Diaphragm lithium battery

Abstract

The invention relates to a diaphragm lithium battery. The diaphragm lithium battery comprises a shell, a positive electrode material, a negative electrode material and a diaphragm. A protection layer is further installed between the negative electrode material and the diaphragm. The protection layer comprises throttling plates which can move horizontally and slide along the shell, and a fixing net located between the two throttling plates. Sliding check blocks are installed on the upper edges and the lower edges of the throttling plates respectively, and the sliding check blocks are matched with sliding grooves formed in the top face and the bottom face of the shell. A throttling ball made of thermal expansion materials is fixed to each joint of the fixing net, and throttling holes are formed in the positions, right opposite to the throttling balls, on the two throttling plates. The diameter of the throttling holes is smaller than that of the throttling balls. Gas outlet one-way valves are formed in the shell. The gas outlet one-way valves are right opposite to the sliding check blocks in position. The diaphragm lithium battery can effectively protect the diaphragm, a short circuit in a battery is prevented, and meanwhile a good overvoltage protection device is arranged.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a diaphragm lithium battery. Background technique [0002] Compared with traditional lead-acid batteries, lithium batteries have obvious advantages, such as higher energy ratio, longer service life, higher rated voltage, lower self-discharge rate, lighter weight, more energy-saving and environmental protection, and many advantages Lithium batteries are widely used in every corner of life; however, the current lithium batteries still have potential safety hazards. In recent years when lithium batteries have been used, there are often reports about lithium battery explosions; one of the common causes of explosions: when When the lithium battery is overcharged, the dendritic lithium atoms accumulated on the negative plate of the battery will pierce the diaphragm and short-circuit the positive and negative electrodes of the battery, causing the battery to explode; in addition, the battery itself ...

AI Technical Summary

Problems solved by technology

[0002] Compared with traditional lead-acid batteries, lithium batteries have obvious advantages, such as higher energy ratio, longer service life, higher rated voltage, lower self-discharge rate, lighter weight, more energy-saving and environmental protection, and many advantages Lithium batteries are widely used in every corner of life; however, the current lithium batteries still have potential safety hazards. In the past few years when lithium batteries have been used, there are often reports about lithium battery explosions; one of the common causes of explosions: when When the lithium battery is overcharged, the dendritic lithium atoms accumulated on the negative plate of the battery will pierce the diaphragm and short-circuit the positive and negative electrodes of the battery, causing the battery to explode; in addition, the battery itself is equipped with safety control devices, but these devices cannot quickly respond to high voltage. Response, unable to open the safety air valve quickly, causing the internal pressure of the battery to rise sharply and cause an explosion

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