Battery device and electric device

Abstract

The embodiment of the utility model discloses a battery device and a power utilization device, and the battery device comprises a box body which is internally provided with a containing space and is provided with a bottom plate; the structural beam is arranged in the containing space, and an avoiding space is formed by the structural beam; the plurality of battery cells are arranged in the accommodating space; a heating film disposed between the bottom plate and the plurality of battery cells; the connecting wire harness is electrically connected with the heating film, and at least part of the connecting wire harness is contained in the avoiding space. According to the battery device provided by the embodiment of the invention, by arranging the avoiding space, the length required by the connecting wire harness is reduced, and meanwhile, the exposed area of the connecting wire harness at the bottom of the battery monomers can be reduced, so that the bottom space of the plurality of battery monomers occupied by the connecting wire harness can be reduced; the bonding area of the bottoms of the battery monomers and the heating film or the bottom plate is effectively increased, so that the mounting stability of the battery monomers can be improved, and the risk that the battery device is damaged due to vibration impact is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery device and an electrical device. Background Art

[0002] In the prior art, a heating film is generally arranged on the side of multiple battery cells or between two adjacent battery cells. This arrangement occupies the space inside the box body in the length direction or the width direction to a certain extent, resulting in a reduction in the number of battery cells that can be arranged in a housing cavity of the same size. To solve the above problems, a heating film arranged at the bottom has been proposed currently, so that the connecting wire harness can be routed at the bottom of the battery cell. However, routing at the bottom makes the connecting wire harness at risk of being squeezed, and there are often structural beams arranged in the existing box body. When the connecting wire harness encounters a structural beam, it needs to be electrically connected to the heating film by bypassing or climbing. In this way, problems such as a large amount of wire harness used, high heat generation, and a large area required for arrangement are caused. Summary of the Utility Model

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. For this reason, the present application provides a battery device, and the battery device can reduce the risk of being damaged due to vibration and impact by providing an avoidance space on the structural beam.

[0004] The present application also provides an electrical device having the above battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, which includes: a box body, an accommodation space is formed inside the box body, the box body has a bottom plate, a structural beam is arranged in the accommodation space, and the structural beam forms an avoidance space; multiple battery cells, the multiple battery cells are arranged in the accommodation space; a heating film, the heating film is arranged between the bottom plate and the multiple battery cells; a connecting wire harness, electrically connecting the heating film, and at least part of the connecting wire harness is received in the avoidance space.

[0006] In the above technical solution, by providing an avoidance space on the structural beam, the connecting wire harness does not need to bypass the structural beam when routing, which is beneficial to reducing the length of the connecting wire harness. At the same time, it can also reduce the exposed area of the connecting wire harness at the bottom of the battery cell, thereby reducing the space occupied by the connecting wire harness. Therefore, it can effectively increase the bonding area between the bottom of the multiple battery cells and the heating film or the bottom plate, and further improve the installation stability of the multiple battery cells, thereby reducing the risk of the battery device being damaged due to vibration and impact; in addition, it can also reduce the risk of the connecting wire harness being squeezed or worn.

[0007] In some embodiments, the heating film includes a plurality of heating sheets, and the plurality of heating sheets are arranged at intervals.

[0008] In the above technical solution, by providing a plurality of heating sheets, the heating film can contact more battery cells, enabling each battery cell to be heated. Thus, the heating effect of the heating film can be further improved, and furthermore, multiple battery cells can also operate at an appropriate temperature in a low-temperature environment, thereby enhancing the service life of the battery device. At the same time, the layout of the heating sheets can be adjusted according to the actual situation, thereby improving the applicability of the heating film. By providing the plurality of heating sheets with an interval therebetween, the bonding area between the multiple battery cells and the bottom plate can be increased, thereby improving the installation stability of the multiple battery cells.

[0009] In some embodiments, the connection harness includes a first connection harness, and the first connection harness is electrically connected to two heating sheets. The structural beam includes a first beam, and an avoidance groove is formed on the first beam, and at least a part of the first connection harness is received in the avoidance groove.

[0010] In the above technical solution, by providing the first connection harness, the layout area of the heating film can be effectively reduced. Furthermore, the amount of structural adhesive at the bottom of the battery cell can be increased, thereby improving the installation stability of the multiple battery cells and enhancing the reliability of the battery device. By providing the avoidance groove, protection can be provided to the first connection harness, reducing the possibility of the first connection harness being damaged by the pressure of the battery cell.

[0011] In some embodiments, the heating sheets extend in a first direction, and multiple battery cells are arranged in the first direction to form a battery cell assembly. The number of battery cell assemblies is multiple, and at least one heating sheet is arranged at the bottom of each battery cell assembly. The first direction is the thickness direction of the battery cell.

[0012] In the above technical solution, by arranging multiple battery cells in the first direction to form a battery cell assembly, and arranging at least one heating sheet extending in the first direction at the bottom of each battery cell assembly, while ensuring that the heating film heats the multiple battery cells, the number of heating sheets can be reduced, thereby improving the assembly efficiency of the battery device.

[0013] In some embodiments, the plurality of heating sheets correspond to the plurality of battery cell assemblies one by one. In a second direction perpendicular to the first direction, the edge of the battery cell assembly extends beyond the heating sheet provided corresponding thereto.

