CN219891333U - Measurement device and system for thermal parameters of battery cell - Google Patents

Abstract

The utility model relates to the technical field of battery measurement, in particular to a device and a system for measuring thermal parameters of an electric core. Wherein, the measuring device of electric core thermal parameter includes: a heat-insulating member; the battery cell heat insulation device comprises a heat insulation cavity for accommodating the battery cell and abutting against the periphery of the battery cell, wherein a heat dissipation window is formed in one side of the heat insulation cavity for dissipating heat of the battery cell; a heating member that heats one side of the battery cell facing away from the heat dissipation window; the heating member has an abutting end face abutting against the battery cell, and a distal end face located on the opposite side of the abutting end face and abutting against the heat-insulating member; and the thermocouples are arranged in the battery cell and/or on the surface of the battery cell and measure the temperature of the acquisition point of the battery cell. Therefore, the utility model can conveniently and accurately measure the thermal parameters of various battery cells and improve the problem of poor measurement accuracy of the thermal parameters of the battery cells.

Description

Measurement device and system for thermal parameters of battery cell

Technical Field

The utility model relates to the technical field of battery measurement, in particular to a device and a system for measuring thermal parameters of an electric core.

Background

The heat conductivity coefficient and the contact thermal resistance are important thermal parameters of the lithium ion battery, are also indispensable input parameters for battery thermal simulation, and are crucial to the calculation of heat generation/heat dissipation of the battery to directly influence the accuracy of a battery thermal simulation result. At present, because the battery has a complex structure, for example, comprises a shell, a winding core, a pole column and other structures, thermal contact resistance exists between the structures; and components such as positive and negative electrodes, a diaphragm, a current collector and the like in the battery also have anisotropism, so that the heat conductivity coefficient of the battery is difficult to calculate and obtain. The thermal parameters of the battery are obtained in the related technology mainly through theoretical calculation, namely, according to the thermal conductivity values of all materials, the anisotropic thermal conductivity of the battery monomer is calculated by adopting a thermal resistance series-parallel connection principle in the heat transfer science, but the result accuracy of the theoretical calculation method is poor, and the contact thermal resistance value cannot be estimated.

In other related technologies, an accelerated adiabatic calorimeter is adopted to provide an adiabatic environment so as to measure the thermal parameters of the battery, the measurement cost is high, the temperature difference between measurement points in the adiabatic environment is small, and the temperature error measured by the accelerated adiabatic calorimeter is difficult to calculate to obtain the accurate thermal conductivity coefficient of the battery; in addition, the cavity of the accelerating adiabatic calorimeter is fixed in size, and the shape and the size of an experimental detection object are limited, so that most of experimental objects are small soft-pack batteries, the accelerating adiabatic calorimeter is poor in universality and applicability and difficult to commonly implement, and thermal parameter measurement cannot be carried out on battery cells such as a plurality of square-shell battery cells and cylindrical battery cells.

Disclosure of Invention

The utility model provides a device and a system for measuring thermal parameters of a battery cell, which mainly aim to accurately measure the thermal parameters of various battery cells conveniently and improve the problem of poor measurement accuracy of the thermal parameters of the battery cells.

According to an aspect of the present utility model, there is provided a measurement device for thermal parameters of a battery cell, including:

the heat-insulating member comprises a heat-insulating cavity with a heat-radiating window arranged at one side; the battery cell is accommodated in the heat preservation cavity, and the peripheral side of the battery cell is abutted with the heat preservation cavity;

the heating component is used for heating one side of the battery cell, which is away from the heat dissipation window; the heating member has an abutting end surface abutting against the battery cell and a distal end surface located on an opposite side of the abutting end surface and abutting against the heat-insulating member; a kind of electronic device with high-pressure air-conditioning system

And the thermocouples are arranged in the battery cell and/or on the surface of the battery cell and measure the temperature of the acquisition point of the battery cell.

In some embodiments, a heat dissipating member comprising a heat sink having a thermal conductivity greater than 100W/(m-K) is also included, the heat sink being adapted to fit over and seal the heat dissipating window.

In some embodiments, the heat dissipating member further comprises a cooling element disposed on a side of the heat dissipating element facing away from the battery cell.

In some embodiments, further comprising a securing member comprising at least two securing plates that are paired and disposed opposite each other; at least two of the fixing plates are respectively located outside the sealing sides of the heat-preserving heat-insulating member to sandwich the heat-preserving heat-insulating member.

