Current collection pins, cover assembly, and battery

Abstract

To provide a collecting pin having a novel structure.SOLUTION: The present application provides a collecting pin, a cover assembly, and a battery. The battery includes the cover assembly. The cover assembly includes: a cover provided with a mounting hole; a terminal post inserted through the mounting hole and connected to the cover via an insulating sealing member; and a collecting pin. The collecting pin includes a main body, and a groove structure is provided on the outer circumferential surface of the main body. One end of the main body is connected to the terminal post.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to current collectors, cover assemblies, and batteries.

[0002] This application claims priority based on the international application with application number PCT / CN2024 / 121452 and the Chinese applications with application numbers 202410460455.5, 202420793926.X, and 202420793895.8 respectively, and incorporates all the descriptions set forth in those applications.

Background Art

[0003] In related technologies, a lithium thionyl chloride battery is a type of battery that uses lithium metal or a lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. A lithium thionyl chloride battery includes a housing, a positive electrode, a negative electrode, an edge film, a bottom film, an upper cover film provided inside the housing, and a cover assembly for closing the housing. The cover assembly includes a cover, a pole column insulated from the cover by a glass seal, and a current collector connecting the pole column to the positive electrode.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Due to the relatively small size of the current collector, its current collection area is small, resulting in a small discharge current of the lithium thionyl chloride battery using the current collector, and thus the application range of the lithium thionyl chloride battery is limited. On the other hand, if the size of the current collector is increased to enlarge its current collection area, the space occupied by the current collector inside the battery will increase, which will have an adverse effect on the energy density of the lithium thionyl chloride battery.

Means for Solving the Problems

[0005] This invention provides a current collector pin, a cover assembly, and a battery, which can improve the problem of the current collector pin having a relatively small current collection area.

[0006] In a first embodiment, the present invention provides a current collector pin, which includes a body, the outer surface of which is provided with grooves.

[0007] In a second aspect, the present invention provides a cover assembly comprising a cover, poles, and the current-collecting pins described above. The cover is provided with mounting holes, and the poles are inserted through the mounting holes and connected to the cover via insulating sealing members. One end of the main body is connected to the poles.

[0008] In a third aspect, the present application provides a battery, which includes the cover assembly described above. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the structure of the current collector pin provided in the embodiment of the present application. [Figure 2] This is an enlarged view relating to portion A of Figure 1 provided in the embodiment of the present application. [Figure 3] This is a schematic diagram showing the structure of another current collector pin provided in the embodiment of the present application. [Figure 4] This is an enlarged view relating to portion B of Figure 3 provided in the embodiment of the present application. [Figure 5] This is an enlarged view relating to portion C of Figure 1 provided in the embodiment of the present application. [Figure 6] This is a schematic diagram showing the structure of the cover assembly provided in the embodiment of the present application. [Figure 7] This is a schematic diagram illustrating the structure of another cover assembly provided in the embodiments of the present application. [Figure 8] This is an enlarged view relating to portion D of Figure 7 provided in the embodiment of the present application. [Figure 9] This is a schematic diagram illustrating the structure of another cover assembly provided in the embodiments of the present application. [Figure 10]This is an enlarged view of section F in Figure 9. [Figure 11] This is an enlarged view relating to portion E of Figure 6 provided in the embodiment of the present application. [Figure 12] This is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiments of the present application. [Figure 13] This is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiments of the present application. [Figure 14] This is an enlarged view of section H in Figure 12. [Figure 15] This is an enlarged view of part I in Figure 12. [Figure 16] This is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiments of the present application. [Figure 17] This is a schematic diagram showing the structure of the battery provided in the embodiment of the present application. [Figure 18] This is an enlarged view of section G in Figure 17. [Figure 19] This is a schematic diagram showing the structure of another battery provided in the embodiments of the present invention. [Figure 20] This is a schematic diagram showing the structure of another battery provided in the embodiments of the present invention. [Figure 21] This is a schematic diagram showing the structure of another battery provided in the embodiments of the present invention. [Modes for carrying out the invention]

[0010] Referring to Figure 1, Figure 1 is a schematic diagram showing the structure of a current collector pin 011 provided in an embodiment of the present application. The embodiment of the present application provides a current collector pin 011 which includes a body 111. A groove 112 is provided on the outer circumferential surface of the body 111.

[0011] To ensure clarity, the structural shape of the groove body 112 is not particularly limited. The groove body 112 is a groove, and may consist of multiple grooves distributed along the circumferential and axial directions of the current collection pin 011. The groove body 112 may also be an annular groove, a helical groove, or the like.

[0012] Furthermore, when the current collector pin 011 is used in a thionyl chloride lithium battery, the current collector pin 011 is inserted into the positive electrode, and both the outer peripheral surface of the main body 111 and the inner wall of the groove body 112 are in contact with the positive electrode.

[0013] In this embodiment, by providing the groove body 112 on the outer peripheral surface of the main body 111, the space occupied by the current collector pin 011 inside the battery can be controlled, and the surface area of the outer surface of the current collector pin 011 can be increased. Thereby, the contact area between the current collector pin 011 and the positive electrode can be increased, and thus the current collection area of the current collector pin 011 can be increased. Therefore, the discharge current of the thionyl chloride lithium battery using this current collector pin 011 can be made relatively large, and thus the application range of the thionyl chloride lithium battery can be expanded.

[0014] Also, on the premise of the same outer diameter as other current collector pins 011, the current collector pin 011 provided in this embodiment enables the positive electrode to be filled into the groove body 112 by providing the groove body 112 on the outer peripheral surface of the main body 111. Thereby, the space occupied by the current collector pin 011 inside the battery can be reduced, and thus the energy density of the thionyl chloride lithium battery can be increased.

[0015] In one embodiment, the groove body 112 is provided to extend along the circumferential direction of the main body 111. As can be understood, the groove body 112 may be an annular groove or a spiral groove extending along the circumferential direction of the main body 111, or may have a structure such as a plurality of grooves provided at intervals along the circumferential direction of the main body 111.

[0016] Here, when the groove body 112 is an annular groove extending along the circumferential direction of the main body 111, referring to FIG. 2, FIG. 2 is an enlarged view related to part A of FIG. 1 provided in the embodiment of the present application. Specifically, the groove body 112 is an annular groove, and the axis of the annular groove is parallel to the axis of the current collector pin 011.

[0017] Optionally, the axis of the annular groove is arranged on the same straight line as the axis of the current collector pin 011.

[0018] In this embodiment, by arranging the current collector pin 011 in the manner described above, the stress state of the current collector pin 011 can be improved, and consequently, the reliability of the current collector pin 011 can be increased.

[0019] Referring to Figure 1, in one embodiment, there are multiple annular grooves, which are arranged sequentially along the extending direction of the axis of the current collection pin 011.

[0020] Specifically, the multiple annular grooves are arranged sequentially at equal intervals along the axis of the current collection pin 011.

[0021] In this embodiment, by providing multiple annular grooves, the surface area of ​​the current collector pin 011 is increased, thereby forming an embedded structure between the positive electrode and the current collector pin 011, resulting in a larger contact area between the current collector pin 011 and the positive electrode, and consequently increasing the current collection surface of the current collector pin 011 and improving the current collection effect of the current collector pin 011. On the other hand, the overall integrity of the current collector pin 011 and the positive electrode is improved, increasing the reliability of the cooperation between the current collector pin 011 and the positive electrode.

[0022] Referring to Figure 1 or Figure 2, in one embodiment, the surface located between two adjacent annular grooves of the main body 111 is the first arcuate surface 1121, which is convex away from the axis of the current collection pin 011, and both sides of the first arcuate surface 1121 are smoothly connected to the groove walls of the adjacent annular grooves, respectively.

[0023] In this embodiment, the above-described arrangement makes the stress between the two annular grooves of the current collector pin 011 more uniform, reducing the possibility of localized stress concentration and thereby improving the structural stability and durability of the current collector pin 011.

[0024] Referring to Figure 1 or Figure 2, in one embodiment, the bottom wall of the annular groove is a second arcuate surface 1122, which is recessed at a position close to the axis of the current collection pin 011, and both sides of the second arcuate surface 1122 are smoothly connected to the adjacent first arcuate surface 1121.

[0025] In this embodiment, the above-described arrangement allows the positive electrode to be well filled by the groove body 112, avoiding the existence of unfilled areas. On the other hand, the stress in the annular groove of the current collector pin 011 can be made more uniform, reducing the possibility of localized stress concentration and thereby improving the structural stability and durability of the current collector pin 011.

[0026] Furthermore, if the groove 112 extends along the circumferential direction of the main body 111 and is a helical groove, refer to Figure 3, which is a schematic diagram showing the structure of another current collector pin 011 provided in an embodiment of the present application. The groove 112 is a helical groove, and the helical centerline of the helical groove is parallel to the axis of the current collector pin 011.

[0027] As an option, the spiral centerline of the spiral groove is aligned with the axis of the current collection pin 011.

