Heating film and battery

Abstract

The utility model discloses a heating film and a battery. The utility model relates to the technical field of batteries, and solves or relieves the problem of poor heating effect of a heating film of a battery. The heating film is used for heating the battery cells. The heating film comprises an insulating layer, a heating wire and a heat conduction layer, the heating wire is at least partially embedded into the heat conduction layer, the insulating layer covers one surface, on which the heating wire is arranged, of the heat conduction layer, and the heat conduction layer is configured to conduct heat generated by the heating wire to the battery monomer under the condition that the heating wire is electrified and emits heat. The heating film can cover the surface of the battery to heat the battery, the heat conduction layer conducts heat generated by the heating wire to the surface of the battery, the contact area between the heat conduction layer and the single battery is large, heating is uniform and efficient, and therefore the working temperature of the battery can be adjusted, and the good working performance of the battery is kept.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a heating film and a battery. Background Art

[0002] When the power battery works at too low a temperature, the charging and discharging performance will decrease. In the related technology, a conductive heating element is used to heat the battery. The contact area between the heating element and the battery surface is limited, which may cause problems such as uneven heating and low heating efficiency. Utility Model Content

[0003] In view of the above problems, the present application provides a heating film and a battery, which can solve or alleviate the problem of poor heating effect of the heating film of the battery.

[0004] In a first aspect, the present application provides a heating film, which is used to heat a battery cell. The heating film comprises an insulating layer, a heating wire and a heat-conducting layer, wherein the heating wire is at least partially embedded in the heat-conducting layer, the insulating layer covers a side of the heat-conducting layer on which the heating wire is arranged, and the heat-conducting layer is configured to conduct the heat generated by the heating wire to the battery cell when the heating wire is powered on and generates heat.

[0005] The above-mentioned heating film can cover the surface of the battery to heat the battery. The thermal conductive layer conducts the heat generated by the heating wire to the battery surface. The contact area between the thermal conductive layer and the battery cell is large, and the heating is uniform and efficient, thereby adjusting the operating temperature of the battery, so that the battery maintains good working performance.

[0006] According to some embodiments of the present application, the heat-conducting layer defines a mounting groove, and the heating wire is at least partially accommodated in the mounting groove so that the heating wire is at least partially embedded in the heat-conducting layer.

[0007] In the above embodiment, the heat-conducting layer is provided with an installation groove, and the heating wire can be positioned and installed through the installation groove and the heat-conducting layer when it is installed. After the heating wire and the heat-conducting layer are installed, the insulating layer is encapsulated on the side of the heat-conducting layer where the heating wire is exposed, and the installation of the heating film can be completed. The installation method is simple and fast. Furthermore, after the heating wire is accommodated in the installation groove, the contact area between the heating wire and the installation groove is increased, thereby improving the heating efficiency of the heat-conducting layer.

[0008] According to some embodiments of the present application, the mounting groove is zigzag.

[0009] In the above embodiment, the installation groove is zigzag arranged on the heat conductive layer, and the heating wire can be installed according to the position of the installation groove, thereby increasing the contact area of ​​the heating wire with the heat conductive layer, thereby improving the heating efficiency of the heating wire on the heat conductive layer.

[0010] According to some embodiments of the present application, the mounting groove and the heating wire are interference fit.

[0011] In the above embodiment, the mounting groove and the heating wire are interference fit, that is, at the contact portion of the mounting groove and the heating wire, the two are in close contact, thereby fixing the position of the heating wire in the heat conductive layer. At the same time, it is ensured that the portion of the heating wire in the mounting groove is in full contact with the mounting groove, which is beneficial to heat conduction and improves heating efficiency.

[0012] According to some embodiments of the present application, the thermally conductive layer includes a silicone thermally conductive layer, and the silicone thermally conductive layer and the mounting groove are formed by an integral molding process.

[0013] In the above embodiment, the thermal conductivity of the silicone thermal conductive layer is good, and the silicone thermal conductive layer is easy to process and shape. At the same time, the silicone thermal conductive layer and the mounting groove can be simultaneously formed through a corresponding mold. Therefore, the thermal conductive layer has fewer processing steps, a simple processing method and small processing errors.

