Preparation method of square lithium iron phosphate battery capable of improving cycle performance and square lithium iron phosphate battery

By using polyethylene diaphragm double-sided coated ceramic layer and Z-shaped stack assembly technology in lithium iron phosphate batteries, combining high-temperature stand-alone and negative pressure formation, the problem of insufficient circulation performance is solved and the battery is efficiently produced and cycle performance improvement.

CN119253199AInactive Publication Date: 2025-01-03TIANJIN SPACE POWER TECH CO LTD
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Patent Information

Application Number
CN202411366811.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2025-01-03
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing lithium iron phosphate batteries have shortcomings in circulation performance, which requires additional production processes and is difficult to ensure the consistency of raw material coating modification, resulting in difficult to easily mass production on a large scale, and the trend of cycle attenuation is obvious.

Method used

The ceramic layer is coated on both sides with a polyethylene diaphragm, with a total thickness of 1μm-3μm. The positive electrode and negative electrode are assembled in the form of Z-shaped laminates, and combined with high-temperature standstill and negative pressure forming technology, the process is simplified and the circulation performance is improved.

Benefits of technology

It improves the cycling capacity of the battery, reduces the cycle attenuation trend, reduces the system energy density, simplifies mass production control, and improves user experience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a preparation method of a square lithium iron phosphate battery capable of improving cycle performance and the square lithium iron phosphate battery, a diaphragm is a polyethylene coated ceramic layer diaphragm, double surfaces of the diaphragm are coated with ceramic layers, the total thickness of the ceramic layers is 1-3 microns, the ceramic layers can improve the liquid retention capacity and contribute to improving the cycle capacity, and the ceramic layers are too thick, so that the cycle performance of the lithium iron phosphate battery is improved. The system energy density is reduced. The process is simplified, and mass production control is easy; the cycle performance is improved, the cycle attenuation trend is reduced, and the user experience is improved.
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Citation Information

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