Intelligent battery with pressure-sensitive film, battery module, electronic equipment and power device

Abstract

The utility model discloses an intelligent battery with a pressure-sensitive film, a battery module, electronic equipment and a power device. The intelligent battery with the pressure-sensitive film mainly comprises a tab, a battery cell, a packaging shell, electrolyte and the pressure-sensitive film, the packaging shell is provided with a closed containing cavity, and the battery cell and the electrolyte are contained in the containing cavity. The pressure-sensitive film comprises a sensing part and a signal transmission part, the sensing part is arranged in the accommodating cavity and fixed between the battery cell and the packaging shell, the sensing part is provided with a sensing point, and electrolyte is arranged between any one of the packaging shell or the battery cell and the sensing point. Wherein the sensing point is arranged to be of a structure capable of forming an electric double-layer capacitor with the electrolyte, and the capacitance of the pressure-sensitive film changes along with the change of the contact area between the sensing point and the electrolyte. Through the sensing part arranged between the battery cell and the packaging shell, the change condition of the expansion force of the battery cell can be reflected more accurately, the influence of the packaging shell on the detection of the expansion force of the battery cell is effectively reduced, the accuracy of the detection of the expansion force of the battery cell is greatly improved, and the lithium precipitation phenomenon of the battery cell is favorably analyzed.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to an intelligent battery with a pressure-sensitive film, a battery module, an electronic device and a power device. Background Art

[0002] At present, common new energy vehicles usually use rechargeable batteries to provide power. In order to improve the reliability and safety of new energy vehicles, it is particularly important to conduct safety testing on rechargeable batteries. One of the detection methods is to monitor the expansion force of the battery. At present, single-point or multi-point pressure sensors are usually set on the outside of the battery shell to detect the expansion of the battery.

[0003] At present, the more mature means of lithium battery pressure monitoring is mainly measured on the outside of the battery shell, by attaching thin film pressure sensors, thin film strain gauges or directly using weighing sensors on the outside of the battery. However, the inside of the battery is usually a multi-layer winding or stacked structure, coupled with external packaging. Once failure warning signals such as lithium deposition appear inside, the pressure is transmitted to the outside with certain distortion and lag, resulting in the inability of external sensors to respond to internal battery failures in a timely manner, especially when the pressure change is low in the early stage of failure. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a smart battery with a pressure-sensitive film, a battery module, an electronic device and a power device.

[0005] The technical solution of the utility model is as follows:

[0006] The utility model discloses an intelligent battery with a pressure-sensitive film, the intelligent battery comprising a tab, a battery cell, a packaging shell, an electrolyte and a pressure-sensitive film, the packaging shell being provided with a sealed accommodating cavity, the battery cell and the electrolyte being accommodated in the accommodating cavity; the pressure-sensitive film comprising a sensing part and a signal transmission part, the sensing part being provided in the accommodating cavity and fixed between the battery cell and the packaging shell, the sensing part being provided with a sensing point, the electrolyte being provided between the packaging shell or any one of the battery cells and the sensing point; wherein the sensing point is provided with a structure capable of forming a double-layer capacitor with the electrolyte, and the capacitance of the pressure-sensitive film changes with the change of the contact area between the sensing point and the electrolyte.

[0007] Optionally, the sensing point includes a substrate, interdigitated electrodes formed on the surface of the substrate, and a thin film connected to the substrate and covering the interdigitated electrodes, wherein a through hole connecting the interdigitated electrodes and an external space is provided between the thin film and the substrate, and the electrolyte enters between the thin film and the substrate through the through hole.

[0008] Optionally, the sensing point is arranged opposite to the inner wall of the packaging shell, the sensing point includes a substrate and interdigitated electrodes formed on the surface of the substrate, and the electrolyte and the interdigitated electrodes form a double-layer capacitor.

[0009] Optionally, the pressure-sensitive film includes a sensing portion, which is disposed at a middle position of the surface of the battery cell and fixed between the battery cell and the packaging shell.

[0010] Optionally, the pressure-sensitive film includes a plurality of sensing parts and a signal transmission part, the plurality of sensing parts are connected to the signal transmission part, and the plurality of sensing parts are respectively arranged at different positions on the same surface of the battery cell and fixed between the battery cell and the packaging shell.