[0014] In the above technical solution, by setting the edge of the battery cell assembly to extend beyond the heating sheet provided corresponding thereto in the second direction, the heating rate of the battery cell assembly can be increased, so that the battery device can quickly reach the operating temperature and enter the operating state.

[0015] In some embodiments, in the first direction, both ends of the heating sheet extend beyond the end edges of both ends of the battery cell assembly.

[0016] In the above technical solution, by setting both ends of the heating sheet to extend beyond the end edges of both ends of the battery cell assembly in the first direction, the heating effect of the heating film on the battery cell assembly can be further improved.

[0017] In some embodiments, the connection wire harness includes a second connection wire harness, and the second connection wire harness is electrically connected to the heating film; the structural beam includes a second beam, and the second beam divides the accommodation space into an electrical compartment and an accommodation cavity. The battery cell is disposed in the accommodation cavity, and the second beam is formed with an avoidance hole penetrating through the second beam, and the second connection wire harness extends into the electrical compartment through the avoidance hole.

[0018] In the above technical solution, by providing the avoidance hole, the second connection wire harness can extend into the electrical compartment without climbing over the second beam. In this way, it is beneficial to reduce the wiring length, and at the same time, it can also reduce the occupied space of the second connection wire harness on the side of the battery cell. Furthermore, it is beneficial to arrange more battery cells in the accommodation cavity of the same size, and it can also reduce the influence of the heat generated by the wire harness on the battery cell.

[0019] In some embodiments, the battery device further includes: a cooling part, the cooling part has a flow channel for passing a heat-conducting medium, and the cooling part and the heating film are located on the same side of the battery cell.

[0020] In the above technical solution, by providing the cooling part, the risk of overheating of the battery cell during use can be reduced.

[0021] In some embodiments, the heating film is located between the cooling part and the battery cell; the heating film includes a plurality of heating sheets arranged at intervals, and a part of the cooling part is exposed outside the heating sheets.

[0022] In the above technical solution, by providing a part of the cooling part to be exposed outside the heating sheets, it is beneficial to improve the cooling effect of the cooling part on the battery cell. On the one hand, it is beneficial to improve the working stability of the battery cell, and on the other hand, it is beneficial to reduce the possibility of thermal runaway of the battery cell.

[0023] In a second aspect, an embodiment of the present application further provides an electrical device, including the battery device according to the first aspect of the present application, and the battery device is used to provide electrical energy.

[0024] In the above technical solution, by providing the battery device of the embodiment in the first aspect above, the overall performance of the electrical device is improved.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0028] Figure 3 is Figure 2 a partial explosion diagram of the battery device shown in

[0029] Figure 4 is Figure 3 a schematic diagram of the heating film shown in

[0030] Figure 5 a partial schematic diagram of a battery device according to an embodiment of the present application from one angle;

[0031] Figure 6 is a partial schematic diagram of a battery device according to an embodiment of the present application from another angle;

[0032] Figure 7 is a partial schematic diagram of a battery device according to an embodiment of the present application from yet another angle.

[0033] Reference numerals:

[0034] 1000, vehicle;

[0035] 100, battery device;

[0036] 10, box body; 101, accommodation cavity; 102, electrical compartment; 1, structural beam; 11, first beam; 111, avoidance groove; 12, second beam; 121, avoidance hole; 13, bottom plate; 14, side beam; 15, cover plate; 16, front cross beam;

[0037] 20, battery cell;

[0038] 30, heating film; 311, heating sheet;

[0039] 40, connection wire harness; 41, first connection wire harness; 42, second connection wire harness;

[0040] 50, cooling part;

[0041] 200, controller; 300, motor. Detailed implementation manners

[0042] [[ID=5⑨]]Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

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

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

[0045] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two).

[0048] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. 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 specific situations.

[0050] Currently, from the perspective of the development of the market situation, 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 plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0051] During the use of the battery, since the natural temperature applicable range of the battery is generally limited, in a cold environment, the chemical performance of the battery decreases, resulting in limited battery performance. To improve the comprehensive performance of the battery under low-temperature conditions, a heating system is usually designed. Among them, it is more common to use a heating film. In the prior art, a part of the heating film is arranged on the side of multiple battery cells between adjacent two battery cells, and this arrangement method occupies the space inside the box in the length direction or the width direction to a certain extent, which leads to a reduction in the number of battery cells that can be arranged in the accommodation cavity of the same size. In addition, since the heating film needs to be powered on to work, corresponding power supply wiring harnesses also need to be arranged, and these wiring harnesses need to be routed from the side of the battery cells during layout. Therefore, it will further occupy the internal space of the box. To solve the above problems, a solution of arranging the heating film at the bottom of the battery is proposed in the related art to reduce the occupation of the side space of the battery by the heating film. However, the connecting wiring harness of the bottom-mounted heating film needs to be routed at the bottom of the battery cells. In the existing box, there are often structural beams arranged, and the connecting wiring harness needs to bypass the structural beams during routing. In this way, the routing distance of the connecting wiring harness is long, the connecting wiring harness may be damaged by the extrusion between the battery and the structural beam, and the insulating layer of the connecting wiring harness may also be damaged due to friction with the structural beam.

