Battery device and electric device

Abstract

The utility model relates to the technical field of batteries and discloses a battery device and a power utilization device.The battery device comprises a box body, a battery pack and a protection part, the battery pack is arranged in the box body and comprises a U-shaped shell and a plurality of soft package battery monomers, and the soft package battery monomers are arranged side by side; the U-shaped shell wraps the plurality of soft package battery monomers around three of the four circumferential sides of the plurality of soft package battery monomers, the remaining side of the four circumferential sides of the plurality of soft package battery monomers is exposed through the open end of the U-shaped shell, and the protective part wraps the end part of the U-shaped shell around the edge of each wall body in the circumferential direction of the open end of the U-shaped shell; and the U-shaped shell is arranged between the wall body and the box body and between the end part of the U-shaped shell and the soft package battery monomer. Therefore, the protection piece can separate the end part of the U-shaped shell from the soft package battery monomer, so that the possibility that the soft package battery monomer is scratched by burrs at the end part of the U-shaped shell in the assembling process of the battery device is reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device and an electrical device. Background Art

[0002] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, the battery device, as the power source of the electric vehicle, plays an irreplaceable and important role. Among them, the soft-pack battery cell has been widely used due to its unique structure and advantages. However, the reliability of the battery device with soft-pack battery cells needs to be further improved. Summary of the Utility Model

[0003] The present application provides a battery device and an electrical device. By using a protective member to separate the end of the U-shaped housing from the soft-pack battery cell, it is convenient to reduce the possibility that the burrs at the end of the U-shaped housing scratch the soft-pack battery cell during the assembly process of the battery device, thereby improving the product quality and reliability of the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery device, including: a box body, a battery pack, and a protective member. The battery pack is disposed in the box body, and the battery pack includes a U-shaped housing and a plurality of soft-pack battery cells. The plurality of soft-pack battery cells are arranged side by side. The U-shaped housing wraps the plurality of soft-pack battery cells around three of the four circumferences of the plurality of soft-pack battery cells. The remaining one of the four circumferences of the plurality of soft-pack battery cells is exposed through the open end of the U-shaped housing and is bonded to the box body through the open end. The protective member wraps the edge of each wall body of the circumference of the open end of the U-shaped housing to cover the end of the U-shaped housing, and the protective member is located between the wall body and the box body and between the end of the U-shaped housing and the soft-pack battery cell.

[0005] In the above technical solution, the protective member can cover the end of the open end of the U-shaped housing. The U-shaped housing is used to place a plurality of soft-pack battery cells. When assembling the plurality of soft-pack battery cells through the open end of the U-shaped housing, the protective member can effectively separate the end of the open end of the U-shaped housing from the soft-pack battery cell, so as to reduce the possibility that the burrs at the end scratch the soft-pack battery cell, thereby improving the product quality and reliability of the battery device.

[0006] In some embodiments, the open end is located at one end of the U-shaped housing in a first direction. The plurality of soft-pack battery cells are arranged in sequence in a second direction. Protective members are respectively provided on both sides of the open end in the second direction. The size of the U-shaped housing in a third direction is greater than its size in the first direction and its size in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0007] In the above technical solution, the size of the U-shaped housing in the third direction is greater than its sizes in the first direction and the second direction. The open end is located at one end of the U-shaped housing in the first direction, and protective members are respectively provided on both sides of the open end in the second direction. That is, multiple soft-pack battery monomers arranged along the second direction can be assembled from the open end of the U-shaped housing in the first direction, which is convenient for simplifying the assembly process of the battery device and is beneficial to further reducing the risk of burrs on the U-shaped housing scratching the soft-pack battery monomers.

[0008] In some embodiments, both ends of multiple U-shaped housings in the third direction respectively extend beyond the encapsulation film of the soft-pack battery monomers.

[0009] In the above technical solution, the size of the U-shaped housing in the third direction is greater than the size of the soft-pack battery monomer in the third direction, which is convenient for reducing the possibility of burrs at the ends of the U-shaped housing in the third direction from scratching the soft-pack battery monomers.

[0010] In some embodiments, both ends of the protective member in the third direction are respectively flush with the two ends of the U-shaped housing, or both ends of the protective member in the third direction respectively extend beyond the corresponding two ends of the U-shaped housing.

[0011] In the above technical solution, both ends of the protective member in the third direction are respectively flush with the two ends of the U-shaped housing, that is, the size of the protective member in the third direction is greater than the size of the soft-pack battery monomer in the third direction. When multiple soft-pack battery monomers are assembled from the open end of the U-shaped housing in the first direction, the protective member can isolate the end of the U-shaped housing in the second direction from the soft-pack battery monomers, which is convenient for improving the reliability of the battery device, or the size of the protective member in the third direction is greater than the size of the U-shaped housing in the third direction to further reduce the possibility of burrs at the end of the U-shaped housing in the second direction from scratching the soft-pack battery monomers.

[0012] In some embodiments, the protective member includes a connected first protective portion and a second protective portion. The first protective portion is provided on the inner wall of the U-shaped housing, and the second protective portion extends out of the U-shaped housing from the first protective portion and covers the end face of the U-shaped housing corresponding to the open end.

[0013] In the above technical solution, the first protective portion and the second protective portion at least cover the corner positions where the open end is assembled with the soft-pack battery monomer, so as to reduce the possibility of burrs at the open end from scratching the soft-pack battery monomers and improve the reliability of the battery device.

[0014] In some embodiments, the second protective portion also covers the side surface of the U-shaped housing facing away from the soft-pack battery monomer inside it, so that the protective member defines a groove, and the edge of the U-shaped housing corresponding to the open end is inserted into the groove.

[0015] In the above technical solution, the protective member defines a groove, and the staff can insert the edge of the open end of the U-shaped housing into the groove, which is convenient for reducing the assembly difficulty of the U-shaped housing and the protective member.

[0016] In some embodiments, the thickness of the portion of the U-shaped housing that cooperates with the groove decreases in the direction towards the bottom wall of the groove.

[0017] In the above technical solution, since the thickness of the portion of the U-shaped housing that cooperates with the groove decreases in the direction towards the bottom wall of the groove, the reduced thickness portion of the U-shaped housing can serve as a guiding structure, making it easier for the components to be inserted and aligned during installation, and improving the installation efficiency of the U-shaped housing and the protective member.

[0018] In some embodiments, the open end is located at one end of the U-shaped housing in the first direction, and the height of the first protective portion in the first direction remains unchanged along the length direction of the protective member; or, the height of the first protective portion in the first direction first decreases and then increases along the length direction of the protective member, and the position where the height of the first protective portion is the smallest is located in the middle of the first protective portion in the length direction, and the length direction of the protective member is perpendicular to the first direction.

[0019] In the above technical solution, the burrs at the ends of the open end are mainly located at both ends of the U-shaped housing in the length direction. By configuring the first protective portion such that the height of the first protective portion in the first direction first decreases and then increases along the length direction of the protective member, the burrs existing at both ends of the open end in the length direction can be effectively separated from the soft-pack battery cell, so that the burrs existing at both ends of the open end in the length direction are not likely to scratch the soft-pack battery cell, and at the same time, the material usage of the protective member is reduced.

[0020] In some embodiments, the open end is located at one end of the U-shaped housing in the first direction, and the first protective portion includes a first part and a second part that are spaced apart along the length direction of the protective member. The first part and the second part are respectively located at both ends of the inner wall of the U-shaped housing in the length direction, and both are located on both sides of the middle of the first protective portion in the length direction.

[0021] In the above technical solution, the first part and the second part of the first protective portion are respectively located at both ends of the inner wall of the U-shaped housing in the length direction, so as to separate both ends of the open end in the length direction from the soft-pack battery cell, facilitating the reduction of the possibility that the burrs existing at both ends of the open end in the length direction scratch the soft-pack battery cell, and at the same time further reducing the material usage of the protective member.

[0022] In some embodiments, the distance between the first part and the second part in the length direction is x, the occupied length of the first protective portion in the length direction is L, and x / L ≤ 1 / 3.

[0023] In the above technical solution, the ratio of the length of the portion of the first protective part that does not fit the inner wall of the U-shaped housing to the length of the first protective part is less than or equal to 1 / 3, so that the first protective part can fully cover most areas at both ends of the open end, and at the same time can reduce unnecessary material waste.

[0024] In some embodiments, the first protective part further includes a third part connected between the first part and the second part. In the first direction, the height of the first part and the height of the second part are both greater than the height of the third part.

[0025] In the above technical solution, the first part, the second part, and the third part are all arranged on the inner wall of the U-shaped housing to reduce the possibility that the burrs at the end of the open end scratch the soft-pack battery cell. In the first direction, the height of the first part and the height of the second part are both greater than the height of the third part, so that the protective part has a good protective effect while reducing the material consumption of the protective part.

[0026] In some embodiments, both ends of the U-shaped housing are open in the third direction, and the second protective part also covers the end faces of both ends of the U-shaped housing in the third direction, so that both ends of the groove are closed in the third direction.

[0027] In the above technical solution, the second protective part also covers the end faces of both ends of the U-shaped housing in the third direction to separate the end faces of both ends of the U-shaped housing in the third direction from the soft-pack battery cell, which is convenient for reducing the possibility that the burrs on the end faces of both ends of the U-shaped housing in the third direction scratch the soft-pack battery cell and improving the reliability of the battery device.

[0028] In some embodiments, the open end is located at one end of the U-shaped housing in the first direction, and the maximum height in the first direction of the part of the protective part extending into the U-shaped housing through the open end satisfies 3mm ≤ H ≤ 5mm; and / or, the thickness of the protective part satisfies 1mm ≤ t ≤ 2mm.

[0029] In the above technical solution, by setting the maximum height of the protective part within the range of 3mm to 5mm, while meeting the protection performance, the height of the protective part can be minimized as much as possible, thereby saving the space occupied by the protective part and facilitating the miniaturization design of the battery device; and / or, by setting the thickness of the protective part within the range of 1mm to 2mm, while meeting the protection performance, the thickness of the protective part can be minimized as much as possible, thereby saving the space occupied by the protective part and facilitating the miniaturization design of the battery device.

