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CN-121983612-A - Electrode frame plate and galvanic pile structure of flow battery

CN121983612ACN 121983612 ACN121983612 ACN 121983612ACN-121983612-A

Abstract

The invention relates to the technical field of flow batteries and discloses an electrode frame plate and a galvanic pile structure of a flow battery, which comprises a frame plate structure formed by two frame plate assemblies and an ion exchange membrane, wherein the frame plate assemblies are formed by clamping a graphite plate and a frame plate sealing piece by a first upper frame plate and a first lower frame plate or a second upper frame plate and a second lower frame plate, the first upper frame plate and the second upper frame plate adopt a ladder structure, the graphite plate and the frame plate sealing piece are embedded in a groove, the frame plate sealing piece is covered on the graphite plate, finally, the first lower frame plate and the second lower frame plate are covered on the frame plate sealing piece to form a frame plate assembly, and then, the two frame plate assemblies sequentially clamp a carbon felt, the ion exchange membrane sealing piece and the carbon felt in the middle to form a single cell.

Inventors

  • ZHENG XIANGYU
  • ZHENG HAIGUANG
  • HE YONGQIANG
  • TAN LIZHEN
  • Ni Yugui

Assignees

  • 浙江聚合储能科技有限公司

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. Electrode frame plate and galvanic pile structure of flow battery, including frame plate structure (1) that comprises two frame plate assemblies and ion exchange membrane (13), the frame plate assembly is by first last frame plate (11) and first lower frame plate (111) or second last frame plate (12) and second lower frame plate (121) clip graphite board (14) and frame plate seal (16) form, its characterized in that: The first upper frame plate (11) and the second upper frame plate (12) are identical in structure, a stepped structure is adopted at the arrangement positions of the graphite plate (14) and the frame plate sealing piece (16), the graphite plate (14) and the frame plate sealing piece (16) are respectively embedded in the steps, the graphite plate (14) is arranged on the lowest step, the frame plate sealing piece (16) covers the graphite plate (14), the first lower frame plate (111) and the second lower frame plate (121) cover the frame plate sealing piece (16) to form a frame plate assembly, and the two frame plate assemblies sequentially clamp the carbon felt (15), the ion exchange membrane (13), the ion exchange membrane sealing piece (17) and the carbon felt (15) in the middle to form a single cell.
  2. 2. The electrode frame plate and pile structure of flow battery according to claim 1 characterized in that carbon felt (15) is embedded in the grooves of the first upper frame plate (11) and the second upper frame plate (12) at the adjacent position of the first lower frame plate (111) and the second lower frame plate (121) and is contacted with graphite plate (14), and the integral thickness of the frame plate assembly is the same as that of the first upper frame plate (11) or the second upper frame plate (12).
  3. 3. The electrode frame plate and stack structure of a flow battery according to claim 1, wherein the ion exchange membrane sealing member (17) extends to the outer side of the edge of the ion exchange membrane (13), and seals between the ion exchange membrane (13) and the electrode frame plate combination to cover the connection between the first upper frame plate (11) and the first lower frame plate (111) and between the second upper frame plate (12) and the second lower frame plate (121).
  4. 4. The electrode frame plate and stack structure of a flow battery according to claim 2, wherein the frame plate sealing member (16) is provided with a wave-shaped geometric structure on one side facing the first upper frame plate (11) or the second upper frame plate (12).
  5. 5. The electrode frame plate and pile structure of flow battery according to claim 4, characterized in that the wave-shaped structure of the frame plate sealing member (16) has gradually changed wave peaks, the wave peak height is highest at the side far from the graphite plate (14), and the wave peak height is lowest at the side near to the graphite plate (14), and a smooth transition design is adopted.
  6. 6. The electrode frame plate and pile structure of flow battery according to claim 5, characterized in that the frame plate sealing member (16) is of three-layer integrated design, and is divided into a sealing contact layer (161), a wave-shaped layer (162) and a basic supporting layer (163) from top to bottom, wherein the sealing contact layer (161) is contacted with the first upper frame plate (11) or the second upper frame plate (12), and the sealing contact layer (161), the wave-shaped layer (162) and the basic supporting layer (163) are formed by adopting a multi-material coinjection molding technology.
  7. 7. The electrode frame plate and stack structure of a flow battery according to any one of claims 1 to 6, wherein the frame plate sealing member (16) is made of fluororubber, and the frame plate sealing member (16) and the ion exchange membrane sealing member (17) are sealed with rubber.
  8. 8. The electrode frame plate and pile structure of flow battery according to claim 1, characterized in that the first upper frame plate (11) and the second upper frame plate (12) are provided with a boss (1101) on one face towards the ion exchange membrane (13), and the bosses (1101) on the first upper frame plate (11) and the second upper frame plate (12) are arranged in a staggered manner.
  9. 9. The electrode frame plate and stack structure of a flow battery according to claim 8, wherein the overall thickness of the boss (1101) is not greater than the sum of the ion exchange membrane (13) and the ion exchange membrane seal (17).
  10. 10. The electrode frame plate and pile structure of flow battery according to claim 2, characterized in that the stepped grooves for arranging graphite plate (14) and frame plate sealing member (16) in the first upper frame plate (11) and the second upper frame plate (12) are the same.

