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 box body, a plurality of battery packs and a limiting plate, and the box body is provided with a containing cavity; the battery packs are arranged in the accommodating cavity, each battery pack comprises a plurality of soft package battery monomers, the first side surfaces of the battery packs are connected with the box body, and the limiting plates are at least connected with the second side surfaces of the battery packs and are connected with the box body; wherein the first side surface and the second side surface are different side surfaces of the battery pack. Therefore, by arranging the limiting plate and enabling the limiting plate to be connected with the battery pack on the second side surface, the battery pack can be limited in at least two directions, and the movement of the battery pack in the box body can be reduced, so that the probability of extrusion and scratch of the soft package battery monomers is 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 an electrical equipment. Background Art

[0002] In the related art, the fixing stability of the battery pack of the soft-pack battery device is relatively low, resulting in the soft-pack battery device, which affects the further improvement of the reliability of the soft-pack battery device. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a battery device and an electrical equipment, the structural stability of the battery device is higher, the fixing stability of the battery pack in the battery device is higher, the probability of crosstalk and collision is lower, and it is more reliable.

[0004] In a first aspect, the present application provides a battery device, including: a box body, a plurality of battery packs and a limiting plate, the box body has a receiving cavity; the battery packs are arranged in the receiving cavity, and each battery pack includes a plurality of soft-pack battery monomers, the first side surface of the battery pack is connected to the box body, the limiting plate is connected to at least the second side surface of the battery pack and is connected to the box body; wherein the first side surface and the second side surface are different side surfaces of the battery pack.

[0005] According to the battery device of the embodiment of the present application, by providing a limiting plate and connecting the limiting plate to the battery pack on the second side surface, it is possible to limit the battery pack in at least two directions, reduce the crosstalk of the battery pack in the box body, and reduce the probability of extrusion and scratch of the soft-pack battery monomers, thereby improving the reliability of the battery device.

[0006] According to some embodiments of the present application, there are a plurality of limiting plates, and the plurality of limiting plates are arranged at intervals in the arrangement direction of the battery packs, and a limiting space is defined between adjacent limiting plates and between the limiting plate and the box body, and at least one battery pack is arranged in each limiting space.

[0007] In the above technical solution, two adjacent limiting plates, or a limiting plate and a side plate of the box body can respectively limit the battery pack on both sides of the length or width of the battery pack, and one side of the battery pack in the height direction perpendicular to the arrangement direction is connected to the box body, that is, one surface (top surface or bottom surface) of the height side of the battery pack forms the first side surface, and the two side surfaces of the width or length of the battery pack form the second side surface, so as to limit the battery pack through the adjacent first side surface and second side surface, and the limiting reliability of the battery pack in the box body is higher, and the reliability of the battery device is higher.

[0008] According to some embodiments of the present application, 1-3 battery packs are arranged in each limiting space.

[0009] In the above technical solution, the number of battery packs in each limiting space of the present application does not exceed 3, which can make the number of battery packs in the limiting space more reasonable, so as to improve the limiting effect of the limiting plate on the battery packs.

[0010] According to some embodiments of the present application, the box body includes a bottom plate for carrying the battery packs and a top plate opposite to the bottom plate, and the battery packs are connected to the bottom plate.

[0011] In the above technical solution, the bottom plate and the top plate of the box body are oppositely arranged in the height direction. The bottom plate is used to support the battery packs. The bottom surface of the battery packs forms a first side surface and is connected to the bottom plate. At the same time, the top plate is opposite to the top surface of the battery packs. In this way, while being connected to the box body through the bottom surface, the battery packs can, under the action of gravity, improve the connection reliability and stability between the bottom surface of the battery packs and the box body.

[0012] According to some embodiments of the present application, the limiting plate is arranged on the bottom plate, and / or the limiting plate is arranged on the top plate.

[0013] In the above technical solution, while realizing the limiting of the battery packs between adjacent surfaces through the cooperation of the limiting plate and the box body, the setting difficulty of the limiting plate is lower, and the setting position is more reasonable, which can reduce the assembly difficulty of the battery device and take into account the energy density of the battery device.

[0014] According to some embodiments of the present application, the limiting plate includes: a first limiting plate and a second limiting plate. The first limiting plate is arranged on the bottom plate, the second limiting plate is arranged on the top plate, and the first limiting plate and the second limiting plate are oppositely arranged.

[0015] In the above technical solution, the first limiting plate and the second limiting plate can limit the battery packs at the same time, which can improve the limiting effect of the battery packs. And in the limiting direction of the limiting plate, the force distribution of the battery packs is more uniform, and the probability of stress concentration of the battery packs can also be reduced, so as to improve the limiting reliability and stability.

[0016] According to some embodiments of the present application, the soft-pack battery cell includes: a flexible outer shell and an electrode assembly arranged in the flexible outer shell. The flexible outer shell has a third side surface opposite to the large surface of the electrode assembly, and a circumferential surface avoiding the large surface. The circumferential surface and the third side surface are circumferentially connected around the electrode assembly. The limiting plate is opposite to the third side surface, and the surface area of the opposite side of the limiting plate and the third side surface is less than or equal to the surface area of the third side surface.

[0017] In the above technical solution, the third side surface is the largest surface of the flexible outer shell, and the third surface faces the limiting plate. Then, the limiting plate can limit the soft-pack battery cell outside the largest surface of the flexible outer shell. The area of the region where the limiting plate and the soft-pack battery cell are oppositely arranged can be larger, and the limiting effect can be better. Moreover, the surface area of the surface of the limiting plate opposite to the third side surface can be less than or equal to the surface area of the third side surface. While achieving the limit, it is possible to avoid the excessive size of the limiting plate, reduce the probability of interference between the limiting plate and surrounding components, and thus reduce the assembly difficulty of the battery pack.

[0018] According to some embodiments of the present application, the length dimension of the limiting plate is less than or equal to the length dimension of the third side surface, and / or the width dimension of the limiting plate is less than or equal to the width dimension of the third side surface.

[0019] According to some embodiments of the present application, the surface area of the side of the limiting plate opposite to the battery pack is S1, and the surface area of the side of the battery pack opposite to the limiting plate is S2, and it satisfies: 0.5 ≤ S1 / S2 ≤ 1.

[0020] In the above technical solution, on the one hand, it is possible to avoid the size of the limiting plate being larger than the side size of the battery pack, so as to avoid interference caused by the limiting plate during the assembly of the battery pack, reduce the assembly difficulty, and improve the assembly efficiency. On the other hand, it is possible to avoid the size of the limiting plate being too small, so that the limiting effect of the limiting plate on the battery pack is reliable and stable.

[0021] According to some embodiments of the present application, the dimension of the limiting plate in the arrangement direction of the battery pack is 1 mm to 3 mm.

[0022] In the above technical solution, on the one hand, making the thickness dimension of the limiting plate not less than 1 mm can maintain the stable and reliable limiting effect of the limiting plate. On the other hand, making the size of the limiting plate not greater than 3 mm can make the thickness dimension of the limiting plate more reasonable, avoid the excessive thickness dimension of the limiting plate, reduce the material cost, and also take into account the energy density of the battery device.

[0023] According to some embodiments of the present application, the limiting plate is configured as any one of a metal material part and a plastic material part.

[0024] In the above technical solution, in the embodiment where the limiting plate is made of a metal material part, the limiting plate can be integrally formed with the box body, which reduces the processing difficulty and also has higher limiting reliability and stability. In the embodiment where the limiting plate is made of a plastic part, the insulating property of the limiting plate is better, which can improve the reliability and the overall cost is lower.

[0025] According to some embodiments of the present application, the limiting plate is configured as a plastic part and has a melting point greater than 300 degrees Celsius.

