Battery and power consuming device

Abstract

The utility model relates to the technical field of electric core heating, specifically relates to a battery and electric equipment. In the battery, the positive pole and the negative pole of the electric core are connected with the heating film, and at least one of the positive pole and the heating film and the negative pole and the heating film is provided with an on-off power controller, the on-off power controller can control the heating film and the electric core to form a passage or a circuit based on the control signal of the battery management system, when the on-off power controller controls the heating film and the electric core to form a passage, the heating film can be electrified and heat the outer peripheral part of the electric core. Since each electric core can be electrified and heated by the corresponding heating film in each power supply unit, each electric core can be kept consistent with the temperature of other electric cores by the way of independent heating and warming, so as to avoid the temperature difference between different electric cores, and the temperature of all power supply units can be kept in the target range, so that the temperature consistency of the whole battery is kept well.

Description

Technical Field

[0001] This utility model relates to the field of battery cell heating technology, specifically to a battery and an electrical device. Background Technology

[0002] The battery consists of multiple cells. When heating a cell, the heating device heats all cells simultaneously; after heating is complete, the heating device stops heating all cells simultaneously.

[0003] However, the distribution of each battery cell varies. Based on these different locations, some cells heat up quickly, while others heat up more slowly, potentially leading to significant temperature differences between cells and thus poor battery temperature uniformity. For example, some cells located near the center of the mounting area tend to have poor heat dissipation and heat up quickly. Conversely, some cells located near the edge of the mounting area tend to dissipate heat more easily and heat up more slowly.

[0004] Therefore, heating all battery cells uniformly will result in a large temperature difference between different battery cells. Utility Model Content

[0005] The purpose of this invention is to solve the following technical problem: uniformly heating all battery cells will result in a large temperature difference between different battery cells, leading to poor temperature consistency of the battery.

[0006] To achieve the above objectives, this utility model provides a battery comprising multiple power supply units arranged side by side. Each power supply unit includes a power-on / off controller and at least one battery cell. A heating film is attached to the outer periphery of the battery cell. Both the positive and negative terminals of the battery cell are connected to the heating film, and at least one of the connections between the positive terminal and the heating film, and between the negative terminal and the heating film, is provided with a power-on / off controller. The power-on / off controller can control the formation of a circuit or a circuit between the heating film and the battery cell based on control signals from the battery management system. When the power-on / off controller controls the formation of a circuit between the heating film and the battery cell, the heating film can be energized and heat the outer periphery of the battery cell. When the power-on / off controller controls the formation of a circuit between the heating film and the battery cell, the heating film can be de-energized and stop heating the outer periphery of the battery cell.

[0007] In some embodiments, the number of power-on / off controllers is one, and the number of battery cells is two or more. The power-on / off controller can control the formation of a circuit or a circuit break between all battery cells and their corresponding heating films.

[0008] In some embodiments, the number of power-on / off controllers is the same as the number of battery cells and corresponds one-to-one. Each power-on / off controller can control the formation of a circuit or a circuit break between the corresponding battery cell and the corresponding heating film.

[0009] In some embodiments, the power supply unit further includes a plurality of temperature sensors, which are distributed at least at the positive terminal of the battery cell, the negative terminal of the battery cell, the middle position of the outer periphery of the battery cell, and the edge position of the outer periphery of the battery cell. The temperature sensors can be connected to the battery management system.

[0010] In some embodiments, the heating film includes a heating material layer and two insulating material layers, the two insulating material layers being stacked and sequentially covering the outer periphery of the battery cell, the heating material layer being located between the two insulating material layers, and the heating material layer including a plurality of heating portions spaced apart along the direction surrounding the battery cell; one of the positive electrode and the negative electrode of the battery cell is connected to the heating material layer, and the other of the positive electrode and the negative electrode of the battery cell is connected to the heating material layer through a power-on / off controller; the power-on / off controller can control the formation of a circuit or a circuit break between the heating material layer and the battery cell based on the control signal of the battery management system.

[0011] In some embodiments, the heating film further includes two conductive elements capable of conducting electricity and heat, the two conductive elements being spaced apart in the direction from the positive electrode of the battery cell to its negative electrode, and the two ends of each heating element being connected to the two conductive elements respectively; the two conductive elements are respectively connected to the positive electrode and the negative electrode of the battery cell; and the positive electrode of the battery cell is connected to the corresponding conductive element, and the negative electrode of the battery cell is connected to the corresponding conductive element through a power-on / off controller.

