CN115433530A - Bonded flexible battery cooling fin, preparation method thereof and battery module - Google Patents

Bonded flexible battery cooling fin, preparation method thereof and battery module Download PDF

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Publication number
CN115433530A
CN115433530A CN202211085633.8A CN202211085633A CN115433530A CN 115433530 A CN115433530 A CN 115433530A CN 202211085633 A CN202211085633 A CN 202211085633A CN 115433530 A CN115433530 A CN 115433530A
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China
Prior art keywords
battery
flexible battery
radiating fin
bonded
composite material
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Pending
Application number
CN202211085633.8A
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Chinese (zh)
Inventor
崔武
黄保进
丁丽英
殷旭
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Guangdong Cavtop New Energy Technology Co ltd
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Guangdong Cavtop New Energy Technology Co ltd
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Priority to CN202211085633.8A priority Critical patent/CN115433530A/en
Publication of CN115433530A publication Critical patent/CN115433530A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
    • C09J129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J191/00—Adhesives based on oils, fats or waxes; Adhesives based on derivatives thereof
    • C09J191/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2429/00—Presence of polyvinyl alcohol
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2491/00—Presence of oils, fats or waxes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a bonded flexible battery radiating fin, a preparation method thereof and a battery module, wherein the preparation method of the bonded flexible battery radiating fin comprises the following steps: 1) Mixing and stirring the molten paraffin and the expanded graphite uniformly under an oil bath at 60 to 80 ℃ to obtain a binary composite material; 2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol solution with the mass content of 10-40%, and infiltrating the polyvinyl alcohol solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material; 3) And (3) introducing the mixed material into a mould for hot pressing and dewatering to enable the material to be bonded and formed, and demoulding to obtain the bonded flexible battery radiating fin. Compared with the prior art, the radiating fin prepared by the invention has excellent shape adaptability and viscosity, can be applied to battery thermal management in various scenes, is tightly adhered to the surface of a battery, has small contact thermal resistance and high heat conduction efficiency, and cannot fall off after being used for a long time.

