Combined battery case

Abstract

The utility model relates to the technical field of power batteries, and specifically to a combined battery shell, including a shell, a rivet and a sealing assembly, wherein the shell is provided with an inner spacer on the inner wall surface at the mounting hole, and the shell is provided with an outer spacer on the outer wall surface and side wall at the mounting hole, the rivet includes an inner riveted end formed before assembly and an outer riveted end formed during assembly, the rivet passes through the mounting hole from the inside of the shell until the inner riveted end presses the inner spacer on the inner wall surface of the shell, the part of the rivet passing through the mounting hole is cold-forged and flanging to form an outer riveted end, and the sealing assembly includes a sealing pin pressed on the outer riveted end and a metal gasket configured on the outer spacer and matched with the sealing pin. The utility model solves the technical problems in the prior art that the riveting process of the battery combination shell is uncontrolled, which easily leaves metal fragments in the battery shell, the mating surface cannot be compacted, and the sealing effect of the sealing pin and the rivet is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a combined battery shell. Background Art

[0002] Power batteries are high-performance batteries designed for power systems to provide a power source. They are usually used in electric vehicles, electric trains, electric bicycles, golf carts, etc. At present, the connection method of combined battery shells is relatively complicated. Rivets need to be cold-forged on both sides of the battery shell, which is easy to leave metal fragments in the shell. The shape of the riveted surface of the rivet is complex, especially the outer end face of the shell, which requires multiple cold forgings. The riveted shape after cold forging is uncontrolled, resulting in failure to compact during sealing and contact short circuit. At the same time, there is also the problem of poor sealing effect of subsequent sealing nails and rivets. Utility Model Content

[0003] In order to solve the technical problems in the prior art that the riveting process of the battery combination shell is uncontrolled, which easily leads to metal fragments being left in the battery shell, the mating surfaces cannot be compacted, and the sealing effect of the sealing pins and rivets is poor, the present application proposes a combined battery shell to solve the above technical problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The utility model provides a combined battery shell, comprising: a shell, one end of which is provided with a mounting hole, the shell is provided with an inner isolating member on the inner wall surface at the mounting hole, and at the same time, the shell is provided with an outer isolating member on the outer wall surface and side wall at the mounting hole; a rivet, the rivet is assembled at the mounting hole, the rivet comprises an inner riveted end that has been formed before assembly and an outer riveted end that is formed during assembly, the rivet passes through the mounting hole from the inside of the shell until the inner riveted end presses the inner isolating member onto the inner wall surface of the shell, the part of the rivet that passes through the mounting hole is cold-forged and flanging to form the outer riveted end, and the outer riveted end presses the outer isolating member onto the outer wall surface of the shell; a sealing assembly, the sealing assembly comprises a sealing nail pressed onto the outer riveted end and a metal gasket arranged on the outer isolating member and matched with the sealing nail, the sealing nail is connected to the metal gasket to seal the outer riveted end.

[0006] Furthermore, the outer edge of the metal gasket extends axially away from the shell to form a receiving area, and the external riveted end after cold heading is accommodated in the receiving area.

[0007] Furthermore, an embedding groove is formed on the outer edge of the metal gasket to embed the outer edge of the flange of the sealing pin.

[0008] Furthermore, the side surface of the external riveted end is welded to the inner wall of the receiving area of ​​the metal gasket.

[0009] Furthermore, the flange outer edge of the sealing pin is welded to the metal gasket to form a welding point.

[0010] Furthermore, the connection area between the sealing pin and the outside protrudes away from the shell to form a connection ring, and the protruding height of the connection ring is higher than the welding point between the flange outer edge of the sealing pin and the metal gasket.

[0011] Furthermore, the outer edge of the outer isolation member forms a barrier to position the metal gasket.

[0012] Furthermore, a protruding positioning rib extending axially is formed on the inner isolation member, and the positioning rib wraps around the side surface of the inner riveted end.

[0013] Furthermore, it also includes a sealing member, which is arranged on the inner wall surface of the mounting hole and is clamped by the outer isolating member, the rivet, the inner isolating member and the shell.

[0014] Furthermore, the sealing member is fitted with a side surface of the inner isolating member, and the fitting surface is an inclined surface.

