Battery device and energy storage device

Abstract

Embodiments of the present application provide a battery device and an energy storage device. The battery device comprises a battery cell assembly and a binding member. The battery cell assembly comprises a plurality of battery cells. The binding member surrounds the battery cell assembly so as to bind the plurality of battery cells. The binding member comprises a metal strip and a first insulating layer. The first insulating layer covers at least part of the outer surface of the metal strip. The first insulating layer is configured to insulate and isolate the metal strip from the battery cells. The material damage temperature of the first insulating layer is greater than or equal to 250°C. By configuring the first insulating layer to cover at least part of the outer surface of the metal strip, the first insulating layer can insulate the metal strip from the battery cell assembly. By setting the material damage temperature of the first insulating layer to be greater than or equal to 250°C, the risk of the melting of the first insulating layer caused by high temperature can be reduced, thereby reducing the risk of an insulation failure between the metal strip and the battery cell assembly, and improving the reliability of the battery device.

Description

Battery devices and energy storage devices CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202420390717.0, filed on February 29, 2024, entitled “Battery, Electrical Equipment, and Energy Storage Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery device and an energy storage device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. Besides considering the performance of battery devices, their reliability is also a critical issue. Therefore, improving battery reliability is a pressing technical challenge in battery technology. Summary of the Invention

[0005] The present application provides a battery device and an energy storage device, which can improve the reliability of the battery device.

[0006] In a first aspect, embodiments of the present application provide a battery device comprising a battery cell assembly and a binding member. The battery cell assembly comprises a plurality of battery cells. The binding member is disposed around the battery cell assembly to bind the plurality of battery cells. The binding member comprises a metal strap and a first insulating layer, the first insulating layer covering at least a portion of the outer surface of the metal strap and configured to insulate and separate the metal strap from the battery cells. The material damage temperature of the first insulating layer is greater than or equal to 250°C.

[0007] In the above technical solution, by providing a first insulating layer covering at least a portion of the outer surface of the metal strip, the first insulating layer can insulate the metal strip from the battery cell assembly. By setting the material damage temperature of the first insulating layer to be greater than or equal to 250°C, the risk of the first insulating layer melting due to high temperatures can be reduced, thereby reducing the risk of insulation failure between the metal strip and the battery cell assembly, thereby improving the reliability of the battery device.

[0008] In some embodiments, within the cross-section of the binding, the first insulating layer is an open structure extending along the circumference of the metal strip, with the cross-section perpendicular to the extension direction of the binding. This open structure of the first insulating layer facilitates the installation of the first insulating layer and the metal strip, reducing the difficulty of installing the metal strip and the first insulating layer. Furthermore, the open structure helps reduce the material usage of the first insulating layer, thereby reducing the manufacturing cost of the battery device.

[0009] In some embodiments, an opening is formed within the cross-section of the binding member between the two ends of the first insulating layer. The opening is located on the side of the metal strip facing away from the battery cell assembly. This opening facilitates the mating of the first insulating layer with the metal strip through the opening, reducing the difficulty of installing the metal strip and the first insulating layer. Furthermore, the location of the opening on the side of the metal strip facing away from the battery cell enhances the insulation effect of the first insulating layer on the metal strip and the battery cell assembly, reduces material usage for the first insulating layer, and lowers the manufacturing cost of the binding member.

[0010] In some embodiments, within the cross-section of the binding, the first insulating layer is a closed structure extending along the circumference of the metal strip, with the cross-section perpendicular to the extension direction of the binding. This configuration improves the insulation effect of the first insulating layer on the metal strip, reduces the risk of insulation failure between the metal strip and other components, and improves the reliability of the battery device.

[0011] In some embodiments, the metal strip has a first surface facing the battery cell assembly, and the first insulating layer covers the portion of the first surface facing the battery cell. The metal strip has a first end and a second end opposite each other along the width of the metal strip, and the first insulating layer protrudes beyond the first and second ends along the width of the metal strip. This portion of the first insulating layer protruding beyond the metal strip along the width of the metal strip increases the creepage distance between the battery cell and the metal strip, further reducing the risk of insulation failure between the metal strip and the battery cell.

[0012] In some embodiments, the metal strip has a second surface facing away from the battery cell assembly; the first insulating layer has two ends disposed opposite each other along the width of the metal strip, both ends being located on the second surface. This, on the one hand, provides a more stable connection between the first insulating layer and the metal strip, reducing the risk of the first insulating layer falling off the metal strip; on the other hand, the first insulating layer increases the creepage distance between the battery cell and the metal strip, reducing the risk of insulation failure between the metal strip and the battery cell.

[0013] In some embodiments, the first insulating layer is an insulating tape wrapped around the metal tape, which facilitates installation of the insulating tape and reduces assembly difficulty between the insulating tape and the metal tape.

[0014] In some embodiments, the positive active material of the positive electrode plate of the battery cell includes lithium phosphate, and the material damage temperature of the first insulating layer is 250°C-500°C. Thus, when a battery cell whose positive active material is lithium phosphate experiences thermal runaway, the first insulating layer can withstand the high temperature generated by the thermal runaway, thereby reducing the risk of damage to the first insulating layer and causing a lap short circuit between the metal strip and the battery cell.

[0015] In some embodiments, the positive active material of the positive electrode sheet of the battery cell includes Li a Ni b Co c M d O e A f , where 0 < a ≤ 1.2; 0 < b < 1; 0 < c < 1; 0 < d < 1; 1 ≤ e ≤ 2; 0 ≤ f ≤ 1; M includes, but is not limited to, one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B; A includes, but is not limited to, one or more of N, F, S, and Cl; and the material damage temperature of the first insulating layer is greater than or equal to 400°C. In this way, the first insulating layer has higher heat resistance and can withstand temperatures below 400°C in the event of thermal runaway of the battery cell. This improves the heat resistance of the first insulating layer, giving it a better insulation effect and reducing the risk of overlapping short circuits between the battery cell and the metal strip.

