Positive plate of lithium ion power battery as well as manufacturing method and laser etching device of positive plate

Abstract

The invention discloses a positive plate of a lithium ion power battery as well as a manufacturing method and a laser etching device of the positive plate. The positive plate comprises a positive current collection body and a positive membrane applied onto the positive current collection body, wherein a micro groove is etched on the positive membrane; and the depth of the micro groove is smaller than the thickness of a one-layer electrode membrane. The micro groove is etched on the positive membrane after the cold-pressing operation, so that the wetting performance of the surface of the lithium iron phosphate positive plate to an electrolyte solution is improved to a great extent, the permeation efficiency of the electrolyte solution of the high-capacity lithium ion power battery is improved, the distribution uniformity of the electrolyte solution in the positive plate is improved, the capacity of the lithium ion power battery is increased, the cycle life of the lithium ion power battery is prolonged, and the production efficiency of the lithium ion power battery is improved at the same time.

Description

technical field [0001] The invention relates to a lithium-ion power battery, and more specifically, the invention relates to a lithium-ion power battery positive plate and a manufacturing method thereof. Background technique [0002] The liquid injection process of lithium-ion batteries initially uses manual liquid injection in a glove box or a dry box, and the liquid injection efficiency and absorption efficiency are extremely slow. With the development of technology, lithium-ion battery vacuum liquid injection machines and vacuum and positive pressure cycle liquid injection machines appeared later. The above liquid injection methods can greatly improve the liquid injection efficiency and production capacity of mobile phone batteries, notebook batteries and other small-capacity batteries. [0003] However, with the development of modern society and the energy crisis and environmental protection problems faced by human beings, people began to apply lithium-ion batteries to t...

AI Technical Summary

Problems solved by technology

The application of lithium-ion power batteries in the automotive industry has made people have higher requirements for battery capacity and capacity consistency. Therefore, the low injection efficiency and absorption speed have once again become a major production bottleneck in the lithium-ion power battery manufacturing industry. Especially for lithium-ion power batteries with nano-lithium iron phosphate as the positive electrode system, due to the dense and smooth surface of the positive electrode sheet, the infiltration and absorption of the electrolyte is very slow, which greatly affects the production efficiency and the distribution of the electrolyte inside the battery. , and the electrolyte is unevenly distributed inside the battery pole piece, which has a great impact on the performance of the battery capacity and the consistency of its capacity

Images