Flexible film temperature sensing belt

Abstract

The invention discloses a flexible film temperature sensing belt, and belongs to the technical field of sensors, the flexible film temperature sensing belt is provided with a first temperature sensing unit, a second temperature sensing unit and a third temperature sensing unit, the first temperature sensing unit is respectively connected with the second temperature sensing unit and the third temperature sensing unit, the first temperature sensing unit is used as a reference temperature sensing unit, and the second temperature sensing unit is used as a reference temperature sensing unit. The second temperature sensing unit and the third temperature sensing unit respectively sense the temperature of the corresponding position of the surface of the to-be-measured object, the flexible film temperature sensing belt in the arrangement mode not only improves the flexibility, but also can perform multi-point temperature measurement and cross validation, and improves the temperature measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, in particular to a flexible film temperature sensing strip capable of performing multi-point temperature measurement and cross-verification. Background Art

[0002] In the field of wireless charging and fast charging, the wireless charging coil is usually set on the vertical surface of the battery cell. The wireless charging coil generates heat, which can reach more than 50 degrees, which can cause the battery to bulge and pose a safety hazard.

[0003] New energy batteries consist of multiple battery packs, each containing multiple battery cells. A battery cell is an electrochemical device enclosed in a metal casing, used to store and release electrical energy. It typically consists of a positive electrode, a negative electrode, a separator, and an electrolyte. When the battery cells generate power, they generate heat. If this heat buildup cannot be dissipated quickly, it can lead to safety incidents such as short circuits or natural disasters.

[0004] Existing battery cell temperature collection typically involves placing a collection circuit board on each battery cell and detecting the voltage and current. This structure results in a very large battery thermal management data collection harness. Even using flexible circuit boards such as FFC, FPC, and FCC for implementation and replacement cannot fully collect the temperature of each battery cell, resulting in high manufacturing costs and difficult maintenance.

[0005] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0006] The main purpose of the present invention is to provide a flexible film temperature sensing strip to solve the technical problems of low flexibility, complex wiring harness and inaccurate temperature measurement in the prior art.

[0007] To achieve the above object, the present invention provides a flexible film temperature sensing strip, which includes a flexible substrate and a first temperature sensing unit, a second temperature sensing unit and a third temperature sensing unit arranged on the flexible substrate.

[0008] Among them, the first temperature sensing unit is connected to the second temperature sensing unit and the third temperature sensing unit respectively; the first temperature sensing unit serves as a reference temperature sensing unit, and the second temperature sensing unit and the third temperature sensing unit respectively sense the temperature of corresponding positions on the surface of the object to be measured.

[0009] Preferably, a signal input terminal VCC, a signal output terminal PinA, a signal output terminal PinB, and a signal output terminal Pin C are provided on the flexible substrate;

[0010] The first temperature sensing unit includes a first temperature sensing end and a signal transmission unit connected to the end thereof, the second temperature sensing unit includes a second temperature sensing end and a signal transmission unit connected to the end thereof, and the third temperature sensing unit includes a third temperature sensing end and a signal transmission unit connected to the end thereof;

[0011] The signal transmission portion at one end of the first temperature sensing end is connected to the signal input end VCC, the signal transmission portion at the other end of the first temperature sensing end, the signal transmission portion at one end of the second temperature sensing end, and the signal transmission portion at one end of the third temperature sensing end are connected to the signal output end PinA, the signal transmission portion at the other end of the second temperature sensing end is connected to the signal output end Pin B, and the signal transmission portion at the other end of the third temperature sensing end is connected to the signal output end Pin C.

[0012] Preferably, the first temperature sensing unit is arranged on one side of the flexible substrate, and the second temperature sensing unit and the third temperature sensing unit are arranged on the other side of the flexible substrate.

[0013] Preferably, the second temperature sensing unit is arranged on one side of the flexible substrate, and the third temperature sensing unit is arranged on the other side of the flexible substrate, and the projection of the second temperature sensing unit on the flexible substrate overlaps with the projection of the third temperature sensing unit on the flexible substrate.

