Lithium ion liquid flow battery system

Abstract

The invention discloses a lithium ion liquid flow battery system which comprises a battery module group, wherein the battery module group comprises a battery module or more than one serially connected battery module; each battery module comprises a battery sub module or more than one parallelly connected battery sub module; each battery sub module comprises at least two connected battery units. A liquid supply system of each battery module forming the battery module group is independent and adopts a positive electrode liquid storage device and a negative electrode liquid storage device respectively; liquid conveying pipelines are independent; each battery sub module is an independent whole capable of feeding and discharging liquid independently; all the battery modules in the battery module group share a dynamic circulating device; positive and negative electrode suspensions are driven by the dynamic circulating device to do periodic reciprocating flowing in a closed space consisting of the liquid storage devices, the liquid conveying pipelines and the battery modules.

Description

technical field [0001] The invention relates to the field of lithium ion flow batteries, in particular to a lithium ion flow battery system. Background technique [0002] Lithium-ion flow battery is a new type of chemical energy storage battery, which combines the advantages of lithium-ion battery and flow battery. The output power of a lithium-ion flow battery depends on the electrode reaction area of ​​the battery and the number of battery cells, while the energy storage capacity depends on the volume and concentration of the electrode suspension. The two can be designed separately, which is a combination of output power and energy storage. A new type of green rechargeable battery with independent capacity, high energy density, flexible charging and discharging switching, fast response, and low cost. The mixture of positive and negative electrode material particles and electrolyte of this new type of lithium-ion flow battery—the electrode suspension, is respectively insta...

AI Technical Summary

Problems solved by technology

Chinese patent CN101047254A discloses a high-power redox flow energy storage stack modular structure and its group mode, which provides a modularized perspective, using electro-hydraulic flow and electro-hydraulic leakage comprehensive loss minimization technology and electro-hydraulic uniformity Distribution technology, however, according to this technology, the liquid supply system of the lithium-ion flow battery is a whole, the battery modules have a great influence on each other, and the lithium-ion flow battery with electronic conductivity to the electrode suspension will generate a large short-circuit current

At the same time, due to the high viscosity of the electrode suspension, a large mechanical loss will be generated when the electrode suspension is circulated by a liquid pump, which seriously reduces the energy efficiency of the battery.

The liquid pump is also easy to cause the leakage of the electrode suspension or contact with the water and oxygen in the atmosphere, causing safety hazards

Chinese patent CN102664280A discloses a configuration method of a pumpless lithium-ion flow battery and its electrode suspension. The battery system uses gravity and gas pressure to circulate the electrode suspension, avoiding the use of liquid pumps, and reducing the mechanical loss of the battery circulation system. and safety hazards, however, the positive and negative electrode suspensions use a liquid storage tank respectively, that is, the electrode suspension that has been charged and discharged and the electrode suspension that has not been charged and discharged are mixed in a liquid storage device, because the electrode suspension has electrons Conductivity will generate a potential difference, resulting in leakage and reducing the coulombic efficiency of the battery

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