[0016] In some embodiments, the first insulating layer is made of at least one of ceramic, mica, polyimide, and polytetrafluoroethylene. Manufacturing the first insulating layer from ceramic, mica, polyimide, and polytetrafluoroethylene balances the insulating performance and heat resistance of the first insulating layer, improving the insulating effect of the first insulating layer on the metal strip and battery cell assembly, and reducing the risk of insulation failure caused by damage to the first insulating layer at high temperatures.

[0017] In some embodiments, the first insulating layer includes a stacked main layer and a heat-resistant layer; the heat-resistant layer is disposed on the side of the main layer facing away from the metal strip. This heat-resistant layer enhances the heat resistance of the main layer on the side facing away from the metal strip, reducing the risk of high temperatures in the battery cell assembly damaging the first insulating layer, thereby reducing the risk of insulation failure in the metal strip and the battery cell assembly.

[0018] In some embodiments, the first insulating layer includes a stacked main layer and a heat-resistant layer; the heat-resistant layer is provided on the side of the main layer facing the metal strip. This heat-resistant layer strengthens the side of the main layer facing the metal strip, reducing the risk of high temperatures from the metal strip damaging the first insulating layer, thereby reducing the risk of insulation failure between the metal strip and the battery cell assembly.

[0019] In some embodiments, the first insulating layer includes a stacked main body layer and a heat-resistant layer; the heat-resistant layer is provided on the side of the main body layer facing away from the metal strip; and the heat-resistant layer is provided on the side of the main body layer facing the metal strip. This heat-resistant layer enhances the first insulating layer's ability to withstand the high temperatures of the metal strip and the battery cell assembly, reducing the risk of insulation failure in the metal strip and battery cell assembly.

[0020] In some embodiments, the heat-resistant layer is made of ceramic silicone rubber; and / or the main layer is made of fiberglass cloth. Using ceramic silicone rubber as the heat-resistant layer enhances the insulation and heat resistance between the metal strip and the battery cell assembly. Using fiberglass cloth as the main layer enhances the insulation performance of the first insulating layer. Furthermore, the fiberglass cloth, acting as a carrier for the heat-resistant layer, stabilizes the heat-resistant layer and provides good toughness for the first insulating layer, reducing the risk of damage.

[0021] In some embodiments, the thickness of the first insulating layer is 0.15 mm to 1 mm. When the thickness of the first insulating layer is greater than or equal to 0.15 mm, the insulation performance of the first insulating layer can be improved, reducing the risk of insulation failure of the battery cell assembly and the metal strip. When the thickness of the first insulating layer is less than or equal to 1 mm, the size of the bundle can be reduced, reducing the space occupied by the bundle in the battery cell assembly, and improving the volumetric energy density of the battery device. Therefore, when the thickness of the first insulating layer is 0.15 mm to 1 mm, it is possible to both improve the insulation performance of the first insulating layer and reduce the size of the bundle, thereby reducing the risk of insulation failure of the battery cell assembly and the metal strip and improving the volumetric energy density of the battery device.

[0022] In some embodiments, the thickness of the first insulating layer is 0.15 mm to 0.5 mm. When the thickness of the first insulating layer is less than or equal to 0.5 mm, the size of the bundle can be further reduced, reducing the space occupied by the bundle in the battery cell assembly, thereby increasing the volumetric energy density of the battery device. Therefore, when the thickness of the first insulating layer is 0.15 mm to 0.5 mm, the insulation performance of the first insulating layer can be further improved and the size of the bundle can be reduced, thereby further reducing the risk of insulation failure of the battery cell assembly and the metal strip and increasing the volumetric energy density of the battery device.

[0023] In some embodiments, the first insulating layer is bonded to the metal strip, thereby making the connection between the first insulating layer and the metal strip more stable and improving the structural stability of the binding.

[0024] In some embodiments, the binding member further includes a second insulating layer that covers at least a portion of the outer surface of the first insulating layer. Thus, the first insulating layer can further enhance the insulation between the metal strip and the battery cell assembly, while the second insulating layer can also constrain the position of the first insulating layer, improving its structural stability.

[0025] In some embodiments, the second insulating layer is a tubular member, and the metal strip and the first insulating layer are both located within the tubular member. Configuring the second insulating layer as a tubular member facilitates installation of the second insulating layer and facilitates securing the first insulating layer to the outer surface of the metal strip.

[0026] In some embodiments, the second insulating layer is a heat shrink tube, which makes installation of the second insulating layer more convenient and reduces assembly costs of the second insulating layer.

[0027] In some embodiments, the material damage temperature of the first insulating layer is greater than the material damage temperature of the second insulating layer. Thus, the first insulating layer can withstand higher temperatures than the second insulating layer. When the second insulating layer is damaged by heat, the first insulating layer can reduce the risk of insulation failure between the battery cells and the metal strips, thereby improving the reliability of the battery device.

[0028] In a second aspect, an embodiment of the present application provides an energy storage device, comprising the battery device provided in any one embodiment of the first aspect.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0031] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0032] FIG2 is an exploded view of a battery device provided in some embodiments of the present application;

[0033] FIG3 is a schematic structural diagram of a battery device provided in some embodiments of the present application;

[0034] FIG4 is a schematic structural diagram of a binding member provided in some embodiments of the present application;

[0035] FIG5 is a cross-sectional view AA in FIG4;

[0036] FIG6 is a schematic structural diagram of a binding member provided in some other embodiments of the present application;

[0037] FIG7 is a schematic structural diagram of a binding member provided in some embodiments of the present application (showing an insulating tape);

[0038] FIG8 is a schematic structural diagram of a battery device provided in yet other embodiments of the present application;

[0039] FIG9 is a schematic structural diagram of a battery device provided in some further embodiments of the present application;

[0040] FIG10 is a schematic structural diagram of a battery device provided in some other embodiments of the present application;

[0041] FIG11 is a schematic structural diagram of a binding member provided in some further embodiments of the present application;

[0042] In the drawings, the drawings are not drawn to scale.