[0030] In some embodiments, if the volume energy density ρ of the soft-pack battery cell satisfies ρ ≤ 390Wh / L, then the melting point T of the protective part satisfies 150℃ ≤ T < 200℃; if the volume energy density ρ of the soft-pack battery cell satisfies ρ > 390Wh / L, then the melting point T of the protective part satisfies T ≥ 200℃.

[0031] In the above technical solution, by setting the melting point of the protective member and the energy density of the soft-pack battery cell within the above ranges, the protective member can have appropriate high-temperature resistance, improving the reliability of the protective member. Thereby, the reliability of the battery device can be improved, and the cost of the protective member can be taken into account, which is beneficial to reducing the cost of the battery device.

[0032] In some embodiments, the protective member is a high-temperature resistant insulating material member.

[0033] In the above technical solution, by setting the protective member as a high-temperature resistant insulating material member, it is convenient to improve the service life of the protective member and the electrical insulation property, reducing the risk of short circuit between the soft-pack battery cell and the U-shaped housing or other metal components.

[0034] In some embodiments, the protective member is a polypropylene member, a polyethylene terephthalate member, or a polyimide member.

[0035] In the above technical solution, these materials not only have excellent high-temperature resistance and can remain stable in the high-temperature environment generated during the operation of the battery, but also have good electrical insulation characteristics, can effectively isolate the current, and further reduce the risk of battery short circuit.

[0036] In some embodiments, the protective member fills the gap between the soft-pack battery cell adjacent to the inner wall of the U-shaped housing and the inner wall of the U-shaped housing.

[0037] In the above technical solution, the protective member fills the gap between the soft-pack battery cell and the U-shaped housing, making the position of the soft-pack battery cell in the U-shaped housing more stable, reducing the relative movement of the soft-pack battery cell in the U-shaped housing due to external vibration or impact, thereby improving the stability and durability of the battery device.

[0038] In some embodiments, the protective member is adhesively bonded to the soft-pack battery cell adjacent to the inner wall of the U-shaped housing.

[0039] In the above technical solution, the adhesive bonding method can provide a strong adhesive force, forming a tight and firm connection between the protective member and the soft-pack battery cell, helping to reduce the possibility of relative movement or loosening between the protective member and the battery cell under external vibration or impact.

[0040] In some embodiments, the battery device further includes an adhesive member, the adhesive member is provided at the open end of the U-shaped housing and closes the open end, and the elastic modulus of the protective member is less than the elastic modulus of the adhesive member.

[0041] In the above technical solution, the bonding member closes the open end of the U-shaped housing, providing a relatively stable working environment for the operation of the soft-pack battery cell. At the same time, the bonding member facilitates the assembly of the U-shaped housing with other devices. The elastic modulus of the protective member is less than that of the bonding member. When the bonding member closes the open end, the adhesive liquid is not likely to leak into the gap between the protective member and the soft-pack battery cell to form a hard structure. The soft-pack battery cell directly contacts the protective member with a smaller elastic modulus inside the U-shaped housing. When subjected to external mechanical shocks or vibrations, the protective member can more effectively absorb and disperse stress, facilitating the improvement of the reliability of the battery device.

[0042] In some embodiments, the open end is located at one end of the U-shaped housing in the first direction. The battery packs are multiple groups, and the multiple groups of battery packs are arranged in sequence in the second direction and the open ends of the multiple groups of battery packs are arranged on the same side. The second direction is perpendicular to the first direction, and protective members are respectively provided on both sides in the second direction of each of the two adjacent groups of battery packs.

[0043] In the above technical solution, the open ends of the multiple groups of battery packs are arranged on the same side, facilitating the simplification of the assembly process of the soft-pack battery cell and the U-shaped housing. The open ends are arranged on the same side, and protective members are respectively provided on both sides in the second direction of each of the two adjacent groups of battery packs along the second direction, so that burrs existing at the ends of the open ends are not likely to scratch the soft-pack battery cell during the assembly process, facilitating the improvement of the reliability of the battery device.

[0044] In some embodiments, the protective members adjacent to each other on one side of two adjacent groups of battery packs are shared.

[0045] In the above technical solution, sharing the protective members facilitates reducing the number of protective members used, and the shared protective members can connect two adjacent groups of battery packs, making the installation positions of the two groups of battery packs more stable.

[0046] In some embodiments, the U-shaped housings of two adjacent groups of battery packs are split parts or integral parts.

[0047] In the above technical solution, the split U-shaped housing can allow for more flexible adjustment of the battery packs during the assembly process according to the differences in the actual installation space or the dimensions of the battery packs. The integral U-shaped housing can form a more solid overall structure during the manufacturing process, contributing to the improvement of the overall structural strength and durability of the battery device.

[0048] In some embodiments, the battery device further includes at least one of a first heat exchange member and a second heat exchange member. At least one of the first heat exchange member and the second heat exchange member is used for heat exchange with the soft-pack battery cell. The first heat exchange member is provided between the U-shaped housings of two adjacent groups of battery packs, and the second heat exchange member is provided between the battery pack and the box body.

[0049] In the above technical solution, the first heat exchanger is arranged between the U-shaped casings of two adjacent battery packs for heat exchange between the two adjacent battery packs, so that the operating temperatures of multiple battery packs can be maintained within a relatively uniform range, facilitating the improvement of the operating stability of the battery device. The second heat exchanger is arranged between the battery pack and the box body, facilitating the transfer of the heat generated by the battery pack outside the box body, further enhancing the thermal management ability of the battery device.

[0050] In some embodiments, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0051] In the above technical solution, using the above types of soft-pack battery cells can provide more choices for the design of the battery device to meet different usage requirements. Among them, when the soft-pack battery cell is a lithium iron phosphate battery cell, it has the advantages of high reliability, long cycle life, light weight, large capacity, and small internal resistance; when the soft-pack battery cell is a ternary battery cell, it has the advantages of high energy density and good electrochemical performance; when the soft-pack battery cell is a solid-state battery cell, it has the advantages of high energy density, high reliability, light weight, and good high and low temperature performance.

[0052] In some embodiments, the soft-pack battery cell is a ternary battery cell, and a pressure relief portion is provided on the casing wall of the U-shaped casing opposite to the open end.

[0053] In the above technical solution, the pressure relief portion can guide the discharged gas to relieve pressure in a specific direction when the ternary battery cell undergoes thermal runaway and expands to exhaust and relieve pressure, reducing the risk of the discharged gas affecting the surrounding ternary battery cells due to random movement, and thus reducing the risk of serious thermal runaway of the battery pack composed of ternary battery cells, which is beneficial to the thermal runaway management of the battery pack and improves the reliability of the battery pack composed of ternary battery cells.

[0054] In some embodiments, the pressure relief portion is configured as a pressure relief hole; alternatively, the pressure relief portion is configured as a notch; alternatively, the pressure relief portion is configured as a weakened portion.

[0055] In the above technical solution, the pressure relief portion has multiple different types, which can provide more choices for the design of the pressure relief portion to meet different usage requirements.

[0056] In a second aspect, an electrical device provided by an embodiment of the present application includes the battery device of the first aspect.

[0057] In the above technical solution, since the battery device has good reliability, using this battery device can improve the power consumption reliability of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0059] Figure 1 The structural schematic diagram of the power consumption device provided for some embodiments of this application is for a vehicle;

[0060] Figure 2 The structural explosion diagram of the battery device provided for some embodiments of this application;

[0061] Figure 3 The schematic diagram of the battery pack provided for some embodiments of this application;

[0062] Figure 4 The schematic diagram of the protective member provided for some embodiments of this application. The dashed line in the figure is only used to schematically show the separation between the first protective part and the second protective part;

[0063] Figure 5 The schematic diagram of the protective member provided for some embodiments of this application;

[0064] Figure 6 The schematic diagram of the protective member provided for some embodiments of this application;

[0065] Figure 7 The schematic diagram of the protective member provided for some embodiments of this application;

[0066] Figure 8 The schematic diagram of the protective member provided for some embodiments of this application;

[0067] Figure 9 The schematic diagram of the protective member provided for some embodiments of this application;

[0068] Figure 10 For Figure 3 Another schematic diagram of the protective member shown in

[0069] Figure 11 The structural explosion diagram of the battery device provided for another embodiment of this application;

[0070] Figure 12 For Figure 11 The schematic diagram of multiple battery packs shown in

[0071] Figure 13 For Figure 11 Another schematic diagram of multiple battery packs shown in

[0072] Reference numerals:

[0073] Battery device 1, power-consuming device 2, battery pack 10, U-shaped housing 12, open end 120, end 122, inner wall 124, first wall portion 127, second wall portion 128, third wall portion 129, pouch cell 14, protective member 20, first protective portion 22, second protective portion 24, groove 26, first portion 27, second portion 28, third portion 29, bonding member 30, box body 40, accommodation cavity 42, first box body 44, second box body 46, first heat exchanger 50, second heat exchanger 52, pressure relief portion 54, controller 60, motor 62. Detailed implementation manners

[0074] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of the present application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims or drawings of the present application are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0076] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0077] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "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 the present application can be understood according to specific situations.

[0078] In this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0079] In the embodiments of this application, the same reference numerals represent the same components. 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 are only for illustrative purposes and should not constitute any limitation to this application.

[0080] The term "a plurality of" as used in this application refers to two or more (including two).

[0081] In this application, the battery cell may include 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., and the embodiments of this application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of this application are also not limited thereto.

[0082] The battery apparatus mentioned in the embodiments of this application may refer to an apparatus including one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly 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 busbar component. In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0083] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0084] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body. As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body. As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0085] The battery cell includes a housing, an electrode assembly, and an electrolyte. The housing is used to accommodate the electrode assembly and the electrolyte. In the present application, a soft-pack battery cell may refer to a battery cell that uses a soft outer packaging material as the housing. For example, the encapsulation film described herein may be used as the housing of the soft-pack battery cell. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that a large current can pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0086] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0087] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, the battery, as the power source of the electric vehicle, plays an irreplaceable and important role. At present, the reliability of the battery needs to be further improved.

