Battery cell and battery pack

Abstract

The application provides a battery monomer and a battery pack, and relates to the technical field of batteries. The battery monomer is applied to a battery pack with a busbar and is provided with a conductive piece. The conductive piece is located on the side of an end cover away from an electrode assembly and is insulated from the end cover. The conductive piece comprises a first conductive part and a second conductive part. The first conductive part is connected with a pole and the second conductive part respectively. The size of the second conductive part along a first direction is greater than the size of the first conductive part along the first direction. The second conductive part is used for welding with the busbar. The battery monomer provided by the application can provide a greater welding penetration depth through the second conductive part with a relatively greater size along the first direction, thereby helping to improve the overcurrent capacity of the battery monomer and improving the electrical performance and safety of the battery monomer.

Description

Technical Field

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

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

[0003] Battery cells and busbars are important components of a battery pack. The busbars are welded to the battery cells to enable electrical connections between different cells. Currently, battery cells are manufactured to reduce costs and increase energy density by shrinking the size of their terminals. However, as the terminal size decreases, the battery cells may lack sufficient current carrying capacity, thus affecting their electrical performance and safety. 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 improve the electrical performance and safety of the battery cell.

[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 applied to a battery pack having a busbar. The battery cell has a first direction and includes: a housing; an electrode assembly disposed within the housing; an end cap connected to the housing and having a mounting through hole; a terminal post passing through the mounting through hole and insulated from the end cap, the terminal post being electrically connected to the electrode assembly; and a conductive element located on the side of the end cap away from the electrode assembly and insulated from the end cap. The conductive element includes a first conductive portion and a second conductive portion. The first conductive portion is electrically connected to the terminal post and the second conductive portion, respectively. The first conductive portion is located between the terminal post and the second conductive portion. The dimension of the second conductive portion along the first direction is larger than the dimension of the first conductive portion along the first direction. The second conductive portion is used for welding to the busbar.

[0006] In some embodiments of the first aspect, a recessed groove is provided on the side of the first conductive portion away from the electrode assembly, the recessed groove communicating with the mounting through hole, and along the first direction, the electrode post has a first surface disposed away from the electrode assembly, the first surface not extending beyond the recessed groove. In some embodiments of the first aspect, the recessed groove has a bottom, the bottom of which is welded to the outer periphery of the electrode post to form a weld, the entire weld being contained within the recessed groove.

[0007] In some embodiments of the first aspect, the first surface is flush with the bottom of the groove along the first direction.

[0008] In some embodiments of the first aspect, the first conductive portion is disposed around the pole post and contacts the outer peripheral side of the pole post; the second conductive portion is disposed around the first conductive portion and is fixedly connected to the outer peripheral side of the first conductive portion.

[0009] In some embodiments of the first aspect, the conductive element includes a plurality of conductive bodies, each of the conductive bodies including a first conductive portion and a second conductive portion, and the plurality of conductive bodies are arranged at circumferential intervals along the pole post.

[0010] In some embodiments of the first aspect, the battery cell further has a second direction and a third direction, the first direction, the second direction and the third direction being perpendicular to each other, the number of conductive bodies being two, the two conductive bodies being spaced apart along the second direction and forming a separation gap, the extension direction of the separation gap being parallel to the third direction.

[0011] In some embodiments of the first aspect, the battery cell further includes a seal surrounding the terminal post, the entire seal being received within the mounting through hole, the outer periphery of the terminal post having a first inclined surface, the wall of the mounting through hole having a second inclined surface, the inner periphery of the seal having a third inclined surface conforming to the first inclined surface, the outer periphery of the seal having a fourth inclined surface conforming to the second inclined surface, the terminal post having a second surface disposed near the electrode assembly, the angle between the first inclined surface and the second surface being a first acute angle, the angle between the second inclined surface and the second surface being a second acute angle, the angle between the third inclined surface and the second surface being a third acute angle, and the angle between the fourth inclined surface and the second surface being a fourth acute angle.

[0012] In some embodiments of the first aspect, the first acute angle, the second acute angle, the third acute angle, and the fourth acute angle are all equal.

[0013] 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 second electrode post portion being electrically connected to the first conductive portion, and the first inclined surface being formed by all the outer peripheral sides of the first electrode post portion and at least a portion of the outer peripheral sides of the second electrode post portion.

[0014] In some embodiments of the first aspect, along the first direction, the orthographic projection of the second inclined surface on the electrode assembly and the orthographic projection of the first pole portion on the electrode assembly at least partially coincide; and / or, the orthographic projection of the second inclined surface on the electrode assembly and the orthographic projection of the second pole portion on the electrode assembly at least partially coincide.

[0015] In some embodiments of the first aspect, the electrode post has a composite interface formed by the connection of the first electrode post portion and the second electrode post portion, and the seal further has a first end face disposed near the electrode assembly; along the first direction, at least a portion of the first end face is disposed near the second surface relative to the composite interface.

[0016] In some embodiments of the first aspect, the battery cell further includes a first insulating member located within the housing and surrounding the terminal post. The first insulating member includes a first insulating portion and a second insulating portion connected together. The first insulating portion is located on the side of the end cap near the electrode assembly, and the second insulating portion protrudes from the side of the first insulating portion away from the electrode assembly. The second insulating portion is inclined relative to the first direction. At least a portion of the second insulating portion is received within the mounting through hole. The second insulating portion abuts against the side of the seal near the electrode assembly, and the second insulating portion is connected to the first inclined surface and the second inclined surface, respectively.

[0017] In some embodiments of the first aspect, the battery cell further includes a second insulating member surrounding the terminal post, the second insulating member including a third insulating portion, the end cap including a cover plate and a flange, the cover plate being connected to the housing and the flange respectively, the flange having the mounting through hole, at least a portion of the flange protruding from the cover plate on the side away from the electrode assembly, the flange being inclined relative to the first direction, the terminal post, the first conductive portion and the second conductive portion forming a first receiving groove, at least a portion of the third insulating portion being received in the first receiving groove; the third insulating portion having a second receiving groove, the end of the flange away from the cover plate being received in the second receiving groove.

