Battery heat conductivity coefficient testing device

Abstract

The utility model belongs to the technical field of battery heat conductivity coefficient testing, and discloses a battery heat conductivity coefficient testing device which comprises a heating film and two liquid cooling plates. The heating film is used for being clamped between two batteries to be tested, a center thermocouple is arranged at the center of the heating film, and the center thermocouple can collect the temperature of the center of the heating film. The two to-be-tested batteries are clamped between the two liquid cooling plates, a plurality of preset point positions are respectively arranged on two outer side surfaces, which are opposite to each other, of the two to-be-tested batteries, a plurality of first thermocouples and a plurality of second thermocouples are respectively arranged on the two outer side surfaces, the plurality of first thermocouples can collect temperatures of the plurality of preset point positions on one to-be-tested battery, and the plurality of second thermocouples can collect temperatures of the plurality of preset point positions on the other to-be-tested battery. And the plurality of second thermocouples can collect the temperature of a plurality of preset point positions on another battery to be detected. The battery heat conductivity coefficient testing device can accurately and quickly measure the anisotropic heat conductivity coefficient of the battery to be tested.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal conductivity testing technology, and in particular to a battery thermal conductivity testing device. Background Technology

[0002] Compared with other types of batteries, lithium-ion batteries have the characteristics of high energy density, high charge-discharge conversion efficiency and long cycle life, and are widely used in electric vehicles, energy storage, back-end power supplies, communication base stations and other fields.

[0003] Temperature is a crucial factor affecting the lifespan and performance of lithium batteries. The capacity, efficiency, and charge / discharge characteristics of batteries vary significantly at different temperatures. Therefore, thorough thermal simulation analysis is necessary during the product development phase to ensure that lithium batteries can operate at their optimal temperature.

[0004] The thermal conductivity of lithium batteries is a crucial parameter in thermal simulations, typically including the thermal conductivity in the X, Y, and Z directions. Its accuracy directly impacts the simulation results. Currently, the thermal conductivity of lithium batteries is most commonly tested using thermal conductivity meters or steady-state methods.

[0005] Thermal conductivity testers can only test homogeneous isotropic materials. For highly anisotropic objects like lithium batteries, the test results are not accurate. Furthermore, thermal conductivity testers are expensive, resulting in high testing costs.

[0006] The steady-state method can test anisotropic materials, but the temperature it uses comes from the data when the entire system reaches thermal equilibrium, and it cannot take into account the temperature change process before reaching thermal equilibrium, so its calculation results have limitations.

[0007] Therefore, there is an urgent need for a battery thermal conductivity testing device to solve the above problems. Utility Model Content

[0008] The purpose of this invention is to provide a battery thermal conductivity testing device that can accurately and quickly measure the anisotropic thermal conductivity of the battery under test.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] A battery thermal conductivity testing device, comprising:

[0011] A heating film is used to sandwich between two parallel and fitted batteries to be tested. A central thermocouple is provided at the center of the heating film, and the central thermocouple can collect the temperature at the center of the heating film.

[0012] Two liquid cooling plates are used to clamp the two batteries under test between the two liquid cooling plates. Multiple preset points are respectively set on the two outer surfaces of the two batteries under test facing away from each other. Multiple first thermocouples and multiple second thermocouples are respectively set on the two outer surfaces. The multiple first thermocouples can collect the temperature of the multiple preset points on one battery under test, and the multiple second thermocouples can collect the temperature of the multiple preset points on the other battery under test.

[0013] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, the battery thermal conductivity testing device further includes a liquid cooler, and the two liquid cooling plates are respectively connected to the liquid cooler, and the coolant in the two liquid cooling plates can be circulated through the liquid cooler respectively.

[0014] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, a first liquid supply pipe and a first liquid return pipe are provided between the liquid cooler and the liquid cooling plate. The liquid cooler is connected to the liquid inlet of the liquid cooling plate through the first liquid supply pipe and to the liquid outlet of the liquid cooling plate through the first liquid return pipe.

[0015] A second liquid supply pipe and a second liquid return pipe are provided between the liquid chiller and the other liquid cooling plate. The liquid chiller is connected to the liquid inlet of the liquid cooling plate through the second liquid supply pipe and to the liquid outlet of the liquid cooling plate through the second liquid return pipe.

