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 entire sealing element is located in the mounting hole of the end cover, that is, the entire sealing element is completely accommodated in the mounting hole, which helps to simplify the structure of the sealing element. Meanwhile, the hole wall of the mounting hole has a first inclined surface, the included angle between the first inclined surface and the first surface of the pole post close to the electrode assembly is a first acute angle, the outer circumferential side of the pole post has a second inclined surface, the included angle between the second inclined surface and the first surface is a second acute angle, the first insulating element is arranged around the pole post and connected to the side of the first end surface of the sealing element close to the electrode assembly, so as to realize the common limiting and compression of the sealing element by the first inclined surface, the second inclined surface and the first insulating element, which helps to simplify the structure of the pole post. In this way, reliable sealing can be realized, the material of the pole post and the sealing element can be saved, and thus the manufacturing cost of the battery monomer can be reduced and the energy density of the battery monomer can be improved.

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] In related technologies, the sealing component of a battery cell includes two parts: a first sealing part and a second sealing part. The first sealing part is located inside the mounting hole of the end cap, and the second sealing part is located on the side of the end cap closer to the electrode assembly. The electrode post has a support part extending radially therefrom, and the support part is located on the side of the second sealing part away from the end cap. Thus, reliable sealing is achieved by the end cap and the support part jointly compressing the second sealing part. However, the presence of the second sealing part and the support part will occupy a large space, thereby 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 of how to achieve reliable sealing and improve energy density.

[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 direction. The battery cell includes: a housing; an electrode assembly disposed within the housing; an end cap connected to the housing and having a mounting hole extending through the housing along the first direction, the wall of the mounting hole having a first inclined surface; a terminal post passing through the mounting hole and insulated from the end cap, the terminal post being electrically connected to the electrode assembly, the outer periphery of the terminal post having a second inclined surface, the terminal post having a first surface disposed near the electrode assembly, the angle between the first inclined surface and the first surface being a first acute angle, and the angle between the second inclined surface and the first surface being a second acute angle; a sealing member surrounding the terminal post and having a first end face disposed near the electrode assembly, the entire sealing member being located within the mounting hole, the sealing member being sealed to the first inclined surface and the second inclined surface respectively; and a first insulating member surrounding the terminal post, at least a portion of the first insulating member being located within the housing, the first insulating member being connected to the side of the first end face near the electrode assembly.

[0006] 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 third inclined surface forming a third acute angle with the first surface, the third acute angle being equal to the first acute angle.

[0007] In some embodiments of the first aspect, the inner circumferential side of the seal has a fourth inclined surface that abuts against the second inclined surface, the fourth inclined surface forming a fourth acute angle with the first surface, the fourth acute angle being equal to the second acute angle.

[0008] In some embodiments of the first aspect, the first insulating member includes a first insulating portion and a second insulating portion connected together, the first insulating portion being located on the side of the end cap near the electrode assembly, the second insulating portion being protruding from the side of the first insulating portion away from the electrode assembly, and the second insulating portion being inclined relative to the first direction, at least a portion of the second insulating portion being located within the mounting hole, and the second insulating portion abutting against the first inclined surface, the second inclined surface and the first end face respectively.

[0009] In some embodiments of the first aspect, a first notch is provided on the outer peripheral side of the second insulating portion, and the first notch is located on the side of the second insulating portion near the first end face.

[0010] In some embodiments of the first aspect, the pole post includes a main body portion and a limiting portion connected together, the main body portion being located on the side of the limiting portion closer to the electrode assembly and electrically connected to the electrode assembly, the limiting portion being disposed on the side of the end cap away from the electrode assembly, and the outer peripheral side of the main body portion having a second inclined surface.

[0011] In some embodiments of the first aspect, the electrode post includes a first electrode post portion and a second electrode post portion connected to each other, the first electrode post portion being located on the side of the second electrode post portion closer to the electrode assembly and electrically connected to the electrode assembly, the main body portion being composed of the portion of the second electrode post portion closer to the electrode assembly and the first electrode post portion, and the limiting portion being composed of the portion of the second electrode post portion away from the electrode assembly.

[0012] In some embodiments of the first aspect, along the first direction, the orthographic projection of the first inclined surface on the electrode assembly and the orthographic projection of the first pole portion on the electrode assembly at least partially overlap.

[0013] In some embodiments of the first aspect, along the first direction, the orthographic projection of the first inclined surface on the electrode assembly and the orthographic projection of the second pole portion on the electrode assembly at least partially overlap.

[0014] In some embodiments of the first aspect, the pole post has a composite interface formed by connecting the first pole post portion and the second pole post portion, and along the first direction, at least a portion of the first end face is disposed close to the first surface relative to the composite interface.

[0015] In some embodiments of the first aspect, the battery cell further includes a second insulating member disposed around the terminal post, the second insulating member including a third insulating portion disposed between the limiting portion and the end cap along the first direction.

[0016] In some embodiments of the first aspect, the seal has a second end face disposed away from the electrode assembly, and the second insulating member further includes a fourth insulating portion connected to the third insulating portion, the fourth insulating portion protruding from the side of the third insulating portion near the electrode assembly, the fourth insulating portion being inclined relative to the first direction, at least a portion of the fourth insulating portion being located within the mounting hole, and the fourth insulating portion abutting against the side of the second end face away from the electrode assembly, the first inclined surface, and the second inclined surface, respectively.

[0017] In some embodiments of the first aspect, a second notch is provided on the outer peripheral side of the fourth insulating portion, the second notch being located on the side of the fourth insulating portion near the second end face.

[0018] 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 mounting hole penetrating the cover plate and the flange along the first direction, at least a portion of 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 flange surrounding the fourth insulating portion, and the third insulating portion being disposed between the limiting portion and the flange along the first direction.

[0019] 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 side of the cover plate away from the electrode assembly, and the angle between the fifth inclined surface and the first inclined surface is a fifth acute angle.

[0020] In some embodiments of the first aspect, the second insulating member further includes a fifth insulating portion connected to the third insulating portion, the fifth insulating portion being disposed around the flange and connected to the fifth inclined surface.

[0021] In some embodiments of the first aspect, the second insulating member further includes a sixth insulating portion connected to the fifth insulating portion, the sixth insulating portion being disposed around the fifth insulating portion, and the battery cell further includes an insulating layer connected to the side of the cover plate away from the electrode assembly and overlapping the sixth insulating portion.

