WO2021217932A1

WO2021217932A1 - Method and apparatus for measuring thermal conductivity coefficient of lithium-ion battery cells

Info

Publication number: WO2021217932A1
Application number: PCT/CN2020/105685
Authority: WO
Inventors: 刘施阳; 云凤玲; 栗敬敬; 方彦彦
Original assignee: 国联汽车动力电池研究院有限责任公司
Priority date: 2020-04-30
Filing date: 2020-07-30
Publication date: 2021-11-04
Also published as: CN111579581A

Abstract

Provided are a method and apparatus for measuring the thermal conductivity coefficient of lithium-ion battery cells. The method comprises: selecting two battery cells to be measured, and measuring the properties of said battery cells; placing a heating sheet between said battery cells, stacking said battery cells and the heating sheet, wrapping said battery cells with thermally conductive protective panels in the corresponding stacking direction, and wrapping same with thermal insulation protective materials in other directions; placing said two battery cells between cold plates, setting the temperature of the cold plates, and letting said battery cells stand until the temperature is constant; regulating the power of the heating sheet several times, and letting said battery cells stand after each regulation until said battery cells enter a stable temperature gradient state, and recording the inside and outside temperatures of said battery cells; and performing data fitting according to the properties, several groups of the inside and outside temperatures of said battery cells, and the corresponding heating sheet power, so as to calculate the thermal conductivity coefficient of said battery cells. By using the method, heat diffusion of a heating sheet can be prevented, the precision of a measurement result is improved, and a method for repeatedly measuring a thermal conductivity coefficient is also provided.

Description

Method and device for measuring thermal conductivity of lithium ion battery cell

Cross-references to related applications

This application claims the priority of the Chinese patent application filed on April 30, 2020, with the application number 2020103672862 and the invention titled "Method and Device for Measuring Thermal Conductivity of Lithium Ion Battery Cells", which are fully incorporated herein by reference .

Technical field

This application relates to the field of battery parameter testing, and in particular to a method and device for measuring the thermal conductivity of a lithium-ion battery cell.

Background technique

At present, due to the advantages of high power density and good consistency, lithium-ion batteries are currently more and more used in various fields. The operation of lithium batteries includes the following actual conditions: 1. Power battery thermal management and Safety is the core technology in battery system integration. The pros and cons of the thermal management system can directly affect the power, life and overall safety of the battery system; 2. The design of an excellent thermal management system is inseparable from simulation analysis and the use of software The analysis method can effectively reduce the design time of the thermal management system, reduce the design risk, reduce the probability of problems in the later test, etc. Simulation analysis can significantly improve the design efficiency of the thermal management system; 3. Accurate physical property input is accurate The prerequisite of simulation; for the temperature field simulation often used in the design of power battery thermal management system, an accurate input of the thermophysical parameters of the battery is required; 4. The thermophysical properties include: various thermal conductivity coefficients (or thermal diffusion coefficients) ; 5. With the continuous update of cell technology and products, the accuracy of the old experience data is getting lower and lower, and the parameter database needs to be updated, and the cell products of different suppliers have different parameters. Therefore, it is necessary to measure the thermal conductivity of lithium-ion batteries.

In view of the above problems, there are currently some technologies that can measure the thermal conductivity of lithium-ion batteries, such as the protective hot plate method and the transient thermal conductivity method. However, the former is susceptible to thermal diffusion in the other two directions. Affect the accuracy of the measurement results, the latter has high requirements for equipment and poor data repeatability.

Summary of the invention

In view of the problems in the prior art, the embodiments of the present application provide a method and device for measuring the thermal conductivity of a lithium ion battery cell.

The embodiment of the present application provides a method for measuring the thermal conductivity of a lithium-ion battery cell, including:

Select two battery cores to be tested, and measure the properties of the battery cores to be tested;

Place a heating sheet between the two battery cores to be tested, and stack the two battery cores to be tested with the heating sheet, wrap the thermally conductive protective panel in the corresponding stacking direction, and in other directions Thermal insulation protection material for the upper package;

Place the two battery cores to be tested between the cold plates, set the temperature of the cold plate, and leave the battery cores 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, and record several sets of the stable temperature gradient state. State the inner and outer temperature of the battery core to be tested;

The thermal conductivity of the battery core to be tested is calculated by 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 of the battery cores.

In one of the embodiments, the attribute includes:

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 of the embodiments, the method calculates the thermal conductivity of the battery core to be tested by the following formula:

Where λ 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, and A is the plane cross-sectional area of the battery core to be tested , ΔT is the temperature difference between inside and outside.

