CN111579581A - Method and device for measuring heat conductivity coefficient of lithium ion battery cell - Google Patents
Method and device for measuring heat conductivity coefficient of lithium ion battery cell Download PDFInfo
- Publication number
- CN111579581A CN111579581A CN202010367286.2A CN202010367286A CN111579581A CN 111579581 A CN111579581 A CN 111579581A CN 202010367286 A CN202010367286 A CN 202010367286A CN 111579581 A CN111579581 A CN 111579581A
- Authority
- CN
- China
- Prior art keywords
- tested
- battery core
- battery
- core body
- measuring
- 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
Links
Images
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the invention provides a method and a device for measuring the heat conductivity coefficient of a lithium ion battery cell, wherein the method comprises the following steps: selecting two battery cores to be tested, and measuring the attributes of the battery cores to be tested; placing heating sheets between the battery cores to be tested and stacking the heating sheets, wrapping the heat-conducting protective panel in the corresponding stacking direction, and wrapping the heat-insulating protective material in other directions; placing two battery cores to be tested between cold plates, setting the temperature of the cold plates, and standing until the temperature is constant; adjusting the power of the heating sheet for a plurality of times, standing after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested; and performing data fitting through the attributes, the temperatures of the inner side and the outer side of the battery cores to be tested and the corresponding power of the heating plates, and calculating the heat conductivity coefficient of the battery core to be tested. The method can prevent the heat diffusion of the heating sheet, improve the accuracy of the measurement result and provide a method for testing the heat conductivity coefficient in a repeatable way.
Description
Technical Field
The invention relates to the field of battery parameter testing, in particular to a method and a device for measuring the heat conductivity coefficient of a lithium ion battery cell.
Background
At present, batteries mainly comprising lithium ion batteries are increasingly applied to various fields due to the advantages of high power density, good consistency and the like, and during the operation of the lithium batteries, the practical conditions include that 1, the heat management and the safety of a power battery are core technologies in the integration of a battery system, and the advantages and the disadvantages of a heat management system can directly influence the dynamic property, the service life and the whole package safety of the battery system; 2. during design of an excellent thermal management system, simulation analysis is not required, the means of software analysis is utilized, the time for designing the thermal management system can be effectively shortened, the design risk is reduced, the probability of problems in later tests is reduced, and the like, and the design efficiency of the thermal management system can be obviously improved through the simulation analysis; 3. accurate physical property input is a precondition for accurate simulation; for temperature field simulation frequently used in the design of a power battery thermal management system, accurate thermophysical property parameter input of a battery core is required; 4. the thermophysical properties include: anisotropic thermal conductivity (or thermal diffusivity); 5. with the continuous updating of the battery cell technology and products, the accuracy of old experience data is lower and lower, the parameter database needs to be updated, and the parameters of the battery cell products of different suppliers are different. It is necessary to measure the thermal conductivity of the lithium ion battery.
For the above problems, some existing technologies can measure the thermal conductivity of the lithium ion battery, for example, the methods such as a hot plate shield method and a thermal conductivity transient method are used for measuring, but the former method is easily affected by thermal diffusion in other two directions, the thermal diffusion further affects the accuracy of the measurement result, and the latter method has high requirements on instruments and equipment, and has poor data repeatability.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for measuring the heat conductivity coefficient of a lithium ion battery cell.
The embodiment of the invention provides a method for measuring the heat conductivity coefficient of a lithium ion battery cell, which comprises the following steps:
selecting two battery cores to be tested, and measuring the attributes of the battery cores to be tested;
placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping a heat-conducting protective panel in the corresponding stacking direction, and wrapping heat-insulating protective materials in other directions;
placing the two battery core bodies to be tested between cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant;
adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies are in the stable temperature gradient state;
and performing data fitting through the attributes, the inner and outer side temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer side temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
In one embodiment, the attributes include:
the thickness of the battery core body to be tested and the plane cross-sectional area of the battery core body to be tested.
