A reverse riveting battery cover plate structure and assembling method

Abstract

This invention discloses a reverse-riveted battery cover structure and assembly method, including a substrate and a stop frame disposed below the substrate. The substrate has a terminal hole, the bottom of the stop frame has a riveting block, and below the riveting block is a first connecting piece. The first connecting piece has a first through hole, the riveting block has a second through hole, and the stop frame has a third through hole. The first through hole, the second through hole, the third through hole, and the terminal hole form a riveting hole. The terminal has a through-hole and is riveted to the riveting block and the first connecting piece. In this invention, the first terminal, the stop frame, the riveting block, and the substrate are riveted together by the terminal. The width of the riveting block is greater than the width of the first terminal, and the first terminal protrudes outward relative to the riveting block. The riveted deformation portion of the terminal has a portion that contacts the riveting block and a portion that connects to the first terminal, further increasing the stability of the connection.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a reverse riveting battery cover structure and assembly method. Background Technology

[0002] With the development of power lithium batteries in my country, the technical requirements for battery top covers are becoming increasingly stringent. As the safety requirements for battery cells become higher and higher, the requirements for top covers are also becoming higher and higher. In order to improve the stability of the top cover structure and the overall safety and stability of power lithium batteries, the structure of the top cover must be improved.

[0003] A search revealed a Chinese patent, CN219677394U, entitled "Top Cover Structure, Power Battery and Electrical Equipment," which discloses a structure where the terminal post has a welded body and a riveted body. The riveted block is riveted to the riveted body on the terminal post, and the side of the riveted block away from the welded body is used for welding to the bare battery cell, effectively inverting the terminal post. When the welded body is connected to the busbar, this improves the current carrying capacity of the power battery. The drawback of this patent is that the battery electrodes still need to be fixed to the cover plate by welding or screws and electrically connected to the terminal post, which increases the complexity of the manufacturing process. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes a reverse riveting battery cover structure and assembly method.

[0005] This invention proposes a reverse-riveted battery cover structure, comprising a substrate and a stop frame disposed below the substrate. Unlike existing technologies, the substrate has a terminal hole, and the bottom of the stop frame has a riveting block made of copper. Below the riveting block is a first connecting piece with a first through hole, the riveting block has a second through hole, and the stop frame has a third through hole. The first through hole, the second through hole, the third through hole, and the terminal hole form a riveting hole. The terminal has a through riveting hole and is riveted to the riveting block and the first connecting piece.

[0006] Preferably, the width of the rivet block is greater than the width of the first connecting piece, and the first connecting piece protrudes outward relative to the rivet block. The rivet deformation portion of the pole has a portion that contacts the rivet block and a portion that connects to the first connecting piece.

[0007] As a further optimization of the present invention, the substrate has a downwardly protruding positioning portion, and the stop frame has a positioning groove that matches the positioning portion.

[0008] As a further optimization of the present invention, the bottom of the stop frame has a first positioning strip and a second positioning strip arranged parallel to each other, and the riveting block is located between the first positioning strip and the second positioning strip. The first positioning strip and the second positioning strip are used to limit the two opposite sides of the riveting block.

[0009] As a further optimization of the present invention, the diameter of the first through hole is larger than the diameter of the second through hole, and the diameter of the second through hole is larger than the diameter of the pole extending to the riveting hole, and the diameter of the third through hole is larger than the diameter of the second through hole.

[0010] As a further optimization of the present invention, a sealing element is provided inside the pole hole, and the pole penetrates the sealing element.

[0011] As a further optimization of the present invention, the substrate has a limiting groove coaxial with the pole hole, an insulating gasket is provided in the limiting groove, the top of the pole contacts the insulating gasket, and the sealing member is sleeved in the insulating gasket.

[0012] As a further optimization of the present invention, the pole post includes an upper limit part and a riveting part, the outer diameter of the upper limit part is larger than the outer diameter of the riveting part, and the riveting part passes through a riveting hole.

[0013] As a further optimization of the present invention, the riveting part has a first riveting part, a second riveting part, and a third riveting part that are coaxially fixedly connected. The second riveting part is located between the first riveting part and the third riveting part. The first riveting part is connected to the sealing element, the second riveting part is opposite to the stop bracket, and the third riveting part is connected to the first connecting piece and has a portion extending out of the riveting hole. The hardness of the third riveting part is less than the hardness of the second riveting part, and the hardness of the second riveting part is less than the hardness of the first riveting part.

[0014] As a further optimization of the present invention, there is a filling gap between the second riveting part and the stop bracket, and the end face of the third riveting part has a deformation hole, the depth of which extends to a portion of the second riveting part.