[0014] According to some embodiments of the present application, the heating wire is zigzag.

[0015] In the above embodiment, the heating wire is zigzag and can be matched with the zigzag installation groove, or can be directly adhered and fixed on the heat conductive layer, thereby increasing the contact area of ​​the heating wire with the heat conductive layer, thereby improving the heating efficiency of the heating wire on the heat conductive layer.

[0016] According to some embodiments of the present application, a radial cross-section of the heating wire is circular.

[0017] In the above embodiment, the radial cross section of the heating wire is circular, and after the heating wire is accommodated in the installation groove, the contact area with the installation groove is large, which can increase the contact area between the heating wire and the heat conductive layer. At the same time, the circular radial cross section of the heating wire can enhance the overall structural strength of the heating wire, so that the heating wire is less deformed, damaged and broken during transportation and processing.

[0018] According to some embodiments of the present application, the heating film includes plug-in terminals, which are electrically connected to the heating wire and an external power source respectively.

[0019] In the above embodiment, the plug terminal is connected to the heating wire, and the plug terminal is electrically connected to the heating wire. When the plug terminal is connected to an external power source, the heating wire is energized and heated, which can heat the heat conductive layer, thereby increasing the temperature of the heat conductive layer and heating the surface of the battery cell.

[0020] In a second aspect, the present application provides a battery, comprising a heating film according to any one of the above embodiments and a battery cell, wherein the heating film is arranged on a surface of the battery cell, and a heat conductive layer of the heating film is in direct contact with the surface of the battery cell.

[0021] In the above battery, the heating film can cover the surface of the battery to heat the battery, and the heat conductive layer conducts the heat generated by the heating wire to the battery surface, thereby adjusting the operating temperature of the battery, so that the battery maintains good working performance.

[0022] According to some embodiments of the present application, the heating film is disposed on a side of the battery cell.

[0023] In the above embodiment, the heating film is in direct contact with the side of the battery cell, which can quickly adjust the operating temperature of the battery cell, thereby maintaining good working performance of the battery.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0027] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0028] Figure 3 This is a schematic diagram of the exploded structure of the heating film of some embodiments of the present application;

[0029] Figure 4 A schematic cross-sectional view of a heating film according to some embodiments of the present application;

[0030] Figure 5 Another cross-sectional schematic diagram of a heating film according to some embodiments of the present application;

[0031] Figure 6 Another schematic diagram of the exploded structure of the heating film according to some embodiments of the present application;

[0032] Figure 7 This is a schematic diagram of the structure of the heat-conducting layer in some embodiments of the present application;

[0033] Figure 8 This is a schematic diagram of the structure of the heating wire in some embodiments of the present application;

[0034] Fig. 9 This is a schematic diagram of the structure of the heating film in some embodiments of the present application;

[0035] Fig.10 Another schematic diagram of the structure of the heating film according to some embodiments of the present application.

[0036] The reference numerals in the specific implementation manner are as follows:

[0037] Vehicles 1000;

[0038] Battery 100, controller 200, motor 300;

[0039] Box body 10, first part 11, second part 12;

[0040] Battery cell 20;

[0041] Heating film 30 , insulating layer 301 , heating wire 302 , heat conducting layer 303 , mounting groove 3031 , plug-in terminal 304 . DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0051] Power batteries are one of the power sources for new energy vehicles. During vehicle operation, they face complex and changeable operating conditions. Among them, temperature is one of the most important factors affecting power battery operating conditions.

[0052] In low temperature environment, the performance of power battery will decline, which is mainly manifested in longer charging time, reduced charging and discharging amount, smaller battery capacity or too fast power loss, etc. Therefore, new energy vehicles are inconvenient to use in low temperature environment.

[0053] In addition, temperature factors also have a key impact on the performance, life and safety of vehicle batteries, especially in low temperature conditions. The low temperature performance of the battery system is greatly affected by problems such as increased internal resistance and reduced capacity caused by changes in the electrochemical environment.

