Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a battery cell assembly, a side plate and an insulating film. The side plate is made of metal, and at least part of the side plate is located on one side of the battery cell assembly along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. At least part of the insulating film is arranged between the side plate and the battery cell assembly. The side plate comprises a first part and a second part connected to each other, the first part is closer to the electrode terminal than the second part, the size of the first part along the first direction is smaller than the size of the second part along the first direction, the insulating film comprises a first film part and a second film part, the first film part is arranged in a stack with the first part, the second film part is arranged in a stack with the second part, and along the first direction, the size of the first film part beyond the first part is greater than the size of the second film part beyond the second part. The technical scheme provided by the application can effectively improve the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device, and the technical solution provided by this application can effectively improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, some embodiments of this application provide a battery device, which includes a battery cell assembly, a side plate, and an insulating film. The battery cell assembly includes a plurality of battery cells arranged along a first direction, and each battery cell has an electrode terminal disposed on one side along a second direction. The side plate is made of metal, and at least a portion of the side plate is located on one side of the battery cell assembly along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other. At least a portion of the insulating film is disposed between the side plate and the battery cell assembly. The side plate includes a first portion and a second portion that are interconnected, with the first portion being closer to the electrode terminal than the second portion, and the dimension of the first portion along the first direction being smaller than the dimension of the second portion along the first direction. The insulating film includes a first film portion and a second film portion, with the first film portion and the first portion stacked together, and the second film portion and the second portion stacked together, with the dimension of the first film portion extending beyond the first portion along the first direction being larger than the dimension of the second film portion extending beyond the second portion.

[0007] The battery device provided by the above solution has an insulating film at least partially disposed between the side plate and the battery cell assembly. This serves to insulate and isolate the side plate and the battery cells, reducing the risk of electrical sparks generated on the surface of the battery device due to the side plate becoming charged, which could lead to thermal runaway of the battery cells. Specifically, the size of the first portion of the side plate closer to the electrode terminals is set smaller than the size of the second portion, and the size of the insulating film extending beyond the first portion is greater than the size extending beyond the second portion. This forms a notch at the end of the side plate along the first direction, which can be covered by the insulating film. This effectively increases the creepage distance between the electrode terminals of the battery cells at the end and the side plate, reducing the risk of the side plate becoming charged, thereby improving the reliability of the battery device.

[0008] According to some embodiments of this application, the first part includes a first surface and a second surface opposite to each other along their thickness direction, and a first side surface connecting the first surface and the second surface, the first side surface facing the electrode terminal, and the first surface, the second surface and the first side surface are all covered by a first film portion.

[0009] In the above scheme, the insulating film covers the first surface, the second surface and the first side of the first part, which can effectively improve the creepage distance between the electrode terminal and the side plate, thereby improving the insulation effect between the battery cell and the side plate, and making the battery device have higher reliability.

[0010] According to some embodiments of this application, the first part has a first end face in a first direction, and the first part further includes a first arc transition surface, which connects the first end face and the first side face.

[0011] In the above scheme, the first end face and the first side face of the first part are connected by a first arc transition surface. On the one hand, this can reduce the risk of the first part interfering with the insulating film, causing the insulating film to break and affecting the insulation effect; on the other hand, the arc transition can reduce the impact of the tip effect on the reliability of the battery device, which is conducive to improving the reliability of the battery device.

[0012] According to some embodiments of this application, both sides of the second part in the thickness direction are covered by an insulating film.

[0013] In the above scheme, the insulating film covers both sides of the second part in the thickness direction, which can help the insulating film to provide insulation and isolation between the sidewalls and the battery cells, thereby making the battery device more reliable.

[0014] According to some embodiments of this application, the second portion has a second end face in a first direction. Along the first direction, the first end face and the second end face are located on the same side of the side plate, and the dimension by which the first membrane portion extends beyond the first end face is greater than the dimension by which the second membrane portion extends beyond the second end face. The second portion also includes a second side face, which connects the first end face and the second end face.

[0015] In the above scheme, the dimension of the insulating film extending beyond the first end face is greater than the dimension of the insulating film extending beyond the second end face, which can improve the creepage distance between the electrode terminal and the side plate, thereby improving the reliability of the battery device.

[0016] According to some embodiments of this application, the side plate further includes a second arc transition surface and a third arc transition surface, the second arc transition surface connecting the first end face and the second side face, and the third arc transition surface connecting the second end face and the second side face.

[0017] In the above scheme, the first end face and the second side face are connected by a second arc transition surface, and the second end face and the second side face are connected by a third arc transition surface. This can effectively reduce the interference of the end of the side plate along the first direction with the insulating film, which may lead to damage to the insulating film and affect the insulation effect. On the other hand, the arc transition can reduce the impact of the tip effect on the reliability of the battery device, which is conducive to improving the reliability of the battery device.

[0018] According to some embodiments of this application, the first portion and the electrode terminal are located on the same side of the battery cell along the second direction, and the second portion is located on the side of the battery cell along the third direction.

[0019] In the above scheme, the first part and the electrode terminal are located on the same side of the battery cell along the second direction, and the second part is located on the side of the battery cell along the third direction. This enables the side plate to limit and constrain the battery cell in the second and third directions, resulting in high structural reliability of the battery device and improving the reliability of the battery device.

[0020] According to some embodiments of this application, the battery device further includes two end plates, with a battery cell assembly located between the two end plates along a first direction, and a side plate connecting the two end plates.

[0021] In the above scheme, the battery cell assembly is located between two end plates, and the side plate connects the two end plates. This allows the two end plates to constrain the battery cell assembly in the first direction, resulting in high structural reliability of the battery device and improving the reliability of the battery device.

[0022] According to some embodiments of this application, the battery device further includes an insulating cover disposed between an end plate and a battery cell adjacent to the end plate along a first direction.

