Flexible film temperature sensing belt

Abstract

The utility model discloses a flexible film temperature sensing belt, which belongs to the technical field of temperature detection and is characterized in that a first temperature sensing unit, a second temperature sensing unit and a third temperature sensing unit are arranged on the flexible film temperature sensing belt, the first temperature sensing unit is respectively connected with the second temperature sensing unit and the third temperature sensing unit, and the second temperature sensing unit is connected with the third temperature sensing unit. The first 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 object to be measured, 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 utility model relates to temperature detection technical field, is especially used for flexible film temperature sensing zone of lithium battery module battery cell temperature detection, especially relates to pack battery group, mobile small -size energy storage electric cabinet's battery cell temperature monitoring. BACKGROUND

[0002] New energy battery is composed of multiple battery packs, and the battery pack contains multiple battery cores, the battery core is an electrochemical device encapsulated in a metal shell, a unit for storing and releasing electric energy, usually composed of a positive electrode, a negative electrode, a separator and an electrolyte. When power output is carried out, the battery core will generate heat, and the heat accumulation cannot be dissipated in time, which will cause short circuit or natural safety accidents.

[0003] The existing battery cell temperature acquisition usually arranges an acquisition circuit board on each battery cell, and detects the voltage and current size; this structure causes the battery thermal management data acquisition harness to be very large, and the use of FFC, FPC, FCC and other flexible circuit boards cannot realize single and full acquisition of the temperature of each battery cell, and the manufacturing cost is high and the maintenance is difficult. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to solve the above technical problems.

[0005] According to the utility model, a flexible film temperature sensing zone is provided, which comprises a flexible base material and a first temperature sensing unit, a second temperature sensing unit and a third temperature sensing unit arranged on the flexible base material,

[0006] The first temperature sensing unit is connected with the second temperature sensing unit and the third temperature sensing unit respectively; the first temperature sensing unit is a unit for sensing the reference temperature, and the second temperature sensing unit and the third temperature sensing unit respectively sense the temperature of the corresponding position of the surface of the object to be measured.

[0007] Preferably, the flexible base material is provided with a signal input end VCC, a signal output end PinA, a signal output end PinB and a signal output end Pin C;

[0008] The first temperature sensing unit comprises a first temperature sensing end and a signal transmission part connected with the end part thereof, the second temperature sensing unit comprises a second temperature sensing end and a signal transmission part connected with the end part thereof, and the third temperature sensing unit comprises a third temperature sensing end and a signal transmission part connected with the end part thereof;

[0009] The signal transmission part of one end of the first temperature sensing end is connected with the signal input end VCC, the signal transmission part of the other end of the first temperature sensing end, the signal transmission part of one end of the second temperature sensing end and the signal transmission part of one end of the third temperature sensing end are connected with the signal output end PinA, the signal transmission part of the other end of the second temperature sensing end is connected with the signal output end PinB, and the signal transmission part of the other end of the third temperature sensing end is connected with the signal output end PinC.

[0010] 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.

[0011] 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 coincides with the projection of the third temperature sensing unit on the flexible substrate.

[0012] Preferably, the flexible thin-film temperature sensing tape further comprises an insulating protective layer, and the insulating protective layer is arranged on the flexible substrate to cover all or part of the signal transmission part corresponding to the signal transmission part.

[0013] Preferably, a silica gel heat-conducting layer is arranged above the insulating protective layer.

[0014] Preferably, a silica gel heat-conducting layer is arranged on the other side of the flexible substrate.

[0015] Preferably, the first temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit are arranged on the flexible substrate by means of patching.

[0016] Preferably, the first temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit are arranged on the flexible substrate by means of printing.

[0017] 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.