[0014] Preferably, the flexible film temperature sensing strip further includes an insulating protective layer. After the corresponding signal transmission part is arranged on the flexible substrate, the insulating protective layer is arranged on the flexible substrate to cover all or part of the corresponding signal transmission part.

[0015] Preferably, a silicone thermal conductive layer is provided above the insulating protective layer.

[0016] Preferably, a silicone heat-conducting layer is provided on the other side of the flexible substrate.

[0017] Preferably, the first temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit are arranged on the flexible substrate in a patch manner.

[0018] Preferably, the first temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit are provided on the flexible substrate by printing.

[0019] Preferably, the first temperature sensing end, the second temperature sensing end and the third temperature sensing end are coated with waterproof material and insulating material.

[0020] The beneficial effect of the flexible thin film temperature sensing strip proposed in the present application is that, compared with the prior art, a first temperature sensing unit, a second temperature sensing unit and a third temperature sensing unit are arranged on the flexible thin film temperature sensing strip, wherein the first temperature sensing unit is connected to the second temperature sensing unit and the third temperature sensing unit respectively, the first temperature sensing unit serves as a unit for sensing the reference temperature, and the second temperature sensing unit and the third temperature sensing unit respectively sense the temperature at the corresponding position on the surface of the object to be measured. This setting method of the flexible thin film temperature sensing strip not only improves its flexibility, but also allows for multi-point temperature measurement and cross-validation, thereby improving the accuracy of temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the flexible film temperature sensing strip involved in the embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of a temperature sensing unit of a flexible film temperature sensing strip according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the structure of the flexible film temperature sensing strip involved in the embodiment of the present invention.

[0024] Figure 4 It is a cross-sectional schematic diagram of the flexible film temperature sensing belt involved in the embodiment of the present invention.

[0025] Figure numbers and names:

[0026] 10. Flexible film temperature sensing zone;

[0027] 11. Flexible substrate; 111. VCC pin; 112. Pin A pin; 113. Pin B pin; 114. Pin C pin;

[0028] 12. First temperature sensing unit; 121. First temperature sensing end; 122. Signal transmission unit;

[0029] 13. Second temperature sensing unit; 131. Second temperature sensing end; 132. Signal transmission unit;

[0030] 14. Third temperature sensing unit; 141. Third temperature sensing end; 142. Signal transmission unit;

[0031] 15. Insulation protective layer;

[0032] 16. Silicone thermal conductive layer.

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0035] The present invention provides a flexible thin film temperature sensing strip for detecting the temperature of a surface of a curved object, avoiding the need for bulky wiring harnesses and solving space-constrained situations, such as battery modules, mobile energy storage power supplies, motor rotor cores, etc. Figure 1 The flexible film temperature sensing zone 10 specifically includes:

[0036] Flexible substrate 11,

[0037] A first temperature sensing unit 12 , a second temperature sensing unit 13 and a third temperature sensing unit 14 are provided on the flexible substrate 11 , wherein the first temperature sensing unit 12 is connected to the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively.

[0038] In the present application, the first temperature sensing unit 12, the second temperature sensing unit 13, and the third temperature sensing unit 14 are used to sense the temperature at corresponding locations. That is, the first temperature sensing unit 12 senses the temperature of the area where the first temperature sensing unit is located, the second temperature sensing unit 13 senses the temperature of the area where the second temperature sensing unit is located, and the third temperature sensing unit 14 senses the temperature of the area where the third temperature sensing unit is located. As an embodiment, in the present application, the first temperature sensing unit 12, the second temperature sensing unit 13, and the third temperature sensing unit 14 adopt the principle of resistive temperature sensing, such as a thermal resistor temperature sensor device or a thermistor temperature sensor device, preferably an NTC thermistor sensor device.

[0039] In the present application, the first temperature sensing unit 12 being connected to the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively means that the first temperature sensing unit 12 is connected to the second temperature sensing unit 13 and the first temperature sensing unit 12 is connected to the third temperature sensing unit 14 at the same time.

