Packaging structure of lithium ion battery, and packaging method and formation method for packaging structure

Abstract

The invention discloses a packaging structure of a lithium ion battery. The packaging structure comprises an aluminum plastic film, wherein air bags and cell placement grooves are arranged on the aluminum plastic film; the cell placement grooves and the air bags are symmetrically arranged along the perpendicular line of the centre-broken-line of the aluminum plastic film from the centre-broken-line to the two ends of the aluminum plastic film in sequence; an avoidance nick for accommodating tabs is formed in the aluminum plastic film between the cell placement grooves and the air bags. According to the packaging method and formation method for the packaging structure, the preparation quality of the battery can be effectively improved, the materials can be saved, and the rejection rate can be lowered.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a lithium-ion battery packaging structure, a packaging method, and a chemical formation method. Background technique [0002] like figure 1 As shown, the existing packaging technology adopts the airbag on the side of the main pit (battery cell placement slot), and the liquid injection port is located on the side of the negative electrode of the battery. The inside of the core, and gradually infiltrated, the process path is long, and is blocked by the top seal and corner seal, the electrolyte takes a long time to enter the inside of the core, causing the electrolyte to remain in the air bag, and it is easy to be squeezed out during sealing. Corrosion of the electrolyte. [0003] After the battery is formed, it is baked with a fixture. After the battery is clamped, the cylinder arm exerts a certain pressure on the battery cell to flatten the battery cell. ...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 As shown, the existing packaging technology adopts the airbag on the side of the main pit (battery cell placement slot), and the liquid injection port is located on the side of the negative electrode of the battery. The inside of the core, and gradually infiltrated, the process path is long, and is blocked by the top seal and corner seal, the electrolyte takes a long time to enter the inside of the core, causing the electrolyte to remain in the air bag, and it is easy to be squeezed out during sealing. Corrosion of the electrolyte

[0003] After the battery is formed, it is baked with a fixture. After the battery is clamped, the cylinder arm exerts a certain pressure on the battery cell to flatten the battery cell. This process will squeeze the residual gas and electrolyte in the battery cell into the air bag, such as As mentioned above, the path of the electrolyte entering and leaving the air bag is not smooth, causing the electrolyte and gas to squeeze the top seal upward, causing the top seal of the battery to burst, causing the electrolyte to flow out, causing corrosion and pollution of the battery, and seriously causing the battery to be scrapped

[0004] When the battery is produced by vacuum sealing, the excess electrolyte and gas in the battery are pumped out. Due to the poor path, this phenomenon will cause the electrolyte to not drain cleanly, and there will be more residual electrolyte in the battery, and even gas, causing the battery to explode. Soft, uneven surface, affecting the appearance of the battery

[0005] According to the existing packaging method, the edges are sealed on both sides, and the folded edges are easy to rebound and open, resulting in an ultra-wide battery. In order to meet customer needs, the width of the winding core needs to be reduced, which puts pressure on improving the energy density.

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