[0011] Optionally, the signal transmission part is fixed to one side of the packaging shell, a part of the signal transmission part is accommodated in the accommodating cavity and connected to the sensing part, and the other part extends out of the accommodating cavity; the sensing part is clamped between the outer surface of the battery cell and the inner wall of the packaging shell.

[0012] Optionally, the portion of the signal transmission portion extending from the accommodating cavity and the portion of the tab extending from the accommodating cavity are arranged on the same side of the packaging shell.

[0013] Optionally, the packaging shell is a flexible packaging shell, the signal transmission part is a flexible signal transmission part, and a side of the packaging shell where the signal transmission part extends out is sealed by a sealant.

[0014] The utility model discloses a battery module, which comprises a collector and the above-mentioned intelligent battery. The collector is connected to a signal transmission part to input an electrical signal to the sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure-sensitive film.

[0015] The utility model discloses an electronic device, wherein a functional element, a collector and the above-mentioned smart battery are arranged in the electronic device, wherein the smart battery provides electric energy for the functional element; the collector is connected to the signal transmission part to input an electric signal to the sensing point and obtain a feedback electric signal to obtain a capacitance change of the pressure-sensitive film.

[0016] The utility model discloses a power device, wherein a collector, a driving device and the above-mentioned smart battery are arranged in the power device, the smart battery is connected with the driving device to provide electric energy for the driving device, and the power device is powered by the power device; the collector is connected with the signal transmission part to input an electric signal to the sensing point and obtain a feedback electric signal to obtain a capacitance change of the pressure-sensitive film.

[0017] Beneficial effects:

[0018] In order to further improve the accuracy of the expansion force detection of the battery cell, the sensing part is fixed between the battery cell and the packaging shell in the present invention. The sensing part arranged between the battery cell and the packaging shell can more accurately reflect the change of the expansion force of the battery cell, and can effectively reduce the influence of the packaging shell on the expansion force detection of the battery cell, which greatly improves the accuracy of the expansion force detection of the battery cell, and also helps to analyze the lithium deposition phenomenon of the battery cell. In the present invention, the sensing part is fixed between the battery cell and the packaging shell. The sensing part arranged between the battery cell and the packaging shell can more accurately reflect the change of the expansion force of the battery cell, and can effectively reduce the influence of the packaging shell on the expansion force detection of the battery cell, which greatly improves the accuracy of the expansion force detection of the battery cell, and also helps to analyze the lithium deposition phenomenon of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A partial cross-sectional view of one structure of a smart battery with a pressure-sensitive film of the present application;

[0020] Figure 2 A partial cross-sectional view of one structure of the smart battery with a pressure-sensitive film of the present application in an initial state;

[0021] Figure 3 A partial cross-sectional view of one structure of the smart battery with a pressure-sensitive film of the present application when expansion occurs;

[0022] Figure 4 A partial cross-sectional view of another structure of the smart battery with a pressure-sensitive film of the present application when expansion occurs;

[0023] Figure 5 A partial schematic diagram of one structure of the pressure-sensitive film of the present application;

[0024] Figure 6 A partial cross-sectional view of another structure of a smart battery with a pressure-sensitive film according to the present application;

[0025] Figure 7 A partial cross-sectional view of one structure of the battery module of the present application;

[0026] Figure 8 Schematic diagram of the connection between the smart battery with pressure-sensitive film and the collector. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, if there are terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if there are terms such as "first" and "second", they are used to distinguish similar objects, and are not necessarily used to describe a specific order or relative importance. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood in combination with specific circumstances. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, but may include other units that are not clearly listed or inherent to these products or devices.

[0029] Taking soft-pack batteries as an example, existing soft-pack batteries mainly include a battery cell, a positive electrode ear, a negative electrode ear and a shell. The shell serves as a protective shell of the battery and covers the entire battery cell. The positive electrode ear and the negative electrode ear are partially arranged in the shell and connected to the battery cell, and the other part extends out of the shell. The battery cell is usually a rectangular pancake structure, and its surface specifically includes a front and a back side arranged opposite to each other and four side surfaces connecting the front and the back sides. The positive electrode ear and the negative electrode ear are usually arranged on the same side. When the expansion force of the battery needs to be detected, the pressure sensor is usually arranged on the outer surface of the shell. The utility model designs a smart battery with a pressure-sensitive film, and the pressure-sensitive film is arranged inside the battery. The expansion of the battery cell can be directly detected by the pressure-sensitive film, thereby realizing the detection of the internal pressure of the battery.