[0052] Based on the above considerations, in order to solve the problems of long wiring distance and high damage risk of the connection wire harness, an embodiment of the present application provides a battery device, which includes: a box body, a plurality of battery cells, a heating film and a connection wire harness. An accommodation cavity is formed inside the box body, the box body has a bottom plate, a structural beam is provided in the accommodation cavity, and an avoidance space is formed in the structural beam; the plurality of battery cells are arranged in the accommodation cavity; the heating film is arranged between the bottom plate and the plurality of battery cells; the connection wire harness is electrically connected to the heating film, and at least part of the connection wire harness is received in the avoidance space. In this way, it can be made that the connection wire harness does not need to bypass the structural beam when wiring, which is beneficial to reducing the length of the connection wire harness. At the same time, it can also reduce the exposed area of the connection wire harness at the bottom of the battery cell, thereby reducing the space occupied by the connection wire harness. Therefore, it can also effectively increase the bonding area between the bottom of the plurality of battery cells and the heating film or the bottom plate, and then improve the installation stability of the plurality of battery cells, thereby reducing the risk of damage to the battery device due to vibration and impact; in addition, it can also reduce the risk of the connection wire harness being squeezed or worn.

[0053] The battery device disclosed in the embodiment of the present application can be used in an electrical device using a battery as a power source or various energy storage systems using a battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0054] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device in an embodiment of the present application, is taken as an example for description.

[0055] Referring to Figure 1 , Figure 1 is a schematic diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0056] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, providing driving power for the vehicle 1000 instead of or partially replacing fuel or natural gas.

[0057] Referring to Figure 2 and Figure 3 , Figure 2 is a schematic diagram of the battery device 100 according to some embodiments of the present application, Figure 3 is a partial exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 includes a box body 10 and battery cells 20. The box body 10 forms a cavity, and the battery cells 20 are accommodated in the cavity of the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part (such as the frame described below), a second part (such as the bottom plate 13 described below), and a third part (such as the cover plate 15 described below). The frame and the bottom plate 13 are connected to form a lower box body, and the lower box body is connected to the cover plate 15 to jointly define an accommodation cavity 101 for accommodating the battery cells 20. The lower box body can be a hollow structure with one end open, and the cover plate 15 can be a plate-like structure. The cover plate 15 covers the open side of the lower box body to close the open side of the lower box body; the lower box body and the cover plate 15 can also both be hollow structures with one side open, and the open side of the lower box body covers the open side of the cover plate 15. Of course, the box body 10 formed by the lower box body and the cover plate 15 can be of various shapes, such as a cylinder, a cuboid, etc. The box body 10 may further include a bottom guard plate, and the bottom guard plate is connected to the lower side of the bottom plate 13 to increase the structural strength of the bottom plate 13.

[0058] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0059] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0060] Next, referring to Figures 3 - 7Describe the battery device 100 according to the embodiments of the first aspect of the present application. Figure 3 is a partial explosion view of the battery device 100 according to some embodiments of the present application; Figure 4 is Figure 3 a schematic diagram of the heating film 30 shown in Figure 5 is a partial schematic view of the battery device 100 from one angle according to some embodiments of the present application; Figure 6 is a partial schematic view of the battery device 100 from another angle according to some embodiments of the present application; Figure 7 is a partial schematic view of the battery device 100 from yet another angle according to some embodiments of the present application.

[0061] Embodiments of the present application provide a battery device 100. Referring to Figure 3 , the battery device 100 includes: a box body 10, a structural beam 1, a plurality of battery cells 20, a heating film 30, and a connection wire harness 40.

[0062] Among them, the box body 10 is the main load-bearing component of the battery pack, mainly providing a load-bearing space for the plurality of battery cells 20 and the heating film 30, and can also be used to protect the battery cells 20; the plurality of battery cells 20 are the core components of the battery device 100, mainly used for storing and releasing energy; the heating film 30 is mainly used for heating the plurality of battery cells 20 so that the battery device 100 can work normally in a low-temperature environment; the connection wire harness 40 is electrically connected to the heating film 30 so that the heating film 30 forms a closed loop with an external power source, thereby realizing the energization of the heating film 30.

[0063] Specifically, an accommodation space is formed inside the box body 10, and the box body 10 has a bottom plate 13; the structural beam 1 is arranged in the accommodation space, and the structural beam 1 forms an avoidance space; the plurality of battery cells 20 are arranged in the accommodation space; the heating film 30 is arranged between the bottom plate 13 and the plurality of battery cells 20; the connection wire harness 40 is electrically connected to the heating film 30, and at least part of the connection wire harness 40 is received in the avoidance space.

[0064] Among them, the accommodation space provides an installation space for the plurality of battery cells 20 and the heating film 30, and the bottom plate 13 is mainly used for carrying and protecting the plurality of battery cells 20; the structural beam 1 can play a supporting and fixing role and can increase the structural strength of the box body 10.

[0065] It should be noted that the structural beam 1 can be a cross beam extending along the width direction of the box body 10, or a longitudinal beam extending along the length direction. It can also be understood that the structural beam 1 can include both a cross beam and a longitudinal beam, and there is no limitation here.

