Formation degassing structure of soft package lithium battery

Abstract

The utility model discloses a formation degassing structure of a soft package lithium battery, and relates to the field of liquid injection and formation processes and equipment. Comprising a heating pipe, the heating pipe comprises a left pipe and a right pipe, the right pipe comprises a miniature air cylinder and a vacuum pipeline, the miniature air cylinder is arranged at the end of the right pipe, the outer wall of the right pipe on the left side of the miniature air cylinder is connected with the vacuum pipeline, the miniature air cylinder is connected with a pricking needle, the pricking needle is arranged in a guide hole in the center of the right pipe, and the vacuum pipeline is communicated with a vacuum hole. According to the utility model, the use amount of the aluminum plastic film can be reduced, the gas produced by formation can be discharged in time, the negative reaction in the battery cell is reduced, the risk that the aluminum plastic film is expanded and damaged due to the produced gas is solved, the cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of liquid injection and formation processes and equipment, specifically to a degassing structure for the formation of soft-pack lithium batteries. Background Technology

[0002] The current trend of soft-pack power batteries is towards larger capacity and larger size. The aluminum-plastic film used for packaging soft-pack batteries is a relatively expensive raw material. It is used in large quantities, resulting in high BOM costs. During the high-temperature jig formation process of semi-finished cells, a large amount of gas is generated. The generated gas is temporarily stored in a gas bag. During the degassing and forming process, the aluminum-plastic film of the gas bag is punctured with a dagger, then vacuumed, and finally packaged and formed.

[0003] The existing technology in the industry uses a large amount of aluminum-plastic film, resulting in high raw material BOM costs. Secondly, if the gas bag size reserved in the cell design is too small, the gas production during formation will exceed the gas bag volume, causing severe bulging of the aluminum-plastic film. This not only damages the sealing performance of the top and side seals but also damages the PP layer on the inner surface of the aluminum-plastic film, reducing the insulation resistance between the aluminum-plastic film of the cell and the negative electrode, and increasing the risk of corrosion and leakage inside the cell.

[0004] The above process requires a large amount of aluminum-plastic film, resulting in high costs. Secondly, the amount of gas produced during formation will fluctuate, but the size of the gas bag is fixed. When the amount of gas produced occasionally exceeds the process standard, the quality of these cells will be downgraded, affecting product quality and reducing product yield. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a degassing structure for the formation of soft-pack lithium batteries. The structure is reasonably designed, which can not only reduce the amount of aluminum-plastic film used and timely discharge the gas produced during formation, thus reducing the negative reaction inside the cell, but also solve the risk of damage to the aluminum-plastic film due to gas production, thereby reducing costs and improving product quality.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a soft-pack lithium battery formation degassing structure, including a heating tube, wherein the heating tube includes a left tube and a right tube, wherein the right tube includes a micro cylinder and a vacuum pipe, the micro cylinder is disposed at the end of the right tube, the outer wall of the right tube on the left side of the micro cylinder is connected to the vacuum pipe, the micro cylinder is connected to a piercing needle, the piercing needle is disposed in a guide hole in the center of the right tube, and the vacuum pipe is connected to the vacuum hole.

[0007] Preferably, the heating element is provided with a copper end cap, which is electrically connected to the resistance wire.

[0008] Preferably, the heating element is also connected to left and right cylinders or robotic arms at both ends.

[0009] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonable. It can not only reduce the amount of aluminum-plastic film used and timely discharge the gas produced by the formation process, thus reducing the negative reaction inside the battery cell, but also solve the risk of damage to the aluminum-plastic film due to gas production swelling, thereby reducing costs and improving product quality. Attached Figure Description

[0010] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0011] Figure 1 This is a schematic diagram of the usage state of this utility model;

[0012] Figure 2 This is a cross-sectional view of the right tube of this utility model;

[0013] Figure 3 This is a left view of the right tube of this utility model. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] Reference Figure 1-3 The specific embodiment adopts the following technical solution: a soft-pack lithium battery formation degassing structure, including a heating tube 1, the heating tube 1 including a left tube 2 and a right tube 3, the right tube 3 including a micro cylinder 4 and a vacuum pipe 5, the micro cylinder 4 is disposed at the end of the right tube 3, the outer wall of the right tube on the left side of the micro cylinder 4 is connected to the vacuum pipe 5, the micro cylinder 4 is connected to a needle 6, the needle 6 is disposed in the guide hole 7 in the center of the right tube 3, and the vacuum pipe 5 is connected to a vacuum hole 8.

[0016] It is worth noting that the heating tube 1 is provided with a copper end cap, which is electrically connected to the resistance wire.

[0017] In addition, the two ends of the heating tube 1 are connected to the left and right cylinders or robotic arms.

[0018] This specific embodiment uses brass and components such as a miniature cylinder to create a multifunctional device with a series of functions including vacuum adsorption, piercing aluminum-plastic film, vacuum degassing, and heat sealing of pinholes.

[0019] In this specific embodiment, the device rotates 90° toward the battery cell, and the left and right devices are brought together by cylinders / robotic arms to contact the surface of the aluminum-plastic film air bag 9 of the soft-pack battery cell 10; a vacuum is activated to hold the aluminum-plastic film in place; a micro cylinder is used to push the needle 6 to pierce a small hole in the battery cell air bag, and the gas produced by the atomization is sucked away by the vacuum through this small hole; after the atomization and gas production is complete, a resistance wire is used to heat the copper end face end cap to the temperature set by the process, and the needle hole is sealed by annular heat sealing to prevent outside air from entering the battery cell.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1.A structure for formation and degassing of a soft-pack lithium battery, characterized in that, The application relates to a heating tube (1) comprising a left tube (2) and a right tube (3), wherein the right tube (3) comprises a micro air cylinder (4) and a vacuum pipe (5), the micro air cylinder (4) is arranged at the end of the right tube (3), the outer wall of the right tube on the left side of the micro air cylinder (4) is connected with the vacuum pipe (5), the micro air cylinder (4) is connected with a needle (6), the needle (6) is arranged in a guide hole (7) in the center of the right tube (3), and the vacuum pipe (5) is communicated with a vacuum hole (8). 2.The formation and degassing structure of a soft package lithium battery according to claim 1, characterized in that, A copper end face sealing head is arranged on the heating tube (1), and the copper end face sealing head is electrically connected with a resistance wire. 3.The formation and degassing structure of a soft package lithium battery according to claim 1, characterized in that, The two ends of the heating tube (1) are further connected with left and right air cylinders or mechanical hands.

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