High-sealing-performance battery riveting end cover assembly and battery

Abstract

The utility model provides a battery riveting end cover assembly with high sealing performance and a battery, the battery riveting end cover assembly comprises an end cover body, a riveting block, a first insulating part and a riveting pole, and the end cover body is provided with a first through hole; the riveting block is provided with a second through hole; the first insulating part is provided with a third through hole; the riveting pole sequentially penetrates through the first through hole, the second through hole and the third through hole to rivet the end cover body, the first insulating part and the riveting block together, and the first insulating part is clamped between the end cover body and the riveting block; a containing groove is formed in the lower surface of the riveting block and surrounds the second through hole, an annular insulation flange is arranged on the upper surface of the first insulation part and surrounds the third through hole in a protruding mode, and the insulation flange extends into the containing groove and is matched with the containing groove in a concave-convex mode.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to the structure of battery end cap assemblies. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are choosing cylindrical battery riveted top cover structures to reduce costs and increase production capacity. Common problems: With the riveted top cover structure of cylindrical power batteries, the components are relatively compact and the assembly process requires high precision. When riveting them together, some components are prone to displacement and deformation under the riveting force, which also reduces the stability and sealing of the riveted top cover structure.

[0003] Therefore, there is an urgent need for a battery riveting end cap assembly and a battery that can solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a battery riveted end cap assembly with safety protection functions, which reduces the risk of fire and explosion of power batteries, while ensuring the compactness and structural stability of the power battery riveted top cover.

[0005] To achieve the above objectives, this utility model provides a high-sealing battery riveted end cap assembly, including an end cap body, a riveting block, a first insulating member, and a riveting post. The end cap body has a first through hole; the riveting block has a second through hole; the first insulating member has a third through hole; the riveting post passes through the first through hole, the second through hole, and the third through hole in sequence to rivet the end cap body, the first insulating member, and the riveting block together, with the first insulating member sandwiched between the end cap body and the riveting block; the lower surface of the riveting block has a receiving groove around the second through hole, and the upper surface of the first insulating member has an annular insulating flange protruding around the third through hole, the insulating flange extending into the receiving groove and engaging with the receiving groove.

[0006] Preferably, the upper surface of the riveting block has a riveting groove for riveting with the riveting pole, and the riveting pole includes a riveting pole head located on the side of the end cap body away from the riveting block, a riveting pole body extending upward from the riveting pole head and passing through the second through hole, and a riveting head that protrudes upward from the top of the riveting pole body, passes through the second through hole, and is riveted with the riveting groove.

[0007] More preferably, the riveted terminal body and the riveting head have a stepped structure, the stepped structure having an upward-facing stepped surface; the riveted terminal body extends into the receiving groove so that the stepped surface abuts against the bottom of the receiving groove, and the insulating flange is sandwiched between the outer wall of the riveted terminal body and the groove wall of the receiving groove, further enhancing the sealing performance of the battery end cap assembly.

[0008] More preferably, a stepped structure is provided between the riveted terminal body and the riveting head, the stepped structure having an upward-facing stepped surface; an annular conductive gasket is also sandwiched between the riveted terminal body and the stepped surface, one side of the annular conductive gasket being in contact with the stepped surface, and the other side being in contact with the bottom of the receiving groove, the insulating flange being sandwiched between the outer wall of the annular conductive gasket and the groove wall of the receiving groove. This not only increases the sealing performance of the battery end cap assembly, but also makes the riveting structure more stable and prevents damage to the battery end cap assembly during riveting.

[0009] Preferably, the rivet block or end cap body forming the rivet groove has a countersunk hole, the rivet groove is formed on the bottom wall of the countersunk hole, and the insulating plastic ring includes a first portion disposed between the rivet head and the rivet groove, a second portion disposed between the rivet head and the second through hole, and a third portion that bends and extends from the top of the first portion toward the bottom wall of the countersunk hole.