[0030] Please combine Figures 1 to 3The first embodiment of the present application discloses a smart battery 10 with a pressure-sensitive film. The smart battery 10 with a pressure-sensitive film mainly includes a tab 20, a battery cell 30, a packaging shell 40, an electrolyte 50 and a pressure-sensitive film 60. The packaging shell 40 is provided with a sealed accommodating cavity, and the battery cell 30 and the electrolyte 50 are accommodated in the accommodating cavity. The pressure-sensitive film 60 includes a sensing part 61 and a signal transmission part 62. The sensing part 61 is arranged in the accommodating cavity and fixed between the battery cell 30 and the packaging shell 40. The sensing part 61 is provided with a sensing point 63. There is an electrolyte between the packaging shell 40 or the battery cell 30 and the sensing point 63. Among them, the sensing point 63 is set to a structure that can form a double-layer capacitor with the electrolyte 50, and the capacitance of the pressure-sensitive film 60 changes with the change of the contact area between the sensing point 63 and the electrolyte.

[0031] It is understandable that the battery cell 30 is immersed in the electrolyte 50, and the electrolyte 50 provides some active ions as a transmission medium for use as conductive ions. In this embodiment, there is an electrolyte 50 between the packaging shell 40 or any one of the battery cells 30 and the sensing point 63, so that the ions in the electrolyte 50 and the sensing point 63 can form a double-layer capacitor. When the contact area between the sensing point 63 and the electrolyte 50 changes, the capacitance of the pressure-sensitive film 60 will also change. It is understandable that when the battery is charged, the battery cell will expand and squeeze the packaging shell 40; at the same time, when some irreversible lithium precipitation occurs in the battery cell, it will also cause the battery cell to partially thicken and squeeze the packaging shell 40. In the present application, the sensing part 61 is arranged in the accommodating cavity and fixed between the battery cell 30 and the packaging shell 40, so that the contact area between the sensing point 63 and the electrolyte 50 will change because the battery cell squeezes the packaging shell 40. By analyzing the change in capacitance of the pressure-sensitive film 60, the expansion force or lithium precipitation change of the battery cell 30 can be further obtained.

[0032] It is understandable that when the battery cell 30 is charging and discharging, lithium deposition will occur inside the battery cell 30. When lithium is deposited, the battery cell 30 often causes local expansion of the battery cell 30, and some smaller expansion forces are difficult to be transmitted to the outside through the packaging shell 40. At the same time, due to the limitation of the structure of the packaging shell 40, part of the expansion force of the battery cell 30 is difficult to be transmitted to the outside through the packaging shell 40 when the battery cell 30 expands. In order to further improve the accuracy of the expansion force detection of the battery cell 30, the sensing part 61 is fixed between the battery cell 30 and the packaging shell 40 in the utility model. The sensing part 61 provided between the battery cell 30 and the packaging shell 40 can more accurately reflect the change of the expansion force of the battery cell, and can effectively reduce the influence of the packaging shell 40 on the expansion force detection of the battery cell 30, which greatly improves the accuracy of the expansion force detection of the battery cell 30, and also helps to analyze the lithium deposition phenomenon of the battery cell 30.

[0033] It is understandable that the life of the sensing part affects the service life of the smart battery, and the sensing part is arranged in a closed housing cavity and is difficult to replace. Therefore, in order to further improve the life of the sensing part, in the present application, the sensing point is in direct contact with the electrolyte, and the electrolyte is directly used as part of the sensing structure, and the electrode is formed using a material that is stable in the electrolyte for a long time. Therefore, there is no stability problem existing in the traditional pressure sensor, which can further avoid the adverse effects of the traditional packaging method on the sensitivity of the pressure sensing film.

