A gasket, measuring device for temperature distribution

Abstract

The application discloses a kind of gasket, temperature distribution measuring device, gasket includes temperature sensing layer, when the temperature of temperature sensing layer rises, resistance value reduces;Resistance layer is provided with two, two resistance layer is respectively connected with temperature sensing layer, when the temperature of resistance layer changes, resistance value is stable;Measurement part is provided with multiple, every two measurement parts are a group, every group of measurement part is located at the opposite side of resistance layer respectively, and the measurement part of every group is located on different resistance layer.The application is that temperature sensing layer is arranged between resistance layer, and the resistance of certain position of temperature sensing layer reduces with the temperature rise of measured object, the temperature and position of overheated point are obtained by measuring the amplitude of resistance reduction and the position of resistance reduction, and the measurement is accurate, and the applicability is strong.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature measurement and monitoring, and in particular to a gasket and a temperature distribution measuring device. BACKGROUND

[0002] Power batteries have been widely used in electric vehicles and energy storage systems. The battery system is composed of a plurality of battery monomers in series and parallel combination, occupying a certain space volume. During use, the battery generates heat and the temperature rises. In order to ensure safety, the temperature of the battery needs to be detected to prevent the temperature from being too high, damaging the battery, and even causing thermal runaway and causing fire accidents.

[0003] The temperature sensor currently used by the battery management system is a point structure, which can only measure the temperature near the point. If a system with a large space volume is to be measured, a large number of temperature sensors need to be arranged in the system, and the signals of each sensor are measured at the same time to determine whether the system has an abnormal condition by using a computer or a digital circuit. The connection of the sensor is very complex, and the material cost and installation cost are very high. Moreover, no matter how many sensors are placed, it is only a point-like local temperature measurement of the system, and there are always many positions that cannot be measured. Moreover, the temperature sensor may fail, causing "missed measurement" or "false measurement". SUMMARY

[0004] To solve at least one of the above technical problems, the present application provides a gasket and a temperature distribution measuring device, which adopts the following technical solutions:

[0005] The present application provides a gasket, comprising: a temperature sensing layer, the resistance value of which decreases when the temperature rises; two resistance layers, which are respectively located on opposite sides of the temperature sensing layer; and a plurality of measuring portions, each two of which form a group, and each group of measuring portions is respectively located on opposite sides of the resistance layer, and the two measuring portions of each group are located on different resistance layers.

[0006] The embodiments of the present application have at least the following beneficial effects: In the present application, the temperature sensing layer is arranged between the resistance layers. When the temperature of the measured object rises, the resistance of the temperature sensing layer at some positions decreases. By measuring the amplitude of the resistance decrease and the positions of the resistance decrease, the temperature and position of the overheating point are obtained, and the measurement is accurate and has strong applicability.

[0007] In some embodiments of the present application, the resistance layer is a carbon film resistor, and the carbon film resistor is coated with an alloy coating.

[0008] In some embodiments of the present application, the gasket further comprises an insulating layer, the insulating layer is capable of conducting heat, two insulating layers are provided, and the two insulating layers are respectively connected with the two resistance layers, and the outer side of the insulating layer is used to contact the measured surface.

[0009] In some embodiments of the present application, the measuring part is a measuring electrode, four measuring electrodes are provided, and the four measuring electrodes are respectively a first measuring electrode, a second measuring electrode, a third measuring electrode and a fourth measuring electrode, the first measuring electrode and the second measuring electrode are respectively located on the left and right opposite edges of the gasket, and the third measuring electrode and the fourth measuring electrode are respectively located on the upper and lower opposite edges of the gasket.

[0010] In some embodiments of the present application, the measuring electrode is a metal sheet or a strip-shaped coating, and the measuring electrode is fixedly connected to the resistance layer.

[0011] In some embodiments of the present application, the gasket is soft, and the gasket can be attached to the measured surface.

[0012] In some embodiments of the present application, the resistance layer and the temperature sensing layer are fixedly connected through hot pressing, and the resistance layer and the insulating layer are fixedly connected through hot pressing.

[0013] The present application provides a temperature distribution measuring device, comprising: an external circuit, the external circuit comprising a power supply, a current meter and a voltage meter; the gasket described above, the gasket being connected with the external circuit; a first switching switch, the first switching switch being used to connect any group of the measuring part to the external circuit, so that the gasket and the external circuit form a closed loop.

