Battery top cover and secondary battery

Abstract

A battery top cover and a secondary battery, the battery top cover comprising a cover plate with a pole post hole and a mounting hole formed therethrough, a pole post assembly assembled on the pole post hole, and a liquid injection mechanism assembled in the mounting hole, the liquid injection mechanism comprising a barrel, a barrel rim formed upwardly from the barrel edge, and a liquid injection hole formed through the liquid injection mechanism, the barrel rim having an outer diameter adapted to the mounting hole and being inserted into the mounting hole, and the barrel rim being welded at the joint with the mounting hole to fix and seal the liquid injection mechanism and the cover plate together. The application can effectively solve the problem that it is difficult to process the liquid injection hole structure for hard thin plate materials.

Description

Technical Field

[0001] This utility model relates to the field of rechargeable batteries, and more particularly to a battery top cover and a secondary battery. Background Technology

[0002] Secondary batteries are widely used in daily life as energy storage carriers or to provide power to electrical devices such as electric vehicles and energy storage projects. A secondary battery generally includes a metal casing, battery cells encapsulated within the casing, electrolyte, and a battery top cover that seals the casing and leads out the electrodes. The battery top cover has various structural forms and meets requirements for sealing and explosion-proof performance. The battery top cover typically integrates terminal components for transmitting electrical energy, electrolyte injection holes, and explosion-proof components.

[0003] Traditional battery top covers are typically made of aluminum alloy, a material easy to machine. For example, patent application CN109786592A discloses a battery top cover where the electrolyte injection holes are machined into a suitable shape on the cover to achieve the injection function. However, with increasingly stringent safety requirements, aluminum alloy's low melting point means that in the event of a fire, it can quickly burn through the entire battery casing, leading to a rapid loss of fire control. The industry has begun using harder materials with higher melting points, such as stainless steel and titanium alloy, for the cover and casing to prolong the time before a fire becomes uncontrollable, providing time for evacuation. However, using stainless steel or titanium alloy results in higher strength, requiring thinner sheet metal compared to aluminum alloy to reduce weight, and is more difficult to machine, making the traditional method of machining the electrolyte injection holes on the sheet metal impractical. Utility Model Content

[0004] Therefore, it is necessary to provide a battery top cover and a secondary battery that can easily achieve liquid filling function on a stainless steel or titanium alloy casing.

[0005] To address the aforementioned technical problems, this application provides a battery top cover, comprising a cover plate through which terminal holes and mounting holes are formed, a terminal assembly assembled on the terminal holes, and a liquid injection mechanism assembled within the mounting holes. The liquid injection mechanism includes a cylindrical body, a cylindrical edge extending upward from the edge of the cylindrical body, and a liquid injection hole penetrating the liquid injection mechanism. The outer diameter of the cylindrical edge is adapted to the mounting hole and inserted into the mounting hole. The junction of the cylindrical edge and the mounting hole is welded to fix and seal the liquid injection mechanism and the cover plate together.

[0006] Preferably, the top surface of the cylinder edge is flush with the outer surface of the cover plate, and a first sealing weld ring is formed by welding the cylinder edge and the cover plate together at the mounting hole from the outside.

[0007] Preferably, the bottom surface of the cylinder edge is flush with the inner surface of the cover plate, and a second sealing welding ring is formed by welding the cylinder edge and the cover plate together at the mounting hole from the inside.

[0008] Preferably, the cylinder has a support wing that protrudes radially outward along its lower side, and the support wing is supported on the inner side of the cover plate.

[0009] Preferably, the inner edge of the mounting hole of the cover plate is recessed upward to form a locking groove, the support wing is inserted into the locking groove and the bottom surface of the support wing is flush with the bottom surface of the cover plate, and a second sealing welding ring is welded at the junction of the support wing and the periphery of the locking groove.

[0010] Preferably, the supporting wing is supported on the inner surface of the cover plate, the bottom surface of the supporting wing is lower than the inner surface of the cover plate, the battery top cover also includes a lower plastic attached to the inner surface of the cover plate, the lower plastic is provided with a liquid injection buffer groove corresponding to the mounting hole position, the cylinder is located in the liquid injection buffer groove, and the periphery of the liquid injection buffer groove is provided with a recess to accommodate the supporting wing.

