Current collecting needle, cover plate assembly, and battery

Abstract

A current collecting needle, a cover plate assembly, and a battery, relating to the technical field of batteries. The current collecting needle comprises a body, wherein the peripheral surface of the body is provided with grooves. By providing the peripheral surface of the body with the grooves, the space occupied by the current collecting needle in the battery can be controlled, and the outer surface area of the current collecting needle can also be increased, such that the contact area between the current collecting needle and a positive electrode can be increased, thereby increasing the current collecting area of the current collecting needle.

Description

Current collecting needle, cover plate assembly and battery

[0001] This application claims priority to Chinese patent applications with application numbers 202410460455.5, 202420793926.X and 202420793895.8, respectively, filed on April 16, 2024 with the China Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a current collecting needle, a cover plate assembly and a battery. BACKGROUND

[0003] In the related art, lithium sub-batteries are a type of battery that uses lithium metal or lithium alloy as a negative electrode material and uses a non-aqueous electrolyte solution. The lithium sub-battery includes a shell, a positive electrode, a negative electrode, an edge film, a bottom film, an upper cover film, and a cover plate assembly that seals the shell. The cover plate assembly includes a cover plate, a pole that is insulated and isolated from the cover plate by glass sealing, and a current collecting needle that connects the pole to the positive electrode. SUMMARY

[0004] Due to the small size of the current collecting needle, the current collecting area of the current collecting needle is small, which results in a small discharge current of the lithium sub-battery using the current collecting needle, thereby limiting the application range of the lithium sub-battery. If the size of the current collecting needle is increased to increase the current collecting area, the space occupied by the current collecting needle in the battery will also be increased, which has an adverse effect on the energy density of the lithium sub-battery.

[0005] The present application provides a current collecting needle, a cover plate assembly and a battery, which can improve the problem of small current collecting area of the current collecting needle.

[0006] In a first aspect, the present application provides a current collecting needle, which includes a body, and a groove is arranged on the outer circumferential surface of the body.

[0007] In a second aspect, the present application provides a cover plate assembly, which includes a cover plate, a pole and the aforementioned current collecting needle; the cover plate is provided with a mounting hole; the pole is arranged in the mounting hole and connected to the cover plate through an insulating sealing element; one end of the body is connected to the pole.

[0008] In a third aspect, the present application provides a battery, which includes the aforementioned current collecting needle or the aforementioned cover plate assembly. ADVANTAGEOUS EFFECTS

[0009] In the present application, by arranging a groove on the outer circumferential surface of the body, the space occupied by the current collecting needle in the battery can be controlled, and the outer surface area of the current collecting needle can be increased, thereby the contact area between the current collecting needle and the positive electrode can be increased, and the current collecting area of the current collecting needle can be increased. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a structural schematic diagram of a current collecting needle according to an embodiment of the present application;

[0011] Fig. 2 is an enlarged view of A in Fig. 1 according to an embodiment of the present application;

[0012] Fig. 3 is a structural schematic diagram of another current collecting needle according to an embodiment of the present application;

[0013] Fig. 4 is an enlarged view of B in Fig. 3 according to an embodiment of the present application;

[0014] Fig. 5 is an enlarged view of C in Fig. 1 according to an embodiment of the present application;

[0015] Fig. 6 is a structural schematic diagram of a cover plate assembly according to an embodiment of the present application;

[0016] Fig. 7 is a structural schematic diagram of another cover plate assembly according to an embodiment of the present application;

[0017] Fig. 8 is an enlarged view of D in Fig. 7 according to an embodiment of the present application;

[0018] Fig. 9 is a structural schematic diagram of still another cover plate assembly according to an embodiment of the present application;

[0019] Fig. 10 is an enlarged view of F in Fig. 9 according to an embodiment of the present application;

[0020] Fig. 11 is an enlarged view of E in Fig. 6 according to an embodiment of the present application;

[0021] Fig. 12 is a structural schematic diagram of another positioning support in a cover plate assembly according to an embodiment of the present application;

[0022] Fig. 13 is a structural schematic diagram of still another positioning support in a cover plate assembly according to an embodiment of the present application;

[0023] Fig. 14 is an enlarged view of H in Fig. 12 according to an embodiment of the present application;

[0024] Fig. 15 is an enlarged view of I in Fig. 12 according to an embodiment of the present application;

[0025] Fig. 16 is a structural schematic diagram of still another positioning support in a cover plate assembly according to an embodiment of the present application;

[0026] Fig. 17 is a structural schematic diagram of a battery according to an embodiment of the present application;

[0027] Fig. 18 is an enlarged view of G in Fig. 17 according to an embodiment of the present application;

[0028] Fig. 19 is a structural schematic diagram of another battery according to an embodiment of the present application;

[0029] Fig. 20 is a structural schematic diagram of still another battery according to an embodiment of the present application;

[0030] FIG. 21 is a structural schematic diagram of another battery according to an embodiment of the present application.

[0031] Legend of reference signs:

[0032] 001 - cover plate assembly; 011 - current collecting needle; 111 - body; 112 - groove; 1121 - first arc surface; 1122 - second arc surface; 1123 - third arc surface; 1124 - fourth arc surface; 1111 - hollow structure; 1112 - upper end through hole; 1113 - lower end through hole; 1114 - variable diameter section; 1115 - chamfer; 113 - head; 114 - middle part; 115 - tail; 012 - cover plate; 121 - mounting hole; 122 - annular boss; 123 - liquid injection hole; 124 - first annular groove; 125 - boss; 013 - pole; 131 - shaft shoulder; 014 - insulating sealing element; 015 - positioning bracket; 151 - abutting part; 1511 - first through hole; 1512 - main body; 1523 - contact part; 152 - sleeving part; 153 - positioning ring;

[0033] 002 - battery; 021 - shell; 022 - bottom film; 023 - edge film; 024 - negative electrode; 025 - positive electrode; 026 - upper cover film; 027 - sealing nail;

[0034] 015 - positioning bracket; 051 - limiting plate; 111a - fitting hole; 112a - second flange; 1121a - cylindrical surface; 113a - first flange; 114a - third through hole; 052 - abutting element; 121a - barrel; 122a - ring; 123 - second outer flange; 1231 - second through hole; 124 - first outer flange; 053 - first insulating element; 133 - protrusion; 132 - sunken platform; 054 - second insulating element. Embodiments of the present application

[0035] Referring to FIG. 1, which is a structural schematic diagram of the current collecting needle 011 according to an embodiment of the present application. An embodiment of the present application provides a current collecting needle 011, which comprises a body 111. The outer circumferential surface of the body 111 is provided with a groove 112.

[0036] It can be understood that the structure and shape of the groove 112 are not limited, and the groove 112 can be a plurality of grooves distributed along the circumferential direction and axial direction of the current collecting needle 011; the groove 112 can also be an annular groove, a helical groove, etc.

[0037] In addition, when the current collecting needle 011 is applied to a lithium sub-battery, the current collecting needle 011 is inserted into the positive electrode, and the outer circumferential surface of the body 111 and the inner wall of the groove 112 are in contact with the positive electrode.

[0038] In the embodiment, by arranging the groove 112 on the outer circumferential surface of the body 111, the space occupied by the current collecting needle 011 in the battery can be controlled, and the outer surface area of the current collecting needle 011 can be increased, so that the contact area between the current collecting needle 011 and the positive electrode can be increased, and the current collecting area of the current collecting needle 011 can be increased. Therefore, the discharge current of the lithium sub-battery using the current collecting needle 011 is large, so that the application range of the lithium sub-battery can be expanded.

[0039] In addition, under the premise of the same outer diameter as other current collecting needles 011, the current collecting needle 011 provided in the embodiment can fill the positive electrode in the groove 112 by arranging the groove 112 on the outer circumferential surface of the body 111, so that the space occupied by the current collecting needle 011 in the battery can be reduced, and the energy density of the lithium sub-battery can be improved.

[0040] In an embodiment, the groove 112 is arranged along the circumference of the body 111. It can be understood that the groove 112 can be an annular groove or a spiral groove extending along the circumference of the body 111, or can be a plurality of grooves arranged at intervals along the circumference of the body 111.

[0041] When the groove 112 is an annular groove extending along the circumference of the body 111, please refer to FIG. 2, which is an enlarged view of A in FIG. 1 provided by the embodiment of the application. Specifically, the groove 112 is an annular groove, and the axis of the annular groove is parallel to the axis of the current collecting needle 011.

[0042] Alternatively, the axis of the annular groove is arranged in line with the axis of the current collecting needle 011.

[0043] In the embodiment, by the above arrangement, the current collecting needle 011 has a central symmetry structure, so that the stress state of the current collecting needle 011 can be improved, and the reliability of the current collecting needle 011 can be improved.

[0044] Please refer to FIG. 1. In an embodiment, the annular groove has a plurality of annular grooves, and the plurality of annular grooves are arranged in sequence along the extension direction of the axis of the current collecting needle 011.

[0045] Specifically, the plurality of annular grooves are arranged in sequence and uniformly spaced along the axis of the current collecting needle 011.

[0046] In the embodiment, by arranging a plurality of annular grooves, on the one hand, the surface area of the current collecting needle 011 can be increased, so that an embedded structure is formed between the positive electrode and the current collecting needle 011, thereby increasing the contact area between the current collecting needle 011 and the positive electrode, and increasing the current collecting area of the current collecting needle 011 and improving the current collecting effect of the current collecting needle 011; on the other hand, the integrity of the current collecting needle 011 and the positive electrode can be improved, thereby improving the reliability of the cooperation between the current collecting needle 011 and the positive electrode.

[0047] Please refer to FIG. 1 or 2, in an embodiment, the surface between the two adjacent annular grooves is a first arc surface 1121, the first arc surface 1121 is convexly arranged away from the axis of the current collecting needle 011, and the two sides of the first arc surface 1121 are smoothly connected with the groove walls of the adjacent annular grooves.

[0048] In the embodiment, through the above arrangement, the stress of the current collecting needle 011 between the two annular grooves is more uniform, thereby the possibility of local stress concentration can be reduced, and the structural stability and durability of the current collecting needle 011 can be improved.

[0049] Please refer to FIG. 1 or 2, in an embodiment, the groove bottom wall of the annular groove is a second arc surface 1122, the second arc surface 1122 is concavely arranged close to the axis of the current collecting needle 011, and the two sides of the second arc surface 1122 are smoothly connected with the adjacent first arc surfaces 1121.

