Heat-insulation, fireproof and explosion-proof battery pack

Abstract

The invention provides a heat-insulation fireproof and explosion-proof battery pack comprising a plurality of lithium ion battery cells, which are connected, in a firstly in parallel and then in series manner, to form a lithium ion battery pack. The lithium ion battery pack is arranged in a case comprising a case inner layer and a case outer layer. The case is made from phenolic resin, and the case inner layer and / or the case outer layer are coated with a heat-insulation fireproof layer, which is a melamine thermosetting foam flame retarding layer. An explosion-proof exhaust pipe is sealedly installed on the upper end of a side surface of the case. A waterproofing and breather valve is sealedly connected to an end of the explosion-proof exhaust pipe through threads. Each lithium ion battery cell includes: a top cover, a positive pole, a negative pole, an electrolyte, and a diaphragm located between the positive pole and the negative pole. The diaphragm is made from a ceramic material; the negative pole is made from carbon nano tubes; the positive pole is made from lithium iron phosphate; and the electrolyte is a polymer gel electrolyte or lithium hexafluorophosphate. The battery pack has excellent flame-retarding and explosion-proof properties, and is significantly improved in security performance.

Description

technical field [0001] The invention relates to the technical field of battery pack application safety, in particular to a heat-insulated, fireproof and explosion-proof battery pack. Background technique [0002] In recent years, with the increasingly serious energy and environmental problems, driven by industrial policies and markets such as energy conservation and emission reduction, green credit, and green securities, electric vehicles are gradually attracting the attention of the society and the government, and electric vehicles will also become the future A large branch of the automotive industry. One of the core components of electric vehicles is the battery pack. The safety performance of the battery pack is the key technology to determine whether the system is available. [0003] With the advancement of technology, the application fields of lithium-ion power battery systems are becoming wider and wider, and the performance and safety requirements of lithium-ion pow...

AI Technical Summary

Problems solved by technology

In order to meet the power and energy requirements, when electric vehicles are driven by batteries, hundreds of single cells need to be connected in series and parallel. Generally, dozens of single cells are packaged in parallel to form a battery module, and then several battery modules are connected in series to form a battery module. A battery pack, and finally put the battery pack into the battery box. When the battery pack is in an extreme working environment, due to short circuit, thermal runaway, etc., the battery pack will smoke, explode, burn, etc. There is no other safety for the battery pack to catch fire and burn. The treatment structure and measures are often caused by the internal fire of the battery pack, which causes the surface temperature of the box to be too high, causing the combustibles on the battery box and the vehicle to ignite and burn, resulting in electric vehicle combustion accidents

Images