Liquid injection mold and liquid injection method for lithium ion battery

Abstract

A liquid injection mold and a liquid injection method for a lithium-ion battery, the liquid injection mold comprising: an upper casing for containing electrolyte, a liquid storage tank is arranged on the upper casing, a liquid injection part is arranged at the bottom of the liquid storage tank, and the liquid injection part and The liquid storage tank communicates with and protrudes downward from the bottom surface of the upper casing, and the outer diameter of the liquid injection part is smaller than the inner diameter of the battery casing to be filled; the middle casing of the battery casing to be filled is placed, and the middle casing is provided with a The battery placement slot corresponding to the position of the liquid storage tank of the upper set, the battery casing to be filled is set in the battery placement slot; the upper set is arranged on the middle set, and the injection of the upper set The liquid part protrudes into the casing of the battery to be filled with liquid. In the present invention, the battery casing is placed in the middle casing, and a corresponding liquid tank is arranged on the upper casing. The liquid injection part of the liquid storage tank extends into the battery casing, so that the electrolyte is strictly limited inside the battery casing The inner wall of the liquid tank of the upper set avoids the pollution of the electrolyte to the outside of the steel case of the battery and improves the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing equipment, and particularly relates to a liquid injection mold and a liquid injection method for a cylindrical lithium ion battery. Background technique [0002] Cylindrical battery is one of the main varieties of lithium ion battery. In the production process of cylindrical lithium ion battery, there is a process of injecting electrolyte into the battery. The liquid injection process is a very important process in the production of lithium ion batteries. The accuracy of the liquid injection amount and the level of liquid injection efficiency directly determine the consistency and production efficiency of the lithium ion battery. At present, in the production of lithium ion batteries, liquid injection is generally carried out by covering the liquid injection cup on the battery to be injected. The Chinese utility model patent with the application and patent number of 200920312455.1 a...

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Problems solved by technology

[0003] Due to the corrosiveness of the electrolyte, it is easy to splash and volatilize during the liquid injection process, which not only causes corrosion to the liquid injection equipment, affects the service life of the equipment, but also affects the quality of the battery, such as plugging and unplugging the casing ( Injection cup), the electrolyte in the casing is easy to touch the outer steel shell of the battery, and the outer steel shell is prone to be polluted by the electrolyte. At the same time, it will increase the material consumption of the electrolyte, reduce the accuracy of the injection, and cannot guarantee every time. The consistency of the electrolyte injected into a lithium-ion battery also affects the injection efficiency.

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