A battery internal temperature and pressure wireless monitoring device and battery

Abstract

This invention discloses a wireless temperature and pressure monitoring device and battery for the internal environment of a battery. The device includes a Mylar membrane integrated sensor and a tag. The tag is connected to the Mylar membrane integrated sensor, which comprises a Mylar membrane covering the battery cell. Temperature and pressure sensing elements are integrated on the surface of the Mylar membrane for real-time monitoring of the internal temperature and pressure of the battery. The tag is used to collect sensor signals and transmit the data to a reader. This invention can be directly integrated into the battery for real-time monitoring of internal temperature and pressure. It is highly compatible with the original battery design, can operate stably under high temperature and high pressure conditions inside the battery without affecting battery function, and can withstand the expansion and contraction of the battery during charging and discharging, ensuring the long-term stability of the sensor.

Description

Technical Field

[0001] This invention relates to the field of battery internal testing technology, specifically to a wireless monitoring device for battery internal temperature and pressure and a battery. Background Technology

[0002] With the widespread adoption of lithium-ion batteries in various applications, especially in electric vehicles, energy storage systems, and portable electronic devices, battery safety and reliability have become increasingly important. Changes in the internal temperature and pressure of a battery are early signs of performance degradation, overheating, and even thermal runaway. Therefore, real-time monitoring of the internal temperature and pressure of a battery is crucial for preventing battery failures and improving battery safety.

[0003] Existing battery monitoring technologies primarily rely on external monitoring, using external sensors to monitor parameters such as temperature, pressure, and voltage. The basic principle is to collect temperature and voltage data from the battery surface using external sensors, transmitting the data via wired or wireless means to external devices for analysis and processing. However, external monitoring only reflects the external temperature and voltage of the battery and cannot provide a true picture of the battery's internal state. Furthermore, the arrangement of external sensors and cables can increase battery size, reduce energy density, and potentially affect battery reliability.

[0004] Integrating sensors inside the battery presents significant challenges for signal transmission. Traditional wired transmission solutions typically require cables to transmit sensor data to external devices. This not only compromises the battery's seal but can also lead to leaks of internal gas or electrolyte, reducing battery safety and reliability. While traditional wireless transmission technologies avoid the problems associated with wired transmission, they still present significant technical difficulties when used inside batteries. The battery's metal casing generates a strong electromagnetic shielding effect, making it difficult for radio frequency signals to penetrate, severely impacting signal transmission and data reliability. This electromagnetic shielding effect renders traditional wireless transmission technologies ineffective, hindering stable signal transmission between the battery and external devices, thus limiting the application and performance of internal sensor systems. Summary of the Invention

[0005] The purpose of this invention is to provide a wireless temperature and pressure monitoring device and battery that can be directly integrated inside the battery to monitor the temperature and pressure inside the battery in real time. It is highly compatible with the original design of the battery, can work stably in the high temperature and high pressure environment inside the battery without affecting the battery function, and can withstand the expansion and contraction of the battery during charging and discharging, ensuring the long-term stability of the sensor.

[0006] The technical solution adopted in this invention is: A wireless temperature and pressure monitoring device for a battery includes a Mylar membrane integrated sensor and a tag. The tag is connected to the Mylar membrane integrated sensor. The Mylar membrane integrated sensor includes a Mylar membrane covering the battery cell. The surface of the Mylar membrane is integrated with a temperature sensing element and a pressure sensing element for real-time monitoring of the temperature and pressure inside the battery. The tag is used to collect sensor signals and transmit the data to a reader. The reader is used to actively transmit radio frequency signals (i.e., radio frequency energy and commands) and receive data returned by the tag.

[0007] Preferably, an antenna is provided at the electrode insulation layer of the battery end cap, and the tag end is connected to the reader end through the antenna; The antenna is an RFID antenna, which is an integrated site design, and the reader / writer end is an RFID reader / writer end.