[0054] In the related art, a conductive heating element is used to heat the battery. The contact area between the heating element and the battery surface is limited, which may cause problems such as uneven heating and low heating efficiency.

[0055] Based on the above considerations, in order to solve or alleviate the problem of poor heating effect of a heating film of a battery, the present application provides a heating film for heating a battery cell.

[0056] The heating film comprises an insulating layer, a heating wire and a heat-conducting layer. The heating wire is at least partially embedded in the heat-conducting layer, and the insulating layer covers one side of the heat-conducting layer where the heating wire is arranged.

[0057] The heat-conducting layer is configured to conduct heat generated by the heating wire to the battery cell when the heating wire is energized and generates heat.

[0058] In such a heating film, the heating film can cover the surface of the battery to heat the battery. The thermal conductive layer conducts the heat generated by the heating wire to the battery surface. The contact area between the thermal conductive layer and the battery cell is large, and the heating is uniform and efficient, thereby adjusting the operating temperature of the battery to maintain good working performance.

[0059] The heating film can be applied to batteries to heat the battery cells in the batteries.

[0060] The battery mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0061] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0062] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0063] In some embodiments, the battery may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0064] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0065] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0066] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be an upper cover or a bottom plate.

[0067] As an example, the box body may include an upper cover, a frame and a bottom plate. The upper cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0068] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0069] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0070] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0071] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0072] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a closed space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a closed space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 covers or buckles the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a closed space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers or buckles the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0074] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0075] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0076] According to some embodiments of the present application, Figures 3 to 7 As shown, the present application provides a heating film 30 , which is used to heat the battery cell 20 .

[0077] The heating film 30 comprises an insulating layer 301 , a heating wire 302 and a heat-conducting layer 303 . The heating wire 302 is at least partially embedded in the heat-conducting layer 303 . The insulating layer 301 covers one side of the heat-conducting layer 303 on which the heating wire 302 is arranged.

[0078] The heat conductive layer 303 is configured to conduct heat generated by the heating wire 302 to the battery cell 20 when the heating wire 302 is powered on and generates heat.

[0079] The heating film 30 can cover the surface of the battery to heat the battery, and the heat conductive layer 303 conducts the heat generated by the heating wire 302 to the battery surface, thereby adjusting the operating temperature of the battery, so that the battery maintains good working performance.

[0080] Specifically, the heating film 30 includes an insulating layer 301 , a heating wire 302 and a heat-conducting layer 303 . The heating wire 302 is used to generate heat when powered on, thereby heating the heat-conducting layer 303 .

[0081] The heating wire 302 is at least partially embedded in the heat conducting layer 303 , and the insulating layer 301 covers one side of the heat conducting layer 303 where the heating wire 302 is arranged. The heating wire 302 is in direct contact with the heat conducting layer 303 , so that the heating wire 302 can transfer heat to the heat conducting layer 303 .

[0082] It should be noted that the heating wire 302 is at least partially embedded in the heat-conducting layer 303, that is, the degree to which the heating wire 302 is embedded in the heat-conducting layer 303 is different, such as Figure 4 As shown, part of the heating wire 302 is embedded in the heat conducting layer 303. Alternatively, as shown in FIG. Figure 5 As shown, the heating wire 302 is substantially completely embedded in the heat-conducting layer 303. In this way, the contact area between the heating wire 302 and the heat-conducting layer 303 is larger, and at the same time, the heat-conducting layer 303 protects the heating wire 302.

[0083] It is understandable that the insulating layer 301 covers the side of the heat conductive layer 303 where the heating wire 302 is arranged, that is, the insulating layer 301 covers the heat conductive layer 303 in the arrangement direction of the heating wire 302. The insulating layer 301 overlaps with the heat conductive layer 303 to isolate, protect and insulate the heating wire 302.

[0084] Optionally, the material of the insulating layer 301 includes polyimide film, PET polymer, electric heating film insulating paste and other insulating materials.

[0085] In one embodiment, the insulating layer 301 includes a polyimide film, which is a high temperature resistant organic polymer film with excellent mechanical properties, electrical properties, chemical stability, high radiation resistance, high temperature resistance and low temperature resistance (-269°C to +400°C). When applied to the heating film 30, the polyimide film can maintain a stable state at different temperatures and can effectively protect the heating wire 302.