[0088] In a general battery device, during production and assembly, multiple soft-pack monomers are usually loaded side by side through the open end of the housing to form a battery pack, and then multiple battery packs are fixed in a box to form a battery device. However, due to the limitations of the housing manufacturing process, there are often some inevitable problems with the housing. For example, there are burrs at the end of the open end of the housing. When the soft-pack battery cell is loaded through the open end of the housing, the burrs at the end of the open end are likely to scratch the soft-pack battery cell, resulting in the problem of electrolyte leakage, which in turn causes the problem of insulation failure of the battery device and affects the reliability of the battery device.

[0089] Based on the above considerations, in order to solve the reliability problem of the soft-pack battery cells during the assembly process of the battery device, which in turn affects the overall reliability of the battery device. The present application designs a battery device, including: a box body, a battery pack, and a protective member. The battery pack is arranged inside the box body, and the battery pack includes a U-shaped housing and a plurality of soft-pack battery cells. The plurality of soft-pack battery cells are arranged side by side. The U-shaped housing wraps the plurality of soft-pack battery cells around three of the four circumferences of the plurality of soft-pack battery cells. The remaining one of the four circumferences of the plurality of soft-pack battery cells is exposed through the open end of the U-shaped housing, and is adhered to the box body through the open end. The protective member wraps the edge of each wall body of the circumference of the open end of the U-shaped housing to cover the end of the U-shaped housing, and the protective member is located between the wall body and the box body, and is located between the end of the U-shaped housing and the soft-pack battery cells.

[0090] In the above technical solution, the protective member can cover the end of the open end of the U-shaped housing. The U-shaped housing is used to place a plurality of soft-pack battery cells. When assembling the plurality of soft-pack battery cells through the open end of the U-shaped housing, the protective part can effectively separate the end of the open end of the U-shaped housing from the soft-pack battery cells, so as to reduce the possibility of the burrs at the end scratching the soft-pack battery cells, thereby improving the reliability of the battery device.

[0091] The battery device disclosed in the embodiments of the present application can be used but is not limited to power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery device disclosed in the present application.

[0092] The embodiments of the present application provide a power-consuming device using the battery device as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0093] For the convenience of description, the following embodiments take a power-consuming device 2 of an embodiment of the present application as a vehicle as an example for description. Please refer to Figure 1 , Figure 1The structural schematic diagram of the power consumption device 2 provided by some embodiments of the present application is for a vehicle. 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, an extended-range vehicle, etc. A battery device 1 is disposed inside the vehicle. The battery device 1 can be arranged at the bottom, head, or tail of the vehicle. The battery device 1 can be used for power supply of the vehicle. For example, the battery device 1 can be used as the operating power source of the vehicle. The vehicle may further include a controller 60 and a motor 62. The controller 60 is used to control the battery device 1 to supply power to the motor 62. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle.

[0094] In some embodiments of the present application, the battery device 1 can not only be used 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.

[0095] Please refer to Figure 2 , Figure 2 The structural explosion diagram of the battery device 1 provided by some embodiments of the present application. The battery device 1 includes a box body 40 and a plurality of battery cells. The battery cells are used to be accommodated in the box body 40. Among them, the box body 40 is used to provide an assembly space for the battery cells, and the box body 40 can adopt various structures. In some embodiments, the box body 40 may include a first box body 44 and a second box body 46. The first box body 44 and the second box body 46 cover each other, and the first box body 44 and the second box body 46 jointly define an assembly space for accommodating the battery cells. The second box body 46 can be a hollow structure with one end open, and the first box body 44 can be a plate-like structure. The first box body 44 covers the open side of the second box body 46 so that the first box body 44 and the second box body 46 jointly define the assembly space; the first box body 44 and the second box body 46 can also both be hollow structures with one side open, and the open side of the first box body 44 covers the open side of the second box body 46. Of course, the box body 40 formed by the first box body 44 and the second box body 46 can be of various shapes, such as a cylinder, a cuboid, etc.

[0096] In the battery device 1, the plurality of battery cells can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells. The plurality of battery cells can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells is accommodated in the box body 40; of course, the battery device 1 can also be that a plurality of battery cells are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 40. The battery device 1 may further include other structures. For example, the battery device 1 may further include a busbar component for realizing the electrical connection among the plurality of battery cells. Exemplarily, the battery cell can be a soft-pack battery cell 14.

[0097] Please refer toFigure 2 , Figure 2 Exploded view of the structure of the battery device 1 provided by some embodiments of the present application. The battery device 1 includes multiple rows of battery cells, and the multiple rows of battery cells are arranged along the length direction of the box body 40. Each row of battery cells includes multiple battery cells arranged along the width direction of the box body 40; alternatively, the multiple rows of battery cells are arranged along the width direction of the box body 40, and each row of battery cells includes multiple battery cells arranged along the length direction of the box body 40.

[0098] Among them, each battery cell can be a secondary battery or a primary battery. Among them, a secondary battery refers to a battery cell that can be activated by charging after the battery cell discharges and can continue to be used; it can also 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 the present application do not limit this. The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. Exemplarily, in Figure 2 , the shape of the battery cell is a cuboid.

[0099] Please refer to Figure 3 and Figure 11 , in the embodiments of the present application, the battery device 1 includes: a box body 40, a battery pack 10 and a protective member 20. The battery pack 10 is arranged in the box body 40, and the battery pack 10 includes a U-shaped housing 12 and multiple soft-pack battery cells 14. The multiple soft-pack battery cells 14 are arranged side by side. The U-shaped housing 12 wraps around three of the four circumferences of the multiple soft-pack battery cells 14, and the remaining one of the four circumferences of the multiple soft-pack battery cells 14 is exposed through the open end 120 of the U-shaped housing 12, and the multiple soft-pack battery cells 14 are bonded to the box body 40 through the open end. The protective member 20 wraps around the edge of each wall body of the circumference of the open end 120 of the U-shaped housing 12 to cover the end 122 of the U-shaped housing 12, and the protective member 20 is located between the wall body and the box body 40 and between the end 122 of the U-shaped housing 12 and the soft-pack battery cell 14.

[0100] It can be seen that the box body 40 has an accommodation cavity 42 for accommodating the battery pack 10. By arranging the battery pack 10 in the accommodation cavity 42, the accommodation cavity 42 provides a relatively closed environment for the battery pack 10, so that the battery pack 10 is not easily interfered by the external environment during operation; the U-shaped housing 12 is used to accommodate multiple soft-pack battery cells 14 arranged side by side. The U-shaped housing 12 wraps around three of the four circumferences of the multiple soft-pack battery cells 14, then the U-shaped housing 12 can wrap around three faces of the multiple soft-pack battery cells 14, that is, the multiple soft-pack battery cells 14 arranged side by side can be loaded into the U-shaped housing 12 through the open end 120 of the U-shaped housing 12, which is convenient for simplifying the assembly process of the battery pack 10.

[0101] Among them, a plurality of pouch battery cells 14 are bonded to the box body 40 through the open ends 120, so that the installation positions of the plurality of pouch battery cells 14 in the U-shaped housing 12 are more stable, reducing the possibility of relative movement of the pouch battery cells 14 in the U-shaped housing 12 due to external vibration or impact, thereby improving the stability and durability of the battery device 1.

[0102] In addition, the protective member 20 wraps around the edge of each wall body in the circumferential direction of the open end 120 of the U-shaped housing 12 to cover the end portion 122 of the U-shaped housing 12, and the protective member 20 is located between the end portion of the U-shaped housing 12 and the pouch battery cell 14. Then, the protective member can separate the end portion 122 of the U-shaped housing 12 from the pouch battery cell 14. Due to limitations in the manufacturing process of the U-shaped housing 12, there are usually machining burrs at the end portion 122 of the U-shaped housing 12. By providing the protective member 20 to separate the pouch battery cell 14 from the end portion 122 of the open end 120 of the U-shaped housing 12, during the assembly process of the battery pack 10, the protective member 20 can play a blocking role to separate the burrs at the end portion 122 of the U-shaped housing from the pouch battery cell 14. The burrs existing at the end portion 122 of the U-shaped housing 12 are not likely to pierce through the protective member 20 to scratch the pouch battery cell 14, playing a role in protecting the pouch battery cell 14, reducing the risk of the pouch battery cell 14 being punctured and damaged, enabling the pouch battery cell 14 to maintain good use reliability, and preventing the electrolyte from leaking from the pouch battery cell 14, which is convenient for improving the reliability of the battery device 1. Among them, the protective member 20 is also located between the wall body and the box body 40, so that the open end 120 of the U-shaped housing 12 and the box body 40 are not likely to interfere with each other, making the structure of the U-shaped housing 12 more stable and facilitating the improvement of the stability of the battery device 1.

[0103] Exemplarily, the U-shaped housing 12 includes a first wall portion 127, a second wall portion 128, and a third wall portion 129. The first wall portion 127 and the third wall portion 129 are disposed opposite to each other. The two ends of the second wall portion 128 are bent and connected to the first wall portion 127 and the third wall portion 129 respectively, so that the U-shaped housing 12 forms an open end 120. Workers can load a plurality of side-by-side soft-pack battery cells 14 into the U-shaped housing 12 through the open end 120 of the U-shaped housing 12. At the same time, the second wall portion 128 is disposed opposite to the open end 120, and protective members 20 are respectively provided corresponding to the first wall portion 127 and the third wall portion 129. The protective members 20 can prevent the soft-pack battery cells 14 from directly contacting the end portion 122 of the open end 120, so that the battery pack 10 has better product quality and is convenient for improving the reliability of the battery device 1. For example, for the protective member 20 corresponding to the first wall portion 127, the protective member 20 is located between the first wall portion 127 and the box body 40 and between the inner surface of the first wall portion 127 and the soft-pack battery cell 14. Similarly, for the protective member 20 corresponding to the third wall portion 129, the protective member 20 is located between the third wall portion 129 and the box body 40 and between the inner surface of the third wall portion 129 and the soft-pack battery cell 14.

