A full temperature range lithium-ion battery

Abstract

The invention provides a full-temperature-range lithium-ion battery, which includes a multi-tab positive pole piece with a composite multi-layer coating structure, a multi-tab negative pole piece, a high-temperature-resistant diaphragm, a high-low temperature composite electrolyte, and the like. The two sides of the positive and negative current collectors 4 are respectively coated with fast charge and discharge layers 1 (1a, 1b), transition layers 2 (2a, 2b) and slow charge and discharge layers 3 (3a, 3b), so that the The battery with this structure improves the rapid charge and discharge performance of the battery without reducing the energy density of the battery; the use of multi-pole structure, high temperature resistant diaphragm and high and low temperature composite electrolyte reduces the ohmic internal resistance and electrochemical interface impedance of the battery, The safety performance of the battery is improved. The full-temperature-range lithium-ion battery can be charged and discharged normally in the temperature range of -40°C and 75°C, and has excellent low-temperature high-rate characteristics and high-temperature long-life performance.

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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