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, the first side of the battery pack is adhered to the box body, the battery pack comprises a plurality of soft package battery monomers which are arranged side by side, and a gap is formed between every two adjacent soft package battery monomers; wherein at least one soft package battery monomer is provided with an edge sealing bending part on the first side, and the edge sealing bending part is bent towards any adjacent gap and at least seals the corresponding gap. According to the utility model, the edge sealing bending parts can play a role in preventing glue overflow, so that the risk that glue overflows into gaps among the soft package battery monomers is reduced, the probability that hard structures are formed among the soft package battery monomers due to the overflow glue is reduced, and the risk that the soft package battery monomers have relatively large local stress is reduced; the occurrence of lithium separation caused by damage of the shell of the soft package battery monomer is reduced, the reliability 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 disposed in the accommodating space, and a first side of the battery pack is bonded to the box body, the battery pack comprising a plurality of soft-pack battery cells arranged side by side, and gaps are formed between adjacent soft-pack battery cells; wherein at least one soft-pack battery cell is provided with an edge sealing bending portion on the first side, the edge sealing bending portion is bent toward any adjacent gap and at least closes the corresponding gap.

[0005] In the above technical solution, at least one soft-pack battery cell is provided with an edge-sealing bent portion on the first side, and the edge-sealing bent portion is bent toward the gap formed between any two adjacent soft-pack battery cells and at least closes the corresponding gap, so that the edge-sealing bent portion can play a role in preventing glue overflow, and can reduce the risk of glue overflowing into the gap between the soft-pack battery cells during the assembly and gluing process of the battery device, and reduce the probability of forming a hard structure between the soft-pack battery cells due to glue overflow, and can also reduce the risk of large local stress in the soft-pack battery cell, reduce the shell of the soft-pack battery cell damage and cause lithium deposition, can improve the reliability of the soft-pack battery cell, and then improve the reliability of the battery device.

[0006] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, the battery pack has a second side, the second side is arranged at both ends of the first side in the first direction, and at least one edge sealing bending portion is bent in a direction close to the second side.

[0007] In the above technical solution, the edge sealing bent portion can also prevent the glue from overflowing to the second side of the battery pack, reducing the risk of glue overflowing to form a hard structure on the second side of the battery pack, thereby reducing the probability of local stress on the second side of the battery pack causing damage to the soft-pack battery cell and lithium deposition. In other words, by preventing the gap at the first side and the glue from overflowing on the second side, the reliability of the battery pack can be further improved, thereby improving the reliability of the battery device.

[0008] In some embodiments of the present application, the portion of the edge sealing bent portion that is bent toward the second side is a flange portion, and the flange portion is in contact with the second side.

[0009] In the above technical solution, the flange portion formed by bending the edge sealing bending portion and the second side are fitted together, which can reduce the risk of glue overflow on the side of the outermost soft-pack battery cell located on the second side, and also reduce the probability of forming a hard structure. This can further reduce the risk of lithium plating caused by damage to the side of the outermost soft-pack battery cell located on the second side, thereby further improving the reliability of the battery pack.

[0010] In some embodiments of the present application, the portion of the edge sealing bent portion bent toward the second side is a flange portion, the dimension of the flange portion's positive projection on the second side in the second direction is less than or equal to 3 mm, and the second direction is perpendicular to the first side.

[0011] In the above technical solution, by setting the size of the orthographic projection of the flange portion on the second side in the second direction within the above range, the size of the flange portion can be set within an appropriate range, so that the flange portion can reduce material usage and manufacturing costs while satisfying the requirement of having a good anti-overflow glue effect on the second side of the battery pack, and is also beneficial for making the battery pack lighter and improving the energy density of the battery device.

[0012] In some embodiments of the present application, each soft-pack battery cell is provided with an edge-sealing bending portion.

[0013] In the above technical solution, each soft-pack battery cell can be provided with an edge-sealing bent portion, and used to close the gaps at adjacent positions. When all gaps of the battery pack are closed, the size of the edge-sealing bent portion can be reduced, thereby simplifying the structure of the edge-sealing bent portion and reducing the manufacturing cost. Moreover, the structure of each soft-pack battery cell can be kept consistent, and the assembly order of multiple soft-pack battery cells does not need to be considered, which is conducive to reducing the difficulty of assembly and improving assembly efficiency.

[0014] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, and the edge sealing bending portion is connected to a middle position of the soft-pack battery cell in the first direction.

[0015] In the above technical solution, the setting position of the edge sealing bending part of each soft-pack battery cell can be kept consistent, so that the fixing effect of the edge sealing bending part on the soft-pack battery cell and the sealing effect on the gap are relatively evenly distributed in the first direction, which can reduce the risk of uneven force on the soft-pack battery cell and local looseness due to unreasonable connection position, which is beneficial to maintaining the neatness of the arrangement of the soft-pack battery cells of the battery pack in the first direction and the stability of the overall structure, thereby improving the reliability of the battery device.

[0016] In some embodiments of the present application, in the first direction, the size of the soft-pack battery cell is L1, and the size of the edge-sealing bent portion is L2, wherein 0.5<L2 / L1≤1.

[0017] In the above technical solution, by setting the size ratio of the edge sealing bending portion and the soft-pack battery cell in the first direction within the above range, the edge sealing bending portion can provide better support for the soft-pack battery cell while ensuring that the gap has a good anti-overflow glue effect, thereby reducing the risk of local stress concentration on the surface of the soft-pack battery cell on the first side, thereby further improving the reliability of the soft-pack battery cell and further improving the reliability of the battery device.

[0018] In some embodiments of the present application, 0.75≤L2 / L1≤1. In this technical solution, by further accurately controlling the range of L2 / L1, the sealing effect of the edge sealing bending portion on the gap can be further improved, and the risk of glue overflowing into the gap can be reduced, which can further improve the reliability of the battery pack and further improve the reliability of the battery device.

[0019] In some embodiments of the present application, the orthographic projections of any two adjacent edge-sealing bent portions on the first side at least partially overlap.

