, and the material of the first electrode post body 141 of the negative electrode post can be copper. That is, it is not necessary to use copper entirely as the negative electrode post. The negative electrode post is formed by combining copper and aluminum. This satisfies the electrical connection requirements between the negative electrode post and the electrode assembly 120, and also saves copper usage, thereby reducing manufacturing costs.

[0045] like Figure 2 , Figure 6 and Figure 7 As shown, in some embodiments, the first electrode body 141 includes a body portion 1413 and a protrusion 1414. The protrusion 1414 is connected to the side of the body portion 1413 away from the electrode assembly 120, and the protrusion 1414 is inclined relative to the first direction Z. The protrusion 1414 is arranged around the second electrode body 142. The protrusion 1414 and the body portion 1413 form a groove 1411. The conductive member 150 is electrically connected to the body portion 1413, and at least a portion of the conductive member 150 is located on the outer periphery of the body portion 1413.

[0046] It should be noted that the protrusion 1414 and the body 1413 can be manufactured into a single structure using an integral molding process. Examples of integral molding processes include stamping, injection molding, die casting, extrusion, 3D printing, etc., and no specific limitations are made here.

[0047] like Figure 3 , Figure 6 and Figure 7 As shown, the conductive component 150 is further provided with a connecting hole 1511 that extends through the first direction Z (i.e., the connecting hole 1511 extends through the conductive component 150 along the first direction Z), and the body portion 1413 passes through the connecting hole 1511, with the outer peripheral side of the body portion 1413 connected to the hole wall of the connecting hole 1511.

[0048] It is understandable that since the conductive element 150 is provided with a connecting hole 1511 that extends through the first direction Z, and the body portion 1413 passes through the connecting hole 1511, this not only enables the conductive element 150 to be arranged around the body portion 1413, so that at least a part of the conductive element 150 is located on the outer periphery of the body portion 1413, thereby helping to improve space utilization, but also enables the electrical connection between the conductive element 150 and the first pole body 141 through the connection between the outer periphery of the body portion 1413 and the hole wall of the connecting hole 1511.

[0049] like Figure 2 , Figure 3 and Figure 6 As shown, further, the outer peripheral side of the first pole body 141 is welded to the hole wall of the connecting hole 1511 to form a weld 1512. The weld 1512 is located on the side of the conductive member 150 near the electrode assembly 120, and the weld 1512 is arranged around the body portion 1413.

[0050] It should be noted that when welding the first pole body 141 and the conductive element 150, a portion of the first pole body 141 and a portion of the conductive element 150 are fused together to form a weld 1512.

[0051] It is understandable that the electrical connection between the conductive element 150 and the first pole body 141 is achieved by welding. By providing a weld 1512 around the body portion 1413, the welding area between the conductive element 150 and the first pole body 141 can be increased, thereby helping to achieve a reliable electrical connection.

[0052] Of course, for the above embodiments, in addition to welding the outer peripheral side of the body part 1413 to the hole wall of the connecting hole 1511, the outer peripheral side of the body part 1413 can also be threaded, snapped, or bonded to the hole wall of the connecting hole 1511, all of which can achieve electrical connection. Here, no specific limitation is made on the electrical connection method between the conductive member 150 and the first pole body 141.

[0053] like Figure 2 , Figure 6 , Figure 7 and Figure 11 As shown, the conductive component 150 further includes a first conductive portion 151 and a second conductive portion 152 connected to each other. The first conductive portion 151 is provided with a connection hole 1511. The weld 1512 is located on the side of the first conductive portion 151 close to the electrode assembly 120. At least a portion of the second conductive portion 152 is located on the outer periphery of the first conductive portion 151. The second conductive portion 152 is electrically connected to the electrode assembly 120. The dimension T1 of the first conductive portion 151 along the first direction Z is greater than the dimension T2 of the second conductive portion 152 along the first direction Z, that is, T1 > T2.

[0054] It is understandable that by welding the first conductive portion 151, which has a relatively large dimension along the first direction Z, to the first electrode body 141, a greater weld penetration can be provided, thereby helping to improve the reliability of the electrical connection between the conductive element 150 and the first electrode body 141. By electrically connecting the second conductive portion 152, which has a relatively small dimension along the first direction Z, to the electrode assembly 120, the space occupied by the conductive element 150 can be reduced to increase energy density, and materials can be reduced to lower manufacturing costs.

