Heating film, battery pack with same and electric equipment

Abstract

The invention discloses a heating film, a battery pack with the same and electric equipment, and relates to the technical field of batteries. The heating film comprises a heating film body and a detection conductive part, the detection conductive part is arranged on the heating film body, a heating fusible layer is arranged on the side, facing a battery cell, of the detection conductive part, and the heating fusible layer is an insulating layer and is used for being arranged on a conductive shell of the battery cell. According to the embodiment of the invention, the heating film is integrated with the detection conductive part, the temperature change of the battery cell is detected by detecting whether the conductive part is electrified or not, and the occurrence of thermal runaway of the battery cell is monitored in time.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, in particular to a heating film, a battery pack having the same, and an electrical device. Background Art

[0002] In existing battery packs, thermistor sensors are typically placed inside the battery pack to monitor battery operating status and indicate the occurrence of thermal runaway. These thermistor sensors detect temperature changes in a local area to determine whether abnormal heating is occurring within the battery pack.

[0003] However, in some existing technologies, thermistor sensors are only located in certain areas of the battery pack and are not in direct contact with the battery cells. When thermal runaway first occurs in a battery cell far from the thermistor sensor, the heat generated by it has not yet diffused to the thermistor sensor. The system cannot detect the temperature rise in a timely manner, making it difficult to identify thermal runaway early.

[0004] Therefore, how to improve the response speed and monitoring reliability of the battery system during thermal runaway is one of the research directions. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first aspect of the present invention is to provide a heating film having an integrated detection conductive portion. The detection conductive portion detects changes in battery cell temperature by detecting whether it is energized, thereby timely monitoring the occurrence of thermal runaway in the battery cell.

[0006] A second aspect of the present invention aims to provide a battery pack having the above-mentioned heating film.

[0007] The third aspect of the present invention aims to provide an electrical device having the above-mentioned battery pack.

[0008] According to the first aspect of the present invention, the heating film includes: a heating film body and a detection conductive part, the detection conductive part is arranged on the heating film body, and the detection conductive part is provided with a heating fusible layer on the side facing the battery cell, and the heating fusible layer is an insulating layer and is used to be arranged on the conductive shell of the battery cell.

[0009] According to the heating film of the embodiment of the present invention, a detection conductive part is provided on the heating film body, and the thermal runaway detection function is integrated into the heating film structure, thereby realizing the integration of heating and detection functions. By providing a heating fusible layer on the side of the detection conductive part facing the battery cell, the insulating properties of the heating fusible layer under normal conditions are utilized to cut off the conductive path between the detection conductive part and the battery cell shell. When thermal runaway occurs and causes an abnormal temperature rise, the heating fusible layer is heated and melted, so that the detection conductive part and the battery cell shell form a conductive path, thereby realizing rapid response and identification of thermal runaway events. The technical solution of the present application utilizes the layout characteristics of the heating film body in the battery pack that is close to the battery cell, so that the detection conductive part can be set close to the battery cell, thereby improving the sensitivity and accuracy of the detection response. At the same time, the detection conductive part does not occupy additional internal space of the battery pack, which is conducive to improving the space utilization rate of the battery pack.

[0010] According to some optional embodiments of the present invention, the heating film further includes: a flexible conductive layer, wherein the flexible conductive layer is provided between the detection conductive portion and the heating fusible layer.

[0011] Furthermore, the flexible conductive layer is a conductive foam layer, and the heat-fusible layer is a wax coating.

[0012] Further optionally, the heating film further includes: conductive particles wrapped in the heating fusible layer.

[0013] In some further embodiments, the conductive particles are metal powder or carbon nanotubes.

[0014] According to some optional embodiments of the present invention, the heating film body includes: a first insulating film and a second insulating film that are stacked; the detection conductive part is located between the first insulating film and the second insulating film, and the heating fusible layer is provided on the side of the detection conductive part facing the first insulating film; and a first opening corresponding to the heating fusible layer is provided on the first insulating film.