In some embodiments, the fixation member further comprises a spacing adjustment assembly; the interval adjusting assembly comprises adjusting pieces which are arranged between the fixing plates oppositely, and the adjusting pieces adjust the distance between the fixing plates oppositely.

In some embodiments, the two ends of the adjusting member pass through the fixing plates which are arranged oppositely, and the fixing plates are movably connected with the adjusting member along the extending direction of the adjusting member.

In some embodiments, the spacing adjustment assembly further comprises a retainer; the fixer is in threaded connection with the adjusting piece and is arranged outside the fixing plate.

In some embodiments, the thermal insulation member is made of a thermal insulation flexible material having an adjustable size range and a thermal conductivity of less than 0.1W/(m·k).

In some embodiments, the heating member is a heating sheet that provides stable heating power, the heating sheet comprising a polyimide heating sheet or a ceramic heating sheet.

According to another aspect of the present utility model, there is provided a measurement system of thermal parameters of a battery cell, comprising:

a device for measuring a thermal parameter of a cell as claimed in any one of the preceding aspects;

a power supply that supplies a target current to the heating member; and

and the temperature collector is electrically connected with the thermocouple to collect the temperature of the collection point of the battery cell.

In summary, in one or more embodiments of the present utility model, a device for measuring a thermal parameter of a battery cell includes: a heat-insulating member; the battery cell heat insulation device comprises a heat insulation cavity for accommodating the battery cell and abutting against the periphery of the battery cell, wherein a heat dissipation window is formed in one side of the heat insulation cavity for dissipating heat of the battery cell; a heating member that heats one side of the battery cell facing away from the heat dissipation window; the heating member has an abutting end face abutting against the battery cell, and a distal end face located on the opposite side of the abutting end face and abutting against the heat-insulating member; and the thermocouples are arranged in the battery cell and/or on the surface of the battery cell and measure the temperature of the acquisition point of the battery cell. Therefore, the utility model can utilize the heating component to heat the single side of the electric core with constant power and radiate heat to the opposite side of the electric core deviating from the heating component, and other parts of the electric core are all in contact with the heat preservation and insulation component to keep the heat insulation state, so that the temperature difference between the heating side and the radiating side of the electric core can be increased when the electric core thermal parameter is measured, and the error generated when the electric core thermal parameter is measured can be reduced; furthermore, a plurality of thermocouples are arranged in the battery core and/or on the surface of the battery core, so that the accuracy of the measurement of the thermal parameters of the battery core is improved, and the problem of poor measurement accuracy of the thermal parameters of the battery core is solved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a measurement device for thermal parameters of a battery cell according to an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of a device for measuring thermal parameters of a battery cell according to an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of a device for measuring thermal parameters of a battery cell according to an embodiment of the present utility model;

FIG. 4 is a schematic structural diagram of a device for measuring thermal parameters of a battery cell according to an embodiment of the present utility model;

FIG. 5 is a schematic structural diagram of a device for measuring thermal parameters of a battery cell according to an embodiment of the present utility model;

fig. 6 is a block diagram of a system for measuring thermal parameters of a battery cell according to an embodiment of the present utility model.

Reference numerals illustrate:

100. a measurement system;

10. a measuring device;

1. a heat preservation cavity; 2. a heat dissipation window; 3. a heating member; 4. a thermocouple; 5. a heat sink; 6. a cooling member; 7. a fixing member; 71. a fixing plate; 72. an adjusting member; 73. a holder;

20. a battery cell;

30. a power supply;

40. a temperature collector.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. On the contrary, the embodiments of the utility model include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.

At present, because the battery has a complex structure, for example, comprises a shell, a winding core, a pole column and other structures, thermal contact resistance exists between the structures; the components of the positive electrode, the negative electrode, the diaphragm, the current collector and the like in the battery also have anisotropism, and the thermal parameters of the battery are obtained at present mainly through theoretical calculation, namely, according to the heat conductivity values of all materials, the anisotropism heat conductivity coefficient of the battery monomer is calculated by adopting a heat resistance series-parallel connection principle in heat transfer science, but the result accuracy of the theoretical calculation method is poor, and the contact heat resistance value cannot be estimated.

