Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device and electric equipment.The battery device comprises a plurality of battery packs, the battery packs are sequentially arranged in the first direction, each battery pack comprises a wrapping shell and at least one soft package battery monomer, and the soft package battery monomers are arranged in the wrapping shells; wherein in the plurality of battery packs, a heat insulation piece is arranged between at least two adjacent battery packs. Therefore, by arranging the heat insulation part between at least two adjacent battery packs, the heat transfer among a plurality of battery packs can be improved, and the high-pressure gas fire flow can be buffered through the heat insulation part, so that the spreading speed of thermal runaway among the battery packs can be reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery device and electrical equipment. Background Art

[0002] In the related art, there is a problem of high difficulty in thermal protection between adjacent battery packs of the soft-pack battery device, which affects the further improvement of the reliability of the soft-pack battery device. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery device and an electrical device, wherein the battery device has higher reliability.

[0004] In a first aspect, the present application proposes a battery device, comprising: a plurality of battery packs, the battery packs being arranged in sequence along a first direction, the battery packs comprising a covering shell and at least one soft-pack battery cell, the soft-pack battery cell being arranged in the covering shell; wherein, among the plurality of battery packs, a heat insulating member is arranged between at least two adjacent battery packs.

[0005] According to the battery device of the embodiment of the present application, by arranging a thermal insulation member between at least two adjacent battery groups, the heat transfer between the multiple battery groups can be improved, and the high-pressure gas fire flow can be buffered by the thermal insulation member, thereby reducing the thermal runaway propagation speed between the battery groups and improving the reliability of the battery device.

[0006] According to some embodiments of the present application, a heat insulating member is provided between any two adjacent battery packs.

[0007] In the above technical solution, a greater number of heat insulating components are provided, and heat insulation can be achieved between each pair of adjacent battery packs. The heat insulation and buffer protection effects are better, and the reliability of the battery device can be further improved.

[0008] According to some embodiments of the present application, the thermal insulation member is constructed as any one of a nano thermal insulation material member, a glass fiber thermal insulation material member, and a ceramic fiber thermal insulation material member.

[0009] In the above technical solution, the thermal insulation member is constructed as any one of the above-mentioned thermal insulation materials. On the premise that the thermal insulation member has a stable and reliable thermal insulation effect, a stable and reliable thermal insulation effect can be obtained by using a thermal insulation member with a lower thickness, so as to take into account the energy density of the battery device.

[0010] According to some embodiments of the present application, a thickness dimension of the thermal insulation element in the first direction is 1 mm-4 mm.

[0011] In the above technical scheme, the thickness of the thermal insulation component can be made more reasonable to avoid the thickness of the thermal insulation component being too small, so as to ensure that the thermal insulation effect of the thermal insulation component can meet the thermal insulation requirements, effectively delay the spread of thermal runaway between adjacent battery packs, and reduce the heat diffusion rate. It can also avoid the thickness of the thermal insulation component being too large to reduce the space occupied by the thermal insulation component and take into account the energy density of the battery device.

[0012] According to some embodiments of the present application, the soft-pack battery cell is constructed as a lithium iron phosphate battery; and when the total power inside two adjacent battery packs is less than 0.5 KWh, there is no thermal insulation between the two adjacent battery packs.

[0013] In the above technical solution, there is no need to arrange heat insulating components between adjacent battery packs. On the premise of ensuring the reliability of the battery device, the number of heat insulating components can be reduced to reduce material costs and improve energy density.

[0014] According to some embodiments of the present application, the soft-pack battery cell is constructed as a lithium iron phosphate battery; and when the total power inside the battery pack is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulation member is arranged between the battery pack and the adjacent battery pack, and the thickness of the heat insulation member is 1mm-2mm.

[0015] In the above technical solution, a heat insulating member with a thickness of 1mm-2mm needs to be provided between adjacent battery packs, which can take into account both the reliability and energy density of the battery device.

[0016] According to some embodiments of the present application, the soft-pack battery cell is constructed as a lithium iron phosphate battery; and when the total power inside the battery pack is greater than 1KWh, a heat insulating member is provided between the battery pack and adjacent battery packs, and the thickness of the heat insulating member is 2mm-3mm.

[0017] In the above technical solution, a heat insulating member with a thickness of 2mm-3mm needs to be provided between adjacent battery packs so that the thickness of the heat insulating member is more reasonable to take into account the energy density of the battery device.

[0018] According to some embodiments of the present application, the soft-pack battery cell is constructed as a ternary lithium battery; and when the total power inside two adjacent battery packs is less than 0.5 KWh, there is no thermal insulation between the two adjacent battery packs.

[0019] In the above technical solution, there is no need to arrange heat insulating components between adjacent battery packs. On the premise of ensuring the reliability of the battery device, the number of heat insulating components can be reduced to reduce material costs and improve energy density.

[0020] According to some embodiments of the present application, the soft-pack battery cell is constructed as a ternary lithium battery; and when the total power inside the battery pack is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulation member is arranged between the battery pack and the adjacent battery pack, and the thickness of the heat insulation member is 2mm-3mm.

[0021] In the above technical solution, a heat insulating member with a thickness of 2mm-3mm needs to be provided between adjacent battery packs, which can take into account both the reliability and energy density of the battery device.

[0022] According to some embodiments of the present application, the soft-pack battery cell is constructed as a ternary lithium battery; and when the total power inside the battery pack is greater than 1KWh, a heat insulating member is arranged between the battery pack and the adjacent battery packs, and the thickness of the heat insulating member is 3mm-4mm.

[0023] In the above technical solution, a heat insulating member with a thickness of 3mm-4mm needs to be provided between adjacent battery packs so that the thickness of the heat insulating member is more reasonable to take into account the energy density of the battery device.

[0024] In the above technical scheme, on the one hand, different thicknesses of thermal insulation can be set for battery cells of different energy systems to make the reliability of battery devices of different energy systems higher. On the other hand, for battery cells of the same energy system, as the power in the battery pack increases, the thickness of the thermal insulation also increases accordingly, which can improve the stability of the thermal insulation to ensure the reliability of the battery device, and the thickness of the thermal insulation can be reasonably set to take into account the energy density of the battery device.

[0025] According to some embodiments of the present application, the covering shell includes: a first plate and second plates located on both sides of the first plate in the first direction, the second plate is opposite to the soft-pack battery cell in the first direction, and the thermal insulation is connected to the second plate.

[0026] In the above technical solution, the second plate is used to connect with the thermal insulation member, so that the thermal insulation member can be opposite to the side of the soft-pack battery cell, so that the relative area between the thermal insulation member and the soft-pack battery cell is larger, and the thermal insulation effect of the thermal insulation member can be further improved.

[0027] According to some embodiments of the present application, an opening is formed at one end of the second plate facing away from the first plate, and the covering shell is connected to the box body of the battery device through the opening.

[0028] In the above technical solution, the bottom plate of the box is connected to the second side of the soft-pack battery cell through an adhesive layer, and the end surface of the second plate away from the first plate is also connected to the bottom plate to fix the battery pack on the box, thereby improving the fixation stability and reliability of the battery pack.