[0104] Please refer to Figure 3 and Figure 11 , in some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction (such as the AA' direction in Figure 3 ). A plurality of soft-pack battery cells 14 are arranged in sequence in the second direction (such as the BB' direction in Figure 3 ). Protective members 20 are respectively provided on both sides of the open end 120 in the second direction. The dimension of the U-shaped housing 12 in the third direction (such as the CC' direction in Figure 11 ) is greater than its dimension in the first direction and its dimension in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0105] It can be seen that the open end 120 is located at one end of the U-shaped housing 12 in the first direction, and protective members 20 are respectively provided on both sides of the open end 120 in the second direction. Then, the staff can assemble multiple soft-pack battery monomers 14 arranged in the second direction into the U-shaped housing 12 together through the open end 120 of the U-shaped housing 12 in the first direction. Compared with the method of sequentially assembling multiple soft-pack battery monomers one by one, the above solution of the present application is convenient for improving the assembly efficiency of the battery pack 10; at the same time, the protective members 20 are arranged on both sides of the open end 120 in the second direction, which helps to protect the soft-pack battery monomers 14 from being damaged during the assembly process. The size of the U-shaped housing 12 in the third direction is larger than its size in the first direction and the second direction. Compared with the assembly of the soft-pack battery monomers through the opening formed by the U-shaped housing in the third direction, the path length of assembling the soft-pack battery monomers 14 with the U-shaped housing 12 is reduced, which is beneficial to further reducing the risk of burrs on the U-shaped housing 12 scratching the soft-pack battery monomers 14, and is also convenient for simplifying the assembly process of the battery pack 10.

[0106] Please refer to Figure 3 and Figure 11 , in some embodiments, both ends of the multiple U-shaped housings 12 in the third direction respectively extend beyond the encapsulation film of the soft-pack battery monomers 14.

[0107] It can be seen that both ends of the multiple U-shaped housings 12 in the third direction respectively extend beyond the encapsulation film of the soft-pack battery monomers 14, that is, the size of the U-shaped housing 12 in the third direction is larger than the size of the encapsulation film of the soft-pack battery monomers 14 in the third direction. When the soft-pack battery monomers 14 are assembled through the open end 120 formed by the U-shaped housing 12 in the first direction, the encapsulation film is not likely to directly contact the ends of the U-shaped housing 12 in the third direction, which is convenient for reducing the possibility of burrs at the ends 122 of the U-shaped housing 12 in the third direction from scratching the soft-pack battery monomers 14, and at the same time is beneficial to improving the protection ability of the U-shaped housing 12 for the multiple soft-pack battery monomers 14.

[0108] Please refer to Figure 3 and Figure 11 , in some embodiments, both ends of the protective member 20 in the third direction are respectively flush with both ends of the U-shaped housing 12.

[0109] It can be seen that both ends of the protective member 20 in the third direction are flush with both ends of the U-shaped housing 12 respectively. Both ends of the U-shaped housing 12 in the third direction extend beyond the encapsulation film of the soft-pack battery cell 14 respectively. Then, the dimension of the protective member 20 in the third direction is greater than that of the soft-pack battery cell 14 in the third direction. Both ends of the protective member 20 in the third direction also extend beyond the encapsulation film of the soft-pack battery cell 14 respectively, increasing the protection range of the protective member 20 in the third direction. When a plurality of soft-pack battery cells 14 are assembled along the open end 120 in the first direction of the U-shaped housing 12, the protective member 20 can isolate the entire end 122 of the U-shaped housing 12 in the second direction from the soft-pack battery cell 14, which is convenient for improving the reliability of the battery device 1.

[0110] In other embodiments of the present application, both ends of the protective member 20 in the third direction extend beyond the corresponding ends of the U-shaped housing 12 respectively, so as to further increase the protection range of the protective member 20 in the third direction, thereby reducing the possibility that the burrs existing at the end 122 of the U-shaped housing 12 in the second direction scratch the soft-pack battery cell 14, and improving the reliability of the battery device 1.

[0111] Please refer to Figure 3 and Figure 4 , in some embodiments, the protective member 20 includes a connected first protection part 22 and a second protection part 24. The first protection part 22 is arranged on the inner wall 124 of the U-shaped housing 12, and the second protection part 24 extends out of the U-shaped housing 12 from the first protection part 22. It can be understood that for the end 122 wrapped by the protective member 20, it has an end face, and the inner wall 124 is bent and connected to the end face. Taking the open end 120 located at one end of the U-shaped housing 12 in the first direction as an example, with the end face of the open end 120 as the boundary, both the first protection part 22 and the U-shaped housing 12 are located on one side of the end face in the first direction, while at least part of the second protection part 24 is located on the other side of the end face in the first direction.

[0112] It can be seen that the first protection part 22 is arranged on the inner wall 124 of the U-shaped housing 12, and the second protection part 24 extends out of the U-shaped housing 12 from the first protection part 22, so that the protective member 20 can better cover the corner parts of the end 122 of the U-shaped housing 12, and burrs are likely to exist at the corner parts. The protective member 20 can better separate the burrs. That is, the second protection part 24 extending out of the U-shaped housing 12 can effectively separate the burrs existing at the end 122 of the open end 120 from the soft-pack battery cell 14. Even if the burrs existing at the end 122 are relatively long, they are not likely to scratch the soft-pack battery cell 14, which is convenient for improving the reliability of the battery pack 10, and further improving the reliability of the battery device 1. Among them, the corner part of the end 122 can be understood as the connection position between the inner wall 124 of the U-shaped housing 12 and the end face of the end 122.

[0113] In some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction. The protective member 20 is configured as a plate-like structure, and the length of the portion of the second protective portion 24 extending outside the U-shaped housing 12 in the first direction is greater than the thickness of the U-shaped housing 12 (for example Figure 3 L1 in

[0114] It can be seen that the length of the portion of the second protective portion 24 extending outside the U-shaped housing 12 in the first direction is greater than the thickness of the U-shaped housing 12. It can be understood that the length, size, etc. of the burrs are related to the thickness of the U-shaped housing 12. The above setting enables the second protective portion 24 to have sufficient length in the first direction, and can effectively separate at least most of the burrs at the end 122 of the open end 120 of the U-shaped housing 12 from the pouch cell unit 14. When the pouch cell unit 14 is assembled from the open end 120, the burrs existing at the end 122 of the open end 120 are not likely to scratch the pouch cell unit 14, which is convenient for improving the reliability of the battery device 1.

[0115] Please refer to Figure 3 and Figure 5 In some embodiments, the protective member 20 includes a connected first protective portion 22 and a second protective portion 24. The first protective portion 22 is disposed on the inner wall 124 of the U-shaped housing 12, and the second protective portion 24 extends out of the U-shaped housing 12 from the first protective portion 22, and the second protective portion 24 covers the end face of the U-shaped housing 12 corresponding to the open end 120. It can be seen that the first protective portion 22 is disposed on the inner wall 124 of the U-shaped housing 12, and the second protective portion 24 covers the end face of the U-shaped housing 12 corresponding to the open end 120. Then the first protective portion 22 and the second protective portion 24 cover the corner position where the open end 120 is assembled with the pouch cell unit 14. The first protective portion 22 and the second protective portion 24 can better cover the burrs existing at the corner parts of the end 122, so as to reduce the possibility of the burrs at the open end 120 scratching the pouch cell unit 14 during assembly and improve the reliability of the battery device 1.

[0116] Exemplarily, the protective member 20 before assembly is a plate-like structure. First, the first protective portion 22 is attached to the inner wall 124 of the U-shaped housing 12, and then the protective member 20 is bent so that the second protective portion 24 is attached to the end face of the open end 120, so that the first protective portion 22 and the second protective portion 24 cover the corner parts of the open end 120 close to the pouch cell unit 14, which is convenient for reducing the possibility of the burrs at the open end 120 scratching the pouch cell unit 14 during assembly.

[0117] Please refer to Figure 3 and Figure 6, in some embodiments, the second protective part 24 also covers one side surface of the U-shaped housing 12 facing away from the pouch battery cell 14 therein, so that the protective member 20 defines a groove 26, and the edge of the U-shaped housing 12 corresponding to the open end 120 is inserted into the groove 26.

[0118] It can be seen that the first protective part 22 is provided on the inner wall 124 of the U-shaped housing 12, and the second protective part 24 covers the end surface of the U-shaped housing 12 corresponding to the open end 120 and one side surface of the U-shaped housing 12 facing away from the pouch battery cell 14 therein. Then, the second protective part 24 can cover a part of the outer wall of the U-shaped housing 12, so that the first protective part 22 and the second protective part 24 define a groove 26, which is beneficial to increasing the mating area between the U-shaped housing 12 and the protective member 20. When the U-shaped housing 12 and the protective member 20 are bonded, it is beneficial to increase the mating area between the U-shaped housing 12 and the protective member 20 and improve the assembly reliability of the U-shaped housing 12 and the protective member 20. At the same time, the second protective part 24 can cover the corner part of the open end 120 away from the pouch battery cell 14, that is, the second protective part 24 covers the connection position between the end surface of the open end 120 and the outer wall of the U-shaped housing 12, which is beneficial to reducing the influence of the burrs at the corner part of the open end 120 away from the pouch battery cell 14 on other components.

[0119] Optionally, the edge of the U-shaped housing 12 corresponding to the open end 120 is inserted into the groove 26. At this time, the assembly method of the U-shaped housing 12 and the protective member 20 can be realized by any of the following methods, but not limited to this: Method 1, the protective member 20 defines the groove 26 through processing such as bending. The staff can insert the edge of the open end 120 of the U-shaped housing 12 into the groove 26, which is convenient for reducing the assembly difficulty of the U-shaped housing 12 and the protective member 20. Method 2, the protective member 20 before assembly is a plate-like structure. First, the first protective part 22 is attached to the inner wall 124 of the U-shaped housing 12, and then the protective member 20 is bent so that the second protective part 24 is attached to the end surface of the open end 120, so that the first protective part 22 and the second protective part 24 cover the corner part of the open end 120 close to the pouch battery cell 14. Then, the remaining part of the second protective part 24 is bent again so that the remaining part of the second protective part 24 is attached to the outer wall of the U-shaped housing 12. At this time, the edge of the open end 120 of the U-shaped housing 12 is fitted into the groove 26 defined by the first protective part 22 and the second protective part 24.

