Battery device and electric device

Abstract

The battery device comprises a box body, a battery monomer assembly comprises a shell assembly and a battery cell group, the shell assembly comprises a first shell and a second shell, the first shell is provided with a first opening and a second opening which face different directions, the second shell is arranged at the first opening, and the battery cell group is arranged in the second shell; the shell assembly is arranged in the first shell and forms a containing cavity together with the first shell, the battery cell group is arranged in the containing cavity, the battery cell group is provided with two first surfaces opposite to each other in the thickness direction of the soft package battery single body, the two first surfaces are connected with the shell assembly, one of the two first surfaces directly faces the first opening, and the side, close to the second opening, of the soft package battery single body is bonded to the box body. According to the technical scheme, the battery cell group is assembled in the shell through the open structure, so that the assembly precision of the soft package battery monomers can be improved, and meanwhile, the grouping efficiency of the soft package battery monomers 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, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The reliability of power batteries has a significant impact on the vehicle's endurance and power performance. Therefore, improving battery reliability is a key research direction for continuous improvement and innovation of batteries. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery device and an electric device, which can effectively improve the reliability of the soft-pack battery monomer assembly inside the battery device, thereby improving the reliability of the battery device.

[0004] In the first aspect, an embodiment of the present application provides a battery device, comprising: a case having a bottom plate for supporting a battery cell assembly; the battery cell assembly comprises a shell assembly and a cell group, the shell assembly comprises a first shell and a second shell, the first shell has a first opening and a second opening facing different directions, the second shell is arranged at the first opening, and together with the first shell forms a accommodating cavity; the cell group is arranged in the accommodating cavity, the cell group comprises at least one soft-pack battery cell, at least one surface of the soft-pack battery cell is bonded to the case through the second opening; the cell group has two first surfaces opposite to each other along the thickness direction of the soft-pack battery cell, the two first surfaces are both connected to the shell assembly, and one of the two first surfaces is opposite to the first opening.

[0005] In the above technical solution, since the shell assembly is divided into a first shell and a second shell, and the first shell has a first opening and a second opening facing in different directions, when the battery cell group is assembled into the shell, the battery cell group enters the shell through the first opening along the thickness direction of the soft-pack battery cell. Compared with the solution in which the battery cell group enters the shell and the shell is easily deformed when the first shell and the second shell are integrally arranged, since the first shell and the second shell are detachably matched, the battery cell group is not easily deformed during the entry process. Therefore, this structure is more stable and can improve the reliability of the battery device. In addition, since the first opening is directly opposite to the first surface of the battery cell group along the thickness direction, the first opening is opposite to the larger surface of the battery cell group, which can reduce the obstruction of the larger surface of the battery cell group in the process of entering the shell, further improving the reliability of the battery device.

[0006] In some embodiments, the battery cell group has two second surfaces opposite to each other along the width direction of the soft-pack battery cell, the two second surfaces are spaced between the two first surfaces, the first shell includes a first fixing portion and a second fixing portion, the first fixing portion covers at least a portion of one of the first surfaces along the thickness direction of the soft-pack battery cell, the second fixing portion is connected to a side of the first fixing portion along the thickness direction of the soft-pack battery cell, and covers at least a portion of the second surface of the battery cell group along the width direction of the soft-pack battery cell, and the second shell includes a third fixing portion, the third fixing portion is arranged on a side of the second fixing portion away from the first fixing portion, and covers at least a portion of the other first surface along the thickness direction of the soft-pack battery cell.

[0007] In the above technical solution, the first fixing portion of the first shell covers at least a portion of a first surface of the battery cell group, the second fixing portion covers at least a portion of the second surface, and the third fixing portion of the second shell covers at least a portion of another first surface. Through the detachable cooperation of the first shell and the second shell, the shell is not easy to be deformed when the battery cell group is put into the shell, and the shell is not easy to be stretched open, thereby improving the assembly accuracy and assembly efficiency. At the same time, the first fixing portion, the second fixing portion and the third fixing portion can provide support and protection for the battery cell group from the thickness direction and the width direction of the soft-pack battery cell, thereby improving the overall strength of the battery cell group.

[0008] In some embodiments, the second shell further includes a fourth fixing portion, which is connected to one side of the third fixing portion along the width direction of the soft-pack battery cell and is docked with the second fixing portion and jointly covers the second surface of the battery cell group.

[0009] In the above technical solution, the fourth fixing portion of the second shell is docked with the second fixing portion to jointly cover the second surface of the battery cell group, which can strengthen the constraint of the battery cell group along the width direction of the soft-pack battery cell and improve the ability of the soft-pack battery cell to resist vibration and impact.

[0010] In some embodiments, the docking position of the second fixing portion and the fourth fixing portion is located at the midpoint of a line connecting the two first surfaces.

[0011] In the above technical solution, the docking position of the second fixing part and the fourth fixing part is located at the midpoint of the line connecting the two first surfaces, which can ensure that the second fixing part and the fourth fixing part completely cover the second surface, further improving the vibration and impact resistance of the battery pack along the width direction of the soft-pack battery cell.

[0012] In some embodiments, the first shell also includes a fifth fixing portion, which is connected to a side of the second fixing portion away from the first fixing portion, and is docked with the third fixing portion along the width direction of the soft-pack battery cell, and together with the third fixing portion along the thickness direction of the soft-pack battery cell covers another first surface.

[0013] In the above technical solution, the first fixing portion covers at least a portion of a first surface of the battery cell group, the fifth fixing portion covers a portion of another first surface of the battery cell group, the second fixing portion covers the second surface, and the first fixing portion and the fifth fixing portion are connected into a whole, which can strengthen the fixing effect on the entire battery cell group. At the same time, the fifth fixing portion has a pre-positioning effect on the entire battery cell group after it is put into the shell, which can reduce the position of the battery cell group. The displacement occurs along the thickness direction of the soft-pack battery cell. The third fixing portion and the fifth fixing portion are butt-jointed along the width direction of the soft-pack battery cell to ensure that there is enough coverage area for the other first surface of the battery cell group, which is beneficial to the fixation of the battery cell group, improves the vibration and impact resistance of the battery cell group, and improves the reliability of the soft-pack battery cell.

[0014] In some embodiments, the docking position of the third fixing portion and the fifth fixing portion is located in the middle of the width of the soft-pack battery cell.

[0015] In the above technical solution, the docking position of the third fixing part and the fifth fixing part is located in the middle of the width of the soft-pack battery cell, which can reduce the difficulty of shell processing and simplify the processing technology. The two together cover the first surface of the battery cell group, which can increase the restraint force on the battery cell group along the thickness direction of the soft-pack battery cell. At the same time, it can also avoid the exposure of the first surface of the battery cell group, and reduce the risk of damage to the soft-pack battery cell due to the entry of external foreign matter.

[0016] In some embodiments, the soft-pack battery cell includes a shell and an electrode assembly, the shell wraps the electrode assembly, and the electrode assembly is formed by winding or stacking pole sheets.

[0017] In the above technical solution, the electrode assembly can be formed by winding or stacking the electrode sheets, and the outer shell wraps the electrode assembly, so that the soft-pack battery cells can be flexibly set to different types of soft-pack battery cells according to the usage scenarios.

[0018] In some embodiments, the battery cell assembly includes a plurality of shell assemblies, and the plurality of shell assemblies are arranged in sequence along the thickness direction of the soft-pack battery cell, and a battery cell group is disposed in the accommodating cavity of each shell assembly.

[0019] In the above technical solution, the battery cell assembly includes multiple shell assemblies, and a cell group is arranged in the accommodating cavity of each shell assembly, which can further improve the grouping efficiency of the battery cell assembly. At the same time, adjacent cell groups are respectively accommodated in the accommodating cavities of different shell assemblies. When thermal runaway occurs in one of the cell groups, the shell assembly can prevent the thermal runaway from spreading to the adjacent cell group, thereby reducing the risk of thermal diffusion in the battery cell assembly.

[0020] In some embodiments, at least partially two adjacent housing components share a portion of the housing.

