Battery device, energy storage device, energy storage system and electric device

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery device, an energy storage device, an energy storage system and a power utilization device. The battery device comprises a battery monomer assembly, the battery monomer assembly comprises a battery monomer group, a first binding band and a second binding band, the battery monomer group comprises a plurality of battery monomers arranged along a first direction, and the first binding band and the second binding band are arranged in a second direction and surround the battery monomer group; the number of the battery monomer assemblies is at least two, and the battery monomer assemblies comprise a first battery monomer assembly and a second battery monomer assembly which are adjacently arranged in a third direction; the battery device further comprises an insulating part which is arranged between the first battery monomer assembly and the second battery monomer assembly and at least partially located between the first binding belt and the second binding belt. In the technical scheme of the embodiment of the invention, the insulating part can be used for isolating the areas, between the first binding band and the second binding band, of the first battery monomer assembly and the second battery monomer assembly, so that the insulating effect is realized, and the use reliability of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery device, an energy storage device, an energy storage system, and an electrical device. Background Technology

[0002] In related technologies, if either of two adjacent battery cell modules expands or thermally runs away, it will come into contact with the other, causing insulation failure between the two and affecting the reliability of the battery device. Utility Model Content

[0003] In view of the above problems, this application provides a battery device and an electrical device that can meet the insulation requirements between two adjacent battery cells and improve the reliability of the battery device.

[0004] In a first aspect, this application provides a battery device including a battery cell assembly. The battery cell assembly includes a group of battery cells, a first strap, and a second strap. The group of battery cells includes a plurality of battery cells arranged along a first direction. The first strap and the second strap are spaced apart in a second direction and are both arranged around the group of battery cells. The number of battery cell assemblies is at least two and includes a first battery cell assembly and a second battery cell assembly arranged adjacent to each other in a third direction. The third direction is perpendicular to both the second direction and the first direction. The battery device also includes an insulating member disposed between the first battery cell assembly and the second battery cell assembly, and at least partially located between the first strap and the second strap.

[0005] In the technical solution of this application embodiment, by providing an insulating member between the first battery cell assembly and the second battery cell assembly, and by at least partially providing the insulating member between the first strap and the second strap, the insulating member can isolate the battery cell group of the first battery cell assembly and the battery cell group of the second battery cell assembly located in the area between the first strap and the second strap, thereby achieving an insulation effect. When either the first battery cell assembly or the second battery cell assembly expands or thermally runs away, the insulating member can provide lateral insulation protection for the first battery cell assembly and the second battery cell assembly, while also meeting industrial requirements and improving the reliability of the battery device.

[0006] In some embodiments, the insulating element includes a high-temperature resistant material layer. This configuration reduces the damage to the insulating element should one of the first or second battery cell assembly experience thermal runaway, enabling the insulating element to provide effective insulation protection and improving its reliability. This, in turn, reduces the impact of thermal runaway on the other of the first or second battery cell assembly.

[0007] In some embodiments, the insulating component includes at least one of a plastic-ceramic composite tape and a mica sheet. In the above technical solution, by setting the insulating component to include at least one of a plastic-ceramic composite tape and a mica sheet, the probability of damage to the insulating component can be reduced, and the reliability of the insulating component can be improved, thereby enhancing the reliability of the battery device.

[0008] In some embodiments, the thickness of the insulating component is less than 4 mm. In the above technical solution, by setting the thickness of the insulating component to less than 4 mm, while ensuring that the insulating component meets the insulation requirements, on the one hand, the expansion space of the battery cell group of the first battery cell assembly and the battery cell group of the second battery cell assembly can meet the design requirements, which is beneficial to improving the service life of the first battery cell assembly and the second battery cell assembly; on the other hand, the size of the battery device in the third direction can be reduced.

[0009] In some embodiments, the thickness of the insulating member is less than or equal to 2 mm. This configuration, while ensuring the insulating member meets the insulation requirements of both the first and second battery cell assemblies, reduces the space occupied by the insulating member in the third direction, thereby reducing the size of the battery device in the third direction and improving the service life of both the first and second battery cell assemblies.

[0010] In some embodiments, the thickness of the insulating member is less than the thickness of the first and second straps. In the above technical solution, by setting the thickness of the insulating member to be less than the thickness of the first and second straps, the expansion space of the battery cell group of the first battery cell assembly and the battery cell group of the second battery cell assembly meets design requirements, reducing compression that may occur when the first and / or second battery cell assemblies expand or experience thermal runaway, thereby improving the service life of the first and second battery cell assemblies.

[0011] In some embodiments, the insulating member is connected to the battery cell group of the battery cell assembly. In the above technical solution, by connecting the insulating member to the battery cell group of the battery cell assembly, the installation reliability of the insulating member can be improved, enabling the insulating member to meet the insulation requirements between the first battery cell assembly and the second battery cell assembly, reducing the problem of insulation failure due to the insulating member detaching, and thus improving the reliability of the battery device.

[0012] In some embodiments, the insulating member is adhesively bonded to the battery cell assembly. This connection is convenient and improves the installation reliability of the insulating member.

[0013] In some embodiments, the insulating member is located between the first strap and the second strap, and at least one of the first strap and the second strap is in contact with or has a gap with the insulating member in the second direction. In the above technical solution, by placing the insulating member between the first strap and the second strap, and ensuring that at least one of the first strap and the second strap is in contact with or has a gap with the insulating member in the second direction, the first strap or the second strap does not overlap with the insulating member. This facilitates a reduction in the size of the first battery cell assembly or the second battery cell assembly in the third direction, thereby reducing the size of the battery device in the third direction.

[0014] In some embodiments, the gap in the second direction is 1mm-4mm. In the above technical solution, by controlling the gap between the first or second strap and the insulating member to meet the above range, and ensuring that the insulating member can meet the insulation requirements between the battery cells of the first battery cell assembly and the battery cells of the second battery cell assembly, the first or second strap and the insulating member can be made to not overlap, thereby reducing the size of the first or second battery cell assembly in the third direction, and consequently reducing the size of the battery device in the third direction.

