Search

CN-224232654-U - Flow battery runner bipolar plate with insulated central conductive edge

CN224232654UCN 224232654 UCN224232654 UCN 224232654UCN-224232654-U

Abstract

The utility model belongs to the technical field of flow battery bipolar plates, and particularly relates to a flow battery runner bipolar plate with an insulated central conductive edge. The flow battery flow channel bipolar plate with the insulated central conductive edge comprises a conductive substrate, wherein the conductive substrate consists of an electrochemical reaction area and an insulation area, the insulation area is positioned at the periphery of the electrochemical reaction area, the electrochemical reaction area and the insulation area are integrally formed, a plurality of flow channels are arranged on the surface of the electrochemical reaction area, flow channels of the upper electrochemical reaction area and the lower electrochemical reaction area of the conductive substrate are mutually staggered, a flexible graphite film is adhered to the surface of a non-flow channel of the electrochemical reaction area, the geometric dimension of the flexible graphite film is the same as the surface dimension of the non-flow channel of the electrochemical reaction area, and a corrosion-resistant insulation layer is arranged on the insulation area. The bipolar plate realizes that the thickness of the bipolar plate is not obviously increased by deepening the flow channel, has high corrosion resistance, can effectively prevent electrolyte from leaking, improves the sealing performance and the safety of the battery, reduces the corrosion risk and prolongs the service life of the battery.

Inventors

  • WANG YUNLONG
  • CHEN HUI
  • DING JIANGXIN
  • XU JIABIN

Assignees

  • 江苏深储新材料有限公司

Dates

Publication Date
20260512
Application Date
20250611

Claims (8)

  1. 1. A center conductive edge insulated flow battery flow channel bipolar plate comprising: The electrochemical reaction device comprises a conductive substrate (1) and a conductive substrate, wherein the conductive substrate consists of an electrochemical reaction area (101) and an insulation area (102), the insulation area (102) is positioned at the periphery of the electrochemical reaction area (101), the electrochemical reaction area (101) and the insulation area (102) are integrally formed, a plurality of flow channels (103) are arranged on the surface of the electrochemical reaction area (101), and the flow channels (103) of the upper electrochemical reaction area and the lower electrochemical reaction area (101) of the conductive substrate (1) are mutually staggered; A flexible graphite film (2) adhered to the surface of the non-flow channel (103) of the electrochemical reaction zone (101), wherein the geometry of the flexible graphite film (2) is the same as the surface of the non-flow channel (103) of the electrochemical reaction zone (101); and a corrosion-resistant insulating layer (3) disposed on the insulating region (102).
  2. 2. The flow battery flow channel bipolar plate with the central conductive edge insulation according to claim 1, wherein the conductive substrate (1) is provided with an insulation area (102) by thinning front and back edge layers, the thinning depth is the thickness difference between the corrosion-resistant insulation layer (3) and the flexible graphite film (2), and the thinning width is consistent with the width of the corrosion-resistant insulation layer (3).
  3. 3. The flow battery flow channel bipolar plate with central conductive edge insulation according to claim 1, wherein the corrosion resistant insulation layer (3) is arranged on the insulation region (102) to a height consistent with the height of the electrochemical reaction region (101) to which the flexible graphite film (2) is adhered.
  4. 4. The center conductive edge insulated flow cell flow channel bipolar plate of claim 1 wherein the depth of the flow channel (103) is greater than half the thickness of the conductive substrate (1).
  5. 5. The center conductive edge insulated flow battery runner bipolar plate of claim 1, wherein the runners (103) are parallel to each other.
  6. 6. The flow battery flow channel bipolar plate with central conductive edge insulation according to claim 1, wherein the conductive substrate (1) is a high strength, low conductivity carbon composite.
  7. 7. The flow battery flow channel bipolar plate with central conductive edge insulation according to claim 1, wherein the flexible graphite film (2) is a natural graphite paper or artificial graphite film with low strength and high conductivity.
  8. 8. The flow battery flow channel bipolar plate with central conductive edge insulation according to claim 1, wherein the corrosion resistant insulating layer (3) is made of thermoplastic resin without conductive filler added.