[0018] The flexible thin-film temperature sensing tape has the following advantages: compared with the prior art, the first temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit are arranged on the flexible thin-film temperature sensing tape, the first temperature sensing unit is connected with the second temperature sensing unit and the third temperature sensing unit, the first temperature sensing unit serves as a reference temperature sensing unit, the second temperature sensing unit and the third temperature sensing unit sense the temperature of the corresponding positions on the surface of the object to be measured, and the flexible thin-film temperature sensing tape not only has improved flexibility, but also can perform multi-point temperature measurement and cross verification to improve the accuracy of temperature measurement. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a flexible thin film temperature sensing belt involved in the embodiment scheme of the present application;

[0020] Figure 2 is a structural schematic diagram of a temperature sensing unit of a flexible thin film temperature sensing belt involved in the embodiment scheme of the present application;

[0021] Figure 3 is a structural schematic diagram of a flexible thin film temperature sensing belt involved in the embodiment scheme of the present application;

[0022] Figure 4 is a sectional schematic diagram of a flexible thin film temperature sensing belt involved in the embodiment scheme of the present application.

[0023] Reference signs and names:

[0024] 10, flexible thin film temperature sensing belt;

[0025] 11, flexible substrate; 111, VCC pin; 112, Pin A pin; 113, Pin B pin; 114, Pin C pin;

[0026] 12, first temperature sensing unit; 121, first temperature sensing end; 122, signal transmission part;

[0027] 13, second temperature sensing unit; 131, second temperature sensing end; 132, signal transmission part;

[0028] 14, third temperature sensing unit; 141, third temperature sensing end; 142, signal transmission part;

[0029] 15, insulating protective layer;

[0030] 16, silica gel heat conducting layer. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application.

[0032] The present application proposes a flexible thin film temperature sensing belt, which is pasted on a battery cell, and can collect the temperature of all cells of the whole battery pack in real time. Three temperature sensing ends provided on the temperature sensing belt monitor the ambient temperature and the cell temperature of the battery module respectively. The fast heat conduction function of the temperature sensing belt can balance the cell temperature of each battery, prolong the service life of the battery and reduce the failure rate. The flexible circuit board is used to manufacture the temperature sensing sheet with fast heat conduction, and the cost is low.

[0033] Figure 1 An exemplary structure of a flexible thin film temperature sensing belt is shown, which specifically includes:

[0034] The flexible substrate 11,

[0035] and the first temperature sensing unit 12, the second temperature sensing unit 13 and the third temperature sensing unit 14 disposed on the flexible substrate 11, wherein the first temperature sensing unit 12 is connected with the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively.

[0036] 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 of the corresponding position, that is, the first temperature sensing unit 12 senses the temperature of the position area where the first temperature sensing unit is located, the second temperature sensing unit 13 senses the temperature of the position area where the second temperature sensing unit is located, and the third temperature sensing unit 14 senses the temperature of the position 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 resistance temperature sensing, for example, thermal resistance temperature sensing device, thermistor temperature sensing device, preferably NTC thermistor sensor device.

[0037] In the present application, the first temperature sensing unit 12 is connected with the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively, which means that the first temperature sensing unit 12 is connected with the second temperature sensing unit 13, and at the same time, the first temperature sensing unit 12 is connected with the third temperature sensing unit 14.

[0038] In the present application, the first temperature sensing unit 12 is the unit for sensing the reference temperature, and the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively sense the temperature of the corresponding position on the surface of the object to be measured.

