Vacuum formation method of lithium ion battery

Abstract

The invention discloses a vacuum formation method of a lithium ion battery. In the method, an electrolyte injection process and a formation process of the battery are completed by adopting an integrated fixture with electrolyte-injecting and charging functions and a vacuum formation device with charging and vacuumizing functions. The vacuum formation device charges the battery arranged in the integrated fixture, and the battery is electrically connected with the vacuum formation device by the integrated fixture. The vacuum formation method of the invention provides an enclosed and controllable microenvironment, thereby reducing electrolyte waste, avoiding overflow loss of electrolyte and corrosion on a battery casing, the fixture or charging equipment, and effectively reducing environmental pollution.

Description

technical field [0001] The invention relates to a manufacturing and processing method of a lithium-ion battery, and more specifically, to a vacuum formation method of a lithium-ion battery. Background technique [0002] In recent years, with the emphasis on the non-renewable energy crisis and environmental protection, the application of green and environmentally friendly lithium-ion batteries in mobile phone power supplies, electric vehicles, electric tools and electric toys has achieved rapid development. In the existing manufacturing process of lithium-ion batteries, the liquid injection and formation (that is, the first charging of lithium-ion batteries) processes of lithium-ion batteries are generally operated separately. Firstly, liquid injection is usually performed by sucking back and vacuuming or using a clamp with a sealing ring. Back suction vacuum injection is to put the battery upside down in a closed container with electrolyte at the bottom, and then vacuumize....

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Problems solved by technology

[0003] In the formation process, positive pressure will be generated inside the battery. Since the above-mentioned formation process is carried out in an open environment, the positive pressure generated inside the battery can easily cause the overflow of the electrolyte, which will inevitably lead to the waste of the electrolyte; secondly, the electrolyte Long-term contact with the outside air, the reaction between the water vapor in the air and the electrolyte will cause the electrolyte to deteriorate. If this part of the electrolyte returns to the inside of the battery, it will seriously affect the performance of the battery, such as capacity, voltage, etc.; In addition, because the overflowed electrolyte flows directly to the outside of the battery, it may corrode the charging equipment and the battery casing; moreover, the electrolyte that volatilizes into the air will form a mixed gas with the air, and the mixed gas is very dangerous for long-term operators. It is harmful and will cause adverse reactions to its skin and respiratory system. At the same time, the spilled electrolyte and the subsequent mixed gas will cause pollution to the environment.

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