[0086] In the related art, a heating film is attached to the surface of the battery cell 20, and the heating film is controlled to be energized to generate heat to heat the battery cell 20, thereby controlling the temperature of the battery cell 20, thereby ensuring that the battery system can operate at a suitable temperature.

[0087] The heating part of the heating film is generally a sheet of copper foil, and both sides are encapsulated with an insulating protective film. When in use, the heating film is attached to the surface of the battery cell 20, and the copper foil is energized to heat the copper foil, thereby heating the surface of the battery cell 20.

[0088] However, since the length and width of the sheet copper foil are large and the thickness is extremely small, the copper foil is easily damaged or folded somewhere during transportation and processing, resulting in inconsistent dimensions of the copper foil in length, width or thickness. In this way, after power is turned on, the resistance of the sheet copper foil will be inconsistent at various locations, which may cause uneven heating of the sheet copper foil, and eventually cause the sheet copper foil to melt from the damaged location, resulting in failure of the heating function.

[0089] In addition, since the sheet copper foil of the heating film is encapsulated between two layers of insulating protective films, the thickness of the heating film is inconsistent. When it is pasted to the surface of the battery cell 20, it may not fit tightly with the surface of the battery cell 20, which may cause dry burning and deteriorate the heating effect of the heating film.

[0090] See also Figure 4 and Figure 5 According to some embodiments of the present application, the heat conductive layer 303 defines a mounting groove 3031 , and the heating wire 302 is at least partially accommodated in the mounting groove 3031 so that the heating wire 302 is at least partially embedded in the heat conductive layer 303 .

[0091] The heat conducting layer 303 is provided with an installation groove 3031 , and the installation groove 3031 is used to install the heating wire 302 . Optionally, the heating wire 302 can be partially accommodated in the installation groove 3031 , or the heating wire 302 can be completely accommodated in the installation groove 3031 .

[0092] The mounting groove 3031 has the functions of positioning, assisting installation and fixing the heating wire 302. The heating wire 302 can be embedded in the mounting groove 3031 according to the shape of the mounting groove 3031, without the need for other positioning devices to assist installation, which can improve the processing efficiency of the heating film 30.

[0093] The heating wire 302 is at least partially accommodated in the mounting groove 3031 and can be fixed in the mounting groove 3031 by thermal conductive glue or other media. In this way, the area of ​​thermal contact between the heating wire 302 and the mounting groove 3031 can be large, which is beneficial for the heating wire 302 to transfer heat to the thermal conductive layer 303.

[0094] The heat-conducting layer 303 converts the "wire" heat source of the heating wire 302 into a "surface" heat source. The entire bottom surface of the heat-conducting layer 303 contacts the battery cell 20, and the heating area is increased. Compared with the polyimide film encapsulated on both sides of the copper foil sheet, the thermal conductive silicone pad has better thermal conductivity than the polyimide film and better thermal conductivity effect.

[0095] In one embodiment, the heating wire 302 includes a metal wire, and the processing steps of the heating film 30 are as follows: the incoming metal wire is in a straight line shape, and is embedded in a tooling mold corresponding to the shape of the mounting groove 3031 according to the required shape to form a heating wire 302 structure of the required shape, and finally embedded in the mounting groove 3031 of the thermal conductive layer 303. The insulating film is hot-pressed on one side of the thermal conductive layer 303 where the heating wire 302 is embedded, to obtain the final product.

[0096] In the above embodiment, the heat conductive layer 303 is provided with an installation groove 3031, and the heating wire 302 can be positioned and installed through the installation groove 3031 and the heat conductive layer 303. After the heating wire 302 and the heat conductive layer 303 are installed, the insulating layer 301 is encapsulated on the side of the heat conductive layer 303 where the heating wire 302 is exposed, and the installation of the heating film 30 is completed. The installation method is simple and fast.