[0021] In the above technical solution, at least two adjacent shell components share part of the shell, which can save materials and reduce production costs. At the same time, the shared shell can reduce the space occupied by the shell component in the battery box, increase the battery energy density, and help improve the assembly efficiency of the battery monomer component.

[0022] In some embodiments, the soft-pack battery cell includes two oppositely disposed third surfaces and two oppositely disposed fourth surfaces, the surface area of ​​the third surface is larger than that of the fourth surface, the third surfaces of the soft-pack battery cells on both sides of the same accommodating cavity form the first surface of the battery cell group, and the fourth surfaces of all the soft-pack battery cells in the same accommodating cavity jointly form the second surface of the battery cell group, and any two adjacent shell assemblies, one of which has a first shell covering a portion of the first surface of the corresponding battery cell group along the thickness direction of the soft-pack battery cell, and the other has a second shell covering a portion of the first surface of the corresponding battery cell group along the thickness direction of the soft-pack battery cell.

[0023] In the above technical solution, any two adjacent shell assemblies, one of which has a first shell covering a portion of the first surface of the battery cell group corresponding to its accommodating cavity, and the other of which has a second shell covering a portion of the first surface of the battery cell group corresponding to its accommodating cavity, share a shell, which can reduce the space occupied by the shell assembly, improve the grouping efficiency, and improve the assembly accuracy of the battery cell group.

[0024] In some embodiments, the third surface and the fourth surface of any soft-pack battery cell are connected by a transition portion.

[0025] In the above technical solution, the third surface and the fourth surface of any soft-pack battery cell are connected via a transition portion, which can increase the connection strength and reduce the risk of cracking of the soft-pack battery cell shell.

[0026] In some embodiments, the transition portion is an R angle.

[0027] In the above technical solution, the transition portion is an R angle, which is conducive to the processing and manufacturing of the soft-pack battery monomer shell, improves the shell's ability to resist cracking, and can improve the production efficiency of the soft-pack battery monomer.

[0028] In some embodiments, a glue blocking structure is provided between R corners of any two adjacent soft-pack battery cells in the same accommodating cavity, and the glue blocking structure is provided at the bottom of the box body.

[0029] In the above technical solution, a glue blocking structure is arranged between the R corners of any two adjacent soft-pack battery cells in the same accommodating cavity, which can prevent glue from overflowing to the R corner when the soft-pack battery cell is bonded to the box body, thereby reducing the risk of stress concentration at the R corner of the soft-pack battery cell.

[0030] In some embodiments, the glue blocking structure is a glue blocking strip.

[0031] In the above technical solution, the glue blocking structure is a glue blocking strip, which can be directly bonded to the bottom of the box body, has a simple structure, is easy to install, and has high reliability.

[0032] In some embodiments, the battery device further includes an adhesive, the battery cell group includes a plurality of soft-pack battery cells, and the third surfaces of the plurality of soft-pack battery cells and the third surface and the shell assembly are connected to each other through the adhesive.

[0033] In the above technical solution, the battery device includes an adhesive, the battery cell group includes a plurality of soft-pack battery cells, and the third surfaces of the plurality of soft-pack battery cells, as well as the third surfaces and the shell assembly are connected to each other through the adhesive, so that the plurality of soft-pack battery cells and the shell assembly can be connected into a whole, thereby improving the ability of a single soft-pack battery cell to resist vibration and impact, and reducing the risk of deformation and damage of the soft-pack battery cell.

[0034] In some embodiments, the first opening is disposed on one side of the soft-pack battery cell in a thickness direction, and the second opening is disposed on one side of the soft-pack battery cell in a width direction.

[0035] In the above technical solution, the first shell includes a first opening along the thickness direction of the soft-pack battery cell and a second opening in the width direction. The soft-pack battery cell can be assembled into the shell through the first opening without deforming the shell, which is beneficial to improving assembly efficiency. After the shell is inserted, it can be bonded to the box through the second opening, which is beneficial to improving the position stability of the battery cell group.

[0036] In some embodiments, along the thickness direction of the soft-pack battery cell, the second openings of any two adjacent shell components face opposite directions.

[0037] In the above technical solution, along the thickness direction of the soft-pack battery cell, the second openings of any two adjacent shell components are in opposite directions. When a soft-pack battery cell accommodated in one of the shell components undergoes thermal runaway, since the second openings of the shell components are in opposite directions, the thermal runaway can be prevented from spreading to the battery cell group accommodated in the adjacent shell component, thereby reducing the risk of heat spread.

[0038] In some embodiments, the material of the housing component is metal or plastic.

[0039] In the above technical solution, the material of the shell assembly is metal or plastic, and its hardness is higher than that of the outer shell of the soft-pack battery cell. When subjected to external vibration and impact, the shell assembly can provide support and protection for the soft-pack battery cell, reducing the risk of deformation and damage of the soft-pack battery cell.

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

[0041] In the above technical solution, the soft-pack battery cell is set to be any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell can be flexibly set to different types of battery cells according to the needs of the usage scenario.

[0042] In some embodiments, the second opening is communicated with the accommodating cavity, a reinforcing portion is provided at a position of the shell component close to the second opening, and the shell component is connected to the bottom plate through the reinforcing portion.

[0043] In the above technical solution, the first shell includes a second opening, the second opening is connected to the accommodating cavity, and a reinforcing portion is provided at a position of the shell assembly near the second opening. The shell assembly is connected to the bottom plate through the reinforcing portion, so that the shell assembly and the box body of the battery device can be connected into a whole, which can further improve the ability of the soft-pack battery cell to resist vibration and impact, and reduce the risk of deformation and displacement of the soft-pack battery cell. At the same time, the reinforcing portion can increase the strength of the shell assembly, making the shell assembly less likely to deform, thereby providing better protection for the battery cell group.

[0044] In some embodiments, a slot is provided on the bottom plate, and the reinforcing portion is inserted into the slot.

[0045] In the above technical solution, a slot is provided on the bottom plate, and the reinforcement part is inserted into the slot, which can improve the connection strength between the shell assembly and the bottom plate of the box body, and is not easy to separate from the box body when subjected to vibration impact. The impact force can be dispersed to the entire box body, so that the force is evenly applied to the shell assembly and it is not easy to deform. At the same time, the reinforcement part is inserted into the slot, which can reduce the size of the shell assembly along the width direction of the soft-pack battery cell, which is beneficial to saving box space and improving space utilization.

[0046] In some embodiments, the battery device further includes a thermally conductive structural adhesive, and a side of the soft-pack battery cell close to the second opening is bonded to the bottom plate by the thermally conductive structural adhesive.

[0047] In the above technical solution, the battery device includes a thermally conductive structural adhesive, and the side of the soft-pack battery cell close to the second opening is bonded to the bottom plate by the thermally conductive structural adhesive. On the basis that the reinforcement portion of the shell assembly is fixed to the bottom plate through the slot, the soft-pack battery cell and the bottom plate are bonded by the thermally conductive structural adhesive, which can further improve the connection strength between the battery cell assembly and the box body and reduce the risk of displacement and deformation of the soft-pack battery cell. At the same time, the thermally conductive structural adhesive can conduct the heat generated by the soft-pack battery cell to the bottom plate of the box body, which is beneficial to reduce the temperature of the soft-pack battery cell and reduce the risk of thermal runaway.

[0048] In some embodiments, the bottom plate is a heat exchange plate, and the soft-pack battery cells are bonded to the heat exchange plate by a heat-conductive structural adhesive.

[0049] In the above technical solution, the bottom plate of the box is a heat exchange plate, and the soft-pack battery monomer is bonded to the heat exchange plate by a thermally conductive structural adhesive. A heat exchange medium flows in the heat exchange plate. The soft-pack battery monomer is bonded to the heat exchange plate by the thermally conductive structural adhesive, which can improve the heat exchange efficiency and further reduce the risk of thermal runaway of the soft-pack battery monomer. At the same time, the bottom plate integrates the heat exchange plate function to improve the space utilization of the box.

[0050] In some embodiments, the reinforcement portion is formed by bending a shell of the shell assembly.