[0120] In some embodiments, the thickness of the portion of the U-shaped housing 12 that mates with the groove 26 decreases in a direction toward the bottom wall of the groove 26. It can be seen that if the thickness of the portion of the U-shaped housing 12 that mates with the groove 26 decreases in a direction toward the bottom wall of the groove 26, the portion with the decreased thickness of the U-shaped housing 12 can serve as a guiding structure, which plays a guiding role during the assembly process, enabling the U-shaped housing 12 and the groove 26 of the protective member 20 to be more conveniently aligned, improving the assembly efficiency of the U-shaped housing 12 and the protective member 20. At the same time, due to the gradually decreasing thickness, the edge of the U-shaped housing 12 will gradually match the contour of the groove 26 during the insertion process until it is fully inserted in place, reducing the assembly error caused by improper alignment.

[0121] Please refer to Figure 3 and Figure 7 , in some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction, and the height of the first protective portion 22 in the first direction (e.g., Figure 7 H1 in Figure 7 ) first decreases and then increases along the length direction of the protective member 20 (such as the CC' direction in

[0122] ), and the position where the height of the first protective portion 22 is the smallest is located in the middle of the first protective portion 22 in the length direction. The length direction of the protective member 20 is perpendicular to the first direction. It can be understood that in the embodiments of the present application, the first direction is not parallel to the length direction of the protective member 20, and the length direction of the protective member 20 can be the third direction described above. It can be seen that due to the limitation of the manufacturing process of the U-shaped housing 12, there will be machining burrs at the end 122 of the U-shaped housing 12, and most of the machining burrs are mainly concentrated at the two ends of the open end 120 along the length direction of the U-shaped housing 12. By making the height of the first protective portion 22 in the first direction first decrease and then increase along the length direction of the protective member 20, the burrs existing at the two ends of the end 122 of the open end 120 in the length direction can be effectively separated from the soft-pack battery cell 14, so that the burrs existing at the two ends of the end 122 of the open end 120 in the length direction are not likely to scratch the soft-pack battery cell 14, and at the same time, it is convenient to reduce the material consumption for manufacturing the protective member 20.

[0123] Of course, in other embodiments, as Figure 6 shown, the open end 120 is located at one end of the U-shaped housing 12 in the first direction, and the height of the first protective portion 22 in the first direction remains unchanged along the length direction of the protective member 20, which is convenient for simplifying the structure and processing procedure of the protective member 20.

[0124] It can be understood that the height of the second protective part 24 in the first direction may or may not be equal to the height of the first protective part 22 in the first direction, and the changing trend of the height of the second protective part 24 in the first direction along the length direction of the protective member 20 may be the same as or different from the changing trend of the height of the first protective part 22 in the first direction along the length direction of the protective member 20.

[0125] Please refer to Figure 3 and Figure 8 , in some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction. The first protective part 22 includes a first portion 27 and a second portion 28 that are spaced apart along the length direction of the protective member 20. The first portion 27 and the second portion 28 are respectively located at both ends of the inner wall 124 of the U-shaped housing 12 in the length direction, and both are located on both sides of the middle of the first protective part 22 in the length direction.

[0126] It can be seen that due to the limitations of the manufacturing process of the U-shaped housing 12, there will be machining burrs at the end 122 of the U-shaped housing 12, and most of the machining burrs are mainly concentrated at the positions of both ends of the open end 120 along the length direction of the U-shaped housing 12. By respectively arranging the first portion 27 and the second portion 28 of the first protective part 22 at both ends of the inner wall 124 of the U-shaped housing 12 in the length direction, it is convenient to reduce the possibility that the burrs concentrated at both ends of the end 122 of the open end 120 scratch the soft-pack battery cell 14 in the length direction, which is convenient to improve the reliability of the battery device 1. At the same time, the material consumption of the protective member 20 is reduced, which is beneficial to reducing the material cost.

[0127] Please refer to Figure 3 and Figure 8 , in some embodiments, the distance between the first portion 27 and the second portion 28 in the length direction is x, and the occupied length of the first protective part 22 in the length direction is L, and x / L ≤ 1 / 3. Among them, the occupied length of the first protective part 22 in the length direction can be understood as the distance between the two ends of the length of the first protective part 22.

[0128] It can be seen that the ratio of the length of the part of the first protective part 22 that does not fit the inner wall 124 of the U-shaped housing 12 to the total occupied length of the first protective part 22 is less than or equal to 1 / 3, so that the first protective part 22 can fully cover most areas of both ends of the end 122 of the open end 120 in the length direction, in order to reduce the possibility that the burrs concentrated at both ends of the end 122 of the open end 120 scratch the soft-pack battery cell 14 in the length direction. At the same time, it can also reduce the material consumption of the protective member 20 and reduce unnecessary material waste.

[0129] Please refer to Figure 3 and Figure 9, in some embodiments, the first protective portion 22 further includes a third portion 29 connected between the first portion 27 and the second portion 28. In the first direction, the heights of both the first portion 27 and the second portion 28 are greater than the height of the third portion 29. It can be seen that the first portion 27, the second portion 28, and the third portion 29 are all provided on the inner wall 124 of the U-shaped housing 12. The first portion 27 and the second portion 28 are respectively located at both ends of the inner wall 124 of the U-shaped housing 12 in the length direction. The two ends of the third portion 29 are respectively connected to the first portion 27 and the second portion 28. That is, the first portion 27, the second portion 28, and the third portion 29 can fully cover the inner wall 124 of the U-shaped housing 12 in the length direction, so that the protective member 20 can separate the end portion 122 of the open end 120 from the soft-pack battery cell 14, in order to reduce the possibility that the burrs existing at the end portion 122 of the open end 120 scratch the soft-pack battery cell 14.

[0130] In addition, in the first direction, the heights of both the first portion 27 and the second portion 28 are greater than the height of the third portion 29, so as to facilitate reducing the material consumption of the protective member 20 while the protective member 20 has a good protection effect.

[0131] Please refer to Figure 3 and Figure 10 , in some embodiments, both ends of the U-shaped housing 12 are open in the third direction, and the second protective portion 24 also covers the end faces of both ends of the U-shaped housing 12 in the third direction, so that both ends of the groove 26 are closed in the third direction.

[0132] It can be seen that both ends of the U-shaped housing 12 are open in the third direction, and the second protective portion 24 also covers the end faces of both ends of the U-shaped housing 12 in the third direction, so as to separate the end faces of both ends of the U-shaped housing 12 in the third direction from the soft-pack battery cell 14, and facilitate reducing the possibility that the burrs existing at the end faces of both ends of the U-shaped housing 12 in the third direction scratch the soft-pack battery cell 14, further improving the protection effect of the protective member 20.

[0133] It can be understood that regardless of whether the second protective portion 24 covers the end faces of both ends of the U-shaped housing 12 in the third direction, the above-mentioned multiple embodiments regarding the height setting of the first protective portion 22 in the first direction are applicable.

[0134] Please refer to Figure 3 , in some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction, and the maximum height H of the portion of the protective member 20 extending into the U-shaped housing 12 through the open end 120 satisfies 3 mm ≤ H ≤ 5 mm in the first direction; and / or, the thickness t of the protective member 20 satisfies 1 mm ≤ t ≤ 2 mm.

[0135] When the maximum height of the part of the protective member 20 extending into the U-shaped housing 12 in the first direction is too small (for example, H < 3 mm), that is, the maximum height of the part of the protective member 20 in contact with the inner wall 124 of the U-shaped housing 12 in the first direction is too small, and the burrs at the end 122 of the open end 120 are too long, the effect of separating the burrs at the end 122 of the open end 120 from the soft-pack battery cell 14 by the protective member 20 is poor. When the maximum height of the part of the protective member 20 extending into the U-shaped housing 12 in the first direction is too large (for example, H > 5 mm), that is, the maximum height of the part of the protective member 20 in contact with the inner wall 124 of the U-shaped housing 12 in the first direction is too large, the protective member 20 has a good protective effect, but the protective member 20 occupies a larger space in the first direction within the U-shaped housing 12, which is not conducive to the compact design of the battery device 1 and is also not conducive to improving the energy density of the battery device 1. By setting the maximum height of the part of the protective member 20 extending into the U-shaped housing 12 within the range of 3 mm to 5 mm, while meeting the protection requirements, the height of the protective member 20 can be minimized as much as possible. Thereby, the space occupied by the protective member 20 can be saved, facilitating the miniaturization design of the battery device 1 and improving the energy density of the battery device 1. For example, H is 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, and so on.

[0136] When the thickness of the protective member 20 is too small (for example, t < 1 mm), it cannot provide good protection. For example, when the thickness of the protective member 20 is small, the risk of the machining burrs at the end 122 of the U-shaped housing 12 piercing through the protective member 20 increases. When the thickness of the protective member 20 is too large (for example, t > 2 mm), the protective member 20 has a good protective effect, but the protective member 20 occupies a larger space within the U-shaped housing 12, which is not conducive to the compact design of the battery device 1 and is also not conducive to improving the energy density of the battery device 1. By setting the thickness of the protective member 20 within the range of 1 mm to 2 mm, while meeting the protection requirements, the thickness of the protective member 20 can be minimized as much as possible. Thereby, the space occupied by the protective member 20 can be saved, facilitating the miniaturization design of the battery device 1 and improving the energy density of the battery device 1. For example, t is 1 mm, 1.1 mm, 1.3 mm, 1.45 mm, 1.53 mm, 1.6 mm, 1.68 mm, 1.8 mm, 1.9 mm, 1.94 mm, 2 mm, and so on.

[0137] In some embodiments, if the volume energy density ρ of the soft-pack battery cell 14 ≤ 390 Wh / L, then the melting point of the protective member 20 is 150°C ≤ T < 200°C; if the volume energy density ρ of the soft-pack battery cell 14 > 390 Wh / L, then the melting point of the protective member 20 is T ≥ 200°C.