[0015] In some embodiments, the insulating element is at least partially clamped between the first strap and the battery cell assembly; and / or, the insulating element is at least partially clamped between the second strap and the battery cell assembly. In the above technical solution, by at least partially clamping the insulating element between the first strap and the battery cell assembly; and / or between the second strap and the battery cell assembly, the installation reliability of the insulating element can be improved, insulation failure due to detachment of the insulating element can be reduced, and the reliability of the battery device in use can be improved.

[0016] In some embodiments, at least one of the insulating elements is a first insulating element, which is connected to the side of the battery cell group of the first battery cell assembly facing the second battery cell assembly; and / or, at least one of the insulating elements is a second insulating element, which is connected to the side of the battery cell group of the second battery cell assembly facing the first battery cell assembly. In the above technical solution, by connecting the first insulating element to the side of the battery cell group of the first battery cell assembly facing the second battery cell assembly, and connecting the second insulating element to the side of the battery cell group of the second battery cell assembly facing the first battery cell assembly, it is equivalent to forming a double-layer insulation protection between the battery cell group of the first battery cell assembly and the battery cell group of the second battery cell assembly, further improving the reliability of the battery device.

[0017] In some embodiments, at least one of the first and second straps at least partially overlaps with the insulating element. By providing at least partial overlap between the first and second straps and the insulating element, at least double insulation protection can be achieved, improving the reliability of the battery device.

[0018] In some embodiments, the insulating member is at least partially clamped between at least one of the first and second straps of the battery cell assembly and the battery cell group of the battery cell assembly. In the above technical solution, by at least partially clamping the insulating member between the first and / or second straps of the battery cell assembly and the battery cell group, the installation reliability of the insulating member can be improved, insulation failure due to detachment of the insulating member can be reduced, and the reliability of the battery device in use can be improved.

[0019] In some embodiments, the insulating member is at least partially clamped between the first strap of the first battery cell assembly and the first strap of the second battery cell assembly; and / or, the insulating member is at least partially clamped between the second strap of the first battery cell assembly and the second strap of the second battery cell assembly. In the above technical solution, by at least partially clamping the insulating member between the first strap of the first battery cell assembly and the first strap of the second battery cell assembly; and / or between the second strap of the first battery cell assembly and the second strap of the second battery cell assembly, the installation reliability of the insulating member can be improved, insulation failure caused by the insulating member falling off can be reduced, and the reliability of the battery device in use can be improved.

[0020] In some embodiments, the ratio of the sum of the dimensions of the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction is 0.1-0.4, and the ratio of the distance between the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction is 0.2-0.7. In the above technical solution, by limiting the ratio of the sum of the dimensions of the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction, and the ratio of the distance between the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction, to satisfy the above ranges, the expansion of multiple battery cells can be effectively limited while reducing costs, which is beneficial to improving the reliability of the battery device.

[0021] In some embodiments, the battery cell assembly includes: a first end plate and a second end plate, disposed opposite to each other in a first direction; a plurality of battery cells are disposed between the first end plate and the second end plate; and each of the first strap and the second strap is disposed around the first end plate, the second end plate, and the plurality of battery cells; wherein the insulating member extends along the first direction, with one end extending toward the first end plate and the other end extending toward the second end plate. This configuration allows the insulating member to insulate the entire section between the first battery cell assembly and the second battery cell assembly in the first direction, further improving the reliability of the battery device.

[0022] In some embodiments, each of the first strap and the second strap includes a strap portion and an insulating portion, the insulating portion being at least partially disposed between the strap portion and the battery cell assembly. By disposing the insulating portion between the strap portion and the battery cell assembly, insulation protection can be achieved between the strap portion and the battery cell assembly. When used in conjunction with an insulating member, insulation protection can be achieved between the sides of the first battery cell assembly and the second battery cell assembly.

[0023] In some embodiments, the battery device further includes a housing, in which battery cell assemblies are disposed, and side insulation structures are provided between the battery cell assemblies and the housing on opposite sides in a third-direction direction. In the above technical solution, the housing can protect the battery cell assemblies, improving their reliability, while the side insulation structures between the battery cell assemblies and the housing further enhance the reliability of the battery device.

[0024] Secondly, this application provides an energy storage device, including a plurality of battery devices as described in the above embodiments, the battery devices being used to store or provide electrical energy.

[0025] The technical solutions in the embodiments of this application can improve the reliability of energy storage devices.

[0026] Thirdly, this application provides an energy storage system, including a power conversion device and an energy storage device as described in the above embodiments, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0027] The technical solutions in the embodiments of this application can improve the reliability of energy storage systems.

[0028] Fourthly, this application provides an electrical device that includes a battery device as described in the above embodiments, or an energy storage device as described in the above embodiments, or an energy storage system as described in the above embodiments, wherein the battery device is used to store or provide electrical energy.

[0029] The technical solutions in the embodiments of this application can improve the reliability of electrical devices.

[0030] 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, specific embodiments of this application are given below. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 Exploded views of battery devices provided in some embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the structure of two battery cell assemblies provided in some embodiments of this application;

[0034] Figure 3 A side view of two battery cell assemblies in one direction, provided for some embodiments of this application;

[0035] Figure 4 A side view of two battery cell assemblies provided in some embodiments of this application from another direction;

[0036] Figure 5 for Figure 4 An enlarged view of part A shown in the image;

[0037] Figure 6 A side view of two battery cell assemblies in one direction, provided for other embodiments of this application;

[0038] Figure 7 for Figure 6 An enlarged view of part B shown in the diagram;

[0039] Figure 8 A side view of two battery cell assemblies in one direction, provided for some embodiments of this application;

[0040] Figure 9 for Figure 8 An enlarged view of section C shown in the diagram;

[0041] Figure 10 A side view of two battery cell assemblies in one direction, provided for some embodiments of this application;

[0042] Figure 11 for Figure 10An enlarged view of part D shown;

[0043] Figure 12 Structural block diagrams of energy storage devices provided in some embodiments of this application;

[0044] Figure 13 Structural block diagrams of energy storage systems provided in some embodiments of this application;

[0045] Figure 14 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 1000 electrical appliances;

[0048] Battery device 100; controller 200; motor 300;

[0049] Energy storage device 400; power conversion device 500; power generation device 600;

[0050] Box body 11; First box section 111; Second box section 112;

[0051] Battery cell assembly 12; First battery cell assembly 12a; Second battery cell assembly 12b;

[0052] Battery cell assembly 120; first end plate 121; second end plate 122; battery cell 123; first binding strap 1241; second binding strap 1242.