In order to solve the problems, the method adopts an accelerating adiabatic calorimeter to provide an adiabatic environment so as to measure the thermal parameters of the battery, has higher measurement cost, has smaller temperature difference between measurement points of the accelerating adiabatic calorimeter in the adiabatic environment, and is difficult to calculate the temperature error measured by the accelerating adiabatic calorimeter to obtain the accurate thermal conductivity coefficient of the battery. In addition, the cavity of the accelerating adiabatic calorimeter is fixed in size, and the accelerating adiabatic calorimeter has limitation on the shape and the size of an electric core detection object, so that the accelerating adiabatic calorimeter is difficult to be universally implemented. Therefore, how to accurately measure the thermal parameters of various battery cells 20 conveniently and quickly, and improving the problem of poor measurement accuracy of the thermal parameters of the battery cells 20 is a main purpose of the improvement of the present utility model.

The present utility model will be described in detail with reference to specific examples.

Fig. 1 is a schematic structural diagram of a measurement device 10 for thermal parameters of a battery cell according to an embodiment of the utility model.

As shown in fig. 1, according to an aspect of the present utility model, there is provided a measuring device 10 of thermal parameters of a battery cell 20, including a heat-insulating member, a heating member 3, and a plurality of thermocouples 4; the heat preservation and heat insulation component comprises a heat preservation cavity 1 with a heat dissipation window 2 arranged at one side; the battery core 20 is arranged in the heat preservation cavity 1, and the periphery side of the battery core 20 is abutted with the heat preservation cavity 1. In other words, the heat insulation member includes a heat insulation cavity 1, wherein a heat dissipation window 2 is opened at one side of the heat insulation cavity 1, and the battery cells 20 to be tested are placed in the heat insulation cavity 1, wherein the number of the battery cells 20 is one, two or three. Therefore, all the electric cores 20 can be combined to be used as an electric core, wherein the heat dissipation window 2 enables part of areas of the electric core to be communicated with the outside to realize heat dissipation of the electric core, and other areas of the electric core are closely abutted with the heat preservation cavity 1 to realize heat insulation with the surrounding environment.

The heat-insulating and heat-insulating member is made of a heat-insulating flexible material with a heat conductivity coefficient of less than 0.1W/(m.K), and the heat-insulating flexible material can be rock wool, glass wool, absorbent cotton and the like, so that the heat-insulating and heat-insulating electric core has heat insulation function and micro elasticity, and the size and shape of the heat-insulating and heat-insulating electric core can be adjusted within a certain range so as to adapt to electric cores 20 with different sizes and shapes. As shown in fig. 1, the number of the electric cores 20 to be measured placed in the heat insulation cavity 1 is three, wherein the three electric cores 20 are sequentially arranged from top to bottom according to the up, down, left and right directions marked in the figure, and the adjacent electric cores 20 are closely contacted to form an electric core. In the embodiment, at least one heat dissipation window 2 is arranged on a heat preservation cavity 1 contacted with the upper part of the battery core part; preferably, the sum of the cross-sectional areas of all the heat dissipation windows 2 is smaller than the cross-sectional area of the cell portion so that the left and right sides of the cell portion are kept absolutely thermally insulated from the surrounding environment.

The heating member 3 in this embodiment heats the side of the battery cell 20 facing away from the heat dissipation window 2; the heating member 3 has an abutting end face abutting against the battery cell 20, and a distal end face located on the opposite side of the abutting end face and abutting against the heat-insulating member; in other words, the heating member 3 in the present embodiment has an abutting end face and a distal end face located on the opposite side of the abutting end face, wherein the abutting end face can be understood as an upper surface of the heating member 3 that abuts against a lower surface of the battery cell 20; while the distal face is understood to be the lower surface of the heating member 3, which faces away from the battery cell 20 and abuts against the inner wall of the insulating cavity 1. The heating member 3 is exemplified as a heating sheet for providing stable heating power, the heating sheet including a polyimide heating sheet or a ceramic heating sheet. As shown in fig. 1, three electric cores 20 and a heating member 3 are sequentially arranged from top to bottom, and when the heating member 3 operates, the temperature of the lower side of the three electric cores 20, which is close to the heating member 3, is higher than the temperature of the upper side thereof. Therefore, the utility model uses the heating component 3 to connect the constant-current voltage-stabilizing source to heat the single side of the battery cell 20 with constant power and uses the heat dissipation window 2 to dissipate heat from the opposite side away from the heating component 3, and the temperature difference between the heating side and the heat dissipation side of the battery cell 20 can be increased when the thermal parameter of the battery cell 20 is measured under the state that other parts of the battery cell 20 are kept insulated, so as to reduce the error caused by the test; the heating side of the battery cell 20 is known as the lower side near the heating member 3, and the heat dissipation side of the battery cell 20 is known as the upper side near the heat dissipation window 2.