[0051] In the above technical solution, the reinforcement part is formed by bending the shell of the shell assembly, and the reinforcement part and the shell assembly are integrally formed, which is conducive to simplifying the processing technology, improving the production cycle, and does not introduce new components, which is conducive to reducing production costs.

[0052] In some embodiments, the reinforcement portion is wavy in shape.

[0053] In the above technical solution, the reinforcing portion is configured in a wave shape, which can further improve the shell strength of the shell assembly. The fixing portion is not easily deformed, and can provide stable support and protection for the battery cell group, reducing the risk of deformation and displacement of the soft-pack battery cell.

[0054] In some embodiments, the reinforcement is formed by a local thickening of the shell of the shell assembly.

[0055] In the above technical solution, the reinforcement part is formed by locally thickening the shell of the shell assembly, which can reduce the difficulty of processing the reinforcement part, facilitate production and manufacturing, and improve production efficiency.

[0056] In some embodiments, the battery device further includes an expansion beam, the expansion beam is connected to the bottom plate, and the shell assembly abuts against the expansion beam along the thickness direction of the soft-pack battery cell.

[0057] In the above technical solution, the battery device also includes an expansion beam, which is connected to the bottom plate. The shell assembly abuts against the expansion beam along the thickness direction of the soft-pack battery cell, which can reduce the number of components inside the box and improve the utilization rate of the internal space of the box. More battery cell assemblies can be accommodated, which is beneficial to improving the capacity of the battery device. The expansion beam abuts against the shell assembly along the thickness direction of the soft-pack battery cell, which can absorb the expansion force of the soft-pack battery cell and reduce the risk of deformation and damage of the shell assembly.

[0058] In the second aspect, please provide an electrical device, including the battery device according to the first aspect of the present application.

[0059] In the above-mentioned embodiment, by setting the battery device of the first aspect, the battery cell assembly includes a shell assembly and a battery cell group. The shell assembly can accommodate the battery cell group in the shell, which can reduce the range of movement and deformation of each soft-pack battery cell in the battery cell group, improve the stability of the position of the soft-pack battery cell in the battery device, and reduce the risk of the soft-pack battery cell moving due to vibration and impact, thereby causing leakage or short circuit of the soft-pack battery cell; in addition, the shell assembly includes a first shell and a second shell, and the first shell has a first opening and a second opening facing different directions. When the battery cell group is assembled into the shell, it is inserted into the shell through the first opening without deforming the first shell, which can improve the assembly accuracy of the battery cell group. After being assembled in place, the second shell and the first shell cooperate to form a constraint on the battery cell group to provide protection for the battery cell group. At the same time, it can also be bonded to the box through the second opening to further improve the position stability of the battery cell group. In addition, the shell assembly can also disperse external impact force, reduce the probability of a single soft-pack battery cell being subjected to excessive impact force, improve the service life of the soft-pack battery cell, and improve the service life of the battery device, thereby improving the overall performance of the electrical device.

[0060] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the box includes a second opening, and the floor covers the second opening.

[0061] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box includes a second opening, the floor cover is closed on the second opening, and the box of the battery device uses the vehicle's own floor as a box cover for sealing, which can reduce costs and improve space utilization, increase the capacity of the box and improve the height of the vehicle chassis.

[0062] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0064] Figure 2 is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0065] Figure 3 is a schematic structural diagram of a battery cell assembly according to some embodiments of the present application;

[0066] Figure 4 is a schematic structural diagram of a battery device according to other embodiments of the present application;

[0067] Figure 5 is a schematic structural diagram of a battery device according to some other embodiments of the present application;

[0068] Figure 6 yes Figure 3 An exploded view of a battery cell assembly is shown;

[0069] Figure 7 yes Figure 4 An exploded view of a battery cell assembly is shown.

[0070] Reference numerals:

[0071] 1. Electric device; 100. Battery device; 200. Controller; 300. Motor; 400. Battery cell assembly; 410. Shell assembly; 411. First shell; 412. Second shell; 413. First opening; 414. Accommodation cavity; 420. Cell group; 4201. Soft-pack battery cell; 422. First surface; 423. Second surface; 4111. First fixing part; 4112. Second fixing part; 4121. Third fixing part; 4122. Fourth fixing part; 4113. Fifth fixing part; 4211. Third surface; 4212. Fourth surface; 4213. Glue blocking structure; 415. Second opening; 430. Box; 440. Second opening; 450. Reinforcement part; X. Thickness direction of soft-pack battery cell; Y. Width direction of soft-pack battery cell. DETAILED DESCRIPTION

[0072] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0074] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0075] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0076] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0077] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0078] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0081] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0082] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0083] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0084] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0085] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0086] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0087] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0088] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0089] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application.

[0090] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0091] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0092] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on 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 sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0093] At the same time, battery cells mainly rely on the movement of metal ions between the positive electrode and the negative electrode to work. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charge and discharge process, Li+ is embedded and de-embedded back and forth between the two electrodes: when charging, Li+ is de-embedded from the positive electrode, embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0094] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery packs and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0095] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of energy density and reliability.

[0096] Since the soft-pack battery cell uses an aluminum-plastic film to wrap the electrode assembly and electrolyte, the aluminum-plastic film is light in weight and can significantly reduce the weight of the battery device and improve the energy density of the battery device.

[0097] However, when the battery device in the related art adopts soft-pack battery cells, the soft-pack battery cells in the box are prone to deformation due to their low structural strength and insufficient resistance to external impact, and the installation accuracy and grouping efficiency are low.

[0098] Based on the above considerations, in order to improve the deformation resistance of soft-pack battery cells and improve the grouping efficiency and assembly accuracy of soft-pack battery cells, the present application designs a battery device, in which the shell assembly of the battery device is divided into a first shell and a second shell. The first shell has a first opening and a second opening facing differently. When the battery cell group is assembled into the shell, the two first surfaces of the battery cell group along the thickness direction of the soft-pack battery cell enter the shell through the first opening. There is no need to deform the shell, which can improve the assembly accuracy of the soft-pack battery cell. After the assembly into the shell is completed, a first surface of the battery cell group faces the first opening, and the second shell is arranged on one side of the first opening and cooperates with the first shell, so that the entire battery cell group can be fixed. At the same time, at least one surface of the soft-pack battery cell can be bonded to the box through the second opening, which can improve the bonding strength between the soft-pack battery cell and the battery box, and at the same time improve the grouping efficiency of the soft-pack battery cell.

[0099] The embodiment of the present application provides an electric device using the battery pack or battery device disclosed herein 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.

[0100] For the convenience of explanation, the following embodiments take the electric device as a vehicle as an example to introduce the structures of the electric device, the battery device and the battery cell assembly of the present application in detail.

[0101] Please refer to Figure 1 , Figure 1 The power device 1 provided for some embodiments of the present application is a structural schematic diagram 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. The vehicle is provided with a battery device 100, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle. The battery device 100 can be used for powering 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 the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device 100 can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0102] Please refer to Figure 2 , Figure 2 The schematic diagram of the structure of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 430 and a battery cell assembly 400. The box body 430 is used to provide an assembly space for the battery cell assembly 400. The battery cell assembly 400 is accommodated in the box body 430.

[0103] Reference below Figure 3-Figure 7 A battery cell assembly 400 according to an embodiment of the first aspect of the present application is described. Figure 3 is a schematic structural diagram of a battery cell assembly 400 according to some embodiments of the present application; Figure 4 is a schematic structural diagram of a battery cell assembly 400 according to some other embodiments of the present application; Figure 5 is a schematic structural diagram of a battery cell assembly 400 according to some other embodiments of the present application; Figure 6 yes Figure 3 An exploded view of a battery cell assembly 400 is shown; Figure 7 yes Figure 4 An exploded view of a battery cell assembly 400 is shown.