[0018] In some embodiments of the first aspect, the third insulating portion includes a first insulating segment, a second insulating segment, and a third insulating segment, the second insulating segment being connected between the first insulating segment and the third insulating segment, and the first insulating segment, the second insulating segment, and the third insulating segment forming a second receiving groove, the first insulating segment abutting against the side of the seal away from the electrode assembly, and the first insulating segment being connected to the flange and the pole post respectively.

[0019] 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 second flange portion and the cover plate respectively, the first flange portion being inclined relative to the first direction, the second flange portion being bent relative to the first flange portion toward the direction close to the electrode assembly, both the second flange portion and the first flange portion being received in the second receiving groove, and the second flange portion abutting against the side of the seal away from the electrode assembly.

[0020] In some embodiments of the first aspect, the outer periphery of the pole post is provided with a clearance groove communicating with the mounting through hole, the clearance groove communicating with the first receiving groove, the first insulating section being received in the clearance groove, at least a portion of the seal being located between the first insulating section and the first flange, the first insulating section abutting against the third inclined surface on a first side facing the seal, and the first flange abutting against the fourth inclined surface on a second side facing the seal.

[0021] In some embodiments of the first aspect, the second insulating member further includes a fourth insulating portion connected to the third insulating portion, the fourth insulating portion being disposed around the third insulating portion and disposed between the second conductive portion and the cover plate.

[0022] In some embodiments of the first aspect, the battery cell further has a second direction perpendicular to the first direction, the fourth insulating portion extends along the second direction, the fourth insulating portion includes a body segment and an extension segment, the body segment is located between the second conductive portion and the cover plate; along the second direction, the extension segment is connected to the side of the body segment away from the third insulating portion.

[0023] In some embodiments of the first aspect, the body segment is provided with a buffer cavity.

[0024] Secondly, embodiments of this application provide a battery pack including a busbar and a battery cell as described in any of the embodiments of the first aspect above, wherein the busbar is welded to the second conductive portion of the battery cell.

[0025] The beneficial effects of this application are as follows: This application provides a battery cell for use in a battery pack with a busbar, and includes a conductive element located on the side of the end cap away from the electrode assembly and insulated from the end cap. The conductive element includes a first conductive portion and a second conductive portion. The first conductive portion is electrically connected to the terminal post and the second conductive portion, respectively. The dimension of the second conductive portion along a first direction is larger than the dimension of the first conductive portion along the first direction. The second conductive portion is used for welding to the busbar. By welding the second conductive portion, which has a relatively larger dimension along the first direction, to the busbar, a greater weld penetration can be provided, thereby helping to improve the current carrying capacity of the battery cell and enhancing the electrical performance and safety 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 electrode assembly and casing 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 7 A cross-sectional view of the second insulating component; Figure 10 It shows Figure 5 Enlarged structural diagram of region D Figure 2 ; Figure 11 This application shows a three-dimensional structural diagram of a battery cell when the electrode assembly and housing are hidden in other embodiments; Figure 12 It shows Figure 9 Schematic diagram of the cross-sectional structure at the middle EE; Figure 13 It shows Figure 12 A magnified structural diagram of region F in the middle; Figure 14 This invention provides a three-dimensional structural schematic diagram showing the battery cell with its electrode assembly and housing hidden in some other embodiments of the present application. Figure 15 It shows Figure 14 Schematic diagram of the cross-sectional structure at the middle GG point; Figure 16 It shows Figure 15 A magnified structural diagram of region H in the middle.

[0029] Explanation of key component symbols: 100-Battery cell; 110-Housing; 120-Electrode assembly; 130-End cap; 131-Mounting through hole; 132-Second bevel; 133-Cover plate; 134-Flange; 1341-First flange; 13411-Second side; 1342-Second flange; 140-Terminal post; 141-First bevel; 142-First terminal post; 1421-Second surface; 143-Second terminal post; 1431-First surface; 144-Composite interface; 145-Allowing groove; 150-Conductive component; 1501-Conductive body; 1502-Separation gap; 1503-Third surface; 1504-First receiving groove; 151-First conductive part; 1511-Submerged part 15111-Gate bottom; 1512-Weld; 152-Second conductive part; 160-Sealing element; 161-Third inclined surface; 162-Fourth inclined surface; 163-First end face; 164-Second end face; 170-First insulating element; 171-First insulating part; 172-Second insulating part; 180-Second insulating element; 181-Third insulating part; 1811-Second receiving groove; 1812-First insulating section; 18121-First side surface; 1813-Second insulating section; 1814-Third insulating section; 182-Fourth insulating part; 1821-Body section; 1822-Extension section; 190-Adapter; 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] In the description of this application, the term "fixed connection" can be understood as: two objects whose relative positions remain unchanged under normal use conditions, that is, they will not easily undergo relative movement (e.g., relative rotation and relative movement); for example, a fixed connection can be an adhesive connection, a screw connection, a snap-fit ​​connection, a welding connection, a riveting connection, a magnetic connection, a friction contact connection, or a one-piece molded structure, etc., without any specific limitations.

[0038] Battery cells and busbars are important components of a battery pack. The busbars are welded to the battery cells to enable electrical connections between different cells. Current battery cells reduce manufacturing costs and increase energy density by shrinking the size of the terminals. However, as the terminal size decreases, the battery cells may lack sufficient current carrying capacity, thus affecting their electrical performance and safety.

[0039] Furthermore, in related technologies, the sealing element of a battery cell includes two parts: a first sealing part and a second sealing part. The first sealing part is housed in the mounting through 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, a reliable seal 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.

[0040] like Figure 1 As shown, in order 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 applied to battery packs with busbars, so as to be indirectly applied to electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly applied to 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.

[0041] 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.

[0042] like Figure 1 and Figure 2 As shown, the battery cell 100 provided in this embodiment has a first direction Z, and the battery cell 100 includes: a housing 110, an electrode assembly 120, an end cap 130, a terminal post 140, and a conductive element 150.