[0029] According to some embodiments of the present application, the box body has a bottom plate, and the end surface of the second plate away from the first plate is connected to the bottom plate by an adhesive layer.

[0030] In the above technical solution, the end surface of the second plate away from the first plate is connected to the bottom plate through the adhesive layer, which can also improve the connection strength between the covering shell and the box body, and the heat on the covering shell can also be transferred to the cold plate through the adhesive layer, which can improve the heat dissipation efficiency and heat dissipation effect of the battery pack.

[0031] According to some embodiments of the present application, the bottom plate includes a cold plate, and the glue layer is located between the cold plate and the plurality of soft-pack battery cells.

[0032] In the above technical solution, the adhesive layer is constructed as structural adhesive, and the bottom plate constructed as a cold plate, or the bottom plate provided with a cold plate is connected to the soft-pack battery cell. On the premise of achieving stable and reliable fixation of the battery pack in the box, the temperature of the battery pack can also be regulated by the cold plate, so that the battery pack can operate at a suitable temperature, which can improve the working stability and reliability of the battery pack, reduce the probability of overheating of the battery pack, and reduce the probability of thermal runaway of the battery pack, thereby improving the reliability of the battery pack and even the battery device.

[0033] According to some embodiments of the present application, the glue layer includes: a glue layer body and a glue overflow portion, the glue overflow portion is located on the side of the glue layer body facing the multiple soft-pack battery cells, and is located between adjacent soft-pack battery cells, and / or between the soft-pack battery cells and the second plate, and / or between the second plate and the thermal insulation component.

[0034] In the above technical solution, when the structural adhesive is used to connect and fix the soft-pack battery cell and the cold plate, at least part of the adhesive layer overflows between adjacent soft-pack battery cells and / or between the second plate and the soft-pack battery cell, and forms an overflowing adhesive portion. By setting the overflowing adhesive portion, not only the area between the adhesive layer and the soft-pack battery cell, and between the adhesive layer and the second plate can be increased to improve the fixation stability and reliability of the battery pack on the box, but also the gap between adjacent soft-pack battery cells and between the soft-pack battery cell and the second plate can be filled by the overflowing adhesive portion to achieve the limitation of the soft-pack battery cell and the covering shell, reduce the movement of the battery pack in the box, and reduce the movement of the soft-pack battery cell in the covering shell.

[0035] According to some embodiments of the present application, a soft-pack battery cell includes: a flexible shell and an electrode assembly arranged in the flexible shell, the flexible shell having a side surface opposite to the large surface of the electrode assembly and a circumferential surface avoiding the large surface, the side surface and / or the circumferential surface are provided with a weak portion, the covering shell has a pressure relief portion at least partially opposite to the weak portion, and the pressure relief portion is formed on the first plate.

[0036] In the above technical solution, by providing a pressure relief portion that cooperates with the weak portion on the covering shell, when thermal runaway occurs in the soft-pack battery cell, the high-temperature gas and fire flow discharged through the weak portion can be further released outward through the pressure relief portion, so that the high-temperature gas and fire flow can be directional discharged through the cooperation between the weak portion and the pressure relief portion, thereby improving the reliability of the battery device.

[0037] According to some embodiments of the present application, when projected along the first direction, the projection outline of the soft-pack battery cell is located within the projection outline range of the thermal insulation component.

[0038] In the above technical solution, the outline size of the thermal insulation member is greater than or equal to the outline size of the soft-pack battery cell to improve the thermal insulation effect of the thermal insulation member.

[0039] According to some embodiments of the present application, the thermal insulation member is constructed as one or more of a mica board, a foam board, and an aerogel board.

[0040] According to some embodiments of the present application, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell and a solid-state battery cell.

[0041] In the above technical scheme, in the embodiment where the present application is constructed as a lithium iron phosphate battery cell, the reliability of the soft-pack battery cell can be improved and the cycle life of the soft-pack battery cell can be extended. In the embodiment where the present application is constructed as a ternary lithium battery cell, the energy density of the soft-pack battery cell can be improved and the cruising range can be improved. In the embodiment where the present application is constructed as a solid-state soft-pack battery cell, not only the energy density can be improved, but also the reliability can be improved.

[0042] In a second aspect, the present application proposes an electrical device, including: the battery device in the above embodiment.

[0043] According to some embodiments of the present application, the electrical device is a vehicle.

[0044] In the above technical solution, the electrical equipment is constructed as a vehicle, and the battery device has a higher energy density and higher reliability, which can improve the vehicle's driving reliability while increasing the vehicle's cruising range.

[0045] According to some embodiments of the present application, the battery device is integrated into the chassis of the vehicle, and the top plate of the box body participates in defining the vehicle body floor.

[0046] In the above technical solution, the electrical equipment can be a vehicle, and the battery device can be integrated on the chassis of the vehicle, that is, the body structure is a split body, the upper body and the integrated intelligent chassis are assembled, and the battery device forms a part of the integrated intelligent chassis, so that the top plate of the box can also participate in defining the body floor, which can save meaningless multi-layer plate stacking, reduce material costs, and make the space occupancy of the chassis more reasonable. The space inside the chassis for accommodating the battery device is larger and the energy density is higher.

[0047] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0049] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0050] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0051] Figure 3 is a schematic diagram of a battery pack and a heat insulating member according to an embodiment of the present application (a heat insulating member is provided between adjacent battery packs);

[0052] Figure 4 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0053] Figure 5 is a schematic diagram of the cooperation between the battery pack and the base plate according to an embodiment of the present application;

[0054] Figure 6 is a schematic diagram of a soft-pack battery cell according to an embodiment of the present application;

[0055] Figure 7 is a schematic diagram of a battery pack and a heat insulating member according to an embodiment of the present application (there is one heat insulating member);

[0056] Figure 8 It is a schematic diagram of a battery pack and a heat insulating member according to an embodiment of the present application (a heat insulating member is provided between two battery packs).

[0057] Reference numerals:

[0058] The battery device 100,

[0059] Battery pack 10, covering shell 11, first plate 111, pressure relief portion 1111, second plate 112, soft-pack battery cell 12, flexible shell 121, side surface 1211, circumferential surface 1212, weak portion 1213, electrode assembly 122,

[0060] Thermal insulation 20,

[0061] Box body 30, bottom plate 31, glue layer 32, glue layer body 321, overflow glue portion 322,

[0062] Electrical equipment 200, motor 300, controller 400,

[0063] Exhaust channel a,

[0064] The first direction X. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0067] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0070] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0073] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0074] The term “plurality” used in this application refers to two or more (including two).

[0075] The soft-pack battery cell may be a secondary battery, which refers to a soft-pack battery cell that can be continuously used by activating the active material by charging after the soft-pack battery cell is discharged.

[0076] The soft-pack battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0077] The battery device mentioned in the embodiments of the present application may include one or more battery packs for providing voltage and capacity. The battery pack may include a plurality of soft-pack battery cells, which are connected in series, in parallel or in hybrid connection through a busbar.