[0039] Please refer to Figure 2As an embodiment, the first temperature sensing unit 12 comprises a first temperature sensing end 121 and a signal transmission part 122 connected to the end of the first temperature sensing end 121, the second temperature sensing unit 13 comprises a second temperature sensing end 131 and a signal transmission part 132 connected to the end of the second temperature sensing end 131, and the third temperature sensing unit 14 comprises a third temperature sensing end 141 and a signal transmission part 142 connected to the end of the third temperature sensing end 141; the signal transmission part 122 connected to the end of the first temperature sensing end 121 is connected to the signal transmission part 132 connected to the end of the second temperature sensing end 131 and the signal transmission part 142 connected to the end of the third temperature sensing end 141 to form a common end, and the common end is connected to the PinA pin 112 to form a signal output end PinA of the first temperature sensing unit 12; the other signal transmission part 122 connected to the other end of the first temperature sensing end 121 is connected to the VCC pin 111 to form a signal input end VCC of the first temperature sensing unit 12. The other signal transmission part 132 connected to the other end of the second temperature sensing end 131 is connected to the Pin B pin 113 to form a signal output end Pin B of the second temperature sensing unit 13. The other signal transmission part 142 connected to the other end of the third temperature sensing end 141 is connected to the Pin C pin 114 to form a signal output end Pin C of the third temperature sensing unit 14. The signal input end VCC (VCC pin 111), the signal output end PinA (PinA pin 112), the signal output end Pin B (Pin B pin 113) and the signal output end Pin C (Pin C pin 114) are connected to other devices for signal transmission.

[0040] Please continue to see Figure 2 For example, when the flexible film temperature sensing belt is connected to the corresponding device (such as BMS and collection unit), the device outputs an initial signal (level signal) through the signal input end 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, and the first temperature sensing unit 12 and the third temperature sensing unit 14 respectively, and obtains the final signal at the corresponding signal output end (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.

[0041] Taking an NTC thermistor sensor as an example, 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.

[0042] The resistance value R1 is measured at the PinA pin, the resistance value R2 is measured at the Pin B pin, and the resistance value R3 is measured at the Pin C pin, and the following relationship is obtained:

[0043]

[0044] As can be known, according to the above relationship, R A , R B , R C corresponding resistance values, and then the corresponding temperature information can be obtained. B The difference between R C values can interactively verify the accuracy of temperature sensing. It should be noted that the first temperature sensing unit 12 is 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 judged 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.

[0045] Compared with the prior art, the flexible film temperature sensing tape provided in the present application is provided with a first temperature sensing unit 12, a second temperature sensing unit 13 and a third temperature sensing unit 14. The first temperature sensing unit 12 is connected with the second temperature sensing unit 13 and the third temperature sensing unit 14 respectively. The first temperature sensing unit 12 is a reference temperature sensing unit. The second temperature sensing unit 13 and the third temperature sensing unit 14 respectively sense the temperature of the corresponding positions on the surface of the object to be measured. This arrangement allows the flexible film temperature sensing tape 10 to perform multi-point temperature measurement and cross verification, thereby improving the accuracy of temperature measurement.

[0046] Please refer to Figure 3 It can be understood that a plurality of temperature sensing units can also be provided on the flexible substrate 11, and the temperature sensing units are arranged in groups. Correspondingly, the flexible substrate 11 is provided with pins corresponding to the temperature sensing units. This structure ensures the accuracy of temperature measurement and avoids the problem of large sampling error during setting.

[0047] As a preferred solution, 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. This arrangement ensures the flexibility of the flexible film temperature sensing tape and allows the surface temperature of the objects to be measured on both sides to be sensed. The VCC pin 111 and the Pin A pin 112 are arranged on the same side of the flexible substrate 11 as the first temperature sensing unit 12. The Pin B pin 113 and the Pin C pin 114 are arranged on the same side of the flexible substrate 11 as the second temperature sensing unit 13 and the third temperature sensing unit 14. Arranging corresponding pins on both sides of the flexible substrate can reduce the processing difficulty.

[0048] As a preferred solution, in order to facilitate the signal acquisition of the acquisition device (external device), the signal input end VCC (VCC pin 111), the signal output end Pin A (Pin A pin 112), the signal output end Pin B (Pin B pin 113) and the signal output end Pin C (Pin C pin 114) are arranged on the same side of the flexible substrate. For example, in the above embodiment, the signal output end Pin B (Pin B pin 113) and the signal output end Pin C (Pin C pin 114) are arranged on the same side as the signal input end VCC (VCC pin 111) and the signal output end Pin A (Pin A pin 112) by passing through the via hole.

[0049] 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, improves the stability of temperature acquisition, and reduces measurement error.

