Safety type power battery system for electric automobile

Abstract

The invention provides a safety type power battery system for an electric automobile. The safety type power battery system comprises an installation box, a power battery pack and an installation box cover, wherein the installation box is provided with a battery installation area and a battery accessory installation area; the power battery pack is fixedly arranged in the battery installation area; the safety type power battery system also comprises a fire extinguisher; the fire extinguisher is arranged on the inner side wall of the installation box; the safety type power battery system further comprises a trigger unit; the trigger unit comprises a sensor module for detecting the fire-fighting state of the power battery pack in the installation box, a vehicle-mounted controller and a fire-righting prompting module; the sensor module is arranged in the installation box and is connected with the vehicle-mounted controller; the vehicle-mounted controller is connected with the fire-righting prompting module and an electric control starting device of the fire extinguisher. The safety type power battery system provided by the invention can be used for effectively monitoring a working state of the power battery pack, and automatically extinguishing in a state of fire behavior or eliminating a power battery in a state that the battery is overheat, so that major safety accidents such as explosion of the power battery are avoided.

Description

technical field [0001] The invention relates to a power battery system, in particular to a safe electric vehicle power battery system. Background technique [0002] With the development of my country's automobile industry, more and more attention has been paid to its emission regulations, fuel economy and comfort. For this reason, electric vehicles are more and more widely used, and the energy storage of electric vehicles is completely different from traditional gasoline and diesel vehicles. Power batteries are mainly used to store and provide energy for driving electric vehicles. [0003] Electric vehicles are powered by power batteries. Because lithium batteries have the advantages of large specific capacity, high working voltage, long cycle life, small size, and light weight, lithium batteries are widely used, but the voltage and capacity of single lithium batteries They are very small, therefore, generally many single batteries are used in electric vehicles to form a bat...

AI Technical Summary

Problems solved by technology

[0004] However, due to the production process and other reasons, there are inevitably some differences in the capacity and performance of each single battery. When an electric vehicle is running, a single battery with a small capacity and poor performance will be over-discharged. Poor single batteries will be overcharged again. If things go on like this, this difference will inevitably become bigger and bigger, making the utilization rate of the battery pack worse and worse.

What's more serious is that in the environment of overcharging or overdischarging, the diaphragm between the positive and negative electrodes of the battery will be broken down and short-circuited, resulting in high temperature, overheating, vaporization of the electrolyte, expansion of the battery case, and even fire. Or explosion, however, there is no technical means to effectively solve the above problems

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