Safe battery pack

Abstract

The invention relates to a safe battery pack, which includes a safe battery pack shell. A plurality of battery sets in series-parallel connection are installed in the safe battery pack shell. The battery set is formed by series-parallel connection of multiple cylindrical single batteries. A fire detection and extinguishing device is mounted in the battery pack shell, and consists of a fire detection tube and an extinguisher. The fire detection tube is mounted in the gaps formed by the adjacent cylindrical single batteries, and is in connection with the extinguisher. The safe battery pack provided by the invention not only can put out a fire quickly after outbreak of the fire, but also can eliminate hidden fire outbreak dangers before sudden change of temperature and fire outbreak, and has the characteristics of good fire extinguishing effect, high fire extinguishing efficiency, high reliability and high safety performance.

Description

technical field [0001] The invention relates to a safe battery pack. Background technique [0002] Battery packs for electric vehicles generally use multiple single cells for series-parallel combination according to the voltage and capacity requirements of the electric vehicle load. The voltage is increased through series connection, and the capacity is increased through parallel connection. [0003] Due to many accidents, the safety of battery packs for electric vehicles has been paid more and more attention. The safety of battery packs for electric vehicles is a worldwide problem. The use characteristics of battery packs for electric vehicles are incomparable to other power batteries. There are or may be high-speed movements, violent vibrations, high-temperature work, rapid charging and discharging, and potential impacts, stabbings, short circuits, drops, water immersion, fire, and even Possibility of shooting. Therefore, electric vehicles have extremely high requirement...

AI Technical Summary

Problems solved by technology

Because electric vehicles use battery packs to store energy, there are inherently unsafe factors. In the process of energy release, when the heat generation rate of the battery pack is greater than the heat dissipation rate, it will even lead to "thermal runaway", which will lead to a further rise in temperature. It is the main cause of battery pack safety accidents

[0004] Existing battery packs for electric vehicles are composed of large-capacity square batteries, large-capacity circular batteries, or soft-packed batteries in series and parallel. The large capacity of a single battery inherently poses a safety hazard; Control, it is difficult to effectively solve the temperature field consistency, especially the "thermal runaway" in extreme cases; the existing battery packs for electric vehicles only passively cut off the circuit in the event of "thermal runaway", but there is no active control by "thermal runaway". out of control" causing fire and explosion

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