A lithium-ion battery module that suppresses the spread of thermal runaway

Abstract

The invention discloses a lithium ion battery module capable of restraining thermal runaway extension. The lithium ion battery module comprises single lithium ion batteries, thermal insulation cushions, end plates and a thermal conducting system; the thermal conducting system comprises thermal conducting sheets and a water chamber; the thermal conducting sheets are in contact with the water chamber, wherein the thermal conducting sheets, the single lithium ion batteries and the thermal insulation cushions are assembled together in sequence to enable one surface of each single lithium ion battery to be equipped with the corresponding thermal insulation cushion and to enable the other surface of each single lithium ion battery to be equipped with the corresponding thermal conducting sheet; the end plates are mounted at the two ends of the assembled structure; and the assembled structure is compressed tightly by the end plates. According to the lithium ion battery module, the battery pack is tightly compressed by forward pressing force; due to the thermal insulation cushions among the batteries, and the efficient thermal conducting system, the purpose of restraining thermal runaway extension can be fulfilled; and meanwhile, according to the technical scheme, the thermal management for the battery pack under the normal operational conditions is not affected.

Description

technical field [0001] The invention relates to a lithium ion battery module in the technical field of lithium ion batteries, in particular to a lithium ion battery module capable of suppressing the spread of thermal runaway. Background technique [0002] Hybrid Electric Vehicle (HEV for short) and pure electric vehicle (peakenvelope voltage, PEV for short) provide an alternative to the conventional means of driving the car by supplementing the rechargeable battery and completely replacing the traditional internal combustion engine (ICE) with the rechargeable battery. . Among them, various battery architectures such as nickel-hydrogen batteries, lead-acid batteries, lithium-polymer batteries or lithium-ion batteries can be used to provide the motive force and required power for HEVs and PEVs. At present, the application prospects of lithium-ion batteries are the most promising. [0003] Lithium-ion batteries have high energy density, and use flammable organic solvents and ...

AI Technical Summary

Problems solved by technology

[0004] The existing lithium-ion battery modules that have been commercially applied, for example, the famous Nissan Leaf ("Leaf") uses a small module of 2 parallel and 2 strings packaged in an aluminum alloy box. On the basis of this module, the serial Parallel operation, but it has no cooling system, and it does not consider the protection measures under thermal runaway. It is mainly realized through the strategy of ensuring the absolute safety and high reliability of the single battery; another example is the GM Chevrolet Volt extended-range hybrid vehicle battery module, which uses flammable coolant to cool the battery pack, but its protection against thermal runaway is insufficient; another example is a battery module with continuously curved corrugated fins described in the patent publication number CN103066313A, such as figure 1 As shown, when its single battery thermal runaway is also prone to large-scale spread

[0005] It can be seen that there is still room for improvement and improvement in the above-mentioned existing lithium-ion battery modules in suppressing the spread of thermal runaway

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