▎ 摘　　要

NOVELTY - Weldable bipolar plates for flow batteries, comprises bipolar plate hot-pressed from a high-conductivity region in the central region and a low-conductivity region in the peripheral region. The low-conductivity area is filled with compound B consisting of high-density polyethylene and carbon-based conductive filler, The carbon-based conductive filler in the mixture A is higher than that of the mixture B. The compound A is high-density polyethylene and carbon-based conductive fillers of different dimensions, 20-30 wt.% high-density polyethylene in the mixture A, The 70-80 wt.% carbon-based conductive filler blends of different dimensions in the mixture A; the mixture B is composed of high-density polyethylene and carbon-based conductive filler, and the high-density polyethylene is in the mixture mass fraction in B is 60-80 wt.%, and 20-40 wt.% carbon-based conductive filler in the mixture B. USE - The weldable bipolar plate for a flow battery is used as an all-vanadium, bipolar plates in zinc/bromine, iron/chromium, all-iron, sulfur/iron, zinc/iron, polysulfide/bromine, and zinc/iodine flow battery systems. ADVANTAGE - The weldable bipolar plate has good conductivity and low resistance contact can realize the integrated molding of bipolar plate and electrode frame by welding technology to realize the condition of not using the sealing ring, fully ensuring the sealing performance of the galvanic pile and safe reliability of operation, improving the service life of the battery, and reducing the assembly cost and the manufacturing cost of the liquid flow battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparing the weldable bipolar plate comprising (1) at 180-240°C, high density polyethylene and three different dimensional carbon-based conductive filler for mixing or banburying, granulating, time is 20-40 minutes to obtain the mixed material A, (2) at 180-240℃, mixing or banburying the high density polyethylene and carbonbased conductive filler, granulating for 20-40 minutes to obtain the mixed material B; (3) filling the mixed material A obtained and the mixed material B obtained in the step (2) according to the area ratio of 1.5-3.7: 1 in the central area and peripheral area of the mold, pressing the mixed material A and the mixed material B into a bipolar plate by means of hot pressing; where hot pressing temperature is set to 180-240℃, the hot pressing pressure is 15-30 MPa, and hot pressing time is 10-30 minutes. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view showing the structure of a bipolar plate.