A test device and a test system

Abstract

The present application provides a testing device and a testing system, which relate to the technical field of battery performance testing. The testing device is used to measure the thermal conductivity of the battery, and the testing device includes a heating element, a temperature sensing element and a temperature measuring assembly; the heating element is arranged at the geometric center inside the battery; the temperature sensing element is arranged around the heating element; the temperature sensing element is used to measure the temperature of the heating element; the temperature measuring assembly includes a first temperature measuring element and a second temperature measuring element; the first temperature measuring element and the second temperature measuring element are respectively arranged on two opposite surfaces to be tested of the battery; the first temperature measuring element and the second temperature measuring element are used to measure the temperature of the corresponding surfaces to be tested. The testing system includes a testing device. The testing device of the present application can accurately measure the thermal conductivity of the battery.

Description

Technical Field

[0001] The present application relates to the technical field of battery performance testing, and in particular to a testing device and a testing system. Background Art

[0002] Thermal conductivity is a key factor affecting battery heat dissipation. Due to the complexity of the battery, the thermal conductivity of the battery in different directions is different. When designing a battery module, it is usually necessary to consider the thermal conductivity of the battery, so it is very important to understand the thermal conductivity of the battery in different directions.

[0003] The existing technology usually heats one side of the battery and monitors the temperature of the side opposite to the heated surface to calculate the thermal conductivity of the battery; due to the complex internal structure of the battery, the existing heating method cannot accurately reflect the heat generation state of the battery during operation. Therefore, the thermal conductivity obtained using the existing testing device is inaccurate. Utility Model Content

[0004] In order to overcome the deficiencies in the prior art, the present application provides a testing device and a testing system.

[0005] This application provides the following technical solutions:

[0006] In a first aspect, the present application provides a testing device for measuring the thermal conductivity of a battery, the testing device comprising:

[0007] A heating element is disposed at the geometric center of the battery;

[0008] A temperature sensing element is arranged around the heating element; the temperature sensing element is used to measure the temperature of the heating element;

[0009] The temperature measuring component includes a first temperature measuring element and a second temperature measuring element; the first temperature measuring element and the second temperature measuring element are respectively arranged on two opposite surfaces to be measured of the battery; the first temperature measuring element and the second temperature measuring element are used to measure the temperature corresponding to the surfaces to be measured.

[0010] In a possible implementation manner, the testing device further includes a heat insulating member; the heat insulating member covers the remaining surfaces of the battery except the two surfaces to be tested.

[0011] In a possible implementation, the thermal conductivity of the thermal insulation element is less than 0.1 W / (m·K).

[0012] In a possible implementation, the thermal insulation member is any one of a polyurethane foam board, a centrifugal stripped fiber cotton, a micro-nano thermal insulation board, an aerogel felt or a vacuum board.

[0013] In a possible implementation manner, the testing device further includes an anti-corrosion component; the anti-corrosion component is wrapped around the outside of the temperature sensing element.

[0014] In a possible implementation manner, the first temperature measuring element and the second temperature measuring element are symmetrically arranged.

[0015] In a second aspect, the present application also provides a testing system, including a battery and the above-mentioned testing device.

[0016] In a possible implementation manner, the testing device further includes a sealing member; a mounting hole is provided on one side surface of the battery; and the sealing member is sealed at an opening of the mounting hole.

[0017] In a possible implementation manner, the mounting hole is opened on the surface to be tested.

[0018] In a possible implementation manner, the first temperature measuring element or the second temperature measuring element is disposed around the mounting hole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The test device provided in the present application is configured to place a heating element inside the battery so that the heating element can dissipate heat to simulate the heat generation state of the battery during operation. By recording the temperature of the heating element measured by the temperature sensing element, and measuring the temperature of the corresponding surface to be measured by the first temperature measuring element and the second temperature measuring element, the thermal conductivity of the battery can be calculated. Since the heating element is located at the geometric center of the battery, the influence of the internal structure difference of the battery on the thermal conductivity measurement of the battery can be effectively reduced.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a testing device according to a first embodiment of the present application is shown;

[0024] Figure 2 A schematic diagram showing a testing device according to a second embodiment of the present application is shown;

[0025] Figure 3A schematic diagram of a test device according to a third embodiment of the present application is shown;

[0026] Figure 4 A schematic diagram of a testing device according to a fourth embodiment of the present application is shown.

