Formation method for soft package lithium-ion battery with lithium iron phosphate as anode

A lithium-ion battery and lithium iron phosphate technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., can solve the problems of difficult control of pole pieces, batteries with poor pressure holding performance, and large gas production. To achieve the effect of avoiding uneven response and avoiding local overcharge

Active Publication Date: 2013-01-23
CAMEL GRP NEW ENERGY BATTERY CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many reports on the formation methods of lithium-ion batteries, but for lithium iron phosphate as the positive electrode, there are few formation methods using flexible packaging as the outer shell.
At present, lithium iron phosphate flexible packaging batteries are mostly large-capacity power batteries. The formation process produces a large amount of gas, it is difficult to control the partial overcharge of the pole piece, and it is difficult to screen out batteries with poor pressure holding performance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Charging stage: charge the battery with a current of 0.05C-0.1C for 2-4 hours, then charge the battery with a current of 0.1C-0.2C to a range of 3.0-3.2V, then switch to constant voltage charging, and charge when the current decreases to 0.02C Terminated, the cell was then evacuated and sealed.

[0015] Storage stage: measure the voltage of the battery and make corresponding records, store it at 40-50°C for 3-6 days, and then measure the voltage to get the voltage drop of each battery. The battery with a voltage drop exceeding 0.03-0.05V is It is judged that the pressure holding performance is poor, and the batteries with poor pressure holding performance are treated as defective products and will not flow into the next process.

[0016] Recharging stage: continue to charge the battery whose voltage drop does not exceed 0.03-0.05V in the storage stage with a current of 0.2C-0.5C to 3.3-3.5V and then switch to constant voltage charging. When the current decreases to 0.02...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a formation method for a soft package lithium-ion battery with lithium iron phosphate as an anode, which belongs to the technical field of lithium-ion battery manufacturing processes. The whole formation process is mainly divided into four stages of charging, storage, recharging and re-storage; the charging voltage in the first stage is controlled at a low voltage section; and when the battery is stored for a longer time at the low voltage section, local overcharge of the surface of a pole piece can be preferably avoided; a vacuum-pumping step is available after the charging in both the first stage and the third stage; as the gas generated by the battery formation is eliminated as much as possible, non-uniform reaction of the pole piece caused by internal gas can be also preferably avoided; and as voltage drop screening is carried out in both the second stage (low voltage section) and the fourth stage (high voltage section), a problem that capacity graded battery with poor voltage maintaining performance is hard to screen can be also solved. According to the invention, problems that local overcharge is caused by large gas production and poor pole piece surface consistency and the battery with poor voltage maintaining performance is hard to screen in the formation process of the lithium iron phosphate soft package lithium-ion battery are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production technology, and in particular relates to a method for forming a flexible-package lithium-ion battery with lithium iron phosphate as the positive electrode. Background technique [0002] There are many reports on the formation methods of lithium-ion batteries, but for lithium iron phosphate as the positive electrode, there are few formation methods using flexible packaging as the outer shell. At present, lithium iron phosphate flexible packaging batteries are mostly large-capacity power batteries. The formation process produces a large amount of gas, it is difficult to control the local overcharge of the pole piece, and it is difficult to screen out batteries with poor pressure holding performance. Contents of the invention [0003] The object of the present invention is to provide a lithium iron phosphate flexible package in which the gas generated during the formation of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 刘琳吕循峰高国兴沈成龙娄勇刚
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products