[0066] "The heating film 30 is disposed between the bottom plate 13 and the plurality of battery cells 20". It can be understood that the heating film 30 is disposed at the bottom of the plurality of battery cells 20, and the connection wire harness 40 is electrically connected to the heating film 30. Thus, it can be understood that at least a part of the connection wire harness 40 is also disposed at the bottom of the plurality of battery cells 20. It should be noted that the connection wire harness 40 in the above embodiment may be a connection wire harness 40 that electrically connects the heating film 30 to a power source, or may be a connection wire harness 40 used for series or parallel connection between two heating films, and no limitation is made here.

[0067] "At least a part of the connection wire harness 40 is received in the avoidance space" is intended to illustrate that the connection wire harness 40 may be partially received in the avoidance space, or may be entirely received in the avoidance space. Among them, when a part of the connection wire harness 40 is received in the avoidance space, it can be understood that a part of the connection wire harness 40 is placed in the pre-designed avoidance space, and the remaining part may be exposed outside the avoidance space due to layout requirements, length limitations or other considerations. For example, when the connection wire harness 40 is a connection wire harness 40 that electrically connects the heating film 30 to a power source, the connection wire harness 40 needs to pass through the structural beam 1. Thus, a part of the connection wire harness 40 is exposed outside the avoidance space.

[0068] When the connection wire harness 40 is entirely received in the avoidance space, it can be understood that all of the connection wire harness 40 is arranged in the designated avoidance space. For example, when the connection wire harness 40 is a connection wire harness 40 for the heating film 30 to be connected to itself, since both the heating film 30 and the structural beam 1 are disposed in the accommodation cavity 101, thus, the connection wire harness 40 can be entirely arranged in the avoidance space.

[0069] In the prior art, the heating film 30 is generally disposed on the side of the plurality of battery cells 20, or disposed between two adjacent battery cells 20. This arrangement method occupies the space inside the box body 10 in the length direction or the width direction to a certain extent, resulting in a reduction in the number of battery cells 20 that can be disposed in the accommodation cavity 101 of the same size. In addition, the connection wire harness 40 for supplying power to the heating film 30 needs to be routed from the side of the battery cell 20 during layout. Thus, it will further occupy the internal space of the box body 10. To solve the above problems, a solution of disposing the heating film 30 at the bottom of the battery is proposed in the related art to reduce the occupation of the side space of the battery by the heating film 30. However, the connection wire harness 40 of the bottom-mounted heating film 30 needs to be routed at the bottom of the battery cell 20. There are often structural beams 1 disposed in the existing box body 10, and the connection wire harness 40 needs to bypass the structural beam 1 during routing. In this way, the routing distance of the connection wire harness 40 is long, the connection wire harness 40 may be damaged by the extrusion of the battery and the structural beam 1, and the insulating layer of the connection wire harness 40 may also be damaged due to friction with the structural beam 1.

[0070] In this embodiment, at least part of the connection wire harness 40 is received in the avoidance space, which enables the connection wire harness 40 to directly pass through the structural beam 1 when routing, without having to bypass the structural beam 1. Thus, it is beneficial to reduce the required length of the connection wire harness 40. At the same time, since at least part of the connection wire harness is received in the avoidance space, the exposed area of the connection wire harness 40 at the bottom of the battery cell 20 can be reduced, thereby reducing the space occupied by the connection wire harness 40, effectively increasing the bonding area between the bottoms of multiple battery cells 20 and the heating film 30 or the bottom plate 13, and further improving the installation stability of the battery cell assembly and reducing the risk of damage to the battery device 100 due to vibration and shock. In addition, the structural beam 1 protects at least part of the wire harness, thereby reducing the risk of the connection wire harness 40 being squeezed or worn.

[0071] In some embodiments, the heating film 30 includes a plurality of heating sheets 311, and the plurality of heating sheets 311 are arranged at intervals.

[0072] Exemplarily, in this embodiment, the plurality of heating sheets 311 can be arranged in one-to-one correspondence with the plurality of battery cells 20, or one heating sheet 311 can be used for heating a plurality of battery cells 20. The layout of the plurality of heating sheets 311 can be adjusted according to the layout and design requirements of the plurality of battery cells 20.

[0073] For example, the number of heating sheets 311 can be two, three or more.

[0074] In the above technical solution, by providing a plurality of heating sheets 311, the heating film 30 can contact more battery cells 20, enabling each battery cell 20 to be heated. Thus, the heating effect of the heating film 30 can be further improved, and the plurality of battery cells 20 can also operate at a suitable temperature in a low-temperature environment, thereby increasing the service life of the battery device 100. At the same time, the layout of the heating sheets 311 can be adjusted according to the actual situation, thereby improving the applicability of the heating film 30. By arranging the plurality of heating sheets 311 at intervals, the bonding area between the plurality of battery cells 20 and the bottom plate 13 can be increased, thereby improving the installation stability of the plurality of battery cells 20.

[0075] In some embodiments, the connection wire harness 40 includes a first connection wire harness 41, and the first connection wire harness 41 is electrically connected to two heating sheets 311.

[0076] It can be understood that the first connection wire harness 41 is mainly used to connect two heating sheets 311 in series to energize the two heating sheets 311. It should be noted that the plurality of heating sheets 311 are connected by a plurality of first connection wire harnesses 41, and a heating film 30 arranged in a U-shape or an S-shape can be formed.

