Battery cell assembly, battery, and electric device

Abstract

The utility model relates to the technical field of electric core heating, specifically relates to an electric core assembly, a battery and an electric device. The electric core assembly comprises an electric core and a heating film, the heating film is wrapped around the outer circumferential part of the electric core, the heating film has a heating material layer inside, and a positive electrode connecting piece and a negative electrode connecting piece are led out from the heating material layer, the positive electrode connecting piece is used for conductive connection with the positive electrode of a power supply, and the negative electrode connecting piece is used for conductive connection with the negative electrode of the power supply; wherein when the positive electrode connecting piece and the negative electrode connecting piece are electrified simultaneously, the heating material layer can heat the electric core wrapped by the heating film. Since the heating film is wrapped around the outer circumferential part of the electric core, the heating material layer can quickly heat the outer circumferential part of the electric core after being electrified and heated, the entire electric core can complete temperature rise in a shorter time, the temperature rise rate of the electric core is improved, and the instantaneous performance of the battery is improved.

Description

Technical Field

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

[0002] In low-temperature environments, the battery cell's low-temperature performance is poor. To raise the cell's temperature, a heating plate is typically used. However, the heating effect of the heating plate is poor, resulting in a low temperature rise rate for the cell and a decrease in the battery's instantaneous performance. Utility Model Content

[0003] The purpose of this invention is to solve or at least partially solve the above-mentioned defects, thereby providing a cell assembly, battery, and electrical device.

[0004] To achieve the above objectives, this utility model provides a battery cell assembly, which includes a battery cell and a heating film. The heating film covers the outer periphery of the battery cell, and the interior of the heating film has a heating material layer. A positive electrode connector and a negative electrode connector are led out from the heating material layer. The positive electrode connector is used for conductive connection with the positive electrode of the power supply, and the negative electrode connector is used for conductive connection with the negative electrode of the power supply. When the positive electrode connector and the negative electrode connector are energized simultaneously, the heating material layer can heat the battery cell covered by the heating film.

[0005] In some embodiments, the power source is a battery cell corresponding to the positive and negative terminals, the positive terminal is configured to be conductively connected to the positive terminal of the corresponding battery cell, and the negative terminal is configured to be conductively connected to the negative terminal of the corresponding battery cell; or, the power source is an external power source, the positive terminal is configured to be conductively connected to the positive terminal of the external power source, and the negative terminal is configured to be conductively connected to the negative terminal of the external power source.

[0006] In some embodiments, a heating zone is provided on the outer periphery of the battery cell, and a heating material layer is correspondingly disposed on the heating zone.

[0007] In some embodiments, there are at least two heating zones, each of which is provided with a heating material layer; and / or, the heating material layer includes a first part and a second part, the first part being a portion of the heating material layer away from the center of the battery cell, the second part being a portion of the heating material layer close to the center of the battery cell, the thickness of the heating material in the second part being less than the thickness of the heating material in the first part, or the content of the heating material in the second part being less than the content of the heating material in the first part.

[0008] In some embodiments, a conductive connector is also provided, wherein the positive electrode connector is electrically connected to the heating material layer through the conductive connector, and the negative electrode connector is electrically connected to the heating material layer through the conductive connector.

[0009] In some embodiments, a heat-conducting element is further provided, wherein at least a portion of the heat-conducting element is connected to a conductive connector, and at least a portion of the heat-conducting element is insulated and thermally conductively contacted with the end face of the positive or negative electrode of the battery cell, or is connected to the positive or negative electrode of the battery cell; or, at least a portion of the heat-conducting element is connected to a heating material layer, and at least a portion of the heat-conducting element is insulated and thermally conductively contacted with the end face of the positive or negative electrode of the battery cell; or, at least a portion of the heat-conducting element is connected to a positive electrode connector, and at least a portion of the heat-conducting element is connected to the end face of the positive electrode of the battery cell, and / or, at least a portion of the heat-conducting element is connected to a negative electrode connector, and at least a portion of the heat-conducting element is connected to the end face of the negative electrode of the battery cell.

[0010] In some embodiments, the battery cell is rectangular in shape and includes two large surface portions spaced apart along its width direction and a narrow surface portion located at its top. The heating material layer is capable of heating at least one large surface portion and one narrow surface portion.