[0050] In the embodiment, through the above arrangement, on the one hand, the filling of the positive electrode in the groove body 112 is better, and the empty area is avoided; on the other hand, the stress of the current collecting needle 011 at the annular groove is more uniform, thereby the possibility of local stress concentration can be reduced, and the structural stability and durability of the current collecting needle 011 can be improved.

[0051] In addition, when the groove body 112 extends along the circumference of the body 111 as a spiral groove, please refer to FIG. 3, which is a structural schematic diagram of another current collecting needle 011 provided by the embodiment of the application. The groove body 112 is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting needle 011.

[0052] Optionally, the spiral center line of the spiral groove is arranged in line with the axis of the current collecting needle 011.

[0053] In the embodiment, by arranging the groove body 112 as a spiral groove, an embedded structure is formed between the positive electrode and the current collecting needle 011, thereby the current collecting needle 011 has more contact area with the positive electrode, and the current collecting area of the current collecting needle 011 can be increased, and the current collecting effect of the current collecting needle 011 can be improved.

[0054] In addition, by arranging the groove body 112 as a spiral groove, the current collecting needle 011 can be rotated into the positive electrode, thereby the resistance of the positive electrode to the assembly of the current collecting needle 011 can be reduced. Thus, on the one hand, the efficiency of the assembly of the current collecting needle 011 to the positive electrode can be improved, and on the other hand, the integrity of the current collecting needle 011 and the positive electrode can be improved, thereby the reliability of the cooperation between the current collecting needle 011 and the positive electrode can be improved.

[0055] Please refer to FIG. 4, which is an enlarged view of B in FIG. 3 provided by the embodiment of the present application. In an embodiment, the groove bottom wall of the spiral groove is a third arc surface 1123, which is concave relative to the axis of the current collecting pin 011, and the two sides of the third arc surface 1123 are smoothly connected with the outer circumferential surface of the body 111.

[0056] In the embodiment, through the above arrangement, on the one hand, the filling of the positive electrode in the groove body 112 is better, and the empty area is avoided; on the other hand, the stress of the current collecting pin 011 at the groove body 112 is more uniform, so that the possibility of local stress concentration can be reduced, and thus the structural stability and durability of the current collecting pin 011 can be improved.

[0057] Please refer to FIG. 2, in an embodiment, the maximum outer diameter of the body 111 is D, the radius of the first arc surface 1121 is R1, and it satisfies: 0 < R1≤ 0.2D; and / or, the radius of the second arc surface 1122 is R2, and it satisfies: 0 < R2≤ 0.2D.

[0058] Specifically, the radius of the first arc surface 1121 is R1, and it satisfies: 0 < R1≤ 0.2D; or, the radius of the second arc surface 1122 is R2, and it satisfies: 0 < R2≤ 0.2D; or, the radius of the first arc surface 1121 is R1, and it satisfies: 0 < R1≤ 0.2D, and the radius of the second arc surface 1122 is R2, and it satisfies: 0 < R2≤ 0.2D.

[0059] Wherein, R1 and R2 can be, but are not limited to, 0.01D, 0.02D, 0.05D, 0.06D, 0.08D, 0.1D, 0.12D, 0.15D, 0.16D, 0.18D, 0.19D, 0.2D.

[0060] Exemplarily:

[0061] When D is 1mm, R1 and R2 can be, but are not limited to, 0.01mm, 0.03mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.11mm, 0.12mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm;

[0062] When D is 1.5mm, R1 and R2 can be, but are not limited to, 0.01mm, 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.14mm, 0.17mm, 0.2mm, 0.22mm, 0.24mm, 0.28mm, 0.3mm;

[0063] When D is 2 mm, R1 and R2 can be, but are not limited to, 0.01 mm, 0.08 mm, 0.14 mm, 0.19 mm, 0.2 mm, 0.26 mm, 0.29 mm, 0.3 mm, 0.33 mm, 0.36 mm, 0.38 mm, 0.4 mm;

[0064] When D is 2.5 mm, R1 and R2 can be, but are not limited to, 0.01 mm, 0.08 mm, 0.16 mm, 0.18 mm, 0.22 mm, 0.26 mm, 0.31 mm, 0.35 mm, 0.39 mm, 0.41 mm, 0.45 mm, 0.5 mm;

[0065] Specifically, 0.1D≤R1≤0.2D and 0.1D≤R2≤0.2D.

[0066] In this embodiment, by limiting the radius of the first arc surface 1121 to R1, the radius can be prevented from being too large to cause the maximum outer diameter of the current collecting needle 011 to be large, so that the maximum outer diameter of the current collecting needle 011 can be controlled, and the current collecting needle 011 can be prevented from occupying a large space inside the battery. By limiting the radius of the second arc surface 1122 to R2, the radius can be prevented from being too large to cause the minimum outer diameter of the current collecting needle 011 to be too small, so that the resistance of the current collecting needle 011 when inserted into the positive electrode can be controlled, and the installation convenience of the current collecting needle 011 can be improved.

[0067] In an embodiment, the radius of the first arc surface 1121 is R1, and the radius of the second arc surface 1122 is R2, and R2

[0068] Specifically, 0

[0069] In this embodiment, by the above limitation, on the basis of controlling the width of the cross section of the current collecting needle 011, the radius of the first arc surface 1121 can be large, so that the strength of the first arc surface 1121 can be improved, the ability of the first arc surface 1121 to withstand external pressure and impact force can be improved, and damage of the current collecting needle 011 caused by collision during transportation, storage, assembly and the like can be reduced.

[0070] The width of the cross section of the current collecting needle 011 is the distance between the side of the second arc surface 1122 close to the axis of the current collecting needle 011 and the side of the first arc surface 1121 away from the axis of the current collecting needle 011 in the radial direction of the current collecting needle 011. By controlling the width, the resistance of the current collecting needle 011 when inserted into the positive electrode can be controlled, and the assembly efficiency can be improved.

[0071] Please refer to Fig. 2, in an embodiment, the axis of the current collecting needle 011 is in a plane, the first arc surface 1121 has an arc of π, the second arc surface 1122 has an arc of π, and the first arc surface 1121 is tangent to the adjacent second arc surface 1122.

[0072] It can be understood that the tangent position between the first arc surface 1121 and the second arc surface 1122 is a circle arranged around the axis of the current collecting needle 011. The tangent positions on both sides of the first arc surface 1121 are arranged along the axis of the current collecting needle 011.

[0073] In the embodiment, through the above arrangement, on the one hand, the surface structure of the current collecting needle 011 can be simplified, the number of smooth connecting curved surfaces between the first arc surface 1121 and the second arc surface 1122 can be controlled, so that the manufacturing complexity of the current collecting needle 011 can be reduced; on the other hand, by making the first arc surface 1121 tangent to the second arc surface 1122, the number of surface transition structures of the current collecting needle 011 can be avoided, so that stress concentration can be reduced, and then the stress state of the current collecting needle 011 can be improved.

[0074] In an embodiment, the number of the first arc surfaces 1121 is m, the number of the second arc surfaces 1122 is n, and m = n + 1, where m and n are both natural numbers greater than 0.

[0075] It can be understood that the second arc surface 1122 is arranged between two adjacent first arc surfaces 1121. Correspondingly, the first arc surface 1121 close to the head 113 is connected with the outer circumferential surface of the head 113, and the first arc surface 1121 close to the tail 115 is connected with the outer circumferential surface of the tail 115, as shown in Fig. 1.

[0076] In the embodiment, through the above arrangement, the current collecting needle 011 can have more first arc surfaces 1121, so that the structural strength of the current collecting needle 011 can be improved; and the first arc surface 1121 can be connected with the outer circumferential surface of the head 113 and the outer circumferential surface of the tail 115, so that the connection strength between the middle part 114 and the head 113 and between the middle part 114 and the tail 115 can be improved.

[0077] Please refer to Fig. 4, in an embodiment, at least part of the outer circumferential surface of the body 111 is a spiral surface, the spiral surface is a fourth arc surface 1124, the fourth arc surface 1124 is arranged outwardly away from the axis of the current collecting needle 011, and the two sides of the fourth arc surface 1124 are respectively smoothly connected with the adjacent third arc surfaces 1123.

[0078] It can be understood that part of the outer circumferential surface of the body 111 is a spiral surface, and the whole outer circumferential surface of the body 111 can also be a spiral surface. Specifically, part of the outer circumferential surface of the body 111 is used to form a spiral groove, and the other part forms a spiral surface based on the spiral groove.

[0079] In the embodiment, by the above setting, the current collecting needle 011 is more uniform in force between adjacent groove walls, thereby reducing the possibility of local stress concentration, and further improving the structural stability and durability of the current collecting needle 011.

[0080] Referring to FIG. 4, in an embodiment, the maximum outer diameter of the body 111 is D, the radius of the third arc surface 1123 is R3, and 0 < R3 ≤ 0.2D is satisfied; and / or, the radius of the fourth arc surface 1124 is R4, and 0 < R4 ≤ 0.2D is satisfied.

[0081] Specifically, the radius of the third arc surface 1123 is R3, and 0 < R3 ≤ 0.2D is satisfied; or, the radius of the fourth arc surface 1124 is R4, and 0 < R4 ≤ 0.2D is satisfied; or, the radius of the third arc surface 1123 is R3, and 0 < R3 ≤ 0.2D is satisfied, and the radius of the fourth arc surface 1124 is R4, and 0 < R4 ≤ 0.2D is satisfied.

[0082] Wherein, R3 and R4 can be, but are not limited to, 0.01D, 0.02D, 0.05D, 0.06D, 0.08D, 0.1D, 0.12D, 0.15D, 0.16D, 0.18D, 0.19D, 0.2D.

[0083] Exemplarily:

[0084] When D is 1mm, R3 and R4 can be, but are not limited to, 0.01mm, 0.03mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.11mm, 0.12mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm;

[0085] When D is 1.5mm, R3 and R4 can be, but are not limited to, 0.01mm, 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.14mm, 0.17mm, 0.2mm, 0.22mm, 0.24mm, 0.28mm, 0.3mm;

[0086] When D is 2mm, R3 and R4 can be, but are not limited to, 0.01mm, 0.08mm, 0.14mm, 0.19mm, 0.2mm, 0.26mm, 0.29mm, 0.3mm, 0.33mm, 0.36mm, 0.38mm, 0.4mm;

[0087] When D is 2.5 mm, R3 and R4 can be, but are not limited to, 0.01 mm, 0.08 mm, 0.16 mm, 0.18 mm, 0.22 mm, 0.26 mm, 0.31 mm, 0.35 mm, 0.39 mm, 0.41 mm, 0.45 mm, 0.5 mm;

[0088] Specifically, 0.1D≤R3≤0.2D and 0.1D≤R4≤0.2D.