[0034] Please combine Figure 2 and Figure 5 As an embodiment, the sensing point 63 includes a substrate 631, an interdigital electrode 632 formed on the surface of the substrate 631, and a film 633 connected to the substrate 631 and covering the interdigital electrode 632. A through hole is provided between the film 633 and the substrate 631 to connect the interdigital electrode with the external space. The electrolyte 50 enters between the film 633 and the substrate 631 through the through hole to form a double-layer capacitor with the interdigital electrode 632. When the battery cell 30 expands and causes the internal pressure to increase, the expansion force of the battery cell 30 squeezes the sensing point 63, thereby increasing the contact area between the film 633 and the substrate 631, so that the electrolyte 50 contained between the film 633 and the interdigital electrode 632 flows out through the through hole, thereby reducing the contact area between the electrolyte 50 and the interdigital electrode 632. Since the double-layer capacitor is not formed between the film 633 and the interdigital electrode 632, the double-layer capacitor of the pressure-sensitive film 60 is reduced. In this embodiment, the capacitance of the pressure-sensitive film 60 is negatively correlated with the external pressure. The greater the external pressure, the smaller the contact area between the electrolyte 50 and the interdigital electrode 632, and the lower the capacitance. Therefore, by detecting the capacitance of the pressure-sensitive film 60, the pressure magnitude or pressure change can be detected. In one embodiment, the substrate 631 of the sensing point 63 is a corrosion-resistant polyolefin material, such as polypropylene, polyethylene, etc. The interdigital electrode can be made on the substrate 631 by patterned magnetron sputtering of gold, silver, copper and other metals.

[0035] Among them, the film 633 can be a conventional battery separator, made of materials such as PP, PE, etc. It can be understood that the battery separator is generally composed of polyolefins or fluorinated polymer materials such as polypropylene, polyethylene, polytetrafluoroethylene, etc. These materials will not change their mechanical and electrical properties in the electrolyte environment, and the porous structure of the separator itself makes its surface have a microscopic rough morphology, so that the electrolyte 50 can flow through these porous structures between the film 633 and the substrate 631 and then form a double-layer capacitor with the interdigital electrodes 632.

[0036] Please combine Figures 4 to 5As another embodiment, the sensing point 63 includes a substrate 631 and a finger electrode 632 formed on the surface of the substrate 631, and the ions in the electrolyte 50 form a double-layer capacitor with the finger electrode 632. When the battery cell 30 expands and causes the internal pressure to increase, the expansion force of the battery cell 30 will cause the contact area between the package shell 40 or any one of the battery cells 30 and the sensing point 63 to increase, thereby reducing the contact area between the electrolyte 50 and the finger electrode 632. Since no double-layer capacitor is formed between the package shell 40 and the finger electrode 632, the double-layer capacitor of the pressure-sensitive film 60 is reduced. In this embodiment, the capacitance of the pressure-sensitive film 60 is negatively correlated with the external pressure. The greater the external pressure, the smaller the contact area between the electrolyte 50 and the finger electrode 632, and the lower the capacitance. Therefore, by detecting the capacitance of the pressure-sensitive film 60, the pressure size or pressure change can be detected. In one embodiment, the substrate 631 of the sensing point 63 is a corrosion-resistant polyolefin material, such as polypropylene, polyethylene, etc. Finger electrodes can be made on the substrate 631 by patterned magnetron sputtering of metals such as gold, silver, and copper. As a preferred embodiment, the sensing point 63 is arranged opposite to the inner wall of the packaging shell 40, and there is an electrolyte 50 between the inner wall of the packaging shell 40 and the sensing point 63. It can be understood that the inner wall of the packaging shell 40 usually has a relatively rough surface. For example, when the smart battery of the present application is a soft-pack battery, the packaging shell of the soft-pack battery usually adopts an aluminum-plastic film, and the inner wall of the aluminum-plastic film has a certain degree of roughness. It can be understood that when the sensing point 63 contacts the inner wall of the packaging shell 40, the contact area between the sensing point 63 and the packaging shell 40 increases under a small force, thereby reducing the contact between the electrolyte 50 and the sensing point 63, that is, the rough surface of the packaging shell 40 can make the contact area between the sensing point 63 and the electrolyte 50 change greatly, so that the sensitivity of the pressure-sensitive film 60 can be further improved, so that the pressure-sensitive film 60 can detect small forces.

[0037] In this embodiment, the signal transmission part 61 is used to connect with an external device (such as a collector) to transmit an electrical signal to the sensing point 63, and transmit the changed electrical signal to the external device. The signal transmission part 61 is fixed to one side of the packaging shell 40, a part of the signal transmission part 61 is accommodated in the accommodating cavity and connected to the sensing part 63, and the other part extends out of the accommodating cavity. The sensing part 63 is clamped between the outer surface of the battery cell 30 and the inner wall of the packaging shell 40. In this embodiment, the signal transmission part 61 is connected to the sensing part 63, and the signal transmission part 61 is fixed to one side of the packaging shell 40, so that when the smart battery completes the entire processing technology, the position of the battery cell 30 corresponding to the sensing part 63 will not shift with the long-term use of the battery, and the expansion force of the corresponding position of the battery cell 30 can be obtained more accurately and reliably through the sensing part 63. Since the sensing part 63 is clamped between the outer surface of the battery cell 30 and the inner wall of the packaging shell 40, it will not change the existing conventional battery manufacturing process too much, which is more convenient for the processing and manufacturing of smart batteries. The signal transmission part 61 can be fixed to one side of the packaging shell 40 by means of sealing adhesive.