[0138] When the energy density ρ of the pouch cell 14 is greater than 390 Wh / L, the temperature of the pouch cell 14 during thermal runaway is relatively high. Therefore, the protective member 20 can be made of a material with a melting point greater than 200 °C, which can reduce the risk of performance degradation caused by the melting of the protective member 20 during thermal runaway and improve the high-temperature resistance of the protective member 20. When the energy density ρ of the pouch cell 14 is less than or equal to 390 Wh / L, the temperature of the pouch cell 14 during thermal runaway is relatively low. Therefore, the protective member 20 can be made of a material with a melting point greater than 150 °C, which is beneficial to cost reduction while meeting the high-temperature resistance of the protective member 20.

[0139] It can be seen that by setting the melting point of the protective member 20 and the energy density of the pouch cell 14 within the above ranges, the protective member 20 can have appropriate high-temperature resistance, improve the reliability of the protective member 20, thereby improving the reliability of the battery device 1, and also taking into account the cost of the protective member 20, which is beneficial to reducing the cost of the battery device 1.

[0140] In some embodiments, the protective member 20 is a high-temperature resistant insulating material member.

[0141] It can be seen that by setting the protective member 20 as a high-temperature resistant insulating material member, when the battery device 1 undergoes thermal runaway, the protective member 20 is not easily melted and damaged in performance, which is convenient for improving the service life of the protective member 20. At the same time, the protective member 20 has a good insulation effect, which is convenient for reducing the risk of short circuit between the pouch cell 14 and the U-shaped housing 12 or other metal components, and can provide a stable electrical environment for the battery pack 10, thereby improving the reliability of the battery device 1.

[0142] In some embodiments, the protective member 20 is a polypropylene member, a polyethylene terephthalate member, or a polyimide member.

[0143] It can be seen that these materials not only have excellent high-temperature resistance and can remain stable in the high-temperature environment generated during battery operation, and the protective member 20 is not easily melted and damaged in performance even when the battery device 1 undergoes thermal runaway, but also these materials have good electrical insulation properties and can effectively isolate current, further reducing the risk of short circuit.

[0144] Please refer to Figure 3 , in some embodiments, the protective member 20 fills the gap between the pouch cell 14 adjacent to the inner wall 124 of the U-shaped housing 12 and the inner wall 124 of the U-shaped housing 12.

[0145] It can be seen that the protective member 20 fills the gap between the pouch battery cell 14 and the U-shaped housing 12, that is, the U-shaped housing 12 can provide support for the pouch battery cell 14 through the protective member 20, so that the setting position of the pouch battery cell 14 in the U-shaped housing 12 is more stable, reducing the possibility of relative movement of the pouch battery cell 14 in the U-shaped housing 12 due to external vibration or impact, thereby improving the stability and durability of the battery device 1.

[0146] In some embodiments, the protective member 20 is adhesively bonded to the pouch battery cell 14 adjacent to the inner wall 124 of the U-shaped housing 12.

[0147] It can be seen that the adhesive bonding method can provide a strong adhesive force, so that a tight and firm connection is formed between the protective member 20 and the pouch battery cell 14. The U-shaped housing 12 can provide support for the pouch battery cell 14 through the protective member 20, making the structure of the battery device 1 more stable, helping to reduce the possibility of relative movement or loosening between the protective member 20 and the battery cell under external vibration or impact, and improving the reliability of the operation of the battery device 1; at the same time, the adhesive bonding method is more conducive to the protective member 20 filling the gap between the inner wall 124 of the U-shaped housing 12 and the pouch battery 14.

[0148] In addition, compared with other connection methods (such as welding, bolt connection, etc.), the adhesive bonding method is usually simpler and faster, reducing the manufacturing cost and time. At the same time, the adhesive bonding method can also adapt to pouch battery cells 14 and protective members 20 of different shapes and sizes, improving the practicability of the protective member 20.

[0149] Please refer to Figure 3 , in some embodiments, the battery device 1 further includes an adhesive member 30. The adhesive member 30 is provided at the open end 120 of the U-shaped housing 12, and the adhesive member 30 closes the open end 120. The elastic modulus of the protective member 20 is less than the elastic modulus of the adhesive member 30.

[0150] It can be seen that the adhesive member 30 closes the open end 120 of the U-shaped housing 12, providing a relatively stable working environment for the operation of the pouch battery cell 14, facilitating the improvement of the stability of the operation of the battery device 1. At the same time, the adhesive member 30 facilitates the assembly of the U-shaped housing 12, the pouch battery cell 14 and other devices (such as the box body 40 or the second heat exchange member 52 described later).

[0151] In addition, the elastic modulus of the protective member 20 is less than that of the bonding member 30. The protective member 20 can fill the gap between the pouch cell unit 14 adjacent to the inner wall 124 of the U-shaped housing 12 and the inner wall 124 of the U-shaped housing 12, so that when the bonding member 30 closes the open end 120, the adhesive is not likely to leak into the gap between the U-shaped housing 12 and the pouch cell unit 14 and form a hard structure between the U-shaped housing 12 and the pouch cell 14 after the adhesive cures. The pouch cell unit 14 abuts against the protective member 20 with a smaller elastic modulus in the U-shaped housing 12. When subjected to external mechanical shock or vibration, it is not likely to cause the problem of lithium plating of the pouch cell unit 14, which is convenient for improving the reliability of the battery device 1.

[0152] Please refer to Figure 3 and Figures 11 - 13 , in some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction. The battery packs 10 are multiple groups, and the multiple groups of battery packs 10 are arranged in sequence in the second direction, and the open ends 120 of the multiple groups of battery packs 10 are arranged on the same side. The second direction is perpendicular to the first direction. On both sides of each of the two adjacent battery packs 10 in the second direction in the second direction, there are provided protective members 20.

[0153] It can be seen that the open ends 120 of the multiple groups of battery packs 10 are arranged on the same side, which enables the staff to more easily place the pouch cell units 14 into the U-shaped housing 12 from the same side, improving the assembly efficiency of the pouch cell units 14 and the U-shaped housing 12. In addition, on both sides of each of the two adjacent battery packs 10 in the second direction in the second direction, there are provided protective members 20. These protective members 20 play a protective role. During the assembly process, there may be burrs at the end 122 of the open end. The presence of the protective members 20 can effectively reduce the possibility of these burrs scratching the pouch cell units 14, thereby improving the reliability of the battery device 1.

[0154] In some embodiments, the open end 120 is located at one end of the U-shaped housing 12 in the first direction. The battery packs 10 are multiple groups, and the multiple groups of battery packs 10 are arranged in sequence in the second direction and / or the third direction, so that the multiple groups of battery packs 10 are arranged in a multi-row and multi-column layout in the box body 40, so as to make more full use of the space in the box body 40 and facilitate the realization of the miniaturized design of the battery device 1.

[0155] In some embodiments, one side of two adjacent battery packs 10 along the second direction shares a protective member 20. It can be seen that by sharing the protective member 20 on one side of two adjacent battery packs 10 along the second direction, the number of protective members 20 used can be significantly reduced, the material cost is lowered, and the shared protective member 20 connects two adjacent U-shaped housings 12, enhancing the structural strength between two adjacent U-shaped housings 12, so that the battery pack 10 is more stable during operation and the risk of the battery pack 10 loosening or being damaged due to vibration or impact is reduced.

[0156] In addition, the design of sharing the protective member 20 simplifies the assembly process. Workers do not need to install the protective member 20 for each battery pack 10 separately, saving assembly time and improving production efficiency. At the same time, sharing the protective member 20 makes the layout of the battery device 1 more compact, which helps to optimize the overall space utilization of the battery device 1 and is conducive to improving the energy density of the battery device 1. Of course, as Figure 12 and Figure 13 shown, one side of two adjacent battery packs 10 that are adjacent to each other may not share the protective member 20.

[0157] Please refer to Figures 11 - 13 , in some embodiments, the U-shaped housings 12 of two adjacent battery packs 10 along the second direction are split parts or integral parts. It can be seen that the split U-shaped housing 12 allows for more flexible adjustment during the assembly process of the battery pack 10, facilitating adaptation to different installation environments. Especially when there are differences in the size or shape of the battery pack 10, the split-designed U-shaped housing 12 can more easily adapt to these changes, enabling the battery pack 10 to be correctly and stably installed in the battery device 1. Moreover, the split-designed U-shaped housing 12 makes it easier to disassemble and reinstall the U-shaped housing 12 when maintenance or replacement of the battery pack 10 is required, reducing the maintenance cost and improving the repair efficiency; the integral U-shaped housing 12 can form a more solid overall structure during the manufacturing process, which helps to improve the overall structural strength and durability of the battery device 1. Especially when subjected to external forces such as vibration and impact, the installation position of the battery pack 10 in the battery device 1 can be more stable. At the same time, the design of the integral U-shaped housing 12 reduces the steps and the number of components during the assembly process, thus simplifying the assembly process and helping to improve production efficiency and reduce assembly costs.

[0158] Please refer to Figures 11 - 13 , in some embodiments, the battery device 1 further includes at least one of a first heat exchange member 50 and a second heat exchange member 52. The above at least one of the first heat exchange member 50 and the second heat exchange member 52 is used for heat exchange with the soft-pack battery cell 14. The first heat exchange member 50 is arranged between the U-shaped housings 12 of two adjacent battery packs 10, and the second heat exchange member 52 is arranged between the battery pack 10 and the box body 40.

[0159] As can be seen, the first heat exchanger 50 is disposed between the U-shaped housings 12 of two adjacent battery packs 10 for heat exchange between the two adjacent battery packs 10, so that the operating temperatures of multiple battery packs 10 can be maintained within a relatively uniform range, which helps to reduce the temperature difference between the battery packs 10, facilitates improving the stability of the operation of the battery device 1. Moreover, by disposing the first heat exchanger 50 between the U-shaped housings 12 of two adjacent battery packs 10, the internal space of the battery device 1 is fully utilized, the space utilization rate is improved, and the miniaturized design of the battery device 1 is facilitated; the second heat exchanger 52 is disposed between the battery pack 10 and the box body 40, and can effectively transfer the heat generated by the battery pack 10 to the outside of the box body 40, thereby reducing the operating temperature of the battery pack 10, which helps to reduce the possibility of damage to the battery pack 10 due to overheating, and improves the safety and reliability of the battery device 1. By transferring heat through the second heat exchanger 52, the thermal management ability of the battery device 1 can be further enhanced, which helps to keep the internal temperature of the battery device 1 within a reasonable range when the battery device 1 is operating, thereby improving the operating efficiency and stability of the battery device 1.