[0097] Furthermore, after the heating wire 302 is accommodated in the mounting groove 3031 , the contact area between the heating wire 302 and the mounting groove 3031 is increased, thereby improving the heating efficiency of the heat-conducting layer 303 .

[0098] According to some embodiments of the present application, the mounting groove 3031 is zigzag.

[0099] Optionally, the mounting groove 3031 is linearly and tortuously opened on the heat-conducting layer 303; or, the mounting groove 3031 is spirally and tortuously opened on the heat-conducting layer 303; or, the mounting groove 3031 can be opened on the heat-conducting layer 303 in other tortuous arrangements.

[0100] In this way, after the heating wire 302 is embedded in the installation groove 3031 , it can cover the heat-conducting layer 303 as much as possible, thereby improving the energy density and temperature uniformity of the heat-conducting layer 303 and avoiding temperature differences at different positions during heating.

[0101] In the above embodiment, the installation groove 3031 is zigzagly arranged on the heat-conducting layer 303, and the heating wire 302 can be installed according to the position of the installation groove 3031, thereby increasing the contact area of ​​the heating wire 302 with the heat-conducting layer 303, thereby improving the heating efficiency of the heating wire 302 on the heat-conducting layer 303.

[0102] According to some embodiments of the present application, the mounting groove 3031 is interference fit with the heating wire 302 .

[0103] When processing the installation groove 3031, the installation groove 3031 can be designed according to the size parameters of the heating wire 302, so that when the heating wire 302 is installed in the installation groove 3031, the installation groove 3031 and the heating wire 302 have an interference fit. In this way, on the one hand, the heating wire 302 can be fixed by the installation groove 3031, and there is no need to use other methods to fix the heating wire 302, which can simplify the installation steps; on the other hand, the heating wire 302 is in close contact with the installation groove 3031, which is conducive to heat conduction.

[0104] In one embodiment, the heat-conducting layer 303 includes a silicone pad. When the heating wire 302 and the heat-conducting layer 303 are installed, the heating wire 302 is first placed on the silicone pad, and then the heating wire 302 is controlled to generate heat, and downward pressure is applied to the heating wire 302. After the temperature of the heating wire 302 reaches the melting temperature of the silicone pad, the heating wire 302 can be embedded in the silicone pad, and the insulating film is hot-pressed on one side of the heat-conducting layer 303 where the heating wire 302 is embedded, to obtain the final product. In this way, the same effect as installing the heating wire 302 by opening the installation groove 3031 is achieved. At the same time, using the above method, the heating wire 302 can be directly fixed in the silicone pad and completely fit with the silicone pad.

[0105] On the one hand, the heating wire 302 and the heat-conducting layer 303 can be closely attached to each other, thereby improving the heating efficiency of the heat-conducting layer 303 by the heating wire 302 ; on the other hand, the heat-conducting layer 303 has a fixing effect on the heating wire 302 , thereby ensuring that the heating wire 302 will not separate from the heat-conducting layer 303 .

[0106] It should be noted that, in the above embodiment, the covering surface of the insulating layer 301 is the surface of the heat-conducting layer 303 where the heating wire 302 is embedded.

[0107] In the above embodiment, the mounting groove 3031 and the heating wire 302 are interference fit, that is, at the contact portion of the mounting groove 3031 and the heating wire 302, the two are in close contact, thereby fixing the position of the heating wire 302 in the heat conductive layer 303, and at the same time, ensuring that the portion of the heating wire 302 in the mounting groove 3031 is in full contact with the mounting groove 3031, which is beneficial to heat conduction and improves heating efficiency.

[0108] According to some embodiments of the present application, the heat-conducting layer 303 includes a silicone heat-conducting layer 303 , and the silicone heat-conducting layer 303 and the mounting groove 3031 are formed by an integral molding process.

[0109] The heat conducting layer 303 includes a silicone heat conducting layer 303. First, the thermal conductivity of the silicone heat conducting pad can reach 5W / mK or above. This high thermal conductivity enables the silicone heat conducting pad to effectively conduct heat away from the heat source.

