Battery device and electric device

Abstract

The utility model relates to the field of batteries, and discloses a battery device and an electric device, and the battery device comprises a box body with an accommodating space; the battery pack is arranged in the accommodating space and comprises a plurality of soft package battery monomers which are sequentially bonded and matched in the first direction, each soft package battery monomer is provided with a first surface and a second surface, and the second surface is adjacent to the first surface; the adhesive layer is arranged on one side, positioned on the first surface, of the battery pack and is used for adhering the plurality of soft package battery monomers to the box body; and the blocking piece is arranged in the accommodating space, is at least positioned between at least one soft package battery monomer at the two ends of the first direction of the battery pack and the adhesive layer, and is used for preventing the adhesive layer from overflowing into the second surface of the corresponding soft package battery monomer from the first surface of the soft package battery monomer. According to the utility model, the risk that glue overflows from the first surface to the second surface of the soft package battery monomer during gluing can be reduced in the assembly stage, the problem of local stress concentration on the surface of the soft package battery monomer is improved, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. At present, the reliability of batteries needs to be further improved. Utility Model Content

[0003] The embodiments of the present application provide a battery device and an electrical device, which can effectively improve the installation reliability of a battery pack inside the battery device, reduce the risk of damage, and thus improve the reliability of the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising: a box body having a accommodating space; a battery pack arranged in the accommodating space and comprising a plurality of soft-pack battery cells bonded and matched in sequence along a first direction, the soft-pack battery cells having a first surface and a second surface, the second surface being adjacent to the first surface; an adhesive layer arranged on a side of the battery pack located on the first surface and used to bond the plurality of soft-pack battery cells to the box body; a blocking member arranged in the accommodating space and at least between at least one soft-pack battery cell at both ends of the battery pack in the first direction and the adhesive layer, used to prevent the adhesive layer from overflowing from the first surface of the soft-pack battery cell to the second surface of the corresponding soft-pack battery cell, the blocking member at least covering the corner position of the corresponding soft-pack battery cell.

[0005] In the above technical solution, by setting a blocking member at least between at least one soft-pack battery cell and the glue layer at both ends of the battery pack in the first direction, the risk of glue overflowing from the first surface of the soft-pack battery cell to the second surface during glue coating can be reduced during the assembly stage of the battery device, and the probability of glue overflowing on the second surface of the soft-pack battery cell to form a hard structure can be reduced, thereby improving the problem of local stress concentration on the surface of the soft-pack battery cell, reducing the risk of damage to the soft-pack battery cell, and enhancing the insulation between the first surface of the soft-pack battery cell and the box, thereby helping to improve the reliability of the soft-pack battery cell and the reliability of the battery device. By covering the corner position of the corresponding soft-pack battery cell with the blocking member, the probability of glue accumulation at the corner position of the outermost soft-pack battery cell can be effectively reduced, which plays a better role in preventing glue overflow, and at the same time can reduce the size of the blocking member and reduce the amount of material used, and can also leave a suitable size of space on the first surface for glue coating, thereby improving the bonding firmness of the soft-pack battery cell and the box.

[0006] In some embodiments of the present application, the blocking member at least covers an edge position of the corresponding soft-pack battery cell in the first direction.

[0007] In the above technical solution, the blocking member of the above solution can reduce the risk of glue overflowing to the second surface of the larger area of ​​the soft-pack battery cell, thereby further reducing the risk of glue overflowing to form a hard structure at the edge of the battery pack, and further reducing the risk of damage to the soft-pack battery cell, thereby improving the reliability of the battery device.

[0008] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member on the plane where the first surface is located is smaller than the sum of the areas of all the first surfaces.

[0009] In the above technical solution, the portion of the blocking member close to the first surface can prevent the first surface of a portion of the soft-pack battery cells from being blocked, so that the first surfaces of at least a portion of the soft-pack battery cells of the battery pack can be bonded and fixed to the box body through the adhesive layer. At the same time, the blocking member can also play a certain blocking role, which can better protect the first surfaces of a portion of the soft-pack battery cells, improve the reliability of the soft-pack battery cells, and further improve the reliability of the battery device as a whole.

[0010] In some embodiments of the present application, the blocking members are disposed at both ends of the battery pack in a first direction. In the first direction, the size of the battery pack is L1, and the size of the blocking member is L2, wherein 0.05≤L2 / L1.

[0011] In the above technical solution, by setting the size ratio of the blocking member and the battery pack in the first direction within the above range, the size of the blocking member corresponding to the first surface can be within an appropriate range, which can not only better prevent the glue from overflowing from the first surface to the second surface, but also play a better protective role, reduce the risk of sharp objects contacting the first surface and damaging the soft-pack battery cell, and improve the reliability of the battery device.

[0012] In some embodiments of the present application, 0.05≤L2 / L1≤0.15. In this technical solution, by further accurately controlling L2 / L1 within the above range, the blocking member can have a good protective effect on the first surface while meeting the function of blocking glue overflow, and can ensure that the first surface has a suitable area to be firmly bonded and fixed to the box body through the glue layer.

[0013] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member on the plane where the first surface is located is greater than or equal to the area of ​​all the first surfaces.

[0014] In the above technical solution, the blocking member can be connected to the battery pack, and the blocking member is fixed to the box body by bonding with the glue layer, thereby indirectly fixing the soft-pack battery cell to the box body. In this way, the first surface and the glue layer of all soft-pack battery cells can be separated, thereby better reducing the risk of glue overflowing from the first surface to the second surface, and further reducing the probability of the soft-pack battery cell forming a hard structure after the glue overflow solidifies. It can also more comprehensively protect all the first surfaces in the battery pack and further reduce the risk of processing burrs on the box body or external sharp objects piercing the first surface. It has better protection performance and is conducive to further improving the reliability of the battery pack.

[0015] In some embodiments of the present application, the blocking member includes a first portion and a second portion connected to each other, the first portion covers at least a portion of the first surface, and the second portion is bent relative to the first portion in a direction away from the adhesive layer.

[0016] In the above technical solution, the first part can play a role in increasing the gap between the first surface and the box body, which is conducive to enhancing the insulation between the battery pack and the box body. Since the second part is bent relative to the first part, the second part can play a better blocking role, which is conducive to further reducing the risk of glue spreading to the second surface adjacent to the first surface. The blocking member with the above structure is relatively simple in structure and easy to manufacture, which can reduce costs.

[0017] In some embodiments of the present application, a battery pack includes a housing having a first opening opened toward a first surface, and a plurality of soft-pack battery cells are accommodated in the housing.

[0018] In the above technical solution, the outer shell can provide mechanical protection on the outside of multiple soft-pack battery cells, reduce the risk of damage to the soft-pack battery cells due to external mechanical impact, and better fix the positions of multiple soft-pack battery cells, reduce the probability of displacement of the soft-pack battery cells inside the box, and help improve the installation reliability of the soft-pack battery cells in the box.

[0019] In some embodiments of the present application, the shell is a metal material or a non-metal material. In the above technical solution, the shell is a metal material with high strength and rigidity, which can provide good support for the soft-pack battery cell; when the shell is a non-metal material, it has good strength and rigidity while being conducive to reducing weight and taking into account economy, and can reduce the weight of the battery device and improve the energy density of the battery device.

[0020] In some embodiments of the present application, the shell is made of stainless steel or aluminum. In the above technical solution, the shell is made of stainless steel, which has high strength and rigidity, good tolerance, and is not easy to rust and corrode, which is conducive to maintaining the integrity and stability of the shell for a long time. At the same time, the price is relatively low, which can reduce costs; the shell is made of aluminum, which has high strength and rigidity of metal materials and light weight, which is conducive to improving the energy density of the battery device. Aluminum also has good thermal conductivity, which is conducive to the heat dissipation of soft-pack battery cells, and has good corrosion resistance, which can also maintain the integrity and stability of the shell for a long time.

[0021] In some embodiments of the present application, a pressure relief portion is provided on the shell wall away from the first opening. In the above technical solution, since the shell of the soft-pack battery cell is made of soft material, there is no direction when the gas is damaged and the pressure is released. By providing a pressure relief portion on the shell wall away from the first opening, the pressure relief portion can guide the gas discharged from the soft-pack battery cell to release pressure in a directional manner, which is beneficial to the thermal runaway management of the battery device.

[0022] In some embodiments of the present application, 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. In the above technical solution, more options can be provided for the design of the pressure relief portion to meet different usage requirements.

[0023] In some embodiments of the present application, the shell includes a first shell wall, a second shell wall and a third shell wall, the second shell wall and the third shell wall are connected to both ends of the first shell wall in a first direction, and a first opening is formed between the second shell wall and the third shell wall.

[0024] In the above technical solution, the outer shell is set to the above structure to facilitate the assembly of the battery pack, which is beneficial to improving assembly efficiency and reducing costs. It is also beneficial to later maintenance and reducing the cost of use. It can also better restrain multiple soft-pack battery cells while reducing the space occupied inside the box, which is beneficial to improving the compactness of the spatial layout inside the battery device, thereby improving the energy density of the battery device.

[0025] In some embodiments of the present application, the blocking members are disposed at two ends of the battery pack in the first direction, and a portion of the blocking member is in contact with or connected to the second shell wall or the third shell wall.

[0026] In the above technical solution, part of the blocking member can be fitted with the second shell wall or the third shell wall, thereby making the overall structure of the assembly consisting of the blocking member and the battery pack more compact, saving space, and improving the energy density of the battery device. Part of the blocking member can also be connected to the second shell wall or the third shell wall, thereby the blocking member and the shell cooperate with each other to better restrain multiple soft-pack battery cells and surround the four sides of the assembly consisting of multiple soft-pack battery cells, which is conducive to reducing the risk of soft-pack battery cells falling off from the shell during assembly and can improve the installation reliability of the battery pack.

