Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, a shell, a pole assembly and an insulating piece. The shell is provided with a containing cavity and an opening, the opening is communicated with the containing cavity, and the containing cavity contains the electrode assembly. The pole assembly is installed on the shell and comprises a pressing part, a pole and the insulating piece. The pole penetrates through the opening, and the insulating piece at least comprises a first insulating part which is arranged between the pressing part and the shell. One end of the pole in the shell is electrically connected with the electrode assembly, the pressing part is connected with the pole, the pressing part presses the first insulating part in the direction close to the shell, and the size e of the pressing part in the radial direction of the opening satisfies 0.5 mm <= e <= 23 mm. In the battery monomer, the riveting strength of the pole assembly can be improved, the occupied space of the pressing part can be reduced, and the miniaturization of the pole assembly is facilitated.

Description

Technical Field

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

[0002] In related technologies, a battery cell includes a casing, a terminal assembly, and an electrode assembly located inside the casing. The terminal assembly is mounted on the casing and electrically connected to the electrode assembly, facilitating electrical connection between the battery cell and other electrical components. However, during long-term use of the battery cell, the connection area between the terminal assembly and the casing may be affected by external forces, vibrations, or changes in internal pressure, leading to insufficient connection strength or reduced structural reliability. Summary of the Invention

[0003] This application provides a battery cell, a battery device, and an electrical device to solve at least one of the aforementioned technical problems.

[0004] In a first aspect, an embodiment of this application provides a battery cell comprising: Electrode assembly; The housing has a receiving cavity and an opening, the opening being connected to the receiving cavity, and the receiving cavity accommodating the electrode assembly; A terminal assembly is mounted on the housing. The terminal assembly includes a clamping part, a terminal, and an insulating member. The terminal passes through the opening. The insulating member includes at least a first insulating portion, which is at least located between the clamping part and the housing. The electrode post is connected to the electrode assembly, the clamping part is connected to the electrode post, and the clamping part clamps the first insulating part in a direction close to the outer shell; The dimension e of the clamping part in the radial direction of the opening satisfies 0.5 mm ≤ e ≤ 23 mm.

[0005] In the aforementioned battery cell, by satisfying the dimension e of the clamping part in the radial direction of the opening as 0.5 mm ≤ e ≤ 23 mm, when 0.5 mm ≤ e, the clamping part can provide sufficient clamping force, thereby improving the riveting strength of the terminal assembly. When e ≤ 23 mm, the space occupied by the clamping part can be reduced, which is beneficial to the miniaturization of the terminal assembly.

[0006] In some embodiments, the dimension e of the clamping part in the radial direction of the opening satisfies 0.5 mm ≤ e ≤ 10 mm.

[0007] In some embodiments, the pole post includes a first column and a second column arranged coaxially, the second column passing through the opening, the first column connecting the second column and the clamping part, and the outer diameter of the first column being less than or equal to the outer diameter of the second column.

[0008] In some embodiments, the clamping part includes a pressure ring and a first flange, the first insulating part is disposed between the pressure ring and the outer shell, the first flange is integrally connected to the circumferential outer side of at least one of the first column and the second column, and the first flange is clamped to the first insulating part by the pressure ring; The dimension b1 of the first flange in the radial direction of the opening satisfies 0.5 mm ≤ b1 ≤ 5 mm.

[0009] In some embodiments, the dimension b1 of the first flange in the radial direction of the opening satisfies 0.5 mm ≤ b1 ≤ 3 mm.

[0010] In some embodiments, the pressure ring includes a first pressure ring located outside the receiving cavity, and the first flange is connected to the circumferential outer side of the first column, the first flange pressing the first insulating portion against the first pressure ring.

[0011] In some embodiments, the outer diameter of the first column is smaller than the outer diameter of the second column, the first column, the second column and the first flange portion together form a first notch, the first pressure ring includes a first body and a first riveting portion connected to each other, the first body is connected to the side of the first riveting portion away from the second column, and at least a portion of the first riveting portion is embedded in the first notch.

[0012] In some embodiments, the portion of the first riveted part embedded in the first notch is an embedded section, and the thickness t2 of the embedded section satisfies 0.4 mm ≤ t2 ≤ 2 mm.

[0013] In some embodiments, the thickness t3 of the first body satisfies 0.4 mm ≤ t3 ≤ 3 mm.

[0014] In some embodiments, the first body and the first riveting part are connected by a first chamfer structure or a first rounded corner structure, and the portion of the first flange facing the first chamfer structure or the first rounded corner structure is provided with a second chamfer structure or a second rounded corner structure. The first chamfer structure and the second chamfer structure are connected in a cooperative manner, or the first rounded corner structure and the second rounded corner structure are connected in a cooperative manner.

[0015] In some embodiments, the thickness of the first flange is t11, the dimension of the first chamfer structure in the radial direction of the opening is L1, and the maximum thickness of the first chamfer structure is L2, wherein 0.2 t11≤L1≤0.7 t11, 0.2 t11≤L2≤0.7 t11; The radius of the first rounded corner structure is r1, where 0.2 t11≤r1≤0.7 t11.

[0016] In some embodiments, the thickness t11 of the first flange portion satisfies 0.5 mm ≤ t1 ≤ 3 mm.

[0017] In some embodiments, the first pressure ring is a circular ring of equal thickness or the thickness difference between the thickest and thinnest parts of the first pressure ring is ±0.03 mm to ±0.2 mm.

[0018] In some embodiments, the pressure ring includes a second pressure ring, at least a portion of which passes through the opening, and the first flange is connected to the circumferential outer side of the first column and / or the second column, the first flange pressing the first insulating portion against the second pressure ring.

[0019] In some embodiments, the second pressure ring includes a second body, a second riveting portion, and a third riveting portion. The second body passes through the opening, and the second riveting portion and the third riveting portion are respectively connected to both ends of the second body. The second riveting portion is located on the circumferential outer side of the second body, and the third riveting portion is located on the circumferential inner side of the second body. The first flange portion is pressed against the third riveting portion, so that the third riveting portion, through the second body, drives the second riveting portion to press the first insulating portion.

[0020] In some embodiments, the thickness t12 of the first flange portion satisfies 0.4 mm ≤ t12 ≤ 3 mm.

[0021] In some embodiments, the clamping part is a second flange integrally connected to the outer circumferential side of at least one of the first column and the second column.

[0022] In some embodiments, the pole post further includes a limiting portion connected to the circumferential outer side of the end of the second post away from the first post; The insulating component further includes a second insulating portion, which separates the outer shell from the electrode assembly, and the limiting portion presses the second insulating portion against the inner wall of the outer shell; And / or the pole assembly further includes a seal, the limiting portion pressing the seal against the inner wall of the housing.

[0023] In some embodiments, the second insulating portion is connected to the first insulating portion via the seal, and the second insulating portion and the seal are integrally formed or separately disposed.

[0024] In some embodiments, the second insulating portion and the first insulating portion are integrally formed.

[0025] In some embodiments, the first insulating portion and the second insulating portion are made of the same or different materials, and the material of the seal is different from the material of the first insulating portion or the second insulating portion.

[0026] In some embodiments, the seal is connected to the circumferential outer side of the second column.

[0027] In some embodiments, the outer radial dimension of the axial projection of the seal is d6, the diameter of the opening is d3, and the outer diameter of the second column is d2, wherein d2+0.8 mm≤d3≤d6-2 mm.

[0028] In some embodiments, the limiting portion includes a third column and a fourth column, the second column, the third column and the fourth column are coaxially arranged, the third column is connected between the second column and the fourth column, the third column protrudes from the fourth column in the height direction, the third column presses a portion of the sealing member against the inner wall of the housing, and the fourth column presses a portion of the second insulating portion against the inner wall of the housing.

[0029] In some embodiments, the seal covers the radial gap between the second insulating portion and the third column.

[0030] In some embodiments, the outer radial dimension of the axial projection of the seal is d6, the diameter of the opening is d3, and the outer diameter of the third column is d4, wherein d3+2 mm ≤ d4 ≤ d6.

[0031] In some embodiments, the seal is spaced from the second insulating portion in the radial direction of the opening to form a clearance space.

[0032] In some embodiments, a first limiting structure is provided on the surface of the first insulating portion facing the pressing portion, and a second limiting structure is provided on the surface of the pressing portion facing the first insulating portion. The first limiting structure and the second limiting structure are connected to limit the relative position between the first insulating portion and the pressing portion.

[0033] In some embodiments, the first limiting structure includes one of a protrusion and a groove, and the second limiting structure includes the other of the protrusion and the groove, wherein at least a portion of the protrusion is embedded in the groove.

[0034] In some embodiments, the protrusion includes an annular protrusion and / or a plurality of protrusion segments spaced apart along the circumferential direction of the pole post, and the groove includes an annular groove and / or a plurality of groove segments adapted to the plurality of protrusion segments.

[0035] In some embodiments, the wall thickness of the protrusion is less than the width of the groove.

[0036] In some embodiments, the height of the protrusion is greater than the depth of the groove.

[0037] In some embodiments, the volume of the protrusion is 0.8 to 1.5 times the volume of the groove.

[0038] In some embodiments, the terminal post includes a welding portion, the battery cell further includes a current collector, the electrode assembly includes a tab, the current collector is connected between the welding portion and the tab, and the welding portion is located outside or inside the receiving cavity.

[0039] In some embodiments, the welding portion is located outside the receiving cavity, and the pole post further includes a first column and a second column arranged coaxially. The second column passes through the opening, and the first column connects the second column and the clamping portion. The pole post is provided with a mounting hole that penetrates the first column and the second column. The welding portion is connected to the wall of the mounting hole corresponding to the first column, and the connecting portion of the collector plate extends into the mounting hole and is connected to the welding portion.

[0040] In some embodiments, the connecting portion forms a first cavity, the first cavity satisfying at least one of the following conditions: The axial dimension h2 of the opening satisfies 0 < h2 ≤ 5 mm; The radial dimension d7 of the opening satisfies 1mm≤d7≤20mm; The ratio of the dimension h2 in the axial direction of the opening to the dimension h3 in the axial direction of the pole is T = h2 / h3, where 0 < T ≤ 0.95.

[0041] In some embodiments, the welded portion has at least one first groove on the surface opposite to the manifold.

[0042] In some embodiments, the portion of the welded part corresponding to the first groove is a thinned portion, and the thickness t4 of the thinned portion satisfies 0.5 mm ≤ t4 ≤ 2 mm.

[0043] In some embodiments, the shape of the at least one first groove includes at least one of a circle, annulus, fan shape, and strip shape; The first grooves are arranged concentrically in a ring shape, the first grooves are arranged in a ring at intervals in a fan shape, and the first grooves are arranged radially in a strip shape.

[0044] In some embodiments, the welding part is located within the receiving cavity, and the pole post further includes a first column and a second column arranged coaxially, the second column passing through the opening, the first column connecting the second column and the clamping part, the pole post having a mounting hole penetrating the first column and the second column, and the welding part being connected to the mounting hole wall corresponding to the second column; The pole assembly further includes a sealing pin that connects at least a portion of the clamping portion and at least one of the first poles.

[0045] In some embodiments, the sealing pin covers at least a portion of the clamping portion and the first column.

[0046] In some embodiments, the clamping part is provided with a receiving groove, at least a portion of the sealing pin is received in the receiving groove, the opening edge of the receiving groove is provided with a second notch and / or the periphery of the surface of the sealing pin away from the welding part is provided with a third notch, the second notch, or the third notch, or the second notch and the third notch together form a first recess for welding.

[0047] In some embodiments, the clamping portion includes a first pressure ring and a first flange portion, the first insulating portion is disposed between the first pressure ring and the outer shell, the first flange portion is integrally connected to the circumferential outer side of the first column, the first flange portion clamps the first insulating portion through the first pressure ring, and the top of the first pressure ring protrudes from the top of the first flange portion to form the receiving groove.

[0048] In some embodiments, the first pressure ring has an opening of the receiving groove, and the first pressure ring has a third chamfer structure or a third rounded corner structure at the edge of the opening of the receiving groove. The third chamfer structure or the third rounded corner structure forms the second notch. The sealing nail has a fourth chamfer structure or a fourth rounded corner structure on the periphery of the surface away from the welded part, and the fourth chamfer structure or the fourth rounded corner structure forms the third notch.

[0049] In some embodiments, the height of the first pressure ring is greater than the height of the first flange, the height difference between the first pressure ring and the first flange is h1, the dimension of the third chamfer structure in the radial direction of the opening is L3, and the maximum thickness of the third chamfer structure is L4, wherein 0.5 h1≤L3≤h1, 0.5 h1≤L4≤h1; The radius of the third rounded corner structure is r2, 0.5 h1≤r2≤h1.

[0050] In some embodiments, the sealing pin covers the clamping part and the pole post, and the surface of the sealing pin away from the clamping part is provided with a second groove or a sixth notch.

[0051] In some embodiments, the thickness t5 of the portion of the sealing pin corresponding to the second groove or the sixth notch satisfies 0.5 mm ≤ t5 ≤ 2 mm.

[0052] In some embodiments, the sealing pin is located at the end of the mounting hole away from the welded portion and is connected to the first column.

[0053] In some embodiments, the sealing pin has a fourth notch on the periphery of its surface away from the welded portion, and / or the mounting hole has a fifth notch at the opening edge of one end away from the welded portion, the fourth notch, or the fifth notch, or the fourth notch and the fifth notch together forming a second recess for welding.

[0054] Secondly, embodiments of this application provide a battery device comprising a battery cell as described in any of the above embodiments.

[0055] Thirdly, embodiments of this application provide an electrical device that includes the battery device described in the above embodiments.