[0028] In this embodiment, by providing the groove body 112 as a helical groove, an embedded structure is formed between the positive electrode and the current collector pin 011, thereby increasing the contact area between the current collector pin 011 and the positive electrode, and consequently increasing the current collection surface of the current collector pin 011, thereby improving the current collection effect of the current collector pin 011.

[0029] Furthermore, by providing the groove body 112 as a helical groove, the current collector pin 011 can be screwed into the positive electrode, reducing obstruction to the attachment of the current collector pin 011 from the positive electrode. Thus, the efficiency of attaching the current collector pin 011 to the positive electrode can be increased, while the overall integrity of the current collector pin 011 and the positive electrode can be improved, and consequently, the reliability of the cooperation between the current collector pin 011 and the positive electrode can be increased.

[0030] Referring to Figure 4, which is an enlarged view relating to portion B of Figure 3 provided in an embodiment of the present application. In one embodiment, the bottom wall of the helical groove is a third arcuate surface 1123, which is recessed at a position close to the axis of the current collection pin 011, and both sides of the third arcuate surface 1123 are smoothly connected to the outer circumferential surface of the main body 111.

[0031] In this embodiment, with the above-described arrangement, the cathode can be well filled by the groove body 112, and the existence of unfilled regions can be avoided. On the other hand, the stress in the groove body 112 of the current collector pin 011 can be made more uniform, reducing the possibility of local stress concentration, and thus improving the structural stability and durability of the current collector pin 011.

[0032] Referring to FIG. 2, in one embodiment, the maximum outer diameter of the main body 111 is D, the radius of the first arc surface 1121 is R1, and 0 < R1 ≤ 0.2D is satisfied. And / or, the radius of the second arc surface 1122 is R2, and 0 < R2 ≤ 0.2D is satisfied.

[0033] Specifically, the radius of the first arc surface 1121 is R1, and 0 < R1 ≤ 0.2D is satisfied. Or, the radius of the second arc surface 1122 is R2, and 0 < R2 ≤ 0.2D is satisfied. Or, the radius of the first arc surface 1121 is R1, and 0 < R1 ≤ 0.2D is satisfied, and the radius of the second arc surface 1122 is R2, and 0 < R2 ≤ 0.2D is satisfied.

[0034] Here, R1 and R2 may be 0.01D, 0.02D, 0.05D, 0.06D, 0.08D, 0.1D, 0.12D, 0.15D, 0.16D, 0.18D, 0.19D, 0.2D, but are not limited thereto.

[0035] Illustratively, it is as follows.

[0036] When D is 1 mm, R1 and R2 may be 0.01 mm, 0.03 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, but are not limited thereto.

[0037] When D is 1.5 mm, R1 and R2 may be 0.01 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.13 mm, 0.14 mm, 0.17 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.28 mm, 0.3 mm, but are not limited thereto.

[0038] When D is 2 mm, R1 and R2 may be 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, but are not limited thereto.

[0039] When D is 2.5 mm, R1 and R2 may be 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, but are not limited thereto.

[0040] Specifically, 0.1D ≤ R1 ≤ 0.2D and 0.1D ≤ R2 ≤ 0.2D are set.

[0041] In this embodiment, by limiting the radius of the first arc surface 1121 to R1, it is possible to avoid the situation where this radius is too large and the maximum outer diameter of the current collector pin 011 becomes relatively large, thereby controlling the maximum outer diameter of the current collector pin 011, and thus avoiding the current collector pin 011 occupying a relatively large space inside the battery. By limiting the radius of the second arc surface 1122 to R2, it is possible to avoid the situation where this radius is too large and the minimum outer diameter of the current collector pin 011 becomes too small, thereby controlling the resistance when the current collector pin 011 is inserted into the positive electrode, and thus improving the convenience of attaching the current collector pin 011.

[0042] In one embodiment, 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.

[0043] Specifically, 0 < R2 < R1 ≤ 0.2D is set.

[0044] In this embodiment, the above-mentioned limitations allow for a relatively large radius of the first arcuate surface 1121 while controlling the width of the cross-section of the current collector pin 011. This increases the strength of the first arcuate surface 1121, thereby improving its resistance to external pressure and impact forces, and reducing damage to the current collector pin 011 due to collisions during transportation, storage, assembly, and other processes.

[0045] Here, the width of the cross-section of the current collector pin 011 is the distance between the side of the second arc surface 1122 that is closer to the axis of the current collector pin 011 and the side of the first arc surface 1121 that is further away from the axis of the current collector pin 011, along the radial direction of the current collector pin 011. By controlling this width, the resistance force with which the current collector pin 011 is inserted into the positive electrode can be controlled, thereby increasing assembly efficiency.

[0046] Referring to Figure 2, in one embodiment, the cross-section is a plane on which the axis of the current collection pin 011 lies, the radii of the first circular arc surface 1121 is π, the radii of the second circular arc surface 1122 is π, and the first circular arc surface 1121 is tangent to the adjacent second circular arc surface 1122.

[0047] To make it clear, the contact area between the first arcuate surface 1121 and the second arcuate surface 1122 is a circle provided around the axis of the current collection pin 011. The contact areas on both sides of the first arcuate surface 1121 are provided spaced apart along the axis of the current collection pin 011.

[0048] In this embodiment, the above-described arrangement simplifies the surface structure of the current collector pin 011 and controls the number of smoothly connected curved surfaces between the first arcuate surface 1121 and the second arcuate surface 1122, thereby reducing the manufacturing complexity of the current collector pin 011. On the other hand, by making the first arcuate surface 1121 tangent to the second arcuate surface 1122, a relatively large number of transition structures on the surface of the current collector pin 011 can be avoided, reducing stress concentration and, consequently, improving the stress state of the current collector pin 011.

[0049] In one embodiment, the number of first arc surfaces 1121 is m, the number of second arc surfaces 1122 is n, and m = n + 1 is satisfied, where both m and n are natural numbers greater than 0.

[0050] To make it clear, the second arcuate surface 1122 is located between two adjacent first arcuate surfaces 1121. Accordingly, as shown in Figure 1, one first arcuate surface 1121 closer to the head portion 113 is connected to the outer circumferential surface of the head portion 113, and one first arcuate surface 1121 closer to the tail portion 115 is connected to the outer circumferential surface of the tail portion 115.

[0051] In this embodiment, the above-described arrangement allows the current collection pins 011 to have a relatively large number of current collection pins on the first arcuate surface 1121, thereby increasing the structural strength of the current collection pins 011. Furthermore, by connecting the first arcuate surface 1121 to the outer circumferential surface of the head portion 113 and the first arcuate surface 1121 to the outer circumferential surface of the tail portion 115, the connection strength between the middle portion 114 and the head portion 113, and between the middle portion 114 and the tail portion 115 can be increased.

[0052] Referring to Figure 4, in one embodiment, at least a portion of the outer circumferential surface of the main body 111 is a helical surface, the helical surface is the fourth circular arc surface 1124, the fourth circular arc surface 1124 is convex away from the axis of the current collection pin 011, and both sides of the fourth circular arc surface 1124 are smoothly connected to the adjacent third circular arc surface 1123.

[0053] To make it easier to understand, a portion of the outer surface of the main body 111 may be a helical surface, or the entire outer surface of the main body 111 may be a helical surface. Specifically, a portion of the outer surface of the main body 111 is used to form a helical groove, and another portion forms a helical surface based on the formed helical groove.

[0054] In this embodiment, the above-described arrangement makes the stress between adjacent tank walls of the current collector pin 011 more uniform, reduces the possibility of localized stress concentration, and consequently improves the structural stability and durability of the current collector pin 011.

[0055] Referring to FIG. 4, in one embodiment, the maximum outer diameter of the main 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.

[0056] 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.

[0057] Here, R3 and R4 may be 0.01D, 0.02D, 0.05D, 0.06D, 0.08D, 0.1D, 0.12D, 0.15D, 0.16D, 0.18D, 0.19D, 0.2D, but are not limited thereto.

[0058] Illustratively, it is as follows.

[0059] When D is 1 mm, R3 and R4 may be 0.01 mm, 0.03 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, but are not limited thereto.

[0060] When D is 1.5 mm, R3 and R4 may be 0.01 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.13 mm, 0.14 mm, 0.17 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.28 mm, 0.3 mm, but are not limited thereto.

[0061] When D is 2 mm, R3 and R4 may be 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, but are not limited thereto.

[0062] When D is 2.5 mm, R3 and R4 may be 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, but are not limited thereto.

[0063] Specifically, 0.1D ≤ R3 ≤ 0.2D, 0.1D ≤ R4 ≤ 0.2D.

[0064] In this embodiment, by limiting the radius of the fourth arc surface 1124 to R4, it is possible to avoid the situation where this radius is too large and the maximum outer diameter of the current collecting pin 011 becomes relatively large, control the maximum outer diameter of the current collecting pin 011, and thus avoid the current collecting pin 011 occupying a relatively large space inside the battery. By limiting the radius of the third arc surface 1123 to R3, it is possible to avoid the situation where this radius is too large and the minimum outer diameter of the current collecting pin 011 becomes too small, control the resistance when the current collecting pin 011 is inserted into the positive electrode, and thus improve the convenience of mounting the current collecting pin 011.