[0010] Preferably, the bottom of the riveting groove extends downward from the outside to the inside to form a conical groove bottom.

[0011] Preferably, the battery riveted end cap assembly further includes a second insulating element disposed between the riveted terminal post and the end cap body.

[0012] Specifically, the lower surface edge of the second insulating member is provided with a lower flange for limiting current collector and winding core protruding downward.

[0013] Specifically, the riveting pole includes a riveting pole head located on the side of the end cap body away from the riveting block, and the lower surface of the second insulating member is provided with a limiting protrusion wall protruding downward, and a limiting groove for accommodating the riveting pole head is formed between the limiting protrusion walls.

[0014] Specifically, the upper surface of the second insulating member has one or more protrusions, and the lower surface of the end cap body has one or more limiting grooves that engage with the protrusions; or, the upper surface of the second insulating member has one or more limiting grooves, and the lower surface of the end cap body has one or more protrusions that engage with the limiting grooves. This prevents the second insulating member from twisting relative to the end cap body.

[0015] Preferably, the battery riveting end cap assembly further includes a sealing ring, the sealing ring including a first sealing portion sleeved on the riveting post and located between the hole wall of the first through hole and the riveting post, and a second sealing portion formed by bending outward from the lower side of the first sealing portion, the second sealing portion being disposed between the riveting post and the lower surface of the end cap body.

[0016] Specifically, the wall of the third through hole in the first insulating member extends to the side wall of the riveted pole, and a portion of the first insulating member is located directly above the first sealing portion.

[0017] Preferably, the outer side of the first insulating member is provided with an outer flange protruding upward, and an annular rivet block receiving groove for receiving the rivet block is formed between the outer flange and the insulating flange; the upper surface of the end cap body is provided with an insulating member receiving groove for receiving the first insulating member, and the first insulating member is at least partially received in the insulating member receiving groove.

[0018] Preferably, the top of the insulating flange is provided with guide edges that gradually slope toward the middle of the insulating flange on both sides, so that the top of the insulating flange gradually narrows. This allows the insulating flange to be smoothly inserted into the inner wall of the receiving groove and the riveting pole during assembly. Furthermore, during riveting and pressing, the contact between the top of the insulating flange and the bottom of the receiving groove is tighter, increasing the sealing performance.

[0019] This utility model also provides a battery, including a battery casing, a battery cell, a current collector, and a battery riveting end cap assembly as described above. The battery cell is installed inside the battery casing, the current collector is electrically connected to the battery cell and the riveting terminal, and the battery riveting end cap assembly is installed on the battery casing. The end cap body is the cover plate of the battery casing or is integrally formed on the bottom of the battery casing.

[0020] Compared with the prior art, the present invention has a receiving groove formed around the second through hole on the lower surface of the riveting block, and an annular insulating flange protruding around the third through hole on the upper surface of the riveting post. The insulating flange extends into the receiving groove and engages with the receiving groove, so that when the riveting post rivets the riveting block, the first insulating component and the end cap body together, the insulating flange not only positions the riveting block in the horizontal direction by engaging with the riveting block, which facilitates assembly, improves the assembly success rate and reduces the possibility of relative translation between the first insulating component and the end cap body during riveting, but also plays a secondary sealing role in the vertical direction, resulting in better sealing performance of the manufactured battery end cap assembly. Attached Figure Description

[0021] Figure 1 This is a perspective view of the battery riveting end cap assembly of this utility model.

[0022] Figure 2This is an exploded view of the battery riveting end cap assembly of this utility model from one angle.

[0023] Figure 3 This is an exploded view of the battery riveting end cap assembly of this utility model from another angle.

[0024] Figure 4 This is a cross-sectional view of the battery riveting end cap assembly of this utility model.

[0025] Figure 5 yes Figure 4 Enlarged view of part a.

[0026] Figure 6 This is a structural diagram of the insulating plastic ring of this utility model.

[0027] Figure 7 This is a structural diagram of the riveted pole of this utility model.