[0056] Additional aspects and advantages of this application will be set forth in the description which follows, or will become apparent from the description, or may be learned by practice of this application. Attached Figure Description

[0057] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a battery cell according to an embodiment of this application; Figure 3 and Figure 3a This is one of the cross-sectional schematic diagrams of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 4 and Figure 4a yes Figure 3 A magnified view of part A; Figure 5 and Figure 5a This is a second cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 6 This is the third cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 7 yes Figure 6 A magnified view of part B; Figure 8 This is the fourth cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 9 yes Figure 8 A magnified view of part C; Figure 10 This is the fifth cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 11 yes Figure 10 A magnified view of part D; Figure 12 This is the sixth cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 13 yes Figure 12 A magnified view of part E; Figure 14 This is the seventh cross-sectional schematic diagram of a battery cell when the compression ring is the first compression ring in the embodiments of this application; Figure 15 yes Figure 14 A magnified view of part F; Figure 16 This is a cross-sectional schematic diagram of a battery cell when the compression ring in the embodiments of this application is a second compression ring; Figure 17 and Figure 17a yes Figure 16 A magnified view of part of G; Figure 18 This is one of the cross-sectional schematic diagrams of a battery cell when the pressing part is the second flange part in the embodiments of this application; Figure 19 yes Figure 18 A magnified view of part of H; Figure 20 This is the second cross-sectional schematic diagram of a battery cell when the pressing part is the second flange part in the embodiment of this application; Figure 21 This is the third cross-sectional schematic diagram of a battery cell when the pressing part is the second flange part in the embodiment of this application; Figure 22 yes Figure 21 Enlarged view of part I; Figure 23 This is the fourth cross-sectional schematic diagram of a battery cell when the pressing part is the second flange part in the embodiments of this application; Figure 24 yes Figure 23 A magnified view of part J; Figures 25 to 31 This is a schematic diagram of the pole structure according to an embodiment of this application.

[0058] Explanation of key component reference numerals: 10 battery cells; 11. Pole post assembly, 12. Housing, 13. Electrode assembly, 14. 111 pole post, 112 pressing part, 113 insulating part, 114 sealing part, 115 sealing nail, 116 first recess, 117 second recess; 121 housing, 122 cover plate, 123 receiving cavity, 1231 clearance space, 124 opening; First column 1111, second column 1112, limiting part 1113, welding part 1114, first notch 1115, mounting hole 1116, first pressure ring 1121, first flange part 1122, second flange part 1123, second pressure ring 1124, second limiting structure 1125, first insulating part 1131, surrounding part 1131b, second insulating part 1132, second groove 1151, sixth notch 1152, fourth chamfer structure 1153, fourth rounded corner structure 1154; Third column 1113a, fourth column 1113b, first groove 1114a, brace welding area 1114b, first body 1121a, first riveting part 1121b, first chamfer structure 1121c, first rounded corner structure 1121d, third chamfer structure 1121e, third rounded corner structure 1121f, second chamfer structure 1122a, second rounded corner structure 1122b, second body 1124a, second riveting part 1124b, third riveting part 1124c, first limiting structure 1131a; Connecting part 141, first cavity 142. Detailed Implementation

[0059] 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 the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0060] Firstly, please refer to Figures 1 to 24 The battery cell 10 provided in this application includes an electrode assembly 13, a housing 12, and a terminal assembly 11. The housing 12 has a receiving cavity 123 and an opening 124, the opening 124 communicating with the receiving cavity 123, and the receiving cavity 123 accommodating the electrode assembly 13. The terminal assembly 11 is mounted on the housing 12, and the terminal assembly 11 includes a clamping part 112, a terminal 111, and an insulating member 113. The terminal 111 passes through the opening 124, and the insulating member 113 includes at least a first insulating portion 1131, which is at least disposed between the clamping part 112 and the housing 12.

[0061] The electrode post 111 is connected to the electrode assembly 13, and the clamping part 112 is connected to the electrode post 111. The clamping part 112 clamps the first insulating part 1131 in the direction close to the outer shell 12.

[0062] The dimension e of the clamping part 112 in the radial direction of the opening 124 satisfies 0.5 mm ≤ e ≤ 23 mm.

[0063] In the aforementioned battery cell 10, by satisfying the dimension e of the clamping part 112 in the radial direction of the opening 124 as 0.5 mm ≤ e ≤ 23 mm, when 0.5 mm ≤ e, the clamping part 112 can provide sufficient clamping force, thereby improving the riveting strength of the terminal assembly 11. When e ≤ 23 mm, the space occupied by the clamping part 112 can be reduced, which is beneficial to the miniaturization of the terminal assembly 11.

[0064] In some embodiments, the electrode assembly 13 is a component in the battery cell 10 used for energy storage and energy conversion. In one embodiment, the electrode assembly 13 may include a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. The positive and negative electrode are spaced apart by the separator and formed into the electrode assembly 13 by winding, stacking, or other methods. The electrode assembly 13 is used to convert electrical energy into chemical energy during charging and discharging.

[0065] In one embodiment, the electrode assembly 13 further includes tabs, and the battery cell 10 further includes a current collector 14. The tabs are used to establish an electrical connection between the electrode assembly 13 and the current collector 14, which is connected to the terminal post 111 so that the current generated by the electrode assembly 13 can be transmitted to the terminal post 111 through the current collector 14, or that externally input current can be transmitted to the electrode assembly 13 through the terminal post 111 and the current collector 14.

[0066] The housing 12 is used to house and protect the electrode assembly 13. The housing 12 can be made of a metallic material, such as aluminum, aluminum alloy, or other materials with high strength. The housing 12 has a receiving cavity 123 and an opening 124. The receiving cavity 123 is formed inside the housing 12 for housing the electrode assembly 13. The opening 124 penetrates the housing 12 and communicates with the receiving cavity 123 to allow the electrode post assembly 11 to pass through, so that the electrode assembly 13 can be electrically connected to the external circuit of the battery cell 10 through the electrode post assembly 11.

[0067] In one embodiment, the housing 12 includes a housing 121 and a cover plate 122, which are connected to seal the receiving cavity 123. An opening 124 is provided on the cover plate 122 or the housing 121 for mounting the pole assembly 11. The housing 121 and the cover plate 122 can be connected by welding or other means to improve the sealing performance of the housing 12.

[0068] The electrode assembly 11 is mounted on the housing 12. The electrode assembly 11 is used to lead the electrical energy generated by the electrode assembly 13 to the outside of the housing 12, or to input external electrical energy into the electrode assembly 13.

[0069] The electrode assembly 11 includes a clamping part 112, an electrode 111, and an insulating member 113. The electrode 111 is used for current transmission. An opening 124 passes through the electrode 111, and one end of the electrode 111 located inside the housing 12 is electrically connected to the electrode assembly 13, allowing the electrode assembly 13 to communicate with an external circuit through the electrode 111. The electrode 111 is connected to the clamping part 112, which clamps the first insulating part 1131 along the direction close to the housing 12. This clamping action ensures that the first insulating part 1131 is in close contact with the housing 12 and the electrode 111. Simultaneously, the clamping part 112 can rivet the electrode assembly 11 to the housing 12, ensuring stable installation of the electrode assembly 11 on the housing 12. The first insulating part 1131 is at least located between the clamping part 112 and the housing 12, insulating the clamping part 112 from the housing 12 and preventing direct contact between the clamping part 112 and the housing 12 that could cause a short circuit. In one embodiment, a first insulating portion 1131 is further disposed between the terminal post 111 and the outer casing 12, thereby insulating the terminal post 111 and the outer casing 12 from each other and preventing a short circuit caused by direct contact between the terminal post 111 and the outer casing 12. In other embodiments, other insulating structures are provided between the terminal post 111 and the outer casing 12. The material of the first insulating portion 1131 includes, but is not limited to, plastic, rubber, or other materials with insulating properties.

[0070] In this embodiment, the dimension e of the clamping part 112 in the radial direction of the opening 124 satisfies 0.5 mm ≤ e ≤ 23 mm. The radial direction of the opening 124 includes a first direction extending from the center of the opening 124 toward the sidewall of the housing 12, and a second direction parallel to the first direction. Both the first and second directions are parallel to the X direction shown in the figure. The axial direction of the opening 124 includes the length direction of the opening 124 and a third direction parallel to the length direction of the opening 124. Both the length direction and the third direction of the opening 124 are parallel to the Z direction shown in the figure.

[0071] The dimension e of the clamping portion 112 in the radial direction of the opening 124 is used to characterize the coverage dimension of the clamping portion 112 in the radial direction of the opening 124. When 0.5 mm ≤ e, the clamping portion 112 can provide sufficient clamping force for the first insulating portion 1131 and can improve the riveting strength between the pole assembly 11 and the housing 12; when e ≤ 23 mm, the space occupied by the clamping portion 112 can be reduced, which is beneficial to the miniaturization of the pole assembly 11. In one embodiment, at least a portion of the clamping portion 112 is integrally formed with the pole 111, and at least a portion of the clamping portion 112 is formed by riveting deformation of a portion of the structure of the pole 111. During assembly, after the electrode post 111 passes through the opening 124 on the outer shell 12, the end of the electrode post 111 away from the electrode assembly 13 is subjected to punching, rolling, or extrusion, causing a portion of the material of the electrode post 111 to undergo plastic deformation along the radial direction of the opening 124 and form at least a part of the clamping part 112. The clamping part 112 presses against the first insulating part 1131 to achieve a fixed connection between the electrode post assembly 11 and the outer shell 12 and to clamp the first insulating part 1131. When e ≤ 23 mm, the uneven material deformation during riveting deformation caused by an excessively large radial coverage size of the clamping part 112 can be reduced, thereby reducing the risk of cracking of the clamping part 112.

[0072] In some examples, the dimension e of the clamping part 112 in the radial direction of the opening 124 is 0.5 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 23 mm, or other values ​​that are greater than or equal to 0.5 mm and less than or equal to 23 mm.

[0073] In one implementation, such as Figure 4 The first insulating portion 1131 may include a surrounding portion 1131b, which is connected to the portion of the first insulating portion 1131 located between the clamping portion 112 and the housing 12. The surrounding portion 1131b covers at least a portion of the circumferential outer side of the clamping portion 112, thereby increasing the insulation path between the clamping portion 112 and the housing 12, increasing the creepage distance between the clamping portion 112 and / or the pole 111 and the housing 12, thereby improving the insulation reliability between the clamping portion 112 and / or the pole 111 and the housing 12, and reducing the risk of leakage. In one embodiment, the clamping portion 112 and the first insulating portion 1131 may be continuous or discontinuously annular.

[0074] In some implementations, please refer to Figure 3 , Figure 3a and Figure 4 The dimension e of the clamping part 112 in the radial direction of the opening 124 satisfies 0.5 mm ≤ e ≤ 10 mm.

[0075] In this way, the clamping part 112 can provide sufficient clamping force, thereby improving the riveting strength of the pole assembly 11, while further reducing the space occupied by the clamping part 112, which is conducive to the miniaturization of the pole assembly 11.

[0076] In one embodiment, at least a portion of the clamping part 112 is integrally formed with the pole post 111, and the at least portion of the clamping part 112 is formed by riveting deformation of a portion of the structure of the pole post 111. When e ≤ 10 mm, the risk of cracking of the clamping part 112 can be further reduced, and the structural reliability of the clamping part 112 can be improved.

[0077] In some examples, the dimension e of the clamping part 112 in the radial direction of the opening 124 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or other values ​​that are greater than or equal to 0.5 mm and less than or equal to 10 mm.

[0078] In one embodiment, the dimension e of the clamping part 112 in the radial direction of the opening 124 satisfies 0.5 mm ≤ e ≤ 5 mm.

[0079] In some implementations, please refer to Figures 3 to 24 The pole post 111 includes a first post 1111 and a second post 1112 arranged coaxially. The second post 1112 has an opening 124. The first post 1111 connects the second post 1112 and the pressing part 112. The outer diameter of the first post 1111 is less than or equal to the outer diameter of the second post 1112.

[0080] In this way, the shape of pole post 111 can be flexibly selected according to actual needs.

[0081] In some embodiments, the pole post 111 has a columnar structure, with the first column 1111 and the second column 1112 coaxially arranged. The second column 1112 has an opening 124. In one embodiment, the first column 1111 connects the end of the second column 1112 located outside the receiving cavity 123 to the clamping part 112.

[0082] In one implementation, such as Figures 3 to 15 The outer diameter d1 of the first column 1111 is smaller than the outer diameter d2 of the second column 1112, forming a stepped structure between the first column 1111 and the second column 1112. This stepped structure can be used to limit the assembly position of other components of the pole post assembly 11. In one embodiment, such as... Figures 16 to 24 The outer diameter d1 of the first column 1111 is equal to the outer diameter d2 of the second column 1112. The first column 1111 and the second column 1112 can form a continuous columnar structure to simplify the processing and manufacturing of the pole column 111.

[0083] It should be noted that the second column 1112 passes through the opening 124, and the first column 1111 is located outside the outer shell 12. When the outer diameter d1 of the first column 1111 is equal to the outer diameter d2 of the second column 1112, the first column 1111 and the second column 1112 can form a continuous columnar structure. In this case, according to the relative positional relationship between the second column 1112 and the opening 124, the following two situations can be included: 1) A portion of the second column 1112 is located inside the outer shell 12, and a portion is located inside the opening 124, with the end of the second column 1112 flush with the end face of the opening 124 on the side away from the receiving cavity 123; 2) A portion of the second column 1112 is located inside the outer shell 12, and a portion is located outside the outer shell 12. In some embodiments, please refer to... Figures 3 to 17a The pressing part 112 includes a pressing ring and a first flange 1122. The first insulating part 1131 is disposed between the pressing ring and the outer shell 12. The first flange 1122 is integrally connected to the circumferential outer side of at least one of the first column 1111 and the second column 1112. The first flange 1122 presses the first insulating part 1131 through the pressing ring. The dimension b1 of the first flange 1122 in the radial direction of the opening 124 satisfies 0.5 mm ≤ b1 ≤ 5 mm.