[0043] Combination Figures 3 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 has a mounting through hole 131; the electrode post 140 passes through the mounting through hole 131 and is insulated from the end cap 130, and is electrically connected to the electrode assembly 120; the conductive element 150 is located on the side of the end cap 130 away from the electrode assembly 120 and is insulated from the end cap 130. The conductive element 150 includes a first conductive part 151 and a second conductive part 152. The first conductive part 151 is electrically connected to the electrode post 140 and the second conductive part 152 respectively. The first conductive part 151 is located between the electrode post 140 and the second conductive part 152. The dimension T2 of the second conductive part 152 along the first direction Z is greater than the dimension T1 of the first conductive part 151 along the first direction Z. The second conductive part 152 is used to weld to the busbar so that the conductive element 150 is electrically connected to the busbar.

[0044] It should be noted that, for ease of understanding that "the first conductive part 151 is located between the pole post 140 and the second conductive part 152," an auxiliary dashed line K parallel to the first direction Z is constructed here to divide the first conductive part 151 and the second conductive part 152. For example... Figure 6As shown, the first conductive part 151 is located on the side of the auxiliary dashed line K closer to the pole post 140, and the second conductive part 152 is located on the side of the auxiliary dashed line K away from the pole post 140. It should be understood that the constructed auxiliary dashed line K is only used for illustrative purposes in this application and should not be construed as a limitation of this application.

[0045] It should be noted that, as Figure 7 As shown, when both opposite surfaces of the first conductive part 151 along the first direction Z are planar, the aforementioned "dimension T1 of the first conductive part 151 along the first direction Z" can be understood as the vertical distance between the two opposite surfaces of the first conductive part 151 along the first direction Z; when at least one of the two opposite surfaces of the first conductive part 151 along the first direction Z is not planar (e.g., wavy surface, inclined surface, conical surface, etc.), the aforementioned "dimension T1 of the first conductive part 151 along the first direction Z" can be understood as the maximum vertical distance between the two opposite surfaces of the first conductive part 151 along the first direction Z.

[0046] In addition, such as Figure 7 As shown, when both opposite surfaces of the second conductive part 152 along the first direction Z are planar, the aforementioned "dimension T2 of the second conductive part 152 along the first direction Z" can be understood as the vertical distance between the two opposite surfaces of the second conductive part 152 along the first direction Z; when at least one of the two opposite surfaces of the second conductive part 152 along the first direction Z is not planar (e.g., wavy surface, inclined surface, conical surface, etc.), the aforementioned "dimension T2 of the second conductive part 152 along the first direction Z" can be understood as the maximum vertical distance between the two opposite surfaces of the second conductive part 152 along the first direction Z.

[0047] It is understood that the battery cell 100 provided in this embodiment is applied to a battery pack with a busbar and is provided with a conductive element 150. The conductive element 150 is located on the side of the end cover 130 away from the electrode assembly 120 and is insulated from the end cover 130. The conductive element 150 includes a first conductive portion 151 and a second conductive portion 152. The first conductive portion 151 is electrically connected to the terminal post 140 and the second conductive portion 152, respectively. The dimension of the second conductive portion 152 along the first direction Z is larger than the dimension of the first conductive portion 151 along the first direction Z. The second conductive portion 152 is used for welding to the busbar. By welding the busbar with the second conductive portion 152, which has a relatively large dimension along the first direction Z, a larger weld penetration can be provided, thereby helping to improve the current carrying capacity of the battery cell 100, thus improving the electrical performance and safety of the battery cell 100.

[0048] like Figure 6 As shown, in some embodiments, the dimension T2 of the second conductive portion 152 along the first direction Z satisfies: 1.5mm≤T2≤3mm.

[0049] For example, T2 can be any value from 1.5mm, 1.51mm, 1.55mm, 1.56mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.75mm, 2.9mm, 3mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0050] Understandably, if T2 is too small, the weld penetration between the second conductive part 152 and the busbar may be insufficient, affecting the current carrying capacity and consequently increasing heat generation during the charging and discharging of the battery cell 100, thus impacting its safety. Conversely, if T2 is too large, the second conductive part 152 may occupy excessive space in the first direction Z of the battery cell 100, affecting the energy density of the battery cell 100. By controlling T2 within the range of 1.5mm to 3mm, the risk of insufficient weld penetration between the second conductive part 152 and the busbar can be reduced, and space utilization can be improved, thereby contributing to increasing the energy density of the battery cell 100.

[0051] like Figure 7 and Figure 10 As shown, in some embodiments, when the second conductive part 152 is arranged around the first conductive part 151, the minimum vertical distance L1 between the outer wall surface and the inner wall surface of the part of the second conductive part 152 that is welded to the busbar satisfies: 3.5m≤L1≤7mm.

[0052] For example, L1 can be any value from 3.5mm, 3.6mm, 3.7mm, 4mm, 4.2mm, 4.5mm, 4.56mm, 4.7mm, 4.9mm, 5mm, 5.1mm, 5.3mm, 5.5mm, 6mm, 6.3mm, 6.5mm, 6.8mm, 6.9mm, 7mm, etc., or any value within a range of any two of these, without specific limitations. It is understood that if L1 is too small, the welding area between the second conductive part 152 and the busbar may be insufficient, thus affecting the current carrying capacity; if L1 is too large, it will cause dimensional redundancy, thus affecting the energy density of the battery cell 100. By controlling L1 within the range of 3.5mm to 7mm, it helps to meet the welding area requirements and also helps to improve the energy density of the battery cell 100.

[0053] like Figure 2 and Figure 6As shown, in some embodiments, the first conductive part 151 is provided with a groove 1511 on the side away from the electrode assembly 120. The groove 1511 communicates with the mounting through hole 131. Along the first direction Z, the pole post 140 has a first surface 1431 disposed away from the electrode assembly 120. The first surface 1431 does not extend beyond the groove 1511.

[0054] Understandably, for the sake of convenience, we will use the following terms here: Figure 6 Taking the shown state as an example, "the first surface 1431 does not exceed the settling groove 1511" can be understood as the first surface 1431 being lower than the third surface 1503 where the groove opening of the settling groove 1511 is located. With this design, when the second conductive part 152 is welded to the busbar, it helps to reduce the possibility of structural interference between the first surface 1431 of the pole post 140 and the busbar, thereby helping to improve the reliability of the welding between the second conductive part 152 and the busbar.

[0055] like Figure 6 As shown, the settling tank 1511 further includes a bottom 15111, which is welded to the outer periphery of the pole post 140 to form a weld 1512, and the entire weld 1512 is contained within the settling tank 1511.

