Battery device and electric equipment

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device and electric equipment. The battery device provided by the utility model comprises a battery monomer, a box body and a heating piece, the box body comprises a first plate body and a second plate body which are arranged in a stacked mode in the first direction, the first side, in the first direction, of the first plate body is provided with a containing space used for containing a battery single body, the other side, opposite to the first direction, of the first plate body is provided with the second plate body, and the first plate body is provided with a protruding structure. Part of the battery monomers are attached to the edge beams; the heating piece comprises a plurality of protective layers and a heating circuit which are stacked in the first direction, the heating circuit is clamped between at least two protective layers, orthographic projection is carried out on a projection plane perpendicular to the first direction in the first direction, the heating circuit and the protruding structure are arranged in a staggered mode, and the heating circuit is arranged close to the boundary beam. The size of the heating element is increased or the arrangement density of the heating circuit is increased. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved by improving the heating element.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery device and an electrical appliance. Background Technology

[0002] Temperature has a significant impact on the performance of power batteries. To ensure the safe and efficient operation of power batteries in low-temperature environments, heating structures are typically installed to preheat the batteries at low temperatures. Currently, heating films are widely used in power batteries due to their advantages such as uniform heating, simple structure, and flexible arrangement.

[0003] However, the reliability of the heating film is highly dependent on its adhesion to the battery cells. If there is a gap between the heating film and the battery cells, the heating film is prone to dry burning and its own temperature rises abnormally, which seriously affects the reliability of the power battery. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery device and an electrical appliance to solve the technical problem of the risk of dry burning of the heating element in the relevant battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a battery cell; a housing including a receiving space for accommodating the battery cell, the housing including a first plate and a second plate stacked along a first direction, the first plate having a receiving space on a first side along the first direction, and the second plate having a second plate on the opposite side along the first direction, the first plate having a protruding structure configured to protrude from the first plate toward the second plate and connect to the second plate; and a heating element including multiple protective layers and heating circuits stacked along the first direction, the heating circuits being sandwiched between at least two protective layers and projected orthogonally along the first direction on a projection plane perpendicular to the first direction, the heating circuits being offset from the protruding structure.

[0006] The battery device provided in this application embodiment has a heating element installed inside the housing. In low-temperature environments, the heating element can heat the individual battery cells, maintaining their temperature within a suitable operating range and preventing capacity reduction and decreased charge / discharge efficiency caused by low temperatures. The heating circuitry within the heating element avoids the protruding structures on the first plate, ensuring good support for the area containing the heating circuitry within the heating element and allowing for close contact with the battery cells. This not only ensures that heat is concentrated on the battery area requiring heating, improving heating efficiency, but also prevents the heating circuitry from being suspended above the protruding structures and falling into a dry-burning state. This eliminates the risk of aging, damage, or other problems caused by dry-burning of the heating element, effectively improving the reliability of the battery device. Furthermore, the first and second plates form a double-layer composite structure, capable of withstanding significant pressure or external impacts without easily deforming, thus enhancing the battery device's vibration and impact resistance.

[0007] In some embodiments, the heating element and the protruding structure are offset from each other when projected onto a projection plane perpendicular to the first direction. By adjusting the positional relationship between the protruding structure and the heating element, that is, by making the protruding structure actively avoid the heating element, the suspension and deformation of the heating element caused by lack of support can be reduced, thereby enabling the heating element to better fit the battery cell and further reducing the risk of dry burning of the heating film.

[0008] In some embodiments, the first plate is further provided with a through hole, which is projected onto a projection plane perpendicular to the first direction along the first direction, and the heating circuit is offset from the through hole.

[0009] By adopting the above design, the structural integrity of the heating circuit can be ensured by staggering the heating circuit with the through holes on the first plate, thereby effectively improving the reliability of the heating element and the battery device.

[0010] In some embodiments, the first plate has a plurality of through holes, and the heating element covers at least a portion of the through holes.

[0011] By adopting the above design, on the one hand, by making some through holes actively avoid the heating element, the suspension and deformation of the heating element caused by the lack of support can be reduced, so that the heating element can better fit the battery cell. On the other hand, by making another part of the through holes can be covered by the heating element, the flexibility of the through hole position design can be improved and the design difficulty of the first plate can be reduced.

[0012] In some embodiments, the heating element is laid in a local area of ​​the first plate, and the battery cell is bonded and fixed to the heating element and the first plate.

[0013] The above design can effectively improve the fixation of individual battery cells and enhance the structural stability and vibration resistance of the battery device.

[0014] In some embodiments, the battery cell is bonded to the heating element and the first plate by structural adhesive, with the structural adhesive encapsulating the heating element on the side away from the first plate.

[0015] By adopting the above design, the gap between the heating element and the battery cell can be forcibly eliminated, so that the heat of the heating element can be stably transferred to the battery cell through the adhesive layer, thereby avoiding the dry burning state.