[0014] The embodiments of the present application have at least the following beneficial effects: in the present application, the gasket is connected with the external circuit, when the gasket is heated, the resistance in the circuit changes, the current in the circuit is measured by the current meter, the temperature of the overheating point is reflected, the voltage of different elements in the circuit is measured by the voltage meter, the position of the overheating point is obtained, the measurement is accurate, and the structure is simple.

[0015] In some embodiments of the present application, the external circuit and the gasket are connected through a wire, one end of the wire is connected to the measuring part, and the other end of the wire is connected to the first switching switch.

[0016] In some embodiments of the present application, the temperature distribution measuring device further comprises a second switching switch, one end of the second switching switch is connected with the voltage meter, and the other end of the second switching switch is connected with the gasket, and the second switching switch is used to connect the voltage meter and the to-be-measured element in parallel.

[0017] In some embodiments of the present application, the external circuit further comprises a first switch, which is used to connect any one of the measuring units to the external circuit, so that the gasket and the external circuit form a closed loop.

[0018] Additional aspects and advantages of the present application will be made apparent from the following description, which, taken together with the accompanying drawings, describes an embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic diagram of a gasket according to the present application;

[0021] Figure 2 is a schematic diagram of the internal structure of a gasket according to the present application;

[0022] Figure 3 is a top view of a gasket according to the present application;

[0023] Figure 4 is a cross-sectional view of a gasket A-A according to the present application;

[0024] Figure 5 is an equivalent circuit diagram of a temperature distribution measuring device according to the present application.

[0025] Reference signs: 1, temperature sensing layer; 2, resistance layer; 3, insulation layer; 4, second measuring electrode; 5, power supply; 6, ammeter; 7, voltmeter; 8, first switch; 9, fourth measuring electrode; 10, first measuring electrode; 11, third measuring electrode; 12, fourth equivalent resistance; 13, second equivalent resistance; 14, first equivalent resistance; 15, third equivalent resistance; 16, second switch; 17, first node; 18, second node; 19, third node; 20, fourth node. DETAILED DESCRIPTION

[0026] This section will be combined Figures 1 to 5 Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example an embodiment of the present application. The same or similar components are denoted by the same or similar reference signs throughout the drawings. The embodiments described below are examples only, and are not intended to limit the present application.

[0027] In the description of the present application, it needs to be understood that if the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The features defined as "first", "second" are used to distinguish the feature names, not to have special meanings, and in addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0028] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The embodiment of the present application provides a gasket, which comprises a temperature sensing layer 1, a resistance layer 2 and a measuring part. When the temperature of the temperature sensing layer 1 rises, the resistance decreases. When the temperature of a certain part of the object to be measured rises, the temperature of the corresponding position of the temperature sensing layer 1 rises, and the resistance value becomes low. Specifically, the resistance of the temperature sensing layer 1 at normal temperature is controlled to be between 1k and 10k ohms, and the negative temperature coefficient is between-2% and-6.5%.

[0030] The arrangement of the temperature sensing layer 1 avoids the existing temperature measurement system composed of "point-like multi-temperature sensors", which can effectively improve the reliability of the system and avoid missed measurement or false measurement.

[0031] When the object to be measured is a battery system, since the battery system is composed of a plurality of batteries in series and parallel, a plurality of batteries form a larger area range. In the use process, it is necessary to accurately measure a certain point of overheating to ensure that the user has a clear understanding of the possible fault position of the battery system, so as to improve the safety and reliability of the battery system.

[0032] Specifically, the temperature sensing layer 1 has a certain measurement area, which is greater than or equal to the area to be measured, so as to avoid missing the overheated point of the object to be measured. The temperature of the overheated point and the specific position of the overheated point on the surface of the object to be measured can be obtained through the change of the resistance of the temperature sensing layer 1.

[0033] The resistance layer 2 is provided with two, and the two resistance layers 2 are respectively connected with the opposite two surfaces of the temperature sensing layer 1. During the use of the gasket, the heat needs to be fully transmitted to the temperature sensing layer 1 to change the resistance value of the temperature sensing layer 1, and then the measurement is completed, so the heat can smoothly pass through the resistance layer 2, and the resistance layer 2 can conduct heat.

