Battery pack system

Abstract

A battery pack system comprises a plurality of batteries, confining liquid, and a battery box containing the confining liquid; wherein the batteries are soaked in the confining liquid, the battery box is composed of a box body and a cover plate, the box body is provided with a confining liquid outlet and a confining liquid inlet, the outlet is connected to the inlet through a circulating pump and a buffer tank so as to form a circulating path, and a detection part is arranged in the buffer tank. When leakage happens in the batter pack, the electrolyte will flow in the confining liquid, then the confining liquid containing electrolyte goes through the buffer tank, electrolyte in the confining liquid is detected by the detection part in the buffer tank, and the detection part gives off a feedback signal. In this battery pack system, the leaked electrolyte is confined in the fire retardant confining liquid to prevent the electrolyte from contacting the air so as to prevent fire; the rupture of batteries can be detected immediately, and an alarm is given off at the same time, and thus the safety of battery box is improved.

Description

technical field [0001] The invention relates to a battery pack system, in particular to a battery pack system capable of detecting battery leakage. Background technique [0002] At present, battery-powered electric vehicles and electric buses are gradually replacing traditional cars and buses. The battery cell is the main energy storage device on the electric vehicle, and the battery box, as a device for loading the battery cell, is a key component of the electric vehicle, which directly affects the performance of the battery cell and thus affects the performance of the electric vehicle. Due to its excellent power output characteristics and long life, lithium-ion power batteries are currently widely used in electric vehicles. [0003] As the main energy storage device of electric vehicles, the battery cell is generally formed by connecting multiple batteries in series and parallel. During the charging process of the lithium-ion battery, the aprotic solvent in the electrolyt...

AI Technical Summary

Problems solved by technology

[0003] As the main energy storage device of electric vehicles, the battery cell is generally formed by connecting multiple batteries in series and parallel. During the charging process of the lithium-ion battery, the aprotic solvent in the electrolyte will react on the interface between the electrode and the electrolyte. These reactions On the one hand, a passivation film covering the electrode surface is formed, and at the same time, gases such as hydrogen, hydrocarbons, carbon monoxide, and carbon dioxide are generated. These gases will increase the internal pressure of the battery and cause gas swelling, which will seriously affect the performance of the battery. Cycle performance and battery safety performance), when the gas in the battery accumulates to a certain extent, the packaging material of the battery cell will rupture, and the leaked flammable gas will fill the entire battery box. If this process lasts for a long time, the battery box will The gas in the battery box will break through the seal of the battery box and eventually destroy the battery box, so that the air enters the battery box, and it is very easy to cause danger or even explode when encountering flammable gas in the battery box

Images