[0012] In some embodiments, the positive electrode of the battery cell is connected to the heating material layer through a first conductive sheet, the negative electrode of the battery cell is connected to the heating material layer through a second conductive sheet, and the power-on / off controller is disposed on the second conductive sheet.

[0013] In some embodiments, the outer surfaces of the first conductive sheet and the second conductive sheet are respectively covered with an insulating layer; and / or, the first conductive sheet is attached to the end face of the positive electrode of the battery cell; and / or, the second conductive sheet is attached to the end face of the negative electrode of the battery cell.

[0014] In some embodiments, the battery cell is rectangular in shape, having two large faces containing its long side and its height side, and two narrow faces containing its long side and its width side. The area of ​​the large faces is larger than the area of ​​the narrow faces. A heating film is attached to the two large faces and the two narrow faces, and the heating film is capable of heating at least one large face.

[0015] This utility model also provides an electrical device, which includes the battery described in the above embodiment.

[0016] The above technical solution has the following beneficial effects:

[0017] In each power supply unit, the battery cell and the heating film attached to it form a conductive circuit. When the heating film is energized, it heats the battery cell. When the battery management system sends a start control signal to the power-on / off controller, a path is formed between the heating film and the battery cell. The heating film is energized and heats the outer periphery of the battery cell, increasing its temperature and reducing the temperature difference between it and other cells. When the battery management system sends a stop control signal to the power-on / off controller, a break circuit is formed between the heating film and the battery cell. The heating film is de-energized and stops heating the outer periphery of the battery cell, maintaining the temperature of the power supply unit within the target range. Because each battery cell in each power supply unit can be heated by its corresponding heating film, each cell can maintain a consistent temperature with other cells through independent heating, avoiding large temperature differences between cells and ensuring that the temperature of all power supply units remains within the target range, thus maintaining good temperature uniformity throughout the battery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the arrangement of multiple power supply units in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the arrangement of multiple power supply units in one embodiment of the present invention;

[0020] Figure 3 This is a three-dimensional schematic diagram of the battery cell in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the distribution of the heating film in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the distribution of the power on / off controller in one embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram showing the distribution of the first conductive sheet in one embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the distribution of the conductive elements in one embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the connection between the second conductive sheet and the conductive element in one embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Power supply unit;

[0028] 11. Battery cell; 111. Positive electrode; 112. Negative electrode; 113. Large facet; 114. Narrow facet; 115. End face;

[0029] 12. Power on / off controller;

[0030] 13. Heating film; 131. Heating material layer; 1311. First heating layer; 1312. Second heating layer; 132. Insulating material layer; 133. Conductive element; 134. First conductive sheet; 135. Second conductive sheet. Detailed Implementation

[0031] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are intended only to explain this utility model and not to limit it. For those skilled in the art, this utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this utility model by illustrating examples of it.

[0032] like Figures 1 to 6 As shown, this utility model provides a battery comprising multiple power supply units 1 arranged side by side. Each power supply unit 1 includes a power-on / off controller 12 and at least one battery cell 11. A heating film 13 is attached to the outer periphery of the battery cell 11. Both the positive electrode 111 and the negative electrode 112 of the battery cell 11 are connected to the heating film 13. At least one of the connections between the positive electrode 111 and the heating film, and between the negative electrode 112 and the heating film, is provided with a power-on / off controller 12. The power-on / off controller 12 can control the formation of a circuit or a disconnection between the heating film 13 and the battery cell 11 based on control signals from the battery management system. When the power-on / off controller 12 controls the formation of a circuit between the heating film 13 and the battery cell 11, the heating film 13 is energized and heats the outer periphery of the battery cell 11. When the power-on / off controller 12 controls the formation of a disconnection between the heating film 13 and the battery cell 11, the heating film 13 is de-energized and stops heating the outer periphery of the battery cell 11.

[0033] To clarify, the "battery management system" mentioned here can refer to the existing battery pack's BMS system, which will not be elaborated upon further here.

[0034] Specifically, in each power supply unit 1, the battery cell 11 and the heating film 13 attached to the battery cell 11 can form a conductive circuit. When the heating film 13 is energized, it heats the battery cell 11. When the battery management system sends a start control signal to the power-on / off controller 12, a path is formed between the heating film 13 and the battery cell 11. The heating film 13 is energized and heats the outer periphery of the battery cell 11, increasing the temperature of the battery cell 11 and reducing the temperature difference between the battery cell 11 and other battery cells 11. When the battery management system sends a stop control signal to the power-on / off controller 12, an open circuit is formed between the heating film 13 and the battery cell 11. The heating film 13 is de-energized and stops heating the outer periphery of the battery cell 11, ensuring that the temperature of the power supply unit 1 is maintained within the target range. Since each cell 11 in each power supply unit 1 can be heated by its corresponding heating film 13, each cell 11 can maintain the same temperature as other cells 11 by heating independently, avoiding large temperature differences between different cells 11, and keeping the temperature of all power supply units 1 within the target range, thus ensuring good temperature consistency of the entire battery.