Description

Electrode frame plate and galvanic pile structure of flow battery Technical Field The invention relates to the technical field of flow batteries, in particular to an electrode frame plate and a galvanic pile structure of a flow battery. Background As a high-efficiency and long-life large-scale energy storage technology, the all-vanadium redox flow battery has wide application prospect in the fields of smart power grids, renewable energy smooth output, distributed energy systems and the like due to the advantages of independent design of power and capacity, high safety, environmental friendliness and the like. The cell stack is used as a core component of the flow battery and is formed by connecting a plurality of single cells in series, the operation stability, the energy efficiency and the service life of a battery system are directly determined by the sealing performance of an electrolyte circulation channel in the cell stack, and in the operation process of the cell stack, positive and negative electrolyte circularly flows on two sides of an ion exchange membrane, if the cell stack is not tightly sealed, the leakage of the electrolyte can be caused to cause environmental pollution and resource waste, internal leakage can be possibly caused, the mutual connection of the positive and negative electrolyte is caused, the aging of the membrane is accelerated, the coulomb efficiency of the battery is reduced, and even safety accidents such as short circuit and the like are caused. The patent number CN102842730B discloses an all-vanadium flow battery, a single-piece battery between positive and negative flow frame plates and like products on the market in the patent are generally composed of a frame plate A, a frame plate B, a graphite plate and sealing elements, the frame plate A and the frame plate B clamp the graphite plate and the sealing elements in the middle to form an assembly of the frame plate AB, the two frame plate AB assemblies clamp carbon felt-sealing elements-ion film-sealing elements-carbon felt to form a single battery, 6 sealing elements are needed for each group of batteries with the structure, the needed sealing surfaces and the needed leakage points are too many, and electrolyte leakage of a galvanic pile is easy to cause, so that a high-reliability galvanic pile structural scheme with reasonable structure, material durability and convenient assembly is needed to be developed to cope with complex working conditions in long-term running of the galvanic pile, the overall sealing performance of the all-vanadium flow battery is improved, the service life of the galvanic pile is prolonged, and the operation and maintenance cost is reduced. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides an electrode frame plate and a galvanic pile structure of a flow battery, which have the advantage of simple sealing structure and solve the problems of more sealing elements and increased leakage points. (II) technical scheme The electrode frame plate and the galvanic pile structure of the flow battery comprise a frame plate structure composed of two frame plate assemblies and an ion exchange membrane, wherein the frame plate assemblies are formed by clamping a graphite plate and a frame plate sealing piece by a first upper frame plate and a first lower frame plate or a second upper frame plate and a second lower frame plate, the first upper frame plate and the second upper frame plate adopt a ladder structure, the graphite plate and the frame plate sealing piece are embedded in a groove, the frame plate sealing piece is covered on the graphite plate, finally the first lower frame plate and the second lower frame plate are covered on the frame plate sealing piece to form a frame plate assembly, and the two frame plate assemblies sequentially clamp a carbon felt, the ion exchange membrane sealing piece and the carbon felt in the middle to form a single battery. The carbon felt is embedded in the grooves of the first upper frame plate and the second upper frame plate, is adjacent to the first lower frame plate and the second lower frame plate and is in contact with the graphite plate, and the integral thickness of the frame plate assembly is the same as that of the first upper frame plate or the second upper frame plate. The ion exchange membrane sealing member extends to the outer side of the edge of the ion exchange membrane, and plays a role in sealing the combination of the ion exchange membrane and the electrode frame plate, so that the ion exchange membrane sealing member covers the connection parts between the first upper frame plate and the first lower frame plate and the connection parts between the second upper frame plate and the second lower frame plate. The frame plate sealing member is provided with a wave-shaped geometric structure towards one side of the first upper frame plate or the second upper frame plate. The height o