[0016] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, the battery thermal conductivity testing device further includes a heat insulation structure, in which the two batteries to be tested and the two liquid cooling plates are disposed.

[0017] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, the battery thermal conductivity testing device further includes a liquid cooler. A first liquid supply pipe and a first liquid return pipe are provided between the liquid cooler and a liquid cooling plate. The liquid cooler is connected to the liquid inlet of the liquid cooling plate through the first liquid supply pipe and to the liquid outlet of the liquid cooling plate through the first liquid return pipe. The heat insulation structure provides a first channel and a second channel corresponding to the first liquid supply pipe and the first liquid return pipe, respectively. A first sealing ring is provided between the first channel and the first liquid supply pipe, and a second sealing ring is provided between the second channel and the first liquid return pipe.

[0018] A second liquid supply pipe and a second liquid return pipe are provided between the liquid chiller and the other liquid cooling plate. The liquid chiller is connected to the liquid inlet of the liquid cooling plate through the second liquid supply pipe and to the liquid outlet of the liquid cooling plate through the second liquid return pipe. The insulation structure has a third channel and a fourth channel respectively corresponding to the second liquid supply pipe and the second liquid return pipe. A third sealing ring is provided between the third channel and the second liquid supply pipe, and a fourth sealing ring is provided between the fourth channel and the second liquid return pipe.

[0019] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, the plurality of preset points on each of the outer surfaces include a plurality of first points arranged along a first direction and a plurality of second points arranged along a second direction, wherein the first direction is perpendicular to the second direction.

[0020] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, a plurality of the first points are arranged at intervals along the first direction from the center of the outer side to the edge of the outer side, and the interval distance gradually decreases.

[0021] Multiple second points are arranged at intervals along the second direction from the center of the outer side to the edge of the outer side, with the interval gradually decreasing.

[0022] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, the area of ​​the heating film is smaller than the area of ​​the contact surfaces of the two batteries under test facing each other.

[0023] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, a thermally conductive adhesive layer is provided between the battery under test and the liquid cooling plate.

[0024] As a preferred embodiment of the battery thermal conductivity testing device provided by this utility model, an adhesive layer is provided between the heating film and the battery under test.

[0025] The beneficial effects of this utility model are:

[0026] The battery thermal conductivity testing device provided by this utility model includes a heating film and two liquid-cooled plates. The heating film is sandwiched between two parallel and closely fitted batteries under test. A central thermocouple is located at the center of the heating film, which can collect the temperature at the center of the heating film. The two batteries under test are sandwiched between the two liquid-cooled plates. Multiple preset points are respectively set on the two opposite outer surfaces of the two batteries under test. Multiple first thermocouples and multiple second thermocouples are respectively set on the two outer surfaces. The multiple first thermocouples can collect the temperature of multiple preset points on one battery under test, and the multiple second thermocouples can collect the temperature of multiple preset points on the other battery under test. The heating film is used to heat the two batteries under test. During the heating process, the temperature at the center of the heating film and multiple locations on the two batteries under test can be measured through the central thermocouple, the multiple first thermocouples, and the multiple second thermocouples. The temperature data collected by the central thermocouple, the multiple first thermocouples, and the multiple second thermocouples can be further used to calculate the anisotropic thermal conductivity of the batteries under test. By incorporating a liquid cooling plate, the two batteries under test can quickly achieve thermal equilibrium throughout their interiors, while maintaining a relatively constant ambient temperature. This reduces the impact of ambient temperature on the calculation of the anisotropic thermal conductivity of the batteries under test, enabling accurate and rapid measurement of the anisotropic thermal conductivity. Furthermore, the battery thermal conductivity testing device provided in this application is simple and inexpensive, which is beneficial for meeting the large-scale testing needs of factories. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery thermal conductivity testing device provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the arrangement of multiple first thermocouples on the battery under test according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the arrangement of multiple second thermocouples on the battery under test according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the arrangement of the central thermocouple and heating film provided in an embodiment of the present invention;

[0032] Figure 5This is a flowchart of the battery thermal conductivity testing method provided in an embodiment of the present invention.