[0035] In addition, the battery can also achieve active voltage balancing. When the battery management system detects that the voltage of a certain cell 11 is too high, the battery management system can control the power on / off controller 12 to turn on, and the heating film 13 can consume the power of the cell 11 in an appropriate amount, thereby reducing the voltage of the cell 11 and eliminating the voltage difference between the cell 11 and other cells 11.

[0036] In some embodiments, the battery cell 11 can be a cylindrical battery cell, a pouch battery cell, or a prismatic battery cell. Therefore, the shape of the battery cell 11 can be cylindrical, cuboid, or cubic, etc., and this utility model does not impose any limitations.

[0037] In some embodiments, the power on / off controller 12 may be a relay or a load switch, etc., and the present invention does not impose any limitations.

[0038] In some embodiments, the heating film 13 covers the outer periphery of the battery cell 11, and the heating film 13 provides insulation protection for the outer periphery of the battery cell 11.

[0039] In some embodiments, the battery further includes a housing in which all power supply units 1 are arranged side by side.

[0040] In some embodiments of this utility model, the number of power-on / off controllers 12 is one, and the number of battery cells 11 is two or more. The power-on / off controller 12 can control the formation of a circuit or a circuit break between all battery cells 11 and the corresponding heating film 13.

[0041] Specifically, in power supply unit 1, multiple battery cells 11 share a single power on / off controller 12, which can reduce battery manufacturing costs. Preferably, the number of battery cells 11 can be 2-4.

[0042] like Figures 1 to 2 As shown, in some embodiments of this utility model, the number of power-on / off controllers 12 is the same as the number of battery cells 11 and they correspond one-to-one. Each power-on / off controller 12 can control the formation of a circuit or a circuit break between the corresponding battery cell 11 and the corresponding heating film 13.

[0043] Specifically, each cell 11 is equipped with a power-on / off controller 12, so each cell 11 in the power supply unit 1 can achieve precise and independent heating, ensuring that all cells 11 in the power supply unit 1 maintain a consistent temperature, thereby improving the temperature uniformity of the entire battery. Preferably, the number of cells 11 can be 1-4.

[0044] In some embodiments of this utility model, the power supply unit 1 further includes a plurality of temperature sensors, which are distributed at least at the positive electrode 111 of the battery cell 11, the negative electrode 112 of the battery cell 11, the middle position of the outer periphery of the battery cell 11, and the edge position of the outer periphery of the battery cell 11. The temperature sensors can be connected to the battery management system.

[0045] Specifically, these temperature sensors can detect the temperature at multiple locations within the battery cell 11, and transmit this temperature information to the battery management system, enabling the system to obtain precise temperature information for each cell 11. If the temperature of a particular cell 11 is significantly lower than that of other cells 11, or if the temperature of a particular power supply unit 1 is significantly lower than that of other power supply units 1, the battery management system can activate the corresponding on / off controller 12 to heat the corresponding cell 11. Once the cell 11 has reached a preset temperature, the battery management system can shut down the corresponding on / off controller 12 to prevent the cell 11 from overheating.

[0046] In some embodiments, the temperature sensor is connected to the battery management system via a signal connection or an electrical connection.

[0047] like Figure 7As shown, in some embodiments of this utility model, the heating film 13 includes a heating material layer 131 and two insulating material layers 132. The two insulating material layers 132 are stacked and sequentially cover the outer periphery of the battery cell 11. The heating material layer 131 is located between the two insulating material layers 132 and includes a plurality of heating portions spaced apart along the direction surrounding the battery cell 11. One of the positive electrode 111 and the negative electrode 112 of the battery cell 11 is connected to the heating material layer 131, and the other of the positive electrode 111 and the negative electrode 112 of the battery cell 11 is connected to the heating material layer 131 through a power-on / off controller 12. The power-on / off controller 12 can control the formation of a circuit or a circuit between the heating material layer 131 and the battery cell 11 based on the control signal of the battery management system.

