Battery cell structure

Abstract

The utility model discloses a battery cell structure, which comprises a first cover plate, a second cover plate and a middle frame arranged between the first cover plate and the second cover plate, the middle frame is provided with a splicing seam and a pole, and the splicing seam and the pole are positioned on different side walls of the middle frame. According to the battery cell structure disclosed by the utility model, the technical problems that the part placement space is insufficient as the splicing seam and the pole column are positioned on the same side, the edge distance of the pole column is unstable in size, and the size consistency is poor are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium ion battery, especially to a battery cell structure. BACKGROUND

[0002] Lithium ion battery has the advantages of high energy density, long cycle life, environmental friendliness, no memory effect, etc., and is widely used in mobile phones, portable computers, digital cameras, portable music playing devices and other mobile communication or digital products.

[0003] With the rapid development of electronic equipment updating in recent years, people have higher requirements for the endurance of lithium ion batteries. The existing hard shell structure battery is generally composed of a shell, a shell cover and a pole structure, and most of the shell is made by stamping forming. However, the stamping forming method will limit the size of the battery cell forming, thereby affecting the space of the battery cell, resulting in small energy density of the battery cell. In addition, the stamping forming method needs to open the mold, which has high cost. UTILITY MODEL CONTENT

[0004] The utility model discloses a battery cell structure, which solves the technical problems of limited shell size, small battery cell structure space and small energy density caused by stamping forming, and solves the technical problems of high mold opening cost and unfavorable project progress caused by stamping forming. The battery product is free of customization, the size is not limited by the mold, the energy density of the battery cell structure is high, and the production cost is low.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a battery cell structure, the battery cell structure includes first cover plate, second cover plate and the middle frame that sets up between first cover plate and second cover plate, is equipped with splicing seam and pole on the middle frame, splicing seam and pole are located on the different side walls of middle frame.

[0007] Further, the middle frame includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are oppositely arranged, the third side wall and the fourth side wall are oppositely arranged, the opposite ends of the third side wall are connected with one end of the first side wall and the second side wall respectively, and the opposite ends of the fourth side wall are connected with the other end of the first side wall and the second side wall respectively.

[0008] Further, the splicing seam is arranged on the fourth side wall, and the pole is arranged on the first side wall.

[0009] Further, the first side wall is further provided with a connecting piece and a liquid injection hole, and a sealing element is arranged in the liquid injection hole.

[0010] Further, the middle frame is bent from a metal strip, or the middle frame is cut from a metal pipe.

[0011] Further, the inner cavity enclosed by the first cover plate, the second cover plate and the middle frame is a containing cavity, and an electric core is arranged in the containing cavity, and the electric core is connected with the pole.

[0012] Further, the middle frame is fixedly connected with the first cover plate and the second cover plate by laser welding or gluing.

[0013] Further, the electric core is fixedly connected with the pole by ultrasonic welding or laminated multi-pole ear laser welding.

[0014] In summary, the electric core structure has the following advantages:

[0015] The electric core structure comprises a first cover plate, a second cover plate and a middle frame arranged between the first cover plate and the second cover plate, the middle frame is provided with a splicing joint and a pole, and the splicing joint and the pole are located on different side walls of the middle frame, i.e. the splicing joint and the pole are located on two adjacent or opposite side walls of the middle frame, so as to solve the technical problems of insufficient part placement space caused by the splicing joint and the pole being located on the same side, and unstable pole side distance size and poor size consistency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a perspective view of the electric core structure of the utility model; and

[0017] Figure 2 Fig. 2 is an exploded view of the electric core structure shown in Fig. 1. Figure 1

[0018] The accompanying drawings

[0019] First cover plate 1, middle frame 2, second cover plate 3, splicing joint 4, first side wall 5, second side wall 6, third side wall 7, fourth side wall 8, pole 9, liquid injection hole 10, connecting piece 11. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] Please refer to Figures 1-2 ​The utility model provides a kind of battery cell structure, the battery cell structure includes first cover plate 1, second cover plate 3 and the middle frame 2 between the first cover plate and the second cover plate, the middle frame is equipped with splicing seam 4 and pole 9, the splicing seam and the pole are located on the different side wall of the middle frame.