[0084] In this way, the connection strength between the clamping part 112 and the pole post 111 can be improved, the processing difficulty of the pole post assembly 11 can be reduced, the clamping stability of the first insulating part 1131 can be improved, the riveting strength between the pole post assembly 11 and the outer shell 12 can be improved, and the risk of cracking of the first flange part 1122 can be reduced.

[0085] In some embodiments, the first flange 1122 is integrally connected to the outer circumferential direction of at least one of the first column 1111 and the second column 1112. During the processing of the pole post 111, the first flange 1122 can be formed by flanging one end of the pole post 111 to achieve riveting deformation. This eliminates the need for an additional connection structure between the first flange 1122 and at least one of the first column 1111 and the second column 1112, thereby improving the connection strength between the clamping part 112 and the pole post 111 and reducing the processing difficulty of the pole post assembly 11. The first flange 1122 extends outward from the outer circumferential direction of at least one of the first column 1111 and the second column 1112 and is connected to the pressure ring. The pressure ring can press the first insulating part 1131 in the direction close to the outer shell 12 under the pressing action of the first flange 1122, so that the first insulating part 1131 is in close contact with the outer shell 12 and the pole post 111.

[0086] In some embodiments, the first flange 1122 is integrally connected to the circumferential outer side of the first column 1111, such as... Figures 3 to 15As shown. In some embodiments, the first flange 1122 is integrally connected to the circumferential outer side of the first column 1111 and the second column 1112, such as... Figure 16 and Figure 17 As shown. In some embodiments, the first flange 1122 may be integrally connected to the circumferential outer side of the second column 1112.

[0087] The dimension b1 of the first flange portion 1122 in the radial direction of the opening 124 satisfies 0.5 mm ≤ b1 ≤ 5 mm. When 0.5 mm ≤ b1, the pressing area of ​​the first flange portion 1122 on the pressure ring can be increased, which can improve the pressing stability of the first insulating part 1131 and the riveting strength between the pole post assembly 11 and the outer shell 12. When b1 ≤ 5 mm, the local stress concentration caused by the excessive size of the first flange portion 1122 in the radial direction of the opening 124 during riveting deformation can be reduced, thereby reducing the risk of cracking of the first flange portion 1122.

[0088] In some examples, the dimension b1 of the first flange 1122 in the radial direction of the opening 124 is 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, or other values ​​greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0089] In some implementations, please refer to Figures 3 to 24 The dimension b1 of the first flange 1122 in the radial direction of the opening 124 satisfies 0.5 mm ≤ b1 ≤ 3 mm.

[0090] This further reduces the risk of cracking in the first flange 1122.

[0091] When b1≤3 mm, the local stress concentration caused by the excessive size of the first flange 1122 in the radial direction of the opening 124 during riveting deformation can be further reduced, thereby further reducing the risk of cracking of the first flange 1122.

[0092] In some examples, the dimension b1 of the first flange 1122 in the radial direction of the opening 124 is 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, or other values ​​that are greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0093] In some implementations, please refer to Figures 3 to 15 The pressure ring includes a first pressure ring 1121, which is located outside the receiving cavity 123. A first flange 1122 is connected to the circumferential outer side of the first column 1111. The first flange 1122 presses the first insulating part 1131 through the first pressure ring 1121.

[0094] This improves the utilization rate of the internal space of the battery cell 10.

[0095] In some embodiments, the first pressure ring 1121 is located outside the receiving cavity 123, which can reduce the space occupied by the first pressure ring 1121 inside the receiving cavity 123 and improve the utilization rate of the internal space of the battery cell 10. The first flange portion 1122 is connected to the first post 1111 and applies a pressing force to the first insulating portion 1131 through the first pressure ring 1121, so that the first insulating portion 1131 is in close contact with the outer shell 12 and the terminal post 111.

[0096] In some implementations, please refer to Figures 3 to 4a The outer diameter of the first column 1111 is smaller than the outer diameter of the second column 1112. The first column 1111, the second column 1112 and the first flange 1122 together form a first notch 1115. The first pressure ring 1121 includes a first body 1121a and a first riveting part 1121b that are connected to each other. The first body 1121a is connected to the side of the first riveting part 1121b away from the second column 1112. At least a part of the first riveting part 1121b is embedded in the first notch 1115.

[0097] This improves the structural reliability and assembly consistency of the pole assembly 11.

[0098] In some embodiments, the outer diameter of the first column 1111 is smaller than the outer diameter of the second column 1112, forming a stepped structure between the first column 1111 and the second column 1112. The first flange 1122 is connected to the circumferential outer side of the first column 1111, and the first column 1111, the second column 1112, and the first flange 1122 together form the first notch 1115.

[0099] The first pressure ring 1121 includes a first body 1121a and a first riveting portion 1121b connected to each other. Both the first body 1121a and the first riveting portion 1121b can contact the first insulating portion 1131 and, under the pressing action of the first flange portion 1122, press the first insulating portion 1131 towards the outer shell 12. The first riveting portion 1121b extends from the first body 1121a toward the second post 1112 and is at least partially embedded in the first notch 1115, so that the first riveting portion 1121b can be limited by the first post 1111, the second post 1112 and the first flange portion 1122. On the one hand, this can reduce the risk of the first pressure ring 1121 loosening, thereby improving the structural reliability of the pole assembly 11. On the other hand, it facilitates the assembly and positioning of the first pressure ring 1121, thereby improving the assembly consistency of the pole assembly 11.

[0100] In some implementations, please refer to Figure 4a The portion of the first riveting part 1121b embedded in the first notch 1115 is an embedded section, and the thickness t2 of the embedded section satisfies 0.4 mm ≤ t2 ≤ 2 mm.

[0101] This helps to improve the compactness of the battery cell 10 and the reliability of the first pressure ring 1121.

[0102] In some embodiments, t2 can be understood as the dimension of the embedded section along the axial direction of the opening 124. t2 satisfies 0.4 mm ≤ t2 ≤ 2 mm. When 0.4 mm ≤ t2, the structural strength of the first riveting part 1121b can be improved, the deformation of the first riveting part 1121b during the clamping process can be reduced, and the reliability of the first pressure ring 1121 can be improved. When t2 ≤ 2 mm, the axial space occupied by the first riveting part 1121b can be reduced, thereby reducing the overall height of the electrode assembly 11 and improving the compactness of the battery cell 10.

[0103] In some examples, t2 = 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, or other values ​​that are greater than or equal to 0.4 mm and less than or equal to 2 mm.

[0104] In some implementations, please refer to Figure 4a The thickness t3 of the first body 1121a satisfies 0.4 mm ≤ t3 ≤ 3 mm.

[0105] This helps to improve the compactness of the battery cell 10 and the reliability of the first pressure ring 1121.

[0106] In some embodiments, the first body 1121a is the main body of the first pressure ring 1121. The first body 1121a is disposed opposite to the first insulating portion 1131 and is used to apply a clamping force to the first insulating portion 1131. t3 can be understood as the dimension of the first body 1121a in the axial direction of the opening 124. The thickness t3 of the first body 1121a satisfies 0.4 mm ≤ t3 ≤ 3 mm. When 0.4 mm ≤ t3, the structural strength of the first body 1121a can be improved, the deformation of the first body 1121a during the clamping process can be reduced, and the reliability of the first pressure ring 1121 can be improved. When t3 ≤ 3 mm, the axial space occupied by the first body 1121a can be reduced, thereby reducing the overall height of the electrode assembly 11 and improving the compactness of the battery cell 10.

[0107] In some examples, t3 = 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, or other values ​​that are greater than or equal to 0.4 mm and less than or equal to 3 mm.

[0108] In one implementation, t3 is greater than or equal to t2.

[0109] In some implementations, please refer to Figure 4a and Figure 5a The first body 1121a and the first riveting part 1121b are connected by a first chamfer structure 1121c or a first rounded corner structure 1121d. The portion of the first flange 1122 facing the first chamfer structure 1121c or the first rounded corner structure 1121d is provided with a second chamfer structure 1122a or a second rounded corner structure 1122b. The first chamfer structure 1121c and the second chamfer structure 1122a are connected in a mating manner, or the first rounded corner structure 1121d and the second rounded corner structure 1122b are connected in a mating manner.

[0110] This improves the assembly reliability between the first pressure ring 1121 and the first flange 1122, while reducing stress concentration to minimize the risk of damage to the first pressure ring 1121 or the first flange 1122.

[0111] In some embodiments, the connection area between the first body 1121a and the first riveting part 1121b is provided with a first chamfer structure 1121c or a first rounded corner structure 1121d. The first chamfer structure 1121c can be an inclined transition surface formed at the connection between the first body 1121a and the first riveting part 1121b, and the first rounded corner structure 1121d can be an arc-shaped transition surface formed at the connection between the first body 1121a and the first riveting part 1121b. By providing the first chamfer structure 1121c or the first rounded corner structure 1121d, a smooth transition can be formed between the first body 1121a and the first riveting part 1121b, reducing stress concentration in the connection area between the first body 1121a and the first riveting part 1121b, thereby improving the structural reliability of the pole assembly 11.

[0112] The portion of the first flange 1122 facing the first chamfer structure 1121c or the first rounded corner structure 1121d is provided with a second chamfer structure 1122a or a second rounded corner structure 1122b. The second chamfer structure 1122a is provided correspondingly to the first chamfer structure 1121c, and the second rounded corner structure 1122b is provided correspondingly to the first rounded corner structure 1121d. This allows the first chamfer structure 1121c to engage with the second chamfer structure 1122a, or the first rounded corner structure 1121d to engage with the second rounded corner structure 1122b, when the first pressure ring 1121 is assembled to the first flange 1122. This reduces stress concentration in the connection area between the first body 1121a and the first riveting portion 1121b, or in the corresponding area of ​​the first flange 1122, thereby improving the structural reliability of the pole assembly 11.

[0113] In some implementations, please refer to Figure 4a and Figure 5a The thickness of the first flange 1122 is t11, the dimension of the first chamfer structure 1121c in the radial direction of the opening 124 is L1, and the maximum thickness of the first chamfer structure 1121c is L2, wherein 0.2 t11≤L1≤0.7 t11, 0.2 t11≤L2≤0.7 t11; The radius of the first rounded corner structure 1121d is r1, where 0.2 t11≤r1≤0.7 t11.

[0114] In this way, the clamping effect of the first flange 1122 on the first pressure ring 1121 can be improved, and the reliability of the first pressure ring 1121 can be improved at the same time.

[0115] In some embodiments, L1 can be understood as the extension dimension of the first chamfer structure 1121c along the radial direction of the opening 124, and the maximum thickness L2 of the first chamfer structure 1121c can be understood as the maximum extension dimension of the first chamfer structure 1121c along the axial direction of the opening 124. L1 and L2 are related to the thickness t11 of the first flange portion 1122, so that the first chamfer structure 1121c can be adapted to different thicknesses of the first flange portion 1122.

[0116] r1 can be understood as the radius of the circle in which the first rounded corner structure 1121d is located. r1 is related to the thickness t11 of the first flange portion 1122, so that the first rounded corner structure 1121d can be adapted to different thicknesses of the first flange portion 1122.

[0117] 0.2 t11≤L1≤0.7 t11, and 0.2 t11≤L2≤0.7 t11, when 0.2 t11≤L1, and 0.2 When t11≤L2, the space occupied by the first chamfer structure 1121c can be reduced, thereby reducing the influence of the first chamfer structure 1121c on the first flange portion 1122, and thus improving the clamping effect of the first flange portion 1122 on the first pressure ring 1121. When L1≤0.7 t11, and L2≤0.7 At t11, stress concentration between the first body 1121a and the first riveting part 1121b can be effectively alleviated, thereby improving the reliability of the first pressure ring 1121.

[0118] 0.2 t11≤r1≤0.7 t11, when 0.2 When t11≤r1, the space occupied by the first rounded corner structure 1121d can be reduced, thereby reducing the influence of the first rounded corner structure 1121d on the first flange portion 1122, and thus improving the clamping effect of the first flange portion 1122 on the first pressure ring 1121. When r1≤0.7 At t11, stress concentration between the first body 1121a and the first riveting part 1121b can be effectively alleviated, thereby improving the reliability of the first pressure ring 1121.

[0119] In some examples, L1 = 0.2 t11, 0.25 t11, 0.3 t11, 0.35 t11, 0.4 t11, 0.45 t11, 0.5 t11, 0.55 t11, 0.6 t11, 0.65 t11, 0.7 t11 or satisfies ≥ 0.2 t11, and less than or equal to 0.7 Other values ​​for t11.

[0120] In some examples, L2 = 0.2 t11, 0.25 t11, 0.3 t11, 0.35 t11, 0.4 t11, 0.45 t11, 0.5 t11, 0.55 t11, 0.6 t11, 0.65 t11, 0.7 t11 or satisfies ≥ 0.2 t11 and less than or equal to 0.7 Other values ​​for t11 mm. The units for L1 and L2 can be millimeters.

[0121] In some examples, r1 = 0.2 t11, 0.25 t11, 0.3 t11, 0.35 t11, 0.4 t11, 0.45 t11, 0.5 t11, 0.55 t11, 0.6 t11, 0.65 t11, 0.7 t11 or satisfies ≥ 0.2 t11, and less than or equal to 0.7 Other values ​​for t11. The unit for r1 can be millimeters.

[0122] In some implementations, please refer to Figure 4a The thickness t11 of the first flange 1122 satisfies 0.5 mm ≤ t11 ≤ 3 mm.

[0123] In this way, the structural strength of the first flange 1122 can be improved, while the risk of cracking of the first flange 1122 can be reduced.