[0040] In the present application, the first temperature sensing unit 12 is used as a reference temperature sensing unit, and the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively sense the temperatures of corresponding positions on the surface of the object to be measured.

[0041] See Figure 2As an embodiment, the first temperature sensing unit 12 includes a first temperature sensing end 121 and a signal transmission unit 122 connected to the end thereof, the second temperature sensing unit 13 includes a second temperature sensing end 131 and a signal transmission unit 132 connected to the end thereof, and the third temperature sensing unit 14 includes a third temperature sensing end 141 and a signal transmission unit 142 connected to the end thereof. The first temperature sensing end 121 is connected to the signal transmission unit 132 connected to the end of the second temperature sensing end 131 and the signal transmission unit 142 connected to the end of the third temperature sensing end 141 through the signal transmission unit 122 connected to the end thereof to form a common end. The common end is connected to the PinA pin 112 to form the signal output terminal PinA of the first temperature sensing unit 12. Another signal transmission unit 122 at the end of the first temperature sensing end 121 is connected to the VCC pin 111 to form the signal input terminal VCC of the first temperature sensing unit 12. Another signal transmission unit 132 at the end of the second temperature sensing end 131 is connected to the PinB pin 113 to form the signal output terminal PinB of the second temperature sensing end 13. Another signal transmission portion 142 at the end of the third temperature-sensing terminal 141 is connected to Pin C 114 to form the signal output terminal Pin C of the third temperature-sensing terminal 14. The signal input terminal VCC (VCC pin 111), signal output terminal PinA (PinA pin 112), signal output terminal Pin B (Pin B pin 113), and signal output terminal Pin C (Pin C pin 114) are connected to other devices for signal transmission.

[0042] Please continue to see Figure 2 For example, when the flexible film temperature sensing strip is connected to the corresponding device (such as BMS, acquisition unit), the device outputs an initial signal (level signal) through the signal input terminal VCC. The initial signal passes through the first temperature sensing unit 12, the first temperature sensing unit 12 and the second temperature sensing unit 13, the first temperature sensing unit 12 and the third temperature sensing unit 14 respectively, and obtains the final signal at the corresponding signal output terminal (PinA, Pin B and Pin C). By calculating the final signal and the initial signal, the temperature information corresponding to the first temperature sensing unit 12, the second temperature sensing unit 13 and the third temperature sensing unit 14 can be obtained respectively.

[0043] Take NTC thermistor sensor as an example to illustrate, R A is the resistance value of the first temperature sensing end 121; R B is the resistance value of the second temperature sensing end 131; R C is the resistance value of the third temperature sensing end 141;

[0044] The resistance value R1 is measured at Pin A, the resistance value R2 is measured at Pin B, and the resistance value R3 is measured at Pin C. The following relationship is obtained:

[0045]

[0046] It can be seen that according to the above relationship, R A 、R B 、R C The corresponding resistance value can be used to obtain the corresponding temperature information. B and R C The difference in values can interactively verify the accuracy of temperature sensing. It should be noted that the first temperature sensing unit 12 serves as a reference temperature sensing unit, that is, the temperature sensed by the first temperature sensing end 121 is less than or equal to the temperature sensed by the second temperature sensing end 131 or the temperature sensed by the third temperature sensing end 141. When the temperature sensed by the first temperature sensing end 121 is greater than the temperature sensed by the second temperature sensing end 131 or the temperature sensed by the third temperature sensing end 141, it can be determined that there is a point failure in the first temperature sensing end 121, the second temperature sensing end 131 and the third temperature sensing end 141.

[0047] Compared with the prior art, the flexible film temperature sensing strip provided by the present invention is provided with a first temperature sensing unit 12, a second temperature sensing unit 13 and a third temperature sensing unit 14, wherein the first temperature sensing unit 12 is connected to the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively. The first temperature sensing unit 12 serves as a unit for sensing the reference temperature, and the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively sense the temperature at corresponding positions on the surface of the object to be measured. This setting method allows the flexible film temperature sensing strip 10 to perform multi-point temperature measurement and cross-validation, thereby improving the accuracy of temperature measurement.