[0022] In some embodiments of the first aspect, the cover plate has a clearance groove on the side away from the electrode assembly, the entire sixth insulating portion is located within the clearance groove, and the insulating layer is located on the side of the sixth insulating portion away from the electrode assembly.

[0023] In some embodiments of the first aspect, the flange includes a first flange portion and a second flange portion, the first flange portion being connected to the cover plate and the second flange portion respectively, the first flange portion being inclined relative to the first direction, the second flange portion being bent relative to the first flange portion in a direction away from the limiting portion, and the third insulating portion being disposed between the limiting portion and the second flange portion along the first direction.

[0024] In some embodiments of the first aspect, the inner peripheral side of the flange has a first arc surface, and the first arc surface is located on the side of the flange away from the electrode assembly. The first arc surface is smoothly connected to the first inclined surface and is connected to the third insulating portion and the fourth insulating portion, respectively.

[0025] In some embodiments of the first aspect, the outer peripheral side of the main body has a second arc surface, which is smoothly connected to the second inclined surface and the side of the limiting portion near the electrode assembly, respectively, and the second arc surface is connected to the third insulating portion and the fourth insulating portion, respectively.

[0026] In some embodiments of the first aspect, the second insulating member further includes a seventh insulating portion connected to the third insulating portion, the seventh insulating portion protruding from the third insulating portion on the side away from the electrode assembly, and the seventh insulating portion covering the outer peripheral side of the limiting portion.

[0027] In some embodiments of the first aspect, the first acute angle and the second acute angle are equal.

[0028] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0029] The beneficial effects of this application are as follows: In the battery cell provided in this application, since the entire sealing element is located within the mounting hole of the end cap, meaning the entire sealing element is completely housed within the mounting hole, the sealing element does not require the second sealing portion found in related technologies, thus simplifying its structure. Simultaneously, because the wall of the mounting hole has a first inclined surface, the angle between the first inclined surface and the first surface of the electrode post near the electrode assembly is a first acute angle. The outer periphery of the electrode post has a second inclined surface, the angle between the second inclined surface and the first surface is a second acute angle. The first insulating member surrounds the electrode post and is connected to the first end face of the sealing element near the electrode assembly. This allows the sealing element to be confined and compressed by the first inclined surface, the second inclined surface, and the first insulating member. Therefore, the electrode post does not require the radially extending support portion found in related technologies, further simplifying its structure. Thus, reliable sealing is achieved, and materials for the electrode post and sealing element are saved, thereby reducing the manufacturing cost of the battery cell and improving space utilization, ultimately increasing the energy density of the battery cell.

[0030] 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

[0031] 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.

[0032] 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 5 Enlarged structural diagram of region D Figure 1 ; Figure 8 It shows Figure 7 A cross-sectional view of the central sealing element; Figure 9 It shows Figure 5 Enlarged structural diagram of region D Figure 2 ; Figure 10 This application shows a three-dimensional structural diagram of a battery cell with its housing and electrode assembly hidden in some other embodiments. Figure 11 It shows Figure 10 Schematic diagram of the cross-sectional structure at the middle EE; Figure 12 It shows Figure 11 A magnified structural diagram of region F in the middle; Figure 13 This application shows a three-dimensional structural diagram of a battery cell with its housing, electrode assembly, and conductive components hidden in some other embodiments. Figure 14 It shows Figure 13 Schematic diagram of the cross-sectional structure at the middle GG point; Figure 15 It shows Figure 14 A magnified structural diagram of region H in the middle.

[0033] Explanation of key component symbols: 100 - Battery cell; 110 - Housing; 120 - Electrode assembly; 130 - End cap; 131 - Mounting hole; 132 - First bevel; 133 - Cover plate; 1331 - Clearance groove; 134 - Flanged edge; 1341 - Fifth bevel; 1342 - First flange portion; 1343 - Second flange portion; 1344 - First arc surface; 140 - Terminal post; 141 - Second bevel; 142 - First terminal post portion; 1421 - First surface; 143 - Second terminal post portion; 1431 - Second surface; 144 - Composite interface; 145 - Main body portion; 146 - Limiting portion; 14 7-Second arc surface; 150-Seal; 151-Third inclined surface; 152-Fourth inclined surface; 153-First end face; 154-Second end face; 160-First insulating element; 161-First insulating part; 162-Second insulating part; 1621-First notch; 170-Second insulating element; 171-Fourth insulating part; 1711-Second notch; 172-Third insulating part; 173-Seventh insulating part; 174-Fifth insulating part; 175-Sixth insulating part; 180-Insulating layer; 190-Conductive element; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The battery cell is a crucial component of the battery pack. In related technologies, the sealing element of the battery cell comprises two parts: a first sealing part and a second sealing part. The first sealing part is located within the mounting hole of the end cap, and the second sealing part is located on the side of the end cap closer to the electrode assembly. The terminal post has a support portion extending radially thereafter (radial refers to the direction perpendicular to the centerline of the terminal post, i.e.,...). Figure 1 The support portion is located on the side of the second sealing portion away from the end cap (perpendicular to the first direction Z), thereby achieving a reliable seal by the joint compression of the second sealing portion by the end cap and the support portion; however, the presence of the second sealing portion and the support portion will occupy a large space, thus affecting the energy density of the battery cell.

[0042] 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.

[0043] 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.

[0044] 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, a sealing element 150, and a first insulating element 160.

[0045] Combination Figures 4 to 6 As 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), and the wall of the mounting hole 131 has a first inclined surface 132. The electrode post 140 passes through the mounting hole 131, and the electrode post 140 is insulated from the end cap 130. The electrode post 140 is electrically connected to the electrode assembly 120, and the outer peripheral side of the electrode post 140 has a second inclined surface 141. The electrode post 140 has a first surface 1421 disposed near the electrode assembly 120, the angle between the first inclined surface 132 and the first surface 1421 is a first acute angle α1, and the angle between the second inclined surface 141 and the first surface 1421 is a second acute angle α2; the sealing member 150 ring The electrode post 140 is disposed around the sealing member 150, and the sealing member 150 has a first end face 153 disposed near the electrode assembly 120. The entire sealing member 150 is located within the mounting hole 131, and the sealing member 150 is sealed to the first inclined surface 132 and the second inclined surface 141 respectively. The first insulating member 160 is disposed around the electrode post 140, and at least a portion of the first insulating member 160 is located within the housing 110. The first insulating member 160 is connected to the side of the first end face 153 near the electrode assembly 120.