[0077] In the related art, each heating film 30 includes at least one heating element. The heating element includes a first part and a second part that extend in parallel, and a third part connected to the ends of the first part and the second part, such that the heating element is U-shaped. Among them, the third part is a flat plate structure with a certain width, which results in an increase in the layout space required for the entire heating film. As a result, to a certain extent, the space at the bottom of the battery cell assembly for filling structural adhesive is compressed, reducing the coating amount of the structural adhesive, and further affecting the installation stability and use reliability of the battery cell.

[0078] In the above embodiment, two adjacent heating sheets 311 are connected by a first connection wire harness 41, which is beneficial to reducing the layout area of the heating film 30. Furthermore, the amount of structural adhesive at the bottom of the battery cell 20 can be increased, thereby improving the installation stability of multiple battery cells 20 and enhancing the reliability of the battery device 100.

[0079] In some embodiments, the structural beam 1 includes a first beam 11, and an avoidance groove 111 is formed on the first beam 11. At least a part of the first connection wire harness 41 is received in the avoidance groove 111.

[0080] It can be understood that the first connection wire harness 41 can be partially arranged in the avoidance groove 111 or entirely arranged in the avoidance groove 111. Thus, when at least a part of the first connection wire harness 41 is received in the avoidance groove 111, the first beam 11 can protect the first connection wire harness 41. Furthermore, when multiple battery cells 20 are arranged in the box body 10, they will not press on the first connection wire harness 41, and thus the connection reliability of the first connection wire harness 41 can be improved.

[0081] For example Figures 4 - 5 As shown, each heating film 30 includes two heating sheets 311. The ends of the two heating sheets 311 are connected in series by a first connection wire harness 41 to form a U-shaped structure. An avoidance groove 111 extending along the extension direction of the first connection wire harness 41 is formed on the first beam 11, and the first connection wire harness 41 is arranged in the avoidance groove 111.

[0082] For example Figure 5 As shown, the avoidance groove 111 extends in the left-right direction and penetrates the bottom wall of the first beam 11 and the side wall of the first beam 11 facing the second beam 12. In this way, it is convenient to arrange the first connection wire harness 41, reducing the possibility of interference between the first beam 11 and the first connection wire harness 41. At the same time, since the avoidance groove 111 provides avoidance for the first connection wire harness 41, it is also beneficial to reduce the possibility of the first beam 11 squeezing the first connection wire harness 41 and causing damage to the first connection wire harness 41.

[0083] It should be noted that the number of the avoidance grooves 111 can be the same as that of the first connecting wire harnesses 41, and the size of the avoidance grooves 111 can be designed according to the size of the first connecting wire harnesses 41. Multiple first connecting wire harnesses 41 can also be accommodated in the same avoidance groove 111.

[0084] It should be noted that the first beam 11 can be a cross beam or a longitudinal beam, and there is no limitation here.

[0085] In the above technical solution, by arranging the first connecting wire harnesses 41, the layout area of the heating film 30 can be effectively reduced, and then the amount of structural adhesive at the bottom of the battery cells 20 can be increased, thereby improving the installation stability of multiple battery cells 20 and the reliability of the battery device 100. By arranging the avoidance grooves 111, protection can be provided for the first connecting wire harnesses 41, and the possibility of the first connecting wire harnesses 41 being damaged by the pressure of the battery cells 20 can be reduced.

[0086] In some embodiments, referring to Figures 3 - 4 , the heating sheet 311 extends along the first direction (for example, Figure 3 the direction from front to back in ), multiple battery cells 20 are arranged along the first direction to form a battery cell assembly, the number of the battery cell assemblies is multiple, at least one heating sheet 31 is arranged at the bottom of each battery cell assembly, and the first direction is the thickness direction of the battery cells 20.

[0087] It can be understood that the number of the battery cell assemblies can be two, three or more, and one or more heating sheets 311 can be arranged at the bottom of each battery cell assembly. Among them, the heating sheet 311 extends along the first direction. Furthermore, the extending direction of the heating sheet 311 is the same as the arrangement direction of the multiple battery cells 20. Thus, one heating sheet 311 can heat multiple battery cells 20 in the same group.

[0088] Exemplarily, when one heating sheet 311 is arranged at the bottom of each battery cell assembly, the heating sheet 311 can be arranged at the middle position of the battery cell assembly; when multiple heating sheets 311 are arranged at the bottom of each battery cell assembly, the heating sheets 311 can be arranged at intervals along the length direction of the battery cells 20. The specific number and arrangement position of the heating sheets 311 can be designed according to the actual situation.

[0089] It should be noted that the battery cell assembly can be a battery module. The battery cell assembly can be accommodated in the box body 10 by fixing the battery module in the box body 10; it can also be accommodated in the box body 10 by directly fixing multiple battery cells 20 in the box body 10.

[0090] In the above technical solution, by arranging a plurality of battery cells 20 in a first direction to form a battery cell assembly, and arranging at least one heating sheet 311 extending in the first direction at the bottom of each battery cell assembly, while ensuring that the heating film 30 heats the plurality of battery cells 20, the number of heating sheets 311 can be reduced, thereby improving the assembly efficiency of the battery device 100.

