Power polymer lithium ion battery

Abstract

The invention discloses a power polymer lithium ion battery which comprises a casing, at least one positive tag and at least one negative tag, wherein the casing is internally provided with a positive film and a negative film; and the positive film and the positive tag, the negative tag and the negative film as well as the positive tag and the negative tag are respectively fixed outside two ends of the casing. The invention improves the structure of one end of the casing, which is provided with the tag into the structure of two ends of the casing, which are respectively provided with the positive tag and the negative tag, so as to lead the capacity conservation rate and the discharge capacity to be improved, has better radiation property, greatly reduces the short circuit pass and the micro short circuit pass because the battery temperature is not obviously changed when in discharge, and improves the safety property. The invention is especially suitable to an electric motor car, is convenient for subsequent batter series and parallel connection assembly, improves the production efficiency of the batter assembly, and greatly improves the property of the batter set.

Description

【Technical field】 [0001] The invention relates to a power type polymer lithium ion battery. 【technical background】 [0002] At present, power polymer lithium-ion batteries have been widely used in electric vehicles, miner's lamps, military and many other fields. This kind of power polymer lithium-ion battery widely uses positive electrode film, negative electrode film, diaphragm, electrolyte and aluminum-plastic film casing, and is manufactured by winding process. It has many advantages such as high specific energy, high output voltage, good safety performance, no memory effect, and small self-discharge. It basically meets the needs of the existing market and has also achieved rapid development. However, with the further development of electric vehicles, especially the rapid development of the electric bicycle industry, higher requirements have been put forward for power polymer lithium-ion batteries, such as lighter weight, higher specific energy, better safety, and use F...

AI Technical Summary

Problems solved by technology

[0004] 1. When the battery is charged and discharged, the current density at the tabs is too high, the heat generated by the battery current collector is unevenly distributed, and the heat is not easy to dissipate, resulting in shrinkage of the battery diaphragm and damage to other internal materials, thereby affecting the performance of the battery

[0005] 2. The cycle performance and high rate performance of the battery are not good enough

[0006] 3. It is easy to cause a short circuit during storage, transportation and assembly of the battery, which poses a safety hazard

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