A connecting block, a secondary battery top cover, and a secondary battery.

Abstract

A connecting block, a secondary battery top cover, and a secondary battery are disclosed. The connecting block includes a plate portion, an electrode post formed by punching or stretching downward from the middle of the plate portion, and a recess formed on the upper surface of the plate portion corresponding to the position of the electrode post. This application directly forms the electrode post in the connecting block, effectively reducing the number of parts, simplifying the process, and lowering manufacturing costs.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a connecting block, a secondary 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. A commonly used battery top cover structure uses a riveting block, which includes a cover plate with through-holes forming the electrode posts, an outer insulating component located on the upper side of the cover plate, a riveting block located above the outer insulating component, an inner insulating component attached to the lower side of the cover plate, and electrode posts that pass through the cover plate and riveting block from below and are riveted to the riveting block. The top of the electrode post is fixed to the riveting block by riveting, and a sealing ring is clamped between the electrode post and the cover plate for sealing.

[0003] The above solutions have problems such as large weight, high cost, and easy cracking of external insulation components due to riveting. For example, the weight of the riveting block plus the pole is not conducive to battery weight reduction, while the standalone pole solution also requires riveting and welding processes, resulting in high material and processing costs. Utility Model Content

[0004] Therefore, it is necessary to provide a connector block, a secondary battery top cover, and a secondary battery that are simple in structure, reduce weight, and lower cost.

[0005] To solve the above-mentioned technical problems, this application provides a connecting block, including a plate body, a pole formed by pressing or stretching downward from the middle of the plate body, and a recess formed on the upper surface of the plate body at the position corresponding to the pole.

[0006] Preferably, the connecting block includes a copper layer and an aluminum layer covering the upper side of the copper layer. The softened or molten aluminum layer is directly pressed onto the copper layer to form the copper-aluminum composite connecting block, and the outer surface of the pole is completely wrapped by the copper layer.

[0007] Preferably, the pole post includes a first column and a second column whose outer diameter decreases sequentially from top to bottom.

[0008] Preferably, a third column with an outer diameter smaller than that of the first column and larger than that of the second column is formed between the first column and the second column.

[0009] To solve the above-mentioned technical problems, this application also provides a secondary battery top cover, including the aforementioned connecting block, a cover plate through which terminal holes are formed, an inner insulating member attached to the lower surface of the cover plate, an outer insulating member attached to the upper surface of the cover plate, a conductive sheet attached to the inner insulating member, and a sealing ring. The sealing ring includes an inner ring body clamped between the bottom surface of the connecting block and the conductive sheet, and an outer ring body clamped between the bottom surface of the cover plate and the conductive sheet. The conductive sheet has a fixing hole in the middle for the second post to pass through. The upper side of the conductive sheet is limited to the bottom surface of the first post. The second post is welded and fixed together with the fixing hole.

[0010] Preferably, the outer insulating member includes an insulating plate body attached to the upper surface of the cover plate, an outer wall protruding upward from the periphery of the insulating plate body to partially surround the outer edge of the connecting block, and a through hole formed through the insulating plate body. A lower edge ring body is formed by protruding downward from the periphery of the through hole. The lower edge ring body is pressed into the inner side of the pole hole of the cover plate. There is a gap between the lower edge ring body and the first pole body. The top end of the inner ring of the sealing ring is inserted into the gap between the lower edge ring body and the first pole body.

[0011] Preferably, the inner insulating member includes an adhesive body attached to the lower surface of the cover plate, a through hole formed through the adhesive body, and a receiving cavity formed on the bottom surface of the adhesive body for receiving the conductive sheet. The receiving cavity has a surrounding wall formed on its outer periphery. The outer ring of the sealing ring is located between the inner wall surface of the through hole and the outer surface of the first column in the radial direction, and the outer ring is clamped between the conductive sheet and the lower surface of the cover plate in the vertical direction.