[0016] In some embodiments, the projection is drawn on the projection plane of the first direction along the first direction, the projected area of ​​the heating element is S1, and the sum of the projected areas of all battery cells is S2, where S1 = 0.2S2 ~ 0.5S2.

[0017] The above design ensures the heating effect of the heating element and avoids heating redundancy, saving battery device costs. At the same time, it can also meet the requirements for the fixed strength of the battery cells and the requirements for avoiding irregular structures.

[0018] In some embodiments, a plurality of battery cells are arranged along a second direction and a third direction to form a plurality of battery cell assemblies arranged along the second direction. The battery device includes a plurality of heating elements arranged along the second direction, the heating elements extending along the third direction, and the plurality of heating elements being respectively disposed opposite to the plurality of battery cells; the first direction, the second direction, and the third direction are perpendicular to each other.

[0019] The above design enables independent control of heating in different areas, and the placement of the heating elements allows them to precisely target areas with higher heating demands for individual battery cells, thus achieving more precise and efficient temperature management.

[0020] In some embodiments, along the second direction, the size of the heating element is smaller than the size of the battery cell, and the heating element is disposed opposite to the middle of the battery cell.

[0021] By adopting the above design, heat can be concentrated and conducted to the middle of the battery cell, and then diffused evenly to both sides from the middle of the battery cell, thereby achieving a better heating effect.

[0022] In some embodiments, the irregular structure includes a through hole, a protruding structure near the edge of the battery cell along the second direction, and is offset from the heating element.

[0023] By adopting the above design, the suspension and deformation of the heating element caused by lack of support can be reduced, thereby enabling the heating element to better fit the battery cell and further reducing the risk of dry burning of the heating element.

[0024] In some embodiments, the housing includes side beams, and some battery cells are fitted to the side beams. Near the side beams, the size of the heating element is increased or the density of the heating circuit is increased.

[0025] By adopting the above design, local heating compensation can be achieved, making up for the problems caused by the difference in heat dissipation in different areas, thereby improving the temperature uniformity inside the battery device and further improving the reliability of the battery device.

[0026] An embodiment of the second aspect of this application provides an electrical device including the battery device of the first aspect, the battery device being used to store or provide electrical energy.

[0027] The electrical equipment provided in this application embodiment can effectively improve the reliability of the electrical equipment by adopting the battery device of the first aspect.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 The structural schematic diagram of the vehicle provided in this application embodiment;

[0031] Figure 2 This is an exploded view of the battery device provided in the embodiments of this application;

[0032] Figure 3 This is an exploded view of a single battery cell provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the battery device provided in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the battery device provided in an embodiment of this application from another perspective;

[0035] Figure 6 yes Figure 5 Enlarged view of the structure shown in Figure A;

[0036] Figure 7 This is a partial structural diagram of the connection between the first plate and the second plate provided in the embodiments of this application.

[0037] The markings in the diagram mean:

[0038] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0039] 10. Box body; 11. First plate; 12. Second plate; 111. Protruding structure; 112. Through hole; 13. Side beam;

[0040] 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Electrode assembly; 23a. Tab; 24. Pressure relief mechanism;

[0041] 30. Heating element; 31. Protective layer; 32. Heating circuit. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this 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 art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the 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 used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0050] Temperature has a significant impact on the performance of power batteries. Excessively low ambient temperatures not only drastically reduce battery charging and discharging efficiency and usable capacity, but also accelerate the depletion of active materials within the battery, shortening its lifespan. To ensure the safe and efficient operation of power batteries in low-temperature environments, heating structures are typically installed to preheat them before startup or charging. Currently, heating films are widely used in power batteries due to their advantages such as uniform heating, simple structure, and flexible placement. The heating film is usually directly installed inside the battery casing and adhered to the surface of the individual battery cells. Upon powering on, heat is transferred to the individual cells through thermal conduction, achieving rapid temperature rise.

[0051] However, the heating efficiency and reliability of the heating film are highly dependent on its adhesion to the battery cells, and certain technical defects exist in practical applications. In some power batteries, to meet specific functional requirements, the casing wall used to assemble the heating film is designed with recesses, through holes, and other structures. These structures cannot reliably support the heating film, easily leading to gaps between the heating film and the surface of the battery cells, making it difficult to form a tight fit. When the heating film is energized and heats up, heat cannot be effectively transferred to the battery cells and casing wall at these gaps, causing the heating film to enter a dry-burning state, resulting in an abnormally high temperature. Localized overheating of the heating film not only accelerates material aging and film damage but may also trigger thermal runaway in the power battery, seriously affecting its reliability.