In this embodiment, a plurality of thermocouples 4 are disposed inside the battery cell 20 and/or on the surface of the battery cell 20, and measure the temperature of the collection point of the battery cell 20. In other words, the plurality of thermocouples 4 are used to measure the temperature of the collection points of the battery cells 20, wherein the plurality of collection points of the battery cells 20 are plural, and wherein the plurality of thermocouples 4 may be disposed inside the battery cells 20; alternatively, a plurality of thermocouples 4 may be provided on the surface of the cell 20; alternatively, a plurality of thermocouples 4 may be provided on the surface of the cell 20 and inside the cell 20. For example, as shown in fig. 1, the plurality of thermocouples 4 are disposed on a side of the electric core 20 facing away from the heating member 3, and by setting the plurality of thermocouples 4, the thermal conductivity and the thermal resistance of the electric core 20 are calculated according to the temperature differences of different points, so that the measurement accuracy of the electric core 20 can be increased, and the purpose of improving the measurement accuracy of the thermal parameters of the electric core 20 is achieved.

In some embodiments, a heat dissipating member is further included, the heat dissipating member including a heat sink 5 having a thermal conductivity greater than 100W/(m·k), the heat sink 5 being adapted to be mounted on the heat dissipating window 2 and to seal the heat dissipating window 2.

In the above embodiment, the heat dissipation window 2 is used to dissipate heat from the battery cell 20, where the heat dissipation window 2 is only communicated with a partial area of the battery cell 20, and the heat dissipation window 2 dissipates heat unevenly from the heat dissipation area of the battery cell 20, so that the heat dissipation element 5 with a heat conductivity coefficient greater than 100W/(m·k) can be used to uniformly dissipate heat from the heat dissipation area of the battery cell 20. As shown in fig. 2, the heat dissipation element 5 may be made of a copper, aluminum alloy or other profile. In addition, the heat dissipation piece 5 is adaptively arranged on the heat dissipation window 2 and seals the heat dissipation window 2, so that the heat preservation cavity 1 can be sealed to better ensure the heat insulation environment, and the measurement accuracy of the battery cell 20 is improved.

In some embodiments, the heat dissipating member further comprises a cooling element 6, the cooling element 6 being arranged at a side of the heat dissipating element 5 facing away from the battery cell 20.

Wherein the heat dissipation member further comprises a cooling element 6, wherein the cooling element 6 may be arranged at a side of the heat dissipation element 5 facing away from the battery cell 20, i.e. the cooling element 6 may be arranged on the upper surface of the heat dissipation element 5, in order to further increase the temperature difference between the heating side of the battery cell 20 and the heat dissipation side of the battery cell 20 during measurement of the thermal parameters of the battery cell 20 to reduce errors due to the measurement. As illustrated in fig. 3, the cooling member 6 may be a liquid cooling plate. In addition, in the application, the measuring device 10 in the embodiment may be placed in an oven to further dissipate heat by using the oven, so as to achieve the purpose of increasing the temperature difference between the heating side of the battery cell 20 and the heat dissipation side of the battery cell 20.

In some embodiments, it also comprises a fixing member 7 comprising at least two fixing plates 71 used in pairs and arranged opposite each other; at least two fixing plates 71 are respectively located outside the sealing sides of the heat insulating members to sandwich the heat insulating members.

Wherein, the measuring device 10 of the thermal parameter of the battery cell 20 also comprises a fixing member 7; wherein the fixing member 7 comprises at least two fixing plates 71 which are used in pairs and are arranged opposite to each other, i.e. the two fixing plates 71 used in pairs are arranged opposite to each other, the fixing plates 71 may comprise two or four fixing plates which are arranged outside the sealing side of the thermal insulation member, wherein the sealing side of the thermal insulation member is understood to be the side where the heat dissipation window 2 is not arranged. The fixing plate 71 is disposed on the outer side of the sealing side of the thermal insulation member so as to clamp the thermal insulation member, which is understood as a thermal insulation member between the fixing plates 71 disposed opposite to each other, and the sealing side of the thermal insulation member is in contact with the fixing plates 71 for ensuring structural stability in the measurement process of the measuring device 10, and maintaining the shape of the thermal insulation member and facilitating transfer and transportation. As shown in fig. 4, the fixing plate 71 may include two types, and may be a profile plate of aluminum alloy, stainless steel, copper, or the like, which is superior in strength and support.