[0026] In the above technical solution, in the embodiment where the limiting plate is made of a plastic part, the melting point of the plastic part is greater than 300 degrees Celsius, which can reduce the probability of the limiting plate melting and deforming during thermal runaway, so that when the battery device experiences thermal runaway, the limiting plate can still limit the position reliably and stably, and can also achieve a certain blocking effect on the high-pressure gas and fire flow, and can also reduce the spread speed of thermal runaway.

[0027] According to some embodiments of the present application, the battery pack further includes a covering shell that covers the soft-pack battery cell. The covering shell includes a first plate and second plates located on both sides of the first plate, and the second plates are connected to the limiting plate.

[0028] In the above technical solution, by connecting the second plate to the limiting plate, that is, the second plate defines a second side surface and is connected to the limiting plate, so that the limiting plate is pushed against the second plate to achieve the position limitation of the battery pack. On the premise of meeting the position limitation effect, during the position limitation process, the limiting plate will not directly push against the soft-pack battery cell, and can also reduce the probability of damage to the battery pack, further improving the reliability of the battery device.

[0029] According to some embodiments of the present application, a pressure relief part is formed on the first plate, and a weak part is formed on the soft-pack battery cell, and the weak part is at least partially opposite to the pressure relief part.

[0030] In the above technical solution, on the one hand, the gas and fire flow generated after the thermal runaway of the soft-pack battery cell can be discharged directionally to achieve orderly discharge, so as to reduce damage, especially secondary damage. On the other hand, the communication path between the weak part and the pressure relief part is shorter, which can achieve rapid discharge, and at the same time, the time for the gas and fire flow to stay inside the covering shell is shorter, and the impact on other soft-pack battery cells around the thermally runaway soft-pack battery cell is smaller, and can also further reduce the spread speed of thermal runaway and improve the reliability of the battery pack and the battery device.

[0031] According to some embodiments of the present application, the first plate is spaced apart from the side of the circumferential surface having the weak part to define an exhaust channel.

[0032] In the above technical solution, the high-temperature gas and fire flow generated after the weak part ruptures can be first discharged to the exhaust channel, and after being preliminarily buffered by passing through the exhaust channel, it is discharged through the pressure relief part, which can reduce the pressure of the high-temperature gas and fire flow after flowing out of the pressure relief part, so as to reduce the impact and damage after the thermal runaway of the soft-pack battery cell.

[0033] According to some embodiments of the present application, the first plate is configured as a flat plate or an arc-shaped plate.

[0034] According to some embodiments of the present application, there are multiple pressure relief parts, and the multiple pressure relief parts are spaced apart in the length direction and / or width direction of the first plate.

[0035] In the above technical solution, multiple weak parts on each soft-pack battery cell can each have a corresponding pressure relief part, so that the high-temperature gas and fire flow buffered by the exhaust passage can be directly discharged through the corresponding pressure relief part, improving the discharge speed and reducing the residence time of the high-temperature gas and fire flow in the exhaust passage during the discharge process, so as to reduce the spread speed of thermal runaway between adjacent soft-pack battery cells in the battery pack and improve the reliability of the battery pack.

[0036] According to some embodiments of the present application, the coating shell is configured as an aluminum shell or a stainless steel shell.

[0037] According to some embodiments of the present application, the box body has a bottom plate, and the bottom plate is connected to the second plate and the first side surface through an adhesive layer.

[0038] In the above technical solution, the bottom plate of the box body is connected to the second side surface of the soft-pack battery cell (i.e., the above second surface is formed as the second side surface) and the second plate of the coating shell through an adhesive layer, so as to fix the battery pack on the box body and improve the fixing stability and reliability of the battery pack.

[0039] According to some embodiments of the present application, the bottom plate includes a cold plate, and the adhesive layer is located between the cold plate and multiple soft-pack battery cells.

[0040] In the above technical solution, the adhesive layer is configured as a structural adhesive, and the bottom plate configured 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 realizing the stable and reliable fixation of the battery pack in the box body, the temperature of the battery pack can also be adjusted through the cold plate, so that the battery pack can work 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, so as to reduce the probability of thermal runaway of the battery pack, and further improve the reliability of the battery pack and even the battery device.

[0041] According to some embodiments of the present application, the adhesive layer includes: an adhesive layer body and an overflow adhesive part, and the overflow adhesive part is located on the side of the adhesive layer body facing multiple soft-pack battery cells, and is located between adjacent soft-pack battery cells, and / or between the soft-pack battery cell and the second plate.

[0042] 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 overflow adhesive part. Through the setting of the overflow adhesive part, not only can the area between the adhesive layer and the soft-pack battery cell and between the adhesive layer and the second plate be increased to improve the fixing stability and reliability of the battery pack on the box body, 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 overflow adhesive part to realize the limitation of the soft-pack battery cell and the coating shell, reduce the crosstalk of the battery pack in the box body, and reduce the crosstalk of the soft-pack battery cell in the coating shell.

[0043] According to some embodiments of the present application, the pouch battery cell is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0044] In the above technical solution, in the embodiment where the present application is configured as a lithium iron phosphate battery cell, the reliability of the pouch battery cell can be improved, and the cycle life of the pouch battery cell can be extended. In the embodiment where the present application is configured as a ternary lithium battery cell, the energy density of the pouch battery cell can be increased, and the cruising range can be improved. In the embodiment where the present application is configured as a solid-state pouch battery cell, not only the energy density can be increased, but also the reliability can be improved.

[0045] In a second aspect, the present application provides an electrical device, including: the battery device in the above embodiment.

[0046] According to some embodiments of the present application, the electrical device is a vehicle.

[0047] In the above technical solution, when the electrical device is configured as a vehicle, the energy density of the battery device is higher and the reliability is higher. While improving the cruising range of the vehicle, the driving reliability of the vehicle can also be improved.

[0048] 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 participates in defining the vehicle body floor.

[0049] In the above technical solution, the electrical device can be a vehicle, and the battery device can be integrated on the chassis of the vehicle, that is, the vehicle body is configured as a split vehicle body, the upper vehicle body and the integrated intelligent chassis are assembled, and the battery device forms a part of the integrated intelligent chassis. Furthermore, the top plate of the box can also participate in defining the vehicle body floor, which can eliminate the meaningless stacking of multiple layers of plates, reduce the material cost, and make the space occupied by the chassis more reasonable. The space inside the chassis for accommodating the battery device is larger, and the energy density is higher.

[0050] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0051] The above and / or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0052] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0053] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0054] Figure 3 Schematic diagram of the cooperation of the battery pack, the limiting plate and the box body according to the first embodiment of the present application;

[0055] Figure 4 Schematic diagram of the cooperation of the battery pack, the limiting plate and the box body according to the second embodiment of the present application;

[0056] Figure 5 Schematic diagram of the cooperation of the battery pack, the limiting plate and the box body according to the third embodiment of the present application;

[0057] Figure 6 Schematic diagram of the cooperation of the battery pack, the limiting plate and the box body according to the fourth embodiment of the present application;

[0058] Figure 7 Schematic diagram of the battery pack according to the embodiment of the present application;

[0059] Figure 8 Schematic diagram of the connection between the battery pack and the box body according to the embodiment of the present application;

[0060] Figure 9 Schematic diagram of the battery cell according to the embodiment of the present application.

[0061] Reference numerals:

[0062] Battery device 100,

[0063] Box body 10, bottom plate 11, top plate 12, glue layer 13, glue layer body 131, overflow glue part 132,

[0064] Battery pack 20, soft-pack battery cell 21, flexible outer shell 211, third side 2111, circumferential surface 2112, weak part 2113, electrode assembly 212, coating shell 22, first plate 221, pressure relief part 2211, second plate 222,

[0065] First side 20a, second side 20b,

[0066] Limiting plate 30, first limiting plate 31, second limiting plate 32,

[0067] Electrical equipment 200, motor 300, controller 400,

[0068] Exhaust passage a. Detailed implementation manners

[0069] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0071] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0072] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", 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 directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0074] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0075] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0076] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0077] In the description of the present utility model, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0078] The term "a plurality of" as used in this application refers to two or more (including two).

