A power battery shell

Abstract

The utility model relates to the technical field of power batteries, and specifically to a power battery shell, comprising a shell and an inner isolator, wherein one end of the shell is provided with a mounting hole, the wall of the shell at the mounting hole is folded inwardly of the shell to form a chamfer and a protrusion, the inner isolator is attached to the inner wall surface of the shell, and a portion of the inner isolator extends along the mounting hole toward the outer wall surface of the shell, and envelops the chamfer and the protrusion. The utility model solves the technical problem that the finished battery is prone to short circuit due to unreasonable structural design between the shell, rivets or isolators in the prior art.

Description

Technical Field

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

[0002] New energy vehicle batteries are the core components of electric vehicles. They provide the power required for vehicle operation. Currently, new energy vehicles on the market mainly use chemical batteries as power sources. These chemical batteries can be divided into two categories: batteries and fuel cells. Batteries are suitable for pure electric vehicles, including lead-acid batteries, nickel-metal hydride batteries, sodium-sulfur batteries, secondary lithium batteries (such as lithium-ion batteries, lithium polymer batteries), air batteries, ternary lithium batteries, etc., while fuel cells are dedicated to fuel cell electric vehicles, such as alkaline fuel cells. Power batteries account for 30% to 40% of the cost of the whole vehicle. They are one of the most important systems in new energy vehicles and are also key components that distinguish them from traditional fuel vehicles. At present, power batteries are prone to short circuits in finished batteries due to unreasonable structural design between the shell, rivets or separators. Utility Model Content

[0003] In order to solve the technical problem in the prior art that the finished power battery is prone to short circuit due to unreasonable structural design between the shell, rivets or isolation parts, the present application proposes a power battery shell that solves the above technical problem.

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

[0005] The utility model provides a power battery shell, comprising: a shell, one end of which is provided with a mounting hole, and the wall of the shell at the mounting hole is folded inwardly of the shell to form a chamfer and a protrusion; an inner isolator, the inner isolator is attached to the inner wall surface of the shell, and a portion of the inner isolator extends along the mounting hole toward the outer wall surface of the shell and envelops the chamfer and the protrusion.

[0006] Furthermore, it also includes an outer isolating member, which is attached to the outer wall of the shell and adjacent to the inner isolating member.

[0007] Furthermore, it also includes a gasket, which is arranged outside the shell and presses the outer isolation member and the inner isolation member onto the shell.

[0008] Furthermore, it also includes a rivet assembled at the mounting hole of the shell, the rivet includes an internal riveted end that has been formed before assembly and an external riveted end that is formed during the assembly process, the rivet passes through the mounting hole from the inside of the shell until the internal riveted end presses the inner insulation member onto the inner wall surface of the shell, the rivet portion passing through the mounting hole is cold headed and flanging to form the external riveted end, and the external riveted end is pressed onto the gasket, so as to press the outer insulation member and the inner insulation member onto the outer wall surface of the shell through the gasket.

[0009] Furthermore, a receiving area is formed at the inner circle of the gasket for receiving the external riveted end of the rivet, and the gasket in the receiving area is welded to the external riveted end.

[0010] Furthermore, it also includes a sealing pin, wherein a receiving groove is formed at the inner circle of the external riveted end of the rivet, the sealing pin is assembled in the receiving groove, and the external riveted end in the receiving groove is seal-welded to the sealing pin.

[0011] Furthermore, a flange ring is formed on the sealing pin and is assembled into the receiving groove.

[0012] Furthermore, it also includes a current collecting plate, which is arranged inside the shell and connected to the inner isolation piece of the rivet by penetration welding.

[0013] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0014] In the power battery shell of the utility model, the wall of the shell at the mounting hole is folded inwardly of the shell to form a chamfer and a protrusion, the inner separator is attached to the inner wall surface of the shell, and part of the inner separator extends along the mounting hole toward the outer wall surface of the shell and envelops the chamfer and the protrusion. The chamfer design can make the inner separator arranged at the chamfer thicker, that is, increase the insulation distance. At the same time, the protrusion can make the fit between the inner separator and the shell better, specifically, more compact and better sealed, thereby solving the technical problem that the finished battery is prone to short circuit due to unreasonable structural design between the shell, rivets or separators in the power battery in the prior art;

[0015] In order to prevent the technical problems of rivets not being compacted and debris being left in the shell during the riveting process, the power battery shell of the utility model is assembled at the mounting hole of the shell, and the rivet includes an internal riveting end that has been formed before assembly and an external riveting end that is formed during the assembly process. The rivet passes through the mounting hole from the inside of the shell until the internal riveting end presses the inner insulation piece onto the inner wall surface of the shell, and the rivet portion passing through the mounting hole is cold headed and flanging to form an external riveted end, and the external riveted end is pressed onto a gasket to press the outer insulation piece and the inner insulation piece onto the outer wall surface of the shell through the gasket. The internal riveted end of the rivet has been formed before assembly, and no metal fragments will be left in the shell. At the same time, the external riveted end only needs to be cold headed and flanging once during the assembly process, and the shape after cold heading is easy to control to ensure that the mating surface is compacted, and the cold heading process of the external riveted end occurs outside the shell, and the metal fragments generated during the process will not enter the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the power battery shell of the utility model.

[0017] Among them: 1-shell, 11-chamfer, 12-protrusion; 2-inner isolation member; 3-outer isolation member; 4-gasket, 41-receiving area; 5-rivet, 51-inner riveted end, 52-outer riveted end, 53-receiving groove; 6-sealing pin, 61-flange ring; 7-collecting plate. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1 As shown, the utility model provides a power battery shell, including a shell 1 and an inner isolator 2, wherein a mounting hole is opened at one end of the shell 1, and the wall of the shell 1 at the mounting hole is folded inwardly of the shell 1 to form a chamfer 11 and a protrusion 12, and the inner isolator 2 is attached to the inner wall surface of the shell 1, and a portion of the inner isolator 2 extends along the mounting hole toward the outer wall surface of the shell 1 and envelops the chamfer 11 and the protrusion 12.

