WO2021217932A1 - Procédé et appareil de mesure du coefficient de conductivité thermique de cellules de batterie au lithium-ion - Google Patents

Procédé et appareil de mesure du coefficient de conductivité thermique de cellules de batterie au lithium-ion Download PDF

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Publication number
WO2021217932A1
WO2021217932A1 PCT/CN2020/105685 CN2020105685W WO2021217932A1 WO 2021217932 A1 WO2021217932 A1 WO 2021217932A1 CN 2020105685 W CN2020105685 W CN 2020105685W WO 2021217932 A1 WO2021217932 A1 WO 2021217932A1
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WIPO (PCT)
Prior art keywords
tested
battery
thermal conductivity
battery core
battery cells
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PCT/CN2020/105685
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English (en)
Chinese (zh)
Inventor
刘施阳
云凤玲
栗敬敬
方彦彦
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国联汽车动力电池研究院有限责任公司
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Publication of WO2021217932A1 publication Critical patent/WO2021217932A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • 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
    • H01M10/65—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
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • 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

Definitions

  • the method calculates the thermal conductivity of the battery core to be tested by the following formula:
  • ⁇ is the thermal conductivity of the battery core to be tested
  • Q is the power of the heating plate
  • L is the thickness of the battery core to be tested
  • A is the plane cross-sectional area of the battery core to be tested
  • ⁇ T is the temperature difference between inside and outside.
  • the method further includes:
  • the planar cross-sectional area of the heating sheet is greater than 80% of the planar cross-sectional area of the battery core to be tested.
  • the method further includes:
  • the stable temperature gradient state includes:
  • the method further includes:
  • the measurement module is configured to select two battery cores to be tested and measure the properties of the battery cores to be tested;
  • a setting module configured to place the two battery cores to be tested between the cold plates, set the temperature of the cold plate, and stand the battery cores to be tested until the temperature is constant;
  • the embodiment of the present application provides a non-transitory computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the steps of the method for measuring the thermal conductivity of a lithium ion battery cell are realized.
  • FIG. 1 is a flowchart of a method for measuring thermal conductivity of a lithium ion battery cell in an embodiment of the application
  • FIG. 2 is a structural diagram of a device for measuring thermal conductivity of lithium ion battery cells in an embodiment of the application
  • FIG. 3 is a schematic diagram of the structure of an electronic device in an embodiment of the application.
  • FIG. 1 is a schematic flowchart of a method for measuring the thermal conductivity of a lithium-ion battery cell provided by the first embodiment of the application.
  • an embodiment of the present application provides a method for measuring the thermal conductivity of a lithium-ion battery cell.
  • Step S101 Select two battery cores to be tested, and measure the properties of the battery cores to be tested.
  • the battery cores can be lithium-ion battery cores with good uniformity.
  • the properties of the battery cores to be tested are measured. The properties can include the length, width, and length of the battery cores. High, area, volume, quality, etc.
  • insulating materials can be coated on the tabs of the battery core to be tested to prevent safety problems when the lithium-ion battery is subsequently heated by the heating plate.
  • Step S102 placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested with the heating sheet, and wrapping the heat conduction protection panel in the corresponding stacking direction, Wrap the insulation protection material in other directions.
  • a heating sheet is placed between the two battery cores to be tested, and the two battery cores to be tested and the heating sheet are stacked to form the battery core to be tested- Heater-the stacked structure of the battery core to be tested, and then wrap the battery core in the stacking direction to form a thermally conductive protective panel to form a thermally conductive protective panel-battery core to be tested-heating plate-battery core to be tested-heat conduction
  • the stacking direction is stacked up and down, the other directions can be 4 directions, front, back, left, and right. .
  • two battery cores to be tested are placed between the cold plates to form a structure of cold plate-thermally conductive protective panel-battery core to be tested-heating plate-battery core to be tested-thermally conductive protective panel-cold plate , And then set the cold plate temperature. After setting the cold plate temperature, let the battery core to be tested stand still to make the temperature of the above-mentioned structure constant, that is, the temperature of each component of the above-mentioned structure is consistent.
  • Step S104 Adjust the power of the heating plate several times, and after each adjustment, leave the battery core to be tested until the battery core to be tested enters a stable temperature gradient state, and record several sets of the stable temperature gradients The temperature of the inner and outer sides of the battery core to be tested in the state.
  • the power of the heating plate is adjusted several times, and after the power of the heating plate is adjusted each time, in the cold plate-the heat conduction protection panel-the battery core to be tested-the heating plate-
  • the heat can be transferred from the heating sheet to the cold plate through the battery core to be tested vertically, and it is allowed to stand until the battery core to be tested enters a stable temperature gradient state.
  • Step S105 Perform data fitting based on the attributes, the inner and outer temperatures of the battery cores to be tested, and the heater power corresponding to the inner and outer temperatures, to calculate the thermal conductivity of the battery cores to be tested.
  • the thermal conductivity of the battery to be tested is calculated.
  • the result can be linear fitting method based on least square method.
  • the value of R 2 should be greater than 0.98.
  • the embodiment of the application provides a method for measuring the thermal conductivity of lithium-ion battery cells, by wrapping the thermally conductive protective panel in the stacking direction corresponding to the stacking of the battery core to be tested and the heating sheet, and wrapping the thermally insulating protective material in other directions , To prevent the heat diffusion of the heating plate, and calculate the thermal conductivity of the battery core to be tested by data fitting through the measured properties, the inner and outer temperatures of the battery cores under test, and the heating plate power corresponding to the inner and outer temperatures , That is, the calculation method of thermal conductivity also has the characteristics of repeatability test.
  • the attribute includes:
