Collecting pin, 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] The present application relates to the field of battery technology, and more particularly to a current collecting pin, a cover assembly, and a battery.

[0002] This application claims priority from international application PCT / CN2024 / 121452 and Chinese application numbers 202410460455.5, 202420793926.X and 202420793895.8, respectively, and incorporates the entire disclosures of said applications by reference. [Background technology]

[0003] In related technology, 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, and a top cover film, all of which are provided within the housing, and a cover assembly that closes the housing. The cover assembly includes a cover, a pole insulated from the cover by a glass seal, and a current collecting pin that connects the pole to the positive electrode. Summary of the Invention [Problem to be solved by the invention]

[0004] The relatively small size of the current collector pins reduces their current collection area, resulting in a small discharge current of the lithium thionyl chloride battery using the current collector pins, which in turn limits the range of application of the lithium thionyl chloride battery.On the other hand, if the size of the current collector pins is increased to increase their current collection area, the current collector pins will occupy more space inside the battery, which will have a negative impact on the energy density of the lithium thionyl chloride battery. [Means for solving the problem]

[0005] The present application provides a current collecting pin, a cover assembly, and a battery, which can overcome the problem of the current collecting area of ​​the current collecting pin being relatively small.

[0006] In a first aspect, the present application provides a current collector pin, the current collector pin including a body having a groove formed on an outer circumferential surface of the body.

[0007] In a second aspect, the present application provides a cover assembly, the cover assembly including a cover, a pole, and the above-mentioned current collecting pin. The cover has a mounting hole, and the pole is inserted through the mounting hole and connected to the cover via an insulating sealing member. One end of the body is connected to the pole.

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

[0009] [Figure 1] 1 is a schematic diagram showing the structure of a current collecting pin provided in an example of the present application. FIG. [Figure 2] FIG. 2 is an enlarged view of part A of FIG. 1 provided in the examples of the present application. [Figure 3] FIG. 2 is a schematic diagram showing the structure of another current collecting pin provided in an embodiment of the present application. [Figure 4] FIG. 4 is an enlarged view of part B of FIG. 3 provided in the examples of the present application. [Figure 5] FIG. 2 is an enlarged view of part C of FIG. 1 provided in the examples of the present application. [Figure 6] 1 is a schematic diagram showing the structure of a cover assembly provided in an embodiment of the present application. [Figure 7] 10 is a schematic diagram showing the structure of another cover assembly provided in an embodiment of the present application. FIG. [Figure 8] FIG. 8 is an enlarged view of part D of FIG. 7 provided in an example of the present application. [Figure 9] 10 is a schematic diagram showing the structure of another cover assembly provided in an embodiment of the present application. FIG. [Figure 10]FIG. 10 is an enlarged view of part F in FIG. 9. [Figure 11] FIG. 7 is an enlarged view of part E of FIG. 6 provided in the examples of the present application. [Figure 12] 10 is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiment of the present application. FIG. [Figure 13] 10 is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiment of the present application. FIG. [Figure 14] FIG. 13 is an enlarged view of part H in FIG. [Figure 15] FIG. 13 is an enlarged view of part I in FIG. [Figure 16] 10 is a schematic diagram showing the structure of another positioning bracket in the cover assembly provided in the embodiment of the present application. FIG. [Figure 17] FIG. 1 is a schematic diagram showing the structure of a battery provided in an example of the present application. [Figure 18] FIG. 18 is an enlarged view of a portion G in FIG. [Figure 19] FIG. 2 is a schematic diagram showing the structure of another battery provided in an example of the present application. [Figure 20] FIG. 2 is a schematic diagram showing the structure of another battery provided in an example of the present application. [Figure 21] FIG. 2 is a schematic diagram showing the structure of another battery provided in an example of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0010] Referring to Fig. 1, Fig. 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] As can be understood, the structural shape of the grooved body 112 is not particularly limited, and the grooved body 112 may be a groove, and there may be a plurality of grooves distributed along the circumferential and axial directions of the current collecting pin 011. The grooved body 112 may also be an annular groove, a spiral groove, etc.

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

[0013] In this embodiment, by providing grooves 112 on the outer peripheral surface of main body 111, the space occupied by current collector pins 011 inside the battery can be controlled and the area of ​​the outer surface of current collector pins 011 can be increased, thereby increasing the contact area between current collector pins 011 and the positive electrode and thus increasing the current collection area of ​​current collector pins 011. Therefore, the discharge current of a lithium thionyl chloride battery using this current collector pin 011 can be made relatively large, thereby expanding the range of applications of thionyl chloride lithium batteries.

[0014] Furthermore, assuming that the current collector pin 011 has the same outer diameter as other current collector pins 011, the current collector pin 011 provided in this embodiment has a groove 112 on the outer peripheral surface of the body 111, which allows the positive electrode to be filled into the groove 112, thereby reducing the space occupied by the current collector pin 011 inside the battery and ultimately increasing the energy density of the lithium thionyl chloride battery.

[0015] In one embodiment, the groove 112 extends circumferentially around the body 111. As can be appreciated, the groove 112 may extend circumferentially around the body 111 and be an annular or spiral groove, or may be a multi-tiered groove or other structure spaced apart around the body 111.

[0016] Here, when the groove body 112 is an annular groove extending along the circumferential direction of the main body 111, refer to Fig. 2, which is an enlarged view of part A in Fig. 1 provided in an 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 collecting pin 011.

[0017] Optionally, the axis of the annular groove is aligned in the same line as the axis of the current collecting pin 011 .

[0018] In this embodiment, the current collecting pins 011 are arranged in a centrosymmetrical manner as described above, which improves the stress state of the current collecting pins 011 and thereby increases the reliability of the current collecting pins 011.

[0019] Referring to FIG. 1, in one embodiment, there are a plurality of annular grooves, and the plurality of annular grooves are provided in order along the direction in which the axis of the current collecting pin 011 extends.

[0020] Specifically, the plurality of annular grooves are provided in sequence along the axis of the current collecting pin 011 at equal intervals.