[0008] Preferably, the tag includes a radio frequency energy harvesting and communication module, a microcontroller unit, and a power management module disposed inside the battery. The microcontroller unit is connected to the radio frequency energy harvesting and communication module and the power management module, respectively. The radio frequency energy harvesting and communication module is signal-connected to the reader end through the antenna, and is used to receive the radio frequency signal transmitted by the reader end, convert it into DC power, and transmit the collected data to the reader end. The microcontroller unit is connected to the Mylar membrane integrated sensor.

[0009] Preferably, the Mylar membrane integrated sensor comprises a first polyester film, an elastic conductive film, and a second polyester film arranged in sequence. A sensing circuit formed by conductive silver paste is arranged on the surface of the first polyester film. A temperature sensing part and a pressure sensing part are disposed in the sensing circuit. The sensing circuit is attached to the surface of the first polyester film, and the pressure sensing part forms an ohmic contact with the elastic conductive film.

[0010] Preferably, the elastic conductive film is made of a composite of a fiber skeleton material and a conductive filler.

[0011] Preferably, the pressure sensing part is composed of interdigitated electrodes prepared by screen printing process. When the interdigitated electrodes come into contact with the elastic conductive film, a variable resistance structure is formed. The resistance value of the variable resistance structure changes with the contact pressure. Except for the pressure sensing part, all other parts of the sensing circuit are covered with an insulating protective layer.

[0012] Preferably, the fiber skeleton material in the elastic conductive film includes one or any combination of glass fiber, cotton fiber, polyurethane fiber and aramid fiber; The conductive filler is a composite of NTC nanomaterials and PTC nanomaterials.

[0013] Preferably, the temperature sensing element is formed by photolithography and is made of platinum metal. The platinum metal is formed in a Peano curve fractal structure.

[0014] Preferably, the fabrication of the Mylar membrane integrated sensor includes the following steps: Step S1: Select two polyester films as the first polyester film and the second polyester film respectively, and remove residual impurities from the surface of the polyester films; Step S2: A layer of photoresist is uniformly coated on the surface of the first polyester film. The platinum metal circuit pattern of the temperature sensing part is defined by photolithography. After exposure and development, a platinum metal layer is deposited in a vacuum evaporation system and then stripped to form a platinum resistor with a Peano curve fractal structure as the temperature sensing part. Step S3: Using screen printing technology, conductive silver paste is printed on the surface of the first polyester film on which platinum resistance is formed according to the designed pattern to form a sensing circuit and interdigitated electrodes. The interdigitated electrodes serve as pressure sensing parts, and an insulating protective layer is covered on the non-pressure sensing parts. Step S4: The composite conductive filler and binder are added to an organic solvent to disperse and form a uniform conductive slurry. The fiber skeleton material is impregnated in the conductive slurry. After multiple impregnations and drying, an elastic conductive film with a three-dimensional conductive network structure is obtained. Step S5: Place the elastic conductive film between the first polyester film and the second polyester film, and heat-seal the polyester film around its perimeter to achieve a three-layer sealed encapsulation.

[0015] A battery includes a battery cell, a battery casing, and a wireless temperature and pressure monitoring device for the battery interior as described above. The Mylar membrane of the Mylar membrane integrated sensor is wrapped around the battery cell. The wrapped battery cell and the Mylar membrane integrated sensor are disposed inside the battery casing, and a tag is disposed between the battery cell and the battery casing. The beneficial effects of this invention are: 1. This invention utilizes a Mylar membrane integrated sensor, which is coated onto the battery cell, to achieve real-time monitoring directly inside the battery. Specifically, it monitors the internal temperature and pressure of the battery in real time through temperature and pressure sensors, respectively. The Mylar membrane serves as both the sensor substrate and encapsulation layer. The Mylar membrane is not only an inherent material within the battery but also an integral part of its structure. The Mylar membrane integrated sensor does not alter the battery's internal structure. Due to the high compatibility between the Mylar membrane and the original battery design, seamless integration is achieved, avoiding compatibility issues and structural complexity caused by external materials. Furthermore, the Mylar membrane possesses excellent electrical insulation, chemical stability, and thermal stability, enabling stable operation under high temperature and high pressure conditions inside the battery without affecting battery function. Simultaneously, the flexibility and adaptability of the Mylar membrane allow it to withstand the expansion and contraction of the battery during charging and discharging, ensuring the long-term stability of the sensor. This addresses the issues of data lag and bias present in existing lithium battery monitoring sensors.