[0055] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the battery cell 100 further includes a sealing member 160 disposed around the terminal post 140. The entire sealing member 160 is located within the mounting hole 131. The wall of the mounting hole 131 has a first inclined surface 132. The terminal post 140 has a second inclined surface 143. The second inclined surface 143 is formed by at least a portion of the outer peripheral side of the first protrusion 1414 and at least a portion of the outer peripheral side of the terminal post body 142. The body portion 1413 has a first surface 1412 disposed near the electrode assembly 120. The angle formed between the first inclined surface 132 and the first surface 1412 is a first obtuse angle α1, and the angle formed between the second inclined surface 143 and the first surface 1412 is a second obtuse angle α2. The sealing member 160 is respectively fitted to the first inclined surface 132 and the second inclined surface 143.

[0056] It should be noted that the angle α1 formed between the first inclined plane 132 and the first surface 1412 can be understood as the angle formed between the first inclined line formed by the intersection of the cutting plane and the first inclined plane 132 and the first surface 1412, for example... Figures 4 to 6 As shown, the angle α1 can be understood as the angle formed between the first oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction X and the first oblique surface 132 and the first surface 1412.

[0057] Similarly, the angle α2 formed between the second inclined plane 143 and the first surface 1412 can be understood as the angle formed between the second inclined line formed by the intersection of the cutting plane and the second inclined plane 143 and the first surface 1412, for example... Figures 4 to 6 As shown, the angle α2 can be understood as the angle formed between the second oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction X and the second oblique surface 143, and the first surface 1412.

[0058] It should be noted that an obtuse angle means: 90° < obtuse angle < 180°, such as 90.5°, 91°, 95°, 96°, 100°, 105°, 108°, 110°, 117°, 120°, 127°, 130°, 139°, 140°, 150°, 155°, 160°, 170°, etc. In other words, any value other than 90° and 180° can be selected from the range of 90° to 180°, without any specific limitation.

[0059] Understandably, since the entire seal 160 is located within the mounting hole 131, meaning the entire seal 160 is completely housed within the mounting hole 131, this simplifies the structure of the seal 160. Simultaneously, because the wall of the mounting hole 131 has a first inclined surface 132, and the angle formed between the first inclined surface 132 and the first surface 1412 is a first obtuse angle α1, and the terminal post 140 has a second inclined surface 143, and the angle formed between the second inclined surface 143 and the first surface 1412 is a second obtuse angle α2, the seal 160 is jointly limited and compressed by the first inclined surface 132 and the second inclined surface 143, further simplifying the structure of the terminal post 140. In this way, reliable sealing is achieved, and materials for the terminal post 140 and the seal 160 are saved, thereby reducing the manufacturing cost of the battery cell 100 and improving space utilization, thus increasing the energy density of the battery cell 100.

[0060] Furthermore, when the first pole body 141 is manufactured using a stamping process, the second inclined surface 143, which forms a second obtuse angle α2 with the first surface 1412, is more conducive to demolding, thereby reducing the processing difficulty.

[0061] It should be noted that the outer periphery of the body portion 1413 can be parallel to the first direction Z, thus forming an angle with the second inclined surface 143; of course, the outer periphery of the body portion 1413 can also be coplanar with and connected to the second inclined surface 143, without any specific limitation here.

[0062] like Figure 6 and Figure 8 As shown, further, the outer peripheral side of the seal 160 has a third inclined surface 161 that abuts against the first inclined surface 132. The angle formed between the third inclined surface 161 and the first surface 1412 is a third obtuse angle β1, which is equal to the first obtuse angle α1, i.e., α1=β1; and / or, the inner peripheral side of the seal 160 has a fourth inclined surface 162 that abuts against the second inclined surface 143. The angle formed between the fourth inclined surface 162 and the first surface 1412 is a fourth obtuse angle β2, which is equal to the second obtuse angle α2, i.e., α2=β2. In this way, the seal 160 can fit more tightly with the end cap 130 and the terminal post 140, which helps to increase the area of ​​tight contact between the seal 160 and the end cap 130 and the terminal post 140, thereby helping to improve the sealing performance of the battery cell 100.