[0160] Exemplarily, a second heat exchanger 52 may be provided between the top wall of the box body 40 and the battery pack 10, and / or a second heat exchanger 52 may be provided between the bottom wall of the box body 40 and the battery pack 10, and / or a second heat exchanger 52 may be provided between at least one of the multiple side walls of the box body 40 and the battery pack 10.

[0161] In some embodiments, the pouch battery cell 14 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell. Among them, the solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell may also be a semi-solid-state battery cell or a full-solid-state battery cell. As can be seen, using the above types of pouch battery cells 14 can provide more choices for the design of the battery device 1 to meet different usage requirements. Among them, when the pouch battery cell 14 is a lithium iron phosphate battery cell, it has the advantages of high reliability, long cycle life, light weight, large capacity, and small internal resistance; when the pouch battery cell 14 is a ternary battery cell, it has the advantages of high energy density and good electrochemical performance; when the pouch battery cell 14 is a solid-state battery cell, it has the advantages of high energy density, high reliability, light weight, and good high and low temperature performance.

[0162] In some embodiments, the pouch cell 14 is a lithium iron phosphate battery cell. In the positive electrode material of the pouch cell 14, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 96:(1 - 3):(1 - 3); the pouch cell 14 is a ternary battery cell. In the positive electrode material of the pouch cell 14, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 96:(2 - 3):(1 - 2).

[0163] In some embodiments, the positive electrode of the pouch cell 14 can be a positive electrode plate, and the positive electrode plate can 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.

[0164] 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.

[0165] As an example, the positive electrode current collector can be made of 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. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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.).

[0166] As an example, when the pouch cell 14 of the embodiment of the present application is a lithium ion battery, the positive electrode active material can include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; optionally, the positive electrode active material can include layered transition metal oxide and their respective modified compounds, which is beneficial to improving the energy density of the pouch cell 14. 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 can be used alone or in combination of two or more.

[0167] Examples of the phosphate can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon, etc.

[0168] The layered transition metal oxide includes at least one of compounds with the general formula LiaNibCocMdOeAf and their 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.

[0169] Examples of the layered transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (which can also be abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (which can also be abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (which can also be abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (which can also be abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (which can also be abbreviated as NCM811), LiNi0.9Co0.05Mn0.05O2 (which can also be abbreviated as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi0.80Co0.15Al0.05O2), and their modified compounds, etc., and at least one of them.

[0170] When the pouch cell monomer 14 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.

[0171] As an example, the positive electrode active material for a sodium-ion battery may include at least one of NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi1 / 2Ti1 / 2O2, NaNi1 / 2Mn1 / 2O2, Na2 / 3Fe1 / 3Mn2 / 3O2, NaNi1 / 3Co1 / 3Mn1 / 3O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue-based materials, and materials with the general formula XpM’q(PO4)rOxY3-x. In the general formula XpM’q(PO4)rOxY3-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.

[0172] In the embodiments of the present application, the modified compounds of the above positive electrode active materials may be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0173] During the charge and discharge process of the soft package battery cell 14, 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 package battery cell 14 is discharged to different states. In the list of positive electrode 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 positive electrode active material is applied to the battery system and undergoes charge and discharge cycles, the molar content of Li may change.

[0174] In the list of positive electrode 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.

[0175] In the embodiments of the present application, the content of elements in the positive electrode 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 atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4 g of the positive electrode active material is weighed, and 10 ml (50% concentration) of aqua regia is added thereto. Then it is placed on a 180 °C flat plate 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.

[0176] In some embodiments, the positive electrode may adopt a porous metal. The porous metal may be porous nickel, porous copper, porous aluminum, porous alloy, or porous carbon, etc. When the porous metal is used as the positive electrode, a positive electrode film layer may not be provided on the surface of the porous metal, and of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may also be filled and / or deposited in the porous metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0177] In some embodiments, the positive electrode film layer may also optionally include a positive electrode conductive agent. The embodiments of the present application do not particularly limit the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage content of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0178] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiments of the present application do not particularly limit the type of the positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resin. In some embodiments, the mass percentage content of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0179] 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 may be N-methylpyrrolidone (NMP), but is not limited thereto.

[0180] 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.

[0181] 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.

[0182] 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 electrodes, carbon, nickel, titanium, etc. can be used. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, or foam carbon, etc. The composite current collector can 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 substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0183] As an example, the negative electrode active material can be the negative electrode active material known in the art for the soft package battery cell 14. As an example, the negative electrode active material can include at least one of the following materials: carbon materials (for example, the 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.

[0184] 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 package battery cell 14.

[0185] 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 soft package battery cell 14 system, when the mass content of the silicon element is within the above range, the energy density of the soft package battery cell 14 can be improved.

[0186] 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 using 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 using an inductively coupled plasma - emission spectrometer of model ICAP7400 from ThermoFisher Scientific Company in the United States, and referring to the standard of GB / T30902 - 2014, the content of the silicon element can be obtained.

[0187] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. There is no particular limitation on the type of the negative electrode conductive agent in the embodiments of the present application. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage content of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0188] 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, water-based 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%.

[0189] 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%.

[0190] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0191] 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.

[0192] 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.

[0193] 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 can 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 can be the same or different, without particular limitation.

[0194] In some embodiments, the separator membrane may include a porous base film and a coating provided on at least one side of the porous base film, and the coating may include at least one of inorganic particles or organic particles.

[0195] The porous base film may include one or more of polyethylene and polypropylene.

[0196] The inorganic particles have good heat resistance and can improve the overall heat resistance of the separator membrane. Within the operating voltage range of the sodium-ion battery, the inorganic particles basically do not undergo oxidation and reduction reactions with metal dendrites. 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.

[0197] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, alumina Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, strontium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0198] 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 mixtures thereof.

[0199] In some embodiments, the soft-pack battery cell 14 further includes an electrolyte.

[0200] During the charge and discharge process of the battery cell, active ions shuttle 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. 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.

[0201] In some embodiments, the electrolyte may optionally further include additives. 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, and the like.

[0202] 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 carboxylate compounds.

[0203] It can be understood that when the soft-pack battery cell 14 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 14, the positive electrode active material accounts for 96 parts by weight of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts by weight of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts by weight of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0204] Exemplarily, when the soft-pack battery cell 14 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which can refer to LiFePO4, 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.

[0205] When the soft-pack battery cell 14 is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 14, the positive electrode active material accounts for 96 parts by weight of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts by weight of the total weight of the positive electrode material (for example, it can include but is not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts by weight of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but is not limited to lithium nickel cobalt manganese oxide series, lithium nickel cobalt aluminum oxide series, etc.

[0206] Exemplarily, the ternary material of the ternary battery cell can be the eight-series LiNi0.8Co0.1Mn0.1O2, 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, the eight-series LiNi0.8Co0.1Mn0.1O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0207] In the above technical solution, when the soft-pack battery cell 14 is a lithium iron phosphate battery cell, a high proportion of the positive electrode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 1. This enables the lithium iron phosphate battery cell to output a higher amount of electricity while being relatively small in volume and weight, meeting 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 1. When the soft-pack battery cell 14 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 1.

[0208] Please refer to Figure 3 , in some embodiments, the soft-pack battery cell 14 is a ternary battery cell, and a pressure relief portion 54 is provided on the wall of the U-shaped housing 12 opposite to the open end 120.

[0209] It can be seen that the pressure relief portion 54 can guide the discharged gas to relieve pressure in a directional manner when the ternary battery cell undergoes thermal runaway expansion and exhausts pressure, reducing the risk of the discharged gas disturbing the surrounding ternary battery cells, and thus reducing the risk of severe thermal runaway of the battery pack 10 composed of ternary battery cells, which is beneficial to the thermal runaway management of the battery pack 10 and improves the reliability of the battery pack 10 composed of ternary battery cells.

[0210] In some embodiments, the pressure relief portion 54 is configured as a pressure relief hole; alternatively, the pressure relief portion 54 is configured as a notch; alternatively, the pressure relief portion 54 is configured as a weakened portion. It can be seen that the pressure relief portion 54 has various different types, which can provide more choices for the design of the pressure relief portion 54 to meet different usage requirements.

[0211] In a second aspect, an electrical device 2 provided by an embodiment of the present application includes the battery device 1 of the first aspect.

[0212] In the above technical solution, since the battery device 1 has good reliability, using the battery device 1 can improve the power consumption reliability of the electrical device 2.

[0213] The following describes specific embodiments of the battery device 1 of the present application.

[0214] Embodiment 1

[0215] Please refer to Figure 3 , Figure 4 and Figures 11 - 13, the battery device 1 includes a battery pack 10, a protective member 20, a box body 40, a first heat exchange member 50, and a second heat exchange member 52.

[0216] The box body 40 has a receiving cavity 42. A plurality of battery packs 10 are located in the receiving cavity 42. The open ends 120 of the plurality of battery packs 10 are arranged on the same side along the second direction. The first heat exchange member 50 is arranged between the U-shaped shells 12 of two adjacent battery packs 10. The second heat exchange member 52 is arranged between the battery pack 10 and the box body 40. At least one of the first heat exchange member 50 and the second heat exchange member 52 is used for heat exchange with the soft-pack battery cell 14.

[0217] The battery pack 10 includes a U-shaped shell 12 and a plurality of soft-pack battery cells 14. The plurality of soft-pack battery cells 14 are arranged side by side. The U-shaped shell 12 wraps the plurality of soft-pack battery cells 14 around three circumferential sides thereof. The open end 120 is located at one end of the U-shaped shell 12 in the first direction. The plurality of soft-pack battery cells 14 are arranged in sequence along the second direction. Protective members 20 are respectively arranged on both sides of the open end 120 in the second direction. The two ends of the plurality of U-shaped shells 12 in the third direction respectively extend beyond the packaging film of the soft-pack battery cells 14.