[0023] In the above scheme, by setting an insulating cover between the end plate and the battery cell, the risk of electrical connection between the end plate and the battery cell can be reduced, thereby making the battery device highly reliable.

[0024] According to some embodiments of this application, along a first direction, the insulating film extends beyond the insulating cover to the side opposite to the battery cell.

[0025] In the above scheme, the insulating film extends beyond the insulating cover to the side away from the battery cell, which can help increase the creepage distance between the battery cell and the side plate, thereby improving the reliability of the battery device.

[0026] According to some embodiments of this application, the battery device further includes an insulating plate, the insulating plate and the electrode terminals are located on the same side of the battery cell assembly along the second direction, and the insulating plate is provided with a through hole through which the power supply terminal protrudes.

[0027] In the above scheme, the insulating plate and the electrode terminals are located on the same side of the battery cell assembly along the second direction. The insulating plate is provided with through holes through which the power supply terminals pass through, which can reduce the risk of short circuit between battery cells and make the battery device highly reliable.

[0028] According to some embodiments of this application, the dimension of the insulating plate along the first direction is larger than the dimension of the first portion along the first direction.

[0029] In the above scheme, by setting the dimension of the insulating plate along the first direction to be larger than the dimension of the first part along the first direction, a longer creepage distance can be achieved between the battery cell and the side plate, thereby improving the reliability of the battery device.

[0030] According to some embodiments of this application, along a first direction, the insulating plate is located on the side of the first portion facing away from the battery cell assembly.

[0031] In the above scheme, the insulating plate is set on the side of the first part away from the battery cell assembly, so that there is a longer creepage distance between the battery cell and the side plate, which is conducive to improving the reliability of the battery device.

[0032] According to some embodiments of this application, along a first direction, the insulating film extends beyond both ends of the insulating plate.

[0033] In the above scheme, the insulating film extends beyond both ends of the insulating plate, which can effectively increase the creepage distance between the battery cell and the side plate, thereby improving the reliability of the battery device.

[0034] Secondly, some embodiments of this application also provide an electrical device, including the battery device of any of the first aspects.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application;

[0038] Figure 2 This is an exploded perspective view of the battery pack in some embodiments of this application;

[0039] Figure 3 This is a perspective view of the battery device in some embodiments of this application;

[0040] Figure 4 This is a perspective view of a battery device with an insulating film hidden in some embodiments of this application;

[0041] Figure 5 This is a perspective view of the side plate and insulating film in some embodiments of this application;

[0042] Figure 6 This is a partial structural diagram of the side plate in some embodiments of this application;

[0043] Figure 7 for Figure 3 Enlarged view of point A in the middle;

[0044] Figure 8 for Figure 4 Enlarged view of point B in the middle;

[0045] Figure 9 This is a schematic diagram of the side plate and battery cell in other embodiments of this application.

[0046] Icons: 1000 - Vehicle; 100 - Battery Pack; 200 - Controller; 300 - Motor; 10 - Battery Unit; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 11 - Battery Cell Assembly; 110 - Battery Cell; 111 - Electrode Terminal; 12 - Side Panel; 120 - Flanged Edge; 121 - Panel Body; 122 - Protrusion; 123 - First Section; 1230 - First Surface; 1231 - Second Surface; 1232 - First Side Surface; 1233-First end face; 1234-First arc transition surface; 124-Second part; 1240-Second end face; 1241-Second side face; 1242-Second arc transition surface; 1243-Third arc transition surface; 13-End plate; 130-Outwardly turned part; 14-Insulating film; 140-First film part; 141-Second film part; 15-Insulating plate; 150-Through hole; 17-Insulating cover; x-First direction; z-Second direction; y-Third direction. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0053] In this application, "multiple" means two or more (including two).

[0054] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0055] The battery cell 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 the embodiments of this application are not limited to this.

[0056] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0057] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity.

[0058] In some embodiments, the battery device may be a battery module. Exemplarily, the battery device includes a battery cell assembly, end plates, and side plates, with two end plates located at both ends of the battery cell assembly and two side plates located on both sides of the battery cell assembly and respectively connected to the two end plates.

[0059] A battery cell assembly may include multiple battery cells, which are connected in series, parallel or mixed via a busbar.

[0060] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0061] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing. Alternatively, the battery device may be a battery pack, which includes a housing and one or more battery cells housed within the housing. Alternatively, the battery pack may include a housing and battery modules housed within the housing.

[0062] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0063] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0064] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0065] In some embodiments, the battery device may be an energy storage device, which includes a housing with a door on at least one side. The energy storage device may include an energy storage container, an energy storage cabinet, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0066] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the reliability of the battery device must also be taken into account.

[0067] In related technologies, a battery device includes a battery cell assembly and a side plate. The battery cell assembly includes a plurality of battery cells arranged along a first direction. At least a portion of the side plate is located on one side of the battery cell assembly along a third direction to constrain the battery cell assembly, thereby grouping the battery cells together. The side plate is typically made of metal, and an insulating film is provided between the side plate and the battery cells to balance the constraining force of the side plate on the battery cells and the insulation between the side plate and the battery cells.

[0068] However, with the development of battery technology, the voltage of battery devices is getting higher and higher. The creepage distance between the battery cells and the side plates in the battery devices of related technologies cannot meet the creepage distance requirements of high voltage, which can easily cause the side plates to become charged, generate electric sparks, and cause thermal runaway of the battery cells, affecting the reliability of the battery device.

[0069] In view of this, to improve the creepage distance between the battery cells and the side plate and reduce the problem of the side plate being charged and affecting the reliability of the battery device, some embodiments of this application provide a battery device, which includes a battery cell assembly, a side plate, and an insulating film. The battery cell assembly includes a plurality of battery cells arranged along a first direction, and each battery cell has an electrode terminal disposed on one side along a second direction. The side plate is made of metal, and at least a portion of the side plate is located on one side of the battery cell assembly along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other. At least a portion of the insulating film is disposed between the side plate and the battery cell assembly. The side plate includes a first portion and a second portion that are interconnected, with the first portion being closer to the electrode terminal than the second portion, and the dimension of the first portion along the first direction being smaller than the dimension of the second portion along the first direction. The insulating film includes a first film portion and a second film portion, with the first film portion and the first portion stacked together, and the second film portion and the second portion stacked together, with the dimension of the first film portion extending beyond the first portion along the first direction being larger than the dimension of the second film portion extending beyond the second portion.