[0046] It should be noted that the angle α1 between the first inclined plane 132 and the first surface 1421 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 1421, for example... Figures 4 to 6As shown, the included 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 1421.

[0047] Similarly, the angle α2 between the second inclined plane 141 and the first surface 1421 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 141 and the first surface 1421, for example... Figures 4 to 6 As shown, the included 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 141, and the first surface 1421.

[0048] It should be noted that an acute angle means: 0° < angle < 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.

[0049] It should be noted that "the sealing element 150 is sealed and connected to the first inclined surface 132 and the second inclined surface 141 respectively" can be understood as: the outer peripheral side of the sealing element 150 is connected to the first inclined surface 132 to form a seal, and the inner peripheral side of the sealing element 150 is connected to the second inclined surface 141 to form a seal.

[0050] It is understood that in the battery cell 100 provided in this embodiment, since the entire sealing element 150 is located within the mounting hole 131 of the end cap 130, that is, the entire sealing element 150 is completely contained within the mounting hole 131, the sealing element 150 does not need to be provided with the second sealing part in the related technology, thereby helping to simplify the structure of the sealing element 150; at the same time, since the hole wall of the mounting hole 131 has a first inclined surface 132, and the angle between the first inclined surface 132 and the first surface 1421 of the electrode post 140 near the electrode assembly 120 is a first acute angle α1, the electrode post The outer periphery of 140 has a second inclined surface 141, and the angle between the second inclined surface 141 and the first surface 1421 is a second acute angle α2. The first insulating member 160 is arranged around the pole post 140 and is connected to the first end face 153 of the seal 150 near the electrode assembly 120. This allows the first inclined surface 132, the second inclined surface 141 and the first insulating member 160 to jointly limit and compress the seal 150. In this way, the pole post 140 does not need to be provided with a support portion extending radially along it in the related art, which helps to simplify the structure of the pole post 140.

[0051] In this way, reliable sealing can be achieved, and the materials used for the terminal post 140 and the seal 150 can be saved, thereby helping to reduce the manufacturing cost of the battery cell 100 and improve space utilization, thus increasing the energy density of the battery cell 100.

[0052] like Figure 6 and Figure 8 As shown, in some embodiments, the outer periphery of the seal 150 has a third inclined surface 151 that abuts against the first inclined surface 132. The angle between the third inclined surface 151 and the first surface 1421 is a third acute angle β1, which is equal to the first acute angle α1, i.e., α1 = β1. This allows the seal 150 to fit more tightly with the end cap 130, helping to increase the area of ​​close contact between the seal 150 and the end cap 130, thereby helping to improve the sealing performance of the battery cell 100.

[0053] It should be noted that the angle β1 between the third inclined plane 151 and the first surface 1421 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 151 and the first surface 1421, for example... Figures 4 to 6 As shown, the included 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 151, and the first surface 1421.

[0054] like Figure 6 and Figure 8 As shown, in some embodiments, the inner circumferential side of the seal 150 has a fourth inclined surface 152 that abuts against the second inclined surface 141. The angle between the fourth inclined surface 152 and the first surface 1421 is a fourth acute angle β2, which is equal to the second acute angle α2, i.e., α2 = β2. This allows the seal 150 to fit more tightly with the terminal post 140, helping to increase the area of ​​close contact between the seal 150 and the terminal post 140, thereby helping to improve the sealing performance of the battery cell 100.

[0055] It should be noted that the angle β2 between the fourth inclined plane 152 and the first surface 1421 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 152 and the first surface 1421, for example... Figures 4 to 6 As shown, the included 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 152, and the first surface 1421.

[0056] like Figure 2 , Figure 6 and Figure 7As shown, in some embodiments, the first insulating member 160 includes a first insulating portion 161 and a second insulating portion 162 connected to each other. The first insulating portion 161 is located on the side of the end cap 130 near the electrode assembly 120. The second insulating portion 162 protrudes from the side of the first insulating portion 161 away from the electrode assembly 120 and is inclined relative to the first direction Z. At least a portion of the second insulating portion 162 is located in the mounting hole 131 and abuts against the first inclined surface 132, the second inclined surface 141 and the first end face 153 respectively.

[0057] Understandably, without the need for a radially extending support portion as in related technologies, the second insulating portion 162 of the first insulating member 160 abuts against the first end face 153 of the seal 150 near the electrode assembly 120, thereby restricting the movement of the seal 150 toward the electrode assembly 120, thus enhancing the stability of the seal 150. Furthermore, it can work together with the first inclined surface 132 and the second inclined surface 141 to limit and compress the seal 150, thereby helping to improve the sealing reliability of the seal 150.

[0058] like Figure 7 As shown, the second insulating portion 162 is further provided with a first notch 1621 on its outer peripheral side, and the first notch 1621 is located on the side of the second insulating portion 162 near the first end face 153.

[0059] It is understandable that by setting the first notch 1621, the second insulating part 162 can be chamfered or rounded, thereby guiding the second insulating part 162 into the mounting hole 131 during the installation of the first insulating part 160, thus reducing the installation difficulty of the first insulating part 160; at the same time, the first notch 1621 also provides clearance space for the compression deformation of the seal 150, which helps to improve the sealing reliability.

[0060] like Figures 10 to 12 As shown, in some embodiments, the electrode post 140 includes a main body portion 145 and a limiting portion 146 connected to each other. The main body portion 145 is located on the side of the limiting portion 146 close to the electrode assembly 120 and is electrically connected to the electrode assembly 120. The limiting portion 146 is disposed on the side of the end cap 130 away from the electrode assembly 120. The outer peripheral side of the main body portion 145 has a second inclined surface 141.

[0061] It is understandable that the limiting part 146 can restrict the pole post 140 from moving towards the electrode assembly 120 under the action of external force, thereby improving the stability of the pole post 140 and thus helping to improve the reliability of the electrical connection between the pole post 140 and the electrode assembly 120 and the sealing reliability of the seal 150.