[0034] The temperature change has little effect on the resistance value of the resistance layer 2. When the temperature sensing layer 1 is connected to the circuit alone, the resistance value in the circuit changes due to the temperature change of the object to be measured, and then the current in the circuit changes. The observation of the current value can indirectly reflect the resistance value of the highest temperature part of the temperature sensing layer 1, and the temperature value of the overheated part of the object to be measured can be obtained through the material performance of the temperature sensing layer 1.

[0035] When the resistance layer 2 is provided, the circuit is expanded from the original one resistance element of the temperature sensing layer 1 to a circuit with multiple resistance elements in series. Since the overheated position of the object to be measured can exist anywhere on the object to be measured, the position where the large current flows through the temperature sensing layer 1 is different, and then the resistance in the circuit connected to the gasket changes, and finally the specific position of the overheated part of the object to be measured in the two-dimensional plane is indirectly measured through the elements connected to the circuit.

[0036] In some examples, the resistance layer 2 is a carbon film resistor, and the carbon film resistor is coated with an alloy coating. Under the premise of ensuring electrical conductivity, the heat conduction performance is good, and the resistance is not easy to change during the heating process. Specifically, the total resistance of the two resistance layers 2 is controlled to be between 5000 and 50000 ohms. When the temperature and specific position of the overheated point of the object to be measured are obtained through the circuit parameters, the specific material and resistance value of the resistance layer need to be converted accordingly.

[0037] In some examples, the gasket is provided with multiple measurement parts, and the temperature sensing layer 1 and the resistance layer 2 in the gasket can be connected to the corresponding circuit through the connection of the measurement parts. Specifically, each two measurement parts form a group, and each group of measurement parts is respectively located on the opposite edges of the resistance layer 2, so that the current can flow through the whole gasket to form a loop when connected to the circuit. The two measurement parts of each group are located on different resistance layers 2, so that the two resistance layers 2 can be connected in series to the circuit, which is convenient for determining the position of the overheated point.

[0038] Specifically, the measurement part has high electrical conductivity, which can make the current flow smoothly. The measurement part is a metal sheet, and the metal sheet is fixedly connected with the resistance layer 2. The lead wire is fixed on the metal sheet by welding. Alternatively, the measurement part is a strip-shaped coating, and the coating is arranged on the edge of the resistance layer 2.

[0039] In some examples, the gasket is rectangular, the temperature sensing layer 1 and the resistance layer 2 are also rectangular, and the measuring electrodes are measuring electrodes for measuring the specific position of the overheating point of the object to be measured, at least two groups of measuring electrodes are arranged to form two current flow directions in two-dimensional space.

[0040] Specifically, the measuring electrodes are four, namely the first measuring electrode, the second measuring electrode, the third measuring electrode and the fourth measuring electrode, the first measuring electrode and the second measuring electrode form a group, the third measuring electrode and the fourth measuring electrode form a group, the first measuring electrode 10 and the second measuring electrode 4 are respectively located on the left and right opposite edges of the gasket, and the first measuring electrode is located on the top resistance layer 2, and the second measuring electrode is located on the bottom resistance layer 2; the third measuring electrode 11 and the fourth measuring electrode 9 are respectively located on the upper and lower opposite edges of the gasket, and the third measuring electrode 11 is located on the top resistance layer 2, and the fourth measuring electrode 9 is located on the bottom resistance layer. After the circuit is connected, the specific position of the overheating point in two directions is obtained through the voltage division principle of the series circuit, and then the positions in two directions are integrated to obtain the position of the overheating point in two-dimensional space.

[0041] In some examples, the gasket is circular, the temperature sensing layer 1 and the resistance layer 2 are also circular, the measuring electrodes are located at the edge position of the resistance layer 2, and the two measuring electrodes of each group are located on different resistance layers 2, respectively, and the two measuring electrodes of each group are located on opposite sides of the circumference.

[0042] In some examples, the gasket includes an insulating layer 3, and the insulating layer 3 is provided with two, one insulating layer 3 is connected outside each resistance layer 2, and the gasket is attached to the object to be measured through the insulating layer 3. The heat emitted by the object to be measured needs to be transmitted to the temperature sensing layer 1 through the insulating layer 3 and the resistance layer 2, so the insulating layer 3 can conduct heat.

