Method for preparing highly conductive multi-layered composite plate

A composite board, high conductivity technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of poor mechanical properties of energy storage batteries, large thickness, small area, etc., to improve battery voltage Efficient, simple and convenient structure design effect

Inactive Publication Date: 2011-08-17
上海林洋储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite plates prepared by these processes have either small area or large thickness. Even if the thickness is small, they often cannot be safely used in energy storage batteries due to poor mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh high-density polyethylene, synthetic graphite powder, expanded graphite and other fillers according to the mass ratio of 8.5:9:2:0.5, and then weigh copolymerized polypropylene, synthetic graphite powder, expanded graphite and other fillers in the same proportion, and place them separately Put it into the internal mixer for mixing, and then extrude and granulate through the single-screw extruder, and put the two kinds of pellets into the two extruders respectively (the temperature of each temperature zone of the extruder is controlled at 180-260°C) , through co-extrusion, a composite conductive plate with a three-layer sandwich structure with a polypropylene matrix on the surface and a high-density polyethylene matrix in the middle can be prepared, with a thickness of 0.5mm. The toughness of the vinyl composite allows weld fusion with the polypropylene fluid frame.

Embodiment 2

[0019] Weigh polypropylene, synthetic graphite powder, highly conductive carbon black and other fillers according to the mass ratio of 4:3:3:0.5, put them directly into the mixer, and then extrude them through a twin-screw extruder to produce Pellets, put the pellets into two extruders (the temperature of each temperature zone of the extruder is 200-260 ° C), through co-extrusion, three-roll calendering (roller temperature is 90 ° C), can prepare the same properties on both sides of the upper and lower sides High conductive composite board (thickness 0.6mm). Compared with the single-layer composite board prepared by the general extrusion and calendering process, the composite board has better mechanical properties, the bending strength can reach more than 45MPa, the volume resistivity is 0.14Ω.cm, and the difference in conductivity is ±0.02Ω. within cm. By replacing the calender roll with a roll with a certain surface texture, the contact points between the surface of the pre...

Embodiment 3

[0021] Weigh polyvinyl chloride, graphite powder, conductive carbon black, etc. according to the mass ratio of 4:3:3, put them into the internal mixer for mixing (the temperature of the internal mixer is 165°C), and then pass through the open mixer (the temperature is 180°C) ℃), calender (roller temperature is controlled at 170-190 ℃), stripping guide rollers, embossing, etc. to prepare a conductive sheet with a certain thickness, and then laminate the sheets to prepare a high-conductivity and high-mechanical Performance laminate (thickness 0.55mm). The bending strength of the composite plate is close to 50MPa, and the volume resistivity is 0.14-0.2Ω.cm.

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Abstract

The invention discloses a method for preparing a highly conductive multi-layered composite plate, which is a carbon plastic conductive composite plate formed by directly fusing and mixing polymer matrix and conductive stuffing in a certain mass ratio and by a multi-layer coextrusion or laminating process, and the resistance of the prepared highly conductive multi-layered composite plate is generally less than 0.5 omega.cm. The types and ratios of the polymer matrix and the conductive stuffing of each layer can be individually designed according o the requirements on conductivity, mechanical property, thickness and the like, the composite can be designed and prepared according to the requirement on the mechanical performance of a battery and the requirement on assembly, and a thin conducting plate can be prepared to fulfill the aim of improving the voltage efficiency of the battery. When the method is used, some structural design of the surface of the highly conductive multi-layered composite can also be performed simply and conveniently to meet the particular demands for application in the field of energy storage.

Description

technical field [0001] The invention relates to a preparation method of a multilayer high-conductivity carbon-plastic composite board, which can be applied to the field of new energy, especially the field of energy storage batteries. Background technique [0002] With the rise of the new energy industry, carbon-plastic conductive composite materials have attracted more and more attention. Selecting a suitable matrix material is a key step in the preparation of high-conductivity composite materials, and the polymer matrix usually used is a thermoplastic polymer, such as polypropylene, polyethylene, etc. The conductivity of composite materials prepared from polypropylene as a matrix is ​​generally better than that of polyethylene-based composites. Polyethylene conductive composites generally have higher toughness, while polypropylene-based composites generally have higher rigidity. The general single-layer extrusion process is difficult to prepare composite panels with excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/18
Inventor 周汉涛
Owner 上海林洋储能科技有限公司
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