In one embodiment, the method calculates the thermal conductivity of the battery core to be tested by the following formula:
wherein λ is the heat conductivity coefficient of the battery core to be tested, Q is the power of the heating sheet, L is the thickness of the battery core to be tested, a is the planar cross-sectional area of the battery core to be tested, and Δ T is the difference between the inside and outside temperatures.
In one embodiment, the method further comprises:
the plane cross-sectional area of the heating sheet is larger than 80% of the plane cross-sectional area of the battery core body to be tested.
In one embodiment, the method further comprises:
the cold plate is a panel containing a circulating liquid cooling medium.
In one embodiment, the stabilizing the temperature gradient state comprises:
and the temperature difference between the upper surface and the lower surface of the battery core body to be measured is a constant value.
In one embodiment, the method further comprises:
the data fitting is a linear fitting mode based on a least square method.
The embodiment of the invention provides a device for measuring the heat conductivity coefficient of a lithium ion battery cell, which comprises:
the measuring module is used for selecting two battery core bodies to be measured and measuring the attribute of the battery core bodies to be measured;
the placing module is used for placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping the heat-conducting protective panel in the corresponding stacking direction, and wrapping the heat-insulating protective material in other directions;
the setting module is used for placing the two battery core bodies to be tested between the cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant;
the adjusting module is used for adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies to be tested enter the stable temperature gradient state;
and the data fitting module is used for performing data fitting through the attributes, the inner and outer temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
The embodiment of the invention provides electronic equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the steps of the method for measuring the heat conductivity coefficient of the electric core of the lithium ion battery are realized when the processor executes the program.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above method for measuring a thermal conductivity of a lithium ion battery cell.
According to the method and the device for measuring the heat conductivity coefficient of the lithium ion battery cell, the heat-conducting protection panel is wrapped in the stacking direction corresponding to the stacking of the battery core body to be measured and the heating plate, and the heat-insulating protection material is wrapped in other directions, so that the heat diffusion of the heating plate is prevented, and the heat conductivity coefficient of the battery core body to be measured is calculated by performing data fitting on the measured attributes, the inner and outer temperatures of a plurality of groups of battery core bodies to be measured and the power of the heating plate corresponding to the inner and outer temperatures, namely the calculation method of the heat conductivity coefficient also has the characteristic of repeatability test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for measuring a thermal conductivity of a lithium ion battery cell according to an embodiment of the present invention;
fig. 2 is a structural diagram of an apparatus for measuring a thermal conductivity of a lithium ion battery cell according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for measuring a thermal conductivity of a lithium ion battery cell according to a first embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides a method for measuring a thermal conductivity of a lithium ion battery cell, including:
step S101, two battery cores to be tested are selected, and the attributes of the battery cores to be tested are measured.
Specifically, two battery cores to be measured for heat conductivity are selected, the battery cores can be lithium ion battery cores with good uniformity, the attributes of the battery cores to be measured are measured, the attributes can include the length, width, height, area, volume, quality and the like of the battery cores, in addition, an insulating material can be coated on the tabs of the battery cores to be measured, and the safety problem of the lithium ion batteries during subsequent heating through the heating sheet is prevented.
And S102, placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping the heat-conducting protective panel in the corresponding stacking direction, and wrapping the heat-insulating protective material in other directions.
Specifically, after two battery cores to be tested are selected, a heating sheet is placed between the two battery cores to be tested, the two battery cores to be tested are stacked with the heating sheet to form a stacked structure of the battery core to be tested, the heating sheet and the battery core to be tested, then the battery core is wrapped by the heat-conducting protective panel in the stacking direction to form a structure of the heat-conducting protective panel, the battery core to be tested, the heating sheet, the battery core to be tested and the heat-conducting protective panel, and heat-insulating protective materials are wrapped in other directions, wherein the other directions are directions other than the stacking direction, for example, the stacking direction is stacked up and down, and the other directions can be front, back, left and right directions 4.
And S103, placing the two battery core bodies to be tested between cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant.