[0043] One side of the insulating layer 3 is connected with the resistance layer 2, and the other side is in contact with the surface of the object to be measured. The insulating layer 3 is electrically insulated, and the two insulating layers 3 cover the conductive resistance layer 2 and the temperature sensing layer 1 within the range of the insulating layer 3, so as to avoid accidental loss of electric energy through conductive materials after the gasket is connected to the circuit, affecting the measurement accuracy. The setting of the insulating layer 3 also improves the safety, preventing the user from being electrocuted by accidentally touching the gasket. At the same time, when the measuring gasket is used to measure the temperature of the battery system, the measuring current in the gasket is avoided to affect the normal work of the battery system.

[0044] In some examples, since the surface to be measured of the object to be measured can be a flat plane or an irregular complex curved surface, the gasket is soft, and the soft gasket can be fully attached to various different measured object surfaces, avoiding missed detection and inaccurate measurement.

[0045] Specifically, the gasket needs to be firmly fixed on the surface of the object to be measured, the insulating layer 3 is pasted on the surface of the object to be measured by adhesive, or a fixing belt is arranged on the gasket to fix the gasket on the surface of the object to be measured.

[0046] In some examples, the resistance layer 2 and the temperature sensing layer 1 are fixedly connected by thermal pressing, and the resistance layer 2 and the insulating layer 3 are fixedly connected by thermal pressing. Alternatively, the resistance layer 2 and the temperature sensing layer 1 and the resistance layer 2 and the insulating layer 3 are fixedly connected by adhesive.

[0047] The embodiment of the present application provides a temperature distribution measuring device, which comprises an external circuit, a gasket and a first switch 8. The external circuit comprises a power supply 5, a current meter 6 and a voltage meter 7. The gasket is connected to the external circuit. The temperature distribution measuring device measures the overheating point by parameters measured in the external circuit. The power supply 5 supplies power to the circuit. When the measuring part is provided with two groups, two different series circuits can be formed by connecting different groups of measuring parts, i.e. the resistance layer 2 is divided into two parts in the direction of the same group of measuring part connecting lines by the overheating point of the object to be measured. It can be understood that, since the measuring part is provided with two groups, when there is one overheating point, each resistance layer 2 has different resistance value division modes along two current flow directions.

[0048] When the object to be measured has an overheating point, the first measuring electrode 10 and the second measuring electrode 4 are connected to the circuit or the third measuring electrode 11 and the fourth measuring electrode 9 are connected to the circuit by adjusting the first switch 8, so as to complete the measurement of the temperature and position of the overheating point. Specifically, when the measuring part is provided with two groups, the first switch 8 has two adjustment positions, and the first switch 8 connects different groups of measuring parts to the external circuit at different adjustment positions.

[0049] Specifically, when the first measuring electrode 10 on the left side of the gasket and the second measuring electrode 4 on the right side of the gasket are connected to the circuit, the first equivalent resistance 14 and the second equivalent resistance 13 are connected to the circuit to form a series circuit. When the third measuring electrode 11 on the upper side of the gasket and the fourth measuring electrode 9 on the lower side of the gasket are connected to the circuit, the third equivalent resistance 15 and the fourth equivalent resistance 12 are connected to the circuit to form a series circuit.

[0050] In use, the external circuit and the gasket form a closed loop. The current meter 6 in the external circuit measures the current in different series circuits, and the temperature of the overheating point of the object to be measured is obtained by the current value and the material properties of the temperature sensing layer 1. The position of the overheating point of the object to be measured along the current direction is obtained by the voltage measured by the voltage meter 7 and the voltage division principle of the series circuit.

[0051] In some examples, the measuring part is provided with wires, the wires are fixedly connected with the measuring part, in order to facilitate the gasket to be connected to the measuring circuit, the wires are led out on the gasket, and the number of the wires is same as the number of the measuring parts.

[0052] In some examples, the external circuit includes a second switch 16, when the first switch 8 is in different adjustment positions, different circuits are formed, and different elements in the different circuits need to be measured for voltage. By adjusting the second switch 16, the voltmeter 7 is connected in parallel to the element to be measured in the different series circuits, the voltage measurement is performed, the voltage division in the different series circuits is detected, and finally the specific position of the overheating point in the two-dimensional plane is obtained.