[0038] As a common technology in the art, a portion of the tab 20 of the battery is accommodated in the accommodating cavity and connected to the battery cell 30, and the other portion extends out of the accommodating cavity. As a preferred solution, the portion of the signal transmission part 61 extending from the accommodating cavity and the portion of the tab 20 extending from the accommodating cavity are arranged on the same side of the packaging shell 40. It can be understood that when the packaging shell 40 is packaged, it is more convenient to package by arranging the signal transmission part 61 and the tab 20 on the same side of the packaging shell 40. At the same time, when multiple smart batteries are provided, it is more convenient to integrate the smart batteries by arranging the signal transmission part 61 and the tab 20 on the same side.

[0039] The utility model does not impose any specific restriction on the number of sensing parts 62 provided in the smart battery. The smart battery may be provided with only one sensing part 63, or may be provided with multiple sensing parts 62 to detect the expansion force of multiple areas of the battery cell.

[0040] Please continue reading Figure 1 As an implementation scheme, the pressure-sensitive film 60 includes a sensing portion 62 , which is disposed in the middle of the surface of the battery cell 30 and fixed between the battery cell 30 and the packaging shell 40 .

[0041] See also Figure 6As another embodiment, the pressure-sensitive film 60 includes a plurality of sensing parts 62 and a signal transmission part 61, and the plurality of sensing parts 62 are connected to the signal transmission part 61. The plurality of sensing parts 62 are respectively arranged at different positions on the same surface of the battery cell 30 and fixed between the battery cell 30 and the packaging shell 40. It can be understood that in this embodiment, by providing a plurality of sensing parts 62, the expansion force detection of multiple areas of the battery cell 30 can be realized, and more characteristics of the change of the expansion force of the battery cell can be obtained.

[0042] The utility model does not specifically limit the type of smart battery. The smart battery can be a soft-pack battery with a pressure-sensitive film, or a lithium battery with a hard shell. In the art, the soft-pack battery and the lithium battery with a hard shell have different processes for sealing the shell. For example, the lithium battery with a hard shell usually seals the shell by welding, while the soft-pack battery usually uses a sealant to bond and seal the shell. In this embodiment, the structure of the signal transmission part is set to adapt to different types of shells.

[0043] As an implementation manner, the packaging shell is a flexible packaging shell, the signal transmission part is a flexible signal transmission part, and a side of the packaging shell where the signal transmission part extends out is sealed by a sealant.

[0044] As an implementation manner, the packaging shell is a flexible and hard packaging shell, the signal transmission part at least includes a welding part, and the welding part of the signal transmission part is sealed with the packaging shell by welding.

[0045] See also Figure 7 and Figure 8 The second embodiment of the utility model provides a battery module, the battery module includes a collector 70 and at least one of the above-mentioned smart batteries 10, the collector 70 is connected to the signal transmission part 61 to input the electrical signal to the sensing point and obtain the feedback electrical signal to obtain the capacitance change of the pressure-sensitive film. The structure and beneficial effects of the smart battery have been described above and will not be repeated here. This embodiment does not specifically limit the number of smart batteries 10 in the battery module. The battery module can be provided with multiple ordinary batteries and one smart battery 10, the battery module can also be provided with multiple ordinary batteries and multiple smart batteries 10, or the battery module can only be provided with multiple smart batteries 10.

[0046] The third embodiment of the utility model provides an electronic device, in which a functional element, a collector and at least one of the above-mentioned smart batteries are provided. The smart battery provides power for the functional element, and the collector is connected to the signal transmission part to input an electrical signal to a sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure-sensitive film. The structure and beneficial effects of the smart battery have been described above and will not be repeated here. In this embodiment, the electronic device can be a mobile phone provided with a smart battery, a computer provided with a smart battery, or other electronic devices provided with a smart battery.