[0027] Description of main component symbols:

[0028] 100-test device; 110-battery; 111-first side; 112-second side; 113-third side; 114-fourth side; 115-fifth side; 116-sixth side; 117-mounting hole; 120-heating element; 130-temperature sensing element; 140-first temperature measuring element; 141-second temperature measuring element; 150-seal;

[0029] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Embodiment 1

[0036] See also Figures 1 to 3 In one embodiment of the present application, a testing device 100 is provided; the testing device 100 is used to measure the thermal conductivity of a battery 110 .

[0037] In this embodiment, the battery 110 tested by the testing device 100 is a square battery. The shape of the battery 110 is roughly a cuboid, and the length direction of the battery 110 is defined as a first direction X, the width direction of the battery 110 is defined as a second direction Y, and the height direction of the battery 110 is defined as a third direction Z.

[0038] The first direction X is perpendicular to the second direction Y, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0039] The two sides of the battery 110 along the first direction X are respectively a first side 111 and a second side 112; the two sides of the battery 110 along the second direction Y are respectively a third side 113 and a fourth side 114; the two sides of the battery 110 along the third direction Z are respectively a fifth side 115 and a sixth side 116.

[0040] It is understandable that the above definitions are only for facilitating the understanding of the relative positional relationship of the various parts in the battery 110 and should not be construed as limiting the present application.

[0041] See also Figures 1 to 3The testing device 100 includes a heating element 120, a temperature sensing element 130 and a temperature measuring component; the heating element 120 is arranged at the geometric center of the battery 110; the temperature sensing element 130 is arranged inside the battery 110 and around the heating element 120; the temperature measuring component includes a first temperature measuring element 140 and a second temperature measuring element 141; the first temperature measuring element 140 and the second temperature measuring element 141 are respectively arranged on two opposite surfaces to be tested of the battery 110.

[0042] The heating element 120 can dissipate heat inside the battery 110. Since the heating element 120 is located at the geometric center inside the battery 110, the heating element 120 can simulate the heat generation state of the battery 110 during operation when dissipating heat, and reduce the impact of the internal structural differences of the battery 110 on the measurement of the thermal conductivity of the battery 110. The temperature sensing element 130 is used to measure the temperature of the heating element 120. The first temperature measuring element 140 and the second temperature measuring element 141 are used to measure the temperature of the corresponding surface to be measured.

[0043] The testing device 100 of this embodiment can calculate the thermal conductivity of the battery 110 along the first direction X, the second direction Y, or the third direction Z by obtaining the temperature of the heating element 120 and the temperature of the surface to be tested using the following formula:

[0044]

[0045] Among them, K is the thermal conductivity of the battery 110; Q is the heating power of the heating element 120; S is the area of ​​the surface to be measured; d is the vertical distance from the heating element 120 to the surface to be measured; T is the temperature of the heating element 120 measured by the temperature sensing element 130; t is the temperature of the corresponding surface to be measured measured by the first temperature measuring element 140, or the temperature of the corresponding surface to be measured measured by the second temperature measuring element 141.

[0046] It is worth noting that the heating power Q of the heating element 120 is constant when it is working. t is the temperature of the surface to be measured when it is stable. T is the temperature measured by the temperature sensing element 130 when the temperature of the surface to be measured is stable. Since the heating element 120 is located at the geometric center inside the battery 110, the value of d is close to the vertical distance from the geometric center inside the battery 110 to the surface to be measured. Since the vertical distances from the two surfaces to be measured to the heating element 120 are the same, under ideal conditions, the temperature of the corresponding surface to be measured measured by the first temperature measuring element 140 is the same as the temperature of the corresponding surface to be measured measured by the second temperature measuring element 141; if the values ​​measured by the two are different and the difference is small, t takes the average value of the two; if the values ​​measured by the two are different, re-measure.

[0047] In some embodiments, see Figure 1 The testing device 100 is used to measure the thermal conductivity of the battery 110 along the first direction X.

[0048] Specifically, the first temperature measuring element 140 is disposed on the first side surface 111 to measure the temperature of the first side surface 111 ; the second temperature measuring element 141 is disposed on the second side surface 112 to measure the temperature of the second side surface 112 .

[0049] The first side surface 111 and the second side surface 112 are surfaces to be measured. When measuring the thermal conductivity in the first direction X, the first side surface 111 and the second side surface 112 cannot be placed on the ground or a workbench.

[0050] The vertical distance between the heating element 120 and the test surface is approximately half the length of the battery 110 .