[0021] In this embodiment, the surface area of ​​the current collecting pin 011 is increased by providing multiple annular grooves, thereby forming an embedded structure between the positive electrode and the current collecting pin 011, which provides a larger contact area between the current collecting pin 011 and the positive electrode, thereby increasing the current collecting surface of the current collecting pin 011 and improving the current collecting effect of the current collecting pin 011. Meanwhile, the integrity of the current collecting pin 011 and the positive electrode can be improved, thereby increasing the reliability of cooperation between the current collecting 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 a first arcuate surface 1121, which is convexly provided away from the axis of the current collecting 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 collecting pin 011 more uniform, reducing the possibility of localized stress concentration, and thereby improving the structural stability and durability of the current collecting 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 collecting pin 011, and both sides of the second arcuate surface 1122 are smoothly connected to the adjacent first arcuate surfaces 1121.

[0025] In this embodiment, the above-described arrangement allows the positive electrode to be more effectively filled in the groove body 112, thereby preventing the presence of unfilled areas. On the other hand, the stress in the annular groove of the current collecting pin 011 is more uniform, reducing the possibility of localized stress concentration, thereby improving the structural stability and durability of the current collecting pin 011.

[0026] Furthermore, when the grooved body 112 extends along the circumferential direction of the main body 111 to form a spiral groove, refer to FIG. 3, which is a schematic diagram showing the structure of another current collecting pin 011 provided in an embodiment of the present application. The grooved body 112 is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting pin 011.

[0027] Optionally, the spiral centerline of the spiral groove is aligned in the same line as the axis of the current collecting pin 011 .

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

[0029] Furthermore, by providing the groove body 112 as a spiral groove, the current collecting pin 011 can be screwed into the positive electrode, reducing the interference with the attachment of the current collecting pin 011 from the positive electrode. This increases the efficiency of attaching the current collecting pin 011 to the positive electrode, while also increasing the integrity of the current collecting pin 011 and the positive electrode, and ultimately increasing the reliability of cooperation between the current collecting pin 011 and the positive electrode.

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

[0031] In this embodiment, with the above-described arrangement, the positive electrode can be well filled by the groove body 112, and the presence 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, 0.11 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.

[0041] In this embodiment, by limiting the radius of the first arc surface 1121 as R1, 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 second arc surface 1122 as R2, 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.

[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.

[0044] In this embodiment, due to the above-mentioned limitations, the radius of the first arcuate surface 1121 can be made relatively large while controlling the cross-sectional width of the current collecting pin 011, thereby increasing the strength of the first arcuate surface 1121 and thereby improving the resistance of the first arcuate surface 1121 to external pressure and impact forces, and reducing damage to the current collecting pin 011 caused by collisions during transportation, storage, assembly, etc.

[0045] Here, the width of the horizontal cross section of the current collecting pin 011 is the distance along the radial direction of the current collecting pin 011 between the side of the second arcuate surface 1122 closer to the axis of the current collecting pin 011 and the side of the first arcuate surface 1121 farther from the axis of the current collecting pin 011. By controlling this width, the resistance force exerted when the current collecting pin 011 is inserted into the positive electrode can be controlled, thereby improving assembly efficiency.

[0046] Referring to Figure 2, in one embodiment, the cross section is taken along a plane on the axis of the current collecting pin 011, the arc degree of the first arc surface 1121 is π, the arc degree of the second arc surface 1122 is π, and the first arc surface 1121 is tangent to the adjacent second arc surface 1122.

[0047] As can be seen, the interface between the first arcuate surface 1121 and the second arcuate surface 1122 is a circle disposed about the axis of the current collecting pin 011. The interfaces on either side of the first arcuate surface 1121 are spaced apart along the axis of the current collecting pin 011.

[0048] In this embodiment, the above-mentioned arrangement simplifies the surface structure of the current collecting pin 011 and controls the number of curved surfaces smoothly connected between the first arcuate surface 1121 and the second arcuate surface 1122, thereby reducing the manufacturing complexity of the current collecting pin 011. Meanwhile, by making the first arcuate surface 1121 contact the second arcuate surface 1122, the surface of the current collecting pin 011 can be prevented from having a relatively large number of transition structures, which can reduce stress concentration and ultimately improve the stress state of the current collecting pin 011.

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

[0050] As can be seen, the second arcuate surface 1122 is provided between two adjacent first arcuate surfaces 1121. Accordingly, as shown in FIG. 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 collecting pin 011 to have a relatively large number of first arcuate surfaces 1121, thereby improving the structural strength of the current collecting pin 011. Furthermore, the first arcuate surfaces 1121 are connected to the outer circumferential surface of the head portion 113, and the first arcuate surfaces 1121 are connected to the outer circumferential surface of the tail portion 115, thereby improving the connection strength between the middle portion 114 and the head portion 113, and between the middle portion 114 and the tail portion 115.

[0052] Referring to Figure 4, in one embodiment, at least a portion of the outer peripheral surface of the main body 111 is a spiral surface, and the spiral surface is a fourth arc surface 1124, which is convexly provided away from the axis of the current collecting pin 011, and both sides of the fourth arc surface 1124 are smoothly connected to the adjacent third arc surface 1123.

[0053] As can be understood, a portion of the outer circumferential surface of the main body 111 may be a helical surface, or the entire outer circumferential surface of the main body 111 may be a helical surface. Specifically, a portion of the outer circumferential 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 the collector pins 011 and the adjacent tank walls more uniform, reducing the possibility of localized stress concentration, thereby improving the structural stability and durability of the collector pins 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,​​​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, thereby controlling the maximum outer diameter of the current collecting pin 011, and ultimately avoiding 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, thereby controlling the resistance when the current collecting pin 011 is inserted into the positive electrode, and ultimately improving the convenience of attaching 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 ultimately improving the resistance of the fourth arc surface 1124 to external pressure and impact force, and reducing the damage caused by collision during the processes such as transportation, storage, and assembly of the current collecting pin 011.

[0068] Here, the width of the horizontal cross section of the current collecting pin 011 is the distance along the radial direction of the current collecting pin 011 between the side of the third arcuate surface 1123 closer to the axis of the current collecting pin 011 and the side of the fourth arcuate surface 1124 farther from the axis of the current collecting pin 011. By controlling this width, the resistance force exerted when the current collecting pin 011 is inserted into the positive electrode can be controlled, thereby improving assembly efficiency.