[0048] Specifically, the insulating material layer 132 isolates the heating material layer 131 from the outer periphery of the battery cell 11, preventing direct contact between them. The battery cell 11 and the heating material layer 131 form a conductive circuit, allowing the heating material layer 131 to heat the battery cell 11 when energized. When the battery management system sends a start control signal to the power-on / off controller 12, a circuit is formed between the heating material layer 131 and the battery cell 11, energizing the heating material layer 131 and heating the outer periphery of the battery cell 11, increasing its temperature and reducing the temperature difference between it and other battery cells 11. When the battery management system sends a stop control signal to the power-on / off controller 12, an open circuit is formed between the heating material layer 131 and the battery cell 11, de-energizing the heating material layer 131 and ceasing heating the outer periphery of the battery cell 11, thus maintaining the temperature of the power supply unit 1 within the target range. In addition, the heating material layer 131 includes a plurality of heating parts spaced apart along the direction surrounding the battery cell 11. The heating material layer 131 can heat multiple locations on the outer periphery of the battery cell 11. Therefore, the heating area of ​​the heating material layer 131 is large and the heating power is high, which improves the heating rate of the battery cell 11 and the entire battery cell 11 can be heated in a shorter time.

[0049] In some embodiments, the insulating material layer 132 may be made of polyimide or polyethylene terephthalate. In some embodiments, the heating material layer 131 may be made of metal oxide semiconductor (MOSH), graphene, or silicon carbide. The thickness of the MOSH may be controlled to be 0.2 mm or more; more specifically, 0.26 mm or more.

[0050] In some embodiments, the heating film 13 may be a MOSH heating film commonly used in the art, such as a self-heating integrated plate with announcement number CN210508148U or a high light transmittance heating structure with announcement number CN219678709U.

[0051] In some embodiments, both ends of the battery cell 11 are also covered by a heating film 13, and the heating material layer 131 can heat both ends of the battery cell 11 to further accelerate the heating rate of the battery cell 11.

[0052] like Figures 7 to 8 As shown, in some embodiments of this utility model, the heating film 13 further includes two conductive and thermally conductive elements 133. The two conductive elements 133 are spaced apart in the direction from the positive electrode 111 of the battery cell 11 to its negative electrode 112, and both ends of each heating element are connected to the two conductive elements 133 respectively. The two conductive elements 133 correspond to the positive electrode 111 and the negative electrode 112 of the battery cell 11 respectively; and the positive electrode 111 of the battery cell 11 is connected to the corresponding conductive element 133, and the negative electrode 112 of the battery cell 11 is connected to the corresponding conductive element 133 through the on / off controller 12.

[0053] Specifically, by providing conductive elements 133, the positive electrode 111 of the battery cell 11 is easily connected to all heating elements, so that all heating elements can generate heat. Moreover, since the two conductive elements 133 are spaced apart in the direction from the positive electrode 111 of the battery cell 11 to its negative electrode 112, the entire heating element can be used as part of a conductive circuit, allowing the entire heating element to be heated.

[0054] In some embodiments, such as Figure 8 As shown, the conductive element 133 is a U-shaped conductive component made of copper foil, and the conductive element 133 is located between two insulating material layers 132.

[0055] like Figures 3 to 6 As shown, in some embodiments of this utility model, the positive electrode 111 of the battery cell 11 is connected to the heating material layer 131 through the first conductive sheet 134, the negative electrode 112 of the battery cell 11 is connected to the heating material layer 131 through the second conductive sheet 135, and the power on / off controller 12 is disposed on the second conductive sheet 135.

[0056] Specifically, on one hand, the first conductive sheet 134 and the second conductive sheet 135 are conductive, enabling the heating material layer 131 to be heated by electricity. On the other hand, the heat from the heating material layer 131 can be conducted through the first conductive sheet 134 to the positive electrode 111 of the battery cell 11, and the heat from the heating material layer 131 can also be conducted through the second conductive sheet 135 to the negative electrode 112 of the battery cell 11. Then, the heat is conducted to the interior of the battery cell 11 through the positive electrode 111 and the negative electrode 112. Therefore, while the outer periphery of the battery cell 11 is heated, heat is also conducted to the interior of the battery cell 11 through the positive electrode 111 and the negative electrode 112, realizing the design of simultaneous heat conduction through two heat conduction paths: the outer periphery and the tabs (i.e., the positive electrode 111 and the negative electrode 112), greatly improving the heating efficiency of the battery cell 11.