[0104] The present application embodiment provides a battery device 100, including a battery cell assembly 400, a box body 430, and a bottom plate for supporting the battery cell assembly 400. Figure 3As shown, the battery cell assembly 400 includes: a shell assembly 410, a battery cell group 420, the shell assembly 410 includes a first shell 411 and a second shell 412, the first shell 411 has a first opening 413 and a second opening 415 facing different directions, the second shell 412 is arranged at the first opening 413, and together with the first shell 411 forms a accommodating cavity 414, the battery cell group 420 is arranged in the accommodating cavity 414, the battery cell group 420 includes at least one soft-pack battery cell 4201, at least one surface of the soft-pack battery cell 4201 is bonded to the box 430 through the second opening 415, the battery cell group 420 has two first surfaces 422 opposite to each other along the thickness direction X of the soft-pack battery cell, the two first surfaces 422 are both connected to the shell assembly 410, and one of the two first surfaces 422 is opposite to the first opening 413.

[0105] In some embodiments, the shell assembly 410 is "U"-shaped, the first shell 411 is "L"-shaped, and the second shell 412 is "I"-shaped. The first shell 411 and the second shell 412 cooperate to form a receiving cavity 414 to accommodate the battery cell group 420.

[0106] The first shell 411 has a first opening 413 and a second opening 415 facing in different directions, which means that the first shell 411 is provided with a first opening 413 on one side along the thickness direction of the soft-pack battery cell 4201, and a second opening 415 on one side along the width direction of the soft-pack battery cell 4201, and the first opening 413 and the second opening 415 are connected.

[0107] The battery cell group 420 includes at least one soft-pack battery cell 4201 , and the soft-pack battery cell 4201 is inserted into the first shell 411 through the first opening 413 to complete the assembly.

[0108] The second shell 412 is arranged at the first opening 413, which means that after the battery cell group 420 is assembled into the shell, the second shell 412 is arranged at the first opening 413 on one side of the first shell 411 along the thickness direction X of the soft-pack battery cell, and cooperates with the first shell 411 to form a accommodating cavity 414 to protect the battery cell group 420 together.

[0109] The first surface 422 refers to the surface of the battery cell group 420 opposite to the thickness direction X of the soft-pack battery cell. The first surface 422 is also the surface with the largest surface area of ​​the two soft-pack battery cells 4201 on both sides along the thickness direction X of the soft-pack battery cell.

[0110] The two first surfaces 422 are both connected to the shell assembly 410 , which means that the battery cell group 420 and the shell assembly 410 are connected as a whole, which can improve the ability of the soft-pack battery cell 4201 to resist impact deformation.

[0111] One of the two first surfaces 422 faces the first opening 413, which means that after the battery cell group 420 is assembled into the shell along the thickness direction X of the soft-pack battery cell, one of the first surfaces 422 is covered by the first shell 411, and the other first surface 422 faces the first opening 413 of the first shell 411 along the thickness direction X of the soft-pack battery cell, and is covered by the second shell 412.

[0112] In the embodiment of the present application, the shell assembly 410 is divided into a first shell 411 and a second shell 412. The first shell 411 has a first opening 413 and a second opening 415 facing in different directions. When the battery group 420 is put into the shell for assembly, the battery group 420 enters the shell through the first opening 413 along the thickness direction X of the soft-pack battery monomer. Compared with the solution in which the battery group 420 enters the shell when the first shell 411 and the second shell 412 are integrally arranged, the shell is easily deformed when the battery group 420 enters the shell. Since the first shell 411 and the second shell 412 are detachably matched, the battery group 420 is not easily deformed during the shell assembly process. Therefore, the structure is more stable, which can improve the reliability of the battery device 100. In addition, since the first opening 413 is directly opposite to the battery group 420 along the thickness direction X, the battery group 420 is easily deformed. The first surface 422 in the degree direction makes the first opening opposite to the larger surface of the soft-pack battery cell 4201, which can reduce the obstruction of the battery cell group 420 in the shell insertion process, further improve the reliability of the battery device 100, and improve the assembly accuracy of the soft-pack battery cell 4201. After the shell insertion and assembly are completed, a first surface 422 of the battery cell group 420 is opposite to the first opening 413, and the second shell 412 is arranged on one side of the first opening 413 and cooperates with the first shell 411, so as to fix the entire battery cell group 420. At the same time, at least one surface of the soft-pack battery cell 4201 can be bonded to the box body 430 through the second opening 415, which can improve the bonding force between the soft-pack battery cell 4201 and the box body 430, and at the same time improve the grouping efficiency of the soft-pack battery cell 4201.

[0113] In some embodiments of the present application, the battery cell group 420 has two second surfaces 423 opposite to each other along the width direction Y of the soft-pack battery cell, the two second surfaces 423 are arranged between the two first surfaces 422, the first shell 411 includes a first fixing portion 4111 and a second fixing portion 4112, the first fixing portion 4111 covers at least a portion of one of the first surfaces 422 along the thickness direction X of the soft-pack battery cell, the second fixing portion 4112 is connected to a side of the first fixing portion 4111 along the thickness direction X of the soft-pack battery cell, and covers at least a portion of the second surface 423 of the battery cell group 420 along the width direction Y of the soft-pack battery cell, and the second shell 412 includes a third fixing portion 4121, the third fixing portion 4121 is arranged on a side of the second fixing portion 4112 away from the first fixing portion 4111, and covers at least a portion of the other first surface 422 along the thickness direction X of the soft-pack battery cell.

[0114] The first shell 411 includes a first fixing portion 4111 and a second fixing portion 4112 that are connected to each other. The first fixing portion 4111 is a plate-like structure, and the first fixing portion 4111 covers at least a portion of a first surface 422 of the battery cell group 420 along the thickness direction X of the soft-pack battery cell. The second fixing portion 4112 is a plate-like structure, and the second fixing portion 4112 covers at least a portion of a second surface 423 of the battery cell group 420 along the width direction of the soft-pack battery cell 4201, forming an "L"-shaped shell structure.

[0115] The third fixing portion 4121 of the second shell 412 is disposed opposite to the first fixing portion 4111 along the thickness direction X of the soft-pack battery cell to form an “I”-shaped shell structure. The third fixing portion 4121 is a plate-like structure that covers at least a portion of the other first surface 422 .

[0116] The first shell 411 and the second shell 412 cooperate to protect the battery cell group 420 , reduce the risk of deformation or displacement of the soft-pack battery cell 4201 , and further reduce the possibility of leakage or short circuit of the soft-pack battery cell 4201 .

[0117] In the embodiment of the present application, the first fixing portion 4111 of the first shell 411 covers at least a portion of a first surface 422 of the battery cell group 420, the second fixing portion 4112 covers at least a portion of the second surface 423, and the third fixing portion 4121 of the second shell 412 covers at least a portion of another first surface 422. Through the detachable cooperation between the first shell 411 and the second shell 412, when the battery cell group 420 is put into the shell, the shell is not easy to be deformed and the shell is not easy to be stretched open, thereby improving the assembly accuracy and assembly efficiency. At the same time, the first fixing portion 4111, the second fixing portion 4112 and the third fixing portion 4121 can provide support and protection for the battery cell group 420 in the thickness direction X and the width direction of the soft-pack battery cell, thereby improving the overall strength of the battery cell group 420.

[0118] In some embodiments of the present application, reference Figure 4 The second shell 412 also includes a fourth fixing portion 4122, which is connected to one side of the third fixing portion 4121 along the width direction Y of the soft-pack battery cell, and is docked with the second fixing portion 4112, and together covers the second surface 423 of the battery cell group 420.

[0119] The fourth fixing portion 4122 is in a plate-like structure and is butt-jointed with the second fixing portion 4112 along the thickness direction X of the soft-pack battery cell. There may be a gap between the first fixing portion 4111 and the second fixing portion 4112 , or they may contact each other.

[0120] The fourth fixing portion 4122 cooperates with the second fixing portion 4112 to provide protection for the battery cell group 420, reduce the risk of the battery cell group 420 being located along the width direction of the soft-pack battery cell 4201 due to vibration impact, and reduce the possibility of short circuit leakage of the soft-pack battery cell 4201.