[0048] See Figure 3 As will be appreciated, multiple temperature sensing units can be provided on the flexible substrate 11, with the temperature sensing units arranged in groups. Accordingly, pins are provided on the flexible substrate 11 to correspond to the temperature sensing units. This structure ensures accurate temperature measurement and avoids the problem of large sampling errors that may occur during setup.

[0049] As a preferred solution, the first temperature-sensing unit 12 is disposed on one side of the flexible substrate 11, while the second and third temperature-sensing units 13 and 14 are disposed on the other side. This arrangement ensures the flexibility of the flexible thin film temperature-sensing strip while enabling sensing of the surface temperatures of objects on both sides. VCC pin 111 and Pin A pin 112 are disposed on the same side of the flexible substrate 11 as the first temperature-sensing unit 12; Pin B pin 113 and Pin C pin 114 are disposed on the same side of the flexible substrate 11 as the second and third temperature-sensing units 13 and 14. Placing the corresponding pins on both sides of the flexible substrate reduces manufacturing complexity.

[0050] As a preferred solution, to facilitate signal acquisition by the acquisition device (external device), the signal input terminal VCC (VCC pin 111), the signal output terminal PinA (PinA pin 112), the signal output terminal Pin B (Pin B pin 113), and the signal output terminal Pin C (Pin C pin 114) are disposed on the same surface of the flexible substrate. For example, in the above embodiment, the signal output terminal PinB (Pin B pin 113) and the signal output terminal Pin C (Pin C pin 114) pass through vias and are disposed on the same surface as the signal input terminal VCC (VCC pin 111) and the signal output terminal PinA (Pin A pin 112).

[0051] As a preferred solution, the second temperature sensing unit 13 is arranged on one side of the flexible substrate 11, and the third temperature sensing unit 14 is arranged on the other side of the flexible substrate 11. The second temperature sensing unit 13 and the third temperature sensing unit 14 are arranged correspondingly, that is, the projection of the second temperature sensing unit 13 on the flexible substrate 11 coincides with the projection of the third temperature sensing unit 14 on the flexible substrate 11. This structure makes the second temperature sensing unit 13 and the third temperature sensing unit 14 closer, thereby improving the stability of temperature acquisition and reducing measurement errors.

[0052] See Figure 4 The flexible film temperature sensing strip 10 also includes an insulating protective layer 15. After the corresponding signal transmission components 122, 132, and 142 are arranged on the flexible substrate 11, the insulating protective layer 15 is disposed on the flexible substrate 11 to cover all or part of the signal transmission components 122, 132, and 142. The insulating protective layer 15 provides insulation and heat insulation, ensuring that the signal transmission components 122, 132, and 142 are not affected by temperature, thereby ensuring the accuracy of the temperature detection results.

[0053] It should be noted that the first temperature sensing end 121 , the second temperature sensing end 131 and the third temperature sensing end 141 are temperature sensing positions on the flexible film temperature sensing strip 10 , and the insulating protective layer 15 should avoid the sensing position areas of the first temperature sensing end 121 , the second temperature sensing end 131 and the third temperature sensing end 141 .

[0054] As a preferred solution, a silicone thermal conductive layer 16 is provided above the insulating protective layer 15 and / or on the other side of the flexible substrate 11. The silicone thermal conductive layer 16 covers the flexible substrate or the insulating protective layer or the signal transmission part. When the surface temperature of the object to be measured is overheated, it plays a role in dissipating heat and protecting key components in the flexible film temperature sensing strip 10, thereby extending its service life.

[0055] It should be noted that the methods for disposing the temperature sensing units 12, 13, and 14 on the flexible substrate 11 include: patching, printing, and other methods. Specifically, the first temperature sensing end 121 is disposed on the flexible substrate 11 by pasting, or by printing or sputtering as mentioned in the reference (Wang Xiaojun, Li Yibing, Zhou Jicheng. Thin Film Temperature Sensor Sensitive Functional Film [J]. Materials Guide, 2005, (04): 67-70.), which will not be described in detail here.