[0089] In this embodiment, by limiting the radius of the third arc surface 1123 to R3, the maximum outer diameter of the current collecting needle 011 can be controlled, so that the current collecting needle 011 does not occupy too much space in the battery.

[0090] In an embodiment, the radius of the third arc surface 1123 is R3, and the radius of the fourth arc surface 1124 is R4, which satisfies R3

[0091] Specifically, 0

[0092] In this embodiment, by the above limitation, on the basis of controlling the width of the cross section of the current collecting needle 011, the radius of the fourth arc surface 1124 can be made larger, so that the strength of the fourth arc surface 1124 can be improved, and the ability of the fourth arc surface 1124 to withstand external pressure and impact force can be improved, reducing damage to the current collecting needle 011 during transportation, storage, assembly, etc.

[0093] The width of the cross section of the current collecting needle 011 is the distance between the side of the third arc surface 1123 close to the axis of the current collecting needle 011 and the side of the fourth arc surface 1124 away from the axis of the current collecting needle 011 along the radial direction of the current collecting needle 011. By controlling the width, the resistance of the current collecting needle 011 to the positive electrode can be controlled, so that the assembly efficiency can be improved.

[0094] Referring to FIG. 4, in an embodiment, a cross section is taken along a plane in which the axis of the current collecting needle 011 is located, the third arc surface 1123 has an arc of π, the fourth arc surface 1124 has an arc of π, and the third arc surface 1123 is tangent to the adjacent fourth arc surface 1124.

[0095] In the embodiment, through the above setting, on the one hand, the surface structure of the current collecting needle 011 can be simplified, the number of curved surfaces for smoothly connecting between the third arc surface 1123 and the fourth arc surface 1124 is controlled, so that the manufacturing complexity of the current collecting needle 011 can be reduced; on the other hand, by tangency between the third arc surface 1123 and the fourth arc surface 1124, the transition structure on the surface of the current collecting needle 011 can be avoided, so that stress concentration can be reduced, and then the stress state of the current collecting needle 011 can be improved.

[0096] Please refer to FIG. 1 or FIG. 3, in an embodiment, the body 111 is a hollow structure 1111.

[0097] Specifically, the body 111 is an equal-wall-thickness structure, and is a thin-wall structure.

[0098] In the embodiment, by setting the hollow structure 1111 on the body 111, the thickness of the body 111 can be reduced, so that the body 111 has greater elasticity, especially when the body 111 is a thin-wall structure, the elasticity is greater. Thus, the contact pressure between the current collecting needle 011 and the positive electrode can be increased, so that the reliability of the contact between the current collecting needle 011 and the positive electrode can be increased, which is beneficial to enhancing the current collecting effect of the current collecting needle 011.

[0099] In addition, by setting the body 111 as an equal-wall-thickness structure, the stress on the current collecting needle 011 can be more uniform, so that the possibility of local stress concentration can be reduced, and then the compression resistance of the current collecting needle 011 can be improved, and finally the structural stability and durability of the current collecting needle 011 can be improved.

[0100] Please refer to FIG. 1 and FIG. 5, FIG. 5 is an enlarged view of C in FIG. 1 provided by the embodiment of the application. In an embodiment, the two ends of the body 111 are respectively provided with an upper end through hole 1112 and a lower end through hole 1113 which are in communication with the inside of the body 111.

[0101] In the embodiment, through the above setting, when the battery is assembled and electrolyte is injected, a part of the electrolyte can flow into the hollow structure 1111 from the upper end through hole 1112, and be discharged to the positive electrode from the lower end through hole 1113, so that the infiltration efficiency of the battery can be improved.

[0102] Please refer to FIG. 5, in an embodiment, the two ends of the body 111 are respectively a top end and a bottom end, the top end is configured to be connected with the pole 013 of the battery, the body 111 has a variable diameter section 1114 located at the bottom end, and the outer diameter of the variable diameter section 1114 gradually decreases in the direction away from the top end.

[0103] It can be understood that when the battery is assembled, the current collecting needle 011 is inserted into the positive electrode after the negative electrode, the bottom film, the edge film, the positive electrode and the top film are placed in the shell 1. In the embodiment, by arranging the variable diameter section 1114 at the end of the current collecting needle 011 away from the top end, the resistance of the current collecting needle 011 inserted into the positive electrode can be reduced, the stress state of the current collecting needle 011 can be improved, and the assembly efficiency can be improved.

[0104] In addition, the lower end through hole 1113 is arranged on the end face of the bottom end.

[0105] Please refer to FIG. 5, in an embodiment, a chamfer 1115 is arranged between the outer circumferential surface of the body 111 and the end face of the bottom end.

[0106] Exemplarily, the chamfer 1115 is a round chamfer 1115.

[0107] In the embodiment, by the above arrangement, on the one hand, the resistance of the current collecting needle 011 inserted into the positive electrode can be reduced; on the other hand, the stress state of the bottom end of the current collecting needle 011 can be improved, so that the structural stability and durability of the current collecting needle 011 can be improved.

[0108] In an embodiment, a conductive layer is arranged on the outer circumferential surface of the body 111 and / or the inner wall of the groove body 112, and the conductive layer is one or more of a nickel plating layer, a gold plating layer and a carbon coating layer.

[0109] It can be understood that the outer circumferential surface of the body 111 is provided with a conductive layer, or the inner wall of the groove body 112 is provided with a conductive layer, or the outer circumferential surface of the body 111 and the inner wall of the groove body 112 are both provided with a conductive layer.

[0110] In the embodiment, by the above arrangement, the current collecting needle 011 can improve the current collecting effect.

[0111] Please refer to FIG. 1 or FIG. 3, in an embodiment, along the axial direction of the current collecting needle 011, the body 111 includes a head 113, a middle part 114 and a tail 115 connected in sequence, and the groove body 112 is arranged in the middle part 114.

[0112] Among them, the maximum outer diameter of the middle part 114 is greater than the maximum outer diameter of the head 113 and the maximum outer diameter of the tail 115.

[0113] It can be understood that the head 113 is used for connecting with the pole of the battery, the tail 115 is directed to the bottom of the battery, and is used for guiding the insertion of the current collecting needle 011 into the positive electrode.

[0114] In the embodiment, by the above arrangement, the groove 112 can be avoided to be arranged at the head 113 and the tail 115. In this way, on the one hand, the outer surface of the head 113 is flat, so that the head 113 can be clamped to be welded with the pole, and on the other hand, the resistance of the tail 115 can be reduced, so that the resistance of the tail 115 to be inserted into the positive electrode can be reduced.

[0115] Referring to FIG. 1 or FIG. 3, in an embodiment, the length of the body 111 is L0, and the length of the middle part 114 is L1, and 0 < L1 ≤ 0.7L0 is satisfied.

[0116] It can be understood that L1 can be, but is not limited to, 0.1L0, 0.2L0, 0.25L0, 0.3L0, 0.4L0, 0.5L0, 0.6L0, 0.65L0, 0.66L0, or 0.7L0.

[0117] For example, when L0 is 20 mm, L1 can be, but is not limited to, 2 mm, 4 mm, 4.6 mm, 5 mm, 6 mm, 7.3 mm, 8.8 mm, 9 mm, 10 mm, 10.5 mm, 11 mm, or 14 mm.

[0118] In the embodiment, by the above arrangement, the length of the groove 112 can be avoided to be too long to affect the arrangement of the head 113 and the tail 115, so that the reliability of the connection between the head 113 and the pole can be improved, and the smoothness of the insertion of the current collecting needle 011 into the positive electrode can be improved.

[0119] Referring to FIG. 6, FIG. 6 is a structural schematic diagram of a cover plate assembly 001 provided by an embodiment of the application. An embodiment of the application provides a cover plate assembly 001. The cover plate assembly 001 includes a cover plate 012, a pole 013, and a current collecting needle 011 disclosed by some embodiments of the application. The cover plate 012 is provided with a mounting hole 121. The pole 013 is arranged in the mounting hole 121, and the pole 013 is connected with the cover plate 012 through an insulating sealing element 014. One end of the body 111 is connected with the pole 013.

[0120] For example, the insulating sealing element 014 is a glass insulator, and the glass insulator forms a glass seal between the pole 013 and the mounting hole 121 to seal the pole 013 and the mounting hole 121.

[0121] In addition, the pole 013 can be directly welded with the current collecting needle 011, or the two can be first inserted and then welded.

[0122] In the embodiment, by adopting the current collector needle 011 disclosed in some embodiments of the present application, the current collector needle 011 can control the space occupied in the battery and increase the outer surface area of the current collector needle 011, thereby increasing the contact area of the current collector needle 011 with the positive electrode and further increasing the current collection area of the current collector needle 011. Thus, the discharge current of the lithium sub-battery using the cover plate assembly 001 is large, thereby expanding the application range of the lithium sub-battery.

[0123] Referring to FIG. 7, FIG. 7 is a structural schematic diagram of another cover plate assembly 001 provided by an embodiment of the present application. In an embodiment, the cover plate assembly 001 is applied to a lithium sub-battery, and the cover plate assembly 001 further comprises a positioning bracket 015. The positioning bracket 015 is sleeved on the pole 013 and / or the current collector needle 011 and is in abutting stop cooperation with the pole 013. The positioning bracket 015 has an abutting part 151 configured to abut against the positive electrode of the lithium sub-battery.

[0124] In the embodiment, the positioning bracket 015 is sleeved on the pole 013, or the positioning bracket 015 is sleeved on the current collector needle 011, or a part of the positioning bracket 015 is sleeved on the pole 013 and a part of the positioning bracket 015 is sleeved on the current collector needle 011.

[0125] It can be understood that the positive electrode will swell after being soaked in electrolyte and will also swell during discharging. When the height of the swelled positive electrode exceeds the height of the negative electrode 024, on the one hand, the current collection effect will be poor, thereby causing poor discharging; on the other hand, the positive electrode will flow to the negative electrode 024, thereby causing short circuit of the battery.

[0126] Based on this, in the embodiment, by providing the positioning bracket 015, the swelling of the positive electrode can be limited when the positive electrode swells, thereby ensuring the current collection effect and improving the consistency between the designed discharging capacity and the actual discharging capacity of the battery.

[0127] Referring to FIG. 8, FIG. 8 is a structural schematic diagram of the bracket provided by an embodiment of the present application. In an embodiment, the positioning bracket 015 comprises a sleeving part 152 and an abutting part 151. The sleeving part 152 is sleeved on the pole 013 / current collector needle 011 and is in abutting stop cooperation with the pole 013. One end of the sleeving part 152 away from the cover plate 012 is connected with the abutting part 151. The abutting part 151 is arranged to extend from the sleeving part 152 to a direction away from the axis of the current collector needle 011.