[0043] Marking instructions: 1-metal strip; 11-first surface; 12-second surface; 13-first end; 14-second end; 2-first insulating layer; 21-end; 22-opening; 23-main layer; 24-heat-resistant layer; 25-insulating strip; 3-second insulating layer; 10-bundle; 20-battery cell assembly; 201-battery cell; 30-casing; 301-first casing; 302-second casing; 100-battery device; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0044] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0049] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0052] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0053] In some embodiments, the battery cell includes a housing that is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), or the like.

[0054] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal battery cells. Polygonal battery cells are, for example, hexagonal battery cells.

[0055] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0056] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells. As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0057] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0058] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0059] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0060] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0061] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0062] As an example, the box body may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0063] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0064] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0065] In battery technology, multiple battery cells can be connected in series, parallel, or mixed together to form a battery cell assembly to achieve higher voltage and capacity. To ensure the structural stability of the battery cell assembly, multiple battery cells can be bundled together using binding brackets, which facilitates the placement and installation of the battery cell assembly. To increase the strength and reduce the size of the binding brackets, binding brackets are typically made of metal. However, when binding battery cells with metal casings, the metal parts of the binding brackets are prone to contact with the metal casings of the battery cells, increasing the risk of short circuits in the battery cells.

[0066] An insulating layer can be provided on the metal material of the binding to improve the insulation performance between the metal material of the binding and the battery cell assembly. However, the battery cell assembly easily generates heat during use, causing the battery device to be stored in a high-temperature environment. The high temperature can easily damage the insulating layer of the binding, resulting in the risk of insulation failure between the metal material of the binding and the battery cell assembly, reducing the reliability of the battery device.

[0067] In view of this, to improve the reliability of a battery device, an embodiment of the present application provides a battery device comprising a battery cell assembly and a binding member. The battery cell assembly comprises a plurality of battery cells. The binding member is disposed around the battery cell assembly to bind the plurality of battery cells. The binding member comprises a metal strip and a first insulating layer, the first insulating layer covering at least a portion of the outer surface of the metal strip. The first insulating layer is configured to insulate and isolate the metal strip from the battery cells. The material damage temperature of the first insulating layer is greater than or equal to 250°C.

[0068] In such a battery device, a first insulating layer covering at least a portion of the outer surface of the metal strip insulates the metal strip from the battery cell assembly. Setting the material damage temperature of the first insulating layer to greater than or equal to 250°C reduces the risk of melting the first insulating layer due to high temperatures, thereby reducing the risk of insulation failure between the metal strip and the battery cell assembly and improving the reliability of the battery device.

[0069] The binding described in the embodiments of the present application is applicable to a battery device and an electrical device using the battery device.

[0070] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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.

[0071] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0072] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery device 100 is disposed within vehicle 1000. Battery device 100 can be located at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as the operating power source of vehicle 1000.

[0073] The vehicle 1000 may further 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 requirements of the vehicle 1000 during startup, navigation, and driving.

[0074] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a housing 30 and a battery cell 201. The housing 30 is used to accommodate the battery cell 201.

[0076] Among them, a closed space for accommodating the battery cells 201 is formed inside the box body 30. The box body 30 can adopt various structures. In some embodiments, the box body 30 may include a first box body 301 and a second box body 302, and the first box body 301 and the second box body 302 are buckled together. The first box body 301 and the second box body 302 can be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first box body 301 can be a hollow structure with one side open, and the second box body 302 can also be a hollow structure with one side open. The open side of the second box body 302 is buckled with the open side of the first box body 301 to form a box body 30 with a closed space. The first box body 301 can also be a hollow structure with one side open, and the second box body 302 can be a plate-shaped structure. The second box body 302 is buckled with the open side of the first box body 301 to form a box body 30 with a accommodating space.

[0077] In the battery device 100, there are multiple battery cells 201. These battery cells 201 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the battery cells 201. Multiple battery cells 201 can be connected in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules can then be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 30. Alternatively, all battery cells 201 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 201 can be housed within the housing 30.

[0078] Please refer to Figures 3 to 5. Figure 3 is a structural schematic diagram of a battery device 100 provided in some embodiments of the present application; Figure 4 is a structural schematic diagram of a binding member 10 provided in some embodiments of the present application; and Figure 5 is an AA cross-sectional view in Figure 4. An embodiment of the present application provides a battery device 100, comprising a battery cell assembly 20 and a binding member 10. The battery cell assembly 20 comprises a plurality of battery cells 201. The binding member 10 is arranged around the battery cell assembly 20 to bind the plurality of battery cells 201, and the binding member 10 comprises a metal strip 1 and a first insulating layer 2, the first insulating layer 2 covering at least a portion of the outer surface of the metal strip 1, and the first insulating layer 2 is configured to insulate and isolate the metal strip 1 and the battery cells 201. The material damage temperature of the first insulating layer 2 is greater than or equal to 250°C.

[0079] The battery device 100 may include one battery cell assembly 20 or a plurality of battery cell assemblies 20 . Each battery cell assembly 20 has a position where the binding member 10 binds the battery cells 201 of the battery cell assembly 20 .

[0080] The battery cell assembly 20 includes multiple battery cells 201. The multiple battery cells 201 can be stacked in the same direction to form a column of battery cell assemblies 20, and the binding piece 10 binds the column of battery cell assemblies 20; the multiple battery cells 201 can also be arranged in multiple rows and columns to form a cluster of battery cell assemblies 20, and the binding piece 10 binds the cluster of battery cell assemblies 20. The number of battery cells 201 in each row and each column can be equal or unequal.