In some embodiments, the securing member 7 further comprises a spacing adjustment assembly; the spacing adjustment assembly includes an adjustment member 72 located between the oppositely disposed fixed plates 71 that adjusts the distance between the oppositely disposed fixed plates 71.

The fixing member 7 further includes a spacing adjustment assembly, which can be adjusted in a certain range according to the size and shape of the thermal insulation member, so as to adapt to the battery cells 20 with different sizes and shapes, and the spacing adjustment assembly can be set for realizing the clamping and fixing of the fixing member 7 to the thermal insulation members with different sizes and shapes. The example interval adjusting assembly as shown in fig. 4 includes an adjusting member 72 located between opposite fixing plates 71, wherein the adjusting member 72 has a rod structure, two ends of the adjusting member are respectively and vertically connected with the opposite fixing plates 71, and the middle of the adjusting member 72 is telescopic to realize clamping and fixing of heat insulation members with different sizes and shapes. Therefore, the measuring device 10 for the thermal parameters of the battery cell 20 has the advantages of simple structure, adjustable size and wide applicability, and can be used for various types of soft-package battery cells 20, square-shell battery cells 20, cylindrical battery cells 20 and the like.

In addition, in some solutions, two ends of the adjusting member 72 may also vertically pass through the fixing plates 71 disposed opposite to each other, wherein holes matched with the size of the adjusting member 72 are formed in the fixing plates 71, and the distance between the fixing plates 71 disposed opposite to each other is adjusted by moving the fixing plates 71 in the extending direction of the adjusting member 72. For example, in the present embodiment, the extending direction of the adjusting member 72 is the left-right direction indicated in fig. 2, where the adjusting member 72 is a rod member with an external thread on the outer periphery, and the hole of the fixing plate 71 has an internal thread matching the external thread. Preferably, in some embodiments, the spacing adjustment assembly further comprises a retainer 73 as shown in fig. 5, the retainer 73 being sleeved outside the adjustment member 72 and provided with internal threads that mate with the external threads of the adjustment member 72, the position of the retainer plate 71 on the adjustment member 72 being further maintained by the retainer 73 being located outside the retainer plate 71.

In the measurement device 10 for thermal parameters of the battery cell 20 in the embodiment, the heating member 3 is connected with the constant-current voltage-stabilizing source to heat the single side of the battery cell 20 with constant power and dissipate heat from the opposite side away from the heating member 3 by using the heat dissipation window 2, and the temperature difference between the heating side and the heat dissipation side of the battery cell 20 can be increased when the thermal parameters of the battery cell 20 are measured in a state that other parts of the battery cell 20 are kept insulated; meanwhile, the flexible setting of a plurality of thermocouples 4 is combined, the temperature acquisition points are increased to further reduce errors caused by measurement, the measurement results are used for thermal simulation of the battery cells 20, the heat conductivity coefficient and the heat resistance of the battery cells 20 are adjusted, the errors of the simulation results and the measurement results are adjusted to be less than 2 ℃, accurate thermal parameters of the battery cells 20 are obtained, and the thermal simulation precision of the battery cells 20 is improved. In addition, the device has low measurement cost, low environmental requirement and small measurement error, and can be adapted to the sizes of various types of battery cells 20.

Fig. 6 is a schematic structural diagram of a measurement system 100 for thermal parameters of a battery cell 20 according to an embodiment of the utility model.

As shown in fig. 6, according to another aspect of the present utility model, a measurement system 100 for thermal parameters of a battery cell 20 is provided, including: a measurement device 10 for thermal parameters of a cell 20, a power supply 30 and a temperature collector 40 according to any of the preceding aspects; wherein the power supply 30 is a constant-current voltage-stabilizing source and provides a target current for the heating member 3 to heat the battery cell 20 with constant power; and the temperature collector 40 is electrically connected to the plurality of thermocouples 4 to collect the collection point temperature of the current collector 20.