[0020] Specifically, it also includes an outer isolating member 3 , which is attached to the outer wall of the shell 1 and is adjacent to the inner isolating member 2 .

[0021] In order to facilitate welding for downstream enterprises and improve the supporting strength, the power battery case of the utility model further includes a gasket 4, which is arranged outside the shell 1, and presses the outer separator 3 and the inner separator 2 onto the shell 1. Specifically, the gasket 4 can cooperate with the rivet 5, the inner separator 2, and the outer separator 3 to improve the overall assembly strength. At the same time, the side of the gasket 4 away from the shell 1 can facilitate the welding of the bar by downstream customers.

[0022] In order to prevent the rivet 5 from not being compacted and the technical problem of debris being left in the shell 1 during the riveting process, the rivet 5 of the power battery shell of the utility model adopts a process of passing through the inside of the shell 1 and then flanging the shell 1. Specifically, the rivet 5 is assembled at the mounting hole of the shell 1, and the rivet 5 includes an internal riveting end 51 that has been formed before assembly and an external riveting end 52 formed during the assembly process. The rivet 5 passes through the mounting hole from the inside of the shell 1 until the internal riveting end 51 presses the inner insulation 2 onto the inner wall surface of the shell 1, and the part of the rivet 5 passing through the mounting hole is cold-forged and flanging to form the external riveting end 52, and the external riveting end 52 is pressed onto the gasket 4 to press the outer insulation 3 and the inner insulation 2 onto the outer wall surface of the shell 1 through the gasket 4.

[0023] In the power battery shell of the utility model, the internal riveted end 51 of the rivet 5 has been formed before assembly, and no metal fragments will be left in the shell 1. At the same time, the external riveted end 52 only needs to be cold-forged and flanging once during the assembly process. The shape after cold-forging is easy to control to ensure that the mating surface is compacted. Moreover, the cold-forging process of the external riveted end 52 occurs outside the shell 1, and the metal fragments generated during the process will not enter the inside of the shell 1.

[0024] In a specific embodiment of the present invention, a receiving area 41 is formed at the inner circle of the gasket 4 for receiving the external riveted end 52 of the rivet 5 , and the gasket 4 in the receiving area 41 is welded to the external riveted end 52 .

[0025] The power battery shell of the utility model also includes a sealing nail 6. In order to reduce the influence of riveting on welding, a receiving groove 53 is formed at the inner circle of the external riveting end 52 of the rivet 5. The sealing nail 6 is assembled in the receiving groove 53, and the external riveting end 52 in the receiving groove 53 is seal-welded with the sealing nail 6.

[0026] Furthermore, a flange ring 61 is formed on the sealing pin 6 and is assembled into the receiving groove 53 .

[0027] In a specific embodiment of the present invention, a current collecting plate 7 is further included. The current collecting plate 7 is disposed inside the housing 1 and is connected to the inner isolation member 2 of the rivet 5 by penetration welding.

[0028] 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 power battery shell, characterized in that: include: A shell (1), wherein a mounting hole is formed at one end of the shell (1), and a wall of the shell (1) at the mounting hole is folded inwardly of the shell (1) to form a chamfer (11) and a protrusion (12); An inner isolator (2), the inner isolator (2) being attached to the inner wall surface of the shell (1), and a portion of the inner isolator (2) extending along the mounting hole toward the outer wall surface of the shell (1) and enveloping the chamfer (11) and the protrusion (12).

2. The power battery shell according to claim 1, characterized in that: It also comprises an outer isolating member (3), wherein the outer isolating member (3) is attached to the outer wall of the shell (1) and is adjacent to the inner isolating member (2).

3. The power battery shell according to claim 2, characterized in that: It also comprises a gasket (4), which is arranged outside the shell (1) and presses the outer isolating member (3) and the inner isolating member (2) onto the shell (1).

4. The power battery shell according to claim 3, characterized in that: It also includes a rivet (5) assembled at the mounting hole of the shell (1), the rivet (5) including an internal riveting end (51) that has been formed before assembly and an external riveting end (52) that is formed during the assembly process, the rivet (5) passes through the mounting hole from the inside of the shell (1) until the internal riveting end (51) presses the inner isolating member (2) onto the inner wall surface of the shell (1), the portion of the rivet (5) that passes through the mounting hole is cold-forged and flanging to form the external riveting end (52), and the external riveting end (52) is pressed onto the gasket (4) to press the outer isolating member (3) and the inner isolating member (2) onto the outer wall surface of the shell (1) through the gasket (4).

5. The power battery case according to claim 4, characterized in that: A receiving area (41) is formed at the inner circle of the gasket (4) for receiving the external riveted end (52) of the rivet (5), and the gasket (4) in the receiving area (41) and the external riveted end (52) are welded and flow-through.

6. The power battery case according to claim 4, characterized in that: It also includes a sealing pin (6), wherein a receiving groove (53) is formed at the inner circle of the external riveting end (52) of the rivet (5), the sealing pin (6) is assembled in the receiving groove (53), and the external riveting end (52) in the receiving groove (53) is seal-welded to the sealing pin (6).

7. The power battery case according to claim 6, characterized in that: The sealing pin (6) is formed with a flange ring (61) which is assembled into the receiving groove (53).

8. The power battery case according to claim 4, characterized in that: It also comprises a current collecting plate (7), which is arranged inside the shell (1) and connected to the inner isolating member (2) of the rivet (5) by penetration welding.

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