[0011] Preferably, the cylinder has a recessed center forming a sinkhole that connects to the injection hole. The cylinder has a semi-conical structure and includes an inclined outer surface. The sinkhole has an inclined inner surface formed on its radial outer wall, and the inclination of the inner surface is greater than that of the outer surface.

[0012] Preferably, the injection mechanism and the cover plate are made of the same metal material, which is stainless steel or titanium alloy.

[0013] Preferably, the pole assembly includes an upper plastic attached to the outer surface of the cover plate, a riveting block housed within the upper plastic, a pole, and a sealing ring fitted around the pole. A lower plastic is also attached to the inner surface of the cover plate. The pole comprises, from bottom to top, a first pole, a second pole, and a third pole with gradually decreasing outer diameters. The sealing ring includes a sealing ring body attached to the upper surface of the first pole, a through hole penetrating the sealing ring body, and an inner ring body extending upwards from the periphery of the through hole. The outer edge of the first pole is supported and confined on the lower plastic. The sealing ring body is clamped between the bottom surface of the cover plate and the upper surface of the first pole. The inner ring body isolates the outer peripheral surface of the second pole from the inner wall surface of the pole hole. The riveting block has a through-hole. The third pole passes through the through-hole and is stretched radially outwards by compression, deforming the third pole and fixing it within the through-hole.

[0014] Preferably, the rivet block around the rivet hole is provided with a first concave ring and a second concave ring with increasing inner diameter from bottom to top. The upper surface of the third column does not exceed the upper surface of the rivet block. After the third column is deformed, it is snapped onto the upper surface of the first concave ring to fix the pole post and the rivet block together.

[0015] Preferably, the outer surface of the cover plate has a pair of first anti-rotation recesses with lines passing through the center of the pole hole on the outer periphery of the pole hole, the bottom of the upper plastic has a first anti-rotation protrusion that fits into the first anti-rotation recess, the inner surface of the cover plate has a pair of second anti-rotation recesses with lines passing through the center of the pole hole on the outer periphery of the pole hole, and the upper side of the lower plastic has a corresponding position with a second anti-rotation protrusion that fits into the second anti-rotation recess, and the line connecting the first anti-rotation recesses and the line connecting the second anti-rotation recesses are perpendicular to each other.

[0016] Preferably, the battery top cover further includes a current collector, which is L-shaped. The outer edge of the bottom of the first column is cut off to form an edge groove. The current collector includes a terminal connecting end connected to the first column, a cell connecting end formed by bending from the terminal connecting end and passing through the terminal connecting end, a mating hole, and a mating groove formed by recessing on the periphery of the mating hole. The portion of the third column located at the edge groove is inserted into the mating hole, and the edge of the third column is inserted into the edge groove. The third column and the current collector are welded together at the joint.

[0017] To address the aforementioned technical problems, this application also provides a secondary battery, comprising a battery casing, a battery cell encapsulated within the battery casing, and the aforementioned battery top cover, wherein the battery top cover seals the battery casing and is electrically connected to the battery cell.

[0018] To address the difficulty in machining injection holes on the cover plate caused by the hardening and thinning of the cover plate material, the battery top cover and secondary battery of this application solve the problem. Simple mounting holes are directly punched on the cover plate, and then an independently set injection mechanism is installed and welded into the mounting holes. The independent injection mechanism can be obtained by batch stamping or other processing methods using thicker plates. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] Example 1 Figure 1 This is a three-dimensional assembly diagram of the battery top cover in Example 1.

[0021] Figure 2 This is an exploded perspective view of the battery top cover in Example 1.

[0022] Figure 3 For along Figure 1 The cross-sectional view shown by the dashed line BB.

[0023] Figure 4 for Figure 3 A magnified view of a portion of the dashed circle shown.

[0024] Figure 5 For along Figure 2 The cross-sectional view shown by the dashed CC line.

[0025] Figure 6 This is a perspective view of the liquid injection mechanism of the battery top cover in Embodiment 1.

[0026] Figure 7 This is a cross-sectional view of the injection mechanism in Example 1.

[0027] Figure 8 For along Figure 1 The cross-sectional view shown by the dashed line AA.

[0028] Example 2 Figure 9 Example 2 along Figure 1 The cross-sectional view shown by the dashed line AA.

[0029] Example 3 Figure 10 Example 3 along Figure 1 The cross-sectional view shown by the dashed line AA.