[0065] In one embodiment, the radius of the third arc surface 1123 is R3, the radius of the fourth arc surface 1124 is R4, and R3 < R4 is satisfied.

[0066] Specifically, 0 < R3 < R4 ≤ 0.2D is set.

[0067] In this embodiment, due to the above-mentioned limitations, while controlling the width of the cross-section of the current collecting pin 011, the radius of the fourth arc surface 1124 can be made relatively large, thereby increasing the strength of the fourth arc surface 1124, and thus improving the resistance of the fourth arc surface 1124 to external pressure and impact force, and reducing the damage caused by collision of the current collecting pin 011 during processes such as transportation, storage, and assembly.

[0068] Here, the width of the cross-section of the current collector pin 011 is the distance between the side of the third arc surface 1123 that is closer to the axis of the current collector pin 011 and the side of the fourth arc surface 1124 that is further away from the axis of the current collector pin 011, along the radial direction of the current collector pin 011. By controlling this width, the resistance force with which the current collector pin 011 is inserted into the positive electrode can be controlled, thereby increasing assembly efficiency.

[0069] Referring to Figure 4, in one embodiment, when a cross-section is made of a plane along the axis of the current collection pin 011, the radii of the third circular arc surface 1123 is π, the radii of the fourth circular arc surface 1124 is π, and the third circular arc surface 1123 is tangent to the adjacent fourth circular arc surface 1124.

[0070] In this embodiment, the above-described arrangement simplifies the surface structure of the current collector pin 011 and controls the number of smoothly connected curved surfaces between the third arcuate surface 1123 and the fourth arcuate surface 1124, thereby reducing the manufacturing complexity of the current collector pin 011. On the other hand, by bringing the third arcuate surface 1123 into contact with the fourth arcuate surface 1124, a relatively large number of transition structures on the surface of the current collector pin 011 can be avoided, reducing stress concentration and, consequently, improving the stress state of the current collector pin 011.

[0071] Referring to Figure 1 or Figure 3, in one embodiment, the main body 111 is a hollow structure 1111.

[0072] Specifically, the main body 111 has a structure with uniform wall thickness and is a thin-walled structure.

[0073] In this embodiment, by providing a hollow structure 1111 in the main body 111, the thickness of the main body 111 is reduced, thereby allowing the main body 111 to have relatively high elasticity. In particular, if the main body 111 has a thin-walled structure, the elasticity of the main body 111 can be increased. Therefore, it is possible to increase the contact pressure between the current collector pin 011 and the positive electrode, improve the reliability of the contact between the current collector pin 011 and the positive electrode, and contribute to improving the current collection effect of the current collector pin 011.

[0074] Furthermore, by providing the main body 111 with a structure having a uniform wall thickness, the stress on the current collector pin 011 can be made more uniform, reducing the possibility of localized stress concentration, and consequently increasing the pressure resistance of the current collector pin 011, thereby improving the structural stability and durability of the current collector pin 011.

[0075] Referring to Figures 1 and 5, Figure 5 is an enlarged view of portion C of Figure 1 provided in an embodiment of the present application. In one embodiment, the main body 111 is provided with an upper end through hole 1112 and a lower end through hole 1113 at both ends, which communicate with the inside of the main body 111.

[0076] In this embodiment, with the above-described arrangement, when the battery assembly is completed and the electrolyte is injected, a portion of the electrolyte flows from the upper through-hole 1112 into the hollow structure 1111 and is discharged from the lower through-hole 1113 to the positive electrode, thereby increasing the impregnation efficiency of the battery.

[0077] Referring to Figure 5, in one embodiment, the main body 111 has a tip and a terminal at both ends, with the tip being connected to the electrode post 013 of the battery. The main body 111 has a variable diameter portion 1114 located at the terminal end, and the outer diameter of the variable diameter portion 1114 gradually decreases along the direction away from the tip.

[0078] To make it easier to understand, when assembling the battery, the negative electrode, bottom film, edge film, positive electrode, and top film are placed in the housing 1, and then the current collector pin 011 is inserted into the positive electrode. In this embodiment, by providing a diameter-changing portion 1114 at the end away from the tip of the current collector pin 011, the resistance force required for the current collector pin 011 to be inserted into the positive electrode is reduced, improving the stress state of the current collector pin 011 and increasing assembly efficiency.

[0079] Furthermore, the lower end through-hole 1113 is provided on the end face of the end section.

[0080] Referring to Figure 5, in one embodiment, a chamfer 1115 is provided between the outer circumferential surface and the end face of the main body 111.

[0081] For example, chamfer 1115 is a round chamfer 1115.

[0082] In this embodiment, the above-described arrangement can reduce the resistance force required for the current collector pin 011 to be inserted into the positive electrode. On the other hand, the stress state at the end of the current collector pin 011 can be improved, thereby enhancing the structural stability and durability of the current collector pin 011.

[0083] In one embodiment, a conductive layer is provided on the outer surface of the main body 111 and / or on the inner wall of the groove 112, and the conductive layer is one or more of the following: a nickel plating layer, a gold plating layer, and a carbon coating layer.

[0084] To make it easier to understand, a conductive layer is provided on the outer surface of the main body 111, or on the inner wall of the groove 112, or a conductive layer is provided on both the outer surface of the main body 111 and the inner wall of the groove 112.

[0085] In this embodiment, the above-described arrangement makes it possible to improve the conductivity of the current collection pin 011 and enhance the current collection effect of the current collection pin 011.

[0086] Referring to Figure 1 or Figure 3, in one embodiment, along the axial direction of the current collection pin 011, the main body 111 includes a head portion 113, a middle portion 114, and a tail portion 115 connected in order, and the grooved body 112 is provided in the middle portion 114.

[0087] Here, the maximum outer diameter of the middle section 114 is larger than the maximum outer diameter of the head section 113 and larger than the maximum outer diameter of the tail section 115.

[0088] To make it easier to understand, the head portion 113 is used to connect the battery's polarity poles, and the tail portion 115 is directed towards the bottom of the battery and is used as a guide to insert the positive terminal into the battery pin 011.

[0089] In this embodiment, by the above-described arrangement, it is possible to avoid the groove body 112 being provided on the head portion 113 and the tail portion 115. In this way, by flattening the outer surface of the head portion 113, it is easy to hold the head portion 113 and weld the head portion 113 to the terminal post. On the other hand, the resistance of the tail portion 115 can be reduced, and the resistance when the tail portion 115 is inserted into the positive electrode can be reduced.

[0090] Referring to FIG. 1 or FIG. 3, in one embodiment, the length of the main body 111 is L0, the length of the middle portion 114 is L1, and 0 < L1 ≤ 0.7L0 is satisfied.

[0091] As can be understood, L1 may be 0.1L0, 0.2L0, 0.25L0, 0.3L0, 0.4L0, 0.5L0, 0.6L0, 0.65L0, 0.66L0, 0.7L0, but is not limited thereto.

[0092] For example, when L0 is 20 mm, L1 may be 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, 14 mm, but is not limited thereto.

[0093] In this embodiment, by the above-described limitation, it is possible to avoid the length of the groove body 112 being too long and affecting the arrangement of the head portion 113 and the tail portion 115, improve the reliability of the connection between the head portion 113 and the terminal post, and improve the smoothness of the insertion of the current collecting pin 011 into the positive electrode.

[0094] Referring to FIG. 6, FIG. 6 is a schematic diagram showing the structure of the cover assembly 001 provided in the embodiment of the present application. The embodiment of the present application provides a cover assembly 001. This cover assembly 001 includes a cover 012, a terminal post 013, and a current collecting pin 011 disclosed in some embodiments of the present application. A mounting hole 121 is provided in the cover 012. The terminal post 013 penetrates through the mounting hole 121 and is connected to the cover 012 through an insulating sealing member 014. One end of the main body 111 is connected to the terminal post 013.

[0095] As an example, the insulating sealing member 014 is a glass insulator, and the glass insulator forms a glass seal between the pole post 013 and the mounting hole 121, sealing the pole post 013 and the mounting hole 121.

[0096] Furthermore, the pole pole 013 may be directly welded to the current collection pin 011, or both the pole pole 013 and the current collection pin 011 may be first inserted and then welded together.

[0097] In this embodiment, by using the current collector pin 011 disclosed in some embodiments of the present application, the space occupied by the current collector pin 011 inside the battery can be controlled, and the surface area of ​​the outer surface of the current collector pin 011 can be increased. This increases the contact area between the current collector pin 011 and the positive electrode, and consequently increases the current collection area of ​​the current collector pin 011. Therefore, the discharge current of the lithium thionyl chloride battery using this cover assembly 001 can be made relatively large, and consequently the range of applications for the lithium thionyl chloride battery can be expanded.

[0098] Referring to Figure 7, Figure 7 is a schematic diagram showing the structure of another cover assembly 001 provided in embodiments of the present application. In one embodiment, the cover assembly 001 is applied to a lithium thionyl chloride battery, and the cover assembly 001 further includes a positioning bracket 015. The positioning bracket 015 is fitted onto and secured to the pole post 013 and / or current collector pin 011. The positioning bracket 015 has a contact portion 151, which is configured to contact the positive electrode of the lithium thionyl chloride battery.

