Multi-coating intelligent high-safety polymer lithium ion secondary battery

Abstract

The invention discloses a multi-coating intelligent high-safety polymer lithium ion secondary battery. The multi-coating intelligent high-safety polymer lithium ion secondary battery comprises negative plates, positive electrodes, a polyvinylidene fluoride coating diaphragm paper, a colloid electrolyte and a shell, wherein each positive plate contains a temperature-controlled intelligent variable impedance coating; the negative plates and the positive plates are respectively stacked on two surfaces of the polyvinylidene fluoride coating diaphragm paper, and the stacked negative plates, polyvinylidene fluoride coating diaphragm paper and positive plates are wound to form a cell core; the electrolyte solution is injected into the cell core, and then forms the colloid electrolyte through the thermal polymerization; the negative plates and the positive electrodes in the cell core are adhered on two sides of the polyvinylidene fluoride coating diaphragm paper to form a non-liquid polymer cell core; the cell core and the colloid electrolyte are arranged in the shell. An oxide coating is coated on a positive active matter so as to modify the conditions that the positive active matter is oxidized and in heat production when the cell is in a high-charge status, and to improve the security and the circulation of the cell. The security of the intelligent temperature-controlled cell is improved, and the service life of the cell is prolonged.

Description

technical field [0001] The invention relates to the technical field of new energy power batteries, in particular to a lithium-ion secondary battery, in particular to a multi-coated intelligent high-safety polymer lithium-ion secondary battery. Background technique [0002] In recent years, lithium-ion secondary batteries, as high-power and high-current discharge batteries, have become more and more widely used, and the requirements for various performances of batteries are also getting higher and higher. [0003] Batteries with traditional winding structure have high production efficiency and are easy to mass produce, but they are not suitable for high-rate charging, discharging and high-safety occasions [0004] With the expansion of the market, the demand for lithium-ion secondary batteries for high-power-density power equipment is also increasing, such as electric vehicle power supplies, electric tools, and aircraft models. It is required that the battery can still work ...

AI Technical Summary

Problems solved by technology

[0005] 1) When charging and discharging at a high temperature above 65°C, the battery will swell, causing battery failure or safety problems;

[0006] 2) The discharge rate is small, which is usually suitable for continuous discharge at room temperature below 3C, and cannot meet the power requirements required for high-power equipment;

[0007] 3) In the case of acupuncture, extrusion, and heat abuse in the fully charged state, it is easy to catch fire and smoke, causing safety problems;

[0008] 4) When the external circuit fails and causes the battery to overheat, it is easy to catch fire and smoke, causing safety problems

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