[0030] Example 4 Figure 11 Example 4 along Figure 1 The cross-sectional view shown by the dashed line AA.

[0031] Explanation of reference numerals in the attached figures Cover plate-10; Mounting hole-11; Engaging groove-111; Pole post hole-12; Ring groove-121; First anti-rotation recessed hole-13; Pole post assembly-20; Riveting block-21; Riveting hole-211; First recessed ring-212; Second recessed ring-213; Upper plastic-22; Perforation-221; Isolation plate body-222; Outer wall-223; Lower extension ring body-224; Sealing ring-23; Sealing ring body-231; Inner ring body-232; Through hole-233; Pole post-24; First post-241; Edge groove-2 411; Second column - 242; Third column - 243; Current collector - 25; Terminal connection end - 251; Cell connection end - 252; Mating hole - 253; Mating groove - 254; Liquid injection mechanism - 30; Cylinder - 31; Outer bevel - 311; Cylinder edge - 32; Exposed protrusion - 321; Support wing - 322; Submerged hole - 33; Inner bevel - 331; Liquid injection hole - 34; Explosion-proof plate - 40; Lower plastic - 50; Liquid injection buffer groove - 51; Through hole - 52; Second anti-rotation protrusion - 53; Submerged groove - 54. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings.

[0033] Please see Figure 1 As shown, the top cover of the battery is made of Figure 1 The X direction is the horizontal direction, the Y direction is the vertical direction, and the Z direction is the vertical direction above.

[0034] Please see Figures 1 to 5 As shown, the battery top cover of this application includes a cover plate 10, a lower plastic 50 attached to the inner surface of the cover plate 10, an electrode assembly 20 mounted on the cover plate 10, an explosion-proof sheet 40 assembled on the cover plate 10, and a liquid injection mechanism 30.

[0035] The cover plate 10 is made of stainless steel or titanium alloy and is relatively thin. A through hole 12 for mounting the electrode assembly 20 and a mounting hole 11 for mounting the injection mechanism 30 are formed on the cover plate 10. The cover plate 10 also has an explosion-proof hole (not shown), at which an explosion-proof plate 40 is welded to achieve explosion-proof pressure relief. A downward-pressed annular groove 121 is formed on the outer periphery of the electrode hole 12, the height of which does not exceed half the thickness of the cover plate. An upward-pressed engaging groove 111 is formed on the inner periphery of the mounting hole 11, the thickness of which does not exceed half the thickness of the cover plate 10. A first anti-rotation recess 13 is formed on the outer periphery of the electrode hole 12 on the outer surface of the cover plate 10.

[0036] The pole assembly 20 includes an upper plastic 22 attached to the outer surface of the cover plate 10, a riveting block 21 inserted into the upper plastic 22, a pole 24 passing through the pole hole 12 from the inside to the outside, a sealing ring 23 clamping the pole 24 between the cover plate and the cover plate, and a current collector 25 connected to the bottom of the pole 24.

[0037] The upper plastic 22 includes an isolation plate 222 attached to the outer surface of the cover plate 10, a through hole 221 penetrating the isolation plate 222 and corresponding to the pole hole 12, an outer peripheral wall 223 extending upward from the outer edge of the isolation plate 222, and a lower extension ring 224 slightly protruding downward from the periphery of the through hole 221. The bottom surface of the isolation plate 222 has a first anti-rotation protrusion (not shown) protruding downward at the position of the first anti-rotation recess 13. The first anti-rotation protrusion is inserted into the first anti-rotation recess 13 to prevent the upper plastic from rotating relative to the cover plate 10.

[0038] The lower plastic 50 includes an injection buffer groove 51 corresponding to the mounting hole 11 and a through hole 52 corresponding to the pole hole 12. A second anti-rotation protrusion 53 is formed at the periphery of the through hole 52, protruding upwards. A second anti-rotation recess (not shown) is correspondingly provided at the periphery of the pole hole 12 of the cover plate 10 to receive the second anti-rotation protrusion 53. The first anti-rotation recess 13 and the second anti-rotation recess are located on the outer and inner surfaces of the cover plate, respectively, and each pair of the first and second anti-rotation recesses consists of a pair, with the line connecting each pair passing through the center of the pole hole 12. The line connecting the first and second anti-rotation recesses is perpendicular to each other.