[0020] In the above technical solution, the above solution can enable the two adjacent edge-sealing bent portions to have a better covering effect on the surface of the soft-pack battery monomer located on the first side, which can further reduce the risk of glue overflowing into the gap, and can also reduce the contact between the glue and the surface of the soft-pack battery monomer located on the first side. When the soft-pack battery monomer is removed from the box body at a later stage, the edge-sealing bent portion can be directly cut off without damaging the soft-pack battery monomer, which is conducive to the removal of the soft-pack battery monomer.

[0021] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, and the battery pack has a second side, and the second side is arranged at both ends of the first side located in the first direction; wherein, of the two of the multiple soft-pack battery cells located at both ends of the first direction, the edge sealing bending portion of one is bent in a direction close to the second side, and the other is provided with two edge sealing bending portions, and the one of the two edge sealing bending portions away from the corresponding gap is bent in a direction close to the other second side.

[0022] In the above technical solution, the above solution can prevent the gap of the battery pack on the first side and the second side at both ends of the first direction from overflowing glue, reduce the risk of overflowing glue forming a hard structure in the gap and the second side, and reduce the probability of local stress concentration causing damage to the soft-pack battery cell and causing lithium precipitation, thereby playing a more comprehensive protective role and helping to improve the reliability of the battery device. Moreover, the use of this structure can reduce the number of parts while satisfying the requirement of having a good anti-overflow glue effect on the second side. Multiple soft-pack battery cells can reduce the assembly steps during the assembly stage, and the assembly is simple, which can improve the assembly efficiency.

[0023] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, and the battery pack has a second side, and the second side is arranged at both ends of the first side in the first direction; wherein, of the two of the plurality of soft-pack battery cells located at both ends of the first direction, the edge sealing bending portion of one is bent toward a direction close to the second side, and a blocking member is provided at the position of the other, and the blocking member is arranged on the first side and bent toward a direction close to the second side.

[0024] In the above technical solution, by setting a separate blocking member, the structures of each soft-pack battery cell can be kept consistent while satisfying the gap on the first side of the battery pack and preventing the second side at both ends of the first direction from overflowing the glue. There is no need to consider the assembly sequence during the assembly stage, which facilitates assembly and is also conducive to simplifying the structure of the soft-pack battery cell, which can improve manufacturability and reduce manufacturing costs.

[0025] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, and one of the plurality of soft-pack battery cells located at one end of the first direction is provided with an edge-sealing bending portion, which extends along the first direction and closes all gaps.

[0026] In the above technical solution, only one of the multiple soft-pack battery cells may be provided with a sealing edge bending portion, and all gaps can be closed by the sealing edge bending portion, thereby simplifying the structure of other soft-pack battery cells while satisfying the function of preventing glue overflow from the gap on the first side of the battery pack, which is beneficial to reducing the manufacturing complexity of most soft-pack battery cells, thereby reducing the manufacturing cost, thereby reducing the overall manufacturing cost of the battery pack.

[0027] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, a size of the soft-pack battery cell in a third direction is larger than a size in the first direction, and the third direction is perpendicular to the first direction and parallel to the first side.

[0028] In the above technical solution, the shape of the soft-pack battery cell can be an elongated strip, and the soft-pack battery cell of this shape is easy to be combined into a battery pack with a larger capacity, thereby increasing the battery capacity of the battery device. The elongated soft-pack battery cell also has a larger surface area to volume ratio, with more surface area for heat exchange, so that the heat can be dissipated faster, which is conducive to maintaining the stability of battery performance, thereby improving the reliability of the battery device.

[0029] In some embodiments of the present application, a plurality of soft-pack battery cells are arranged side by side along a first direction, the battery pack includes a shell having an opening opened toward a first side, and at least a portion of the plurality of soft-pack battery cells are accommodated in the shell.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In some embodiments of the present application, a pressure relief portion is provided on the shell wall away from the 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 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.

[0034] 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.

[0035] 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 two ends of the first shell wall in the first direction, and an opening is formed between the second shell wall and the third shell wall.

[0036] 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.

[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 side and the edge sealing bent portion are bonded to the box walls.

[0038] In the above technical solution, the surface of the soft-pack battery cell located on the first side can be fixed to the box wall of the box body by gluing, 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 body includes a box body main body and a heat exchange plate, the heat exchange plate is connected to the box body and defines a receiving space together with the box body, and the first side and the edge sealing bent portion are bonded to the heat exchange plate.

[0040] In the above technical solution, by gluing and fixing the surface of the soft-pack battery cell on the first side to the heat exchange plate, 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 an opening open toward the first side, a plurality of soft-pack battery cells are accommodated in the shell, and a shell wall of the shell away from the 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 provides an electrical device, comprising a battery device as described in any of the above.

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

[0056] Figure 4 A schematic diagram of the structure of a battery pack provided in another embodiment of the present application;

[0057] Figure 5 A schematic diagram of the structure of a battery pack provided in yet another embodiment of the present application;

[0058] Figure 6 A schematic diagram of the structure of a battery pack provided in yet another embodiment of the present application;

[0059] Figure 7 A schematic diagram of the structure of a battery pack provided in some other embodiments of the present application;

[0060] Figure 8 A schematic diagram of the three-dimensional structure of a battery pack provided in some embodiments of the present application;

[0061] Fig. 9 An exploded view of a battery pack provided for some embodiments of the present application;

[0062] Fig.10 A schematic diagram of the partial structure of a battery device provided in some embodiments of the present application.

[0063] icon:

[0064] 1000. Electrical devices;

[0065] 100. Battery device;

[0066] 10, box body; 11, first box body; 12, second box body; 10a, accommodating space; 111, box wall; 101, box body; 102, heat exchange plate;

[0067] 20. Battery pack; 21. Battery cell; 20a. Gap; 201. First side; 202. Second side; 22. Soft-pack battery cell; 221. Edge-sealing bending portion; 2211. Flanging portion; 23. Shell; 23a. Opening; 231. First shell wall; 232. Second shell wall; 233. Third shell wall; 24. Pressure relief portion;

[0068] 30. blocking member; 40. adhesive layer;

[0069] 200, controller; 300, motor; X, first direction; Z, second direction; Y, third direction. DETAILED DESCRIPTION

[0070] 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.