[0015] Specifically, the conductive detection part is a sheet, the first insulating film and the second insulating film respectively form matching grooves on the sides facing each other, the conductive detection part is arranged in the matching groove, and the first opening is located in the matching groove.

[0016] Specifically, optionally, the heating film body is in sheet shape, and the detection conductive parts are multiple and arranged in rows and at intervals.

[0017] In some further optional embodiments, the detection conductive portion is a conductive sheet, and each conductive sheet is integrally formed with a conductive wire, and the conductive wire is used to be connected to a control circuit of the heating film.

[0018] A battery pack according to an embodiment of the second aspect of the present invention comprises: at least one battery cell and the heating film according to the embodiment of the first aspect of the present invention, each of the battery cells comprising a conductive shell and an insulating protective film covering the outer surface of the conductive shell, the insulating protective film being provided with a detection hole for exposing a portion of the conductive shell; the heating film being provided on the battery cell, and the heated fusible layer being located in the detection hole and connected to the conductive shell.

[0019] An electric device according to an embodiment of a third aspect of the present invention includes a battery pack according to an embodiment of the second aspect of the present invention.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0022] Figure 1 Schematic diagram of the structure of the heating film in some embodiments of the present invention;

[0023] Figure 2 This is a diagram showing the arrangement of the heating film in the battery pack in some embodiments of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the detection conductive part in some embodiments of the present invention;

[0025] Figure 4 is a cross-sectional view of a heating film in some embodiments of the present invention;

[0026] Figure 5 Schematic diagram of the arrangement of the detection conductive portion on the heating film body in some embodiments of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the battery pack in some embodiments of the present invention;

[0028] Figure 7 Schematic diagram of the position of the detection hole on the battery cell in some embodiments of the present invention.

[0029] Reference numerals:

[0030] Battery pack 1000,

[0031] Heating film 100,

[0032] Heating film body 10, matching groove 11, first insulating film 111, second insulating film 112, first opening 113,

[0033] Detection conductive part 30, heating fusible layer 31, conductive sheet 32, conductive wire 33,

[0034] Flexible conductive layer 50,

[0035] Battery Cell 200,

[0036] Shell 201 , insulating protective film 202 , and detection hole 203 . DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation and be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] Reference below Figure 1-Figure 5 A heating film 100 according to an embodiment of a first aspect of the present invention will be described.

[0041] It's worth noting that some battery packs 1000 often include a heating film 100. The heating film 100 in the battery pack 1000 is primarily used to heat the battery cells 200, ensuring they function properly in low-temperature environments. Typically, the heating film 100 activates heating when the cell 200 temperature falls below a preset value and deactivates when the temperature rises within a set range, thereby maintaining the cell 200 temperature within a relatively stable range.

[0042] like Figure 1 As shown, the heating film 100 includes a heating film body 10 and a detection conductive part 30 .

[0043] Under normal operating conditions, the heating film 100 heats the battery cell 200. A complete heating circuit is incorporated into the heating film 100 to regulate the temperature of the battery cell 200. When the temperature of the battery cell 200 falls below a preset value, the heating circuit activates, causing the heating film 100 to generate heat. Once the temperature rises to a set range, such as 20°C to 30°C, the heating circuit deactivates, maintaining the battery cell 200 within an appropriate operating temperature range.

[0044] The detection conductive part 30 is provided on the heating film body 10 and is located on the side facing the battery cell 200. A heating fusible layer 31 is provided between the detection conductive part 30 and the battery cell 200. The heating fusible layer 31 is an insulating layer and is attached to the surface of the conductive shell 201 of the battery cell 200.

[0045] Under normal operating conditions, the heated fusible layer 31 acts as an electrical isolation layer, maintaining an insulation state between the detection conductive part 30 and the battery cell 200 shell 201; when the battery pack 1000 experiences abnormal temperature rise (such as thermal runaway), the heated fusible layer 31 melts, causing structural damage, exposing the detection conductive part 30 and forming an electrical connection with the battery cell 200 shell 201.