[0069] Referring to Figure 4, in one embodiment, when a cross section is taken along a plane on the axis of the current collecting pin 011, the arc degree of the third arc surface 1123 is π, the arc degree of the fourth arc surface 1124 is π, and the third arc surface 1123 is tangent to the adjacent fourth arc surface 1124.

[0070] In this embodiment, the above-mentioned arrangement simplifies the surface structure of the current collecting pin 011 and controls the number of curved surfaces smoothly connected between the third arc surface 1123 and the fourth arc surface 1124, thereby reducing the manufacturing complexity of the current collecting pin 011. Meanwhile, by making the third arc surface 1123 contact the fourth arc surface 1124, the surface of the current collecting pin 011 can be prevented from having a relatively large number of transition structures, which can reduce stress concentration and ultimately improve the stress state of the current collecting pin 011.

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

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

[0073] In this embodiment, the hollow structure 1111 is provided in the body 111, thereby reducing the thickness of the body 111 and allowing the body 111 to have a relatively large elasticity, and particularly when the body 111 has a thin-walled structure, the elasticity of the body 111 can be increased. This increases the contact pressure between the current collecting pin 011 and the positive electrode, improving the reliability of the contact between the current collecting pin 011 and the positive electrode and contributing to improving the current collecting effect of the current collecting pin 011.

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

[0075] 1 and 5, Fig. 5 is an enlarged view of part C in Fig. 1 provided in an embodiment of the present application. In one embodiment, an upper end through-hole 1112 and a lower end through-hole 1113 communicating with the inside of the body 111 are provided at both ends of the body 111, respectively.

[0076] In this embodiment, with the above-mentioned arrangement, when the battery is assembled and the electrolyte is injected, part of the electrolyte flows into the hollow structure 1111 through the upper through-hole 1112 and is discharged to the positive electrode through the lower through-hole 1113, thereby improving the impregnation efficiency of the battery.

[0077] Referring to FIG. 5, in one embodiment, the body 111 has a leading end and a trailing end at both ends, the leading end being configured to be connected to the pole 013 of the battery, the body 111 having a variable diameter portion 1114 located at the end, and the outer diameter of the variable diameter portion 1114 gradually decreasing in the direction away from the leading end.

[0078] As can be seen, when assembling a battery, the current collecting pin 011 is inserted into the positive electrode after the negative electrode, bottom film, edge film, positive electrode, and top film are placed in the housing 1. In this embodiment, by providing a diameter-changing portion 1114 at the end away from the tip of the current collecting pin 011, the resistance force when the current collecting pin 011 is inserted into the positive electrode can be reduced, the stress state of the current collecting pin 011 can be improved, and assembly efficiency can be increased.

[0079] Furthermore, a bottom through hole 1113 is provided on the end face of the terminal end.

[0080] Referring to FIG. 5, in one embodiment, the body 111 has a chamfer 1115 between its outer periphery and the distal end face.

[0081] Illustratively, the chamfer 1115 is a rounded chamfer 1115 .

[0082] In this embodiment, the above-described arrangement can reduce the resistance force when the current collecting pin 011 is inserted into the positive electrode, while improving the stress state at the end of the current collecting pin 011, thereby improving the structural stability and durability of the current collecting pin 011.

[0083] In one embodiment, the outer surface of the body 111 and / or the inner wall of the groove 112 are provided with a conductive layer, which may be one or more of a nickel-plated layer, a gold-plated layer, and a carbon-coated layer.

[0084] As can be seen, a conductive layer is provided on the outer surface of the main body 111, or a conductive layer is provided on the inner wall of the groove body 112, or a conductive layer is provided on both the outer surface of the main body 111 and the inner wall of the groove body 112.

[0085] In this embodiment, the above-described arrangement can improve the electrical conductivity of the current collecting pins 011, thereby improving the current collecting effect of the current collecting pins 011.

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

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

[0088] As can be seen, the head portion 113 is used to connect the pole of the battery, and the tail portion 115 faces the bottom of the battery and serves as a guide to insert the positive pole into the terminal 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. Thus, 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. An attachment hole 121 is provided in the cover 012. The terminal post 013 penetrates through the attachment hole 121 and is connected to the cover 012 via an insulating sealing member 014. One end of the main body 111 is connected to the terminal post 013.

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

[0096] Furthermore, the pole 013 may be directly welded to the collector pin 011, or both the pole 013 and the collector 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, it is possible to control the space occupied by the current collector pin 011 inside the battery and to increase the outer surface area of ​​the current collector pin 011, thereby increasing the contact area between the current collector pin 011 and the positive electrode and thus increasing the current collection area of ​​the current collector pin 011. Therefore, the discharge current of a lithium thionyl chloride battery using this cover assembly 001 can be made relatively large, thereby expanding the range of applications of the lithium thionyl chloride battery.

[0098] Referring to Fig. 7, Fig. 7 is a schematic diagram showing the structure of another cover assembly 001 provided in an embodiment 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 the electrode post 013 and / or the current collecting pin 011 and fastened to the electrode post 013. The positioning bracket 015 has an abutment portion 151, which is configured to abut against the positive electrode of the lithium thionyl chloride battery.

[0099] Here, the positioning bracket 015 is fitted to the pole 013 or the current collecting pin 011 , or the positioning bracket 015 is partly fitted to the pole 013 and the other part is fitted to the current collecting pin 011 .

[0100] As can be seen, the positive electrode expands when immersed in the electrolyte, and also expands during the discharge process. If the expanded height of the positive electrode exceeds the height of the negative electrode 024, the current collection effect decreases, leading to discharge failure, and current flows from the positive electrode to the negative electrode 024, causing the battery to short circuit.

[0101] As described above, in this embodiment, by providing the positioning bracket 015, if the positive electrode expands, the position of the expanded positive electrode is limited, thereby ensuring the current collection effect and ultimately improving the consistency between the designed discharge capacity of the battery and the actual discharge capacity.

[0102] Referring to Fig. 8, Fig. 8 is an enlarged view of portion D of Fig. 7 provided in an embodiment of the present application. In one embodiment, the positioning bracket 015 includes a sleeve connection portion 152 and an abutment portion 151, the sleeve connection portion 152 is fitted onto the electrode post 013 / current collecting pin 011 and fastened to the electrode post 013, and the end of the sleeve connection portion 152 remote from the cover 012 is connected to the abutment portion 151. The abutment portion 151 is provided extending from the sleeve connection portion 152 in a direction away from the axis of the current collecting pin 011.