Specifically, two battery cores to be tested are placed between cold plates, so that a structure of a cold plate, a heat conduction protection panel, a battery core to be tested, a heating sheet, a battery core to be tested, a heat conduction protection panel and a cold plate can be formed, then the temperature of the cold plate is set, and after the temperature of the cold plate is set, the battery core to be tested is placed still, so that the temperature of the structure is constant, namely the temperature of each component of the structure is consistent. In addition, the cold plate can be a panel containing a circulating liquid cooling medium, and has certain heat dissipation capacity, so that a subsequent battery core to be tested can conveniently enter a stable temperature gradient state, and the oil bath temperature of the circulating liquid for preventing the battery core from overheating the cold plate is lower than 10 ℃.
And S104, adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of battery core bodies are in the stable temperature gradient state.
Specifically, after the structural temperature of the battery core body to be measured is constant, the power of the heating sheet is adjusted for a plurality of times, after adjusting the power of the heating sheet each time, in the structure of the cold plate, the heat conduction protection panel, the battery core to be tested, the heating sheet, the battery core to be tested, the heat conduction protection panel and the cold plate, the heat can be vertically transferred to the cold plate through the battery core body to be tested by the heating plate, the cold plate is kept stand until the battery core body to be tested enters a stable temperature gradient state, wherein, the temperature gradient state can be that the temperature difference between the upper surface and the lower surface of the battery core body to be tested is a constant value, namely, the temperature difference between one side of the battery core body to be measured, which is close to the heating plate, and one side of the battery core body to be measured, which is close to the cold plate, is a constant value, after the battery core body to be tested enters a stable temperature gradient state, the temperature of the inner side and the temperature of the outer side of the battery core body to be tested are recorded, and the numerical values of the temperature of the inner side and the temperature of the outer side of a plurality of groups of battery core bodies to be tested are obtained.
And S105, performing data fitting according to the attributes, the inner and outer temperatures of the battery cores to be tested and the power of the heating plates corresponding to the inner and outer temperatures, and calculating the heat conductivity coefficient of the battery core to be tested.
Specifically. Performing data fitting through the attributes of the battery cores to be tested, the inner and outer temperature values of the battery cores to be tested and the power of the heating plates corresponding to the inner and outer temperature values, and calculating the heat conductivity coefficient of the battery cores to be tested, wherein the data fitting can be performed through a linear fitting mode based on a least square method, and when the linear fitting is performed through the least square method, R is used for performing the linear fitting2Should be greater than 0.98.
According to the method for measuring the heat conductivity coefficient of the lithium ion battery core, the heat-conducting protection panel is wrapped in the stacking direction corresponding to the stacking of the battery core body to be measured and the heating plate, the heat-insulating protection material is wrapped in other directions, heat diffusion of the heating plate is prevented, data fitting is carried out through the measured attributes, the inner and outer side temperatures of the plurality of groups of battery core bodies to be measured and the power of the heating plate corresponding to the inner and outer side temperatures, the heat conductivity coefficient of the battery core body to be measured is calculated, and the calculation method of the heat conductivity coefficient also has the characteristic of repeatability test.
On the basis of the foregoing embodiment, the method for measuring the thermal conductivity of the lithium ion battery cell includes the following steps:
the thickness of the battery core body to be tested and the plane cross-sectional area of the battery core body to be tested.
In the embodiment of the invention, the attributes of the battery core to be tested comprise the thickness of the battery core to be tested and the plane cross-sectional area of the battery core to be tested, and the heat conductivity coefficient of the battery core to be tested is calculated by performing data fitting through the thickness of the battery core to be tested, the plane cross-sectional area of the battery core to be tested, the inner and outer side temperature values of a plurality of groups of battery cores to be tested and the power of the heating plates corresponding to the inner and outer side temperature values.
In addition, the thermal conductivity of the battery core to be tested can be calculated by the following formula:
wherein λ is the heat conductivity coefficient of the battery core to be tested, Q is the power of the heating sheet, L is the thickness of the battery core to be tested, a is the planar cross-sectional area of the battery core to be tested, and Δ T is the difference between the inside and outside temperatures.
