A kind of activation technology of lithium ion battery

Abstract

The invention discloses a novel activation process of a lithium-ion battery. The process specifically includes the following steps: 1) Formation charging: voltage limiting, current limiting, and time-limiting forming charging are adopted, and the ambient temperature is 23±2°C and the humidity is ≤10 %; 2) Sealing: vacuum seal the battery in an environment with a temperature of 23±2°C and a dew point of ‑40°C; 3) Pre-charging: charge with voltage limitation, current limitation, and capacity limitation, and the ambient temperature is 23±2 ℃; 4) High-temperature aging of the battery: transfer to a high-temperature shelf room for aging for 48 hours, and the temperature of the high-temperature shelf room is 45±2°C; 5) Formation discharge: use voltage limiting, current limiting, and time-limiting forming discharge, and the ambient temperature is 23±2°C ;6) Voltage drop test: Measure and record the open circuit voltage of each single battery 24 hours after formation and discharge. The labor cost of loading and unloading the battery cabinet and the energy consumption during capacity division are reduced.

Description

technical field [0001] The invention relates to a battery activation process, in particular to an activation process for lithium iron phosphate lithium ion batteries, which can effectively shorten the activation time of lithium batteries and reduce energy consumption in the battery manufacturing process , belonging to the field of new energy battery technology. Background technique [0002] At present, oil resources are becoming increasingly scarce and environmental pollution is becoming more and more serious. It is imminent to develop new energy sources to replace traditional petrochemical energy sources. In this context, it is particularly important to accelerate the development of environmentally friendly lithium-ion batteries. [0003] With the strong support of the state, the lithium-ion battery industry has developed rapidly in recent years. Although the battery production steps are slightly different, they are generally the same: stirring-coating-rolling-sheet-forming...

AI Technical Summary

Problems solved by technology

[0006] After the battery is aged, the capacity, voltage drop, internal resistance, and thickness will be selected. In the previous process, the aging of the battery is after the formation of charge and discharge, and before the capacity separation. There are several defects in this process: first, the formation and discharge capacity is inaccurate, Affect the performance judgment; second, the OCV measurement error is caused by the unstable voltage of the battery after formation; third, the entire activation time is longer