[0124] In some embodiments, t11 can be understood as the dimension of the first flange portion 1122 along the axial direction of the opening 124. The thickness t11 of the first flange portion 1122 satisfies 0.5 mm ≤ t11 ≤ 3 mm. When 0.5 mm ≤ t11, the structural strength of the first flange portion 1122 can be improved, enabling the first flange portion 1122 to effectively press the first pressure ring 1121 to press the first insulating part 1131, and at the same time, the riveting strength between the pole post assembly 11 and the outer shell 12 can be improved. When t11 ≤ 3 mm, the large deformation stress generated in the bending area during the riveting deformation and flange processing of the first flange portion 1122 due to excessive thickness can be reduced, thereby reducing the risk of cracking of the first flange portion 1122.

[0125] In some examples, the thickness t11 of the first flange 1122 is 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, or other values ​​that are greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0126] In some implementations, please refer to Figure 14 and Figure 15 The first pressure ring 1121 is a circular ring of equal thickness or the thickness difference between the thickest and thinnest parts of the first pressure ring 1121 is ±0.03 mm to ±0.2 mm.

[0127] This reduces the machining difficulty of the first pressure ring 1121.

[0128] In some embodiments, the first pressure ring 1121 may be sleeved on the outside of the first column 1111 and connected with the first flange 1122. The first pressure ring 1121 is a circular ring of uniform thickness or the thickness difference between the thickest and thinnest parts of the first pressure ring 1121 is ±0.03 mm to ±0.2 mm, that is, the first pressure ring 1121 has the same thickness at all positions along the circumferential direction, or the thickness difference between all positions along the circumferential direction of the first pressure ring 1121 is within the range of ±0.03 mm to ±0.2 mm, which makes the overall structure of the first pressure ring 1121 simpler, thereby reducing the number of processing steps and reducing the processing difficulty of the first pressure ring 1121.

[0129] In one embodiment, the first column 1111, the first flange 1122, and the second column 1112 form a first notch 1115, and a portion of the ring is embedded in the first notch 1115. The first notch 1115 is used to limit the ring.

[0130] In some implementations, please refer to Figures 16 to 17aThe pressure ring includes a second pressure ring 1124, at least a portion of which is located in the opening 124. A first flange 1122 is connected to the circumferential outer side of the first column 1111 and / or the second column 1112. The first flange 1122 presses the first insulating portion 1131 through the second pressure ring 1124.

[0131] This contributes to the compactness of the battery cell 10.

[0132] In some embodiments, the second pressure ring 1124 passes through the opening 124, which can reduce the space occupied by the second pressure ring 1124 along the axial direction of the opening 124, thereby reducing the overall height of the terminal assembly 11 and improving the compactness of the battery cell 10. The first flange 1122 is connected to the circumferential outer side of the first post 1111 and / or the second post 1112, and applies a clamping force to the first insulating portion 1131 through the second pressure ring 1124, so that the first insulating portion 1131 is in close contact with the outer casing 12 and the terminal 111. Figures 16 to 17a In one embodiment, the first flange 1122 is connected to the outer circumferential direction of the first column 1111 and the second column 1112. In other embodiments, the first flange 1122 may be connected to the outer circumferential direction of the first column 1111. In other embodiments, the first flange 1122 may be connected to the outer circumferential direction of the second column 1112.

[0133] In some implementations, please refer to Figure 17 The second pressure ring 1124 includes a second body 1124a, a second riveting part 1124b and a third riveting part 1124c. The second body 1124a has an opening 124. The second riveting part 1124b and the third riveting part 1124c are respectively connected to the two ends of the second body 1124a. The second riveting part 1124b is located on the outer circumferential side of the second body 1124a, and the third riveting part 1124c is located on the inner circumferential side of the second body 1124a. The first flange portion 1122 is pressed onto the third riveting portion 1124c, so that the third riveting portion 1124c drives the second riveting portion 1124b to press the first insulating portion 1131 through the second body 1124a.

[0134] This improves the compressive stability of the first insulating part 1131 and the riveting strength between the pole assembly 11 and the housing 12.

[0135] In some embodiments, the second body 1124a has an annular structure. The outer circumferential side of the second body 1124a can be understood as the side away from the central axis of the second body 1124a, and the inner circumferential side of the second body 1124a can be understood as the side close to the central axis of the second body 1124a. The second riveting portion 1124b is located on the outer circumferential side of the second body 1124a, that is, the second riveting portion 1124b extends from the second body 1124a in a direction away from the central axis of the second body 1124a; the third riveting portion 1124c is located on the inner circumferential side of the second body 1124a, that is, the third riveting portion 1124c extends from the second body 1124a in a direction close to the central axis of the second body 1124a.

[0136] The first flange portion 1122 is riveted to the third riveting portion 1124c. The clamping force of the first flange portion 1122 can be transmitted to the second body 1124a through the third riveting portion 1124c and to the second riveting portion 1124b, so that the second riveting portion 1124b presses the first insulating portion 1131 in the direction close to the outer shell 12.

[0137] In some implementations, please refer to Figure 17a The thickness t12 of the first flange 1122 satisfies 0.4 mm ≤ t12 ≤ 3 mm.

[0138] In this way, the structural strength of the first flange 1122 can be improved, while the risk of cracking of the first flange 1122 can be reduced.

[0139] In some embodiments, t12 can be understood as the dimension of the first flange portion 1122 along the axial direction of the opening 124. The thickness t12 of the first flange portion 1122 satisfies 0.4 mm ≤ t12 ≤ 3 mm. When 0.4 mm ≤ t12, the structural strength of the first flange portion 1122 can be improved, enabling the first flange portion 1122 to effectively press the second pressure ring 1124 to press the first insulating part 1131, and at the same time, the riveting strength between the pole post assembly 11 and the outer shell 12 can be improved. When t12 ≤ 3 mm, the large deformation stress generated in the bending area during the riveting deformation and flange processing of the first flange portion 1122 due to excessive thickness can be reduced, thereby reducing the risk of cracking of the first flange portion 1122.

[0140] In some examples, the thickness t12 of the first flange 1122 is 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, or other values ​​that are greater than or equal to 0.4 mm and less than or equal to 3 mm.

[0141] In some implementations, please refer to Figures 18 to 24 The pressing part 112 is a second flange 1123 integrally connected to the outer circumferential side of at least one of the first column 1111 and the second column 1112.

[0142] This simplifies the structure of the pole assembly 11.

[0143] In some embodiments, the clamping part 112 is a second flange 1123 integrally connected to the circumferential outer side of at least one of the first column 1111 and the second column 1112. During the processing of the pole post 111, the second flange 1123 can be formed by flanged one end of the pole post 111, so that no additional connection structure is needed between the second flange 1123 and at least one of the first column 1111 and the second column 1112, thereby improving the connection strength between the clamping part 112 and the pole post 111 and reducing the processing difficulty of the pole post assembly 11. The second flange 1123 extends outward from the circumferential outer side of at least one of the first column 1111 and the second column 1112, and the second flange 1123 can clamp the first insulating part 1131 in the direction close to the outer shell 12, so that the first insulating part 1131 is in close contact with the outer shell 12 and the pole post 111.

[0144] In some implementations, please refer to Figure 3 and Figure 4 The pole post 111 also includes a limiting part 1113, which is connected to the circumferential outer side of the end of the second post 1112 away from the first post 1111.

[0145] The insulating component 113 also includes a second insulating portion 1132, which separates the outer shell 12 from the electrode assembly 13. The limiting portion 1113 presses the second insulating portion 1132 against the inner wall of the outer shell 12. And / or the pole assembly 11 also includes a seal 114, with a limiting portion 1113 pressing the seal 114 against the inner wall of the housing 12.

[0146] This can improve the sealing reliability between the housing 12 and the pole 111, and / or the insulation reliability between the electrode assembly 13 and the housing 12.

[0147] In some embodiments, the second insulating portion 1132 is disposed between the housing 12 and the electrode assembly 13 to separate the electrode assembly 13 from the housing 12, preventing short circuits caused by contact between the electrode assembly 13 and the housing 12. A limiting portion 1113 is connected to the circumferential outer side of the end of the second column 1112 away from the first column 1111. The limiting portion 1113 is located within the receiving cavity 123 and abuts against the second insulating portion 1132. The limiting portion 1113 limits the second insulating portion 1132, pressing it tightly against the inner wall of the housing 12, ensuring close contact between the second insulating portion 1132 and the inner wall of the housing 12, thereby improving the insulation reliability between the electrode assembly 13 and the housing 12.

[0148] In some embodiments, the seal 114 is disposed between the housing 12 and the pole post 111 to fill the gap between them, thereby improving the sealing performance between the housing 12 and the pole post 111. The limiting portion 1113 is connected to the circumferential outer side of the end of the second pole post 1112 away from the first pole post 1111. The limiting portion 1113 is located within the receiving cavity 123 and abuts against the seal 114. The limiting portion 1113 can limit the seal 114, pressing it tightly against the inner wall of the housing 12, ensuring close contact between the seal 114 and the inner wall of the housing 12, and improving the sealing effect between the housing 12 and the pole post 111.

[0149] In some embodiments, the electrode assembly 11 includes a seal 114, and the insulator 113 includes a second insulating portion 1132. When the electrode assembly 11 is assembled onto the housing 12, the limiting portion 1113 can apply a pressing force to the seal 114 and the second insulating portion 1132, so that the seal 114 and the inner wall of the housing 12, and the second insulating portion 1132, are in close contact with the inner wall of the housing 12, thereby improving the sealing effect between the housing 12 and the electrode 111, and at the same time improving the insulation reliability between the electrode assembly 13 and the housing 12.

[0150] In one embodiment, the seal 114 is a circular ring structure, which can reduce the assembly difficulty of the seal 114, reduce the possibility of the seal 114 being installed backwards, and improve the assembly reliability of the pole assembly 11. The seal 114 includes, but is not limited to, a rubber ring.

[0151] In one embodiment, the first insulating portion 1131 and the second insulating portion 1132 are connected by a seal 114. The second insulating portion 1132 and the seal 114 can be integrally formed or separately disposed. When the second insulating portion 1132 and the seal 114 are integrally formed, the number of parts can be reduced, the assembly process of the pole assembly 11 can be simplified, and the connection reliability between the second insulating portion 1132 and the seal 114 can be improved. When the second insulating portion 1132 and the seal 114 are separately disposed, the corresponding materials can be selected according to the required performance of the first insulating portion 1131, the second insulating portion 1132, and the seal 114, thereby improving the insulation and sealing performance of the pole assembly 11.

[0152] In one embodiment, the first insulating portion 1131 and the second insulating portion 1132 are integrally formed. This reduces the assembly gap between the first insulating portion 1131 and the second insulating portion 1132, lowers the risk of insulation failure due to assembly errors, and simultaneously improves the connection strength between the first insulating portion 1131 and the second insulating portion 1132. The first insulating portion 1131 and the second insulating portion 1132 can be formed into an integral structure through injection molding, hot pressing, or other molding processes.

[0153] In one embodiment, the first insulating portion 1131 and the second insulating portion 1132 may be made of the same or different materials. The first insulating portion 1131 and the second insulating portion 1132 may be made of the same insulating material to facilitate processing and manufacturing; or, the first insulating portion 1131 and the second insulating portion 1132 may be made of different insulating materials according to the stress conditions and insulation requirements of their respective locations to meet the performance requirements of different parts of the pole assembly 11.

[0154] In one embodiment, the material of the seal 114 is different from the material of the first insulating portion 1131 or the second insulating portion 1132. This allows the seal 114 to be selected from materials with better sealing performance according to its sealing requirements, while the first insulating portion 1131 or the second insulating portion 1132 can be selected from materials appropriate to its insulation and structural support requirements, thereby improving the insulation and sealing reliability of the pole assembly 11. In some embodiments, please refer to... Figure 4 The seal 114 is connected to the outer circumferential side of the second column 1112.

[0155] This improves the sealing reliability of the pole assembly 11.

[0156] In some embodiments, the seal 114 is fitted around the circumferential outer side of the second post 1112 and abuts against the outer circumferential surface of the second post 1112. The second post 1112 has an opening 124, and the seal 114 can seal the gap between the second post 1112 and the housing 12. When the electrode assembly 11 is installed on the housing 12, the seal 114 is pressed by the limiting part 1113 and undergoes elastic deformation, thereby improving the sealing performance between the seal 114 and the second post 1112 and the housing 12, and reducing the risk of leakage of conductive media such as electrolyte through the gap between the second post 1112 and the housing 12.

[0157] In some implementations, please refer to Figures 3 to 4a The outer radial dimension of the axial projection of the seal 114 is d6, the diameter of the opening 124 is d3, and the outer diameter of the second column 1112 is d2, wherein d2+0.8 mm≤d3≤d6-2 mm.

[0158] This improves the ease of assembly of the pole assembly 11 and enhances the sealing reliability of the seal 114.

[0159] It should be noted that the axial projection of the seal 114 is the projection of the seal 114 in the axial direction of the opening 124. The outer radial dimension of the axial projection is the dimension between the two outer sides of the seal 114 measured in the radial direction of the opening 124 (as shown in the X direction). This dimension is obtained when the battery cell 100 is cut by any section parallel to the axial direction of the opening 124 (as shown in the Z direction) and passing through the central axis P of the pole post 111.

[0160] In some embodiments, when d2+0.8 mm≤d3, the diameter of the opening 124 is larger than the outer diameter of the second column 1112, which facilitates the second column 1112 to pass through the opening 124, reduces the risk of interference between the second column 1112 and the outer shell 12, and improves the assembly convenience of the pole assembly 11.

[0161] When d3≤d6-2 mm, the diameter of the opening 124 is smaller than the outer radial dimension of the axial projection of the seal 114, so that the seal 114 can effectively seal the gap between the second column 1112 and the outer shell 12, thereby improving the sealing effect between the second column 1112 and the outer shell 12.

[0162] In some examples, the diameter of the opening 124, d3, is equal to d2+0.8 mm, d2+0.85 mm, d2+0.9 mm, d2+0.95 mm, d2+1 mm, d6-2.2 mm, d6-2.15 mm, d6-2.1 mm, d6-2.05 mm, d6-2 mm, or other values ​​that are greater than or equal to d2+0.8 mm and less than or equal to d6-2 mm.