[0056] It is understandable that when the first conductive part 151 is welded to the pole 140, the entire weld 1512 is contained in the sink 1511, that is, the entire weld 1512 is completely located within the sink 1511. This helps to reduce the possibility that the weld 1512 may exceed the sink 1511 and cause structural interference with the busbar, thereby helping to further improve the reliability of the welding between the second conductive part 152 and the busbar.

[0057] like Figure 6 As shown, further, along the first direction Z, the first surface 1431 is flush with the bottom of the groove 15111, which facilitates reliable welding of the bottom of the groove 15111 to the outer periphery of the pole post 140, thereby helping to achieve a reliable electrical connection between the pole post 140 and the first conductive part 151.

[0058] like Figure 6 and Figure 10 As shown, further, along the first direction Z, the depth H1 of the settling trench 1511 satisfies: 0.2mm≤H1≤0.5mm.

[0059] For example, H1 can be any value from 0.2mm, 0.21mm, 0.25mm, 0.28mm, 0.3mm, 0.34mm, 0.35mm, 0.38mm, 0.4mm, 0.42mm, 0.43mm, 0.45mm, 0.47mm, 0.49mm, 0.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0060] Understandably, if H1 is too small, the weld 1512 may easily interfere with the busbar, increasing the risk of poor soldering between the busbar and the second conductive part 152, thus affecting the current carrying capacity. If H1 is too large, the residual thickness H2 of the first conductive part 151 at the sink 1511 may be insufficient, thus affecting the welding strength between the first conductive part 151 and the terminal post 140, which will also affect the current carrying capacity. By controlling H1 within the range of 0.2 mm to 0.5 mm, it is helpful to improve the welding yield between the busbar and the second conductive part 152, and also to improve the welding strength between the terminal post 140 and the first conductive part 151, thereby helping to improve the current carrying capacity of the battery cell 100.

[0061] like Figure 6 and Figure 10 As shown, further, the residual thickness H2 of the first conductive part 151 at the sink 1511 satisfies: 0.7mm≤H2≤1.5mm.

[0062] For example, H2 can be any value from 0.7mm, 0.73mm, 0.75mm, 0.8mm, 0.81mm, 0.84mm, 0.85mm, 1mm, 1.1mm, 1.2mm, 1.25mm, 1.3mm, 1.38mm, 1.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0063] Understandably, if H2 is too small, it will affect the welding strength between the first conductive part 151 and the terminal post 140; if H2 is too large, it will occupy too much space in the first direction Z of the battery cell 100, thus affecting the energy density of the battery cell 100. By controlling H2 within the range of 0.7mm to 1.5mm, it is possible to improve the welding strength between the first conductive part 151 and the terminal post 140, and also to help reduce the space occupied by the first conductive part 151, thereby helping to improve the energy density of the battery cell 100.

[0064] like Figure 6 As shown, in some embodiments, a first conductive portion 151 is disposed around the terminal post 140 and contacts the outer peripheral side of the terminal post 140. A second conductive portion 152 is disposed around the first conductive portion 151 and is fixedly connected to the outer peripheral side of the first conductive portion 151. This helps to increase the current flow area between the terminal post 140 and the conductive element 150 and between the conductive element 150 and the busbar, thereby helping to improve the current flow capacity of the battery cell 100.

[0065] It should be noted that the outer periphery of the electrode post 140 refers to the outer periphery of the electrode post 140, that is, the outer wall portion around the electrode post 140; the outer periphery of the first conductive part 151 refers to the outer periphery of the first conductive part 151, that is, the outer wall portion around the first conductive part 151.

[0066] like Figure 4 and Figure 11 As shown, in some embodiments, the conductive element 150 includes a plurality of conductive bodies 1501, each conductive body 1501 including a first conductive portion 151 and a second conductive portion 152, and the plurality of conductive bodies 1501 are arranged at intervals along the circumference of the pole post 140.

[0067] It is understandable that by dividing the conductive component 150 into multiple conductive bodies 1501, during the assembly process of the battery cell 100, each conductive body 1501 can be assembled radially to the outer periphery of the terminal post 140, and then each conductive body 1501 can be welded to the outer periphery of the terminal post 140 to complete the electrical connection between them, thus reducing the assembly difficulty of the conductive component 150.

[0068] like Figure 1 and Figure 11 As shown, the battery cell 100 further has a second direction X and a third direction Y. The first direction Z, the second direction X and the third direction Y are perpendicular to each other. The number of conductive bodies 1501 is two. The two conductive bodies 1501 are spaced apart along the second direction X and form a separation gap 1502. The extension direction of the separation gap 1502 is parallel to the third direction Y.

[0069] It is understandable that after the conductive body 1501 is welded to the busbar, the force exerted by the busbar on the conductive component 150 is usually parallel to the third direction Y. This force may cause the conductive body 1501 to detach from the terminal post 140. By setting the extension direction of the separation gap 1502 between the two conductive bodies 1501 to be parallel to the third direction Y, it can be understood that the separation gap 1502 extends along the third direction Y. This helps to reduce the risk of the conductive body 1501 detaching from the terminal post 140 due to the force exerted by the busbar in the third direction Y.

[0070] like Figures 3 to 5 as well as Figure 7As shown, in some embodiments, the battery cell 100 further includes a sealing member 160 surrounding the terminal post 140. The entire sealing member 160 is received in the mounting through hole 131. The outer peripheral side of the terminal post 140 has a first inclined surface 141, the hole wall of the mounting through hole 131 has a second inclined surface 132, the inner peripheral side of the sealing member 160 has a third inclined surface 161 that fits against the first inclined surface 141, and the outer peripheral side of the sealing member 160 has a fourth inclined surface 162 that fits against the second inclined surface 132. The terminal post 140 has a second surface 1421 disposed near the electrode assembly 120. The angle between the first inclined surface 141 and the second surface 1421 is a first acute angle α1, the angle between the second inclined surface 132 and the second surface 1421 is a second acute angle α2, the angle between the third inclined surface 161 and the second surface 1421 is a third acute angle β1, and the angle between the fourth inclined surface 162 and the second surface 1421 is a fourth acute angle β2.