[0012] To address the aforementioned technical problems, this application also provides a secondary battery top cover, comprising the aforementioned connecting block, a cover plate through which a terminal hole is formed, an inner insulating component attached to the lower surface of the cover plate, an outer insulating component attached to the upper surface of the cover plate, a conductive sheet attached to the inner insulating component, and a sealing ring. The terminal and the conductive sheet are welded and fixed together. The bottom surface of the first post is flush with the bottom surface of the cover plate. The sealing ring is clamped vertically between the bottom surface of the first post, the bottom surface of the cover plate, and the upper surface of the conductive sheet. The conductive sheet has a fixing hole in the middle for the second post to pass through. The upper side of the conductive sheet is limited to the bottom surface of the third post. The second post is welded and fixed together with the fixing hole.

[0013] Preferably, the external insulating member includes an insulating plate body attached to the upper surface of the cover plate, an outer peripheral wall protruding upward from the periphery of the insulating plate body to partially surround the outer edge of the connecting block, and a through hole formed through the insulating plate body. A lower edge ring body is formed by protruding downward from the periphery of the through hole. The lower edge ring body is pressed into the inner side of the pole hole of the cover plate and is attached to the outer peripheral surface of the first pole body.

[0014] Preferably, the inner insulating component includes an adhesive body attached to the lower surface of the cover plate, a through hole formed through the adhesive body, and a receiving cavity formed on the bottom surface of the adhesive body for accommodating the conductive sheet. The receiving cavity has a surrounding wall formed on its outer periphery. The sealing ring is located in the radial direction between the inner wall surface of the through hole and the outer surface of the third column. The upper surface of the sealing ring is pressed against the bottom surface of the cover plate and the bottom surface of the first column in the radial direction. The lower surface of the sealing ring is pressed against the upper surface of the conductive sheet. The sealing ring is clamped by the clamping force applied by the bottom surface of the cover plate, the bottom surface of the first column, and the surface of the conductive sheet to achieve sealing.

[0015] Preferably, the conductive sheet includes a sheet body, the fixing hole is formed through the sheet body, the bottom surface of the sheet body is recessed upward at the periphery of the fixing hole to form a concave ring, the bottom surface of the second column is flush with the bottom surface of the concave ring, the second column is welded to the joint gap of the fixing hole, and the weld point generated by the welding does not extend downward beyond the height of the concave ring, that is, does not extend beyond the lower surface of the sheet body.

[0016] Preferably, the cover plate is formed by pressing downward on both sides of the pole hole to form a first positioning structure. The first positioning structure includes a first positioning recess recessed from the upper surface of the cover plate and a first positioning protrusion protruding from the lower surface of the cover plate. The inner insulating member is formed by recessing downward corresponding to the first positioning protrusion to form a second positioning structure. The second positioning structure includes a second positioning recess into which the first positioning protrusion is inserted and a second positioning protrusion protruding from the bottom surface of the inner insulating member. The outer insulating member is formed by protruding from the first positioning recess and being inserted into the first positioning recess. The conductive sheet is provided with a third positioning recess at the position corresponding to the second positioning protrusion.

[0017] Preferably, the third positioning recess is confined within the receiving cavity and is integrally connected to the surrounding wall, and the third positioning recess has an open outer structure.

[0018] To address the aforementioned technical problems, this application also provides a secondary battery, including a housing, a cell unit encapsulated within the housing, and the aforementioned secondary battery top cover, wherein the secondary battery top cover is used to seal the housing.

[0019] This application directly forms the pole on the connecting block, which, compared to the prior art where independent poles are riveted to the connecting block, can effectively reduce product costs and simplify assembly, requiring only welding. Compared to the prior art where riveting is followed by welding, this greatly reduces process costs. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Example 1

[0022] Figure 1 This is a perspective view of the top cover of the secondary battery according to Embodiment 1 of this application;

[0023] Figure 2 This is an exploded perspective view of the top cover of the secondary battery according to Embodiment 1 of this application;

[0024] Figure 3 For along Figure 2 The cross-sectional view shown by the dashed line AA;

[0025] Figure 4 This is a perspective view of the outer insulating component of the secondary battery top cover according to Embodiment 1 of this application;

[0026] Figure 5 This is a perspective view of the inner insulating component of the secondary battery top cover according to Embodiment 1 of this application.