In one of the embodiments, 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.

In one of the embodiments, the method further includes:

The cold plate is a panel containing a circulating liquid cooling medium.

In one of the embodiments, the stable temperature gradient state includes:

The temperature difference between the upper and lower surfaces of the battery core to be tested is a constant value.

In one of the embodiments, the method further includes:

The data fitting is a linear fitting method based on the least square method.

The embodiment of the application provides a device for measuring the thermal conductivity of a lithium-ion battery cell, including:

The measurement module is configured to select two battery cores to be tested and measure the properties of the battery cores to be tested;

The placement module is configured to place a heating sheet between the two battery cores to be tested, stack the two battery cores to be tested and the heating sheet, and wrap the heat conduction protection in the corresponding stacking direction Panel, wrapped with heat-insulating protective material in other directions;

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 adjustment module 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 sets of the stable temperature are recorded. The temperature of the inner and outer sides of the battery core to be tested in a temperature gradient state;

The data fitting module is configured to perform data fitting based on the attributes, several groups of the inner and outer temperatures of the battery core to be tested, and the heater power corresponding to the inner and outer temperatures, to calculate the thermal conductivity of the battery core to be tested .

An embodiment of the present application provides an electronic device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The processor executes the program to realize the above-mentioned measurement of the thermal conductivity of a lithium-ion battery cell. Steps of the method.

The embodiment of the present application provides a non-transitory computer-readable storage medium on which a computer program is stored. When 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.

The method and device for measuring the thermal conductivity of lithium-ion battery cells provided by the embodiments of the present application are achieved by wrapping the thermal conductivity protection panel in the stacking direction corresponding to the stacking of the battery core to be tested and the heating sheet, and wrapping the thermal insulation protection 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.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a flowchart of a method for measuring thermal conductivity of a lithium ion battery cell in an embodiment of the application;

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.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this 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. As shown in FIG. 1, an embodiment of the present application provides a method for measuring the thermal conductivity of a lithium-ion battery cell. include:

Step S101: Select two battery cores to be tested, and measure the properties of the battery cores to be tested.

Specifically, select two battery cores whose thermal conductivity is to be measured. 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. In addition, 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.

Specifically, after selecting two battery cores to be tested, 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 structure of the protective panel, and wrap the heat-insulating protective material in other directions, where the other directions refer to other directions other than the stacking direction. For example, the stacking direction is stacked up and down, the other directions can be 4 directions, front, back, left, and right. .

In step S103, the two battery cores to be tested are placed between the cold plates, the temperature of the cold plate is set, and the battery cores to be tested are left to stand until the temperature is constant.

Specifically, 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. In addition, the type of the cold plate can be a panel containing a circulating liquid cooling medium, which can have a certain heat dissipation capacity to facilitate the subsequent battery core to be tested to enter a stable temperature gradient state, and to prevent the battery core from overheating the circulating liquid oil bath of the cold plate The temperature should be below 10°C.

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.

Specifically, after the structural temperature of the battery core to be tested is constant, 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- In the structure of the battery core to be tested-the heat conduction protection panel-the cold 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. Among them, the temperature gradient state can be that the temperature difference between the upper and lower surfaces of the battery core to be tested is a constant value, that is, the temperature difference between the side of the battery core to be tested close to the heating plate and the side close to the cold plate is a constant value. After the core body enters a stable temperature gradient state, the inner and outer temperatures of the battery core to be tested are recorded, and the inner and outer temperature values of several groups of battery cores to be tested are obtained.

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.

specifically. According to the properties of the battery core to be tested, 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, the thermal conductivity of the battery to be tested is calculated. The result can be linear fitting method based on least square method. When linear fitting is carried out by 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.

On the basis of the foregoing embodiment, in the method for measuring the thermal conductivity of a lithium-ion battery cell, the attribute includes:

In the embodiment of this application, 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.

In addition, the thermal conductivity of the battery core to be tested can be calculated by the following formula:

Specifically, during data fitting, fitting coefficients are obtained by fitting the inner and outer temperature values of the battery core to be tested and the heating plate power corresponding to the inner and outer temperature values, and then combining the thickness of the battery core to be tested and the thickness of the battery to be tested. The plane cross-sectional area of the battery core is calculated to obtain the thermal conductivity of the battery core to be tested.

In the embodiment of the present application, 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.

On the basis of the foregoing embodiment, the method for measuring the thermal conductivity of a lithium-ion battery cell further includes:

In the embodiment of this application, when the heating plate is stacked with 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.