[0128] Referring to FIG. 9 and FIG. 10, FIG. 9 is a structural schematic diagram of another cover plate assembly 001 provided by an embodiment of the present application, and FIG. 10 is an enlarged view of F in FIG. 9. In an embodiment, the positioning bracket 015 is a conductor, and the abutting part 151 comprises a main body 1512 and a contact part 1513 protruding from the surface of the main body 1512 to the positive electrode of the battery cell. The contact part 1513 is configured to contact the positive electrode of the lithium sub-battery.

[0129] It can be understood that the contact portion 1513 can be arranged at any position of the main body 1512, for example, an end of the main body 1512 close to the sleeve portion 152 or an end of the main body 1512 away from the sleeve portion 152.

[0130] Correspondingly, a hole or an opening is arranged on the upper cover film at a position opposite to the contact portion 1513, so that the contact portion 1513 can contact the positive electrode after passing through the upper cover film.

[0131] In this embodiment, the positioning support 015 can serve as a current collecting member between the positive electrode and the pole 013, so that the current collecting area between the pole 013 and the positive electrode can be increased, and the current collecting effect can be improved.

[0132] Please refer to FIG. 9 and FIG. 10. In an embodiment, the contact portion 1513 is arranged between the main body 1512 and the sleeve portion 152, and two ends of the contact portion 1513 are connected with the main body 1512 and the sleeve portion 152 respectively.

[0133] In this embodiment, the contact portion 1513 is arranged adjacent to the pole 013, so that the current collecting path of the contact portion 1513 can be shortened, and the current collecting effect can be improved.

[0134] Please refer to FIG. 8. In an embodiment, the positioning support 015 further comprises a positioning ring 153, which is located between the abutting portion 151 and the cover plate 012, and one end of the positioning ring 153 away from the cover plate 012 is connected with the periphery of the abutting portion 151.

[0135] It can be understood that the lithium sub-battery comprises, from outside to inside, the current collecting needle 011, the positive electrode, the edge film 023, the negative electrode 024 and the shell 021. In order to improve the limiting of the positioning support 015 to the expansion of the positive electrode, the outer diameter of the abutting portion 151 is consistent with the outer diameter of the positive electrode. The outer periphery of the abutting portion 151 faces the edge film 023. If the outer periphery of the abutting portion 151 is directly opposite to the edge film 023, the corner of the outer periphery of the abutting portion 151 may scratch the edge film 023.

[0136] Based on this, in this embodiment, by arranging the positioning ring 153, the corner of the outer periphery of the abutting portion 151 can be prevented from directly contacting the edge film 023, so that the edge film 023 can be prevented from being scratched by the abutting portion 151, and the reliability of the battery can be improved.

[0137] Please refer to FIG. 8, which is an enlarged view of D in FIG. 7 provided by the embodiment of the application. In an embodiment, the abutting portion 151 is provided with a first through hole 1511 for the electrolyte to flow.

[0138] Exemplarily, the first through hole 1511 is provided in plurality, and the plurality of first through holes 1511 are distributed along the circumferential direction and the radial direction of the abutting portion 151.

[0139] In the embodiment, by the above arrangement, when the electrolyte is injected after the battery assembly is completed, the electrolyte can flow into the positive electrode from the first through hole 1511, which is conducive to the battery soaking.

[0140] Referring to FIG. 8, in an embodiment, the pole 013 has a shoulder 131, and a large diameter section of the pole 013 is located on the side of the shoulder 131 away from the positioning support 015, and the positioning support 015 abuts against the shoulder 131.

[0141] In the embodiment, by arranging the shoulder 131, the positioning support 015 abuts against the shoulder 131, so that the positioning support 015 is in stop cooperation with the pole 013, and the position stability of the positioning support 015 is improved, so that the positioning support 015 is stably positioned at the position limiting the expansion of the positive electrode.

[0142] In addition to the structure of the positioning support 015 provided in the above embodiments of the application, the embodiments of the application also provide another structure of the positioning support 015. Referring to FIG. 12 or FIG. 13, FIG. 12 is a schematic view of another structure of the positioning support 015 in the cover plate assembly 001 provided in the embodiments of the application, and FIG. 13 is a schematic view of another structure of the positioning support 015 in the cover plate assembly 001 provided in the embodiments of the application. In the embodiments of the application, the cover plate assembly 001 is applied to a lithium sub-battery. The positioning support 015 in the embodiment includes a limiting plate 051, an abutting member 052, and a first insulating member 053. The limiting plate 051 is provided with a cooperating hole 111a, and the limiting plate 051 is configured to limit the expansion of the positive electrode of the lithium sub-battery. The abutting member 052 is arranged on the side of the limiting plate 051 away from the positive electrode, and the abutting member 052 is configured to abut against the inner wall of the shell of the lithium sub-battery or the pole of the lithium sub-battery along the radial direction of the cooperating hole 111a. The first insulating member 053 is arranged on the abutting member 052, and the first insulating member 053 is configured to insulate and isolate the abutting member 052 from the component abutting against the abutting member 052. The current collecting needle 011 is arranged in the cooperating hole 111a.

[0143] It can be understood that when the abutting member 052 is configured to abut against the inner wall of the shell of the lithium sub-battery along the radial direction of the cooperating hole 111a, the first insulating member 053 is located on the side of the abutting member 052 close to the inner wall of the shell, as shown in FIG. 12; and when the abutting member 052 is configured to abut against the pole along the radial direction of the cooperating hole 111a, the first insulating member 053 is located on the side of the abutting member 052 close to the pole, as shown in FIG. 13.

[0144] Generally, a part of the lithium sub-battery is collected by the current collecting needle or the current collecting rod, and the current collecting needle / rod is coaxially connected with the pole column. Another part of the lithium sub-battery is collected by the current collecting cylinder, and the current collecting cylinder is connected with the pole column through the pole lug. Therefore, in order to avoid the interference between the positioning support 015 and the pole lug, the positioning support 015 disclosed in the embodiments of the present application which abuts against the pole column is mainly applied to the lithium sub-battery collected by the current collecting needle or the current collecting rod. The positioning support 015 disclosed in the embodiments of the present application which abuts against the inner wall of the shell of the lithium sub-battery can be applied to the lithium sub-battery collected by the current collecting needle or the current collecting rod, and can also be applied to the lithium sub-battery collected by the current collecting cylinder.

[0145] The first insulating piece 053 can be glued to the abutting piece 052, or can be formed on the abutting piece 052 by an injection molding process. The limiting plate 051 and the abutting piece 052 can be integrally formed, or can be integrally connected by welding. The material thereof can be, but is not limited to, stainless steel material, pure nickel material, stainless steel plated with nickel, cold-rolled carbon steel plated with nickel, etc. The material of the first insulating piece 053 can be, but is not limited to, polytetrafluoroethylene material.

[0146] In addition, the frictional force between the abutting piece 052 and the component abutting against the abutting piece 052 is smaller than the pushing force of the positive electrode liquid absorption expansion on the positioning support 015. Therefore, when the electrolyte is injected, the positive electrode liquid absorption expansion can contact and push the positioning support 015 to move.

[0147] In the present embodiment, by applying the positioning support 015 to the lithium sub-battery, after the positive electrode liquid absorption expansion generates an upward pushing force on the positioning support 015, the positioning support 015 can move upward along with the expansion of the positive electrode until the positive electrode completes the liquid absorption expansion. At this time, the position of the positioning support 015 is consistent with the height of the positive electrode after completing the liquid absorption expansion, so that the position of the positioning support 015 can be adaptively adjusted based on the expansion height of the positive electrode after the liquid absorption, and thus the position of the positioning support 015 can be matched with the liquid absorption expansion height of the positive electrode. Therefore, the positioning support 015 can be prevented from being damaged due to a large positive electrode upward pushing force, and the gap between the positive electrode and the positioning support 015 can be avoided to cause poor discharge of the lithium sub-battery.

[0148] In addition, by abutting the positioning support 015 against the pole column or the inner wall of the shell, the liquid absorption expansion of the positive electrode can also be inhibited to a certain extent to avoid the positive electrode from expanding too high, so that the consistency of the discharge capacity and the actual discharge capacity of the lithium sub-battery can be improved.

[0149] Please refer to FIG. 12. In an embodiment, when the abutting piece 052 is configured to abut against the inner wall of the shell along the radial direction of the fitting hole 111a, the abutting piece 052 is arranged on the periphery of the limiting plate 051. Correspondingly, the first insulating piece 053 is arranged on the side of the abutting piece 052 close to the inner wall of the shell.

[0150] In the embodiment, the abutting member 052 is arranged on the periphery of the limiting plate 051, so that the abutting member 052 and the limiting plate 051 can be formed by one-time stamping, thereby improving the manufacturing efficiency of the positioning support 015.

[0151] Referring to FIG. 12, in an embodiment, the abutting member 052 is a cylindrical structure. One end of the abutting member 052 is connected with the periphery of the limiting plate 051. The outer wall of the abutting member 052 is configured to abut with the inner wall of the shell along the radial direction of the fitting hole 111a.

[0152] For example, when applied to a lithium sub-battery, the abutting member 052 is coaxially arranged with the pole column.

[0153] In the embodiment, by arranging the abutting member 052 as a cylindrical structure, the abutting surface between the positioning support 015 and the lithium sub-battery is more and more symmetrical, thereby improving the stress state of the positioning support 015 and the shell of the lithium sub-battery, avoiding excessive stress concentration, and thereby improving the reliability.

[0154] Referring to FIG. 12, in an embodiment, the first insulating member 053 extends to one end of the abutting member 052 away from the limiting plate 051.

[0155] It can be understood that when the lithium sub-battery is discharged at high temperature, the positive electrode expands to a high degree, thereby pushing up the positioning support 015. When the positioning support 015 is moved up to a high degree, there is a risk of short circuiting with the cover plate.

[0156] Based on this, in the embodiment, by the above arrangement, when the positioning support 015 is pushed up by the expanded positive electrode to the cover plate, the positioning support 015 can be insulated from the cover plate, thereby improving the reliability and facilitating normal discharge of the lithium sub-battery.

[0157] In an embodiment, the first insulating member 053 is an elastic insulating member.