[0015] A method for assembling a reverse-riveted battery cover, used for assembling the aforementioned reverse-riveted battery cover, includes the following steps:

[0016] First, place the stop bracket relative to the base plate for positioning, then place the riveting block and the first connecting piece to realize that the first through hole, the second through hole, the third through hole and the pole hole are aligned and coaxially form a riveting hole;

[0017] Then, the lower end of the pole is passed through the riveting hole, and while it is against the side of the base plate away from the stop bracket, it is also against the side of the pole away from the first connecting piece. The part of the pole extending out of the first connecting plate is tapped to rivet the pole to the first connecting plate and the riveting block.

[0018] In this invention, the proposed reverse riveting battery cover structure and assembly method involves riveting the first connecting piece, the stop frame, the riveting block, and the substrate together via a pole post. The width of the riveting block is greater than the width of the first connecting piece, and the first connecting piece protrudes outward relative to the riveting block. The riveting deformation portion of the pole post has a portion that contacts the riveting block and a portion that connects to the first connecting piece, further increasing the stability of the connection.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention from another angle;

[0023] Figure 4 This is a cross-sectional view of the present invention;

[0024] In the figure: 1. Base plate; 10. Pole post hole; 11. Positioning part; 12. Limiting groove; 2. Stop frame; 20. Third through hole; 21. Positioning groove; 3. Pole post; 30. Upper limit part; 300. Axial deformation ring groove; 31. Riveting part; 310. First riveting part; 311. Second riveting part; 312. Third riveting part; 3120. Deformation hole; 4. Riveting block; 40. Second through hole; 5. First connecting piece; 50. First through hole; 6. First positioning strip; 7. Second positioning strip; 8. Insulating gasket; 80. Limiting ring; 9. Sealing element; 90. Connecting part; 91. Extension part; 13. Explosion-proof valve; 14. Second pole piece. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figures 1-4The diagram illustrates a reverse-riveted battery cover structure, comprising a substrate 1 and a stop frame 2 disposed below the substrate 1. The stop frame 2 is made of a non-conductive material, while the substrate 1 is made of metal. The substrate 1 has terminal hole 10. A riveting block 4, made of copper, is located at the bottom of the stop frame 2. A first connecting piece 5, with a first through hole 50, a second through hole 40, and a third through hole 20, are located below the riveting block 4. The first through hole 50, the second through hole 40, the third through hole 20, and the terminal hole 10 form a riveting hole. The terminal 3 has a through-hole and is riveted to the riveting block 4 and the first connecting piece 5. The riveted terminal 3 has a portion that contacts the riveting block 4 and a portion that contacts the first connecting piece 5.

[0027] In the actual installation process, the stop frame 2 is first positioned relative to the base plate 1, and then the rivet block 4 and the first connecting piece 5 are placed to make the first through hole 50, the second through hole 40, the third through hole 20 and the pole hole 10 align and coaxially form a rivet hole. Then, the lower end of the pole 3 passes through the rivet hole, and while it is against the side of the base plate 1 away from the stop frame 2, it is also against the side of the pole 3 away from the first connecting piece 5. The part of the pole 3 extending out of the first connecting plate is tapped to make the pole 3 rivet with the first connecting plate and the rivet block 4, so that the pole 3 and the first connecting piece 5 are electrically connected and the stop frame 2 is fixed at the same time. Specifically, the width of the rivet block 4 is greater than the width of the first connecting piece, and the first connecting piece protrudes outward relative to the rivet block 4. The riveted deformation part of the pole 3 has a part that contacts the rivet block 4 and a part that connects with the first connecting piece.

[0028] Preferably, in order to further facilitate the positioning of the stop frame 2 relative to the base plate 1, the base plate 1 has a downwardly protruding positioning part 11. Specifically, the positioning part 11 is square, and the stop frame 2 has a positioning groove 21 that matches the positioning part 11. During the installation of the stop frame 2, the relative position of the third through hole 20 and the pole post hole 10 is determined by the matching of the positioning groove 21 and the positioning part 11.

[0029] Preferably, in order to achieve the positioning of the further riveting block 4, the bottom of the stop frame 2 has a first positioning strip 6 and a second positioning strip 7 arranged in parallel with each other, the riveting block 4 is located between the first positioning strip 6 and the second positioning strip 7, and the first positioning strip 6 and the second positioning strip 7 are used to limit the two opposite sides of the riveting block 4.

[0030] Preferably, the diameter of the first through hole 50 is larger than the diameter of the second through hole 40, and the diameter of the second through hole 40 is larger than the diameter of the pole post 3 extending to the riveting hole. The diameter of the third through hole 20 is larger than the diameter of the second through hole 40. This makes the deformation of the part of the pole post 3 in the riveting hole in the first through hole 50 and the deformation in the third through hole 20 greater than the deformation in the second through hole 40. In this way, even if the deformation of the pole post 3 in the third through hole 20 is relatively large during the riveting process, the relative position of the stop frame 2 and the base plate 1 can be guaranteed.

