Polymer lithium ion low-temperature battery

Abstract

The invention discloses a polymer lithium ion low-temperature battery. The compaction thickness of an anode plate (3) is between 53 and 82mu m, an anode active material is one or more of lithium manganate, lithium nickel cobalt manganate and lithium cobaltate, an adhesive is polyvinylidene fluoride, a conductive agent is one or more of flake graphite, acetylene with the specific surface area of 1,500+ / -200m<2> / g, vapor grown carbon fibers (VGCF) and carbon nano-fibers (CNF), and the weight percentage ratio of the anode active material to the adhesive to the flake graphite to the acetylene to the VGCF is 85-96:1-5:1-3:1-4:1-3; and the compaction thickness of a cathode plate (5) is between 56 and 62mu m, a cathode active material is one or two of artificial graphite and mesocarbon microbeads, an adhesive is one or more of the polyvinylidene fluoride, styrene butadiene rubber (SBR) and carboxymethylcellulose (CMC), a conductive agent is one or more of conductive carbon black, the VGCF and the CNF, and the weight percentage ratio of the cathode active material to the SBR to the CMC to the carbon black to the VGCF is 85-96:1-5:1-3:1-4:1-3. The polymer lithium ion low-temperature battery has high low-temperature discharge performance, discharge rate, specific energy and safety, and stable product performance.

Description

technical field [0001] The invention relates to a battery, in particular to a polymer lithium-ion low-temperature battery that can be discharged at a low temperature of -40°C. Background technique [0002] Due to the advantages of high working voltage, high energy density, no memory effect, long cycle life, and no pollution, lithium-ion batteries have been more and more widely used in consumption, power, energy storage, and special batteries, gradually replacing traditional renewable energy. Rechargeable batteries have become the main product in the battery field. With the expansion of the market, the demand for lithium-ion batteries in frigid regions is also increasing, such as cold-proof shoes and clothing, power supplies for communication equipment in frigid regions, power supplies for scientific research equipment in frigid regions, civilian use in frigid regions, backup power supplies for emergency rescue in frigid regions, and power supplies for electric vehicles in fr...

AI Technical Summary

Problems solved by technology

In the frigid environment, it is required that the battery can still work normally at -40°C to -50°C, but in a low temperature environment, conventional lithium-ion batteries have insurmountable defects

Mainly reflected in: 1) The low-temperature discharge performance is poor, the conventional discharge temperature range is -20 ° C ~ +55 ° C, when it is lower than -20 ° C, it cannot be discharged or the discharge time is short; The required large current; 3) The internal resistance of the battery is large

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