[0051] When the heating element 120 operates at a certain heating power for a period of time and the battery 110 enters a stable temperature gradient, the temperature measured by the temperature sensing element 130 and the temperatures measured by the first temperature measuring element 140 and the second temperature measuring element 141 are recorded, and then the thermal conductivity of the battery 110 along the first direction X is calculated by a formula.

[0052] It is understandable that the operator can adjust the heating power of the heating element 120 and record various values ​​under the corresponding heating power to improve the accuracy of the testing device 100 in measuring thermal conductivity.

[0053] Exemplarily, the heating element 120 is a heating wire. The temperature sensing element 130 , the first temperature measuring element 140 , and the second temperature measuring element 141 are all thermocouples.

[0054] Exemplarily, the first temperature measuring element 140 or the second temperature measuring element 141 may be fixed to the corresponding surface to be measured by bonding.

[0055] In some embodiments, the testing device 100 further includes a heat insulating member (not shown); the heat insulating member covers the third side 113, the fourth side 114, the fifth side 115 and the sixth side 116 to prevent heat of the battery 110 from being dissipated from surfaces other than the first side 111 and the second side 112.

[0056] Preferably, the thermal conductivity of the thermal insulation element is less than 0.1 W / (m·K).

[0057] Exemplarily, the thermal insulation member is any one of a polyurethane foam board, a centrifugal stripped fiber cotton, a micro-nano insulation board, an aerogel felt or a vacuum board.

[0058] Exemplarily, the heat insulating member is fixed to the corresponding side surface of the battery 110 by bonding.

[0059] In some embodiments, the testing device 100 further includes an anti-corrosion component (not shown); the anti-corrosion component is wrapped around the outside of the temperature sensing element 130 to prevent the electrolyte inside the battery 110 from corroding the temperature sensing element 130 .

[0060] In some embodiments, the first temperature measuring element 140 and the second temperature measuring element 141 are symmetrically arranged so that a value of the temperature of the first side surface 111 measured by the first temperature measuring element 140 is close to a value of the temperature of the second side surface 112 measured by the second temperature measuring element 141 .

[0061] In some embodiments, see Figure 2 The testing device 100 is used to measure the thermal conductivity of the battery 110 along the second direction Y.

[0062] Specifically, the first temperature measuring element 140 is disposed on the third side surface 113 to measure the temperature of the third side surface 113 ; the second temperature measuring element 141 is disposed on the fourth side surface 114 to measure the temperature of the fourth side surface 114 .

[0063] The third side surface 113 and the fourth side surface 114 are the test surfaces. When measuring the thermal conductivity in the second direction Y, the third side surface 113 and the fourth side surface 114 cannot be placed on the ground or a workbench. The vertical distance from the heating element 120 to the test surface is approximately half the width of the battery 110.

[0064] The thermal insulation member covers the first side surface 111 , the second side surface 112 , the fifth side surface 115 , and the sixth side surface 116 .

[0065] In some embodiments, see Figure 3 The testing device 100 is used to measure the thermal conductivity of the battery 110 along the third direction Z.

[0066] Specifically, the first temperature measuring element 140 is disposed on the fifth side surface 115 to measure the temperature of the fifth side surface 115 ; the second temperature measuring element 141 is disposed on the sixth side surface 116 to measure the temperature of the sixth side surface 116 .

[0067] The fifth side surface 115 and the sixth side surface 116 are the test surfaces. When measuring the thermal conductivity in the third direction Z, the fifth side surface 115 and the sixth side surface 116 cannot be placed on the ground or a workbench. The vertical distance from the heating element 120 to the test surface is approximately half the height of the battery 110.

[0068] The thermal insulation member covers the first side surface 111 , the second side surface 112 , the third side surface 113 , and the fourth side surface 114 .

[0069] Embodiment 2

[0070] See also Figure 4 This embodiment provides a testing device 100. The testing device 100 is used to measure the thermal conductivity of a battery 110.

[0071] In this embodiment, the battery 110 tested by the testing device 100 is a cylindrical battery 110. The shape of the battery 110 is substantially cylindrical. The testing device 100 can measure the thermal conductivity of the battery 110 in the axial direction.

[0072] Specifically, the heating element 120 is disposed at the geometric center of the battery 110; the temperature sensing element 130 is disposed around the heating element 120; the first temperature measuring element 140 and the second temperature measuring element 141 are respectively disposed on two end surfaces of the battery 110 along the axial direction. The heat insulating member covers the curved surface of the battery 110.

