High-power soft package battery and preparation method thereof

Abstract

The invention relates to a high-power soft package battery and a preparation method thereof. The high-power soft package battery comprises an aluminum-plastic composite film shell and a composite battery core arranged in the aluminum-plastic composite film shell, electrolyte is packaged in the aluminum-plastic composite film shell, and the composite battery core is formed by stacking a positive plate, a negative plate and a diaphragm. The positive plate adopts an aluminum tab as an exposed tab, and the negative plate adopts a nickel-plated copper tab as an exposed tab. The positive plate is composed of a carbon-coated aluminum foil and a positive active material coated on the carbon-coated aluminum foil, and the negative plate is composed of a copper foil and a negative active material coated on the copper foil. The method is characterized by winding the prepared positive plate, the prepared negative plate and the diaphragm into a naked battery cell, packaging the battery cell by adopting an aluminum plastic film through a heat sealing process, removing the moisture in the battery through high-temperature vacuum baking, injecting electrolyte to prepare the battery core, and sealing the battery through vacuum to obtain a target battery. The positive active material and the negative active material adopted by the battery structure have the characteristics of good stability and excellent rate capability.

Description

technical field [0001] The invention relates to the field of battery processing, in particular to a high-power pouch battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is currently the battery system with the best comprehensive performance on the market. Compared with several other secondary batteries, such as lead-acid batteries, nickel-chromium batteries and metal hydride nickel batteries, lithium-ion batteries have the advantages of low cost and high energy density, so they are widely used in mobile phones, digital cameras and notebook computers and other portable electronic devices. [0003] In recent years, lithium-ion secondary batteries have become more and more widely used, especially in the field of high-power charging and discharging, such as: car starting power, drones, electric forklifts, which require high-rate charging and discharging, while conventional designs and materials are often Magnification performance is poor...

AI Technical Summary

Problems solved by technology

Although the battery structure corresponding to the patented method has certain stability, its capacity retention rate and the stability of the thermal reaction of the battery need to be further improved. The stability of the positive active material of the battery positive plate and the negative active material of the negative plate It determines the actual capacity retention rate of the battery and the stability of the thermal reaction of the battery. Based on the existing technical problems, this patent improves the coating of the positive and negative electrodes of the battery and the corresponding structure

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