[0033] In the picture:

[0034] 10. Battery to be tested;

[0035] 30. Heating film; 31. Central thermocouple;

[0036] 40. Liquid cooling plate;

[0037] 60. Liquid chiller; 61. First liquid supply pipe; 62. First liquid return pipe; 63. Second liquid supply pipe; 64. Second liquid return pipe;

[0038] 70. Thermal insulation structure;

[0039] 81. First thermocouple; 82. Second thermocouple. Detailed Implementation

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] Figure 1This diagram shows a battery thermal conductivity testing device provided in an embodiment of the present invention. Figure 2 This diagram illustrates the arrangement of multiple first thermocouples on the battery under test according to an embodiment of the present invention. Figure 3 This diagram illustrates the arrangement of multiple second thermocouples on the battery under test according to an embodiment of the present invention. Figure 4 This diagram illustrates the arrangement of the central thermocouple and heating film according to an embodiment of the present invention. (Refer to...) Figures 1-4 This embodiment provides a battery thermal conductivity testing device.

[0050] Reference Figure 1 and Figure 4 The battery thermal conductivity testing device includes a heating film 30, a central thermocouple 31, and two liquid cooling plates 40.

[0051] Specifically, two batteries 10 to be tested are arranged in parallel to each other, and a heating film 30 is used to sandwich the two batteries 10 to be tested. A central thermocouple 31 is provided at the center of the heating film 30, and the central thermocouple 31 can collect the temperature at the center of the heating film 30.

[0052] In some embodiments, the heating film 30 may be a PI heating film, a silicone film, or an epoxy resin film, etc.; in some embodiments, the thickness of the heating film 30 is 0.01mm to 0.5mm. Since the thickness of the heating film 30 is much smaller than the thickness of the battery under test 10, when the heating film 30 is sandwiched between two batteries under test 10, the two batteries under test 10 can still be regarded as being attached together.

[0053] More specifically, the two batteries under test 10 are sandwiched between the two liquid cooling plates 40. Multiple preset points are respectively set on the two opposite outer surfaces of the two batteries under test 10. Multiple first thermocouples 81 and multiple second thermocouples 82 are respectively set on the two outer surfaces. The multiple first thermocouples 81 can collect the temperature of the multiple preset points on one battery under test 10, and the multiple second thermocouples 82 can collect the temperature of the multiple preset points on the other battery under test 10. The temperature data collected by the central thermocouple 31, the multiple first thermocouples 81, and the multiple second thermocouples 82 can be further used to calculate the anisotropic thermal conductivity of the battery under test 10. In some specific embodiments, the plurality of first thermocouples 81 and the plurality of second thermocouples 82 can be all disposed on the inner surfaces of the two liquid cooling plates 40 near the battery under test 10 or on the outer surfaces of the two batteries under test 10, or they can be partially disposed on the outer surfaces of the batteries under test 10 and partially disposed on the inner surfaces of the liquid cooling plates 40. In some preferred embodiments, the plurality of first thermocouples 81 are disposed on the outer surface of one battery under test 10 and the plurality of second thermocouples 82 are disposed on the outer surface of the other battery under test 10 to improve the accuracy of the test temperature.

[0054] In some embodiments, multiple preset points are symmetrically arranged relative to the mating surfaces of the two batteries under test 10, that is, multiple preset points on the outer surface of one battery under test 10 and multiple preset points on the outer surface of the other battery under test 10 are symmetrically arranged relative to the two mating surfaces, thereby ensuring the consistency and accuracy of the test temperature.

[0055] In some embodiments, a plurality of first thermocouples 81 and a plurality of second thermocouples 82 are respectively provided at a plurality of preset points on two outer surfaces of the two batteries under test 10, and a central thermocouple 31 is provided at the center point of the heating film 30; wherein, the plurality of preset points are symmetrically arranged relative to the mating surfaces of the two batteries under test 10.

[0056] In this embodiment, the battery under test 10 can be a lithium-ion battery, but it is not limited thereto. In other embodiments, the battery under test 10 can also be a sodium-ion battery, a lithium-sulfur battery, a sodium-sulfur battery, etc. Furthermore, in this embodiment, the two batteries under test 10 are two identical batteries, and the two liquid cooling plates 40 are made of the same material, that is, two liquid cooling plates with the same heat conduction effect.