[0078] In some embodiments, a battery pack is generally formed by arranging a plurality of soft-pack battery cells.

[0079] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery packs, wherein the battery packs are accommodated in the case.

[0080] As an example, the battery pack may be a battery module, and the battery pack may be accommodated in the box by fixing the battery module in the box.

[0081] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery pack. The closed space here means covered or closed, which may be sealed or unsealed. The first box may be a top cover or a bottom plate.

[0082] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery pack.

[0083] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0084] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical equipment using the battery devices.

[0085] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0086] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0087] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head, or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle.

[0088] The vehicle may further include a controller 400 and a motor 300 . The controller 400 is used to control the battery device 100 to supply power to the motor 300 . The motor 300 serves as a load, for example, to meet the power requirements of starting, navigating and driving the vehicle.

[0089] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0090] Please refer to Figure 2 and Figure 6 , Figure 2 The exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 30, and the box body 30 is used to accommodate the soft-pack battery cell 12.

[0091] Among them, the box body 30 is a component for accommodating the soft-pack battery cell 12, and the box body 30 provides a placement space for the battery pack 10. The box body 30 can adopt a variety of structures. In some embodiments, the box body 30 may include a tray and a cover plate, and the tray and the cover plate cover each other to define a placement space for accommodating the soft-pack battery cell 12. The tray and the cover plate can be in a variety of shapes, such as a rectangular parallelepiped, a cylinder, etc. The tray can be a hollow structure with one side open, and the cover plate can also be a hollow structure with one side open, and the open side of the cover plate covers the open side of the tray, thereby forming a box body 30 with a placement space. It is also possible that the tray is a hollow structure with one side open, and the cover plate is a plate-like structure, and the cover plate covers the open side of the tray, thereby forming a box body 30 with a placement space.

[0092] In the battery device 100, there may be one or more soft-pack battery cells 12. Multiple soft-pack battery cells 12 are loaded into a battery pack 10 through the covering shell 11, and one or more battery packs 10 are loaded into the box 30. If there are multiple soft-pack battery cells 12, the multiple soft-pack battery cells 12 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple soft-pack battery cells 12 are both connected in series and in parallel. Multiple soft-pack battery cells 12 may be connected in series, in parallel, or in mixed connection to form a battery pack 10, and multiple battery packs 10 may be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 30.

[0093] Combination Figure 4 , Figure 5 as well as Figure 6 The soft-pack battery cell 12 is a minimum energy unit of the battery device 100 . The soft-pack battery cell 12 includes a flexible shell 121 and an electrode assembly 122 disposed in the flexible shell 121 .

[0094] The internal environment formed by the flexible housing 121 can be used to accommodate the electrode assembly 122, electrolyte and other components. An opening can be formed on one side of the flexible housing 121 for injecting electrolyte and the electrode assembly 122 into the housing.

[0095] The tabs of the electrode assembly 122 pass through the flexible housing 121, and the tabs are electrically connected to the busbar. The electrode assembly 122 is a component where an electrochemical reaction occurs in the soft-pack battery cell 12. One or more electrode assemblies 122 may be contained in the flexible housing 121. The electrode assembly 122 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 122, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery device 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the busbar to form a current loop.

[0096] The positive electrode sheet may include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer includes a positive electrode active material.

[0097] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0098] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, when the soft-pack battery cell 12 of the embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell 12. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0100] Examples of phosphates include, but are not limited to, lithium iron phosphate (e.g., LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4), at least one of a composite material of lithium manganese phosphate and carbon, a composite material of lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0101] Layered transition metal oxides include Li a Ni b Co c M d O e A f At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0102] Examples of layered transition metal oxides include, but are not limited to, lithium cobalt oxides (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 )、LiNi 0.9 Co 0.05 Mn 0.05 O 2(also referred to as Ni90)), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0103] When the soft-pack battery cell 12 of the embodiment of the present application is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0104] As an example, a positive electrode active material for a sodium ion battery may include NaFeO 2 、NaCoO 2 、NaCrO 2 、NaMnO 2 、NaNiO 2 、NaNi 1 / 2 Ti 1 / 2 O 2 、NaNi 1 / 2 Mn 1 / 2 O 2 、Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O 2 、NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 、NaFePO 4 、NaMnPO 4 、NaCoPO 4 , Prussian blue materials, general formula X p M' q (PO 4 ) r O x Y 3-x In the general formula X p M' q (PO 4 ) r O x Y 3-x , 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0105] In the embodiments of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0106] The soft-pack battery cell 12 is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process. The molar content of Li is different when the soft-pack battery cell 12 is discharged to different states. In the examples of the positive electrode active materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after charge and discharge cycles.

[0107] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. In reality, the molar content of oxygen O will fluctuate.

[0108] In the embodiments of the present application, the content of the elements in the positive electrode active material has a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180°C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0109] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam, etc. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0110] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0111] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0112] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0113] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0114] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0115] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy or foamed carbon, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0116] As an example, the negative electrode active material may adopt the negative electrode active material for the soft-pack battery cell 12 known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0117] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, such as a silicon-based material that may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can increase the energy density of the soft-pack battery cell 12.

[0118] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. In the soft-pack battery cell 12 system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery cell 12 can be improved.

[0119] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0120] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0121] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0122] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0123] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0124] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0125] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0126] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0127] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0128] The porous base membrane may include one or more of polyethylene and polypropylene.

[0129] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0130] In some embodiments, the inorganic particles include boehmite γ-AlOOH, alumina Al 2 O 3 、Aluminum hydroxide Al(OH) 3 、Barium sulfate BaSO 4 , magnesium oxide MgO, magnesium hydroxide Mg(OH) 2 , calcium oxide CaO, cerium oxide CeO 2 、Zirconium titanate SrTiO 3 , barium titanate BaTiO 3 and magnesium fluoride MgF 2 One or more of .

[0131] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0132] In some embodiments, the soft pack battery cell 12 further includes an electrolyte.

[0133] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. The present application embodiment has no particular limitation on the type of electrolyte, which can be selected according to actual needs.

[0134] The electrolyte includes electrolyte salt and solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0135] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0136] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0137] In the related art, the covering shell 11 is arranged outside a plurality of soft-pack battery cells 12 and is used to support the soft-pack battery cells 12, and a plurality of battery packs 10 are arranged sequentially in the length direction and / or width direction of the battery device 100, and the intervals between adjacent battery packs 10 are small, resulting in a faster heat diffusion rate between adjacent battery packs 10, posing a safety hazard.

[0138] Based on this, the present application proposes a battery device 100, which achieves isolation and protection between adjacent battery groups 10 by setting a thermal insulation member 20 between adjacent battery groups 10, thereby reducing the thermal runaway propagation speed between adjacent battery groups 10 and improving the reliability of the battery device 100.

[0139] Reference below Figure 1-Figure 8 A battery device 100 and a power-consuming device 200 according to an embodiment of the present invention are described.