[0218] The protective member 20 wraps around the edge of the open end 120 of the U-shaped shell 12 to cover the end portion 122 of the U-shaped shell 12. The protective member 20 includes a connected first protection portion 22 and a second protection portion 24. The first protection portion 22 is arranged on the inner wall 124 of the U-shaped shell 12. The second protection portion 24 extends out of the U-shaped shell 12 from the first protection portion 22 to separate the end portion 122 of the U-shaped shell 12 from the soft-pack battery cell 14. The two ends of the protective member 20 in the third direction are respectively flush with the two ends of the U-shaped shell 12.

[0219] Embodiment Two:

[0220] Please refer to Figure 3 、 Figure 5 and Figures 11 - 13 , the structure of the battery device 1 provided in Embodiment Two is substantially the same as that of the battery device 1 in Embodiment One. The difference is that: the second protection portion 24 is covered on the end face of the U-shaped shell 12 corresponding to the open end 120, so that the protection portion is substantially L-shaped.

[0221] Embodiment Three:

[0222] Please refer to Figure 3 、 Figure 6 and Figures 11 - 13 , the structure of the battery device 1 provided in Embodiment Three is substantially the same as that of the battery device 1 in Embodiment Two. The difference is that: the second protection portion 24 is further covered on the side surface of the U-shaped shell 12 facing away from the soft-pack battery cell 14 therein, so that the protective member 20 defines a groove 26, making the protection portion substantially C-shaped.

[0223] Example 4

[0224] Please refer to Figure 3 、 Figure 7 and Figures 11 - 13 。 The structure of the battery device 1 provided in Example 4 is substantially the same as that of the battery device 1 in Example 3, except that: the height of the first protection part 22 in the first direction first decreases and then increases along the length direction of the protection member 20, and the position where the height of the first protection part 22 is the smallest is located in the middle of the first protection part 22 in the length direction.

[0225] Example 5

[0226] Please refer to Figure 3 、 Figure 8 and Figures 11 - 13 。 The structure of the battery device 1 provided in Example 5 is substantially the same as that of the battery device 1 in Example 3, except that: the first protection part 22 includes a first part 27 and a second part 28 which are arranged at intervals along the length direction of the protection member 20. The first part 27 and the second part 28 are respectively located at both ends of the inner wall 124 of the U-shaped housing 12 in the length direction, and both are located on both sides of the middle of the first protection part 22 in the length direction.

[0227] Example 6

[0228] Please refer to Figure 3 、 Figure 9 and Figures 11 - 13 。 The structure of the battery device 1 provided in Example 6 is substantially the same as that of the battery device 1 in Example 5, except that: the first protection part 22 further includes a third part 29 connected between the first part 27 and the second part 28. In the first direction, the height of the first part 27 and the height of the second part 28 are both greater than the height of the third part 29.

[0229] Example 7

[0230] Please refer to Figure 3 and Figures 10 - 13 。 The structure of the battery device 1 provided in Example 7 is substantially the same as that of the battery device 1 in Example 3, except that: the second protection part 24 also covers the two end faces of the U-shaped housing 12 in the third direction, so that both ends of the groove 26 in the third direction are closed.

[0231] It can be seen that in the above-described first to seventh embodiments, the burrs existing at the end portion 122 of the open end 120 of the U-shaped housing 12 can be separated from the pouch cell monomers 14, so that when a plurality of pouch cell monomers 14 are assembled in the U-shaped housing 12, the burrs existing at the end portion 122 of the open end 120 are not likely to scratch the pouch cell monomers 14, which is convenient for improving the reliability of the battery pack 10 and thus improving the reliability of the battery device 1.

[0232] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, if there is no special description, all the implementation manners and optional implementation manners of the present application may be combined with each other to form a new technical solution. If there is no special description, all the technical features and optional technical features of the present application may be combined with each other to form a new technical solution. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Box; A battery pack is disposed in the box and includes a U-shaped shell and a plurality of soft-pack battery cells, wherein the plurality of soft-pack battery cells are arranged side by side, the U-shaped shell wraps the plurality of soft-pack battery cells around three of the four circumferential sides of the plurality of soft-pack battery cells, the remaining one of the four circumferential sides of the plurality of soft-pack battery cells is exposed through an open end of the U-shaped shell, and is bonded to the box through the open end; The protective member surrounds the edge of each wall body around the open end of the U-shaped shell and covers the end of the U-shaped shell, and is located between the wall body and the box body, and between the end of the U-shaped shell and the soft-pack battery cell.

2. The battery device according to claim 1, characterized in that: The open end is located at one end of the U-shaped shell in the first direction, and the plurality of soft-pack battery cells are arranged in sequence along the second direction. The protective parts are respectively provided on both sides of the open end in the second direction. The size of the U-shaped shell in the third direction is larger than its size in the first direction and its size in the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery device according to claim 2, characterized in that: Both ends of the plurality of U-shaped shells in the third direction extend beyond the packaging films of the soft-pack battery cells.

4. The battery device according to claim 3, characterized in that: The two ends of the protective member in the third direction are respectively arranged flush with the two ends of the U-shaped shell, or the two ends of the protective member in the third direction extend respectively beyond the corresponding two ends of the U-shaped shell.

5. The battery device according to claim 1, characterized in that: The protective member includes a first protective portion and a second protective portion connected to each other. The first protective portion is arranged on the inner wall of the U-shaped shell, and the second protective portion extends out of the U-shaped shell from the first protective portion and covers the end surface of the U-shaped shell corresponding to the open end.

6. The battery device according to claim 5, characterized in that: The second protection part is also covered on a side surface of the U-shaped shell away from the soft-pack battery cell therein, so that the protection member defines a groove, and the edge of the U-shaped shell corresponding to the open end is inserted into the groove.

7. The battery device according to claim 6, characterized in that: The thickness of a portion of the U-shaped housing that matches the groove decreases in a direction toward a bottom wall of the groove.

8. The battery device according to claim 6, characterized in that: The open end is located at one end of the U-shaped housing in the first direction, The height of the first protection portion in the first direction remains constant along the length direction of the protection element; or, The height of the first guarding part in the first direction first decreases and then increases along the length direction of the guard. The position where the first guarding part has the smallest height is located in the middle of the first guarding part in the length direction. The length direction of the guard is perpendicular to the first direction.

9. The battery device according to claim 6, characterized in that: The open end is located at one end of the U-shaped shell in the first direction, and the first protective part includes a first part and a second part spaced apart along the length direction of the protective part, and the first part and the second part are respectively located at the two ends of the inner wall of the U-shaped shell in the length direction, and both are respectively located on both sides of the middle part of the first protective part in the length direction.

10. The battery device according to claim 9, characterized in that: The distance between the first part and the second part in the length direction is x, the length occupied by the first protection part in the length direction is L, and x / L≤1 / 3.

11. The battery device according to claim 9, characterized in that: The first protection portion further includes a third portion connected between the first portion and the second portion. In the first direction, a height of the first portion and a height of the second portion are both greater than a height of the third portion.

12. The battery device according to claim 6, characterized in that: Both ends of the U-shaped shell in the third direction are open, and the second protection part is also covered on both end surfaces of the U-shaped shell in the third direction, so that both ends of the groove in the third direction are closed.

13. The battery device according to claim 1, characterized in that: The open end is located at one end of the U-shaped shell in the first direction, and the maximum height of the portion of the protective member extending into the U-shaped shell through the open end in the first direction is 3mm≤H≤5mm; and / or, The thickness of the protective element is 1mm≤t≤2mm.

14. The battery device according to claim 1, characterized in that: The volume energy density of the soft-pack battery monomer is ρ≤390Wh / L, and the melting point of the protective member is 150°C≤T<200°C; The volume energy density ρ of the soft-pack battery monomer is greater than 390Wh / L, and the melting point T of the protective element is greater than or equal to 200°C.

15. The battery device according to claim 14, characterized in that: The protective piece is made of high temperature resistant insulating material.

16. The battery device according to claim 15, characterized in that: The protective member is a polypropylene member, a polyethylene terephthalate member, or a polyimide member.

17. The battery device according to claim 1, characterized in that: The protection member fills a gap between the soft-pack battery cell adjacent to an inner wall of the U-shaped case and an inner wall of the U-shaped case.

18. The battery device according to claim 17, characterized in that: The protective member is glued to the soft-pack battery unit adjacent to the inner wall of the U-shaped housing.

19. The battery device according to claim 17, characterized in that: Also includes: The adhesive joint is arranged at the open end of the U-shaped shell and closes the open end, and the elastic modulus of the protective element is smaller than the elastic modulus of the adhesive joint.

20. The battery device according to any one of claims 1 to 19, characterized in that: The open end is located at one end of the U-shaped housing in the first direction, the battery packs are multiple groups, the multiple groups of battery packs are arranged in sequence along the second direction and the open ends of the multiple groups of battery packs are arranged on the same side, and the second direction is perpendicular to the first direction. The protective elements are respectively provided on both sides of each of two adjacent battery groups in the second direction.

21. The battery device according to claim 20, characterized in that The protective member is shared by two adjacent battery groups at their adjacent sides.

22. The battery device according to claim 20, characterized in that The U-shaped shells of two adjacent battery groups are split parts or integrated parts.

23. The battery device according to claim 20, characterized in that The battery device further includes at least one of a first heat exchange member and a second heat exchange member, wherein the at least one of the first heat exchange member and the second heat exchange member is used for heat exchange with the soft pack battery cell. The first heat exchange member is disposed between the U-shaped shells of two adjacent battery groups, and the second heat exchange member is disposed between the battery group and the box.

24. The battery device according to any one of claims 1 to 19, characterized in that: The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

25. The battery device according to claim 24, characterized in that The soft-pack battery cell is a ternary battery cell, and a pressure relief portion is provided on a shell wall of the U-shaped shell that is arranged opposite to the open end.

26. The battery device according to claim 25, characterized in that The pressure relief portion is configured as a pressure relief hole; or, the pressure relief portion is configured as a notch; or, the pressure relief portion is configured as a weakened portion.

27. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1-26.

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