[0079] The battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0080] The battery cell may 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of this application do not limit this.

[0081] The battery device mentioned in the embodiments of this application may include one or more battery packs for providing voltage and capacity. The battery pack may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a bus bar.

[0082] In some embodiments, the battery pack is usually formed by arranging a plurality of battery cells.

[0083] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery packs, and the battery pack is accommodated in the box body.

[0084] As an example, the battery pack may be a battery module, and the battery pack may be accommodated in the box body by fixing the battery module in the box body.

[0085] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery pack. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0086] 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.

[0087] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0088] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0089] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiments of this application do not impose special restrictions on the above-mentioned electrical equipment.

[0090] For the convenience of description, the following embodiments will take the electrical equipment as a vehicle as an example for description.

[0091] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by some embodiments of this application. A battery device 100 is provided inside the vehicle. The battery device 100 can be arranged at the bottom, the head, or the tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle.

[0092] 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 is formed as a load, for example, for the working power requirements during the start, navigation, and driving of the vehicle.

[0093] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0094] Please refer to Figure 2 , Figure 2 which is an exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10, and the box body 10 is used to accommodate battery cells.

[0095] Among them, the box body 10 is a component for accommodating battery cells. The box body 10 provides a placement space for the battery pack 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a tray and a cover plate. The tray and the cover plate are covered with each other to define a placement space for accommodating battery cells. The tray and the cover plate can be of various shapes, for example, a cuboid, 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. The open side of the cover plate is covered on the open side of the tray, thus forming the box body 10 with a placement space. It can also be that the tray is a hollow structure with one side open and the cover plate is a plate-like structure. The cover plate is covered on the open side of the tray, thus forming the box body 10 with a placement space.

[0096] As an example, the battery cell can be a soft-pack battery cell 21.

[0097] In the battery device 100, the battery cells can be one or multiple. Multiple battery cells are loaded into a battery pack 20 through a coating shell 22. One or more battery packs 20 are loaded into the box body 10. And if there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells. It can be that multiple battery cells are first connected in series, in parallel or in a mixed connection to form a battery pack 20, and then multiple battery packs 20 are connected in series, in parallel or in a mixed connection to form a whole and are accommodated in the box body 10.

[0098] Combined with Figure 9 , the battery cell is the smallest energy unit of the battery device 100. The battery cell includes a flexible outer shell 211 and an electrode assembly 212 disposed inside the flexible outer shell 211.

[0099] The internal environment formed by the flexible outer shell 211 can be used to accommodate the electrode assembly 212, the electrolyte and other components. One side of the flexible outer shell 211 can form an opening for injecting the electrolyte and the electrode assembly 212 into the shell.

[0100] Such as Figure 9As shown, the tab of the electrode assembly 212 penetrates through the flexible housing 211, and the tab is electrically connected to the bus bar. The electrode assembly 212 is a component in the battery cell where an electrochemical reaction occurs. The flexible housing 211 may contain one or more electrode assemblies 212. The electrode assembly 212 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 212, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the tabs. The positive electrode tab and the negative electrode tab may be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging 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 bus bar to form a current loop.

[0101] The positive electrode plate may include a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector. The positive electrode film layer includes a positive electrode active material.

[0102] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode film layer is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0103] 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, aluminum or stainless steel with silver surface treatment, 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 (such as 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.).

[0104] As an example, when the soft-pack battery cell 21 in 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 improving the energy density of the soft-pack battery cell 21. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery positive electrode film layer can also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0105] Examples of phosphates may include but are not limited to lithium iron phosphate (such as LiFePO 4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4) At least one of the composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, the composite material of lithium manganese iron phosphate and carbon.

[0106] The layered transition metal oxide includes a compound with the general formula Li a Ni b Co c M d O e A f and at least one of its modified compounds. 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, and further optionally, 0.75 ≤ b ≤ 0.98.

[0107] Examples of the layered transition metal oxide may include, but are not limited to, lithium cobalt oxide (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 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 ), LiNi 0.9 Co 0.05 Mn 0.05 O 2(It can also be simply 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.

[0108] When the soft-pack battery cell 21 in 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-based materials.

[0109] As an example, the 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-based materials, materials with the 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.

[0110] In the embodiments of the present application, the modified compounds of the above-mentioned cathode active materials can be doping modification and / or surface coating modification of the cathode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0111] During the charge and discharge process of the soft-pack battery cell 21, the insertion and extraction and consumption of active ions such as Li will occur, and the molar content of Li is different when the soft-pack battery cell 21 is discharged to different states. In the listing of the cathode active materials in the embodiments of the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. When the cathode active material is applied to the battery system and undergoes charge and discharge cycles, the molar content of Li may change.

[0112] In the listing of the cathode active materials in the embodiments of the present application, the molar content of oxygen O is only the theoretical state value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. Actually, the molar content of oxygen O will show fluctuations.

[0113] In the embodiments of the present application, the content of elements in the cathode active material has the meaning well-known in the art, and can be detected by equipment and methods well-known in the art. For example, referring to EPA 6010D-2014, it is tested by inductively coupled plasma atomic emission spectrometry, and determined by inductively coupled plasma optical emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4 g of the cathode active material is weighed, and 10 ml (50% concentration) of aqua regia is added thereto. Then it is placed on a flat plate at 180 °C for 30 min. After digestion on the flat plate, it is fixed to a volume of 100 mL, and quantitative testing is carried out by the standard curve method.

[0114] In some embodiments, the cathode can use foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the cathode, a cathode film layer may not be provided on the surface of the foam metal, and of course, a cathode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal can be filled and / or deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0115] In some embodiments, the cathode film layer may optionally further include a cathode conductive agent. The embodiments of the present application do not particularly limit the type of the cathode conductive agent. As an example, the cathode 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 content of the cathode conductive agent in the cathode film layer is ≤ 5 wt%.

[0116] In some embodiments, the positive electrode film layer may further optionally include a positive electrode binder. There is no particular limitation on the type of the positive electrode binder in the embodiments of the present application. 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 fluorinated acrylate resin. In some embodiments, the mass percentage content of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0117] The positive electrode film layer is usually formed by coating a positive electrode slurry on a positive electrode current collector and then drying and cold pressing. The positive electrode slurry is usually formed by dispersing a positive electrode active material, an optional conductive agent, an optional binder, and any other components in a solvent and stirring evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0118] In some embodiments, the negative electrode may be a negative electrode plate, and the negative electrode plate may include a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector, and the negative electrode film layer includes a negative electrode active material.

[0119] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode film layer is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0120] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0121] As an example, the negative electrode active material can be the negative electrode active material known in the art for the soft-pack battery cell 21. As an example, the negative electrode active material can include at least one of the following materials: carbon materials (for example, carbon materials include at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can include at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can include at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery negative electrode film layer can also be used. These negative electrode film layers can be used alone or in combination of two or more.

[0122] In some embodiments, the negative electrode active material includes silicon element, and the silicon element can exist in the form of silicon-based materials. For example, the silicon-based materials can include at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The introduction of the silicon element can improve the energy density of the soft-pack battery cell 21.

[0123] In some embodiments, the mass content of the silicon element in the negative electrode film layer is 1 wt% to 32 wt%, optionally 2 wt% to 19 wt%, and further optionally 6 wt% to 13 wt%. In the system of the soft-pack battery cell 21, when the mass content of the silicon element is within the above range, the energy density of the soft-pack battery cell 21 can be improved.

[0124] In the embodiments of the present application, the mass content of the silicon element in the negative electrode film layer has the meaning known in the art, and can be detected by the equipment and methods known in the art. For example, the negative electrode plate is placed in a solvent such as water and soaked to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material is obtained by suction filtration. The negative electrode active material is analyzed by an inductively coupled plasma-emission spectrometer of model ICAP7400 from Thermo Fisher Scientific Company, USA, with reference to the standard of GB / T 30902-2014, and the content of the silicon element can be obtained.