[0052] Based on the above reasons, this application provides a battery device including a battery cell, a housing, and a heating element. The housing includes a first plate and a second plate stacked along a first direction. The first plate has a receiving space for accommodating the battery cell on a first side along the first direction, and the second plate is disposed on the other side of the first plate along the first direction. A protruding structure is provided on the first plate, configured to protrude from the first plate toward the second plate. The heating element includes heating circuitry projected orthographically along the first direction on a projection plane perpendicular to the first direction, with the heating circuitry offset from the protruding structure. In this way, by ensuring that the heating circuitry of the heating element avoids the protruding structure on the first plate, good thermal conductivity between the heating element and the battery cell can be guaranteed, preventing the heating element from becoming dry-burning during use, thereby effectively improving the reliability of the battery device.

[0053] The battery device provided in this application embodiment can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] For ease of explanation, this application uses a vehicle 1000 as an example of an electrical device.

[0055] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

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

[0057] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0059] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed within the housing 10.

[0061] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0062] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0063] As an example, the housing 10 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0064] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly.

[0065] Of course, the box 10 formed by the first box and the second box can be of various shapes, such as a cylinder, a cuboid, etc.

[0066] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0067] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0068] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after being discharged by recharging to activate the active materials.

[0069] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0070] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 20 provided in some embodiments of this application. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0071] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength, so that end cap 21 is not easily deformed under pressure or impact, giving battery cell 20 higher structural strength and improved safety performance. End cap 21 can be provided with functional components such as electrode terminals 21a, which can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism 24 for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component may be provided on the inner side of the end cap 21. The insulating component can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce short-circuit wind direction. For example, the insulating component may be made of plastic, rubber, etc.

[0072] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing 22. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator located between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. A separator is placed between the positive and negative electrodes to prevent short circuits while allowing active ions to pass through.

[0073] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and a separator may be provided between the positive and negative electrode plates. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. The tab 23a connects to the electrode terminal 21a to form a current loop.

[0074] The technical solutions provided in the embodiments of this application will be described below with reference to the accompanying drawings. In the embodiments provided in this application, the X direction is the width direction of the battery device 100, the Y direction is the length direction of the battery device 100, and the Z direction is the height direction of the battery device 100. The X, Y, and Z directions are perpendicular to each other.

[0075] An embodiment of the first aspect of this application provides a battery device 100.

[0076] According to some embodiments of this application, refer to Figures 4-7 , Figure 4 This is a schematic diagram of the structure of the battery device 100 provided in the embodiments of this application. Figure 5 This is a schematic diagram of the battery device 100 provided in an embodiment of this application from another perspective. Figure 6 yes Figure 5 An enlarged view of the structure shown in diagram A. Figure 7 This is a partial cross-sectional view of the first plate 11 and the second plate 12 at the connection position in an embodiment of this application. The battery device 100 provided in this embodiment includes a battery cell 20, a housing 10, and a heating element 30. The housing 10 includes a receiving space for accommodating the battery cell 20. The housing 10 includes a first plate 11 and a second plate 12 stacked along a first direction Z. The first plate 11 has a receiving space on a first side along the first direction Z, and the second plate 12 is disposed on the opposite side along the first direction Z. A protruding structure 111 is disposed on the first plate 11, and the protruding structure 111 is configured to protrude from the first plate 11 toward the second plate 12 and connect to the second plate 12. The heating element 30 includes multiple protective layers 31 stacked along the first direction and heating lines 32. The heating lines 32 are sandwiched between at least two protective layers 31 and projected orthographically along the first direction Z on a projection plane perpendicular to the first direction Z. The heating lines 32 are offset from the protruding structures 111.

[0077] The first plate 11 refers to the plate in the housing 10 used to directly place the battery cells 20; it can be located at the bottom, side, or top of the housing 10, without limitation. The first plate 11 is mainly used to support and fix the battery cells 20, preventing them from shifting or colliding during transportation or use; it also provides a mounting reference surface for the heating element 30. The first plate 11 can have various shapes, such as rectangular, square, or other irregular shapes adapted to the arrangement of the battery cells 20. The first plate 11 has a certain thickness, and in its thickness direction (i.e., the first direction), it has two opposing surfaces, the one facing inwards from the housing 10 being the inner surface, and the one facing outwards from the housing 10 being the outer surface. One or more protruding structures 111 are provided on the first plate 11, and the protruding structures 111 are recessed on the inner surface of the first plate 11. It is understood that, in addition to the protruding structures 111, the inner surface of the first plate 11 has a planar area for supporting the battery cell 20 and the heating element 30. The protruding structures 111 can be processed by injection molding, stamping, etc. The protruding structures 111 can be of various shapes, such as circular, square, rectangular, etc. The first plate 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, magnesium alloy, high-strength engineering plastics, or other robust materials.