[0027] Figure 6 For along Figure 1 The cross-sectional view shown by the dashed line BB;

[0028] Example 2

[0029] Figure 7 This is an exploded perspective view of the secondary battery top cover according to Embodiment 2 of this application;

[0030] Figure 8 This is a perspective view of the connecting block of the secondary battery top cover according to Embodiment 2 of this application;

[0031] Figure 9 For along Figure 8 The cross-sectional view shown by the dashed CC line;

[0032] Figure 10 This is a cross-sectional view of the top cover of the secondary battery according to Embodiment 2 of this application;

[0033] Example 3

[0034] Figure 11 This is a schematic diagram of the metal sheet in Embodiment 3 of this application;

[0035] Figure 12 For along Figure 11 The cross-sectional view shown by the dashed DD line;

[0036] Example 4

[0037] Figures 13 to 15 This is a schematic diagram of the thermoforming process of the connecting block in Embodiment 4 of this application.

[0038] Explanation of reference numerals in the attached figures

[0039] Cover plate - 10; Pole post hole - 11; First positioning structure - 12; First positioning recess - 121; First positioning protrusion - 122; Connecting block - 20; Aluminum layer - 21; Copper layer - 22; Pole post - 23; Recess - 24; Plate body - 25; First pillar - 201; Second pillar - 202; Third pillar - 203; Bottom surface of plate body - 231; First stepped surface - 232; Bottom surface of pole post - 233; Second stepped surface - 234; Outer insulation component - 30; Isolation plate body - 31; Outer wall - 32; Receiving cavity - 33; Through hole - 34; Lower edge ring body - 35 ; Third positioning protrusion-36; Conductive sheet-40; Sheet body-41; Fixing hole-42; Third positioning recess-43; Recessed ring-44; Inner insulating component-50; Fitting body-51; Through hole-52; Second positioning structure-53; Second positioning recess-531; Second positioning protrusion-532; Surrounding wall-54; Receiving cavity-55; Sealing ring-60; Inner ring body-61; Sealing hole-62; Outer ring body-63; Thermoforming mold-70; First mold-701; Second mold-702; First cavity-71; Second cavity-72; Joint seam-73. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0041] This application is based on 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.

[0042] Example 1

[0043] Please see Figures 1 to 6As shown, the secondary battery top cover of this embodiment includes a cover plate 10, an inner insulating member 50 attached to the lower surface of the cover plate 10, an outer insulating member 30 attached to the upper surface of the cover plate 10, a connecting block 20 mounted on the outer insulating member 30 and integrally formed with a terminal post 23, a conductive sheet 40 placed on the inner insulating member 50 and welded and fixed to the terminal post 23 of the connecting block 20, and a sealing ring 60 clamping the cover plate 10, the terminal post 23 and the conductive sheet 40.

[0044] Please refer to this carefully. Figure 2 , Figure 3 As shown, the cover plate 10 is made of aluminum alloy, stainless steel, or titanium alloy. If stainless steel or titanium alloy is used, the cover plate 10 is thinner, while if aluminum alloy is used, the cover plate is relatively thicker. Stainless steel and titanium alloy have higher melting points, offering better safety. However, stainless steel is more difficult to process than aluminum alloy, making it generally unsuitable for machining complex structures on the cover plate 10, as this would increase manufacturing costs. Titanium alloy is even more difficult to process and has higher material costs, generally used in the aerospace field. Aluminum alloy is currently the material widely used in automotive power batteries and energy storage batteries, but due to its low melting point, it is prone to burning through and destroying the entire battery pack in a short time once a fire starts, resulting in a short explosion time and insufficient escape time for vehicle occupants. Stainless steel not only reduces material costs and improves space utilization but also enhances product safety, extending the time before a large-scale fire or explosion, providing more time for occupants to escape.