[0062] like Figure 5, Figure 7 and Figure 12 As shown, the electrode post 140 further includes a first electrode post portion 142 and a second electrode post portion 143 connected to each other. The first electrode post portion 142 is located on the side of the second electrode post portion 143 near the electrode assembly 120, and the first electrode post portion 142 is electrically connected to the electrode assembly 120. The main body portion 145 is composed of the portion of the second electrode post portion 143 near the electrode assembly 120 and the first electrode post portion 142. The limiting portion 146 is composed of the portion of the second electrode post portion 143 away from the electrode assembly 120.

[0063] It should be noted that "the main body 145 is composed of the portion of the second pole post 143 near the electrode assembly 120 and the first pole post 142, and the limiting portion 146 is composed of the portion of the second pole post 143 away from the electrode assembly 120" can be understood as follows: the second pole post 143 has a portion near the electrode assembly 120 and a portion away from the electrode assembly 120, one of which together with the first pole post 142 constitutes the main body 145, and the other of which constitutes the limiting portion 146.

[0064] It is understandable that the first electrode post 142 and the second electrode post 143 can be made of different materials, thereby reducing 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 143 of the negative electrode post can be aluminum, and the material of the first electrode post 142 of the negative electrode post can be copper. That is, it is not necessary to use copper as the negative electrode post entirely. The negative electrode post can be formed by a combination of copper and aluminum. This can meet the electrical connection requirements between the negative electrode post and the electrode assembly 120, and also save the use of copper, thereby reducing the manufacturing cost.

[0065] like Figure 6 and Figure 7 As shown, further, along the first direction Z, the orthographic projection of the first inclined surface 132 on the electrode assembly 120 and the orthographic projection of the first pole piece 142 on the electrode assembly 120 at least partially overlap. Thus, when the pole piece 140 is subjected to an external force in a direction away from the electrode assembly 120, the first inclined surface 132 can provide a reaction force to the first pole piece 142 through the seal 150. This reaction force can offset part of the external force, thereby reducing the stress at the connection between the first pole piece 142 and the second pole piece 143 (i.e., the composite interface 144), and thus helping to improve the reliability of the pole piece 140.

[0066] like Figure 6 and Figure 7As shown, further, along the first direction Z, the orthographic projection of the first inclined surface 132 on the electrode assembly 120 and the orthographic projection of the second electrode post 143 on the electrode assembly 120 at least partially overlap. Thus, when the electrode post 140 is subjected to an external force in a direction away from the electrode assembly 120, the first inclined surface 132 can provide a reaction force to the second electrode post 143 through the seal 150. This reaction force can offset part of the external force, thereby reducing the stress at the connection point (i.e., the composite interface 144) between the first electrode post 142 and the second electrode post 143, and thus helping to improve the reliability of the electrode post 140.

[0067] like Figures 5 to 7 As shown, the pole post 140 further has a composite interface 144 formed by connecting the first pole post portion 142 and the second pole post portion 143, and at least a portion of the first end face 153 is disposed close to the first surface 1421 relative to the composite interface 144 along the first direction Z.

[0068] Understandably, for the sake of convenience, we will use the following terms here: Figure 6 and Figure 7 Taking the shown state as an example, "at least a portion of the first end face 153 is set close to the first surface 1421 relative to the composite interface 144" can be understood as at least a portion of the first end face 153 being set below the composite interface 144. This can better prevent the electrolyte in the housing 110 from reaching the composite interface 144, thereby reducing the risk of affecting the reliability of the electrode post 140 due to the electrolyte damaging the composite interface 144.

[0069] like Figures 5 to 7 As shown, further, the seal 150 has a second end face 154 disposed away from the electrode assembly 120, at least a portion of the second end face 154 being disposed close to the first surface 1421 relative to the composite interface 144, so as to Figure 6 and Figure 7 For example, in the state shown, at least a portion of the second end face 154 is set below the composite interface 144, which can more effectively prevent the electrolyte from damaging the composite interface 144.

[0070] like Figure 3 , Figure 6 and Figure 7As shown, the battery cell 100 further includes a second insulating member 170 surrounding the terminal post 140. The second insulating member 170 includes a third insulating portion 172, which is disposed between the limiting portion 146 and the end cap 130 along the first direction Z. Thus, the third insulating portion 172 achieves insulation between the limiting portion 146 and the end cap 130, reducing the risk of short circuit in the battery cell 100. Simultaneously, the third insulating portion 172 supports the limiting portion 146, thus cooperating with the limiting portion 146 to restrict the terminal post 140 from moving towards the electrode assembly 120 under external forces, improving the stability of the terminal post 140.

[0071] like Figure 2 , Figure 6 and Figure 7 As shown, the sealing member 150 further includes a second end face 154 disposed away from the electrode assembly 120. The second insulating member 170 also includes a fourth insulating portion 171 connected to the third insulating portion 172. The fourth insulating portion 171 protrudes from the side of the third insulating portion 172 near the electrode assembly 120. The fourth insulating portion 171 is inclined relative to the first direction Z. At least a portion of the fourth insulating portion 171 is located within the mounting hole 131. The fourth insulating portion 171 abuts against the side of the second end face 154 away from the electrode assembly 120, the first inclined surface 132, and the second inclined surface 141. In this way, the fourth insulating portion 171 can restrict the sealing member 150 from moving away from the electrode assembly 120 under external force, thereby helping to improve the stability of the electrode post 140. It can also better limit and compress the sealing member 150 in conjunction with the first inclined surface 132 and the second inclined surface 141, thereby helping to improve the sealing reliability of the sealing member 150.

[0072] like Figure 6 and Figure 7 As shown, the fourth insulating portion 171 is further provided with a second notch 1711 on its outer peripheral side, and the second notch 1711 is located on the side of the fourth insulating portion 171 near the second end face 154.

[0073] It is understandable that by setting the second notch 1711, the fourth insulating part 171 can form a rounded corner or chamfer, thereby guiding the fourth insulating part 171 into the mounting hole 131 during the installation of the second insulating member 170, thus reducing the installation difficulty of the second insulating member 170; at the same time, the second notch 1711 also provides clearance space for the compression deformation of the seal 150, thereby helping to improve the sealing reliability of the seal 150.