[0027] In some embodiments of the present application, the first shell wall, the second shell wall and the third shell wall are located at both ends of the second direction to form a second opening, and the second direction is perpendicular to the first direction and parallel to the first surface; the blocking member is constructed as a cover plate and is arranged at both ends of the second direction of the outer shell, and the blocking member includes a first part and a second part that are connected, the first part covers at least a portion of the first surface, and the second part closes the second opening.

[0028] In the above technical solution, the blocking member can integrate the function of the cover plate, and together with the outer shell, surround the four sides of the assembly composed of multiple soft-pack battery cells, thereby playing a better protective role and reducing the risk of damage to the battery pack due to mechanical impact. The blocking member is constructed as a cover plate and can also cooperate with the outer shell to better isolate the soft-pack battery cells inside the battery pack from other components in the box, which can play a certain electrical insulation role, reduce the risk of short circuit between the soft-pack battery cells and the box or other metal parts, and is conducive to improving the electrical reliability and maintaining a stable electrical environment inside the battery device. It can be seen that the use of the above structure is conducive to improving the reliability of the battery pack, and then improving the reliability of the battery device as a whole.

[0029] In some embodiments of the present application, the blocking member is made of an insulating material. In this technical solution, by making the blocking member of an insulating material, it is helpful to further enhance the insulation between the first surface of the soft-pack battery cell and the box, thereby improving the insulation between the battery pack and the box, thereby improving the reliability of the battery device.

[0030] In some embodiments of the present application, the blocking member is a busbar component and is electrically connected to the soft-pack battery cell. At least a portion of the blocking member corresponding to the first surface is provided with an insulating layer.

[0031] In the above technical solution, by setting the blocking member as a conduit component, the function of preventing glue overflow can be integrated into the conduit component, thereby reducing the number of parts of the battery device, saving space, reducing weight, and improving the energy density of the battery device.

[0032] In some embodiments of the present application, the blocking member is constructed as a shell component of an insulating material and forms a storage space. At least part of the multiple soft-pack battery cells are arranged in the storage space, and part of the blocking member is bent toward the first surface.

[0033] In the above technical solution, by constructing the blocking member as a shell component, the blocking member can integrate the shell function, thereby reducing the number of parts and components, reducing the weight of the battery pack, and thus improving the energy density of the battery device, and it is also beneficial to reduce the assembly steps and improve the assembly efficiency. The blocking member is set as a shell component of an insulating material, which can also improve electrical insulation, reduce the risk of short circuit between the soft-pack battery cell and the box or other metal parts, provide a stable electrical environment for the battery pack, and improve the overall reliability of the battery device.

[0034] In some embodiments of the present application, the wall thickness of the barrier is H, where 1mm≤H≤3mm. In this technical solution, by setting the wall thickness of the barrier within the above range, the thickness of the barrier can be reduced as much as possible while satisfying the protection and insulation properties, thereby saving the space occupied by the barrier and reducing the weight of the barrier, which is conducive to the compact design of the battery device, and can reduce the overall weight of the battery device, and can improve the energy density of the battery device.

[0035] In some embodiments of the present application, the energy density of the soft-pack battery cell is E, and the melting point of the barrier is T1, wherein: when E≤390Wh / L, T1>150°C; when E>390Wh / L, T1>200°C.

[0036] In the above technical solution, by setting the melting point of the barrier and the energy density of the soft-pack battery cell within the above range, the barrier can have suitable high temperature resistance, thereby improving the reliability of the barrier, thereby improving the reliability of the battery device, while also taking into account the cost of the barrier, which is beneficial to reducing the cost of the battery device.

[0037] In some embodiments of the present application, the box body includes a plurality of box walls, the plurality of box walls together define a containing space, and the first surface and the blocking member are bonded to the box walls via an adhesive layer.

[0038] In the above technical solution, the first surface of the soft-pack battery cell and the blocking member can be bonded and fixed to the box wall of the box body through the adhesive layer, so that the connection between the soft-pack battery cell and the box body is more secure.

[0039] In some embodiments of the present application, the box includes a box body and a heat exchange plate, the heat exchange plate is connected to the box body and defines a accommodating space together with the box body, and the first surface and the blocking member are bonded to the heat exchange plate by an adhesive layer.

[0040] In the above technical solution, by bonding the first surface of the soft-pack battery cell and the blocking member to the heat exchange plate through the adhesive layer, the heat exchange plate can efficiently exchange heat with the soft-pack battery cell and quickly adjust the temperature of the soft-pack battery cell, which is beneficial to improving the reliability of the soft-pack battery cell and further improving the reliability of the battery device.

[0041] In some embodiments of the present application, the heat exchange plate is arranged at the bottom of the box body.

[0042] In the above technical solution, since the heat exchange plate is arranged between the soft-pack battery cell and the bottom wall of the box body, the heat exchange plate can not only efficiently exchange heat for the soft-pack battery cell, but also play a protective role. When the bottom of the box body is subjected to external mechanical impact, the heat exchange plate can play a buffering role, reducing the damage caused by the external mechanical impact to the soft-pack battery cell, thereby reducing the risk of damage to the soft-pack battery cell, improving the reliability of the battery pack, and further improving the reliability of the battery device.

[0043] In some embodiments of the present application, 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.

[0044] In the above technical solution, the soft-pack battery monomer adopts the above types to provide more options for the design of the battery device to meet different usage requirements. Among them, the soft-pack battery monomer is a lithium iron phosphate battery monomer, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the soft-pack battery monomer is a ternary battery monomer, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery monomer is a solid-state battery monomer, which has the advantages of high energy density and high reliability, light weight, and good high and low temperature performance.

[0045] In some embodiments of the present application, the soft-pack battery cell is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (1-3): (1-3); the soft-pack battery cell is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (2-3): (1-2).

[0046] In the above technical solution, when the soft-pack battery cell is a lithium iron phosphate battery cell, a high proportion of positive electrode active materials means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device, so that the lithium iron phosphate battery cell can output a higher amount of electricity in a relatively small volume and weight, meeting the application scenarios with certain requirements for energy density. The use of the above range of binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the soft-pack battery cell is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the above-mentioned proportion of positive electrode active materials, binders, and conductive agents is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and is beneficial to reducing the risk of active material shedding and electrode pulverization during charging and discharging, and extending the cycle life of the battery device.

[0047] In some embodiments of the present application, the soft-pack battery cell is a ternary battery cell, the battery pack includes a shell, the shell has a first opening opened toward the first surface, a plurality of soft-pack battery cells are accommodated in the shell, and a shell wall of the shell away from the first opening is provided with a pressure relief portion.

[0048] In the above technical solution, when the ternary battery cell undergoes thermal runaway expansion and exhaust pressure relief, the pressure relief unit can guide the exhausted gas to directional pressure relief, thereby reducing the risk of gas chaos affecting the surrounding ternary battery cells, and also reducing the risk of severe thermal runaway of the battery pack composed of the 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 the ternary battery cells.

[0049] In some embodiments of the present application, 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. In the above technical solution, more options can be provided for the design of the pressure relief portion to meet different usage requirements.

[0050] In a second aspect, an embodiment of the present application further provides an electrical device, comprising a battery device as described in any of the foregoing.

[0051] In the above technical solution, since the battery device has high reliability, the use of the battery device can improve the power consumption reliability of the power-consuming device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A schematic diagram of a structure in which the electric device provided in some embodiments of the present application is a vehicle;

[0054] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0055] Figure 3 An exploded view of the structure of a battery device provided in another embodiment of the present application;

[0056] Figure 4 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0057] Figure 5 A bottom view of a local structure of a battery device provided in some embodiments of the present application Figure 1 ;

[0058] Figure 6 A bottom view of a partial structure of a battery device provided in an embodiment of the present application Figure 2 ;

[0059] Figure 7 A schematic diagram of a partial structure of a battery device provided in another embodiment of the present application;

[0060] Figure 8 A bottom view of a partial structure of a battery device provided in another embodiment of the present application;

[0061] Fig. 9 A schematic diagram of a partial structure of a battery device provided in yet another embodiment of the present application;

[0062] Fig.10 A bottom view of a partial structure of a battery device provided in yet another embodiment of the present application;

[0063] Fig.11 A schematic diagram of a partial structure of a battery device provided in another embodiment of the present application.

[0064] icon:

[0065] 1000. Electrical devices;

[0066] 100. Battery device;

[0067] 10, box body; 11, first box body; 12, second box body; 10a, accommodating space; 111, box wall; 101, box body; 102, heat exchange plate;

[0068] 20. Battery pack; 21. Battery cell; 22. Soft-pack battery cell; 22a. First surface; 22b. Second surface; 23. Shell; 231. First shell wall; 232. Second shell wall; 233. Third shell wall; 24. Pressure relief portion;

[0069] 30. Adhesive layer;

[0070] 40. blocking member; 41. first part; 42. second part;

[0071] 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0074] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0075] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0077] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0078] The term “plurality” used in this application refers to two or more (including two).

[0079] In the present application, the battery cells may include lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, lead storage batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, which are not limited in the embodiments of the present application.

[0080] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may refer to one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging multiple battery cells.

[0081] As an example, the battery cell assembly may be a battery module, where a plurality of battery cells are arranged and fixed to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0082] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the housing. As an example, the battery cell assembly may be a battery pack, and the battery cell assembly may be accommodated in the housing by fixing the battery pack in the housing. As an example, the battery cell assembly may also be accommodated in the housing by directly fixing a plurality of battery cells to the housing. The housing may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0083] The battery cell includes a shell, an electrode assembly and an electrolyte. The shell 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 using a soft outer packaging material as a shell. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0084] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0085] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. At present, the reliability of batteries needs to be further improved.