[0081] The number of binding members 10 can be one or more. The binding member 10 can contact each battery cell 201 in the battery cell assembly 20 to restrain the battery cells 201 in place. Alternatively, the binding member 10 can contact only some of the battery cells 201 in the battery cell assembly 20, with the battery cells 201 squeezing against each other to secure the battery cells 201 in place. In embodiments with multiple binding members 10, the binding members 10 can be spaced apart or arranged in a staggered arrangement.

[0082] The metal strap 1 of the binding 10 is a strip-shaped structure disposed around the battery cell assembly 20. At least a portion of the first insulating layer 2 is disposed between the metal strap 1 and the battery cell assembly 20 to insulate the metal strap 1 from the battery cells 201. The first insulating layer 2 may cover only a portion of the outer surface of the metal strap 1, or it may cover the entire outer surface of the metal strap 1.

[0083] The material damage temperature of the first insulating layer 2 is the melting point of the first insulating layer 2 or the thermal decomposition temperature of the first insulating layer 2. In embodiments where the material of the first insulating layer 2 has only a melting point, the material damage temperature of the first insulating layer 2 is the melting point of the first insulating layer 2; in embodiments where the material of the first insulating layer 2 has only a thermal decomposition temperature, the material damage temperature of the first insulating layer 2 is the thermal decomposition temperature of the first insulating layer 2; when the material of the first insulating layer 2 has both a melting point and a thermal decomposition temperature, the lower of the melting point and the thermal decomposition temperature of the first insulating layer 2 is the material damage temperature of the first insulating layer 2.

[0084] The material damage temperature of the first insulating layer 2 can be 250℃, 300℃, 350℃, 400℃, 450℃, 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, 800℃, 850℃, 900℃, 950℃, 1000℃, 1050℃, 1100℃, 1200℃, 1300℃, 1400℃, 1500℃, 1600℃, 1700℃, 1800℃, 2000℃, etc.

[0085] In the embodiment of the present application, by providing the first insulating layer 2 to cover at least a portion of the outer surface of the metal strip 1, the first insulating layer 2 can insulate the metal strip 1 from the battery cell assembly 20. When thermal runaway occurs, the battery device 100 is bundled.

[0086] 3 to 5 , in the cross section of the binding member 10 , the first insulating layer 2 is a non-enclosed structure extending along the circumference of the metal strip 1 , and the cross section is perpendicular to the extending direction of the binding member 10 .

[0087] The binding member 10 is a strip-like structure, and its cross-section is perpendicular to the direction in which the strip-like structure extends. For example, as shown in Figure 3, a battery cell assembly 20 includes a plurality of battery cells 201 arranged along a first direction X, with the major surface of each battery cell 201 being perpendicular to the first direction X. The binding member 10 binds the plurality of battery cells 201 together; the binding member 10 includes a first portion extending along the first direction X and a second portion extending along a second direction Y, with the major surfaces of the battery cells 201 facing the second portion. The cross-section of the binding member 10 in the first portion is perpendicular to the first direction X, and the cross-section of the binding member 10 in the second portion is perpendicular to the second direction Y. The first direction X and the second direction Y are perpendicular.

[0088] In the cross-section of each bundle 10, the first insulating layer 2 has an open structure extending along the circumference of the metal strip 1. This open structure means that the first insulating layer 2 has two ends 21 in the cross-section, which are spaced apart so that the two ends 21 do not touch, thereby forming an open structure in the cross-section of the first insulating member. The open structure of the first insulating layer 2 can be located on the side of the metal strip 1 facing the battery cell 201, or on the side of the metal strip 1 facing away from the battery cell 201. Since the cross-section of the first insulating member can be continuous, the open structure of the first insulating member can also be continuous.

[0089] In this embodiment, by setting the first insulating layer 2 as a non-enclosed structure, on the one hand, it is beneficial to the installation of the first insulating layer 2 and the metal strip 1, and reduces the difficulty of installing the metal strip 1 and the first insulating layer 2; on the other hand, the non-enclosed structure helps to reduce the material usage of the first insulating layer 2, and reduces the manufacturing cost of the battery device 100.

[0090] In some embodiments, please continue to refer to FIG5 . In the cross section of the bundle 10 , an opening 22 is formed between the two ends of the first insulating layer 2 . The opening 22 is located on the side of the metal strip 1 facing away from the battery cell assembly 20 .

[0091] The two ends 21 of the first insulating layer 2 are located on the same side of the metal strip 1 , so that an opening 22 is formed between the two ends 21 . It can be understood that the two ends 21 of the opening 22 are located on the side of the metal strip 1 away from the battery cell assembly 20 .

[0092] The provision of opening 22 facilitates the mating of first insulating layer 2 with metal strip 1 through opening 22, thus reducing the difficulty of installing metal strip 1 and first insulating layer 2. Furthermore, opening 22 is located on the side of metal strip 1 facing away from battery cell 201, thereby enhancing the insulation effect of first insulating layer 2 on metal strip 1 and battery cell assembly 20, reducing material usage for first insulating layer 2 and lowering the manufacturing cost of binding member 10.

[0093] In some embodiments, referring to FIG. 5 , the metal strip 1 has a first surface 11 facing the battery cell assembly 20, and the first insulating layer 2 covers the portion of the first surface 11 opposite the battery cell 201. The metal strip 1 has a first end 13 and a second end 14 opposite each other along the width of the metal strip 1. The first insulating layer 2 protrudes beyond the first end 13 and the second end 14 along the width of the metal strip 1.

[0094] The first insulating layer 2 may cover the entire first surface 11 along the thickness direction of the metal strip 1 within the cross section of the binding member 10. The first surface 11 is the inner surface of the metal strip 1. The first surface 11 may have a facing portion facing the battery cell 201 and a transition portion connecting the facing portion with the first end 13 or connecting the facing portion with the second end 14. The facing portion is the portion of the first surface 11 that faces the battery cell 201, and the first insulating layer 2 covers the facing portion. The first insulating layer 2 may or may not cover the transition portion.