[0053] Insulating component 13; first insulating component 13a; second insulating component 13b. Detailed Implementation

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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).

[0060] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0062] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but the market demand is also continuously expanding as the application areas of power batteries continue to broaden.

[0063] Typically, there is a gap between two adjacent battery cells in a battery device to allow for a certain degree of expansion. However, in related technologies, if either of the two adjacent battery cells expands or experiences thermal runaway, it will come into contact with the other, or even be compressed, leading to insulation failure between the two and affecting the reliability of the battery device.

[0064] Therefore, this application provides an insulating element between adjacent first and second battery cell assemblies, with the insulating element at least partially located between the first and second straps. When either the first or second battery cell assemblies expands or experiences thermal runaway, the insulating element can provide lateral insulation protection for both the first and second battery cell assemblies, while also meeting industrial requirements and improving the reliability of the battery device.

[0065] The battery device disclosed in this application can be used in electrical devices or various energy storage systems. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] Please refer to Figure 1 , Figure 1 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes battery cell assemblies 12. There can be multiple battery cell assemblies 12, which can be arranged side by side or in an array.

[0067] The battery cell assembly 12 may include multiple battery cells 123, and the multiple battery cells 123 of the battery cell assembly 12 may be connected in series, parallel, or in a mixed manner, and then the multiple battery cell assemblies 12 may be connected in series, parallel, or in a mixed manner to form a whole. Each battery cell 123 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 123 may be cylindrical, flat, cuboid, or other shapes.

[0068] 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 123.

[0069] The battery device 100 also includes a housing 11, within which the battery cell assembly 12 is housed. The housing 11 provides a space for the battery cell assembly 12, and can have various structures. In some embodiments, the housing 11 may include a first housing portion 111 and a second housing portion 112, which overlap each other, collectively defining a space for accommodating the battery cell assembly 12. The second housing portion 112 may be a hollow structure with one open end, while the first housing portion 111 may be a plate-like structure, covering the open side of the second housing portion 112 so that the first housing portion 111 and the second housing portion 112 together define the accommodating space. Alternatively, both the first housing portion 111 and the second housing portion 112 may be hollow structures with one open side, with the open side of the first housing portion 111 covering the open side of the second housing portion 112. Of course, the box 11 formed by the first box 111 and the second box 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0070] According to some embodiments of this application, refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of two battery cell assemblies 12 provided in some embodiments of this application. The battery cell assembly 12 includes a battery cell group 120, a first strap 1241, and a second strap 1242.

[0071] The battery cell assembly 120 includes a plurality of battery cells 123 arranged along a first direction. A first strap 1241 and a second strap 1242 are arranged at intervals in a second direction of the battery cell assembly 120. Both the first strap 1241 and the second strap 1242 are arranged around the battery cell assembly 120, thereby fixing the plurality of battery cells 123 of the battery cell assembly 120 together.

[0072] The number of battery cell components 12 is at least two, and the at least two battery cell components 12 include a first battery cell component 12a and a second battery cell component 12b. The first battery cell component 12a and the second battery cell component 12b are arranged adjacent to each other in the third direction, and the third direction is perpendicular to the second direction and the first direction.

[0073] like Figure 2 As shown in the diagram, the X direction is the second direction, specifically the height direction of the battery cell assembly 12, i.e., the vertical direction of the battery cell assembly 12; the Y direction is the third direction, specifically the width direction of the battery cell assembly 12, with at least two battery cell assemblies 12 arranged in the width direction of the battery cell assembly 12; and the Z direction is the first direction, specifically the length direction of the battery cell assembly 12.

[0074] Please refer to Figure 3 and Figure 4 , Figure 3 A side view of a battery cell assembly 12 in one direction, provided for some embodiments of this application; Figure 4 This is a side view of two battery cell assemblies 12 provided in some embodiments of this application from another direction. The battery device 100 also includes an insulator 13 disposed between the first battery cell assembly 12a and the second battery cell assembly 12b, and the insulator 13 is at least partially located between the first strap 1241 and the second strap 1242.

[0075] "Insulator 13" refers to a structural component capable of preventing the flow of current. "Insulator 13 being at least partially located between the first strap 1241 and the second strap 1242" means that the insulator 13 can at least isolate the portion of the battery cell group 120 of the first battery cell assembly 12a located between the first strap 1241 and the second strap 1242 from the portion of the battery cell group 120 of the second battery cell assembly 12b located between the first strap 1241 and the second strap 1242.

[0076] Taking the second direction as the vertical direction, with the first strap 1241 located above the second strap 1242 as an example, since the first strap 1241 and the second strap 1242 are arranged in the vertical direction, they can constrain the battery cell group 120 of the battery cell assembly 12. If the battery cell assembly 12 expands, the area of ​​the battery cell group 120 above the first strap 1241 and the area below the second strap 1242 will deform less, while the area of ​​the battery cell group 120 between the first strap 1241 and the second strap 1242 may bulge. By placing the insulating member 13 at least partially between the first strap 1241 and the second strap 1242, even if the first battery cell assembly 12a and / or the second battery cell assembly 12b bulges, the insulating member 13 can insulate the bulging position.