[0022] In one embodiment, the middle frame includes a first side wall 5, a second side wall 6, a third side wall 7 and a fourth side wall 8, the first side wall and the second side wall are oppositely arranged, the third side wall and the fourth side wall are oppositely arranged, the opposite ends of the third side wall are respectively connected with one end of the first side wall and the second side wall, and the opposite ends of the fourth side wall are respectively connected with the other end of the first side wall and the second side wall.

[0023] In one embodiment, the splicing seam is provided on the fourth side wall, and the pole is provided on the first side wall. It can be understood that in other embodiments, the splicing seam is provided on the third side wall, and the pole is provided on the second side wall, as long as the splicing seam and the pole are located on different side walls of the middle frame.

[0024] In one embodiment, the first side wall is further provided with a connecting piece 11 and a liquid injection hole 10, and a sealing element is provided in the liquid injection hole. The connecting piece is used to connect an external protective plate.

[0025] In one embodiment, the middle frame is formed by bending a metal strip material, or the middle frame is formed by cutting a metal pipe material. The middle frame is combined by at least one splicing seam through welding, sticking or other methods. Specifically, the forming process of the middle frame includes coil or strip feeding, leveling, punching and cutting, punching, bending, shaping and splicing. The splicing method of the middle frame includes laser welding or other methods at the splicing position of the strip cutting, and a distance of 1-100 um is reserved at the starting and ending points of welding.

[0026] In one embodiment, the first cover plate, the second cover plate and the middle frame are made of at least one material of coil, strip or sheet of stainless steel, aluminum or other metal materials.

[0027] In one embodiment, the inner cavity enclosed by the first cover plate, the second cover plate and the middle frame is a containing cavity, and an electric core is provided in the containing cavity, and the electric core is connected with the pole.

[0028] In one embodiment, the middle frame is fixedly connected with the first cover plate and the second cover plate by laser welding or uv glue sticking.

[0029] In one embodiment, the electric core and the pole are fixedly connected by ultrasonic welding or laminated multi-pole laser welding.

[0030] The utility model discloses a battery cell structure, the splicing seam and the pole are located on the different side wall of the middle frame, that is, the splicing seam and the pole are located on the adjacent or opposite two side walls of the middle frame, to solve the technical problem of insufficient part placing space caused by the splicing seam and the pole being located on the same side, and unstable pole edge distance size and poor size consistency.

[0031] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the utility model, but not to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the utility model.

Claims

1. A battery cell structure, characterized in that: The battery cell structure includes a first cover plate, a second cover plate, and a middle frame arranged between the first cover plate and the second cover plate. The middle frame is provided with a splicing seam and a pole, and the splicing seam and the pole are located on different side walls of the middle frame.

2. The battery cell structure according to claim 1, wherein: The middle frame includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged opposite to each other, the third side wall and the fourth side wall are arranged opposite to each other, the opposite ends of the third side wall are respectively connected to one end of the first side wall and the second side wall, and the opposite ends of the fourth side wall are respectively connected to the other end of the first side wall and the second side wall.

3. The battery core structure according to claim 2, wherein: The joint seam is provided on the fourth side wall, and the pole is provided on the first side wall.

4. The battery core structure according to claim 2, wherein: A connecting piece and a liquid injection hole are also provided on the first side wall, and a sealing member is provided in the liquid injection hole.

5. The battery cell structure according to claim 1, wherein: The middle frame is formed by bending a metal strip, or by cutting a metal pipe.

6. The battery cell structure according to claim 1, wherein: An inner cavity enclosed by the first cover plate, the second cover plate and the middle frame is a receiving cavity, in which a battery cell is arranged, and the battery cell is connected to the pole.

7. The battery cell structure according to claim 1, wherein: The middle frame is fixedly connected to the first cover plate and the second cover plate by laser welding or gluing.

8. The battery cell structure according to claim 6, wherein: The battery core and the pole are fixedly connected by ultrasonic welding or laminated multi-tab laser welding.

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