[0078] The second plate 12 is a plate arranged parallel to the first plate 11. The second plate 12 is located outside the first plate 11 and can, together with other plates of the housing 10, form a sealed receiving space, or provide protection for the first plate 11. The second plate 12 can be of various shapes, such as rectangular, square, or other irregular shapes adapted to the arrangement of the battery cells 20. The second plate 12 can be a planar structure, or it can also be equipped with positioning holes, receiving grooves, limiting protrusions, etc. The second plate 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, magnesium alloy, high-strength engineering plastics, or other robust materials.

[0079] The first plate 11 and the second plate 12 are connected at the protrusion 111. This connection can be achieved by the bottom of the protrusion 111 directly contacting the surface of the second plate 12 and being connected by welding or bonding. Alternatively, a buffer structure can be filled between the bottom of the protrusion 111 and the surface of the second plate 12, and the connection can be achieved indirectly by bonding. It is understood that various other connection structures can be arranged between the first plate 11 and the second plate 12. Indiscriminately, the second plate 12 can be indirectly connected to other plates of the housing 10 via the first plate 11, or the second plate 12 can be directly connected to other plates of the housing 10, with the first plate 11 mounted on the second plate 12.

[0080] As an example, the first plate 11 and the second plate 12 can together form the bottom plate assembly of the housing 10. The first plate 11 is an inner lining plate located on the inside, used to directly support the battery cell 20 and lay the heating element 30; the second plate 12 is a bottom protective plate located on the outside, used to form a sealed environment to block external impacts, water vapor erosion, etc.

[0081] The battery cell 20 is disposed within the receiving space of the housing 10 and can be placed directly on the first plate 11. Alternatively, the battery cell 20 can be directly fixed to the first plate 11 by structural adhesive or fasteners, or the battery cell 20 can be confined to the first plate 11 by a frame, side beam or other structure.

[0082] The heating element 30 is an electric heating element that converts electrical energy into heat energy when energized, and can directly transfer the heat to the battery cell 20 through thermal conduction, thereby actively heating the battery cell 20. As an example, the heating element 30 can be a heating film, which is thin and flexible, allowing it to fit tightly against the inner surface of the first plate 11 and the surface of the battery cell 20. The protective layer 31 refers to the wrapping material of the heating element 30, mainly used to cover the heating circuit 32, achieving electrical isolation between the heating circuit 32 and the external environment. The protective layer 31 is typically made of materials that are resistant to high temperatures and aging, have high mechanical strength, and good insulation properties, such as polyimide, silicone, epoxy resin, etc. The heating circuit 32 is the core heating element of the heating element 30, typically made of a conductive material with a specific resistance value. When current passes through it, it generates the required heat due to the Joule effect. In this embodiment, the misalignment of the heating line 32 and the protrusion 111 means that the orthographic projection of the heating line 32 on the first plate 11 does not coincide with the protrusion 111. The heating line 32 can have various forms, such as linear or mesh distribution. It is understood that the distribution path of the heating line 32 is opposite to the battery cell 20 and precisely avoids the protrusion 111 on the first plate 11. The heating line 32 can be made of various materials, such as nickel-chromium alloy, copper-nickel alloy, carbon fiber, etc. The heating line 32 is fixed in position and shape by being sandwiched between two protective layers 31. The protective layers 31 can be two, three, four, or more layers; correspondingly, the heating line 32 can be one, two, three, or more layers. The multi-layered structure of the heating element 30 can be connected and fixed by hot pressing or bonding.

[0083] In the battery device 100 provided in this embodiment, a heating element 30 is provided inside the housing 10. In low-temperature environments, the heating element 30 can be used to heat the battery cells 20, keeping the temperature of the battery cells 20 within a suitable operating range and avoiding capacity reduction and charging / discharging efficiency reduction caused by low temperatures. The heating circuit 32 inside the heating element 30 avoids the protrusion structure 111 on the first plate 11. In this way, the area of ​​the heating element 30 containing the heating circuit 32 can be well supported by the first plate 11, thus allowing it to fit tightly against the battery cells 20. This not only ensures that heat is concentrated on the battery area that needs to be heated, improving heating efficiency, but also prevents the heating circuit 32 from being suspended above the protrusion structure 111 and falling into a dry-burning state. This can eliminate the aging, damage, or other hidden dangers of the heating element 30 caused by dry burning, effectively improving the reliability of the battery device 100. In addition, the first plate 11 and the second plate 12 form a double-layer composite structure, which can withstand greater pressure or external impact without easily deforming, helping to improve the vibration and impact resistance of the battery device 100.

[0084] In some embodiments, please refer to Figure 4 and Figure 5 The heating element 30 is orthogonally projected along the first direction Z on a projection plane perpendicular to the first direction Z, and the protruding structure 111 is misaligned.