[0086] In general battery devices, glue is usually applied to the bottom of the soft-pack battery cell during production and assembly, so as to fix the soft-pack battery cell in the box and ensure the installation reliability of the soft-pack battery cell inside the box. However, during the gluing process of the soft-pack battery cell, there is a certain probability that the glue will overflow to the outside of the soft-pack battery cell, and the overflow glue will form a hard block after solidification, which will cause local stress concentration on the outer side of the soft-pack battery cell, thereby increasing the risk of damage to the soft-pack battery cell, affecting the reliability of the soft-pack battery cell, and thus affecting the reliability of the battery device as a whole.

[0087] Based on the above considerations, in order to solve the problem of reliability of soft-pack battery cells during the assembly process of the battery device, thereby affecting the overall reliability of the battery device. The present application designs a battery device, including: a box, a battery pack, a glue layer and a blocking member. The box has a accommodating space; the battery pack is arranged in the accommodating space, and includes a plurality of soft-pack battery cells bonded and matched in sequence along a first direction, the soft-pack battery cells having a first surface and a second surface, and the second surface is adjacent to the first surface; the glue layer is arranged on one side of the battery pack located on the first surface, and is used to bond the plurality of soft-pack battery cells to the box; the blocking member is arranged in the accommodating space, and is at least located between at least one soft-pack battery cell at both ends of the battery pack located in the first direction and the glue layer, and is used to prevent the glue layer from overflowing from the first surface of the soft-pack battery cell to the second surface of the corresponding soft-pack battery cell.

[0088] In a battery device of this structure, by arranging a blocking member at least between at least one soft-pack battery cell and the glue layer at both ends of the battery pack in the first direction, the risk of glue overflowing from the first surface of the soft-pack battery cell to the second surface during glue coating can be reduced during the assembly stage of the battery device, and the probability of glue overflow forming a hard structure on the second surface of the soft-pack battery cell can be reduced, thereby improving the problem of local stress concentration on the surface of the soft-pack battery cell, reducing the risk of damage to the soft-pack battery cell, and enhancing the insulation between the first surface of the soft-pack battery cell and the box body, which is beneficial to improving the reliability of the soft-pack battery cell and the reliability of the battery device.

[0089] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0090] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0091] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electric device 1000 of an embodiment of the present application. Figure 1 , Figure 1 The power consumption device 1000 provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0092] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0093] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 21, and the battery cells 21 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 21, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 21. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0094] In the battery device 100, multiple battery cells 21 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 21 are connected in series and in parallel. Multiple battery cells 21 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 21 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 21 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 21.

[0095] Please refer to Figure 2 , Figure 2 The structure of the battery device 100 provided in some embodiments of the present application is exploded. The battery device 100 includes multiple rows of battery cells 21, which are arranged along the length direction of the box body 10, and each row of battery cells 21 includes multiple battery cells 21 arranged along the width direction of the box body 10; or, multiple rows of battery cells 21 are arranged along the width direction of the box body 10, and each row of battery cells 21 includes multiple battery cells 21 arranged along the length direction of the box body 10.

[0096] Each battery cell 21 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 21 that can be continuously used by activating the active material by charging after the battery cell is discharged; it may 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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes. For example, in Figure 2 In the figure, the battery cell 21 is in the shape of a rectangular parallelepiped.

[0097] According to some embodiments of the present application, referring to Figure 3 and Figure 4The embodiment of the present application provides a battery device 100, comprising: a box 10, a battery pack 20, a glue layer 30 and a blocking member 40. The box 10 has a storage space 10a; the battery pack 20 is arranged in the storage space 10a, and comprises a plurality of soft-pack battery cells 22 bonded and matched in sequence along a first direction X, the soft-pack battery cells 22 having a first surface 22a and a second surface 22b, the second surface 22b being adjacent to the first surface 22a; the glue layer 30 is arranged on one side of the battery pack 20 located on the first surface 22a, and is used to bond the plurality of soft-pack battery cells 22 to the box 10; the blocking member 40 is arranged in the storage space 10a, and is at least located between at least one soft-pack battery cell 22 at both ends of the battery pack 20 in the first direction X and the glue layer 30, and is used to prevent the glue layer 30 from overflowing from the first surface 22a of the soft-pack battery cell 22 to the second surface 22b of the corresponding soft-pack battery cell 22.

[0098] The explanation of the box 10 can refer to the above, and the accommodation space 10a can refer to the space defined inside the box 10 for accommodating the battery pack 20 and other devices. The shape of the box 10 can be but not limited to a cuboid, a cube, a cylinder, etc. The material of the box 10 can be but not limited to a metal material or a non-metal material, and the metal material can include but not limited to aluminum alloy, stainless steel, etc., and the non-metal material can include but not limited to plastic, carbon fiber composite material, etc.

[0099] The battery pack 20 may refer to a module composed of a plurality of soft-pack battery cells 22. The soft-pack battery cells 22 may refer to battery cells 21 whose shell is made of soft material. In the above technical solution, there may be one or more battery packs 20. In each battery pack 20, a plurality of soft-pack battery cells 22 may be arranged in sequence along a first direction X. The first direction X may refer to one of the length direction and the width direction of the box body 10. For example, referring to Figure 3 The first direction X may refer to the length direction of the box body 10 .

[0100] The glue layer 30 may refer to a layered structure formed by glue for bonding.

[0101] The blocking member 40 may refer to a structure or component used to prevent the glue layer 30 from overflowing from the first surface 22a of the soft-pack battery cell 22 to the corresponding second surface 22b of the soft-pack battery cell 22. Exemplarily, the blocking member 40 may be L-shaped and may partially cover the first surface 22a, thereby preventing the glue from overflowing to the second surface 22b; the blocking member 40 may also be a flat plate, partially covering the first surface 22a, and another portion exceeding the second surface 22b. When the glue overflows, the overflowed glue may be located on another portion of the blocking member 40 without contacting the second surface 22b, thereby also playing a role in preventing the glue from overflowing.

[0102] In the soft-pack battery cell 22, the first surface 22a and the second surface 22b may refer to the two surfaces of the soft-pack battery cell 22, and the first surface 22a may be, but is not limited to, the bottom surface, top surface or side surface of the soft-pack battery cell 22, and may be fixed to the box body 10 by the adhesive layer 30. The second surface 22b may refer to a surface disposed adjacent to the first surface 22a, and the second surface 22b may be one or more, for example, the second surface 22b may be located at one or both ends of the first direction X of the first surface 22a, or at one or both ends of the second direction Y of the first surface 22a, or at one or both ends of the first direction X of the first surface 22a and one or both ends of the second direction Y. Among them, the second direction Y may refer to the other of the length direction or the width direction of the box body 10. Exemplarily, the first direction X may refer to the length direction of the box body 10, and the second direction Y may refer to the width direction of the box body 10, wherein the box body 10 may also have a third direction Z, and the third direction Z may refer to the height direction of the box body 10.

[0103] In the battery device 100 of the above structure, during the assembly stage, glue is applied between the first surface 22a of the plurality of soft-pack battery cells 22 of the battery pack 20 and the box body 10 to form a glue layer 30. Since the blocking member 40 is located between at least one soft-pack battery cell 22 at both ends of the first direction X of the battery pack 20 and the glue layer 30, the blocking member 40 can effectively reduce the risk of glue overflowing from the first surface 22a to the second surface 22b during the glue coating process, which can effectively reduce the occurrence of glue overflow on the second surface 22b of the soft-pack battery cell 22 to form a hard structure. When the soft-pack battery cell 22 expands or moves, the risk of local stress concentration caused by the contact between the surface of the soft-pack battery cell 22 and the hard structure can be reduced, which is conducive to reducing the probability of damage to the soft-pack battery cell 22.

[0104] Secondly, the first surface 22a of the soft-pack battery cell 22 can be separated from the box body 10 by the glue layer 30, so that the soft-pack battery cell 22 and the box body 10 are not in contact, and thus the glue layer 30 can play an insulating role. Since the blocking member 40 is located between at least one soft-pack battery cell 22 at both ends of the first direction X of the battery pack 20 and the glue layer 30, the blocking member 40 can increase the distance between the first surface 22a of the soft-pack battery cell 22 and the box body 10, that is, increase the insulation gap between the first surface 22a and the box body 10, and also help to increase the thickness of the glue layer 30, thereby further enhancing the insulation between the soft-pack battery cell 22 and the box body 10.

[0105] In the above technical solution, by arranging the blocking member 40 to be located at least between at least one soft-pack battery cell 22 and the glue layer 30 at both ends of the battery pack 20 in the first direction X, the risk of glue overflowing from the first surface 22a of the soft-pack battery cell 22 to the second surface 22b during glue coating can be reduced during the assembly stage of the battery device 100, and the probability of glue overflow forming a hard structure on the second surface 22b of the soft-pack battery cell 22 can be reduced, thereby improving the problem of local stress concentration on the surface of the soft-pack battery cell 22, reducing the risk of damage to the soft-pack battery cell 22, and enhancing the insulation between the first surface 22a of the soft-pack battery cell 22 and the box body 10, thereby facilitating the improvement of the reliability of the soft-pack battery cell 22 and the reliability of the battery device 100.

[0106] In some embodiments of the present application, reference Figure 5 , Figure 6 , Figure 8 and Fig.10 The blocking member 40 at least covers the corner position of the corresponding soft-pack battery cell 22 .

[0107] It is understandable that the blocking member 40 may cover the first surfaces 22a of all the soft-pack battery cells 22 in the battery pack 20, or may only cover the first surfaces 22a of the soft-pack battery cells 22 located at both ends of the first direction X, or may only cover the corner positions of the first surfaces 22a of the soft-pack battery cells 22 located at both ends of the first direction X. In the above three cases, the blocking member 40 can satisfy the requirement of at least covering the corner positions of the corresponding soft-pack battery cells 22.