[0140] like Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 As shown, the present application proposes a battery device 100, comprising: a plurality of battery packs 10, the battery packs 10 are arranged in sequence along a first direction, the battery pack 10 comprises a covering shell 11 and at least one soft-pack battery cell 12, the soft-pack battery cell 12 is arranged in the covering shell 11, and among the plurality of battery packs 10, a heat insulating member 20 is arranged between at least two adjacent battery packs 10.

[0141] Specifically, multiple battery packs 10 can be arranged in sequence in the box body 30 along a first direction, and the first direction can be the length direction of the battery device 100, and the first direction can also be the width direction of the battery device 100, and a thermal insulation member 20 is arranged between at least two adjacent battery packs 10, so that the heat transfer between the two adjacent battery cells can be blocked by the thermal insulation member 20 through the setting of the thermal insulation member 20, and at the same time, the thermal insulation member 20 can also buffer the high-pressure gas and fire flow (the high-pressure airflow generated by the thermal runaway soft-pack battery cell 12 and entrained solid particles or liquid substances, which is defined as a high-pressure gas and fire flow) to reduce the thermal runaway propagation speed between adjacent battery packs 10.

[0142] It should be pointed out that a thermal insulation member 20 is provided between at least two adjacent battery groups 10, which means that there are three battery groups 10 in the first direction, which are defined as the first group, the second group and the third group respectively, and at least one of the thermal insulation member 20 is provided between the first group and the second group or between the second group and the third group, or both are provided with the thermal insulation member 20.

[0143] like Figure 7As shown, in some embodiments, a heat insulating member 20 may be disposed inside the battery device 100, and the heat insulating member 20 may be disposed between any two adjacent battery packs 10 in the arrangement direction in which the plurality of battery packs 10 are sequentially arranged, such as Figure 3 and 8 As shown, in other embodiments, a plurality of heat insulating members 20 may be disposed inside the battery device 100, and a battery pack 10 may be disposed between adjacent heat insulating members 20 (see Figure 3 ), or two battery packs 10 (see Figure 8 ), of course, there can be more, which will not be described in detail in this application.

[0144] According to the battery device 100 of the embodiment of the present application, by arranging a thermal insulation member 20 between at least two adjacent battery groups 10, the heat transfer between the multiple battery groups 10 can be improved, and the high-pressure gas fire flow can be buffered by the thermal insulation member 20, thereby reducing the thermal runaway propagation speed between the battery groups 10, so as to improve the reliability of the battery device 100.

[0145] In a further embodiment of the present application, Figure 3 As shown, a heat insulating member 20 is provided between any two adjacent battery groups 10. Compared with a heat insulating member 20 being provided between at least two adjacent battery groups 10, a greater number of heat insulating members 20 are provided, and heat isolation can be achieved between each pair of adjacent battery groups 10. The heat isolation and buffer protection effects are better, and the reliability of the battery device 100 can be further improved.

[0146] According to some embodiments of the present application, the thermal insulation member 20 is constructed as any one of a nano thermal insulation material member, a glass fiber thermal insulation material member, and a ceramic fiber thermal insulation material member.

[0147] That is to say, in some embodiments, the thermal insulation component 20 is constructed as a nano-insulation material (insulation material containing nano-particle pores), such as nano-alumina, nano-silicon dioxide, nano-titanium oxide, etc., which can be produced by sol, vapor deposition, combustion and other processes; in other embodiments, the thermal insulation component 20 is constructed as a glass fiber insulation material, which is made of minerals such as talc, quartz sand, limestone, dolomite, borax and magnesia stone through high-temperature melting, wire drawing, winding and weaving processes; in other embodiments, the thermal insulation component is constructed as a ceramic fiber insulation material, which is produced by high-purity clay clinker, alumina powder, silica powder and other raw materials at high temperature in an industrial electric furnace.

[0148] Therefore, the thermal insulation member 20 is constructed as any one of the above-mentioned thermal insulation materials. On the premise that the thermal insulation member 20 has a stable and reliable thermal insulation effect, a stable and reliable thermal insulation effect can be obtained by using a thermal insulation member 20 with a lower thickness, so as to take into account the energy density of the battery device 100.

[0149] According to some embodiments of the present application, the thickness dimension of the thermal insulation element 20 in the first direction is 1 mm-4 mm.

[0150] That is, the thickness of the heat insulating member 20 in the arrangement direction of the battery pack 10 may be 1 mm, 2 mm, 3 mm or 4 mm.

[0151] In this way, the thickness dimension of the thermal insulation 20 can be made more reasonable, avoiding the thickness dimension of the thermal insulation 20 being too small, thereby ensuring that the thermal insulation effect of the thermal insulation 20 can meet the thermal insulation requirements, effectively delaying the spread of thermal runaway between adjacent battery packs 10, and reducing the heat diffusion rate. It can also avoid the thickness dimension of the thermal insulation 20 being too large, thereby reducing the space occupied by the thermal insulation 20 and taking into account the energy density of the battery device 100.

[0152] According to some embodiments of the present application, the soft-pack battery cell 12 is configured as a lithium iron phosphate battery;

[0153] When the total power inside two adjacent battery packs 10 is less than 0.5 KWh, there is no heat insulation member 20 between the two adjacent battery packs 10;

[0154] When the total power inside the battery pack 10 is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulating member 20 is provided between the battery pack 10 and the adjacent battery pack 10, and the thickness of the heat insulating member 20 is 1 mm-2 mm;

[0155] When the total power inside the battery pack 10 is greater than 1 KWh, a heat insulating member 20 is provided between the battery pack 10 and the adjacent battery pack 10 , and the thickness of the heat insulating member 20 is 2 mm-3 mm.

[0156] Specifically, in the embodiment where the soft-pack battery cell 12 is constructed as a lithium iron phosphate battery, and the total power inside the battery pack 10 is less than 0.5 KWh, there is no need to set a thermal insulation member 20 between adjacent battery packs 10. Under the premise of ensuring the reliability of the battery device 100, the number of thermal insulation members 20 can be reduced to reduce material costs and improve energy density. In the embodiment where the soft-pack battery cell 12 is constructed as a lithium iron phosphate battery, and the total power inside the battery pack 10 is less than or equal to 1 KWh, and greater than or equal to 0.5 KWh, a thermal insulation member 20 with a thickness of 1mm-2mm needs to be set between adjacent battery packs 10, which can take into account both the reliability and energy density of the battery device 100. Similarly, in the embodiment where the soft-pack battery cell 12 is constructed as a lithium iron phosphate battery, and the total power inside the battery pack 10 is greater than 1 KWh, a thermal insulation member 20 with a thickness of 2mm-3mm needs to be set between adjacent battery packs 10, so that the thickness of the thermal insulation member 20 is more reasonable to take into account the energy density of the battery device 100.

[0157] According to other embodiments of the present application, the soft-pack battery cell 12 is configured as a ternary lithium battery;

[0158] When the total power inside two adjacent battery packs 10 is less than 0.5 KWh, there is no heat insulation member 20 between the two adjacent battery packs 10;

[0159] When the total power inside the battery pack 10 is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulating member 20 is provided between the battery pack 10 and the adjacent battery pack 10, and the thickness of the heat insulating member 20 is 2 mm-3 mm;

[0160] When the total power inside the battery pack 10 is greater than 1 KWh, a heat insulating member 20 is provided between the battery pack 10 and the adjacent battery pack 10 , and the thickness of the heat insulating member 20 is 3 mm-4 mm.