[0031] Preferably, after the pole post 3 is riveted, in order to further ensure the stability of the connection of the connecting piece, the connecting piece and the riveting block 4 can be welded to further strengthen the stability of the connection of the connecting piece.

[0032] Preferably, a sealing element 9 is provided inside the pole hole 10, the pole 3 penetrates the sealing element 9 and the outer diameter of the pole 3 is equal to the diameter of the hole of the sealing element 9.

[0033] Preferably, the substrate 1 has a limiting groove 12 coaxial with the pole hole 10, and an insulating gasket 8 is provided in the limiting groove 12. The top of the pole 3 contacts the insulating gasket 8, and the sealing member 9 is sleeved in the insulating gasket 8. This further avoids contact between the substrate 1 and the pole 3.

[0034] Preferably, the insulating pad 8 has a limiting ring 80 located outside the limiting groove 12 and above the substrate 1, further ensuring that the pole post 3 does not contact the substrate 1.

[0035] Preferably, the sealing element 9 has a T-shaped structure. The sealing element 9 includes an integrally formed connecting part 90 and an extension part 91. The extension part 91 is located above the connecting part 90 and the outer diameter of the extension part 91 is larger than the outer diameter of the connecting part 90. The connecting part 90 is located inside the pole hole 10. The inner diameter of the insulating gasket 8 is larger than the outer diameter of the extension part 91. The lower end face of the extension part 91 contacts the bottom surface of the limiting groove 12, and a radial deformation gap is formed between the extension part 91 and the insulating gasket 8.

[0036] Based on the above scheme, preferably, the pole post 3 includes an upper limit part 30 and a riveting part 31. The outer diameter of the upper limit part 30 is larger than the outer diameter of the riveting part 31. The riveting part 31 passes through the riveting hole. The upper limit part 30 is located above the insulating gasket 8 and contacts the insulating gasket 8. Preferably, an axial deformation annular groove 300 is opened below the upper limit part 30. The sealing member 9 is opposite to the axial deformation annular groove 300, which ensures the connection is stable while ensuring that the pole post 3 does not contact the substrate 1.

[0037] Preferably, the insulating pad 8 has a snap-fit ​​ring groove that matches the upper limit part 30 of the pole post 3. The diameter of the snap-fit ​​ring groove is larger than the inner diameter of the insulating pad 8, which further ensures the connection stability while ensuring that the pole post 3 does not contact the substrate 1, and is easy to process.

[0038] Preferably, the riveting part 31 has a first riveting part 310, a second riveting part 311, and a third riveting part 312 that are coaxially fixedly connected. The second riveting part 311 is located between the first riveting part 310 and the third riveting part 312. The first riveting part 310 is connected to the sealing member 9. The second riveting part 311 is opposite to the stop bracket 2. The third riveting part 312 is connected to the first connecting piece and the riveting block. The third riveting part 312 has a portion extending out of the riveting hole. The hardness of the third riveting part 312 is less than the hardness of the second riveting part 311. The hardness of the second riveting part 311 is less than the hardness of the first riveting part 310. During the riveting process, the deformation of the third riveting part 312 is greater than that of the second riveting part 311, and the deformation of the second riveting part 311 is greater than that of the first riveting part 310. In this process, the sealing element 9 is squeezed and deformed to ensure the stability of the connection between the riveting part 31 and the sealing element 9, the stop frame 2, the pole piece and the riveting block 4.

[0039] Preferably, based on the above scheme, the second riveting part 311 and the stop bracket 2 have a filling gap, and the end face of the third riveting part 312 has a deformation hole 3120, the depth of which extends into a portion of the second riveting part 311. To further ensure the stability of the riveting, preferably, the diameter of the deformation hole 3120 located in the second riveting part 311 gradually decreases from the end near the riveting block 4 to the end away from the riveting block 4.

[0040] Based on the above embodiment, an explosion-proof valve 13 is installed on the substrate 1, and the stop frame 2 has a portion opposite to the explosion-proof valve 13. The portion of the stop frame 2 opposite to the explosion-proof valve 13 has multiple non-connected ventilation channels.

[0041] As with existing technologies, a second electrode 14 is provided at the bottom of the substrate 1.

[0042] As a preferred embodiment, a method for assembling a reverse-riveted battery cover structure includes the following steps:

[0043] S1. Weld the explosion-proof valve 13 onto the substrate 1;

[0044] S2. An insulating gasket 8 is placed in the limiting groove 12 of the substrate 1, and a sealing member 9 is fitted inside the insulating gasket 8. The end face of the extension portion 91 of the sealant contacts the bottom surface of the limiting groove 12, and the connecting portion 90 of the sealing member 9 extends into the riveting hole. Then, the pole post 3 is inserted into the sealing member 9 and the insulating gasket 8. During this process, the sealing member 9 deforms and clamps the pole post 3 until the upper limit portion 30 of the pole post 3 abuts against the snap ring groove of the insulating gasket 8.