[0011] In some embodiments, the heating material layer includes two first heating layers and one second heating layer. The two first heating layers are capable of heating two large surface portions respectively, and the second heating layer is capable of heating a narrow surface portion. The second heating layer is located between the two first heating layers and is spaced apart from each other; and / or, the heating film includes four bent portions for covering the edges of the battery cell, wherein no heating material layer is disposed in the bent portions.

[0012] The present invention also provides a battery, which includes a housing and a plurality of cell assemblies as described above, wherein the plurality of cell assemblies are installed in the housing.

[0013] This utility model provides an electrical device, which includes the battery described in the above embodiment.

[0014] The above-mentioned technical solution of this utility model has the following beneficial effects:

[0015] The power source, positive terminal connector, heating material layer, and negative terminal connector form a conductive circuit. When both the positive and negative terminal connectors are energized simultaneously, the heating material layer heats up. Because the heating film covers the outer periphery of the battery cell, the heating material layer can quickly heat the outer periphery of the battery cell after being energized, allowing the entire battery cell to heat up in a shorter time. This increases the heating rate of the battery cell and thus improves the instantaneous performance of the battery. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the battery cell in one embodiment of the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of a battery cell assembly in one embodiment of the present invention;

[0018] Figure 3 This is a three-dimensional schematic diagram of a battery cell assembly in one embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the distribution of the heat-conducting foil in one embodiment of the present invention;

[0020] Figure 5 This is a cross-sectional schematic diagram of a battery cell assembly in one embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the negative electrode connector and the heat-conducting foil connected to the conductive connector in one embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Battery cell; 11. Large surface area; 12. Narrow surface area; 13. Positive electrode tab; 14. Negative electrode tab; 15. End face; 16. Edge;

[0024] 2. Heating film; 21. Heating material layer; 211. First heating layer; 212. Second heating layer; 22. Insulating material layer; 23. Positive electrode connector; 24. Negative electrode connector; 25. Bending part; 26. Conductive connector; 27. Heat-conducting component. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 4 As shown, this utility model provides a battery cell assembly, which includes a battery cell 1 and a heating film 2. The heating film 2 covers the outer periphery of the battery cell 1, and the interior of the heating film 2 has a heating material layer 21. A positive electrode connector 23 and a negative electrode connector 24 are led out from the heating material layer 21. The positive electrode connector 23 is used to conduct electricity to the positive electrode of the power supply, and the negative electrode connector 24 is used to conduct electricity to the negative electrode of the power supply. When the positive electrode connector 23 and the negative electrode connector 24 are energized at the same time, the heating material layer 21 can heat the battery cell 1 covered by the heating film 2.

[0027] Specifically, the power supply, positive electrode connector 23, heating material layer 21, and negative electrode connector 24 can form a conductive circuit, and when the positive electrode connector 23 and the negative electrode connector 24 are energized simultaneously, the heating material layer 21 can generate heat. Since the heating film 2 covers the outer periphery of the cell 1, the heating material layer 21 can quickly heat the outer periphery of the cell 1 after being energized, and the entire cell 1 can complete the temperature rise in a shorter time. The heating rate of the cell 1 is increased, thereby improving the instantaneous performance of the battery.

[0028] In some embodiments, the heating film 2 includes a heating material layer 21 and two insulating material layers 22, with the heating material layer 21 located between the two insulating material layers 22, i.e., the heating material layer 21 is located in the middle of the heating film 2 along its thickness direction. The insulating material layers 22 of the heating film 2 can form an insulating protection for the outer periphery of the battery cell 1. Furthermore, the insulating material layers 22 isolate the heating material layer 21 from the outer periphery of the battery cell 1, preventing direct contact between the heating material layer 21 and the outer periphery of the battery cell 1. Preferably, the insulating material layer 22 can be made of polyimide or polyethylene terephthalate.

[0029] In some embodiments, the heating material layer 21 employs metal oxide semiconductor heating material (MOSH), graphene material, or silicon carbide material, etc. The thickness of the MOSH can be controlled to be 0.2 mm or more; furthermore, 0.26 mm or more.

