Negative pressure type plastic housing ball valve lithium ionic battery and manufacturing method thereof

Abstract

Disclosed is a manufacturing method of a negative pressure-type plastic case ball valve lithium ion battery and a battery obtained by the method. The battery comprises a shell and a battery cell inside the shell, wherein the shell is equipped with lugs which are made of aluminum or aluminum alloy material and a ball valve which has functions of decompression and exhausting, and the shell and the lugs are formed into one through injection molding; the battering manufacturing method comprises steps as follows: firstly, an anode and a cathode are manufactured and then treated by drying, rolling, knife mold punching, lamination and packing, and the like; secondly, the packed battery cell lamination is punched and riveted with positive and negative columns of a cover board, then dried to remove moisture, sealed, loaded by the shell and injected with battery electrolyte, and then is stored at the room temperature after being conducted with formation; and thirdly, the battery cell is pumped to a state of negative pressure, and the battery is assembled to leave the factory. The manufacturing method is used in the plastic case hard-packing battery structure by making use of the theory of soft packing and negative pressure, can reduce the organic electrolyte which is highly combustible and free-flowing, reduce the internal resistance of the battery cell, balance the working temperature of the battery and prevent the generation of waste gases, meanwhile the thin wall of the plastic case needs no reinforcing posts so as to achieve aesthetic appearance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to the technical development of a large-capacity lithium-ion battery. Background technique [0002] The current situation is very hopeful for lithium-ion power batteries to be used in large quantities for vehicle power supplies as soon as possible, and it is generally recognized that under current conditions, lithium-ion batteries are the preferred battery for vehicle power supplies. Especially in the past ten years or so, in Japan, China, South Korea and other countries, a lot of manpower and material resources have been devoted to the development and research of the production technology of power lithium-ion batteries, no matter in the positive and negative electrode materials, the corresponding electrolyte formula, and the production process. Simplification, improvement of battery structure, repeated introduction of prototypes and prototypes to the marke...

AI Technical Summary

Problems solved by technology

At present, there are two types of power lithium-ion batteries, one is soft package (i.e. aluminum-plastic film outer packaging); the other is hard package (i.e. plastic case and metal case). Long-term high-current work requirements and extremely poor heat dissipation also directly affect the heat seal quality at the tabs, often causing solder leakage here

The structure of the plastic shell and the metal shell in the hard package is easy to form a dry area in the battery structure. Once the dry area is formed, the battery cell will overheat locally, causing the adsorbed electro-hydraulic gasification in the battery cell, resulting in an increase in the internal pressure of the battery, and the safety valve operates. The battery exhausts to the outside, and a large amount of electro-hydraulic is sprayed out in the exhaust, which pollutes the surrounding environment of the battery. The safety of the battery is in an extremely dangerous state, and its life is difficult to improve

[0004] In addition, whether it is a soft package or a hard package, the commonly used tab pole material, the positive pole is aluminum, and the negative pole is made of more expensive copper and nickel. The cost is too high and it is easy to cause waste of resources. Long life and low production cost of Li-ion battery is the purpose of the present invention

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