Battery stack residual liquid cleaning device and method suitable for hydrochloric acid-based flow batteries

Abstract

The invention relates to the technical field of flow batteries, in particular to a battery stack residue cleaning device and method suitable for hydrochloric acid flow batteries. The cleaning device includes a gas blowing mechanism and a waste liquid tank for receiving the electrolyte discharged from the liquid outlet of the battery stack. Heating and humidifying heater and humidifier, the two ends of the cylinder are respectively provided with an air inlet connected to the purge gas source and an air outlet connected to the battery stack liquid inlet. The cleaning method adopts the cleaning device, and the controller mainly controls the working status of the blower, heater and humidifier according to the pressure value information, temperature value information and humidity value information measured by the pressure transmitter, temperature sensor and hygrometer. Make the pressure value, temperature value and humidity value of the purge gas at the air outlet of the cylinder rise and maintain within the target range. It can realize deep cleaning of residual electrolyte inside the battery stack.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to a battery stack residue cleaning device and method suitable for hydrochloric acid flow batteries. Background technique [0002] The liquid flow battery is a new type of high-efficiency electrochemical energy storage device, which breaks through the limitations of the solid content and constant volume of the electrolyte, and realizes the circulation of the electrolyte and the flexible and variable state of the system capacity and power. Meanwhile, a flow battery is a secondary battery technology in which active materials exist in a liquid electrolyte. The positive and negative electrolytes are stored in the positive and negative storage tanks respectively. Under the action of the circulating pump, the positive and negative electrolytes respectively flow from the storage tanks to the positive and negative electrodes of the battery stack to participate in the electrochemical ...

AI Technical Summary

Problems solved by technology

However, due to the slender flow channel and complex form of the collector plate 103, and the strong adsorption of the carbon felt bipolar plate 102, there is often a lot of electrolyte remaining inside the battery stack 1 that cannot be drained, which will seriously affect the battery stack 1 under certain circumstances. Secondary charge and discharge performance and efficiency lead to low overall performance of the flow battery system; in the second case, a large amount of electrolyte will flow around due to lack of constraints due to seal failure and a large amount of hydrogen chloride gas during the complete dismantling of the battery stack 1 Volatile, will make the unstacking environment very bad, seriously affect the health of unstacking operators

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