[0063] It should be noted that the angle β1 formed between the third inclined plane 161 and the first surface 1412 can be understood as the angle formed between the third inclined line formed by the intersection of the cutting plane and the third inclined plane 161 and the first surface 1412, for example... Figures 4 to 6As shown, the angle β1 can be understood as the angle formed between the third oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction X and the third oblique surface 161, and the first surface 1412.

[0064] Similarly, the angle β2 formed between the fourth inclined plane 162 and the first surface 1412 can be understood as the angle formed between the fourth inclined line formed by the intersection of the cutting plane and the fourth inclined plane 162 and the first surface 1412, for example... Figures 4 to 6 As shown, the angle β2 can be understood as the angle formed between the fourth oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction X and the fourth oblique surface 162, and the first surface 1412.

[0065] like Figure 2 as well as Figures 6 to 8 As shown, the seal 160 further has a first end face 163 disposed near the electrode assembly 120, and at least a portion of the first end face 163 is disposed near the first surface 1412 on the side of the protrusion 1414 away from the electrode assembly 120 along the first direction Z.

[0066] Understandably, for the sake of convenience, we will use the following terms here: Figure 6 Taking the shown state as an example, "at least a portion of the first end face 163 is disposed near the first surface 1412 relative to the side of the protrusion 1414 away from the electrode assembly 120" can be understood as at least a portion of the first end face 163 being disposed below the side of the protrusion 1414 away from the electrode assembly 120. This can better prevent the electrolyte in the housing 110 from reaching the connection between the first electrode body 141 and the second electrode body 142, thereby reducing the risk of affecting the reliability of the electrode 140 due to the electrolyte damaging the connection.

[0067] like Figure 2 as well as Figures 6 to 8 As shown, further, the seal 160 has a second end face 164 disposed away from the first end face 163, and along the first direction Z, the second end face 164 is disposed near the first surface 1412 on the side of the protrusion 1414 away from the electrode assembly 120. Figure 6 For example, in the state shown, at least a portion of the second end face 164 is positioned below the side of the protrusion 1414 away from the electrode assembly 120, which can more effectively prevent the electrolyte from damaging the connection between the first electrode body 141 and the second electrode body 142.

[0068] like Figure 2 and Figure 6As shown, the battery cell 100 further includes a first insulating member 170 located within the housing 110. The first insulating member 170 is disposed around the first terminal body 141, and the first insulating member 170 is located on the side of the end cap 130 near the electrode assembly 120. The conductive member 150 is located on the side of the first insulating member 170 near the electrode assembly 120. The first insulating member 170 abuts against the second inclined surface 143 and the side of the sealing member 160 near the electrode assembly 120, respectively.

[0069] Understandably, since the first insulating element 170 is located on the side of the end cap 130 close to the electrode assembly 120, and the conductive element 150 is located on the side of the first insulating element 170 close to the electrode assembly 120, insulation is achieved between the conductive element 150 and the end cap 130, as well as between the terminal post 140 and the end cap 130, reducing the risk of short circuit in the battery cell 100.

[0070] Meanwhile, since the first insulating member 170 abuts against the second inclined surface 143 and the sealing member 160 on the side near the electrode assembly 120, the first inclined surface 132 and the second inclined surface 143 can better compress the sealing member 160 and restrict the sealing member 160 from moving towards the electrode assembly 120, thereby helping to further improve the sealing performance.

[0071] like Figure 6 As shown, in a specific embodiment, the two opposite sides of the first insulating member 170 along the first direction Z are both planes, which can be understood as the first insulating member 170 being straight. This helps to reduce the size of the first pole body 141 along the first direction Z, thereby helping to improve the energy density and reducing the material used in the first pole body 141 to reduce manufacturing costs.

[0072] Of course, in some other specific embodiments, a portion of the first insulating member 170 may be located within the mounting hole 131, and the first insulating member 170 may abut against the first inclined surface 132, the second inclined surface 143, and the side of the seal member 160 near the electrode assembly 120, respectively. This can provide more stable support for the seal member and better insulation.