[0121] In the embodiment of the present application, the fourth fixing portion 4122 of the second shell 412 is connected to the second fixing portion 4112 to jointly cover the second surface 423 of the battery cell group 420, thereby strengthening the constraint on the battery cell group 420 along the width direction of the soft-pack battery cell 4201 and improving the ability of the soft-pack battery cell 4201 to resist vibration and impact.

[0122] In some embodiments of the present application, the docking position of the second fixing portion 4112 and the fourth fixing portion 4122 is located at the midpoint of the line connecting the two first surfaces 422 .

[0123] The docking position of the second fixing portion 4112 and the fourth fixing portion 4122 is located at the midpoint of the line connecting the two first surfaces 422, which means that the second fixing portion 4112 and the fourth fixing portion 4122 completely cover the second surface 423 of the battery cell group 420 without any gap therebetween, and the second fixing portion 4112 and the fourth fixing portion 4122 respectively cover half of the second surface 423.

[0124] In the embodiment of the present application, the docking position of the second fixing portion 4112 and the fourth fixing portion 4122 is located at the midpoint of the line connecting the two first surfaces 422, so as to ensure that the second fixing portion 4112 and the fourth fixing portion 4122 completely cover the second surface 423, thereby further improving the vibration and impact resistance of the battery cell group 420 along the width direction Y of the soft-pack battery cell.

[0125] In some embodiments of the present application, reference Figure 5 The first shell 411 also includes a fifth fixing portion 4113, which is connected to a side of the second fixing portion 4112 away from the first fixing portion 4111, and is docked with the third fixing portion 4121 along the width direction Y of the soft-pack battery cell, and together with the third fixing portion 4121 along the thickness direction X of the soft-pack battery cell, covers another first surface 422.

[0126] The soft-pack battery cell 4201 includes two third surfaces 4211 and two fourth surfaces 4212 that are arranged opposite to each other. The surface area of ​​the third surface 4211 is greater than that of the fourth surface 4212. The third surfaces 4211 are two opposite surfaces along the thickness direction X of the soft-pack battery cell and are the surfaces with the largest surface area. The fourth surfaces 4212 are two opposite surfaces along the width direction Y of the soft-pack battery cell. The third surface 4211 and the fourth surface 4212 can be connected by an R angle. The third surface 4211 of the soft-pack battery cell 4201 located at the end of the battery cell group 420 forms two first surfaces 422 of the battery cell group 420, and the fourth surfaces 4212 of each soft-pack battery cell 4201 together form the second surface 423 of the battery cell group 420.

[0127] The fifth fixing portion 4113 is a plate-like structure, extending along the width direction Y of the soft-pack battery cell to cover the R corner of the end soft-pack battery cell 4201 of the battery cell group 420 near the first opening 413, or can continue to extend to the third surface 4211. When the soft-pack battery cell 4201 is assembled into the shell, there is no need to deform the shell assembly 410, which can improve the assembly accuracy. After the assembly is completed to form the battery cell group 420, the first fixing portion 4111 and the fifth fixing portion 4113 can pre-position the battery cell group 420 along the thickness direction X of the soft-pack battery cell, thereby reducing the risk of displacement of the soft-pack battery cell 4201.

[0128] The third fixing portion 4121 and the fifth fixing portion 4113 are butt-jointedly arranged along the width direction Y of the soft-pack battery cell. The third fixing portion 4121 can cover the third surface 4211 of the end soft-pack battery cell 4201 and another R angle relative to the width direction Y of the soft-pack battery cell to ensure that there is sufficient coverage area for the first surface 422 of the battery cell group 420 close to the first opening 413, thereby reducing the risk of displacement of the battery cell group 420. When impacted along the thickness direction X of the soft-pack battery cell, the third fixing portion 4121 and the fifth fixing portion 4113 can resist the impact, thereby reducing the risk of deformation of the soft-pack battery cell 4201.

[0129] In the above-mentioned embodiment, the first fixing portion 4111 covers at least a portion of a first surface 422 of the battery cell group 420, the fifth fixing portion 4113 covers a portion of the other first surface 422 of the battery cell group 420, the second fixing portion 4112 covers the second surface 423, and the first fixing portion 4111 and the fifth fixing portion 4113 are connected as a whole, so as to strengthen the fixing effect on the entire battery cell group 420. At the same time, the fifth fixing portion 4113 has a pre-positioning effect on the entire battery cell group 420 after entering the shell, which can reduce the position of the battery cell group 420. The displacement in the thickness direction X of the soft-pack battery cell is reduced. The third fixing portion 4121 and the fifth fixing portion 4113 are butt-jointedly arranged along the width direction Y of the soft-pack battery cell, ensuring that the other first surface 422 of the battery cell group 420 has sufficient coverage area, which is beneficial to the fixation of the battery cell group 420, improves the vibration and impact resistance of the battery cell group 420, and improves the reliability of the soft-pack battery cell 4201.

[0130] In some embodiments of the present application, the docking position between the third fixing portion 4121 and the fifth fixing portion 4113 is located in the middle of the width of the soft-pack battery cell 4201 .

[0131] The third fixing portion 4121 and the fifth fixing portion 4113 are docked along the width direction Y of the soft-pack battery cell, and the docking position is located in the middle of the first surface 422 of the battery cell group 420, ensuring that there is no gap between the third fixing portion 4121 and the fifth fixing portion 4113, and can completely cover the first surface 422 of the battery cell group 420 close to the first opening 413, thereby strengthening the protection of the battery cell group 420 and reducing the risk of deformation of the soft-pack battery cell 4201 due to external impact.

[0132] In the above embodiment, the docking position of the third fixing portion 4121 and the fifth fixing portion 4113 is located in the middle of the width of the soft-pack battery cell 4201, and the third fixing portion 4121 extends to the middle of the first surface 422. After the soft-pack battery cell 4201 is assembled into the shell, the battery cell group 420 can be limited along the thickness direction of the soft-pack battery cell 4201 to reduce the movement of the soft-pack battery cell 4201. The two together cover the first surface 422 of the battery cell group 420, thereby increasing the restraint force on the battery cell group 420 along the thickness direction X of the soft-pack battery cell. At the same time, the first surface 422 of the battery cell group 420 can be avoided from being exposed, thereby reducing the risk of external foreign matter entering and causing damage to the soft-pack battery cell 4201.

[0133] In some embodiments of the present application, the soft-pack battery cell 4201 includes a shell and an electrode assembly, the shell wraps the electrode assembly, and the electrode assembly is formed by winding or stacking electrode sheets.

[0134] The outer shell of the soft-pack battery cell 4201 can be an aluminum-plastic film, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator that are stacked.

[0135] The electrode assembly can be formed by winding or stacking the pole pieces, which can provide more choices for the selection of the soft-pack battery cell 4201. Different types of electrode assemblies can be selected according to different application scenarios, which makes the selection more flexible.

[0136] In some embodiments of the present application, the battery cell assembly 400 includes a plurality of shell assemblies 410 , which are arranged in sequence along the thickness direction X of the soft-pack battery cell, and a battery cell group 420 is disposed in the accommodating cavity 414 of each shell assembly 410 .

[0137] The battery cell assembly 400 includes a plurality of shell assemblies 410 sequentially arranged along the thickness direction of the soft-pack battery cell 4201 , and a battery cell group 420 is disposed in the accommodating cavity 414 of each shell assembly 410 , which can improve the grouping efficiency of the battery cell assembly 400 .

[0138] At the same time, multiple shell components 410 form multiple accommodating cavities 414 to accommodate different battery cell groups 420 respectively. When thermal runaway occurs in one of the battery cell groups 420, the thermal runaway is not easily transmitted to the adjacent battery cell group 420 due to the separation and blocking of the shell component 410, which can reduce the risk of heat spread.

[0139] The multiple shell assemblies 410 are connected to each other to form a whole, which can improve the deformation resistance of the entire battery cell assembly 400 when subjected to external impact and reduce the risk of leakage caused by deformation of the soft-pack battery cell 4201.