[0015] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0016] The combined battery shell of the utility model comprises an internal riveted end formed before assembly and an external riveted end formed during assembly. The riveted end passes through the mounting hole from the inside of the shell until the internal riveted end presses the inner isolation piece onto the inner wall surface of the shell. The part of the riveted end passing through the mounting hole is cold headed to form the external riveted end. The internal riveted end is formed before assembly and no metal fragments are left in the shell. Meanwhile, the external riveted end only needs to be cold headed and flanging once during assembly. The shape after cold headed is easy to control, ensuring compaction of the mating surface. The cold heading process of the external riveted end occurs outside the shell, and the metal fragments generated in the process will not enter the shell. On the other hand, a metal gasket is arranged on the external isolation member, and the sealing pin is connected with the metal gasket to seal the external riveted end of the riveted part, thereby ensuring the sealing of the sealing pin and the riveted part, and the entire connection structure is more stable. In summary, the technical problems of the uncontrolled riveting process of the combined battery pack shell in the prior art, such as the easy leaving of metal fragments in the battery shell, the inability to compact the mating surface, and the poor sealing effect of the sealing pin and the rivet, are solved;

[0017] In the combined battery shell of the utility model, the connection area between the sealing nail and the outside protrudes away from the shell to form a connecting ring. Since the terminal welding area is on the connecting ring, even if the welding point protrudes slightly, the protruding height of the connecting ring is higher than the welding point between the flange outer edge of the sealing nail and the metal gasket, which does not affect the terminal use and makes the performance of the terminal product more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the combined battery shell of the utility model.

[0019] Among them: 1-shell; 2-inner isolation part, 21-positioning rib; 3-outer isolation part, 31-enclosure; 4-riveted part, 41-inner riveted end, 42-outer riveted end; 5-metal gasket; 6-sealing pin, 61-connecting ring; 7-sealing part. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] like Figure 1 As shown, the utility model provides a combined battery pack shell, including a shell 1, a rivet 4 and a sealing assembly. A mounting hole is opened at one end of the shell 1. The shell 1 is provided with an inner isolating member 2 on the inner wall surface at the mounting hole. The shell 1 is provided with an outer isolating member 3 on the outer wall surface and side wall at the mounting hole. The rivet 4 is assembled at the mounting hole. The rivet 4 includes an inner rivet end 41 formed before assembly and an outer rivet end 42 formed during assembly. The rivet 4 passes through the mounting hole from the inside of the shell 1. Until the internal riveted end 41 presses the internal isolation part 2 onto the inner wall surface of the shell 1, the part of the riveted part 4 that passes through the mounting hole is cold headed and flanging to form an external riveted end 42, and the external riveted end 42 presses the external isolation part 3 onto the outer wall surface of the shell 1. The sealing assembly includes a sealing pin 6 pressed onto the external riveted end 42 and a metal gasket 5 arranged on the external isolation part 3 and cooperating with the sealing pin 6. The sealing pin 6 is connected to the metal gasket 5 to seal the external riveted end 42, so that the entire connection structure is more stable.

[0022] In the combined battery shell of the utility model, the rivet part 4 includes an internal rivet end 41 that has been formed before assembly and an external rivet end 42 that is formed during the assembly process. The rivet part 4 passes through the mounting hole from the inside of the shell 1 until the internal rivet end 41 presses the inner isolation member 2 onto the inner wall surface of the shell 1. The part of the rivet part 4 that passes through the mounting hole is cold-forged to form the external rivet end 42. The internal rivet end 41 has been formed before assembly, and no metal fragments will be left in the shell 1. At the same time, the external rivet end 42 only needs to be cold-forged and flanging once during the assembly process. The shape after cold-forging is easy to control, ensuring the matching surface The outer riveting end 42 is compacted, and the cold heading process of the outer riveting end 42 occurs outside the shell 1, and the metal fragments generated in the process will not enter the shell 1. On the other hand, a metal gasket 5 is arranged on the outer isolator 3, and the sealing nail 6 is connected with the metal gasket 5 to seal the outer riveting end 42 of the rivet 4, thereby ensuring the sealing performance of the sealing nail 6 and the rivet 4, and the whole connection structure is more stable. In summary, the technical problems of the uncontrolled riveting process of the combined battery pack shell in the prior art, which easily leaves metal fragments in the battery shell, the mating surface cannot be compacted, and the poor sealing effect of the sealing nail 6 and the rivet are solved.

[0023] Specifically, the outer edge of the metal gasket 5 extends away from the housing 1 along the axial direction to form a receiving area, and the external riveted end 42 after cold heading is received in the receiving area.

[0024] Furthermore, an embedding groove is formed on the outer edge of the metal gasket 5 so that the flange outer edge of the sealing pin 6 can be embedded therein.

[0025] When the combined battery pack shell of the utility model is specifically connected, the side surface of the external riveted end 42 is welded to the inner wall of the receiving area of ​​the metal gasket 5 .

[0026] Furthermore, the flange outer edge of the sealing pin 6 is welded to the metal gasket 5 to form a welding point.