[0046] In some embodiments, the heating film 100 further includes a detection circuit, and the battery pack 1000 includes a battery management system module. The detection conductive portion 30 is electrically connected to the battery management system module via the detection circuit. The detection circuit is configured to generate an electrical signal change when the detection conductive portion 30 is electrically connected to the housing 201 of the battery cell 200. Based on this signal change, the battery management system module determines whether the battery cell 200 is experiencing an abnormally high temperature condition and triggers a corresponding warning or protection mechanism.

[0047] Specifically, when the detection conductive portion 30 is electrically connected to the housing 201 of the battery cell 200, the voltage or current state in the detection circuit changes. This signal change can be recognized by the battery management system as an abnormal increase in the ambient temperature of the heating film 100, thereby triggering a corresponding early warning or protection mechanism. For example, an alarm signal is issued, the battery power circuit is cut off, and the cooling system is activated.

[0048] Furthermore, the present invention's technical solution fully utilizes the existing structure of the heating film body 10. Because the heating film body 10 is positioned closely to the battery cells 200, the conductive detection portion 30 can also be positioned close to the battery cells 200, improving the sensitivity and accuracy of the detection response. Furthermore, this structure does not occupy additional space within the battery pack 1000, thereby improving space utilization within the battery pack 1000.

[0049] In some technical solutions, the specific shape of the detection conductive portion 30 is not limited and can be flexibly configured based on actual application requirements. For example, the detection conductive portion 30 can adopt various geometric shapes such as rectangle, circle, ellipse, strip, or ring. It can also be designed into other irregular shapes based on the structure of the battery cell 200 or the layout of the heating film 100. As long as it can effectively cooperate with the heating fusible layer 31 and produce a change in the electrical signal when the heating fusible layer 31 responds to abnormal temperature, it can meet the functional requirements.

[0050] The shape of the conductive detection portion 30 is highly flexible, making it easier for the conductive detection portion 30 to adapt to different surface structures of the battery cell 200, such as curved, flat, or stepped surfaces, thereby improving the conformability and installation convenience of the heating film 100 and achieving a more stable and reliable detection effect.

[0051] like Figure 3 As shown, the heating film 100 according to some optional embodiments of the present invention further includes: a flexible conductive layer 50 , which is provided between the detection conductive portion 30 and the heating fusible layer 31 .

[0052] After the heated fusible layer 31 is melted due to high temperature, the flexible conductive layer 50 can provide a reliable electrical connection, thereby ensuring the stability of signal transmission between the detection conductive portion 30 and the housing 201 of the battery cell 200 .

[0053] The flexible conductive layer 50 can be fitted according to the shape of the surface of the battery cell 200 shell 201 to compensate for the small unevenness that may appear on the surface of the battery cell 200 shell 201, ensure close contact between the detection conductive part 30 and the battery cell 200 shell 201, and avoid detection blind spots.

[0054] Furthermore, the flexible conductive layer 50 is a conductive foam layer, and the heat-fusible layer 31 is a wax coating.

[0055] As can be seen, the conductive foam layer has a certain degree of flexibility. The conductive foam layer can utilize its inherent softness to conform to the surface of the battery cell 200 housing 201 or the surface shape of the area to be detected, thereby achieving a close fit between the conductive detection portion 30 and the area to be detected, reducing detection blind spots and improving detection sensitivity.

[0056] Furthermore, the conductive foam layer itself has a certain degree of elasticity and good electrical conductivity. After the fusible layer 31 melts due to the high temperature, a small gap may appear between the detection conductive portion 30 and the battery cell 200 housing 201. In this case, the conductive foam layer can fill this gap through its elastic deformation, thereby ensuring stable contact between the detection conductive portion 30 and the battery cell 200 housing 201.