Specifically, during data fitting, fitting is performed through the inner and outer side temperature values of the battery core to be tested and the power of the heating plate corresponding to the inner and outer side temperature values to obtain a fitting coefficient, and then the heat conductivity coefficient of the battery core to be tested is calculated by combining the thickness of the battery core to be tested and the plane cross-sectional area of the battery core to be tested.
According to the embodiment of the invention, the heat conductivity coefficient of the battery core body to be measured is calculated through the formula fitting, and the calculation method has repeatability and higher calculation result precision.
On the basis of the foregoing embodiment, the method for measuring the thermal conductivity of the lithium ion battery cell further includes:
the plane cross-sectional area of the heating sheet is larger than 80% of the plane cross-sectional area of the battery core body to be tested.
In the embodiment of the invention, when the heating sheet is stacked with the battery core body to be measured, the plane cross-sectional area of the heating sheet is larger than 80% of the plane cross-sectional area of the battery core body to be measured, because the plane cross-sectional area of the heating sheet is set to be large enough, the heat cannot be spread in the non-stacking direction of the electric measurement core body to be measured in the heat conduction process of heating the heating sheet, the influence of heat diffusion in other directions is further prevented, and the precision of the measurement result is further improved.
According to the embodiment of the invention, the plane cross-sectional area of the heating sheet is set to be larger than 80% of the plane cross-sectional area of the battery core body to be measured, so that the influence of thermal diffusion is further prevented, and the precision of the measurement result is further improved.
Fig. 2 is a diagram of a device for measuring a thermal conductivity of a lithium ion battery cell according to an embodiment of the present invention, including: a measurement module 201, a placement module 202, a setting module 203, an adjustment module 204, and a data fitting module 205, wherein:
the measuring module 201 is configured to select two battery cores to be measured and measure attributes of the battery cores to be measured.
The placing module 202 is used for placing a heating sheet between two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping the heat-conducting protective panel in the corresponding stacking direction, and wrapping the heat-insulating protective material in other directions.
And the setting module 203 is used for placing the two battery cores to be tested between the cold plates, setting the temperature of the cold plates, and standing the battery cores to be tested until the temperature is constant.
And the adjusting module 204 is used for adjusting the power of the heating sheets for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of battery core bodies are in the stable temperature gradient state.
And the data fitting module 205 is configured to perform data fitting according to the attributes, the inner and outer temperatures of the plurality of sets of battery cores to be tested, and the power of the heating plates corresponding to the inner and outer temperatures, and calculate the thermal conductivity of the battery core to be tested.
In one embodiment, the apparatus may further comprise:
the calculating module is used for calculating the heat conductivity coefficient of the battery core body to be measured through the following formula:
wherein, λ is the thermal conductivity of the battery core to be tested, Q is the power of the heating sheet, L is the thickness of the battery core to be tested, a is the planar cross-sectional area of the battery core to be tested, and Δ T is the difference between the inside and outside temperatures.
In one embodiment, the apparatus may further comprise:
and the plane cross-sectional area determining module is used for determining that the plane cross-sectional area of the heating sheet is greater than 80% of the plane cross-sectional area of the battery core body to be tested.