[0073] like Figure 6 as well as Figures 9 to 11 As shown, the first insulating member 170 is provided with a first clearance groove 171 on the side away from the end cap 130, and at least a portion of the conductive member 150 is located in the first clearance groove 171.

[0074] Understandably, the first clearance groove 171 allows at least a portion of the conductive element 150 to be housed within the first insulating element 170, thereby reducing the space occupied by the conductive element 150 and the first insulating element 170 in the first direction Z, which helps to improve the energy density of the battery cell 100. Furthermore, the first clearance groove 171 also restricts the movement of the conductive element 150, helping to improve the reliability of the electrical connection between the conductive element 150 and the terminal post 140 and the electrode assembly 120.

[0075] like Figure 2 , Figure 6 and Figure 11 As shown, the end cap 130 further includes a second clearance groove 133 communicating with the mounting hole 131 on the side near the electrode assembly 120. The portion of the first insulator 170 with the first clearance groove 171 is located within the second clearance groove 133. This reduces the space occupied by the first insulator 170 and the end cap 130 in the first direction Z, thereby helping to further improve energy density. Furthermore, the second clearance groove 133 restricts the movement of the first insulator 170, helping to reduce the risk of insulation failure.

[0076] like Figure 3 , Figure 6 and Figure 11 As shown, the battery cell 100 further includes a second insulating member 180 surrounding the second terminal body 142. The second insulating member 180 includes a first insulating portion 181, at least a portion of which is located within the mounting hole 131. The first insulating portion 181 abuts against the first inclined surface 132, the second inclined surface 143, and the side of the seal 160 away from the electrode assembly 120. Thus, the first insulating portion 181, in conjunction with the first inclined surface 132 and the second inclined surface 143, can better compress the seal 160 and restrict the movement of the seal 160 away from the electrode assembly 120, thereby further improving sealing performance. Simultaneously, the first insulating portion 181 can increase the insulation performance between the terminal 140 and the end cap 130, reducing the risk of short circuits.

[0077] like Figure 2 , Figure 6 and Figure 11As shown, the second insulating member 180 further includes a second insulating part 182 connected to the first insulating part 181. The second insulating part 182 is disposed around the first insulating part 181. The second pole body 142 includes a main body part 1421 and a limiting part 1422 connected to each other. The main body part 1421 is located on the side of the limiting part 1422 near the electrode assembly 120. The main body part 1421 is connected to the main body part 1413 and the protrusion 1414 respectively. At least a portion of the main body part 1421 is located in the groove 1411. The second insulating part 182 is disposed between the limiting part 1422 and the end cap 130 along the first direction Z.

[0078] Understandably, when the electrode post 140 is subjected to an external force in the direction close to the electrode assembly 120, the second insulating portion 182 can support the limiting portion 1422 to restrict the electrode post 140 from moving in the direction close to the electrode assembly 120, thereby reducing the risk of electrical connection failure and sealing failure due to the electrode post 140 detaching from the end cap 130. Simultaneously, the provision of the second insulating portion 182 enables insulation between the limiting portion 1422 and the end cap 130, reducing the risk of short circuits.

[0079] like Figure 2 , Figure 6 and Figure 11 As shown, the end cap 130 further includes a cover plate 134 and a flange 135. The cover plate 134 is connected to the housing 110 and the flange 135 respectively. The flange 135 protrudes from the side of the cover plate 134 away from the electrode assembly 120. The flange 135 is inclined relative to the first direction Z. The mounting hole 131 passes through the cover plate 134 and the flange 135 along the first direction Z. The second insulating part 182 is disposed between the limiting part 1422 and the flange 135 along the first direction Z.

[0080] Understandably, the flange 135 helps to increase the contact area between the first bevel 132 and the seal 160, thereby improving sealing reliability. The second insulating portion 182 enables insulation between the limiting portion 1422 and the flange 135.

[0081] like Figures 12 to 14 As shown, the outer periphery of the flange 135 further has a fifth inclined surface 1351, which is connected to the cover plate 134. The angle formed between the fifth inclined surface 1351 and the first surface 1412 is an acute angle γ.