[0103] 9 and 10, Fig. 9 is a schematic diagram showing the structure of another cover assembly 001 provided in an embodiment of the present application, and Fig. 10 is an enlarged view of part F in Fig. 9. In one embodiment, the positioning bracket 015 is a conductor, and the abutting 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, and the contact portion 1513 is configured to come into contact with the positive electrode of the lithium thionyl chloride battery.

[0104] As can be appreciated, the contact portion 1513 may be provided at any position on the main body 1512, for example, at an end of the main body 1512 closer to the sleeve connection portion 152 or at an end of the main body 1512 farther from the sleeve connection portion 152.

[0105] Here, an upper cover film is provided on the upper end of the positive electrode, and 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 can pass through the upper cover film and come into contact with the positive electrode.

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

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

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

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

[0110] As can be seen, the lithium thionyl chloride battery is composed of, from the current collecting pin 011 outward, the positive electrode, the edge film 023, the negative electrode 024, and the housing 021. To increase the positional limit of the expansion 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 periphery of the contact portion 151 faces the edge film 023. If the outer periphery of the contact portion 151 were directly opposed to the edge film 023, the corners of the outer periphery 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 corners of the abutment portion 151 and the edge film 023 is avoided, thereby preventing the edge film 023 from being damaged by the abutment portion 151, and ultimately improving the reliability of the battery.

[0112] 8, which is an enlarged view of part D in FIG. 7 provided in an embodiment of the present application. In one embodiment, a first through hole 1511 is provided in the abutting portion 151, and the first through hole 1511 is used for the circulation of the electrolyte.

[0113] For example, there are a plurality of first through holes 1511, and the plurality of first through holes 1511 are distributed along the circumferential direction and the radial direction of the abutting portion 151.

[0114] In this embodiment, with the above-described arrangement, when the battery is assembled 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 FIG. 8, in one embodiment, the pole 013 has a shaft shoulder 131, the large diameter portion of the pole 013 is located on the side of the shaft shoulder 131 away from the positioning bracket 015, and the positioning bracket 015 abuts against the shaft shoulder 131.

[0116] In this embodiment, by providing a shaft shoulder 131, the positioning bracket 015 abuts against the shaft shoulder 131, thereby realizing a stop cooperation between the positioning bracket 015 and the pole 013, thereby improving the positional stability of the positioning bracket 015 and ensuring that the positioning bracket 015 is stable in a position that limits the position against expansion of the positive electrode.

[0117] In addition to the structure of the positioning bracket 015 provided in the embodiment of the present application described above, the embodiment of the present application further provides other structures of the positioning bracket 015 in the following embodiments. Referring to FIG. 12 or FIG. 13, FIG. 12 is a schematic diagram showing the structure of another positioning bracket 015 in the cover assembly 001 provided in the embodiment of the present application, and FIG. 13 is a schematic diagram showing the structure of another positioning bracket 015 in the cover assembly 001 provided in the embodiment of the present application. In the embodiment 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 is configured to limit the position of the positive electrode of the lithium thionyl chloride battery against expansion. The abutting member 052 is provided on the side of the position limiting plate 051 away from the positive electrode, and is configured to abut against the inner wall of the casing of the thionyl chloride lithium battery or the electrode post of the thionyl chloride lithium battery along the radial direction of the alignment hole 111a. The first insulating member 053 is provided on the abutting member 052, and is configured to insulate and isolate the abutting member 052 from the component that abuts against it. The current collecting pin 011 is provided through the alignment hole 111a.

[0118] As can be seen, when the abutting member 052 abuts against the inner wall of the housing of the lithium-thionyl chloride battery along the radial direction of the alignment hole 111a as shown in Fig. 12, the first insulating member 053 is located on the side of the abutting member 052 that is closer to the inner wall of the housing. When the abutting member 052 abuts against the pole along the radial direction of the alignment hole 111a as shown in Fig. 13, the first insulating member 053 is located on the side of the abutting member 052 that is closer to the pole.

[0119] Typically, some thionyl chloride lithium batteries collect current using collector pins or rods, which are coaxially connected to the poles. Other thionyl chloride lithium batteries collect current using collector tubes, which are connected to the poles by electrode tabs. Therefore, to avoid interference between the positioning bracket 015 and the electrode tabs, the positioning bracket 015 abutting the poles as disclosed in the examples of this application is primarily applicable to lithium thionyl chloride batteries that collect current using collector pins or rods. The positioning bracket 015 abutting the inner wall of the casing of a thionyl chloride lithium battery as disclosed in the examples of this application may be applied to lithium thionyl chloride batteries that collect current using collector pins or rods, or may be applied to lithium thionyl chloride batteries that collect current using collector tubes.

[0120] Here, the first insulating member 053 may be adhered to the abutting member 052, or may be molded into the abutting member 052 by an injection molding process. The position limiting plate 051 and the abutting member 052 may be integrally molded, or may be connected and integrated by welding. The materials of the position limiting plate 051 and the abutting member 052 may be, but are not limited to, stainless steel, pure nickel, nickel-plated stainless steel, nickel-plated cold-rolled carbon steel, etc. 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 part that is in contact with the contact member 052 is smaller than the force that pushes the positioning bracket 015 after the positive electrode has absorbed the liquid and expanded. Therefore, when the electrolyte is injected, the positive electrode comes into contact with the positioning bracket 015 after absorbing the liquid and expanding, and can push the positioning bracket 015 to move.

[0122] In this embodiment, by applying this positioning bracket 015 to a lithium thionyl chloride battery, after the positive electrode absorbs liquid and expands to the point where it exerts 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 positive electrode has completely absorbed and expanded. At this time, the position of the positioning bracket 015 coincides with the height of the positive electrode after it has completely absorbed and expanded. This allows the position of the positioning bracket 015 to be adaptively adjusted based on the height to which the positive electrode has absorbed and expanded, thereby matching the position of the positioning bracket 015 to the height to which the positive electrode has absorbed and expanded. This prevents the positioning bracket 015 from being damaged by the relatively large upward pushing force exerted by the positive electrode and also prevents discharge defects of the lithium thionyl chloride battery due to the presence of a gap between the positive electrode and the positioning bracket 015.