[0057] In some embodiments, the first conductive sheet 134 and the second conductive sheet 135 are sheet-like components made of copper foil. In some embodiments, the first conductive sheet 134 and the corresponding conductive element 133 are integrally formed. In some embodiments, the conductive element 133 and the first conductive sheet 134 directly connected thereto are integrally formed.

[0058] In some embodiments, the thickness of the first conductive sheet 134 and the second conductive sheet 135 ranges from 10 μm to 500 μm, and the width of the first conductive sheet 134 and the second conductive sheet 135 ranges from 0.5 mm to 100 mm. To improve thermal conductivity, a thicker or wider first conductive sheet 134 and second conductive sheet 135 can be used.

[0059] In some embodiments of this utility model, the outer surface of the first conductive sheet 134 and the outer surface of the second conductive sheet 135 are respectively covered with an insulating layer to form an insulating protection.

[0060] like Figures 3 to 6 As shown, in some embodiments of the present invention, the first conductive sheet 134 is attached to the end face 115 where the positive electrode 111 of the battery cell 11 is located. In some embodiments of the present invention, the second conductive sheet 135 is attached to the end face 115 where the negative electrode 112 of the battery cell 11 is located.

[0061] Specifically, the battery cell 11 has two end faces 115 spaced apart along its length L, with the positive electrode 111 and the negative electrode 112 of the battery cell 11 located at the two end faces 115 respectively. A first conductive sheet 134 is attached to the end face 115 where the positive electrode 111 is located, and a portion of the first conductive sheet 134 is located within the heating film 13. A second conductive sheet 135, connected to the negative electrode 112 of the battery cell 11, is attached to the end face 115 where the negative electrode 112 is located. A second conductive sheet 135, connected to the conductive member 133, is attached to the end face 115 where the negative electrode 112 is located, and a portion of the second conductive sheet 135 is located within the heating film 13. By attaching the first conductive sheet 134 and the second conductive sheet 135 together, contact with other components can be avoided.

[0062] like Figures 3 to 6 As shown, in some embodiments of this utility model, the battery cell 11 is rectangular in shape, and the battery cell 11 has two large surfaces 113 where its long side and its height side are located, and two narrow surfaces 114 where its long side and its width side are located. The area of ​​the large surfaces is larger than the area of ​​the narrow surfaces. The heating film 13 is attached to the two large surfaces 113 and the two narrow surfaces 114, and the heating film 13 can heat at least one large surface 113.

[0063] Specifically, the battery cell 11 can be a short-blade battery cell or a long-blade battery cell, etc. The outer periphery of the battery cell 11 includes a top, a bottom, and two sides. Two narrow surfaces 114 are located at the top and bottom of the outer periphery, respectively, that is, the two narrow surfaces 114 are spaced apart in the height direction H of the battery cell 11. Two large surfaces 113 are located at the two sides, that is, the two large surfaces 113 are spaced apart in the width direction W of the battery cell 11. Among them, the large surface 113 of the battery cell 11 is the surface containing the long side and the high side, and the narrow surface 114 of the short-blade battery cell is the surface containing the long side and the wide side, so the area of ​​the large surface 113 is much larger than the area of ​​the narrow surface 114. The heating film 13 covers the two large surfaces 113 and the two narrow surfaces 114. The heating part of the heating film 13 (e.g., the heating material layer 131 or the heating part of the heating material layer 131) is provided at least corresponding to one of the large surfaces 113 and is capable of heating it.

[0064] In some embodiments, such as Figure 7 As shown, the heating material layer 131 includes three heating elements: two first heating layers 1311 and one second heating layer 1312. The two first heating layers 1311 correspond one-to-one with the two large surfaces 113, and the area of ​​the first heating layer 1311 is adapted to the area of ​​the large surface 113 to ensure sufficient heating of the large surface 113. The second heating layer 1312 corresponds to the top narrow surface 114, and the area of ​​the second heating layer 1312 is adapted to the area of ​​the narrow surface 114 to ensure sufficient heating of the narrow surface 114. In this embodiment, a design is achieved where two heat conduction paths—the outer periphery and the tabs (i.e., the positive electrode 111 and the negative electrode 112)—conduct heat simultaneously, which can greatly improve the heating rate of the battery cell 11.

[0065] This utility model also provides an electrical device, which includes the battery described in the above embodiments. This electrical device may specifically be a new energy vehicle, an energy storage device, or an electric motorcycle, etc., and is not limited thereto.

[0066] Specifically, the electrical device uses the battery described in the above embodiment, thus achieving the aforementioned technical effects.