[0099] Here, the positioning bracket 015 is fitted onto the pole pole 013 or the current collection pin 011, or part of the positioning bracket 015 is fitted onto the pole pole 013 and the other part is fitted onto the current collection pin 011.

[0100] To understand this, the positive electrode expands when impregnated with the electrolyte, and also expands during the discharge process. If the height of the expanded positive electrode exceeds the height of the negative electrode 024, the current collection effect decreases, leading to a discharge failure, while a current flow occurs from the positive electrode to the negative electrode 024, causing a short circuit in the battery.

[0101] As described above, in this embodiment, by providing the positioning bracket 015, if the positive electrode is expanding, the positional restriction on the expansion of the positive electrode can be applied to ensure the current collection effect, and consequently, the agreement between the designed battery discharge capacity and the actual discharge capacity can be improved.

[0102] Referring to Figure 8, which is an enlarged view relating to portion D of Figure 7 provided in an embodiment of the present application. In one embodiment, the positioning bracket 015 includes a sleeve connector 152 and a contact portion 151, the sleeve connector 152 being fitted onto and secured to the pole pole 013, and the end of the sleeve connector 152 away from the cover 012 being connected to the contact portion 151. The contact portion 151 is provided extending from the sleeve connector 152 in a direction away from the axis of the current collector pin 011.

[0103] Referring to Figures 9 and 10, Figure 9 is a schematic diagram showing the structure of another cover assembly 001 provided in an embodiment of the present application, and Figure 10 is an enlarged view relating to portion F of Figure 9. In one embodiment, the positioning bracket 015 is a conductor, and the contact portion 151 includes a main body 1512 and a contact portion 1513 that protrudes from the surface of the main body 1512 toward the positive electrode of the battery cell, the contact portion 1513 being configured to contact the positive electrode of a lithium thionyl chloride battery.

[0104] To make it clear, the contact portion 1513 may be located at any position on the main body 1512, for example, at the end of the main body 1512 closer to the sleeve connection portion 152, or at the end of the main body 1512 further away from the sleeve connection portion 152.

[0105] Here, an upper cover film is provided at the upper end of the positive electrode. Accordingly, a hole or opening is provided in the portion of the upper cover film facing the contact portion 1513 so that the contact portion 1513 passes through the upper cover film and contacts the positive electrode.

[0106] In this embodiment, the above-described arrangement causes the positioning bracket 015 to function as a current collector between the positive electrode and the pole post 013, thereby increasing the current collection surface between the pole post 013 and the positive electrode, and ultimately improving the current collection effect.

[0107] Referring to Figures 9 and 10, in one embodiment, the contact portion 1513 is provided between the main body 1512 and the sleeve connection portion 152, and both ends of the contact portion 1513 are connected to the main body 1512 and the sleeve connection portion 152, respectively.

[0108] In this embodiment, the arrangement described above allows the contact portion 1513 to be provided adjacent to the pole pole 013, thereby shortening the diameter of the current collection path of the contact portion 1513 and improving the current collection effect.

[0109] Referring to Figure 8, in one embodiment, the positioning bracket 015 further includes a positioning ring 153, which is located between the contact portion 151 and the cover 012, with the end of the positioning ring 153 away from the cover 012 connected to the periphery of the contact portion 151.

[0110] To make it clear, the lithium thionyl chloride battery consists of, in order from the current collection pin 011 outward, the positive electrode, edge film 023, negative electrode 024, and housing 021. To increase the positional constraint of the positioning bracket 015 relative to the positive electrode, the outer diameter of the contact portion 151 matches the outer diameter of the positive electrode. The outer circumference of the contact portion 151 faces the edge film 023. If the outer circumference of the contact portion 151 were positioned directly opposite the edge film 023, the corners of the outer circumference of the contact portion 151 could damage the edge film 023.

[0111] As described above, in this embodiment, by providing the positioning ring 153, direct contact between the outer corner of the contact portion 151 and the edge film 023 can be avoided, thereby preventing the edge film 023 from being damaged by the contact portion 151 and ultimately improving the reliability of the battery.

[0112] Referring to Figure 8, which is an enlarged view of portion D of Figure 7 provided in an embodiment of the present application. In one embodiment, a first through-hole 1511 is provided in the contact portion 151, and the first through-hole 1511 is used for the flow of electrolyte.

[0113] As an example, there are multiple first through-holes 1511, and these multiple first through-holes 1511 are distributed along the circumferential and radial directions of the contact portion 151.

[0114] In this embodiment, with the above-described arrangement, when the battery assembly is completed and the electrolyte is injected, the electrolyte can flow into the positive electrode from the first through-hole 1511, contributing to the impregnation of the battery.

[0115] Referring to Figure 8, in one embodiment, the pole column 013 has a shaft shoulder 131, the large diameter portion of the pole column 013 is located on the side of the shaft shoulder 131 away from the positioning bracket 015, and the positioning bracket 015 is in contact with the shaft shoulder 131.

[0116] In this embodiment, by providing the shaft shoulder 131, the positioning bracket 015 is brought into contact with the shaft shoulder 131, thereby achieving stopping cooperation between the positioning bracket 015 and the pole column 013, and ultimately improving the positional stability of the positioning bracket 015 so that the positioning bracket 015 is stable in a position that limits the position against expansion of the positive pole.

[0117] In addition to the structure of the positioning bracket 015 provided in the embodiments of the present application described above, embodiments of the present application further provide other structures of the positioning bracket 015 by the following embodiments. Referring to Figure 12 or Figure 13, Figure 12 is a schematic diagram showing the structure of another positioning bracket 015 in the cover assembly 001 provided in embodiments of the present application, and Figure 13 is a schematic diagram showing the structure of another positioning bracket 015 in the cover assembly 001 provided in embodiments of the present application. In embodiments of the present application, the cover assembly 001 is applied to a lithium thionyl chloride battery. The positioning bracket 015 in this embodiment includes a position limiting plate 051, a contact member 052, and a first insulating member 053. The position limiting plate 051 is provided with an alignment hole 111a, and the position limiting plate 051 is configured to limit the position of the positive electrode of the lithium thionyl chloride battery against expansion. The contact member 052 is provided on the side of the position limiting plate 051 away from the positive electrode, and is configured to contact the inner wall of the lithium thionyl chloride battery housing or the electrode column of the lithium thionyl chloride battery along the radial direction of the alignment hole 111a. The first insulating member 053 is provided on the contact member 052, and is configured to insulate and isolate the contact member 052 from the component it is in contact with. The current collector pin 011 is inserted through the alignment hole 111a.

[0118] To make it easier to understand, as shown in Figure 12, when the contact member 052 is in contact with the inner wall of the housing of the lithium thionyl chloride battery along the radial direction of the alignment hole 111a, the first insulating member 053 is located on the side of the contact member 052 that is closer to the inner wall of the housing. As shown in Figure 13, when the contact member 052 is in contact with the pole column along the radial direction of the alignment hole 111a, the first insulating member 053 is located on the side of the contact member 052 that is closer to the pole column.

[0119] Typically, some lithium thionyl chloride batteries collect current using current-collecting pins or rods, and these pins / rods are coaxially connected to the pole posts. Other lithium thionyl chloride batteries collect current using current-collecting cylinders, which are connected to the pole posts by pole tabs. Therefore, to avoid interference between the positioning bracket 015 and the pole tabs, the positioning bracket 015 disclosed in the embodiments of this application, which abuts against the pole posts, is primarily applied to lithium thionyl chloride batteries that collect current using current-collecting pins or rods. The positioning bracket 015 disclosed in the embodiments of this application, which abuts against the inner wall of the housing of the lithium thionyl chloride battery, may be applied to lithium thionyl chloride batteries that collect current using current-collecting pins or rods, or to lithium thionyl chloride batteries that collect current using current-collecting cylinders.

[0120] Here, the first insulating member 053 may be bonded to the contact member 052, or it may be formed into the contact member 052 by an injection molding process. The position limiting plate 051 and the contact member 052 may be integrally molded, or they may be joined and integrated by welding. The material of the position limiting plate 051 and the contact member 052 may be, but is not limited to, stainless steel, pure nickel, nickel-plated stainless steel, or nickel-plated cold-rolled carbon steel. The material of the first insulating member 053 may be, but is not limited to, polytetrafluoroethylene.

[0121] Furthermore, the frictional force between the contact member 052 and the component in contact with this contact member 052 is less than the force that the positive electrode exerts on the positioning bracket 015 after it absorbs the electrolyte and expands. Therefore, when the electrolyte is injected, the positive electrode absorbs the electrolyte and expands, then comes into contact with the positioning bracket 015 and can push the positioning bracket 015 to move.