[0016] 2. By integrating the antenna into the insulating layer of the battery end cap, the electromagnetic shielding effect of the battery casing's metal material is avoided, ensuring stable wireless signal transmission and overcoming the limitations of traditional wireless transmission technologies applied within battery metal casings. The device, through its radio frequency energy harvesting and communication module, eliminates the need for a built-in battery, significantly extending the monitoring system's lifespan and avoiding the maintenance issues associated with traditional battery power. Attached Figure Description

[0017] Figure 1 This is an exploded schematic diagram of the wireless temperature and pressure monitoring device inside the battery in an embodiment of the present invention.

[0018] Figure 2 This is a temperature test diagram of the temperature sensing unit in an embodiment of the present invention.

[0019] Figure 3 This is a pressure test diagram of the pressure sensing unit in an embodiment of the present invention.

[0020] Figure 4 This is a system architecture diagram of the wireless temperature and pressure monitoring device inside the battery in an embodiment of the present invention.

[0021] In the diagram: 1-Mylar membrane integrated sensor, 2-Pressure sensor, 3-Temperature sensor, 4-Reader, 5-RFID antenna, 6-Data acquisition circuit board, 7-Battery casing, 8-Battery end cap. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0025] Example 1 A wireless monitoring device for internal temperature and pressure of a battery, such as Figures 1-4 As shown, the device includes a Mylar membrane integrated sensor 1 and a tag end, with the tag end connected to the Mylar membrane integrated sensor 1. The Mylar membrane integrated sensor 1 includes a Mylar membrane covering the battery cell, on which temperature and pressure sensors are integrated for real-time monitoring of the temperature and pressure inside the battery. The tag end is used to collect sensor signals and transmit the data to an external reader / writer. An antenna is provided at the electrode insulation layer of the battery end cap, and the tag end is connected to the reader / writer via the antenna. The reader / writer is used to actively transmit radio frequency signals (i.e., radio frequency energy and commands) and receive data returned by the tag end.

[0026] Furthermore, the tag terminal includes an RF energy harvesting and communication module, a microcontroller unit, and a power management module. These modules are all housed within the lithium-ion battery. The microcontroller unit is connected to both the RF energy harvesting and communication module and the power management module. The RF energy harvesting and communication module is connected to the reader terminal via the RFID antenna. It receives RF signals (i.e., RF signals include RF energy and commands) emitted by the reader terminal and converts them into DC power to supply power to other modules on the tag terminal. It can also transmit the collected data to the reader terminal. The microcontroller unit is connected to the Mylar membrane integrated sensor 1. Specifically, the battery cell is housed within the battery casing, and a battery end cap is provided on the battery casing. The RF energy harvesting and communication module, the microcontroller unit, and the power management module are located between the battery cell and the battery end cap.

[0027] Furthermore, the tag terminal achieves contactless communication with the reader terminal through an RFID antenna, ensuring the security and real-time performance of data transmission; the modules work together to maintain normal operation by relying on the collected radio frequency energy without a built-in battery, adapting to the sealed and high-voltage working environment of lithium-ion batteries, and realizing long-term stable monitoring of the internal state of the battery.

[0028] The radio frequency energy harvesting and communication module receives the radio frequency signal emitted by the reader through the RFID antenna, and converts it into DC power using the internal rectifier circuit to power other modules on the tag. The radio frequency energy harvesting and communication module also demodulates the instructions sent by the reader and sends the sensor data back to the reader. The microcontroller unit controls the entire data acquisition and transmission process. It has an internal digital-to-analog conversion circuit that converts the analog signals inside the battery acquired by the Mylar membrane integrated sensor 1 into corresponding digital signals, filters and calibrates the raw data, and transmits the processed signals to the radio frequency energy acquisition and communication module. The power management module further smooths and stabilizes the DC power generated by the radio frequency energy acquisition and communication module, preventing voltage fluctuations from causing abnormal operation of the microcontroller unit.

