CN111916873A - Battery module heat conduction structure and battery module - Google Patents

Battery module heat conduction structure and battery module Download PDF

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Publication number
CN111916873A
CN111916873A CN202010934805.9A CN202010934805A CN111916873A CN 111916873 A CN111916873 A CN 111916873A CN 202010934805 A CN202010934805 A CN 202010934805A CN 111916873 A CN111916873 A CN 111916873A
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CN
China
Prior art keywords
heat
battery module
heat conduction
battery
conducting
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Pending
Application number
CN202010934805.9A
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Chinese (zh)
Inventor
盛赟
卞铁铮
冯志强
戴忠梁
张臻
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Trina Energy Storage Solutions Jiangsu Co Ltd
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Trina Solar Co Ltd
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Filing date
Publication date
Application filed by Trina Solar Co Ltd filed Critical Trina Solar Co Ltd
Priority to CN202010934805.9A priority Critical patent/CN111916873A/en
Publication of CN111916873A publication Critical patent/CN111916873A/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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • 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
    • H01M10/625—Vehicles
    • 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
    • H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
    • 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
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • 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
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • 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
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention belongs to the technical field of battery energy storage, and particularly relates to a battery module heat conduction structure and a battery module. The invention ensures that the working temperature of the battery in the battery module is more balanced, is beneficial to improving the charging and discharging efficiency of the battery module and is beneficial to prolonging the service life.

Description

Battery module heat conduction structure and battery module
Technical Field
The invention belongs to the technical field of battery energy storage, and relates to a heat conduction structure of a battery module and the battery module.
Background
The lithium ion battery has the advantages of high energy density, high charge-discharge conversion efficiency, long service life and the like, and is widely applied to the fields of electric automobiles, electric energy storage, communication base stations, backup power supplies and the like. The rated voltage of the single battery is low (for example, the rated voltage of the lithium iron phosphate battery is 3.2V, and the rated voltage of the ternary lithium battery is 3.7V), and the capacity is small (several to several hundred Ah). In different applications, the single lithium batteries need to be grouped in a series connection, a parallel connection or a hybrid interconnection mode, so as to achieve sufficient direct-current side voltage and system capacity.
Temperature is an important factor affecting the performance and life of lithium ion batteries and battery modules. The battery capacity, efficiency and charging and discharging characteristics at different temperatures are different, and when the temperature inconsistency of each single battery in the battery module is large, the overall performance is influenced; and degradation of the life is accelerated by decomposition and side reactions of the battery active material at over-and low temperatures. Therefore, in order to realize the advantages of lithium ion batteries in practical systems, it is necessary to design a good battery heat conduction structure and perform effective heat management.
Both the structural and heat sources cause the battery module to exhibit complicated thermal behavior. The battery module is of a composite structure and comprises a battery body, a battery plastic packaging film, a bus bar, a positioning piece, a fastening piece, an insulating piece, a heat conducting piece and other parts, and the parts with different materials, sizes and shapes have different heat conducting and heat conducting characteristics; under the thermal condition and the electrical condition of different application scenes, the heat generation of the battery is different, and the temperature is different. Currently, a heat conductive structure and technology generally used in a battery module is to provide a heat conductive sheet between batteries to conduct heat of the batteries to adjacent batteries or a heat dissipation member. The heat conducting fins/plates generally have the same heat conducting coefficient, the uniform heat conducting design is not in line with the complex anisotropic structure of the battery module, the temperature equalization and control requirements under various use working conditions cannot be met, the middle temperature of the module is higher, and the temperatures at the two ends and the edges of the module are lower. The inconsistent battery temperature can lead to inconsistent battery state, reduce the charge-discharge efficiency and reduce the service life.
Disclosure of Invention
The present invention is directed to a battery module heat conduction structure.
Another object of the present invention is to provide a battery module.
In order to achieve the purpose, the invention adopts the following technical scheme:
a battery module heat conduction structure comprises a plurality of batteries and heat conducting fins which are arranged alternately, wherein the heat conducting fins at least have more than two heat conduction coefficients.
Furthermore, at least two heat conducting sheets with different positions have different heat conductivity coefficients.
Furthermore, the heat conductivity coefficient of the heat conducting fins positioned in the middle is larger than that of the heat conducting fins positioned at the edges.
Furthermore, the heat conductivity coefficient of the plurality of heat conducting fins is gradually reduced from the middle to two sides.
Further, the heat conductivity coefficient of the heat conducting sheet is 0.1-500W/(m.K).
Furthermore, the heat conducting fin is made of one or more of aluminum, aluminum alloy, graphite, a carbon nanotube plate, carbon nanotube paper, plastic, hydrogel, silica gel, rubber and pouring sealant.
Further, the heat dissipation device also comprises a heat dissipation piece, and the heat dissipation piece is connected with the heat conduction sheet.
Furthermore, the heat dissipation part is an air cooling heat dissipation part or a liquid cooling heat dissipation part.
A battery module with the above battery module heat conduction structure is provided.
Compared with the prior art, the invention has the advantages that:
the invention provides a battery module heat conduction structure and a battery module. The design of this heat conduction structure is synthesized and is considered battery size itself and actual conditions such as each direction heat conductivity, other part structures and heat conductivities, the temperature and the heat production operating mode of use, optimizes the conducting strip/board that sets up different coefficient of heat conductivity and material for the operating temperature of battery is more balanced in the battery module, is favorable to improving the charge-discharge efficiency who improves the battery module, is favorable to increase of service life. The heat conduction structure is widely applicable and can be applied to various lithium batteries and battery modules in grouping modes and heat management modes. The battery module with the heat conduction structure is expected to improve the endurance mileage and the heat management safety of the electric automobile, and improve the system efficiency and the service life of the electric energy storage system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view of a heat conducting structure of a battery according to the present invention.
Fig. 2 is another schematic view of the heat conducting structure of the battery of the present invention.
In the figure: battery 1, heat conduction piece 2, heat sink 3.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
As shown in fig. 1, a heat conducting structure of a battery module comprises a plurality of batteries 1 and heat conducting fins 2 which are alternately arranged, the heat conducting fins are in good contact with the batteries to form alternate superposition, and the plurality of heat conducting fins 2 at least have more than two heat conducting coefficients. That is, at least two heat conductive sheets 2 have different heat conductivity coefficients, and the positions of the two heat conductive sheets 2 having different heat conductivity coefficients in the structure are different. The battery 1 may be a lithium iron phosphate battery.
The heat conductivity coefficient of the heat conducting fin 2 is 0.1-500W/(m.K), and the material of the heat conducting fin 2 is one or more of aluminum, aluminum alloy, graphite, carbon nanotube sheet paper, plastic, hydrogel, silica gel, rubber and pouring sealant.
In consideration of the fact that heat is less easily dissipated in the battery module the more in the middle, in the present embodiment, the heat conductivity of the heat-conducting sheet 2 located in the middle is greater than the heat conductivity of the heat-conducting sheet 2 located at the edge. In the preferred scheme, the heat conductivity coefficient of the plurality of heat conducting fins 2 is gradually reduced from the middle to two sides.
Specifically, the present embodiment includes a heat conductive sheet 2 having a thermal conductivity of 3. As shown in fig. 2, the central thermally conductive sheet 2a has a thermal conductivity of 6W/(m · K), the intermediate thermally conductive sheet 2b has a thermal conductivity of 5W/(m · K), and the edge thermally conductive sheet 2c has a thermal conductivity of 3W/(m · K).
The heat sink 3 is connected to the heat conductive sheet 2 to make good contact. The heat sink 3 is an air-cooled heat sink or a liquid-cooled heat sink 3.
Preferably, the heat conducting sheet 2 is made of an aluminum sheet, the two surfaces of the aluminum sheet are covered with a heat conducting silica gel material, and aluminum in the heat conducting sheet is contacted with the heat radiating piece 3 to conduct heat to the battery module of the heat conducting structure of the heat radiating piece battery module.
The invention provides a battery module heat conduction structure and a battery module. The heat conducting fins/plates with different heat conducting performances are optimally arranged aiming at the environmental temperature and the battery heat production conditions in different application scenes and use working conditions, the heat transfer and heat exchange processes of the battery module are regulated, the temperature difference of each battery is reduced, the performance of the battery module is improved, and the service life of the battery module is prolonged. The heat conduction structure is widely applicable, can be applied to various lithium batteries, battery modules in grouping modes and heat management modes, and meets the requirements of various battery application scenes.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit of the invention.

