CN115513567A - Integral composite heating sheet and lithium battery pack thereof - Google Patents

Integral composite heating sheet and lithium battery pack thereof Download PDF

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Publication number
CN115513567A
CN115513567A CN202211157377.9A CN202211157377A CN115513567A CN 115513567 A CN115513567 A CN 115513567A CN 202211157377 A CN202211157377 A CN 202211157377A CN 115513567 A CN115513567 A CN 115513567A
Authority
CN
China
Prior art keywords
battery pack
lithium battery
heat
heating wire
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211157377.9A
Other languages
Chinese (zh)
Inventor
陈占胜
韩赛赛
付鑫
翟载腾
陈菡
史奇良
胡小康
周必磊
邹兴
刘培
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Institute of Satellite Engineering
Original Assignee
Shanghai Institute of Satellite Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Institute of Satellite Engineering filed Critical Shanghai Institute of Satellite Engineering
Priority to CN202211157377.9A priority Critical patent/CN115513567A/en
Publication of CN115513567A publication Critical patent/CN115513567A/en
Pending legal-status Critical Current

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    • 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
    • H01M10/615—Heating or keeping warm
    • 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
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • 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
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention provides a whole composite heating sheet and a lithium battery pack thereof in the technical field of aerospace and aviation. Graphite membrane encapsulation is outside at electric heater strip, and polyimide parcel encapsulation electric heater strip and graphite membrane, and the heating plate is provided with the gas release hole on the surface. The electric heating wire circular telegram produces the heat, and the heat passes through on polyimide conducts to the lithium cell group, and the heat is used for compensating the lithium cell group and reduces because of the temperature that the thermal current changes and arouse outside the track, guarantees that the temperature of lithium cell group maintains in suitable interval. According to the invention, the one-time integral sheet is pasted with the lithium battery pack on one side, so that the pasting times of the heating sheet and the indirect line times of the heating sheet can be reduced, the pasting process operation is greatly facilitated, the implementation period is obviously shortened, the misoperation risk is obviously reduced, and the method is suitable for the commercial batch production of satellite constellations.