[0108] When glue is applied to the first surfaces 22a of all the soft-pack battery cells 22 of the battery pack 20, the glue spreads along the first direction X and the second direction Y and accumulates at the four corners of the battery pack 20. Therefore, the probability of glue overflow at the corners of the battery pack 20 is higher than that at other positions.

[0109] In the above technical solution, the blocking member 40 covers the corner position of the corresponding soft-pack battery cell 22, which can effectively reduce the probability of glue accumulation at the corner position of the outermost soft-pack battery cell 22, and play a better role in preventing glue overflow. At the same time, it can also reduce the size of the blocking member 40 and the amount of material used, and can also leave a suitable size of space on the first surface 22a for glue coating, thereby improving the bonding firmness between the soft-pack battery cell 22 and the box body 10.

[0110] In some embodiments of the present application, reference Figure 6 The blocking member 40 at least covers the edge position of the corresponding soft-pack battery cell 22 in the first direction X.

[0111] It can be understood that in the above technical solution, the blocking member 40 can cover the first surfaces 22a of all the soft-pack battery cells 22 in the battery pack 20, or only cover the first surfaces 22a of the soft-pack battery cells 22 located at both ends of the first direction X, or only cover the edge positions of the corresponding soft-pack battery cells 22 located in the first direction X. In the above three cases, the blocking member 40 can cover the edge positions of the corresponding soft-pack battery cells 22 located in the first direction X.

[0112] Since a plurality of soft-pack battery cells 22 are arranged along the first direction X, the second surfaces 22b of the soft-pack battery cells 22 located at both ends of the first direction X are usually large surfaces. By adopting the above technical solution, the blocking member 40 can not only reduce the risk of glue overflowing to the second surface 22b at the corner position of the soft-pack battery cell 22, but also reduce the risk of glue overflowing to the large surface of the soft-pack battery cell 22, and thus reduce the probability of the large surface of the soft-pack battery cell 22 forming a hard structure after the overflow glue solidifies, thereby further reducing the risk of damage to the soft-pack battery cell 22.

[0113] In the above technical solution, the blocking member 40 can reduce the risk of glue overflowing to the second surface 22b of the larger area of ​​the soft-pack battery cell 22, thereby further reducing the risk of glue overflowing to form a hard structure at the edge of the battery pack 20, and further reducing the risk of damage to the soft-pack battery cell 22, thereby improving the reliability of the battery device 100.

[0114] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member 40 on the plane where the first surface 22 a is located is smaller than the sum of the areas of all the first surfaces 22 a.

[0115] The “plane where the first surface 22a is located” may refer to a plane with an infinite area where the first surface 22a is located. For example, when the first surface 22a is the bottom surface of the soft-pack battery cell 22, the plane where the first surface 22a is located may refer to a horizontal plane.

[0116] “The area of ​​the orthographic projection of the blocking member 40 on the plane where the first surface 22a is located is smaller than the sum of the areas of all the first surfaces 22a”. It can be understood that the size of the portion of the blocking member 40 close to the first surface 22a can be made relatively small, only covering the first surface 22a of the corresponding soft-pack battery cell 22 (see Figure 5 and Figure 6 The size of the portion of the blocking member 40 close to the first surface 22a can also be made relatively large, and can cover the first surface 22a of one or more soft-pack battery cells 22.

[0117] When the size of the portion of the blocking member 40 close to the first surface 22a is relatively small and only covers the first surface 22a of the corresponding soft-pack battery cell 22, the first surface 22a of the multiple soft-pack battery cells 22 of the battery pack 20 is less blocked by the blocking member 40, and a larger area can be bonded and fixed to the box body 10 through the adhesive layer 30, which is beneficial to improving the installation firmness of the battery pack 20.

[0118] When the size of the portion of the blocking member 40 close to the first surface 22a is relatively large and can cover the first surface 22a of one or more soft-pack battery cells 22, the area of ​​the first surface 22a of the multiple soft-pack battery cells 22 of the battery pack 20 blocked by the blocking member 40 can be appropriately increased. At this time, the blocking member 40 can provide protection for a larger area of ​​the battery pack 20. For example, when there are processing burrs on the side of the box body 10 corresponding to the first surface 22a or it is pierced by an external sharp object, the blocking member 40 can play a blocking role. The burrs or sharp objects are not easy to pierce the blocking member 40 and contact the first surface 22a. Since the blocking member 40 can cover a larger area, the probability of the soft-pack battery cell 22 being pierced by sharp objects and damaged can be further reduced, which is beneficial to improving the reliability of the soft-pack battery cell 22.

[0119] In the above technical solution, the portion of the blocking member 40 close to the first surface 22a can prevent the first surface 22a of a portion of the soft-pack battery cells 22 from being blocked, so that the first surfaces 22a of at least a portion of the soft-pack battery cells 22 of the battery pack 20 can be bonded and fixed to the box body 10 through the adhesive layer 30. At the same time, the blocking member 40 can also play a certain blocking role, which can better protect the first surfaces 22a of a portion of the soft-pack battery cells 22, improve the reliability of the soft-pack battery cells 22, and further improve the overall reliability of the battery device 100.

[0120] In some embodiments of the present application, reference Figure 4 and Figure 5 The blocking member 40 is disposed at both ends of the battery pack 20 in the first direction X. In the first direction X, the size of the battery pack 20 is L1, and the size of the blocking member 40 is L2, wherein 0.05≤L2 / L1.

[0121] L2 / L1 may be, but is not limited to, 0.05, 0.07, 0.09, 0.10, 0.12, 0.15, 0.17, 0.2, 0.25, 0.3, etc. In other words, the blocking member 40 may select an appropriate size according to the value of the size L1 of the battery pack 20. For example, the size L2 of the blocking member 40 in the first direction X may be 5 mm, 6 mm, 7 mm, etc.

[0122] It is understandable that L2 / L1 must be greater than or equal to 0.05. If L2 / L1 is less than 0.05, the size of the portion of the blocking member 40 corresponding to the first surface 22a is relatively small, and the area of ​​the first surface 22a covered by the blocking member 40 is small. The blocking member 40 does not have enough solid parts to block the glue, and the risk of the glue overflowing from the blocking member 40 to the second surface 22b increases, and it cannot effectively prevent the glue from overflowing. In addition, the size of the portion of the blocking member 40 corresponding to the first surface 22a is relatively small, which also increases the risk of sharp objects piercing the first surface 22a, and it cannot play a good protective role.

[0123] In the above technical solution, by setting the size ratio of the blocking member 40 and the battery pack 20 in the first direction X within the above range, the size of the blocking member 40 corresponding to the first surface 22a can be within an appropriate range, which can not only better prevent the glue from overflowing from the first surface 22a to the second surface 22b, but also play a better protective role, reduce the risk of sharp objects contacting the first surface 22a and damaging the soft-pack battery cell 22, and improve the reliability of the battery device 100.

[0124] In some embodiments of the present application, 0.05≤L2 / L1≤0.15.

[0125] Further, L2 / L1 may be, but is not limited to, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, etc. It is understandable that if L2 / L1 is greater than 0.15, the area of ​​the first surface 22a covered by the blocking member 40 is relatively large, resulting in a reduction in the area of ​​the glue-coated area on the first surface 22a, thereby affecting the bonding firmness between the soft-pack battery cell 22 and the box body 10.

[0126] In the above technical solution, by further accurately controlling L2 / L1 within the above range, the blocking member 40 can satisfy the function of blocking glue overflow while having a better protective effect on the first surface 22a, and can ensure that a suitable area of ​​the first surface 22a is firmly bonded and fixed to the box body 10 through the glue layer 30.

[0127] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member 40 on the plane where the first surface 22 a is located is greater than or equal to the area of ​​all the first surfaces 22 a.

[0128] It is understandable that the size of the portion of the blocking member 40 corresponding to the first surface 22a can be relatively large, thereby being able to cover the first surfaces 22a of all soft-pack battery cells 22. Specifically, the area of ​​the orthographic projection of the blocking member 40 on the plane where the first surface 22a is located can be equal to the area of ​​all first surfaces 22a. Exemplarily, the blocking member 40 is an L-shaped plate or a U-shaped plate, and the area of ​​the plate surface of the blocking member 40 located on one side of the first surface 22a is equal to the sum of the areas of the first surfaces 22a of all soft-pack battery cells 22. The area of ​​the orthographic projection of the blocking member 40 on the plane where the first surface 22a is located can also be greater than the area of ​​all first surfaces 22a. Exemplarily, the blocking member 40 can also be an L-shaped plate or a U-shaped plate, and the area of ​​the plate surface of the blocking member 40 located on one side of the first surface 22a is greater than the sum of the areas of the first surfaces 22a of all soft-pack battery cells 22.

[0129] In the above technical solution, the blocking member 40 can be connected to the battery pack 20, and the blocking member 40 is bonded and fixed to the box body 10 through the adhesive layer 30, thereby indirectly fixing the soft-pack battery cell 22 to the box body 10. In this way, the first surface 22a of all soft-pack battery cells 22 and the adhesive layer 30 can be separated, thereby better reducing the risk of glue overflowing from the first surface 22a to the second surface 22b, and further reducing the probability of the soft-pack battery cell 22 having a lateral overflow glue and forming a hard structure after solidification, and can also more comprehensively protect all the first surfaces 22a in the battery pack 20, and further reduce the risk of processing burrs on the box body 10 or external sharp objects piercing the first surface 22a, having better protection performance, and being conducive to further improving the reliability of the battery pack 20.

[0130] In some embodiments of the present application, reference Figure 4 The blocking member 40 includes a first portion 41 and a second portion 42 connected to each other. The first portion 41 covers at least a portion of the first surface 22 a , and the second portion 42 is bent relative to the first portion 41 in a direction away from the adhesive layer 30 .

