Double-hole lithium ion cover plate and rocking-chair type liquid injection device and method thereof

Abstract

The invention discloses a double-hole lithium ion cover plate and a rocking-chair type liquid injection device and method thereof, and belongs to the technical field of lithium ion battery process preparation. The double-hole lithium ion cover plate comprises a first liquid injection hole and a second liquid injection hole which are formed in the two ends of the cover plate respectively, wherein each liquid injection hole is located above an r angle of an A pole core and a B pole core of a lithium ion battery. The cover plate is also provided with welding sites used for being fixedly connectedwith positive and negative lugs. During liquid injection, the double-hole lithium ion cover plate is arranged above the lithium ion battery body and welded and fixed together, and liquid is injectedthrough the liquid injection cups at the left end and the right end, enters the battery in a vacuum state, and can be dispersed in multiple directions and quickly infiltrated after entering a batterycell. The liquid injection time of a single battery is short, and the quick liquid injection requirement is met; and during formation and capacity grading, the internal produced gas can be divided anddischarged through the double liquid injection holes, so that the exhaust area is increased, the bulging of the battery is reduced, and the abnormal phenomenon of liquid overflow is eliminated.

Description

technical field [0001] The invention relates to injecting electrolyte solution into a battery, belongs to the technical field of lithium ion battery technology preparation, and in particular relates to a double-hole lithium ion cover plate and a rocking chair type liquid injection device and method thereof. Background technique [0002] Since the commercial production of lithium-ion batteries in the 1990s, its high specific energy, no pollution, no memory effect, and long cycle life have been widely used in electronic communications, energy storage equipment, electric vehicles, aerospace and other fields. Wide range of applications, with the rapid development of the electric vehicle industry in recent years, the quality requirements for lithium-ion batteries, especially power lithium-ion batteries, are getting higher and higher. insufficient; [0003] 1. Liquid injection background: Electrolyte is an indispensable and important part of lithium-ion batteries. As a medium for...

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