[0140] In the above technical solution, the battery cell assembly 400 includes a plurality of shell assemblies 410, and a cell group 420 is arranged in the accommodating cavity 414 of each shell assembly 410, which can further improve the grouping efficiency of the soft-pack battery cell 4201. At the same time, adjacent cell groups 420 are respectively accommodated in the accommodating cavities 414 of different shell assemblies 410. When thermal runaway occurs in one of the cell groups 420, the shell assembly 410 can prevent the thermal runaway from spreading to the adjacent cell group 420, thereby reducing the risk of thermal diffusion of the battery cell assembly 400.

[0141] In some embodiments of the present application, at least two adjacent housing components 410 share a portion of the housing.

[0142] The battery cell group includes a plurality of shell assemblies 410 arranged in sequence along the thickness direction X of the soft-pack battery cell. At least two adjacent shell assemblies 410 share part of the shell, which can save materials and reduce the manufacturing cost of the shell assembly 410. The shared shell can also reduce the volume of the battery cell assembly 400, reduce the space occupied by the battery device 100 box 430, and improve the volume utilization rate of the box 430 space.

[0143] In the above technical solution, at least two adjacent shell assemblies 410 share part of the shell, which can save materials and reduce production costs. At the same time, the shared shell can reduce the space occupied by the shell assembly 410 in the battery box 430, improve the battery energy density, and also help to improve the assembly efficiency of the battery cell assembly 400.

[0144] In some embodiments of the present application, the soft-pack battery cell 4201 includes two oppositely disposed third surfaces 4211 and two oppositely disposed fourth surfaces 4212, the surface area of ​​the third surface 4211 is larger than the fourth surface 4212, the third surfaces 4211 of the soft-pack battery cells 4201 located on both sides of the same accommodating cavity 414 form the first surface 422 of the battery cell group 420, and the fourth surfaces 4212 of all the soft-pack battery cells 4201 located in the same accommodating cavity 414 jointly form the second surface 423 of the battery cell group 420, and any two adjacent shell assemblies 410, one of which has a first shell 411 covering a portion of the first surface 422 of the corresponding battery cell group 420 along the thickness direction X of the soft-pack battery cell and the other of which has a second shell 412 covering a portion of the first surface 422 of the corresponding battery cell group 420 along the thickness direction X of the soft-pack battery cell share a shell.

[0145] Any two adjacent battery cell groups 420 are separated by two shell components 410. Along the thickness direction X of the soft-pack battery cell, the first shell 411 of one shell component 410 covers the first surface 422 of the corresponding battery cell group 420, and the second shell 412 of the other shell component 410 covers the first surface 422 of the corresponding battery cell group 420. The first shell 411 of one shell component 410 can serve as the second shell 412 of the other shell component 410. Similarly, the second shell 412 of the other shell component 410 can serve as the first shell 411 of one shell component 410 to realize the function of a shared shell.

[0146] In some embodiments, the shell assembly 410 corresponding to the two first surfaces 422 of any two adjacent battery cell groups 420 that are close to each other along the thickness direction X of the soft-pack battery cell can share a shell. For example, the first surface 422 of one of the battery cell groups 420 is the surface facing the first opening 413 of the first shell 411, and the corresponding first surface 422 of the other battery cell group 420 can be the surface away from the first opening 413 of the corresponding first shell 411, and vice versa.

[0147] In the above technical solution, any two adjacent shell assemblies 410, one of which has a first shell 411 covering a portion of the first surface 422 of the battery cell group 420 corresponding to the accommodating cavity 414, and the other of which has a second shell 412 covering a portion of the first surface 422 of the battery cell group 420 corresponding to the accommodating cavity 414, share a shell, which can reduce the space occupied by the shell assembly 410, improve the grouping efficiency, and improve the assembly accuracy of the battery cell group 420.

[0148] In some embodiments, the third surface 4211 and the fourth surface 4212 of any soft-pack battery cell 4201 are connected by a transition portion.

[0149] Since the shell of the soft-pack battery cell 4201 is usually an aluminum-plastic film, the shell strength is insufficient. In order to reduce the risk of shell cracking during molding, the third surface 4211 and the fourth surface 4212 need to be connected by a transition portion.

[0150] In the above technical solution, the third surface 4211 and the fourth surface 4212 of any soft-pack battery cell 4201 are connected via a transition portion, which can increase the connection strength and reduce the risk of cracking of the shell of the soft-pack battery cell 4201 .

[0151] In some embodiments, the transition portion is an R angle.

[0152] In the above technical solution, the transition portion is an R angle, which is beneficial to the processing and manufacturing of the shell of the soft-pack battery cell 4201, improves the ability of the shell to resist cracking, and can improve the production efficiency of the soft-pack battery cell 4201.

[0153] In some embodiments, a glue blocking structure 4213 is disposed between R corners of any two adjacent soft-pack battery cells 4201 in the same accommodating cavity 414 , and the glue blocking structure 4213 is disposed at the bottom of the box body 430 .

[0154] Optionally, in some embodiments, a glue blocking structure 4213 is provided between the R corners of the soft-pack battery cells 4201 on both sides of the thickness direction X of the soft-pack battery cells in the same accommodating cavity 414 and the shell assembly 410 .

[0155] Since the side of the soft-pack battery cell close to the second opening 415 needs to be bonded to the bottom of the box body 430, in order to ensure the bonding area and avoid stress concentration in the R corner area after the glue is cured, it is necessary to set a glue blocking structure 4213 between the R corners of two adjacent soft-pack battery cells 4201 and between the R corners of the soft-pack battery cells 4201 on both sides and the shell assembly 410 to reduce the risk of glue overflow and reduce the risk of stress concentration in the R corner area.

[0156] The rubber blocking structure 4213 may be a boss provided at the bottom of the box body 430 , or a rubber blocking strip, etc.

[0157] In the above technical solution, a glue blocking structure 4213 is arranged between the R corners of any two adjacent soft-pack battery cells 4201 in the same accommodating cavity 414, which can prevent glue from overflowing to the R corner when the soft-pack battery cell 4201 is bonded to the box body 430, thereby reducing the risk of stress concentration at the R corner of the soft-pack battery cell 4201.

[0158] In some embodiments, the glue blocking structure is a glue blocking strip.

[0159] In the above technical solution, the glue blocking structure is a glue blocking strip, which can be directly bonded to the bottom of the box body 430, and has a simple structure, convenient installation and high reliability.

[0160] In some embodiments of the present application, see Figure 6 and Figure 7 The battery device 100 further includes an adhesive, the battery cell group 420 includes a plurality of soft-pack battery cells 4201, and the third surfaces 4211 of the plurality of soft-pack battery cells 4201 and the third surface 4211 and the shell assembly 410 are connected to each other through the adhesive.

[0161] The battery cell group 420 includes a plurality of soft-pack battery cells 4201, each of which includes two third surfaces 4211 arranged opposite to each other along its thickness direction, the third surface 4211 being the surface with the largest surface area of ​​the soft-pack battery cell 4201, the third surfaces 4211 of the plurality of soft-pack battery cells 4201 are bonded to each other by an adhesive to form the battery cell group 420, and the battery cell group 420 and the shell assembly 410 are also bonded to form a whole by an adhesive, so that the structure of the battery cell assembly 400 is more compact, and the shell assembly 410 has a better fixing and protecting effect on the soft-pack battery cells 4201. After the soft-pack battery cells 4201 are bonded to form the battery cell group 420, displacement and deformation are not likely to occur, and after the shell assembly 410 and the battery cell group 420 are bonded, the risk of relative displacement between the shell assembly 410 and the battery cell group 420 can be reduced, and the stability of the shell assembly 410 in supporting and protecting the battery cell group 420 can be improved.

[0162] When the soft-pack battery cells 4201 are put into the shell for assembly, an adhesive can be pre-coated on the third surface 4211 of each soft-pack battery cell 4201, and an adhesive can be coated on the shell portion of the shell assembly 410 corresponding to the third surface 4211. The soft-pack battery cells 4201 are put into the shell one by one, and the third surfaces 4211 and the third surface 4211 and the shell assembly 410 are bonded to each other to form a whole, which can improve the grouping efficiency and assembly accuracy.