[0161] Specifically, in the embodiment where the soft-pack battery cell 12 is constructed as a ternary lithium battery and the total power inside the battery pack 10 is less than 0.5 KWh, there is no need to set a thermal insulation member 20 between adjacent battery packs 10. Under the premise of ensuring the reliability of the battery device 100, the number of thermal insulation members 20 can be reduced to reduce material costs and improve energy density. In the embodiment where the soft-pack battery cell 12 is constructed as a ternary lithium battery and the total power inside the battery pack 10 is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a thermal insulation member 20 with a thickness of 2mm-3mm needs to be set between adjacent battery packs 10, which can take into account both the reliability and energy density of the battery device 100. Similarly, in the embodiment where the soft-pack battery cell 12 is constructed as a ternary lithium battery and the total power inside the battery pack 10 is greater than 1 KWh, a thermal insulation member 20 with a thickness of 3mm-4mm needs to be set between adjacent battery packs 10, so that the thickness of the thermal insulation member 20 is more reasonable to take into account the energy density of the battery device 100.

[0162]

[0163] That is to say, compared with traditional square shell battery cells, the soft-pack battery cells 12 have higher grouping efficiency and higher energy density in a single battery pack 10. However, as the number of soft-pack battery cells 12 inside the battery pack 10 increases, it is difficult to achieve heat isolation between adjacent battery packs 10 only by the covering shell 11. Therefore, a heat insulation member 20 is further arranged between adjacent battery packs 10. However, the soft-pack battery cells 12 of different systems have different heat generation when thermal runaway occurs. For example, under the lithium iron phosphate battery system, the heat generation of the soft-pack battery cells 12 when thermal runaway occurs is relatively low, while under the ternary lithium battery system, the heat generation of the soft-pack battery cells 12 when thermal runaway occurs is relatively high. Therefore, under the same power, the thickness of the heat insulation member 20 between the battery packs 10 in the ternary lithium battery system is set thicker, while the thickness of the heat insulation member 20 between the battery packs 10 in the lithium iron phosphate system is set relatively thinner. Under the same battery system, as the power increases, the thickness of the heat insulation member 20 increases reasonably and does not exceed an upper limit value, such as the upper limit value of lithium iron phosphate batteries is 3mm, and the upper limit value of ternary lithium batteries is 4mm.

[0164] It should be pointed out that two battery packs 10 can be arranged in a sealed space of a simulated battery device, the internal electric quantity of the two battery packs 10 is the same, and one of the two battery packs 10 is made to have thermal runaway (e.g., thermal runaway is triggered by short-circuiting), while the other is a battery pack 10 in a normal state, and no heat insulating member 20 is arranged between two adjacent battery packs 10, or heat insulating members 20 of different thicknesses are arranged successively, and based on national standards, the allowable limit of thermal runaway of one battery pack 10 causing thermal runaway of the other battery pack 10 is set. The allowed time threshold (for example, GB38031 national standard requires that the battery device 100 shall not catch fire within five minutes after the battery cell thermal runaway occurs, and the allowed time threshold can be set as 5 minutes based on this) is then judged between adjacent battery groups 10, whether the battery group 10 in a normal state is affected by the spread of thermal runaway, and whether the time taken for the thermal runaway to occur reaches or exceeds the allowed time threshold, so as to determine the thermal protection effect between adjacent battery groups 10, so as to determine whether the thermal insulation member 20 needs to be set for battery groups 10 with different capacities, and if the thermal insulation member 20 needs to be set, further determine the thickness of the thermal insulation member 20 for testing.

[0165] See the table below, which shows the insulation effect comparison table of battery cells with the same specifications and sizes, different energy systems, different total capacities in a single battery pack 10, and different thicknesses of insulation members 20 between adjacent battery packs 10.

[0166]

[0167] It should be pointed out that the test conditions are that a thermal insulation member 20 is set between two adjacent battery packs 10, two battery packs 10 with the same power are selected (such as: 0.5KWh, 1KWh, etc.), and one of the battery packs 10 has thermal runaway, and the other battery pack 10 does not have thermal runaway, and a thermal insulation member 20 is set between the two battery packs 10 or no thermal insulation member 20 is set (such as: measuring the thermal runaway duration under 1.4KWh total power, lithium iron phosphate battery cells, and 1.2mm thickness of thermal insulation), and measuring the duration of thermal runaway of the other battery pack 10, and defining the protection effect based on the allowed time threshold, such as: exceeding the allowed time threshold by 1 minute is defined as excellent protection effect, equal to the allowed time threshold is defined as good protection effect, less than the allowed time threshold by 1 minute is defined as poor, less than the allowed time threshold by 2 minutes is defined as extremely poor, and both poor and extremely poor are characterized as unqualified protection effect.

[0168] It can be seen from the table that in the embodiment where the soft-pack battery cell 12 is constructed as a lithium iron phosphate battery cell, when the total power is below 0.5KWh, there is no need to set the heat insulation 20. When the total power is within the range of 0.5KWh-1KWh, a 1mm-2mm heat insulation 20 can have a good protective effect. When the total power is greater than 1KWh, a heat insulation 20 greater than 2mm needs to be set. In the embodiment where the soft-pack battery cell 12 is constructed as a ternary lithium battery cell, when the total power is below 0.5KWh, there is no need to set the heat insulation 20. When the total power is within the range of 0.5KWh-1KWh, a 1mm-3mm heat insulation 20 can have a good protective effect. When the total power is greater than 1KWh, a heat insulation 20 greater than 3mm needs to be set. In other words, as the total power increases, the thickness of the heat insulation 20 should be adaptively increased.

[0169] In this way, on the one hand, different thicknesses of the thermal insulation member 20 can be set for battery cells of different energy systems to make the reliability of battery devices 100 of different energy systems higher. On the other hand, for battery cells of the same energy system, as the power in the battery pack 10 increases, the thickness of the thermal insulation member 20 also increases accordingly, which can improve the stability of the thermal insulation member 20 to ensure the reliability of the battery device 100, and the thickness of the thermal insulation member 20 can be reasonably set to take into account the energy density of the battery device 100.

[0170] like Figure 2 As shown, the present application provides a battery device 100, including: a box body 30 and a battery pack 10, and there is at least one battery pack 10.

[0171] The battery pack 10 includes: at least one soft-pack battery cell 12 in the above embodiment and a covering shell 11 , and at least one side surface of the covering shell 11 has a pressure relief portion 1111 .

[0172] Among them, a accommodating space is formed in the box body 30, and one or more battery packs 10 are arranged in the accommodating space. One or more soft-pack battery cells 12 are arranged inside the covering shell 11 of each battery pack 10, and the soft-pack battery cells 12 are constructed as the above-mentioned soft-pack battery cells 12 using the flexible shell 121.