[0131] It is understood that the second portion 42 is arranged at an angle relative to the first portion 41, and the angle between the two can be set as needed. For example, the angle between the second portion 42 and the first portion 41 is an obtuse angle, so that the blocking member 40 can be configured in a V shape; the angle between the second portion 42 and the first portion 41 can also be a right angle, so that the blocking member 40 can be configured in an L shape (see Figure 4 , Figure 7 , Fig. 9 and Fig.11 ). Optionally, the first portion 41 and the first surface 22a may be connected by a method including but not limited to hot melting or bonding.

[0132] In the above technical solution, the first part 41 can increase the gap between the first surface 22a and the box body 10, which is beneficial to enhance the insulation between the battery pack 20 and the box body 10. Since the second part 42 is bent relative to the first part 41, the second part 42 can play a good blocking role, which is beneficial to further reduce the risk of glue spreading to the second surface 22b adjacent to the first surface 22a. The blocking member 40 with the above structure is relatively simple in structure and easy to manufacture, which can reduce costs.

[0133] In some embodiments of the present application, reference Figure 3 and Figure 4 The battery pack 20 includes a housing 23 having a first opening opened toward the first surface 22 a , and a plurality of soft-pack battery cells 22 are accommodated in the housing 23 .

[0134] The shell 23 may refer to a shell component that accommodates multiple soft-pack battery cells 22. Since the shell of the soft-pack battery cell 22 is made of soft material, the shell is relatively soft, its rigidity and strength are not high, and it is easily damaged by external mechanical impact. The shell 23 can provide a relatively strong external protection structure for the multiple soft-pack battery cells 22. For example, when the battery device 100 is subjected to mechanical external forces such as collision and extrusion, the shell 23 can withstand and disperse these forces, reduce the pressure on the soft-pack battery cell 22, and reduce the risk of the soft-pack battery cell 22 being punctured, deformed, etc., which is conducive to protecting the reliability of the soft-pack battery cell 22.

[0135] The shell 23 can also ensure that the soft-pack battery cell 22 is in the correct position in the box 10. When the soft-pack battery cell 22 is only fixed by the first surface 22a and the box 10, there is a problem of connection reliability. For example, during the transportation, installation and use of the battery device 100, the soft-pack battery cell 22 may be displaced. The shell 23 can better restrain multiple soft-pack battery cells 22, which helps to stably fix multiple soft-pack battery cells 22 in a specific position, so that a reasonable distance is maintained between the soft-pack battery cells 22, which is very important for ensuring the electrical connection stability inside the battery device 100 and the effective operation of the thermal management system. For example, in the battery device 100, the fixed position of the soft-pack battery cell 22 is conducive to ensuring that the connection piece connected in series or in parallel and the electrode of the soft-pack battery cell 22 can be reliably connected, which can reduce the risk of poor contact due to the movement of the soft-pack battery cell 22.

[0136] In the above technical solution, the outer shell 23 can provide mechanical protection on the outside of multiple soft-pack battery cells 22, reduce the risk of damage to the soft-pack battery cells 22 due to external mechanical impact, and better fix the positions of multiple soft-pack battery cells 22, reduce the probability of displacement of the soft-pack battery cells 22 inside the box 10, and help improve the installation reliability of the soft-pack battery cells 22 in the box 10.

[0137] In some embodiments of the present application, the housing 23 is a metal member or a non-metal member.

[0138] When the shell 23 is made of metal, the metal material may include but is not limited to aluminum alloy, stainless steel or iron, etc.; when the shell 23 is made of non-metallic material, the non-metallic material may be but is not limited to plastic, composite material, etc.

[0139] In the above technical solution, the outer shell 23 is made of metal material and has high strength and rigidity, which can provide good support for the soft-pack battery cell 22; when the outer shell 23 is made of non-metallic material, it has good strength and rigidity while being conducive to reducing weight and taking into account economy, and can reduce the weight of the battery device 100 and improve the energy density of the battery device 100.

[0140] In some embodiments of the present application, the housing 23 is made of stainless steel or aluminum.

[0141] In the above technical solution, the outer shell 23 is made of stainless steel, which has high strength and rigidity, and also has good tolerance, is not easy to rust and corrode, which is conducive to maintaining the integrity and stability of the outer shell 23 for a long time, and at the same time the price is relatively low, which can reduce costs; the outer shell 23 is made of aluminum, which can have a lighter weight while having the high strength and rigidity of metal materials, which is conducive to improving the energy density of the battery device 100. The aluminum material also has good thermal conductivity, which is conducive to the heat dissipation of the soft-pack battery cell 22, and also has good corrosion resistance, and can also maintain the integrity and stability of the outer shell 23 for a long time.

[0142] In some embodiments of the present application, reference Figure 4 A pressure relief portion 24 is provided on the shell wall of the shell 23 away from the first opening.

[0143] The pressure relief portion 24 may refer to a structure or component that can be opened to exhaust and release pressure after the pressure inside the housing 23 reaches a preset value. Exemplarily, the pressure relief portion 24 may be an explosion-proof valve.

[0144] The shell 23 is used to accommodate one or more soft-pack battery cells 22. When the soft-pack battery cell 22 experiences thermal runaway, the internal gas expands to a large volume and causes the shell to rupture, and the gas will be exhausted and the pressure will be released outward. Since the shell of the soft-pack battery cell 22 usually does not have a pressure relief structure, the exhausted high-temperature gas will run around in the shell 23. If it leaks to the position of the soft-pack battery cell 22 that has not experienced thermal runaway, it is easy to affect the reliability of the soft-pack battery cell 22 in a normal state.

[0145] In the above technical solution, since the shell of the soft-pack battery cell 22 is made of soft material, there is no direction when it is damaged and the gas is exhausted and the pressure is released. By providing a pressure relief portion 24 on the shell wall away from the first opening of the outer shell 23, the pressure relief portion 24 can guide the gas discharged from the soft-pack battery cell 22 for directional pressure release, which is beneficial to the thermal runaway management of the battery device 100.

[0146] In some embodiments of the present application, the pressure relief portion 24 is configured as a pressure relief hole; or, the pressure relief portion 24 is configured as a notch; or, the pressure relief portion 24 is configured as a weakened portion.

[0147] The pressure relief portion 24 may be configured as a pressure relief hole. When the soft-pack battery cell 22 is exhausted and pressure is relieved, causing the internal pressure of the housing 23 to increase, the gas may flow toward the pressure relief hole to exhaust and relieve pressure outward.

[0148] The notch may refer to a structure such as a dent or groove scratched on the shell wall of the shell 23. When the gas pressure in the shell 23 is high, the strength of the position where the notch is located is weakened compared to other positions of the shell wall, and the probability of rupture is higher. The gas can break through the position where the notch is located to exhaust and release pressure.

[0149] The weakened portion may refer to a structure with relatively weak strength formed on the shell wall, for example, the weakened portion may refer to an area on the shell wall where the wall thickness is reduced, or may be a structure formed by opening a hole in the shell wall and covered with a film. When the gas pressure in the shell 23 is relatively high, the weakened portion is more likely to rupture, and the gas may break through the location of the weakened portion to exhaust and release the pressure.

[0150] In the above technical solution, by setting the pressure relief portion 24 as a pressure relief hole, a notch or a weakened portion, more options can be provided for the design of the pressure relief portion to meet different usage requirements.

[0151] In some embodiments of the present application, reference Figure 4 The housing 23 includes a first housing wall 231 , a second housing wall 232 and a third housing wall 233 . The second housing wall 232 and the third housing wall 233 are connected to two ends of the first housing wall 231 in the first direction X. A first opening is formed between the second housing wall 232 and the third housing wall 233 .

[0152] Reference Figure 4The second shell wall 232 and the third shell wall 233 are located at both ends of the first direction X of the soft-pack battery cell 22, the first shell wall 231 is located at one end of the third direction Z of the soft-pack battery cell 22, and the outer shell 23 forms a first opening at the other end of the third direction Z of the soft-pack battery cell 22.

[0153] By configuring the shell 23 to include a first shell wall 231, a second shell wall 232, and a third shell wall 233, the shell 23 as a whole can be a U-shaped shell. This shape design allows the soft-pack battery cell 22 to be relatively easily entered or removed from the first opening. During the assembly process of the battery device 100, the staff can slide the soft-pack battery cell 22 into the first opening of the U-shaped shell. Compared with a completely closed shell structure, this method is simpler and faster, and when the soft-pack battery cell 22 needs to be maintained, repaired, or replaced, the soft-pack battery cell 22 can also be more conveniently removed from the shell 23. For example, on the production line of the battery device 100, this structure of the shell 23 can improve installation efficiency and reduce assembly costs.

[0154] The shell 23 of the above structure can also better fit the shape of the soft-pack battery cell 22. The soft-pack battery cell 22 is usually flat, and the U-shaped shell 23 can tightly surround most of the surface of the soft-pack battery cell 22, while ensuring good protection for the soft-pack battery cell 22, and can effectively utilize the space inside the box 10, which is very important for improving the energy density of the battery device 100. For example, when designing a more compact battery device 100, the U-shaped shell 23 can arrange the soft-pack battery cells 22 in a more reasonable layout, and more soft-pack battery cells 22 can be loaded into the limited box 10, thereby increasing the total capacity of the battery device 100.

[0155] In the above technical solution, the outer shell 23 is set to the above-mentioned structure to facilitate the assembly of the battery pack 20, which is beneficial to improving assembly efficiency and reducing costs. It is also beneficial to subsequent maintenance and reducing the cost of use. It can also better restrain multiple soft-pack battery cells 22 while reducing the space occupied inside the box body 10, which is beneficial to improving the compactness of the spatial layout inside the battery device 100, and thus can improve the energy density of the battery device 100.

