Pole piece structure of lithium battery and polymer soft package lithium battery

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a pole piece structure of a lithium battery and a polymer soft package lithium battery in order to solve the technical problem that an existing product is low in rate capability, a pole piece comprises a positive pole piece and a negative pole piece, the pole piece is provided with a current collector, the current collector is coated with an active material, and the active material is a polymer soft package lithium battery. A gap for welding the drainage body is reserved in the middle of the pole piece, an active substance is vacant in the gap, and the drainage body is welded on the current collector in an ultrasonic manner. The head super-welding drainage bodies of the positive and negative pole pieces are changed into middle welding, the head and the tail are both active substances, compared with an existing structure, the covering area of the active substances can be increased, the internal resistance of the battery is reduced, the current density is increased, the charge transfer speed is increased, and therefore the energy density and the rate charge-discharge performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a pole piece structure of a lithium battery and a polymer soft-pack lithium battery. Background technique [0002] With the rapid development of the lithium battery industry, the technology and product quality of polymer prismatic lithium-ion batteries are also improving day by day. Seeing that electronic communication equipment is becoming more and more high-end, it is accompanied by higher and farther requirements for built-in power, such as requirements for magnification, cycle life, safety performance, appearance, etc. And because the variety of electronic devices satisfies the matching degree between batteries and products, it also increases challenges to battery technology and production under the background of improving the performance of the battery itself. [0003] As the main components of lithium-ion batteries, the positive electrode and negative electro...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a pole piece structure of a lithium battery and a polymer soft-packed lithium battery to solve the technical problem of low rate performance of existing products

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