[0030] In some embodiments, the heating film 2 can 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.

[0031] In some embodiments, the battery cell 1 can be a cylindrical battery cell, a pouch battery cell, or a prismatic battery cell. Therefore, the shape of the battery cell 1 can be cylindrical, cuboid, or cubic, etc., and this utility model does not impose any limitations.

[0032] In some embodiments of this invention, the heating film 2 is bonded to the outer periphery of the battery cell 1 to ensure a firm connection between them. Specifically, the bonding between the heating film 2 and the outer periphery of the battery cell 1 can be achieved using thermally conductive adhesive. Furthermore, the heating film 2 also possesses insulating properties and can provide insulation protection for the outer periphery of the battery cell 1.

[0033] In some embodiments of this utility model, the power source is a battery cell 1 corresponding to the positive terminal connector 23 and the negative terminal connector 24. The positive terminal connector 23 is configured to be conductively connected to the positive terminal of the corresponding battery cell 1, and the negative terminal connector 24 is configured to be conductively connected to the negative terminal of the corresponding battery cell 1.

[0034] Specifically, the power source of the heating material layer 21 is the corresponding battery cell 1. At this time, the battery cell 1 achieves self-heating without relying on an external power source, which helps to simplify the electrical equipment.

[0035] In some embodiments, the positive electrode connector 23 can be electrically connected to the positive electrode of the battery cell 1 via a relay to control the start and stop of the self-heating process. In other embodiments, the negative electrode connector 24 can be electrically connected to the negative electrode of the battery cell 1 via a relay to control the start and stop of the self-heating process.

[0036] like Figures 1 to 4 As shown, in some embodiments of this utility model, the power supply is an external power supply, the positive terminal connector 23 is configured to be conductively connected to the positive terminal of the external power supply, and the negative terminal connector 24 is configured to be conductively connected to the negative terminal of the external power supply.

[0037] Specifically, the external power source can be a separate power source independent of the battery cell assembly, or it can be a total battery pack formed by connecting multiple battery cell assemblies in series and parallel. This utility model does not impose any limitations. Furthermore, when the external power source is the battery pack, the positive terminal connector 23 and the negative terminal connector 24 are respectively connected to the total positive output and the total negative output of the battery pack.

[0038] like Figure 5 As shown, in some embodiments of this utility model, a heating zone is provided on the outer periphery of the battery cell 1, and a heating material layer 21 is correspondingly disposed on the heating zone.

[0039] Specifically, the heating material layer 21 heats the area to be heated, allowing the battery cell 1 to heat up rapidly in a short time. The area to be heated can be located on the outer periphery where heat conduction is convenient, so that the battery cell 1 can heat up quickly.

[0040] like Figure 5 As shown, in some embodiments of this utility model, there are at least two heating zones, and each heating zone is provided with a heating material layer 21.

[0041] Specifically, by setting at least two heating zones, and each heating zone having a corresponding heating material layer 21, the heating area and heating power are greatly increased, so that the battery cell 1 can heat up quickly.

[0042] In some embodiments, the outer periphery of the battery cell 1 includes four parts: a bottom, a top, and two sides. At least two parts of the outer periphery are provided with heating zones, so that the heating material layer 21 can heat at least two parts of the outer periphery of the battery cell 1. For example, the top and one of the sides are each provided with a heating zone, and the heating material layer 21 can heat the top and one side. Alternatively, the top and two sides are each provided with a heating zone, and the heating material layer 21 can heat the top and both sides. Another example is that the top and bottom are each provided with a heating zone, and the heating material layer 21 can heat both the top and bottom.

[0043] In some embodiments, heating zones are also provided at both ends of the battery cell 1. The two ends of the battery cell 1 are covered by the heating film 2, and the heating material layer 21 can heat the two ends of the battery cell 1 to further accelerate the heating rate of the battery cell 1.

[0044] In some embodiments of this utility model, the heating material layer 21 includes a first part and a second part. The first part is the portion of the heating material layer 21 that is far from the middle of the battery cell 1, and the second part is the portion of the heating material layer 21 that is close to the middle of the battery cell 1. The thickness of the heating material in the second part is less than the thickness of the heating material in the first part, or the content of the heating material in the second part is less than the content of the heating material in the first part.