[0053] Specifically, the second switch 16 can be connected to four nodes, a first node 17, a second node 18, a third node 19, and a fourth node 20, the first node 17 is connected to the third measuring electrode 11, the second node 18 is connected to the fourth measuring electrode 9, the third node 19 is connected to the first measuring electrode 10, and the fourth node 20 is connected to the second measuring electrode 4. When the first equivalent resistance 14 and the second equivalent resistance 13 are connected to the series circuit, the current flows from the left side of the resistance network on the top layer to the right side of the resistance network on the bottom layer through the middle temperature coefficient resistance film layer, and the current size is changed by the resistance size of the middle temperature coefficient resistance film layer, and the highest temperature value of the gasket can be calculated by measuring the current. At the same time, by connecting the second switch 16 to the first node 17 and the second node 18 respectively, the voltages of the third measuring electrode 11 and the fourth measuring electrode 9 are measured, and the position of the highest temperature point in the horizontal direction can be calculated according to the voltage division principle of the series resistance.

[0054] Similarly, when the third equivalent resistance 15 and the fourth equivalent resistance 12 are connected to the circuit, the corresponding current is measured, and the highest temperature value is calculated again. At the same time, by connecting the second switch 16 to the third node 19 and the fourth node 20 respectively, the voltages of the first measuring electrode 10 and the second measuring electrode 4 are measured, and the position of the highest temperature point in the vertical direction can be calculated according to the voltage division principle of the series resistance. The ammeter and the voltmeter are converted into digital signals through an analog-to-digital conversion circuit, and an alarm signal and a digital signal are sent to a monitoring system through a digital logic control circuit.

[0055] In the description of the present specification, if the description of the terms "one embodiment", "some examples", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" etc. appears, it means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The embodiments of the present application described above in detail with reference to the accompanying drawings are merely illustrative, and the present application is not limited to the above-described embodiments, but various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A gasket, characterized by, The gasket comprises: a temperature sensing layer (1) whose resistance value decreases when its temperature rises; two resistance layers (2) respectively located on opposite sides of the temperature sensing layer (1); a plurality of measuring units, each two of which form a group, each group of measuring units is respectively located on opposite sides of the resistance layer (2), and two measuring units of each group are located on different resistance layers (2); the measuring units are measuring electrodes, which comprise four first, second, third and fourth measuring electrodes (10, 4, 11, 9) respectively located on left, right, upper and lower opposite sides of the gasket; an external circuit comprising a power supply (5), an ammeter (6), a voltmeter (7), a first switch (8) and a second switch (16); wherein the first switch (8) is used to connect any group of measuring units to the external circuit, so that the gasket and the external circuit form a closed loop; one end of the second switch (16) is connected to the voltmeter (7), and the other end is connected to the gasket, and the second switch (16) is used to connect the voltmeter (7) in parallel with the element to be measured; when the first measuring electrode (10) on the left side of the gasket and the second measuring electrode (4) on the right side of the gasket are connected to the circuit, the first and second equivalent resistances (14, 13) are connected to the circuit to form a series circuit; when the third measuring electrode (11) on the upper side of the gasket and the fourth measuring electrode (9) on the lower side of the gasket are connected to the circuit, the third and fourth equivalent resistances (15, 12) are connected to the circuit to form a series circuit.

2. The gasket of claim 1, wherein The resistance layer is a carbon film resistor coated with an alloy coating.

3. The gasket of claim 1, wherein The gasket further comprises an insulating layer (3) capable of conducting heat, which is connected to the two resistance layers (2) and used to contact the surface to be measured.

4. The gasket of claim 1, wherein The measuring electrodes are metal sheets or strip-shaped coatings fixedly connected to the resistance layers (2).

5. The gasket of claim 3, wherein The gasket is soft and can be attached to the surface to be measured.

6. The gasket of claim 3 wherein, The resistance layers (2) and the temperature sensing layer (1) are fixedly connected by hot pressing, and the resistance layers (2) and the insulating layer (3) are fixedly connected by hot pressing.

7. A temperature distribution measuring device, characterized by The gasket of any one of claims 1 to 6 is connected to the external circuit. The external circuit and the gasket are connected by wires, one end of which is connected to the measuring units and the other end is connected to the first switch (8).

8. A temperature distribution measuring device according to claim 7, characterized in that ​

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