[0047] The fourth embodiment of the utility model provides a power device, in which a collector, a smart battery and a driving device are provided. The smart battery is connected to the driving device to provide electrical energy to the driving device, and the power device is powered by the power device. The collector is connected to the signal transmission part to input an electrical signal to the sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure-sensitive film. The structure and beneficial effects of the smart battery have been described above and will not be repeated here. In this embodiment, the power device can be a vehicle or an airplane, etc.

[0048] Finally, it should be noted that, although the embodiments of the utility model are described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and guiding, but not restrictive. Under the enlightenment of this specification, ordinary technicians in this field can also make many forms without departing from the scope of protection of the claims of the utility model, which all belong to the protection of the utility model.

Claims

1. A smart battery with a pressure-sensitive film, the smart battery comprising a tab, a battery cell, a packaging shell, an electrolyte and a pressure-sensitive film, the packaging shell being provided with a sealed accommodation cavity, the battery cell and the electrolyte being accommodated in the accommodation cavity; the pressure-sensitive film comprising a sensing portion and a signal transmission portion, the sensing portion being provided in the accommodation cavity and fixed between the battery cell and the packaging shell, the sensing portion being provided with a sensing point, the electrolyte being provided between the packaging shell or any one of the battery cell and the sensing point; wherein, The sensing point is configured to form a double-layer capacitor structure with the electrolyte, and the capacitance of the pressure-sensitive film changes as the contact area between the sensing point and the electrolyte changes.

2. The smart battery with pressure-sensitive film as claimed in claim 1, characterized in that: The sensing point includes a substrate, interdigitated electrodes formed on the surface of the substrate, and a film connected to the substrate and covering the interdigitated electrodes. A through hole connecting the interdigitated electrodes and an external space is provided between the film and the substrate, and the electrolyte enters between the film and the substrate through the through hole.

3. The smart battery with pressure-sensitive film as claimed in claim 1, characterized in that: The sensing point is arranged opposite to the inner wall of the packaging shell, and the sensing point includes a substrate and interdigital electrodes formed on the surface of the substrate, and the electrolyte and the interdigital electrodes form a double-layer capacitor.

4. The smart battery with pressure-sensitive film as claimed in claim 1, characterized in that: The pressure-sensitive film includes a sensing portion, which is arranged at a middle position on the surface of the battery cell and fixed between the battery cell and the packaging shell.

5. The smart battery with pressure-sensitive film as claimed in claim 1, characterized in that: The pressure-sensitive film includes a plurality of sensing parts and a signal transmission part. The plurality of sensing parts are connected to the signal transmission part. The plurality of sensing parts are respectively arranged at different positions on the same surface of the battery cell and fixed between the battery cell and the packaging shell.

6. The smart battery with pressure-sensitive film according to any one of claims 2 to 5, characterized in that: The signal transmission part is fixed to one side of the packaging shell, a part of the signal transmission part is accommodated in the accommodating cavity and connected to the sensing part, and the other part extends out of the accommodating cavity; the sensing part is clamped between the outer surface of the battery cell and the inner wall of the packaging shell.

7. The smart battery with pressure-sensitive film as claimed in claim 6, characterized in that: The portion of the signal transmission portion extending from the accommodating cavity and the electrode tab are arranged on the same side of the packaging shell.

8. The smart battery with pressure-sensitive film as claimed in claim 6, characterized in that: The packaging shell is a flexible packaging shell, the signal transmission part is a flexible signal transmission part, and a side of the packaging shell where the signal transmission part extends out is sealed by a sealant.

9. A battery module, characterized in that: The battery module includes a collector and at least one smart battery as described in any one of claims 1-8, and the collector is connected to the signal transmission part to input an electrical signal to the sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure-sensitive film.

10. An electronic device, characterized in that: The electronic device is provided with a functional element, a collector and a smart battery as claimed in any one of claims 1 to 8, and the smart battery provides power for the functional element; The collector is connected to the signal transmission unit to input an electrical signal to the sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure-sensitive film.

11. A power device, characterized in that: The power device is provided with a collector, a driving device and a smart battery as described in any one of claims 1 to 8, the smart battery is connected to the driving device to provide electrical energy to the driving device, and the power device is powered by the power device; the collector is connected to the signal transmission part to input an electrical signal to the sensing point and obtain a feedback electrical signal to obtain a capacitance change of the pressure sensitive film.

Images