[0163] In one embodiment, the seal 114 is cylindrical, and the outer radial dimension of the axial projection of the seal 114 is the outer diameter of the seal 114.

[0164] In some implementations, please refer to Figure 3 and Figure 4 The limiting part 1113 includes a third column 1113a and a fourth column 1113b. The second column 1112, the third column 1113a and the fourth column 1113b are coaxially arranged. The third column 1113a is connected between the second column 1112 and the fourth column 1113b. The third column 1113a protrudes from the fourth column 1113b in the height direction. The third column 1113a presses a part of the seal 114 against the inner wall of the housing 12. The fourth column 1113b presses a part of the second insulating part 1132 against the inner wall of the housing 12.

[0165] This improves the stability and assembly consistency of the seal 114 and the second insulation part 1132.

[0166] In some embodiments, the fourth column 1113b is connected to the end of the second column 1112 away from the first column 1111 via the third column 1113a, and the second column 1112, the third column 1113a, and the fourth column 1113b are coaxially arranged. The third column 1113a is located between the second column 1112 and the fourth column 1113b, and the third column 1113a protrudes beyond the fourth column 1113b in the height direction, creating a height difference between the third column 1113a and the fourth column 1113b. The third column 1113a abuts against the seal 114 to press the seal 114; the fourth column 1113b abuts against the second insulating portion 1132 to press the second insulating portion 1132. The height direction is the Z direction as shown in the figure.

[0167] When the pole assembly 11 is installed on the housing 12, the third pole 1113a can apply a pressing force to at least a portion of the seal 114, pressing at least a portion of the seal 114 against the inner wall of the housing 12, thereby improving the fit between the seal 114 and the housing 12; the fourth pole 1113b can apply a pressing force to at least a portion of the second insulating portion 1132, pressing at least a portion of the second insulating portion 1132 against the inner wall of the housing 12, thereby improving the fit between the second insulating portion 1132 and the housing 12.

[0168] The second column 1112 has an opening 124, so a stepped structure can be formed between the second column 1112 and the third column 1113a to facilitate the positioning of the seal 114; the height of the third column 1113a is greater than that of the fourth column 1113b, so a stepped structure can be formed between the third column 1113a and the fourth column 1113b to facilitate the positioning of the second insulating part 1132, thereby improving the assembly consistency of the seal 114 and the second insulating part 1132.

[0169] In some implementations, please refer to Figure 4 The seal 114 covers the radial gap between the second insulating portion 1132 and the third column 1113a.

[0170] This can improve the sealing reliability of the pole assembly 11.

[0171] In some embodiments, a portion of the second insulating portion 1132 is connected to the circumferential outer side of the third post 1113a. The second insulating portion can be positioned by the third post 1113a during assembly, improving the assembly consistency of the second insulating portion 1132. A seal 114 is fitted over the outer side of the second post 1112, and the seal 114 can cover the radial gap between the second insulating portion 1132 and the third post 1113a, thereby improving the sealing reliability of the pole assembly 11.

[0172] In some implementations, please refer to Figures 3 to 4a The outer radial dimension of the axial projection of the seal 114 is d6, the diameter of the opening 124 is d3, and the outer diameter of the third column 1113a is d4, wherein d3+2 mm≤d4≤d6.

[0173] This can improve the sealing reliability of the pole assembly 11.

[0174] In some embodiments, when d3+2 mm≤d4, the outer diameter of the third column 1113a is at least 2 mm larger than the diameter of the opening 124, which facilitates the third column 1113a to apply a pressing force to the seal 114, thereby improving the fit reliability between the seal 114 and the inner wall of the housing 12, and thus improving the sealing reliability of the pole assembly 11.

[0175] When d4≤d6, the outer radial dimension of the axial projection of the seal 114 is greater than or equal to the outer diameter of the third column 1113a, so that the seal 114 can effectively cover the gap between the third column 1113a and the outer shell 12 in the radial direction of the opening 124, thereby reducing the risk of leakage of conductive media such as electrolyte and improving the sealing reliability of the pole assembly 11.

[0176] In some examples, the outer diameter d4 of the third column 1113a is d3+2 mm, d3+2.05 mm, d3+2.1 mm, d3+2.15 mm, d3+2.2 mm, d6-0.2 mm, d6-0.15 mm, d6-0.1 mm, d6-0.05 mm, d6, or other values ​​that are greater than or equal to d3+2 mm and less than or equal to d6.

[0177] In some implementations, please refer to Figure 3 and Figure 4 In the radial direction of the opening 124, the seal 114 is spaced apart from the second insulating portion 1132 to form a clearance space 1231.

[0178] This improves the reliability of the seal 114.

[0179] In some embodiments, in the axial direction of the opening 124, a clearance space 1231 is provided on the side of the second insulating portion 1132 away from the fourth column 1113b. When the seal 114 is compressed, the clearance space 1231 can provide flow space for the deformation of the seal 114, reduce the risk of the seal 114 cracking due to excessive local compression, and improve the reliability of the seal 114.

[0180] In some implementations, please refer to Figure 3 and Figure 4 A first limiting structure 1131a is provided on the surface of the first insulating part 1131 facing the pressing part 112, and a second limiting structure 1125 is provided on the surface of the pressing part 112 facing the first insulating part 1131. The first limiting structure 1131a and the second limiting structure 1125 are connected to limit the relative position between the first insulating part 1131 and the pressing part 112.

[0181] This reduces the risk of the first insulating part 1131 shifting during assembly or use, and improves the stability of the first insulating part 1131.

[0182] In some embodiments, during the assembly of the pole assembly 11, the clamping part 112 presses the first insulating part 1131 in a direction close to the housing 12. The first limiting structure 1131a and the second limiting structure 1125 are connected to each other, which can limit the relative movement between the first insulating part 1131 and the clamping part 112, improve the positional stability between the first insulating part 1131 and the clamping part 112, and reduce the displacement of the first insulating part 1131 during assembly or use.

[0183] In one embodiment, the pressing part 12 includes a first pressing ring 1121 and a first flange 1122. The first flange 1122 is integrally connected to the circumferential outer side of at least one of the first column 1111 and the second column 1112. The second limiting structure 1125 is provided on the surface of the first pressing ring 1121 facing the first insulating part 1131.

[0184] In one embodiment, the clamping part 112 includes a second clamping ring 1124 and a first flange 1122. The first flange 1122 is integrally connected to the circumferential outer side of at least one of the first column 1111 and the second column 1112. The second limiting structure 1125 is provided on the surface of the second clamping ring 1124 facing the first insulating portion 1131.

[0185] In one embodiment, the pressing part 112 is a second flange 1123, which is integrally connected to the circumferential outer side of at least one of the first column 1111 and the second column 1112, and the second limiting structure 1125 is provided on the surface of the second flange 1123 facing the first insulating part 1131.

[0186] In some implementations, please refer to Figure 4 The first limiting structure 1131a includes one of a protrusion and a groove, and the second limiting structure 1125 includes the other of a protrusion and a groove, with at least a portion of the protrusion embedded in the groove.

[0187] In this way, the first insulating part 1131 and the pressing part 112 can be limited.

[0188] In some embodiments, the protrusions and grooves are correspondingly arranged. When the first insulating portion 1131 and the clamping portion 112 are assembled, at least a portion of the protrusion is embedded in the groove, forming a concave-convex fit between the first insulating portion 1131 and the clamping portion 112. Since the protrusion is embedded in the groove, a limiting effect can be formed between the protrusion and the groove, restricting relative movement between the first insulating portion 1131 and the clamping portion 112.

[0189] In one embodiment, the shape, number, and size of the protrusions and grooves are adapted to each other and can be determined according to actual needs. This embodiment does not impose specific limitations on this.

[0190] In one embodiment, a groove is provided on the pressing part 112, and a protrusion is provided on the first insulating part 1131. In another embodiment, the groove is provided at a position where the thickness of the pressing part 112 is relatively large, which not only limits the distance between the first insulating part 1131 and the pressing part 112, but also improves the structural strength of the pressing part 112 and reduces the risk of local strength reduction in the pressing part 112 due to the groove.

[0191] In some implementations, please refer to Figure 4 The protrusions include annular protrusions and / or multiple protrusion segments spaced apart along the circumferential direction of the pole post 111, and the grooves include annular grooves and / or multiple groove segments adapted to the multiple protrusion segments.

[0192] This improves the limiting effect between the first insulating part 1131 and the pressing part 112.

[0193] In some embodiments, the annular protrusion can be understood as a protrusion that extends continuously along the circumferential direction of the pole post 111 and is connected end to end, and the annular groove can be understood as a depression that extends continuously along the circumferential direction of the pole post 111 and is connected end to end. The annular protrusion and the annular groove are adapted to each other.

[0194] The multiple protruding segments can be understood as multiple protrusions spaced apart along the circumferential direction of the pole post 111, with adjacent protruding segments spaced apart. The multiple recessed segments can be understood as multiple recesses spaced apart along the circumferential direction of the pole post 111, with adjacent recessed segments spaced apart. The protruding segments are respectively connected to their corresponding recessed segments.

[0195] In one embodiment, the first limiting structure 1131a includes a protrusion, and the second limiting structure 1125 includes a groove. The protrusion includes an annular protrusion, and the groove includes an annular groove. The annular protrusion and the annular groove cooperate to form a single-layer annular limiting structure.

[0196] In one embodiment, the first limiting structure 1131a includes a protrusion, and the second limiting structure 1125 includes a groove. The protrusion includes multiple protruding segments, and the groove includes multiple groove segments. The multiple protruding segments and the multiple groove segments cooperate to form a single-layer segmented limiting structure.

[0197] In one embodiment, the first limiting structure 1131a includes a plurality of protrusions, and the second limiting structure 1125 includes a plurality of grooves. The protrusions include annular protrusions, and the grooves include annular grooves. The plurality of annular protrusions and the plurality of annular grooves cooperate to form a multi-layered annular limiting structure.

[0198] In one embodiment, the first limiting structure 1131a includes a plurality of protrusions, and the second limiting structure 1125 includes a plurality of grooves. The protrusions include a plurality of protruding segments, and the grooves include a plurality of groove segments. The plurality of protruding segments and the plurality of groove segments cooperate to form a multi-layer segmented limiting structure.

[0199] In some implementations, please refer to Figure 4 The wall thickness of the protrusion is less than the width of the groove.

[0200] This makes it easier to fit the protrusion into the groove.

[0201] In some embodiments, the wall thickness of the protrusion can be understood as the difference between the outer diameter and the inner diameter of the protrusion, and the width of the groove can be understood as the dimension of the groove along the radial direction of the opening 124. When the wall thickness of the protrusion is less than the width of the groove, a clearance fit can be formed between the protrusion and the groove. During the assembly process of the first insulating part 1131 and the pressing part 112, the protrusion can be smoothly embedded in the groove, improving the assembly convenience of the first insulating part 1131 and the pressing part 112. At the same time, after the protrusion is embedded in the groove, the groove can limit the protrusion and restrict the movement of the first insulating part 1131 relative to the pressing part 112.

[0202] In some implementations, please refer to Figure 4 The height of the protrusion is greater than the depth of the groove.

[0203] This improves the limiting effect between the first insulating part 1131 and the pressing part 112.

[0204] In some embodiments, the height of the protrusion can be understood as the dimension of the protrusion along the axial direction of the opening 124, and the depth of the groove can be understood as the dimension of the groove along the axial direction of the opening 124. When the height of the protrusion is greater than the depth of the groove, when the first insulating part 1131 is pressed by the pressing part 112, the protrusion is compressed by the bottom surface of the groove and undergoes a certain deformation, so that the protrusion fully fills the groove, improving the fit between the protrusion and the groove, thereby improving the limiting effect between the first insulating part 1131 and the pressing part 112.

[0205] In some implementations, please refer to Figure 4 The volume of the protrusion is 0.8 to 1.5 times the volume of the groove.

[0206] This improves the reliability of the fit between the protrusion and the groove.

[0207] In some embodiments, the volume of a protrusion can be understood as the volume of space occupied by the protrusion, and the volume of a groove can be understood as the volume of space that the groove can accommodate the solid structure. A volume of 0.8 to 1.5 times the volume of a groove means that the volume of a single protrusion or a single protrusion segment is 0.8 to 1.5 times the volume of the corresponding single groove or a single groove segment. When the volume of the protrusion is greater than or equal to 0.8 times the volume of the groove, the gap between the protrusion and the groove can be reduced, thereby improving the positioning accuracy between the first insulating part 1131 and the pressing part 112. When the volume of the protrusion is less than or equal to 1.5 times the volume of the groove, the excessive deformation of the protrusion after compression can be reduced, lowering the risk of the protrusion being crushed due to excessive compression, and the protrusion is also relatively easy to assemble into the groove.

[0208] The volume V1 of the protrusion is 0.8 to 1.5 times the volume V2 of the groove, i.e., 0.8 ≤ V1 / V2 ≤ 1.5. In some examples, V1 / V2 = 0.8, 0.87, 0.94, 1.01, 1.08, 1.15, 1.22, 1.29, 1.36, 1.42, 1.49, 1.5 or other values ​​greater than or equal to 0.8 and less than or equal to 1.5.

[0209] In some implementations, please refer to Figures 3 to 24 The terminal post 111 includes a welding part 1114, the battery cell 10 also includes a current collector 14, the electrode assembly 13 includes a tab, the current collector 14 is connected between the welding part 1114 and the tab, and the welding part 1114 is located outside or inside the receiving cavity 123.

[0210] This improves the compatibility of the connection between the pole assembly 11 and the electrode assembly 13.