[0056] To protect the first temperature sensing end 121 , the second temperature sensing end 131 and the third temperature sensing end 141 , waterproof material and insulating material are coated on the first temperature sensing end 121 , the second temperature sensing end 131 and the third temperature sensing end 141 to provide waterproof and insulating protection.

Claims

1. A flexible film temperature sensing strip, characterized in that: The flexible film temperature sensing strip (10) comprises a flexible substrate (11) and a first temperature sensing unit (12), a second temperature sensing unit (13) and a third temperature sensing unit (14) arranged on the flexible substrate (11). The first temperature sensing unit (12) is connected to the second temperature sensing unit (13) and the third temperature sensing unit (14) respectively; the first temperature sensing unit (12) serves as a reference temperature sensing unit, and the second temperature sensing unit (13) and the third temperature sensing unit (14) respectively sense the temperature of corresponding positions on the surface of the object to be measured.

2. The flexible film temperature sensing strip according to claim 1, characterized in that: The flexible substrate (11) is provided with a signal input terminal VCC, a signal output terminal PinA, a signal output terminal Pin B, and a signal output terminal Pin C; The first temperature sensing unit (12) includes a first temperature sensing end (121) and a signal transmission portion connected to the end thereof, the second temperature sensing unit (13) includes a second temperature sensing end (131) and a signal transmission portion connected to the end thereof, and the third temperature sensing unit (14) includes a third temperature sensing end (141) and a signal transmission portion connected to the end thereof; The signal transmission portion at one end of the first temperature sensing end (121) is connected to the signal input end VCC, the signal transmission portion at the other end of the first temperature sensing end (121) and the signal transmission portion at one end of the second temperature sensing end (131) and the signal transmission portion at one end of the third temperature sensing end (141) are connected to the signal output end Pin A, the signal transmission portion at the other end of the second temperature sensing end (131) is connected to the signal output end Pin B, and the signal transmission portion at the other end of the third temperature sensing end (141) is connected to the signal output end Pin C.

3. The flexible film temperature sensing strip according to claim 2, characterized in that: The first temperature sensing unit (12) is arranged on one side of the flexible substrate (11), and the second temperature sensing unit (13) and the third temperature sensing unit (14) are arranged on the other side of the flexible substrate (11).

4. The flexible film temperature sensing strip according to claim 2, characterized in that: The second temperature sensing unit (13) is arranged on one side of the flexible substrate (11), and the third temperature sensing unit (14) is arranged on the other side of the flexible substrate (11), and the projection of the second temperature sensing unit (13) on the flexible substrate (11) coincides with the projection of the third temperature sensing unit (14) on the flexible substrate (11).

5. The flexible film temperature sensing strip according to any one of claims 2 to 4, characterized in that: The flexible film temperature sensing strip (10) further comprises an insulating protective layer (15). After the corresponding signal transmission part is arranged on the flexible substrate (11), the insulating protective layer (15) is arranged on the flexible substrate (11) to cover all or part of the corresponding signal transmission part.

6. The flexible film temperature sensing strip according to claim 5, characterized in that: A silicone heat-conducting layer (16) is provided above the insulating protective layer (15).

7. The flexible film temperature sensing strip according to claim 6, characterized in that: A silicone heat-conducting layer (16) is provided on the other side of the flexible substrate (11).

8. The flexible film temperature sensing strip according to any one of claims 6-7, characterized in that: The first temperature sensing unit (12), the second temperature sensing unit (13) and the third temperature sensing unit (14) are arranged on the flexible substrate (11) in a patch manner.

9. The flexible film temperature sensing strip according to any one of claims 6-7, characterized in that: The first temperature sensing unit (12), the second temperature sensing unit (13) and the third temperature sensing unit (14) are arranged on the flexible substrate (11) by printing.

10. The flexible film temperature sensing strip according to claim 2, characterized in that: The first temperature sensing end (121), the second temperature sensing end (131) and the third temperature sensing end (141) are coated with waterproof material and insulating material.

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