[0071] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The term “plurality” used in this application refers to two or more (including two).

[0077] In the present application, 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-acid batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be cylindrical, flat, rectangular or other shapes, which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0078] 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.

[0079] 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.

[0080] 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 module, and the battery cell assembly may be accommodated in the housing by fixing the battery module 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.

[0081] The battery cell includes a shell, an electrode assembly and an electrolyte. The shell is used to contain 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.

[0082] 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.

[0083] 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.

[0084] In general battery devices, glue is usually applied to the bottom of soft-pack battery cells during production and assembly, so as to fix the soft-pack battery cells in the box and ensure the installation reliability of the soft-pack battery cells inside the box. However, since a gap will be formed between any two adjacent soft-pack battery cells in the scheme where multiple soft-pack battery cells are arranged side by side, the glue is more likely to overflow upward into the gap between two adjacent soft-pack battery cells during the glue application process. After the overflow glue solidifies, it will form a hard structure, resulting in greater local stress in the soft-pack battery cells, thereby increasing the risk of damage to the soft shell of the soft-pack battery cells, and then causing lithium plating problems, affecting the reliability of the soft-pack battery cells, and then affecting the reliability of the battery device as a whole.

[0085] 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 body and a battery pack, the box body has a storage space; the battery pack is arranged in the storage space, and the first side of the battery pack is bonded to the box body, the battery pack includes a plurality of soft-pack battery cells arranged side by side, and gaps are formed between adjacent soft-pack battery cells; wherein at least one soft-pack battery cell is provided with an edge-sealing bending portion on the first side, the edge-sealing bending portion is bent toward any adjacent gap, and at least the corresponding gap is closed.

[0086] In a battery device of this structure, at least one soft-pack battery cell is provided with an edge-sealing bent portion on the first side, and the edge-sealing bent portion is bent toward a gap formed between any two adjacent soft-pack battery cells and at least closes the corresponding gap, so that the edge-sealing bent portion can play a role in preventing glue overflow, and can reduce the risk of glue overflowing into the gap between the soft-pack battery cells during the assembly and gluing process of the battery device, and reduce the probability of forming a hard structure between the soft-pack battery cells due to glue overflow, and can also reduce the risk of large local stress in the soft-pack battery cells, and reduce the occurrence of lithium precipitation due to damage to the shell of the soft-pack battery cells, which can improve the reliability of the soft-pack battery cells, and thus improve the reliability of the battery device.

[0087] The battery 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 a battery device disclosed in the present application.

[0088] 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.

[0089] 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 1The 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] According to some embodiments of the present application, referring to Figure 3 and Figure 4 The embodiment of the present application provides a battery device 100, including: a box body 10 and a battery pack 20, the box body 10 has a accommodating space 10a; the battery pack 20 is arranged in the accommodating space 10a, and the first side 201 of the battery pack 20 is bonded to the box body 10, the battery pack 20 includes a plurality of soft-pack battery cells 22 arranged side by side, and a gap 20a is formed between adjacent soft-pack battery cells 22; wherein, at least one soft-pack battery cell 22 is provided with an edge-sealing bending portion 221 on the first side 201, and the edge-sealing bending portion 221 is bent toward any adjacent gap 20a and at least closes the corresponding gap 20a.

[0096] 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.

[0097] The battery pack 20 may refer to a module composed of a plurality of soft-pack battery cells 22. The soft-pack battery cell 22 may refer to a battery cell 21 whose shell is made of a soft material. For example, the soft material may be an aluminum-plastic film. 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 .

[0098] The first side 201 may refer to a side of the battery pack 20, or to a side where a plurality of soft-pack battery cells 22 can be bonded and connected to the box body 10. For example, when a plurality of soft-pack battery cells 22 are arranged side by side in a horizontal direction, the first side 201 may refer to the top side or the bottom side of the battery pack 20. Figure 4 The first side 201 may refer to a side portion of the battery pack 20 at one end of the second direction Z. The second direction Z may refer to a direction perpendicular to the first direction X. Figure 4 , the second direction Z may refer to the height direction of the battery pack 20 .

[0099] The edge-sealing bent portion 221 may refer to the redundant portion of the soft material forming the shell of the soft-pack battery cell 22 during packaging. For example, the soft shell of the soft-pack battery cell 22 may be an aluminum-plastic film, and the redundant folded portion after folding both ends of the aluminum-plastic film may form the edge-sealing bent portion 221.

[0100] Among the multiple soft-pack battery cells 22 of the battery pack 20, only one soft-pack battery cell 22 may be provided with an edge-sealing bent portion 221 on the first side 201, and the edge-sealing bent portion 221 may be bent toward the adjacent gap 20a and close the adjacent gap 20a, or may close more than two gaps 20a, or may close all gaps 20a (see Figure 5). For example, a plurality of soft-pack battery cells 22 may be arranged along the first direction X, and a plurality of soft-pack battery cells 22 may be provided with an edge-sealing bending portion 221 in the middle, and the edge-sealing bending portion 221 may be bent toward both ends of the first direction X and cover all gaps 20a. A plurality of soft-pack battery cells 22 may be provided with an edge-sealing bending portion 221 at one end of the first direction X, and the edge-sealing bending portion 221 may close all gaps 20a.

[0101] Among the multiple soft-pack battery cells 22 of the battery pack 20, a partial number of the soft-pack battery cells 22 may be provided with an edge-sealing bent portion 221 on the first side 201. In the partial number of edge-sealing bent portions 221, each edge-sealing bent portion 221 is bent toward an adjacent gap 20a and can close the adjacent gap 20a, or can close more than two gaps 20a. Thus, the edge-sealing bent portions 221 of a partial number of the soft-pack battery cells 22 can close multiple gaps 20a or all the gaps 20a together.