[0071] It should be noted that the angle α1 between the first inclined plane 141 and the second 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 141 and the second surface 1421, for example... Figure 4 , Figure 5 and Figure 7 As 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 141, and the second surface 1421; the included angle α2 between the second oblique surface 132 and the second surface 1421 can be understood as the angle formed between the second oblique line formed by the intersection of the cutting plane and the second oblique surface 132, and the second surface 1421, for example... Figure 4 , Figure 5 and Figure 7 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 132 and the second surface 1421.

[0072] Similarly, the angle β1 between the third inclined plane 161 and the second 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 161 and the second surface 1421, for example... Figure 4 , Figure 5 and Figure 7 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 161, and the second surface 1421; the included angle β2 between the fourth oblique surface 162 and the second surface 1421 can be understood as the angle formed between the fourth oblique line formed by the intersection of the cutting plane and the fourth oblique surface 162, and the second surface 1421, for example... Figure 4 , Figure 5 and Figure 7As 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 162 and the second surface 1421.

[0073] It should be noted that an acute angle means: 0° < angle < 90°, such as 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.

[0074] Understandably, since the entire seal 160 is housed within the mounting through-hole 131, meaning the entire seal 160 is completely located within the mounting through-hole 131, the seal 160 does not require the second sealing portion found in related technologies. Simultaneously, because the seal 160 is jointly limited and compressed by the first inclined surface 141 and the second inclined surface 132, the terminal post 140 does not require the radially extending support portion found in related technologies. This achieves reliable sealing while saving materials on the terminal post 140 and the seal 160, thereby helping to reduce the manufacturing cost of the battery cell 100 and improve space utilization, ultimately increasing the energy density of the battery cell 100.

[0075] Furthermore, the first acute angle α1, the second acute angle α2, the third acute angle β1, and the fourth acute angle β2 are all equal, i.e., α1=α2=β1=β2. This allows the seal 160 to fit more tightly with the terminal post 140 and the end cap 130, which helps to increase the area of ​​close contact between the seal 160 and the terminal post 140 and the end cap 130, thereby helping to improve the sealing performance of the battery cell 100.

[0076] like Figure 4 , Figure 5 and Figure 7 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 second electrode post portion 143 is electrically connected to the first conductive portion 151. The first inclined surface 141 is formed by the entire outer peripheral side of the first electrode post portion 142 and at least a portion of the outer peripheral side of the second electrode post portion 143.

[0077] It is understandable that the first electrode portion 142 and the second electrode portion 143 can be made of different materials, thereby reducing the manufacturing cost of the battery cell 100. Specifically, the busbar and the conductive element 150 can be made of aluminum. On the negative electrode side of the battery cell 100, the second electrode portion 143 of the negative electrode can be made of aluminum, and the first electrode portion 142 of the negative electrode can be made of copper. That is, it is not necessary to use copper as the negative electrode. The negative electrode is formed by a combination of copper and aluminum. This can meet the electrical connection requirements between the negative electrode and the conductive element 150 and the electrode assembly 120, and also save copper usage, thereby reducing manufacturing costs.

[0078] like Figure 7 As shown, further, along the first direction Z, the orthographic projection of the second inclined surface 132 on the electrode assembly 120 and the orthographic projection of the first pole portion 142 on the electrode assembly 120 at least partially coincide; and / or, the orthographic projection of the second inclined surface 132 on the electrode assembly 120 and the orthographic projection of the second pole portion 143 on the electrode assembly 120 at least partially coincide. Thus, when the pole 140 is subjected to an external force in a direction away from the electrode assembly 120, the second inclined surface 132 can provide a reaction force to the pole 140 through the seal 160. This reaction force can offset a portion of the external force, thereby reducing the stress at the connection point (i.e., the composite interface 144) between the first pole portion 142 and the second pole portion 143, and thus helping to improve the reliability of the pole 140.

[0079] like Figure 5 , Figure 7 and Figure 8 As shown, the electrode post 140 further has a composite interface 144 formed by the connection of the first electrode post portion 142 and the second electrode post portion 143, and the seal 160 also has a first end face 163 disposed near the electrode assembly 120; along the first direction Z, at least a portion of the first end face 163 is disposed near the second surface 1421 relative to the composite interface 144.

[0080] Understandably, for the sake of convenience, we will use the following terms here: Figure 7 and Figure 8 Taking the shown state as an example, "at least a portion of the first end face 163 is positioned close to the second surface 1421 relative to the composite interface 144" can be understood as at least a portion of the first end face 163 being positioned 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.

[0081] like Figure 2 , Figure 7 , Figure 12 and Figure 13As shown, the battery cell 100 further includes a first insulating member 170 located within the housing 110 and surrounding the terminal post 140. The first insulating member 170 includes a first insulating portion 171 and a second insulating portion 172 connected to each other. The first insulating portion 171 is located on the side of the end cap 130 near the electrode assembly 120. The second insulating portion 172 protrudes from the side of the first insulating portion 171 away from the electrode assembly 120. The second insulating portion 172 is inclined relative to the first direction Z. At least a portion of the second insulating portion 172 is received in the mounting through hole 131. The second insulating portion 172 abuts against the side of the seal 160 near the electrode assembly 120, and the second insulating portion 172 is connected to the first inclined surface 141 and the second inclined surface 132 respectively.

[0082] Understandably, without the need for a radially extending support portion as in related technologies, the second insulating portion 172 of the first insulating member 170 abuts against the side of the seal 160 near the electrode assembly 120, thereby restricting the movement of the seal 160 toward the electrode assembly 120, thus enhancing the stability of the seal 160. Furthermore, it can work together with the first inclined surface 141 and the second inclined surface 132 to limit and compress the seal 160, thereby helping to improve sealing reliability.

[0083] like Figure 1 as well as Figures 11 to 13 As shown, the battery cell 100 further includes a second insulating member 180 surrounding the terminal post 140. The second insulating member 180 includes a third insulating portion 181. 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 flange 134 is provided with a mounting through hole 131. 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 terminal post 140, the first conductive portion 151 and the second conductive portion 152 surround to form a first receiving groove 1504. At least a portion of the third insulating portion 181 is received in the first receiving groove 1504. The third insulating portion 181 has a second receiving groove 1811. The end of the flange 134 away from the cover plate 133 is received in the second receiving groove 1811. In this way, insulation between the terminal post 140 and the flange 134, as well as insulation between the conductive element 150 and the flange 134, can be achieved through the third insulating part 181, thereby reducing the risk of short circuit in the battery cell 100. This improves the safety of the battery cell 100.