[0123] Furthermore, by abutting the positioning bracket 015 against the electrode post or the inner wall of the housing, the positive electrode can be prevented from expanding excessively due to liquid absorption, and the agreement between the discharge capacity and the actual discharge amount of the thionyl chloride lithium battery can be improved.

[0124] 12, in one embodiment, when the abutting member 052 abuts against the inner wall of the housing along the radial direction of the alignment hole 111a, the abutting 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 abutting member 052 that is closer to the inner wall of the housing.

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

[0126] 12, in one embodiment, the abutting member 052 has a cylindrical structure. One end of the abutting member 052 is connected to the periphery of the position limiting plate 051. The outer wall of the abutting 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 abutting member 052 is provided coaxially with the pole.

[0128] In this embodiment, by making the abutment member 052 cylindrical, the abutment surface between the positioning bracket 015 and the lithium thionyl chloride battery is increased and the abutment surface is made more symmetrical, thereby improving the stress state of the positioning bracket 015 and the housing of the lithium thionyl chloride battery, preventing excessive stress concentration, and ultimately improving reliability.

[0129] Referring to FIG. 12, in one embodiment, the first insulating member 053 extends to the end of the abutting member 052 that is remote from the position limiting plate 051 .

[0130] As can be seen, when a lithium thionyl chloride battery is discharged at high temperature, the positive electrode expands to a relatively large extent, pushing upward the positioning bracket 015. On the other hand, if the positioning bracket 015 moves upward too far, there is a risk of short circuit due to contact with the cover.

[0131] As described above, in this embodiment, the above-described arrangement allows the positioning bracket 015 to be insulated and isolated from the cover when it is pushed upward by the expanded positive electrode toward the cover, thereby improving reliability and contributing to 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, the first insulating member 053 is an elastic insulating member, so that when the positive electrode expands and pushes the positioning bracket 015 upward, causing the positioning bracket 015 to abut against the cover, the first insulating member 053 is compressed. On the other hand, when the positive electrode of the thionyl chloride lithium battery contracts, the deformation recovery force of the first insulating member 053 pushes the positioning bracket 015 downward, causing the positioning bracket 015 to return to its original position and maintain its positional restriction function for the positive electrode. This improves the matching between the position of the positioning bracket 015 and the height of the positive electrode, improving the consistency between the discharge capacity of the thionyl chloride lithium battery and the actual discharge amount, and ultimately improving the reliability of the thionyl chloride lithium battery.

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

[0135] In this embodiment, by providing the convex portion 133, the deformation amount of the first insulating member 053 is increased, and the deformation recovery force of the first insulating member 053 after being pressed is increased, and it is therefore possible to ensure that the deformation recovery force of the first insulating member 053 can press the positioning bracket 015 downward to a position that matches the height of the positive electrode.

[0136] Referring to FIG. 14, in one embodiment, the protrusion 133 extends circumferentially around the alignment hole 111a to form a ring-shaped structure, or there are multiple protrusions 133, and the multiple protrusions 133 are spaced apart circumferentially around the alignment hole 111a.

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

[0138] 12, in one embodiment, the abutting 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. A second curved edge portion 123 is provided at the other end of the cylindrical portion 121a. The outer periphery 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 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. A first insulating member 053 is provided on the outer wall of the ring portion 122a.

[0139] For example, the ring portion 122a, the cylindrical portion 121a, the second curved edge portion 123, and the position limiting plate 051 are integrally formed, 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 reducing the manufacturing costs of the lithium thionyl chloride battery.

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

[0142] Since the first insulating member 053 and the abutting member 052 are made of different materials, the bond strength between them is relatively weak, and the end of the first insulating member 053 near the alignment hole 111 a is likely to come off the abutting member 052 .

[0143] As a result, in this embodiment, the above-described arrangement increases the connection strength between the first insulating member 053 and the abutting member 052, thereby improving the connection reliability between the first insulating member 053 and the abutting member 052.

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

[0145] Here, the first insulating member 053 and the second insulating member 054 may be 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 mold. Next, the cavity of the mold is filled with injection fluid, and when the injection fluid solidifies, the positioning bracket 015 to which the first insulating member 053 and the second insulating member 054 are attached is formed.

[0146] In this embodiment, due to the above-described arrangement, when the end of the first insulating member 053 close to the alignment hole 111a is separated from the abutting member, the second insulating member 054 provides a pulling force against the separation of the first insulating member 053, restricting the first insulating member 053 from separating from the abutting member, thereby improving the reliability of the connection between the first insulating member 053 and the abutting member.

[0147] Referring to FIG. 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 between the first insulating member 053 and the ring portion 122a, improving the reliability of the connection between the ring portion 122a and the first insulating member 053 and preventing them from coming apart from each other.

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

[0150] Here, in the longitudinal cross section of the cylindrical portion 121a, the included 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 allows the positioning bracket 015 to be integrally connected to 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. This avoids interference between the cylindrical portion 121a and the edge film, while increasing the distance between the positioning bracket 015 and the negative electrode. This improves the reliability of the lithium thionyl chloride battery.

[0152] 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 abutment member 052. The second curved portion 112a is fitted onto the current collecting pin 011.

[0153] Here, the connecting portion between the second curved portion 112a and the position limiting plate 051 is chamfered, specifically, rounded.

[0154] As can be understood, there are other components between certain thionyl chloride lithium batteries, and in this embodiment, by providing the second curved portion 112a, the positioning bracket can be brought into contact with the other components by the second curved portion 112a during the installation process, thereby preventing the end of the alignment hole 111a from scratching the other components.

[0155] Furthermore, by providing a chamfer at the connection portion between the second curved portion 112a and the position limiting plate 051, the attachment of the positioning bracket 015 can be guided, and it is possible to prevent other components from being damaged when the positioning bracket 015 is attached.

[0156] 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 provided at a position close to the position limiting plate 051.