[0122] In this embodiment, by applying the positioning bracket 015 to a lithium thionyl chloride battery, after the positive electrode absorbs liquid and expands to generate an upward pushing force on the positioning bracket 015, the positioning bracket 015 can be moved upward in accordance with the expansion of the positive electrode until the expansion is complete. At that time, the position of the positioning bracket 015 coincides with the height after the positive electrode has absorbed liquid and expanded, thereby enabling the position of the positioning bracket 015 to be adaptively adjusted based on the height of the expanded positive electrode, and ultimately matching the position of the positioning bracket 015 to the height of the expanded positive electrode. Thus, damage to the positioning bracket 015 due to the relatively large upward pushing force from the positive electrode can be avoided, and discharge failure of the lithium thionyl chloride battery due to the presence of a gap between the positive electrode and the positioning bracket 015 can be avoided.

[0123] Furthermore, by having the positioning bracket 015 abut against the pole column or the inner wall of the housing, it is possible to further suppress the liquid-absorbing expansion of the positive electrode to some extent, thereby improving the agreement between the discharge capacity of the lithium thionyl chloride battery and the actual discharge amount.

[0124] Referring to Figure 12, in one embodiment, when the contact member 052 is in contact with the inner wall of the housing along the radial direction of the alignment hole 111a, the contact member 052 is provided on the periphery of the position limiting plate 051. Accordingly, the first insulating member 053 is provided on the side of the contact member 052 that is closer to the inner wall of the housing.

[0125] In this embodiment, by providing the contact member 052 on the periphery of the position limiting plate 051, the contact member 052 and the position limiting plate 051 can be formed at the same time by press working, thereby increasing the manufacturing efficiency of the positioning bracket 015.

[0126] Referring to Figure 12, in one embodiment, the contact member 052 has a cylindrical structure. One end of the contact member 052 is connected to the periphery of the position limiting plate 051. The outer wall of the contact member 052 is configured to abut against the inner wall of the housing along the radial direction of the alignment hole 111a.

[0127] For example, when applied to a lithium thionyl chloride battery, the contact member 052 is provided coaxially with the pole column.

[0128] In this embodiment, by making the contact member 052 a cylindrical structure, the contact surface between the positioning bracket 015 and the lithium thionyl chloride battery is increased and made more symmetrical. This improves the stress state of the positioning bracket 015 and the housing of the lithium thionyl chloride battery, avoids excessive stress concentration, and ultimately improves reliability.

[0129] Referring to Figure 12, in one embodiment, the first insulating member 053 extends to the end of the contact member 052 away from the position limiting plate 051.

[0130] To understand this, when a lithium thionyl chloride battery discharges at high temperatures, the positive electrode expands relatively significantly, pushing the positioning bracket 015 upwards. However, if the positioning bracket 015 moves too far upwards, there is a risk of a short circuit due to contact with the cover.

[0131] As described above, in this embodiment, with the arrangement described above, the positioning bracket 015 can be insulated from the cover when it is pushed upward to the cover by the expanded positive electrode, thereby improving reliability and contributing to the normal discharge of the lithium thionyl chloride battery.

[0132] In one embodiment, the first insulating member 053 is an elastic insulating member.

[0133] In this embodiment, by making the first insulating member 053 an elastic insulating member, when the positive electrode expands and pushes the positioning bracket 015 upward, causing the positioning bracket 015 to come into contact with the cover, the first insulating member 053 is compressed. On the other hand, when the positive electrode of the lithium thionyl chloride battery contracts, the deformation recovery force of the first insulating member 053 pushes the positioning bracket 015 downward, returning the positioning bracket 015 to its original position and maintaining the position limiting effect on the positive electrode. Therefore, the degree of matching between the position of the positioning bracket 015 and the height of the positive electrode can be increased, improving the agreement between the discharge capacity of the lithium thionyl chloride battery and the actual discharge amount, and ultimately improving the reliability of the lithium thionyl chloride battery.

[0134] Referring to Figure 14, which is an enlarged view of portion H in Figure 12. In one embodiment, a protrusion 133 is provided at the end of the first insulating member 053 that is away from the position limiting plate 051.

[0135] In this embodiment, by providing the protrusion 133, the amount of deformation of the first insulating member 053 is increased, thereby increasing the deformation recovery force of the first insulating member 053 after it has been pressed, and ultimately ensuring that the deformation recovery force of the first insulating member 053 is able to push the positioning bracket 015 downward to a position that matches the height of the positive electrode.

[0136] Referring to Figure 14, in one embodiment, the protrusion 133 extends along the circumferential direction of the alignment hole 111a to form an annular structure, or there are multiple protrusions 133, which are spaced apart along the circumferential direction of the alignment hole 111a.

[0137] In this embodiment, the above-described arrangement increases the contact surface between the protrusion 133 and the cover, improving the stress state of the cover, preventing damage to the cover due to stress concentration, and ultimately improving the reliability of the lithium thionyl chloride battery.

[0138] Referring to Figure 12, in one embodiment, the contact member 052 includes a cylindrical portion 121a and a ring portion 122a. One end of the cylindrical portion 121a is connected to the periphery of the position limiting plate 051. The other end of the cylindrical portion 121a is provided with a second curved edge portion 123. The outer circumference of the second curved edge portion 123 is connected to one end of the ring portion 122a. The ring portion 122a is fitted to the end of the cylindrical portion 121a that is away from the position limiting plate 051. The outer wall of the ring portion 122a is configured to abut against the inner wall of the housing along the radial direction of the alignment hole 111a. The outer wall of the ring portion 122a is provided with a first insulating member 053.

[0139] As an example, the ring portion 122a, the cylindrical portion 121a, the second curved edge portion 123, and the position limiting plate 051 are integrally molded, specifically by press molding.

[0140] In this embodiment, the above-described arrangement simplifies the overall structure of the positioning bracket 015, making it easier to manufacture and thus reducing the manufacturing cost of the lithium thionyl chloride battery.

[0141] Referring to Figure 14, in one embodiment, a second through-hole 1231 is provided in the second curved edge portion 123. The first insulating member 053 extends into the second through-hole 1231 and is connected to the hole wall of the second through-hole 1231.

[0142] Because the materials of the first insulating member 053 and the contact member 052 are different, the bonding strength between them is relatively weak, and the end of the first insulating member 053 closest to the alignment hole 111a tends to detach from the contact member 052.

[0143] As described above, in this embodiment, the connection strength between the first insulating member 053 and the contact member 052 can be increased by the arrangement described above, thereby improving the reliability of the connection between the first insulating member 053 and the contact member 052.

[0144] Referring to Figure 14, in one embodiment, the positioning bracket 015 further includes a second insulating member 054. The second insulating member 054 is provided on the side of the second curved edge portion 123 that is closer to the position limiting plate 051. The second insulating member 054 is connected to the portion of the first insulating member 053 that is located within the second through-hole 1231.

[0145] Here, the first insulating member 053 and the second insulating member 054 are made of the same material and may both be formed into the contact member 052 by an injection molding process. Specifically, first, the contact member and the position limiting plate 051, which are integrally connected, are press-molded and then placed in an injection molding die. Next, the cavity of the die is filled with injection fluid, and when the injection fluid solidifies, a positioning bracket 015 to which the first insulating member 053 and the second insulating member 054 are attached is formed.

[0146] In this embodiment, with the arrangement described above, if the end of the first insulating member 053 closest to the alignment hole 111a is separated from the contact member, the second insulating member 054 provides an tensile force against the separation of the first insulating member 053, thereby restricting the first insulating member 053 from separating from the contact member, and thereby improving the reliability of the connection between the first insulating member 053 and the contact member.

[0147] Referring to Figure 14, in one embodiment, the ring portion 122a is provided within the first insulating member 053.

[0148] In this embodiment, the above-described arrangement increases the connection surface area between the first insulating member 053 and the ring portion 122a, thereby improving the reliability of the connection between the ring portion 122a and the first insulating member 053 and preventing them from separating from each other.

[0149] Referring to Figure 12, in one embodiment, the cylindrical portion 121a is a conical cylinder, and the small-diameter end of the conical cylinder is located close to the position limiting plate 051.

[0150] Here, in the longitudinal section of the cylindrical portion 121a, the angle between the conical surface of the cylindrical portion 121a and the axis of the cylindrical portion 121a is 2° to 5°, and may be 2°, 2.5°, 3°, 3.1°, 3.8°, 4°, 4.7°, or 5°, but is not limited to these.

[0151] In this embodiment, the above-described arrangement causes the positioning bracket 015 to connect and integrate with the position limiting plate 051, which is in contact with the positive electrode by the cylindrical portion 121a, and the end portion that is in contact with the inner wall of the housing. In this way, interference between the cylindrical portion 121a and the edge film can be avoided, while the distance between the positioning bracket 015 and the negative electrode can be increased. Therefore, the reliability of the lithium thionyl chloride battery can be improved.

[0152] Referring to Figure 12, in one embodiment, a second curved portion 112a is provided on the periphery of the alignment hole 111a along the axial direction of the alignment hole 111a, and the second curved portion 112a is located on the side of the position limiting plate 051 closer to the contact member 052. The second curved portion 112a is fitted onto the current collection pin 011.