[0074] like Figure 9 and Figure 12 As shown, further, the dimension H1 of the limiting part 146 along the first direction Z satisfies: 0.5mm≤H1≤1.5mm.

[0075] For example, H1 can be any value from 0.5mm, 0.52mm, 0.7mm, 0.8mm, 1mm, 1.1mm, 1.3mm, 1.35mm, 1.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0076] Understandably, if H1 is too small, the structural strength of the limiting part 146 will be insufficient, and the pole post 140 will easily detach when subjected to external force in the direction close to the electrode assembly 120. When the limiting part 146 is manufactured using a riveting process, if H1 is too large, the second insulating component 170 is prone to excessive force and damage during the riveting process, increasing the risk of insulation failure. By controlling H1 within the range of 0.5mm to 1.5mm, the structural strength requirements of the limiting part 146 can be met, and the risk of insulation failure due to damage to the second insulating component 170 can also be reduced.

[0077] like Figure 9 and Figure 12 As shown, further, in the direction perpendicular to the first direction Z, the dimension L4 of the limiting part 146 protruding from the outer periphery of the main body part 145 satisfies: 0.5mm≤L4≤1.5mm.

[0078] For example, L4 can be any value from 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0079] Understandably, if L4 is too small, when the electrode post 140 is subjected to an external force in the direction close to the electrode assembly 120, the limiting part 146 may not receive sufficient support from the second insulating member 170, leading to the electrode post 140 detaching. When the limiting part 146 is manufactured using a riveting process, if L4 is too large, the second insulating member 170 may be subjected to excessive force during the riveting process, increasing the risk of insulation failure. By controlling L4 within the range of 0.5mm to 1.5mm, it is beneficial to improve the support force of the second insulating member 170 on the limiting part 146, thereby improving the stability of the electrode post 140, and also to reduce the risk of insulation failure due to force damage to the second insulating member 170.

[0080] like Figure 2 , Figure 6 and Figure 7As shown, the end cap 130 further includes a cover plate 133 and a flange 134. The cover plate 133 is connected to the housing 110 and the flange 134 respectively. The mounting hole 131 penetrates the cover plate 133 and the flange 134 along the first direction Z. At least a portion of the flange 134 protrudes from the side of the cover plate 133 away from the electrode assembly 120. The flange 134 is inclined relative to the first direction Z. The flange 134 surrounds the fourth insulating portion 171. The third insulating portion 172 is disposed between the limiting portion 146 and the flange 134 along the first direction Z. In this way, insulation between the electrode post 140 and the flange 134 can be achieved through the fourth insulating portion 171, and insulation between the limiting portion 146 and the flange 134 can be achieved through the third insulating portion 172, thereby reducing the risk of short circuit in the battery cell 100.

[0081] like Figures 7 to 9 As shown, the vertical distance L2 between the first end face 153 and the second end face 154 further satisfies: 1mm≤L2≤2.5mm.

[0082] For example, L2 can be any value from 1mm, 1.1mm, 1.25mm, 1.5mm, 1.55mm, 1.6mm, 1.7mm, 1.78mm, 1.8mm, 1.85mm, 1.9mm, 2mm, 2.2mm, 2.4mm, 2.43mm, 2.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0083] Understandably, if L2 is too small, the sealing reliability of the seal 150 may be insufficient, thus failing to achieve effective sealing. If L2 is too large, the dimension H2 of the flange 134 along the first direction Z needs to be increased, thereby affecting the energy density of the battery cell 100. By controlling L2 within the range of 1mm to 2.5mm, it is helpful to improve the sealing reliability of the seal 150 and also to increase the energy density of the battery cell 100.

[0084] like Figure 2 and Figure 12 As shown, the outer periphery of the flange 134 further has a fifth inclined surface 1341, which is connected to the side of the cover plate 133 away from the electrode assembly 120. The angle between the fifth inclined surface 1341 and the first inclined surface 132 is a fifth acute angle γ.

[0085] It is understandable that the fifth acute angle γ formed by the fifth inclined surface 1341 and the first inclined surface 132 helps to improve the structural strength of the flange 134. When the pole post 140 is subjected to an external force in the direction close to the electrode assembly 120, the flange 134 can provide more support for the limiting part 146, thereby reducing the risk of the pole post 140 falling off.

[0086] like Figure 7 and Figure 9 As shown, further, the dimension H3 of the cover plate 133 along the first direction Z satisfies: 1mm≤H3≤2.5mm.

[0087] For example, H3 can be any value from 1mm, 1.1mm, 1.25mm, 1.5mm, 1.55mm, 1.6mm, 1.67mm, 1.8mm, 1.85mm, 1.9mm, 2mm, 2.1mm, 2.3mm, 2.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0088] Understandably, if H3 is too small, the cover plate 133 will lack sufficient strength, making it prone to deformation under the internal pressure of the casing 110 when the battery cell 100 generates gas, thus affecting the electrical performance of the battery cell 100. If H3 is too large, it will excessively occupy space in the first direction Z, thus affecting the energy density of the battery cell 100. By controlling H3 within the range of 1mm to 2.5mm, it helps to enhance the reliability of the electrical connection between the terminal post 140 and the electrode assembly 120, thereby improving the electrical performance of the battery cell 100, and also helps to reduce the space occupied by the cover plate 133, thereby helping to improve the energy density of the battery cell 100.

[0089] like Figure 11 and Figure 12 As shown, the second insulating member 170 further includes a fifth insulating portion 174 connected to the third insulating portion 172. The fifth insulating portion 174 is disposed around the flange 134 and connected to the fifth inclined surface 1341. In this way, the fifth insulating portion 174 can extend the insulation distance between the terminal post 140 and the end cap 130, thereby effectively increasing the insulation performance and helping to reduce the risk of short circuit in the battery cell 100.

[0090] like Figure 2 as well as Figures 10 to 12 As shown, the second insulating member 170 further includes a sixth insulating member 175 connected to the fifth insulating member 174. The sixth insulating member 175 is disposed around the fifth insulating member 174. The battery cell 100 also includes an insulating layer 180, which is connected to the side of the cover plate 133 away from the electrode assembly 120 and overlaps with the sixth insulating member 175.