[0158] In the embodiment, by arranging the first insulating member 053 as an elastic insulating member, when the positive electrode expands to push up the positioning support 015 so that the positioning support 015 abuts with the cover plate, the first insulating member 053 is compressed. When the positive electrode of the lithium sub-battery contracts, the positioning support 015 can be pushed down based on the deformation recovery force of the first insulating member 053, so that the positioning support 015 is reset to maintain the limiting effect on the positive electrode. In this way, the matching of the position of the positioning support 015 and the height of the positive electrode can be improved, thereby improving the consistency of the discharge capacity and the actual discharge capacity of the lithium sub-battery, and thereby improving the reliability of the lithium sub-battery.

[0159] Referring to FIG. 14, FIG. 14 is an enlarged view of H in FIG. 12. In an embodiment, one end of the first insulating member 053 away from the limiting plate 051 is provided with a protrusion 133.

[0160] In the embodiment, the protrusion 133 can increase the deformation amount of the first insulating piece 053, so that the deformation recovery force of the first insulating piece 053 after being pressed can be increased, and the deformation recovery force of the first insulating piece 053 can ensure that the positioning support 015 is pushed down to a position consistent with the height of the positive electrode.

[0161] Referring to FIG. 14, in an embodiment, the protrusion 133 extends along the circumference of the fitting hole 111a in a ring structure, or the protrusion 133 has a plurality of protrusions 133, and the plurality of protrusions 133 are arranged at intervals along the circumference of the fitting hole 111a.

[0162] In the embodiment, the above arrangement can increase the contact surface between the protrusion 133 and the cover plate, so as to improve the stress state of the cover plate, avoid damage to the cover plate caused by stress concentration, and further improve the reliability of the lithium sub-battery.

[0163] Referring to FIG. 12, in an embodiment, the abutting piece 052 includes a cylinder 121a and a ring 122a. One end of the cylinder 121a is connected to the circumference of the limiting plate 051. The other end of the cylinder 121a is provided with a second outward turning edge 123. The outer circumference of the second outward turning edge 123 is connected to one end of the ring 122a. The ring 122a is sleeved on the end of the cylinder 121a away from the limiting plate 051. The outer wall of the ring 122a is configured to abut against the inner wall of the shell along the radial direction of the fitting hole 111a. The outer wall of the ring 122a is provided with the first insulating piece 053.

[0164] For example, the ring 122a, the cylinder 121a, the second outward turning edge 123, and the limiting plate 051 are integrally formed, specifically, are stamped.

[0165] In the embodiment, the above arrangement makes the overall structure of the positioning support 015 simple and easy to manufacture, so as to control the manufacturing cost of the lithium sub-battery.

[0166] Referring to FIG. 14, in an embodiment, the second outward turning edge 123 is provided with a second through hole 1011. The first insulating piece 053 extends into the second through hole 1011 and is connected to the hole wall of the second through hole 1011.

[0167] Since the first insulating piece 053 and the abutting piece 052 are made of different materials, the bonding strength therebetween is weak, which can easily cause the end of the first insulating piece 053 close to the fitting hole 111a to separate from the abutting piece 052.

[0168] Based on this, in the embodiment, the above arrangement can enhance the connection strength between the first insulating piece 053 and the abutting piece 052, so as to improve the connection reliability between the first insulating piece 053 and the abutting piece 052.

[0169] Please refer to Figure 14, in an embodiment, the positioning support 015 further comprises a second insulating piece 054. The second insulating piece 054 is arranged on one side of the second outward turning side 123 close to the limiting plate 051. The second insulating piece 054 is connected with the part of the first insulating piece 053 in the second through hole 1011.

[0170] Wherein, the first insulating piece 053 and the second insulating piece 054 can be the same material, and are both formed on the abutting part 052 through injection molding process. Specifically, the abutting part and the limiting plate 051 are first formed integrally, and then placed in the injection mold, and then the injection liquid is filled into the cavity of the mold, and after the injection liquid solidifies, the positioning support 015 with the first insulating piece 053 and the second insulating piece 054 is formed.

[0171] In the embodiment, through the above arrangement, when the first insulating piece 053 is away from the abutting part at the end close to the cooperating hole 111a, the second insulating piece 054 provides a pulling force to the first insulating piece 053 to limit the first insulating piece 053 from being away from the abutting part, thereby improving the reliability of the connection between the first insulating piece 053 and the abutting part.

[0172] Please refer to Figure 14, in an embodiment, the ring body 122a is arranged in the first insulating piece 053.

[0173] In the embodiment, through the above arrangement, the connecting surface between the first insulating piece 053 and the ring body 122a can be increased, thereby improving the reliability of the connection between the ring body 122a and the first insulating piece 053 to avoid separation of each other.

[0174] Please refer to Figure 12, in an embodiment, the cylinder body 121a is a conical cylinder, and the small diameter end of the conical cylinder is arranged close to the limiting plate 051.

[0175] Wherein, in the longitudinal section of the cylinder body 121a, the included angle between the conical surface of the cylinder body 121a and the axis of the cylinder body 121a is 2°~5°, which can be but is not limited to 2°, 2.5°, 3°, 3.1°, 3.8°, 4°, 4.7°, 5°.

[0176] In the embodiment, through the above arrangement, the positioning support 015 is connected as a whole by the cylinder body 121a with the limiting plate 051 abutting against the positive electrode and the end part abutting against the inner wall of the shell. In this way, on the one hand, the interference between the cylinder body 121a and the edge film can be avoided, and on the other hand, the distance between the positioning support 015 and the negative electrode can be increased. Therefore, the reliability of the lithium sub-battery can be improved.

[0177] Referring to FIG. 12, in an embodiment, a second flange 112a is arranged on the periphery of the fitting hole 111a along the axial direction of the fitting hole 111a, and the second flange 112a is located on the side of the limiting plate 051 close to the abutting member 052. The second flange 112a is sleeved on the current collecting pin 011.

[0178] In the embodiment, a chamfer, specifically a round chamfer, is arranged at the connection between the second flange 112a and the limiting plate 051.

[0179] It can be understood that some lithium sub-batteries are provided with other components in the middle, and in the embodiment, the second flange 112a is arranged to enable the positioning bracket to contact the other components through the second flange 112a during installation, so as to avoid scratching the end of the fitting hole 111a against the other components.

[0180] The chamfer arranged at the connection between the second flange 112a and the limiting plate 051 can guide the installation of the positioning bracket 015, so as to reduce the scratching of the other components by the positioning bracket 015 during installation.

[0181] Referring to FIG. 12, in an embodiment, the inner periphery of the second flange 112a is a conical surface, and the large-diameter end of the conical surface is arranged close to the limiting plate 051.

[0182] In the longitudinal section of the second flange 112a, the included angle between the inner periphery of the second flange 112a and the axis of the second flange 112a is 1°-10°, which can be, but is not limited to, 1°, 2.5°, 4°, 5.1°, 6.8°, 8°, 9.7°, or 10°.

[0183] In the embodiment, the above arrangement can improve the guidance during installation of the positioning bracket, so as to avoid scratching of the other components by the positioning bracket 015.

[0184] Referring to FIG. 15, which is an enlarged view of I in FIG. 12, in an embodiment, the inner periphery of the second flange 112a close to one end of the limiting plate 051 is a conical surface, and the other end is a cylindrical surface 1121a.

[0185] In the embodiment, after the positioning bracket 015 is assembled in place, the cylindrical surface 1121a is in contact with the other components, so as to increase the contact area between the positioning bracket 015 and the other components, thereby improving the stress state of the other components and avoiding local stress concentration. In this way, the reliability of the lithium sub-battery can be improved.

[0186] Referring to FIG. 14, in an embodiment, the outer periphery of the first insulating member 053 close to one end of the limiting plate 051 is provided with a chamfer, specifically a round chamfer.

[0187] In the embodiment, the chamfer guides the installation of the positioning support 015 through the opening of the shell, so as to reduce the collision and installation resistance when the positioning support 015 is installed into the shell, thereby improving the installation efficiency.

[0188] Referring to FIG. 13, in an embodiment, the abutting piece 052 is arranged at the periphery of the fitting hole 111a when the abutting piece 052 is configured to abut the pole in the radial direction of the fitting hole 111a. Correspondingly, the first insulating piece 053 is arranged at the side of the abutting piece 052 close to the pole.

[0189] In the embodiment, the abutting piece 052 is arranged at the periphery of the fitting hole 111a, so that the abutting piece 052 and the limiting plate 051 can be formed by one-time stamping, thereby improving the manufacturing efficiency of the positioning support 015.

[0190] Referring to FIG. 13, in an embodiment, the abutting piece 052 is a cylindrical structure, one end of the abutting piece 052 is connected with the periphery of the fitting hole 111a, the abutting piece 052 is configured to be sleeved on the pole, and the inner wall of the abutting piece 052 is configured to abut the pole in the radial direction of the fitting hole 111a.

[0191] In the embodiment, the abutting piece 052 is arranged as a cylindrical structure, so that the abutting surface between the positioning support 015 and the lithium sub-battery is more and more symmetrical, thereby improving the stress state of the positioning support 015 and the shell of the lithium sub-battery, avoiding excessive stress concentration, and thereby improving the reliability.

[0192] Referring to FIG. 13, in an embodiment, the first insulating piece 053 extends to the end of the abutting piece 052 away from the limiting plate 051.

[0193] It can be understood that when the lithium sub-battery is discharged at high temperature, the positive electrode has a high expansion amount, so that the positioning support 015 is pushed upward. When the positioning support 015 is moved upward to a high height, there is a risk of short circuit due to contact with the cover plate.

[0194] Based on this, in the embodiment, the positioning support 015 is pushed upward by the expanded positive electrode to the cover plate, and can be insulated from the cover plate, thereby improving the reliability and facilitating normal discharge of the lithium sub-battery.

[0195] In an embodiment, the first insulating piece 053 is an elastic insulating piece.

[0196] In the embodiment, by setting the first insulating piece 053 as an elastic insulating piece, when the positioning support 015 is pushed up to abut against the cover plate in the expansion of the positive electrode, the first insulating piece 053 is compressed. When the positive electrode of the lithium sub-battery shrinks, the positioning support 015 can be pushed down based on the deformation recovery force of the first insulating piece 053 to reset the positioning support 015 to keep the limiting effect on the positive electrode. Thus, the matching of the position of the positioning support 015 and the height of the positive electrode can be improved, thereby improving the discharge capacity and the consistency of the actual discharge of the lithium sub-battery, and further improving the reliability of the lithium sub-battery.