[0085] In this embodiment, the misalignment of the heating element 30 and the protruding structure 111 means that the orthographic projection of the protective layer 31 of the heating element 30 on the first plate 11 does not coincide with the protruding structure 111.

[0086] As an example, the heating element 30 can be laid on a partial area of ​​the first plate 11, with the protruding structure 111 on the first plate 11 avoiding the heating element 30. The heating element 30 can be laid in various ways; for example, the battery cell 20 can be disposed in a partial area of ​​the first plate 11, while the heating element 30 is laid in all areas of the first plate 11 corresponding to the battery cell 20. Alternatively, the battery cell 20 can be disposed in all or part of the first plate 11, while the heating element 30 is laid in a partial area of ​​the area corresponding to the battery cell 20.

[0087] In the above embodiments, by adjusting the positional relationship between the protruding structure 111 and the heating element 30, that is, by making the protruding structure 111 actively avoid the heating element 30, the suspension and deformation of the heating element 30 due to lack of support can be reduced, thereby enabling the heating element 30 to better fit the battery cell 20 and further reducing the risk of dry burning of the heating element 30.

[0088] In some embodiments, please refer to Figure 5 and Figure 6 The first plate 11 is also provided with a through hole 112, which is projected onto the projection plane perpendicular to the first direction Z along the first direction Z. The heating line 32 is offset from the through hole 112.

[0089] The through-hole 112 extends through the inner and outer surfaces of the first plate 11 along the first direction Z. The through-hole 112 has various uses; for example, it can serve as a channel for the electrophoretic coating liquid to enter and exit the gap between the first plate 11 and the second plate 12, ensuring the normal operation of the electrophoretic coating process. The through-hole 112 can be of various shapes, such as circular, square, or other irregular structures.

[0090] In this embodiment, the misalignment of the heating line 32 and the through hole 112 means that the orthographic projection of the heating line 32 on the first plate 11 does not coincide with the through hole 112.

[0091] In conventional designs, during the manufacturing process, burrs can easily remain at the edges of the through holes on the housing wall. These burrs pose a risk of puncturing the heating element 30, causing insulation failure and affecting the reliability of the heating element 30 and the battery device 100. In the above design, by staggering the heating circuit 32 from the through holes 112 on the first plate 11, the structural integrity of the heating circuit 32 can be ensured, thereby effectively improving the reliability of the heating element 30 and the battery device 100.

[0092] In some embodiments, please refer to Figure 4 and Figure 5 The first plate 11 has multiple through holes 112, and the heating element 30 covers at least part of the through holes 112.

[0093] In this embodiment, the heating element 30 covering the through hole 112 means that the orthographic projection of the protective layer 31 of the heating element 30 on the first plate 11 coincides with the through hole 112. It can be understood that since the heating circuit 32 needs to avoid the through hole 112, the heating element 30 covering the through hole 112 is essentially the protective layer 31 of the heating element 30 covering the through hole 112.

[0094] As an example, the first plate 11 is provided with a plurality of through holes 112, some of which are offset from the heating element 30, and the other part of the through holes 112 are covered by the heating element 30.

[0095] In the above design, on the one hand, by making some of the through holes 112 actively avoid the heating element 30, the suspension and deformation of the heating element 30 due to lack of support can be reduced, so that the heating element 30 can better fit the battery cell 20. On the other hand, by making another part of the through holes 112 can be covered by the heating element 30, the flexibility of the through hole 112 position design can be improved, and the design difficulty of the first plate 11 can be reduced.

[0096] In some embodiments, the heating element 30 is laid on a local area of ​​the first plate 11, and the battery cell 20 is bonded and fixed to the heating element 30 and the first plate 11.

[0097] Specifically, multiple battery cells 20 are disposed in all or part of the first plate 11, and heating elements 30 are laid in the part of the area corresponding to the battery cells 20 in the first plate 11. The battery cells 20 are directly connected to the heating elements 30 and the first plate 11 without heating elements 30 by adhesive.

[0098] Regardless of location, the heating element 30 can be bonded to the first plate 11 using thermally conductive structural adhesive.

[0099] After the battery cell 20 is placed on the first plate 11, its position needs to be fixed to prevent displacement or collision during transportation or use. The battery cell 20 is bonded and fixed to the first plate 11, which not only achieves reliable position fixation, but also helps to simplify the overall structure of the battery device 100 and improve assembly efficiency.

[0100] The heating element 30 is usually laid directly on the first plate 11 or bonded to the first plate 11 by double-sided adhesive. By limiting the laying range of the heating element 30 and reserving an area, the battery cell 20 can be directly bonded to the first plate 11, which can further improve the fixing effect of the battery cell 20 and significantly enhance the structural stability and vibration resistance of the battery device 100.

[0101] In some embodiments, the battery cell 20 is bonded to the heating element 30 and the first plate 11 by structural adhesive, and the structural adhesive encapsulates the heating element 30 on the side away from the first plate 11.