[0070] The battery device provided by the above solution has an insulating film at least partially disposed between the side plate and the battery cell assembly. This insulating film serves to isolate the side plate and the battery cells, reducing the risk of the side plate becoming charged, causing electrical sparks on the surface of the battery device, and leading to thermal runaway of the battery cells. Specifically, the size of the first portion of the side plate closer to the electrode terminals is set smaller than the size of the second portion, and the size of the first film portion extending beyond the first portion is greater than the size of the second film portion extending beyond the second portion. This forms a notch at the end of the side plate along the first direction, and this notch can be covered by the insulating film. This effectively increases the creepage distance between the electrode terminals of the battery cells at the end and the side plate, reducing the risk of the side plate becoming charged and improving the reliability of the battery device.

[0071] The battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0072] The technical solutions described in the embodiments of this application are applicable to battery devices, energy storage devices using battery devices, and electrical devices using battery devices.

[0073] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more battery modules and / or battery devices mounted on the cabinet.

[0074] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0075] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0076] Figure 1 This is a schematic diagram of vehicle 1000 in some embodiments of this application.

[0077] The electrical device is a vehicle 1000. Inside the vehicle 1000, a controller 200, a motor 300, and a battery device 10 can be installed. The controller 200 controls the battery device 10 to supply power to the motor 300. For example, the battery device 10 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 10 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0078] Please refer to Figure 2 , Figure 2 This is an exploded perspective view of the battery pack 100 in some embodiments of this application.

[0079] Figure 2 In this battery device, there is a battery pack 100, which includes a housing 20 and individual battery cells 110, with the individual battery cells 110 being housed within the housing 20.

[0080] The housing 20 provides assembly space for the battery cell 110, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 110. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0081] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as cylinder, cuboid or cube.

[0082] In the battery pack 100, there can be one or more battery cells 110 disposed within the housing 20. When there are multiple battery cells 110 disposed within the housing 20, the multiple battery cells 110 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 110 are connected in both series and parallel configurations. The multiple battery cells 110 can be directly connected in series, in parallel, or in a mixed configuration together, and then the entire assembly of the multiple battery cells 110 is housed within the housing 20. For example, the multiple battery cells 110 constitute a battery cell assembly 11 and are housed within the housing 20.

[0083] The battery device 10 includes a battery cell assembly 11, which includes multiple battery cells 110. Each battery cell 110 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 to these. The battery cell 110 can be in the form of a cuboid, cylinder, prism, or other shapes.

[0084] Optionally, the battery pack 100 includes a housing 20 and a battery module, the battery module being housed within the housing 20.

[0085] Some embodiments of this application provide a battery device 10; please refer to [link to relevant documentation]. Figures 3-8 , Figure 3 This is a perspective view of the battery device 10 in some embodiments of this application. Figure 4 This is a perspective view of the battery device 10 with the insulating film 14 hidden in some embodiments of this application. Figure 5 This is a perspective view of the side plate 12 and the insulating film 14 in some embodiments of this application. Figure 6 This is a partial structural diagram of the side plate 12 in some embodiments of this application. Figure 7 for Figure 3 Enlarged view of point A in the middle. Figure 8 for Figure 4 Enlarged view of point B in the middle.

[0086] The battery device 10 includes a battery cell assembly 11, a side plate 12, and an insulating film 14. The battery cell assembly 11 includes a plurality of battery cells 110 arranged along a first direction x, and each battery cell 110 has an electrode terminal 111 disposed on one side along a second direction z. The side plate 12 is made of metal, and at least a portion of the side plate 12 is located on one side of the battery cell assembly 11 along a third direction y, wherein the first direction x, the second direction z, and the third direction y are mutually perpendicular. At least a portion of the insulating film 14 is disposed between the side plate 12 and the battery cell assembly 11. The side plate 12 includes a first part 123 and a second part 124 that are connected to each other. The first part 123 is closer to the electrode terminal 111 than the second part 124. The size of the first part 123 along the first direction x is smaller than the size of the second part 124 along the first direction x. The insulating film 14 includes a first film portion 140 and a second film portion 141. The first film portion 140 is stacked with the first part 123, and the second film portion 141 is stacked with the second part 124. Along the first direction x, the size of the first film portion 140 extending beyond the first part 123 is larger than the size of the second film portion 141 extending beyond the second part 124.

[0087] Optionally, the battery device 10 in some embodiments of this application may be a battery module.

[0088] The battery cell assembly 11 includes a plurality of battery cells 110 arranged along a first direction x. The battery cells 110 may be cuboids, prisms, or other shapes. Exemplarily, in some embodiments of this application, the battery cells 110 may be cuboids, and the plurality of battery cells 110 are stacked along the first direction x, with the surfaces of the two adjacent battery cells 110 having the largest area touching each other.

[0089] In some embodiments, the battery cell 110 is provided with electrode terminals 111, which are used for outputting or inputting electrical energy. The electrode terminals 111 are located on one side of the battery cell 110 along the second direction z. The first direction x and the second direction z are perpendicular to each other.

[0090] For example, the battery cell 110 includes a housing, an electrode assembly, and an electrode terminal 111. The electrode assembly is disposed inside the housing, and the electrode terminal 111 is disposed on the wall of the housing along the second direction z and is electrically connected to the electrode assembly.