[0028] Figure 8 yes Figure 1 Enlarged view of part a.

[0029] Figure 9 This is a structural diagram of the first insulating component of this utility model.

[0030] Figure 10 yes Figure 5 Enlarged view of part b in the middle. Detailed Implementation

[0031] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0032] This utility model discloses a battery, including a battery casing, a battery cell, a current collector, and a battery riveting end cap assembly 100. The battery cell is installed inside the battery casing, and the current collector electrically connects the battery cell and the riveting terminal 30. The battery riveting end cap assembly 100 is installed on the battery casing and closes the battery casing. The battery riveting end cap assembly 100 is cylindrical and serves as the end cap assembly for a cylindrical battery, resulting in a cylindrical battery. However, this application can also be used for prismatic batteries, in which case the end cap is square. Alternatively, the end cap body 10 of the battery riveting end cap assembly 100 can be integrally formed with the battery casing, in which case the end cap body 10 serves as the bottom of the battery casing.

[0033] refer to Figures 1 to 5The battery riveting end cap assembly 100 includes an end cap body 10, a riveting block 20, a riveting terminal 30, and an insulating structure 60. The insulating structure 60 includes a first insulating portion 61 disposed between the riveting block 20 and the end cap body 10. The end cap body 10 has a first through hole 11; the riveting block 20 has a second through hole 23; and the first insulating portion 61 has a third through hole 611. The riveting terminal 30 passes through the first through hole 11, the third through hole 611, and the second through hole 23 in sequence, riveting the end cap body 10, the first insulating component, and the riveting block 20 together. The first insulating component 61 is sandwiched between the end cap body 10 and the riveting block 20. The lower surface of the riveting block 20 has a receiving groove 24 around the second through hole 21, and the upper surface of the first insulating component 61 has an annular insulating flange 612 protruding around the third through hole 611. The insulating flange 612 extends into the receiving groove 24 and engages with the receiving groove 24.

[0034] refer to Figure 5 , Figure 9 and Figure 10 The insulating flange 612 has guide edges 6121 on both sides of its top end, gradually sloping towards the center of the insulating flange. This causes the top end of the insulating flange 612 to gradually narrow, allowing it to be smoothly inserted into the inner wall of the receiving groove 24 and the riveting post 30 during assembly. Furthermore, during riveting and pressing, the contact between the top end of the insulating flange 612 and the bottom of the receiving groove 24 is tighter, increasing the sealing performance. In this embodiment, the longitudinal cross-section of the top end of the insulating flange 612 is trapezoidal, and the guide edge 6121 is a straight line in its longitudinal cross-section. However, the guide edge 6121 can also be an arc-shaped surface in its longitudinal cross-section. The top end of the insulating flange 612 is a flat surface. Alternatively, the top end of the insulating flange 612 can be a convex arc surface.

[0035] refer to Figure 5 and Figure 7The riveting block 20 has a riveting groove 22, and the second through hole 23 is opened at the bottom of the riveting groove 22. The riveting pole 30 includes a riveting pole head 31 located inside the end cap body 10, a riveting pole body 32 extending upward from the riveting pole head 31 and passing through the second through hole 23, and a riveting head 33 protruding upward from the top of the riveting pole body 32, passing through the second through hole 23, and riveting with the riveting groove 22. During riveting, the riveting head 33 is pressed outward from the riveting hole 332, so that the edge of the riveting head 33 extends outward to form a riveting protrusion 331. There is a stepped structure between the riveting pole body 32 and the riveting head 33, and the stepped structure has an upward-facing stepped surface 321. An annular conductive pad 50 is sandwiched between the riveted pole body 32 and the stepped surface 321. One side of the annular conductive pad 50 is in contact with the stepped surface 321, and the other side is in contact with the bottom of the receiving groove 24. The insulating flange 612 is sandwiched between the outer wall of the annular conductive pad 50 and the groove wall of the receiving groove 24. In this embodiment, the annular conductive pad 50 is a PTC sheet 50, which serves as both a riveting pad and overheat protection. Of course, other conductive pads can also be used instead.