[0084] like Figure 2 , Figure 9 and Figure 13As shown, the third insulating portion 181 further includes a first insulating section 1812, a second insulating section 1813, and a third insulating section 1814. The second insulating section 1813 is connected between the first insulating section 1812 and the third insulating section 1814, and the first insulating section 1812, the second insulating section 1813, and the third insulating section 1814 enclose to form a second receiving groove 1811. The first insulating section 1812 abuts against the side of the seal 160 away from the electrode assembly 120, and the first insulating section 1812 is connected to the flange 134 and the pole post 140, respectively. In this way, the first insulating section 1812 can restrict the movement of the seal 160 away from the electrode assembly 120, and can cooperate with the first inclined surface 141 and the second inclined surface 132 to better limit and compress the seal 160, thereby helping to improve the sealing reliability.

[0085] like Figure 2 as well as Figures 14 to 16 As shown, in a specific embodiment, the flange 134 includes a first flange portion 1341 and a second flange portion 1342. The first flange portion 1341 is connected to the second flange portion 1342 and the cover plate 133, respectively. The first flange portion 1341 is inclined relative to the first direction Z, and the second flange portion 1342 is bent relative to the first flange portion 1341 towards the electrode assembly 120. Both the second flange portion 1342 and the first flange portion 1341 are received in the second receiving groove 1811, and the second flange portion 1342 abuts against the side of the seal 160 away from the electrode assembly 120. In this way, the second flange portion 1342 facilitates the positioning of the seal 160 during the assembly process and can limit the possibility of the seal 160 moving away from the electrode assembly 120, thereby improving the stability of the seal 160.

[0086] like Figure 13 As shown, in another specific embodiment, the entire protrusion of the flange 134 is provided on the side of the cover plate 133 away from the electrode assembly 120. At this time, the first insulating section 1812 of the third insulating part 181 abuts against the side of the seal 160 away from the electrode assembly 120, which can also achieve the effect of positioning and limiting the seal 160.

[0087] like Figures 8 to 10 as well as Figure 13 As shown, the seal 160 further has a second end face 164 disposed away from the electrode assembly 120, the first insulating segment 1812 abuts against the second end face 164, and the vertical distance L4 between the first end face 163 and the second end face 164 satisfies: 1mm≤L4≤2.5mm.

[0088] For example, L4 can be any value from 1mm, 1.1mm, 1.25mm, 1.5mm, 1.6mm, 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.

[0089] Understandably, if L4 is too small, it can easily lead to insufficient sealing reliability, thus failing to achieve effective sealing; if L4 is too large, it is necessary to increase the dimension H3 of the flange 134 along the first direction Z, thereby affecting the energy density of the battery cell 100. By controlling L4 within the range of 1mm to 2.5mm, it is helpful to improve the sealing reliability of the seal 160 and also to improve the energy density of the battery cell 100.

[0090] like Figure 10 and Figure 13 As shown, further, the dimension H3 of the flange 134 along the first direction Z satisfies: 0.5mm≤H3≤2mm.

[0091] For example, H3 can be any value from 0.5mm, 0.55mm, 0.6mm, 0.62mm, 0.65mm, 1mm, 1.1mm, 1.2mm, 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.

[0092] Understandably, if H3 is too small, it will affect the area of ​​the second inclined surface 132, thus affecting the sealing reliability; if H3 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 H3 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.

[0093] like Figure 10 and Figure 13 As shown, further, the thickness L3 of the flange 134 satisfies: 0.8mm≤L2≤1.5mm.

[0094] For example, L2 can be any value from 0.8mm, 0.81mm, 0.85mm, 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.

[0095] Understandably, if L2 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 L2 is too large, it will easily cause dimensional redundancy, thus affecting the energy density of the battery cell 100. By controlling L2 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.

[0096] like Figure 10 and Figure 13 As shown, further, the dimension H4 of the cover plate 133 along the first direction Z satisfies: 1mm≤H4≤2.5mm.

[0097] For example, H4 can be any value from 1mm, 1.1mm, 1.25mm, 1.5mm, 1.55mm, 1.6mm, 1.8mm, 1.85mm, 1.9mm, 2mm, 2.3mm, 2.5mm, etc., or any value from a range of any two of them, without any specific limitation here.

[0098] Understandably, if H4 is too small, the cover plate 133 will lack sufficient strength, making it prone to deformation under the internal pressure of the casing 110, thus affecting the electrical performance of the battery cell 100. If H4 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 H4 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 conductive element 150 and the electrode assembly 120, thereby improving the electrical performance of the battery cell 100. It also helps to reduce the space occupied by the cover plate 133, thereby helping to improve the energy density of the battery cell 100.

[0099] like Figure 7 and Figure 10 As shown, further, when the first acute angle α1 and the second acute angle α2 are equal, the first inclined plane 141 and the second inclined plane 132 are perpendicular to each other, and the perpendicular distance L3 between them satisfies: 0.7mm≤L3≤1.5mm.

[0100] For example, L3 can be any value from 0.7mm, 0.72mm, 0.75mm, 0.8mm, 0.85mm, 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.

[0101] 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 H3 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.

[0102] like Figure 8 , Figure 9 as well as Figure 15 and Figure 16 As shown, further, the outer periphery of the pole post 140 is provided with a relief groove 145 communicating with the mounting through hole 131. The relief groove 145 communicates with the first receiving groove 1504. The first insulating section 1812 is received in the relief groove 145. At least a portion of the seal 160 is located between the first insulating section 1812 and the first flange 1341. The first side 18121 of the first insulating section 1812 facing the seal 160 abuts against the third inclined surface 161, and the first flange 1341 abuts against the second side 13411 of the first flange 160 facing the seal 160. In this way, the first insulating section 1812 and the first flange 1341 can be tightly fitted to the seal 160, thereby helping to improve the sealing reliability. Furthermore, the first insulating section 1812 achieves insulation between the pole post 140 and the second flange 1342, thereby reducing the risk of short circuit at this point.

