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Method for testing heat-conducting property of irregular sample

A technology of thermal conductivity and testing method, applied in the direction of material thermal conductivity, material thermal development, etc., can solve problems such as uneven material, irregular shape, etc., achieve the effect of increasing sensitivity, improving the nature of inverse problems, and avoiding multiple solutions

Inactive Publication Date: 2020-06-05
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is: how to test the thermal conductivity of irregular samples with characteristics such as irregular shape and uneven material without destroying the internal structure, and when When there are many unknown variables in the test model, the parameters to be tested can be accurately determined

Method used

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  • Method for testing heat-conducting property of irregular sample
  • Method for testing heat-conducting property of irregular sample
  • Method for testing heat-conducting property of irregular sample

Examples

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Embodiment 1

[0031] In this embodiment, the test object is a cylindrical lithium battery cell with a metal shell, and its structure is as follows: figure 1 As shown, it includes a cylindrical winding core 101 and a cylindrical metal shell 102, both of which can conduct heat transfer on the end surface 103 and the cylindrical surface 104; wherein the end surface 103 generally has a larger air gap, and the equivalent interface contact thermal resistance is larger; the cylindrical The air gap on the surface 104 is smaller, the contact is better, and the equivalent interface contact thermal resistance is smaller. The thermal conductivity of the winding core 101 is described by two parameters, the axial thermal conductivity ka and the radial thermal conductivity kr, the equivalent contact thermal resistance of the winding core 101 and the shell 102 at the end face 103 is described by Ra, and the winding core 101 and the shell 102 are in the cylinder The equivalent thermal contact resistance of ...

Embodiment 2

[0057] In this embodiment, the test object is a square lithium battery cell with a metal shell, and the structure is as follows: Figure 4 As shown, it includes a square winding core 201 and a square metal casing 202; a rectangular coordinate system is established, wherein the X-Y plane is parallel to the pole piece of the winding core, the X axis is parallel to the long side, the Y axis is parallel to the short side, and the Z axis is perpendicular to the pole piece. sheet; the winding core 201 and the shell 202 can conduct heat transfer on six surfaces, and the two contact surfaces 203 perpendicular to the Z axis have a small contact gap, generally no more than tens of microns, and the contact thermal resistance is very small; vertical X The gap between the two contact surfaces 204 of the shaft and the two contact surfaces 205 perpendicular to the Y axis is generally large, reaching more than 0.1 mm, and the contact thermal resistance is relatively large. In thermal design, ...

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Abstract

The invention discloses a method for testing the heat-conducting property of an irregular sample. Heat insulation treatment is carried out on part of the surface of a to-be-tested sample, so that heatexchange between the sample and the external environment can only be carried out through a specific surface, an internal heat transfer path is restrained, and the test is more sensitive to to-be-tested parameters selectively; during testing, theto-be-tested sample is enabled to be in a constant-temperature T0 state, a constant-temperature T1 state with a strong convective heat transfer coefficient on the surface and a surface approximate heat insulation state in sequence, and an unsteady-state heat transfer process of heat exchange between the interior of the to-be-tested sample and the environment is constructed. According to the invention, the stored energy of the to-be-tested sample is used as a heat source or a heat sink, internal and external heat transfer test is realized without damaging the sample, and the heat shielding effect caused by non-uniform sample surface good heat conduction materials can be avoided; and heat insulation measures are taken on part of the surface of the sample, so that the sensitivity of the test on part of variables can be selectively improved and the sensitivity on other variables can be inhibited when multiple variables exist in heat conductionof the sample.

Description

technical field [0001] The invention relates to a method for testing the thermal conductivity of materials, more specifically to a method for testing the thermal conductivity of samples with characteristics such as irregular shapes and uneven structures. Background technique [0002] The thermal conductivity of materials is crucial to thermal design. Accurate testing of thermal conductivity of materials is the basis of system design and the basis of production quality control. The thermal conductivity of materials is generally expressed by thermal conductivity, and in a few cases, it is also characterized by thermal diffusivity parameters. In the case of known density and specific heat capacity, knowing one of the two can calculate the other. For a composite system formed by combining and connecting multiple materials, the contact thermal resistance between different units is also a key parameter affecting thermal conductivity. [0003] There are currently many methods and ...

Claims

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Application Information

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IPC IPC(8): G01N25/18G01N25/20
CPCG01N25/18G01N25/20
Inventor 侯德鑫叶树亮
Owner CHINA JILIANG UNIV
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