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Flame-retardant coating layer used for lithium battery pack and preparation method of flame-retardant coating layer

A technology of flame retardant coating and lithium battery, which is applied in the direction of secondary battery, battery pack parts, battery box/coating, etc., which can solve the problem that the safety of the battery cannot be guaranteed, the flame retardant effect of inorganic insulators is limited, and the battery cannot be used. And other problems, to achieve the effect of ensuring normal operation, improving adhesion, and improving flame retardant effect

Active Publication Date: 2018-03-30
江苏悦达新能源电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion battery packs have the advantages of high energy density, high working voltage, wide applicable temperature range, long cycle life, and no memory effect. They are widely used in electronic equipment, electric vehicles and other fields. The high-level working environment leads to safety problems such as easy fire and explosion, so the effective flame retardancy of battery packs has become a hot spot in battery pack research
[0003] The main measure for the flame retardancy of the battery pack is to cover the surface of the battery pack with a layer of insulators. The insulators currently used are generally alumina, zirconia, silicon nitride, etc., and these insulators can play a certain role in insulating and flame retardant. , but the flame retardant effect of these inorganic insulators is very limited, and cannot cope with the problems of easy fire and explosion in the use of the battery, and cannot guarantee the safety of the battery

Method used

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  • Flame-retardant coating layer used for lithium battery pack and preparation method of flame-retardant coating layer
  • Flame-retardant coating layer used for lithium battery pack and preparation method of flame-retardant coating layer
  • Flame-retardant coating layer used for lithium battery pack and preparation method of flame-retardant coating layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A kind of flame retardant coating for lithium battery pack, this flame retardant coating is coated on the case body of battery pack, comprises intumescent flame retardant coating, adhesive layer and Polytetrafluoroethylene layer; the adhesive layer is an epoxy resin adhesive layer; the thicknesses of the intumescent flame-retardant coating, the adhesive layer and the polytetrafluoroethylene layer are 0.8um, 0.3um and 0.2um respectively;

[0029] The intumescent flame retardant coating comprises the following components:

[0030]

[0031] The preparation method of described modified polyurethane adhesive comprises the steps:

[0032] (11) Add specific proportions of polyglycerol and polytetramethylene ether glycol into the reactor, then add solvent and stir until evenly mixed, add isophorone diisocyanate, so that the molar ratio of NCO / -OH is 0.5 : 1, after adding the catalyst, raise the temperature to 72°C and react for 1.5h; wherein the specific model...

Embodiment 2

[0042] Embodiment 2: A kind of flame-retardant coating for lithium battery pack, this flame-retardant coating is coated on the case body of battery pack, comprises intumescent flame-retardant coating, adhesive layer and Polytetrafluoroethylene layer; the adhesive layer is an epoxy resin adhesive layer; the thicknesses of the intumescent flame-retardant coating, the adhesive layer and the polytetrafluoroethylene layer are 0.4um, 0.2um and 0.1um respectively;

[0043] The intumescent flame retardant coating comprises the following components:

[0044]

[0045] The preparation method of described modified polyurethane adhesive comprises the steps:

[0046] (11) Add specific proportions of polyglycerol and polytetramethylene ether glycol into the reactor, then add solvent and stir until evenly mixed, add isophorone diisocyanate, so that the molar ratio of NCO / -OH is 0.5 ~0.65:1, after adding the catalyst, increase the temperature to 70°C, and react for 1 hour; the specific mod...

Embodiment 3

[0056] Embodiment 3: A kind of flame-retardant coating for lithium battery pack, this flame-retardant coating is coated on the casing of battery pack, comprises intumescent flame-retardant coating, adhesive layer and Polytetrafluoroethylene layer; the adhesive layer is an epoxy resin adhesive layer; the thicknesses of the intumescent flame-retardant coating, the adhesive layer and the polytetrafluoroethylene layer are 0.9um, 0.4um and 0.3um respectively;

[0057] The intumescent flame retardant coating comprises the following components:

[0058]

[0059]

[0060] The preparation method of described modified polyurethane adhesive comprises the steps:

[0061] (11) Add specific proportions of polyglycerol and polytetramethylene ether glycol into the reactor, then add solvent and stir until evenly mixed, add isophorone diisocyanate, so that the molar ratio of NCO / -OH is 0.65 : 1, after adding the catalyst, raise the temperature to 75°C and react for 2 hours; wherein the s...

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PUM

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Abstract

The invention discloses a flame-retardant coating layer used for a lithium battery pack. A battery pack box is coated with the flame-retardant coating layer, and the flame-retardant coating layer comprises an expansion type flame-retardant coating layer, an adhesive layer and a polytetrafluoroethylene layer from inside to outside in sequence; and the expansion type flame-retardant coating layer comprises the following components: modified polyamide 66, melamine cyanurate, molybdenum trioxide, cyclopentadienyl iron, zinc borate and a modified polyurethane adhesive. According to the scheme, thebattery pack box is coated with the flame-retardant coating layer; by virtue of matching of the expansion type flame-retardant coating layer, the adhesive layer and the polytetrafluoroethylene layer,the polytetrafluoroethylene layer is used as the first flame-retardant line of defense to handle a high-temperature environment in the battery; when battery operation is in an abnormal state, the current exceeds standard and the temperature is increased sharply, and after the polytetrafluoroethylene layer is damaged, the expansion type flame-retardant coating layer is used as the second flame-retardant line of defense; and the expansion type flame-retardant coating layer expands at a temperature of 280 DEG C to form a blocking layer, so that generation of combustion or explosion accidents canbe effectively delayed or avoided.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a flame-retardant coating for a lithium battery pack and a preparation method thereof. Background technique [0002] Since the industrial society, the required energy in various fields such as social production and transportation has generally relied on traditional energy sources. However, with the continuous development of traditional energy sources, natural energy sources such as oil are on the verge of depletion. Therefore, human development and utilization of new energy sources become more and more important. Electric vehicles will be produced in response to the potential. As the name implies, an electric vehicle is a vehicle powered by electricity, and the core component is the development of the battery pack. Lithium-ion battery packs have the advantages of high energy density, high working voltage, wide applicable temperature range, long cycle life, and no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/0525H01M50/116H01M50/124
CPCH01M50/116H01M50/1243H01M50/124Y02E60/10
Inventor 沈佳伟祁圣民
Owner 江苏悦达新能源电池有限公司