[0036] refer to Figures 1 to 5 The battery riveting end cap assembly 100 also includes an insulating plastic ring 40, which is disposed between the riveting groove of the riveting block 20 and the riveting terminal 30, so that the riveting terminal 30 and the riveting block 20 are insulated from each other except at the stepped surface 321; an annular conductive pad 50 is disposed between the first area of ​​the riveting block 20 and the riveting terminal 30, so that the PTC sheet 50 is respectively attached to the stepped surface 321 of the riveting terminal 30 and the bottom surface of the riveting block 20, forming a unique overcurrent path (the PTC sheet 50 can directly control the current from the cell, current collector, riveting terminal 30 to the riveting block 20 in sequence), so that when the battery / riveting terminal is at an abnormal high temperature, the PTC sheet (thermometer) can adapt and adjust the overcurrent in time by its own resistance change to ensure the safety of the battery.

[0037] The annular conductive pad 50 is annular in shape and is fitted onto the riveted post 30 through a central through-hole 51, and is insulated from the riveted post 30 by an insulating plastic ring 40. (Reference) Figure 5 and Figure 6 The insulating plastic ring 40 includes a first portion 41 disposed between the rivet joint 33 and the rivet groove 22, and a second portion 42 disposed between the rivet joint 33 and the second through hole 23. The second portion 42 further extends downward between the inner wall of the annular conductive pad 50 and the rivet joint 33, so that the inner wall of the annular conductive pad 50 and the outer wall of the rivet joint 33 are separated by an insulating material.

[0038] Preferably, the bottom of the riveting groove 22 gradually extends downward from the outside to the inside to form a conical groove bottom. The insulating plastic ring 40 includes a first portion 41 disposed between the riveting head 33 and the riveting groove 22, and the area 411 corresponding to the conical groove bottom of the first portion 41 is inclined. The riveting block 20 has a countersunk hole 21, and the riveting groove 22 is formed on the bottom wall of the countersunk hole 21. The insulating plastic ring 40 also includes a third portion 43 that bends and extends from the top of the first portion 41 towards the bottom wall of the countersunk hole 21. Preferably, the stepped surface 321 has an annular positioning groove 322 recessed near the inner side of the riveting head 33 for the insertion of the insulating plastic ring 40. The lower end of the second portion 42 of the insulating plastic ring 40 is inserted into the annular positioning groove 322, facilitating the fixation of the insulating plastic ring 40 and preventing the annular conductive pad 50 from contacting the riveting head 33 in other areas not in the vertical direction.

[0039] refer to Figures 2 to 5 The insulating structure 60 includes a second insulating member 63 disposed between the riveted terminal post 30 and the end cap body 10. Specifically, the lower surface edge of the second insulating member 63 has a downwardly protruding lower flange 632 for positioning the current collector and the winding core, so that after the battery end cap is assembled and installed on the battery, the second insulating member 63 positions the current collector and the winding core. (Reference) Figure 5 and Figure 8 The lower surface of the second insulating member 63 has a downwardly protruding limiting protrusion 633, and a limiting groove 634 is formed between the limiting protrusions 633 to accommodate the riveting pole head 31, preventing the riveting pole 30 from shifting during riveting. The second insulating member 63 has a through hole 631, through which the riveting pole 30 sequentially passes to the through hole 631, through hole 621, first through hole 11, through hole 51, third through hole 611, and second through hole 23 before being riveted to the riveting groove 22. More preferably, the upper surface of the second insulating member 63 has one or more protrusions 635, and the lower surface of the end cap body 10 has one or more limiting grooves 12 that engage with the protrusions. Of course, the positions of the protrusions 635 and the limiting grooves 12 can be interchanged. In this case, the upper surface of the second insulating member 63 has one or more limiting grooves, and the lower surface of the end cap body 10 has one or more protrusions that engage with the limiting grooves.