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

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

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

[0160] In this embodiment, the above-described arrangement allows the positioning bracket 015 to be attached to other components via the cylindrical surface 1121a after assembly, thereby increasing the contact area between the positioning bracket 015 and other components, thereby improving the stress conditions of the other components and preventing localized stress concentration, thereby improving the reliability of the lithium-thionyl chloride battery.

[0161] Referring to FIG. 14, in one embodiment, the outer peripheral surface of the first insulating member 053 is chamfered at an end close to the position limiting plate 051, and specifically, is rounded.

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

[0163] 13, in one embodiment, when the abutting member 052 is configured to abut against the pole along the radial direction of the alignment hole 111a, the abutting 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 abutting member 052 that is closer to the pole.

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

[0165] Referring to FIG. 13, in one embodiment, the abutment member 052 has a cylindrical structure, one end of the abutment member 052 is connected to the periphery of the alignment hole 111a, the abutment member 052 is configured to be fitted onto the pole, and the inner wall of the abutment member 052 is configured to abut against the pole along the radial direction of the alignment hole 111a.

[0166] In this embodiment, by making the abutment member 052 cylindrical, the abutment surface between the positioning bracket 015 and the lithium thionyl chloride battery is increased and the abutment surface is made more symmetrical, thereby improving the stress state of the positioning bracket 015 and the housing of the lithium thionyl chloride battery, preventing excessive stress concentration, and ultimately improving reliability.

[0167] Referring to FIG. 13, in one embodiment, the first insulating member 053 extends to the end of the abutting member 052 that is remote from the position limiting plate 051 .

[0168] As can be seen, when a lithium thionyl chloride battery is discharged at high temperature, the positive electrode expands to a relatively large extent, pushing upward the positioning bracket 015. On the other hand, if the positioning bracket 015 moves upward too far, there is a risk of short circuit due to contact with the cover.

[0169] As described above, in this embodiment, the above-described arrangement allows the positioning bracket 015 to be insulated and isolated from the cover when it is pushed upward by the expanded positive electrode toward the cover, thereby improving reliability and contributing to 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, the first insulating member 053 is an elastic insulating member, so that when the positive electrode expands and pushes the positioning bracket 015 upward, causing the positioning bracket 015 to abut against the cover, the first insulating member 053 is compressed. On the other hand, when the positive electrode of the thionyl chloride lithium battery contracts, the deformation recovery force of the first insulating member 053 pushes the positioning bracket 015 downward, causing the positioning bracket 015 to return to its original position and maintain its positional restriction function for the positive electrode. This improves the matching between the position of the positioning bracket 015 and the height of the positive electrode, improving the consistency between the discharge capacity of the thionyl chloride lithium battery and the actual discharge amount, and ultimately improving the reliability of the thionyl chloride lithium battery.

[0172] 16, which is a schematic diagram showing the structure of the 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 132 is disposed around the axis of the alignment hole 111a, and the base surface of the base 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, which increases the amount of deformation of the first insulating member 053 and thus increases the deformation recovery force of the first insulating member 053 after being pressed. This ensures that the deformation recovery force of the first insulating member 053 can press the positioning bracket 015 downward to a position that matches the height of the positive electrode.

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

[0176] Here, in the longitudinal section of the first insulating member 053, the included angle between the outer peripheral 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 aligns the deformation direction of the first insulating member 053 after it is pressed, improving the stress state after it is pressed by the first insulating member 053, and ultimately improving the reliability of the positioning bracket 015.

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

[0179] Since the first insulating member 053 and the abutting member 052 are made of different materials, the bond strength between them is relatively weak, and the first insulating member 053 is likely to come off the abutting member 052 .

[0180] As a result, in this embodiment, the above-described arrangement increases the connection strength between the first insulating member 053 and the abutting member 052, thereby improving the connection reliability between the first insulating member 053 and the abutting member 052.

[0181] Referring to Figure 16, in one embodiment, a first curved portion 113a is provided on the outer periphery 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 abutment member 052.

[0182] Here, the connecting portion between the first curved portion 113a and the position limiting plate 051 is chamfered.

[0183] As can be seen, an edge film is provided on the outside of the positive electrode of the lithium thionyl chloride battery, while in this embodiment, by providing the first curved portion 113a, during the installation process, the positioning bracket can be brought into contact with the edge film by the first curved portion 113a, thereby preventing the edge of the position limiting plate 051 from scratching the edge film.

[0184] In addition, by providing a chamfer at the connection portion between the first curved portion 113a and the position limiting plate 051, the attachment of the positioning bracket 015 can be guided, and it is possible to prevent the edge film from being scratched when the positioning bracket 015 is attached.

[0185] 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 multiple groups of third through holes 114a are arranged at equal intervals around the axial direction of the first axial hole, and each of the multiple groups of third through holes 114a includes multiple third through holes 114a that are arranged at intervals along the radial direction of the alignment hole 111a.

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

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

[0190] For example, the distance between the position limiting plate 051 and the positive electrode may be 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, or 1.5 mm, but is not limited thereto. The distance between the contact member 052 and the cover of the lithium thionyl chloride battery may be 2.5 mm to 15 mm, but is not limited thereto.

[0191] Here, when the positioning bracket 015 is assembled, 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 zero.

[0192] In this embodiment, the above limitations prevent the distance between the position limiting plate 051 and the positive electrode from being too large, which can result in a gap between the position limiting plate 051 and the positioning bracket 015 after the positive electrode has completely absorbed and expanded, thereby improving the discharge reliability of the thionyl chloride lithium battery. On the other hand, when the positive electrode has not completely absorbed and expanded, the positioning bracket 015 is prevented from coming into contact with the cover, improving the stress state of the cover.

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

[0194] Specifically, the pole pillar 013 has a shaft shoulder 131, and the small diameter step portion of the pole pillar 013 is located on the side of the shaft shoulder 131 closer to the main body 111, the small diameter step portion is inserted into the main body 111, and the end of the main body 111 abuts against the shaft shoulder 131.

[0195] As can be understood, the current collecting pin 011 is typically welded to the electrode post 013 using a collision welding process. Specifically, the electrode post 013 and the current collecting pin 011 are clamped together using a tool, and then their end faces are pressed together and welded together. However, in this process, it is necessary to secure a sufficient space on the electrode post 013 in advance for the tool to clamp them. As a result, the height dimension of the electrode post 013 becomes relatively large, and therefore, it occupies a relatively large space inside the battery.