[0197] Referring to FIG. 16, FIG. 16 is a structural schematic view of the positioning support 015 in another cover plate assembly 001 provided by the embodiment of the application. In an embodiment, the end of the first insulating piece 053 away from the limiting plate 051 is provided with a sunken platform 132.

[0198] In an embodiment, the sunken platform 132 is arranged around the axis of the fitting hole 111a, and the platform surface of the sunken platform 132 extends to the fitting hole 111a.

[0199] In the embodiment, by setting the sunken platform 132, the thickness of the first insulating piece 053 can be reduced, thereby increasing the deformation amount of the first insulating piece 053, and further increasing the deformation recovery force of the first insulating piece 053 after being compressed. Thus, the deformation recovery force of the first insulating piece 053 can ensure that the positioning support 015 is pushed down to a position consistent with the height of the positive electrode.

[0200] Referring to FIG. 16, in an embodiment, the outer peripheral surface of the first insulating piece 053 is a tapered surface. The small-diameter end of the tapered surface is arranged close to the limiting plate 051.

[0201] In the longitudinal section of the first insulating piece 053, the included angle between the outer peripheral surface of the first insulating piece 053 and the axis of the first insulating piece 053 is 5°-15°, which can be but is not limited to 5°, 7.5°, 8°, 9.3°, 10.8°, 12°, 13°, or 15°.

[0202] In the embodiment, by the above setting, the deformation direction of the first insulating piece 053 after being compressed is consistent, thereby improving the stress state of the first insulating piece 053 after being compressed, and further improving the reliability of the positioning support 015.

[0203] Referring to FIG. 16, in an embodiment, the end of the abutting piece 052 away from the limiting plate 051 is provided with a first outward turning edge 124, and the first outward turning edge 124 is arranged inside the first insulating piece 053.

[0204] Since the first insulating piece 053 and the abutting piece 052 are made of different materials, the bonding strength therebetween is weak, which is easy to cause the first insulating piece 053 and the abutting piece 052 to separate.

[0205] Based on this, in the embodiment, through the above setting, the connection strength between the first insulating piece 053 and the abutting piece 052 can be enhanced, so that the connection reliability between the first insulating piece 053 and the abutting piece 052 can be improved.

[0206] Please refer to FIG. 16, in an embodiment, along the axial direction of the fitting hole 111a, the outer periphery of the limiting plate 051 is provided with a first flange 113a, and the first flange 113a is located on the side of the limiting plate 051 close to the abutting piece 052.

[0207] Among them, the connecting part between the first flange 113a and the limiting plate 051 is provided with a chamfer.

[0208] It can be understood that the positive electrode of the lithium sub-battery is provided with an edge film, and in the embodiment, through the setting of the first flange 113a, the positioning bracket can be in contact with the edge film through the first flange 113a during installation, so that the end of the limiting plate 051 can be prevented from scratching the edge film.

[0209] And the chamfer is arranged at the connecting part between the first flange 113a and the limiting plate 051, which can guide the installation of the positioning bracket 015 to reduce the scratching of the edge film during the installation of the positioning bracket 015.

[0210] Please refer to FIG. 12, FIG. 13 and FIG. 16, in an embodiment, a plurality of third through holes 114a are arranged on the limiting plate 051.

[0211] Exemplarily, the third through holes 114a are in multiple groups, and the multiple groups of third through holes 114a are uniformly arranged along the axial direction of the first shaft hole, and each group of third through holes 114a includes a plurality of third through holes 114a arranged along the radial direction of the fitting hole 111a.

[0212] In the embodiment, by arranging the third through holes 114a on the limiting plate 051, the electrolyte of the lithium sub-battery can flow through the third through holes 114a, so that the flowability of the electrolyte can be improved, and the reliability of the lithium sub-battery can be improved.

[0213] In an embodiment, the limiting plate 051 is configured to have a distance of not more than 1.5 mm from the positive electrode, and / or the abutting piece 052 is configured to have a distance of not less than 2.5 mm from the cover plate of the lithium sub-battery.

[0214] Specifically, the limiting plate 051 is configured to have a distance of not more than 1.5 mm from the positive electrode, or the abutting piece 052 is configured to have a distance of not less than 2.5 mm from the cover plate of the lithium sub-battery, or the limiting plate 051 is configured to have a distance of not more than 1.5 mm from the positive electrode, and the abutting piece 052 is configured to have a distance of not less than 2.5 mm from the cover plate of the lithium sub-battery.

[0215] Exemplarily, the spacing between the limiting plate 051 and the positive electrode includes but is not limited to 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 0.1mm, 1.3mm, 1.5mm. The spacing between the abutting member 052 and the cover plate of the lithium sub-battery is 2.5mm~15mm, which includes but is not limited to 0, 2.5mm, 2.8mm, 3.3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm.

[0216] Wherein, the positioning bracket 015 can be in contact with the positive electrode when assembling the positioning bracket 015, that is, the spacing between the limiting plate 051 and the positive electrode is 0.

[0217] In the embodiment, through the above definition, on the one hand, the spacing between the limiting plate 051 and the positive electrode can be avoided to be too large to cause a gap between the positive electrode and the positioning bracket 015 after the positive electrode absorbs liquid expansion, thereby improving the discharge reliability of the lithium sub-battery; on the other hand, the positioning bracket 015 can be prevented from abutting against the cover plate when the positive electrode has not completed liquid absorption expansion, thereby improving the stress state of the cover plate.

[0218] Please refer to FIG. 8, in an embodiment, the pole column 013 is inserted into the body 111.

[0219] Specifically, the pole column 013 has a shaft shoulder 131, a small-diameter section of the pole column 013 is located on the side of the shaft shoulder 131 close to the body 111, the small-diameter section is inserted into the body 111, and the end of the body 111 abuts against the shaft shoulder 131.

[0220] It can be understood that the current impact welding process is used to weld the current collecting needle 011 on the pole column 013. Specifically, a tool is used to clamp the pole column 013 and the current collecting needle 011 respectively, and then the end faces of the two are abutted against each other, and then they are welded. However, in this process, a sufficient clamping position for the tool needs to be reserved on the pole column 013, thereby causing the height dimension of the pole column 013 to be large, and further occupying a large space inside the battery.

[0221] Based on this, in the embodiment, the pole column 013 is inserted into the body 111, thereby relatively fixing the two through the insertion, and then the current collecting needle 011 is directly welded on the pole column 013 by using laser welding, thereby not needing to reserve a clamping position for the tool on the pole column 013. Thus, the height dimension of the pole column 013 is reduced, thereby reducing the space inside the battery occupied by the pole column 013, and further filling more electrolyte, thereby improving the reliability of the battery.

[0222] Please refer to FIG. 11, which is an enlarged view of E in FIG. 6 according to an embodiment of the present application. In an embodiment, the mounting hole 121 is a two-step hole, and the small-diameter section of the two-step hole is close to the body 111. The insulating sealing member 014 is arranged between the hole wall of the mounting hole 121 and the pole 013, and is sealingly connected to the outer circumferential surface of the pole 013 and the hole wall of the mounting hole 121 respectively.

[0223] It can be understood that after the battery is injected with liquid, the sealing pin 027 needs to be press-fitted in the liquid injection hole 123 on the cover plate 012. During press-fitting, the cover plate 012 is subjected to a large impact force. The pole 013 is only fixed relative to the cover plate 012 by the sealing insulating member. Therefore, when the sealing pin 027 is press-fitted, it will have an adverse effect on the sealing between the pole 013 and the cover plate 012.

[0224] Based on this, in the present embodiment, by arranging the mounting hole 121 as a two-step hole, the area of the contact surface between the sealing insulating member and the mounting hole 121 can be increased, thereby reducing the adverse effect of press-fitting the sealing pin 027 on the sealing between the pole 013 and the cover plate 012, and further improving the reliability between the pole 013 and the cover plate 012.

[0225] In addition, the cover plate 012 is formed by stamping a metal plate with a thickness of 1 mm. In the related art, the mounting hole 121 is directly stamped as a constant-diameter hole. At this time, in order to counteract the adverse effect of press-fitting the sealing pin 027, a mounting hole 121 with a higher height needs to be formed, and a mounting hole 121 with a height of 2 mm is usually required to be formed. However, forming a mounting hole 121 with a thickness of 2 mm from a cover plate 012 with a thickness of 1 mm has high process requirements and is difficult to form. In the present embodiment, by the above arrangement, a mounting hole 121 with a height of 1.8 mm can be formed by stamping a metal plate with a thickness of 1 mm, not only a cover plate assembly 001 with better sealing effect can be obtained, but also the forming difficulty can be reduced and the manufacturing efficiency can be improved.

[0226] The diameter difference between the two sections of the two-step hole can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0227] Please refer to FIG. 11. In an embodiment, the cover plate 012 is provided with a liquid injection hole 123, and the side of the cover plate 012 away from the current collector pin 011 is provided with an annular boss 122, which is located between the liquid injection hole 123 and the pole 013.

[0228] It can be understood that the inner diameter of the annular boss 122 is consistent with the diameter of the side of the mounting hole 121 close to the annular boss 122. The sealing insulating member extends between the annular boss 122 and the pole 013.

[0229] Therefore, the pressing of the sealing nail 027 will cause the cover plate 012 to bear a larger impact force, thereby adversely affecting the sealing between the pole post 013 and the cover plate 012.

[0230] Based on this, in the embodiment, by arranging the annular boss 122, the influence of the pressing on the sealing between the pole post 013 and the cover plate 012 can be reduced.

[0231] Referring to FIG. 11, in an embodiment, the cover plate 012 is a stamped part, and the cover plate 012 is arranged with a first annular groove 124 on the side close to the current collecting pin 011, and the first annular groove 124 is arranged opposite to the annular boss 122.

[0232] It can be understood that, since the cover plate 012 is a stamped part, the middle part needs to be punched towards the inside of the battery to form the mounting hole 121 matched with the pole post 013; and in order to form the annular boss 122, the cover plate 012 needs to have more material at the annular boss 122. Directly thickening the metal plate for forming the cover plate 012 not only leads to an increase in material, but also causes many process changes in design.

[0233] Based on this, in the embodiment, the material at the annular groove can be limited from moving downward based on the limiting structure on the die during stamping, so as to form the annular groove on the side of the cover plate 012 close to the battery cell and form the annular boss 122 on the side of the cover plate 012 away from the inside of the battery. In this way, the annular boss 122 which can reduce the adverse influence of the pressing on the sealing can be formed without thickening the metal plate for forming the cover plate 012, so that the related process changes can be controlled, and thus the manufacturing cost of the cover plate 012 can be controlled.