[0039] The riveting block 21 has a through-hole 211, and a first concave ring 212 and a second concave ring 213 are machined downward around the periphery of the riveting hole 211. The first concave ring 212 is located below the second concave ring 213, and the inner diameter of the first concave ring 212 is smaller than the inner diameter of the second concave ring 213.

[0040] The sealing ring 23 includes a sealing ring body 231, a through hole 233 penetrating the sealing ring body 231, and an inner ring body 232 protruding upward from the periphery of the sealing ring body 231.

[0041] The pole post 24 comprises, from bottom to top, a first post 241, a second post 242, and a third post 243, with gradually decreasing outer diameters. The outer edge of the bottom surface of the first post 241 is recessed upward to form an edge groove 2411.

[0042] The current collector 25 includes an electrode connection end 251 connected to the first column 241 of the electrode 24, a cell connection end 252 formed by bending downward from one side of the electrode connection end 251, and a mating hole 253 formed through the electrode connection end 251. A recessed mating groove 254 is formed around the periphery of the mating hole 253.

[0043] Please refer to this carefully. Figure 4 As shown, the assembly steps of the pole assembly 20 are described below. First, the upper plastic 22 and the lower plastic 50 are attached to the upper and lower surfaces of the cover plate 10. The through hole 221 of the upper plastic 22 and the through hole 52 of the lower plastic 50 correspond to the pole hole 12. The lower extension ring 224 is inserted into the annular groove 121 around the pole post hole 12; then the riveting block 21 is placed inside the upper plastic 22; the sealing ring 23 is fitted onto the pole post 24 from top to bottom, with the bottom surface of the sealing ring 231 adhering to the upper surface of the first post 241, and the inner ring 232 adhering to the radial outer surface of the second post 242; the pole post 24 with the sealing ring 23 fitted is inserted upward into the pole post hole 12, with the second post 242 and the third post 243 passing through the through hole 52 of the lower plastic 50, the pole post hole 12 of the cover plate 10, and the through hole 221 of the upper plastic 22, and the third post 243 continuing to pass through the riveting hole 211 of the riveting block 21. At this time, the sealing ring 231 is clamped between the upper surface of the first post 241 and the bottom surface of the cover plate 10, and the inner ring 232 is isolated. The second column 242 is positioned at the edge of the pole hole 12, and the bottom surface of the rivet block 21 is supported on the upper surface of the second column 242. Finally, the rivet block 21 and the pole 24 are pressed together by a jig, so that the sealing ring 231 is sufficiently compressed to achieve a seal, until the rivet block 21 and the surface of the second column 242 are in close contact. Then, the third column 243 is pressed by a riveting press, so that the third column 243 expands radially outward and extends to the first concave ring 212 around the rivet hole 211 to fix the pole 24 and the rivet block 21 together, thus completing the assembly. Finally, the current collector 25 is welded to the bottom of the first column 241 of the pole 24. Specifically, the edge groove 2411 of the first column 241 and the mating groove 254 of the current collector 25 are mated together and then welded to the ground for fixation.

[0044] Please continue reading. Figures 6 to 8As shown, the injection mechanism 30 includes a cylindrical body 31, a cylindrical edge 32 extending obliquely upward from the edge of the cylindrical body 31, a recessed hole 33 formed in the middle of the cylindrical edge 32, and an injection hole 34 penetrating the cylindrical body 31 and communicating with the recessed hole 33. The outer side of the cylindrical body 31 is tapered, defined as an outer inclined surface 311. The radially inner side of the recessed hole 33 is inclined to form an inner inclined surface 331, the inclination angle of the inner inclined surface 331 being greater than the inclination angle of the outer inclined surface 311. The radially outer side of the cylindrical edge 32 is a vertical circumferential surface, and a support wing 322 extends radially from the lower outer side of the cylindrical edge 32. Above the support wing 322, the cylindrical edge 32 forms an exposed protrusion 321, the outer diameter of which is smaller than the outer diameter of the support wing 322.