[0110] Secondly, the thermal resistance of silicone thermal pads is relatively low, which is conducive to improving the overall heat conversion capacity of silicone thermal pads. The low thermal resistance property enables silicone thermal pads to reduce heat loss during the heat dissipation process and improve heat dissipation efficiency.

[0111] In addition, the silicone thermal pad has good compressibility and flexibility as well as excellent insulation and pressure resistance. It is easy to process and install. At the same time, the surface has a certain degree of stickiness, which makes it easy to fit on the heating components.

[0112] When manufacturing the silicone heat-conducting layer 303, a silicone heat-conducting layer 303 mold with the mounting groove 3031 can be manufactured in advance, and then the silicone raw material is poured into the silicone heat-conducting layer 303 mold to directly obtain the silicone heat-conducting layer 303 with the mounting groove 3031. In this way, the manufacturing process of the heat-conducting layer 303 can be reduced, and the manufacturing can be convenient and fast.

[0113] In other embodiments, the heat-conducting layer 303 is not limited to the silicone heat-conducting layer 303 , and any heat-conducting material can be selected to be processed into the heat-conducting layer 303 .

[0114] In the above embodiment, the thermal conductivity of the silicone thermal conductive layer 303 is good, and the silicone thermal conductive layer 303 is easy to process and shape. At the same time, the silicone thermal conductive layer 303 and the installation groove 3031 can be simultaneously formed through a corresponding mold. Therefore, the thermal conductive layer 303 has fewer processing steps, a simple processing method and a small processing error.

[0115] See also Figures 8 to 10 According to some embodiments of the present application, the heating wire 302 is zigzag.

[0116] Optionally, the heating wire 302 is arranged in a linear and tortuous manner; or, the heating wire 302 is arranged in a spiral and tortuous manner; or, the heating wire 302 can be arranged in other tortuous arrangements.

[0117] In this way, the heating wire 302 can cover as much of the heat-conducting layer 303 as possible, thereby improving the energy density and temperature uniformity of the heat-conducting layer 303 and avoiding temperature differences at different positions during heating.

[0118] Optionally, the heating wire 302 includes a plurality of resistance wires, and the plurality of resistance wires are arranged at intervals from each other. Fig. 9As shown, the multiple resistance wires of the heating wire 302 can be parallel, and the ends of the multiple resistance wires can be conductively connected. Further, the multiple resistance wires can be integrally formed. In this way, the arrangement of the heating wire 302 is facilitated.

[0119] Alternatively, if Fig.10 As shown, the heating wire 302 is arranged horizontally and reciprocatingly on the heat-conducting layer 303, and finally the two ends of the heating wire 302 are led out from the same side to connect to an external power source. In this way, the contact area between the heating wire 302 and the heat-conducting layer 303 can be increased, and the structure of the heating wire 302 is simple and easy to install.

[0120] In the above embodiment, the heating wire 302 is zigzag and can be matched with the zigzag installation groove 3031, or can be directly adhered and fixed on the heat conductive layer 303, thereby increasing the contact area of ​​the heating wire 302 with the heat conductive layer 303, thereby improving the heating efficiency of the heating wire 302 on the heat conductive layer 303.

[0121] According to some embodiments of the present application, a radial cross section of the heating wire 302 is circular.

[0122] The heating wire 302 with a circular radial cross section has good thermal conductivity, and the circular cross section can provide more uniform heat distribution during the heating process. Due to the symmetry of the circle, the heat can be evenly spread along the circumference of the heating wire 302, and the heat is spread more evenly on the heating wire 302, which helps to reduce the problem of local overheating or uneven cooling of the heating wire 302, thereby improving the thermal efficiency.

[0123] At the same time, the circular cross-section can better disperse stress and reduce the risk of breakage caused by high temperature or mechanical stress. Therefore, the heating wire 302 with a circular cross-section usually has higher strength and durability.

[0124] The heating wire 302 structure with a circular radial cross section is used to replace the sheet copper foil structure. The tensile and tearing resistance of the cross section of the heating wire 302 is improved, which can improve the problem of damage to the heating wire 302 due to tearing during transportation, processing and assembly.

