Battery protection device and protection method

Abstract

The invention discloses a battery protection device and protection method, wherein the protection device comprises a shell made of a thermally conductive and insulating material; the inner side of the shell is provided with a conductive sheet, an elastic sheet and a metal wire, the conductive sheet makes contact with the elastic sheet, the elastic sheet is fixedly connected with one end of the metal wire, and the other end of the metal wire is fixedly arranged on the shell; the metal wire is made of a memory alloy; the outer side of the shell is provided with two guide lines, one guide line is electrically connected with the conductive sheet, and the other guide line is electrically connected with the elastic sheet. The protection method adopts the protection device to absorb the heat of a battery, one guide line is electrically connected with a positive electrode of the battery, and the other guide line is used as a battery positive electrode output guide line. After the battery emits heat, the memory alloy is deformed, the positive electrode of the battery is disconnected from the battery positive electrode output guide line, and the positive electrode of the battery is short-circuited; when the battery is cooled, the memory alloy is restored, the positive electrode of the battery is connected to the battery positive electrode output guide line, and the positive electrode of the battery is put into use. Therefore, the battery is effectively protected, and the protection device has the advantages of low cost, sensitive induction, small size and convenient use.

Description

technical field [0001] The invention relates to the technical field of battery protection, in particular to a battery protection device and a protection method. Background technique [0002] At present, in the electronics industry, lithium batteries are used more and more widely, so battery safety issues are becoming increasingly prominent. In view of the above-mentioned technical problems of battery safety, the measures currently taken are mainly to set up a triple protection mechanism in the single lithium-ion battery. One is to use switching elements. When the temperature inside the battery rises, its resistance value will rise accordingly. When the temperature is too high, the power supply will be automatically stopped; the other is to choose an appropriate separator material. When the temperature rises to a certain value, The micron-sized pores on the separator will automatically dissolve, so that lithium ions cannot pass through, and the internal reaction of the batte...

AI Technical Summary

Problems solved by technology

[0003] However, in the long-term use process, it is found that the battery heating or even explosion caused by the short circuit of the external circuit of the battery is an important risk and hidden danger.

Images