Lithium battery with low-temperature self-heating function and working method thereof

Abstract

The invention relates to a lithium battery with a low-temperature self-heating function and a working method thereof. The lithium battery comprises one or two battery cells, and each battery cell comprises a plurality of positive plates, a plurality of negative plates and a plurality of diaphragms, which are alternately wound or superposed; when the lithium battery comprises one battery cell, a heating pole piece is arranged on the outer side of each battery cell; when the lithium battery comprises two battery cells, a heating pole piece is arranged between the battery cells; a temperature sensor is arranged in the battery cell, the heating pole piece is provided with a pole lug, the size of the heating pole piece is larger than that of the positive pole piece and smaller than that of thenegative pole piece, and the positive pole piece and the heating pole piece are connected through a circuit capable of controlling on-off; the heating pole piece and the negative pole piece are connected through a circuit capable of controlling on-off, and the circuit capable of controlling on-off is connected with a battery management system. According to the invention, low-temperature dischargeis satisfied, and other performances do not need to be sacrificed too much or extra cost does not need to be increased too much.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery with a low-temperature self-heating function and a working method thereof. Background technique [0002] Lithium-ion batteries have become the most important chemical energy storage devices because of their high-voltage platform, high specific energy density, low self-discharge, long cycle life, and environmental protection. They are widely used in various energy storage and new energy electric vehicles. At present, in the field of lithium-ion batteries, due to the limitation of the operating temperature window of lithium batteries, many devices powered by lithium batteries cannot be used normally in cold climate conditions, which greatly affects the promotion of green energy in cold areas. [0003] The existing technical solutions are generally divided into two types, external heating and internal heating. In the way of external heating, a heating de...

AI Technical Summary

Problems solved by technology

The active materials of some lithium-ion batteries often have excellent low-temperature performance but poor high-temperature performance, so they cannot be used normally, or batteries that meet low-temperature conditions often have high design requirements, are expensive, and need to sacrifice other aspects of performance. , especially high temperature performance

Images