[0067] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above are only preferred embodiments of this utility model. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A battery, characterized in that, It includes multiple power supply units (1) arranged side by side, each power supply unit (1) including a power on / off controller (12) and at least one battery cell (11), the outer periphery of which is attached with a heating film (13). The positive electrode (111) and negative electrode (112) of the battery cell (11) are both connected to the heating film (13), and at least one of the positive electrode (111) and the heating film (13) and the negative electrode (112) and the heating film (13) is provided with the on / off controller (12). The on / off controller (12) can control the formation of a circuit or a circuit between the heating film (13) and the battery cell (11) based on the control signal of the battery management system. When the power-on / off controller (12) controls the formation of a circuit between the heating film (13) and the battery cell (11), the heating film (13) can be energized and heat the outer periphery of the battery cell (11); when the power-on / off controller (12) controls the formation of a circuit between the heating film (13) and the battery cell (11), the heating film (13) can be de-energized and stop heating the outer periphery of the battery cell (11).

2. The battery according to claim 1, characterized in that, The number of power on / off controllers (12) is one, and the number of battery cells (11) is two or more. The power on / off controller (12) can control the formation of a circuit or a circuit between all the battery cells (11) and the corresponding heating film (13).

3. The battery according to claim 1, characterized in that, The number of power on / off controllers (12) is the same as the number of battery cells (11) and they correspond one-to-one. Each power on / off controller (12) can control the formation of a circuit or a circuit between the corresponding battery cell (11) and the corresponding heating film (13).

4. The battery according to claim 1, characterized in that, The power supply unit (1) also includes multiple temperature sensors, which are distributed at least at the positive electrode (111) of the battery cell (11), at the negative electrode (112) of the battery cell (11), at the middle position of the outer periphery of the battery cell (11), and at the edge position of the outer periphery of the battery cell (11). The temperature sensors can be connected to the battery management system.

5. The battery according to claim 1, characterized in that, The heating film (13) includes a heating material layer (131) and two insulating material layers (132). The two insulating material layers (132) are stacked and sequentially cover the outer periphery of the battery cell (11). The heating material layer (131) is located between the two insulating material layers (132). The heating material layer (131) includes a plurality of heating portions spaced apart along the direction surrounding the battery cell (11). One of the positive electrode (111) and the negative electrode (112) of the battery cell (11) is connected to the heating material layer (131), and the other of the positive electrode (111) and the negative electrode (112) of the battery cell (11) is connected to the heating material layer (131) through the power-on / off controller (12); the power-on / off controller (12) can control the formation of a circuit or a circuit between the heating material layer (131) and the battery cell (11) based on the control signal of the battery management system.

6. The battery according to claim 5, characterized in that, The heating film (13) also includes two conductive elements (133) capable of conducting electricity and heat. The two conductive elements (133) are spaced apart in the direction from the positive electrode (111) of the battery cell (11) to its negative electrode (112). The two ends of each heating part are respectively connected to the two conductive elements (133). The two conductive elements (133) correspond to the positive terminal (111) and the negative terminal (112) of the battery cell (11), respectively; and the positive terminal (111) of the battery cell (11) is connected to the corresponding conductive element (133), and the negative terminal (112) of the battery cell (11) is connected to the corresponding conductive element (133) through the power on / off controller (12).

7. The battery according to claim 5, characterized in that, The positive electrode (111) of the battery cell (11) is connected to the heating material layer (131) through the first conductive sheet (134), and the negative electrode (112) of the battery cell (11) is connected to the heating material layer (131) through the second conductive sheet (135). The power on / off controller (12) is disposed on the second conductive sheet (135).

8. The battery according to claim 7, characterized in that, The outer surfaces of the first conductive sheet (134) and the second conductive sheet (135) are respectively covered with an insulating layer; And / or, the first conductive sheet (134) is attached to the end face (115) where the positive electrode (111) of the battery cell (11) is located. And / or, the second conductive sheet (135) is attached to the end face (115) where the negative electrode (112) of the cell (11) is located.

9. The battery according to claim 1, characterized in that, The battery cell (11) is rectangular in shape. The battery cell (11) has two large surfaces (113) with its long side and its height side, and two narrow surfaces (114) with its long side and its width side. The area of ​​the large surface (113) is larger than the area of ​​the narrow surface (114). The heating film (13) is attached to the two large surfaces (113) and the two narrow surfaces (114), and the heating film (13) can heat at least one of the large surfaces (113).

10. An electrical appliance, characterized in that, The battery includes any one of claims 1-9.

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