[0045] S3. Invert the substrate 1, and simultaneously support and limit the ends of the pole post 3 and the insulating pad 8 by the clamp. Place the stop frame 2 on the substrate 1. The pole post 3 passes through the third through hole 20 of the stop frame 2 and makes the positioning part 11 of the brake match the positioning groove 21 of the stop frame 2. Then place the rivet block 4 on the stop frame 2. The pole post 3 passes through the rivet block 4. Place the first connecting piece 5 on the rivet block 4. The pole post 3 passes through the connecting piece.

[0046] S4. Under the action of external force, the end of the pole post 3 away from the insulating pad 8 is squeezed and the part of the pole post 3 extending out of the first connecting piece 5 is deformed and the deformed pole post 3 comes into contact with the first connecting piece 5 and the riveting block 4.

[0047] S5. Weld the second connecting piece.

[0048] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A reverse-riveted battery cover structure, comprising a base plate (1) and a stop frame (2) disposed below the base plate (1), characterized in that, The substrate (1) has a pole hole (10), the bottom of the stop frame (2) is provided with a rivet block (4), the bottom of the rivet block (4) is provided with a first connecting piece (5), the first connecting piece (5) has a first through hole (50), the rivet block (4) has a second through hole (40), the stop frame (2) has a third through hole (20), the first through hole (50), the second through hole (40), the third through hole (20) and the pole hole (10) form a rivet hole, the pole (3) has a through rivet hole and is riveted to the rivet block (4) and the first connecting piece (5); The diameter of the first through hole (50) is larger than the diameter of the second through hole (40), and the diameter of the second through hole (40) is larger than the diameter of the pole post (3) extending to the riveting hole, and the diameter of the third through hole (20) is larger than the diameter of the second through hole (40). A sealing element (9) is provided inside the pole hole (10), and the pole (3) passes through the sealing element (9); The pole post (3) includes an upper limit part (30) and a riveting part (31). The outer diameter of the upper limit part (30) is larger than the outer diameter of the riveting part (31). The riveting part (31) passes through the riveting hole. The riveting part (31) has a first riveting part (310), a second riveting part (311) and a third riveting part (312) coaxially fixedly connected. The second riveting part (311) is located between the first riveting part (310) and the third riveting part (312). The first riveting part (310) is connected to the sealing member (9). The second riveting part (311) is connected to the riveting block (4). The third riveting part (312) is connected to the first connecting piece (5) and has a portion extending out of the riveting hole. The hardness of the third riveting part (312) is less than the hardness of the second riveting part (311). The hardness of the second riveting part (311) is less than the hardness of the first riveting part (310). The second riveting part (311) has a filling gap with the stop bracket (2), and the end face of the third riveting part (312) has a deformation hole (3120) that extends to a portion of the second riveting part (311). There is a filling gap between the second riveting part (311) and the stop bracket (2), and the end face of the third riveting part (312) has a deformation hole (3120) extending to the part of the second riveting part (311).

2. The reverse-riveted battery cover structure according to claim 1, characterized in that, The substrate (1) has a downwardly protruding positioning part (11), and the stop frame (2) has a positioning groove (21) that matches the positioning part (11).

3. The reverse-riveted battery cover structure according to claim 1, characterized in that, The bottom of the stop frame (2) has a first positioning strip (6) and a second positioning strip (7) arranged parallel to each other. The rivet block (4) is located between the first positioning strip (6) and the second positioning strip (7). The first positioning strip (6) and the second positioning strip (7) are used to limit the two opposite sides of the rivet block (4).

4. The reverse-riveted battery cover structure according to claim 1, characterized in that, The substrate (1) has a limiting groove (12) coaxial with the pole hole (10), and an insulating gasket (8) is provided in the limiting groove (12). The top of the pole (3) contacts the insulating gasket (8), and the sealing member (9) is sleeved in the insulating gasket (8).

5. A method for assembling a battery cover plate by reverse riveting, characterized in that, The assembly of the reverse-riveted battery cover as described in any one of claims 1-4 includes the following steps: First, place the stop bracket (2) relative to the base plate (1) for positioning, and then place the riveting block (4) and the first connecting piece (5) to realize that the first through hole (50), the second through hole (40), the third through hole (20) and the pole hole (10) are opposite and coaxial to form a riveting hole; Then, the lower end of the pole post (3) is passed through the riveting hole, and the pole post (3) is simultaneously contacted on the side of the base plate (1) away from the stop frame (2) and on the side of the pole post (3) away from the first connecting piece (5). The part of the pole post (3) extending out of the first connecting plate is struck to rivet the pole post (3) with the first connecting plate and the riveting block (4).

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