Laminated flexible-package battery

Abstract

The invention provides a laminated flexible-package battery which comprises an anode piece, a cathode piece, a membrane, an electrolyte and an external package structure, wherein the external package structure packages the anode piece, the cathode piece, the membrane and the electrolyte; the anode piece, the cathode piece and the membrane are laminated; the anode piece and the cathode piece are respectively located on the two sides of the membrane, and bonded with the membrane; the anode piece comprises a flaky anode current collector and an anode material layer; the anode material layer is arranged on two opposite surfaces of the anode current collector; the surface density of the anode material layer is 362-367g / m<2>; and the compaction density of the anode material layer is 2.38-2.40g / cm<3>. Compared with the prior art, the battery has a high-quality energy ratio, can instantly release high energy, and can adapt to quick charging and quick discharging of an electromobile; the service life of the battery is free from an influence of multiplying power charging and discharging; the high compaction density is adopted, so that the battery has good electron conductivity and quick ion actuation during heavy current discharging; discharging polarization is reduced; discharging platform voltage is increased; and multiplying power discharging performance is improved.

Description

technical field [0001] The invention relates to a battery, in particular to a laminated soft pack battery. Background technique [0002] The lithium-ion battery made by lamination technology can replace the current multi-pole winding lithium-ion battery in high-rate discharge, and is more suitable for the supply of starting power for electric vehicles; and under the premise of the same type, the winding Due to the thickness of the tabs, the arcs on both sides of the battery cell, and the two-layer diaphragm at the end, the internal space of the battery cell is not fully utilized, and the energy density is relatively low. The laminated pouch battery solves this problem very well, and can obtain Higher energy density; the laminated battery structure reduces the bending area and thickness change area, the surface of the pole piece is flat, there is no tension in the length direction, the contact between the pole piece and the separator is better, and the interface reaction is u...

AI Technical Summary

Problems solved by technology

[0003] However, the existing laminated lithium-ion battery can not fully meet the needs of the car's starting power supply in the high-rate discharge charge-discharge performance and charge-discharge cycle performance, and its performance needs to be improved.

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