[0040] Specifically, the insulation structure 60 further includes a sealing ring 62. The sealing ring 62 includes a first sealing portion 622 sleeved on the riveting pole 30 and located between the hole wall of the first through hole 11 and the riveting pole 30, and a second sealing portion 623 formed by bending outward from the lower side of the first sealing portion 622. The second sealing portion 623 is disposed between the lower surface of the riveting pole 30 and the end cap body 10. The sealing ring 62 is sleeved on the riveting pole body 32 of the riveting pole 30 through the through hole 621.

[0041] To facilitate the assembly of the riveting block 20, the first insulating member 61, and the end cap body 10, an insulating member receiving groove 13 is formed on the upper surface of the end cap body 10 to accommodate the first insulating member 61. The first insulating member 61 is at least partially accommodated in the insulating member receiving groove 13. An outer flange 613 protrudes upward from the outer side of the first insulating member 61, and a riveting block receiving groove is formed between the outer flanges 613 to accommodate the riveting block 20. The riveting block 20 is accommodated in the riveting block receiving groove.

[0042] refer to Figure 2 and Figure 3 The following describes the assembly process of the battery riveting end cap assembly 100 of this utility model:

[0043] First, install the insulating plastic ring 40 in the riveting groove 22, and then place the third part 43 on the top of the riveting groove 22 (the bottom of the countersunk hole 21). Then, the sealing ring 62 is fitted onto the riveting pole body 32, and the annular conductive gasket 50 is fitted onto the riveting pole body 32. The riveting pole 30 with the sealing ring 62 and the annular conductive gasket 50 fitted onto it is positioned in the fixture. The second insulating member 63 is fitted onto the riveting pole 30 and positioned using the fixture. The end cap body 10 is fitted onto the riveting pole 30 and positioned using the fixture. The first insulating member 61 is fitted onto the riveting pole and positioned using the fixture. The riveting block 20 with the insulating plastic ring 40 fitted onto the riveting pole 30 is positioned using the fixture. The riveting head 33 is deformed through the riveting hole 332 to form the riveting protrusion 331. During the riveting process, the sealing ring 62 compresses and seals the riveting pole 30 and the end cap body 10. At the same time, the upper and lower sides of the annular conductive gasket 50 are respectively attached to the stepped surface 321 and the bottom of the PCT receiving groove 24 in the riveting block 20, and are sandwiched between the two.

[0044] In this embodiment, the end cap body 10 is an aluminum shell or a steel shell, and the riveting block 20 is made of aluminum, iron, or a composite material. The riveting pole is a copper pole.

[0045] In this invention, the vertical and horizontal positions are relative, not absolute. In this embodiment, the extension direction of the end cap body or the bottom shell of the battery case is horizontal, and the vertical direction is perpendicular to the horizontal direction.

[0046] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A battery riveted end cap assembly with high sealing performance, characterized in that: The device includes an end cap body, a riveting block, a first insulating component, and a riveting post. The end cap body has a first through hole; the riveting block has a second through hole; the first insulating component has a third through hole; the riveting post passes through the first through hole, the second through hole, and the third through hole in sequence to rivet the end cap body, the first insulating component, and the riveting block together, with the first insulating component sandwiched between the end cap body and the riveting block; the lower surface of the riveting block has a receiving groove around the second through hole, and the upper surface of the first insulating component has an annular insulating flange protruding around the third through hole, the insulating flange extending into the receiving groove and engaging with the receiving groove.

2. The battery riveting end cap assembly as described in claim 1, characterized in that: The upper surface of the rivet block has a rivet groove for riveting with the rivet pole. The rivet pole includes a rivet pole head located on the side of the end cap body away from the rivet block, a rivet pole body extending upward from the rivet pole head and passing through the second through hole, and a rivet head that protrudes upward from the top of the rivet pole body, passes through the second through hole, and is riveted with the rivet groove.