[0045] Specifically, the middle part of cell 1 refers to the relatively central area on the outer periphery of cell 1. Compared to other parts of cell 1, the middle part of cell 1 is more prone to heat accumulation and heats up faster. The thickness of the heating material in the second part is less than that in the first part, or the content of the heating material in the second part is less than that in the first part. This allows for a suitable reduction in the heating power to the middle part of cell 1 and a suitable increase in the heating power to other parts of cell 1, thereby ensuring a consistent overall heating rate in the heated area and thus maintaining a consistent temperature across the entire cell 1.

[0046] like Figure 5 As shown, in some embodiments of this utility model, a conductive connector 26 is also provided. The positive electrode connector 23 is electrically connected to the heating material layer 21 through the conductive connector 26, and the negative electrode connector 24 is electrically connected to the heating material layer 21 through the conductive connector 26.

[0047] Specifically, the conductive connector 26 can be disposed in the middle of the heating film 2 in its thickness direction. By providing two conductive connectors 26, it is convenient for the positive electrode connector 23 and the negative electrode connector 24 to be electrically connected to the entire heating material layer 21. Preferably, the two conductive connectors 26 are spaced apart in the length direction L of the cell 1.

[0048] In some embodiments, such as Figure 6As shown, the conductive connector 26 can be a U-shaped conductive component made of copper foil, and the conductive connector 26 is located between two insulating material layers 22.

[0049] In some implementations, the positive electrode connector 23 and the negative electrode connector 24 are sheet-shaped conductive components made of copper foil. The positive electrode connector 23 and the corresponding conductive connector 26 are integrally formed, as are the negative electrode connector 24.

[0050] The battery cell 1 has two end faces 15 spaced apart along its length L, with the positive and negative electrodes of the battery cell 1 located at the two end faces 15 respectively. To further improve the heating rate of the battery cell 1, heating can also be performed from the end faces 15. The present invention provides three embodiments for heating from the end faces 15 as follows.

[0051] For example, in some embodiments of this utility model, such as Figures 3 to 4 As shown, a heat-conducting component 27 is also provided. At least a portion of the heat-conducting component 27 is connected to the conductive connector 26, and at least a portion of the heat-conducting component 27 is insulated and thermally conductively contacted with the end face 15 where the positive or negative electrode of the battery cell 1 is located, or is connected to the positive or negative electrode of the battery cell 1.

[0052] Specifically, the two ends of the heating film 2 are connected to the positive and negative terminals of the power supply via conductive connectors 26, respectively, so that the heating material layer 21 can be heated by electricity. Simultaneously, the end face 15 of the positive or negative terminal of the battery cell 1 can be connected to the corresponding conductive connector 26 via a heat-conducting component 27, allowing heat to be conducted to the interior of the battery cell 1 through the end face 15. When the heat-conducting component 27 is connected to the positive or negative terminal of the battery cell 1, heat can be further conducted to the interior of the battery cell 1 through the positive or negative terminal. Therefore, while the outer periphery of the battery cell 1 is heated, heat can also be conducted to the interior of the battery cell 1 through the end face 15, achieving a design where both the outer periphery and the end face 15 conduct heat simultaneously.

[0053] Furthermore, when the heating material layer 21 is connected to the positive or negative electrode of the battery cell 1, heat can be further conducted to the interior of the battery cell 1 through the positive or negative electrode, while the normal charging and discharging of the battery cell 1 remains unaffected. Preferably, a portion of the heat-conducting element 27 is connected to the positive electrode tab 13 or the negative electrode tab 14 of the battery cell 1.

[0054] For example, in some embodiments of this utility model, a heat-conducting element 27 is also provided. At least a portion of the heat-conducting element 27 is connected to the heating material layer 21, and at least a portion of the heat-conducting element 27 is insulated and thermally conductively contacted with the end face 15 where the positive or negative electrode of the battery cell 1 is located.

[0055] Similarly, while the outer periphery of the cell 1 is heated, the heat can also be conducted to the inside of the cell 1 through the end face 15, realizing the design of simultaneous heat conduction through the two heat conduction paths of the outer periphery and the end face 15.