[0091] In some embodiments, referring to Figure 3 , a plurality of heating sheets 311 correspond to the plurality of battery cell assemblies one by one. In a second direction (for example, Figure 3 the direction from left to right as shown), the edge of the battery cell assembly extends beyond the heating sheet 311 arranged corresponding thereto, and the second direction is perpendicular to the first direction.

[0092] Exemplarily, the first direction is the thickness direction of the battery cell 20, which is also the length direction of the battery device 100, and the second direction is the width direction of the battery cell 20, which is also the width direction of the battery device 100. Specifically, a plurality of battery cells 20 are stacked in the thickness direction of the battery cell 20 to form a battery cell assembly, and a plurality of battery cell assemblies are arranged at intervals in the width direction of the battery cell 20 to form a battery module or are directly fixed at intervals in the width direction of the battery cell 20 in the box body 10.

[0093] "In the second direction, the edge of the battery cell assembly extends beyond the heating sheet 311 arranged corresponding thereto" can be understood as that in the width direction of the battery cell 20, the heating sheet 311 is arranged at a non-edge position at the bottom of the battery cell 20, that is to say, the heating sheet 311 can be arranged at the middle position or a position close to the middle position of the battery cell assembly.

[0094] It should be noted that when the battery device 100 operates in a low-temperature working condition environment, it is necessary to use the heating film 30 to heat the plurality of battery cells 20. The heating sheet 311 is arranged at a non-edge position of the battery cell assembly, so that the heat of the heating sheet 311 is concentrated on the electrode assembly in the battery cell 20, improving the heating efficiency of the battery cell, so that the battery device 100 can quickly reach an appropriate working temperature. Among them, the electrode assembly is arranged in the housing of the battery cell, and the electrode assembly may include a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet.

[0095] In the above technical solution, by setting the edge of the battery cell assembly to extend beyond the heating sheet 311 arranged corresponding thereto in the second direction, the heating speed of the battery cell assembly can be increased, so that the battery device 100 can quickly reach the working temperature and enter the working state.

[0096] In some embodiments, in the first direction, both ends of the heating sheet 311 extend beyond the end edges of both ends of the battery cell assembly.

[0097] It should be noted that the first direction is the length direction of the battery device 100. Thus, "in the first direction, both ends of the heating sheet 311 extend beyond the end edges of both ends of the battery cell assembly" is intended to mean that in the first direction, the length of the heating sheet 311 is greater than the length of the battery cell assembly. In this way, the heating sheet 311 can heat multiple battery cells 20 of the battery cell assembly, and further improve the heating effect of the heating film 30 on the battery cell assembly.

[0098] In the above technical solution, by setting both ends of the heating sheet 311 to extend beyond the end edges of both ends of the battery cell assembly in the first direction, the heating effect of the heating film 30 on the battery cell assembly can be further improved.

[0099] In some embodiments, referring to Figure 4 and Figure 6 , the connection wire harness 40 includes a second connection wire harness 42, and the second connection wire harness 42 is electrically connected to the heating film 30. Specifically, the second connection wire harness 42 is mainly used to be connected to a power source to energize the heating film 30.

[0100] The structural beam 1 includes a second beam 12. The second beam 12 divides the accommodation space into an electrical compartment 102 and an accommodation cavity 101. A plurality of battery cells 20 are arranged in the accommodation cavity 101. The second beam 12 is formed with an avoidance hole 121 penetrating through the second beam 12, and the second connection wire harness 42 extends into the electrical compartment 102 through the avoidance hole 121.

[0101] Specifically, the electrical compartment 102 is an important part of the battery pack, mainly used to accommodate and protect electrical components, such as an electronic control assembly; a plurality of battery cells 20 and the heating film 30 are mainly arranged in the accommodation cavity 101. The second connection wire harness 42 passes through the avoidance hole 121 and extends into the electrical compartment 102 to achieve connection with the power source. Specifically, the electronic control assembly is electrically connected to the battery cells 20, and the heating film 30 is electrically connected to the electronic control assembly, so that the battery cells 20 supply power to the heating film 30.

[0102] For example Figures 4 - 7As shown in the figure, a heating film 30 includes two heating sheets 311 extending in the front-rear direction. At one end of the two heating sheets 311 facing the second beam 12, second connection wire harnesses 42 are respectively connected. The second connection wire harnesses 42 are adapted to pass through the avoidance holes 121 and extend into the electrical bin 102 to be connected to an external power source, so that the heating film 30 is energized. One ends of the two heating sheets 311 facing away from the first connection wire harness 41 are connected in series through the first connection wire harness 41, so that the heating film 30 forms a closed loop. It should be noted that one of the two second connection wire harnesses 42 at the ends of the two heating sheets 311 facing the second beam 12 is a positive connection wire harness, and the other is a negative connection wire harness. Thus, it can be understood that the positive connection wire harness and the negative connection wire harness are arranged on the same side of the heating sheet 311, and are arranged on the side of the heating sheet 311 facing the electrical bin 102. Therefore, it is beneficial to reduce the wire routing length and improve the assembly convenience of the heating film 30.