[0082] It should be noted that an acute angle γ means: 0° < γ < 90°, such as 0.5°, 5°, 10°, 15°, 20°, 25°, 30°, 34°, 35°, 40°, 45°, 60°, 80°, 88°, 89°, etc. In other words, any value other than 0° and 90° can be selected from the range of 0° to 90°, without any specific limitation.

[0083] It is understandable that the fifth inclined surface 1351 forms an acute angle γ with the first surface 1412, which helps to improve the structural strength of the flange 135. Thus, when the pole post 140 is subjected to an external force in the direction close to the electrode assembly 120, the flange 135 can provide more support for the limiting part 1422, thereby reducing the risk of the pole post 140 falling off.

[0084] like Figure 6 and Figure 14 As shown, the second insulating member 180 further includes a third insulating portion 183 connected to the second insulating portion 182. The third insulating portion 183 is disposed around the flange 135 and is connected to the fifth inclined surface 1351 and the cover plate 134 respectively. In this way, the insulation distance between the terminal post 140 and the end cap 130 can be extended by the third insulating portion 183, so as to effectively increase the insulation performance and thus help reduce the risk of short circuit in the battery cell 100.

[0085] like Figure 2 , Figure 6 and Figure 14 As shown, the second insulating member 180 further includes a fourth insulating member 184 connected to the second insulating member 182. The fourth insulating member 184 is located on the side of the second insulating member 182 away from the electrode assembly 120, and the fourth insulating member 184 covers the outer periphery of the limiting member 1422.

[0086] It is understandable that since the fourth insulating part 184 covers the outer peripheral side of the limiting part 1422, it can be understood that the fourth insulating part 184 is connected to the outer peripheral side of the limiting part 1422, and the fourth insulating part 184 blocks at least part of the outer peripheral side of the limiting part 1422 in a direction perpendicular to the first direction Z. This can increase the creepage distance between the limiting part 1422 and the end cover 130, thereby reducing the risk of short circuit.

[0087] like Figure 6 As shown, furthermore, the first obtuse angle α1 and the second obtuse angle α2 are equal, that is, α1=α2. This makes the forces on the inner and outer circumferential sides of the seal 160 more balanced, which helps to improve the sealing reliability of the seal 160.

[0088] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments, the battery cell 100 is applied to a battery pack having a busbar for electrical connection between different battery cells 100, and the second terminal body 142 has a second surface 1423 disposed away from the electrode assembly 120, the second surface 1423 being welded to the busbar to achieve electrical connection between the terminal 140 and the busbar.

[0089] It should be noted that the materials selected for the battery cell 100 provided in this embodiment are as follows: For example, the material of the end cap 130 / the material of the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here.

[0090] For example, the material of the conductive element 150 / the material of the electrode 140 can be a metallic conductive material (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or a non-metallic conductive material (e.g., carbon-based material, superconductor, semiconductor, etc.), without specific limitations.

[0091] For example, on the negative electrode side of the battery cell 100, when the negative electrode post includes a first electrode post body 141 and a second electrode post body 142, the materials of the conductive element 150 and the first electrode post body 141 can be copper, and the materials of the second electrode post body 142 and the busbar can be aluminum; as another example, on the positive electrode side of the battery cell 100, the materials of the conductive element 150, the positive electrode post, and the busbar can all be aluminum.

[0092] For example, the materials of the first insulating element 170 and the second insulating element 180 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubber (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.

[0093] For example, the material of the seal 160 can be nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations.

[0094] 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; 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.; according to the type of metal ions, the battery cell 100 provided in this embodiment can be a lithium-ion battery, a sodium-ion battery, etc.

[0095] 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 (electrolyte). Exemplarily, the electrode post 140 may include a positive electrode post and a negative electrode post. The electrode assembly 120 may be manufactured using a winding process or a stacking process. The electrode assembly 120 may include an electrode body and electrode tabs. The electrode tabs include 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 electrically connected 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 electrically connected 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.

[0096] 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.

