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Multi-layer co-extrusion cooling pipe and preparation method

A multi-layer co-extrusion and cooling tube technology, applied in chemical instruments and methods, tubes, rigid tubes, etc., can solve problems such as reducing battery life, safety accidents, stress cracking, etc., to improve operational reliability and improve service life. , Excellent corrosion resistance effect

Inactive Publication Date: 2020-12-25
扬州华光新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, water pipes are mostly made of single-layer PP (polypropylene), PA (polyamide), HDPE (high-density polyethylene) or compounded by PP+PA, but there are the following defects: PP, PA can withstand 120°C high temperature condition and can be shaped and processed at 150°C high temperature to meet the space requirements of the battery pack, but its water penetration resistance is weak; while HDPE has a certain water penetration resistance, but its melting point is low (130°C) and cannot adapt to 150°C It is easy to be brittle and stress cracked, which cannot meet the layout requirements of bending and coiling in the battery pack; the inside of the battery pack is a closed space, and water leakage will greatly reduce the service life of the battery and even cause Safety accidents, so the existing water pipes are difficult to be directly applied to the battery pack for liquid cooling

Method used

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  • Multi-layer co-extrusion cooling pipe and preparation method
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  • Multi-layer co-extrusion cooling pipe and preparation method

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preparation example Construction

[0040]A kind of preparation method of multi-layer co-extrusion cooling pipe, the preparation of the silane cross-linked high-density polyethylene in the pipe raw material, comprises the following steps:

[0041] S1: Weigh 3~7 parts by mass of catalyst and 93~97 parts by mass of grafting material, optionally, add up to 1 part by mass of masterbatch to make the pipe have a specific color, and mix the mixture of each component evenly ;

[0042] S2: Put the homogeneous mixture obtained in S1 into the extruder, melt and knead it and then extrude it. Among them, the length-to-diameter ratio of the extruder screw is 20~25, the compression ratio (2.5~3): 1; the spiral cooling water temperature is about 60°C ;The mesh number of the filter group is 30-50-100 mesh;The extrusion stretch ratio is ≤2:1;Extrusion temperature: 140°C for the first zone, 175°C for the second zone, 185°C for the third zone, 195°C for the fourth zone, 205°C, die head 210°C;

[0043] S3: Immerse the extruded pro...

Embodiment 1

[0055] Multi-layer co-extruded cooling pipes are three-layer structure (see figure 1 ), including a protective layer 1, a bonding layer 2 and a modified HDPE layer 3 arranged in sequence from outside to inside; the protective layer 1 is PA12, and the bonding layer 2 is a commercially available common adhesive resin, modified HDPE Layer 3 is made of catalyst with 7 parts by mass and grafting material with 93 parts by mass; the thickness of protective layer 1 is 0.1~0.5mm, the thickness of adhesive layer 2 is 0.05~0.15mm, and the modified HDPE layer The thickness of 3 is 0.05~0.90mm, the outer diameter of the pipe is 13~18mm, and the wall thickness of the pipe is 0.95~1.40mm.

Embodiment 2

[0057] The multi-layer co-extruded cooling pipe has a three-layer structure, including a modified HDPE layer, a bonding layer and a protective layer arranged in sequence from the outside to the inside; the protective layer is PA12, and the bonding layer is a commercially available common adhesive resin, modified HDPE The layer is made of a catalyst with a mass part of 5 and a graft material with a mass part of 95; the thickness of the protective layer is 0.1~0.5mm, the thickness of the adhesive layer is 0.05~0.15mm, and the thickness of the modified HDPE layer is 0.05~ 0.90mm, the outer diameter of the pipe is 18.5~23mm, and the wall thickness of the pipe is 1.25~1.55mm.

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Abstract

The invention discloses a multi-layer co-extrusion cooling pipe and a preparation method. The invention relates to the technical field of cooling pipes, in particular to a cooling water path pipe in anew energy automobile battery pack. The invention provides the multi-layer co-extrusion cooling pipe which is resistant to permeation and environment stress cracking and is suitable for new energy vehicle battery pack heat dissipation application occasions, and the preparation method. A multi-layer structure of the pipe is manufactured through co-extrusion of multiple layers of molds and then curing molding; the pipe comprises at least one protective layer and at least one modified high-density polyethylene (HDPE) layer; the protective layer and the modified HDPE layer are arranged at intervals; bonding layers are arranged between the layers arranged at intervals; and the modified HDPE layer is made of silane crosslinked high-density polyethylene. According to the multi-layer co-extrusioncooling pipe and the preparation method provided by the invention, the service life of the battery pack is greatly prolonged, meanwhile, the operation reliability of the battery pack is improved, andthe risks of safety accidents such as electric leakage and fire catching are reduced.

Description

technical field [0001] The invention relates to the technical field of cooling pipes, in particular to a cooling water pipe inside a battery pack of a new energy vehicle. Background technique [0002] With the development of the new energy automobile industry, domestic and international markets have higher and higher cooling requirements for the battery system of new energy vehicles. The cooling pipeline structure originally borrowed from fuel vehicles is increasingly unable to meet the requirements of new energy vehicles for the cooling system, especially the requirements for water penetration of plastic pipelines in the battery pack. The fundamental reason is: the overall sealing structure of the battery pack and The battery insulation environment in the bag requires that the water penetration of the cooling liquid plastic pipeline in the bag should be as low as possible in the high temperature working environment. [0003] As the power source of new energy vehicles, batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/12B29D23/00B32B1/08B32B27/32B32B7/12B32B27/34B32B27/08B32B33/00
CPCB29D23/001B29K2023/065B32B1/08B32B7/12B32B27/08B32B27/32B32B27/34B32B33/00B32B2250/24B32B2250/40B32B2307/306B32B2307/714B32B2597/00F16L9/12
Inventor 任浩鹏冯志坚
Owner 扬州华光新材料股份有限公司
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