[0091] Understandably, the installation of the insulating layer 180 can reduce the risk of short circuit caused by contact between the battery cell 100 and the outside. By overlapping the insulating layer 180 with the sixth insulating part 175, the possibility of the side of the cover plate 133 away from the electrode assembly 120 being exposed can be reduced, thereby further reducing the risk of short circuit.

[0092] like Figure 2 and Figure 12 As shown, further, the cover plate 133 is provided with a relief groove 1331 on the side away from the electrode assembly 120, the entire sixth insulating part 175 is located in the relief groove 1331, and the insulating layer 180 is located on the side of the sixth insulating part 175 away from the electrode assembly 120.

[0093] It is understood that the sixth insulating portion 175 can be avoided by the clearance groove 1331 so that the sixth insulating portion 175 can be arranged on the side of the insulating layer 180 close to the electrode assembly 120, thereby achieving the overlap between the insulating layer 180 and the sixth insulating portion 175.

[0094] Of course, in the above embodiment, the insulating layer 180 can also be located on the side of the sixth insulating part 175 near the electrode assembly 120, that is, the insulating layer 180 is located between the cover plate 133 and the sixth insulating part 175. The insulating layer 180 and the sixth insulating part 175 can also be overlapped. Here, the positional relationship between the insulating layer 180 and the sixth insulating part 175 is not specifically limited.

[0095] like Figure 7 as well as Figures 13 to 15 As shown, the flange 134 further includes a first flange portion 1342 and a second flange portion 1343. The first flange portion 1342 is connected to the cover plate 133 and the second flange portion 1343 respectively. The first flange portion 1342 is inclined relative to the first direction Z. The second flange portion 1343 is bent relative to the first flange portion 1342 in a direction away from the limiting portion 146. The third insulating portion 172 is disposed between the limiting portion 146 and the second flange portion 1343 along the first direction Z.

[0096] Understandably, the provision of the second flange 1343 helps to increase the support area of ​​the flange 134 on the limiting portion 146, thereby providing greater support force and reducing the possibility of the pole post 140 moving towards the electrode assembly 120 due to external forces. The provision of the third insulating portion 172 enables insulation between the limiting portion 146 and the second flange 1343, thereby reducing the risk of short circuit caused by the second flange 1343 overlapping with the limiting portion 146.

[0097] It should be noted that, in the above embodiment, it can be understood that the first flange 1342 and the cover plate 133 enclose and form the mounting hole 131; of course, as Figure 2 and Figure 7 As shown, the entire protrusion of the flange 134 can also be provided on the side of the cover plate 133 away from the electrode assembly 120. The flange 134 and the cover plate 133 can also form a mounting hole 131. The structure of the flange 134 is not specifically limited here.

[0098] like Figure 7 and Figure 9 As shown, further, when the entire protrusion of the flange 134 is disposed on the side of the cover plate 133 away from the electrode assembly 120, the dimension H2 of the flange 134 along the first direction Z satisfies: 0.5mm≤H2≤2mm.

[0099] For example, H2 can be any value from 0.5mm, 0.55mm, 0.6mm, 0.62mm, 0.65mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.76mm, 1.8mm, 1.85mm, 1.9mm, 2mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0100] Understandably, if H2 is too small, it will affect the area of ​​the first inclined surface 132, thus affecting the sealing reliability of the seal 150; if H2 is too large, it will easily occupy too much space in the first direction Z, thus affecting the energy density of the battery cell 100. By controlling H2 within the range of 0.5mm to 2mm, it is helpful to achieve reliable sealing and also to reduce the space occupied by the flange 134, thereby helping to improve the energy density of the battery cell 100.

[0101] like Figure 7 and Figure 9 As shown, further, when the entire protrusion of the flange 134 is disposed on the side of the cover plate 133 away from the electrode assembly 120, the thickness L1 of the flange 134 satisfies: 0.8mm≤L1≤1.5mm.

[0102] For example, L1 can be any value from 0.8mm, 0.81mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0103] Understandably, if L1 is too small, the strength of the flange 134 will be insufficient, making it easy for the terminal post 140 to detach under the internal pressure of the casing 110 when gas is generated in the battery cell 100, leading to sealing failure. If L1 is too large, it will easily cause dimensional redundancy, thus affecting the energy density of the battery cell 100. By controlling L1 within the range of 0.8mm to 1.5mm, the risk of sealing failure can be reduced, and the energy density of the battery cell 100 can also be improved.

[0104] like Figure 2 and Figure 12As shown, the inner circumferential side of the flange 134 further has a first arc surface 1344, and the first arc surface 1344 is located on the side of the flange 134 away from the electrode assembly 120. The first arc surface 1344 is smoothly connected to the first inclined surface 132, and is connected to the third insulating part 172 and the fourth insulating part 171 respectively. In this way, the smoothness of the flange 134 is increased by the first arc surface 1344, thereby reducing the risk of the second insulating member 170 being punctured by the flange 134.

[0105] like Figure 2 and Figure 12 As shown, the outer periphery of the main body 145 further includes a second arc surface 147. The second arc surface 147 is smoothly connected to the second inclined surface 141 and the side of the limiting portion 146 near the electrode assembly 120, respectively. The second arc surface 147 is also connected to the third insulating portion 172 and the fourth insulating portion 171. In this way, the smoothness of the pole post 140 is increased by the second arc surface 147, thereby reducing the risk of the second insulating member 170 being punctured by the pole post 140.

[0106] like Figure 2 and Figure 12 As shown, the second insulating member 170 further includes a seventh insulating member 173 connected to the third insulating member 172. The seventh insulating member 173 protrudes from the third insulating member 172 on the side away from the electrode assembly 120, and the seventh insulating member 173 covers the outer periphery of the limiting member 146.

[0107] It is understandable that since the seventh insulating part 173 covers the outer periphery of the limiting part 146, it can be understood that the seventh insulating part 173 is connected to the outer periphery of the limiting part 146, and the seventh insulating part 173 blocks at least part of the outer periphery of the limiting part 146 in the second direction X perpendicular to the first direction Z. This can increase the creepage distance between the limiting part 146 and the end cover 130, thereby reducing the risk of short circuit.

[0108] like Figure 6 As shown, in some embodiments, the first acute angle α1 and the second acute angle α2 are equal, i.e., α1=α2. This makes the forces on the inner and outer circumferential sides of the seal 150 more balanced, which helps to improve the sealing reliability of the seal 150.