[0091] Optionally, the battery device 10 also includes an insulating plate 15. Along the second direction z, the insulating plate 15 is disposed on the same side as the electrode terminals 111. A current-combining member is disposed on the insulating plate 15. The current-combining member electrically connects the electrode terminals 111 of two adjacent battery cells 110 so that the battery cells 110 in the battery cell assembly 11 are electrically connected.

[0092] The side plate 12 is a structural member disposed on the side of the battery cell assembly 11 along the third direction y. In some embodiments, the battery device 10 includes an end plate 13 and a side plate 12. There are two end plates 13 and two side plates 12. The two end plates 13 are respectively disposed on both sides of the battery cell assembly 11 along the first direction x, and the two side plates 12 are respectively disposed on both sides of the battery cell assembly 11 along the third direction y. The two ends of the side plates 12 along the first direction x are respectively connected to the two end plates 13, so that the end plates 13 and the side plates 12 together bind the battery cell assembly 11.

[0093] Side panel 12 is made of metal, including but not limited to copper, copper alloy, aluminum, aluminum alloy, steel or other metal materials.

[0094] An insulating film 14 is at least partially disposed in the insulating structure between the side plate 12 and the battery cell 110. The insulating film 14 is made of an insulating material, and exemplaryly, the material of the insulating film 14 includes, but is not limited to, polyethylene, polypropylene, alumina, silicon dioxide, poly(p-phenylene terephthalamide), polyethylene terephthalate, or polyimide.

[0095] Optionally, a portion of the insulating film 14 can cover the side of the side plate 12 facing the battery cell 110, that is, a portion of the insulating film 14 can cover the inner side of the side plate 12 facing the battery cell 110, and another portion of the insulating film 14 can be folded from the inner side of the side plate 12 to the outer side of the side plate 12.

[0096] Please combine Figure 4 , Figure 6 and Figure 8 The side plate 12 includes a first portion 123 and a second portion 124 that are connected to each other. The first portion 123 is closer to the electrode terminal 111 than the second portion 124. For example, taking the electrode terminal 111 as being located at the upper end of the housing, the first portion 123 is above the second portion 124 so that it is closer to the electrode terminal 111 than the second portion 124.

[0097] For example, the side panel 12 includes a panel body 121 and a flange portion 120 disposed at one end of the panel body 121 along a second direction z. Optionally, the first portion 123 may be the flange portion 120, and the second portion 124 may be at least a portion of the panel body 121. Optionally, the first portion 123 may be a part of the flange portion 120, and the second portion 124 may be another part of the flange portion 120 and at least a portion of the panel body 121. Optionally, the first portion 123 may be a part of the flange portion 120 and the panel body 121, and the second portion 124 may be a partial or remaining part of the panel body 121.

[0098] Optionally, with Figure 8For example, the first part 123 may include a flange 120, and the second part 124 may include a portion of the plate body 121. The second part 124 is disposed on one side of the battery cell 110 along the third direction y.

[0099] Optionally, with Figure 9 For example, Figure 9 This is a schematic diagram of the side plate 12 and the battery cell 110 in other embodiments of this application. Figure 9 In the first part 123, it can be a part of the flange 120, and the second part 124 includes another part of the flange 120 plus part or all of the plate body.

[0100] "The dimension of the first part 123 along the first direction x is smaller than the dimension of the second part 124 along the first direction x" can be understood as the length of the first part 123 being less than the length of the second part 124; or, a gap is formed between the first part 123 and the second part 124, which exposes a portion of the casing of the battery cell 110 at the end of the battery cell assembly 11.

[0101] The insulating film 14 includes a first film portion 140, which is stacked with a first portion 123. Optionally, the first film portion 140 may be stacked with the inner side of the first portion 123. Optionally, the first film portion 140 may be stacked with both the inner and outer sides of the first portion 123. Optionally, the first film portion 140 may cover the inner and outer sides of the first portion 123, as well as the end of the first portion 123 that faces away from the second portion 124.

[0102] The insulating film 14 includes a second film portion 141, which is stacked with a second portion 124. Optionally, a first film portion 140 may be stacked with the inner side of the second portion 124. Optionally, the first film portion 140 may be stacked with both the inner and outer sides of the second portion 124.

[0103] In some embodiments, the dimension of the first membrane portion 140 along the first direction x may be equal to the dimension of the second membrane portion 141 along the first direction x.

[0104] In other embodiments, the dimension of the first membrane portion 140 along the first direction x may be greater than the dimension of the second membrane portion 141 along the first direction x.

[0105] In other embodiments, the dimension of the first membrane portion 140 along the first direction x may be smaller than the dimension of the second membrane portion 141 along the first direction x.

[0106] In some embodiments, the dimension of the first membrane portion 140 along the first direction x may be larger than the dimension of the first portion 123 along the first direction x, and extend beyond both ends of the first portion 123. The dimension of the second membrane portion 141 along the first direction x may be larger than the dimension of the second portion 124 along the first direction x, and extend beyond both ends of the second portion 124. Specifically, the dimension of the first membrane portion 140 extending beyond the first portion 123 is greater than the dimension of the second membrane portion 141 extending beyond the second portion 124.

[0107] Optionally, the insulating film 14 may be rectangular, and may cover the inner side of the side plate 12, with some portions turned outwards to cover all or part of the outer side of the side plate 12. For example, the outwardly turned portion of the insulating film 14 may cover the outer side of the first portion 123 and the outer side of the second portion 124.

[0108] The battery device 10 provided by the above solution has at least a portion of the insulating film 14 disposed between the side plate 12 and the battery cell assembly 110. This serves to insulate and isolate the side plate 12 and the battery cell 110, reducing the risk of electrical sparks generated on the surface of the battery device 10 due to the side plate 12 being charged, which could lead to thermal runaway of the battery cell 110. Specifically, the size of the first portion 123 of the side plate 12 closer to the electrode terminal 111 is set smaller than the size of the second portion 124, and the size of the insulating film 14 extending beyond the first portion 123 is greater than the size of the insulating film 14 extending beyond the second portion 124. This forms a notch at the end of the side plate 12 along the first direction x, and this notch can be covered by the insulating film 14. This effectively increases the creepage distance between the electrode terminal 111 of the battery cell 110 at the end and the side plate 12, reducing the risk of the side plate 12 becoming charged and improving the reliability of the battery device 10.