[0027] In order not to affect the terminal use, the connection area between the sealing pin 6 and the outside protrudes away from the shell 1 to form a connecting ring 61. The protruding height of the connecting ring 61 is higher than the welding point between the flange edge of the sealing pin 6 and the metal gasket 5. Since the terminal welding area is on the connecting ring 61, even if the welding point protrudes slightly, the protruding height of the connecting ring 61 is higher than the welding point between the flange edge of the sealing pin 6 and the metal gasket 5, which does not affect the terminal use.

[0028] In a specific embodiment of the present invention, the outer edge of the outer isolation member 3 forms a barrier 31 to position the metal gasket 5 .

[0029] In a specific implementation of the utility model, an axially extending protruding positioning rib 21 is formed on the inner isolating member 2. The positioning rib 21 wraps around the side of the internal riveted end 41, which can be used for positioning when the riveted member 4 is assembled, thereby reducing the difficulty of assembly.

[0030] In a specific implementation of the present invention, a sealing member 7 is further included. The sealing member 7 is arranged on the inner wall surface of the mounting hole and is clamped by the outer isolating member 3 , the rivet member 4 , the inner isolating member 2 and the housing 1 .

[0031] Furthermore, the seal 7 is fitted with the side of the inner isolator 2, and the fitting surface is an inclined surface, so that the inner isolator 2 forms a sloped portion, and correspondingly, a sloped space is formed for the seal 7 to deform and move. In this way, even if the seal 7 is not completely moved into place, there is still a sloped portion formed by the isolator between the rivet 4 and the shell 1 for insulation, avoiding the formation of a direct gap between the rivet 4 and the shell 1, thereby improving the insulation of the finished battery.

[0032] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A combined battery case, characterized in that: include: A shell (1), wherein one end of the shell (1) is provided with a mounting hole, an inner wall surface of the shell (1) at the mounting hole is provided with an inner isolating member (2), and an outer wall surface and a side wall of the shell (1) at the mounting hole are provided with an outer isolating member (3); A rivet (4), the rivet (4) being assembled at the mounting hole, the rivet (4) comprising an internal rivet end (41) formed before assembly and an external rivet end (42) formed during assembly, the rivet (4) passing through the mounting hole from the inside of the shell (1) until the internal rivet end (41) presses the inner isolating member (2) onto the inner wall surface of the shell (1), the portion of the rivet (4) passing through the mounting hole is cold-forged and flanging to form the external rivet end (42), and the external rivet end (42) presses the outer isolating member (3) onto the outer wall surface of the shell (1); A sealing assembly, comprising a sealing pin (6) pressed onto the external riveted end (42) and a metal gasket (5) arranged on the external isolation member (3) and cooperating with the sealing pin (6), wherein the sealing pin (6) is connected to the metal gasket (5) to seal the external riveted end (42).

2. The combined battery case according to claim 1, characterized in that: The outer edge of the metal gasket (5) extends axially away from the housing (1) to form a receiving area, and the external riveted end (42) formed by cold heading is accommodated in the receiving area.

3. The combined battery case according to claim 2, characterized in that: An embedding groove is formed on the outer edge of the metal gasket (5) so that the outer edge of the flange of the sealing pin (6) can be embedded.

4. The combined battery case according to claim 2, characterized in that: The side surface of the external riveted end (42) is welded to the inner wall of the receiving area of ​​the metal gasket (5).

5. The combined battery case according to claim 3, characterized in that: The flange outer edge of the sealing pin (6) is welded to the metal gasket (5) to form a welding point.

6. The assembled battery case according to claim 5, characterized in that: The connection area between the sealing pin (6) and the outside protrudes away from the shell (1) to form a connection ring (61), and the protruding height of the connection ring (61) is higher than the welding point between the flange outer edge of the sealing pin (6) and the metal gasket (5).

7. The assembled battery case according to claim 1, characterized in that: The outer edge of the outer isolating member (3) forms a barrier (31) to position the metal gasket (5).

8. The assembled battery case according to claim 1, characterized in that: An axially extending protruding positioning rib (21) is formed on the inner isolation member (2), and the positioning rib (21) wraps around the side surface of the inner riveted end (41).

9. The assembled battery case according to claim 1, characterized in that: It also includes a sealing member (7), which is arranged on the inner wall surface of the mounting hole and is clamped by the outer isolating member (3), the riveting member (4), the inner isolating member (2) and the shell (1).

10. The assembled battery case according to claim 9, characterized in that: The sealing member (7) is fitted to the side surface of the inner isolating member (2), and the fitting surface is an inclined surface.

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