[0109] Furthermore, the following conditions must be met: 0.5°≤α1≤70°; 0.5°≤α2≤70°.

[0110] For example, the first acute angle α1 / second acute angle α2 can be any value from 0.5°, 1°, 2°, 5°, 10°, 11°, 12°, 15°, 18°, 20°, 25°, 30°, 35°, 38°, 40°, 43°, 45°, 46°, 50°, 54°, 60°, 62°, 64°, 65°, 68°, 70°, etc., or any value from a range of any two of them, without any specific limitation here.

[0111] Understandably, if α1 / α2 is too small, it will occupy space in the first direction Z of the battery cell 100, affecting the energy density of the battery cell 100. When manufacturing the terminal post 140 and end cap 130 using molds, if α1 / α2 is too large, it will increase the molding difficulty of the terminal post 140 and end cap 130, making mass production difficult. By controlling α1 and α2 within the range of 0.5° to 70°, space in the first direction Z of the battery cell 100 can be saved, thus helping to improve energy density. At the same time, the manufacturing difficulty of the end cap 130 and terminal post 140 can be reduced, thus facilitating mass production.

[0112] like Figure 6 and Figure 9 As shown, further, when the first acute angle α1 and the second acute angle α2 are equal, the vertical distance L3 between the first inclined plane 132 and the second inclined plane 141 satisfies: 0.7mm≤L3≤1.5mm.

[0113] For example, L3 can be any value from 0.7mm, 0.72mm, 0.76mm, 0.8mm, 0.86mm, 0.9mm, 0.98mm, 1mm, 1.1mm, 1.2mm, 1.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0114] Understandably, if L3 is too small, it will hinder the insulation between the terminal 140 and the end cap 130, making it easy for the terminal 140 to short-circuit with the end cap 130. If L3 is too large, the dimension H2 of the flange 134 along the first direction Z needs to be increased, thus affecting the energy density of the battery cell 100. By controlling L3 within the range of 0.7mm to 1.5mm, it helps to meet the insulation requirements between the terminal 140 and the end cap 130, and also helps to reduce the space occupied by the flange 134, thereby helping to improve the energy density of the battery cell 100.

[0115] like Figure 1 , Figure 2 and Figure 6As shown, in some embodiments, the battery cell 100 further includes a conductive element 190, which is disposed in the housing 110 and connected to the terminal post 140 and the electrode assembly 120 respectively, so as to realize the indirect electrical connection between the terminal post 140 and the electrode assembly 120.

[0116] Of course, in other embodiments, the electrode post 140 and the electrode assembly 120 may be directly electrically connected. Here, we will not make specific limitations on the way the electrode post 140 and the electrode assembly 120 are electrically connected.

[0117] like Figure 2 and Figure 6 As shown, the battery cell 100 is further applied to a battery pack with a busbar, which is used to realize the electrical connection between different battery cells 100. The terminal post 140 has a first surface 1421 disposed near the electrode assembly 120 and a second surface 1431 disposed away from the electrode assembly 120. The first surface 1421 is welded to the conductive element 190, and the second surface 1431 is welded to the busbar, so as to realize the electrical connection between the terminal post 140 and the busbar and the conductive element 190 respectively.

[0118] 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.

[0119] For example, the material of the bus / conductive component 190 / terminal 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.

[0120] For example, on the negative electrode side of the battery cell 100, when the negative electrode post 140 includes a first electrode post portion 142 and a second electrode post portion 143, the material of the conductive element 190 and the material of the first electrode post portion 142 can be copper, and the material of the second electrode post portion 143 and the busbar can be aluminum.

[0121] For example, on the positive electrode side of the battery cell 100, the materials of the conductive component 190, the positive electrode post 140, and the busbar can all be aluminum, without specific limitations.

[0122] For example, the materials of the first insulating element 160 / second insulating element 170 / insulating layer 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.

[0123] For example, the material of the seal 150 can be nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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 by, Having a first orientation (Z), the battery cell includes: Casing (110); An electrode assembly (120) is disposed within the housing (110); The end cap (130) is connected to the housing (110) and has a mounting hole (131) extending through the first direction (Z), the wall of the mounting hole (131) having a first inclined surface (132). A pole post (140) is inserted through the mounting hole (131) and is insulated from the end cap (130). The pole post (140) is electrically connected to the electrode assembly (120). The outer periphery of the pole post (140) has a second inclined surface (141). The pole post (140) has a first surface (1421) disposed near the electrode assembly (120). The angle between the first inclined surface (132) and the first surface (1421) is a first acute angle. The angle between the second inclined surface (141) and the first surface (1421) is a second acute angle. A sealing element (150) is disposed around the pole post (140) and has a first end face (153) disposed near the electrode assembly (120). The entire sealing element (150) is located within the mounting hole (131). The sealing element (150) is sealed to the first inclined surface (132) and the second inclined surface (141) respectively. A first insulating element (160) is disposed around the pole post (140), at least a portion of the first insulating element (160) is located within the housing (110), and the first insulating element (160) is connected to the side of the first end face (153) near the electrode assembly (120).

2. The battery cell of claim 1, wherein, The outer periphery of the seal (150) has a third inclined surface (151) that abuts against the first inclined surface (132). The angle between the third inclined surface (151) and the first surface (1421) is a third acute angle, which is equal to the first acute angle.

3. The battery cell of claim 1, wherein, The inner circumferential side of the seal (150) has a fourth inclined surface (152) that abuts against the second inclined surface (141). The angle between the fourth inclined surface (152) and the first surface (1421) is a fourth acute angle, which is equal to the second acute angle.

4. The battery cell of claim 1, wherein, The first insulating member (160) includes a first insulating portion (161) and a second insulating portion (162) connected to each other. The first insulating portion (161) is located on the side of the end cap (130) close to the electrode assembly (120). The second insulating portion (162) protrudes from the side of the first insulating portion (161) away from the electrode assembly (120). The second insulating portion (162) is inclined relative to the first direction (Z). At least a portion of the second insulating portion (162) is located in the mounting hole (131). The second insulating portion (162) abuts against the first inclined surface (132), the second inclined surface (141), and the first end face (153), respectively.