[0109] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The first part 123 includes a first surface 1230 and a second surface 1231 opposite to each other along its thickness direction, and a first side surface 1232 connecting the first surface 1230 and the second surface 1231. The first side surface 1232 faces the electrode terminal 111. The first surface 1230, the second surface 1231 and the first side surface 1232 are all covered by the first film portion 140.

[0110] In some embodiments, taking the flanged portion 120 of the side plate 12 as an example, the first surface 1230 can be the surface facing the outer shell of the battery cell 110, that is, the inner side surface of the side plate 12, the second surface 1231 can be the surface away from the outer shell of the battery cell 110, that is, the outer side surface of the side plate 12, and the first side surface 1232 can be the surface facing the electrode terminal 111, that is, the first side surface 1232 is the surface of the first portion 123 along the third direction y.

[0111] In some embodiments, the first film portion 140 completely covers the first surface 1230, the second surface 1231, and the first side surface 1232, that is, the insulating film 14 completely covers the first surface 1230, the second surface 1231, and the first side surface 1232.

[0112] In the above scheme, the insulating film 14 covers the first surface 1230, the second surface 1231 and the first side surface 1232 of the first part 123, which can effectively improve the creepage distance between the electrode terminal 111 and the side plate 12, thereby improving the insulation effect between the battery cell 110 and the side plate 12, and making the battery device 10 have high reliability.

[0113] Alternatively, in some other embodiments, the insulating film 14 may not cover the second surface 1231 and / or the first side surface 1232.

[0114] According to some embodiments of this application, please refer to Figure 6 The first part 123 has a first end face 1233 in the first direction x, and the first part 123 also includes a first arc transition surface 1234, which connects the first end face 1233 and the first side face 1232.

[0115] In some embodiments, the first portion 123 has a first end face 1233 in the first direction x, and the first end face 1233 may be disposed toward the side where the end plate 13 is located. The first end face 1233 and the first side face 1232 are connected by a first arc transition surface 1234 so that there is an arc transition between the first end face 1233 and the first side face 1232.

[0116] In the above scheme, the first end face 1233 of the first part 123 and the first side face 1232 are connected by the first arc transition surface 1234. On the one hand, this can reduce the risk of the first part 123 interfering with the insulating film 14 and causing the insulating film 14 to break, thus affecting the insulation effect. On the other hand, the arc transition can reduce the impact of the tip effect on the reliability of the battery device 10, which is conducive to improving the reliability of the battery device 10.

[0117] Alternatively, in some other embodiments, the first end face 1233 and the first side face 1232 can be directly connected.

[0118] According to some embodiments of this application, both sides of the second portion 124 in the thickness direction are covered by an insulating film 14.

[0119] In some embodiments, a portion of the insulating film 14 is disposed on the inner side of the side plate 12, and another portion is folded outward and can cover the outer side of the first portion 123 and the second portion 124.

[0120] Optionally, the upright plate also includes a third part, which is connected to the first part 123 via the second part 124. The maximum dimension of the third part along the first direction x is greater than the dimension of the second part 124 along the first direction x. The portion of the third part that extends beyond the second part 124 can be connected to the end plate 13. The outer surface of the third part may not be covered by the insulating film 14.

[0121] In the above scheme, the insulating film 14 covers both sides of the second part 124 in the thickness direction, which can help the insulating film 14 to provide insulation and isolation between the side wall and the battery cell 110, thereby making the battery device 10 have high reliability.

[0122] According to some embodiments of this application, please refer to Figure 6 The second portion 124 has a second end face 1240 in the first direction x. Along the first direction x, the first end face 1233 and the second end face 1240 are located on the same side of the side plate 12. The dimension of the first membrane portion 140 extending beyond the first end face 1233 is greater than the dimension of the second membrane portion 141 extending beyond the second end face 1240. The second portion 124 also includes a second side face 1241, which connects the first end face 1233 and the second end face 1240.

[0123] In some embodiments, the second portion 124 has a second end face 1240 in the first direction x, and the second end face 1240 may face the side where the end plate 13 is located.

[0124] In some embodiments, along the first direction x, the first membrane portion 140 extends beyond the first end face 1233, and the second membrane portion 141 extends beyond the second end face 1240. This can be understood as the insulating film 14 extending beyond both the first end face 1233 and the second end face 1240 along the first direction x, and the dimension by which the insulating film 14 extends beyond the first end face 1233 is greater than the dimension by which it extends beyond the second end face 1240. This can also be understood as the first end face 1233 being further away from the side where the end plate 13 is located compared to the second end face 1240.

[0125] Along the second direction z, the second part 124 also includes a second side surface 1241, which connects the first end surface 1233 and the second end surface 1240.

[0126] In some embodiments, the second side surface 1241 can be a flat surface, and the plane containing the second side surface 1241 can be perpendicular to the second direction z. In other embodiments, the second side surface 1241 can be an arc surface, with one end of the arc surface connected to the first end surface 1233 and the other end connected to the second end surface 1240.

[0127] In the above scheme, the dimension of the insulating film 14 extending beyond the first end face 1233 is greater than the dimension of the insulating film 14 extending beyond the second end face 1240, which can improve the creepage distance between the electrode terminal 111 and the side plate 12, thereby improving the reliability of the battery device 10.

[0128] According to some embodiments of this application, please refer to Figure 6 The side plate 12 also includes a second arc transition surface 1242 and a third arc transition surface 1243. The second arc transition surface 1242 connects the first end face 1233 and the second side face 1241, and the third arc transition surface 1243 connects the second end face 1240 and the second side face 1241.

