Heat conductivity coefficient testing device and testing system
By designing a thermal conductivity testing device that combines sliding and insulating components within the housing, the problem of high testing costs for batteries of different sizes was solved, enabling rapid positioning and efficient measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
- Filing Date
- 2025-01-20
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, testing the thermal conductivity of batteries requires customized fixtures of different sizes, resulting in high testing costs and long cycles.
Design a thermal conductivity testing device that includes a housing, a cover plate, a heating component, and a sliding component. By combining the sliding component and the heat insulation component, it can adapt to the clamping of batteries of different sizes and reduce the diverse requirements of clamping equipment.
It enables rapid positioning and thermal conductivity measurement of different battery models, reducing testing costs and improving testing efficiency and versatility.
Smart Images
Figure CN224152393U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery testing technology, and in particular to a thermal conductivity testing device and testing system. Background Technology
[0002] Lithium-ion batteries operate within a temperature range of 20-50℃; exceeding this temperature significantly impacts their performance and safety. Currently, the industry primarily utilizes thermal management systems to control battery temperature and keep it within the operating range. The design of thermal management strategies within these systems requires CFD simulations to model the battery's cooling or heating structures in order to design corresponding thermal management strategies. The thermal properties of lithium-ion batteries, such as thermal conductivity and specific heat capacity, are crucial factors in the accuracy of CFD simulations.
[0003] Currently, most tests on the thermal conductivity of batteries are based on the steady-state planar heat source method to perform adiabatic tests on the batteries to obtain their thermal conductivity. However, this method requires customized heating plates, insulation cotton, and fixtures for batteries of different sizes, resulting in high testing costs and long development cycles.
[0004] Therefore, there is an urgent need to provide a thermal conductivity testing device and system to address the problems existing in the prior art to some extent. Utility Model Content
[0005] The purpose of this invention is to provide a battery thermal conductivity testing device and system, which can solve to some extent the problem that it is necessary to customize matching fixtures of corresponding sizes when testing the thermal conductivity of batteries of different sizes, resulting in high testing costs.
[0006] This utility model provides a thermal conductivity testing device, including a housing, a cover plate, a heating component, and a sliding component; the housing forms an accommodating space, the cover plate covers the opening of the housing, and the heating component is disposed at the bottom of the accommodating space; the sliding component includes a sliding member and a first heat insulation member, the sliding member is located on at least one side wall of the housing, and the sliding member can penetrate the side wall of the housing and slide relative to the side wall of the housing, the first heat insulation member is correspondingly connected to the sliding member to form at least one clamping surface along a direction parallel to the side wall of the housing where the sliding member is located.
[0007] There are multiple sliding members and multiple first heat insulation members, and multiple first heat insulation members are arranged corresponding to the sliding members. The multiple adjacent sliding members slide to a preset position to form a clamping surface of a set area.
[0008] Specifically, the box body is rectangular, and the sliding member and the first heat insulation member are provided on two adjacent side walls of the box body.
[0009] Furthermore, the sliding member and the first heat insulation member are provided on all four sides of the box and on the cover plate.
[0010] Furthermore, the sliding members on two opposite side walls of the housing are arranged in a one-to-one correspondence, and the sliding members on the other two opposite side walls are arranged in a one-to-one correspondence.
[0011] The heating component includes a heating plate and a connecting wire. The heating plate is laid at the bottom of the accommodating space. One end of the connecting wire is connected to the heating plate, and the other end extends out of the housing and is connected to an external power source.
[0012] Specifically, a second heat insulation component is laid at the bottom of the housing, and the heating plate is disposed on the second heat insulation component; the shape of the second heat insulation component is adapted to the shape of the heating plate, and the area of the second heat insulation component is not less than the area of the heating plate. The areas of the heating plate and the second heat insulation component are both smaller than the bottom area of the housing, so that a receiving groove is formed between the heating plate and the second heat insulation component and the side wall of the housing for accommodating the connecting wire.
[0013] Furthermore, the lowest height of the first heat insulation member located on a row of sliding members near the bottom of the housing is greater than the overall height of the second heat insulation member and the heating plate; the thickness of the second heat insulation member is greater than the thickness of the first heat insulation member.
[0014] Furthermore, the edges of adjacent first heat insulation components are fitted together, and the area of the first heat insulation component is larger than the cross-sectional area of the sliding component; wherein, the side length of the first heat insulation component is no greater than 2.5cm, and the thickness is 2cm-3cm.