[0097] It should be noted that when the battery cell 100 provided in this embodiment has a first direction Z, a second direction X and a third direction Y that are perpendicular to each other, the positive electrode tab and the negative electrode tab are both located on the side of the electrode body near the end cap 130, and the positive electrode post and the negative electrode post are arranged at intervals along the second direction X. When there are multiple electrode assemblies 120, the multiple electrode assemblies 120 are arranged along the third direction Y.

[0098] 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.

[0099] 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.

[0100] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, 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.

[0101] 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, Having a first orientation (Z), the battery cell includes: Casing (110); An electrode assembly (120) is disposed within the housing (110); End cap (130) is connected to the housing (110), and the end cap (130) is provided with a mounting hole (131) extending through the first direction (Z). An electrode post (140) is inserted through the mounting hole (131). The electrode post (140) includes a first electrode post body (141) and a second electrode post body (142) connected to each other. The first electrode post body (141) is located on the side of the second electrode post body (142) closer to the electrode assembly (120). A groove (1411) is provided on the side of the first electrode post body (141) away from the electrode assembly (120). The groove (1411) is recessed in the direction closer to the electrode assembly (120). At least a portion of the second electrode post body (142) is located in the groove (1411). A conductive element (150) is disposed inside the housing (110). The conductive element (150) is electrically connected to the first pole body (141) and the electrode assembly (120) respectively. At least a portion of the conductive element (150) is located on the outer periphery of the first pole body (141).

2. The battery cell according to claim 1, characterized in that, The first electrode body (141) includes a body portion (1413) and a protrusion (1414). The protrusion (1414) is connected to the side of the body portion (1413) away from the electrode assembly (120) and is inclined relative to the first direction (Z). The protrusion (1414) surrounds the second electrode body (142). The protrusion (1414) and the body portion (1413) enclose to form the groove (1411). The conductive element (150) is electrically connected to the body portion (1413). At least a portion of the conductive element (150) is located on the outer periphery of the body portion (1413).

3. The battery cell according to claim 2, characterized in that, The conductive element (150) is provided with a connecting hole (1511) extending along the first direction (Z), and the body part (1413) is provided through the connecting hole (1511). The outer peripheral side of the body part (1413) is connected to the hole wall of the connecting hole (1511).

4. The battery cell according to claim 3, characterized in that, The outer periphery of the first pole body (141) is welded to the hole wall of the connecting hole (1511) to form a weld (1512). The weld (1512) is located on the side of the conductive element (150) near the electrode assembly (120) and is arranged around the body part (1413).

5. The battery cell according to claim 4, characterized in that, The conductive element (150) includes a first conductive part (151) and a second conductive part (152) connected to each other. The first conductive part (151) is provided with the connection hole (1511). The weld (1512) is located on the side of the first conductive part (151) close to the electrode assembly (120). At least a portion of the second conductive part (152) is located on the outer periphery of the first conductive part (151). The second conductive part (152) is electrically connected to the electrode assembly (120). The dimension of the first conductive part (151) along the first direction (Z) is greater than the dimension of the second conductive part (152) along the first direction (Z).

6. The battery cell according to claim 2, characterized in that, The battery cell also includes a sealing element (160) surrounding the terminal post (140), the entire sealing element (160) being located within the mounting hole (131), the wall of the mounting hole (131) having a first inclined surface (132), the terminal post (140) having a second inclined surface (143), the second inclined surface (143) being formed by at least a portion of the outer peripheral side of the protrusion (1414) and at least a portion of the outer peripheral side of the second terminal post body (142), the body portion (1413) having a first surface (1412) disposed near the electrode assembly (120), the angle formed between the first inclined surface (132) and the first surface (1412) being a first obtuse angle, the angle formed between the second inclined surface (143) and the first surface (1412) being a second obtuse angle, and the sealing element (160) being fitted to the first inclined surface (132) and the second inclined surface (143) respectively.

7. The battery cell according to claim 6, characterized in that, The outer periphery of the seal (160) has a third inclined surface (161) that abuts against the first inclined surface (132), and the angle formed between the third inclined surface (161) and the first surface (1412) is a third obtuse angle, which is equal to the first obtuse angle; and / or, the inner periphery of the seal (160) has a fourth inclined surface (162) that abuts against the second inclined surface (143), and the angle formed between the fourth inclined surface (162) and the first surface (1412) is a fourth obtuse angle, which is equal to the second obtuse angle.