[0211] In some embodiments, the welding portion 1114 is used to connect to the current collector 14 to form an electrical connection between the terminal post 111 and the electrode assembly 13. The tab is connected to the current collector 14, and the current collector 14 is connected to the welding portion 1114, allowing the current generated by the electrode assembly 13 to be transmitted to the terminal post 111 via the tab, current collector 14, and welding portion 1114, and then led out from the terminal post 111 to the outside of the battery cell 10. By placing the welding portion 1114 outside or inside the receiving cavity 123, the welding position can be selected according to the internal spatial layout of the battery cell 10 or other requirements, improving the adaptability of the connection between the terminal post assembly 11 and the electrode assembly 13.

[0212] In some implementations, please refer to Figures 18 to 20 The welding part 1114 is located outside the receiving cavity 123. The pole post 111 also includes a first column 1111 and a second column 1112 coaxially arranged. The second column 1112 has an opening 124. The first column 1111 connects the second column 1112 and the clamping part 112. The pole post 111 has a mounting hole 1116 that passes through the first column 1111 and the second column 1112. The welding part 1114 is connected to the mounting hole 1116 corresponding to the hole wall of the first column 1111. The connecting part 141 of the collector plate 14 extends into the mounting hole 1116 and is connected to the welding part 1114.

[0213] This facilitates the welding of the manifold 14 and the welding part 1114.

[0214] In some embodiments, the first column 1111 and the second column 1112 are coaxially arranged, with the second column 1112 having a through hole 124, and the first column 1111 connecting the second column 1112 and the clamping part 112. The pole post 111 has a mounting hole 1116 penetrating the first column 1111 and the second column 1112, and a welding part 1114 is provided on the hole wall of the mounting hole 1116 corresponding to the first column 1111, so that the welding part 1114 is located outside the receiving cavity 123. Because the welding part 1114 is located outside the receiving cavity 123, the welding area between the pole post 111 and the collector plate 14 can be moved upwards, eliminating the need for the sealing pin 115.

[0215] The connecting portion 141 of the collector plate 14 can extend into the mounting hole 1116 and connect with the welding portion 1114. The portion of the collector plate 14 that does not extend into the mounting hole 1116 is located in the receiving cavity 123 and connected with the electrode tab, thereby realizing the electrical connection between the electrode assembly 13 and the electrode post 111.

[0216] It is understood that the welding part 1114 is located outside the receiving cavity 123, which facilitates welding of the welding part 1114 and the current collector 14 from outside the outer shell 12, thereby providing a larger welding operation space and improving welding efficiency. At the same time, at least a portion of the clamping part 112 and at least one of the first column 1111 can be used to connect with the battery plate, so that the electrode assembly 11 can simultaneously meet the connection requirements of the electrode assembly 13 and the battery plate, which can improve the integration of the battery cell 10.

[0217] In some embodiments, the connecting portion 141 forms a first cavity 142, the first cavity 142 satisfying at least one of the following conditions: A) The dimension h2 in the axial direction of the opening 124 satisfies 0 < h2 ≤ 5 mm; B) The radial dimension d7 of the opening 124 satisfies 1mm≤d7≤20mm; C) The ratio of the dimension h2 in the axial direction of the opening 124 to the dimension h3 in the axial direction of the pole post 111 in the opening 124 is T = h2 / h3, 0 < T ≤ 0.95.

[0218] Therefore, the first cavity 142 can isolate the heat generated during the welding of the thinned part and the connecting part 141 from the effect of the diaphragm of the electrode assembly 13, and prevent the diaphragm from being burned.

[0219] In one embodiment, the first cavity 142 satisfies conditions A, B, and C. In one embodiment, the first cavity 142 satisfies conditions A, B, or C. In one embodiment, the first cavity 142 satisfies any two of conditions A, B, and C.

[0220] When 0 < h2, the welding position between the thinned portion and the connecting portion 141 can be moved away from the electrode assembly 13. When h2 ≤ 5 mm, the excessive depth of the first cavity 142 can be avoided, which would affect the structural dimensions of the welding portion 1114. In some examples, h2 = 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or other values ​​that satisfy 0 < h2 ≤ 5 mm.

[0221] When 1mm ≤ d7, the connecting part 141 and the thinned part have a larger contact area, which facilitates welding and improves the welding strength between the connecting part 141 and the thinned part. When d7 ≤ 20mm, the width of the first cavity 142 is prevented from being too large, thus affecting the structural dimensions of the first column 1111 and the second column 1112. In some examples, d7 = 1mm, 1.2mm, 2mm, 3mm, 5mm, 8mm, 10mm, 11mm, 13mm, 15mm, 17mm, 18mm, 19mm, 20mm, or other values ​​that satisfy 1mm ≤ d7 ≤ 20mm.

[0222] T = h² / h³, 0 < T ≤ 0.95. When 0 < T, a first cavity 142 can be formed, keeping the welding position of the thinned portion and the connecting portion 141 away from the electrode assembly 13. When T ≤ 0.95, it avoids the first cavity 142 being too deep, which could affect the dimensions of other structures of the electrode post 111, and also avoids the first cavity 142 being too shallow, thus effectively keeping the welding position of the thinned portion and the connecting portion 141 away from the electrode assembly 13. In some examples, T = 0.2, 0.4, 0.6, 0.8, 0.9, 0.95, or other values ​​satisfying 0 < T ≤ 0.95.

[0223] In some implementations, please refer to Figures 18 to 20 The welding part 1114 has at least one first groove 1114a on the surface away from the collector plate 14.

[0224] In this way, electrical connection between pole 111 and tab can be achieved while avoiding interference with the welding of the tab.

[0225] In some embodiments, the welding portion 1114 has at least one first groove 1114a on its surface opposite to the collector plate 14. The portion of the welding portion 1114 corresponding to the first groove 1114a is a thinned portion, which can be connected to the connecting portion 141 of the collector plate 14. Specifically, during welding, the thinned portion and the connecting portion 141 of the collector plate 14 can be connected at the first groove 1114a by welding (such as through welding), thereby realizing the connection between the electrode tab and the electrode post 111 through the collector plate 14.

[0226] It should be noted that the surface of the welded part 1114 facing away from the collector plate 14 is at least a part of the outer end face of the pole post 111. The connection part 141 between the welded part 1114 and the collector plate 14 is welded at the thinned position, that is, the thinned part is connected to the connection part 141, rather than at any position of the welded part.

[0227] Since the welding part 1114 has at least one first groove 1114a on the surface away from the collector plate 14, the first groove 1114a can accommodate the welding residue between the thinned part and the connecting part 141, thus avoiding interference with the welding of the sheet metal.

[0228] Apart from the first groove 1114a, other areas of the outer end face of the pole post 111 can be used as the welding area 1114b for welding with the welding plate. The welding plate can be welded to other areas of the outer end face of the pole post 111 except for the surface of the welding part 1114 that is away from the collector plate 14, or to the part of the welding part 1114 except for the thinned part, or to the part of the welding part 1114 except for the thinned part, and to other areas of the outer end face of the pole post 111 except for the surface of the welding part 1114 that is away from the collector plate 14. This application does not limit this.

[0229] This embodiment does not limit the number, shape, or distribution of the first grooves 1114a; the specific arrangement can be determined according to requirements and other factors. The first grooves 1114a can be formed by processes including but not limited to plastic molding and cutting removal.

[0230] In some implementations, please refer to Figure 18 and Figure 20 The portion of the welded part 1114 corresponding to the first groove 1114a is a thinned part, and the thickness t4 of the thinned part satisfies 0.5 mm ≤ t4 ≤ 2 mm.

[0231] In this way, the connection strength between the thinned part and the connecting part 141 can be improved, while the thermal impact on the surrounding structure during welding can be reduced.

[0232] In some embodiments, the thickness t4 of the thinned portion satisfies 0.5 mm ≤ t4 ≤ 2 mm. The 0.5 mm ≤ t4 can, to some extent, prevent the thinned portion from being too thin and resulting in insufficient connection strength, while the t4 ≤ 2 mm can, to some extent, prevent the thinned portion from being too thick and resulting in a large laser energy required for penetration welding, which would have a large thermal impact on the surrounding structure (including but not limited to the insulating component 113, the sealing component 114, etc.) during welding.

[0233] In some examples, t4 = 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, or other values ​​where 0.5 mm ≤ t4 ≤ 2 mm.

[0234] In some implementations, please refer to Figures 25 to 31 The shape of at least one first groove 1114a includes at least one of the following: circular, annular, fan-shaped, and strip-shaped. The annular first grooves 1114a are arranged concentrically, the fan-shaped first grooves 1114a are arranged in annular intervals, and the strip-shaped first grooves 1114a are arranged radially.

[0235] Thus, the shape of the first groove 1114a is simple, which can reduce manufacturing costs.

[0236] In some implementations, in one implementation, please refer to Figure 25 There is one first groove 1114a, and the shape of the first groove 1114a is circular. The center of the circle can be located on the central axis P of the pole post 111.

[0237] In one implementation, please refer to Figure 26 The number of first grooves 1114a is one, and the shape of the first groove 1114a is annular, specifically a circular ring. The center of the annular ring can be located on the central axis P of the pole post 111. In other ways, the number of first grooves 1114a is multiple (two or more), and the multiple annular first grooves 1114a are arranged concentrically. The annular ring can also be a square annular ring.

[0238] In one implementation, please refer to Figure 27 There are four first grooves 1114a, each fan-shaped with an angle of 90 degrees. The four first grooves 1114a are arranged in a non-continuous ring, with the center of the ring located on the central axis P of the pole post 111. In other embodiments, the angles of the fan-shaped first grooves 1114a can be all unequal, or partially equal and partially unequal.

[0239] In one implementation, please refer to Figure 28 There are three first grooves 1114a. The shape of the first grooves 1114a is fan-shaped. The angle of the three fan-shaped sections is 90 degrees. The three first grooves 1114a are arranged in a ring-shaped interval to form a discontinuous fan shape. The center of the ring containing the discontinuous fan shape can be located on the central axis P of the pole post 111.

[0240] In one implementation, please refer to Figure 29 There is one first groove 1114a. The first groove 1114a is fan-shaped with an angle of 270 degrees. The center of the annulus containing the fan can be located on the central axis P of the pole post 111.

[0241] In one implementation, please refer to Figure 30There are six first grooves 1114a. Each first groove 1114a is strip-shaped, specifically a rectangle of equal length and width. These first grooves 1114a are arranged radially, and the elongated lines of all the first grooves 1114a in the longitudinal direction intersect at the central axis P of the pole post 111. Please refer to... Figure 31 There are five first grooves 1114a. The first grooves 1114a are strip-shaped, specifically rectangular with equal length and width. The multiple first grooves 1114a are arranged radially, and the extension lines of all the first grooves 1114a in the longitudinal direction intersect at the central axis P of the pole post 111. In other embodiments, the dimensions (length, width, and depth) of the multiple strip-shaped first grooves 1114a can be all equal, or partially equal and partially unequal.

[0242] It is understood that the shape and number of the first groove 1114a are not limited to the embodiments listed in the above description, as long as welding can be performed at the first groove 1114a.

[0243] In some implementations, please refer to Figure 3 , Figure 6 , Figure 8 , Figure 10 , Figure 14 , Figure 16 , Figure 21 , Figure 23 The welding part 1114 is located in the receiving cavity 123. The pole post 111 also includes a first column 1111 and a second column 1112 arranged coaxially. The second column 1112 is provided with an opening 124. The first column 1111 connects the second column 1112 and the clamping part 112. The pole post 111 is provided with a mounting hole 1116 that passes through the first column 1111 and the second column 1112. The welding part 1114 is connected to the wall of the mounting hole 1116 corresponding to the hole wall of the second column 1112. The pole assembly 11 also includes a sealing pin 115, which connects at least a portion of the clamping part 112 and at least one of the first pillars 1111.

[0244] Thus, the sealing of the welded part 1114 can be achieved through the cooperation of the sealing pin 115 with the pressing part 112 and / or the first column 1111.

[0245] In some embodiments, the sealing pin 115 connects to at least a portion of the clamping part 112. Through the cooperation between the sealing pin 115 and the clamping part 112, the mounting hole 1116 can be closed, thereby achieving a seal on the welded part 1114.

[0246] In some implementation methods, please refer to Figure 6 , Figure 14 , Figure 21 The sealing pin 115 connects to the first column 1111. Through the cooperation between the sealing pin 115 and the first column 1111, the mounting hole 1116 can be closed, thereby achieving the sealing of the welded part 1114.

[0247] In some implementation methods, please refer to Figure 3 , Figure 8 , Figure 10 , Figure 16 , Figure 23 The sealing pin 115 connects at least a portion of the clamping part 112 and the first column 1111. Through the cooperation of the sealing pin 115 with the clamping part 112 and the first column 1111, the mounting hole 1116 can be closed, thereby achieving a seal on the welded part 1114. The sealing pin 115 can be used to connect with the plate.

[0248] In some implementations, please refer to Figure 3 , Figure 8 , Figure 10 , Figure 16 , Figure 23 The sealing nail 115 covers at least a portion of the clamping part 112 and the first column 1111.

[0249] Thus, the sealing of the welded part 1114 can be achieved through the cooperation of the sealing nail 115 with the pressing part 112 and the first column 1111.

[0250] In some implementations, in Figure 3 In one embodiment, the sealing pin 115 covers a portion of the clamping part 112 and the first column 1111. The sealing pin 115 is welded to the edge of the clamping part 112 toward the perforation, thereby closing the mounting hole 1116 to seal the welded part 1114.

[0251] exist Figure 8 , Figure 10 , Figure 16 , Figure 23 In one embodiment, the sealing pin 115 covers the entire clamping part 112 and the first column 1111. The sealing pin 115 is welded to the clamping part 112, thereby sealing the mounting hole 1116 to seal the welded part 1114.