[0015] Compared with existing technologies, the thermal conductivity testing device provided by this utility model has the following advantages:
[0016] The thermal conductivity testing device provided by this utility model includes a box, a cover plate, a heating component, and a sliding component; the box has a receiving space, the cover plate covers the opening of the box, and the heating component is disposed at the bottom of the receiving space; the sliding component includes a sliding member and a first heat insulation member, the sliding member is located on at least one side wall of the box, and the sliding member can penetrate the side wall of the box and slide relative to the box, the first heat insulation member is correspondingly connected to the sliding member to form at least one clamping surface in a direction parallel to the side wall of the box where the sliding member is located.
[0017] Analysis shows that the enclosure formed by the housing can provide a space for the battery to be carried and tested. The volume of the housing can be adjusted by a sliding member connected to at least one side wall of the housing, and the sliding member in this application can pass through the housing and slide relative to the housing. That is, by moving one end of the sliding member inside the housing towards the side wall where the sliding member is not located, the length or width of the housing can be reduced or increased, thereby clamping the battery placed in the housing.
[0018] Since the sliding component can slide relative to the housing and remain in any position, it can better adapt to the battery size when the battery model changes. Thus, the thermal conductivity of batteries of different models and sizes can be measured using only the testing device provided in this application, without the need to develop multiple products. This improves the overall applicability of the testing fixture and greatly saves testing costs.
[0019] Accordingly, in this application, a first heat insulation component is also connected to one end of the sliding component located inside the housing. The first heat insulation component can, to a certain extent, prevent the heat from being transferred to the sliding component during battery testing, and then from the sliding component to the housing or out of the housing, thus affecting the testing effect.
[0020] In addition, this utility model also provides a testing system, including a thermocouple, a battery, and the above-mentioned thermal conductivity testing device; the thermocouple is attached to the battery, the battery is disposed in the thermal conductivity testing device, and the sliding component abuts against at least one outer wall surface of the battery and is thermally insulated from the battery.
[0021] The thermal conductivity of a battery can be tested by attaching a thermocouple to the battery. The test system using the thermal conductivity testing device provided in this application can quickly locate batteries of different models and sizes. Therefore, it is not necessary to develop a large number of test devices to adapt to the testing of different battery models, and it can quickly locate the battery, thereby improving test efficiency and reducing test costs. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of the housing in the thermal conductivity testing device provided in this embodiment of the utility model;
[0024] Figure 2 This is a schematic diagram of the cover plate in the thermal conductivity testing device provided in this embodiment of the utility model.
[0025] In the diagram: 1-box body; 101-accommodating groove; 2-sliding component; 3-first heat insulation component; 4-heating plate; 5-connecting wire; 6-cover plate; 601-positioning boss; 7-battery. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0027] In the description of the embodiments of this application, 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 utility model product is in use. They are only for the convenience of describing the utility model and 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 the utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0028] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.
[0029] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0031] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device during use or operation.
[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0033] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0034] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have various constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0035] like Figure 1 Combination Figure 2As shown, this utility model provides a thermal conductivity testing device, including a housing 1, a cover plate 6, a heating component, and a sliding component. The housing 1 forms an accommodating space to provide a space for carrying and testing a battery 7. The cover plate 6 covers the opening of the housing 1, and the heating component is disposed at the bottom of the accommodating space. The sliding component includes a sliding member 2 and a first heat insulation member 3. The sliding member 2 is located on at least one side wall of the housing 1, and the sliding member 2 can penetrate the side wall of the housing 1 and slide relative to the side wall of the housing 1, thereby adjusting the volume of the accommodating space of the housing 1. That is, by moving one end of the sliding member 2 inside the housing 1 toward the side wall where the sliding member 2 is not located, the length or width of the housing 1 can be reduced or increased, thereby clamping the battery 7 disposed in the accommodating space. The first heat insulation member 3 is correspondingly connected to the sliding member 2 to form at least one clamping surface along a direction parallel to the side wall of the housing 1 where the sliding member 2 is located.
[0036] Since the slider 2 can slide relative to the side wall of the housing 1 and remain in any position, when the battery 7 model changes, the slider 2 can be used to abut against the battery 7 to better match the size of the battery 7. Thus, the thermal conductivity of batteries 7 of different models and sizes can be measured using only the testing device provided in this application, which improves the overall versatility of the testing fixture, eliminates the need to develop multiple products, and greatly saves testing costs.