[0156] In some embodiments of the present application, reference Figure 4 The blocking member 40 is disposed at both ends of the battery pack 20 in the first direction X, and a portion of the blocking member 40 is in contact with or connected to the second shell wall 232 or the third shell wall 233 .

[0157] Part of the blocking member 40 may fit with the second shell wall 232 and the third shell wall 233. In this way, the blocking member 40 and the shell 23 can be more tightly combined, which can save space and facilitate the arrangement of more or larger battery packs 20 in the box 10, thereby improving the energy density of the battery device 100. For example, in combination with the foregoing, the blocking member 40 may include a first portion 41 and a second portion 42. The first portion 41 and the second portion 42 may be plate-shaped and vertically connected to each other. In this case, the second portion 42 may be arranged close to the second shell wall 232 or the third shell wall 233.

[0158] Part of the blocking member 40 can also be connected to the second shell wall 232 and the third shell wall 233. In this way, the blocking member 40 can support the soft-pack battery cell 22 on the first open side of the shell 23. For example, the bottom of the shell 23 forms a first opening, and the first surface 22a is the bottom surface of the soft-pack battery cell 22. When assembling the battery device 100, multiple soft-pack battery cells 22 can be first bonded to each other and then assembled into the shell 23. Then, part of the blocking member 40 is connected to the second shell wall 232 or the third shell wall 233 at the corresponding position, and the other part is supported on the first surface 22a of the soft-pack battery cell 22. Then, the battery pack 20 is bonded and fixed to the box body 10 through the glue layer 30. During the process, the blocking member 40 can not only prevent glue from overflowing, but also reduce the risk of the soft-pack battery cell 22 falling out of the shell 23, which can improve the installation reliability of the battery pack 20.

[0159] In the above technical solution, part of the blocking member 40 can be fitted with the second shell wall 232 or the third shell wall 233, thereby making the overall structure of the assembly formed by the blocking member 40 and the battery pack 20 more compact, saving space, and improving the energy density of the battery device 100. Part of the blocking member 40 can also be connected to the second shell wall 232 or the third shell wall 233, thereby the blocking member 40 and the outer shell 23 cooperate with each other to better restrain the multiple soft-pack battery cells 22 and surround the four sides of the assembly formed by the multiple soft-pack battery cells 22, which is conducive to reducing the risk of the soft-pack battery cells 22 falling off from the outer shell 23 during the assembly process, and can improve the installation reliability of the battery pack 20.

[0160] In some embodiments of the present application, reference Figure 7 and Figure 8 The first shell wall 231, the second shell wall 232 and the third shell wall 233 are located at both ends of the second direction Y to form a second opening, and the second direction Y is perpendicular to the first direction X and parallel to the first surface 22a; the blocking member 40 is constructed as a cover plate and is arranged at both ends of the second direction Y of the outer shell 23. The blocking member 40 includes a first part 41 and a second part 42 connected to each other, the first part 41 covers at least part of the first surface 22a, and the second part 42 closes the second opening.

[0161] The cover plate may be made of metal or non-metal. Metal materials may include but are not limited to aluminum alloy, stainless steel, etc., wherein when the cover plate is made of metal, an insulating layer may be provided on the surface to insulate the cover plate from the soft-pack battery cell 22. Non-metal materials may include but are not limited to ceramic materials, glass materials, plastic materials, rubber materials or mica materials, etc., wherein plastic materials may include but are not limited to polypropylene, polyetherimide, etc.

[0162] In the above technical solution, the blocking member 40 can integrate the function of a cover plate, and together with the outer shell 23, surround the four sides of the assembly composed of multiple soft-pack battery cells 22, thereby playing a better protective role and reducing the risk of the battery pack 20 being damaged by mechanical impact. The blocking member 40 is constructed as a cover plate and can cooperate with the outer shell 23 to better isolate the soft-pack battery cells 22 inside the battery pack 20 from other components in the box 10, which can play a certain electrical insulation role, reduce the risk of short circuit between the soft-pack battery cells 22 and the box 10 or other metal parts, and is conducive to improving the electrical reliability and maintaining a stable electrical environment inside the battery device 100. It can be seen that the use of the above structure is conducive to improving the reliability of the battery pack 20, and then improving the reliability of the battery device 100 as a whole.

[0163] In some embodiments of the present application, the blocking member 40 is made of an insulating material.

[0164] The insulating material may include but is not limited to ceramic material, glass material, plastic material, rubber material or mica material, etc., wherein the plastic material may include but is not limited to polypropylene, polyetherimide, etc.

[0165] It is understandable that the blocking member 40 , whether it is a separate component or constructed as a cover plate, can be made of insulating material, thereby enabling the blocking member 40 itself to have higher insulation properties, which is beneficial to improving the insulation protection performance of the blocking member 40 to the battery pack 20 .

[0166] Referring to the foregoing, the blocking member 40 can enhance the insulation between the battery pack 20 and the box body 10 by increasing the gap between the first surface 22a and the box body 10. On this basis, by setting the blocking member 40 as an insulating material, the blocking member 40 itself can have an insulating effect, thereby further enhancing the insulation between the soft-pack battery cell 22 and the box body 10, reducing the risk of short circuit, etc., and thereby improving the reliability of the battery pack 20.

[0167] It should be noted that, in combination with the foregoing, by limiting the ratio range of L2 / L1, not only can the blocking member 40 provide better protection for the soft-pack battery cell 22, but also appropriate insulation performance can be selected according to the size of the blocking member 40, thereby satisfying the insulation of the battery pack 20 and the box 10 under different requirements.

[0168] In the above technical solution, by making the blocking member 40 of insulating material, it is helpful to further enhance the insulation between the first surface 22a of the soft-pack battery cell 22 and the box 10, thereby improving the insulation between the battery pack 20 and the box 10, thereby improving the reliability of the battery device 100.

[0169] In some embodiments of the present application, reference Fig. 9 and Fig.10 The blocking member 40 is a current collecting component and is electrically connected to the soft-pack battery cell 22 . The blocking member 40 is provided with an insulating layer at least on a portion corresponding to the first surface 22 a .

[0170] The converging component may refer to a component that performs the function of converging and distributing current. In this technical solution, the anti-overflow glue function of the blocking member 40 may be integrated on the converging component. To ensure that the converging component can meet the conductive function, the converging component may refer to a portion corresponding to the first surface 22a having an insulating layer, or, except for the portion of the converging component connected to the conductive component (such as the pole, the wire, etc.), the rest of the portion is provided with an insulating layer. Thus, the blocking member 40 can achieve the insulation between the first surface 22a of the soft-pack battery cell 22 and the box body 10 while meeting the anti-overflow glue function.

[0171] The insulating layer may refer to an insulating film or insulating coating covering the busbar component, wherein the material of the insulating layer may include but is not limited to ceramic material, glass material, plastic material, rubber material or mica material, etc., wherein the plastic material may include but is not limited to polypropylene, polyetherimide, etc.

[0172] In the above technical solution, by setting the blocking member 40 as a conduit component, the function of preventing glue overflow can be integrated into the conduit component, thereby reducing the number of components of the battery device 100, saving space, reducing weight, and improving the energy density of the battery device 100.

[0173] In some embodiments of the present application, reference Fig.11 The blocking member 40 is constructed as a shell component of an insulating material and forms a storage space. At least part of the multiple soft-pack battery cells 22 are arranged in the storage space, and part of the blocking member 40 is bent in a direction close to the first surface 22a.

[0174] When the blocking member 40 is constructed as a shell component of an insulating material, the shell component may be U-shaped, rectangular or cylindrical, etc., and it can also be understood that the blocking member 40 can replace the function of the shell 23 of the previous embodiment. Exemplarily, taking the shell component of the blocking member 40 as a U-shape as an example, the blocking member 40 may include a first portion 41 and a second portion 42, the first portion 41 may cover at least a portion of the first surface 22a, and the second portion 42 may form a U-shaped shell structure, for example, the second portion 42 may form the first shell wall 231, the second shell wall 232 and the third shell wall 233 mentioned above.

[0175] The material of the shell component of the blocking member 40 may be, but is not limited to, ceramic, glass, plastic, rubber or mica, etc., wherein the plastic material may include, but is not limited to, polypropylene, polyetherimide, etc.

[0176] In the above technical solution, by constructing the blocking member 40 as a shell component, the blocking member 40 can integrate the shell function, thereby reducing the number of parts and components, reducing the weight of the battery pack 20, and thus improving the energy density of the battery device 100, and it is also beneficial to reduce the assembly steps and improve the assembly efficiency. The blocking member 40 is set as a shell component of an insulating material, which can also improve electrical insulation, reduce the risk of short circuit between the soft-pack battery cell 22 and the box 10 or other metal parts, and can provide a stable electrical environment for the battery pack 20, thereby improving the overall reliability of the battery device 100.

[0177] In some embodiments of the present application, reference Figure 4 The wall thickness of the blocking member 40 is H, wherein 1 mm ≤ H ≤ 3 mm.

[0178] H may be, but is not limited to, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc. It is understandable that if H is less than 1mm, the thickness of the blocking member 40 is relatively small, and it cannot provide good protection and insulation. For example, if the thickness of the blocking member 40 is relatively small, the risk of the processing burrs of the box body 10 or external sharp objects piercing the blocking member 40 and piercing the soft-pack battery cell 22 increases, and the effect of increasing the gap between the first surface 22a and the box body 10 is relatively poor, and it cannot provide good insulation effect; when the blocking member 40 is made of insulating material, the thickness of the blocking member 40 is relatively small, resulting in that the blocking member 40 itself cannot provide high insulation.