[0029] Furthermore, the antenna is an RFID antenna with an integrated point design; it can overcome the electromagnetic shielding effect of the metal casing, and achieve real-time monitoring of the internal temperature and pressure signals of the battery and accurate data transmission without damaging the battery casing. The reader is an RFID reader, which is used to connect to the main control MCU and the host computer.

[0030] Example 2 Based on Example 1, the Mylar membrane integrated sensor is further specified, and the performance of Example 2 is even better after the specification.

[0031] The Mylar membrane integrated sensor has a stacked structure, including a first polyester film, a second polyester film, and an elastic conductive film. The elastic conductive film is disposed between the first polyester film and the second polyester film. For ease of distinction, this application uses the substrate structure in the Mylar membrane integrated sensor manufacturing process as the first polyester film and the top sealing structure as the second polyester film. That is to say, the temperature sensing part and the pressure sensing part are located between the two polyester films. One polyester film is used as the substrate, and the other polyester film is used for encapsulation.

[0032] A sensing circuit formed by conductive silver paste is printed on the surface of the first polyester film. The sensing circuit has a temperature sensing part and a pressure sensing part. The sensing circuit is attached to the surface of the first polyester film. The pressure sensing part is composed of interdigitated electrodes prepared by screen printing process, which form ohmic contact with the elastic conductive film.

[0033] Furthermore, the elastic conductive film is composed of a fiber skeleton material and a conductive filler; the elastic conductive film is prepared by a composite molding process using a fiber skeleton material as a supporting substrate and a conductive filler, wherein the fiber skeleton material is used to ensure the elastic properties of the film and the conductive filler is used to impart conductivity to the film.

[0034] Furthermore, the pressure sensing unit is composed of interdigitated electrodes prepared by screen printing process. When the interdigitated electrodes come into contact with the elastic conductive film, a variable resistance structure is formed. The resistance value of the variable resistance structure changes with the contact pressure. Furthermore, the interdigitated electrode is in contact with the aforementioned elastic conductive film, forming a variable resistance structure between them. When the internal pressure of the battery changes, the elastic conductive film deforms, causing changes in its contact area and contact pressure with the interdigitated electrode, which in turn causes a corresponding change in the resistance value of the variable resistance structure, thereby enabling the detection of pressure signals. Except for the pressure sensing part, all other parts of the sensing circuit are covered with an insulating protective layer to prevent internal short circuits.

[0035] Furthermore, the fiber skeleton material in the elastic conductive film includes one or any combination of glass fiber, cotton fiber, polyurethane fiber and aramid fiber; The conductive filler is a composite of NTC and PTC nanomaterials. The elastic conductive film with the composite conductive filler has temperature-insensitive resistance, which can maintain the stability of the resistance response over a wide temperature range and effectively avoid the impact of temperature cross-interference on the pressure detection accuracy.

[0036] The NTC nanomaterials include one or any combination of graphene oxide, multi-walled carbon nanotubes, and iron oxide; the PTC nanomaterials include one or any combination of conductive carbon black, nano-metal particles, and barium titanate.

[0037] Furthermore, the temperature sensing element is formed using a photolithography process, and the temperature sensing element is made of platinum metal material; The platinum metal is formed into a Peano curve fractal structure to reduce the adverse effects of strain on the temperature response performance of the platinum resistance thermometer.

[0038] Furthermore, the fabrication of the Mylar membrane integrated sensor includes the following steps: Step S1: Select two polyester films as the first polyester film and the second polyester film respectively to form two flexible substrate layers. Clean and dry the two polyester films to remove residual impurities on the surface of the polyester films. Step S2: A layer of photoresist is uniformly coated on the surface of the first polyester film. The platinum metal circuit pattern of the temperature sensing part is defined by photolithography. After exposure and development, a platinum metal layer is deposited in a vacuum evaporation system and then stripped to form a platinum resistor with a Peano curve fractal structure as the temperature sensing part. Step S3: Using screen printing, conductive silver paste is printed on the surface of the first polyester film on which the platinum resistor is formed to form the interdigitated electrodes of the sensing circuit as the pressure sensing part, and an insulating protective layer is covered on the non-pressure sensing part. Step S4: The composite conductive filler and binder are added to an organic solvent to disperse and form a uniform conductive slurry. The fiber skeleton material is impregnated in the conductive slurry. After multiple impregnations and drying, an elastic conductive film with a three-dimensional conductive network structure is obtained. Step S5: Place the elastic conductive film between the first polyester film and the second polyester film, and heat-seal the polyester film around its perimeter to achieve a three-layer sealed encapsulation.