3. The battery riveting end cap assembly as described in claim 2, characterized in that: The riveted pole body and the riveted joint have a stepped structure, and the stepped structure has an upward-facing stepped surface; The riveted electrode extends into the receiving groove so that the stepped surface abuts against the bottom of the receiving groove, and the insulating flange is sandwiched between the outer wall of the riveted electrode and the groove wall of the receiving groove; or an annular conductive pad is also sandwiched between the riveted electrode and the stepped surface, one side of the annular conductive pad is in contact with the stepped surface, and the other side is in contact with the bottom of the receiving groove, and the insulating flange is sandwiched between the outer wall of the annular conductive pad and the groove wall of the receiving groove.

4. The battery riveting end cap assembly as described in claim 2, characterized in that: The rivet block or end cap body that forms the rivet groove has a countersunk hole, the rivet groove is formed on the bottom wall of the countersunk hole, and the insulating plastic ring includes a first part disposed between the rivet head and the rivet groove, a second part disposed between the rivet head and the second through hole, and a third part that bends and extends from the top of the first part toward the bottom wall of the countersunk hole.

5. The battery riveting end cap assembly as described in claim 2, characterized in that: The bottom of the riveting groove gradually extends downward from the outside to the inside to form a conical groove bottom.

6. The battery riveting end cap assembly as described in claim 1, characterized in that: It also includes a second insulating element disposed between the riveted pole and the end cap body.

7. The battery riveting end cap assembly as described in claim 6, characterized in that: The lower surface edge of the second insulating member is provided with a lower flange for limiting current collector and winding core.

8. The battery riveting end cap assembly as described in claim 6, characterized in that: The riveting pole includes a riveting pole head located on the side of the end cap body away from the riveting block, and the lower surface of the second insulating member is provided with a limiting protrusion wall protruding downward, and a limiting groove for accommodating the riveting pole head is formed between the limiting protrusion walls.

9. The battery riveting end cap assembly as described in claim 6, characterized in that: The upper surface of the second insulating member has one or more protrusions, and the lower surface of the end cap body has one or more limiting grooves that mate with the protrusions; or, The upper surface of the second insulating member is recessed with one or more limiting grooves, and the lower surface of the end cap body is provided with one or more protrusions that engage with the limiting grooves.

10. The battery riveting end cap assembly as described in claim 1, characterized in that: It also includes a sealing ring, which includes a first sealing portion sleeved on the riveting pole and located between the hole wall of the first through hole and the riveting pole, and a second sealing portion formed by bending outward from the lower side of the first sealing portion, the second sealing portion being disposed between the lower surface of the riveting pole and the end cap body.

11. The battery riveting end cap assembly as described in claim 10, characterized in that: The wall of the third through hole in the first insulating member extends to the side wall of the riveted pole, and a portion of the first insulating member is located directly above the first sealing part.

12. The battery riveting end cap assembly as described in claim 1, characterized in that: The outer side of the first insulating member has an upwardly protruding outer flange, and an annular rivet block receiving groove is formed between the outer flange and the insulating flange to accommodate the rivet block; the upper surface of the end cap body has an insulating member receiving groove to accommodate the first insulating member, and the first insulating member is at least partially accommodated in the insulating member receiving groove.

13. The battery riveting end cap assembly as described in claim 1, characterized in that: The top of the insulating flange has guide edges that gradually slope toward the middle of the insulating flange on both sides, so that the top of the insulating flange gradually shrinks.

14. A battery, characterized in that: The battery includes a battery casing, a battery cell, a current collector, and a battery riveting end cap assembly as described in any one of claims 1-13. The battery cell is installed inside the battery casing, the current collector is electrically connected to the battery cell and the riveting terminal, and the battery riveting end cap assembly is installed on the battery casing. The end cap body is the cover plate of the battery casing or is integrally formed on the bottom of the battery casing.

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