Battery top cover

Abstract

The utility model provides a battery top cover, which comprises upper plastic cement and a riveting block, the upper plastic cement is of a frame-shaped structure with a through hole in the bottom and assembled in a sinking groove of a top cover sheet, the riveting block is of a block-shaped structure with a through hole in the surface, and the riveting block is installed in the upper plastic cement; the riveting blocks comprise a positive electrode riveting block and a negative electrode riveting block; a connecting hole III communicated with the connecting hole II is formed in the surface of the positive electrode riveting block; the fixing plastic cement is arranged in the through holes of the connecting hole I, the connecting hole II and the connecting hole III in an injection molding manner; according to the utility model, the far end of the riveting block is fixed with the top cover sheet through fixed plastic injection molding, and meanwhile, the buckling groove on the top cover sheet is clamped with the convex clamping block, so that the fixing effect on the upper plastic is enhanced, and the upper plastic has enough rigid strength to resist upwarp deformation, thereby ensuring the smooth welding of the module and the stable shell pressure of the battery core; and the advantages of the eccentric riveting top cover are exerted.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and in particular to a battery top cover. Background Technology

[0002] With the development of new energy sources, the energy density requirements of existing batteries are further increasing. New energy power batteries are usually secondary batteries, which are batteries that can be used again after being discharged by recharging to activate the active materials.

[0003] The rapid development of lithium batteries has led to high capacity and high rate capability becoming the industry's mainstream, posing new challenges to individual battery cells. High rate capability means increased overcurrent, requiring a larger welding area for the module to meet temperature rise requirements. Therefore, the size of the terminal block in the top cover of the battery cell's mechanical components also needs to be increased. This has brought the eccentric riveting structure to the forefront. The eccentric structure allows for a larger area of ​​the riveting block while maintaining the same terminal block size, thus increasing the welding area with the module. However, the eccentricity between the riveting block and the terminal block causes severe warping at the distal end of the riveting block, making module welding difficult and hindering the full realization of the advantages of the eccentric riveting top cover.

[0004] To address this issue, we propose a battery top cover design to resolve the problem of the far end of the rivet block lifting up. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology. To achieve the above objective, this utility model adopts the following technical solution:

[0006] A battery top cover includes: a top cover sheet, wherein both ends of the upper surface of the top cover sheet have recessed grooves, at least one side of the recessed groove has a bottom wall that slopes outward to form a snap-fit ​​groove, a through-hole for mounting a terminal post is formed in the recessed groove, and a connecting hole is formed on the surface of the recessed groove on one side; an upper plastic, the upper plastic being a frame-shaped structure with a through hole at the bottom, the upper plastic being fitted into the recessed groove of the top cover sheet, and at least one piece of the upper plastic having a protruding latch on its bottom wall that mates with the snap-fit ​​groove; the upper plastic... The adhesive includes a positive electrode plastic and a negative electrode plastic, wherein the bottom of the positive electrode plastic has a second connection hole communicating with the first connection hole; a riveting block, wherein the riveting block is a block-shaped structure with through holes on its surface, and the riveting block is installed inside the plastic; the riveting block includes a positive electrode riveting block and a negative electrode riveting block, wherein the surface of the positive electrode riveting block has a third connection hole communicating with the second connection hole; and a fixing plastic, wherein the fixing plastic is injected into the through holes of the first connection hole, the second connection hole, and the third connection hole.

[0007] More preferably, the fixing plastic is an I-shaped column structure.

[0008] More preferably, the first connecting hole and the third connecting hole are stepped holes that mate with both ends of the fixing plastic.

[0009] More preferably, the lower surface of the top cover sheet is fitted with a lower plastic.

[0010] A battery top cover further includes a sealing ring and a terminal post. The terminal post has a step. The sealing ring is sleeved on the terminal post. The terminal post passes through the lower plastic, the top cover sheet, the upper plastic and the riveting block in sequence and is riveted to the riveting block. The sealing ring is located between the terminal post step and the top cover sheet.

[0011] More preferably, the electrode post includes a positive electrode post and a negative electrode post, with the positive electrode post located adjacent to the fixed plastic side.

[0012] More preferably, the top cover plate has a waist-shaped groove, an explosion-proof valve is installed in the waist-shaped groove, and a protective plate is provided at the top of the explosion-proof valve.

[0013] More preferably, a clearance hole is provided on the lower plastic surface at the position opposite to the first connecting hole, and a protective sticker is affixed to the bottom of the clearance hole.

[0014] More preferably, the four corners of the settling tank are provided with through positioning holes, and the upper plastic is injection molded with positioning posts that cooperate with the positioning holes.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model uses fixed plastic injection molding to fix the far end of the riveting block to the top cover plate, and at the same time, it uses the buckle groove on the top cover plate to engage with the protruding block, which strengthens the fixing effect of the plastic and gives it sufficient rigidity to resist warping deformation, thereby ensuring smooth module welding and stable cell shell pressure, and giving full play to the advantages of the eccentric riveting top cover. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a partial explosion of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the overall explosion of this utility model. Figure 2 ;

[0019] Figure 3 This is an assembly diagram of the present invention;

[0020] Figure 4 This is a cross-sectional view of the present invention;

[0021] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle;

[0022] Figure 6 for Figure 5A magnified view of a portion of point C.