[0095] The first insulating layer 2 protrudes from the first end 13 along a direction from the second end 14 to the first end 13 , and the first insulating layer 2 protrudes from the second end 14 along a direction from the first end 13 to the second end 14 .

[0096] In this embodiment, the portion of the first insulating layer 2 protruding from the metal strip 1 along the width direction of the metal strip 1 can increase the creepage distance between the battery cell 201 and the metal strip 1, and can further reduce the risk of insulation failure between the metal strip 1 and the battery cell 201.

[0097] 5 , the metal strip 1 has a second surface 12 facing away from the battery cell assembly 20 ; the first insulating layer 2 has two ends oppositely disposed along the width direction of the metal strip 1 , both ends being located on the second surface 12 .

[0098] The first surface 11 and the second surface 12 are two surfaces opposite to each other in the thickness direction of the metal strip 1. The second surface 12 is the outer surface of the metal strip 1. The first insulating layer 2 wraps around the first surface 11, the first end 13 and the second end 14, and extends onto the second surface 12.

[0099] In this embodiment, on the one hand, the connection between the first insulating layer 2 and the metal strip 1 is more stable, reducing the risk of the first insulating layer 2 falling off the metal strip 1; on the other hand, the first insulating layer 2 increases the creepage distance between the battery cell 201 and the metal strip 1, reducing the risk of insulation failure between the metal strip 1 and the battery cell 201.

[0100] In some embodiments, please refer to Figure 6, which is a schematic structural diagram of a binding member 10 provided in some other embodiments of the present application. In the cross section of the binding member 10, the first insulating layer 2 is a closed structure extending along the circumference of the metal strip 1, and the cross section is perpendicular to the extension direction of the binding member 10.

[0101] It can be understood that the first insulating layer 2 covers the entire metal strip 1, so that in the cross section of each binding piece 10, the first insulating layer 2 can cover the entire metal strip 1, so that the first insulating layer 2 forms a closed structure extending circumferentially along the metal strip 1 in the cross section.

[0102] By setting the first insulating layer 2 as a closed structure extending along the circumference of the metal strip 1, the insulation effect of the first insulating layer 2 on the metal strip 1 can be improved, the risk of insulation failure of the metal strip 1 and other components can be reduced, and the reliability of the battery device 100 can be improved.

[0103] In some embodiments, please refer to FIG7 , which is a schematic structural diagram of a binding member 10 provided in some embodiments of the present application (showing an insulating tape 25 ). The first insulating layer 2 is an insulating tape 25 wrapped around the metal tape 1 .

[0104] The insulating tape 25 can be wrapped around only a portion of the metal strip 1. For example, if the battery cell assembly 20 includes a plurality of battery cells 201 arranged along a first direction X, and the binding member 10 includes a first portion extending along the first direction X, the insulating tape 25 can be wrapped around only the entire metal strip 1 located in the first portion. For another example, the insulating tape 25 can be spirally wrapped around the metal strip 1, forming a first wrapping area and a second wrapping area on the side of the metal strip 1 facing away from the battery cell assembly 20. The first wrapping area and the second wrapping area are spaced apart, so that the insulating tape 25 wraps around only a portion of the metal strip 1. Alternatively, the insulating tape 25 can be wrapped around the entire metal strip 1 to completely cover the metal strip 1. The insulating tape 25 can partially or completely overlap.

[0105] In this embodiment, by providing the first insulating layer 2 as an insulating tape 25 wound around the metal tape 1 , installation of the insulating tape 25 is facilitated, and difficulty in assembling the insulating tape 25 and the metal tape 1 is reduced.

[0106] In some embodiments, the positive active material of the positive electrode sheet of the battery cell 201 includes lithium phosphate, and the material damage temperature of the first insulating layer 2 is 250° C.-400° C.

[0107] The positive electrode active material may include at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0108] The material damage temperature of the first insulating layer 2 can be any one of 250℃, 260℃, 270℃, 280℃, 290℃, 300℃, 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, 380℃, 390℃, 400℃, 410℃, 420℃, 430℃, 440℃, 450℃, 460℃, 470℃, 480℃, 490℃, and 500℃, or a range value between any two of them.

[0109] In this embodiment, when a battery cell 201 whose positive electrode active material is lithium phosphate undergoes thermal runaway, the first insulating layer 2 can withstand the high temperature generated by the thermal runaway, thereby reducing the risk of the first insulating layer 2 being damaged and causing a lap short circuit between the metal strip 1 and the battery cell 201.

[0110] In some embodiments, the positive active material of the positive electrode sheet of the battery cell 201 includes Li a Ni b Co c M d O e A f , wherein, 0<a≤1.2; 0<b<1; 0<c<1; 0<d<1; 1≤e≤2; 0≤f≤1; M includes but is not limited to one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B; A includes but is not limited to one or more of N, F, S and Cl; the material damage temperature of the first insulating layer 2 is greater than or equal to 400°C.

[0111] The positive electrode active material may include, for example, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) at least one.

[0112] The material damage temperature of the first insulating layer 2 can be 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1200°C, 1300°C, 1250°C, 1500°C, 1600°C, 1700°C, 1800°C, 2000°C, etc.

[0113] In this embodiment, the first insulating layer 2 has higher heat resistance. When the battery cell 201 thermally runs away, the first insulating layer 2 can withstand high temperatures below 400°C, thereby improving the heat resistance of the first insulating layer 2 and making the first insulating layer 2 have better insulation effect, thereby reducing the risk of overlap short circuit between the battery cell 201 and the metal strip 1.

[0114] In some embodiments, the material of the first insulating layer 2 is at least one of ceramic, mica, polyimide, and polytetrafluoroethylene.