[0077] In the technical solution of this application embodiment, by providing an insulating member 13 between the first battery cell assembly 12a and the second battery cell assembly 12b, and by at least partially providing the insulating member 13 between the first strap 1241 and the second strap 1242, the insulating member 13 can isolate the area between the first strap 1241 and the second strap 1242 of the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b, thereby achieving an insulation effect. When either the first battery cell assembly 12a or the second battery cell assembly 12b expands or experiences thermal runaway, the insulating member 13 can provide lateral insulation protection for the first battery cell assembly 12a and the second battery cell assembly 12b, while also meeting industrial requirements and improving the reliability of the battery device 100.

[0078] In some embodiments, the insulating element 13 includes a high-temperature resistant material layer. Specifically, the high-temperature resistant range of the insulating element 13 can reach above 400°C. This configuration can reduce the damage to the insulating element 13 in the event of thermal runaway in either the first battery cell assembly 12a or the second battery cell assembly 12b, enabling the insulating element 13 to achieve effective insulation protection and improving its reliability. This, in turn, reduces the impact of thermal runaway on the other of the first battery cell assembly 12a and the second battery cell assembly 12b.

[0079] In some embodiments, the insulating element 13 includes at least one of a plastic-ceramic composite tape and a mica sheet.

[0080] For example, the insulating element 13 can be a plastic-ceramic composite tape. Plastic-ceramic composite tapes have good electrical insulation, flame retardancy, and resistance to high and low temperatures. By setting the insulating element 13 as a plastic-ceramic composite tape, good insulation, heat insulation, and flame retardancy effects can be achieved, reducing the probability of damage to the insulating element 13, reducing the mutual influence between the first battery cell assembly 12a and the second battery cell assembly 12b, and further improving the reliability of the battery device 100.

[0081] For example, the insulating component 13 can be a mica sheet. Mica sheets have excellent heat insulation properties, are not easily combustible at high temperatures, and can play a role in fire prevention and flame retardancy. Mica sheets also have excellent insulation properties, maintaining stable insulation performance in high-temperature environments. Therefore, by using a mica sheet as the insulating component 13, the probability of damage to the insulating component 13 in high-temperature environments can be reduced, improving the reliability of the insulating component 13 and thus enhancing the reliability of the battery device 100.

[0082] For example, the insulating element 13 can be a multi-layer structure and include a plastic-ceramic composite tape and a mica sheet.

[0083] In the above technical solution, by setting the insulating component 13 to include at least one of plastic ceramic composite tape and mica sheet, the probability of damage to the insulating component 13 can be reduced and the reliability of the insulating component 13 can be improved, thereby improving the reliability of the battery device 100.

[0084] Because the insulating component 13 occupies the space in the third direction between the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b, the expansion space in the third direction of the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b is reduced. Therefore, if the thickness M of the insulating component 13 is too large, it is easy to cause the first battery cell assembly 12a and the second battery cell assembly 12b to be squeezed when they expand or thermally run away, thus affecting the service life of the first battery cell assembly 12a and the second battery cell assembly 12b. On the other hand, it will increase the size of the battery device 100 in the third direction while keeping the expansion space of the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b unchanged.

[0085] Therefore, in some embodiments, please refer again Figure 5 The thickness M of the insulating component 13 is less than 4 mm. The thickness M of the insulating component 13 is the dimension of the insulating component 13 in the third direction. For example, the thickness M of the insulating component 13 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 3.9 mm, etc.

[0086] In the above technical solution, by setting the thickness of the insulating component 13 to less than 4mm, on the basis that the insulating component 13 can meet the insulation requirements, on the one hand, the expansion space of the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b can meet the design requirements, which is conducive to improving the service life of the first battery cell assembly 12a and the second battery cell assembly 12b. On the other hand, the size of the battery device 100 in the third direction can be reduced.

[0087] In some embodiments, the thickness of the insulating member 13 is less than or equal to 2 mm. For example, the thickness M of the insulating member 13 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, etc. With this configuration, while the insulating member 13 can meet the insulation requirements of the first battery cell assembly 12a and the second battery cell assembly 12b, the space occupied by the insulating member 13 in the third direction can be reduced, thereby reducing the size of the battery device 100 in the third direction and improving the service life of the first battery cell assembly 12a and the second battery cell assembly 12b.

[0088] Please refer to this again. Figure 5 In some embodiments, the thickness M of the insulating member 13 is less than the thickness S of the first strap 1241 and the second strap 1242. That is, the thickness of the insulating member 13 is less than both the thickness of the first strap 1241 and the thickness of the second strap 1242.

[0089] In the above technical solution, by setting the thickness of the insulating component 13 to be less than the thickness of the first binding strap 1241 and the second binding strap 1242, the expansion space of the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b meets the design requirements, reducing the squeezing that occurs when the first battery cell assembly 12a and / or the second battery cell assembly 12b expands or experiences thermal runaway, thereby improving the service life of the first battery cell assembly 12a and the second battery cell assembly 12b.

[0090] In this configuration, the distance N between the first battery cell assembly 12a and the second battery cell assembly 12b in the third direction at the first strap 1241 or the second strap 1242 is greater than zero; for example, N can be greater than 1 mm. The distance L between the first battery cell assembly 12a and the second battery cell assembly 12b in the third direction at the battery cell group 120 is greater than 4 mm, thereby providing a certain expansion space between the first battery cell assembly 12a and the second battery cell assembly 12b.

[0091] Please refer to this again. Figure 4 and further refer to Figure 5 , Figure 5 for Figure 4 An enlarged view of part A shown. In some embodiments, the insulating member 13 is connected to the battery cell group 120 of the battery cell assembly 12.

[0092] In other words, the insulating member 13 is disposed on the side of the battery cell group 120 of the battery cell assembly 12. For example, the insulating member 13 can be connected to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b, or the insulating member 13 can be connected to the side of the battery cell group 120 of the second battery cell assembly 12b facing the first battery cell assembly 12a.