[0252] In some implementations, please refer to Figure 3 and Figure 4 The pressing part 112 is provided with a receiving groove, at least a portion of the sealing nail 115 is received in the receiving groove, the opening edge of the receiving groove is provided with a second notch and / or the periphery of the surface of the sealing nail 115 away from the welding part 1114 is provided with a third notch, the second notch, or the third notch, or the second notch and the third notch together form a first recess 116 for welding.

[0253] This can improve the connection strength between the clamping part 112 and the sealing nail 115.

[0254] In some implementations, please refer to... Figure 3 and Figure 4 The accommodating groove has a second notch at its opening edge, and the sealing pin 115 has a third notch on its peripheral surface away from the welding part 1114. The second and third notches can be closed to form a first welding recess 116. When welding the clamping part 112 and the sealing pin 115, the clamping part 112 and the sealing pin 115 can be welded within the first recess 116. Therefore, the contact area between the weld and the sealing pin 115 and the clamping part 112 can be increased, thereby improving the connection strength between the clamping part 112 and the sealing pin 115, and thus improving the overall connection sealing performance of the pole assembly 11 to a certain extent. At the same time, it can also provide a certain amount of space for the weld, preventing the weld from protruding or protruding too much, which would affect the subsequent welding of the tab and the pole assembly 11.

[0255] In some embodiments, the opening edge of the receiving groove is provided with a second notch, which can form a first recess 116. In some embodiments, the sealing pin 115 has a third notch on the periphery of its surface away from the weld portion 1114, which can form the first recess 116.

[0256] In some implementations, please refer to Figure 3 and Figure 4 The pressing part 112 includes a first pressing ring 1121 and a first flange 1122. A first insulating part 1131 is disposed between the first pressing ring 1121 and the outer shell 12. The first flange 1122 is integrally connected to the circumferential outer side of the first column 1111. The first flange 1122 presses the first insulating part 1131 through the first pressing ring 1121. The top of the first pressing ring 1121 protrudes from the top of the first flange 1122 to form a receiving groove.

[0257] Thus, the sealing of the welded part 1114 is achieved through the mutual cooperation between the sealing pin 115, the first pressure ring 1121, and the first flange 1122.

[0258] In some implementations, in Figure 3 and Figure 4 In this embodiment, the first pressure ring 1121 is disposed on the circumferential outer side of the first flange portion 1122 and riveted to the first flange portion 1122. At the same time, the first pressure ring 1121 overlaps the outer shell 12 through the first insulating portion 1131, thereby improving the riveting strength of the pole assembly 11.

[0259] The first flange 1122, through the first pressure ring 1121, limits and presses the first insulating portion 1131 in place, thereby ensuring that the first insulating portion 1131 tightly fills the gap between the first pressure ring 1121 and the outer casing 12, thus achieving electrical insulation between the outer casing 12 and the first pressure ring 1121. The top of the first pressure ring 1121 protrudes from the top of the first flange 1122, thereby limiting the loosening or displacement of the first flange 1122 in the radial direction of the opening 124 and ensuring stable assembly position.

[0260] A receiving groove is formed on the first pressure ring 1121 and the first flange 1122. At least a portion of the sealing pin 115 is received in the receiving groove to cover at least a portion of the pressing part 112 and the first column 1111. The periphery of the surface of the sealing pin 115 away from the welding part 1114 is welded to the groove wall of the receiving groove. Thus, the welding part 1114 can be sealed by the mutual cooperation between the sealing pin 115 and the first pressure ring 1121 and the first flange 1122, thereby improving the reliability of the battery cell 10 to a certain extent.

[0261] In some implementations, please refer to Figure 3 , Figure 4 , Figure 5 The first pressure ring 1121 has an opening for receiving groove. The first pressure ring 1121 has a third chamfer structure 1121e or a third rounded corner structure 1121f at the edge of the opening of the receiving groove. The third chamfer structure 1121e or the third rounded corner structure 1121f has a second notch. The sealing nail 115 has a fourth chamfer structure 1153 or a fourth rounded corner structure 1154 on the periphery of the surface away from the welding part 1114. The fourth chamfer structure 1153 or the fourth rounded corner structure 1154 has a third notch.

[0262] This can reduce stress concentration.

[0263] In some implementations, in one implementation, please refer to Figure 3 , Figure 4 The first pressure ring 1121 has a third chamfered structure 1121e at the opening edge of the receiving groove, and the third chamfered structure 1121e forms a second notch; and the sealing pin 115 has a fourth chamfered structure 1153 at the periphery of the surface away from the welding part 1114, and the fourth chamfered structure 1153 forms a third notch; the second notch and the second notch together form a first recess 116. Therefore, the cross-section of the first recess 116 is approximately V-shaped.

[0264] In one implementation, please refer to Figure 5The first pressure ring 1121 has a third rounded corner structure 1121f at the opening edge of the receiving groove, and the third rounded corner structure 1121f forms a second notch; and the sealing pin 115 has a fourth rounded corner structure 1154 at the periphery of the surface away from the welding part 1114, and the fourth rounded corner structure 1154 forms a third notch; the second notch and the second notch together form a first recess 116. Therefore, the cross-section of the first recess 116 is approximately U-shaped.

[0265] Therefore, the above structure can increase the effective welding cross-sectional area and disperse the welding stress at the connection between the clamping part 112 and the sealing nail 115 to a certain extent, thereby improving the overall tensile and shear strength of the pole assembly 11 and ensuring the reliability of the battery cell 10.

[0266] In some implementations, please refer to Figure 3 , Figure 4 , Figure 4a , Figure 5 , Figure 5a The height of the first pressure ring 1121 is greater than the height of the first flange 1122, and the height difference between the first pressure ring 1121 and the first flange 1122 is h1. The dimension of the third chamfer structure 1121e in the radial direction of the opening 124 is L3, and the maximum thickness of the third chamfer structure 1121e is L4. Wherein, 0.5 h1≤L3≤h1, 0.5 h1≤L4≤h1; The radius of the third rounded corner structure 1121f is r2, 0.5. h1≤r2≤h1.

[0267] This improves the reliability of the battery cell 10 to some extent.

[0268] In some implementations, in one implementation, please refer to Figure 3 , Figure 4 , Figure 4a The first pressure ring 1121 has a third chamfer structure 1121e at the opening edge of the receiving groove, and the third chamfer structure 1121e forms a second notch. The radial dimension L3 of the third chamfer structure 1121e in the opening 124 satisfies 0.5. h1≤L3≤h1, and the maximum thickness L4 satisfies 0.5 h1≤L4≤h1 can ensure connection strength while avoiding excessive stress concentration that could damage the terminal assembly 11, and prevent internal electrolyte from seeping out from the gaps, thereby improving the reliability of the battery cell 10 to a certain extent.

[0269] In some examples, L3 = 0.5 h1, 0.55 h1, 0.6 h1, 0.65 h1, 0.7 h1, 0.75 h1, 0.8 h1, 0.85 h1, 0.9 h1, 0.95 h1, h1, or greater than or equal to 0.5 h1 and other values ​​less than or equal to h1.

[0270] In some examples, L4 = 0.5 h1, 0.55 h1, 0.6 h1, 0.65 h1, 0.7 h1, 0.75 h1, 0.8 h1, 0.85 h1, 0.9 h1, 0.95 h1, h1, or greater than or equal to 0.5 h1 and other values ​​less than or equal to h1.

[0271] In one implementation, please refer to Figure 5 and Figure 5a The first pressure ring 1121 has a third rounded corner structure 1121f at the opening edge of the receiving groove, and the third rounded corner structure 1121f forms a second notch. The radius r2 of the third rounded corner structure 1121f is set to satisfy 0.5. h1≤r2≤h1 can ensure connection strength while avoiding excessive stress concentration that could damage the terminal assembly 11, and prevent internal electrolyte from seeping out from the gaps, thereby ensuring the reliability of the battery cell 10 to a certain extent.

[0272] In some examples, r² = 0.5 h1, 0.55 h1, 0.6 h1, 0.65 h1, 0.7 h1, 0.75 h1, 0.8 h1, 0.85 h1, 0.9 h1, 0.95 h1, h1, or greater than or equal to 0.5 h1 and other values ​​less than or equal to h1.

[0273] It is understandable that the specific value of h1 can be limited according to the actual situation, and this application does not make a specific limit on it.

[0274] In some implementations, please refer to Figures 8 to 11 , Figures 16 to 17a , Figure 23 and Figure 24 The sealing pin 115 covers the pressing part 112 and the pole post 111. The surface of the sealing pin 115 away from the pressing part 112 is provided with a second groove 1151 or a sixth notch 1152.

[0275] This avoids the solder mark protruding or protruding too much, which could interfere with the welding of the bar and the sealing nail 115.

[0276] In some implementations, in one implementation, please refer to Figure 10 , Figure 11 and Figures 16 to 17a The sealing nail 115 has a second groove 1151 on its surface away from the clamping part 112. When the sealing nail 115 and the clamping part 112 are subjected to through welding, the sealing nail 115 and the clamping part 112 can be welded in the second groove 1151. The second groove 1151 provides a hidden space for the weld mark, avoiding the weld mark from protruding or protruding too much and interfering with the welding of the bar and the sealing nail 115. At the same time, reducing the thickness of the sealing nail 115 can make the welding power smaller and the heat-affected zone smaller.

[0277] In one implementation, please refer to Figure 8 , Figure 9 , Figure 23 and Figure 24 The sealing nail 115 has a sixth notch 1152 on its surface away from the clamping part 112. When performing through welding on the sealing nail 115 and the clamping part 112, the sealing nail 115 and the clamping part 112 can be welded in the sixth notch 1152. The sixth notch 1152 provides space for the weld stamp, avoiding the weld stamp from protruding or protruding too much and interfering with the welding of the bar and the sealing nail 115. At the same time, reducing the thickness of the sealing nail 115 can make the welding power smaller and the heat-affected zone smaller.

[0278] Understandably, in Figures 8 to 11 , Figures 16 to 17a , Figure 23 and Figure 24 In this embodiment, the sealing pin 115 can cover the radial gap between the first flange 1122 and the first pressure ring 1121. Moreover, in the axial direction of the opening 124, the radial gap corresponds to the second groove 1151 or the sixth notch 1152, so that the second groove 1151 or the sixth notch 1152 can accommodate welding residue while the sealing pin 115 is welded to the first flange 1122 and the first pressure ring 1121, thus avoiding subsequent interference with the welding of the metal sheet.

[0279] In some implementations, please refer to Figure 9 and Figure 11 The thickness t5 of the portion of the sealing pin 115 corresponding to the second groove 1151 or the sixth notch 1152 satisfies 0.5 mm ≤ t5 ≤ 2 mm.

[0280] In this way, the welding strength is guaranteed while avoiding interference between the solder joint and the sealing nail 115.

[0281] In some embodiments, t5 satisfies 0.5 mm ≤ t5 ≤ 2 mm. When 0.5 mm ≤ t5, it can avoid the situation where the thickness is too small, resulting in the welding part of the sealing nail 115 being too thin and the connection strength being insufficient. When t5 ≤ 2 mm, it can avoid the situation where the thickness is too large, resulting in the second groove 1151 or the sixth notch 1152 being too shallow and the weld mark protruding from the surface of the sealing nail 115, thus ensuring that the welding of the bar and the sealing nail 115 is not interfered with by the weld mark.

[0282] In some examples, t5 = 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, or other values ​​greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0283] In some implementations, please refer to Figure 6 , Figure 14 , Figure 21 The sealing nail 115 is located at the end of the mounting hole 1116 away from the welding part 1114 and is connected to the first column 1111.

[0284] Thus, the sealing of the welded part 1114 is achieved through the mutual cooperation between the sealing nail 115 and the first column 1111.

[0285] In some implementations, in Figure 6 , Figure 14 , Figure 21 In this embodiment, the sealing pin 115 is located inside the mounting hole 1116 and is welded to the end wall of the mounting hole 1116 away from the welding part 1114 so that the sealing pin 115 is connected to the first column 1111. Thus, the welding part 1114 can be sealed by the mutual cooperation between the sealing pin 115 and the first column 1111, thereby improving the reliability of the battery cell 10 to a certain extent.

[0286] In some implementations, please refer to Figure 6 and Figure 7The sealing nail 115 has a fourth notch on the periphery of the surface away from the weld 1114, and / or the mounting hole 1116 has a fifth notch on the edge of the opening at one end away from the weld 1114. The fourth notch, or the fifth notch, or the fourth notch and the fifth notch together form a second recess 117 for welding.

[0287] This can improve the connection strength between the sealing nail 115 and the first column 1111.

[0288] In some implementations, please refer to... Figure 7 The sealing pin 115 has a fourth notch on its peripheral surface away from the welding part 1114, and the mounting hole 1116 has a fifth notch on the edge of its opening away from the welding part 1114. The fourth and fifth notches can be closed to form a second recess 117 for welding. When welding the first post 1111 to the sealing pin 115, the welding can be performed within the second recess 117. Therefore, the contact area between the weld and the sealing pin 115 and the first post 1111 can be increased, thereby improving the connection strength between the first post 1111 and the sealing pin 115, and thus improving the overall connection sealing performance of the pole assembly 11 to a certain extent. At the same time, it can also provide a certain amount of space for the weld, preventing the weld from protruding and affecting the subsequent welding of the tab to the pole assembly 11.

[0289] In some embodiments, the sealing pin 115 has a fourth notch on its peripheral surface away from the weld portion 1114, which can form a second recess 117. In some embodiments, the mounting hole 1116 has a fifth notch on the edge of its opening away from the weld portion 1114, which can form a second recess 117.

[0290] Secondly, embodiments of this application provide a battery device that includes the battery cell 10 of any of the above embodiments.