Claims (9)

1. The utility model provides a battery module heat conduction structure, includes battery (1) and conducting strip (2) of a plurality of alternate settings, its characterized in that, a plurality of conducting strips (2) have more than two kinds of coefficient of heat conductivity at least.
2. The heat conduction structure of a battery module according to claim 1, wherein at least two thermally conductive sheets (2) having different positions have different thermal conductivities.
3. The heat conduction structure of a battery module according to claim 1, wherein the heat conduction coefficient of the heat conduction sheet (2) located at the center is greater than the heat conduction coefficient of the heat conduction sheet (2) located at the edge.
4. The heat conduction structure of a battery module according to claim 3, wherein the heat conductivity of the plurality of heat conduction sheets (2) is gradually decreased from the middle to both sides.
5. The heat conductive structure of a battery module according to claim 1, wherein the heat conductive sheet (2) has a heat conductivity of 0.1-500W/(m-K).
6. The battery module heat-conducting structure according to claim 1, wherein the heat-conducting sheet (2) is made of one or more of aluminum, aluminum alloy, graphite, carbon nanotube sheet, plastic, hydrogel, silicone, rubber, and potting adhesive.
7. The heat conducting structure of a battery module as claimed in claim 1, further comprising a heat dissipating member (3), wherein the heat dissipating member (3) is connected to the heat conducting sheet (2).
8. The heat conducting structure of battery module as claimed in claim 7, wherein the heat sink (3) is an air-cooled heat sink or a liquid-cooled heat sink (3).
9. A battery module having the heat transfer structure of the battery module according to any one of claims 1 to 8.
CN202010934805.9A 2020-09-08 2020-09-08 Battery module heat conduction structure and battery module Pending CN111916873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010934805.9A CN111916873A (en) 2020-09-08 2020-09-08 Battery module heat conduction structure and battery module

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Application Number Priority Date Filing Date Title
CN202010934805.9A CN111916873A (en) 2020-09-08 2020-09-08 Battery module heat conduction structure and battery module

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CN111916873A true CN111916873A (en) 2020-11-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113659235A (en) * 2021-08-09 2021-11-16 中国电力科学研究院有限公司 Lithium ion battery liquid cooling system and energy storage system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113659235A (en) * 2021-08-09 2021-11-16 中国电力科学研究院有限公司 Lithium ion battery liquid cooling system and energy storage system

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Effective date of registration: 20210922

Address after: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu

Applicant after: TRINA ENERGY STORAGE SOLUTIONS (JIANGSU) Co.,Ltd.

Address before: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu

Applicant before: TRINA SOLAR Co.,Ltd.

TA01 Transfer of patent application right