[0093] In the above technical solution, by connecting the insulating component 13 to the battery cell group 120 of the battery cell assembly 12, the installation reliability of the insulating component 13 can be improved, so that the insulating component 13 can meet the insulation requirements between the first battery cell assembly 12a and the second battery cell assembly 12b, reducing the problem of insulation failure caused by the insulating component 13 falling off, which is conducive to improving the reliability of the battery device 100.

[0094] In some embodiments, the insulating member 13 is bonded to the battery cell group 120 of the battery cell assembly 12, which facilitates the connection and improves the installation reliability of the insulating member 13.

[0095] Please refer to this again. Figure 3In some embodiments, the insulating member 13 is located between the first strap 1241 and the second strap 1242, and at least one of the first strap 1241 and the second strap 1242 is in contact with or has a gap with the insulating member 13 in a second direction.

[0096] For example, the side of the insulating member 13 near the first strap 1241 has a gap with the first strap 1241, and the side of the insulating member 13 near the second strap 1242 is in contact with the second strap 1242 but does not overlap.

[0097] For example, the side of the insulating member 13 near the first strap 1241 is in contact with the first strap 1241 but does not overlap with it, and the side of the insulating member 13 near the second strap 1242 has a gap with the second strap 1242.

[0098] For example, the insulating member 13 has a gap between itself and the first strap 1241 on the side near the first strap 1241, and the insulating member 13 has a gap between itself and the second strap 1242 on the side near the second strap 1242.

[0099] For example, the side of the insulating member 13 near the first strap 1241 is in contact with the first strap 1241 but does not overlap, and the side of the insulating member 13 near the second strap 1242 is in contact with the second strap 1242 but does not overlap.

[0100] Generally, each of the first strap 1241 and the second strap 1242 includes a metal strip and an insulating layer, such that the first strap 1241, the insulating element 13 and the second strap 1242 are arranged in a second direction, and the first strap 1241, the insulating element 13 and the second strap 1242 can provide segmented insulation between the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b.

[0101] In the above technical solution, by placing the insulating member 13 between the first strap 1241 and the second strap 1242, and making at least one of the first strap 1241 and the second strap 1242 contact with the insulating member 13 in the second direction or having a gap, and the first strap 1241 or the second strap 1242 does not overlap with the insulating member 13, it is beneficial to reduce the size of the first battery cell assembly 12a or the second battery cell assembly 12b in the third direction, thereby reducing the size of the battery device 100 in the third direction.

[0102] In some embodiments, the gap is 1mm-4mm in the second direction. For example, the gap between the first strap 1241 or the second strap 1242 and the insulating member 13 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. in the second direction.

[0103] In the above technical solution, by controlling the gap between the first strap 1241 or the second strap 1242 and the insulating member 13 to meet the above range, and on the basis that the insulating member 13 can meet the insulation requirements between the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b, the first strap 1241 or the second strap 1242 and the insulating member 13 can be made not to overlap, thereby reducing the size of the first battery cell assembly 12a or the second battery cell assembly 12b in the third direction, and further reducing the size of the battery device 100 in the third direction.

[0104] Please refer to Figure 6 and Figure 7 , Figure 6 A side view of two battery cell assemblies 12 in one direction, provided for other embodiments of this application; Figure 7 for Figure 6 The enlarged view of part B shown. In some embodiments, the insulating member 13 is at least partially clamped between the first strap 1241 and the battery cell assembly 120. By clamping the insulating member 13 between the first strap 1241 and the battery cell assembly 120, at least double insulation protection can be achieved. Furthermore, the first strap 1241 can partially attach the insulating member 13 to the battery cell assembly 120 of the battery cell assembly 12, improving the installation reliability of the insulating member 13 and reducing insulation failure caused by the insulating member 13 falling off.

[0105] In other embodiments, the insulating member 13 is at least partially clamped between the second strap 1242 and the battery cell assembly 120. By clamping the insulating member 13 between the second strap 1242 and the battery cell assembly 120, at least double insulation protection can be achieved. Furthermore, the second strap 1242 can partially attach the insulating member 13 to the battery cell assembly 120 of the battery cell assembly 12, improving the installation reliability of the insulating member 13 and reducing insulation failure caused by the insulating member 13 falling off.

[0106] In some other embodiments, at least a portion of the insulating member 13 is clamped between the first strap 1241 and the battery cell assembly 120, and another portion is clamped between the second strap 1242 and the battery cell assembly 120. This arrangement can further improve the installation reliability of the insulating member 13, enabling the insulating member 13 to meet the insulation requirements between the first battery cell assembly 12a and the second battery cell assembly 12b, thereby improving the reliability of the battery device 100 in use.

[0107] In summary, in the above technical solution, by clamping the insulating component 13 at least partially between the first strap 1241 and the battery cell group 120; and / or between the second strap 1242 and the battery cell group 120, the installation reliability of the insulating component 13 can be improved, the insulation failure caused by the insulating component 13 falling off can be reduced, and the reliability of the battery device 100 can be improved.

[0108] Please refer to this again. Figure 4 and Figure 5 In some embodiments, at least one insulating member 13 is a first insulating member 13a, which is connected to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b.

[0109] For example, the first insulating member 13a may be bonded to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b. Specifically, the first insulating member 13a may be located between the first strap 1241 and the second strap 1242, or at least partially located between the first strap 1241 and the battery cell group 120 of the first battery cell assembly 12a; and / or at least partially located between the second strap 1242 and the battery cell group 120 of the first battery cell assembly 12a.

[0110] In the above technical solution, by connecting the first insulating member 13a to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b, the installation reliability of the first insulating member 13a can be improved, so that the first insulating member 13a can meet the insulation requirements between the first battery cell assembly 12a and the second battery cell assembly 12b, reducing the problem of insulation failure caused by the first insulating member 13a falling off, which is beneficial to improving the reliability of the battery device 100.

[0111] Please refer to Figure 8 and Figure 9 , Figure 8 A side view of two battery cell assemblies 12 in one direction, provided for some embodiments of this application; Figure 9 for Figure 8 An enlarged view of part C shown. In some embodiments, at least one insulating member 13 includes a second insulating member 13b, which is connected to the side of the battery cell assembly 120 of the second battery cell assembly 12b facing the first battery cell assembly 12a.