[0125] In some embodiments, the negative electrode film layer may optionally further include a negative electrode conductive agent. The embodiments of the present application do not particularly limit the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent can 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 content of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0126] In some embodiments, the negative electrode film layer may further optionally include a negative electrode binder. There is no particular limitation on the type of the negative electrode binder in the embodiments of the present application. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, aqueous acrylic resin (for example, 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 content of the negative electrode binder in the negative electrode film layer is ≤5%.

[0127] In some embodiments, the negative electrode film layer may further optionally 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 content of the other additives in the negative electrode film layer is ≤2 wt%.

[0128] 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.

[0129] In some embodiments, the separator includes a separator membrane. There is no particular limitation on the type of the separator membrane in the present application, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0130] There is no particular limitation on the type of the separator membrane in the embodiments of the present application, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0131] In some embodiments, the material of the separator membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0132] In some embodiments, the separator membrane may include a porous base film and a coating disposed on at least one side of the porous base film, and the coating may include at least one of inorganic particles or organic particles.

[0133] The porous base film may include one or more of polyethylene and polypropylene.

[0134] The inorganic particles have good heat resistance and can improve the overall heat resistance of the separator membrane. The inorganic particles basically do not undergo oxidation and reduction reactions with metal dendrites within the working 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.

[0135] In some embodiments, the inorganic particles include boehmite γ-AlOOH, aluminum oxide 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 , strontium titanate SrTiO 3 , barium titanate BaTiO 3 and magnesium fluoride MgF 2 , or one or more of them.

[0136] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramide, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and their mixtures.

[0137] In some embodiments, the pouch cell monomer 21 further includes an electrolyte.

[0138] During the charge and discharge process of the cell monomer, active ions are embedded and extracted back and forth between the positive electrode plate and the negative electrode plate, and the electrolyte plays a role in conducting active ions between the positive electrode plate and the negative electrode plate. There is no particular limitation on the type of the electrolyte in the embodiments of the present application, and it can be selected according to actual needs.

[0139] The electrolyte includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not specifically limited and can be selected according to actual needs.

[0140] In some embodiments, additives may also be optionally included in the electrolyte. For example, the additives may include negative electrode film-forming additives, or may include positive electrode film-forming additives, or may also include additives that can improve certain performance of the battery, such as additives for improving the overcharge performance of the battery, additives for improving the high-temperature performance of the battery, additives for improving the low-temperature power performance of the battery, etc.

[0141] For example, the additives include at least one of cyclic carbonate compounds containing unsaturated bonds, sulfate compounds, sulfite compounds, sultone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphazene compounds, acid anhydrides, cyclic acid anhydride compounds, phosphite compounds, phosphate compounds, borate esters, and carboxylic ester compounds.

[0142] In the related art, a cladding shell 22 is disposed outside a plurality of pouch battery cells 21 and is used to support the pouch battery cells 21. A plurality of battery packs 20 are sequentially disposed in the length direction and / or the width direction of the battery device 100. Only the bottom surface of the battery pack 20 is connected to the box body 10. The battery packs 20 cannot be effectively limited in the arrangement direction, and the battery packs 20 tend to move in the arrangement direction, and may even squeeze or scratch the pouch battery cells 21.

[0143] Based on this, the present application provides a battery device 100. The battery pack 20 is connected to the box body 10 through a first side surface 20a, and a limiting plate 30 can be connected to the battery pack 20 on a second side surface 20b of the battery pack 20. By connecting the first side surface 20a to the box body 10 and connecting the second side surface 20b to the limiting plate 30, the battery pack 20 can be limited in at least two directions, so as to improve the fixing stability of the battery pack 20, reduce the movement of the battery pack 20, and reduce the probability that the pouch battery cells 21 in the battery pack 20 are squeezed or scratched, thereby improving the reliability of the battery device 100.

[0144] Next, reference is made to Figures 1 - 9 Describe the battery device 100 and the electrical equipment 200 according to the embodiments of the present invention.

[0145] As Figure 2 shown, the present application provides a battery device 100, including: a box body 10, a plurality of battery packs 20, and a limiting plate 30.

[0146] Among them, the box body 10 has an accommodation cavity; the battery packs 20 are disposed in the accommodation cavity, and each battery pack 20 includes a plurality of pouch battery cells 21. A first side surface 20a of the battery pack 20 is connected to the box body 10, and the limiting plate 30 is connected to at least a second side surface 20b of the battery pack 20 and is connected to the box body 10; wherein the first side surface 20a and the second side surface 20b are different side surfaces of the battery pack 20.

[0147] Specifically, as Figure 7 shown, a plurality of pouch battery cells 21 are disposed in each battery pack 20. The flexible outer shell 211 of the pouch battery cell 21 may include a third side surface 2111 opposite to the large surface of the electrode assembly 212 and a circumferential surface 2112. After a plurality of pouch battery cells 21 form a battery pack 20, the battery pack 20 may include a plurality of surfaces corresponding to the circumferential surface 2112 and two surfaces corresponding to the third side surface 2111. One of the plurality of surfaces corresponding to the circumferential surface 2112 is formed as the first side surface 20a, and the first side surface 20a is directly fixed to the box body 10. The other of the plurality of surfaces corresponding to the third side surface 2111 or the circumferential surface 2112 is formed as the second side surface 20b and is connected to the limiting plate 30 through the second side surface 20b.

[0148] Exemplarily, the battery pack 20 includes a first surface and a second surface corresponding to opposite sides, a third surface, a fourth surface, a fifth surface, and a sixth surface corresponding to the circumferential surface 2112, wherein the first surface is opposite to the second surface, the third surface is opposite to the fourth surface, the fifth surface is opposite to the sixth surface, and one of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface is formed as the first side surface 20a, and another one of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface is formed as the second side surface 20b, so that the first side surface 20a and the second side surface 20b can be adjacent surfaces or opposite surfaces.

[0149] It can be understood that the first surface can limit the battery pack 20 in one direction, the second surface can limit the battery pack 20 in another direction, and the first surface and the second surface can be adjacent surfaces or opposite surfaces to limit the battery pack 20 in two opposite or adjacent directions, thereby reducing the movement of the battery pack 20 and reducing the probability of the soft-pack battery cell 21 being squeezed or scratched.

[0150] For the battery device 100 according to the embodiment of the present application, by providing the limiting plate 30 and connecting the limiting plate 30 to the battery pack 20 on the second side surface 20b, the battery pack 20 can be limited in at least two directions, the movement of the battery pack 20 in the box body 10 can be reduced, and the probability of the soft-pack battery cell 21 being squeezed or scratched can be reduced, thereby improving the reliability of the battery device 100.

[0151] Combined with Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, according to some embodiments of the present application, there are multiple limiting plates 30, and the multiple limiting plates 30 are spaced apart in the arrangement direction of the battery pack 20, and a limiting space is defined between adjacent limiting plates 30 and between the limiting plate 30 and the box body 10, and at least one battery pack 20 is arranged in each limiting space.

[0152] Specifically, the battery packs 20 can be arranged in the length direction or the width direction of the battery device 100, there are multiple limiting plates 30, and the multiple limiting plates 30 are spaced apart in the arrangement direction of the battery packs 20 to define one or more limiting spaces between adjacent limiting plates 30 and between the limiting plate 30 and the side plate of the box body 10, and the battery packs 20 are arranged in the limiting spaces.

