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, the connecting block comprising a plate body part, a pole post formed by punching or stretching from the middle of the plate body part downward, and a stepped groove formed on the upper surface of the plate body part corresponding to the position of the pole post, a liquid injection hole being formed through the pole post downward from the stepped groove. The liquid injection hole is formed directly through the pole post of the connecting block, which can effectively simplify the process and reduce the manufacturing cost.

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. The battery top cover typically integrates terminal components for transmitting electrical energy, electrolyte injection holes, and explosion-proof components.

[0003] Patent application CN202510531006.X discloses a terminal post structure for a secondary battery top cover. By pressing the original riveting block (connecting block) on the outside of the cover downwards to form a terminal post that passes through the cover and enters the inside to connect to the battery cell, the number of parts and raw material usage are reduced, thus lowering manufacturing costs. However, the cover still needs to have an injection hole structure to implement the liquid injection process. Utility Model Content

[0004] Therefore, it is necessary to provide a connecting block, a secondary battery top cover, and a secondary battery that integrate liquid injection function.

[0005] To solve the above-mentioned technical problems, this application provides a connecting block, including a plate body, an electrode formed by pressing or stretching downward from the middle of the plate body, and a stepped groove formed on the upper surface of the plate body at the position corresponding to the electrode, with an injection hole formed through the electrode from the stepped groove downward.

[0006] Preferably, the pole post includes a first column, a third column, and a second column whose outer diameter decreases sequentially from top to bottom.

[0007] Preferably, the stepped groove includes at least a first step located on the upper surface of the periphery of the injection hole, a chemical forming nail is inserted into the injection hole, a sealing cap is fixed in the stepped groove, the sealing cap seals and covers the chemical forming nail and the injection hole, the sealing cap includes a cap body, a contact ring formed by bending downward from the periphery of the cap body and then bending upward, and an outwardly turned portion, the contact ring being supported and fixed on the surface of the first step.

[0008] Preferably, the stepped groove further includes a second step located above the first step and having an inner diameter greater than the first step, and a third step located above the second step and having an inner diameter greater than the second step; the top of the outward-turned portion does not extend upward beyond the surface of the second step, a clearance portion is formed at the lower part of the cover, and the chemically formed nail is located below the clearance portion.

[0009] 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 an electrode post 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 annulus clamped between the bottom surface of the first column, the bottom surface of the cover plate, and the conductive sheet, and a sealing hole for the electrode post to pass through. The conductive sheet has a fixing hole in the middle for the second column to pass through. The upper side of the conductive sheet is limited to the bottom surface of the third column. The second column is welded and fixed together with the fixing hole.

[0010] Preferably, the gap between the first column of the pole and the cover plate is covered by the upper surface of the sealing ring, that is, the upper surface of the sealing ring spans the bottom surface of the cover plate and the bottom surface of the first column.

[0011] Preferably, the outer 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. The lower edge ring body is located above the ring body of the sealing ring. 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. A surrounding wall is formed on the outer periphery of the receiving cavity.

[0012] Preferably, the conductive sheet includes a sheet body, the fixing hole is formed through the sheet body, the second post is inserted into the fixing hole, and is welded and fixed at the joint gap between the second post and the fixing hole.

[0013] 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. The third positioning recess is confined within the receiving cavity and is integrated with the surrounding wall. The third positioning recess is an open structure on the outside.

[0014] 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.

[0015] This application directly sets the injection hole on the connecting block with the electrode post formed by stamping, that is, the injection hole is sealed by means of the stepped groove structure of the electrode post itself, without having to separately stamp a complex injection structure on the cover plate, which can effectively reduce manufacturing costs. Attached Figure Description

[0016] 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: Figure 1 This is a perspective view of the top cover of the secondary battery in this application.

[0017] Figure 2 This is an exploded perspective view of the top cover of the secondary battery in this application.

[0018] Figure 3 This is an exploded perspective view of the secondary battery top cover from another angle.

[0019] Figure 4 For along Figure 2 The cross-sectional view shown by the dashed line AA.

[0020] Figure 5 for Figure 4 A magnified view of a portion of the dashed circle shown.

[0021] Figure 6 For along Figure 1 The cross-sectional view shown by the dashed line BB.