[0112] Specifically, at least two insulating members 13 are a first insulating member 13a and a second insulating member 13b. The first insulating member 13a is connected to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b, and the second insulating member 13b is connected to the side of the battery cell group 120 of the second battery cell assembly 12b facing the first battery cell assembly 12a.

[0113] The first insulating member 13a can be adhered to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b. Specifically, the first insulating member 13a can be located between the first strap 1241 and the second strap 1242, or at least partially located between the first strap 1241 and the battery cell group 120 of the first battery cell assembly 12a; and / or at least partially located between the second strap 1242 and the battery cell group 120 of the first battery cell assembly 12a.

[0114] The second insulating member 13b can be adhered to the side of the battery cell group 120 of the second battery cell assembly 12b facing the first battery cell assembly 12a. Specifically, the second insulating member 13b can be located between the first strap 1241 and the second strap 1242, or at least partially located between the first strap 1241 and the battery cell group 120 of the second battery cell assembly 12b; and / or at least partially located between the second strap 1242 and the battery cell group 120 of the second battery cell assembly 12b.

[0115] In the above technical solution, by connecting the first insulating member 13a to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b, and connecting the second insulating member 13b to the side of the battery cell group 120 of the second battery cell assembly 12b facing the first battery cell assembly 12a, it is equivalent to forming a double-layer insulation protection between the battery cell group 120 of the first battery cell assembly 12a and the battery cell group 120 of the second battery cell assembly 12b, thereby further improving the reliability of the battery device 100.

[0116] Please refer to Figure 10 and Figure 11 , Figure 10 A side view of two battery cell assemblies 12 in one direction, provided for some embodiments of this application; Figure 11 for Figure 10 An enlarged view of part D shown. In some embodiments, at least one of the first strap 1241 and the second strap 1242 at least partially overlaps with the insulating member 13.

[0117] For example, the insulating member 13 may be at least partially sandwiched between the first strap 1241 of the first battery cell assembly 12a and the battery cell group 120; or, for example, the insulating member 13 may be at least partially sandwiched between the second strap 1242 of the first battery cell assembly 12a and the battery cell group 120; or, for example, the insulating member 13 may be at least partially sandwiched between the first strap 1241 of the second battery cell assembly 12b and the battery cell group 120; or, for example, the insulating member 13 may be at least partially sandwiched between the second strap 1242 of the second battery cell assembly 12b and the battery cell group 120; or, for example, the insulating member 13 may be at least partially sandwiched between the first strap 1241 of the first battery cell assembly 12a and the first strap 1241 of the second battery cell assembly 12b; or, for example, the insulating member 13 may be at least partially sandwiched between the second strap 1242 of the first battery cell assembly 12a and the second strap 1242 of the second battery cell assembly 12b.

[0118] In the above technical solution, by at least one of the first strap 1241 and the second strap 1242 being arranged to at least partially overlap with the insulating member 13, at least double insulation protection can be achieved, thereby improving the reliability of the battery device 100.

[0119] In some embodiments, the insulating member 13 is at least partially clamped between at least one of the first strap 1241 and the second strap 1242 of the battery cell assembly 12 and the battery cell group 120 of the battery cell assembly 12.

[0120] In the above technical solution, by clamping the insulating member 13 at least partially between the first strap 1241 and / or the second strap 1242 of the battery cell assembly 12 and the battery cell assembly 120, the installation reliability of the insulating member 13 can be improved, the insulation failure caused by the insulating member 13 falling off can be reduced, and the reliability of the battery device 100 can be improved.

[0121] Please refer to this again. Figure 10 and Figure 11 In some embodiments, the insulating member 13 is at least partially clamped between the first strap 1241 of the first battery cell assembly 12a and the first strap 1241 of the second battery cell assembly 12b. By clamping the insulating member 13 between the first strap 1241 of the first battery cell assembly 12a and the first strap 1241 of the second battery cell assembly 12b, triple insulation protection can be achieved, and the installation reliability of the insulating member 13 can be improved, reducing insulation failure caused by the insulating member 13 falling off.

[0122] In other embodiments, the insulating member 13 is at least partially clamped between the second strap 1242 of the first battery cell assembly 12a and the second strap 1242 of the second battery cell assembly 12b. By clamping the insulating member 13 between the second strap 1242 of the first battery cell assembly 12a and the second strap 1242 of the second battery cell assembly 12b, triple insulation protection can be achieved, and the installation reliability of the insulating member 13 can be improved, reducing insulation failure caused by the insulating member 13 falling off.

[0123] In some other embodiments, the insulating member 13 is at least partially sandwiched between the first strap 1241 of the first battery cell assembly 12a and the first strap 1241 of the second battery cell assembly 12b, and between the second strap 1242 of the first battery cell assembly 12a and the second strap 1242 of the second battery cell assembly 12b. This arrangement further improves the installation reliability of the insulating member 13, enabling it to meet the insulation requirements between the first battery cell assembly 12a and the second battery cell assembly 12b, thereby improving the reliability of the battery device 100.

[0124] In summary, in the above technical solution, by at least partially clamping the insulating member 13 between the first strap 1241 of the first battery cell assembly 12a and the first strap 1241 of the second battery cell assembly 12b; and / or between the second strap 1242 of the first battery cell assembly 12a and the second strap 1242 of the second battery cell assembly 12b, the installation reliability of the insulating member 13 can be improved, the insulation failure caused by the insulating member 13 falling off can be reduced, and the reliability of the battery device 100 can be improved.

[0125] Please refer to this again. Figure 2 and Figure 3 In some embodiments, the ratio of the sum of the dimensions of the first strap 1241 and the second strap 1242 in the second direction to the dimension of the battery cell assembly 120 in the second direction is 0.1-0.4, and the ratio of the distance between the first strap 1241 and the second strap 1242 in the second direction to the dimension of the battery cell assembly 120 in the second direction is 0.2-0.7.