[0056] For example, in some embodiments of this utility model, a heat-conducting element 27 is also provided, wherein at least a portion of the heat-conducting element 27 is connected to the positive electrode connector 23, and at least a portion of the heat-conducting element 27 is also connected to the positive electrode end face 15 of the battery cell 1; and / or, at least a portion of the heat-conducting element 27 is connected to the negative electrode connector 24, and at least a portion of the heat-conducting element 27 is also connected to the negative electrode end face 15 of the battery cell 1.

[0057] Specifically, the number of heat-conducting elements 27 can be one or two. The positive electrode of the battery cell 1 can be connected to the positive electrode connector 23 through a heat-conducting element 27, and heat can be conducted through the heat-conducting element 27 to the end face 15 where the positive electrode of the battery cell 1 is located, and then to the interior of the battery cell 1. The negative electrode of the battery cell 1 can be connected to the negative electrode connector 24 through a heat-conducting element 27, and heat can be conducted through the heat-conducting element 27 to the end face 15 where the negative electrode of the battery cell 1 is located, and then to the interior of the battery cell 1. Therefore, while the outer periphery of the battery cell 1 is heated, heat can also be conducted to the interior of the battery cell 1 through the end face 15 of the battery cell 1, realizing the design of simultaneous heat conduction through two heat conduction paths: the outer periphery and the end face 15.

[0058] In some embodiments, such as Figure 6 As shown, the heat-conducting element 27 can be a sheet-like heat-conducting foil made of copper foil, and the heat-conducting foil and the corresponding conductive connector 26 are integrally formed. Of course, the heat-conducting element 27 can also be a ring-shaped heat-conducting component, etc. In some embodiments, the thickness of the heat-conducting element 27 ranges from 10μm to 500μm, and the width of the heat-conducting element 27 is 0.5mm to 100mm. To improve heat conduction efficiency, a thicker or wider heat-conducting element 27 can be used. In some embodiments, a portion of the heat-conducting element 27 is attached to the end face 15 to avoid contact between the heat-conducting element 27 and other components. In some embodiments, a portion of the heat-conducting element 27 is disposed within the heating film 2. In some embodiments, an insulating layer is provided on the outer surface of the heat-conducting element 27.

[0059] like Figures 1 to 5 As shown, in some embodiments of this utility model, the battery cell 1 is rectangular in shape. The battery cell 1 includes two large surface portions 11 that are spaced apart along its width direction W and a narrow surface portion 12 located on its top. The heating material layer 21 is capable of heating at least one large surface portion 11 and one narrow surface portion 12.

[0060] Specifically, the cuboid-shaped battery cell 1 can be a short-blade battery cell or a long-blade battery cell, etc. The outer periphery of the cuboid-shaped battery cell 1 includes a top, a bottom, and two sides. The narrow facet 12 is located at the top of the outer periphery, and the two large facets 11 are located at the two sides respectively. The large facet 11 of the battery cell 1 contains the long side and the high side, while the narrow facet 12 contains the long side and the wide side. Therefore, the area of ​​the large facet 11 is much larger than the area of ​​the narrow facet 12. The heating material layer 21 can heat at least one large facet 11 and one narrow facet 12, so the heating area of ​​the heating material layer 21 is large and the heating power is high, improving the heating rate of the battery cell 1, allowing the entire battery cell 1 to heat up in a shorter time.

[0061] In some embodiments, the battery cell 1 further includes a narrow face portion 12 located at the bottom of the outer periphery, and the two narrow face portions 12 are spaced apart in the height direction H of the battery cell 1. The heating material layer 21 can also heat the narrow face portion 12 at the bottom of the outer periphery.

[0062] like Figure 5 As shown, in some embodiments of the present invention, the heating material layer 21 includes two first heating layers 211 and one second heating layer 212. The two first heating layers 211 can heat the two large surface portions 11 respectively, and the second heating layer 212 can heat the narrow surface portion 12. The second heating layer 212 is located between the two first heating layers 211 and is spaced apart from each other.