[0022] Explanation of reference numerals in the attached figures Cover plate -10; Pole post hole -11; First positioning structure -12; First positioning recess -121; First positioning protrusion -122; Connecting block -20; First column -201; Second column -202; Third column -203; Pole post -23; Bottom surface of plate -231; First stepped surface -232; Bottom surface of pole post -233; Second stepped surface -234; Stepped groove -24; First step -241; Second step -242; Third step -243; Plate body -25; Injection hole -26; Outer insulation component -30; Isolation plate -31; Outer wall -32; Receiving cavity -3 3; Through hole - 34; Lower edge ring - 35; Third positioning protrusion - 36; Conductive sheet - 40; Sheet body - 41; Fixing hole - 42; Third positioning recess - 43; 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; Ring body - 61; Sealing hole - 62; Stop bracket - 70; Sealing cover - 80; Cover body - 81; Contact ring - 82; Outwardly turned part - 83; Concave ring - 84; Avoidance part - 85; Formed nail - 90. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] Please see Figures 1 to 4 As shown, the secondary battery top cover of this application 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.

[0026] The cover plate 10 is made of aluminum alloy, stainless steel, or titanium alloy. The cover plate 10 includes a through-hole 11 and first positioning structures 12 formed downwardly on both sides of the through-hole 11 in the transverse direction. The first positioning structure 12 includes a first positioning recess 121 recessed inward from the upper surface of the cover plate 10 and a first positioning protrusion 122 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 stamping the first positioning structure 12 on both the outer and inner sides.

[0027] The conductive sheet 40 includes a sheet body 41, a fixing hole 42 formed through the sheet body 41 in the vertical direction, and third positioning recesses 43 formed by stamping on both sides of the fixing hole 42 in the lateral 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 circle.

[0028] 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 its periphery 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. A stop bracket 70 is also provided below the inner insulating member 50, located between the battery cell and the inner insulating member 50 within the battery casing.

[0029] The outer insulating component 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.

[0030] The sealing ring 60 includes a ring body 61 and a sealing hole 62 formed through the ring body 61.

[0031] Please continue reading. Figure 5 As shown, 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 conductive 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.

[0032] The connecting block 20 described in this application is illustrated using the positive electrode as an example. Before the stamping of the electrode post 23, the connecting block 20 is a flat plate structure. After stamping, the electrode post 23 is formed by a downward indentation from the middle portion of the connecting block 20. The electrode post 23 includes, from top to bottom, a first post 201, a third post 203, and a second post 202, whose outer diameters gradually decrease. The bottom surface of the connecting block 20 is defined as the plate bottom surface 231, the bottom surface of the first post 201 is defined as the first step surface 232, the bottom surface of the third post 203 is defined as the second step surface, and the bottom surface of the second post 202 is defined as the electrode post bottom surface 233. When the electrode post 23 is formed by stamping, a stepped groove 24 is formed at the stamping position corresponding to the connecting block 20. The stepped groove 24 includes a first step 241, a second step 242, and a third step 243 whose inner diameters increase sequentially from bottom to top. The stepped groove 24 represents multiple stamping processes of stamping the electrode post 23. A liquid injection hole 26 is formed downward through the electrode post 23 within the stepped groove 24. The liquid injection hole 26 connects the inside of the battery cell to the outside of the cover plate 10.

[0033] After electrolyte is injected into the cell through the injection hole 26, the injection hole needs to be sealed to maintain a tight seal. The injection hole is sealed by inserting a formation pin 90 into the injection hole 26. The formation pin 90 is a known technology and will not be described in detail here. After the formation pin 90 is inserted, a sealing cap 80 is pressed into the stepped groove 24 to protect it. The sealing cap 80 includes a cap body 81, a contact ring 82 formed by bending downwards and then upwards from the outer edge of the cap body 81, and an outwardly folded portion 83. A U-shaped concave ring 84 is formed on the contact ring 82, and a clearance portion 85 is formed on the inner side of the cap body 81. Specifically, the clearance portion 85 is used to avoid the top portion of the formed nail 90, the contact ring 82 is supported on the outer surface of the first step 241, and the outwardly turned portion 83 is preferably flush with the surface of the second step 242, and at most cannot exceed the surface of the third step 243. The sealing cap 80 is fixed to the connecting block 20 by welding at the position of the contact ring 82, and can achieve a seal.