[0126] Specifically, the first strap 1241 has a dimension of h1 in the second direction, the second strap 1242 has a dimension of h2 in the second direction, the distance between the first strap 1241 and the second strap 1242 in the second direction is h3, the battery cell group 120 has a dimension of h in the second direction, (h1+h2) / h can be 0.1, 0.2, 0.3, 0.4, etc., and h3 / h can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0127] If the dimensions of the first strap 1241 and the second strap 1242 in the second direction are too large, it will increase the cost of the first strap 1241 and the second strap 1242, resulting in an increase in the overall cost of the battery device 100. If the dimensions of the first strap 1241 and the second strap 1242 in the second direction are too small, or if the distance between the first strap 1241 and the second strap 1242 in the second direction is too large or too small, it will be difficult to restrict the expansion of the battery cell 123, which may lead to uneven expansion when the battery cell 123 expands.

[0128] Therefore, in the above technical solution, by limiting the ratio of the sum of the dimensions of the first strap 1241 and the second strap 1242 in the second direction to the dimension of the battery cell group 120 in the second direction, and the ratio of the distance between the first strap 1241 and the second strap 1242 in the second direction to the dimension of the battery cell group 120 in the second direction to meet the above range, the expansion of multiple battery cells 123 can be well limited while reducing costs, which is beneficial to improving the reliability of the battery device 100.

[0129] Please refer to this again. Figure 2 and Figure 3 In some embodiments, the battery cell assembly 120 includes a first end plate 121 and a second end plate 122, which are disposed opposite to each other in a first direction. A plurality of battery cells 123 are located between the first end plate 121 and the second end plate 122. Each of the first strap 1241 and the second strap 1242 is disposed around the first end plate 121, the second end plate 122 and the plurality of battery cells 123, thereby connecting the first end plate 121, the second end plate 122 and the plurality of battery cells 123 together, so that the plurality of battery cells 123 are sandwiched between the first end plate 121 and the second end plate 122.

[0130] The insulating member 13 extends along the first direction, with one end of the insulating member 13 extending toward the first end plate 121 and the other end of the insulating member 13 extending toward the second end plate 122.

[0131] With this configuration, the insulating member 13 can insulate the entire section between the first battery cell assembly 12a and the second battery cell assembly 12b in the first direction, further improving the reliability of the battery device 100.

[0132] In some embodiments, each of the first strap 1241 and the second strap 1242 includes a strap portion and an insulating portion, the insulating portion being at least partially disposed between the strap portion and the battery cell assembly 120. The insulating portion may be disposed only on the side of the strap portion facing the battery cell assembly 120, or it may completely cover the outer periphery of the strap portion, i.e., the insulating portion may be fitted over the outside of the strap portion. The strap portion may be a metal strip, such as a steel strip.

[0133] In the above technical solution, by placing the insulating part between the strap part and the battery cell assembly 120, insulation protection between the strap part and the battery cell assembly 120 of the battery cell assembly 12 can be achieved. When used in conjunction with the insulating member 13, insulation protection between the sides of the first battery cell assembly 12a and the second battery cell assembly 12b can be achieved.

[0134] Please refer to this again. Figure 1 The battery device 100 also includes a housing 11, with battery cell assembly 12 disposed inside the housing 11. The battery cell assembly 12 has a side insulation structure (not shown in the figure) between its two opposite sides in the third direction and the housing 11.

[0135] For example, the housing 11 may include a first housing portion 111 and a second housing portion 112, with the first housing portion 111 disposed above the second housing portion 112. If the upper first housing portion 111 is made of plastic, then it is not necessary to provide a side insulation structure between the two side walls of the battery cell assembly 12 disposed opposite each other in the third direction and the side wall of the first housing portion 111.

[0136] Generally, the lower second housing 112 is a metal housing. If the gap between the side wall of the second housing 112 and the two side walls of the battery cell assembly 12 that are opposite each other in the third direction is large, the side insulation structure can be an insulating varnish on the inner surface of the side wall of the second housing 112, which can meet the insulation requirements. If the gap between the side wall of the second housing 112 and the two side walls of the battery cell assembly 12 that are opposite each other in the third direction is small, the side insulation structure can be a separately formed insulating board, etc., to meet the insulation requirements.

[0137] In the above technical solution, the housing 11 can protect the battery cell assembly 12 and improve the reliability of the battery cell assembly 12. Furthermore, by setting a side insulation structure between the battery cell assembly 12 and the housing 11, the reliability of the battery device 100 is further improved.

[0138] According to some embodiments of this application, a battery device 100 is provided. The battery device 100 includes at least two adjacent battery cell assemblies 12 and an insulating member 13. Each battery cell assembly 12 includes a battery cell group 120, a first strap 1241 and a second strap 1242. The first strap 1241 and the second strap 1242 are arranged in the height direction of the battery cell group 120 and are both arranged around the battery cell group 120. The two adjacent battery cell assemblies 12 are a first battery cell assembly 12a and a second battery cell assembly 12b, respectively. The insulating member 13 is connected to the side of the battery cell group 120 of the first battery cell assembly 12a facing the second battery cell assembly 12b, and the insulating member 13 is located between the first strap 1241 and the second strap 1242. There is a gap between the insulating member 13 and the first strap 1241, and there is also a gap between the insulating member 13 and the second strap 1242.

[0139] Please refer to Figure 12 , Figure 12 This is a structural block diagram of an energy storage device 400 provided in some embodiments of this application. This application provides an energy storage device 400, including multiple battery devices 100 as described in the above embodiments, the battery devices 100 being used to store or provide electrical energy.

[0140] The energy storage device 400 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 400 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 400 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0141] In some embodiments, the energy storage device 400 is an energy storage container or an energy storage cabinet.

[0142] In some embodiments, the energy storage device 400 may include a cabinet and one or more battery clusters housed in the cabinet.