[0129] In some embodiments, the first end face 1233 is connected to the second side face 1241 through the second arc transition surface 1242, and the second end face 1240 is connected to the second side face 1241 through the third arc transition surface 1243.

[0130] For example, the second arc transition surface 1242 is a rounded corner between the first end face 1233 and the second side face 1241. The third arc transition surface 1243 is a rounded corner between the second end face 1240 and the second side face 1241.

[0131] In the above scheme, the first end face 1233 and the second side face 1241 are connected by the second arc transition surface 1242, and the second end face 1240 and the second side face 1241 are connected by the third arc transition surface 1243. This can effectively reduce the interference of the end of the side plate 12 along the first direction x with the insulating film 14, which may lead to damage to the insulating film 14 and affect the insulation effect. On the other hand, the arc transition can reduce the impact of the tip effect on the reliability of the battery device 10, which is conducive to improving the reliability of the battery device 10.

[0132] According to some embodiments of this application, the first portion 123 and the electrode terminal 111 are located on the same side of the battery cell 110 along the second direction z, and the second portion 124 is located on the side of the battery cell 110 along the third direction y.

[0133] In some embodiments, the side plate 12 includes a flange 120 and a plate body 121. The flange 120 and the electrode terminal 111 are located on the same side of the battery cell 110 along the second direction z, and the plate body 121 is located on the side of the battery cell 110 along the third direction y.

[0134] In some embodiments, the first portion 123 is a flange portion 120, and the second portion 124 can be all or part of the plate body 121. In other words, the end of the flange portion 120 along the first direction x is cut off to form a notch, such that the maximum size of the flange portion 120 along the first direction x is smaller than the maximum size of the plate body 121 along the first direction x.

[0135] In some embodiments, a notch is formed by cutting off the end of the flange 120 along the first direction x and a portion of the end of the plate body 121 along the first direction x, thereby forming a first portion 123 with a smaller dimension along the first direction x and a second portion 124 with a larger dimension along the first direction x.

[0136] In the above scheme, the first part 123 and the electrode terminal 111 are located on the same side of the battery cell 110 along the second direction z, and the second part 124 is located on the side of the battery cell 110 along the third direction y. This enables the side plate 12 to limit and constrain the battery cell 110 in the second direction z and the third direction y, thereby making the battery device 10 structurally reliable.

[0137] Alternatively, in some other embodiments, the arrangement of cutting off the end of the flange 120 along the first direction x to form a notch, such that the flange 120 forms a first portion 123 with a smaller dimension along the first direction x.

[0138] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The battery device 10 also includes two end plates 13. Along the first direction x, the battery cell assembly 11 is located between the two end plates 13, and the side plate 12 connects the two end plates 13.

[0139] In some embodiments, the battery module further includes two end plates 13 along a first direction x, the two end plates 13 being located on both sides of the battery cell assembly 11, and the two ends of the side plate 12 along the first direction x being respectively connected to the two end plates 13.

[0140] Optionally, please see Figure 3 and Figure 4 The end plate 13 has outwardly turned portions 130 on both sides along the third direction y, and the side plate 12 has protrusions 122 on both sides along the first direction x. Along the third direction y, the protrusions 122 and the outwardly turned portions 130 are attached to and connected to each other. The connection relationship between the outwardly turned portions 130 and the protrusions 122 is diverse, including but not limited to bonding, welding, threaded connection, etc.

[0141] In the above scheme, the battery cell assembly 11 is located between two end plates 13, and the side plate 12 connects the two end plates 13, which enables the two end plates 13 to constrain the battery cell assembly 11 in the first direction x, so that the battery device 10 has high structural reliability.

[0142] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The battery device 10 also includes an insulating cover 17 disposed between the end plate 13 and the battery cell 110 adjacent to the end plate 13 along the first direction x.

[0143] In some embodiments, an insulating cover 17 is further provided between the end plate 13 and the battery cell 110. The insulating cover 17 may be provided on the side of the battery cell 110 facing the end plate 13, and on the side of the battery cell 110 where the electrode terminals 111 are provided.

[0144] In the above scheme, by setting an insulating cover 17 between the end plate 13 and the battery cell 110, the risk of electrical connection between the end plate 13 and the battery cell 110 can be reduced, thereby making the battery device 10 highly reliable.

[0145] According to some embodiments of this application, please refer to Figure 7 Along the first direction x, the insulating film 14 extends beyond the insulating cover 17 to the side opposite to the battery cell 110.

[0146] In some embodiments, along the second direction z, the insulating film 14 is disposed on the side of the insulating cover 17 away from the battery cell 110, and along the first direction x, the insulating film 14 extends beyond the side of the insulating cover 17 away from the battery cell 110.

[0147] In the above scheme, the insulating film 14 extends beyond the side of the insulating cover 17 away from the battery cell 110, which can help increase the creepage distance between the battery cell 110 and the side plate 12, thereby improving the reliability of the battery device 10.

[0148] According to some embodiments of this application, please refer to Figure 3 , Figure 4 and Figure 7 The battery device 10 also includes an insulating plate 15, which and the electrode terminal 111 are located on the same side of the battery cell assembly 11 along the second direction z. The insulating plate 15 is provided with a through hole 150 through which the power supply terminal 111 passes.

[0149] In some embodiments, the battery device 10 further includes an insulating plate 15, which is made of an insulating material. Optionally, the insulating plate 15 may be a wiring harness separator for the battery device 10.

[0150] In some embodiments, the insulating plate 15 is provided with through holes 150 through which electrode terminals 111 protrude or are exposed, and the insulating plate 15 may be provided with a busbar component for electrically connecting the electrode terminals 111 of two adjacent battery cells 110.

[0151] In some embodiments, a sampling element may be provided on the insulating plate 15. The sampling element may be connected to the battery cell 110 to collect information such as voltage, current or temperature of the battery cell 110.