[0063] Specifically, the two first heating layers 211 correspond one-to-one with the two large surface portions 11, and the area of ​​the first heating layer 211 is adapted to the area of ​​the large surface portion 11 so as to fully heat the large surface portion 11. The second heating layer 212 corresponds to the narrow surface portion 12, and the area of ​​the second heating layer 212 is adapted to the area of ​​the narrow surface portion 12 so as to fully heat the narrow surface portion 12. The heating material layer 21 can heat the two large surface portions 11 and the narrow surface portion 12, so the heating area of ​​the heating material layer 21 is large and the heating power is high, which further improves the heating rate of the battery cell 1, and the entire battery cell 1 can complete the heating in a shorter time.

[0064] In some embodiments, the heating film 2 has two conductive connectors 26 located at its center along its thickness direction, and the two conductive connectors 26 are distributed at both ends of the battery cell 1 along its length direction L. The first heating layer 211 and the second heating layer 212 are electrically connected to the conductive connectors 26, one of which is electrically connected to the positive electrode connector 23, and the other is electrically connected to the negative electrode connector 24. At this time, the entire first heating layer 211 and the entire second heating layer 212 can serve as part of a conductive circuit, and both the first heating layer 211 and the entire second heating layer 212 can be heated.

[0065] In some embodiments of this utility model, the proportion of heating material in the first heating layer 211 gradually increases along the direction from the center of the large surface portion 11 to the edge of the large surface portion 11, or the thickness of the heating material in the first heating layer 211 gradually increases.

[0066] Specifically, when the heating material layer 21 heats up, the center of the large surface area 11 accumulates relatively more heat, resulting in significant differences in temperature across different parts of the battery cell 1. By adjusting the proportion of the heating material in the first heating layer 211 at various locations, or by adjusting the thickness of the heating material in the first heating layer 211, the heating power at different locations can be adjusted, ensuring a consistent temperature across the entire battery cell 1. Of course, the proportion and thickness of the heating material in the first heating layer 211 at various locations can be adjusted based on the size of the battery cell 1, its packaging form, the materials used, and the operating conditions; this invention does not impose any limitations on these aspects.

[0067] In some embodiments, the battery cell 1 is a short-blade battery cell made of lithium iron phosphate material. Under the charging and discharging conditions of -30°C and 120A, with the geometric center of the large surface portion 11 as the center, the proportion of heating material in the first heating layer 211 gradually increases from the center outwards, and the power density of the first heating layer 211 decreases linearly along the direction away from the center. The heating power at the edge of the large surface portion 11 is 1.5-2 times that at its center.

[0068] like Figures 4 to 5 As shown, in some embodiments of this utility model, the heating film 2 includes four bent portions 25 for covering the edges 16 of the battery cell 1, and no heating material layer 21 is provided in the bent portions 25.

[0069] Specifically, the battery cell 1 is rectangular in shape, so the outer periphery of the battery cell 1 has four edges 16. The heating film 2 is bent at the edges 16 of the battery cell 1, and the bent portion is called a bend 25, each bend 25 covering one edge 16. The heating material layer 21 may fail after bending, so the heating material layer 21 is not provided in the bend 25.

[0070] The present invention also provides a battery, which includes a housing and a plurality of cell assemblies as described above, wherein the plurality of cell assemblies are installed in the housing.

[0071] Specifically, the battery uses the cell assembly described in the above embodiment, and therefore can also achieve the above-mentioned technical effects.

[0072] In some embodiments, the battery further includes multiple temperature sensors disposed on the outer periphery of the cell 1, for example, on the large surface portion 11. The temperature sensors detect the temperature of the cell 1 and send this temperature information to the battery management system. The battery management system then activates an external power supply, simultaneously energizing the positive electrode connector 23 and the negative electrode connector 24. The heating material layer 21 can then directly heat at least two portions of the outer periphery of the cell 1 simultaneously. When the temperature sensors detect that the cell 1 has reached a preset temperature, the battery management system stops the external power supply, and the heating material layer 21 ceases to heat up.

[0073] This utility model also provides an electrical device, which includes the battery described in the above embodiments. This electrical device can specifically be a new energy vehicle, an energy storage device, or an electric motorcycle, etc., and is not limited thereto.

[0074] Specifically, the electrical device uses the battery described in the above embodiment, thus achieving the aforementioned technical effects.

