A vanadium battery splicing graphite bipolar plate

A technology of bipolar plates and vanadium batteries, which is applied in the field of vanadium batteries, can solve the problems of increasing the amount of conductive bipolar plates, reducing the energy efficiency of the stack, and increasing the cost of materials, so as to reduce the internal leakage current of the battery, accelerate the crystallization speed, and improve The effect of service life

Active Publication Date: 2021-04-13
杭州德海艾科能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bipolar plate has the function of separating the positive and negative electrolytes. The contact of the bipolar plate outside the reaction zone with the electrolyte will increase the leakage current, reduce the energy efficiency of the stack, and even cause a short circuit inside the stack.
Use a conductive bipolar plate to separate the positive and negative electrolytes in the non-reactive area, which increases the amount of conductive bipolar plates, thereby increasing the material cost of the system

Method used

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  • A vanadium battery splicing graphite bipolar plate
  • A vanadium battery splicing graphite bipolar plate
  • A vanadium battery splicing graphite bipolar plate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of vanadium battery splicing graphite bipolar plate, its preparation process is as follows:

[0027] Preparation of conductive plate 1: put expanded graphite and conductive graphite powder into the mold according to the ratio of 90:10, apply a pressure of 30MPa, hold the pressure for 15 minutes, prepare the conductive plate base material, put the conductive plate base material on the engraving machine, The protruding strip structure 12 of the conductive plate 1 is processed and punched with circular holes with a diameter of 1 mm, and the circular holes are evenly arranged. The thickness of the square plate structure 11 of the conductive plate 1 is 1 mm, and the thickness of the protruding strip structure 12 is 0.4 mm.

[0028] Preparation of non-conductive plate 2: Mass fraction components of non-conductive plate 2: polypropylene PP 70%, silicon dioxide 30%. The above raw materials were weighed and mixed uniformly at high speed in a high-speed mixer, and a non-c...

Embodiment 2

[0031] A kind of vanadium battery splicing graphite bipolar plate, its preparation process is as follows:

[0032] Preparation of conductive plate 1: put expanded graphite and conductive graphite powder into the mold according to the ratio of 92:8, apply a pressure of 40 MPa, hold the pressure for 10 minutes, prepare the conductive plate base material, and put the conductive plate base material on the engraving machine, The protruding strip structure 12 of the conductive plate 1 is processed and punched with circular holes with a diameter of 1.5 mm, and the circular holes are evenly arranged. The thickness of the square plate structure 11 of the conductive plate 1 is 2 mm, and the thickness of the protruding strip structure 12 is 0.8 mm.

[0033] Preparation of the non-conductive plate 2: Mass fraction components of the non-conductive plate 2: polyethylene PE 80%, titanium dioxide 20%. The above raw materials were weighed and mixed uniformly at high speed in a high-speed mixe...

Embodiment 3

[0036] A kind of vanadium battery splicing graphite bipolar plate, its preparation process is as follows:

[0037] Preparation of conductive plate 1: put expanded graphite and conductive graphite powder into the mold according to the ratio of 95:5, apply a pressure of 40MPa, hold the pressure for 10 minutes, prepare the conductive plate base material, put the conductive plate base material on the engraving machine, The protruding strip structure 12 of the conductive plate 1 is processed and punched with circular holes with a diameter of 2.0 mm, and the circular holes are evenly arranged. The thickness of the square plate structure 11 of the conductive plate 1 is 3 mm, and the thickness of the protruding strip structure 12 is 1.2 mm.

[0038] Preparation of the non-conductive plate 2: Mass fraction components of the non-conductive plate 2: 70% epoxy resin, 20% titanium dioxide, and 10% silicate. The above raw materials were weighed and mixed in an internal mixer for 10 minutes...

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Abstract

The invention relates to a spliced ​​graphite bipolar plate for a vanadium battery, comprising a conductive plate and a non-conductive plate, the conductive plate covers the electrochemical reaction zone and contacts the electrolyte in the electrochemical reaction zone; the non-conductive plate covers the electrolyte flow channel area, contacting the electrolyte in the electrolyte flow channel area, the conductive plate is a conductive graphite plate, the non-conductive plate is a non-conductive polymer material plate, and the conductive plate and the non-conductive plate are welded by hot pressing; the non-conductive plate The conductive plate is prepared by adding non-conductive materials to polymer resin materials. The invention splices a conductive graphite plate and a non-conductive polymer material plate to form a spliced ​​bipolar plate, has low cost, can reduce battery internal leakage current, and improves battery efficiency.

Description

technical field [0001] The invention relates to the technical field of vanadium batteries, in particular to a vanadium battery spliced ​​graphite bipolar plate. Background technique [0002] At present, the bipolar plate materials of vanadium batteries are mainly graphite bipolar plates and conductive plastic bipolar plates. The bipolar plate also has the function of separating the positive and negative electrolytes. If the bipolar plate outside the reaction zone contacts the electrolyte, the leakage current will increase, the energy efficiency of the stack will decrease, and even cause a short circuit inside the stack. Using a conductive bipolar plate to separate the positive and negative electrolytes in the non-reactive area increases the amount of the conductive bipolar plate, thereby increasing the material cost of the system. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a spliced ​​graphite bipolar plate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/86H01M8/18
CPCH01M4/8657H01M4/96H01M8/188H01M2004/8694Y02E60/50
Inventor 王宇熊仁海吕玉康
Owner 杭州德海艾科能源科技有限公司
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