[0152] In the above scheme, the insulating plate 15 and the electrode terminal 111 are located on the same side of the battery cell assembly 11 along the second direction z. The insulating plate 15 is provided with a through hole 150 through which the power supply terminal 111 passes, which can reduce the risk of short circuit between battery cells 110 and make the battery device 10 have high reliability.

[0153] According to some embodiments of this application, please refer to Figure 8 The dimension of the insulating plate 15 along the first direction x is greater than the dimension of the first part 123 along the first direction x.

[0154] In some embodiments, the dimension of the insulating member along the first direction x is greater than the dimension of the first portion 123 along the first direction x, that is, along the first direction x, the insulating member extends beyond both ends of the first portion 123 along the first direction x.

[0155] In the above scheme, by setting the size of the insulating plate 15 along the first direction x to be larger than the size of the first part 123 along the first direction x, a longer creepage distance can be achieved between the battery cell 110 and the side plate 12, thereby improving the reliability of the battery device 10.

[0156] According to some embodiments of this application, please refer to Figure 8 Along the first direction x, the insulating plate 15 is located on the side of the first part 123 opposite to the battery cell assembly 11.

[0157] In some embodiments, the insulating plate 15 is located on the side of the first portion 123 facing away from the battery cell assembly 11. Optionally, the insulating plate 15 overlaps the outer side of the first portion 123, for example, the insulating plate 15 overlaps the second surface 1231 of the first portion 123.

[0158] Optionally, the insulating plate 15 overlaps the wall portion of the battery cell 110 where the electrode terminals 111 are provided, and the edge of the insulating plate 15 protrudes to overlap the outer side of the first portion 123.

[0159] In the above scheme, the insulating plate 15 is disposed on the side of the first part 123 away from the battery cell assembly 11, so that there is a longer creepage distance between the battery cell 110 and the side plate 12, which is conducive to improving the reliability of the battery device 10, and thus conducive to improving the reliability of the battery device 10.

[0160] In some other embodiments, the insulating plate 15 and the first portion 123 may be respectively overlapped on one side of the battery cell assembly 11 along the second direction z.

[0161] According to some embodiments of this application, along the first direction x, the insulating film 14 extends beyond both ends of the insulating plate 15.

[0162] In some embodiments, the dimension of the insulating film 14 along the first direction x is larger than the dimension of the insulating plate 15 along the first direction x, and the insulating film 14 extends beyond both ends of the insulating plate 15 along the first direction x.

[0163] Optionally, the insulating plate 15 overlaps the first part 123, the insulating film 14 is disposed on the inner side of the side plate 12 and turned outward to the outer side of the first part 123, the insulating film 14 is disposed between the insulating plate 15 and the first part 123, and the insulating film 14 extends beyond both ends of the insulating plate 15 along the first direction x.

[0164] In the above scheme, the insulating film 14 extends beyond both ends of the insulating plate 15, which can effectively increase the creepage distance between the battery cell 110 and the side plate 12, thereby improving the reliability of the battery device 10.

[0165] Please see Figure 2 Some embodiments of this application also provide a battery pack 100.

[0166] The battery pack 100 includes a housing 20 and the battery assembly 10 described above, the battery assembly 10 being housed within the housing 20. The battery assembly can be the battery pack 100 and / or a battery module.

[0167] In the battery device 10, there can be one or more battery devices 10 disposed within the housing 20. When there are multiple battery devices 10 disposed within the housing 20, the multiple battery devices 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple battery devices 10 are connected in both series and parallel. The multiple battery devices 10 can be directly connected in series, in parallel, or in a mixed manner together, and then the whole assembly of the multiple battery devices 10 is housed within the housing 20.

[0168] Please see Figure 1 Some embodiments of this application also provide an electrical device, including the battery device 10 provided above, and / or the battery device 10.

[0169] The electrical device can be a vehicle 1000, and the vehicle 1000 can include a battery device 10.

[0170] The battery device 10 can be a battery pack 100 and / or a battery module.

[0171] The battery device 10 can be used to power the vehicle 1000. For example, the battery device 10 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 10 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.

[0172] Some embodiments of this application provide a battery device 10; please refer to [link to relevant documentation]. Figures 3-8 The battery device 10 includes a battery cell assembly 11, an end plate 13, a side plate 12, an insulating film 14, and an insulating plate 15.

[0173] The battery cell assembly 11 includes a plurality of battery cells 110 arranged along a first direction x, with the large surface of each battery cell 110 facing the first direction x. The electrode terminals 111 of the battery cells 110 are oriented towards a second direction z, as illustrated by the example where the electrode terminals 111 are located on the top wall of the casing of the battery cell 110.

[0174] There are two end plates 13 and two side plates 12. The two end plates 13 are located on both sides of the battery cell assembly 11 along the first direction x, and the two side plates 12 are located on both sides of the battery cell assembly 11 along the third direction y. Both sides of the end plates 13 along the third direction y are provided with outwardly turned portions 130, and both sides of the side plates 12 along the first direction x are provided with protrusions 122. Along the third direction y, the protrusions 122 and the outwardly turned portions 130 are attached to each other and connected to each other.

[0175] When unfolded, the insulating film 14 is rectangular. A portion of the insulating film 14 covers the inner side surface of the side plate 12, and another portion is folded outward toward the side plate 12 to cover a portion of the outer side surface of the side plate 12, such as covering the outer side surface of the upper end and the outer side surface of the lower end of the side plate 12.

[0176] The side panel 12 includes a flange 120 and a panel body 121. A protrusion 122 is disposed on the panel body 121, and the flange 120 is disposed at the upper end of the panel body 121 and overlaps the top wall of the outer casing of the battery cell 110. The flange 120 is covered by an insulating film 14.

[0177] A portion of the flanged portion 120 along the first direction x and a portion of the plate body 121 along the first direction x are partially cut off, so that the side plate 12 forms a smaller first portion 123 and a larger second portion 124. Both the first portion 123 and the second portion 124 are covered by an insulating film 14.

