Method for monitoring internal short circuit of battery cell employing three electrodes

Abstract

The invention discloses a method for monitoring an internal short circuit of a battery cell employing three electrodes. The method comprises the steps as follows: a positive electrode lead-out plate, a negative electrode lead-out plate and a reference electrode lead-out plate are arranged; the reference electrode lead-out plate is made of sheet metal lithium; a power battery electrolyte is packaged through an electrolyte sealing film; a cylindrical battery packaging housing is packaged again outside the electrolyte; the positive electrode lead-out plate, the negative electrode lead-out plate and the reference electrode lead-out plate are electrically connected with a positive electrode installation plate, a negative electrode installation plate and a middle connection plate respectively; a voltage monitoring device is arranged outside the battery packaging housing and comprises a one-way conduction unit and a signal transmission circuit; and the one-way conduction unit and the signal transmission circuit are connected with each other in series between the negative electrode installation plate and the middle connection plate. A voltage change between the reference electrode lead-out plate and the negative electrode lead-out plate is timely detected through the reference electrode lead-out plate, so that a control system is timely reminded to take measures to the internal short circuit of a battery.

Description

technical field [0001] The invention relates to the technical field of new energy power lithium batteries, in particular to a method for using three electrodes to monitor the internal short circuit of a battery cell. Background technique [0002] New energy refers to various energy forms other than traditional energy that have just begun to be developed and utilized or are being actively researched and yet to be promoted. New energy can effectively deal with oil crises and environmental pollution, such as solar energy, geothermal energy, and wind energy. , ocean energy, biomass energy and nuclear fusion energy, etc.; the storage, transfer and utilization of new energy is a key link in the promotion of new energy, and it is also a technical problem of key public relations. The storage of new energy mainly uses certain technologies to convert new energy into chemical energy, Potential energy, kinetic energy, electromagnetic energy and other forms make the converted energy have...

AI Technical Summary

Problems solved by technology

In lithium-ion power batteries, since metal lithium can crystallize on the negative electrode to form dendrite lithium, metal lithium is used as the negative electrode active material; however, when the dendrite lithium grows to a certain extent, it will pierce the polymer microporous isolation film, causing the battery internal A short circuit not only causes the lithium-ion power battery to fail to work normally, but even seriously threatens the personal safety of users.