[0103] For example Figure 5 As shown in the figure, both the first beam 11 and the second beam 12 are cross beams. The first beam 11 and the second beam 12 together with the two side beams 14 jointly define an accommodation cavity 101. The box body 10 further includes: a front cross beam 16. Among them, the second beam 12, the front cross beam 16 and the two side beams 14 jointly define an electrical bin 102.

[0104] Optionally, when the second beam 12 is a profile, the avoidance hole 121 can be formed by machining and milling; when the second beam 12 is a stamping beam, the avoidance hole 121 can be formed by machining or integrally formed by a stamping structure.

[0105] In the above technical solution, by providing the avoidance holes 121, the second connection wire harness 42 can extend into the electrical bin 102 without climbing over the second beam 12. In this way, it is beneficial to reduce the wire routing length. At the same time, it can also reduce the occupied space of the second connection wire harness 42 on the side of the battery cell 20. Furthermore, it is beneficial to arrange more battery cells 20 in the accommodation cavity 101 of the same size, and it can also reduce the influence of the heat generated by the wire harness on the battery cell 20.

[0106] In some embodiments, referring to FIGS. 3 and Figure 7 , the battery device 100 further includes: a cooling part 50. The cooling part 50 has a flow channel for passing a heat-conducting medium. The cooling part 50 and the heating film 30 are located on the same side of the battery cell 20.

[0107] It can be understood that the cooling part 50 can be used to exchange heat with the battery cell 20 to adjust and control the working temperature of the battery device 100, ensure that the battery device 100 can operate within a suitable temperature range, and thus can improve the operation reliability of the battery device 100.

[0108] It should be noted that the cooling part 50 can be a separate cold plate or a part of the bottom plate 13. When the cooling part 50 is a part of the bottom plate 13, the bottom plate 13 is formed with a flow channel for the heat-conducting medium to flow through.

[0109] In the above technical solution, by providing the cooling part 50, the risk of overheating of the battery cell 20 during use can be reduced.

[0110] In some embodiments, referring to Figure 7 , the heating film 30 is located between the cooling part 50 and the battery cell 20; the heating film 30 includes a plurality of heating sheets 311 arranged at intervals, and a part of the cooling part 50 is exposed outside the heating sheets 311.

[0111] In the above technical solution, by providing a part of the cooling part to be exposed outside the heating sheet, it is beneficial to improve the cooling effect of the cooling part 50 on the battery cell 20. On the one hand, it is beneficial to improve the working stability of the battery cell 20, and on the other hand, it is beneficial to reduce the possibility of thermal runaway of the battery cell 20.

[0112] In some embodiments, the battery device 100 further includes: a protective member sleeved on the radial outer side of the first connection wire harness 41 and / or the second connection wire harness 42.

[0113] It can be understood that the protective member can be sleeved only on the radial outer side of the first connection wire harness 41, or only on the radial outer side of the second connection wire harness 42, or the protective member can be sleeved on both the first connection wire harness 41 and the second connection wire harness 42.

[0114] Specifically, the protective member mainly plays a role in protecting the wire harness, and can effectively isolate the wire harness from the peripheral edge of the avoidance groove 111 or the avoidance hole 121. Furthermore, the risk of damage to the wire harness caused by friction with the peripheral edge of the avoidance groove 111 or the avoidance hole 121 can be reduced, thereby improving the working reliability of the heating film 30.

[0115] It should be noted that the protective member can be made of an insulating and wear-resistant material. For example, the protective member can be a polyurethane material part. In this way, while the protective member plays a protective role, the insulation of the wire harness can be ensured.

[0116] In the above technical solution, by providing the protective member, it can play a protective role on the first connection wire harness 41 and / or the second connection wire harness 42, and can effectively reduce the risk of damage to the wire harness caused by friction with the peripheral edge of the avoidance groove 111 or the avoidance hole 121, thereby improving the working reliability of the heating film 30.

[0117] In a second aspect, an embodiment of the present application further provides an electrical device, including the battery device 100 according to the first aspect of the present application, and the battery device 100 is used to provide electrical energy.

[0118] In the above technical solution, by providing the battery device 100 of the first aspect embodiment above, the overall performance of the electrical device is improved.

[0119] Next, reference will be made to Figures 3 - 7 describe the battery device 100 according to a specific embodiment of the present application.

[0120] Refer to Figure 3 , the battery device 100 includes: a box body 10, a plurality of battery cells 20, a heating film 30, a connection wire harness 40 and a water-cooling plate. Among them, the box body 10 has a receiving cavity 101, and a plurality of battery cells 20 are arranged in the receiving cavity 101; the box body 10 also has a bottom plate 13, the water-cooling plate is arranged on one side of the bottom plate 13 facing the plurality of battery cells 20, and the heating film 30 is arranged between the water-cooling plate and the plurality of battery cells 20; the connection wire harness 40 includes a first connection wire harness 41 and a second connection wire harness 42, wherein the second connection wire harness 42 is connected to both ends of the heating film 30 and is connected to an external power supply to energize the heating film 30.

[0121] Specifically, a plurality of battery cells 20 are stacked in the front-rear direction to form a battery cell assembly, and the number of battery cell assemblies is multiple. The multiple battery cell assemblies are arranged at intervals in the left-right direction in the receiving cavity 101.