[0057] More specifically, the battery thermal conductivity testing device also includes a liquid cooler 60, with two liquid cooling plates 40 respectively connected to the liquid cooler 60. The coolant in the two liquid cooling plates 40 can circulate through the liquid cooler 60. Through the two liquid cooling plates 40, the two batteries under test 10 can quickly achieve thermal equilibrium throughout their interiors, reducing the influence of ambient temperature on the calculated anisotropic thermal conductivity of the batteries under test 10. Furthermore, the liquid cooling plates 40 are typically made of ordinary stainless steel, and the coolant can be recycled. Therefore, this application can quickly achieve the thermal equilibrium conditions required for adiabatic testing at a relatively low cost.

[0058] More specifically, such as Figure 1 As shown, a first supply pipe 61 and a first return pipe 62 are provided between the liquid cooler 60 and the liquid cooling plate 40. The liquid cooler 60 is connected to the liquid inlet of the liquid cooling plate 40 through the first supply pipe 61 and to the liquid outlet of the liquid cooling plate 40 through the first return pipe 62. Similarly, a second supply pipe 63 and a second return pipe 64 are provided between the liquid cooler 60 and the other liquid cooling plate 40. The liquid cooler 60 is connected to the liquid inlet of the liquid cooling plate 40 through the second supply pipe 63 and to the liquid outlet of the liquid cooling plate 40 through the second return pipe 64. Through the various pipes provided between the liquid cooler 60 and the two liquid cooling plates 40, the coolant in the liquid cooling plate 40 can be circulated to ensure a constant coolant temperature in the liquid cooling plate 40, thus providing a relatively stable ambient temperature for the battery under test 10 during or before the operation of the heating film 30.

[0059] In some embodiments, the flow rates of both liquid cooling plates 40 are set to A1, and the flow rate of the liquid chiller 60 is 2×A1; in some specific embodiments, A1 is 4L / min to 5L / min.

[0060] Preferably, the area of ​​the larger surface of the liquid cooling plate 40 facing the battery 10 under test (i.e., the inner surface of the liquid cooling plate 40) is larger than the area of ​​the larger surface of the battery 10 under test facing the liquid cooling plate 40 (i.e., the contact surface of the battery 10 under test relative to the liquid cooling plate 40), so as to ensure that the liquid cooling plate 40 can completely cover the battery 10 under test, thereby ensuring the temperature uniformity of the liquid cooling plate 40 on the battery 10 under test.

[0061] More specifically, a thermally conductive adhesive layer is provided between the battery under test 10 and the liquid cooling plate 40. This adhesive layer improves the thermal conductivity between the liquid cooling plate 40 and the battery under test 10, allowing the battery under test 10 to reach thermal equilibrium more quickly. In this embodiment, the thickness of the thermally conductive adhesive layer is 0.1 mm, and its thermal conductivity is known.

[0062] More specifically, the battery thermal conductivity testing device also includes a thermal insulation structure 70, in which the two batteries under test 10 and the two liquid cooling plates 40 are disposed. In this embodiment, the thermal insulation structure 70 may specifically be an aerogel thermal insulation felt, which is wrapped around the outside of the two batteries under test 10 and the two liquid cooling plates 40.

[0063] It should be noted that the insulation structure 70 has a first channel and a second channel corresponding to the first supply pipe 61 and the first return pipe 62, respectively. A first sealing ring is provided between the first channel and the first supply pipe 61, and a second sealing ring is provided between the second channel and the first return pipe 62. The insulation structure 70 also has a third channel and a fourth channel corresponding to the second supply pipe 63 and the second return pipe 64, respectively. A third sealing ring is provided between the third channel and the second supply pipe 63, and a fourth sealing ring is provided between the fourth channel and the second return pipe 64. Through the above arrangement, the internal structure of the insulation structure 70 can be thermally insulated from the external environment.

[0064] Continue to refer to Figure 1 The area of ​​the heating film 30 is smaller than the area of ​​the mating surfaces of the two batteries under test 10 facing each other. In this embodiment, the heating film 30 is made as small as possible. With the above arrangement, the influence of the heating film 30 on the heat conduction at multiple first points and multiple second points on the two batteries under test 10 can be minimized.

[0065] Preferably, an adhesive layer is provided between the heating film 30 and the battery under test 10. This adhesive layer enables a reliable connection between the heating film 30 and the two batteries under test 10.