[0125] The heating wire 302 may include a metal wire. During processing, metal wires of different specifications may be selected according to requirements, and the mounting groove 3031 may be set according to the specifications and dimensions of the metal wire.

[0126] In addition, the heating wire 302 does not need to be processed by die cutting or etching, which greatly reduces the process cost. The circular cross section is easier to achieve during the manufacturing process, whether through drawing, cutting or other processing methods, the heating wire 302 with a circular cross section is easier to obtain.

[0127] In the above embodiment, the radial cross section of the heating wire 302 is circular, and after the heating wire 302 is accommodated in the installation groove 3031, the contact area with the installation groove 3031 is large, which can increase the contact area between the heating wire 302 and the heat conductive layer 303. At the same time, the circular radial cross section of the heating wire 302 can enhance the overall structural strength of the heating wire 302, so that the heating wire 302 is less deformed, damaged and broken during transportation and processing.

[0128] See also Figure 3 According to some embodiments of the present application, the heating film 30 includes a plug-in terminal 304 , which is electrically connected to the heating wire 302 and an external power source respectively.

[0129] One end of the plug terminal 304 is electrically connected to the heating wire 302, and the other end is connected to the external power supply. After the external power supply is powered on, the heating wire 302 starts to heat up and transfers heat to the heat conducting layer 303. The heating wire 302 is electrically connected to the plug terminal 304, which facilitates the quick connection of the heating wire 302 with different external power supplies.

[0130] Optionally, the plug terminal 304 can be electrically connected to the interface of the battery management system, and the battery management system controls the power on and off of the heating film 30. In this way, the operating temperature of the battery cell 20 can be adjusted more accurately, which is conducive to keeping the operating temperature of the battery cell 20 within a suitable range.

[0131] In the above embodiment, the plug terminal 304 is connected to the heating wire 302, and the plug terminal 304 is electrically connected to the heating wire 302. When the plug terminal 304 is connected to an external power source, the heating wire 302 is energized to generate heat, which can heat the heat conductive layer 303, thereby increasing the temperature of the heat conductive layer 303 and heating the surface of the battery cell 20.

[0132] In summary, the heating film 30 provided by the present application has improved electrical safety performance: (1) The heating structure design in which the heating wire 302 is embedded in the heat-conducting layer 303 avoids the problem of uneven heating caused by damage to the sheet copper foil compared to the sheet copper foil heating film 30;

[0133] (2) The radial cross section of the heating wire 302 is circular. Compared with the sheet-like copper foil structure, the tensile and tearing resistance of the cross section of the heating wire 302 is improved, which can improve the problem of damage to the heating wire 302 caused by tearing during transportation, processing and assembly.

[0134] (3) The heat conductive layer 303 is bonded to the battery cell 20. Compared with the polyimide film laminated on both sides of the sheet copper foil, the bonding surface has better flatness, a larger bonding area, and enhanced bonding strength, which can avoid the problem of dry burning of the heating film 30 caused by poor bonding at the pasting position.

[0135] Secondly, the thermal conductivity of the heating film 30 is improved: (1) The heat conductive layer 303 converts the "line" heat source of the heating wire 302 into a "surface" heat source. The entire bottom surface of the heat conductive layer 303 is in contact with the battery cell 20, and the heating area is increased;

[0136] (2). The thermal conductivity of the thermal conductive layer 303 is better than that of the polyimide film encapsulated on the surface of the sheet copper foil, and the thermal conductivity effect is better.

[0137] Finally, the heating film 30 has a cost advantage: the heating wire 302 with a circular radial cross section does not need to be processed by die cutting or etching, and the process cost is greatly reduced.

[0138] The heating film 30 in the related art generally uses a sheet of copper foil with insulating protective films encapsulated on both sides. In this way, the heating film 30 is attached to the surface of the battery cell 20 to heat the battery cell 20 through the sheet of copper foil.

[0139] The heating film 30 of the present application uses a heating wire 302 to heat the thermal conductive layer 303. The thermal conductive layer 303 is in full contact with the surface of the battery cell 20. The thermal conductive layer 303 heats the surface of the battery cell 20. In this way, the heating area is larger, the temperature difference at various locations on the surface of the battery cell 20 is small, and the heating is more uniform.