[0039] A battery includes a battery cell, a battery casing, and a wireless temperature and pressure monitoring device for the battery as described above. The Mylar membrane of the Mylar membrane integrated sensor 1 is wrapped around the battery cell. The wrapped battery cell and the Mylar membrane integrated sensor 1 are disposed inside the battery casing, and a tag is disposed between the battery cell and the battery casing.

[0040] In summary, (1) the wireless temperature and pressure monitoring device for lithium batteries of the present invention combines radio frequency technology with Mylar membrane integrated sensors, enabling the sensors to be directly integrated into the lithium battery for real-time monitoring. The sensors include a temperature sensing unit and a pressure sensing unit, and through radio frequency energy acquisition and wireless transmission technology, accurate monitoring of the internal temperature and pressure of the lithium battery is achieved. Compared with the prior art, the present invention effectively solves the problems of data lag and deviation in traditional battery monitoring, and significantly improves the accuracy and real-time performance of monitoring. (2) the wireless temperature and pressure monitoring device for lithium batteries of the present invention uses Mylar membrane as the substrate and encapsulation layer of the sensor. Mylar membrane is not only an inherent material inside the battery, but also part of the battery structure. When it is introduced as the substrate and encapsulation layer of the sensor, it will not change the internal structure of the battery. Since the Mylar membrane is highly compatible with the original design of the battery, its use can achieve seamless integration, avoiding compatibility problems and structural complexity caused by external materials. Mylar membrane has excellent electrical insulation, chemical stability and thermal stability, and can work stably in the high temperature and high pressure environment inside the battery without affecting the battery function. Meanwhile, the flexibility and adaptability of the Mylar membrane enable it to withstand the expansion and contraction of the battery during charging and discharging, ensuring the long-term stability of the sensor. (3) The temperature sensing part of the wireless monitoring device for internal temperature and pressure of lithium battery of the present invention is prepared by photolithography, which improves the processing accuracy and consistency of the platinum resistance, reduces the structural size of the temperature sensing part, improves the response time of temperature sensing, and enhances the sensitivity and reliability of the sensor. (4) The temperature and pressure wireless monitoring device for internal temperature and pressure of lithium battery of the present invention adopts a Peano curve fractal structure platinum resistance and a PTC conductive filler and NTC conductive filler synergistic control mechanism to achieve independent temperature and pressure response, effectively avoids temperature and pressure signal coupling interference, and improves demodulation accuracy. (5) The temperature and pressure wireless monitoring device for internal temperature and pressure of lithium battery of the present invention integrates the RFID antenna into the electrode insulation layer of the battery end cap, avoids the electromagnetic shielding effect of the battery shell metal material, ensures stable wireless signal transmission, and overcomes the application limitations of traditional wireless transmission technology in battery metal shell. The device uses a radio frequency energy acquisition and communication module, which does not require built-in battery power supply, greatly extends the service life of the monitoring system, and avoids the maintenance problems caused by traditional battery power supply.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A wireless monitoring device for internal temperature and pressure of a battery, characterized in that: It includes a Mylar membrane integrated sensor (1) and a tag end. The tag end is connected to the Mylar membrane integrated sensor (1). The Mylar membrane integrated sensor (1) includes a Mylar membrane covering the battery cell. The Mylar membrane integrates a temperature sensing unit and a pressure sensing unit for real-time monitoring of the temperature and pressure inside the battery. The tag end is used to collect sensor signals and transmit the data to the reader end.