Description

Integral composite heating sheet and lithium battery pack thereof
Technical Field
The invention relates to the technical field of aerospace and aviation, in particular to an integral composite heating sheet and a lithium battery pack thereof.
Background
The power supply and distribution system of the spacecraft is an important subsystem on the spacecraft, and the basic function of the power supply system is to convert light energy, chemical energy or nuclear energy into electric energy through certain physical change or chemical change, store, adjust and convert the electric energy according to needs and then supply power to each subsystem of the spacecraft. The lithium ion battery is widely applied to a spacecraft power supply system, has high requirements on storage and working temperature, and can influence normal use and accelerate the service life decay of the lithium battery at low temperature.
The method meets the requirement that a satellite constellation completes large-scale deployment in a short time, obviously shortens the satellite development period, simplifies the production flow, improves the product reliability, and has the advantages that the lithium battery heating plate pasting system is a serial flow in the lithium battery development process, but the traditional method is complex in operation, large in repeated workload, easy to make mistakes, and the implementation period reaches more than 20 days. Therefore, in order to meet the requirement of commercial mass production of satellite constellations, shortening the satellite development cycle is urgently needed, and the reduction of the implementation development cycle of the lithium battery electric heating plate and the improvement of the reliability of the heating plate are needed.
In the prior art, each single body of the lithium battery pack heating sheet is provided with one heating sheet, but the repetitive workload of sticking the heating sheet, connecting wires of the heating sheets and the like is large, the operation is complex, the error is easy to occur, and the implementation period is long.
The prior art searches and discovers that the Chinese invention patent publication No. CN107634279B discloses an on-orbit thermal control device for lithium batteries, a polyimide film with the thickness of 100 mu m is arranged between the lithium batteries and a mounting plate, the mounting plate is a carbon fiber honeycomb plate, 2 heat pipes are pre-embedded in the plate, and two groups of lithium batteries are connected in series; the outer side of the mounting plate adopts OSR as a heat dissipation surface, and the inner side is sprayed with high-emissivity thermal control coating black paint except for the lithium battery mounting surface; the multilayer structure is a 10-unit multilayer heat insulation assembly, and each multilayer heat insulation unit is formed by a layer of double-sided aluminum plated polyester film and a layer of nylon net towel at intervals; the heaters are three paths and used for actively controlling the temperature of the lithium battery pack, and the thermistors correspond to the measuring points of the lithium battery pack. The lithium battery monomer heating plate that relates to in this patent just has the problem that needs several times to paste, and the implementation cycle is long, convenient and fast inadequately.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a whole composite heating sheet and a lithium battery pack thereof.
According to the integral composite heating sheet provided by the invention, the heating sheet comprises an electric heating wire, a graphite film, polyimide and an air vent;
the graphite film is packaged outside the electric heating wire, the electric heating wire and the graphite film are packaged and packaged by the polyimide, and air vents are formed in the surface of the heating sheet;
the electric heating wire circular telegram produces the heat, the heat passes through on polyimide conduction to the lithium cell group, the heat is used for compensating the temperature reduction that the lithium cell group arouses because of the thermal current changes outside the track guarantees the temperature of lithium cell group maintains in predetermineeing the interval.
In some embodiments, the heating sheet is adhered to one side surface of the lithium battery pack through silicon rubber at one time, so that the operation is convenient, the implementation period is shortened, and the misoperation risk is reduced.
In some embodiments, the area of the heat patch is the same size as the lateral area of the lithium battery pack.
In some embodiments, the electric heating wire is a constantan foil electric heating wire.
In some embodiments, the graphite film is packaged outside the electric heating wire through hot melt adhesive hot pressing, the heat conductivity coefficient of the graphite film is superior to 1000W/square meter K, and the graphite film is used for enhancing the heat transfer in a face-to-face mode, further improving the temperature uniformity among the monomers and preventing the heating sheet from being burnt due to the fact that the heating wire connected among the monomers is not in direct contact with the surface of the battery monomer and is subjected to idle burning, so that the heating sheet is burnt.
In some embodiments, the polyimide is an organic polymer material having high insulating property, and the electric heating wire is insulated from the lithium battery pack by being encapsulated by the polyimide.
In some embodiments, divide on the heating plate to be equipped with a plurality of battery cell and correspond the region, electric heating wire evenly lays wire in a plurality of in the battery cell corresponds the region, have certain flexibility after the heating plate divides the region, can reduce right the surface of heating plate between battery cell pastes the requirement of installation accuracy on the lithium cell group.
In some embodiments, the air vents are uniformly arranged between corresponding regions of the single batteries, so that internal air bubbles are conveniently discharged in the implementation process, and the reliability of the product is improved.
In some embodiments, no silicon rubber is filled in gaps between corresponding areas of adjacent single batteries, so that the silicon rubber is prevented from being separated from the heating sheet after a thermal cycle test to cause burning of the heating sheet;
and adjacent cross lines are arranged between the corresponding areas of the single batteries, and the cross lines are connected with the adjacent electric heating wires in series, so that the heat flow density of each single battery is the same.
A lithium battery pack is provided, and the integral composite heating sheet is applied.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the one-time integral sheet is pasted with the lithium battery pack on one side, so that the pasting times of the heating sheet and the indirect line times of the heating sheet can be reduced, the operation in the pasting process is greatly facilitated, the implementation period is obviously shortened, the misoperation risk is obviously reduced, and the method is suitable for the commercial batch production of satellite constellations;
2. according to the invention, the graphite film is arranged to enhance the heating sheet to transfer heat, so that the temperature uniformity among the monomers is further improved, the risk of small bubbles in the implementation process is reduced, and the heating sheet is prevented from being burnt out due to heat concentration caused by heating of the resistance wires across the wires among the monomers of the battery pack;