[0122] The number of heating films 30 is one or more. The multiple heating films 30 are arranged at intervals in the left-right direction. Each heating film 30 includes two heating sheets 311 extending in the front-rear direction and arranged at intervals in the left-right direction. One ends of the two heating sheets 311 are connected in series through the first connection wire harness 41, and second connection wire harnesses 42 are connected to the other ends of the two heating sheets 311. In addition. The number of heating sheets 311 corresponds one-to-one to the number of battery cell assemblies, and in the left-right direction, the heating sheets 311 are arranged at the middle position of the battery cell assemblies, and in the front-rear direction, both ends of the heating sheets 311 extend beyond the end edges of both ends of the battery cell assemblies.

[0123] A first beam 11 and a second beam 12 extending in the left-right direction are provided in the box body 10. Among them, the first beam 11 and the second beam 12 are arranged at intervals in the front-rear direction. The second beam 12 divides the space in the box body 10 into an electrical compartment 102 and a receiving cavity 101, and the receiving cavity 101 is located between the first beam 11 and the second beam 12.

[0124] Specifically, the second beam 12 is formed with an avoidance hole 121 penetrating the second beam 12 in the front-rear direction. The second connection wire harness 42 passes through the avoidance hole 121 and extends into the electrical compartment 102. An avoidance groove 111 is formed on the second beam 12, and the second connection wire harness 42 is arranged in the avoidance groove 111.

[0125] In addition, the battery device 100 further includes: a protective member sleeved on the radial outer sides of the first connection wire harness 41 and the second connection wire harness 42.

[0126] In the above technical solution, by providing an avoidance space on the structural beam 1, the connection wire harness 40 does not need to bypass the structural beam 1 when routing, which is beneficial to reducing the length of the connection wire harness 40. At the same time, it can also reduce the exposed area of the connection wire harness 40 at the bottom of the battery cell 20, thereby reducing the space occupied by the connection wire harness 40. Thus, it can also effectively increase the bonding area between the bottoms of multiple battery cells 20 and the heating film 30 or the bottom plate 13, and then improve the installation stability of multiple battery cells 20, thereby reducing the risk of damage to the battery device 100 due to vibration and shock; in addition, it can also reduce the risk of the connection wire harness 40 being squeezed or worn.

[0127] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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 covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body (10), an accommodation space is formed inside the box body (10), and the box body (10) has a bottom plate (13); A structural beam (1), disposed in the accommodation space, and an avoidance space is formed on the structural beam (1); A plurality of battery cells (20), and the plurality of battery cells (20) are arranged in the accommodation space; A heating film (30), the heating film (30) is arranged between the bottom plate (13) and the plurality of battery cells (20); A connection wire harness (40), electrically connecting the heating film (30), and at least part of the connection wire harness (40) is received in the avoidance space.

2. The battery device according to claim 1, characterized in that, The heating film (30) includes a plurality of heating sheets (311), and the plurality of heating sheets (311) are arranged at intervals.

3. The battery device according to claim 2, characterized in that, The connection wire harness (40) includes a first connection wire harness (41), and the first connection wire harness (41) electrically connects two of the heating sheets (311); The structural beam (1) includes a first beam (11), an avoidance groove (111) is formed on the first beam (11), and at least part of the first connection wire harness (41) is received in the avoidance groove (111).

4. The battery device according to claim 2, characterized in that, The heating sheet (311) extends along a first direction, the plurality of battery cells (20) are arranged along the first direction to form a battery cell assembly, the number of the battery cell assemblies is plural, at least one of the heating sheets (311) is arranged at the bottom of each battery cell assembly, and the first direction is the thickness direction of the battery cell (20).

5. The battery device according to claim 4, characterized in that, The plurality of heating sheets (311) correspond to the plurality of battery cell assemblies one by one. In a second direction perpendicular to the first direction, the edge of the battery cell assembly extends beyond the heating sheet (311) provided corresponding thereto.

6. The battery device according to claim 4, wherein, In the first direction, both ends of the heating sheet (311) extend beyond the end edges of both ends of the battery cell assembly.

7. The battery device according to any one of claims 1-6, characterized in that, The connection wire harness (40) includes a second connection wire harness (42), and the second connection wire harness (42) electrically connects the heating film (30); The structural beam (1) includes a second beam (12), the second beam (12) divides the accommodation space into an electrical compartment (102) and an accommodation cavity (101), and the battery cells are disposed in the accommodation cavity (101); The second beam (12) forms an avoidance hole (121) penetrating the second beam (12), and the second connection wire harness (42) extends into the electrical compartment (102) through the avoidance hole (121).

8. The battery device according to any one of claims 1-6, characterized in that, Further comprising: A cooling part (50), the cooling part (50) has a flow channel for passing a heat-conducting medium, and the cooling part (50) and the heating film (30) are located on the same side of the battery cell (20).

9. The battery device according to claim 8, wherein, The heating film (30) is located between the cooling part (50) and the battery cell (20); The heating film (30) includes a plurality of heating sheets (311) arranged at intervals, and part of the cooling part (50) is exposed outside the heating sheets (311).

10. An electrical device, characterized in that, Comprising: The battery device according to any one of claims 1-9.

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