[0103] like Figures 14 to 16 As shown, the second insulating member 180 further includes a fourth insulating portion 182 connected to the third insulating portion 181. The fourth insulating portion 182 is disposed around the third insulating portion 181 and is located between the second conductive portion 152 and the cover plate 133. In this way, insulation between the second conductive portion 152 and the cover plate 133 is achieved by the fourth insulating portion 182, thereby reducing the risk of short circuit.

[0104] like Figure 1 , Figure 13 and Figure 16 As shown, in a specific embodiment, the battery cell 100 also has a second direction X perpendicular to the first direction Z. The fourth insulating portion 182 extends along the second direction X. It can be understood that the fourth insulating portion 182 is arranged in a straight shape. The fourth insulating portion 182 includes a body segment 1821 and an extension segment 1822. The body segment 1821 is located between the second conductive portion 152 and the cover plate 133. Along the second direction X, the extension segment 1822 is connected to the side of the body segment 1821 away from the third insulating portion 181.

[0105] It is understood that the body section 1821 can achieve insulation between the second conductive part 152 and the cover plate 133, and the extension section 1822 can provide creepage distance between the second conductive part 152 and the cover plate 133, thereby reducing the risk of short circuit.

[0106] like Figure 7 and Figure 9 As shown, in another specific embodiment, the extension segment 1822 is connected to the side of the body segment 1821 away from the cover plate 133, and the extension segment 1822 is arranged around the second conductive part 152. This allows the extension segment 1822 to cover the outer periphery of the second conductive part 152, and also reduces the risk of short circuit.

[0107] Furthermore, the body segment 1821 is provided with a buffer cavity. The buffer cavity enables the body segment 1821 to have elastic buffering capacity, which can absorb the external impact force received by the conductive component 150 and reduce the risk of the body segment 1821 cracking due to external impact force.

[0108] like Figure 1 , Figure 2 and Figure 6 As shown, by way of example, the battery cell 100 also includes an adapter 190 located within the housing 110. The adapter 190 is located between the terminal post 140 and the electrode assembly 120, and is electrically 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.

[0109] Of course, in the above example, the electrode post 140 can also be directly electrically connected to the electrode assembly 120 without the adapter 190, and no specific limitation is made here.

[0110] 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.

[0111] 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, with the electrode tabs including a positive electrode tab and a negative electrode tab. The electrode body is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet, and the material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive 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.

[0112] 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.

[0113] It should be noted that the selection of materials related to the battery cell 100 provided in this embodiment is as follows: For example, the material of the end cap 130 and / or the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0114] For example, the materials of the adapter 190, the conductive part 150, the terminal post 140, and the bus can be selected from metallic conductive materials (such as copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (such as carbon-based materials, superconductors, semiconductors, etc.), without specific limitations.

[0115] For example, on the negative electrode side of the battery cell 100, when the negative electrode post includes a first electrode post portion 142 and a second electrode post portion 143, the materials of the adapter 190 and the first electrode post portion 142 can be copper, while the materials of the second electrode post portion 143, the conductive element 150, and the busbar can be aluminum.

[0116] For example, on the positive electrode side of the battery cell 100, the materials of the adapter 190, the positive electrode post, the conductive part 150, and the busbar can all be aluminum, without specific limitations.

[0117] For example, the materials of the first insulating element 170 and / or the second insulating element 180 may be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0118] 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.

[0119] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including a busbar and a battery cell 100 as described in any of the above embodiments. The busbar is welded to the second conductive portion 152 of the battery cell 100 to enable electrical connection between the busbar and the battery cell.

[0120] 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.

[0121] 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.

[0122] 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, Applied to a battery pack having a busbar, the battery cell having a first orientation (Z) and comprising: Casing (110); An electrode assembly (120) is disposed within the housing (110); An end cap (130) is connected to the housing (110) and is provided with a mounting through hole (131). The electrode post (140) is inserted through the mounting through hole (131) and is insulated from the end cap (130). The electrode post (140) is electrically connected to the electrode assembly (120). A conductive element (150) is located on the side of the end cap (130) away from the electrode assembly (120) and is insulated from the end cap (130). The conductive element (150) includes a first conductive part (151) and a second conductive part (152). The first conductive part (151) is electrically connected to the pole post (140) and the second conductive part (152) respectively. The first conductive part (151) is located between the pole post (140) and the second conductive part (152). The second conductive part (152) has a larger dimension along the first direction (Z) than the first conductive part (151) along the first direction (Z). The second conductive part (152) is used for welding to the busbar.

2. The battery cell according to claim 1, characterized in that, The first conductive part (151) has a groove (1511) on the side away from the electrode assembly (120), the groove (1511) is connected to the mounting through hole (131), and along the first direction (Z), the pole post (140) has a first surface (1431) disposed away from the electrode assembly (120), the first surface (1431) is not disposed beyond the groove (1511).

3. The battery cell according to claim 2, characterized in that, The settling tank (1511) has a bottom (15111), and the bottom (15111) is welded to the outer periphery of the pole (140) to form a weld (1512), and the entire weld (1512) is contained within the settling tank (1511).

4. The battery cell according to claim 3, characterized in that, Along the first direction (Z), the first surface (1431) is flush with the bottom of the groove (15111).

5. The battery cell according to claim 1, characterized in that, The first conductive part (151) is disposed around the pole post (140) and the first conductive part (151) is in contact with the outer peripheral side of the pole post (140); the second conductive part (152) is disposed around the first conductive part (151) and the second conductive part (152) is fixedly connected to the outer peripheral side of the first conductive part (151).

6. The battery cell according to claim 1, characterized in that, The conductive element (150) includes a plurality of conductive bodies (1501), each of the conductive bodies (1501) including a first conductive part (151) and a second conductive part (152), and the plurality of conductive bodies (1501) are arranged at intervals along the circumference of the pole (140).

7. The battery cell according to claim 6, characterized in that, The battery cell also has a second direction (X) and a third direction (Y). The first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other. There are two conductive bodies (1501). The two conductive bodies (1501) are spaced apart along the second direction (X) and form a separation gap (1502). The extension direction of the separation gap (1502) is parallel to the third direction (Y).