Description

Flow battery runner bipolar plate with insulated central conductive edge Technical Field The utility model belongs to the technical field of flow battery bipolar plates, and particularly relates to a flow battery runner bipolar plate with an insulated central conductive edge. Background The flow battery is used as a high-performance electrochemical energy storage device, and is widely applied to a large-scale energy storage system due to the advantages of high energy conversion efficiency, long cycle life, deep charge and discharge and the like. Bipolar plates are one of the key components in flow batteries, which not only serve to separate the different electrolytes, but also serve the important functions of conducting current and supporting the cell structure. The carbon composite bipolar plate is one of the main technical routes of the bipolar plate of the flow battery, and most of the electrochemical reaction area and the non-electrochemical reaction area of the bipolar plate are made of uniform materials, and the main technical problems are that the electrochemical reaction area is poor in conductivity, the non-electrochemical reaction area is easy to generate electrochemical corrosion, and the thickness of the bipolar plate is increased due to the depth of a runner. The traditional method for improving the conductivity of the electrochemical reaction area is to increase the content of conductive filler of the bipolar plate, but the method can reduce the mechanical property of the bipolar plate, and the main method for improving the corrosion resistance of the non-electrochemical reaction area is to replace the non-electrochemical reaction area with an insulating material or cover the non-electrochemical reaction area with a layer of insulating film, wherein the replacement of the insulating material is easy to cause the phenomena that the material combination of the electrochemical reaction area is unstable and the separation occurs in the running process of the battery. Covering the insulating film easily results in two conditions, namely, when the insulating film is thinner (less than 100 mu m), the insulating film is damaged in the welding process of the flow battery with a welded structure, the conductive substrate is directly exposed, and when the insulating film is thicker, the thickness of the battery is obviously increased, and the contact between the bipolar plate and the electrode is worsened. Taking 100 μm insulating film as an example, the thickness of the stack is increased by 24mm for a conventional 60-group cell stack, and in addition, the thickness of the bipolar plate is increased due to the depth of the flow channel, so that a trade-off between the increase of the depth of the flow channel and the thinning of the thickness of the bipolar plate is generally required in practical application. Therefore, there is a need for bipolar plates of carbon composite materials that not only meet the insulation requirements of non-electrochemical reaction zones, but are corrosion resistant, weldable, and do not increase the thickness of the bipolar plates, wherein the electrochemical reaction zones have increased conductivity without affecting the mechanical properties of the bipolar plates, and wherein the increase in flow channel depth is avoided as much as possible. Disclosure of utility model The utility model provides a flow battery runner bipolar plate with a central conductive edge insulation. The bipolar plate solves the problems that the existing bipolar plate has poor conductivity and the non-electrochemical reaction area is easy to generate electrochemical corrosion, increases the depth of a flow channel and avoids increasing the thickness of the bipolar plate as much as possible, and provides a more reliable solution for large-scale application of a flow battery. In order to achieve the above object, the present utility model provides the following technical solutions. A center conductive edge insulated flow battery flow channel bipolar plate comprising: The electrochemical reaction device comprises a conductive substrate 1, a conductive substrate 1 and a conductive substrate, wherein the conductive substrate consists of an electrochemical reaction area 101 and an insulating area 102, the insulating area 102 is positioned at the periphery of the electrochemical reaction area 101, and the electrochemical reaction area 101 and the insulating area 102 are integrally formed; A flexible graphite film 2 adhered to the surface of the non-flow channel 103 of the electrochemical reaction zone 101, wherein the geometric dimension of the flexible graphite film 2 is the same as the surface dimension of the non-flow channel 103 of the electrochemical reaction zone 101; a corrosion resistant insulating layer 3 is disposed on the insulating region 102. Further, the insulating region 102 is obtained by thinning the front and back edge layers of the conductive substrate 1, the thinning depth is the th