Description

Bonded flexible battery cooling fin, preparation method thereof and battery module
Technical Field
The invention belongs to the technical field of battery thermal management, and particularly relates to a bonded flexible battery radiating fin, a preparation method thereof and a battery module.
Background
In the current research on battery thermal management materials, a macromolecular polymer such as a thermoplastic elastomer and rubber with excellent mechanical properties is used as a matrix to encapsulate a micromolecular phase change material, and a high-thermal-conductivity filler is added to construct an internal thermal-conductivity passage so as to guide the improvement of the thermal conductivity of the composite material.
However, in use, it has been found that the following disadvantages exist with current battery thermal management materials:
1) At present, most of battery thermal management materials are not sticky, and an air gap exists after the battery thermal management materials are attached to the surface of a battery, so that the contact thermal resistance is large, and the heat conduction efficiency is low.
2) The inherent thermal conductivity of the phase-change material and most of polymer matrixes is low, the construction of a heat transfer path of the heat-conducting filler in the phase-change material and most of polymer matrixes is hindered, the prepared composite material also often has the property of low thermal conductivity, and the addition of excessive heat-conducting filler can cause the problems of reduction of the mechanical performance of the material, incapability of forming and the like.
In view of the above, it is necessary to provide a novel battery heat dissipation material and a method for preparing the same.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the adhesive flexible battery radiating fin and the preparation method thereof are provided to solve the problems of insufficient viscosity, poor adhesion with the battery surface, large contact thermal resistance and low heat conduction efficiency of the existing battery radiating fin.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a bonded flexible battery radiating fin comprises the following steps:
1) Mixing and stirring the molten paraffin and the expanded graphite uniformly under an oil bath at 60 to 80 ℃ to obtain a binary composite material;
2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol solution with the mass content of 10-40%, and infiltrating the polyvinyl alcohol solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material;
3) And (3) introducing the mixed material into a mold, carrying out hot pressing for removing water to enable the material to be bonded and molded, and demolding to obtain the bonded flexible battery radiating fin.
Preferably, in the step 1), the mass ratio of the molten paraffin to the expanded graphite is 1:1 to 1:5.
preferably, in the step 3), the temperature for hot pressing the mixed material in a mold is 100 to 120 ℃.
Preferably, in the step 3), the paraffin wax and the polyvinyl alcohol are filled in the pores of the expanded graphite network. This gives the material a higher thermal conductivity.
In addition, the invention also provides a bonded flexible battery radiating fin which is prepared by the preparation method of any one section of bonded flexible battery radiating fin.
In addition, the invention also provides a battery module which comprises a battery pack and the radiating fin attached to the battery pack, wherein the radiating fin is the bonded flexible battery radiating fin.
Preferably, the battery pack includes a plurality of battery cell monomers, and the heat sink is attached to the surfaces of the battery cell monomers and is disposed at intervals. The parcel is covered through pasting every electric core monomer, can effectively increase the whole heat radiating area of battery module, improves the radiating effect of battery module.
Compared with the prior art, the invention at least has the following beneficial effects:
1) The radiating fin prepared by the invention has excellent shape adaptability and viscosity, can be applied to battery thermal management in various scenes, is tightly adhered to the surface of a battery, has small contact thermal resistance and high heat conduction efficiency, and cannot fall off after being used for a long time.
2) The prepared radiating fin uses the expanded graphite as a matrix, the paraffin as a phase-change material and the polyvinyl alcohol as a multi-element composite flexible heat-conducting phase-change material of the flexibilizer and the tackifier, reserves a relatively complete expanded graphite heat-conducting network, and encapsulates the phase-change material and the flexible polymer among pores of the heat-conducting network.
3) The preparation process is simple, convenient, efficient, green and environment-friendly, and has good large-scale application value.
Drawings
FIG. 1 is a schematic diagram illustrating the manufacturing principle of the heat sink of the present invention.
Fig. 2 is a schematic view illustrating a heat sink according to the present invention applied to a battery module.
Fig. 3 is a diagram illustrating a temperature rise test result of the battery module according to the present invention.
Fig. 4 is a diagram illustrating a temperature difference test result of the battery module according to the present invention.
In the figure: 1-a cell monomer; 2-a heat sink.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and drawings of the specification, but the embodiments of the present invention are not limited thereto.
Example 1
Heat sink and its preparation
As shown in fig. 1, the method for manufacturing a bonded flexible battery heat sink in this embodiment includes the following steps:
1) Under oil bath at 60 ℃, mixing the components in a mass ratio of 1:1, uniformly mixing and stirring the molten paraffin (OP 44) and the expanded graphite to obtain a binary composite material;
2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol solution with the mass content of 10%, and infiltrating the polyvinyl alcohol solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material;
3) And (3) introducing the mixed material into a mould, carrying out hot pressing at 100 ℃ to remove water so as to bond and form the material, and demoulding to obtain the bonded flexible battery radiating fin, wherein the paraffin and the polyvinyl alcohol are filled in pores of the expanded graphite heat-conducting network.
Battery module
As shown in fig. 2, the battery module of this embodiment includes a battery pack and a heat sink attached to the battery pack, where the heat sink is the above-mentioned adhesive flexible battery heat sink 2, the battery pack includes a plurality of battery cell monomers 1, and the heat sink 2 is attached to the surface of the battery cell monomers 1 and is disposed at intervals between the battery cell monomers 1. Wherein, electric core monomer 1 includes casing and encapsulates naked electric core and electrolyte in the casing, and naked electric core includes positive pole, negative pole and barrier film, and wherein electric core monomer 1 prefers to adopt 18650 electric core monomers, and electric core monomer's preparation technology is the same with conventional preparation technology, and here is no longer repeated.
Example 2
Different from embodiment 1, the method for manufacturing a bonded flexible battery heat sink in this embodiment includes the following steps:
1) Under the condition of oil bath at the temperature of 80 ℃, mixing the components in a mass ratio of 1:5, uniformly mixing and stirring the molten paraffin (OP 44) and the expanded graphite to obtain a binary composite material;
2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol solution with the mass content of 40%, and infiltrating the polyvinyl alcohol solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material;
3) And (3) introducing the mixed material into a mould, carrying out hot pressing at 120 ℃ to remove water so as to bond and form the material, and demoulding to obtain the bonded flexible battery radiating fin, wherein the paraffin and the polyvinyl alcohol are filled in pores of the expanded graphite heat-conducting network.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
Different from embodiment 1, the method for manufacturing a bonded flexible battery heat sink in this embodiment includes the following steps:
1) Under oil bath at 70 ℃, mixing the components in a mass ratio of 1:3, uniformly mixing and stirring the molten paraffin (OP 44) and the expanded graphite to obtain a binary composite material;
2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol (PVA) solution with the mass content of 25%, and infiltrating the PVA solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material;
3) And (3) introducing the mixed material into a mould, carrying out hot pressing at 110 ℃ to remove water so as to bond and form the material, and demoulding to obtain the bonded flexible battery radiating fin, wherein the paraffin and the polyvinyl alcohol are filled in pores of the expanded graphite heat-conducting network.
The rest is the same as embodiment 1, and the description is omitted here.
The heat dissipation fin and the battery module prepared in the embodiment 1 are subjected to a heat management performance test, the temperature rise and the temperature difference of the battery module in a 3C high-rate discharge state are tested, and the heat management performance of the heat dissipation fin is evaluated, wherein the test results are shown in the attached drawings 3-4.
According to the test results, the following test results are obtained: under the high 3C discharge rate, the temperature of the battery module does not exceed 45 ℃, and the temperature difference does not exceed 2 ℃, so that the heat dissipation sheet prepared by the method has excellent heat management performance.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art to which the invention pertains based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions or alterations based on the present invention will fall within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (7)