[0050] Please refer to Figure 4 , the flexible film temperature sensing tape 10 further comprises an insulating protective layer 15. After the corresponding signal transmission parts 122, 132 and 142 are 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 signal transmission parts 122, 132 and 142. The insulating protective layer 15 has the functions of insulation and heat insulation, which ensures that the signal transmission parts 122, 132 and 142 are not affected by temperature, thereby ensuring the accuracy of the temperature detection result.

[0051] 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 tape 10, and the insulating protective layer 15 should avoid the sensing position area of the first temperature sensing end 121, the second temperature sensing end 131 and the third temperature sensing end 141.

[0052] As a preferred solution, a silica gel heat conducting layer 16 is arranged above the insulating protective layer 15 and / or on the other side of the flexible substrate 11. The silica gel heat conducting 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 heat dissipation and protection of key devices in the flexible film temperature sensing tape 10, prolonging its service life.

[0053] It should be noted that the manner of disposing the temperature sensing units 12, 13 and 14 on the flexible substrate 11 includes a patch manner, a printing manner and other manners. Specifically, the first temperature sensing end 121 is disposed on the flexible substrate 11 by a pasting manner, or is disposed by a printing or sputtering manner mentioned in the reference (Wang Xiajun, Li Yibing, Zhou Jicheng. Thin film temperature sensor sensitive functional film [J]. Materials Review, 2005, (04): 67-70.), which will not be described herein again.

[0054] In order to protect the first temperature sensing end 121, the second temperature sensing end 131 and the third temperature sensing end 141, a waterproof material and an insulating material are coated on the first temperature sensing end 121, the second temperature sensing end 131 and the third temperature sensing end 141, so as to play a waterproof and insulating protection role.

Claims

1. A flexible thin-film temperature sensing strip, characterized in that, The flexible thin-film temperature sensing strip (10) includes a flexible substrate (11) and a first temperature sensing unit (12), a second temperature sensing unit (13), and a third temperature sensing unit (14) disposed 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 at the corresponding position on the surface of the object to be measured.

2. The flexible thin-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 PinB, and a signal output terminal PinC; The first temperature sensing unit (12) includes a first temperature sensing end (121) and a signal transmission part connected to its end; the second temperature sensing unit (13) includes a second temperature sensing end (131) and a signal transmission part connected to its end; and the third temperature sensing unit (14) includes a third temperature sensing end (141) and a signal transmission part connected to its end. The signal transmission section at one end of the first temperature sensing end (121) is connected to the signal input end VCC. The signal transmission section at the other end of the first temperature sensing end (121), the signal transmission section at one end of the second temperature sensing end (131), and the signal transmission section at one end of the third temperature sensing end (141) are connected to the signal output end PinA. The signal transmission section at the other end of the second temperature sensing end (131) is connected to the signal output end Pin B. The signal transmission section at the other end of the third temperature sensing end (141) is connected to the signal output end Pin C.

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

4. The flexible thin-film temperature-sensing strip according to claim 2, characterized in that, The second temperature sensing unit (13) is disposed on one side of the flexible substrate (11), and the third temperature sensing unit (14) is disposed on the other side of the flexible substrate (11). 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 thin-film temperature-sensing strip according to any one of claims 2-4, characterized in that, The flexible thin-film temperature sensing strip (10) also includes an insulating protective layer (15). After the signal transmission part corresponding to the flexible substrate (11) is set on the flexible substrate (11), the insulating protective layer (15) is set on the flexible substrate (11) to cover all or part of the signal transmission part corresponding to the flexible substrate.

6. The flexible thin-film temperature-sensing strip according to claim 5, characterized in that, A silicone thermal conductive layer (16) is disposed above the insulating protective layer (15).

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

8. The flexible thin-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 disposed on the flexible substrate (11) by means of a patch.

9. The flexible thin-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 disposed on the flexible substrate (11) by printing.

10. The flexible thin-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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