[0037] Accordingly, in this application, the sliding member 2 is connected to a first heat insulation member 3 at one end inside the housing 1. The first heat insulation member 3 can, to a certain extent, prevent the heat from being transferred to the sliding member 2 during battery 7 testing, and then from the sliding member 2 to the housing 1 or out of the housing 1, thus affecting the testing effect.
[0038] Optionally, the slider 2 can be a metal slider or a plastic slider, etc. The metal slider is set on all four sides, which has high rigidity and stability, so that it will not be deformed or damaged. At the same time, it reduces wear during the process of the test device adapting to the battery 7, and can maintain stable performance during long-term use, reducing failures and maintenance costs caused by wear.
[0039] Optionally, the thermal insulation performance can be improved when the slider 2 is a plastic slider.
[0040] It should be added here that, such as Figure 1 Combination Figure 2As shown, the cover plate 6 in this application has a positioning boss 601. On the one hand, since the cover plate 6 needs to achieve a certain degree of sealing with the housing 1, the positioning boss 601 allows the edge of the cover plate 6 to fit against the edge of the housing 1. The positioning boss 601 is inserted into the housing 1, achieving horizontal positioning relative to the housing 1, improving installation efficiency. Furthermore, the sealing with the housing 1 prevents heat loss. On the other hand, the positioning boss 601 increases the thickness of the cover plate 6, thereby ensuring its heat insulation effect and improving testing accuracy to a certain extent. The edge of the cover plate 6 can also be fixed to the housing 1 with bolts, achieving vertical positioning.
[0041] Optionally, such as Figure 1 As shown, there are multiple sliding members 2 and multiple first heat insulation members 3, and multiple first heat insulation members 3 are arranged corresponding to sliding members 2. Multiple adjacent sliding members 2 slide to a preset position to form a clamping surface of a set area.
[0042] In this application, the clamping surface with a set area refers to the area where, after the battery 7 is placed in the receiving space, the sliding member 2 drives the first heat insulation member 3 to move towards the battery 7 until the first heat insulation member 3 is in contact with the outer wall of the battery 7. This set area is greater than or equal to the contact area with the battery 7. It is understood that since the heat insulation surface composed of multiple first heat insulation members 3 cannot match the size of all models of battery 7, when it cannot be perfectly matched, the adjustment range can be increased by simultaneously adjusting the sliding members 2 on the opposite side walls. Furthermore, the heat insulation surface needs to be larger than the area of the outer wall of the battery 7 to ensure the heat insulation effect.
[0043] Optionally, such as Figure 1 As shown, the box 1 in this application is rectangular, and sliding parts 2 and first heat insulation parts 3 are provided on two adjacent side walls of the box 1.
[0044] The rectangular housing 1 is more suitable for the square battery 7, and it also makes the setting and movement of the slider 2 simpler.
[0045] In this embodiment, sliding members 2 and first heat insulation members 3 are provided on two adjacent surfaces of the housing 1. During actual operation, the battery 7 can be pushed using the sliding member 2 on one side wall, and together with the parallel side wall on the other side, the battery 7 can be clamped. Then, the sliding member 2 on the other side wall is pushed, moving the battery 7 to a corner inside the housing 1. Thus, the battery 7 is clamped and limited by the sliding members 2 connected to the two adjacent side walls, improving operational efficiency. Optionally, as... Figure 1 As shown in the figure, in this application, the four sides of the box body 1 and the cover plate 6 are preferably provided with sliding parts 2 and first heat insulation parts 3.
[0046] The sliding parts 2 on the four sides of the housing 1 can clamp the battery 7 on the four sides in the circumferential direction, thereby obtaining a tighter barrier space and ensuring the accuracy of the thermal conductivity test of the battery 7.
[0047] Optionally, such as Figure 1 As shown, in this application, the sliding members 2 on two opposite sides of the housing 1 are arranged in a one-to-one correspondence, and the sliding members 2 on the other two opposite sides are arranged in a one-to-one correspondence.
[0048] Since the housing 1 obtained in this application is rectangular, the sliding parts 2 connected to the two parallel sidewalls in this application are all set one-to-one, so as to avoid the problem of different areas of the two contact surfaces caused by the mismatch of the positions of the sliding parts 2 during the sliding operation. In addition, the one-to-one matching sliding parts 2 can provide a certain degree of operation reference during operation, thereby improving work efficiency.