[0153] In this way, two adjacent limiting plates 30, or one limiting plate 30 and the side plate of the box body 10 can limit the battery pack 20 on both sides of the length or width of the battery pack 20 respectively. One side of the battery pack 20 in the height direction of the vertical arrangement direction is connected to the box body 10, that is, one side surface (top surface or bottom surface) of the height of the battery pack 20 is formed as the first side surface 20a, and the two side surfaces of the width or the two side surfaces of the length of the battery pack 20 are formed as the second side surface 20b, so as to realize the limitation of the battery pack 20 through the adjacent first side surface 20a and the second side surface 20b, and the reliability of limiting the battery pack 20 in the box body 10 is higher, and the reliability of the battery device 100 is higher.

[0154] According to some embodiments of the present application, 1 to 3 battery packs 20 are arranged in each limiting space.

[0155] That is to say, one battery pack 20, two battery packs 20 or three battery packs 20 can be accommodated in the limiting space.

[0156] It can be understood that in the arrangement direction, as the stacking quantity of the battery packs 20 increases, the size of the battery device 100 in the arrangement direction gradually increases. And in each limiting space, the more the number of the battery packs 20, the greater the distance between the adjacent limiting plates 30, and the worse the limiting effect of the limiting plates 30 on the battery packs 20. Especially as the number of the battery packs 20 in the limiting space increases, the limiting effect of the limiting plates 30 on the battery packs 20 located at the middle position in the limiting space will gradually decrease.

[0157] Based on this, the present application makes the number of the battery packs 20 in each limiting space not exceed 3, so that the number of the battery packs 20 in the limiting space is more reasonable, in order to improve the limiting effect of the limiting plates 30 on the battery packs 20.

[0158] Combined with Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, according to some embodiments of the present application, the box body 10 includes a bottom plate 11 for carrying the battery pack 20 and a top plate 12 opposite to the bottom plate 11, and the battery pack 20 is connected to the bottom plate 11.

[0159] Specifically, the bottom plate 11 and the top plate 12 of the box body 10 are oppositely arranged in the height direction. The bottom plate 11 is used to support the battery pack 20. The bottom surface of the battery pack 20 is formed as the first side surface 20a and is connected to the bottom plate 11. At the same time, the top plate 12 is opposite to the top surface of the battery pack 20. In this way, while being connected to the box body 10 through the bottom surface, the battery pack 20 can, under the action of gravity, improve the connection reliability and stability between the bottom surface of the battery pack 20 and the box body 10.

[0160] It should be noted that if other surfaces of the battery pack 20 are connected to the box body 10, the gravity of the battery pack 20 itself or the component force of the gravity will cause a moment for the battery pack 20 to move away from the connection area, and the connection strength and connection reliability are both lower than those when the bottom surface is directly connected to the box body 10.

[0161] According to some embodiments of the present application, the limiting plate 30 is arranged on the bottom plate 11, and / or the limiting plate 30 is arranged on the top plate 12.

[0162] It should be noted that the limiting plate 30 is used to be connected to the second side surface 20b to realize the limitation of the battery pack 20 in the direction where the second side surface 20b is located. In the embodiment where the bottom plate 11 is connected to the battery pack 20, the limiting plate 30 can be arranged on the bottom plate 11 and located between adjacent battery packs 20, or can be located on the top plate 12 and located between adjacent battery packs 20, or the limiting plate 30 can be arranged on both the bottom plate 11 and the top plate 12 and the limiting plate 30 is located between adjacent battery packs 20.

[0163] In this way, while realizing the limitation of the battery pack 20 between adjacent surfaces through the cooperation of the limiting plate 30 and the box body 10, the setting difficulty of the limiting plate 30 is lower, the setting position is more reasonable, the assembly difficulty of the battery device 100 can be reduced, and the energy density of the battery device 100 can be taken into account.

[0164] As Figure 3 shown, in the first embodiment, the limiting plate 30 includes: a first limiting plate 31 and a second limiting plate 32. The first limiting plate 31 is arranged on the bottom plate 11, the second limiting plate 32 is arranged on the top plate 12, and the first limiting plate 31 and the second limiting plate 32 are arranged opposite to each other.

[0165] Specifically, a plurality of first limiting plates 31 are arranged opposite to each other in the arrangement direction of the battery packs 20, a plurality of second limiting plates 32 are arranged opposite to each other in the arrangement direction of the battery packs 20, and the plurality of first limiting plates 31 and the plurality of second limiting plates 32 are arranged in corresponding groups, that is, each first limiting plate 31 corresponds to a second limiting plate 32, and the first limiting plate 31 and the second limiting plate 32 in a group are arranged opposite to each other in the height direction.

[0166] In this way, the first limiting plate 31 and the second limiting plate 32 can limit the battery pack 20 at the same time, the limiting effect of the battery pack 20 can be improved, and in the limiting direction of the limiting plate 30, the force distribution of the battery pack 20 is more uniform, and the probability of stress concentration of the battery pack 20 can also be reduced to improve the limiting reliability and stability.

[0167] Of course, the structure of the limiting plate 30 in the embodiments of the present application is not limited to this. In the second embodiment, as Figure 4 shown, only the limiting plate 30 is arranged on the top plate 12. In the third embodiment, as Figure 5As shown, only the bottom plate 11 is provided with a limiting plate 30, and the shape of the limiting plate 30 can be any one of a rectangle, a circle, and a triangle, that is, as Figure 6 As shown, in the fourth embodiment, a limiting plate 30 is provided on the bottom plate 11, and the limiting plate 30 is configured as a triangular plate whose projection profile in the arrangement direction of the battery pack 20 is a triangle.

[0168] Of course, in the embodiment where the limiting plate 30 is configured as a triangular plate, the limiting plate 30 can be configured as an isosceles triangular plate.

[0169] As Figure 9 As shown, according to some embodiments of the present application, the pouch cell monomer 21 includes: a flexible outer shell 211 and an electrode assembly 212 disposed within the flexible outer shell 211. The flexible outer shell 211 has a third side surface 2111 opposite to the large surface of the electrode assembly 212, and a circumferential surface 2112 avoiding the large surface. The circumferential surface 2112 is circumferentially connected to the third side surface 2111 around the electrode assembly 212. The limiting plate 30 is opposite to the third side surface 2111, and the surface area of the opposite side of the limiting plate 30 and the third side surface 2111 is less than or equal to the surface area of the third side surface 2111.

[0170] As Figure 2 As shown, the present application provides a battery device 100, including: a box body 10 and a battery pack 20. The battery pack 20 is at least one, and the battery pack 20 includes: at least one pouch cell monomer 21 in the above embodiments and a covering shell 22. At least one side surface of the covering shell 22 has a pressure relief portion 2211.

[0171] Wherein, an accommodation space is formed in the box body 10, and one or more battery packs 20 are disposed in the accommodation space. One or more pouch cell monomers 21 are disposed inside the covering shell 22 of each battery pack 20, and the pouch cell monomer 21 is configured as the pouch cell monomer 21 adopting the flexible outer shell 211 as described above.

[0172] The covering shell 22 is at least used to cover at least one of the plurality of circumferential surfaces 2112 and two third side surfaces 2111 of the pouch cell monomer 21. At least one circumferential surface 2112 of the pouch cell monomer 21 is provided with a weak portion 2113, and a pressure relief portion 2211 is formed on at least one side surface of the covering shell 22. For example, the pressure relief portion 2211 is opposite to the weak portion 2113, or the pressure relief portion 2211 is located on the first surface of the covering shell 22, and the weak portion 2113 is opposite to the second surface of the covering shell 22, and the first surface and the second surface are adjacent.

[0173] Thus, by providing a pressure relief portion 2211 on the encapsulation shell 22 that cooperates with the weak portion 2113, when a thermal runaway occurs in the soft-pack battery cell 21, the high-temperature gas and fire flow discharged through the weak portion 2113 can be further released outward through the pressure relief portion 2211. Through the cooperation of the weak portion 2113 and the pressure relief portion 2211, the directional discharge of the high-temperature gas and fire flow can be achieved, thereby improving the reliability of the battery device 100.