[0045] The cover plate 10 includes a through-hole 11 and a first positioning structure 12 formed by pressing downwards on both sides of the through-hole 11 in the transverse direction. The first positioning structure 12 includes a first positioning recess 121 formed inwardly from the upper surface of the cover plate 10 and a first positioning protrusion 122 formed protruding from the lower surface of the cover plate 10. The first positioning recess 121 and the first positioning protrusion 122 are formed by simultaneously pressing the first positioning structure 12 on both the outer and inner sides.

[0046] The conductive sheet 40 is made of copper alloy sheet and includes a sheet body 41, a fixing hole 42 formed through the sheet body 41 in a vertical direction, and third positioning recesses 43 formed by stamping on both sides of the fixing hole 42 in a horizontal direction. The third positioning recesses 43 are formed on the upper surface of the sheet body 41, the lower surface of the sheet body 41 is flat and does not have any protrusions, and the third positioning recesses 43 are opened laterally on the outer side in a notch-shaped circular shape. A concave ring 44 is formed by recessing upward at the periphery of the fixing hole 42 on the lower surface of the sheet body 41, and the bottom surface of the concave ring 44 is higher than the bottom surface of the sheet body 41.

[0047] Key references Figure 2 , Figure 3 , Figure 5 As shown, the inner insulating member 50 includes an adhesive body 51 attached to the lower surface of the cover plate 10, a through hole 52 formed through the adhesive body 51, a second positioning structure 53 formed on both sides of the through hole 52, and a receiving cavity 55 formed on the lower surface of the adhesive body 51 and surrounding the through hole 52. The second positioning structure 53 includes a second positioning recess 531 recessed downward from the upper surface of the adhesive body 51 and a second positioning protrusion 532 protruding from the lower surface of the adhesive body 51. The second positioning protrusion 532 is also surrounded within the receiving cavity 55. The receiving cavity 55 is formed by a surrounding wall 54 protruding from the lower surface of the adhesive body 51, and the lower surface of the second positioning protrusion 532 does not extend beyond the bottom surface of the surrounding wall 54. The conductive sheet 40 is pressed into the receiving cavity 55, and the periphery of the conductive sheet 40 is limited by the surrounding wall 54. The third positioning recess 43 of the conductive sheet 40 engages with the second positioning protrusion 532 to prevent rotation. The second positioning protrusion 532 is integrally connected to the surrounding wall 54 to enhance its strength.

[0048] Please continue reading. Figures 2 to 4 As shown, the outer insulating member 30 includes an insulating plate 31, an outer peripheral wall 32 protruding upward from the upper surface of the insulating plate 31, a receiving cavity 33 formed by the insulating plate 31 and the outer peripheral wall 32, and a through hole 34 formed through the insulating plate 31. The bottom surface of the insulating plate 31 protrudes downward to form a third positioning protrusion 36, and the edge of the through hole 34 extends downward to form a lower edge ring 35.

[0049] The sealing ring 60 includes an inner ring body 61, an outer ring body 63 extending radially outward from the lower side of the inner ring body 61, and a sealing hole 62 forming through the inner ring body 61. The outer diameter of the outer ring body 63 is larger than the outer diameter of the inner ring body 61, and the inner ring body 61 extends upward from the upper surface of the outer ring body 63.

[0050] The connecting block 20 includes a plate portion 25 and a downwardly protruding electrode post 23 formed by punching or stretching downward from the middle of the plate portion 25. When the connecting block 20 is used as the negative electrode, the connecting block 20 needs to include a copper layer that is welded and connected to the conductive sheet 40 and an aluminum layer exposed outside the cover plate 10; that is, the connecting block 20 needs to include both a copper layer and an aluminum layer. When the connecting block 20 is used as the positive electrode, it only needs to be manufactured using aluminum.

