High-capacity lithium ion battery

Abstract

The invention discloses a high-capacity lithium ion battery, which comprises a shell. Battery core pole groups are arranged in the battery shell. The tops of the battery core pole groups are provided with a battery cover on which a filling port is formed. A safety valve is welded at the central position of the battery cover. The battery core pole group comprises a positive plate, a diaphragm, a negative plate and an elastic core plate. The positive and negative plates are wound on the elastic core plate. The diaphragm is arranged between the positive and negative plates to separate the positive and negative plates. A positive tab and a negative tab are positioned at the top ends of left and right sides of the pole group respectively, and are correspondingly connected with a cathode and an anode on the battery cover by a positive wire and a negative wire on the two sides of the battery cover respectively. By the high-capacity lithium ion battery with such a structure, the dead zone area of the battery plate is decreased, the electrical properties and safety performance of the battery are improved, and the high capacity and high-current output of the battery can be ensured.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a large-capacity lithium-ion battery with a winding structure of a large pole group and an elastic core plate. Background technique [0002] The energy crisis has not yet been resolved, and the earthquake in Japan has brought new problems to energy security. Clean and efficient nuclear energy has exposed serious safety problems, making it lose its dominant position in future development, and the efficient use of clean energy such as wind energy, solar energy, and water energy is becoming more and more important. The efficient storage of these clean energy, Conversion has also become one of the subjects of concern. [0003] Lithium-ion batteries have been widely used in the field of portable electronic products due to their advantages such as high specific energy, high capacity, no memory effect, clean and environment-friendly. With the increasingly ser...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a large-capacity lithium-ion battery that can eliminate the dead zone problem caused by the deformation of the pole piece and effectively improve the electrical performance and safety performance of the battery.

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