[0057] Therefore, the flexible conductive layer 50 is a conductive foam layer, which helps to maintain a reliable electrical signal transmission path under abnormal temperature rise conditions, improve the stability of the electrical connection and the response consistency, thereby effectively reducing the possibility of missed reports and improving the accuracy of detection.

[0058] The wax coating serves as the heat-fusible layer 31. Once the temperature of the battery cell 200 exceeds a set safety range, the wax coating will melt rapidly, thereby exposing the conductive foam layer underneath.

[0059] In some embodiments of the present invention, the wax coating is preferably a microcrystalline wax coating with a melting point between 60°C and 75°C.

[0060] It is known that microcrystalline wax has good thermal stability, aging resistance and excellent insulation properties. It can maintain stable physical and electrical properties during the long-term operation of the heating film 100, effectively reducing the risk of false alarms.

[0061] At the same time, microcrystalline wax also has good processing adaptability, so it is easy to form a uniform and dense coating structure during the manufacturing process, further reducing the risk of false alarms.

[0062] In addition, when the battery cell 200 experiences abnormal temperature rise, the microcrystalline wax coating can melt quickly, exposing the conductive foam layer underneath, thereby triggering the detection circuit to generate electrical signal changes, enabling the identification of dangerous situations such as thermal runaway, and improving the reliability of detection.

[0063] Further optionally, the heating film 100 further includes: conductive particles wrapped in the heating fusible layer 31 .

[0064] Under normal operating conditions, the conductive particles are completely encapsulated and isolated by the heat-fusible layer 31. The conductive particles do not directly contact the battery cell 200 housing 201 or the detection conductive portion 30. The battery cell 200 housing 201 and the detection conductive portion 30 remain insulated, thus forming no conductive path.

[0065] When thermal runaway occurs, the heated fusible layer 31 melts due to the heat, and the conductive particles move closer to each other as the molten material flows, and contact the battery cell 200 shell 201 and the detection conductive part 30, forming a conductive path, thereby causing the electrical signal in the detection circuit to change, which helps to timely identify or trigger an early warning or protection mechanism.

[0066] In yet other embodiments, the conductive particles are metal powder or carbon nanotubes.

[0067] The metal powder and the carbon nanotubes have good electrical conductivity. When the fusible layer 31 begins to melt, local conduction is formed, thereby improving the detection sensitivity.

[0068] At the same time, metal powder and carbon nanotubes have good thermal stability at high temperatures and are not prone to changes in chemical or physical properties, which helps maintain the stability of their conductive properties and ensure the sensitivity and reliability of detection.

[0069] In some embodiments, the metal powder is a highly conductive material, including but not limited to silver powder, copper powder, and the like.

[0070] According to some optional embodiments of the present invention, Figure 4 As shown, the heating film body 10 includes a first insulating film 111 and a second insulating film 112 stacked together. The detection conductive portion 30 is located between the first insulating film 111 and the second insulating film 112. The heat-fusible layer 31 is provided on the side of the detection conductive portion 30 facing the first insulating film 111. The first insulating film 111 is provided with a first opening 113 corresponding to the heat-fusible layer 31.

[0071] The detection conductive part 30 is sandwiched between two layers of insulating films, which can effectively prevent it from being accidentally damaged during transportation, assembly or use, and ensure the integrity and reliability of the detection conductive part 30.

[0072] At the same time, an accidental short circuit between the detection conductive part 30 and other metal structures in the battery pack 1000 is avoided, thereby improving the electrical safety of the battery pack 1000 .

[0073] In some optional embodiments, the detection circuit is disposed between the first insulating film 111 and the second insulating film 112. This allows for integrated packaging and protection of the detection circuit and related components, while also contributing to improved structural compactness of the heating film 100 as a whole. The detection circuit can be formed using a printed circuit, a flexible circuit board, or the like, and embedded within the packaging space between the two insulating films. The structural form of the detection circuit in this application can adopt known solutions in the prior art. The detection circuit itself is not the core of this application and will not be further described here.