3. the air vent is arranged, so that internal air bubbles in the working process can be conveniently discharged, and air bubbles at the lower part of the heating sheet can be conveniently discharged during the operation of the track;
4. according to the invention, the corresponding regions of the single batteries are arranged in different regions, the heating sheets have certain flexibility after being arranged in different regions, and the requirement on the mounting precision of the heating sheet sticking surfaces among the single batteries of the battery pack can be reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of a one-piece composite heat patch of the present invention;
figure 2 is a schematic cross-sectional view of a one-piece composite heat patch of the present invention.
Reference numerals:
heating sheet 1 polyimide 14
Crossover 15 of single battery corresponding region 11
Air vent 16 of electric heating wire 12
Graphite film 13
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the invention.
Example 1
As shown in fig. 1 and 2, the present invention includes a heating wire 12, a graphite film 13, polyimide 14, and a vent hole 16.
The heating wire 12 is a pure resistor, generates heat after voltage is applied to two ends of the heating wire, heat is transferred to the battery pack through the polyimide 14, the temperature reduction of the lithium battery pack caused by heat flow change outside the rail is compensated, and the temperature of the lithium battery pack is not lower than the lower limit. The heating wires 12 are uniformly distributed in different areas according to the size of the flat surface of the single battery pack, the single battery pack is connected through the heating wires 12, and the heating wires 12 in different areas on the single side of the battery pack are arranged in series, so that the heat flow density applied to each single battery pack is the same. The heating wire 12 is encapsulated by polyimide 14, which is a highly insulating material, at high temperature and high pressure, and is insulated from the battery pack.
Graphite film 13 is by hot melt adhesive hot pressing encapsulation in heater strip 12 outside, and reinforcing heating plate 1 is towards heat transfer, further improves the temperature homogeneity between the group battery monomer, prevents to connect the heater strip 12 between the group battery monomer and not lead to empty fever with the direct contact of group battery monomer surface, leads to heating plate 1 to burn out. The whole heating plate 1 after packaging is provided with the air vents 16 between the corresponding areas 11 of the single batteries, so that internal air bubbles can be discharged in the pasting process and air bubbles at the lower part of the heating plate 1 can be discharged in the track running process, and the reliability of products is improved. The silicon rubber for the whole heating plate 1 after packaging can be stuck to one side of the battery pack at one time, so that the sticking times of the heating plate 1 and the indirect line times of the heating plate are reduced, the operation is greatly convenient, and the implementation period is shortened.
The working principle is as follows:
the heating wires 12 are uniformly distributed according to the corresponding areas 11 of the single batteries, and the heating wires 12 among the single batteries of the battery pack are connected in series. Air vents 16 are provided between the respective cell corresponding regions 11 for internal air bubble discharge during the bonding process and air bubble discharge under the heat chip 1 during the track operation.
The heating wire 12 is a pure resistor, and can generate heat after voltage is applied to two ends of the heating wire, so that the temperature reduction of the lithium battery pack caused by heat flow change outside the rail can be compensated. The polyimide 14 encapsulates the heater wire 12 under high temperature and high pressure in an insulated arrangement with the battery pack. The graphite film 13 has high heat conduction characteristic, so that the heating wire 12 connected between the battery pack monomers is prevented from being in direct contact with the surfaces of the battery pack monomers to cause empty burning, and the reliability of the product is improved.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. The integral composite heating sheet is characterized in that the heating sheet comprises an electric heating wire, a graphite film, polyimide and an air vent;
the graphite film is packaged outside the electric heating wire, the electric heating wire and the graphite film are packaged and packaged by the polyimide, and air vents are formed in the surface of the heating sheet;
the electric heating wire is electrified to generate heat, the heat is conducted to the lithium battery pack through the polyimide, the heat is used for compensating temperature reduction of the lithium battery pack outside the rail due to heat flow change, and the temperature of the lithium battery pack is guaranteed to be maintained in a preset interval.
2. The integrated composite heat patch of claim 1, wherein the heat patch is adhered to one side of the lithium battery pack at a time by silicone rubber.
3. The integrated composite heat patch of claim 1, wherein the heat patch has an area size that is consistent with a side area size of the lithium battery pack.
4. The monolithic composite heat patch of claim 1, wherein the electrical heating wire is a constantan foil electrical heating wire.
5. The integrated composite heat patch according to claim 1, wherein the graphite film is encapsulated outside the electric heating wire by hot melt adhesive hot press.
6. The integrated composite heating plate of claim 1, wherein the electrical heating wire is insulated from the lithium battery pack by being encapsulated by the polyimide.
7. The integrated composite heating plate of claim 1, wherein the heating plate is divided into a plurality of corresponding regions for the single battery cells, and the electric heating wires are uniformly distributed in the plurality of corresponding regions for the single battery cells.
8. The integrated composite heating plate of claim 7, wherein the air holes are uniformly formed between corresponding regions of the plurality of unit cells.
9. The monolithic composite heating plate of claim 7, wherein a crossover is disposed between corresponding regions of adjacent unit cells, and adjacent electric heating wires are connected in series through the crossover.
10. A lithium battery comprising a monolithic composite heating sheet according to any of claims 1 to 9.
CN202211157377.9A 2022-09-22 2022-09-22 Integral composite heating sheet and lithium battery pack thereof Pending CN115513567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211157377.9A CN115513567A (en) 2022-09-22 2022-09-22 Integral composite heating sheet and lithium battery pack thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211157377.9A CN115513567A (en) 2022-09-22 2022-09-22 Integral composite heating sheet and lithium battery pack thereof

Publications (1)

Publication Number Publication Date
CN115513567A true CN115513567A (en) 2022-12-23

Family

ID=84506814

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211157377.9A Pending CN115513567A (en) 2022-09-22 2022-09-22 Integral composite heating sheet and lithium battery pack thereof

Country Status (1)

Country Link
CN (1) CN115513567A (en)

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