[0102] The structural adhesive encapsulates the heating element 30 on the side away from the first plate 11. That is, the structural adhesive covers the surface and thickness edge of the heating element 30 facing the battery cell 20, forming a wrap-around sealing layer structure.

[0103] In the above design, on the one hand, the structural adhesive filled between the heating element 30 and the battery cell 20 can forcibly eliminate the gap between the heating element 30 and the battery cell 20, so that the heat of the heating element 30 can be stably transferred to the battery cell 20 through the adhesive layer, thereby avoiding the dry burning state. At the same time, this design can also enhance the fixing strength of the battery cell 20 and the structural stability of the battery device 100. On the other hand, the structural adhesive forms an insulating protective layer on the surface of the heating element 30, which can effectively isolate the external environment from physical damage to the heating element 30 and further reduce the risk of leakage or short circuit.

[0104] In some embodiments, the heating element 30 is projected onto a projection plane perpendicular to the first direction Z along the first direction Z. The projected area of ​​the heating element 30 is S1, and the sum of the projected areas of all the battery cells 20 is S2, where S1 = 0.2S2 ~ 0.5S2.

[0105] In this embodiment, the projected area S1 of the heating element 30 refers to the area covered by the orthographic projection of the heating element 30 onto the plane where the first plate 11 is located, and the value of S1 is equivalent to the outline size of the heating element 30; the projected area S2 of all battery cells 20 refers to the area covered by the orthographic projection of multiple battery cells 20 onto the plane where the first plate 11 is located, and the value of S2 is equivalent to the bottom size of multiple battery cells 20.

[0106] The ratio of S1 to S2 can be any value between 0.2 and 0.5, such as 0.2, 0.3, 0.4, 0.5, etc. The magnitude of the ratio of S1 to S2 reflects the projected overlap area between the heating element 30 and the battery cell 20. The magnitude of the ratio of S1 to S2 directly affects the heating efficiency of the heating element 30 and the fixing effect of the battery cell 20. Specifically, the larger the ratio of S1 to S2, the larger the contact area between the heating element 30 and the battery cell 20, the larger the heating range of the heating element 30 and the higher the heating efficiency; the smaller the ratio of S1 to S2, the larger the direct contact area between the battery cell 20 and the first plate 11, and the higher the fixing strength of the battery cell 20.

[0107] In the above design, by reasonably limiting the coverage of the heating element 30, the heating effect can be guaranteed and heating redundancy can be avoided, saving the cost of the battery device 100. At the same time, this design can also take into account the fixed strength requirements of the battery cell 20 and the need to avoid irregular structures.

[0108] In some embodiments, please refer to Figure 4 and Figure 5 Multiple battery cells 20 are arranged along a second direction X and a third direction Y to form multiple battery cell assemblies arranged along the second direction X. The battery device 100 includes multiple heating elements 30 arranged along the second direction X. The multiple heating elements 30 extend along the third direction Y and are respectively disposed opposite to the multiple battery cell assemblies.

[0109] As an example, the housing 10 is rectangular, the second direction X is the width direction of the housing 10, the third direction Y is the length direction of the housing 10, and multiple battery cells 20 are arranged in a multi-row and multi-column array inside the housing 10.

[0110] Temperatures may vary in different areas within the battery pack 100. For example, areas near the edge of the housing 10 dissipate heat quickly and have lower temperatures, while areas near the center of the housing 10 dissipate heat slowly and have higher temperatures. Therefore, different areas of the battery cells 20 may have different heating requirements. By dividing the multiple battery cells 20 into multiple battery cell assemblies and equipping each battery cell assembly with an independent heating element 30, not only can independent heating be controlled, but the placement of the heating elements 30 can also be adjusted to precisely target the areas of the battery cell 20 with higher heating requirements, thereby achieving more precise and efficient temperature management. Furthermore, the design of multiple heating elements 30 allows for individual replacement when some heating elements 30 suffer structural damage, facilitating maintenance.

[0111] In some embodiments, along the second direction X, the size of the heating element 30 is smaller than the size of the battery cell 20, and the heating element 30 is disposed opposite to the middle of the battery cell 20.

[0112] As an example, the battery cell 20 is rectangular, the second direction X is the length direction of the battery cell 20, the third direction Y is the width direction of the battery cell 20, the heating element 30 is a long strip and is arranged along the third direction Y, and the width of the heating element 30 in the second direction X is less than the length of the battery cell 20.

[0113] It should be noted that the battery cell 20 can be of various shapes. The dimension of the battery cell 20 in the second direction X refers to the maximum outer contour dimension of the battery cell 20. For example, for a cuboid battery cell 20, its dimension in the second direction X can be the length of the battery cell 20, and for a cylindrical battery cell 20, its dimension in the second direction X can be the diameter of the battery cell 20.

