Lithium-ion battery electrolyte circulation and purification closed-circuit system

Abstract

The invention provides an electrolyte circulation and purification closed-loop system for a lithium ion battery. The lithium ion battery is provided with a battery casing, a plurality of negative plates and a plurality of positive plates arranged alternately in the battery casings, separating plates located between the adjacent negative and positive plates, and an electrolyte disposed in the battery casing. The electrolyte circulation and purification closed-loop system is provided with a monitoring module, a heat exchange module, a component control module, a drive module and a management control module, wherein the monitoring module, the heat exchange module, the component control module and the drive module are all in communication with the interior of the battery casing and are electrically connected with the management control module. The electrolyte circulation and purification closed-loop system has a function of monitoring and proactively adjusting the components of the electrolyte in the battery in real time, and a function of monitoring the temperature of the electrolyte and maintaining the electrolyte stable.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte circulation and purification closed-circuit system for lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile energy storage, electric vehicles, large-scale grid energy storage and other fields due to their excellent characteristics such as high energy density, high output voltage, low self-discharge rate, long service life, no memory effect and environmental friendliness. . In the prior art, most of the batteries used in large-scale power grid energy storage power stations are composed of a large number of small-capacity lithium-ion batteries connected in series and parallel, which puts forward extremely high requirements on the consistency of each lithium-ion battery cell in the battery stack. It also makes the battery management system of the energy storage power station very complicated, which makes t...

AI Technical Summary

Problems solved by technology

[0004] During the cycle, the electrolyte composition of lithium-ion batteries will change, such as the electrolyte LiPF 6 content decreased, H 2 The content of harmful substances such as O, HF, and a series of free radicals increases. These changes will accelerate the occurrence of side reactions inside the lithium-ion battery, damage the structure of the electrode material, and accelerate the aging of the battery.

However, the lithium-ion battery for ultra-large-capacity energy storage in the above-mentioned patent can only monitor the operating state of the battery in real time through the monitoring module, and cannot conveniently update the electrolyte within the battery life cycle to improve the service life of the battery.

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