[0102] Among the multiple soft-pack battery cells 22 of the battery pack 20, all the soft-pack battery cells 22 may be provided with an edge-sealing bent portion 221 on the first side 201 (see Figure 4 ), each edge-sealing bent portion 221 can be bent toward an adjacent gap 20a and close the adjacent gap 20a, so that the edge-sealing bent portions 221 of multiple soft-pack battery cells 22 can jointly close all the gaps 20a; or, each edge-sealing bent portion 221 can also close more than two gaps 20a, and the edge-sealing bent portions 221 of multiple soft-pack battery cells 22 can jointly close all the gaps 20a.

[0103] During the assembly process of the battery device 100, when the multiple soft-pack battery cells 22 of the battery pack 20 are fixed to the box body 10 by glue on the first side 201, the edge sealing and bending portions 221 of the soft-pack battery cells 22 can close one or more gaps 20a, which is conducive to reducing the number of gaps 20a with overflowing glue, and can also reduce the risk of forming a hard structure in the multiple gaps 20a due to the overflowing glue; the edge sealing and bending portions 221 of the multiple soft-pack battery cells 22 can also close all the gaps 20a, which can further reduce the number of gaps 20a with overflowing glue, and can even prevent all gaps 20a from overflowing glue, thereby further reducing the risk of forming a hard structure in the multiple gaps 20a due to the overflowing glue.

[0104] In the above technical solution, at least one soft-pack battery cell 22 is provided with an edge-sealing bent portion 221 on the first side 201, and the edge-sealing bent portion 221 is bent toward the gap 20a formed between any two adjacent soft-pack battery cells 22, and at least closes the corresponding gap 20a, so that the edge-sealing bent portion 221 can play a role in preventing glue overflow, and can reduce the risk of glue overflowing into the gap 20a between the soft-pack battery cells 22 during the assembly and gluing process of the battery device 100, and reduce the probability of forming a hard structure between the soft-pack battery cells 22 due to glue overflow, and can also reduce the risk of large local stress in the soft-pack battery cell 22, reduce the shell of the soft-pack battery cell 22 The occurrence of lithium deposition caused by damage can improve the reliability of the soft-pack battery cell 22, and further improve the reliability of the battery device 100.

[0105] In some embodiments of the present application, reference Figure 4 A plurality of soft-pack battery cells 22 are arranged side by side along a first direction X, the battery pack 20 has a second side 202 , the second side 202 is arranged at both ends of the first side 201 in the first direction X, and at least one edge sealing bending portion 221 is bent toward a direction close to the second side 202 .

[0106] It can be understood that, among the multiple soft-pack battery cells 22, there can be an edge-sealing bending portion 221 that is bent in the direction close to the second side 202, and the edge-sealing bending portion 221 can be located at the edge of the first direction X, or it can be located in the middle position, and the edge-sealing bending portion 221 can be bent in the direction of the adjacent second side 202, or a part of it can be bent in the direction of the adjacent second side 202 after bifurcation, and the other part extends to the second side 202 at the other end of the first direction X and is bent.

[0107] In the plurality of soft-pack battery cells 22 , there may also be two edge-sealing bent portions 221 , which are bent toward the adjacent second sides 202 , respectively. The two edge-sealing bent portions 221 may be located at the outermost edge in the first direction X or in the middle.

[0108] The bending angle of the edge-sealing bending portion 221 may be greater than or equal to 90 degrees, that is, the edge-sealing bending portion 221 may be bent to form an L-shape or a V-shape with an obtuse angle, and no specific limitation is made here.

[0109] In the above technical solution, the edge-sealing bent portion 221 can also prevent the glue from overflowing to the location of the second side 202 of the battery pack 20, reducing the risk of the second side 202 of the battery pack 20 overflowing and forming a hard structure, thereby reducing the probability of the second side 202 of the battery pack 20 causing large local stress and causing the soft-pack battery cell 22 to be damaged and lithium precipitated. In other words, by preventing the gap 20a at the location of the first side 201 and the second side 202 from overflowing, the reliability of the battery pack 20 can be further improved, thereby improving the reliability of the battery device 100.

[0110] In some embodiments of the present application, reference Figure 4 The portion of the edge-sealing bent portion 221 that is bent toward the second side 202 is a flange portion 2211 , and the flange portion 2211 and the second side 202 are in contact with each other.

[0111] It can be understood that the edge sealing bending portion 221 can be formed into an L-shaped structure after being bent in the direction close to the second side 202. This can make the flange portion 2211 fit tightly against the side surface of the outermost soft-pack battery cell 22 located on the second side 202, and the difficulty of glue entering between the flange portion 2211 and the side surface of the soft-pack battery cell 22 located on the second side 202 is further increased, which can further reduce the risk of glue overflow in the area where the second side 202 of the battery pack 20 is located.

[0112] In the above technical solution, the flange portion 2211 formed by bending the edge sealing bending portion 221 and the second side 202 are fitted together, which can reduce the risk of glue overflow on the side of the outermost soft-pack battery cell 22 located on the second side 202, and also reduce the probability of forming a hard structure. This can further reduce the risk of lithium plating caused by damage to the side of the outermost soft-pack battery cell 22 located on the second side 202, thereby further improving the reliability of the battery pack 20.

[0113] In some embodiments of the present application, reference Figure 4 The portion of the edge-sealing bent portion 221 that is bent toward the second side 202 is a flanging portion 2211 . The size of the orthographic projection of the flanging portion 2211 on the second side 202 in the second direction Z is less than or equal to 3 mm. The second direction Z is perpendicular to the first side 201 .

[0114] The dimension of the orthographic projection of the flange portion 2211 on the second side 202 in the second direction Z may be H, where H may be but is not limited to 3 mm, 2.8 mm, 2.5 mm, 2.3 mm, 2.0 mm, 1.8 mm, 1.6 mm, 1.4 mm, 1.2 mm, 1.0 mm, 0.8 mm, 0.6 mm, 0.4 mm, 0.2 mm, 0.1 mm, etc.