2. The wireless battery internal temperature and pressure monitoring device as described in claim 1, characterized in that: An antenna is located at the insulating layer of the terminal post on the battery end cap, and the tag end is connected to the reader end through the antenna.

3. The wireless battery internal temperature and pressure monitoring device as described in claim 2, characterized in that: The tag includes a radio frequency energy harvesting and communication module, a microcontroller unit and a power management module, which are set inside the battery. The microcontroller unit is connected to the radio frequency energy harvesting and communication module and the power management module respectively. The radio frequency energy harvesting and communication module is connected to the reader end through the antenna. It is used to receive the radio frequency signal emitted by the reader end, convert it into DC power, and transmit the collected data to the reader end. The microcontroller unit is connected to the Mylar membrane integrated sensor (1). The antenna is an RFID antenna, and the reader / writer is an RFID reader / writer.

4. The wireless battery internal temperature and pressure monitoring device as described in any one of claims 1 to 3, characterized in that: The Mylar membrane integrated sensor comprises a first polyester film, an elastic conductive film, and a second polyester film arranged in sequence. A sensing circuit formed by conductive silver paste is arranged on the surface of the first polyester film. A temperature sensing part and a pressure sensing part are disposed in the sensing circuit. The sensing circuit is attached to the surface of the first polyester film, and the pressure sensing part forms an ohmic contact with the elastic conductive film.

5. The wireless battery internal temperature and pressure monitoring device as described in claim 4, characterized in that: The elastic conductive film is composed of a fiber skeleton material and a conductive filler.

6. The wireless battery internal temperature and pressure monitoring device as described in claim 4, characterized in that: The pressure sensing unit is composed of interdigitated electrodes prepared by screen printing process. When the interdigitated electrodes come into contact with the elastic conductive film, a variable resistance structure is formed. The resistance value of the variable resistance structure changes with the contact pressure. Except for the pressure sensing part, all other parts of the sensing circuit are covered with an insulating protective layer.

7. The wireless monitoring device for internal temperature and pressure of a battery as described in claim 4, characterized in that: The fiber skeleton material in the elastic conductive film includes one or any combination of glass fiber, cotton fiber, polyurethane fiber and aramid fiber. The conductive filler is a composite of NTC nanomaterials and PTC nanomaterials.

8. The wireless temperature and pressure monitoring device for a battery as described in claim 4, characterized in that: The temperature sensing element is formed using photolithography and is made of platinum metal, which is formed into a Peano curve fractal structure.

9. The wireless monitoring device for internal temperature and pressure of a battery as described in claim 1, characterized in that, The fabrication of the Mylar membrane integrated sensor includes the following steps: Two polyester films were selected as the first polyester film and the second polyester film, respectively, and residual impurities on the surface of the polyester films were removed. A layer of photoresist is uniformly coated on the surface of the first polyester film. The platinum metal circuit pattern of the temperature sensing part is defined by photolithography. After exposure and development, a platinum metal layer is deposited and then stripped to form a platinum resistor with a Peano curve fractal structure, which serves as the temperature sensing part. Conductive silver paste is printed on the surface of a first polyester film with a platinum resistance formed by screen printing process to form a sensing circuit and interdigitated electrodes. The interdigitated electrodes serve as pressure sensing parts, and an insulating protective layer is covered on the non-pressure sensing parts. Composite conductive fillers and binders are dispersed in an organic solvent to form a uniform conductive slurry. Fiber skeleton materials are then impregnated in the conductive slurry. After multiple impregnations and drying, an elastic conductive film with a three-dimensional conductive network structure is obtained. An elastic conductive film is placed between the first polyester film and the second polyester film, and the polyester film is heat-sealed around its perimeter to achieve a three-layer sealed encapsulation.

10. A battery, characterized in that: The device includes a battery cell, a battery casing, and a wireless temperature and pressure monitoring device for the battery as described in any one of claims 1 to 9. The Mylar membrane of the Mylar membrane integrated sensor (1) is wrapped around the battery cell. The Mylar membrane integrated sensor (1) and the wrapped battery cell are disposed inside the battery casing, and the tag end is disposed between the battery cell and the battery casing.

Images