High temperature pressure conversion has become a key activation process in lithium-ion battery production, aiming to promote the formation of stable SEI film through high temperature and high pressure environment, thereby improving the comprehensive performance of the battery. Its workflow is mainly divided into four stages:

1. Loading and liquid injection: Load the wound or laminated battery cells into a high-temperature and pressure resistant fixture, accurately inject a certain amount of electrolyte, and ensure that the battery cells are completely immersed.

2. High temperature pressure activation: Transfer the fixture to a specialized equipment and apply a specific pressure (such as 0.5-1.0MPa) in a high temperature (usually 45-60 ℃) environment, while applying a preset low current charging and discharging program. The high temperature and high pressure environment significantly enhances the activity of lithium ions, promotes electrolyte decomposition reactions, and helps to form a dense, uniform, and lower impedance SEI film.

3. Exhaust and sealing: After the formation is completed, release the pressure and open the fixture to exhaust the gas generated during the formation process, and then complete the final sealing operation of the battery.

4. Aging and screening: After sealing, the battery enters the aging stage, and high-quality cells with stable voltage platform, consistent internal resistance, and performance standards are screened through static and charge discharge tests.

This process can effectively reduce battery internal resistance, improve voltage platform stability and cycle life, and is the core technical guarantee for producing high rate and high consistency high-end lithium batteries.