[0291] In one embodiment, the battery device further includes a housing for providing accommodating space for individual battery cells 10. One or more battery cells 10 are disposed within the housing. Within the housing, multiple battery cells 10 can be electrically connected in series, parallel, or a hybrid configuration via tabs. A hybrid configuration refers to multiple battery cells 10 being connected in both series and parallel configurations. The shape and specific structure of the housing can be specifically defined according to actual circumstances, and this application does not impose specific limitations in this regard. In one example, the housing may include a first housing and a second housing, which overlap each other to jointly define an accommodating space for housing the battery cells 10.

[0292] Thirdly, embodiments of this application provide an electrical device that includes the battery device described in the above embodiments.

[0293] In some embodiments, the electrical device includes one or more battery devices. In one embodiment, multiple battery devices are connected in series via a busbar to increase the voltage of the electrical device. In another embodiment, multiple battery devices may also be electrically connected in parallel or in a mixed configuration. In some embodiments, the electrical device may include an energy storage device, with the battery devices housed within the casing of the energy storage device for storing electrical energy and providing power to a load when needed. In some embodiments, the electrical device may include an electric vehicle, with the battery devices located at the bottom, front, or rear of the electric vehicle for powering the vehicle as its operating power and / or drive power.

[0294] It should be noted that the above explanation of the implementation method and beneficial effects of the battery cell 10 also applies to the battery device and power consumption device of the embodiments of this application. To avoid redundancy, it will not be elaborated in detail here.

[0295] 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, combinations, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; The housing has a receiving cavity and an opening, the opening being connected to the receiving cavity, and the receiving cavity accommodating the electrode assembly; A terminal assembly is mounted on the housing. The terminal assembly includes a clamping part, a terminal, and an insulating member. The terminal passes through the opening. The insulating member includes at least a first insulating portion, which is at least located between the clamping part and the housing. The electrode post is connected to the electrode assembly, the clamping part is connected to the electrode post, and the clamping part clamps the first insulating part in a direction close to the outer shell; The dimension e of the clamping part in the radial direction of the opening satisfies 0.5 mm ≤ e ≤ 23 mm.

2. The battery cell according to claim 1, characterized in that, The dimension e of the clamping part in the radial direction of the opening satisfies 0.5 mm ≤ e ≤ 10 mm.

3. The battery cell according to claim 1 or 2, characterized in that, The pole post includes a first column and a second column arranged coaxially. The second column passes through the opening. The first column connects the second column and the pressing part. The outer diameter of the first column is less than or equal to the outer diameter of the second column.

4. The battery cell according to claim 3, characterized in that, The pressing part includes a pressing ring and a first flange. The first insulating part is disposed between the pressing ring and the outer shell. The first flange is integrally connected to the circumferential outer side of at least one of the first column and the second column. The first flange presses the first insulating part with the pressing ring. The dimension b1 of the first flange in the radial direction of the opening satisfies 0.5 mm ≤ b1 ≤ 5 mm.

5. The battery cell according to claim 4, characterized in that, The first flange portion has a dimension b1 in the radial direction of the opening that satisfies 0.5 mm ≤ b1 ≤ 3 mm.

6. The battery cell according to claim 4 or 5, characterized in that, The pressure ring includes a first pressure ring located outside the receiving cavity, and a first flange connected to the circumferential outer side of the first column. The first flange presses the first insulating portion against the first pressure ring.

7. The battery cell according to claim 6, characterized in that, The outer diameter of the first column is smaller than the outer diameter of the second column. The first column, the second column, and the first flange together form a first notch. The first pressure ring includes a first body and a first riveting part that are connected to each other. The first body is connected to the side of the first riveting part away from the second column. At least a portion of the first riveting part is embedded in the first notch.

8. The battery cell according to claim 7, characterized in that, The portion of the first riveting part embedded in the first notch is an embedded section, and the thickness t2 of the embedded section satisfies 0.4 mm ≤ t2 ≤ 2 mm.

9. The battery cell according to claim 7, characterized in that, The thickness t3 of the first body satisfies 0.4 mm ≤ t3 ≤ 3 mm.

10. The battery cell according to claim 7, characterized in that, The first body and the first riveting part are connected by a first chamfer structure or a first rounded corner structure. The portion of the first flange facing the first chamfer structure or the first rounded corner structure is provided with a second chamfer structure or a second rounded corner structure. The first chamfer structure and the second chamfer structure are connected in a cooperative manner, or the first rounded corner structure and the second rounded corner structure are connected in a cooperative manner.

11. The battery cell according to claim 10, characterized in that, The thickness of the first flange is t11, the dimension of the first chamfer structure in the radial direction of the opening is L1, and the maximum thickness of the first chamfer structure is L2, wherein 0.2 t11≤L1≤0.7 t11, 0.2 t11≤L2≤0.7 t11; The radius of the first rounded corner structure is r1, where 0.2 t11≤r1≤0.7 t11.

12. The battery cell according to claim 11, characterized in that, The thickness t11 of the first flanged part satisfies 0.5 mm ≤ t11 ≤ 3 mm.

13. The battery cell according to claim 6, characterized in that, The first pressure ring is a circular ring of equal thickness or the thickness difference between the thickest and thinnest parts of the first pressure ring is ±0.03 mm to ±0.2 mm.

14. The battery cell according to claim 4 or 5, characterized in that, The pressure ring includes a second pressure ring, at least a portion of which is located in the opening. The first flange is connected to the circumferential outer side of the first column and / or the second column, and the first flange is pressed against the first insulating portion by the second pressure ring.

15. The battery cell according to claim 14, characterized in that, The second pressure ring includes a second body, a second riveting part, and a third riveting part. The second body passes through the opening. The second riveting part and the third riveting part are respectively connected to both ends of the second body. The second riveting part is located on the circumferential outer side of the second body, and the third riveting part is located on the circumferential inner side of the second body. The first flange portion is pressed against the third riveting portion, so that the third riveting portion, through the second body, drives the second riveting portion to press the first insulating portion.

16. The battery cell according to claim 14, characterized in that, The thickness t12 of the first flanged part satisfies 0.4 mm ≤ t12 ≤ 3 mm.

17. The battery cell according to claim 3, characterized in that, The clamping part is a second flange integrally connected to the outer circumferential side of at least one of the first column and the second column.

18. The battery cell according to any one of claims 3-17, characterized in that, The pole post also includes a limiting part, which is connected to the circumferential outer side of the end of the second post away from the first post. The insulating component further includes a second insulating portion, which separates the outer shell from the electrode assembly, and the limiting portion presses the second insulating portion against the inner wall of the outer shell; And / or the pole assembly further includes a seal, the limiting portion pressing the seal against the inner wall of the housing.

19. The battery cell according to claim 18, characterized in that, The second insulating part is connected to the first insulating part through the seal, and the second insulating part and the seal are integrally formed or separately disposed.

20. The battery cell according to claim 18, characterized in that, The second insulating part and the first insulating part are integrally formed.

21. The battery cell according to claim 18, characterized in that, The first insulating part and the second insulating part may be made of the same or different materials, and the material of the seal may be different from the material of the first insulating part or the second insulating part.

22. The battery cell according to claim 18, characterized in that, The seal is connected to the outer circumferential side of the second column.

23. The battery cell according to claim 18, characterized in that, The outer radial dimension of the axial projection of the seal is d6, the diameter of the opening is d3, and the outer diameter of the second column is d2, wherein d2+0.8 mm≤d3≤d6-2 mm.

24. The battery cell according to claim 18, characterized in that, The limiting part includes a third column and a fourth column. The second column, the third column, and the fourth column are coaxially arranged. The third column is connected between the second column and the fourth column. The third column protrudes from the fourth column in the height direction. The third column presses a part of the sealing member against the inner wall of the housing. The fourth column presses a part of the second insulating part against the inner wall of the housing.

25. The battery cell according to claim 24, characterized in that, The seal covers the radial gap between the second insulating portion and the third column.

26. The battery cell according to claim 24, characterized in that, The outer radial dimension of the axial projection of the seal is d6, the diameter of the opening is d3, and the outer diameter of the third column is d4, wherein d3+2 mm≤d4≤d6.

27. The battery cell according to claim 18, characterized in that, In the radial direction of the opening, the seal is spaced apart from the second insulating portion to form a clearance space.

28. The battery cell according to any one of claims 1-17, characterized in that, The first insulating portion has a first limiting structure on its surface facing the pressing portion, and the pressing portion has a second limiting structure on its surface facing the first insulating portion. The first limiting structure and the second limiting structure are connected to limit the relative position between the first insulating portion and the pressing portion.

29. The battery cell according to claim 28, characterized in that, The first limiting structure includes one of a protrusion and a groove, and the second limiting structure includes the other of the protrusion and the groove, wherein at least a portion of the protrusion is embedded in the groove.

30. The battery cell according to claim 29, characterized in that, The protrusion includes an annular protrusion and / or a plurality of protruding segments spaced apart along the circumferential direction of the pole post, and the groove includes an annular groove and / or a plurality of groove segments adapted to the plurality of protruding segments.

31. The battery cell according to claim 29, characterized in that, The wall thickness of the protrusion is less than the width of the groove.

32. The battery cell according to claim 29, characterized in that, The height of the protrusion is greater than the depth of the groove.

33. The battery cell according to claim 29, characterized in that, The volume of the protrusion is 0.8 to 1.5 times the volume of the groove.

34. The battery cell according to any one of claims 1-17, characterized in that, The electrode post includes a welding part, the battery cell also includes a current collector, the electrode assembly includes a tab, the current collector is connected between the welding part and the tab, and the welding part is located outside or inside the receiving cavity.

35. The battery cell according to claim 34, characterized in that, The welding part is located outside the receiving cavity. The pole post also includes a first column and a second column arranged coaxially. The second column passes through the opening. The first column connects the second column and the pressing part. The pole post is provided with a mounting hole that passes through the first column and the second column. The welding part is connected to the mounting hole wall corresponding to the first column. The connecting part of the collector plate extends into the mounting hole and is connected to the welding part.

36. The battery cell according to claim 35, characterized in that, The connecting portion forms a first cavity, and the first cavity satisfies at least one of the following conditions: The axial dimension h2 of the opening satisfies 0 < h2 ≤ 5 mm; The radial dimension d7 of the opening satisfies 1mm≤d7≤20mm; The ratio of the dimension h2 in the axial direction of the opening to the dimension h3 in the axial direction of the pole is T = h2 / h3, where 0 < T ≤ 0.

95.

37. The battery cell according to claim 35, characterized in that, The welded part has at least one first groove on the surface opposite to the collector plate.

38. The battery cell according to claim 37, characterized in that, The portion of the welded part corresponding to the first groove is a thinned part, and the thickness t4 of the thinned part satisfies 0.5 mm ≤ t4 ≤ 2 mm.

39. The battery cell according to claim 37, characterized in that, The shape of the at least one first groove includes at least one of the following: circular, annular, fan-shaped, and strip-shaped. The first grooves are arranged concentrically in a ring shape, the first grooves are arranged in a ring at intervals in a fan shape, and the first grooves are arranged radially in a strip shape.

40. The battery cell according to claim 34, characterized in that, The welding part is located in the receiving cavity. The pole post also includes a first column and a second column arranged coaxially. The second column passes through the opening. The first column connects the second column and the pressing part. The pole post is provided with a mounting hole that passes through the first column and the second column. The welding part is connected to the hole wall of the mounting hole corresponding to the second column. The pole assembly further includes a sealing pin that connects at least a portion of the clamping portion and at least one of the first poles.

41. The battery cell according to claim 40, characterized in that, The sealing pin covers at least a portion of the clamping part and the first column.

42. The battery cell according to claim 41, characterized in that, The clamping part is provided with a receiving groove, at least a portion of the sealing nail is received in the receiving groove, the opening edge of the receiving groove is provided with a second notch and / or the surface periphery of the sealing nail away from the welding part is provided with a third notch, the second notch, or the third notch, or the second notch and the third notch together form a first recess for welding.

43. The battery cell according to claim 42, characterized in that, The clamping part includes a first pressure ring and a first flange. The first insulating part is disposed between the first pressure ring and the outer shell. The first flange is integrally connected to the circumferential outer side of the first column. The first flange presses the first insulating part with the first pressure ring. The top of the first pressure ring protrudes from the top of the first flange to form the receiving groove.

44. The battery cell according to claim 43, characterized in that, The first pressure ring has an opening for the receiving groove. The first pressure ring has a third chamfer structure or a third rounded corner structure at the edge of the opening of the receiving groove. The third chamfer structure or the third rounded corner structure has a second notch. The sealing nail has a fourth chamfer structure or a fourth rounded corner structure on the periphery of the surface away from the welding part. The fourth chamfer structure or the fourth rounded corner structure has the third notch.

45. The battery cell according to claim 44, characterized in that, The height of the first pressure ring is greater than the height of the first flange, the height difference between the first pressure ring and the first flange is h1, the dimension of the third chamfer structure in the radial direction of the opening is L3, and the maximum thickness of the third chamfer structure is L4, wherein 0.5 h1≤L3≤h1, 0.5 h1≤L4≤h1; The radius of the third rounded corner structure is r2, 0.5 h1≤r2≤h1.

46. ​​The battery cell according to claim 41, characterized in that, The sealing pin covers the clamping part and the pole post, and a second groove or a sixth notch is provided on the surface of the sealing pin away from the clamping part.

47. The battery cell according to claim 46, characterized in that, The thickness t5 of the portion of the sealing pin corresponding to the second groove or the sixth notch satisfies 0.5 mm ≤ t5 ≤ 2 mm.

48. The battery cell according to claim 40, characterized in that, The sealing pin is located at the end of the mounting hole away from the welded part and is connected to the first column.

49. The battery cell according to claim 48, characterized in that, The sealing pin has a fourth notch on the periphery of the surface away from the welded part, and / or the mounting hole has a fifth notch on the opening edge of one end away from the welded part. The fourth notch, or the fifth notch, or the fourth notch and the fifth notch together form a second recess for welding.

50. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-49.

51. An electrical device, characterized in that, Includes the battery device as described in claim 50.

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