[0153] Here, a chamfer is provided at the connection point between the second curved section 112a and the position limiting plate 051, specifically a rounded chamfer.

[0154] To make it clear, other components are provided between some lithium thionyl chloride batteries, while in this embodiment, by providing the second curved portion 112a, the positioning bracket can be brought into contact with other components by the second curved portion 112a during the mounting process, thus preventing the end of the alignment hole 111a from damaging other components.

[0155] Furthermore, by providing a chamfer at the connection point between the second curved portion 112a and the position limiting plate 051, the mounting of the positioning bracket 015 is guided, and damage to other parts when mounting the positioning bracket 015 can be avoided.

[0156] Referring to Figure 12, in one embodiment, the inner circumferential surface of the second curved portion 112a is a conical surface, and the large-diameter end of the conical surface is located close to the position limiting plate 051.

[0157] Here, in the longitudinal section of the second curved portion 112a, the angle between the inner circumferential surface of the second curved portion 112a and the axis of the second curved portion 112a is 1° to 10°, and may be, but is not limited to, 1°, 2.5°, 4°, 5.1°, 6.8°, 8°, 9.7°, or 10°.

[0158] In this embodiment, the above-described arrangement improves the guiding performance when attaching the positioning bracket, thereby preventing the positioning bracket 015 from damaging other parts.

[0159] Referring to Figure 15, which is an enlarged view relating to part I of Figure 12. In one embodiment, the inner circumferential surface of the second curved portion 112a is a conical surface at the end closest to the position limiting plate 051, and a cylindrical surface 1121a at the other end.

[0160] In this embodiment, with the arrangement described above, after the positioning bracket 015 is assembled, it is bonded to the other parts by the cylindrical surface 1121a, thereby increasing the contact surface between the positioning bracket 015 and the other parts, improving the stress state of the other parts, and avoiding localized stress concentration. Thus, the reliability of the lithium thionyl chloride battery can be improved.

[0161] Referring to Figure 14, in one embodiment, a chamfer is provided on the end of the outer surface of the first insulating member 053 that is close to the position limiting plate 051, and specifically, a rounded chamfer is provided.

[0162] In this embodiment, with the arrangement described above, when attaching the positioning bracket 015, the chamfered opening in the housing guides the attachment of the positioning bracket 015, reducing collisions and attachment resistance when the positioning bracket 015 is incorporated into the housing, thereby improving attachment efficiency.

[0163] Referring to Figure 13, in one embodiment, when the contact member 052 is configured to contact the pole column along the radial direction of the alignment hole 111a, the contact member 052 is provided on the periphery of the alignment hole 111a. Accordingly, the first insulating member 053 is provided on the side of the contact member 052 that is closer to the pole column.

[0164] In this embodiment, by providing the contact member 052 on the periphery of the alignment hole 111a, the contact member 052 and the position limiting plate 051 can be formed at the same time by press working, thereby increasing the manufacturing efficiency of the positioning bracket 015.

[0165] Referring to Figure 13, in one embodiment, the contact member 052 has a cylindrical structure, one end of the contact member 052 is connected to the periphery of the alignment hole 111a, the contact member 052 is configured to fit onto the pole column, and the inner wall of the contact member 052 is configured to contact the pole column along the radial direction of the alignment hole 111a.

[0166] In this embodiment, by making the contact member 052 a cylindrical structure, the contact surface between the positioning bracket 015 and the lithium thionyl chloride battery is increased and made more symmetrical. This improves the stress state of the positioning bracket 015 and the housing of the lithium thionyl chloride battery, avoids excessive stress concentration, and ultimately improves reliability.

[0167] Referring to Figure 13, in one embodiment, the first insulating member 053 extends to the end of the contact member 052 away from the position limiting plate 051.

[0168] To understand this, when a lithium thionyl chloride battery discharges at high temperatures, the expansion of the positive electrode is relatively high, pushing the positioning bracket 015 upward. On the other hand, if the positioning bracket 015 moves too far upward, there is a risk of a short circuit due to contact with the cover.

[0169] As described above, in this embodiment, with the arrangement described above, the positioning bracket 015 can be insulated from the cover when it is pushed upward to the cover by the expanded positive electrode, thereby improving reliability and contributing to the normal discharge of the lithium thionyl chloride battery.

[0170] In one embodiment, the first insulating member 053 is an elastic insulating member.

[0171] In this embodiment, by making the first insulating member 053 an elastic insulating member, when the positive electrode expands and pushes the positioning bracket 015 upward, causing the positioning bracket 015 to come into contact with the cover, the first insulating member 053 is compressed. On the other hand, when the positive electrode of the lithium thionyl chloride battery contracts, the deformation recovery force of the first insulating member 053 pushes the positioning bracket 015 downward, returning the positioning bracket 015 to its original position and maintaining the position limiting effect on the positive electrode. Therefore, the degree of matching between the position of the positioning bracket 015 and the height of the positive electrode can be increased, improving the agreement between the discharge capacity of the lithium thionyl chloride battery and the actual discharge amount, and ultimately improving the reliability of the lithium thionyl chloride battery.

[0172] Referring to Figure 16, which is a schematic diagram showing the structure of a positioning bracket 015 in another cover assembly 001 provided in an embodiment of the present application. In one embodiment, a base portion 132 is provided at the end of the first insulating member 053 away from the position limiting plate 051.

[0173] In one embodiment, the base portion 132 is provided around the axis of the alignment hole 111a, and the base surface of the base portion 132 extends to the alignment hole 111a.

[0174] In this embodiment, by providing the base portion 132, the thickness of the first insulating member 053 can be reduced, increasing the amount of deformation of the first insulating member 053, and consequently increasing the deformation recovery force of the first insulating member 053 after being pressed. Therefore, it can be ensured that the deformation recovery force of the first insulating member 053 is capable of pushing the positioning bracket 015 downward to a position that matches the height of the positive electrode.

[0175] Referring to Figure 16, in one embodiment, the outer surface of the first insulating member 053 is a conical surface. The small-diameter end of the conical surface is located close to the position limiting plate 051.

[0176] Here, in the longitudinal section of the first insulating member 053, the angle between the outer surface of the first insulating member 053 and the axis of the first insulating member 053 is 5° to 15°, and may be 5°, 7.5°, 8°, 9.3°, 10.8°, 12°, 13°, or 15°, but is not limited to these.

[0177] In this embodiment, the above-described arrangement allows the deformation direction of the first insulating member 053 after being pressed to be aligned, thereby improving the stress state of the first insulating member 053 after being pressed, and ultimately improving the reliability of the positioning bracket 015.

[0178] Referring to Figure 16, in one embodiment, a first curved edge portion 124 is provided at the end of the contact member 052 that is away from the position limiting plate 051, and the first curved edge portion 124 is provided inside the first insulating member 053.

[0179] Because the materials of the first insulating member 053 and the contact member 052 are different, the bonding strength between them is relatively weak, making it easy for the first insulating member 053 to detach from the contact member 052.

[0180] As described above, in this embodiment, the connection strength between the first insulating member 053 and the contact member 052 can be increased by the arrangement described above, thereby improving the reliability of the connection between the first insulating member 053 and the contact member 052.

[0181] Referring to Figure 16, in one embodiment, a first curved portion 113a is provided on the outer circumference of the position limiting plate 051 along the axial direction of the alignment hole 111a, and the first curved portion 113a is located on the side of the position limiting plate 051 closer to the contact member 052.

[0182] Here, a chamfer is provided at the connection point between the first curved section 113a and the position limiting plate 051.

[0183] To make it easier to understand, an edge film is provided on the outside of the positive electrode of the lithium thionyl chloride battery. In this embodiment, by providing the first curved portion 113a, the positioning bracket can be brought into contact with the edge film by the first curved portion 113a during the mounting process, thereby preventing the end of the position limiting plate 051 from damaging the edge film.

[0184] Furthermore, by providing a chamfer at the connection point between the first curved portion 113a and the position limiting plate 051, the mounting of the positioning bracket 015 is guided, and damage to the edge film when mounting the positioning bracket 015 can be avoided.

[0185] Referring to Figures 12, 13, and 16, in one embodiment, the position limiting plate 051 is provided with a plurality of third through-holes 114a.

[0186] As an example, the third through-holes 114a are in multiple groups, and the groups of third through-holes 114a are provided at equal intervals around the axial direction of the first shaft hole, and each of the groups of third through-holes 114a includes multiple third through-holes 114a provided at intervals along the radial direction of the alignment hole 111a.

[0187] In this embodiment, by providing a third through-hole 114a in the position limiting plate 051, the electrolyte of the lithium thionyl chloride battery is allowed to flow through the third through-hole 114a, thereby increasing the fluidity of the electrolyte and, consequently, improving the reliability of the lithium thionyl chloride battery.

[0188] In one embodiment, the position limiting plate 051 is configured such that the distance between it and the positive electrode is 1.5 mm or less, and / or the contact member 052 is configured such that the distance between it and the cover of the lithium thionyl chloride battery is 2.5 mm or more.