[0051] The connecting block 20 in this embodiment is described in detail using the negative electrode as an example. The connecting block 20 includes an aluminum layer 21 on the upper side and a copper layer 22 attached to the lower side of the aluminum layer 21. Before the electrode post 23 is stamped, the connecting block 20 has a flat structure. After stamping, the electrode post 23 is formed by a downward indentation from the middle part of the connecting block 20. The electrode post 23 includes a first column 201 and a second column 202 with gradually decreasing outer diameters from top to bottom. The bottom surface of the connecting block 20 is defined as the bottom surface 231 of the plate, the bottom surface of the first column 201 is defined as the first step surface 232, and the bottom surface of the second column 202 is defined as the bottom surface 233 of the electrode post. When the electrode post 23 is stamped, a pit 24 is formed at the stamping position corresponding to the connecting block 20, and the outer surface of the electrode post 23 is covered by the copper layer 22.

[0052] Key references Figure 6 As shown, the following will focus on the assembly method of the secondary battery top cover in this embodiment:

[0053] First, the outer insulating component 30 is assembled onto the outer surface of the cover plate 10. The third positioning protrusion 36 of the outer insulating component 30 enters the first positioning recess 121 on the outer surface of the cover plate 10, and the lower edge ring 35 is inserted into the edge of the pole hole 11. The inner insulating component 50 is then attached to the inner surface of the cover plate 10 and fixed to the inner surface of the cover plate 10 by means of snap-fit ​​or adhesive. The first positioning protrusion 122 enters the second positioning recess 531 on the surface of the inner insulating component 50 for limitation. The inner diameter of the through hole 52 of the inner insulating component 50 is much larger than the pole hole 11 of the cover plate 10 so that at least a portion of the inner surface of the cover plate 10 within the through hole 52 is exposed outside the inner insulating component 50; the stamped connecting block 20 is positioned on the outer insulating component 20, the plate body 25 of the connecting block 20 is at least partially surrounded by the receiving cavity 33, and the pole 23 passes through the through hole 34, the pole hole 11 and the through hole 52; the sealing ring 60 is inserted from the inside out onto the pole 23, the top of the inner ring 61 abuts against the bottom surface 231 of the plate body around the pole 23 and wraps around the outer periphery of the first pole 201, the outer ring 63 is located within the through hole 52 of the inner insulating component 50 and the upper surface of the outer ring 63 is attached to the inner surface of the cover plate 10; finally, the sheet of the conductive sheet 40 is inserted into the inner insulating component 50. Inside the receiving cavity 55 on the bottom surface of the insulating member 50, the second positioning protrusion 532 of the inner insulating member 50 is inserted into the third positioning recess 43 of the conductive sheet 40. The bottom surface of the outer ring 63 of the sealing ring 60 is supported on the upper surface of the conductive sheet 40. The second column 202 is inserted into the fixing hole 42 of the conductive sheet 40, and the upper surface of the conductive sheet 40 is limited to the first step surface 232 defined by the bottom surface of the first column 201, pressing the conductive sheet 40 and the connecting block 20 together, so that the bottom surface of the concave ring 44 of the conductive sheet 40 is flush with the bottom surface 233 of the pole defined by the bottom surface of the second column 202. At this time, the inner ring 61 of the sealing ring 60 is squeezed and clamped by the conductive sheet 40 and the bottom surface 231 of the plate, and the outer ring 63 is squeezed and clamped by the inner surface of the cover plate 10 and the conductive sheet 40. The outer contour of the conductive sheet 40 is consistent with the receiving cavity 55 of the inner insulating member 50, so that the conductive sheet 40 is confined within the receiving cavity 55. After pressing the connecting block 20 and the conductive sheet 40 together, continuous welding is performed at the joint between the conductive sheet 40 and the second column 202 to fix the connecting block 20 and the conductive sheet 40 together and form a weld ring S.