[0234] Referring to FIG. 6, in an embodiment, the cover plate 012 is arranged with a boss 125 on the side close to the current collecting pin 011, and the boss 125 is arranged to extend along the circumference of the mounting hole 121.

[0235] It can be understood that, when the cover plate 012 is a stamped part, the boss 125 is formed by stamping.

[0236] In the embodiment, by the above arrangement, the sealing matching surface between the cover plate 012 and the pole post 013 can be increased, so that the sealing reliability between the cover plate 012 and the pole post 013 can be improved.

[0237] Referring to FIG. 17, FIG. 17 is a structural schematic diagram of a battery provided by an embodiment of the application. Accordingly, an embodiment of the application further provides a battery. The battery comprises the current collecting pin 011 disclosed by some embodiments of the application or the cover plate assembly 001 disclosed by some embodiments of the application.

[0238] It can be understood that the battery further comprises a shell 021, a bottom film 022 arranged inside the shell 021, an edge film 023, a negative electrode 024 arranged between the edge film 023 and the shell 021, a positive electrode 025 arranged inside the edge film 023, and an upper cover film 026 covering the top of the positive electrode. The cover plate 012 is arranged at the opening of the shell 021 and is in sealing connection with the shell 021. The current collecting needle 011 is inserted into the positive electrode. After the liquid injection is completed, the liquid injection hole 123 on the cover plate 012 is plugged by the sealing nail 027.

[0239] The contact portion 1513 is in contact with the positive electrode 025 after passing through the upper cover film 026, as shown in FIG. 18, which is an enlarged view of G in FIG. 17.

[0240] In the embodiment, by collecting the current collecting needle 011 or the cover plate assembly 001 disclosed in some embodiments of the application, the current collecting needle 011 can control the space occupied in the battery and increase the outer surface area of the current collecting needle 011, thereby increasing the contact area of the current collecting needle 011 with the positive electrode and increasing the current collecting area of the current collecting needle 011. Thus, the discharge current of the battery can be increased, thereby expanding the application range of the battery.

[0241] In addition, when the battery is provided with the positioning support 015, there is a gap between the abutting portion 151 and the positive electrode before the battery is injected with liquid. Optionally, the gap is 1-4 mm, for example, the gap can be 2 mm. The gap can provide a buffer space for the expansion of the infiltrated electrolyte, thereby improving the stress state of the positioning support 015, the pole 013 and the cover plate 012, and thereby improving the reliability of the battery.

[0242] Please refer to FIG. 19 or FIG. 20 or FIG. 21, FIG. 19 is a structural schematic diagram of another battery 002 provided by an embodiment of the present application, FIG. 20 is a structural schematic diagram of still another battery 002 provided by an embodiment of the present application, and FIG. 21 is a structural schematic diagram of yet another battery 002 provided by an embodiment of the present application. Accordingly, an embodiment of the present application further provides a battery 002, which comprises a shell 021, a cover plate 012, a pole 013, a core package, and the positioning bracket 015 disclosed by some embodiments of the present application. The shell 021 has a receiving cavity. The cover plate 012 is covered on the shell 021. The pole 013 is arranged on the cover plate 012. The core package is arranged in the receiving cavity. The core package comprises a bottom film 022, a top cover film 026, and a positive electrode 025, a side film 023, and a negative electrode 024 arranged in sequence from the center of the shell 021 outward. The bottom film 022 is arranged on the bottom wall of the receiving cavity. The top cover film 026 is arranged on the end of the positive electrode 025 away from the bottom film 022. The limiting plate 051 is arranged opposite to the positive electrode 025. The abutting member 052 abuts against the pole or the inner wall of the shell 021 along the radial direction of the fitting hole 111a. The first insulating member 053 insulates and separates the abutting member 052 from the component abutting against it. The positioning bracket 015 is arranged spaced apart from the cover plate 012.

[0243] It can be understood that, when assembled, the limiting plate 051 can abut against the positive electrode 025 or can leave a certain gap. The battery 002 of the embodiment is a lithium sub-battery.

[0244] In the embodiment, by adopting the positioning bracket 015 disclosed by some embodiments of the present application, when the positive electrode 025 swells by absorbing the electrolyte injected into the battery 002, the swelled positive electrode 025 can push the positioning bracket 015 to move, so that the position of the positioning bracket 015 can be adaptively adjusted based on the swelling height of the positive electrode 025 after absorbing the electrolyte, and thus the position of the positioning bracket 015 after the battery 002 is fully soaked can be matched with the swelling height of the positive electrode 025. In this way, the positioning bracket 015 can be prevented from being damaged by a large upward force of the positive electrode 025, and the gap between the positive electrode 025 and the positioning bracket 015 can be prevented from causing poor discharge of the battery 002, so that the reliability of the battery 002 can be improved.

Claims

1. A current collecting needle (011) comprising a body (111), an outer circumferential surface of the body (111) being provided with a groove (112).

2. The current collecting needle (011) according to claim 1, wherein The groove (112) is arranged along the circumferential direction of the body (111).

3. The current collecting needle (011) according to claim 2, wherein The groove (112) is an annular groove, an axis of the annular groove being parallel to an axis of the current collecting needle (011).

4. The current collecting needle (011) according to claim 3, wherein There are a plurality of annular grooves, and the plurality of annular grooves are arranged in sequence along the extension direction of the axis of the current collecting needle (011).

5. The current collecting needle (011) according to claim 4, wherein A surface of the body (111) between two adjacent annular grooves is a first arc surface (1121), the first arc surface (1121) is arranged outwardly convex away from the axis of the current collecting needle (011), and two sides of the first arc surface (1121) are smoothly connected with groove walls of the adjacent annular grooves respectively.

6. The current collecting needle (011) according to claim 5, wherein A groove bottom wall of the annular groove is a second arc surface (1122), the second arc surface (1122) is arranged inwardly concave close to the axis of the current collecting needle (011), and two sides of the second arc surface (1122) are smoothly connected with the adjacent first arc surfaces (1121) respectively.

7. The current collecting needle (011) according to claim 6, wherein A maximum outer diameter of the body (111) is D, a radius of the first arc surface (1121) is R1, and 0 < R1 ≤ 0.2D is satisfied;And / or, a radius of the second arc surface (1122) is R2, and 0 < R2 ≤ 0.2D is satisfied.

8. The current collecting needle (011) according to claim 6 or 7, wherein The radius of the first arc surface (1121) is R1, the radius of the second arc surface (1122) is R2, and R2 < R1 is satisfied.

9. The current collecting needle (011) according to any one of claims 6-8, wherein, A cross section is made through a plane in which the axis of the current collecting needle (011) is located, an arc of the first arc surface (1121) is π, an arc of the second arc surface (1122) is π, and the first arc surface (1121) is tangent to the adjacent second arc surface (1122).

10. The current collecting needle (011) according to any one of claims 6-9, wherein, The number of the first arc surfaces (1121) is m, and the number of the second arc surfaces (1122) is n, and m = n + 1 is satisfied, wherein m and n are both natural numbers greater than 0.

11. The current collecting needle (011) according to any one of claims 2-10, wherein, The groove (112) is a spiral groove, a spiral center line of the spiral groove is parallel to the axis of the current collecting needle (011).

12. The current collecting needle (011) according to claim 11, wherein A groove bottom wall of the spiral groove is a third arc surface (1123), the third arc surface (1123) is arranged inwardly concave close to the axis of the current collecting needle (011), and two sides of the third arc surface (1123) are smoothly connected with the outer circumferential surface of the body (111).

13. The current collecting needle (011) according to claim 12, wherein At least part of the outer circumferential surface of the body (111) is a spiral surface, the spiral surface is a fourth arc surface (1124), the fourth arc surface (1124) is arranged outwardly convex away from the axis of the current collecting needle (011), and two sides of the fourth arc surface (1124) are smoothly connected with the adjacent third arc surfaces (1123) respectively.

14. The current collecting needle (011) according to claim 13, wherein The maximum outer diameter of the body (111) is D, a radius of the third arc surface (1123) is R3, and 0 < R3 ≤ 0.2D is satisfied;And / or, a radius of the fourth arc surface (1124) is R4, and 0 < R4 ≤ 0.2D is satisfied.

15. The current collecting needle (011) according to claim 13 or 14, wherein The third arc surface (1123) has a radius R3, and the fourth arc surface (1124) has a radius R4, and R3 < R4.

16. The current collecting needle (011) according to any one of claims 13-15, wherein, A cross section is made through a plane in which the axis of the current collecting needle (011) is located, the third arc surface (1123) has an arc of π, the fourth arc surface (1124) has an arc of π, and the third arc surface (1123) is tangent to the adjacent fourth arc surface (1124).

17. The current collecting needle (011) according to any one of claims 1-16, wherein, The body (111) is a hollow structure (1111).

18. The current collecting needle (011) according to claim 17, wherein The body (111) is an equal-wall-thickness structure.

19. The current collecting needle (011) according to claim 17 or 18, wherein The body (111) is provided with an upper end through hole (1112) and a lower end through hole (1113) at both ends thereof, which are in communication with the inside of the body (111).

20. The current collecting needle (011) according to any one of claims 1-19, wherein, The body (111) has a top end and a bottom end at both ends thereof, the top end is configured to be connected with a pole (013) of a battery (002), and the body (111) has a variable-diameter section (1114) at the bottom end, and the outer diameter of the variable-diameter section (1114) gradually decreases in a direction away from the top end.

21. The current collecting needle (011) according to claim 20, wherein A chamfer (1115) is arranged between the outer peripheral surface of the body (111) and the end surface of the bottom end.

22. The current collecting needle (011) according to any one of claims 1-19, wherein, An electrically conductive layer is arranged on the outer peripheral surface of the body (111) and / or the inner wall of the groove body (112), and the electrically conductive layer is one or more of a nickel plating layer, a gold plating layer, and a carbon coating layer.

23. The current collecting needle (011) according to any one of claims 1-19, wherein, In the axial direction of the current collecting needle (011), the body (111) includes a head portion (113), a middle portion (114), and a tail portion (115) connected in sequence, and the groove body (112) is arranged in the middle portion (114).

24. The current collecting needle (011) according to claim 23, wherein The length of the body (111) is L0, the length of the middle portion (114) is L1, and 0 < L1 ≤ 0.7L0.

25. A cover plate assembly (001) comprising: a cover plate (012) provided with a mounting hole (121); a pole (013) penetrating through the mounting hole (121), the pole (013) being connected with the cover plate (012) through an insulating sealing member (014); and the current collecting needle (011) according to any one of claims 1-24, one end of the body (111) being connected with the pole (013).