For specific limitations of the apparatus for measuring the thermal conductivity of the lithium ion battery cell, reference may be made to the above limitations of the method for measuring the thermal conductivity of the lithium ion battery cell, and details thereof are not repeated here. All or part of each module in the device for measuring the heat conductivity of the lithium ion battery cell can be realized by software, hardware and combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Fig. 3 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 3: a processor (processor)301, a memory (memory)302, a communication Interface (Communications Interface)303 and a communication bus 304, wherein the processor 301, the memory 302 and the communication Interface 303 complete communication with each other through the communication bus 304. The processor 301 may call logic instructions in the memory 302 to perform the following method: selecting two battery cores to be tested, and measuring the attributes of the battery cores to be tested; placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping a heat-conducting protective panel in the corresponding stacking direction, and wrapping heat-insulating protective materials in other directions; placing the two battery core bodies to be tested between cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant; adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies are in the stable temperature gradient state; and performing data fitting through the attributes, the inner and outer side temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer side temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
Furthermore, the logic instructions in the memory 302 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes: selecting two battery cores to be tested, and measuring the attributes of the battery cores to be tested; placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping a heat-conducting protective panel in the corresponding stacking direction, and wrapping heat-insulating protective materials in other directions; placing the two battery core bodies to be tested between cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant; adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies are in the stable temperature gradient state; and performing data fitting through the attributes, the inner and outer side temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer side temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for measuring the thermal conductivity of a lithium ion battery cell, the method comprising:
selecting two battery cores to be tested, and measuring the attributes of the battery cores to be tested;
placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping a heat-conducting protective panel in the corresponding stacking direction, and wrapping heat-insulating protective materials in other directions;
placing the two battery core bodies to be tested between cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant;
adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies are in the stable temperature gradient state;
and performing data fitting through the attributes, the inner and outer side temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer side temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
2. The method of measuring a thermal conductivity of a lithium ion battery cell of claim 1, wherein the property comprises:
the thickness of the battery core body to be tested and the plane cross-sectional area of the battery core body to be tested.
3. The method of measuring the thermal conductivity of the lithium ion battery cell of claim 2, wherein the thermal conductivity of the battery core to be tested is calculated by the following formula:
wherein λ is the heat conductivity coefficient of the battery core to be tested, Q is the power of the heating sheet, L is the thickness of the battery core to be tested, a is the planar cross-sectional area of the battery core to be tested, and Δ T is the difference between the inside and outside temperatures.
4. The method of measuring a thermal conductivity of a lithium ion battery cell of claim 2, further comprising:
the plane cross-sectional area of the heating sheet is larger than 80% of the plane cross-sectional area of the battery core body to be tested.
5. The method of measuring a thermal conductivity of a lithium ion battery cell of claim 1, further comprising:
the cold plate is a panel containing a circulating liquid cooling medium.
6. The method of measuring the thermal conductivity of a lithium ion battery cell of claim 1, wherein the stabilizing the temperature gradient state comprises:
and the temperature difference between the upper surface and the lower surface of the battery core body to be measured is a constant value.
7. The method of measuring a thermal conductivity of a lithium ion battery cell of claim 1, further comprising:
the data fitting is a linear fitting mode based on a least square method.