[0163] In the above technical solution, the battery device 100 includes an adhesive, the battery cell group 420 includes a plurality of soft-pack battery cells 4201, and the third surfaces 4211 of the plurality of soft-pack battery cells 4201, as well as the third surface 4211 and the shell assembly 410 are connected to each other through the adhesive, so that the plurality of soft-pack battery cells 4201 can be connected to the shell assembly 410 as a whole, thereby improving the ability of a single soft-pack battery cell 4201 to resist vibration and impact, and reducing the risk of deformation and damage of the soft-pack battery cell 4201.

[0164] In some embodiments of the present application, the first opening 413 is disposed on one side of the thickness direction X of the soft-pack battery cell, and the second opening 415 is disposed on one side of the width direction Y of the soft-pack battery cell.

[0165] The first shell 411 of the shell assembly 410 includes a first opening 413 and a second opening 415 facing different directions. The first opening 413 and the second opening 415 are formed by an opening of the first shell 411 on one side along the thickness direction of the soft-pack battery cell 4201 and an opening on one side along the width direction. After the battery cell group 420 is assembled into the shell, the second shell 412 covers the first opening 413 on one side along the thickness direction to form a final battery cell assembly 400.

[0166] In the above technical solution, the first shell 411 includes a first opening 413 along the thickness direction X of the soft-pack battery cell and a second opening 415 in the width direction. The soft-pack battery cell 4201 can be assembled into the shell through the first opening 413 without deforming the shell, which is beneficial to improving assembly efficiency. After the shell is inserted, it can be bonded to the box body 430 through the second opening 415, which is beneficial to improving the position stability of the battery cell group 420.

[0167] In some embodiments of the present application, along the thickness direction X of the soft-pack battery cell, the second openings 415 of any two adjacent shell components 410 face opposite directions.

[0168] The second openings 415 of the first shells 411 of any two adjacent shell assemblies 410 along the width direction Y of the soft-pack battery cell 4201 face in opposite directions.

[0169] In the above technical solution, along the thickness direction X of the soft-pack battery cell, the second openings 415 of any two adjacent shell components 410 face opposite directions. When a soft-pack battery cell 4201 accommodated in one of the shell components 410 experiences thermal runaway, since the second openings 415 of the shell components 410 face opposite directions, the thermal runaway can be prevented from spreading to the battery cell group 420 accommodated in the adjacent shell component 410, thereby reducing the risk of heat spread.

[0170] In some embodiments of the present application, the material of the housing assembly 410 is metal or plastic.

[0171] Optionally, in some embodiments, when the material of the shell component 410 is metal, it can be aluminum or steel, etc. When the material of the shell component 410 is plastic, it can be a composite material with higher hardness or non-metallic materials such as PA, PC, PET, etc.

[0172] The material of the shell assembly 410 is metal or plastic. Compared with the aluminum-plastic film shell of the soft-pack battery cell 4201, it has a stable structure and higher strength, which can reduce the probability of deformation of the accommodating cavity 414 where the battery cell group 420 is located, effectively protect the soft-pack battery cell 4201, and improve the stability and service life of the battery cell group 420.

[0173] In the above technical solution, the material of the shell component 410 is metal or plastic, and its hardness is higher than the outer shell of the soft-pack battery cell 4201. When subjected to external vibration and impact, the shell component 410 can provide support and protection for the soft-pack battery cell 4201, reducing the risk of deformation and damage of the soft-pack battery cell 4201.

[0174] In some embodiments of the present application, the soft-pack battery cell 4201 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0175] In this embodiment, the soft-pack battery cell 4201 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell. The lithium iron phosphate battery cell has the advantages of high reliability, long cycle life, good high temperature performance, etc. The ternary battery cell has the advantages of high energy density, fast charging, etc. The solid-state battery cell has the advantages of high reliability, high energy density, long cycle life, etc. For example, the solid-state battery cell can be a sulfide solid-state battery, an oxide solid-state battery or a polymer solid-state battery, a composite solid-state electrolyte battery, a garnet solid-state battery, etc.

[0176] As an optional scheme, in some embodiments, when the soft-pack battery cell 4201 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 4201, 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 may 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 may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.). Exemplarily, when the soft-pack battery cell 4201 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 10 grams. When the soft-pack battery cell 4201 is a ternary battery cell, in the positive electrode material of the battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2 to 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 to 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 oxide lithium system, nickel cobalt 15 aluminum oxide lithium system, etc. For example, the ternary material of the ternary battery cell can be eight series LiNi0.8Co0.1Mn0.1O 2 The weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5. That is to say, the total weight of the positive electrode material is divided into 100 parts. 2The proportion is 96 parts, the proportion of binder is 2.5 parts, and the proportion of conductive agent is 1.5 parts. In the above technical solution, when the soft-pack battery cell 4201 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 increase the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output higher power in a relatively small volume and weight, and meet 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 100. When the soft-pack battery cell 4201 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 material, binder, and conductive agent 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.

[0177] In the above technical solution, the soft-pack battery cell 4201 is set to be any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell 4201 can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 4201 wider, so that the battery device 100 can better meet different usage requirements.

[0178] In some embodiments of the present application, the shell assembly 410 includes a second opening 415 , which is connected to the accommodating cavity 414 . A reinforcement portion 450 is provided near the second opening 415 of the shell assembly 410 , and the shell assembly 410 is connected to the base plate via the reinforcement portion 450 .

[0179] The battery cell assembly 400 is fixedly connected to the bottom plate of the box body 430 through the shell assembly 410, the second opening 415 is close to the bottom plate of the box body 430, and the reinforcement part 450 is arranged close to the second opening 415, which can improve the shell strength of the shell assembly 410, so that the second opening 415 is not easy to deform, and can effectively fix the battery cell group 420, while ensuring the stability of the connection between the battery cell assembly 400 and the box body 430, and can provide stable support for the soft-pack battery cell 4201 to prevent the soft-pack battery cell 4201 from being deformed by external impact, and can disperse the external impact force to the entire box body 430, thereby improving the service life of the soft-pack battery cell 4201.

[0180] In the above technical solution, the shell assembly 410 includes a second opening 415, which is connected to the accommodating cavity 414. A reinforcing portion 450 is provided at a position of the shell assembly 410 near the second opening 415. The shell assembly 410 is connected to the bottom plate through the reinforcing portion 450, so that the battery cell assembly 400 and the box 430 of the battery device 100 can be connected into a whole, which can further improve the ability of the soft-pack battery cell 4201 to resist vibration and impact, and reduce the risk of deformation and displacement of the soft-pack battery cell 4201. At the same time, the reinforcing portion 450 can improve the strength of the shell assembly 410, so that the shell assembly 410 is not easy to deform, thereby providing better protection for the battery cell group 420.

[0181] In some embodiments of the application, a slot is provided on the bottom plate of the box body 430, and the reinforcing portion 450 is inserted into the slot.

[0182] In the above technical solution, a slot is provided in the bottom plate, and the reinforcing part 450 is inserted into the slot, which can improve the connection strength between the shell assembly 410 and the bottom plate of the box body 430, and is not easy to separate from the box body 430 when subjected to vibration impact. The impact force can be dispersed to the entire box body 430, so that the force is evenly applied to the shell assembly 410 and it is not easy to deform. At the same time, the reinforcing part 450 is inserted into the slot, which can reduce the size of the shell assembly 410 along the width direction of the soft-pack battery cell 4201, which is beneficial to saving space in the box body 430 and improving space utilization.

[0183] In some embodiments of the present application, the battery device 100 further includes a thermally conductive structural adhesive, and a side of the soft-pack battery cell 4201 close to the second opening 415 is bonded to the bottom plate by the thermally conductive structural adhesive.

[0184] The side of the soft-pack battery cell 4201 close to the second opening 415 may be the fourth surface 4212 of the soft-pack battery cell 4201 close to the second opening 415. The fourth surfaces 4212 of multiple soft-pack battery cells 4201 close to the second opening 415 are bonded to the bottom plate of the box 430 through a thermally conductive structural adhesive, which can enhance the bonding strength between the battery cell group 420 and the box 430. When subjected to external impact and vibration, the soft-pack battery cell 4201 is not easily displaced or deformed.