[0115] The material of the first insulating layer 2 can be one of ceramic, mica, polyimide or polytetrafluoroethylene. For example, the material of the first insulating layer 2 is ceramic, and the melting point of the first insulating layer 2 is greater than 250°C; it can also be a combination of multiple ones of ceramic, mica, polyimide and polytetrafluoroethylene. For example, the first insulating layer 2 is a combination of polyimide and polytetrafluoroethylene, and the polyimide is coated with polytetrafluoroethylene. The thermal damage temperature of the first insulating layer 2 is greater than or equal to 250°C.

[0116] By manufacturing the first insulating layer 2 from ceramic, mica, polyimide and polytetrafluoroethylene, it is possible to take into account both the insulating performance and the heat resistance of the first insulating layer 2, thereby improving the insulating effect of the first insulating layer 2 on the metal strip 1 and the battery cell assembly 20, and reducing the risk of the first insulating layer 2 being damaged and causing insulation failure at high temperatures.

[0117] In some embodiments, referring to Figures 8-10, Figure 8 is a schematic diagram of the structure of a battery device 100 provided in some other embodiments of the present application; Figure 9 is a schematic diagram of the structure of a battery device 100 provided in some other embodiments of the present application; and Figure 10 is a schematic diagram of the structure of a battery device 100 provided in some other embodiments of the present application. The first insulating layer 2 includes a stacked main layer 23 and a heat-resistant layer 24. The heat-resistant layer 24 is provided on the side of the main layer 23 facing away from the metal strip 1.

[0118] The main layer 23 is closer to the metal strip 1 than the heat-resistant layer 24. It is understood that the material damage temperature of the main layer 23 and the heat-resistant layer 24 is greater than or equal to 250°C.

[0119] In this embodiment, the first insulating layer 2 is provided with a main layer 23 and a heat-resistant layer 24 that are stacked, and the heat-resistant layer 24 is provided on the side of the main layer 23 away from the metal strip 1. The heat-resistant layer 24 can enhance the heat resistance of the side of the main layer 23 away from the metal strip 1, thereby reducing the risk of high temperature damage to the first insulating layer 2 of the battery cell assembly 20, thereby reducing the risk of insulation failure of the metal strip 1 and the battery cell assembly 20.

[0120] In some embodiments, please continue to refer to FIG9 . The first insulating layer 2 includes a main body layer 23 and a heat-resistant layer 24 that are stacked. The heat-resistant layer 24 is provided on the side of the main body layer 23 that faces the metal strip 1 .

[0121] The heat-resistant layer 24 is closer to the metal strip 1 than the main body layer 23 .

[0122] In this embodiment, the heat-resistant layer 24 can strengthen the side of the main layer 23 facing the metal strip 1, reducing the risk of high temperature damage to the first insulating layer 2 of the metal strip 1, thereby reducing the risk of insulation failure of the metal strip 1 and the battery cell assembly 20.

[0123] In some embodiments, referring to FIG10 , the first insulating layer 2 includes a main layer 23 and a heat-resistant layer 24 stacked together. The heat-resistant layer 24 is disposed on the side of the main layer 23 facing away from the metal strip 1 . The heat-resistant layer 24 is disposed on the side of the main layer 23 facing the metal strip 1 .

[0124] In this embodiment, the heat-resistant layer 24 can enhance the tolerance of the first insulating layer 2 to the high temperatures of the metal strip 1 and the battery cell assembly 20 , thereby reducing the risk of insulation failure of the metal strip 1 and the battery cell assembly 20 .

[0125] In some embodiments, the material of the heat-resistant layer 24 is ceramic silicone rubber.

[0126] Ceramic silicone rubber is a composite material of ceramic and silicone rubber. The melting point of ceramic silicone rubber is greater than 250°C, and ceramic silicone rubber has good insulation properties.

[0127] In some embodiments, the material of the main body layer 23 is glass fiber cloth. Glass fiber cloth is a composite material of glass fiber and resin matrix. The melting point of glass fiber cloth is greater than 250° C., and the glass fiber cloth also has good insulation properties.

[0128] In some embodiments, the heat-resistant layer 24 is made of ceramic silicone rubber, and the main body layer 23 is made of fiberglass cloth.

[0129] By setting the material of the heat-resistant layer 24 to ceramic silicone rubber, the insulation performance and heat resistance between the metal belt 1 and the battery cell assembly 20 can be enhanced; by setting the material of the main layer 23 to glass fiber cloth, the glass fiber cloth can improve the insulation performance of the first insulating layer 2, and the glass fiber cloth serves as a carrier of the heat-resistant layer 24, making the setting of the heat-resistant layer 24 more stable. The glass fiber cloth can also provide good toughness for the first insulating layer 2, reducing the risk of the first insulating layer 2 being damaged.

[0130] In some embodiments, please continue to refer to Figure 10. The thickness of the first insulating layer 2 is 0.15 mm-1 mm.

[0131] The thickness of the first insulating layer 2 is the maximum thickness of the first insulating layer 2 coated on the outer surface of the metal strip 1. In the embodiment where the first insulating layer 2 is an insulating tape 25, portions of the insulating tape 25 overlap, and the thickness of the first insulating layer 2 is the thickness of the non-overlapping portion of the insulating tape 25. The thickness of the first insulating layer 2 is H, which can be any one of 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm, or a range of values ​​therebetween.

[0132] When the thickness of the first insulating layer 2 is greater than or equal to 0.15 mm, the insulation performance of the first insulating layer 2 can be improved, reducing the risk of insulation failure between the battery cell assembly 20 and the metal strip 1. When the thickness of the first insulating layer 2 is less than or equal to 1 mm, the size of the bundle 10 can be reduced, reducing the space occupied by the bundle 10 within the battery cell assembly 20, thereby improving the volumetric energy density of the battery device 100. Therefore, when the thickness of the first insulating layer 2 is between 0.15 mm and 1 mm, it is possible to achieve both improved insulation performance of the first insulating layer 2 and reduced size of the bundle 10, thereby reducing the risk of insulation failure between the battery cell assembly 20 and the metal strip 1 and improving the volumetric energy density of the battery device 100. Furthermore, when the thickness of the first insulating layer 2 is less than or equal to 1 mm, the risk of cracking of the first insulating layer 2 when the bundle 10 is bent can be reduced, thereby reducing the risk of insulation failure between the battery cell assembly 20 and the metal strip 1.