[0173] The covering shell 11 is at least used to cover at least one of the multiple circumferential surfaces 1212 and two side surfaces 1211 of the soft-pack battery cell 12, and a weak portion 1213 is provided on at least one circumferential surface 1212 of the soft-pack battery cell 12, and a pressure relief portion 1111 is formed on at least one side of the covering shell 11, such as the pressure relief portion 1111 is opposite to the weak portion 1213, or the pressure relief portion 1111 is located on the first surface of the covering shell 11, and the weak portion 1213 is opposite to the second surface of the covering shell 11, and the first surface is adjacent to the second surface.

[0174] According to the battery device 100 of the embodiment of the present application, by providing a pressure relief portion 1111 that cooperates with the weak portion 1213 on the covering shell 11, when the soft-pack battery cell 12 has thermal runaway, the high-temperature gas and fire flow discharged through the weak portion 1213 can be further released outward through the pressure relief portion 1111, so as to achieve directional discharge of the high-temperature gas and fire flow through the cooperation between the weak portion 1213 and the pressure relief portion 1111, thereby improving the reliability of the battery device 100.

[0175] According to some embodiments of the present application, the covering shell 11 includes a first plate 111 and second plates 112 located on both sides of the first plate 111 . A pressure relief portion 1111 is formed on the first plate 111 , and the weak portion 1213 is at least partially opposite to the pressure relief portion 1111 .

[0176] Specifically, the first plate 111 and the second plates 112 located on both sides of the first plate 111 define a generally U-shaped covering shell 11, so that the first plate 111 of the covering shell 11 can be opposite to a circumferential surface 1212 of the soft-pack battery cell 12, and the two second plates 112 can be opposite to the two side surfaces 1211 of the soft-pack battery cell 12 respectively, and the weak portion 1213 formed on the circumferential surface 1212 can be at least partially opposite to the pressure relief portion 1111 formed on the first plate 111.

[0177] It should be pointed out that the weak portion 1213 is at least partially opposite to the pressure relief portion 1111 , which means that the weak portion 1213 formed on the circumferential surface 1212 is projected toward the first plate 111 , and the projection contour at least partially overlaps with the contour of the pressure relief portion 1111 .

[0178] In this way, on the one hand, the gas and fire flow generated after the thermal runaway of the soft-pack battery cell 12 can be discharged in a direction and orderly to reduce damage, especially secondary damage. On the other hand, the connection path between the weak portion 1213 and the pressure relief portion 1111 is shorter, which can achieve rapid discharge while the gas and fire flow stays in the covering shell 11 for a shorter time, which has less impact on other soft-pack battery cells 12 around the thermal runaway soft-pack battery cell 12, and can further reduce the spread speed of thermal runaway, thereby improving the reliability of the battery pack 10 and the battery device 100.

[0179] According to some embodiments of the present application, the second plate 112 is opposite to the side surface 1211 , and a projection contour area of ​​the second plate 112 toward the side surface 1211 of the flexible housing 121 is smaller than or equal to an area of ​​the side surface 1211 .

[0180] Specifically, the circumferential surface 1212 is defined to include a first surface and a second surface opposite thereto, the first surface is opposite to the first plate 111, the second surface is arranged away from the first plate 111, and the second surface is used to connect to the box body 30, the two sides of the first surface and the second surface are respectively the two side surfaces 1211 of the soft-pack battery cell 12, the two ends of the first surface and the second surface are respectively the other two circumferential surfaces 1212 of the soft-pack battery cell 12, and the second plate 112 is opposite to the side surface 1211, so as to limit the soft-pack battery cell 12 in the direction of the second plate 112, and the area size of the surface of the second plate 112 opposite to the side surface 1211 can be less than or equal to the area size of the side surface 1211.

[0181] That is to say, in some embodiments, the size of the second plate 112 is consistent with the size of the side 1211, and in other embodiments, the size of the second plate 112 is smaller than the size of the side 1211. On the one hand, it can avoid the second plate 112 being too large, which makes the second side unable to connect to the box body 30, and can improve the fixation stability and reliability of the battery pack 10 in the box body 30. On the other hand, the material used for the second plate 112 can be less, and the material cost of the battery pack 10 and the battery device 100 can also be reduced.

[0182] like Figure 3 , Figure 4 and Figure 5 As shown, according to some embodiments of the present application, the covering shell 11 includes: a first plate 111 and a second plate 112 located on both sides of the first plate 111 in the first direction, the second plate 112 is opposite to the soft-pack battery cell 12 in the first direction, and the thermal insulation member 20 is connected to the second plate 112.

[0183] Specifically, the second plate 112 is used to be connected to the thermal insulation member 20, so that the thermal insulation member 20 can be opposite to the side 1211 of the soft-pack battery cell 12, so that the area of ​​the relative area between the thermal insulation member 20 and the soft-pack battery cell 12 is larger, and the thermal insulation effect of the thermal insulation member 20 can be further improved.

[0184] It can be understood that the end surface of the second plate 112 away from the first plate 111 is connected to the bottom plate 31 through the adhesive layer 32, which can also improve the connection strength between the covering shell 11 and the box body 30, and the heat on the covering shell 11 can also be transferred to the cold plate through the adhesive layer 32, which can improve the heat dissipation efficiency and heat dissipation effect of the battery pack 10.

[0185] Combination Figure 3 and Figure 4 As shown, according to some embodiments of the present application, an opening is formed at one end of the second plate 112 away from the first plate 111 , and the covering shell 11 is connected to the box body 30 of the battery device 100 through the opening.

[0186] Specifically, the bottom plate 31 of the box body 30 is connected to the second side of the soft-pack battery cell 12 through the adhesive layer 32, and the end surface of the second plate 112 away from the first plate 111 is also connected to the bottom plate 31 to fix the battery pack 10 on the box body 30, thereby improving the fixing stability and reliability of the battery pack 10.

[0187] Of course, in some embodiments, the adhesive layer 32 is also used to connect and fix the bottom plate 31 and the second plate 112 .

[0188] Combination Figure 5 As shown, according to some embodiments of the present application, the bottom plate 31 includes a cold plate, and the glue layer 32 is located between the cold plate and the plurality of soft-pack battery cells 12 .

[0189] In some embodiments, the bottom plate 31 of the box body 30 is formed as a cold plate, and the cold plate is connected to the soft-pack battery cell 12 through the glue layer 32. In other embodiments, a cold plate is arranged between the bottom plate 31 and the soft-pack battery cell 12, and the cold plate is connected to the soft-pack battery cell 12 through the glue layer 32.

[0190] That is to say, the adhesive layer 32 is constructed as structural adhesive, and the bottom plate 31 provided with a cold plate is connected to the soft-pack battery cell 12. On the premise of achieving stable and reliable fixation of the battery pack 10 in the box body 30, the temperature of the battery pack 10 can also be regulated by the cold plate, so that the battery pack 10 can operate at a suitable temperature, which can improve the working stability and reliability of the battery pack 10, reduce the probability of overheating of the battery pack 10, and reduce the probability of thermal runaway of the battery pack 10, thereby improving the reliability of the battery pack 10 and even the battery device 100.