8. The utility model provides a measure device of lithium ion battery electricity core coefficient of heat conductivity which characterized in that includes:
the measuring module is used for selecting two battery core bodies to be measured and measuring the attribute of the battery core bodies to be measured;
the placing module is used for placing a heating sheet between the two battery cores to be tested, stacking the two battery cores to be tested and the heating sheet, wrapping the heat-conducting protective panel in the corresponding stacking direction, and wrapping the heat-insulating protective material in other directions;
the setting module is used for placing the two battery core bodies to be tested between the cold plates, setting the temperature of the cold plates, and standing the battery core bodies to be tested until the temperature is constant;
the adjusting module is used for adjusting the power of the heating sheet for a plurality of times, standing the battery core body to be tested after each adjustment until the battery core body to be tested enters a stable temperature gradient state, and recording the inner and outer side temperatures of the battery core body to be tested when a plurality of groups of the battery core bodies to be tested enter the stable temperature gradient state;
and the data fitting module is used for performing data fitting through the attributes, the inner and outer temperatures of the battery core body to be tested and the power of the heating plates corresponding to the inner and outer temperatures, and calculating the heat conductivity coefficient of the battery core body to be tested.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method of measuring thermal conductivity of a lithium ion battery cell of any of claims 1 to 7.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the method for measuring thermal conductivity of a lithium ion battery cell according to any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010367286.2A CN111579581A (en) | 2020-04-30 | 2020-04-30 | Method and device for measuring heat conductivity coefficient of lithium ion battery cell |
| PCT/CN2020/105685 WO2021217932A1 (en) | 2020-04-30 | 2020-07-30 | Method and apparatus for measuring thermal conductivity coefficient of lithium-ion battery cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010367286.2A CN111579581A (en) | 2020-04-30 | 2020-04-30 | Method and device for measuring heat conductivity coefficient of lithium ion battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579581A true CN111579581A (en) | 2020-08-25 |
Family
ID=72124641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010367286.2A Pending CN111579581A (en) | 2020-04-30 | 2020-04-30 | Method and device for measuring heat conductivity coefficient of lithium ion battery cell |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111579581A (en) |
| WO (1) | WO2021217932A1 (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU763757A1 (en) * | 1978-12-08 | 1980-09-15 | Научно-Исследовательский Институт Строительной Физики Госстроя Ссср | Device for measuring heat conductance of materials |
| CN101556256A (en) * | 2009-05-11 | 2009-10-14 | 天津科技大学 | Dual-flat plate thermal conductivity coefficient measuring instrument of thermal insulation materials |
| CN202171579U (en) * | 2011-05-19 | 2012-03-21 | 绍兴文理学院 | Double test piece protection hot plate method heat conducting instrument |
| CN103411996A (en) * | 2013-08-05 | 2013-11-27 | 电子科技大学 | Measuring equipment and measuring method for heat conductivity coefficients of solid materials |
| CN203758943U (en) * | 2014-03-24 | 2014-08-06 | 天津科技大学 | Material heat conduction coefficient testing and metering device |
| CN109001252A (en) * | 2018-06-28 | 2018-12-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Test device of thermal conductivity coefficient |
| CN109142431A (en) * | 2018-07-19 | 2019-01-04 | 芜湖籁余新能源科技有限公司 | A kind of Guarded hot plate heat conductivity measuring device |
| CN109490355A (en) * | 2017-09-13 | 2019-03-19 | 大唐移动通信设备有限公司 | A kind of method of test device of thermal conductivity coefficient and heat conducting coefficient measuring |
| CN110333264A (en) * | 2019-07-10 | 2019-10-15 | 北京工业大学 | The method for testing phase-change material thermal coefficient |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100412533C (en) * | 2004-02-21 | 2008-08-20 | 鸿富锦精密工业（深圳）有限公司 | Device for measuring thermal coefficient |
| CN101949873A (en) * | 2010-10-11 | 2011-01-19 | 华东师范大学 | Device for measuring solid material heat conductivity |
| JP5827097B2 (en) * | 2011-10-17 | 2015-12-02 | ニチアス株式会社 | Thermal conductivity measurement method |
| CN107966474B (en) * | 2017-12-21 | 2024-05-07 | 中国科学院理化技术研究所 | Device for measuring heat conductivity coefficient of block based on steady-state method |
| CN108681619B (en) * | 2018-04-03 | 2022-03-04 | 哈尔滨工业大学 | Method for identifying thermophysical parameters of square soft package lithium ion battery |
