Total temperature-range lithium ion battery

Abstract

The invention provides a total temperature-range lithium ion battery. The total temperature-range lithium ion battery comprises a multi-tab anode piece having a compound multi-layer coating structure, a multi-tab cathode piece having a compound multi-layer coating structure, a high temperature-resistant diaphragm and a high / low temperature composite electrolyte. Each one of two sides of a part 4 on positive and negative current collectors is orderly coated with a rapid charging / discharging layer 1 (1a, 1b), a transition layer 2 (2a, 2b) and a slow charging / discharging layer 3 (3a, 3b). Through the structure, the total temperature-range lithium ion battery has rapid charging / discharging performances without battery energy density reduction. Through the multi-tab structure, the high temperature-resistant diaphragm and the high / low temperature composite electrolyte, battery ohmic resistance and electrochemical interface impedance are reduced and battery safety is improved. The total temperature-range lithium ion battery can realize normal charging and discharging at a temperature of -40 to 75 DEG C and has excellent low-temperature high-magnification characteristics and high-temperature and long-life performances.

Description

technical field [0001] The invention relates to a lithium-ion battery, a full-temperature-range lithium-ion battery that can be used for normal charging and discharging within the temperature range of -40°C to 75°C. The battery uses a multi-tab positive electrode with a composite multi-layer coating structure The pole piece, the multi-pole negative pole piece and the high temperature resistant diaphragm are assembled, and the high and low temperature composite electrolyte is used as the electrolyte, which effectively expands the normal operating temperature range of the lithium ion battery and solves the safety problem of the lithium ion battery at low temperature And the shortcoming of poor cycle life when used at high temperature. technical background [0002] Lithium-ion batteries have developed rapidly in the past two decades, and have completely replaced traditional nickel-metal hydride batteries and nickel-cadmium batteries in the fields of portable communications and ...

AI Technical Summary

Problems solved by technology

[0008] According to the specific design and manufacture of lithium-ion batteries according to the operating temperature environment, the safe use of lithium-ion batteries under specific conditions can be solved. However, for mobile vehicles and equipment, battery applications in the military and aerospace fields require lithium-ion batteries It has a wide range of operating temperatures, such as lithium-ion batteries used in electric vehicles and hybrid vehicles. Electric vehicle manufacturers need to sell globally, and the performance of the products needs to adapt to the climate and environment of different regions. Even in the same region, electric vehicle batteries The use environment will also change with the seasons, and the influence of road conditions will have relatively large temperature changes. If regional products are manufactured and sold in a differentiated manner, it will bring about an increase in costs and inconvenience to consumers.

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