1. A preparation method of a bonded flexible battery radiating fin is characterized by comprising the following steps:
1) Mixing and stirring the molten paraffin and the expanded graphite uniformly under an oil bath at 60 to 80 ℃ to obtain a binary composite material;
2) Cooling the binary composite material to room temperature, adding a polyvinyl alcohol solution with the mass content of 10-40%, and infiltrating the polyvinyl alcohol solution into the binary composite material to be uniformly mixed and stirred to obtain a mixed material;
3) And (3) introducing the mixed material into a mold, carrying out hot pressing for removing water to enable the material to be bonded and molded, and demolding to obtain the bonded flexible battery radiating fin.
2. The method for preparing a pasted flexible battery heat sink according to claim 1, wherein: in the step 1), the mass ratio of the molten paraffin to the expanded graphite is 1:1 to 1:5.
3. the method for preparing a pasted flexible battery heat sink according to claim 1, wherein: in the step 3), the mixed material is introduced into a die and hot-pressed at the temperature of 100-120 ℃.
4. The method for preparing a pasted flexible battery heat sink according to claim 1, wherein: in the step 3), the paraffin and the polyvinyl alcohol are filled in the pores of the expanded graphite network.
5. The utility model provides a paste flexible battery fin which characterized in that: the preparation method of the paste type flexible battery cooling fin according to any one of claims 1 to 4.
6. A battery module, its characterized in that: the bonded flexible battery heat sink of claim 5, comprising a battery pack and a heat sink attached to the battery pack.
7. The battery module according to claim 6, wherein: the battery pack comprises a plurality of battery cell monomers, and the radiating fins are attached to the surfaces of the battery cell monomers and are arranged at intervals.
CN202211085633.8A 2022-09-06 2022-09-06 Bonded flexible battery cooling fin, preparation method thereof and battery module Pending CN115433530A (en)

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108048045A (en) * 2017-11-28 2018-05-18 大连理工大学 A kind of enhanced thermal conduction organic composite shaping phase-change material and preparation method thereof
CN113136172A (en) * 2021-03-30 2021-07-20 中国地质大学（武汉） Light storage and heat storage type composite phase change material for energy storage and preparation method thereof
CN113388237A (en) * 2021-06-11 2021-09-14 广东工业大学 Flexible composite phase change material, preparation method thereof and battery module
CN114716976A (en) * 2020-12-22 2022-07-08 佛山市顺德区美的电热电器制造有限公司 Composite phase change material, container assembly and preparation method of composite phase change material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108048045A (en) * 2017-11-28 2018-05-18 大连理工大学 A kind of enhanced thermal conduction organic composite shaping phase-change material and preparation method thereof
CN114716976A (en) * 2020-12-22 2022-07-08 佛山市顺德区美的电热电器制造有限公司 Composite phase change material, container assembly and preparation method of composite phase change material
CN113136172A (en) * 2021-03-30 2021-07-20 中国地质大学（武汉） Light storage and heat storage type composite phase change material for energy storage and preparation method thereof
CN113388237A (en) * 2021-06-11 2021-09-14 广东工业大学 Flexible composite phase change material, preparation method thereof and battery module

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Application publication date: 20221206