  • the properties of the battery core to be tested include the thickness of the battery core to be tested, the plane cross-sectional area of the battery core to be tested, and the thickness of the battery core to be tested and the thickness of the battery core to be tested Data fitting is performed on the plane cross-sectional area, the inner and outer temperature values of several groups of battery cores to be tested and the heating plate power corresponding to the inner and outer temperature values, and the thermal conductivity of the battery cores to be tested is calculated.
  • ⁇ is the thermal conductivity of the battery core to be tested
  • Q is the power of the heating plate
  • L is the thickness of the battery core to be tested
  • A is the plane cross-sectional area of the battery core to be tested
  • ⁇ T is the temperature difference between inside and outside.
  • the thermal conductivity of the battery core to be tested is calculated by fitting the above formula.
  • the calculation method is repeatable and the calculation result has high accuracy.
  • the method for measuring the thermal conductivity of a lithium-ion battery cell further includes:
  • the planar cross-sectional area of the heating sheet is greater than 80% of the planar cross-sectional area of the battery core to be tested.
  • the planar cross-sectional area of the heating plate is greater than 80% of the planar cross-sectional area of the battery core to be tested, because when the plane of the heating plate is The cross-sectional area is set large enough to ensure that during the heat conduction process of the heating plate, the heat will not spread in the non-stacking direction of the electric test core to be tested, and further prevent the influence of heat diffusion in other directions, thereby improving The accuracy of the measurement results is improved.
  • Fig. 2 is a device for measuring the thermal conductivity of lithium ion battery cells provided by an embodiment of the application, including: a measurement module 201, a placement module 202, a setting module 203, an adjustment module 204, and a data fitting module 205, in which:
  • the measurement module 201 is configured to select two battery cores to be tested and measure the properties of the battery cores to be tested.
  • the placing module 202 is configured to place a heating sheet between the two battery cores to be tested, and to stack the two battery cores to be tested with the heating sheet, and wrap the heat conduction protection panel in the corresponding stacking direction, and in other directions It is wrapped with heat-insulating protective material.
  • the setting module 203 is configured to place two battery cores to be tested between the cold plates, set the temperature of the cold plate, and stand the battery cores to be tested until the temperature is constant.
  • the adjustment module 204 is configured to adjust the power of the heating plate several times, and after each adjustment, the battery core to be tested is allowed to stand until the battery core to be tested enters a stable temperature gradient state, and several groups of the battery to be tested in the stable temperature gradient state are recorded The temperature of the inside and outside of the core.
  • the apparatus may further include:
  • the calculation module is configured to calculate the thermal conductivity of the battery core under test by the following formula:
  • ⁇ is the thermal conductivity of the battery core to be tested
  • Q is the power of the heating plate
  • L is the thickness of the battery core to be tested
  • A is the plane cross-sectional area of the battery core to be tested
  • ⁇ T is the temperature difference between the inner and outer sides.
  • the apparatus may further include:
  • the plane cross-sectional area determination module is configured to determine that the plane cross-sectional area of the heating sheet is greater than 80% of the plane cross-sectional area of the battery core to be tested.
  • each module in the above device for measuring the thermal conductivity of a lithium ion battery cell can be implemented in whole or in part by software, hardware, and a combination thereof.
  • the above-mentioned modules may be embedded in the form of hardware or independent of the processor in the computer equipment, or may be stored in the memory of the computer equipment in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.
  • FIG. 3 illustrates a schematic diagram of the physical structure of an electronic device.
  • the electronic device may include: a processor 301, a memory 302, a communication interface 303, and a communication bus 304, Among them, the processor 301, the memory 302, and the communication interface 303 communicate with each other through the communication bus 304.
  • the processor 301 can call the logic instructions in the memory 302 to execute the following method: select two battery cores to be tested, and measure the properties of the battery cores to be tested; place between the two battery cores to be tested Heating sheet, and stacking two of the battery cores to be tested with the heating sheet, wrapping the thermally conductive protective panel in the corresponding stacking direction, and wrapping the thermally insulating protective material in other directions;
  • the battery core is placed between the cold plates, the temperature of the cold plate is set, and the battery core to be tested is left to stand until the temperature is constant; the power of the heating plate is adjusted several times, and the heating plate is allowed to stand after each adjustment.
  • the aforementioned logic instructions in the memory 302 can be implemented in the form of computer executable instructions and when sold or used as an independent product, they can be stored in a computer readable storage medium. Therefore, an embodiment of this application provides a form of a computer software product.
  • the computer software product is stored in a storage medium and includes a number of instructions to enable a computer device (for example, a personal computer, a server, or Network equipment, etc.) execute all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .
  • the embodiments of the present application also provide a non-transitory computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the computer program is implemented to perform the transmission methods provided in the foregoing embodiments, for example, including : Select two battery cores to be tested and measure the properties of the battery cores to be tested; place a heater between the two battery cores to be tested, The heating sheets are stacked, and the heat-conducting protective panel is wrapped in the corresponding stacking direction, and the heat-insulating protective material is wrapped in other directions; the two battery cores to be tested are placed between the cold plates, and the cold plate temperature is set, And let the battery core to be tested until the temperature is constant; adjust the power of the heating plate several times, and after each adjustment, leave the battery core to be tested until the battery core to be tested enters a stable temperature Gradient state, recording the inner and outer temperatures of the battery core under test in several groups of the stable temperature gradient state; through the attribute, the inner and outer temperatures of the
  • the device embodiments described above are merely illustrative.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One location, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.
  • each implementation manner can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware.
  • the above technical solution essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic A disc, an optical disc, etc., include several instructions to make a computer device (for example, a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiment.