[0049] Optionally, the heating component in this application includes a heating plate 4 and a connecting wire 5. The heating plate 4 is laid at the bottom of the accommodating space, and one end of the connecting wire 5 is connected to the heating plate 4, while the other end extends out of the housing 1 and is connected to an external power source.
[0050] The heating plate 4 can provide heat to the battery 7, thereby enabling the measurement of thermal conductivity. Since the cover plate 6 and the side wall of the box 1 are both equipped with sliding parts 2, by laying the heating plate 4 at the bottom of the box 1, the installation and wiring are more convenient, and the arrangement and installation of other structures are not affected, thus improving the space utilization and regularity of the overall structure.
[0051] Preferably, the bottom of the housing 1 in this application is provided with a second heat insulation component, and the heating plate 4 is disposed on the second heat insulation component; the shape of the second heat insulation component is adapted to the shape of the heating plate 4, and the area of the second heat insulation component is not less than the area of the heating plate 4. The areas of the heating plate 4 and the second heat insulation component are both smaller than the bottom area of the housing 1, so that a receiving groove 101 is formed between the heating plate 4 and the second heat insulation component and the side wall of the housing 1 for accommodating the connecting wire 5.
[0052] To prevent the heat from the heating plate 4 from being transferred to the chamber 1 or outward, this application lays a second heat insulation component at the bottom of the chamber 1, and places the heating plate 4 on the second heat insulation component, thereby separating the heating component from the chamber 1 and ensuring the heating effect and the detection effect.
[0053] Accordingly, in order to avoid the connection line 5 connected to the heating plate 4 causing clutter in the receiving space, this application makes the area of the second heat insulation component smaller than the bottom area of the box 1, so that a receiving groove 101 can be formed between the second heat insulation component and the box 1, and the receiving groove 101 can accommodate the connection line 5, making the wiring layout more reasonable.
[0054] It is understandable that, since the first heat insulation component 3 is connected to the sliding component 2 in this application, and the bottom of the housing 1 is covered with the second heat insulation component and the heating plate 4, this application avoids the problem of interference between the first heat insulation component 3 on the sliding component 2 near the bottom of the housing 1 and the heating plate 4 when the sliding component 2 near the bottom of the housing 1 moves, thus preventing the sliding component 2 from moving and thus failing to fit against the outer wall of the battery 7.
[0055] Preferably, both the first heat insulation component 3 and the second heat insulation component in this application are heat insulation cotton. The side length of the first heat insulation component 3 is no greater than 2.5cm, and the area of the first heat insulation component 3 is greater than the cross-sectional area of the sliding component 2. The edges of adjacent first heat insulation components 3 are fitted together. The thickness of the first heat insulation component 3 is 2cm-3cm. It should be noted that the areas of the first heat insulation component 3 located on the side wall of the housing 1 and the first heat insulation component 3 located on the cover plate 6 can be different. The thickness of the second heat insulation component is greater than the thickness of the first heat insulation component 3, and the thickness of the second heat insulation component is not less than 4cm, thereby ensuring heat insulation and a tight fit to the outer wall of the battery 7.
[0056] In addition, this utility model also provides a testing system, including a thermocouple, a battery 7 and the above-mentioned thermal conductivity testing device; the thermocouple is attached to the battery 7, the battery 7 is disposed in the thermal conductivity testing device, and the first heat insulation member 3 in the thermal conductivity testing device is attached to the outer wall surface of the battery 7.
[0057] The thermal conductivity of battery 7 can be detected by attaching a thermocouple to battery 7. The test system using the thermal conductivity test device provided in this application can quickly locate batteries 7 of different models and sizes. Therefore, it is not necessary to develop a large number of test devices to adapt to the testing of different models of batteries 7, and it can quickly locate batteries 7, thereby improving test efficiency and reducing test costs.
[0058] In the actual implementation of the testing system provided in this application, a battery 7 with a capacity of 50% is first selected, and thermocouples are attached to the center of each end face in the test direction. Then, the corresponding sliding member 2 is pushed according to the size of the battery 7, so that the first heat insulation member 3 connected to the sliding column covers the battery 7 and makes it completely fit the surface of the battery 7. Furthermore, the sliding member 2 can be used to appropriately squeeze the first heat insulation member 3 to make it fit better.