[0073] Embodiment 3

[0074] See also Figures 1 to 4 The present application also provides a testing system, including a battery 110 and a testing device 100 of any of the above embodiments.

[0075] In some embodiments, the testing device 100 further includes a sealing member 150 ; a mounting hole 117 is opened on one side surface of the battery 110 ; and the sealing member 150 is sealed at the opening of the mounting hole 117 .

[0076] The battery 110 includes a shell and a winding core; the mounting hole 117 is opened on the shell, and the winding core is arranged in the shell.

[0077] The temperature sensing element 130 and the heating element 120 can be placed into the battery 110 through the mounting hole 117; after the temperature sensing element 130 and the heating element 120 are placed into the battery 110, they are subjected to the squeezing force of the winding core, thereby fixing the positions of the temperature sensing element 130 and the heating element 120.

[0078] The sealing member 150 can seal the opening of the mounting hole 117 to prevent the heat inside the battery 110 from being dissipated from the mounting hole 117 .

[0079] Exemplarily, the sealing member 150 is an expansion nail.

[0080] The test system further includes a receiving device, which is electrically connected to the temperature sensing element 130 , the heating element 120 , the first temperature measuring element 140 , and the second temperature measuring element 141 , respectively.

[0081] The receiving device is used to control the heating power of the heating element 120 and receive the values ​​measured by the temperature sensing element 130 , the first temperature measuring element 140 and the second temperature measuring element 141 .

[0082] The wires connecting the temperature sensing element 130 and the heating element 120 with the receiving device pass through the mounting hole 117 .

[0083] In some embodiments, see Figure 3 , the mounting hole 117 is opened on the fifth side surface 115, that is, the mounting hole 117 is opened on the surface to be tested.

[0084] Furthermore, the mounting hole 117 is opened at the center of the fifth side surface 115 ; and the first temperature measuring element 140 is arranged around the mounting hole 117 .

[0085] In another embodiment, the mounting hole 117 is opened on the sixth side surface 116 , and the second temperature measuring element 141 is disposed around the mounting hole 117 .

[0086] In some embodiments, see Figure 1 and Figure 2 The mounting hole 117 is opened on the first side surface 111, and the first temperature measuring element 140 and the second temperature measuring element 141 are not arranged on the surface to be measured, so that the first temperature measuring element 140 and the second temperature measuring element 141 can be arranged at the center of the corresponding surface to be measured.

[0087] In some embodiments, see Figure 4 The mounting hole 117 is opened on one end surface of the cylindrical shell, and the first temperature measuring element 140 is arranged around the mounting hole 117 .

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A testing device, characterized in that: Used to measure the thermal conductivity of a battery, the testing device comprises: A heating element is disposed at the geometric center of the battery; A temperature sensing element is arranged around the heating element; the temperature sensing element is used to measure the temperature of the heating element; The temperature measuring component includes a first temperature measuring element and a second temperature measuring element; the first temperature measuring element and the second temperature measuring element are respectively arranged on two opposite surfaces to be measured of the battery; the first temperature measuring element and the second temperature measuring element are used to measure the temperature corresponding to the surfaces to be measured.

2. The testing device according to claim 1, characterized in that: The testing device further comprises a heat insulating member; the heat insulating member covers the remaining surfaces of the battery except the two surfaces to be tested.

3. The testing device according to claim 2, characterized in that: The thermal conductivity of the thermal insulation member is less than 0.1 W / (m·K).

4. The testing device according to claim 2, characterized in that: The thermal insulation member is any one of a polyurethane foam board, a centrifugal stripping fiber cotton, a micro-nano thermal insulation board, an aerogel felt or a vacuum board.

5. The testing device according to any one of claims 1 to 4, characterized in that: The testing device also includes an anti-corrosion component; the anti-corrosion component is wrapped around the outside of the temperature sensing element.

6. The testing device according to any one of claims 1 to 4, characterized in that: The first temperature measuring element and the second temperature measuring element are symmetrically arranged.

7. A testing system, characterized in that: The invention comprises a battery and the testing device according to any one of claims 1 to 6.

8. The test system according to claim 7, characterized in that: The testing device also includes a sealing member; a mounting hole is opened on one side surface of the battery; and the sealing member is sealed at the opening of the mounting hole.

9. The test system according to claim 8, characterized in that: The mounting hole is arranged on the surface to be tested.

10. The test system according to claim 9, characterized in that: The first temperature measuring element or the second temperature measuring element is arranged around the mounting hole.

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