[0066] Continue to refer to Figure 2 and Figure 3 One of the batteries under test 10 has a preset point at the center of its outer surface, corresponding to a first thermocouple 81. Multiple other preset points are spaced apart along a first direction and a second direction, starting from the center of the battery under test 10. The remaining first thermocouples 81 are arranged one-to-one on each of the other preset points. Similarly, another battery under test 10 has a preset point at the center of its outer surface, corresponding to a second thermocouple 82. Multiple other preset points are spaced apart along a first direction and a second direction, starting from the center of the battery under test 10. The remaining second thermocouples 82 are arranged one-to-one on each of the other preset points. The first direction and the second direction are perpendicular. In this embodiment, the first direction and the second direction are perpendicular to each other, with the first direction parallel to the length direction of the battery under test 10 and the second direction parallel to the width direction of the battery under test 10.

[0067] Continue to refer to Figure 2 and Figure 3 Multiple first points are arranged at intervals along the first direction from the center of the outer side to the edge of the outer side, with the interval gradually decreasing. Multiple second points are arranged at intervals along the second direction from the center of the outer side to the edge of the outer side, with the interval gradually decreasing, thereby achieving a temperature closer to that generated by the thermal conductivity of the battery material itself.

[0068] Specifically, refer to Figure 2 A first thermocouple 81 is disposed at the center of one battery under test 10, and a plurality of other first thermocouples 81 are disposed at intervals in a first direction and a second direction, with the center of the corresponding battery under test 10 as the starting point. Similarly, a second thermocouple 82 is disposed at the center of another battery under test 10, and a plurality of other second thermocouples 82 are disposed at intervals in a first direction and a second direction, with the center of the corresponding battery under test 10 as the starting point.

[0069] In some embodiments, the plurality of preset points on each outer surface include a plurality of first points arranged along a first direction and a plurality of second points arranged along a second direction. In some embodiments, the first thermocouple 81 specifically comprises five, wherein one first thermocouple 81 is disposed at the center of the battery 10 under test, two first thermocouples 81 are spaced apart in the first direction, and two first thermocouples 81 are spaced apart in the second direction. Similarly, the second thermocouple 82 specifically comprises five, wherein one second thermocouple 82 is disposed at the center of another battery 10 under test, two second thermocouples 82 are spaced apart in the first direction, and two second thermocouples 82 are spaced apart in the second direction.

[0070] Figure 5 This is a flowchart of the battery thermal conductivity testing method provided in the embodiments of the present invention, referred to... Figure 5 This embodiment also provides a method for testing the thermal conductivity of a battery. This method is based on the battery thermal conductivity testing apparatus provided in this embodiment to test the thermal conductivity of the battery.

[0071] The thermal conductivity testing method provided in this embodiment includes the following steps:

[0072] S100, Perform thermal insulation test on the battery under test 10;

[0073] S200: Build a simulation model, and this simulation model is consistent with the test model of S100;

[0074] S300 Simulation test: Execute the test process of S100. The simulation time is the acquisition duration T. Collect the temperature of multiple preset points on the two outer surfaces of the two batteries under test 10 in the simulation model and record them as temperature set Y.

[0075] S400 Simulation calculation: Using an optimization algorithm, the three-dimensional thermal conductivity of the battery under test 10 is optimized based on the temperature set X and the temperature set Y.

[0076] It should be noted that the above insulation test needs to be carried out in the heat-insulating environment formed by the sealed insulation structure 70.

[0077] By conducting the adiabatic test on the battery 10 described above, we can conduct an actual experiment on the temperature change process of the battery 10 before it reaches thermal equilibrium, providing a practical data foundation for subsequent simulation tests and calculations. The steps for building the simulation model described above ensure the accuracy of the results of subsequent simulation tests and calculations. The simulation test steps described above provide basic data for optimization in subsequent simulation calculations. The simulation calculation steps described above allow us to quickly and accurately obtain the three-dimensional thermal conductivity of the battery 10 under test.