[0133] In some embodiments, the thickness of the first insulating layer 2 is 0.15 mm-0.5 mm.

[0134] H can be any one of 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, and 0.5mm, or a range value between any two of them.

[0135] When the thickness of the first insulating layer 2 is less than or equal to 0.5 mm, the size of the binding member 10 can be further reduced, reducing the space occupied by the binding member 10 within the battery cell assembly 20, thereby increasing the volumetric energy density of the battery device 100. Therefore, when the thickness of the first insulating layer 2 is between 0.15 mm and 0.5 mm, the insulation performance of the first insulating layer 2 can be further improved, the size of the binding member 10 can be reduced, and the risk of insulation failure between the battery cell assembly 20 and the metal strip 1 can be further reduced, thereby increasing the volumetric energy density of the battery device 100.

[0136] In some embodiments, the first insulating layer 2 is bonded to the metal tape 1 .

[0137] An adhesive layer is further provided between the first insulating layer 2 and the metal strip 1 , and the adhesive layer bonds the first insulating layer 2 and the metal strip 1 .

[0138] In this embodiment, the connection between the first insulating layer 2 and the metal strip 1 is more stable, thereby improving the structural stability of the binding member 10 .

[0139] In some embodiments, please refer to FIG11 , which is a schematic structural diagram of a binding member 10 provided in some embodiments of the present application. The binding member 10 further includes a second insulating layer 3 , which covers at least a portion of the outer surface of the first insulating layer 2 .

[0140] In an embodiment where the first insulating layer 2 is a closed structure extending circumferentially along the metal strip 1 in cross section, the second insulating layer 3 may cover only a portion of the outer surface of the first insulating layer 2 ; or the second insulating layer 3 may cover the entire outer surface of the first insulating layer 2 .

[0141] In the embodiment where the first insulating layer 2 forms an opening 22 in the cross section, the second insulating layer 3 may only cover a portion of the outer surface of the first insulating layer 2; the second insulating layer 3 may only cover the entire outer surface of the first insulating layer 2; or the second insulating layer 3 may also cover the outer surface of the first insulating layer 2 and the opening 22.

[0142] In the embodiment where the first insulating layer 2 is an insulating tape 25, the second insulating layer 3 may only cover a portion of the outer surface of the insulating tape 25; or the second insulating layer 3 may only cover the entire outer surface of the insulating tape 25; or part of the metal tape 1 may be exposed from the insulating tape 25, and the second insulating layer 3 may cover the part of the metal tape 1 exposed from the insulating tape 25.

[0143] In this embodiment, the first insulating layer 2 can further enhance the insulation effect of the metal strip 1 and the battery cell assembly 20 , and the second insulating layer 3 can also constrain the position of the first insulating layer 2 and enhance the structural stability of the first insulating layer 2 .

[0144] In some embodiments, the second insulating layer 3 is a tubular member, and the metal strip 1 and the first insulating layer 2 are both located inside the tubular member.

[0145] The metal strip 1 is located in the tubular member, which covers the entire metal strip 1. The first insulating layer 2 is located in the tubular member, and may cover the entire metal strip 1 or only a portion of the metal strip 1.

[0146] By providing the second insulating layer 3 as a tubular member, the installation of the second insulating layer 3 is facilitated, and it is also beneficial to fix the first insulating layer 2 on the outer surface of the metal strip 1.

[0147] In some embodiments, the second insulating layer 3 is a heat shrink tube.

[0148] After being coated on the first insulating layer 2 and the metal strip 1 , the second insulating layer 3 may shrink under heat to stabilize the positions of the first insulating layer 2 and the metal strip 1 .

[0149] In this embodiment, by configuring the second insulating layer 3 as a heat shrink tube, the installation of the second insulating layer 3 is made more convenient, and the assembly cost of the second insulating layer 3 is reduced.

[0150] In some embodiments, the material damage temperature of the first insulating layer 2 is greater than the material damage temperature of the second insulating layer 3 .

[0151] In this embodiment, the first insulating layer 2 can withstand higher temperatures than the second insulating layer 3 . When the second insulating layer 3 is damaged by heat, the first insulating layer 2 can reduce the risk of insulation failure between the battery cell 201 and the metal strip 1 , thereby improving the reliability of the battery device 100 .

[0152] An embodiment of the present application provides an energy storage device, including the battery cell 201 provided by any one of the above embodiments or the battery device 100 provided by any one of the above embodiments, wherein the battery cell 201 is used to provide electrical energy to the energy storage device.

[0153] Continuing to refer to Figures 3, 10, and 11, an embodiment of the present application provides a battery device 100 comprising a battery cell assembly 20 and a plurality of binding members 10. The battery cell assembly 20 comprises a plurality of battery cells 201. The binding member 10 is disposed around the battery cell assembly 20 to bind the plurality of battery cells 201, and the plurality of binding members 10 are disposed at intervals. The binding member 10 comprises a metal strip 1, a first insulating layer 2, and a second insulating layer 3. The first insulating layer 2 covers the entire outer surface of the metal strip 1 and is configured to insulate and separate the metal strip 1 and the battery cells 201. The second insulating layer 3 covers the entire outer surface of the first insulating layer 2. The first insulating layer 2 comprises a main body layer 23 and a heat-resistant layer 24, which are stacked, and the heat-resistant layer 24 is disposed on the side of the main body layer 23 facing away from the metal strip 1. The material damage temperature of the first insulating layer 2 is greater than or equal to 250°C. The thickness of the first insulating layer 2 is 0.2 mm to 0.5 mm. The second insulating layer 3 is a heat shrink tubing.