[0174] Furthermore, the third side surface 2111 is the largest surface of the flexible outer shell 211, and since the third surface faces the limiting plate 30, the limiting plate 30 can limit the soft-pack battery cell 21 outside the largest surface of the flexible outer shell 211. The area of the region where the limiting plate 30 and the soft-pack battery cell 21 are relatively arranged can be larger, and the limiting effect can be better. Moreover, the surface area of the surface of the limiting plate 30 opposite to the third side surface 2111 can be less than or equal to the surface area of the third side surface 2111. While achieving the limitation, the size of the limiting plate 30 can be prevented from being too large, reducing the probability of interference between the limiting plate 30 and surrounding components, and thus reducing the assembly difficulty of the battery pack 20.

[0175] Combined Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, according to some embodiments of the present application, the length dimension of the limiting plate 30 is less than or equal to the length dimension of the third side surface 2111, and / or the width dimension of the limiting plate 30 is less than or equal to the width dimension of the third side surface 2111.

[0176] That is to say, in embodiments where the surface area of the surface of the limiting plate 30 opposite to the third side surface 2111 is less than the surface area of the third side, it can be achieved by making the length dimension of the limiting plate 30 less than the length dimension of the third side surface 2111, or by making the width dimension of the limiting plate 30 less than the width dimension of the third side surface 2111, or by making the length dimension and the width dimension of the limiting plate 30 less than the length dimension and the width dimension of the third side surface 2111 respectively.

[0177] According to some embodiments of the present application, the surface area of the side of the limiting plate 30 opposite to the battery pack 20 is S1, and the surface area of the side of the battery pack 20 opposite to the limiting plate 30 is S2, and it satisfies: 0.5 ≤ S1 / S2 ≤ 1.

[0178] Exemplarily, the surface area S1 of the limiting plate 30 can be 0.5S2, 0.6S2, 0.7S2, 0.8S2, 0.9S2, S2.

[0179] In this way, on the one hand, it is possible to prevent the size of the limiting plate 30 from being larger than the side size of the battery pack 20, so as to avoid interference caused by the limiting plate 30 during the assembly process of the battery pack 20, reduce the assembly difficulty, and improve the assembly efficiency. On the other hand, it is possible to prevent the size of the limiting plate 30 from being too small, so that the limiting effect of the limiting plate 30 on the battery pack 20 is reliable and stable.

[0180] According to some embodiments of the present application, the size of the limiting plate 30 in the arrangement direction of the battery pack 20 is 1 mm to 3 mm.

[0181] Exemplarily, the thickness of the limiting plate 30 can be 1 mm, 2 mm, or 3 mm.

[0182] Wherein, when the battery packs 20 are arranged in the width direction of the battery device 100, the size of the limiting plate 30 between two adjacent battery packs 20 in the width direction is 1 mm to 3 mm. When the battery packs 20 are arranged in the length direction of the battery device 100, the size of the limiting plate 30 between two adjacent battery packs 20 in the length direction is 1 mm to 3 mm.

[0183] In this way, on the one hand, making the thickness dimension of the limiting plate 30 not less than 1 mm can maintain the stable and reliable limiting effect of the limiting plate 30. On the other hand, making the size of the limiting plate 30 not greater than 3 mm can make the thickness dimension of the limiting plate 30 more reasonable, avoid the excessive thickness dimension of the limiting plate 30, reduce the material cost, and also take into account the energy density of the battery device 100.

[0184] According to some embodiments of the present application, the limiting plate 30 is configured as any one of a metal material part and a plastic material part.

[0185] Exemplarily, the limiting plate 30 can be a stainless steel material part, an aluminum material part, a polytetrafluoroethylene material part, or a polyimide material part.

[0186] Among them, in the embodiment where the limiting plate 30 is made of a metal material part, the limiting plate 30 can be integrally formed with the box body 10. While reducing the processing difficulty, the limiting reliability and stability of the limiting plate 30 are also higher. In the embodiment where the limiting plate 30 is made of a plastic part, the insulating property of the limiting plate 30 is better, which can improve the reliability and the overall cost is lower.

[0187] According to some embodiments of the present application, the limiting plate 30 is configured as a plastic part and has a melting point greater than 300 degrees Celsius.

[0188] That is to say, in the embodiment where the limiting plate 30 is made of a plastic part, the melting point of the plastic part is greater than 300 degrees Celsius, which can reduce the probability of the limiting plate 30 melting and deforming during thermal runaway. When the battery device 100 experiences thermal runaway, the limiting plate 30 can still provide reliable and stable limiting, can also achieve a certain blocking effect on the high-pressure gas and fire flow, and can also reduce the spread speed of thermal runaway.

[0189] According to some embodiments of the present application, the covering shell 22 includes a first plate 221 and second plates 222 located on both sides of the first plate 221, and the second plates 222 are connected to the limiting plate 30.

[0190] Thus, by connecting the second plate 222 to the limiting plate 30, that is, the second plate 222 defines the second side surface 20b and is connected to the limiting plate 30, so that the limiting plate 30 is pushed against the second plate 222 to achieve the limiting of the battery pack 20. On the premise of meeting the limiting effect, during the limiting process, the limiting plate 30 will not directly push against the soft-pack battery cell 21, and the probability of damage to the battery pack 20 can also be reduced, further improving the reliability of the battery device 100.

[0191] Combined Figure 7 and Figure 8 As shown, according to some embodiments of the present application, a pressure relief portion 2211 is formed on the first plate 221, and a weak portion 2113 is formed on the soft-pack battery cell 21, and the weak portion 2113 and the pressure relief portion 2211 are at least partially opposite.

[0192] Specifically, the first plate 221 and the second plates 222 located on both sides of the first plate 221 define a generally U-shaped covering shell 22, so that the first plate 221 of the covering shell 22 can be opposite to a circumferential surface 2112 of the soft-pack battery cell 21, and the two second plates 222 can be respectively opposite to the third side surfaces 2111 on both sides of the soft-pack battery cell 21, and the weak portion 2113 formed on the circumferential surface 2112 can be at least partially opposite to the pressure relief portion 2211 formed on the first plate 221.

[0193] It should be noted that the weak portion 2113 and the pressure relief portion 2211 being at least partially opposite means that the weak portion 2113 formed on the circumferential surface 2112 projects towards the first plate 221, and the projection contour overlaps at least partially with the contour of the pressure relief portion 2211.

[0194] In this way, on the one hand, the gas and fire flow generated after the thermal runaway of the soft-pack battery cell 21 can be discharged in a directional manner, achieving an orderly discharge to reduce damage, especially secondary damage. On the other hand, the communication path between the weak part 2113 and the pressure relief part 2211 is shorter. While enabling rapid discharge, the gas and fire flow stays inside the cladding shell 22 for a shorter time, has less impact on other soft-pack battery cells 21 around the thermally runaway soft-pack battery cell 21, and can further reduce the spread speed of thermal runaway, thereby improving the reliability of the battery pack 20 and the battery device 100.

[0195] According to some embodiments of the present application, the first plate 221 is spaced apart from the side of the circumferential surface 2112 having the weak part 2213 to define an exhaust passage a.

[0196] In this way, the high-temperature gas and fire flow generated after the rupture of the weak part 2113 can be first discharged to the exhaust passage a, and after being preliminarily buffered by passing through the exhaust passage a, it is discharged through the pressure relief part 2211, which can reduce the pressure of the high-temperature gas and fire flow after flowing out of the pressure relief part 2211, so as to reduce the impact and damage after the thermal runaway of the soft-pack battery cell 21.

[0197] According to some embodiments of the present application, the first plate 221 is configured as a flat plate or an arc-shaped plate.

[0198] That is to say, in some embodiments, the first plate 221 is configured as a flat plate, and in other embodiments, the first plate 221 is configured as an arc-shaped plate.

[0199] According to some embodiments of the present application, there are multiple pressure relief parts 2211, and the multiple pressure relief parts 2211 are spaced apart in the length direction and / or width direction of the first plate 221.