[0023] In the diagram: 1. Top cover plate; 2. Lower plastic; 3. Sealing ring; 4. Terminal post; 5. Upper plastic of negative electrode; 6. Riveting block of negative electrode; 7. Upper plastic of positive electrode; 8. Fixing plastic; 9. Riveting block of positive electrode; 10. Protective sticker; 15. Explosion-proof valve; 16. Protective plate; 11. Slot; 12. Terminal post mounting hole; 13. Positioning hole; 14. Connection hole one; 111. Clip groove; 71. Connection hole two; 91. Connection hole three; 92. Protruding clip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-6 A battery top cover includes: a top cover piece 1, with recessed grooves 11 at both ends of the upper surface of the top cover piece 1; at least one side of the recessed groove 11 has its bottom wall inclined outward to form a snap-fit ​​groove 111; a through-hole terminal mounting hole 12 is provided in the recessed groove 11; and a connecting hole 14 is provided on the surface of one side of the recessed groove 11; an upper plastic, which is a frame-shaped structure with a through hole at the bottom; the upper plastic is fitted into the recessed groove 11 of the top cover piece 1; and at least one of the bottom walls of the upper plastic is provided with a protruding snap-fit ​​block 92 that mates with the snap-fit ​​groove 111. The upper plastic includes a positive electrode upper plastic 7 and a negative electrode upper plastic 5. The bottom of the positive electrode upper plastic 7 has a second connection hole 71 that communicates with the first connection hole 14. The riveting block is a block-shaped structure with through holes on its surface and is installed inside the upper plastic. The riveting block includes a positive electrode riveting block 9 and a negative electrode riveting block 6. The surface of the positive electrode riveting block 9 has a third connection hole 91 that communicates with the second connection hole 71. The fixing plastic 8 is injected into the through holes of the first connection hole 14, the second connection hole 71 and the third connection hole 91.

[0026] In this embodiment: both sides of the upper surface of the top cover plate 1 are provided with recessed grooves 11. The bottom of the side wall of the recessed groove 11 on one side (located on the right side in this embodiment) or both sides is inclined outward to form a snap-fit ​​groove 111. The bottom wall of the positive electrode plastic 7 is provided with a protruding snap block 92 that cooperates with the snap-fit ​​groove 111, or the bottom walls of the positive electrode plastic 7 and the negative electrode plastic 5 are provided with a protruding snap block 92 that cooperates with the snap-fit ​​groove 111. The positive electrode plastic 7 and the negative electrode plastic 5 can be installed in the recessed grooves 11 on both sides, and then the rivet block can be installed into the plastic. Alternatively, the rivet block can be installed into the plastic first, and then installed into the recessed groove 11 together. In this embodiment, the top cover plate 1, the positive electrode plastic 7 and the positive electrode rivet block 9 are provided with connecting holes at their relative positions. Nanoplastic is injected into the three connecting holes to fix the far end of the positive electrode rivet block 9 to the top cover plate 1.

[0027] The fixing plastic 8 is an I-shaped column structure, and the connecting hole 14 and the connecting hole 91 are stepped holes that mate with both ends of the fixing plastic 8.

[0028] In the embodiment: Connecting hole 14 and connecting hole 91 are stepped holes. Connecting hole 14 consists of two circular holes of different diameters, with the diameter of the hole on the upper surface being smaller than that on the lower surface. Connecting hole 91 consists of three circular holes of different diameters, with the diameter of the circular holes decreasing sequentially from top to bottom. The stepped connecting holes 14 and 91 form an I-shaped columnar structure for fixing plastic 8, ensuring that the positive electrode rivet block 9 will not loosen from both sides after being fixed to the top cover plate 1. The I-shaped fixing plastic 8 mates with the two circular holes at the bottom of connecting hole 91, and the circular holes on the upper surface are reserved to prevent the upper surface of the fixing plastic 8 from protruding from the top surface of the rivet block.

[0029] The lower surface of the top cover 1 is fitted with a lower plastic 2. A clearance hole is provided on the surface of the lower plastic 2 relative to the connection hole 14. A protective sticker 10 is attached to the bottom of the clearance hole.

[0030] In this embodiment: the lower surface of the top cover 1 is fixed to the lower plastic 2 by heat fusion through the undercut hole. The lower plastic 2 has a clearance hole at the relative position of the connection hole 14. When the fixed plastic 8 is injection molded, the bottom of the top cover 1 needs to be limited by the tooling. Therefore, a clearance hole is provided at the injection position of the lower plastic 12. After the injection is completed, the protective sticker 10 is attached to the clearance hole for insulation protection.