[0054] In this embodiment, the inner ring 61 of the sealing ring 60 achieves the seal between the bottom surface 231 of the connecting block 20 plate and the surface of the conductive sheet 40, and the outer ring 63 achieves the seal between the inner surface of the cover plate 10 and the surface of the conductive sheet 40, thus achieving double waterproofing, and the waterproofing no longer depends on the welding seal of the welding ring S.

[0055] In this embodiment, the pole post 23 is formed by directly pressing and stretching downward on the connecting block 20. Compared with the prior art, which uses an independent pole post riveted to the connecting block 20, this method can effectively reduce product costs and is simple to assemble, requiring only a welding process. Compared with the prior art, which uses riveting followed by welding, this method can greatly reduce process costs.

[0056] Example 2

[0057] Please see Figures 7 to 10 As shown, the difference between this embodiment and Embodiment 1 is as follows: First, the bottom surface of the connecting block 20 adopts a partial composite copper layer 22 scheme, that is, the copper layer 22 is only set on the bottom surface of the area where the pole post 23 needs to be stamped, and the rest of the plate body 25 of the connecting block 20 is made of aluminum. The partial copper layer 22 can effectively reduce the use of copper and reduce material costs; at the same time, the partial copper plating scheme is also applicable to Embodiment 1. Second, the structure of the pole post 23 is different from that of Embodiment 1. In this embodiment, the pole post 23 also has a third pole post 203 between the first pole post 201 and the second pole post 202, and the bottom surface of the first pole post 201 surrounding the third pole post 203 is defined as the second step surface 234. During assembly, the bottom surface 231 of the plate is pressed onto the isolation plate 31 of the outer insulating member 30, and the lower edge ring 35 of the outer insulating member 30 is attached to the outer periphery of the first column 201. No gap is left between the lower edge ring 35 and the outer periphery of the first body 201 to accommodate the inner ring 61 of the sealing ring 60. In this embodiment, the sealing ring 60 omits the upwardly extending inner ring 61 and only includes an outer ring 63 and a sealing hole 62 penetrating the outer ring 63. The upper surface of the outer ring 63 is attached radially to the second step surface 234 of the pole post 23 and the inner surface of the cover plate 10. The lower edge ring 35 is located between the inner side of the pole post hole 11 of the first column 201 and the cover plate 10 and is located above the outer ring 63.

[0058] The remaining structure of Embodiment 2 is basically the same as that of Embodiment 1. The design of the concave ring 44 of the conductive sheet 40 in Embodiments 1 and 2 serves to ensure that the weld joint between the conductive sheet 40 and the second column 202 needs to be welded within the concave ring 44, so that the weld point formed during welding will not protrude beyond the bottom surface of the sheet body 41 of the conductive sheet 40, thus keeping the bottom surface of the sheet body 41 smooth and flat.

[0059] In Embodiment 2, a third column 203 is machined on the pole post 23, and the sealing ring 60 is clamped on the bottom surface of the first column 201 outside the third column 203 to achieve waterproofing, without having to extend the sealing ring upward to form an inner ring 61 to be clamped on the bottom surface 231 of the plate. The height of the sealing ring is reduced in the vertical direction, resulting in better clamping and pressing effect and better waterproof performance.

[0060] Example 3

[0061] Please see Figure 11 , Figure 12 As shown, the copper-clad forming method for the connecting block 20 of this application involves first laying a pre-formed copper strip inside a forming device, then placing molten, semi-solid, or softened aluminum material outside the copper strip, and forming a composite strip of copper and aluminum material through extrusion molding. Finally, several pole posts 23 are continuously stamped on the composite strip, and finally cut to form the connecting block 20. The melting point of the copper material is higher than that of the aluminum material. During forming, the high-temperature softened aluminum material will not cause the copper material to melt and affect its shape, but the bonding surface between the softened aluminum material and the copper material will maintain good adhesion. The copper material can occupy the entire bottom surface or only a part of it and be wrapped by the aluminum material on three sides.