[0078] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery thermal conductivity testing device, characterized in that, include: A heating film (30) is used to be sandwiched between two parallel and fitted batteries (10) to be tested. A central thermocouple (31) is provided at the center of the heating film (30). The central thermocouple (31) can collect the temperature at the center of the heating film (30). Two liquid cooling plates (40) are used to sandwich two batteries under test (10) between the two liquid cooling plates (40). Multiple preset points are respectively set on the two outer surfaces of the two batteries under test (10) facing away from each other. Multiple first thermocouples (81) and multiple second thermocouples (82) are respectively set on the two outer surfaces. The multiple first thermocouples (81) can collect the temperature of multiple preset points on one battery under test (10), and the multiple second thermocouples (82) can collect the temperature of multiple preset points on the other battery under test (10).

2. The battery thermal conductivity testing device according to claim 1, characterized in that, The battery thermal conductivity testing device also includes a liquid cooler (60), and the two liquid cooling plates (40) are respectively connected to the liquid cooler (60), and the coolant in the two liquid cooling plates (40) can be circulated through the liquid cooler (60) respectively.

3. The battery thermal conductivity testing device according to claim 2, characterized in that, A first liquid supply pipe (61) and a first liquid return pipe (62) are provided between the liquid chiller (60) and the liquid cooling plate (40). The liquid chiller (60) is connected to the liquid inlet of the liquid cooling plate (40) through the first liquid supply pipe (61) and to the liquid outlet of the liquid cooling plate (40) through the first liquid return pipe (62). A second liquid supply pipe (63) and a second liquid return pipe (64) are provided between the liquid chiller (60) and the other liquid cooling plate (40). The liquid chiller (60) is connected to the liquid inlet of the liquid cooling plate (40) through the second liquid supply pipe (63) and to the liquid outlet of the liquid cooling plate (40) through the second liquid return pipe (64).

4. The battery thermal conductivity testing device according to claim 1, characterized in that, The battery thermal conductivity testing device also includes a heat insulation structure (70), in which the two batteries to be tested (10) and the two liquid cooling plates (40) are disposed.

5. The battery thermal conductivity testing device according to claim 4, characterized in that, The battery thermal conductivity testing device further includes a liquid cooler (60). A first liquid supply pipe (61) and a first liquid return pipe (62) are provided between the liquid cooler (60) and a liquid cooling plate (40). The liquid cooler (60) is connected to the liquid inlet of the liquid cooling plate (40) through the first liquid supply pipe (61) and to the liquid outlet of the liquid cooling plate (40) through the first liquid return pipe (62). The heat insulation structure (70) has a first channel and a second channel respectively corresponding to the first liquid supply pipe (61) and the first liquid return pipe (62). A first sealing ring is provided between the first channel and the first liquid supply pipe (61), and a second sealing ring is provided between the second channel and the first liquid return pipe (62). A second liquid supply pipe (63) and a second liquid return pipe (64) are provided between the liquid chiller (60) and the other liquid cooling plate (40). The liquid chiller (60) is connected to the liquid inlet of the liquid cooling plate (40) through the second liquid supply pipe (63) and to the liquid outlet of the liquid cooling plate (40) through the second liquid return pipe (64). The heat preservation structure (70) has a third channel and a fourth channel respectively corresponding to the second liquid supply pipe (63) and the second liquid return pipe (64). A third sealing ring is provided between the third channel and the second liquid supply pipe (63), and a fourth sealing ring is provided between the fourth channel and the second liquid return pipe (64).

6. The battery thermal conductivity testing device according to claim 1, characterized in that, The plurality of preset points on each of the outer surfaces include a plurality of first points set along a first direction and a plurality of second points set along a second direction, wherein the first direction is perpendicular to the second direction.

7. The battery thermal conductivity testing device according to claim 6, characterized in that, Multiple first points are arranged at intervals along the first direction from the center of the outer side to the edge of the outer side, and the interval distance gradually decreases; Multiple second points are arranged at intervals along the second direction from the center of the outer side to the edge of the outer side, with the interval gradually decreasing.

8. The battery thermal conductivity testing device according to claim 1, characterized in that, The area of ​​the heating film (30) is smaller than the area of ​​the mating surfaces of the two batteries under test (10) facing each other.

9. The battery thermal conductivity testing apparatus according to any one of claims 1-8, characterized in that, A thermally conductive adhesive layer is provided between the battery under test (10) and the liquid cooling plate (40).

10. The battery thermal conductivity testing apparatus according to any one of claims 1-8, characterized in that, An adhesive layer is provided between the heating film (30) and the battery under test (10).

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