[0114] The heating element 30 is positioned opposite the center of the battery cell 20, meaning that along the second direction X, the geometric center of the heating element 30 is aligned with the geometric center of the battery cell 20, the heating element 30 covers the vicinity of the center of the battery cell 20, and is symmetrically away from the edge of the battery cell 20.

[0115] On the one hand, the heating element 30 is positioned corresponding to the middle of the battery cell 20, which allows heat to be concentrated and conducted to the middle of the battery cell 20 and then diffused evenly to both sides from the middle of the battery cell 20; on the other hand, the heating element 30 avoids the edge of the battery cell 20, which can provide clearance for irregular structures.

[0116] In some embodiments, please refer to Figure 4 and Figure 5 The protruding structure 111 is close to the edge of the battery cell 20 along the second direction X and is offset from the heating element 30.

[0117] As an example, please refer to Figure 4 and Figure 5 Multiple battery cells 20 are arranged in multiple rows along the second direction X to form multiple battery cell assemblies. A long strip heating element 30 is laid between each battery cell assembly and the first plate 11. The width of the heating element 30 in the second direction X is less than the length of the battery cell 20. The heating element 30 is aligned with the middle of the battery cell 20 and avoids the edge area of ​​the battery cell 20. The inner surface of the first plate 11 is provided with multiple protrusions 111, which are opposite to the edge area of ​​the battery cell 20.

[0118] Understandably, when the protruding structure 111 is positioned close to the edge of the battery cell 20, it can avoid the heating element 30. That is, the position of the protruding structure 111 does not overlap with the heating element 30 in the coverage area of ​​the first plate 11.

[0119] In some cases, the first plate 11 may be the bottom plate of the housing 10 or a component of the bottom plate assembly. The first plate 11 supports the battery cell 20 and provides protection for the battery cell 20. However, in the area where the protruding structure 111 is set, the first plate 11 has a problem of missing support. For the battery cell 20, the structural strength of the bottom end cap near the edge is usually greater than that near the center. Correspondingly, the bottom end cap near the edge has strong impact resistance and relatively low risk of deformation and damage. Based on this, by making the irregular structure opposite to the edge of the battery cell 20, it is beneficial to improve the vibration and impact resistance of the battery device 100.

[0120] In some embodiments, please refer to Figure 4 and Figure 5 The housing 10 includes a side beam 13, and some battery cells 20 are fitted to the side beam 13. Near the side beam 13, the size of the heating element 30 is increased or the density of the heating circuit 32 is increased.

[0121] The side beam 13 includes an end beam arranged around the side of the housing 10 and a support beam arranged laterally or longitudinally inside the housing 10; the side beam 13 is used to improve the overall rigidity of the housing 10, support and limit the battery cell 20, and provide an installation base for other functional components.

[0122] The partial battery cell 20 being attached to the side beam 13 means that the side wall of the battery cell 20 is directly attached to the wall of the side beam 13 or indirectly attached through a structure such as a buffer pad.

[0123] The size of the heating element 30 refers to the expansion of the laying range and the increase of the coverage area of ​​the heating element 30 in the area of ​​the side beam 13. This can be achieved by adjusting the size and shape of the heating element 30. Increasing the size of the heating element 30 can increase the total heat generation of the heating element 30.

[0124] Increasing the density of the heating lines 32 means arranging more heating lines 32 within the same area. This can be achieved by adjusting the laying method and thickness of the heating lines 32. Increasing the density of the heating lines 32 can increase the heating power of the heating element 30.

[0125] Some batteries are fitted close to the side beam 13, allowing heat to be quickly conducted to the external environment of the housing 10 via the side beam 13. Consequently, the heat dissipation rate of the battery cells 20 closer to the side beam 13 is higher than that of the central battery cells 20, resulting in lower temperatures. In this design, by improving the structure of the heating element 30, localized heating compensation can be achieved, mitigating the problems caused by differences in heat dissipation in different areas. This improves the temperature uniformity within the battery device 100 and further enhances its reliability.

[0126] In some embodiments, the first plate 11 and the second plate 12 are spaced apart, and a buffer pad or heat insulation material may be provided in the space between them to further improve the performance of the battery device 100.

[0127] Understandably, a cavity exists between the first plate 11 and the second plate 12, providing a buffer and energy-absorbing space. When the battery device 100 encounters a collision impact, it can absorb the impact energy through the structural deformation of the plates, thereby protecting the internal battery cells 20. The first plate 11 and the second plate 12 form a connection point at the protruding structure 111, which can improve the overall rigidity of the first plate 11 and the second plate 12, further improving the reliability of the housing 10 structure. Providing buffer material or heat insulation material between the first plate 11 and the second plate 12 can correspondingly improve the impact resistance or heat insulation performance of the housing 10.