[0200] Thereby, each of the multiple weak parts 2113 on each soft-pack battery cell 21 can have a corresponding pressure relief part 2211, so that the high-temperature gas and fire flow buffered by the exhaust passage a can be directly discharged through the corresponding pressure relief part 2211, improving the discharge speed, reducing the residence time of the high-temperature gas and fire flow in the exhaust passage a during the discharge process, so as to reduce the spread speed of thermal runaway between adjacent soft-pack battery cells 21 in the battery pack 20 and improve the reliability of the battery pack 20.

[0201] According to some embodiments of the present application, the cladding shell 22 is configured as an aluminum shell or a stainless steel shell.

[0202] It can be understood that in some embodiments, the encapsulation shell 22 is configured as an aluminum shell, and in other embodiments, the encapsulation shell 22 is configured as a stainless steel shell, so that the temperature resistance performance, structural strength, etc. of the encapsulation shell 22 are much higher than those of the flexible shell. With the encapsulation shell 22 having a certain structural strength and stiffness, it can support and protect the soft-pack battery cell 21 outside the soft-pack battery cell 21, improve the structural strength of the battery pack 20, reduce the thermal runaway spread speed between adjacent battery packs 20, and improve the reliability of the battery device 100.

[0203] Combined with Figure 8 As shown, according to some embodiments of the present application, the box body 10 has a bottom plate 11, and the bottom plate 11 is connected to the second side surface 20b of the soft-pack battery cell 21 and the second plate 222 through an adhesive layer 13.

[0204] Specifically, the bottom plate 11 of the box body 10 is connected to the second side surface 20b of the soft-pack battery cell 21 (i.e., the above-mentioned second surface is formed as the second side surface 20b) and the second plate 222 of the encapsulation shell 22 through the adhesive layer 13 to fix the battery pack 20 on the box body 10 and improve the fixing stability and reliability of the battery pack 20.

[0205] Combined with Figure 8 As shown, according to some embodiments of the present application, the bottom plate 11 includes a cold plate, and the adhesive layer 13 is located between the cold plate and a plurality of soft-pack battery cells 21.

[0206] Among them, in some embodiments, the bottom plate 11 of the box body 10 is formed as a cold plate, and the cold plate is connected to the soft-pack battery cell 21 through the adhesive layer 13. In other embodiments, a cold plate is provided between the bottom plate 11 and the soft-pack battery cell 21, and the cold plate is connected to the soft-pack battery cell 21 through the adhesive layer 13.

[0207] That is to say, the adhesive layer 13 is configured as a structural adhesive, and the bottom plate 11 provided with the cold plate is connected to the soft-pack battery cell 21. On the premise of realizing the stable and reliable fixation of the battery pack 20 in the box body 10, the temperature of the battery pack 20 can also be adjusted through the cold plate, so that the battery pack 20 can work at a suitable temperature, improve the working stability and reliability of the battery pack 20, reduce the probability of overheating of the battery pack 20, and then reduce the probability of thermal runaway of the battery pack 20, thereby improving the reliability of the battery pack 20 and even the battery device 100.

[0208] Such as Figure 8 As shown, according to some embodiments of the present application, the adhesive layer 13 includes: an adhesive layer body 131 and an overflow adhesive part 132. The overflow adhesive part 132 is located on one side of the adhesive layer body 131 facing a plurality of soft-pack battery cells 21, and is located between adjacent soft-pack battery cells 21 and / or between the soft-pack battery cell 21 and the second plate 222.

[0209] That is to say, when the structural adhesive is used to connect and fix the pouch cell monomer 21 and the cold plate, at least part of the adhesive layer 13 overflows between adjacent pouch cell monomers 21 and / or between the second plate 222 and the pouch cell monomer 21, and forms an overflow adhesive part 132. By providing the overflow adhesive part 132, not only can the contact area between the adhesive layer 13 and the pouch cell monomer 21 and between the adhesive layer 13 and the second plate 222 be increased to improve the fixing stability and reliability of the battery pack 20 on the box body 10, but also the gaps between adjacent pouch cell monomers 21 and between the pouch cell monomer 21 and the second plate 222 can be filled by the overflow adhesive part 132 to limit the pouch cell monomer 21 and the coating shell 22, reduce the movement of the battery pack 20 in the box body 10, and reduce the movement of the pouch cell monomer 21 in the coating shell 22.

[0210] As shown in the accompanying drawings, in the battery device 100 according to the embodiment of the present application, the electrode assembly 212 is disposed in the flexible outer shell 211. The flexible outer shell 211 is formed with a weak part 2113 at least on the circumferential surface 2112. The battery pack 20 includes at least one pouch cell monomer 21 according to the embodiment of the present application. At least part of the pressure relief part 2211 on the first plate 221 of the coating shell 22 is directly opposite to the weak part 2113. The second plate 222 is opposite to the third side surface 2111 of the flexible outer shell 211. The bottom plate 11 of the box body 10 is configured as a cold plate, or a cold plate is disposed above the bottom plate 11. The cold plate is connected to the pouch cell monomer 21 through the adhesive layer 13. The overflow adhesive part 132 of the adhesive layer 13 overflows between adjacent pouch cell monomers 21 and / or between the pouch cell monomer 21 and the second plate 222. The top plate 12 and / or the bottom plate 11 of the box body 10 are provided with limiting plates 30. A limiting space is formed between adjacent limiting plates 30. One or more battery packs 20 are disposed in the limiting space.

[0211] According to some embodiments of the present application, the pouch cell monomer 21 is any one of a lithium iron phosphate battery monomer, a ternary lithium battery monomer, and a solid-state battery monomer.

[0212] That is to say, in some embodiments, the pouch cell monomer 21 is configured as a lithium iron phosphate battery. In some embodiments, the pouch cell monomer 21 is configured as a ternary lithium battery monomer. In some embodiments, the pouch cell monomer 21 is configured as a solid-state battery monomer.

[0213] Among them, the solid-state battery monomer can be, but is not limited to, a polymer solid-state battery monomer, an oxide solid-state battery monomer, a sulfide solid-state battery monomer, a halide solid-state battery monomer, and the like. The solid-state battery monomer can also be a semi-solid-state battery monomer or a full-solid-state battery monomer.

[0214] In the above technical solutions, in the embodiment where the present application is configured 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 configured as a ternary lithium battery cell, the energy density of the soft-pack battery cell can be increased and the cruising range can be extended. In the embodiment where the present application is configured as a solid-state soft-pack battery cell, not only the energy density can be increased, but also the reliability can be improved.

[0215] According to some embodiments of the present application, when the soft-pack battery cell 21 is a lithium iron phosphate (LiFeO 4 ) battery cell, in the positive electrode material of the soft-pack battery cell 21, the dosage 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 21 is a ternary lithium battery cell, and in the positive electrode material of the soft-pack battery cell 21, the dosage ratio of the positive electrode active material, the positive electrode binder, and the positive electrode conductive agent is 96: 2-3: 1-2.

[0216] It can be understood that when the soft-pack battery cell 21 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 21, the proportion of the positive electrode active material in the total weight of the positive electrode material is 96 parts, and the proportion of the binder in the total weight of the positive electrode material is 1 to 3 parts (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 proportion of the conductive agent in the total weight of the positive electrode material is 1 to 3 parts (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.).

[0217] Exemplarily, when the soft-pack battery cell 21 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), and the conductive agent can be conductive carbon black. Among them, LFP: PVDF: conductive carbon black can be 96: 2: 2. That is to say, the total weight of the positive electrode active material is divided into 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. Among them, the weight unit of the positive electrode active material can be grams.