[0034] Key references Figure 6 As shown, the following will focus on the assembly method of the secondary battery top cover in this embodiment: 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 member 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 range of the through hole 52 is exposed outside the inner insulating member 50; the stamped connecting block 20 is positioned on the outer insulating member 30, 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 into the outside of the pole 23, and the top of the ring 61 of the sealing ring 60 abuts against the first step surface 232 of the first column 201 and a portion of the inner surface of the cover plate 10, that is, the gap between the cover plate 10 and the pole 23 is covered by the ring 61. Finally, the conductive sheet 40 is inserted into the receiving cavity 55 on the bottom surface of the inner insulating member 50. The second positioning protrusion 532 of the inner insulating member 50 is engaged in the third positioning recess 43 of the conductive sheet 40. The bottom surface of the ring 61 of the sealing ring 60 is supported on the upper surface of the conductive sheet 40. The second pillar 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 second step surface 234 defined by the bottom surface of the third pillar 203, thus pressing the conductive sheet 40 and the connecting block 20 together. At this time, the ring 61 of the sealing ring 60 is squeezed and clamped by the conductive sheet 40, the inner surface of the cover plate 10, and the first step surface 232 defined by the first pillar 201. 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 limited to 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 weld and fix the connecting block 20 and the conductive sheet 40 together.

[0035] This application directly sets the injection hole 26 on the connecting block 20 with the stamped pole 23, that is, the injection hole 26 is sealed by means of the stepped groove 24 structure of the pole 23, without having to separately stamp a complex injection structure on the cover plate 10, which can effectively reduce manufacturing costs.

[0036] 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.

[0037] 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.

[0038] 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, comprising a plate body, a pole formed by punching or stretching downward from the middle of the plate body, and a stepped groove formed on the upper surface of the plate body at a position corresponding to the pole, characterized in that, A liquid injection hole is formed by extending downwards from the stepped groove through the electrode post.

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

3. The connecting block as described in claim 2, characterized in that, The stepped groove includes at least a first step located on the upper surface of the periphery of the injection hole. A chemically formed pin is inserted into the injection hole. A sealing cap is fixed in the stepped groove. The sealing cap seals and covers the chemically formed pin and the injection hole. The sealing cap includes a cap body, a contact ring formed by bending downward from the periphery of the cap body and then bending upward, and an outwardly turned portion. The contact ring is supported and fixed on the surface of the first step.

4. The connecting block as described in claim 3, characterized in that, The stepped groove also includes a second step located above the first step and having an inner diameter greater than the first step, and a third step located above the second step and having an inner diameter greater than the second step; the top of the outward-turned portion does not extend upward beyond the surface of the second step, and a clearance portion is formed at the lower part of the cover, with the chemically formed nail located below the clearance portion.

5. 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 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 annulus clamped between the bottom surface of the first column, the bottom surface of the cover plate, and the conductive sheet, and a sealing hole for the electrode post to pass through. The conductive sheet has a fixing hole in the middle for the second column to pass through. The upper side of the conductive sheet is located on the bottom surface of the third column. The second column is welded and fixed together with the fixing hole.

6. The secondary battery top cover as described in claim 5, characterized in that, The gap between the first column of the pole and the cover plate is covered by the upper surface of the sealing ring, that is, the upper surface of the sealing ring spans the bottom surface of the cover plate and the bottom surface of the first column.

7. The secondary battery top cover as described in claim 6, characterized in that, The outer 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. The lower edge ring body is located above the ring body of the sealing ring. 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.

8. The secondary battery top cover as described in claim 7, characterized in that, The conductive sheet includes a sheet body, the fixing hole is formed through the sheet body, the second column is inserted into the fixing hole, and is welded and fixed at the joint gap between the second column and the fixing hole.

9. The secondary battery top cover as described in claim 8, characterized in that, The cover plate is formed by pressing downwards 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 downwards 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 of the second positioning protrusion. The third positioning recess is confined within the receiving cavity and is integrated with the surrounding wall. The third positioning recess is an open structure on the outside.

10. A secondary battery, characterized in that, It includes a housing, a battery cell unit encapsulated within the housing, and a secondary battery top cover as described in claim 5, wherein the secondary battery top cover is used to seal the housing.

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