[0140] In a second aspect, the present application provides a battery 100 , which includes a heating film 30 and a battery cell 20 according to any of the above embodiments, wherein the heating film 30 is disposed on the surface of the battery cell 30 , and the heat conductive layer 303 of the heating film 30 is in direct contact with the surface of the battery cell 30 .

[0141] The battery 100 may be any of the aforementioned devices or systems to which the heating film 30 is applied.

[0142] In the above-mentioned battery 100, the heating film 30 can cover the surface of the battery to heat the battery, and the heat conductive layer 303 conducts the heat generated by the heating wire 302 to the battery surface, thereby adjusting the operating temperature of the battery, so that the battery maintains good working performance.

[0143] According to some embodiments of the present application, the heating film 30 is disposed on a side of the battery cell 20 .

[0144] In the above embodiment, the heating film 30 is in direct contact with the side of the battery cell 20 , and the operating temperature of the battery cell 20 can be quickly adjusted, so that the battery 100 maintains good working performance.

[0145] The battery cell 20 includes a large surface and a side surface. When the battery 100 includes a plurality of battery cells 20, the large surfaces of the plurality of battery cells 20 are arranged in contact with each other to form a battery module. The battery 100 includes at least one battery module.

[0146] The heating film 30 is disposed on the side of the plurality of battery cells 20 and is in direct contact with each of the battery cells 20 .

[0147] Optionally, a heating film 30 is provided in a battery module, and the heating film 30 is provided on one side of the battery module, directly contacting one side of each battery cell 20. In this way, the heating film 30 occupies less space in the battery module, and has less impact on the overall volume of the battery module.

[0148] Optionally, a heating film group is provided in a battery module, and the heating film group includes two heating films 30, and the two heating films 30 can be electrically connected to realize synchronous opening or closing, or the two heating films 30 can be electrically connected to an external power supply respectively, so that each heating film 30 can work independently. The two heating films 30 are respectively arranged on both sides of the battery module, and directly contact the two sides of each battery cell 20. In this way, the contact area between the heating film 30 and the battery cell 20 can be made larger, and the heating efficiency can be higher.

[0149] exist Figure 2 In the battery 100 shown, the battery 100 includes three battery modules. The battery modules and the heating films are packaged in a box 10. A heating film 30 or a heating film group can be provided on the side of each battery module.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A heating film for heating a battery cell, characterized in that: The heating film includes an insulating layer, a heating wire and a heat-conducting layer. The heating wire is at least partially embedded in the heat-conducting layer. The insulating layer covers a side of the heat-conducting layer on which the heating wire is arranged. The heat-conducting layer is configured to conduct the heat generated by the heating wire to the battery cell when the heating wire is energized and generates heat.

2. The heating film according to claim 1, characterized in that: The heat-conducting layer is provided with a mounting groove, and the heating wire is at least partially accommodated in the mounting groove so that the heating wire is at least partially embedded in the heat-conducting layer.

3. The heating film according to claim 2, characterized in that: The installation groove is zigzag.

4. The heating film according to claim 2, characterized in that: The mounting groove is interference-fitted with the heating wire.

5. The heating film according to claim 2, characterized in that: The heat-conducting layer comprises a silicone heat-conducting layer, and the silicone heat-conducting layer and the mounting groove are manufactured and formed by an integral molding process.

6. The heating film according to claim 1, characterized in that: The heating wire is in a zigzag shape.

7. The heating film according to claim 1, characterized in that: The radial cross section of the heating wire is circular.

8. The heating film according to claim 1, characterized in that: The heating film comprises plug-in terminals, which are electrically connected to the heating wire and an external power source respectively.

9. A battery, characterized in that: The invention comprises the heating film according to any one of claims 1 to 8 and a battery cell, wherein the heating film is arranged on the surface of the battery cell, and the heat-conducting layer of the heating film is in direct contact with the surface of the battery cell.

10. The battery according to claim 9, characterized in that The heating film is arranged on a side surface of the battery cell.

Images