[0045] During assembly, the injection mechanism 30 and the cover plate 10 must be assembled and fixed first before the lower plastic 50 is installed. The cylinder 31 is received downwards within the injection buffer groove 51 of the lower plastic 50. The injection mechanism 30 is inserted into the mounting hole 11 of the cover plate 10 from the inside out. The upper surface of the cylinder edge 32 is flush with the outer surface of the cover plate 10, and the support wing 322 abuts against the engaging groove 111 inside the mounting hole 11. Subsequently, a first sealing weld ring S1 is formed by welding a ring at the joint between the cylinder edge 32 and the cover plate 10. The bottom surface of the support wing 322 is flush with the inner surface of the cover plate 10, and the joint between the support wing 322 and the engaging groove 111 is welded to form a second sealing weld ring S2. In one embodiment, the second sealing weld ring S2 can be omitted, and only the first sealing weld ring S1 needs to be retained. In another embodiment, the first sealing welding ring S1 can be omitted and not welded, and only the second sealing welding ring S2 is retained.

[0046] Example 2 Please see Figure 9 As shown, unlike Embodiment 1, Embodiment 2 differs in that: given the large size of the cover plate 10 and the extremely high hardness of the material, making it difficult to process, the engaging groove 111 is no longer machined around the mounting hole 11. The liquid injection mechanism 30 increases the height of the cylindrical edge 32, meaning the top surface of the cylindrical edge 32 remains flush with the outer surface of the cover plate 10 and is welded to form a first sealing weld ring S1; the support wing 322 is directly supported on the inner surface of the cover plate 10. Correspondingly, the lower plastic 50 has a recess 54 around the periphery of the liquid injection buffer groove 51 to accommodate the support wing 322. This structure still achieves the same effect as Embodiment 1.

[0047] Example 3 Please continue reading. Figure 10As shown, unlike Embodiment 1, Embodiment 3 differs in that the supporting wing 322 formed by the outward expansion of the lower part of the cylindrical edge 32 is directly removed, so that the thickness of the cylindrical edge 32 is consistent with the thickness of the cover plate 10 or the depth of the mounting hole 11. Then, the cylindrical edge 32 and the cover plate 10 are welded together at the joint. The first sealing welding ring S1 and the second welding ring S2 as described in Embodiment 1 can be formed by welding on the outer surface and / or the inner surface of the cylindrical edge 32, respectively. Of course, in one embodiment, the inner side of the cylindrical edge 32 may extend beyond the inner surface of the cover plate 10. In this case, welding is chosen to form the first sealing welding ring S1.

[0048] Example 4 Please continue reading. Figure 11 As shown, unlike Embodiment 2, Embodiment 4 differs in that the support wing 322 of the injection mechanism 30 is disposed on the upper end of the cylinder edge 32, and the engaging groove 111 of the mounting hole 11 of the cover plate 10 is formed on one side of the upper surface of the periphery of the mounting hole 11. Furthermore, the first sealing welding ring S1 is formed by welding at the joint between the support wing 322 and the engaging groove 111.

[0049] The liquid injection mechanism 30 described in Examples 1 to 4 is made of the same material as the cover plate 10 to facilitate welding.

[0050] This application also includes a secondary battery, which includes a battery casing, a battery cell encapsulated within the battery casing, and a battery top cover, wherein the battery top cover closes the battery casing and is electrically connected to the battery cell.

[0051] To address the difficulty in machining injection holes on the cover plate 10 due to the hardening and thinning of the material, the battery top cover and secondary battery of this application solve the problem. Simple mounting holes 11 are directly punched on the cover plate 10, and then an independently set injection mechanism 30 is installed and welded into the mounting holes 11. The independent injection mechanism 30 can be obtained by batch stamping or other processing methods using thicker plates.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery top cover, characterized in that, The device includes a cover plate through which an electrode post hole and a mounting hole are formed, an electrode post assembly assembled on the electrode post hole, and a liquid injection mechanism assembled in the mounting hole. The liquid injection mechanism includes a cylinder, a cylinder edge extending upward from the edge of the cylinder, and a liquid injection hole penetrating the liquid injection mechanism. The outer diameter of the cylinder edge is adapted to the mounting hole and inserted into the mounting hole. The joint between the cylinder edge and the mounting hole is welded to fix and seal the liquid injection mechanism and the cover plate together.

2. The battery top cover as described in claim 1, characterized in that, The top surface of the cylinder edge is flush with the outer surface of the cover plate, and a first sealing weld ring is formed by welding the cylinder edge and the cover plate together at the mounting hole from the outside.