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Abstract

L'invention concerne un procédé et un appareil de mesure du coefficient de conductivité thermique de cellules de batterie au lithium-ion. Le procédé consiste : à sélectionner deux cellules de batterie à mesurer, et à mesurer les propriétés desdites cellules de batterie ; à mettre en place une feuille chauffante entre lesdites cellules de batterie, à empiler lesdites cellules de batterie et la feuille chauffante, à envelopper lesdites cellules de batterie avec des panneaux de protection à conduction thermique dans la direction d'empilement correspondante, et à envelopper ces derniers avec des matériaux protecteurs d'isolation thermique dans d'autres directions ; à placer lesdites deux cellules de batterie entre des plaques froides, à régler la température des plaques froides, et à laisser reposer lesdites cellules de batterie jusqu'à ce que la température soit constante ; à réguler la puissance de la feuille chauffante plusieurs fois, et à laisser reposer lesdites cellules de batterie après chaque régulation jusqu'à ce que lesdites cellules de batterie entrent dans un état de gradient de température stable, et à enregistrer les températures intérieure et extérieure desdites cellules de batterie ; et à réaliser un ajustement de données en fonction des propriétés, de plusieurs groupes des températures intérieure et extérieure desdites cellules de batterie et de la puissance de feuille chauffante correspondante, de manière à calculer le coefficient de conductivité thermique desdites cellules de batterie. Grâce au procédé, la diffusion thermique d'une feuille chauffante peut être empêchée, la précision d'un résultat de mesure est améliorée et un procédé de mesure répétée d'un coefficient de conductivité thermique est également fourni.
PCT/CN2020/105685 2020-04-30 2020-07-30 Procédé et appareil de mesure du coefficient de conductivité thermique de cellules de batterie au lithium-ion WO2021217932A1 (fr)

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