8. The battery cell according to claim 6, characterized in that, The seal (160) has a first end face (163) disposed near the electrode assembly (120), and at least a portion of the first end face (163) is disposed near the first surface (1412) on the side of the first end face (163) away from the electrode assembly (120) relative to the protrusion (1414).

9. The battery cell according to claim 8, characterized in that, The seal (160) has a second end face (164) disposed away from the first end face (163), and along the first direction (Z), the second end face (164) is disposed close to the first surface (1412) on the side of the protrusion (1414) away from the electrode assembly (120).

10. The battery cell according to claim 6, characterized in that, The battery cell also includes a first insulating member (170) located within the housing (110). The first insulating member (170) is disposed around the first electrode body (141) and is located on the side of the end cap (130) near the electrode assembly (120). The conductive member (150) is located on the side of the first insulating member (170) near the electrode assembly (120). The first insulating member (170) abuts against the second inclined surface (143) and the side of the sealing member (160) near the electrode assembly (120), respectively.

11. The battery cell according to claim 10, characterized in that, The first insulating member (170) has two opposite sides that are planar along the first direction (Z).

12. The battery cell according to claim 10, characterized in that, The first insulating member (170) has a first clearance groove (171) on the side away from the end cap (130), and at least a portion of the conductive member (150) is located in the first clearance groove (171).

13. The battery cell according to claim 12, characterized in that, The end cap (130) has a second clearance groove (133) on the side near the electrode assembly (120) that communicates with the mounting hole (131), and the portion of the first insulating member (170) with the first clearance groove (171) is located in the second clearance groove (133).

14. The battery cell according to claim 6, characterized in that, The battery cell further includes a second insulating member (180) disposed around the second electrode post body (142). The second insulating member (180) includes a first insulating portion (181), at least a portion of which is located within the mounting hole (131). The first insulating portion (181) abuts against the side of the first inclined surface (132), the second inclined surface (143), and the seal (160) away from the electrode assembly (120).

15. The battery cell according to claim 14, characterized in that, The second insulating member (180) further includes a second insulating part (182) connected to the first insulating part (181), the second insulating part (182) being disposed around the first insulating part (181), the second pole body (142) including a main body part (1421) and a limiting part (1422) connected to each other, the main body part (1421) being located on the side of the limiting part (1422) near the electrode assembly (120), and being connected to the main body part (1413) and the protrusion (1414) respectively, at least a portion of the main body part (1421) being located in the groove (1411), and the second insulating part (182) being disposed between the limiting part (1422) and the end cap (130) along the first direction (Z).

16. The battery cell according to claim 15, characterized in that, The end cap (130) includes a cover plate (134) and a flange (135). The cover plate (134) is connected to the housing (110) and the flange (135) respectively. The flange (135) protrudes from the side of the cover plate (134) away from the electrode assembly (120). The flange (135) is inclined relative to the first direction (Z). The mounting hole (131) passes through the cover plate (134) and the flange (135) along the first direction (Z). The second insulating part (182) is disposed between the limiting part (1422) and the flange (135) along the first direction (Z).

17. The battery cell according to claim 16, characterized in that, The outer periphery of the flange (135) has a fifth inclined surface (1351), which is connected to the cover plate (134). The angle formed between the fifth inclined surface (1351) and the first surface (1412) is an acute angle.

18. The battery cell according to claim 17, characterized in that, The second insulating member (180) also includes a third insulating part (183) connected to the second insulating part (182), the third insulating part (183) being disposed around the flange (135) and connected to the fifth inclined surface (1351) and the cover plate (134) respectively.

19. The battery cell according to claim 16, characterized in that, The second insulating member (180) further includes a fourth insulating part (184) connected to the second insulating part (182), the fourth insulating part (184) being located on the side of the second insulating part (182) away from the electrode assembly (120), and the fourth insulating part (184) covering the outer periphery of the limiting part (1422).

20. The battery cell according to claim 6, characterized in that, The first obtuse angle and the second obtuse angle are equal.

21. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 20.

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