[0074] By opening the first insulating film 111 , the heat-fusible layer 31 can be directly exposed to the external environment and contact the surface of the battery cell 200 shell 201 to ensure that the heat-fusible layer 31 contacts the battery cell 200 shell 201 .

[0075] When thermal runaway occurs, the heated fusible layer 31 can quickly respond to temperature changes and melt, exposing the conductive foam layer or the detection conductive part 30 underneath as soon as possible, thereby forming a conductive path and achieving fast and accurate temperature monitoring.

[0076] The provision of the opening enables the heated fusible layer 31 to more directly sense the temperature change on the surface of the battery cell 200 , thereby reducing the heat conduction delay and improving the detection sensitivity.

[0077] Optionally, the shape and size of the opening can be adjusted according to specific application requirements to accommodate battery cells 200 of different shapes and sizes. This improves the versatility and adaptability of the heating film 100 and enables its application in various battery pack 1000 structures.

[0078] Specifically, the conductive detection part 30 is a sheet, the first insulating film 111 and the second insulating film 112 respectively form matching grooves 11 on the sides facing each other, the conductive detection part 30 is disposed in the matching groove 11 , and the first opening 113 is located in the matching groove 11 .

[0079] By providing the matching groove 11 , an accurate installation position can be provided for the detection conductive part 30 , thereby preventing it from being offset or misaligned during manufacturing or use, thereby ensuring the position consistency of each detection unit and improving the overall assembly accuracy.

[0080] Secondly, since the detection conductive part 30 is clamped between the two mating grooves 11 and completely wrapped in the insulating film structure, it can not only be well physically protected, but also effectively prevent the risk of short circuit with other conductive components, thereby enhancing the electrical safety of the entire heating film 100.

[0081] In addition, the detection conductive part 30 is embedded in the groove, so there will be no local protrusions or bulges above or below it, making the heating film 100 smoother as a whole and easier to fit on the surface of the battery cell 200.

[0082] At the same time, the first opening 113 has a small opening depth, that is, it only needs to penetrate the thickness of the first insulating film 111. This has the advantage of ensuring effective exposure of the heat-fusible layer 31 without significantly affecting the overall strength of the first insulating film 111.

[0083] Specific options, such as Figure 5 As shown, the heating film body 10 is in sheet shape, and the detection conductive parts 30 are multiple and arranged in rows and at intervals.

[0084] The sheet-like heating film body 10 is suitable for being attached to the surface of the battery cell 200 shell 201 to improve the detection accuracy.

[0085] Multiple detection conductive portions 30 are arranged at intervals to cover more battery cells 200. This avoids the blind spot problem caused by traditional single-point or partial area detection, allowing the heating film 100 to simultaneously monitor multiple battery cells 200 in the battery pack 1000 and improve detection coverage.

[0086] In some other optional embodiments, Figure 3 As shown, the detection conductive portion 30 is a conductive sheet 32 ​​, and a conductive wire 33 is integrally formed on each conductive sheet 32 ​​. The conductive wire 33 is used to connect to the control circuit of the heating film 100 .

[0087] The flat sheet structure adopted here can reduce the space occupied by the detection conductive part 30 in the battery pack, which is beneficial to improving the space utilization of the battery pack.

[0088] The conductive wire 33 is used to connect to the control circuit of the heating film 100. This structure integrates the conductive sheet 32 ​​and the conductive wire 33 together, and they are no longer two separately assembled components, but are manufactured in one piece.

[0089] The integrated conductive sheet 32 ​​and conductive wire 33 avoid the process complexity and connection instability problems caused by traditional welding or plugging.

[0090] Especially when the battery pack 1000 is used in a vehicle or sports equipment, which may be exposed to vibration, traditional plug-in connection methods are prone to poor contact or even disconnection, affecting signal transmission. However, the integrated molding method can greatly improve the stability of the entire circuit connection.