[0154] By providing a first insulating layer 2 covering at least a portion of the outer surface of the metal strip 1, the first insulating layer 2 insulates the metal strip 1 from the battery cell assembly 20. When the battery device 100 experiences thermal runaway, the binding assembly 10 and the battery cells 201 of the battery cell assembly 20 are exposed to rapidly high temperatures. The first insulating layer 2 maintains insulation between the battery cells 201, reducing the risk of insulation failure in the battery cells 201, leading to short circuits and exacerbating thermal runaway in the battery device 100. By setting the material damage temperature of the first insulating layer 2 to be greater than or equal to 250°C, the risk of melting of the first insulating layer 2 due to high temperatures is reduced, thereby reducing the risk of insulation failure between the metal strip 1 and the battery cell assembly 20, and improving the reliability of the battery device 100. By providing the first insulating layer 2 as a closed structure extending along the circumference of the metal strip 1, the first insulating layer 2's insulation effect on the metal strip 1 is enhanced, reducing the risk of insulation failure between the metal strip 1 and other components, and improving the reliability of the battery device 100. By providing the first insulating layer 2 with a stacked main layer 23 and a heat-resistant layer 24, with the heat-resistant layer 24 provided on the side of the main layer 23 facing away from the metal strip 1, the heat-resistant layer 24 can enhance the heat resistance of the main layer 23 on the side facing away from the metal strip 1, thereby reducing the risk of high temperatures in the battery cell assembly 20 damaging the first insulating layer 2, thereby reducing the risk of insulation failure in the metal strip 1 and the battery cell assembly 20. When the thickness of the first insulating layer 2 is between 0.2 mm and 0.5 mm, the insulation performance of the first insulating layer 2 can be further improved and the size of the binding member 10 can be reduced, thereby further reducing the risk of insulation failure in the battery cell assembly 20 and the metal strip 1 and increasing the volumetric energy density of the battery device 100.

[0155] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery device comprising: A battery cell assembly, comprising a plurality of battery cells; a binding member disposed around the battery cell assembly to bind the plurality of battery cells, the binding member comprising a metal strip and a first insulating layer, the first insulating layer covering at least a portion of an outer surface of the metal strip, the first insulating layer being configured to insulate and isolate the metal strip from the battery cells; Wherein, the material damage temperature of the first insulating layer is greater than or equal to 250°C.

2. The battery device according to claim 1, wherein In a cross section of the binding piece, the first insulating layer is a non-enclosed structure extending along the circumference of the metal strip, and the cross section is perpendicular to the extending direction of the binding piece.

3. The battery device according to claim 2, wherein: In the cross section of the binding member, an opening is formed between two ends of the first insulating layer, and the opening is located on a side of the metal strip facing away from the battery cell assembly.

4. The battery device according to claim 1, wherein In a cross section of the binding piece, the first insulating layer is a closed structure extending along the circumference of the metal strip, and the cross section is perpendicular to the extending direction of the binding piece.

5. The battery device according to any one of claims 1 to 4, wherein: The metal strip has a first surface facing the battery cell assembly, and the first insulating layer covers the portion of the first surface opposite to the battery cell; the metal strip has a first end and a second end opposite to each other along the width direction of the metal strip, and the first insulating layer protrudes from the first end and the second end along the width direction of the metal strip.

6. The battery device according to claim 5, wherein: The metal strip has a second surface facing away from the battery cell assembly; The first insulating layer has two end portions that are opposite to each other along the width direction of the metal strip, and both of the end portions are located on the second surface.

7. The battery device according to claim 1, wherein: The first insulating layer is an insulating tape wrapped around the metal tape.

8. The battery device according to any one of claims 1 to 7, wherein: The positive active material of the positive electrode plate of the battery cell includes lithium iron phosphate, and the material damage temperature of the first insulating layer is 250° C.-500° C.

9. The battery device according to any one of claims 1 to 7, wherein: The positive electrode active material of the positive electrode sheet of the battery cell includes Li a Ni b Co c M d O e A f , wherein, 0<a≤1.2; 0<b<1; 0<c<1; 0<d<1; 1≤e≤2; 0≤f≤1; M includes but is not limited to one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B; A includes but is not limited to one or more of N, F, S and Cl; the material damage temperature of the first insulating layer is greater than or equal to 400℃.

10. The battery device according to any one of claims 1 to 7, wherein: The material of the first insulating layer is at least one of ceramic, mica, polyimide and polytetrafluoroethylene.

11. The battery device according to any one of claims 1 to 10, wherein: The first insulating layer includes a main body layer and a heat-resistant layer stacked together; The heat-resistant layer is provided on a side of the main body layer facing away from the metal strip; and / or the heat-resistant layer is provided on a side of the main body layer facing the metal strip.

12. The battery device according to claim 11, wherein: The material of the heat-resistant layer is ceramic silicone rubber; and / or the material of the main body layer is glass fiber cloth.

13. The battery device according to any one of claims 1 to 12, wherein: The thickness of the first insulating layer is 0.15 mm-1 mm.

14. The battery device according to claim 13, wherein: The thickness of the first insulating layer is 0.15 mm-0.5 mm.

15. The battery device according to any one of claims 1 to 14, wherein: The first insulating layer is bonded to the metal tape.

16. The battery device according to any one of claims 1 to 15, wherein: The binding member further includes a second insulating layer covering at least a portion of an outer surface of the first insulating layer.

17. The battery device according to claim 16, wherein: The second insulating layer is a tubular member, and the metal strip and the first insulating layer are both located inside the tubular member.

18. The battery device according to claim 17, wherein: The second insulating layer is a heat shrink tube.

19. The battery device according to any one of claims 16 to 18, wherein: The material damage temperature of the first insulating layer is greater than the material damage temperature of the second insulating layer.

20. An energy storage device comprising the battery device according to any one of claims 1 to 19.

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