[0196] As described above, in this embodiment, the electrode post 013 is inserted into the main body 111, and the two are fixed to each other by the insertion, and the current collecting pin 011 is directly welded to the electrode post 013 by laser welding, which eliminates the need to secure a space for a tool to clamp the electrode post 013 in advance. This reduces the height of the electrode post 013, thereby reducing the space it occupies inside the battery, which in turn allows for more electrolyte to be filled and improves the reliability of the battery.

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

[0198] As can be seen, after the battery is completely filled, the sealing nail 027 must be crimped into the filling hole 123 in the cover 012. When crimping, the cover 012 receives a relatively large impact force. Meanwhile, the electrode post 013 is fixed to the cover 012 only by the sealing insulating member. Therefore, when the sealing nail 027 is crimped, the sealing between the electrode post 013 and the cover 012 is adversely affected.

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

[0200] Furthermore, the cover 012 is formed by pressing a metal plate having a thickness of 1 mm. In related art, the mounting holes 121 are formed by directly pressing to form uniform diameter holes. At this time, it is necessary to form a higher mounting hole 121 to reduce the adverse effects of crimping the sealing nail 027. Typically, a mounting hole 121 having a height of 2 mm is formed. However, forming a 2 mm mounting hole 121 from a 1 mm thick cover 012 involves high process requirements and is difficult to form. In this embodiment, the above-described arrangement allows a mounting hole 121 having a height of 1.8 mm to be formed by pressing a 1 mm thick metal plate, resulting in a cover assembly 001 with better sealing performance, while also reducing the difficulty of forming and improving manufacturing efficiency.

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

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

[0203] As can be seen, 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 to between the annular boss 122 and the pole post 013.

[0204] Therefore, when the sealing nail 027 is pressed, the impact force that the cover 012 receives becomes relatively large, which adversely affects the sealing between the terminal post 013 and the cover 012 .

[0205] As described above, in this embodiment, by providing the annular boss 122, it is possible to reduce the influence on the sealing between the terminal post 013 and the cover 012 when the nail is pressed.

[0206] Referring to FIG. 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 closer to the current collecting pin 011, and the first annular groove 124 is provided opposite the annular boss 122.

[0207] As can be seen, the cover 012 is a pressed part, and therefore its middle portion needs to be pressed toward the inside of the battery to form the mounting hole 121 that cooperates with the terminal post 013. Meanwhile, in order to form the annular boss 122, the cover 012 needs to have more material at the annular boss 122. Also, increasing the thickness of the metal plate to directly form the cover 012 not only results in an increase in material, but also involves many process changes.

[0208] As described above, in this embodiment, during press forming, the position limiting structure in the mold prevents the material in the annular groove from moving downward, thereby forming the annular groove on the side of the cover 012 that is closer to the battery cell, and forming the annular boss 122 on the side of the cover 012 that is farther from the inside of the battery. In this way, the adverse effects on sealing caused by nail crimping are reduced, and a metal plate that does not need to be increased in thickness to form the cover 012 can be formed, thereby controlling related process changes and ultimately the manufacturing costs of the cover 012.

[0209] Referring to FIG. 6, in one embodiment, a boss 125 is provided on the cover 012 on the side closer to the current collecting pin 011, and the boss 125 is provided so as to extend along the circumferential direction of the mounting hole 121.

[0210] As can be understood, when the cover 012 is a pressed part, the boss 125 is formed by pressing.

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

[0212] 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. The battery includes a current collecting pin 011 as disclosed in some embodiments of the present application, or a cover assembly 001 as disclosed in some embodiments of the present application.

[0213] As can be seen, the battery further includes a housing 021, a bottom film 022 disposed inside the housing 021, an edge film 023, a negative electrode 024 disposed between the edge film 023 and the housing 021, a positive electrode 025 disposed inside the edge film 023, and an upper cover film 026 covering the top of the positive electrode. A cover 012 is disposed to cover an opening of the housing 021 and is sealingly connected to the opening of the housing 021. A current collecting pin 011 is inserted into the positive electrode. After the liquid injection is completed, a sealing nail 027 is used to seal and close the liquid injection hole 123 in the cover 012.

[0214] As shown in FIG. 18, FIG. 18 is an enlarged view of part G in FIG. 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 collecting pin 011 or the cover assembly 001 disclosed in some embodiments of the present application, it is possible to control the space occupied by the current collecting pin 011 inside the battery and to increase the area of ​​the outer surface of the current collecting pin 011, thereby increasing the contact area between the current collecting pin 011 and the positive electrode and thus increasing the current collecting area of ​​the current collecting pin 011. This increases the discharge current of the battery and expands the range of application of the battery.

[0216] Furthermore, when the positioning bracket 015 is disposed in the battery, there is a gap between the contact portion 151 and the positive electrode before the battery is filled with electrolyte, and this gap is optionally 1 to 4 mm, for example, the gap may be 2 mm. This gap provides a buffer space for expansion due to impregnation with electrolyte, improving the stress state of the positioning bracket 015, the electrode post 013, and the cover 012, and thereby improving the reliability of the battery.

[0217] 19, 20, and 21, FIG. 19 is a schematic diagram showing the structure of another battery 002 provided in an embodiment of the present application, FIG. 20 is a schematic diagram showing the structure of another battery 002 provided in an embodiment of the present application, and FIG. 21 is a schematic diagram showing the structure of another battery 002 provided in an embodiment of the present application. Accordingly, an embodiment of the present application further provides 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 receiving cavity. The cover 012 covers the housing 021. The poles 013 penetrate the cover 012. The cell pack is provided in the receiving 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, which are arranged in this order from the center of the housing 021 to the outside. The bottom film 022 is arranged on the bottom wall of the housing cavity. The upper cover film 026 is arranged on the end of the positive electrode 025 away from the bottom film 022. Here, a position limiting plate 051 is arranged facing the positive electrode 025. The abutting member 052 abuts against the electrode post or the inner wall of the housing 021 along the radial direction of the alignment hole 111a. The first insulating member 053 insulates and isolates the abutting member 052 from the component abutting against the abutting member 052, and the positioning bracket 015 is arranged at a distance from the cover 012.