[0091] Secondly, this method also helps simplify the processing process. Since the conductive wire 33 and the conductive sheet 32 ​​are formed as a single piece, no additional wiring or welding steps are required. The conductive wire 33 and the conductive sheet 32 ​​can be formed simultaneously, improving production efficiency and reducing the probability of errors in the subsequent assembly process.

[0092] In the present application, the shape of the conductive sheet 32 ​​is very flexible and can be adaptively designed based on actual application requirements and the battery module structure. For example, it can be rectangular, circular, elliptical, or even strip-shaped, annular, or irregular, as long as it can cooperate with the heated fusible layer 31 and achieve stable electrical signal transmission.

[0093] Combine Figure 2 、 Figure 6 and Figure 7 A battery pack 1000 according to an embodiment of the second aspect of the present invention includes: at least one battery cell 200 and a heating film 100 according to an embodiment of the first aspect of the present invention. Each battery cell 200 includes a conductive housing 201 and an insulating protective film 202 covering the outer surface of the conductive housing 201. The insulating protective film 202 is provided with an inspection hole 203 for exposing a portion of the conductive housing 201. The heating film 100 is provided on the battery cell 200, and the heating fusible layer 31 is located in the inspection hole 203 and connected to the conductive housing 201.

[0094] By adopting the improved heating film 100 , the detection accuracy of the battery cell 200 can be improved.

[0095] By opening a detection hole 203 on the insulating protective film 202 of the battery cell 200, the heated fusible layer 31 can accurately contact the conductive shell 201, ensuring that when abnormal temperature rise occurs, the heated fusible layer 31 can respond quickly and melt, exposing the conductive foam layer or the detection conductive part 30 underneath, thereby triggering an electrical signal change and realizing early identification of dangerous situations such as thermal runaway.

[0096] Secondly, since the heating film 100 is connected to the conductive shell 201 through the detection hole 203, instead of directly destroying the entire insulating protective film 202 or exposing a large area of ​​the metal shell 201, the good insulation performance of the battery cell 200 shell can still be maintained under normal working conditions, avoiding unnecessary leakage current or short circuit risks, and improving the safety and stability of the battery pack 1000.

[0097] Furthermore, this structure facilitates the installation and attachment of the heating film 100. The heating film 100 remains flat overall, connecting to the battery cell 200 only in the detection hole 203 area. This does not affect the overall packaging structure of the battery cell 200, nor does it excessively damage the original insulating protective film 202, thus helping to maintain the sealing and reliability of the battery cell 200.

[0098] In this embodiment, the location of the detection hole 203 can be arranged according to the structural characteristics and heat distribution of the battery cell 200, and this application does not impose any specific restrictions. For example, the detection hole 203 can be set on the top, side, or other areas prone to heat generation of the battery cell 200. This allows the detection conductive portion 30 to more effectively sense local hot spots, thereby improving the pertinence and sensitivity of temperature detection.

[0099] An electric device according to an embodiment of a third aspect of the present invention includes the battery pack 1000 according to an embodiment of the second aspect of the present invention.

[0100] It should be noted that the electrical equipment referred to here includes but is not limited to new energy vehicles, power tools, ships, spacecraft, etc. Among them, new energy vehicles can be pure electric vehicles, extended-range vehicles, etc. Specifically, a battery pack 1000 is provided in the vehicle. Here, the battery pack 1000 can be used to power the vehicle. For example, the battery pack 1000 can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery pack 1000 to power the motor, for example, for the vehicle's starting, navigation, and working power requirements during driving. In some embodiments of the present application, the battery pack 1000 can not only serve as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0101] Reference below Figure 1 - Figure 5The heating film 100 according to the embodiment of the present invention is described in detail with reference to a specific embodiment. It should be understood that the following description is only for illustrative purposes and is not intended to limit the present invention.

[0102] Reference Figure 1-Figure 3 The heating film 100 includes: a heating film body 10 , a detection conductive part 30 , and a flexible conductive layer 50 .