In the embodiment of the present application, by setting the planar cross-sectional area of the heating plate to be greater than 80% of the planar cross-sectional area of the battery core to be tested, the influence of thermal diffusion is further prevented, and the accuracy of the measurement result 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 data fitting module 205 is configured to perform data fitting based on attributes, the inner and outer temperatures of several groups of 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.

In an embodiment, 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:

Among them, λ 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, and ΔT is the temperature difference between the inner and outer sides. .

In an embodiment, 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.

For the specific definition of the device for measuring the thermal conductivity of the lithium ion battery cell, please refer to the above definition of the method for measuring the thermal conductivity of the lithium ion battery cell, which will not be repeated here. 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. As shown in FIG. 3, 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 battery core to be tested until the battery core to be tested enters a stable temperature gradient state, and the inner and outer temperatures of the battery core to be tested in several groups of the stable temperature gradient state are recorded; through the attributes, the plurality of groups Data fitting is performed on the inner and outer temperatures of the battery core to be tested and the heating plate power corresponding to the inner and outer temperatures, and the thermal conductivity of the battery core to be tested is calculated.

In addition, 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. .

On the other hand, the embodiments of the present application also provide a non-transitory computer-readable storage medium on which a computer program is stored. When 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 battery core under test and the heating corresponding to the inner and outer temperatures Data fitting is performed on the sheet power, and the thermal conductivity of the battery core to be tested is calculated.

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.

Through the description of the above implementation manners, those skilled in the art can clearly understand that 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. Based on this understanding, 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.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A method for measuring the thermal conductivity of a lithium-ion battery cell, characterized in that the method includes:

Select two battery cores to be tested, and measure the properties of the battery cores to be tested;

Place a heating sheet between the two battery cores to be tested, and stack the two battery cores to be tested with the heating sheet, wrap the thermally conductive protective panel in the corresponding stacking direction, and in other directions Thermal insulation protection material for the upper package;

Place the two battery cores to be tested between the cold plates, set the temperature of the cold plate, and leave the battery cores 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, and record several sets of the stable temperature gradient state. State the inner and outer temperature of the battery core to be tested;

The thermal conductivity of the battery core to be tested is calculated by 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 temperatures of the inner and outer sides of the battery.
The method for measuring the thermal conductivity of a lithium-ion battery cell according to claim 1, wherein the attribute includes:

The thickness of the battery core body to be tested, and the plane cross-sectional area of the battery core body to be tested.
The method for measuring the thermal conductivity of a lithium-ion battery cell according to claim 2, wherein the thermal conductivity of the battery core to be tested is calculated by the following formula:

Where λ 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, and A is the plane cross-sectional area of the battery core to be tested , ΔT is the temperature difference between inside and outside.
The method for measuring the thermal conductivity of a lithium-ion battery cell according to claim 2, wherein the method further comprises:

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 for measuring the thermal conductivity of a lithium-ion battery cell according to claim 1, wherein the method further comprises:

The cold plate is a panel containing a circulating liquid cooling medium.
The method for measuring the thermal conductivity of a lithium-ion battery cell according to claim 1, wherein the stable temperature gradient state comprises:

The temperature difference between the upper and lower surfaces of the battery core to be tested is a constant value.
The method for measuring the thermal conductivity of a lithium-ion battery cell according to claim 1, wherein the method further comprises:

The data fitting is a linear fitting method based on the least square method.
A device for measuring the thermal conductivity of a lithium-ion battery cell, which is characterized in that it comprises:

The measurement module is configured to select two battery cores to be tested and measure the properties of the battery cores to be tested;

The placement module is configured to place a heating sheet between the two battery cores to be tested, stack the two battery cores to be tested and the heating sheet, and wrap the heat conduction protection in the corresponding stacking direction Panel, wrapped with heat-insulating protective material in other directions;

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 leave the battery cores to be tested until the temperature is constant;

The adjustment module 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 sets of the stable temperature are recorded. The temperature of the inner and outer sides of the battery core to be tested in a temperature gradient state;

The data fitting module is configured to perform data fitting based on the attributes, several groups of the inner and outer temperatures of the battery core to be tested, and the heater power corresponding to the inner and outer temperatures, to calculate the thermal conductivity of the battery core to be tested .
An electronic device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, wherein the processor executes the program as described in any one of claims 1 to 7 The steps of the method for measuring the thermal conductivity of lithium-ion battery cells are described.
A non-transitory computer-readable storage medium with a computer program stored thereon, characterized in that, when the computer program is executed by a processor, the measurement of the thermal conductivity of a lithium-ion battery cell as described in any one of claims 1 to 7 is achieved Steps of the method.