[0062] Example 4

[0063] Please see Figures 13 to 15 As shown, this embodiment includes a thermoforming mold 70, which comprises a first mold 701, a second mold 702 joined together, and a joint 73 between the first mold 701 and the second mold 702. The joined thermoforming mold 70 includes a first cavity 71 and a plurality of second cavities 72 formed by recessing downward from the surface of the first cavity 71. The joint 73 is located at the position of the second cavity 72, and the second cavity 72 corresponds to the pole post 23 of the connecting block 20.

[0064] In this embodiment, the copper strip is first stamped to form several pole post 23 structures (such as...). Figure 13 (As shown); then the formed copper strip is placed in the thermoforming mold 70, and several pole posts 23 on the copper strip are pressed into the second cavity 72 accordingly, while the remaining part of the copper strip is supported on the surface of the first cavity 71 (as shown). Figure 14 (As shown); then the softened aluminum material is pressed into the first cavity 71 and the portion of the copper strip pole 23 is filled; then the softened or cooled and hardened aluminum material is rolled to obtain the aluminum layer 21 (as shown). Figure 15(As shown); finally, the first mold 701 and the second mold 702 are disassembled to obtain a copper-aluminum composite strip, and the strip is cut to obtain the connecting block 20. The recess 24 can be formed during rolling or the recess 24 can be removed and replaced with a flat structure.

[0065] When the connecting block 20 of this application is used as the negative electrode, a copper-aluminum composite process is used, which greatly reduces the amount of copper material used.

[0066] This application also includes a secondary battery, the secondary battery comprising a housing, a cell unit encapsulated within the housing, and a top cover of the secondary battery that closes the housing and is electrically connected to the cell unit.

[0067] 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.

[0068] 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 connecting block, characterized in that, The plate includes a plate body, a pole formed by pressing or stretching downward from the middle of the plate body, and a recess formed on the upper surface of the plate body corresponding to the position of the pole. The connecting block includes a copper layer and an aluminum layer covering the upper side of the copper layer. The outer surface of the pole is covered by the copper layer.

2. The connecting block as described in claim 1, characterized in that, A softened or molten aluminum layer is directly pressed onto the copper layer to form a copper-aluminum composite connecting block.

3. The connecting block as described in claim 1, characterized in that, The pole comprises a first column and a second column whose outer diameter decreases sequentially from top to bottom.

4. The connecting block as described in claim 3, characterized in that, A third column with an outer diameter smaller than that of the first column and larger than that of the second column is formed between the first column and the second column.

5. A top cover for a secondary battery, characterized in that, The device includes a connecting block as described in claim 3, a cover plate through which a pole hole is formed, an inner insulating member attached to the lower surface of the cover plate, an outer insulating member attached to the upper surface of the cover plate, a conductive sheet attached to the inner insulating member, and a sealing ring. The sealing ring includes an inner ring body clamped between the bottom surface of the connecting block and the conductive sheet, and an outer ring body clamped between the bottom surface of the cover plate and the conductive sheet. The conductive sheet has a fixing hole in the middle for the second pole to pass through. The upper side of the conductive sheet is located on the bottom surface of the first pole. The second pole is welded and fixed together with the fixing hole.

6. The secondary battery top cover as described in claim 5, characterized in that, The external insulating component includes an insulating plate body attached to the upper surface of the cover plate, an outer wall protruding upward from the periphery of the insulating plate body to partially surround the outer edge of the connecting block, and a through hole formed through the insulating plate body. A lower edge ring body is formed by protruding downward from the periphery of the through hole. The lower edge ring body is pressed into the inner side of the pole hole of the cover plate. There is a gap between the lower edge ring body and the first pole body. The top end of the inner ring body of the sealing ring is inserted into the gap between the lower edge ring body and the first pole body.

