Zinc-bromine flow battery diaphragm applicable to laser welding, and preparation method thereof

A zinc-bromine flow battery and laser welding technology, applied in fuel cells, battery pack components, circuits, etc., can solve problems such as negative effects and no records

Active Publication Date: 2014-03-05
江苏恒安储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is stated in the description that "if necessary, additives such as antioxidants, ultraviolet absorbers, lubricants, anti-blocking agents, colorants, and flame retardants can be added, provided that these additives do not have a negative impact on the purpose of the present invention", but It does not record which types of additives to add and how much to add will not have a negative impact on the purpose of the invention, that is, there is no record of a feasible technical solution; moreover, the purpose of the invention of this patent is to obtain heat resistance, stress crack resistance and electrical properties Excellent separator, no question of whether it can be used for laser welding

Method used

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  • Zinc-bromine flow battery diaphragm applicable to laser welding, and preparation method thereof
  • Zinc-bromine flow battery diaphragm applicable to laser welding, and preparation method thereof
  • Zinc-bromine flow battery diaphragm applicable to laser welding, and preparation method thereof

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Embodiment 1

[0059] Embodiment 1 of the present invention: a method for preparing a zinc-bromine flow battery diaphragm suitable for laser welding, comprising the following steps:

[0060] (1) Weigh the specific surface area as 200m 2 / g of fumed silica (brand AEROSIL200) 240g and plasticizer (special oil for PE separators) 500g, mix and stir for 30 minutes;

[0061] (2) Weigh 240g of PE raw materials (120g of UHMWPE with a molecular weight of 5 million and 120g of HDPE with a molecular weight of 200,000), 10g of a color masterbatch (such as plasblak un2014) that absorbs 900-1000nm laser energy and 10g of an antioxidant, and add the mixture obtained in step (1) In the material, stir again for 30 minutes;

[0062] (3) The mixture obtained in step (2) enters the extruder through the feeder, extruded through the "T" die of the extruder, and then rolled to a thickness of 0.6mm by four-roll calendering. The melt temperature at exit is 180°C, the extrusion pressure is 15Mpa, and the melt resid...

Embodiment 2

[0064] Embodiment 2 of the present invention: a method for preparing a zinc-bromine flow battery separator suitable for laser welding, comprising the following steps:

[0065] (1) Weigh the specific surface area as 300m 2 / g of fumed silica 300g and plasticizer (special oil for PE separator) 350g, mix and stir for 30 minutes;

[0066] (2) Weigh 320g of PE raw materials (192g of UHMWPE with a molecular weight of 5 million and 128g of HDPE with a molecular weight of 150,000), 20g of a color masterbatch (such as Polyblack-2778) that absorbs 900-1000nm laser energy and 10g of an antioxidant, and add the obtained product in step (1) In the mixture, stir again for 30 minutes;

[0067] (3) Feed the mixture obtained in step (2) into the extruder for extrusion molding, use a "T" die to extrude the sheet, and then use four-roll calendering to calender to a thickness of 0.8mm. The melt temperature is 170°C, the extrusion pressure is 10Mpa, and the melt residence time is 1min;

[0068]...

Embodiment 3

[0069] Embodiment 3 of the present invention: a method for preparing a zinc-bromine flow battery diaphragm suitable for laser welding, comprising the following steps:

[0070] (1) Weigh the specific surface area as 100m 2 100g of fumed silica per gram and 650g of plasticizer (30% DOP is added to the special oil for PE separator), mix and stir for 30 minutes;

[0071] (2) Weigh 180g of PE raw materials (120g of UHMWPE with a molecular weight of 4 million and 60g of HDPE with a molecular weight of 50,000), 50g of a color masterbatch (such as plasblak un2014) that absorbs 900-1000nm laser energy, and 20g of an antioxidant, and add the mixture obtained in step (1) In the material, stir again for 30 minutes;

[0072] (3) Feed the mixture obtained in step (2) into the extruder for extrusion molding, use a "T" die to extrude the sheet, and then use four-roll calendering to calender to a thickness of 1.0mm. The melt temperature is 200°C, the extrusion pressure is 20Mpa, and the melt...

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Abstract

The invention discloses a zinc-bromine flow battery diaphragm applicable to laser welding, and a preparation method thereof. The zinc-bromine flow battery diaphragm is prepared by mixing the following active ingredients in parts by weight: 10-35 parts of silica, 25-65 parts of plasticizer, 10-40 parts of PE (polyethylene) raw materials, 1-5 parts of color master batch with laser energy of 900-1000nm, and 1-2 parts of antioxidant. Compared with the prior art, by adding a certain amount of color master batch absorbing infrared rays into active ingredients, not only is the zinc-bromine flow battery diaphragm endowed with the laser welding capability, but also no obvious adverse influence on the physical properties of bromine transmittance, resistance and the like exists, and the performance requirement of the diaphragm can be guaranteed; in addition, the zinc-bromine flow battery diaphragm and a bipolar plate as well as a frame are laser-welded, so that the sealing property of a zinc-bromine battery can be effectively promoted, and the long-term stability of the battery can be enhanced.

Description

technical field [0001] The invention relates to a zinc-bromine flow battery diaphragm suitable for laser welding and a preparation method thereof, belonging to the technical field of zinc-bromine flow batteries. Background technique [0002] In the prior art, the sealing connection between the thermoplastic resin material frame of the zinc-bromine flow bipolar battery, the bipolar plate and the diaphragm has always been a thorny problem. At present, the sealing between the thermoplastic resin frame and the bipolar plate and diaphragm is achieved by heat welding, vibration welding integration or adhesive bonding. These sealing methods are complex in process, low in pass rate, and welding reliability poor. [0003] In order to overcome the shortcomings of the above-mentioned sealing method, a method of using laser welding liquid flow bipolar battery frame, bipolar plate and diaphragm has been invented; the laser welding method has simple process and high reliability, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/409
CPCH01M8/0269Y02E60/50
Inventor 刘学军孟琳陆克
Owner 江苏恒安储能科技有限公司
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