A Lithium Iron Phosphate Lithium Polymer Lithium Battery Capable of High Current Charge and Discharge

Abstract

The invention discloses a lithium iron phosphate lithium polymer battery that can be charged and discharged with a large current, and aims to provide an iron phosphate iron phosphate that can be charged and discharged with a large current with sufficient discharge capacity, good safety, good durability, and strong high temperature resistance Lithium polymer lithium battery. The present invention includes a battery core, a battery shell wrapped outside the battery core, and an electrolyte filled inside the battery shell. The battery core adopts a stacked sheet structure, including a plurality of stacked positive and negative plates. , and each negative electrode sheet is located between two adjacent positive electrode sheets, a separator is arranged between the adjacent positive electrode sheets and negative electrode sheets, and the positive electrode sheet is formed by coating the positive electrode on the positive electrode current collector The negative electrode sheet is formed by coating the negative electrode slurry on the negative electrode current collector. The invention is applied to the technical field of lithium batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium iron phosphate lithium polymer battery that can be charged and discharged with a large current. Background technique [0002] With the development of science and technology and the progress of electrochemical materials and process technology, people continue to research and develop new battery materials and new batteries. Following nickel-cadmium and nickel-metal hydride rechargeable batteries, rechargeable lithium-ion batteries were developed in 1991, and polymer lithium batteries with better performance were introduced in 1995. [0003] The existing high-rate high-current charging and discharging lithium batteries use lithium cobalt oxide, ternary, and lithium manganese oxide as the positive electrode, and graphite as the negative electrode. The problems of the existing technology are: 1. Insufficient high-current discharge capacity; 2. Poor safety , In par...

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Problems solved by technology

[0003] The existing high-rate high-current charging and discharging lithium batteries use lithium cobalt oxide, ternary, and lithium manganese oxide as the positive electrode, and graphite as the negative electrode. The problems of the existing technology are: 1. Insufficient high-current discharge capacity; 2. Poor safety , especially large-capacity lithium batteries have flatulence, are easy to catch fire, and cannot pass safety tests such as heavy impact and acupuncture; 3. When overcharging, they are prone to flatulence and fail; 4. Poor high temperature resistance

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