5. The battery cell of claim 4, wherein, The second insulating part (162) has a first notch (1621) on its outer periphery, and the first notch (1621) is located on the side of the second insulating part (162) near the first end face (153).

6. The battery cell of claim 1, wherein, The electrode post (140) includes a main body (145) and a limiting part (146) connected to each other. The main body (145) is located on the side of the limiting part (146) close to the electrode assembly (120) and is electrically connected to the electrode assembly (120). The limiting part (146) is disposed on the side of the end cap (130) away from the electrode assembly (120). The outer peripheral side of the main body (145) has a second inclined surface (141).

7. The battery cell of claim 6, wherein, The electrode post (140) includes a first electrode post portion (142) and a second electrode post portion (143) connected to each other. The first electrode post portion (142) is located on the side of the second electrode post portion (143) close to the electrode assembly (120) and is electrically connected to the electrode assembly (120). The main body portion (145) is composed of the portion of the second electrode post portion (143) close to the electrode assembly (120) and the first electrode post portion (142). The limiting portion (146) is composed of the portion of the second electrode post portion (143) away from the electrode assembly (120).

8. The battery cell of claim 7, wherein, Along the first direction (Z), the orthographic projection of the first inclined surface (132) on the electrode assembly (120) and the orthographic projection of the first pole post (142) on the electrode assembly (120) at least partially overlap.

9. The battery cell of claim 7, wherein, Along the first direction (Z), the orthographic projection of the first inclined surface (132) on the electrode assembly (120) and the orthographic projection of the second pole post (143) on the electrode assembly (120) at least partially overlap.

10. The battery cell of claim 7, wherein, The pole post (140) has a composite interface (144) formed by connecting the first pole post portion (142) and the second pole post portion (143), and at least a portion of the first end face (153) is disposed close to the first surface (1421) relative to the composite interface (144) along the first direction (Z).

11. The battery cell of claim 6, wherein, The battery cell also includes a second insulating member (170) surrounding the terminal post (140), the second insulating member (170) including a third insulating portion (172), the third insulating portion (172) being disposed between the limiting portion (146) and the end cap (130) along the first direction (Z).

12. The battery cell of claim 11, wherein, The sealing member (150) has a second end face (154) disposed away from the electrode assembly (120). The second insulating member (170) further includes a fourth insulating portion (171) connected to the third insulating portion (172). The fourth insulating portion (171) protrudes from the side of the third insulating portion (172) near the electrode assembly (120). The fourth insulating portion (171) is inclined relative to the first direction (Z). At least a portion of the fourth insulating portion (171) is located in the mounting hole (131). The fourth insulating portion (171) abuts against the side of the second end face (154) away from the electrode assembly (120), the first inclined surface (132), and the second inclined surface (141), respectively.

13. The battery cell of claim 12, wherein, The fourth insulating part (171) has a second notch (1711) on its outer periphery, and the second notch (1711) is located on the side of the fourth insulating part (171) near the second end face (154).

14. The battery cell of claim 12, wherein, The end cap (130) includes a cover plate (133) and a flange (134). The cover plate (133) is connected to the housing (110) and the flange (134) respectively. The mounting hole (131) passes through the cover plate (133) and the flange (134) along the first direction (Z). At least a portion of the flange (134) protrudes from the side of the cover plate (133) away from the electrode assembly (120). The flange (134) is inclined relative to the first direction (Z). The flange (134) surrounds the fourth insulating part (171). The third insulating part (172) is disposed between the limiting part (146) and the flange (134) along the first direction (Z).

15. The battery cell of claim 14, wherein, The outer periphery of the flange (134) has a fifth inclined surface (1341), which is connected to the side of the cover plate (133) away from the electrode assembly (120). The angle between the fifth inclined surface (1341) and the first inclined surface (132) is a fifth acute angle.

16. The battery cell of claim 15, wherein, The second insulating member (170) further includes a fifth insulating part (174) connected to the third insulating part (172), the fifth insulating part (174) being disposed around the flange (134) and connected to the fifth inclined surface (1341).

17. The battery cell of claim 16, wherein, The second insulating member (170) further includes a sixth insulating part (175) connected to the fifth insulating part (174), the sixth insulating part (175) being disposed around the fifth insulating part (174), and the battery cell further includes an insulating layer (180) connected to the side of the cover plate (133) away from the electrode assembly (120) and overlapping the sixth insulating part (175).

18. The battery cell of claim 17, wherein, The cover plate (133) has a clearance groove (1331) on the side away from the electrode assembly (120), the entire sixth insulating part (175) is located in the clearance groove (1331), and the insulating layer (180) is located on the side of the sixth insulating part (175) away from the electrode assembly (120).

19. The battery cell of claim 14, wherein, The flange (134) includes a first flange portion (1342) and a second flange portion (1343). The first flange portion (1342) is connected to the cover plate (133) and the second flange portion (1343) respectively. The first flange portion (1342) is inclined relative to the first direction (Z). The second flange portion (1343) is bent relative to the first flange portion (1342) in a direction away from the limiting portion (146). The third insulating portion (172) is disposed between the limiting portion (146) and the second flange portion (1343) along the first direction (Z).

20. The battery cell of claim 14, wherein, The inner circumferential side of the flange (134) has a first arc surface (1344), and the first arc surface (1344) is located on the side of the flange (134) away from the electrode assembly (120). The first arc surface (1344) is smoothly connected to the first inclined surface (132) and is connected to the third insulating part (172) and the fourth insulating part (171) respectively.

21. The battery cell of claim 14, wherein, The outer periphery of the main body (145) has a second arc surface (147), which is smoothly connected to the second inclined surface (141) and the side of the limiting part (146) near the electrode assembly (120), respectively. The second arc surface (147) is connected to the third insulating part (172) and the fourth insulating part (171), respectively.

22. The battery cell of claim 11, wherein, The second insulating member (170) further includes a seventh insulating part (173) connected to the third insulating part (172), the seventh insulating part (173) protruding from the third insulating part (172) on the side away from the electrode assembly (120), and the seventh insulating part (173) covering the outer periphery of the limiting part (146).

23. The battery cell of claim 1, wherein, The first acute angle and the second acute angle are equal.

24. A battery pack, characterized by Includes the battery cell according to any one of claims 1 to 23.

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