[0075] 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 cell assembly, characterized in that, The device includes a battery cell (1) and a heating film (2). The heating film (2) covers the outer periphery of the battery cell (1). The heating film (2) has a heating material layer (21) inside. A positive electrode connector (23) and a negative electrode connector (24) are led out from the heating material layer (21). The positive electrode connector (23) is used to make a conductive connection with the positive electrode of the power supply, and the negative electrode connector (24) is used to make a conductive connection with the negative electrode of the power supply. When the positive electrode connector (23) and the negative electrode connector (24) are energized simultaneously, the heating material layer (21) can heat the battery cell (1) covered by the heating film (2).

2. The battery cell assembly according to claim 1, characterized in that, The power source is the battery cell (1) corresponding to the positive terminal connector (23) and the negative terminal connector (24). The positive terminal connector (23) is configured to be conductively connected to the positive terminal of the corresponding battery cell (1), and the negative terminal connector (24) is configured to be conductively connected to the negative terminal of the corresponding battery cell (1). Alternatively, the power source is an external power source, and the positive terminal connector (23) is configured to be conductively connected to the positive terminal of the external power source, and the negative terminal connector (24) is configured to be conductively connected to the negative terminal of the external power source.

3. The battery cell assembly according to claim 1, characterized in that, A heating zone is provided on the outer periphery of the battery cell (1), and the heating material layer (21) is correspondingly provided on the heating zone.

4. The cell assembly according to claim 3, characterized in that, There are at least two heating zones, and each heating zone is provided with the heating material layer (21). And / or, the heating material layer (21) includes a first part and a second part, the first part being the portion of the heating material layer (21) away from the middle of the battery cell (1), and the second part being the portion of the heating material layer (21) close to the middle of the battery cell (1), wherein the thickness of the heating material in the second part is less than the thickness of the heating material in the first part, or the content of the heating material in the second part is less than the content of the heating material in the first part.

5. The cell assembly according to claim 1, characterized in that, A conductive connector (26) is also provided. The positive electrode connector (23) is electrically connected to the heating material layer (21) through the conductive connector (26), and the negative electrode connector (24) is electrically connected to the heating material layer (21) through the conductive connector (26).

6. The cell assembly according to claim 5, characterized in that, A heat-conducting component (27) is also provided, wherein at least a portion of the heat-conducting component (27) is connected to the conductive connector (26), and at least a portion of the heat-conducting component (27) is insulated and thermally conductively contacted with the end face where the positive or negative electrode of the battery cell (1) is located, or is connected to the positive or negative electrode of the battery cell (1); Alternatively, at least a portion of the heat-conducting element (27) is connected to the heating material layer (21), and at least a portion of the heat-conducting element (27) is in insulating and thermally conductive contact with the end face where the positive or negative electrode of the battery cell (1) is located; Alternatively, at least a portion of the heat-conducting element (27) is connected to the positive electrode connector (23), and at least a portion of the heat-conducting element (27) is connected to the positive electrode end face of the battery cell (1), and / or, at least a portion of the heat-conducting element (27) is connected to the negative electrode connector (24), and at least a portion of the heat-conducting element (27) is connected to the negative electrode end face of the battery cell (1).

7. The cell assembly according to claim 1, characterized in that, The battery cell (1) is rectangular in shape and includes two large surface portions (11) spaced apart along its width direction and a narrow surface portion (12) located at its top. The heating material layer (21) is capable of heating at least one of the large surface portions (11) and the narrow surface portion (12).

8. The cell assembly according to claim 7, characterized in that, The heating material layer (21) includes two first heating layers (211) and one second heating layer (212). The two first heating layers (211) can heat the two large surface portions (11) respectively, and the second heating layer (212) can heat the narrow surface portion (12). The second heating layer (212) is located between the two first heating layers (211) and is spaced apart from each other. And / or, the heating film (2) includes four bends (25) for covering the edges (16) of the battery cell (1), wherein the heating material layer (21) is not disposed in the bends (25).

9. A battery, characterized in that, It includes a housing and a plurality of battery cell assemblies as described in any one of claims 1-8, wherein the plurality of battery cell assemblies are mounted in the housing.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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