26. The cover plate assembly (001) according to claim 25, applied to a lithium sub-battery, further comprising a positioning bracket (015) sleeved on the pole (013) and / or the current collecting needle (011) and in abutting engagement with the pole (013), the positioning bracket (015) having an abutting portion (151) configured to abut against a positive electrode (025) of the lithium sub-battery.

27. The cover plate assembly (001) according to claim 26, wherein The positioning support (015) comprises a sleeve part (152) and the abutting part (151), the sleeve part (152) is sleeved on the pole column (013) and / or the current collecting needle (011) and is in abutting cooperation with the pole column (013), one end of the sleeve part (152) away from the cover plate (012) is connected with the abutting part (151); the abutting part (151) is arranged to extend away from the axis of the current collecting needle (011) by the sleeve part (152).

28. The cover plate assembly (001) according to claim 27, wherein The positioning support (015) is a conductive body, the abutting part (151) comprises a main body (1512) and a contact part (1523) protruding from the surface of the main body (1512) to the positive electrode (025) of the electric core, the contact part (1523) is configured to contact the positive electrode (025) of the lithium sub-battery.

29. The cover plate assembly (001) according to claim 28, wherein The contact part (1523) is arranged between the main body (1512) and the sleeve part (152), and the two ends of the contact part (1523) are connected with the main body (1512) and the sleeve part (152) respectively.

30. The cover plate assembly (001) according to any of claims 27-29, wherein, The positioning support (015) further comprises a positioning ring (153), the positioning ring (153) is located between the abutting part (151) and the cover plate (012), and one end of the positioning ring (153) away from the cover plate (012) is connected with the periphery of the abutting part (151).

31. The cover plate assembly (001) according to any of claims 26-30, wherein, The abutting part (151) is provided with a first through hole (1511) for electrolyte flow.

32. The cover plate assembly (001) according to any of claims 26-30, wherein, The pole column (013) has a shaft shoulder (131), a large diameter section of the pole column (013) is located on the side of the shaft shoulder (131) away from the positioning support (015), and the positioning support (015) is in abutting cooperation with the shaft shoulder (131).

33. The cover plate assembly (001) according to claim 25, applied to a lithium sub-battery, further comprising a positioning support (015), the positioning support (015) comprises: a limiting plate (051) provided with a matching hole (111a), the limiting plate (051) is configured to limit the expansion of the positive electrode (025) of the lithium sub-battery; an abutting piece (052) arranged on the side of the limiting plate (051) away from the positive electrode (025), the abutting piece (052) is configured to abut against the inner wall of the shell (021) of the lithium sub-battery or the pole column (013) along the radial direction of the matching hole (111a); a first insulating piece (053) arranged on the abutting piece (052), the first insulating piece (053) is configured to insulate and isolate the abutting piece (052) from the components abutting against it; wherein the current collecting needle (011) is arranged in the matching hole (111a).

34. The cover plate assembly (001) according to claim 33, wherein The abutting piece (052) is configured to abut the inner wall of the shell (021) along the radial direction of the fitting hole (111a), and the abutting piece (052) is arranged on the periphery of the limiting plate (051), and the first insulating piece (053) is arranged on the side of the abutting piece (052) close to the inner wall of the shell (021).

35. The cover plate assembly (001) according to claim 34, wherein The abutting piece (052) is a cylindrical structure, one end of the abutting piece (052) is connected with the periphery of the limiting plate (051), and the outer wall of the abutting piece (052) is configured to abut the inner wall of the shell (021) along the radial direction of the fitting hole (111a).

36. The cover plate assembly (001) according to claim 35, wherein The first insulating piece (053) extends to one end of the abutting piece (052) away from the limiting plate (051).

37. The cover plate assembly (001) according to claim 36, wherein The first insulating piece (053) is an elastic insulating piece.

38. The cover plate assembly (001) according to claim 37, wherein The first insulating piece (053) is provided with a protrusion (133) at one end away from the limiting plate (051).

39. The cover plate assembly (001) according to claim 38, wherein The protrusion (133) extends in an annular structure along the circumferential direction of the fitting hole (111a), or the protrusion (133) has a plurality of protrusions (133) arranged at intervals along the circumferential direction of the fitting hole (111a).

40. The cover plate assembly (001) according to any one of claims 34-39, wherein, The abutting piece (052) comprises a cylinder (121a) and a ring body (122a), one end of the cylinder (121a) is connected with the periphery of the limiting plate (051), the other end of the cylinder (121a) is provided with a second outward turning edge (123), the outer periphery of the second outward turning edge (123) is connected with one end of the ring body (122a), the ring body (122a) is sleeved on one end of the cylinder (121a) away from the limiting plate (051), the outer wall of the ring body (122a) is configured to abut the inner wall of the shell (021) along the radial direction of the fitting hole (111a), and the outer wall of the ring body (122a) is provided with the first insulating piece (053).

41. The cover plate assembly (001) according to claim 40, wherein, The second outward turning edge (123) is provided with a second through hole (1231), the first insulating piece (053) extends into the second through hole (1231) and is connected with the hole wall of the second through hole (1231).

42. The cover plate assembly (001) according to claim 41, wherein The positioning support (015) further comprises a second insulating piece (054), the second insulating piece (054) is arranged on the side of the second outward turning edge (123) close to the limiting plate (051), and the second insulating piece (054) is connected with the part of the first insulating piece (053) located in the second through hole (1231).

43. The cover plate assembly (001) according to any of claims 40-42, wherein, The ring body (122a) is arranged in the first insulating piece (053).

44. The cover plate assembly (001) according to any one of claims 40-42, wherein, The cylinder (121a) is a conical cylinder, and the small-diameter end of the conical cylinder is arranged close to the limiting plate (051).

45. The cover plate assembly (001) according to any of claims 34-44, wherein, Along the axial direction of the fitting hole (111a), the periphery of the fitting hole (111a) is provided with a second flange (112a), the second flange (112a) is located on the side of the limiting plate (051) close to the abutting piece (052), and the second flange (112a) is sleeved on the current collecting pin (011).

46. The cover plate assembly (001) according to claim 45, wherein An inner circumferential surface of the second flange (112a) is a conical surface, and a large-diameter end of the conical surface is arranged close to the limiting plate (051).

47. The cover plate assembly (001) according to claim 46, wherein, An inner circumferential surface of the second flange (112a) is a conical surface close to one end of the limiting plate (051), and the other end is a cylindrical surface (1121a).

48. The cover plate assembly (001) according to any of claims 34-47, wherein, An outer circumferential surface of the first insulating part (053) is provided with a chamfer close to one end of the limiting plate (051).

49. The cover plate assembly (001) according to any of claims 33-48, wherein, The abutting part (052) is configured to abut against the pole column (013) along the radial direction of the fitting hole (111a), the abutting part (052) is arranged on the circumference of the fitting hole (111a), and the first insulating part (053) is arranged on one side of the abutting part (052) close to the pole column (013).

50. The cover plate assembly (001) according to claim 49, wherein, The abutting part (052) is a cylindrical structure, one end of the abutting part (052) is connected with the circumference of the fitting hole (111a), the abutting part (052) is sleeved on the pole column (013), and the inner wall of the abutting part (052) abuts against the pole column (013) along the radial direction of the fitting hole (111a).

51. The cover plate assembly (001) according to claim 49 or 50, wherein The first insulating part (053) extends to one end of the abutting part (052) away from the limiting plate (051).

52. The cover plate assembly (001) according to claim 51, wherein, The first insulating part (053) is an elastic insulating part.

53. The cover plate assembly (001) according to claim 52, wherein, One end of the first insulating part (053) away from the limiting plate (051) is provided with a sunken platform (132).

54. The cover plate assembly (001) according to claim 53, wherein, The sunken platform (132) is arranged around the axis of the fitting hole (111a), and the platform surface of the sunken platform (132) extends to the fitting hole (111a).

55. The cover plate assembly (001) according to any of claims 52-53, wherein, An outer circumferential surface of the first insulating part (053) is a conical surface, and a small-diameter end of the conical surface is arranged close to the limiting plate (051).

56. The cover plate assembly (001) according to any of claims 49-55, wherein, One end of the abutting part (052) away from the limiting plate (051) is provided with a first outward flange (124), and the first outward flange (124) is arranged inside the first insulating part (053).

57. The cover plate assembly (001) according to any of claims 49-56, wherein, Along the axial direction of the fitting hole (111a), an outer circumference of the limiting plate (051) is provided with a first flange (113a), and the first flange (113a) is located on one side of the limiting plate (051) close to the abutting part (052).

58. The cover plate assembly (001) according to any of claims 33-57, wherein, The limiting plate (051) is provided with a plurality of third through holes (114a).

59. The cover plate assembly (001) according to any of claims 33-37, wherein, The limiting plate (051) is configured to have a spacing of not more than 1.5 mm with the positive electrode (025), and / or the abutting part (052) is configured to have a spacing of not less than 2.5 mm with the cover plate (012).

60. The cover plate assembly (001) according to any of claims 25-59, wherein, The pole column (013) is inserted into the body (111).

61. The cover plate assembly (001) according to claim 60, wherein, The pole column (013) has a shaft shoulder (131), a small-diameter section of the pole column (013) is located on one side of the shaft shoulder (131) close to the body (111), the small-diameter section is inserted into the body (111), and an end of the body (111) abuts against the shaft shoulder (131).

62. The cover plate assembly (001) according to any of claims 25-61, wherein, The mounting hole (121) is a two-step hole, a small-diameter section of which is close to the body (111), and the insulating seal (014) is arranged between the hole wall of the mounting hole (121) and the pole (013), and is in sealing connection with the outer circumferential surface of the pole (013) and the hole wall of the mounting hole (121) respectively.

63. The cover plate assembly (001) according to any of claims 25-62, wherein, The cover plate (012) is provided with a liquid injection hole (123), and the side, away from the current collecting needle (011), of the cover plate (012) is provided with an annular boss (125) (122) between the liquid injection hole (123) and the pole (013).

64. The cover plate assembly (001) according to claim 63, wherein, The cover plate (012) is a stamping part, and the side, close to the current collecting needle (011), of the cover plate (012) is provided with a first annular groove (124) arranged opposite to the annular boss (125) (122).

65. The cover plate assembly (001) according to any of claims 25-64, wherein, The side, close to the current collecting needle (011), of the cover plate (012) is provided with a boss (125) extending along the circumference of the mounting hole (121).

66. A battery (002) comprising the current collecting needle (011) according to any one of claims 1-24, or the cover plate assembly (001) according to any one of claims 25-65.

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