[0128] In one specific embodiment provided in this application, please refer to the following: Figures 4 to 7 The battery device 100 includes a housing 10, multiple battery cells 20, and multiple heating elements 30. The housing 10 includes a base plate assembly, which comprises a first plate 11 and a second plate 12 stacked along a first direction Z. The first plate 11 is located near the interior of the housing 10, and the second plate 12 is located near the exterior of the housing 10. The first plate 11 has multiple protrusions 111 and multiple through holes 112, wherein the protrusions 111 are formed by the deformation of the plate through indentation. The housing 10 also includes side beams 13. Multiple battery cells 20 are disposed within the housing 10 and placed on the first plate 11; the multiple battery cells 20 are arranged in an array to form multiple battery cell assemblies, with some battery cells 20 positioned close to or directly attached to the side beams 13. Multiple heating elements 30 are laid on the inner surface of the first plate 11 and are respectively arranged corresponding to multiple battery cell assemblies; the heating elements 30 are laid in a local area of ​​the first plate 11, and are arranged opposite to the middle of the battery cell 20. Near the side beam 13, the size of the heating elements 30 is increased and the coverage area is increased; the heating elements 30 have heating lines 32 inside, and the heating lines 32 avoid the protrusion structure 111 and through hole 112 on the first plate 11. Optionally, the protrusion structure 111 can be arranged close to the edge of the battery cell 20 to directly avoid the heating elements 30.

[0129] In summary, the battery device 100 provided in this application solves the problems of capacity reduction and reduced charging and discharging efficiency caused by low temperature by setting a heating element 30 inside the housing 10. Furthermore, by improving the structure of the heating element 30 and the corresponding plate, the heating circuit 32 of the heating element 30 avoids the irregular structure on the assembly plate, which can prevent the heating element 30 from falling into a dry burning state during use and improve the reliability of the battery device 100.

[0130] An embodiment of the second aspect of this application provides an electrical device including the battery device 100 of the first aspect, the battery device 100 being used to store or provide electrical energy.

[0131] The electrical equipment provided in this application embodiment can effectively improve the reliability of the electrical equipment by adopting the battery device 100 of the first aspect.

[0132] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a box body comprising a containing space for containing the battery cell, the box body comprising a first plate body and a second plate body stacked along a first direction, the first plate body being provided with the containing space on a first side along the first direction and being provided with the second plate body on an opposite side along the first direction, the first plate body being provided with a protruding structure configured to protrude from the first plate body toward the second plate body and be connected with the second plate body, the box body further comprising a boundary beam, and part of the battery cell being arranged in abutment with the boundary beam; a heating element comprising a plurality of layers of protective layers and a heating circuit stacked along the first direction, the heating circuit being arranged between at least two layers of the protective layers, and the heating circuit being arranged in a staggered manner with the protruding structure in a projection plane perpendicular to the first direction and projected along the first direction.

2. The battery device of claim 1, wherein The heating element is arranged in a staggered manner with the protruding structure in a projection plane perpendicular to the first direction and projected along the first direction.

3. The battery device of claim 1, wherein The first plate body is further provided with a through hole, and the heating circuit is arranged in a staggered manner with the through hole in a projection plane perpendicular to the first direction and projected along the first direction.

4. The battery device of claim 3, wherein The first plate body is provided with a plurality of through holes, and the heating element covers at least part of the through holes.

5. The battery device of any one of claims 1-4, wherein, The heating element is arranged on a local area of the first plate body, and the battery cell is fixedly bonded with the heating element and the first plate body.

6. The battery device of claim 5, wherein The battery cell is bonded with the heating element and the first plate body by structural adhesive, and the structural adhesive encapsulates the heating element on a side away from the first plate body.

7. The battery device of claim 5, wherein In a projection plane perpendicular to the first direction and projected along the first direction, a projection area of the heating element is S1, and a sum of projection areas of all the battery cells is S2, and S1 = 0.2S2 ~ 0.5S2.

8. The battery device of claim 5, wherein, A plurality of the battery cells are arranged along a second direction and a third direction, and form a plurality of battery cell assemblies arranged along the second direction, the battery device comprising a plurality of the heating elements arranged along the second direction, the heating elements extending along the third direction, and a plurality of the heating elements being arranged in a corresponding manner with a plurality of the battery cells; the first direction, the second direction, and the third direction being perpendicular to each other.

9. The battery device of claim 8, wherein, Along the second direction, a size of the heating element is smaller than a size of the battery cell, and the heating element is arranged in a corresponding manner with a middle part of the battery cell.

10. The battery device of claim 9, wherein, The protruding structure is arranged in a staggered manner with the heating element near an edge of the battery cell along the second direction.

11. An electrical device, characterized by The battery device comprises the battery device according to any one of claims 1-10, and is used for storing or providing electric energy.

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