[0218] As can be understood, when assembled, the position limiting plate 051 may abut against the positive electrode 025, or may leave a certain gap. 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 an electrolyte is injected into the battery 002 to cause the positive electrode 025 to absorb the electrolyte and expand, the expanded positive electrode 025 can push and move the positioning bracket 015, thereby adaptively adjusting the position of the positioning bracket 015 based on the expansion height of the positive electrode 025 due to the absorption of electrolyte, and thus the position of the positioning bracket 015 after the impregnation of the battery 002 is completed can be matched with the expansion height of the positive electrode 025. This prevents the positioning bracket 015 from being damaged by the relatively large upward pushing force of the positive electrode 025, and also prevents poor discharge of the battery 002 due to a gap between the positive electrode 025 and the positioning bracket 015, thereby improving the reliability of the battery 002. [Explanation of symbols]

[0220] 001: Cover assembly 011: Current collecting pin 111:Main body 112:Groove body 1121: First circular arc surface 1122: Second arc surface 1123: Third arc surface 1124: 4th arc surface 1111:Hollow structure 1112: Top through hole 1113: Bottom through hole 1114: Variable diameter section 1115: Chamfering 113: Head 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 part 152: Sleeve connection part 153: Positioning ring 002:Battery 021: Cabinet 022: Bottom film 023: Edge film 024: Negative electrode 025: Positive electrode 026: Upper cover film 027: Sealing nail 015: Positioning bracket 051: Position restriction plate 111a: Alignment hole 112a: second curved portion 1121a: Cylindrical surface 113a: First curved section 114a: 3rd through hole 052: Contact member 121a: Cylinder part 122a: Ring section 123: Second curled edge 1231: Second through hole 124: First curled edge 053: First insulating member 133: Convex 132: Stand 054: Second insulating member

Claims

1. The device includes a main body (111), and a groove (112) is provided on the outer circumferential surface of the main body (111). Current collecting pin (011).

2. The groove (112) is provided to extend along the circumferential direction of the main body (111). A current collector pin (011) according to claim 1.

3. The groove body (112) is an annular groove, and the axis of the annular groove is parallel to the axis of the current collecting pin (011). A current collecting pin (011) according to claim 2.

4. The annular groove is provided in a plurality of grooves, and the plurality of annular grooves are provided in order along the extension direction of the axis of the current collecting pin (011). A current collector pin (011) according to claim 3.

5. 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 provided in a convex shape away from the axis of the current collecting pin (011), and both sides of the first arcuate surface (1121) are smoothly connected to the groove walls of the adjacent annular grooves, respectively. A current collector pin (011) according to claim 4.

6. 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 collecting pin (011), and both sides of the second arcuate surface (1122) are smoothly connected to the adjacent first arcuate surfaces (1121). A current collector pin (011) according to claim 5.

7. The maximum outer diameter of the main body (111) is D, the radius of the first arcuate surface (1121) is R1, and the radius of the second arcuate 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; A current collector pin (011) according to claim 6.

8. The cross section is a plane on which the axis of the current collecting pin (011) is located, and the arc degree of the first arc surface (1121) is π, the arc degree of the second arc surface (1122) is π, and the first arc surface (1121) is in contact with the adjacent second arc surface (1122). A current collector pin (011) according to claim 6.

9. The number of the first arcuate surfaces (1121) is m, the number of the second arcuate surfaces (1122) is n, and m=n+1 is satisfied, where m and n are both natural numbers greater than 0. A current collector pin (011) according to claim 6.

10. The groove body (112) is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting pin (011). A current collecting pin (011) according to claim 2.

11. The bottom wall of the spiral groove is a third arcuate surface (1123), which is recessed at a position close to the axis of the current collecting pin (011), and both sides of the third arcuate surface (1123) are smoothly connected to the outer circumferential surface of the main body (111). A current collector pin (011) according to claim 10.

12. At least a part of the outer peripheral surface of the main body (111) is a helical surface, and the helical surface is a fourth arcuate surface (1124), which is provided in a convex shape away from the axis of the current collecting pin (011), and both sides of the fourth arcuate surface (1124) are smoothly connected to the adjacent third arcuate surfaces (1123). A current collector pin (011) according to claim 11.

13. The maximum outer diameter of the main body (111) is D, the radius of the third arcuate surface (1123) is R3, and the radius of the fourth arcuate surface (1124) is R4, wherein 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; A current collector pin (011) according to claim 12.

14. The cross section is a plane on which the axis of the current collecting pin (011) is located, and the arc degree of the third arc surface (1123) is π, and the arc degree of the fourth arc surface (1124) is π, and the third arc surface (1123) is in contact with the adjacent fourth arc surface (1124). A current collector pin (011) according to claim 12.

15. The main body (111) has a hollow structure (1111) with a uniform wall thickness, and an upper end through-hole (1112) and a lower end through-hole (1113) are provided at both ends of the main body (111), respectively, which are connected to the inside of the main body (111). A current collector pin (011) according to claim 1.

16. The body (111) has a tip and a tail at both ends, and the tip is configured to be connected to a pole (013) of a battery (002). The body (111) has a diameter-changing portion (1114) located at the tail, and the outer diameter of the diameter-changing portion (1114) gradually decreases along the direction away from the tip. A chamfer (1115) is provided between the outer circumferential surface of the body (111) and the end face of the tail. A current collector pin (011) according to claim 1.

17. a conductive layer is provided on the outer circumferential surface of the main body (111) and / or the inner wall of the groove body (112), and the conductive layer is one or more of a nickel-plated layer, a gold-plated layer, and a carbon coating layer; A current collector pin (011) according to claim 1.

18. Along the axial direction of the current collecting pin (011), the main body (111) includes a head portion (113), a middle portion (114) and a tail portion (115) connected in this order, the groove (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 is satisfied. A current collector pin (011) according to claim 1.

19. a cover (012) provided with mounting holes (121); a pole (013) that penetrates the mounting hole (121) and is connected to the cover (012) by an insulating sealing member (014); and a current collecting pin (011) according to claim 1, wherein one end of the body (111) is connected to the pole (013). Cover assembly (001).

20. 20. A cover assembly (001) according to claim 19, Battery (002).

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