[0143] In some embodiments, the energy storage device 400 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0144] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping for regulating the temperature of the individual battery cells.

[0145] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0146] As an example, the central control module can serve as the battery management unit of the energy storage device 400, used to monitor and manage the energy storage device 400. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 400. For example, it can control the charging and discharging current and voltage of the energy storage device 400. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0147] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0148] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device 400.

[0149] Please refer to Figure 13 , Figure 13 This is a structural block diagram of an energy storage system provided in some embodiments of this application. This application provides an energy storage system including a power conversion device 500 and an energy storage device 400 as described in the above embodiments. The power conversion device 500 is used to electrically connect a power generation device 600 and an energy storage device 400.

[0150] A power conversion device 500 is used to connect between the power generation device 600 and the energy storage device 400. The power generation device 600 generates electrical energy, which can be stored in the energy storage device 400 via the power conversion device 500. As an example, the power generation device 600 can specifically be a solar panel, a hydroelectric power generation device 600, a thermal power generation device 600, a wind power generation device 600, etc. The specific type of the power generation device 600 is not limited in this application.

[0151] The energy storage system provided in this application embodiment can be any power system that requires the use of energy storage device 400.

[0152] Please refer to Figure 14 , Figure 14This is a schematic diagram of the structure of an electrical device 1000 provided in some embodiments of this application. This application provides an electrical device 1000, which includes a battery device 100 as described in the above embodiments, an energy storage device 400 as described in the above embodiments, or an energy storage system as described in the above embodiments. The battery device 100 is used to store or provide electrical energy.

[0153] The electrical device 1000 can be any of the aforementioned battery-using devices or systems.

[0154] In the technical solution of this application embodiment, by adopting the above-described battery device 100, the reliability of the power-consuming device 1000 can be improved.

[0155] In some embodiments, the electrical device 1000 is a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle; a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle 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 during starting, navigation, and driving.

[0156] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The device includes a battery cell assembly, which includes a battery cell group, a first strap and a second strap. The battery cell group includes a plurality of battery cells arranged along a first direction. The first strap and the second strap are arranged at intervals in a second direction and are both arranged around the battery cell group. The number of battery cell assemblies is at least two and includes a first battery cell assembly and a second battery cell assembly arranged adjacent to each other in a third direction, wherein the third direction is perpendicular to both the second direction and the first direction. The battery device further includes an insulating element disposed between the first battery cell assembly and the second battery cell assembly, and at least partially located between the first strap and the second strap.

2. The battery device according to claim 1, characterized in that, The insulating component includes a high-temperature resistant material layer.

3. The battery device according to claim 1, characterized in that, The insulating component includes at least one of plastic-ceramic composite tape and mica sheet.

4. The battery device according to claim 1, characterized in that, The thickness of the insulating component is less than 4 mm.

5. The battery device according to claim 4, characterized in that, The thickness of the insulating component is less than or equal to 2 mm.

6. The battery device according to claim 1, characterized in that, The thickness of the insulating component is less than the thickness of the first and second straps.

7. The battery device according to claim 1, characterized in that, The insulating element is connected to the battery cell assembly.

8. The battery device according to claim 7, characterized in that, The insulating component is bonded to the battery cell assembly.

9. The battery device according to claim 7, characterized in that, The insulating element is located between the first strap and the second strap, and at least one of the first strap and the second strap is in contact with or has a gap with the insulating element in the second direction.

10. The battery device according to claim 9, characterized in that, The gap in the second direction has a size of 1mm-4mm.

11. The battery device according to claim 7, characterized in that, The insulating element is at least partially clamped between the first strap and the battery cell assembly; and / or, the insulating element is at least partially clamped between the second strap and the battery cell assembly.

12. The battery device according to claim 1, characterized in that, At least one of the insulating elements is a first insulating element, the first insulating element being connected to the side of the battery cell group of the first battery cell assembly facing the second battery cell assembly; and / or, at least one of the insulating elements is a second insulating element, the second insulating element being connected to the side of the battery cell group of the second battery cell assembly facing the first battery cell assembly.

13. The battery device according to claim 1, characterized in that, At least one of the first and second straps at least partially overlaps with the insulating element.

14. The battery device according to claim 13, characterized in that, The insulating element is at least partially clamped between at least one of the first and second straps of the battery cell assembly and the battery cell group of the battery cell assembly.

15. The battery device according to claim 13, characterized in that, The insulating element is at least partially clamped between the first strap of the first battery cell assembly and the first strap of the second battery cell assembly; And / or, the insulating element is at least partially clamped between the second strap of the first battery cell assembly and the second strap of the second battery cell assembly.

16. The battery device according to any one of claims 1-15, characterized in that, The ratio of the sum of the dimensions of the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction is 0.1-0.4, and the ratio of the distance between the first and second straps in the second direction to the dimension of the battery cell assembly in the second direction is 0.2-0.

7.

17. The battery device according to any one of claims 1-15, characterized in that, The battery cell pack includes: A first end plate and a second end plate are disposed opposite to each other in the first direction, and a plurality of battery cells are disposed between the first end plate and the second end plate. Each of the first strap and the second strap is disposed around the first end plate, the second end plate and the plurality of battery cells. The insulating element extends along the first direction, with one end extending toward the first end plate and the other end extending toward the second end plate.

18. The battery device according to any one of claims 1-15, characterized in that, Each of the first strap and the second strap includes a strap portion and an insulating portion, the insulating portion being at least partially disposed between the strap portion and the battery cell assembly.

19. The battery device according to any one of claims 1-15, characterized in that, The battery device also includes a housing, the battery cell assembly is disposed in the housing, and the battery cell assembly has a side insulation structure between its two opposite sides in the third direction and the housing.

20. An energy storage device, characterized in that, It includes a plurality of battery devices according to any one of claims 1-19, the battery devices being used to store or provide electrical energy.

21. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 20, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

22. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-19, or an energy storage device as described in claim 20, or an energy storage system as described in claim 21, wherein the battery device is used to store or provide electrical energy.

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