[0189] Specifically, the position limiting plate 051 is configured such that the distance between it and the positive electrode is 1.5 mm or less, or the contact member 052 is configured such that the distance between it and the cover of the lithium thionyl chloride battery is 2.5 mm or more. Alternatively, the position limiting plate 051 is configured such that the distance between it and the positive electrode is 1.5 mm or less, and the contact member 052 is configured such that the distance between it and the cover of the lithium thionyl chloride battery is 2.5 mm or more.

[0190] As an example, the distance between the position limiting plate 051 and the positive electrode includes, but is not limited to, 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 0.1 mm, 1.3 mm, and 1.5 mm. The distance between the contact member 052 and the cover of the lithium thionyl chloride battery is 2.5 mm to 15 mm, and includes, but is not limited to, 0, 2.5 mm, 2.8 mm, 3.3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 13 mm, 14 mm, and 15 mm.

[0191] Here, when assembling the positioning bracket 015, the positioning bracket 015 is brought into contact with the positive electrode, that is, the distance between the position limiting plate 051 and the positive electrode is set to 0.

[0192] In this embodiment, the above-described limitations prevent a gap from forming between the position limiting plate 051 and the positive electrode after the positive electrode has absorbed liquid and expanded, thereby improving the discharge reliability of the lithium thionyl chloride battery. On the other hand, when the positive electrode has not yet absorbed liquid and expanded, contact between the positioning bracket 015 and the cover can be avoided, improving the stress state of the cover.

[0193] Referring to Figure 8, in one embodiment, the pole column 013 is inserted into the main body 111.

[0194] Specifically, the pole column 013 has a shaft shoulder 131, the small-diameter stepped portion of the pole column 013 is located on the side of the shaft shoulder 131 closer to the main body 111, the small-diameter stepped portion is inserted into the main body 111, and the end of the main body 111 is in contact with the shaft shoulder 131.

[0195] To make it easier to understand, the current collector pin 011 is typically welded to the pole post 013 using a collision welding process. Specifically, a tool is used to grip both the pole post 013 and the current collector pin 011, then the ends of both are pressed together, and then they are welded. However, this process requires that sufficient space be pre-emptively provided on the pole post 013 for gripping with the tool, resulting in a relatively large height dimension for the pole post 013, and consequently occupying a relatively large space inside the battery.

[0196] As described above, in this embodiment, the pole column 013 is inserted into the main body 111, thereby fixing the two together, and the current collection pin 011 is directly welded to the pole column 013 by laser welding. Consequently, there is no need to pre-secure space on the pole column 013 for tool gripping. Therefore, the height dimension of the pole column 013 can be reduced, reducing the space it occupies inside the battery, and consequently, more electrolyte can be filled, improving the reliability of the battery.

[0197] Referring to Figure 11, which is an enlarged view relating to portion E of Figure 6 provided in an embodiment of the present application. In one embodiment, the mounting hole 121 is a secondary stepped hole, the small-diameter stepped portion of the secondary stepped hole is close to the main body 111, and the insulating sealing member 014 is provided between the hole wall of the mounting hole 121 and the pole post 013, with both sides of the insulating sealing member 014 sealed and connected to the outer circumferential surface of the pole post 013 and the hole wall of the mounting hole 121, respectively.

[0198] To understand this, after the battery fluid has been injected, the sealing nail 027 needs to be crimped onto the injection hole 123 in the cover 012. When crimping, the cover 012 is subjected to a relatively large impact force. On the other hand, the pole post 013 is fixed to the cover 012 only by the sealing insulating material. Therefore, when crimping the sealing nail 027, it adversely affects the seal between the pole post 013 and the cover 012.

[0199] As described above, in this embodiment, by making the mounting hole 121 a secondary stepped hole, the contact surface area between the sealing insulating member and the mounting hole 121 is increased, thereby reducing the adverse effect on the sealing between the pole post 013 and the cover 012 when the sealing nail 027 is crimped, and consequently improving the reliability between the pole post 013 and the cover 012.

[0200] Furthermore, the cover 012 is formed by press working using a metal plate with a thickness of 1 mm. In related technologies, the mounting holes 121 are directly press-formed to create holes of uniform diameter. At that time, it is necessary to form higher mounting holes 121 in order to reduce the adverse effects of the sealing nails 027. Typically, it is necessary to form mounting holes 121 with a height of 2 mm. However, forming mounting holes 121 with a thickness of 2 mm from a cover 012 with a thickness of 1 mm has high process requirements and is difficult to form. In this embodiment, by the arrangement described above, forming mounting holes 121 with a height of 1.8 mm using a metal plate with a thickness of 1 mm by press working results in a cover assembly 001 with a better sealing effect, reduces the difficulty of forming, and increases manufacturing efficiency.

[0201] Here, the difference in hole diameter between the two-stage holes of the secondary stepped hole may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0202] Referring to Figure 11, in one embodiment, the cover 012 is provided with an injection hole 123, and an annular boss 122 is provided on the side of the cover 012 away from the current collection pin 011, with the annular boss 122 located between the injection hole 123 and the pole column 013.

[0203] To make it clear, the inner diameter of the annular boss 122 matches the diameter of the mounting hole 121 on the side closer to the annular boss 122. The sealing insulating member extends between the annular boss 122 and the pole post 013.

[0204] Therefore, when the sealing nail 027 is pressed, the impact force on the cover 012 becomes relatively large, which adversely affects the sealing between the pole column 013 and the cover 012.

[0205] As described above, in this embodiment, by providing the annular boss 122, the impact on sealing between the pole column 013 and the cover 012 when the nail is crimped can be reduced.

[0206] Referring to Figure 11, in one embodiment, the cover 012 is a pressed part, and a first annular groove 124 is provided on the side of the cover 012 closest to the current collection pin 011, and the first annular groove 124 is provided opposite to the annular boss 122.

[0207] To understand this, since the cover 012 is a pressed part, its middle section needs to be pressed toward the inside of the battery to form mounting holes 121 that cooperate with the pole posts 013. On the other hand, in order to form the annular boss 122, the cover 012 needs to have more material in the annular boss 122. Also, increasing the thickness of the metal sheet used to directly form the cover 012 would not only result in an increase in material but also involve many process changes.

[0208] As described above, in this embodiment, when press working, the position limiting structure in the mold restricts the downward movement of the material in the annular groove portion, thereby forming an annular groove on the side of the cover 012 closer to the battery cell and forming an annular boss 122 on the side of the cover 012 further away from the inside of the battery. In this way, the adverse effects on sealing due to nail crimping are reduced, and a metal plate is formed that does not require increasing the thickness of the cover 012, thereby controlling related process changes and ultimately controlling the manufacturing cost of the cover 012.

[0209] Referring to Figure 6, in one embodiment, a boss 125 is provided on the side of the cover 012 closest to the current collection pin 011, and the boss 125 extends along the circumferential direction of the mounting hole 121.

[0210] To make it clear, if cover 012 is a pressed part, then boss 125 is formed by press working.

[0211] In this embodiment, the above-described arrangement increases the sealing bonding surface between the cover 012 and the pole post 013, thereby improving the reliability of the sealing between the cover 012 and the pole post 013.

[0212] Referring to Figure 17, which is a schematic diagram showing the structure of a battery provided in an embodiment of the present application. Accordingly, the embodiment of the present application further includes a battery, which includes a current collector pin 011 disclosed in some embodiments of the present application, or a cover assembly 001 disclosed in some embodiments of the present application.

[0213] To make it easier to understand, the battery further includes a housing 021, a bottom film 022 located inside the housing 021, an edge film 023, a negative electrode 024 located between the edge film 023 and the housing 021, a positive electrode 025 located inside the edge film 023, and an upper cover film 026 covering the top of the positive electrode. The cover 012 is provided to cover the opening of the housing 021 and is sealed to the opening of the housing 021. A current collector pin 011 is inserted into the positive electrode. After the liquid injection is complete, the liquid injection hole 123 in the cover 012 is sealed and closed using a sealing nail 027.

[0214] As shown in Figure 18, Figure 18 is an enlarged view relating to portion G in Figure 17, where the contact portion 1513 is in contact with the positive electrode 025 after passing through the upper cover film 026.

[0215] In this embodiment, by using the current collector pin 011 or cover assembly 001 disclosed in some embodiments of the present application, the space occupied by the current collector pin 011 inside the battery can be controlled, and the surface area of ​​the outer surface of the current collector pin 011 can be increased. This increases the contact area between the current collector pin 011 and the positive electrode, and consequently increases the current collection area of ​​the current collector pin 011. Therefore, the discharge current of the battery can be increased, and the range of applications for the battery can be expanded.

[0216] Furthermore, if a positioning bracket 015 is provided in the battery, there is a gap between the contact portion 151 and the positive electrode before the electrolyte is injected into the battery. Optionally, this gap is 1 to 4 mm, for example, it may be 2 mm. This gap provides a buffer space for expansion due to electrolyte impregnation, improving the stress state of the positioning bracket 015, electrode column 013, and cover 012, thereby improving the reliability of the battery.