-
2020
- 2020-04-30 CN CN202010367286.2A patent/CN111579581A/en active Pending
- 2020-07-30 WO PCT/CN2020/105685 patent/WO2021217932A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU763757A1 (en) * | 1978-12-08 | 1980-09-15 | Научно-Исследовательский Институт Строительной Физики Госстроя Ссср | Device for measuring heat conductance of materials |
| CN101556256A (en) * | 2009-05-11 | 2009-10-14 | 天津科技大学 | Dual-flat plate thermal conductivity coefficient measuring instrument of thermal insulation materials |
| CN202171579U (en) * | 2011-05-19 | 2012-03-21 | 绍兴文理学院 | Double test piece protection hot plate method heat conducting instrument |
| CN103411996A (en) * | 2013-08-05 | 2013-11-27 | 电子科技大学 | Measuring equipment and measuring method for heat conductivity coefficients of solid materials |
| CN203758943U (en) * | 2014-03-24 | 2014-08-06 | 天津科技大学 | Material heat conduction coefficient testing and metering device |
| CN109490355A (en) * | 2017-09-13 | 2019-03-19 | 大唐移动通信设备有限公司 | A kind of method of test device of thermal conductivity coefficient and heat conducting coefficient measuring |
| CN109001252A (en) * | 2018-06-28 | 2018-12-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Test device of thermal conductivity coefficient |
| CN109142431A (en) * | 2018-07-19 | 2019-01-04 | 芜湖籁余新能源科技有限公司 | A kind of Guarded hot plate heat conductivity measuring device |
| CN110333264A (en) * | 2019-07-10 | 2019-10-15 | 北京工业大学 | The method for testing phase-change material thermal coefficient |
Non-Patent Citations (3)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局等: "《中华人民共和国国家标准 GB/T 10294-2008》", 30 June 2008 * |
| 兔子时速100: "锂离子电池极片和JR各向导热系数测量计算方法", 《百度文库》 * |
| 冯旭宁等: "锂离子电池各向异性导热的实验与建模", 《汽车安全与节能学报》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021217932A1 (en) | 2021-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cao et al. | Thermal modeling of full-size-scale cylindrical battery pack cooled by channeled liquid flow | |
| Akbarzadeh et al. | Thermal modeling of a high-energy prismatic lithium-ion battery cell and module based on a new thermal characterization methodology | |
| Xie et al. | A novel resistance‐based thermal model for lithium‐ion batteries | |
| WO2021103873A1 (en) | Battery interior temperature information processing method, computer device, and storage medium | |
| Giuliano et al. | Thermal analysis and management of lithium–titanate batteries | |
| CN112115628B (en) | Hot spot temperature detection method based on distribution calculation of temperature field of oil-immersed transformer | |
| Chang et al. | Effects of reciprocating liquid flow battery thermal management system on thermal characteristics and uniformity of large lithium‐ion battery pack | |
| CN113011007B (en) | Method and system for rapidly identifying thermal model parameters of lithium ion power battery | |
| CN111144029B (en) | Modeling method for thermoelectric coupling characteristics of lithium ion power battery | |
| Xie et al. | An improved electrothermal‐coupled model for the temperature estimation of an air‐cooled battery pack | |
| CN110220940B (en) | Method for testing heat conductivity of irregular sample | |
| CN109709137A (en) | A kind of cell water cold plate temperature uniformity test device and method | |
| Sheng et al. | Quasi steady state method to measure thermophysical parameters of cylindrical lithium ion batteries | |
| Dong et al. | Analysis of lithium-ion battery thermal models inaccuracy caused by physical properties uncertainty | |
| CN113794254A (en) | Thermal management strategy configuration method and device, computer equipment and storage medium | |
| Yang et al. | A model‐based assessment of controllable phase change materials/liquid coupled cooling system for the power lithium‐ion battery pack | |
| Kwak et al. | Detailed modeling investigation of thermal runaway pathways of a lithium iron phosphate battery | |
| CN116776691A (en) | Method and device for constructing internal temperature field test model of oil immersed transformer | |
| Lin et al. | Anisotropic Thermal Characterisation of Large‐Format Lithium‐Ion Pouch Cells | |
| CN113835031B (en) | Information processing method, apparatus, electronic device and storage medium | |
| CN111579581A (en) | Method and device for measuring heat conductivity coefficient of lithium ion battery cell | |
| Huang et al. | Thermal circuit model of prismatic lithium cell considering dynamic non-uniform characteristics during charging-discharging in energy storage | |
| Liu et al. | A novel Kalman-filter-based battery internal temperature estimation method based on an enhanced electro-thermal coupling model | |
| Cui et al. | Simplification strategy research on hard‐cased Li‐ion battery for thermal modeling | |
| Yu et al. | Thermal parameters of cylindrical power batteries: Quasi-steady state heat guarding measurement and thermal management strategies |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200825 |