[0031] A battery top cover further includes a sealing ring 3 and a terminal post 4. The terminal post 4 has a step. The sealing ring 3 is sleeved on the terminal post 4. The terminal post 4 passes through the lower plastic 2, the top cover piece 1, the upper plastic and the riveting block in sequence and is riveted to the riveting block. The sealing ring is located between the terminal post step and the top cover piece 1. The terminal post 4 includes a positive terminal post and a negative terminal post. The positive terminal post is located on the side adjacent to the fixing plastic 8.

[0032] In this embodiment, after the sealing ring 3 is fitted onto the pole post 4, it is sequentially inserted into the mounting holes of the lower plastic 2, the top cover plate 1, the upper plastic and the rivet block. At this time, the bottom stepped surface of the pole post 4 presses against the bottom limit of the lower plastic 2. Then, the top of the pole post 4 is riveted to form a mounting platform and welded to fix the pole post 4 to the rivet block. In this embodiment, the positive pole post is installed on the side close to the fixed plastic 8 (left side).

[0033] The top cover plate 1 has a waist-shaped groove, and an explosion-proof valve 15 is installed in the waist-shaped groove. A protective plate 16 is provided at the top of the explosion-proof valve 15.

[0034] In this embodiment, when the secondary battery generates gas due to overcharging, over-discharging, or overheating, causing excessive internal pressure, the explosion-proof valve 15 and the protective plate 16 are damaged, allowing the gas formed inside the secondary battery to be discharged to the outside through the through hole of the explosion-proof valve 15.

[0035] The sink 11 has through positioning holes 13 at its four corners, and the upper plastic is injection molded with positioning posts that mate with the positioning holes 13.

[0036] In this embodiment, the number and position of the positioning holes 13 in the two side recesses 11 can be the same or different. There is one positioning hole 13, which is set at the corner of the recess 11. There can also be two positioning holes 13, which can be set at adjacent corners or diagonally opposite corners of the recess 11. There can also be three or four positioning holes 13, which are located at the corners of the recess 11. By opening the positioning holes 13 on the surface of the recess 11, when the upper plastic is injection molded, the upper plastic will be injection molded to form positioning posts that cooperate with the positioning holes 13, thereby improving the firmness and stability between the upper plastic and the top cover plate 1.

[0037] This utility model uses fixed plastic injection molding to fix the far end of the riveting block to the top cover plate, and at the same time, it uses the buckle groove on the top cover plate to engage with the protruding block, which strengthens the fixing effect of the plastic and gives it sufficient rigidity to resist warping deformation, thereby ensuring smooth module welding and stable cell shell pressure, and giving full play to the advantages of the eccentric riveting top cover.

Claims

1. A battery top cover, characterized in that, include: The top cover plate has grooves at both ends of its upper surface. At least one side of the groove has an outwardly inclined bottom wall forming a snap-fit ​​groove. A through pole mounting hole is provided in the groove, and a connection hole is provided on one side of the groove surface. The upper plastic is a frame-shaped structure with a through hole at the bottom. The upper plastic is assembled in the groove of the top cover plate. At least one of the upper plastic bottom walls is provided with a protruding clip that cooperates with the snap-on groove. The upper plastic includes a positive electrode upper plastic and a negative electrode upper plastic. The bottom of the positive electrode upper plastic is provided with a second connection hole that communicates with the first connection hole. The riveting block is a block-shaped structure with through holes on its surface, and the riveting block is installed in the upper plastic; the riveting block includes a positive riveting block and a negative riveting block, and the surface of the positive riveting block has a connecting hole three that communicates with the connecting hole two; A fixing plastic is injected into the through holes of the first connecting hole, the second connecting hole, and the third connecting hole.

2. The battery top cover according to claim 1, characterized in that, The fixing plastic is an I-shaped column structure.

3. A battery top cover according to claim 2, characterized in that, The first and third connecting holes are stepped holes that mate with both ends of the fixed plastic.

4. A battery top cover according to claim 1, characterized in that, The lower surface of the top cover is fitted with a lower plastic sheet.

5. A battery top cover according to claim 4, characterized in that, It also includes a sealing ring and a pole post. The pole post has a step. The sealing ring is sleeved on the pole post. The pole post passes through the lower plastic, the top cover plate, the upper plastic and the riveting block in sequence and is riveted to the riveting block. The sealing ring is located between the pole post step and the top cover plate.

6. A battery top cover according to claim 5, characterized in that, The electrode includes a positive electrode and a negative electrode, with the positive electrode located adjacent to the fixed plastic side.

7. A battery top cover according to claim 1, characterized in that, The top cover plate has an oblong groove, an explosion-proof valve is installed in the oblong groove, and a protective plate is provided at the top of the explosion-proof valve.

8. A battery top cover according to claim 5, characterized in that, An avoidance hole is provided on the lower plastic surface at the position opposite to the first connection hole, and a protective sticker is attached to the bottom of the avoidance hole.

9. A battery top cover according to claim 1, characterized in that, The settling tank has through positioning holes at its four corners, and the upper plastic is injection molded with positioning posts that mate with the positioning holes.

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