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High power oxidation, reduction liquid energy-storage pile modular structure and its group mode

A liquid flow energy storage, high-power technology, applied in the field of stack modular structure and its group mode, can solve the problems of not meeting the requirements of large-scale production, affecting the normal operation of the stack, and low energy efficiency of the stack. Ensure cycle stability, proper cross-sectional area and length, and stable cycle performance

Active Publication Date: 2007-10-03
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure drop of the fluid passing through the stack is very large, which has a great impact on the sealing of the stack, and electrolyte leakage occurs during operation; the number of cells is too large, and the fluid distribution is uneven, resulting in very uneven voltage distribution and low energy efficiency of the stack. The single cells of the stack are all assembled by welding, and disassembly is particularly difficult. If one section is not good, it will affect the normal operation of the entire stack. The quality of the stack is difficult to control and does not meet the requirements of mass production.

Method used

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  • High power oxidation, reduction liquid energy-storage pile modular structure and its group mode
  • High power oxidation, reduction liquid energy-storage pile modular structure and its group mode
  • High power oxidation, reduction liquid energy-storage pile modular structure and its group mode

Examples

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Embodiment 1

[0046] According to the proposed stack structure and group mode, this embodiment assembles a 10kW all-vanadium redox flow battery stack, including a set of electrolyte pumping device, 8 sub-stacks 5, and each sub-stack 5 contains a sub-unit 13. The sub-unit circuit is an external connection mode. Each sub-unit 13 contains 13 batteries. The liquid inlet mode is all parallel and equidistant in half. The common pipeline 3 for the electrolyte inlet of the stack is twice the cross-sectional area of ​​the inlet and outlet shunts 41 and 42 for the electrolyte of the sub-stack, and the cross-sectional area of ​​the common pipeline 3 for the electrolyte inlet of the sub-stack is the outlet of the electrolyte delivery pump 2 The cross-sectional area is 2 times, and the cross-sectional area of ​​the sub-stack electrolyte inlet shunt 41 is three times the cross-sectional area of ​​the common pipeline of the single battery; the electrode area of ​​the single battery is 850cm 2 , the thickn...

Embodiment 2

[0049] The difference from Example 1 is that each sub-stack adopts two sets of sub-units with a back-to-back combination structure, the sub-unit circuits are built-in connection mode, the structure is more compact, the weight of the battery is reduced by 30%, and the thickness is reduced by 15%.

Embodiment 3

[0051] As shown in Table 1, it is a comparison table of stack current efficiencies of sodium polysulfide / bromine redox flow energy storage battery subunits with two parameter structures. This embodiment will use two different structural parameters of sodium polysulfide / bromine The subunits of the bromine redox flow energy storage battery are compared. The liquid enters and exits from the front of the liquid inlet end plate of a subunit. The cross-sectional area of ​​the pipeline is 0.5cm 2 , the thickness of the single battery is 1.5cm, and the cross-sectional area of ​​the common pipeline of the subunit I is 1.5cm 2 , the thickness of the single battery is 1.0cm, and the cross-sectional area of ​​the liquid inlet shunt of the subunit II is 0.12cm 2 , the length is 15cm, and the cross-sectional area of ​​the liquid inlet shunt of the subunit I is 0.24cm 2 , the length is 8cm; each resistance parameter is converted by the formula R=K×L / S, where L is the length of each liquid ...

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Abstract

A pile modularized structure of high power and redox liquid flow energy storage type is prepared as setting at least one subunit with at least two single cells on each sub-pile, sending electrolyte into each subunit liquid path by electrolyte conveying pump via each sub-pile liquid path and applying isometric bipartition mode on all liquid in and out points at electrolyte pipeline between different sub-piles and different subunits.

Description

technical field [0001] The invention relates to chemical power energy storage technology, in particular to a stack modular structure and a group mode of a high-power redox flow energy storage battery. Background technique [0002] Electric energy is an indispensable commodity that is difficult to store, and its production must meet the demand for electricity at any time. Therefore, people have been looking for economically feasible energy storage technologies to balance supply and demand and stabilize power supply. Electric energy storage plays an important role in the following aspects: performing electric energy management, assisting power generation during peak power consumption, balancing loads to maintain the stability of the grid; providing grid auxiliary services, including frequency regulation, running backup, fixed reserves, and long-term reserves; Scattered on the nodes of power transmission and distribution, voltage control is performed to improve power quality an...

Claims

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Application Information

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IPC IPC(8): H01M8/04H01M2/40H01M6/42H01M10/00H01M14/00C25B9/00C25B15/06H01M50/77
CPCY02E60/50
Inventor 张华民周汉涛赵平高素军陈剑衣宝廉
Owner DALIAN RONGKE POWER
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