[0179] Considering that the processing burrs of the box body 10 are generally less than 3 mm, if H is greater than 3 mm, the thickness of the blocking member 40 is relatively large, which will lead to excessive protection performance, and the increased gap between the first surface 22a and the box body 10 is also relatively large, which has far exceeded the insulation requirements. When the blocking member 40 is made of an insulating material, its own insulation will also exceed expectations. That is to say, if H is greater than 3 mm, the protection performance and insulation performance of the blocking member 40 will be excessive, and it will occupy a larger space, which is not conducive to the compact design of the battery device 100, nor is it conducive to improving the energy density of the battery device 100.

[0180] It should be noted that, depending on the material of the blocking member 40, the blocking member 40 may have different wall thicknesses. For example, when the blocking member 40 is made of polyetherimide (PEI), the blocking member 40 not only meets the function of preventing glue from overflowing, but also has insulation properties. At this time, the wall thickness of the blocking member 40 may be 2 mm, and the size of the portion corresponding to the first surface 22a in the first direction X may be 7 mm. When the blocking member 40 is made of aluminum, it may be designed to be L-shaped, and an insulating layer may be provided on the surface. At this time, the thickness of the blocking member 40 may be 1 mm, and the size of the portion corresponding to the first surface 22a in the first direction X may be 5 mm. When the blocking member 40 is made of polypropylene (PP), it may also be designed to be L-shaped, and the thickness of the blocking member 40 may be 1.5 mm, and the size of the portion corresponding to the first surface 22a in the first direction X may be 6 mm.

[0181] In the above technical solution, by setting the wall thickness of the blocking member 40 within the above range, the thickness of the blocking member 40 can be reduced as much as possible while satisfying the protection and insulation properties, thereby saving the space occupied by the blocking member 40 and reducing the weight of the blocking member 40, which is beneficial to the compact design of the battery device 100, and can reduce the overall weight of the battery device 100, and can improve the energy density of the battery device 100.

[0182] In some embodiments of the present application, the energy density of the soft-pack battery cell 22 is E, and the melting point of the barrier 40 is T1, wherein: when E≤390Wh / L, T1>150°C; when E>390Wh / L, T1>200°C.

[0183] When the energy density E of the soft-pack battery cell 22 is greater than or equal to 390Wh / L, the temperature of the soft-pack battery cell 22 when thermal runaway occurs exceeds 200°C. Therefore, the blocking member 40 may be selected from a material with a melting point greater than 200°C, which can reduce the risk of the blocking member 40 melting and causing performance damage during thermal runaway, and improve the high temperature resistance of the blocking member 40. When the energy density E of the soft-pack battery cell 22 is less than 390Wh / L, the temperature of the soft-pack battery cell 22 when thermal runaway occurs is less than 150 degrees. Therefore, the blocking member 40 may be selected from a material with a melting point greater than 150°C, which not only meets the high temperature resistance of the blocking member 40, but also helps to reduce costs.

[0184] For example, when the blocking member 40 is made of polypropylene (PP), the melting point is greater than or equal to 150°C; when the blocking member 40 is made of polyetherimide (PEI), the melting point is greater than or equal to 250°C; when the blocking member 40 is made of polyimide (PI), the melting point is greater than or equal to 300°C; when the blocking member 40 is made of aluminum with an insulating layer, the melting point is greater than or equal to 660°C; when the blocking member 40 is made of steel with an insulating layer, the melting point is greater than or equal to 1000°C.

[0185] In the above technical solution, by setting the melting point of the blocking member 40 and the energy density of the soft-pack battery cell 22 within the above range, the blocking member 40 can have suitable high temperature resistance, thereby improving the reliability of the blocking member 40, thereby improving the reliability of the battery device 100, while also taking into account the cost of the blocking member 40, which is beneficial to reducing the cost of the battery device 100.

[0186] In some embodiments of the present application, reference Figure 3 The box body 10 includes a plurality of box walls 111 , which together define a receiving space 10 a , and the first surface 22 a and the blocking member 40 are bonded to the box walls 111 via an adhesive layer 30 .

[0187] The box wall 111 may refer to a wall panel surrounding the box body 10. The multiple box walls 111 may include a bottom box wall, a top box wall, a side box wall, etc. In the above technical solution, the first surface 22a of the soft-pack battery cell 22 may be bonded and fixed to one of the bottom box wall, the top box wall, and the side box wall through the adhesive layer 30.

[0188] In the above technical solution, the first surface 22a of the soft-pack battery cell 22 and the blocking member 40 can be bonded and fixed to the box wall 111 of the box body 10 through the adhesive layer 30, so that the connection between the soft-pack battery cell 22 and the box body 10 is more secure.

[0189] In some embodiments of the present application, reference Figure 4 , Figure 7 , Fig. 9 and Fig.11The box body 10 includes a box body 101 and a heat exchange plate 102 . The heat exchange plate 102 is connected to the box body 101 and defines a receiving space 10a together with the box body 101 . The first surface 22a and the blocking member 40 are bonded to the heat exchange plate 102 through the adhesive layer 30 .

[0190] The heat exchange plate 102 may refer to a component that can perform heat exchange with the soft-pack battery cell 22 to adjust the temperature of the soft-pack battery cell 22. Exemplarily, the heat exchange plate 102 may be a cold plate. In this technical solution, the heat exchange plate 102 and the box body 101 may together form the box body 10. Among them, the heat exchange plate 102 may serve as a box wall 111 of the box body 10. For example, the box body 101 has no bottom wall, and the heat exchange plate 102 is connected to the bottom of the box body 101, serving as the bottom wall of the entire box body 10; the heat exchange plate 102 may also be provided on any wall panel of the box body 101, and together with the corresponding wall panel, form a box wall 111 of the box body 10.

[0191] In the above technical solution, by bonding the first surface 22a of the soft-pack battery cell 22 and the blocking member 40 to the heat exchange plate 102 through the adhesive layer 30, the heat exchange plate 102 can efficiently exchange heat with the soft-pack battery cell 22 and quickly adjust the temperature of the soft-pack battery cell 22, which is beneficial to improving the reliability of the soft-pack battery cell 22 and further improving the reliability of the battery device 100.

[0192] In some embodiments of the present application, reference Figure 4 , Figure 7 , Fig. 9 and Fig.11 The heat exchange plate 102 is arranged at the bottom of the box body 101.

[0193] In the above technical solution, since the heat exchange plate 102 is arranged between the soft-pack battery cell 22 and the bottom wall of the box body 101, the heat exchange plate 102 can not only efficiently exchange heat for the soft-pack battery cell 22, but also play a protective role. When the bottom of the box body 10 is subjected to external mechanical impact, the heat exchange plate 102 can play a buffering role, reducing the damage caused by the external mechanical impact to the soft-pack battery cell 22, thereby reducing the risk of damage to the soft-pack battery cell 22, improving the reliability of the battery pack 20, and further improving the reliability of the battery device 100.

[0194] In some embodiments of the present application, the soft-pack battery cell 22 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0195] The solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell may also be a semi-solid-state battery cell or a fully solid-state battery cell.

[0196] In the above technical solution, the soft-pack battery cell 22 adopts the above types to provide more options for the design of the battery device to meet different usage requirements. Among them, the soft-pack battery cell 22 is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the soft-pack battery cell 22 is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery cell 22 is a solid-state battery cell, which has the advantages of high energy density and high reliability, light weight, and good high and low temperature performance.

[0197] In some embodiments of the present application, the soft-pack battery cell 22 is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell 22, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (1-3): (1-3); the soft-pack battery cell 22 is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell 22, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (2-3): (1-2).

[0198] In some embodiments, the positive electrode of the soft-pack battery cell 22 may be a positive electrode sheet, which may include a positive electrode collector and a positive electrode film layer disposed on at least one surface of the positive electrode collector, wherein the positive electrode film layer includes a positive electrode active material.

[0199] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0200] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0201] As an example, when the soft-pack battery cell 22 of the embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell 22. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0202] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0203] Layered transition metal oxides include those of the general formula Li a Ni b Co c M d O e A f At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0204] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 )、LiNi 0.9 Co 0.05 Mn 0.05 O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15Al 0.05 O2) and its modified compounds, etc.

[0205] When the soft-pack battery cell 22 of the embodiment of the present application is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0206] As an example, the positive electrode active material for sodium ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi 1 / 2 Ti 1 / 2 O2、NaNi 1 / 2 Mn 1 / 2 O2、Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O2、NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, general formula X p M' q (PO4) r O x Y 3-x In the general formula X p M' q (PO4) r O x Y 3-x , 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0207] In the embodiments of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0208] The soft-pack battery cell 22 is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process, and the molar content of Li is different when the soft-pack battery cell 22 is discharged to different states. In the examples of the positive electrode active materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after the charge and discharge cycle.

[0209] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. In reality, the molar content of oxygen O will fluctuate.

[0210] In the embodiments of the present application, the content of the elements in the positive electrode active material is a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180 ° C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0211] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0212] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0213] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0214] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0215] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0216] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0217] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0218] As an example, the negative electrode active material may adopt the negative electrode active material for soft-pack battery cells 22 known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0219] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, such as a silicon-based material that may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can increase the energy density of the soft-pack battery cell 22.

[0220] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. In the soft-pack battery cell 22 system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery cell 22 can be improved.

[0221] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0222] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0223] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0224] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0225] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0226] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0227] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0228] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0229] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0230] The porous base membrane may include one or more of polyethylene and polypropylene.

[0231] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0232] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0233] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0234] In some embodiments, the pouch cell 22 further includes an electrolyte.

[0235] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. The present application embodiment has no particular limitation on the type of electrolyte, which can be selected according to actual needs.