[0218] When the soft-pack battery cell 21 is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 21, the proportion of the positive electrode active material in the total weight of the positive electrode material is 96 parts, the proportion of the positive electrode binder in the total weight of the positive electrode material is 2 to 3 parts (for example, it can include but is not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the proportion of the positive electrode conductive agent in the total weight of the positive electrode material is 1 to 2 parts (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but is not limited to lithium nickel cobalt manganese oxide series, lithium nickel cobalt aluminate series, etc.

[0219] Exemplarily, the ternary material of the ternary battery cell can be the eight-series LiNi 0.8 Co 0.1 Mn 0.1 O 2 , and the weight ratio of the positive electrode active material, the binder, and the 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, and the eight-series LiNi 0.8 Co 0.1 Mn 0.1 O 2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0220] In the above technical solution, when the soft-pack battery cell 21 is a lithium iron phosphate battery cell, the high proportion of the positive electrode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within the limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100. As a result, the lithium iron phosphate battery cell can output a higher amount of electricity when its volume and weight are relatively small, meeting the application scenarios with certain requirements for energy density. Using the above ranges for the amounts of the binder and the conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 21 is a ternary battery cell, due to the relatively complex structure and surface properties of the ternary material itself, using the above dosage ratios of the positive electrode active material, the binder, and the conductive agent is beneficial to ensuring good adhesion 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, reducing the risk of shedding of the active material and electrode pulverization during charge and discharge, and extending the cycle life of the battery device 100.

[0221] As Figure 1 shown, the present application provides an electrical device 200, including: the battery device 100 in the above embodiment.

[0222] Furthermore, as Figure 1 shown, the electrical device 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. Furthermore, the top plate 12 of the box 10 can be used to define the vehicle floor, which can eliminate the meaningless stacking of multiple layers of plates, reduce the material cost, and make the space occupied by the chassis more reasonable. The space inside the chassis for accommodating the battery device 100 is larger and the energy density is higher.

[0223] It can be understood that the electrical device 200 is configured as a vehicle, that is, the vehicle adopts the above battery device 100. The battery device 100 has a higher energy density and higher reliability, which can improve the driving range of the vehicle and also improve the driving safety of the vehicle.

[0224] For those of ordinary skill in the art, the other configurations and operations of the pouch cell monomer 21, the battery device 100, and the electrical device 200 according to the embodiments of the present invention are known and will not be described in detail here.

[0225] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0226] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box body (10), wherein the box body (10) has a receiving cavity; A plurality of battery packs (20), the battery packs (20) being arranged in the accommodating cavity, and each of the battery packs (20) comprising a plurality of soft-pack battery cells (21), and a first side surface (20a) of the battery pack (20) being connected to the box body (10); a limiting plate (30), the limiting plate (30) being connected to at least the second side surface (20b) of the battery pack (20) and connected to the box body (10); The first side surface (20a) and the second side surface (20b) are different sides of the battery pack (20).

2. The battery device according to claim 1, characterized in that: There are a plurality of limit plates (30), and the plurality of limit plates (30) are arranged at intervals in the arrangement direction of the battery packs (20), and limit spaces are defined between adjacent limit plates (30) and between the limit plates (30) and the box body (10), and at least one battery pack (20) is arranged in each limit space.

3. The battery device according to claim 2, characterized in that: One to three battery packs (20) are arranged in each of the limiting spaces.

4. The battery device according to claim 1, characterized in that: The box body (10) comprises a bottom plate (11) for carrying the battery pack (20) and a top plate (12) opposite to the bottom plate (11), and the battery pack (20) is connected to the bottom plate (11).

5. The battery device according to claim 4, characterized in that: The limiting plate (30) is arranged on the bottom plate (11), and / or the limiting plate (30) is arranged on the top plate (12).

6. The battery device according to claim 5, characterized in that: The limiting plate (30) comprises: a first limiting plate (31) and a second limiting plate (32); the first limiting plate (31) is arranged on the bottom plate (11); the second limiting plate (32) is arranged on the top plate (12); and the first limiting plate (31) and the second limiting plate (32) are arranged opposite to each other.

7. The battery device according to claim 1, characterized in that: The soft-pack battery cell (21) comprises: a flexible shell (211) and an electrode assembly (212) arranged in the flexible shell (211); the flexible shell (211) has a third side surface (2111) opposite to a large surface of the electrode assembly (212), and a circumferential surface (2112) avoiding the large surface; the circumferential surface (2112) and the third side surface (2111) are connected circumferentially around the electrode assembly (212); the limiting plate (30) is opposite to the third side surface (2111); and the surface area of ​​the opposite side of the limiting plate (30) and the third side surface (2111) is less than or equal to the surface area of ​​the third side surface (2111).

8. The battery device according to claim 7, characterized in that: The length dimension of the limiting plate (30) is less than or equal to the length dimension of the third side surface (2111), and / or the width dimension of the limiting plate (30) is less than or equal to the width dimension of the third side surface (2111).

9. The battery device according to claim 7, characterized in that: The surface area of ​​the side opposite to the limiting plate (30) and the battery pack (20) is S1, the surface area of ​​the side opposite to the battery pack (20) and the limiting plate (30) is S2, and the following relationship is satisfied: 0.5≤S1 / S2≤1.

10. The battery device according to claim 1, characterized in that: The size of the limiting plate (30) in the arrangement direction of the battery pack (20) is 1 mm to 3 mm.

11. The battery device according to claim 1, characterized in that: The limiting plate (30) is constructed of any one of a metal material piece and a plastic material piece.

12. The battery device according to claim 11, characterized in that: The limiting plate (30) is constructed as a plastic part, and has a melting point greater than 300 degrees Celsius.

13. The battery device according to claim 1, characterized in that: The battery pack (20) further comprises a covering shell (22), wherein the covering shell (22) covers the soft-pack battery cell (21), and the covering shell (22) comprises a first plate (221) and second plates (222) located on both sides of the first plate (221), wherein the second plate (222) is connected to the limiting plate (30).

14. The battery device according to claim 13, characterized in that: A pressure relief portion (2211) is formed on the first plate (221), and a weak portion (2213) is formed on the soft-pack battery cell (21), wherein the weak portion (2213) is at least partially opposite to the pressure relief portion (2211).

15. The battery device according to claim 14, characterized in that: The first plate (221) is spaced apart from a side of the soft-pack battery cell (21) having the weak portion (2213) to define a venting channel (a).

16. The battery device according to claim 13, characterized in that: The first plate (221) is configured as a straight plate or a curved plate.

17. The battery device according to claim 14, characterized in that: There are a plurality of pressure relief portions (2211), and the plurality of pressure relief portions (2211) are arranged at intervals in the length direction and / or the width direction of the first plate (221).

18. The battery device according to claim 13, characterized in that: The covering shell (22) is constructed as an aluminum shell or a stainless steel shell.

19. The battery device according to claim 13, characterized in that: The box body (10) comprises a bottom plate (11), and the bottom plate (11) is connected to the second plate (222) and the first side surface (20a) via an adhesive layer (13).

20. The battery device according to claim 19, characterized in that The bottom plate (11) comprises a cold plate, and the adhesive layer (13) is located between the cold plate and the plurality of soft-pack battery cells (21).

21. The battery device according to claim 19, characterized in that The glue layer (13) comprises: a glue layer body (131) and a glue overflow portion (132); the glue overflow portion (132) is located on a side of the glue layer body (131) facing the plurality of soft-pack battery cells (21), and is located between adjacent soft-pack battery cells (21), and / or between the soft-pack battery cells (21) and the second plate (222).

22. The battery device according to any one of claims 1 to 21, characterized in that: The soft-pack battery cell (21) is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell and a solid-state battery cell.

23. An electrical equipment, characterized in that: include: The battery device according to any one of claims 1 to 22.

24. The electrical equipment according to claim 23, wherein: The electrical equipment is a vehicle.

25. The electrical equipment according to claim 24, wherein: The battery device is integrated into the chassis of the vehicle, and the top plate (12) of the box (10) participates in defining the vehicle body floor.

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