[0191] like Figure 5As shown, according to some embodiments of the present application, the glue layer 32 includes: a glue layer body 321 and a glue overflow portion 322, the glue overflow portion 322 is located on the side of the glue layer body 321 facing the multiple soft-pack battery cells 12, and is located between adjacent soft-pack battery cells 12, and / or between the soft-pack battery cells 12 and the second plate 112.

[0192] That is to say, when the structural adhesive is used to connect and fix the soft-pack battery cell 12 and the cold plate, at least part of the adhesive layer 32 overflows between adjacent soft-pack battery cells 12 and / or between the second plate 112 and the soft-pack battery cell 12, and forms an overflow adhesive portion 322. By setting the overflow adhesive portion 322, not only the area between the adhesive layer 32 and the soft-pack battery cell 12, and the area between the adhesive layer 32 and the second plate 112 can be increased to improve the fixation stability and reliability of the battery pack 10 on the box 30, but also the gap between adjacent soft-pack battery cells 12 and between the soft-pack battery cell 12 and the second plate 112 can be filled by the overflow adhesive portion 322 to achieve the limitation of the soft-pack battery cell 12 and the covering shell 11, reduce the movement of the battery pack 10 in the box 30, and reduce the movement of the soft-pack battery cell 12 in the covering shell 11.

[0193] According to some embodiments of the present application, when projected along the first direction, the projection outline of the soft-pack battery cell 12 is located within the projection outline range of the thermal insulation member 20 .

[0194] That is to say, the outline size of the heat insulating member 20 is greater than or equal to the outline size of the soft-pack battery cell 12 to improve the heat insulating effect of the heat insulating member 20 .

[0195] like Figure 4 , Figure 5 and Figure 6 As shown, according to some embodiments of the present application, the first plate 111 is spaced apart from one side of the circumferential surface 1212 having the weak portion 1213 to define an exhaust channel a.

[0196] In this way, the high-temperature gas and fire flow generated after the weak part 1213 ruptures can be first discharged to the exhaust channel a, and after preliminary buffering through the exhaust channel a, it can be discharged through the pressure relief part 1111, which can reduce the pressure of the high-temperature gas and fire flow after flowing out of the pressure relief part 1111, so as to reduce the impact and damage of the soft-pack battery cell 12 after thermal runaway.

[0197] According to some embodiments of the present application, the first plate 111 is configured as a straight plate or a curved plate.

[0198] That is, in some embodiments, the first plate 111 is configured as a straight plate, and in other embodiments, the first plate 111 is configured as a curved plate.

[0199] According to some embodiments of the present application, there are multiple pressure relief portions 1111 , and the multiple pressure relief portions 1111 are arranged at intervals in the length direction and / or width direction of the first plate 111 .

[0200] Thus, the multiple weak parts 1213 on each soft-pack battery cell 12 can have a corresponding pressure relief part 1111, so that the high-temperature gas and fire flow buffered by the exhaust channel a can be directly discharged through the corresponding pressure relief part 1111, thereby increasing the discharge speed and reducing the residence time of the high-temperature gas and fire flow in the exhaust channel a during the discharge process, so as to reduce the spread speed of thermal runaway between adjacent soft-pack battery cells 12 in the battery pack 10 and improve the reliability of the battery pack 10.

[0201] According to some embodiments of the present application, the covering shell 11 is constructed as an aluminum shell or a stainless steel shell.

[0202] It can be understood that, in some embodiments, the covering shell 11 is constructed as an aluminum shell, and in other embodiments, the covering shell 11 is constructed as a stainless steel shell, so that the temperature resistance and structural strength of the covering shell 11 are much higher than those of the flexible shell. By using the covering shell 11 with a certain structural strength and rigidity to support and protect the soft-pack battery cell 12 outside the soft-pack battery cell 12, the structural strength of the battery pack 10 can be improved, and the thermal runaway propagation speed between adjacent battery packs 10 can be reduced, thereby improving the reliability of the battery device 100.

[0203] As shown in the accompanying drawings, the soft-pack battery cell 12 of the embodiment of the present application is constructed as a soft-pack battery cell 12, the electrode assembly 122 is arranged in the flexible shell 121, and the flexible shell 121 has a weak portion 1213 formed on at least the circumferential surface 1212. The battery pack 10 includes at least one soft-pack battery cell 12 of the embodiment of the present application, and the pressure relief portion 1111 on the first plate 111 of the covering shell 11 is at least partially opposite to the weak portion 1213, the second plate 112 is opposite to the side 1211 of the flexible shell 121, and the box body 30 is The bottom plate 31 is constructed as a cold plate, or a cold plate is arranged above the bottom plate 31, and the cold plate is connected to the soft-pack battery cell 12 through the glue layer 32, and the overflow glue portion 322 of the glue layer 32 overflows to between adjacent soft-pack battery cells 12, and / or between the soft-pack battery cell 12 and the second plate 112, and a heat insulating member 20 is arranged between adjacent battery packs 10, and the heat insulating member 20 is connected to at least one of the bottom plate 31 and the top plate of the box body 30, and the heat insulating member 20 and the second plate 112 can also be fixed by structural adhesive, screw structure, clamping structure, etc.

[0204] According to some embodiments of the present application, the soft-pack battery cell 12 is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0205] That is, in some embodiments, the soft-pack battery cell 12 is configured as a lithium iron phosphate battery, in some embodiments, the soft-pack battery cell 12 is configured as a ternary lithium battery cell, and in some embodiments, the soft-pack battery cell 12 is configured as a solid-state battery cell.

[0206] The solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell may also be a semi-solid-state battery cell or a fully solid-state battery cell.

[0207] In the above technical scheme, in the embodiment where the present application is constructed as a lithium iron phosphate battery cell, the reliability of the soft-pack battery cell can be improved and the cycle life of the soft-pack battery cell can be extended. In the embodiment where the present application is constructed as a ternary lithium battery cell, the energy density of the soft-pack battery cell can be improved and the cruising range can be improved. In the embodiment where the present application is constructed as a solid-state soft-pack battery cell, not only the energy density can be improved, but also the reliability can be improved.

[0208] According to some embodiments of the present application, when the soft pack battery cell 12 is lithium iron phosphate (LiFeO 4 ) battery cell, in the positive electrode material of the soft-pack battery cell 12, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96: (1-3): (1-3); when the soft-pack battery cell 12 is a ternary lithium battery cell, and in the positive electrode material of the soft-pack battery cell 12, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96: (2-3): (1-2).

[0209] It can be understood that when the soft-pack battery cell 12 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 12, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0210] For example, when the soft-pack battery cell 12 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which can refer to LiFePO 4, that is, lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), the conductive agent can be conductive carbon black, wherein LFP:PVDF:conductive carbon black can be 96:2:2, that is, the total weight of the positive electrode active material is 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit of the positive electrode active material can be grams.