[0115] It is understandable that, since the amount of glue applied to the first side 201 of the battery pack 20 is not excessive, even if the glue overflows along the second direction Z, the overflow height is limited, usually not exceeding 3 mm. Therefore, if H is greater than 3 mm, the size of the flange portion 2211 in the second direction Z is relatively large, which easily causes the size of the edge-sealing bent portion 221 to be relatively large, increasing the material cost, and also increasing the weight of the soft-pack battery cell 22, thereby increasing the overall weight of the battery device 100, which is not conducive to improving the energy density of the battery device 100.

[0116] In the above technical solution, by setting the size of the projection of the flange portion 2211 on the second side 202 in the second direction Z within the above range, the size of the flange portion 2211 can be set within an appropriate range, so that the flange portion 2211 can reduce the amount of material and reduce the manufacturing cost while satisfying the requirement of having a good anti-glue overflow effect on the second side 202 of the battery pack 20, and is also beneficial to making the battery pack 20 lighter and improving the energy density of the battery device 100.

[0117] In some embodiments of the present application, a dimension of an orthographic projection of the flange portion 2211 on the second side 202 in the second direction Z is greater than or equal to 1 mm.

[0118] It is understandable that, when the first side 201 of the battery pack 20 is glued, part of the glue will overflow to the second side 202 of the battery pack 20 along the second direction Z, and the overflowed glue has a certain size in the second direction Z. The size H of the orthographic projection of the flange portion 2211 on the second side 202 in the second direction Z is 1 mm, which may refer to the minimum size value of the flange portion 2211 that can prevent the overflow of glue. If it is less than 1 mm, the risk of the glue passing over the flange portion 2211 and entering the second side 202 is relatively large, which will increase the risk of the second side 202 of the battery pack 20 forming a hard structure after the overflowed glue solidifies.

[0119] In the above technical solution, by setting the size of the orthographic projection of the flange portion 2211 on the second side 202 in the second direction Z within the above range, the size range of the flange portion 2211 can be further accurately controlled so that the size of the flange portion 2211 is neither too large nor too small, and the flange portion 2211 can have a better anti-glue overflow effect on the second side 202 of the battery pack 20.

[0120] In some embodiments of the present application, reference Figure 4 , each soft-pack battery cell 22 is provided with an edge-sealing bending portion 221 .

[0121] That is to say, among the multiple soft-pack battery cells 22 of the battery pack 20, each soft-pack battery cell 22 is provided with a sealing edge bending portion 221, and each sealing edge bending portion 221 can close the adjacent gap 20a, so that the sealing edge bending portions 221 of the multiple soft-pack battery cells 22 can work together to close all the gaps 20a.

[0122] In the above technical solution, each soft-pack battery cell 22 can be provided with an edge-sealing bent portion 221, and is used to close the gap 20a at the adjacent position. When all the gaps 20a of the battery pack 20 are closed, the size of the edge-sealing bent portion 221 can be reduced, thereby simplifying the structure of the edge-sealing bent portion 221 and reducing the manufacturing cost. Moreover, the structure of each soft-pack battery cell 22 can be kept consistent, and the assembly order of multiple soft-pack battery cells 22 does not need to be considered, which is conducive to reducing the difficulty of assembly and improving assembly efficiency.

[0123] In some embodiments of the present application, reference Figure 4 , a plurality of soft-pack battery cells 22 are arranged side by side along the first direction X, and the edge-sealing bending portion 221 is connected to the middle position of the soft-pack battery cell 22 in the first direction X.

[0124] In the above technical solution, the setting position of the edge sealing bending portion 221 of each soft-pack battery cell 22 can be kept consistent, so that the fixing effect of the edge sealing bending portion 221 on the soft-pack battery cell 22 and the sealing effect on the gap 20a are relatively evenly distributed in the first direction X, which can reduce the risk of uneven force on the soft-pack battery cell 22 and local looseness due to unreasonable connection position, which is beneficial to maintaining the neatness of the arrangement of the soft-pack battery cells 22 of the battery pack 20 in the first direction X and the stability of the overall structure, thereby improving the reliability of the battery device 100.

[0125] In some embodiments of the present application, reference Figure 4 In the first direction X, the size of the soft-pack battery cell 22 is L1, and the size of the edge-sealing bent portion 221 is L2, wherein 0.5<L2 / L1≤1.

[0126] L2 / L1 can be, but is not limited to, 0.52, 0.54, 0.55, 0.57, 0.6, 0.62, 0.65, 0.67, 0.7, 0.72, 0.75, 0.77, 0.8, 0.82, 0.85, 0.87, 0.9, 0.92, 0.95, 0.97, 1.0, and the like.

[0127] If L2 / L1 is greater than 0.5, the size of the edge-sealing bend 221 in the first direction X is the smallest that can close the gap 20a, and can also provide a glue-overflow prevention effect for the gap 20a. If L2 / L1 is equal to 1, the edge-sealing bend 221 has a larger size in the first direction X, which can increase the difficulty of the glue entering the gap 20a along the gap between the edge-sealing bend 221 and the soft-pack battery cell 22, further reducing the risk of glue entering the gap 20a, and the edge-sealing bends 221 of two adjacent soft-pack battery cells 22 can just stop each other, which can provide better support for the soft-pack battery cell 22, reduce the risk of stress concentration due to lack of support at a local position on the surface of the soft-pack battery cell 22, and can also improve the reliability of the soft-pack battery cell 22.

[0128] In the above technical solution, by setting the size ratio of the edge sealing bent portion 221 and the soft-pack battery cell 22 in the first direction X within the above range, the edge sealing bent portion 221 can have a good anti-overflow glue effect on the gap 20a while providing better support for the soft-pack battery cell 22, thereby reducing the risk of local stress concentration on the surface of the soft-pack battery cell 22 located on the first side 201, thereby further improving the reliability of the soft-pack battery cell 22, and further improving the reliability of the battery device 100.