3. The battery top cover as described in claim 2, characterized in that, The bottom surface of the cylinder edge is flush with the inner surface of the cover plate, and a second sealing weld ring is formed by welding the cylinder edge and the cover plate together at the mounting hole from the inside.

4. The battery top cover as described in claim 2, characterized in that, The support wing protrudes radially outward from the lower side of the cylinder and is supported on the inner side of the cover plate.

5. The battery top cover as described in claim 4, characterized in that, The inner edge of the mounting hole of the cover plate is recessed upward to form a locking groove. The support wing is inserted into the locking groove and the bottom surface of the support wing is flush with the bottom surface of the cover plate. A second sealing welding ring is formed by welding a ring at the junction of the support wing and the periphery of the locking groove.

6. The battery top cover as described in claim 4, characterized in that, The supporting wing is supported on the inner surface of the cover plate, and the bottom surface of the supporting wing is lower than the inner surface of the cover plate. The battery top cover also includes a lower plastic attached to the inner surface of the cover plate. The lower plastic is provided with a liquid injection buffer groove at the position corresponding to the mounting hole. The cylinder is located in the liquid injection buffer groove, and a recessed groove is provided around the liquid injection buffer groove to accommodate the supporting wing.

7. The battery top cover as described in claim 2, characterized in that, The cylinder has a recessed center forming a sinkhole that connects to the injection hole. The cylinder has a semi-conical structure and includes an inclined outer surface. The sinkhole has an inclined inner surface formed on its radial outer wall, and the inclination of the inner surface is greater than that of the outer surface.

8. The battery top cover as described in claim 1, characterized in that, The liquid injection mechanism and the cover plate are made of the same metal material, which is stainless steel or titanium alloy.

9. The battery top cover as described in claim 1, characterized in that, The pole assembly includes an upper plastic attached to the outer surface of the cover plate, a riveting block housed within the upper plastic, a pole, and a sealing ring fitted around the pole. A lower plastic is also attached to the inner surface of the cover plate. The pole comprises, from bottom to top, a first pole, a second pole, and a third pole with gradually decreasing outer diameters. The sealing ring includes a sealing ring body attached to the upper surface of the first pole, a through hole penetrating the sealing ring body, and an inner ring body extending upwards from the periphery of the through hole. The outer edge of the first pole is supported and confined on the lower plastic. The sealing ring body is clamped between the bottom surface of the cover plate and the upper surface of the first pole. The inner ring body isolates the outer peripheral surface of the second pole from the inner wall surface of the pole hole. The riveting block has a through-hole. The third pole passes through the through-hole and is stretched radially outwards by compression, deforming the third pole and fixing it within the through-hole.

10. The battery top cover as described in claim 9, characterized in that, The rivet block around the rivet hole is provided with a first concave ring and a second concave ring with increasing inner diameter from bottom to top. The upper surface of the third column does not exceed the upper surface of the rivet block. After the third column is deformed, it is snapped onto the upper surface of the first concave ring to fix the pole post and the rivet block together.

11. The battery top cover as described in claim 10, characterized in that, The outer surface of the cover plate has a pair of first anti-rotation recesses with lines passing through the center of the pole hole on the outer periphery of the pole hole. The bottom of the upper plastic has a first anti-rotation protrusion that fits into the first anti-rotation recess. The inner surface of the cover plate has a pair of second anti-rotation recesses with lines passing through the center of the pole hole on the outer periphery of the pole hole. The upper side of the lower plastic has a corresponding position with a second anti-rotation protrusion that fits into the second anti-rotation recess. The lines connecting the first anti-rotation recesses and the lines connecting the second anti-rotation recesses are perpendicular to each other.

12. The battery top cover as described in claim 11, characterized in that, The battery top cover also includes a current collector, which is L-shaped. The outer edge of the bottom of the first column is cut off to form an edge groove. The current collector includes a terminal connecting end connected to the first column, a cell connecting end formed by bending from the terminal connecting end and a mating hole through the terminal connecting end, and a mating groove formed by recessing on the periphery of the mating hole. The portion of the third column located at the edge groove is inserted into the mating hole, and the edge of the third column is inserted into the edge groove. The third column and the current collector are welded together at the joint.

13. A secondary battery, characterized in that, The battery includes a battery casing, a battery cell encapsulated within the battery casing, and a battery top cover as described in any one of claims 1-12, wherein the battery top cover closes the battery casing and is electrically connected to the battery cell.

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