[0211] When the soft-pack battery cell 12 is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 12, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but not limited to nickel cobalt manganese lithium oxide system, nickel cobalt aluminum oxide lithium oxide system, etc.

[0212] For example, the ternary material of the ternary battery cell can be eight series LiNi 0.8 Co 0.1 Mn 0.1 O 2 The weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5. That is to say, the total weight of the positive electrode material is divided into 100 parts. 0.8 Co 0.1 Mn 0.1 O 2 The proportion is 96 parts, the proportion of adhesive is 2.5 parts, and the proportion of conductive agent is 1.5 parts.

[0213] In the above technical solution, when the soft-pack battery cell 12 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output a higher amount of electricity in a relatively small volume and weight, meeting the application scenario with certain requirements for energy density. The amount of the binder and the conductive agent used in the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 12 is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the positive electrode active material, binder, and conductive agent in the above-mentioned dosage ratio is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and is beneficial to reducing the risk of active material shedding and electrode pulverization during charging and discharging, and extending the cycle life of the battery device 100.

[0214] The present application proposes an electric device 200, comprising: the battery device 100 in the above embodiment.

[0215] Furthermore, if Figure 1 As shown, the electrical equipment 200 can be a vehicle, and the battery device 100 can be integrated on the chassis of the vehicle, that is, the body structure is a split body, the upper body and the integrated intelligent chassis are assembled, and the battery device 100 forms a part of the integrated intelligent chassis, so that the top plate of the box body 30 can also participate in defining the body floor, which can save meaningless multi-layer plate stacking, reduce material costs, and make the space occupancy of the chassis more reasonable. The space inside the chassis for accommodating the battery device 100 is larger and the energy density is higher.

[0216] It is understandable that the electrical device 200 is constructed as a vehicle, that is, the vehicle adopts the above-mentioned battery device 100. The battery device 100 has a higher energy density and higher reliability, which can improve the driving safety of the vehicle while improving the cruising range of the vehicle.

[0217] At the same time, it should be noted that in the aforementioned test simulating thermal runaway, both ternary and lithium iron phosphate materials can be prepared according to the above-mentioned formula, which will not be repeated here.

[0218] Other structures and operations of the soft-pack battery cell 12 , the battery device 100 , and the electrical device 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0219] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0220] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A plurality of battery packs (10), the battery packs (10) being arranged in sequence along a first direction, the battery packs (10) comprising a coating shell (11) and at least one soft-pack battery cell (12), the soft-pack battery cell (12) being arranged in the coating shell (11); Among the plurality of battery packs (10), a heat insulating member (20) is provided between at least two adjacent battery packs (10).

2. The battery device according to claim 1, characterized in that: The heat insulating member (20) is provided between any two adjacent battery packs (10).

3. The battery device according to claim 1, characterized in that: The thermal insulation member (20) is constructed as any one of a nano thermal insulation material member, a glass fiber thermal insulation material member, and a ceramic fiber thermal insulation material member.

4. The battery device according to claim 3, characterized in that: The thickness dimension in the first direction is 1 mm-4 mm.

5. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a lithium iron phosphate battery; When the total electric quantity inside two adjacent battery packs (10) is less than 0.5 KWh, there is no heat insulating member (20) between the two adjacent battery packs (10).

6. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a lithium iron phosphate battery; When the total electric quantity inside the battery pack (10) is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulating member (20) is provided between the battery pack (10) and an adjacent battery pack (10), and the thickness of the heat insulating member (20) is 1 mm to 2 mm.

7. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a lithium iron phosphate battery; When the total amount of electricity in the battery pack (10) is greater than 1 KWh, a heat insulating member (20) is provided between the battery pack (10) and an adjacent battery pack (10), and the thickness of the heat insulating member (20) is 2 mm to 3 mm.

8. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a ternary lithium battery; Furthermore, when the total electric quantity inside two adjacent battery packs (10) is less than 0.5 KWh, there is no heat insulating member (20) between the two adjacent battery packs (10).

9. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a ternary lithium battery; When the total electric quantity inside the battery pack (10) is less than or equal to 1 KWh and greater than or equal to 0.5 KWh, a heat insulating member (20) is provided between the battery pack (10) and an adjacent battery pack (10), and the thickness of the heat insulating member (20) is 2 mm to 3 mm.

10. The battery device according to claim 4, characterized in that: The soft-pack battery cell (12) is constructed as a ternary lithium battery; When the total amount of electricity in the battery pack (10) is greater than 1 KWh, a heat insulating member (20) is provided between the battery pack (10) and an adjacent battery pack (10), and the thickness of the heat insulating member (20) is 3 mm to 4 mm.

11. The battery device according to claim 1, characterized in that: The covering shell (11) comprises: a first plate (111) and second plates (112) located on both sides of the first plate (111) in the first direction, the second plate (112) being opposite to the soft-pack battery cell (12) in the first direction, and the heat insulating member (20) being connected to the second plate (112).

12. The battery device according to claim 11, characterized in that: An end of the second plate (112) facing away from the first plate (111) forms an opening, and the covering shell (11) is connected to the box body (30) of the battery device through the opening.

13. The battery device according to claim 12, characterized in that: The box body (30) comprises a bottom plate (31), and an end surface of the second plate (112) away from the first plate (111) is connected to the bottom plate (31) via an adhesive layer (32).

14. The battery device according to claim 13, characterized in that: The bottom plate (31) comprises a cold plate, and the adhesive layer (32) is located between the cold plate and the plurality of soft-pack battery cells (12).

15. The battery device according to claim 13, characterized in that: The glue layer (32) comprises: a glue layer body (321) and a glue overflow portion (322), wherein the glue overflow portion (322) is located on a side of the glue layer body (321) facing the plurality of soft-pack battery cells (12), and is located between adjacent soft-pack battery cells (12), and / or between the soft-pack battery cells (12) and the second plate (112), and / or between the second plate (112) and the thermal insulation component (20).

16. The battery device according to claim 13, characterized in that: The soft-pack battery cell (12) comprises: a flexible shell (121) and an electrode assembly (122) arranged in the flexible shell (121); the flexible shell (121) has a side surface (1211) opposite to a large surface of the electrode assembly (122) and a circumferential surface (1212) avoiding the large surface; the side surface (1211) and / or the circumferential surface (1212) are provided with a weak portion (1213); the covering shell (11) has a pressure relief portion (1111) at least partially opposite to the weak portion (1213); the pressure relief portion (1111) is formed on the first plate (111).

17. The battery device according to claim 1, characterized in that: When projected along the first direction, the projection outline of the soft-pack battery cell (12) is located within the projection outline range of the thermal insulation component (20).

18. The battery device according to any one of claims 1 to 17, characterized in that: The soft-pack battery cell (12) is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell and a solid-state battery cell.

19. An electrical equipment, characterized in that: include: The battery device according to any one of claims 1 to 18.

20. The electrical equipment according to claim 19, characterized in that: The electrical equipment is a vehicle.

21. The electrical equipment according to claim 20, characterized in that: The battery device is integrated into the chassis of the vehicle, and the top plate of the box (30) helps define the vehicle body floor.

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