[0129] In some embodiments of the present application, 0.75≤L2 / L1≤1.

[0130] L2 / L1 can be, but is not limited to, 0.75, 0.78, 0.80, 0.85, 0.88, 0.90, 0.95, 0.98, 1.0, etc. It is understandable that when L2 / L1 is 0.75, the edge-sealing bent portion 221 exceeds the gap 20a by a large amount in the first direction X, so that the edge-sealing bent portion 221 has a sufficient length to prevent the glue from overflowing into the gap 20a along the first direction X, which is beneficial to further reduce the risk of the glue overflowing into the gap 20a.

[0131] In the above technical solution, by further accurately controlling the range of L2 / L1, the sealing effect of the edge sealing bending portion 221 on the gap 20a can be further improved, and the risk of glue overflowing into the gap 20a can be reduced, which can further improve the reliability of the battery pack 20 and further improve the reliability of the battery device 100.

[0132] In some embodiments of the present application, reference Figure 6 The orthographic projections of any two adjacent edge-sealing bent portions 221 on the first side 201 at least partially overlap.

[0133] In the above technical solution, the above solution can enable the two adjacent edge-sealing bent portions 221 to have a better covering effect on the surface of the soft-pack battery cell 22 located on the first side 201, which can further reduce the risk of glue overflowing into the gap 20a, and can also reduce the contact between the glue and the surface of the soft-pack battery cell 22 located on the first side 201. When the soft-pack battery cell 22 is removed from the box body 10 at a later stage, the edge-sealing bent portion 221 can be directly cut off without damaging the soft-pack battery cell 22, which is conducive to the removal of the soft-pack battery cell 22.

[0134] In some embodiments of the present application, reference Figures 4 to 6 , a plurality of soft-pack battery cells 22 are arranged side by side along the first direction X, and the battery pack 20 has a second side 202, and the second side 202 is arranged at both ends of the first side 201 located in the first direction X; wherein, of the two of the plurality of soft-pack battery cells 22 located at both ends of the first direction X, the edge-sealing bending portion 221 of one is bent in a direction close to the second side 202, and the other is provided with two edge-sealing bending portions 221, and the one of the two edge-sealing bending portions 221 that is away from the corresponding gap 20a is bent in a direction close to the other second side 202.

[0135] In the battery pack 20 composed of multiple soft-pack battery cells 22, for ease of understanding, one of the second sides 202 at both ends of the first direction X can be understood as being located at the starting side of the arrangement direction of the multiple soft-pack battery cells 22, and the other is located at the end side. The edge sealing bending portion 221 of each soft-pack battery cell 22 can be bent toward the end side and close the adjacent gap 20a, wherein the edge sealing bending portion 221 of the soft-pack battery cell 22 at the end can be bent toward the second side 202 of the end side to prevent glue from overflowing to the second side 202 of the end side, and for the second side 202 of the starting side, the soft-pack battery cell 22 at the head end can be provided with an additional edge sealing bending portion 221, so that it is bent toward the second side 202 of the starting side to prevent glue from overflowing to the second side 202 of the starting side.

[0136] In the above technical solution, the above solution can prevent the gap 20a of the battery pack 20 located on the first side 201 and the second side 202 located at both ends of the first direction X from overflowing glue, reduce the risk of overflowing glue forming a hard structure in the gap 20a and the second side 202, and reduce the probability of local stress concentration causing damage to the soft-pack battery cell 22 and causing lithium precipitation, thereby playing a more comprehensive protective role and being conducive to improving the reliability of the battery device 100. Moreover, the use of this structure can reduce the number of parts while satisfying the requirement of having a good anti-overflow glue effect on the second side 202. Multiple soft-pack battery cells 22 can reduce assembly steps during the assembly stage, and the assembly is simple, which can improve assembly efficiency.

[0137] In some embodiments of the present application, reference Figure 7 , a plurality of soft-pack battery cells 22 are arranged side by side along a first direction X, and the battery pack 20 has a second side 202, and the second side 202 is arranged at both ends of the first side 201 located in the first direction X; wherein, of the two ends of the plurality of soft-pack battery cells 22 located in the first direction X, the edge sealing bending portion 221 of one is bent in a direction close to the second side 202, and a blocking member 30 is provided at the position of the other, and the blocking member 30 is arranged on the first side 201 and is bent in a direction close to the second side 202.

[0138] Referring to the foregoing, a separate blocking member 30 can be provided at the location of the soft-pack battery cell 22 at the first end of the second side 202 of the starting side. The blocking member 30 can be V-shaped or L-shaped, and partially bent toward the second side 202 of the starting side to prevent the glue from overflowing toward the second side 202 of the starting side. The material of the blocking member 30 and the material of the edge-sealing bending portion 221 can be the same or different. For example, the blocking member 30 and the edge-sealing bending portion 221 can both be aluminum-plastic films. The blocking member 30 can also be made of a different material from the edge-sealing bending portion 221, and the blocking member 30 can be made of an insulating material.

[0139] In the above technical solution, by setting a separate blocking member 30, the structures of each soft-pack battery cell 22 can be kept consistent while satisfying the gap 20a on the first side 201 of the battery pack 20 and the second sides 202 at both ends of the first direction X to prevent glue from overflowing. There is no need to consider the assembly sequence during the assembly stage, which facilitates assembly and is also conducive to simplifying the structure of the soft-pack battery cell 22, which can improve manufacturability and reduce manufacturing costs.

[0140] In some embodiments of the present application, reference Figure 5 A plurality of soft-pack battery cells 22 are arranged side by side along the first direction X, and one of the plurality of soft-pack battery cells 22 located at one end of the first direction X is provided with a sealing edge bending portion 221, which extends along the first direction X and closes all gaps 20a.

[0141] In the above technical solution, only one of the multiple soft-pack battery cells 22 may be provided with a sealing edge bending portion 221, and all the gaps 20a can be closed by the sealing edge bending portion 221, thereby satisfying the function of preventing glue from overflowing the gaps 20a on the first side 201 of the battery pack 20 while simplifying the structure of other soft-pack battery cells 22, which is beneficial to reducing the manufacturing complexity of most soft-pack battery cells 22, and further reducing the manufacturing cost, thereby reducing the overall manufacturing cost of the battery pack 20.