7. The secondary battery top cover as described in claim 6, characterized in that, The inner insulating component includes an adhesive body attached to the lower surface of the cover plate, a through hole formed through the adhesive body, and a receiving cavity formed on the bottom surface of the adhesive body for accommodating the conductive sheet. A surrounding wall is formed on the outer periphery of the receiving cavity. The outer ring of the sealing ring is located between the inner wall surface of the through hole and the outer surface of the first column in the radial direction, and the outer ring is clamped between the conductive sheet and the lower surface of the cover plate in the vertical direction.

8. A top cover for a secondary battery, characterized in that, The device includes a connecting block as described in claim 4, a cover plate through which an electrode post hole is formed, an inner insulating component attached to the lower surface of the cover plate, an outer insulating component attached to the upper surface of the cover plate, a conductive sheet attached to the inner insulating component, and a sealing ring. The electrode post and the conductive sheet are welded and fixed together. The bottom surface of the first post is flush with the bottom surface of the cover plate. The sealing ring is clamped in the vertical direction between the bottom surface of the first post, the bottom surface of the cover plate, and the upper surface of the conductive sheet. The conductive sheet has a fixing hole in the middle for the second post to pass through. The upper side of the conductive sheet is limited to the bottom surface of the third post. The second post and the fixing hole are welded and fixed together.

9. The secondary battery top cover as described in claim 8, characterized in that, The external insulating component includes an insulating plate body attached to the upper surface of the cover plate, an outer wall protruding upward from the periphery of the insulating plate body to partially surround the outer edge of the connecting block, and a through hole formed through the insulating plate body. A lower edge ring body is formed by protruding downward from the periphery of the through hole. The lower edge ring body is pressed into the inner side of the pole hole of the cover plate and is attached to the outer peripheral surface of the first pole body.

10. The secondary battery top cover as described in claim 9, characterized in that, The inner insulating component includes an adhesive body attached to the lower surface of the cover plate, a through hole formed through the adhesive body, and a receiving cavity formed on the bottom surface of the adhesive body for accommodating the conductive sheet. A surrounding wall is formed on the outer periphery of the receiving cavity. The sealing ring is located in the radial direction between the inner wall surface of the through hole and the outer surface of the third column. The upper surface of the sealing ring is pressed against the bottom surface of the cover plate and the bottom surface of the first column in the radial direction. The lower surface of the sealing ring is pressed against the upper surface of the conductive sheet. The sealing ring is clamped by the bottom surface of the cover plate, the bottom surface of the first column, and the surface of the conductive sheet to achieve sealing.

11. The secondary battery top cover as described in claim 7 or 10, characterized in that, The conductive sheet includes a sheet body, the fixing hole is formed through the sheet body, the bottom surface of the sheet body is recessed upward at the periphery of the fixing hole to form a concave ring, the bottom surface of the second column is flush with the bottom surface of the concave ring, the second column is welded to the joint gap of the fixing hole, and the weld point produced by the welding does not extend downward beyond the height of the concave ring, that is, does not extend beyond the lower surface of the sheet body.

12. The secondary battery top cover as described in claim 11, characterized in that, The cover plate is formed by pressing downward on both sides of the pole hole to form a first positioning structure. The first positioning structure includes a first positioning recess recessed from the upper surface of the cover plate and a first positioning protrusion protruding from the lower surface of the cover plate. The inner insulating member is formed by recessing downward corresponding to the first positioning protrusion to form a second positioning structure. The second positioning structure includes a second positioning recess into which the first positioning protrusion is inserted and a second positioning protrusion protruding from the bottom surface of the inner insulating member. The outer insulating member is formed by protruding from the first positioning recess and being inserted into the first positioning recess. The conductive sheet is provided with a third positioning recess at the position corresponding to the second positioning protrusion.

13. The secondary battery top cover as described in claim 12, characterized in that, The third positioning recess is confined within the receiving cavity and is integrally connected to the surrounding wall; the third positioning recess has an open outer structure.

14. A secondary battery, characterized in that, It includes a housing, a cell unit encapsulated within the housing, and a secondary battery top cover as described in claim 5 or 8, the secondary battery top cover being used to seal the housing.

Images