[0236] The electrolyte includes electrolyte salt and solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0237] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0238] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0239] It can be understood that when the soft-pack battery cell 22 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 22, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0240] For example, when the soft-pack battery cell 22 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which may refer to LiFePO4, i.e., lithium iron phosphate), the binder may be PVDF (polyvinylidene fluoride), and the conductive agent may be conductive carbon black, wherein LFP:PVDF:conductive carbon black may be 96:2:2, that is, the total weight of the positive electrode active material is 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit of the positive electrode active material may be grams.

[0241] When the soft-pack battery cell 22 is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 22, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but not limited to nickel cobalt manganese lithium oxide system, nickel cobalt aluminum lithium oxide system, etc.

[0242] For example, the ternary material of the ternary battery cell can be eight series LiNi 0.8 Co 0.1 Mn 0.1 O2, the weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5, that is, the total weight of the positive electrode material is divided into 100 parts, eight series LiNi 0.8 Co 0.1 Mn 0.1 O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0243] In the above technical solution, when the soft-pack battery cell 22 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output a higher amount of electricity in a relatively small volume and weight, meeting the application scenario with certain requirements for energy density. The amount of the binder and the conductive agent used in the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 22 is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the positive electrode active material, binder, and conductive agent in the above-mentioned dosage ratio is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and reducing the risk of active material shedding and electrode pulverization during charging and discharging, and extending the cycle life of the battery device 100.

[0244] In some embodiments of the present application, the soft-pack battery cell 22 is a ternary battery cell, the battery pack 20 includes an outer shell 23, the outer shell 23 has a first opening open toward the first surface 22a, a plurality of soft-pack battery cells 22 are accommodated in the outer shell 23, and a shell wall of the outer shell 23 away from the first opening is provided with a pressure relief portion 24.

[0245] In the above technical solution, when the ternary battery cell undergoes thermal runaway expansion and exhaust pressure relief, the pressure relief portion 24 can guide the exhausted gas to directional pressure relief, thereby reducing the risk of the surrounding ternary battery cells being affected by the chaotic flow of gas, and also reducing the risk of serious thermal runaway of the battery pack 20 composed of the ternary battery cells, which is beneficial to the thermal runaway management of the battery pack 20 and improves the reliability of the battery pack 20 composed of the ternary battery cells.

[0246] In some embodiments of the present application, the pressure relief portion 24 is configured as a pressure relief hole; or, the pressure relief portion 24 is configured as a notch; or, the pressure relief portion 24 is configured as a weakened portion. In the above technical solution, more options can be provided for the design of the pressure relief portion 24 to meet different usage requirements.

[0247] The embodiment of the present application further provides an electric device 1000 , comprising the battery device 100 as described in any of the above embodiments.

[0248] In the above technical solution, since the battery device 100 has high reliability, the use of the battery device 100 can improve the power consumption reliability of the power consumption device 1000.

[0249] A specific embodiment of the battery device 100 of the present application is described below.

[0250] Embodiment 1

[0251] Reference Figure 4 and Figure 5 The battery device 100 provided in the embodiment of the present application includes: a box body 10, a battery pack 20, a glue layer 30 and a blocking member 40.

[0252] The box 10 has a storage space 10a. The battery pack 20 is disposed in the storage space 10a and includes a shell 23 and a plurality of soft-pack battery cells 22. The shell 23 is a U-shaped shell with an open bottom. The plurality of soft-pack battery cells 22 are sequentially bonded and matched along a first direction X and are located in the shell 23.

[0253] The blocking member 40 is made of polyetherimide (PEI) and is L-shaped. The blocking member 40 is bonded to the four corners of the bottom surface of the battery pack 20. The portion of the blocking member 40 corresponding to the bottom surface of the battery pack 20 has a size of 7 mm in the first direction X and a thickness of 2 mm.

[0254] Embodiment 2

[0255] Reference Fig. 9 and Fig.10The structure of the battery device 100 provided in the second embodiment is substantially the same as that of the battery device 100 in the first embodiment, except that the blocking member 40 is constructed as a collector component and is disposed at open positions on both sides of the U-shaped housing 23. The collector component is made of aluminum with an insulating layer and is L-shaped and welded to the pole of the soft-pack battery cell 22. The portion of the collector component corresponding to the bottom surface of the battery pack 20 in the second direction Y has a size of 5 mm and a thickness of 1 mm. The second direction Y is perpendicular to the first direction X and parallel to the bottom surface of the battery pack 20.

[0256] Embodiment 3

[0257] Reference Figure 7 and Figure 8 The structure of the battery device 100 provided in the third embodiment is substantially the same as that of the battery device 100 in the first embodiment, except that the blocking member 40 is constructed as a cover plate and is disposed at the open positions on both sides of the U-shaped housing 23. The cover plate is made of polypropylene (PP) and is L-shaped. The size of the portion of the cover plate corresponding to the bottom surface of the battery pack 20 in the second direction Y is 6 mm and the thickness is 1.5 mm. The second direction Y is perpendicular to the first direction X and parallel to the bottom surface of the battery pack 20.

[0258] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, if there is no special explanation, all the embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If there is no special explanation, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box body having a containing space; A battery pack is arranged in the accommodation space and includes a plurality of soft-pack battery cells bonded and matched in sequence along a first direction, wherein the soft-pack battery cells have a first surface and a second surface, and the second surface is adjacent to the first surface; An adhesive layer, disposed on one side of the battery pack located on the first surface, and used to adhere the plurality of soft-pack battery cells to the box body; A blocking member is arranged in the accommodating space and is located at least between at least one of the soft-pack battery cells and the adhesive layer at both ends of the battery pack in the first direction, and is used to prevent the adhesive layer from overflowing from the first surface of the soft-pack battery cell to the corresponding second surface of the soft-pack battery cell. The blocking member at least covers the corner position of the corresponding soft-pack battery cell.

2. The battery device according to claim 1, characterized in that: The blocking member at least covers an edge position corresponding to the soft-pack battery cell in the first direction.

3. The battery device according to claim 2, characterized in that: The area of ​​the orthographic projection of the blocking member on the plane where the first surface is located is smaller than the sum of the areas of all the first surfaces.

4. The battery device according to claim 1, characterized in that: The blocking members are disposed at two ends of the battery pack in the first direction. In the first direction, the size of the battery pack is L1, and the size of the blocking member is L2, wherein 0.05≤L2 / L1.

5. The battery device according to claim 4, characterized in that: 0.05≤L2 / L1≤0.

15.

6. The battery device according to claim 1, characterized in that: The blocking member includes a first portion and a second portion connected to each other, the first portion covers at least a portion of the first surface, and the second portion is bent relative to the first portion in a direction away from the adhesive layer.

7. The battery device according to claim 1, characterized in that: The battery pack includes a housing having a first opening opened toward the first surface, and a plurality of the soft-pack battery cells are accommodated in the housing.

8. The battery device according to claim 7, characterized in that: The shell is made of metal or non-metal.

9. The battery device according to claim 8, characterized in that: The shell is made of stainless steel or aluminum.

10. The battery device according to claim 7, characterized in that: A pressure relief portion is provided on a shell wall of the shell away from the first opening.

11. The battery device according to claim 10, 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.

12. The battery device according to claim 7, characterized in that: The shell includes a first shell wall, a second shell wall and a third shell wall. The second shell wall and the third shell wall are connected to two ends of the first shell wall in the first direction. The first opening is formed between the second shell wall and the third shell wall.

13. The battery device according to claim 12, characterized in that: The blocking member is disposed at two ends of the battery pack in the first direction, and a portion of the blocking member is in contact with or connected to the second shell wall or the third shell wall.

14. The battery device according to claim 12, characterized in that: The first shell wall, the second shell wall and the third shell wall form a second opening at both ends of the second direction, and the second direction is perpendicular to the first direction and parallel to the first surface; the blocking member is constructed as a cover plate and is arranged at both ends of the second direction of the shell, and the blocking member includes a first part and a second part that are connected, the first part covers at least part of the first surface, and the second part closes the second opening.

15. The battery device according to any one of claims 1 to 14, characterized in that: The blocking member is made of insulating material.

16. The battery device according to any one of claims 1 to 13, characterized in that: The blocking member is a current collecting component and is electrically connected to the soft-pack battery cell. The blocking member is provided with an insulating layer at least on a portion corresponding to the first surface.

17. The battery device according to any one of claims 1 to 6, characterized in that: The blocking member is constructed as a shell component of an insulating material and forms a storage space. At least part of the plurality of soft-pack battery cells are arranged in the storage space, and part of the blocking member is bent toward the first surface.

18. The battery device according to any one of claims 1 to 14, characterized in that: The wall thickness of the blocking member is H, wherein 1 mm ≤ H ≤ 3 mm.

19. The battery device according to any one of claims 1 to 14, characterized in that: The energy density of the soft-pack battery cell is E, and the melting point of the barrier is T1, wherein: When E≤390Wh / L, T1>150℃; When E>390Wh / L, T1>200℃.

20. The battery device according to any one of claims 1 to 14, characterized in that: The box body includes a plurality of box walls, which together define the accommodating space, and the first surface and the blocking member are bonded to the box walls via the adhesive layer.

21. The battery device according to any one of claims 1 to 14, characterized in that: The box body includes a box body body and a heat exchange plate. The heat exchange plate is connected to the box body body and defines the accommodating space together with the box body body. The first surface and the blocking member are bonded to the heat exchange plate through the adhesive layer.

22. The battery device according to claim 21, characterized in that The heat exchange plate is arranged at the bottom of the box body.

23. The battery device according to any one of claims 1 to 7 and 12 to 14, 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.

24. The battery device according to claim 23, characterized in that The soft-pack battery cell is a ternary battery cell. The battery pack includes a shell having a first opening facing the first surface. A plurality of the soft-pack battery cells are accommodated in the shell. A pressure relief portion is provided on a shell wall of the shell away from the first opening.

25. The battery device according to claim 24, 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.

26. An electrical device, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 25.

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