[0142] In some embodiments of the present application, reference Figure 3 , Figure 8 and Fig. 9, a plurality of soft-pack battery cells 22 are arranged side by side along the first direction X, the size of the soft-pack battery cells 22 in the third direction Y is greater than the size in the first direction X, and the third direction Y is perpendicular to the first direction X and parallel to the first side 201 .

[0143] In the above technical solution, the shape of the soft-pack battery cell 22 can be an elongated strip, and the soft-pack battery cell 22 of this shape is convenient for being assembled into a battery pack 20 with a larger capacity, thereby increasing the battery capacity of the battery device 100. The elongated soft-pack battery cell 22 also has a larger surface area to volume ratio, and has more surface area for heat exchange, so that the heat can be dissipated faster, which is conducive to maintaining the stability of battery performance, thereby improving the reliability of the battery device 100.

[0144] In some embodiments of the present application, reference Figures 3 to 9 The plurality of soft-pack battery cells 22 are arranged side by side along the first direction X. The battery pack 20 includes a housing 23 having an opening 23 a opened toward the first side 201 . At least a portion of the plurality of soft-pack battery cells 22 are received in the housing 23 .

[0145] 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.

[0146] 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 bonding with the first side 201 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 connecting 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.

[0147] 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.

[0148] In some embodiments of the present application, the housing 23 is a metal member or a non-metal member.

[0149] 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.

[0150] 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.

[0151] In some embodiments of the present application, the housing 23 is made of stainless steel or aluminum.

[0152] 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.

[0153] In some embodiments of the present application, reference Figure 4 and Fig. 9 A pressure relief portion 24 is provided on the shell wall of the shell 23 away from the opening 23a.

[0154] 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.

[0155] 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 larger volume and causes the shell to rupture, and the gas will be exhausted to release pressure. 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.

[0156] 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 of the outer shell 23 away from the opening 23a, the pressure relief portion 24 can guide the gas discharged from the soft-pack battery cell 22 for directional pressure relief, which is beneficial to the thermal runaway management of the battery device 100.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] In some embodiments of the present application, reference Fig. 9 The housing 23 includes a first shell wall 231 , a second shell wall 232 and a third shell wall 233 . The second shell wall 232 and the third shell wall 233 are connected to two ends of the first shell wall 231 in the first direction X. An opening 23 a is formed between the second shell wall 232 and the third shell wall 233 .

[0163] By configuring the outer shell 23 to include a first shell wall 231, a second shell wall 232, and a third shell wall 233, the outer 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 inserted or removed from the opening 23a. During the assembly process of the battery device 100, the staff can slide the soft-pack battery cell 22 into the opening 23a 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 outer shell 23. For example, on the production line of the battery device 100, this structure of the outer shell 23 can improve installation efficiency and reduce assembly costs.

[0164] 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.

[0165] 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.

[0166] 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 side 201 and the edge-sealing bent portion 221 are bonded to the box walls 111 .

[0167] 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 surface of the soft-pack battery cell 22 located on the first side 201 may be fixed to one of the bottom box wall, the top box wall, and the side box wall by glue.

[0168] In the above technical solution, the surface of the soft-pack battery cell 22 located on the first side 201 can be fixed to the box wall 111 of the box body 10 by glue, so that the connection between the soft-pack battery cell 22 and the box body 10 is more secure.

[0169] In some embodiments of the present application, reference Fig.10 The box body 10 includes a box body main body 101 and a heat exchange plate 102 . The heat exchange plate 102 is connected to the box body main body 101 and defines a receiving space 10a together with the box body main body 101 . The first side 201 and the edge sealing bent portion 221 are bonded to the heat exchange plate 102 .

[0170] 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, wherein the cold plate may be but is not limited to a water-cooled 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. Among them, the glue coated between the surface of the battery pack 20 located on the first side 201 and the heat exchange plate 102 may form a glue layer 40 (see Fig.10 ).

[0171] In the above technical solution, by gluing and fixing the surface of the soft-pack battery cell 22 located on the first side 201 to the heat exchange plate 102, 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.

[0172] In some embodiments of the present application, reference Fig.10 The heat exchange plate 102 is arranged at the bottom of the box body 101.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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).

[0178] 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.

[0179] 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.

[0180] 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.).

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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 0.2O2 (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 0.15 Al 0.05 O2) and its modified compounds, etc.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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%.

[0193] 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%.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.).

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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%.

[0203] 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%.

[0204] 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%.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] The porous base membrane may include one or more of polyethylene and polypropylene.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] In some embodiments, the pouch cell 22 further includes an electrolyte.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.).

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] In some embodiments of the present application, reference Figure 4 and Fig. 9 The soft-pack battery cell 22 is a ternary battery cell. The battery pack 20 includes a shell 23 having an opening 23a opened toward the first side 201. Multiple soft-pack battery cells 22 are accommodated in the shell 23. The shell wall of the shell 23 away from the opening 23a is provided with a pressure relief portion 24.

[0225] 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.

[0226] 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.

[0227] The embodiment of the present application provides an electric device 1000 , comprising a battery device 100 as described in any one of the above.

[0228] 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.

[0229] The embodiment of the present application also provides a specific embodiment of a battery device 100 .

[0230] Reference Figure 3 and Figure 7 The battery device 100 includes a housing 10 and a battery pack 20 .

[0231] The box body 10 has a storage space 10a. The battery pack 20 is arranged in the storage space 10a, and the first side 201 of the battery pack 20 is bonded to the box body 10. The battery pack 20 includes a shell 23 and a plurality of soft-pack battery cells 22. The shell 23 can be a U-shaped soft shell. The plurality of soft-pack battery cells 22 can be arranged side by side and stored in the shell 23. A gap 20a is formed between any adjacent soft-pack battery cells 22. Each soft-pack battery cell 22 forms a folded edge when the soft shell on the first side 201 is packaged. The folded edge can form a sealing edge bending portion 221. The sealing edge bending portion 221 is bent toward any adjacent gap 20a and closes the adjacent gap 20a. Therefore, the sealing edge bending portions 221 of the plurality of soft-pack battery cells 22 can jointly close all the gaps 20a of the battery pack 20.