[0178] Optionally, the first portion 123 has a first surface 1230 and a second surface 1231 opposite to each other in the thickness direction. The first surface 1230 and the second surface 1231 are connected by a first side surface 1232. The first surface 1230, the second surface 1231, and the first side surface 1232 are all covered by an insulating film 14. The first surface 1230 overlaps the top wall, and the second surface 1231 supports an insulating plate 15. A current-combining member is provided on the insulating plate 15 for electrically connecting two adjacent battery cells 110.

[0179] Optionally, the first portion 123 has a first end face 1233 on the side facing the end plate 13 in the first direction x, and the first end face 1233 is connected to the first side face 1232 via a first arc transition surface 1234. The second portion 124 has a second end face 1240 on the side facing the end plate 13 in the first direction x, and the second end face 1240 is connected to the first end face 1233 via a second side face 1241. The first end face 1233 and the second side face 1241 are connected via a second arc transition surface 1242, and the second end face 1240 and the second side face 1241 are connected via a third arc transition surface 1243. Along the first direction x, the insulating film 14 extends beyond the first end face 1233 and the second end face 1240, respectively, and the dimension extending beyond the first end face 1233 is greater than the dimension extending beyond the second end face 1240.

[0180] Optionally, along the first direction x, the size of the insulating plate 15 is larger than the size of the first portion 123, the size of the insulating film 14 is larger than the size of the insulating plate 15, and the insulating film 14 extends beyond both ends of the insulating plate 15 along the first direction x.

[0181] Creepage distance is the shortest path between two conductive parts or between a conductive part and a protective interface of a device, measured along an insulating surface. For example, taking a battery cell 110 at the end as an example, the creepage distance between the electrode terminal 111 of the battery cell 110 at the end and the side plate 12 is calculated along the surface of the insulating plate 15 and the insulating film 14.

[0182] The battery device 10 provided by the above solution has at least a portion of the insulating film 14 disposed between the side plate 12 and the battery cell assembly 110. This insulatingly isolates the side plate 12 and the battery cell 110, reducing the risk of electrical sparks generated on the surface of the battery device 10 due to the side plate 12 being charged, which could lead to thermal runaway of the battery cell 110. Specifically, the size of the first portion 123 of the side plate 12 closer to the electrode terminal 111 is set smaller than the size of the second portion 124, and the size of the insulating film 14 extending beyond the first portion 123 is greater than the size extending beyond the second portion 124. This forms a notch at the end of the side plate 12 along the first direction x, which can be covered by the insulating film 14. This effectively increases the creepage distance between the electrode terminal 111 of the battery cell 110 at the end and the side plate 12, reducing the risk of the side plate 12 becoming charged, thereby improving the reliability of the battery device 10.

[0183] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a plurality of battery cells arranged along a first direction, and each battery cell has an electrode terminal on one side along a second direction. The side plate is made of metal, and at least a portion of the side plate is located on one side of the battery cell assembly along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; An insulating film, at least a portion of which is disposed between the side plate and the battery cell assembly; The side plate includes a first part and a second part that are connected to each other. The first part is closer to the electrode terminal than the second part. The dimension of the first part along the first direction is smaller than the dimension of the second part along the first direction. The insulating film includes a first film portion and a second film portion. The first film portion is stacked with the first part, and the second film portion is stacked with the second part. Along the first direction, the dimension of the first film portion extending beyond the first part is larger than the dimension of the second film portion extending beyond the second part.

2. The battery device according to claim 1, characterized in that, The first portion includes a first surface and a second surface opposite to each other along its thickness direction, and a first side surface connecting the first surface and the second surface, the first side surface facing the electrode terminal, and the first surface, the second surface and the first side surface are all covered by the first film portion.

3. The battery device according to claim 2, characterized in that, The first portion has a first end face in the first direction, and the first portion further includes a first arc transition surface, the first arc transition surface connecting the first end face and the first side face.

4. The battery device according to claim 3, characterized in that, The second part is covered by the insulating film on both sides in the thickness direction.

5. The battery device according to claim 3, characterized in that, The second portion has a second end face in the first direction. Along the first direction, the first end face and the second end face are located on the same side of the side plate. The dimension of the first membrane portion extending beyond the first end face is greater than the dimension of the second membrane portion extending beyond the second end face. The second part also includes a second side surface, which connects the first end surface and the second end surface.

6. The battery device according to claim 5, characterized in that, The side plate also includes a second arc transition surface and a third arc transition surface. The second arc transition surface connects the first end face and the second side face, and the third arc transition surface connects the second end face and the second side face.

7. The battery device according to any one of claims 1-6, characterized in that, The first portion and the electrode terminal are located on the same side of the battery cell along the second direction, and the second portion is located on the side of the battery cell along the third direction.

8. The battery device according to claim 1, characterized in that, The battery device further includes two end plates, and along the first direction, the battery cell assembly is located between the two end plates, and the side plate connects the two end plates.

9. The battery device according to claim 8, characterized in that, The battery device further includes an insulating cover disposed between the end plate and the battery cell adjacent to the end plate along the first direction.

10. The battery device according to claim 9, characterized in that, Along the first direction, the insulating film extends beyond the insulating cover to the side opposite to the battery cell.

11. The battery device according to claim 1, characterized in that, The battery device further includes an insulating plate, the insulating plate and the electrode terminals are located on the same side of the battery cell assembly along the second direction, and the insulating plate is provided with through holes for the electrode terminals to pass through.

12. The battery device according to claim 11, characterized in that, The dimension of the insulating plate along the first direction is greater than the dimension of the first portion along the first direction.

13. The battery device according to claim 11, characterized in that, Along the first direction, the insulating plate is located on the side of the first portion opposite to the battery cell assembly.

14. The battery device according to claim 11, characterized in that, Along the first direction, the insulating film extends beyond both ends of the insulating plate.

15. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-14.

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