[0059] Finally, the heating plate 4 is connected to a constant current power supply. Since the power output is below 10W, heat generation is slow and takes a long time, while above 20W, heat generation is too rapid and can cause a short time for the temperature difference of battery 7 to stabilize. Therefore, the power supply in this application is set between 10W and 20W. Furthermore, since thermocouples are attached to battery 7, the temperature difference between two monitoring points on battery 7 can be recorded during heating. The heating process stops after the temperature difference stabilizes for approximately 30 minutes, thus completing the test of the thermal conductivity of battery 7.
[0060] It should be noted that, since the electrolyte may decompose and generate additional heat sources when the heating temperature exceeds 90°C, and the gas produced by the decomposition will cause the battery 7 to expand, which will affect the safety of the experiment and the heat insulation effect of the first heat insulation component 3. Therefore, in order to ensure the safety and accuracy of the experiment, the heating temperature of the battery 7 in this application shall not exceed 90°C.
[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A thermal conductivity testing device, characterized by, Includes housing (1), cover plate (6), heating assembly and sliding assembly; The housing (1) forms a receiving space, the cover plate (6) covers the opening of the housing (1), and the heating component is disposed at the bottom of the receiving space; The sliding assembly includes a slider (2) and a first heat insulation member (3). The slider (2) is located on at least one side wall of the housing (1), and the slider (2) can penetrate the side wall of the housing (1) and slide relative to the side wall of the housing (1). The first heat insulation member (3) is correspondingly connected to the slider (2) to form at least one clamping surface along a direction parallel to the side wall of the housing (1) where the slider (2) is located.
2. The thermal conductivity testing apparatus of claim 1, wherein, There are multiple sliding members (2) and multiple first heat insulation members (3), and multiple first heat insulation members (3) are arranged corresponding to the sliding members (2). The multiple adjacent sliding members (2) slide to a preset position to form a clamping surface of a set area.
3. The thermal conductivity testing apparatus of claim 2, wherein, The box (1) is rectangular, and the sliding member and the first heat insulation member are provided on two adjacent side walls of the box (1).
4. The thermal conductivity testing apparatus of claim 1, wherein, The sliding member (2) and the first heat insulation member (3) are provided on all four sides of the box (1) and on the cover plate (6).
5. The thermal conductivity testing apparatus of claim 1, wherein, The sliding parts (2) on two oppositely arranged side walls of the housing (1) are arranged in a one-to-one correspondence, and the sliding parts (2) on the other two oppositely arranged side walls are arranged in a one-to-one correspondence.
6. The thermal conductivity testing apparatus of claim 1, wherein, The heating assembly includes a heating plate (4) and a connecting wire (5). The heating plate (4) is laid at the bottom of the accommodating space. One end of the connecting wire (5) is connected to the heating plate (4), and the other end extends out of the housing (1) and is connected to an external power source.
7. The thermal conductivity testing apparatus of claim 6, wherein, The bottom of the box (1) is covered with a second heat insulation component, and the heating plate (4) is placed on the second heat insulation component; The shape of the second heat insulation component matches the shape of the heating plate (4), and the area of the second heat insulation component is not less than the area of the heating plate (4). The areas of the heating plate (4) and the second heat insulation component are both smaller than the bottom area inside the box (1), so that a receiving groove (101) is formed between the heating plate (4) and the second heat insulation component and the side wall of the box (1) to accommodate the connecting wire (5).
8. The thermal conductivity testing apparatus of claim 7, wherein, The lowest height of the first heat insulation member (3) located on a row of sliding members (2) near the bottom of the housing (1) is greater than the total height of the second heat insulation member and the heating plate (4); The thickness of the second heat insulation component is greater than the thickness of the first heat insulation component (3).
9. The thermal conductivity testing apparatus of any one of claims 1-5, wherein, The edges of adjacent first heat insulation members (3) are in contact with each other, and the area of the first heat insulation member (3) is larger than the cross-sectional area of the sliding member (2); The first heat insulation component (3) has a side length of no more than 2.5cm and a thickness of 2cm-3cm.
10. A test system, characterized by Includes thermocouples, batteries (7) and thermal conductivity testing devices as described in any one of claims 1-9; The thermocouple is attached to the battery (7) which is arranged in the thermal conductivity testing device, and the sliding assembly abuts against at least one outer wall surface of the battery and is in heat isolation connection with the battery.