[0217] Referring to Figures 19, 20, or 21, Figure 19 is a schematic diagram showing the structure of another battery 002 provided in embodiments of the present application, Figure 20 is a schematic diagram showing the structure of another battery 002 provided in embodiments of the present application, and Figure 21 is a schematic diagram showing the structure of another battery 002 provided in embodiments of the present application. Accordingly, embodiments of the present application further provide a battery 002 which includes a housing 021, a cover 012, poles 013, a cell pack, and a positioning bracket 015 disclosed in some embodiments of the present application. The housing 021 has a housing cavity. The cover 012 covers the housing 021. The poles 013 are penetrated by the cover 012. The cell pack is provided in the housing cavity. The cell pack includes a bottom film 022, an upper cover film 026, and a positive electrode 025, an edge film 023, and a negative electrode 024 arranged in order from the center outward of the housing 021. The bottom film 022 is provided on the bottom wall of the housing cavity. The upper cover film 026 is provided at the end of the positive electrode 025 away from the bottom film 022. Here, the position limiting plate 051 is provided opposite the positive electrode 025. The contact member 052 is in contact with the pole column or the inner wall of the housing 021 along the radial direction of the alignment hole 111a. The first insulating member 053 insulates the contact member 052 from the component in contact with the contact member 052, and the positioning bracket 015 is provided at a distance from the cover 012.

[0218] To make it easier to understand, when assembling, the position limiting plate 051 may be in contact with the positive electrode 025, or a certain amount of gap may be left. The battery 002 in this embodiment is a lithium thionyl chloride battery.

[0219] In this embodiment, by using the positioning bracket 015 disclosed in some embodiments of the present application, when electrolyte is injected into the battery 002 and the positive electrode 025 absorbs the electrolyte and expands, the expanded positive electrode 025 can push and move the positioning bracket 015. This allows the position of the positioning bracket 015 to be adaptively adjusted based on the expansion height of the positive electrode 025, and ultimately the position of the positioning bracket 015 after impregnation with the battery 002 can be matched with the expansion height of the positive electrode 025. Therefore, damage to the positioning bracket 015 due to the relatively large upward pushing force of the positive electrode 025 can be avoided, and the reliability of the battery 002 can be improved by avoiding discharge failure of the battery 002 due to the gap between the positive electrode 025 and the positioning bracket 015. [Explanation of symbols]

[0220] 001: Cover Assembly 011: Current collection pin 111: Main unit 112:Groove body 1121: First circular arc surface 1122: Second circular arc surface 1123: Third circular arc surface 1124: Fourth circular arc surface 1111:Hollow structure 1112: Top through hole 1113: Bottom through hole 1114: Variable diameter section 1115: Chamfering 113: Head section 114: Middle Section 115: Tail section 012: Cover 121: Mounting hole 122: Ring Boss 123: Liquid injection hole 124: First annular groove 125: Boss 013: Polar pillar 131: Axis shoulder 014: Insulating sealing material 015: Positioning bracket 151: Contact part 1511: First through hole 1512: Subject 1523: Contact area 152: Sleeve connection part 153: Positioning ring 002:Battery 021: Cabinet 022: Bottom film 023: Edge Film 024: Negative electrode 025: Positive electrode 026: Top cover film 027: Sealing Nail 015: Positioning bracket 051: Position restriction sign 111a: Alignment hole 112a: Second curved section 1121a: Cylindrical surface 113a: First curved section 114a: Third through hole 052: Contact Member 121a: Cylinder part 122a: Ring section 123: Second curved edge 1231: Second through hole 124: First curved edge 053: First insulating member 133: Convex part 132: Stand 054: Second insulating member

Claims

1. A current collector pin (011) including a main body (111), wherein a groove (112) is provided on the outer circumferential surface of the main body (111), The groove (112) is provided extending along the circumferential direction of the main body (111), The groove body (112) is an annular groove, and the axis of the annular groove is parallel to the axis of the current collection pin (011). The annular grooves are multiple in number, and the multiple annular grooves are arranged sequentially along the direction of extension of the axis of the current collection pin (011). The surface of the main body (111) located between two adjacent annular grooves is a first arcuate surface (1121), the first arcuate surface (1121) is convex away from the axis of the current collector pin (011), and both sides of the first arcuate surface (1121) are smoothly connected to the groove walls of the adjacent annular grooves, respectively, for the current collector pin (011).

2. The bottom wall of the annular groove is a second arcuate surface (1122), the second arcuate surface (1122) is recessed at a position close to the axis of the current collection pin (011), and both sides of the second arcuate surface (1122) are smoothly connected to the adjacent first arcuate surface (1121). The current collector pin (011) according to claim 1.

3. The maximum outer diameter of the main body (111) is D, the radius of the first arc surface (1121) is R1, and the radius of the second arc surface (1122) is R2, where R1 and R2 satisfy R2 < R1, and further satisfy 0 < R1 ≤ 0.2D, or 0 < R2 ≤ 0.2D, or 0 < R1 ≤ 0.2D and 0 < R2 ≤ 0.2D. The current collector pin (011) according to claim 2.

4. The cross-section of the current collection pin (011) is one plane on which the axis is located, the first circular arc surface (1121) has an arc of π, the second circular arc surface (1122) has an arc of π, and the first circular arc surface (1121) is tangent to the adjacent second circular arc surface (1122). The current collector pin (011) according to claim 2.

5. The number of the first circular arc surface (1121) is m, the number of the second circular arc surface (1122) is n, and m = n + 1, where both m and n are natural numbers greater than 0. The current collector pin (011) according to claim 2.

6. A current collector pin (011) including a body (111), wherein a groove (112) is provided on the outer circumferential surface of the body (111), The groove body (112) is a helical groove, and the helical center line of the helical groove is parallel to the axis of the current collection pin (011). The bottom wall of the helical groove is a third arcuate surface (1123), the third arcuate surface (1123) is recessed at a position close to the axis of the current collection pin (011), and both sides of the third arcuate surface (1123) are smoothly connected to the outer circumferential surface of the main body (111). Current collection pin (011).

7. At least a portion of the outer circumferential surface of the main body (111) is a helical surface, the helical surface is a fourth circular arc surface (1124), the fourth circular arc surface (1124) is convex away from the axis of the current collection pin (011), and both sides of the fourth circular arc surface (1124) are smoothly connected to the adjacent third circular arc surface (1123), respectively. The current collector pin (011) according to claim 6.

8. The maximum outer diameter of the main body (111) is D, the radius of the third arc surface (1123) is R3, and the radius of the fourth arc surface (1124) is R4, where R3 and R4 satisfy R3 < R4, and further satisfy 0 < R3 ≤ 0.2D, or 0 < R4 ≤ 0.2D, or 0 < R3 ≤ 0.2D and 0 < R4 ≤ 0.2D. The current collector pin (011) according to claim 7.

9. The cross-section of the current collection pin (011) is a plane on which the axis of the pin lies, the arc of the third circular arc surface (1123) is π, the arc of the fourth circular arc surface (1124) is π, and the third circular arc surface (1123) is tangent to the adjacent fourth circular arc surface (1124). The current collector pin (011) according to claim 7.

10. A current collector pin (011) including a body (111), wherein a groove (112) is provided on the outer circumferential surface of the body (111), The main body (111) has a hollow structure (1111) and a uniform wall thickness, and at both ends of the main body (111) there are upper end through holes (1112) and lower end through holes (1113) that communicate with the interior of the main body (111), respectively. Current collection pin (011).

11. A current collector pin (011) including a body (111), wherein a groove (112) is provided on the outer circumferential surface of the body (111), The ends of the main body (111) are a tip and a end, respectively, with the tip configured to be connected to the pole (013) of the battery (002), the main body (111) having a variable diameter portion (1114) located at the end, the outer diameter of the variable diameter portion (1114) gradually decreasing along the direction away from the tip, and a chamfer (1115) is provided between the outer circumferential surface of the main body (111) and the end face of the end. Current collection pin (011).

12. A current collector pin (011) comprising a main body (111), wherein a groove (112) is provided on the outer circumferential surface of the main body (111), A conductive layer is provided on the outer surface of the main body (111) and / or on the inner wall of the groove (112), and the conductive layer is one or more of the following: a nickel plating layer, a gold plating layer, and a carbon coating layer. Current collection pin (011).

13. Along the axial direction of the current collection pin (011), the main body (111) includes a head portion (113), a middle portion (114), and a tail portion (115) connected in order, and the groove body (112) is provided in the middle portion (114), the length of the main body (111) is L0, the length of the middle portion (114) is L1, and 0 < L1 ≤ 0.7L0. A current collector pin (011) according to any one of claims 1, 6, and 10 to 12.

14. A cover (012) having mounting holes (121), A pole post (013) is inserted through the mounting hole (121) and connected to the cover (012) by an insulating sealing member (014), Including a main body (111), the outer circumferential surface of the main body (111) is provided with a groove (112), and one end of the main body (111) is connected to the pole column (013), including a current collection pin (011), Cover assembly (001).

15. The cover assembly (001) described in claim 14 is included, Battery (002).

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