The principle of use of the measurement system 100 for thermal parameters of the battery cell 20 in this embodiment is as follows: the measurement device 10 is connected with the power supply 30 and the temperature collector 40, a fixed heating power is given to the battery cell 20, the temperatures of two corresponding collection points in the battery cell 20 are measured through the thermocouple 4, the temperatures of the two collection points are collected through the temperature collector 40 to obtain a temperature difference delta T of the two collection points, and the heat conductivity coefficient can be calculated, wherein the heat conductivity coefficient calculation formula is as follows:

wherein Q represents a heat flow rate in W; l represents the distance between two acquisition points, and the unit is m; a is the heat conduction area, and the unit is m ² The method comprises the steps of carrying out a first treatment on the surface of the Lambda is the thermal conductivity of the material, also known as thermal conductivity, in W/(mC).

It should be explained that, in the above measurement of the temperature of the thermocouple 4 at two corresponding collection points in the position of the electric core 20, the two collection points corresponding to the position refer to the connection line of the two collection points being perpendicular to the heating side of the electric core 20 or parallel to the heating side of the electric core 20, wherein the calculated thermal conductivity coefficient includes an axial thermal conductivity coefficient and a spreading thermal conductivity coefficient, which are not described herein in detail as common knowledge in the art.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A device for measuring thermal parameters of a cell, comprising:

the heat-insulating member comprises a heat-insulating cavity (1) with a heat-radiating window (2) arranged at one side; the battery cell (20) is arranged in the heat preservation cavity (1), and the peripheral side of the battery cell (20) is abutted to the heat preservation cavity (1);

a heating element (3) which heats the side of the battery cell (20) facing away from the heat dissipation window (2); the heating member (3) has an abutting end surface abutting against the battery cell (20) and a distal end surface located on the opposite side of the abutting end surface and abutting against the heat-insulating member; a kind of electronic device with high-pressure air-conditioning system

And a plurality of thermocouples (4) which are arranged in the battery cell (20) and/or on the surface of the battery cell (20) and measure the temperature of the collection point of the battery cell (20).

2. The device for measuring thermal parameters of a battery cell according to claim 1, further comprising a heat dissipation member comprising a heat sink (5) having a thermal conductivity greater than 100W/(m-K), said heat sink (5) being adapted to be mounted on said heat dissipation window (2) and to seal said heat dissipation window (2).

3. The device for measuring thermal parameters of a battery cell according to claim 2, characterized in that the heat dissipation member further comprises a cooling element (6), the cooling element (6) being arranged at a side of the heat dissipation element (5) facing away from the battery cell (20).

4. A device for measuring thermal parameters of a cell according to any of claims 1-3, characterized in that it further comprises a fixing member (7) comprising at least two fixing plates (71) used in pairs and arranged opposite each other; at least two of the fixing plates (71) are respectively located outside the sealing sides of the heat-insulating members to sandwich the heat-insulating members.

5. The measurement device of cell thermal parameters according to claim 4, characterized in that the fixing member (7) further comprises a spacing adjustment assembly; the spacing adjustment assembly includes an adjustment member (72) located between the oppositely disposed fixed plates (71); the adjusting member (72) adjusts a distance between the fixing plates (71) disposed opposite to each other.

6. The device for measuring thermal parameters of cells according to claim 5, wherein both ends of the regulating member (72) pass through the fixing plates (71) arranged opposite to each other, and the fixing plates (71) are movably connected with the regulating member (72) along the extending direction of the regulating member (72).

7. The device for measuring thermal parameters of cells according to claim 6, wherein the spacing adjustment assembly further comprises a holder (73); the fixing device (73) is in threaded connection with the adjusting piece (72) and is arranged outside the fixing plate (71).

8. The device for measuring thermal parameters of cells according to claim 4, wherein the heat-insulating and heat-insulating member is made of a heat-insulating flexible material with adjustable size range and a thermal conductivity coefficient of less than 0.1W/(m-K).

9. The device for measuring thermal parameters of electrical cells according to claim 4, characterized in that the heating member (3) is a heating plate providing a stable heating power, said heating plate comprising a polyimide heating plate or a ceramic heating plate.

10. A system for measuring a thermal parameter of a cell, comprising:

a device for measuring thermal parameters of a battery cell (20) according to any of claims 1-9;

a power supply (30) that supplies a target current to the heating member (3); and

and the temperature collector (40) is electrically connected with the thermocouple (4) and used for collecting the temperature of the collecting point of the battery cell (20).