[0232] The soft-pack battery cells 22 are arranged side by side along the first direction X. In the first direction X, the edge-sealing bent portion 221 is located in the middle of the corresponding soft-pack battery cell 22, and the size of the edge-sealing bent portion 221 in the first direction X is equal to the size of the soft-pack battery cell 22 in the first direction X. The edge-sealing bent portion 221 of the soft-pack battery cell 22 located at one end of the first direction X is bent toward the second side 202 of the battery pack 20 in an L shape to prevent glue from overflowing to the second side 202 of the battery pack 20. The soft-pack battery cell 22 located at the other end of the first direction X is provided with a blocking member 30 on the first side 201, and the blocking member 30 is bent toward the adjacent second side 202 in an L shape to prevent glue from overflowing to the adjacent second side 202.

[0233] 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 disposed in the accommodation space, and a first side of the battery pack is bonded to the box body, the battery pack includes a plurality of soft-pack battery cells arranged side by side, and gaps are formed between adjacent soft-pack battery cells; At least one of the soft-pack battery cells is provided with an edge-sealing bending portion on the first side, and the edge-sealing bending portion is bent toward any adjacent gap and at least closes the corresponding gap.

2. The battery device according to claim 1, characterized in that: A plurality of the soft-pack battery cells are arranged side by side along a first direction, the battery pack has a second side, the second side is arranged at two ends of the first side in the first direction, and at least one of the edge sealing bent portions is bent toward the second side.

3. The battery device according to claim 2, characterized in that: The portion of the edge-sealing bent portion that is bent toward the second side is a flange portion, and the flange portion is in contact with the second side.

4. The battery device according to claim 2 or 3, characterized in that: The portion of the edge-sealing bent portion that is bent toward the second side is a flanging portion, and a dimension of a positive projection of the flanging portion on the second side in a second direction is less than or equal to 3 mm, and the second direction is perpendicular to the first side.

5. The battery device according to claim 1, characterized in that: The soft-pack battery cells are all provided with the edge-sealing bending portion.

6. The battery device according to claim 5, characterized in that: A plurality of the soft-pack battery cells are arranged side by side along a first direction, and the edge-sealing bent portion is connected to a middle position of the soft-pack battery cell in the first direction.

7. The battery device according to claim 6, characterized in that: In the first direction, the size of the soft-pack battery cell is L1, and the size of the edge-sealing bent portion is L2, wherein 0.5<L2 / L1≤1.

8. The battery device according to claim 7, characterized in that: 0.75≤L2 / L1≤1.

9. The battery device according to claim 6, characterized in that: Orthographic projections of any two adjacent edge-sealing bent portions on the first side at least partially overlap.

10. The battery device according to any one of claims 6 to 9, characterized in that: A plurality of the soft-pack battery cells are arranged side by side along a first direction, and the battery pack has a second side, and the second side is arranged at two ends of the first side located in the first direction; wherein, of the two of the two ends of the soft-pack battery cells located in the first direction, the edge sealing bending portion of one is bent in a direction close to the second side, and the other is provided with two edge sealing bending portions, and the one of the two edge sealing bending portions away from the corresponding gap is bent in a direction close to the other second side.

11. The battery device according to any one of claims 6 to 9, characterized in that: A plurality of the soft-pack battery cells are arranged side by side along a first direction, and the battery pack has a second side, and the second side is arranged at both ends of the first side in the first direction; wherein, of the two of the plurality of the soft-pack battery cells located at both ends of the first direction, the edge sealing bending portion of one is bent in a direction close to the second side, and a blocking member is provided at the position of the other, and the blocking member is arranged on the first side and bent in a direction close to the second side.

12. The battery device according to any one of claims 1 to 3, characterized in that: The plurality of soft-pack battery cells are arranged side by side along a first direction, and one of the plurality of soft-pack battery cells located at one end of the first direction is provided with the edge-sealing bending portion, which extends along the first direction and closes all the gaps.

13. The battery device according to any one of claims 1 to 3 and 5 to 9, characterized in that: A plurality of the soft-pack battery cells are arranged side by side along a first direction, a size of the soft-pack battery cell in a third direction is larger than a size in the first direction, and the third direction is perpendicular to the first direction and parallel to the first side.

14. The battery device according to claim 13, characterized in that: The plurality of soft-pack battery cells are arranged side by side along a first direction, the battery pack comprises a housing having an opening opened toward the first side, and at least a portion of the plurality of soft-pack battery cells are accommodated in the housing.

15. The battery device according to claim 14, characterized in that: The shell is made of metal or non-metal.

16. The battery device according to claim 15, characterized in that: The shell is made of stainless steel or aluminum.

17. The battery device according to claim 14, characterized in that: A pressure relief portion is provided on a shell wall of the shell away from the opening.

18. The battery device according to claim 17, 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.

19. The battery device according to claim 14, 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 opening is formed between the second shell wall and the third shell wall.

20. The battery device according to any one of claims 1 to 3 and 5 to 9, characterized in that: The box body includes a plurality of box walls, which together define the accommodating space, and the first side and the edge-sealing bent portion are bonded to the box walls.

21. The battery device according to any one of claims 1 to 3 and 5 to 9, characterized in that: The box body includes a box body main body and a heat exchange plate. The heat exchange plate is connected to the box body main body and defines the accommodating space together with the box body main body. The first side and the edge sealing bent portion are bonded to the heat exchange plate.

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 3 and 5 to 9, 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 an opening opening toward the first side. A plurality of the soft-pack battery cells are accommodated in the shell. A shell wall of the shell away from the opening is provided with a pressure relief portion.

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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