Compound plastic and lithium ion battery and battery pack manufactured by using same and assembling method thereof

Abstract

The invention relates to compound plastic and a lithium ion battery and a battery pack manufactured by using the same and an assembling method thereof. The compound plastic disclosed by the invention comprises the following components in percentage by mass: 30-98 percent of a compound plastic substrate, 1-50 percent of a compound reinforcing material and 1-50 percent of a compound heat conducting filler, wherein the compound plastic substrate comprises the following components in percentage by mass: 0-100 percent of polypropylene, 0-100 percent of polyethylene and 0-10 percent of polyvinylidene fluoride. The invention further provides a lithium ion battery and a battery pack manufactured by using the compound plastic and an assembling method thereof. According to the compound plastic and the lithium ion battery and the battery pack manufactured by using the same and the assembling method thereof, the high requirements of a lithium ion battery encapsulating shell on technical conditions such as heat conductivity, mechanical strength, size stability, corrosion resistance, insulating strength, reliability, service life and the like are fully met.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery packaging, in particular to a composite plastic used for manufacturing lithium-ion batteries, a lithium-ion battery and a battery pack manufactured therefrom, and an assembly method thereof. Background technique [0002] The packaging case of lithium-ion batteries is an important part of lithium-ion batteries. At present, there are three main types of lithium-ion battery structural case packaging: first, the negative electrode lithium-ion battery with a steel casing package, and the second 1. A lithium-ion battery with a positive electrode in an aluminum case package. Third, a lithium-ion battery with a positive electrode in a hidden case packaged in an aluminum-plastic composite material. [0003] When connecting lithium-ion batteries in series to form a battery pack, due to the potential difference between the lithium-ion battery casings of each level, when the lithium-ion batteries ...

AI Technical Summary

Problems solved by technology

However, due to the corrosiveness of the lithium-ion battery electrolyte, the current-collecting heat effect during charging and discharging, and the need for airtight sealing of the battery package, the use of general engineering plastics cannot meet the requirements of the lithium-ion battery shell for electrolyte corrosion resistance and heat conduction. sexual and other technical requirements

However, the existing plastics that are resistant to corrosion by the electrolyte of lithium-ion batteries have problems such as poor thermal conductivity, low mechanical strength, and easy deformation after demoulding.

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