8. The battery cell according to any one of claims 1 to 7, characterized in that, The battery cell also includes a sealing element (160) surrounding the terminal post (140), the entire sealing element (160) being received within the mounting through hole (131). The outer periphery of the terminal post (140) has a first inclined surface (141), the hole wall of the mounting through hole (131) has a second inclined surface (132), the inner periphery of the sealing element (160) has a third inclined surface (161) that fits against the first inclined surface (141), and the outer periphery of the sealing element (160) has a third inclined surface (161) that fits against the second inclined surface (132). The fourth inclined surface (162) of the electrode post (140) has a second surface (1421) disposed near the electrode assembly (120). The angle between the first inclined surface (141) and the second surface (1421) is a first acute angle, the angle between the second inclined surface (132) and the second surface (1421) is a second acute angle, the angle between the third inclined surface (161) and the second surface (1421) is a third acute angle, and the angle between the fourth inclined surface (162) and the second surface (1421) is a fourth acute angle.

9. The battery cell according to claim 8, characterized in that, The first acute angle, the second acute angle, the third acute angle, and the fourth acute angle are all equal.

10. The battery cell according to claim 8, characterized in that, 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 second electrode post portion (143) is electrically connected to the first conductive portion (151). The first inclined surface (141) is formed by the entire outer peripheral side of the first electrode post portion (142) and at least a portion of the outer peripheral side of the second electrode post portion (143).

11. The battery cell according to claim 10, characterized in that, Along the first direction (Z), the orthographic projection of the second 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; and / or, the orthographic projection of the second 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.

12. The battery cell according to claim 10, characterized in that, The electrode post (140) has a composite interface (144) formed by connecting the first electrode post portion (142) and the second electrode post portion (143), and the seal (160) also has a first end face (163) disposed near the electrode assembly (120); along the first direction (Z), at least a portion of the first end face (163) is disposed near the second surface (1421) relative to the composite interface (144).

13. The battery cell according to claim 8, characterized in that, The battery cell also includes a first insulating member (170) located inside the housing (110) and surrounding the terminal post (140). The first insulating member (170) includes a first insulating portion (171) and a second insulating portion (172) connected together. The first insulating portion (171) is located on the side of the end cap (130) near the electrode assembly (120). The second insulating portion (172) protrudes from the side of the first insulating portion (171) away from the electrode assembly (120). The second insulating portion (172) is inclined relative to the first direction (Z). At least a portion of the second insulating portion (172) is received in the mounting through hole (131). The second insulating portion (172) abuts against the side of the seal (160) near the electrode assembly (120). The second insulating portion (172) is connected to the first inclined surface (141) and the second inclined surface (132) respectively.

14. The battery cell according to claim 8, characterized in that, The battery cell also includes a second insulating member (180) surrounding the electrode post (140), the second insulating member (180) including a third insulating portion (181), the end cap (130) including a cover plate (133) and a flange (134), the cover plate (133) being connected to the housing (110) and the flange (134) respectively, the flange (134) having the mounting through hole (131), at least a portion of the flange (134) protruding from the cover plate (133) away from the electrode assembly (110). On one side of 20), the flange (134) is inclined relative to the first direction (Z), the pole post (140), the first conductive part (151) and the second conductive part (152) surround to form a first receiving groove (1504), at least a portion of the third insulating part (181) is received in the first receiving groove (1504); the third insulating part (181) has a second receiving groove (1811), and one end of the flange (134) away from the cover plate (133) is received in the second receiving groove (1811).

15. The battery cell according to claim 14, characterized in that, The third insulating part (181) includes a first insulating section (1812), a second insulating section (1813) and a third insulating section (1814). The second insulating section (1813) is connected between the first insulating section (1812) and the third insulating section (1814). The first insulating section (1812), the second insulating section (1813) and the third insulating section (1814) surround to form the second receiving groove (1811). The first insulating section (1812) abuts against the side of the sealing member (160) away from the electrode assembly (120). The first insulating section (1812) is connected to the flange (134) and the pole post (140) respectively.

16. The battery cell according to claim 15, characterized in that, The flange (134) includes a first flange portion (1341) and a second flange portion (1342). The first flange portion (1341) is connected to the second flange portion (1342) and the cover plate (133) respectively. The first flange portion (1341) is inclined relative to the first direction (Z). The second flange portion (1342) is bent relative to the first flange portion (1341) in a direction close to the electrode assembly (120). The second flange portion (1342) and the first flange portion (1341) are both received in the second receiving groove (1811), and the second flange portion (1342) abuts against the side of the seal (160) away from the electrode assembly (120).

17. The battery cell according to claim 16, characterized in that, The outer periphery of the pole post (140) is provided with a relief groove (145) communicating with the mounting through hole (131). The relief groove (145) is communicating with the first receiving groove (1504). The first insulating section (1812) is received in the relief groove (145). At least a portion of the seal (160) is located between the first insulating section (1812) and the first flange (1341). The first insulating section (1812) abuts against the third inclined surface (161) on the first side (18121) facing the seal (160). The first flange (1341) abuts against the fourth inclined surface (162) on the second side (13411) facing the seal (160).

18. The battery cell according to claim 14, characterized in that, The second insulating member (180) further includes a fourth insulating part (182) connected to the third insulating part (181), the fourth insulating part (182) being disposed around the third insulating part (181) and being disposed between the second conductive part (152) and the cover plate (133).

19. The battery cell according to claim 18, characterized in that, The battery cell also has a second direction (X) perpendicular to the first direction (Z), and the fourth insulating portion (182) extends along the second direction (X). The fourth insulating portion (182) includes a body segment (1821) and an extension segment (1822). The body segment (1821) is located between the second conductive portion (152) and the cover plate (133). Along the second direction (X), the extension segment (1822) is connected to the side of the body segment (1821) away from the third insulating portion (181).

20. The battery cell according to claim 19, characterized in that, The main body section (1821) is provided with a buffer cavity.

21. A battery pack, characterized in that, It includes a busbar and a battery cell according to any one of claims 1 to 20, wherein the busbar is welded to the second conductive portion (152) of the battery cell.

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