[0103] The heating film body 10 is in a sheet shape and includes a first insulating film 111 and a second insulating film 112 that are stacked.

[0104] Reference Figure 5 The conductive detection portion 30 is a plurality of conductive detection portions 30 arranged in a row and spaced apart. The conductive detection portion 30 is a sheet.

[0105] Reference Figure 4 Each detection conductive portion 30 is located between the first insulating film 111 and the second insulating film 112 .

[0106] The first insulating film 111 and the second insulating film 112 respectively form a matching groove 11 on one side facing each other, and the detection conductive part 30 is provided in the matching groove 11 .

[0107] The detection conductive part 30 is used to be arranged on the conductive shell 201 of the battery cell 200. A heat-fusible layer 31 is provided on the side facing the battery cell 200. The heat-fusible layer 31 is an insulating layer and is provided on the side of the detection conductive part 30 facing the first insulating film 111.

[0108] A first opening 113 corresponding to the heat-fusible layer 31 is formed on the first insulating film 111 . The first opening 113 is located in the matching groove 11 .

[0109] The detection conductive portion 30 is a conductive sheet 32 ​​. A conductive wire 33 is integrally formed on each conductive sheet 32 ​​. The conductive wire 33 is used to connect to the control circuit of the heating film 100 .

[0110] The flexible conductive layer 50 is provided between the detection conductive portion 30 and the heat-fusible layer 31 .

[0111] The flexible conductive layer 50 is a conductive foam layer, and the heat-fusible layer 31 is a wax coating.

[0112] Other components of the heating film 100 according to the embodiment of the present invention, such as the conductive sheet 32 ​​and the operation thereof, are well known to those skilled in the art and will not be described in detail here.

[0113] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0114] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A heating film, characterized in that: include: Heating film body; The detection conductive part is arranged on the heating film body. The detection conductive part is provided with a heating fusible layer on the side facing the battery core. The heating fusible layer is an insulating layer and is used to be arranged on the conductive shell of the battery core.

2. The heating film according to claim 1, characterized in that Also includes: A flexible conductive layer is provided between the detection conductive portion and the heating fusible layer.

3. The heating film according to claim 2, characterized in that The flexible conductive layer is a conductive foam layer, and the heat-fusible layer is a wax coating.

4. The heating film according to claim 1, characterized in that The heating film further comprises conductive particles wrapped in the heating fusible layer.

5. The heating film according to claim 4, characterized in that The conductive particles are metal powder or carbon nanotubes.

6. The heating film according to any one of claims 1 to 5, characterized in that The heating film body comprises: a first insulating film and a second insulating film which are stacked; The detection conductive portion is located between the first insulating film and the second insulating film, and the heat-fusible layer is provided on a side of the detection conductive portion facing the first insulating film; The first insulating film is provided with a first opening corresponding to the heat-fusible layer.

7. The heating film according to claim 6, characterized in that The conductive detection part is a sheet, the first insulating film and the second insulating film respectively form matching grooves on the sides facing each other, the conductive detection part is arranged in the matching groove, and the first opening is located in the matching groove.

8. The heating film according to claim 6, characterized in that The heating film body is in sheet shape, and the detection conductive parts are multiple and arranged in rows and at intervals.

9. The heating film according to any one of claims 1 to 5, characterized in that: The detection conductive part is a conductive sheet, and each conductive sheet is integrally formed with a conductive wire, and the conductive wire is used to be connected to the control circuit of the heating film.

10. A battery pack, characterized in that: include: At least one battery cell, each of the battery cells comprising a conductive shell and an insulating protective film covering an outer surface of the conductive shell, wherein the insulating protective film is provided with a detection hole for exposing a portion of the conductive shell; The heating film according to any one of claims 1 to 9, wherein the heating film is provided on the battery core, and the heating fusible layer is located in the detection hole and connected to the conductive shell.

11. An electrical device, characterized in that: Comprising the battery pack according to claim 10.

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