[0185] The side of the soft-pack battery cell 4201 close to the second opening 415 is bonded to the bottom plate by a thermally conductive structural adhesive. On the basis that the reinforcement portion 450 of the shell assembly 410 is fixed to the bottom plate through a slot, the soft-pack battery cell 4201 is bonded to the bottom plate by the thermally conductive structural adhesive, which can further enhance the connection strength between the battery cell assembly 400 and the box body 430 and reduce the risk of displacement and deformation of the soft-pack battery cell 4201. At the same time, the thermally conductive structural adhesive can conduct the heat generated by the soft-pack battery cell 4201 to the bottom plate of the box body 430, which is beneficial to reduce the temperature of the soft-pack battery cell 4201 and reduce the risk of thermal runaway.

[0186] In some embodiments of the present application, the bottom plate is a heat exchange plate, and the soft-pack battery cell is bonded to the heat exchange plate by a heat-conducting structural adhesive. A heat exchange flow channel is formed in the heat exchange plate, and the heat exchange flow channel is used to accommodate and flow a heat exchange medium. The heat exchange medium can contact the soft-pack battery cell 4201 at intervals through the heat exchange plate to exchange heat with the soft-pack battery cell 4201.

[0187] Due to the heat exchange between the heat exchange plate and the soft-pack battery cell 4201, when the temperature of the soft-pack battery cell 4201 is high, the heat can be transferred to the heat exchange component by heat conduction, so that the soft-pack battery cell 4201 is in a suitable operating temperature range, thereby improving the service life of the battery device 100. When the temperature of the soft-pack battery cell 4201 is too low, the heat exchange medium can heat the soft-pack battery cell 4201 through the heat exchange component to improve the charging and discharging efficiency of the soft-pack battery cell 4201.

[0188] In the above technical solution, by integrating the heat exchange plate with the bottom plate of the box 430 for heat exchange with the soft-pack battery cell 4201, the soft-pack battery cell 4201 can be kept in a suitable operating temperature range, the charging and discharging efficiency of the soft-pack battery cell 4201 can be improved, and the service life of the battery device 100 can be increased. At the same time, the risk of thermal runaway of the soft-pack battery cell 4201 can be further reduced, and the space utilization of the box can also be improved.

[0189] In some embodiments of the present application, the reinforcement portion 450 is formed by bending the shell of the shell assembly 410 .

[0190] In the above technical solution, the reinforcing portion 450 is formed by bending the shell of the shell assembly 410. The reinforcing portion 450 and the shell assembly 410 are integrally formed, which is conducive to simplifying the processing technology, improving the production cycle, and does not introduce new components, which is conducive to reducing production costs.

[0191] In some embodiments of the present application, the reinforcement portion 450 is wavy in shape.

[0192] In the above technical solution, the reinforcing part 450 is set to a wave shape, which can further improve the shell strength of the shell assembly 410. The fixing part is not easy to deform, and can provide stable support and protection for the battery cell group 420, reducing the risk of deformation and displacement of the soft-pack battery cell 4201.

[0193] In some embodiments of the present application, the reinforcement portion 450 is formed by locally thickening the shell of the shell assembly 410 .

[0194] In the above technical solution, the reinforcement part 450 is formed by partially thickening the shell of the shell assembly 410, which can reduce the processing difficulty of the reinforcement part 450, facilitate production and manufacturing, and improve production efficiency.

[0195] In some embodiments of the present application, the battery device 100 further includes an expansion beam, which is connected to the bottom plate, and the shell assembly 410 abuts against the expansion beam along the thickness direction X of the soft-pack battery cell.

[0196] The expansion beam is generally in contact with both sides of the shell assembly 410 of the battery cell assembly 400 along the thickness direction X of the soft-pack battery cell, which can absorb the expansion force of the soft-pack battery cell 4201, reduce the risk of deformation of the shell assembly 410, ensure that the shell assembly 410 can stably maintain the position of the battery cell group 420, and reduce the risk of displacement and deformation of the soft-pack battery cell 4201, thereby causing short circuit and leakage.

[0197] In the above technical solution, the battery device 100 also includes an expansion beam, which is connected to the bottom plate. The shell assembly 410 abuts against the expansion beam along the thickness direction X of the soft-pack battery cell, which can reduce the number of components inside the box body 430, improve the internal space utilization of the box body 430, and accommodate more battery cell assemblies 400, which is beneficial to improving the capacity of the battery device 100. The expansion beam abuts against the shell assembly 410 along the thickness direction X of the soft-pack battery cell, which can absorb the expansion force of the soft-pack battery cell 4201 and reduce the risk of deformation and damage of the shell assembly 410.

[0198] In a second aspect, the present application provides an electrical device, including the battery device 100 according to the first aspect of the present application.

[0199] In the above-mentioned embodiment, by setting the battery device 100 of the first aspect, the battery cell assembly 400 includes a shell assembly 410, and the shell assembly 410 can accommodate the battery cell group 420 in the shell, which can reduce the range of movement and deformation of each soft-pack battery cell 4201 in the battery cell group 420, improve the stability of the position of the soft-pack battery cell 4201 in the battery cell assembly 400, and reduce the risk of the soft-pack battery cell 4201 moving due to vibration and impact, thereby causing leakage or short circuit of the soft-pack battery cell 4201; in addition, the shell assembly 410 includes a first shell 411 and a second shell 412, and the first shell 411 has a first opening 413 and a second opening 415 facing different directions. When the battery cell group 420 is inserted into the shell for assembly, it is inserted into the shell through the first opening 413 without deforming the first shell 411, which can improve the assembly accuracy of the battery cell group 420. After being assembled in place, the second shell 412 and the first shell 411 cooperate to constrain the battery cell group 420 to provide protection for the battery cell group 420. At the same time, the second opening 415 can be bonded to the box 430 to further improve the position stability of the battery pack 420. In addition, the shell assembly 410 can also disperse external impact force, reduce the probability of a single soft-pack battery cell 4201 being subjected to excessive impact force, increase the service life of the soft-pack battery cell 4201, increase the service life of the battery device 100, and thus improve the overall performance of the electrical device.

[0200] In some embodiments of the present application, the electrical device includes a vehicle, the vehicle includes a floor, the box 430 includes a second opening 440 , and the floor covers the second opening 440 .

[0201] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box body 430 includes a second opening 440, and the floor cover is closed on the second opening 440. The box body 430 of the battery device 100 uses the floor of the vehicle itself as a box cover for sealing, which can reduce costs and improve space utilization, increase the capacity of the box body 430, and improve the height of the vehicle chassis.

[0202] The following will refer to Figure 3 and Figure 6 A battery device 100 according to a specific embodiment of the present application is described.

[0203] The battery device 100 includes: a box body 430, a battery cell assembly 400 and a heat exchange plate. The box body 430 is in a rectangular parallelepiped shape and has a second opening 440 on the top of the box body 430. The battery cell assembly 400 is assembled into the box through the second opening 440 on the top of the box body 430.

[0204] The battery cell assembly 400 is placed inside the box 430 and supported on the bottom plate of the box 430. The battery cell assembly 400 includes a plurality of shell assemblies 410 arranged in sequence along the thickness direction X of the soft-pack battery cell, and battery cell groups 420 respectively accommodated in the accommodating cavities 414 of the corresponding shell assemblies 410. Each battery cell group 420 includes one or more soft-pack battery cells 4201.

[0205] The shell assembly 410 includes a first shell 411 and a second shell 412. The first shell 411 is provided with a first opening 413 and a second opening 415 facing different directions, and is in an "L" shape. The first opening 413 and the second opening 415 are formed by an opening on one side of the thickness direction X of the soft-pack battery cell and an opening on one side of the width direction Y of the soft-pack battery cell. The second shell 412 is in an "I" shape and is arranged at the first opening 413 of the first shell 411, specifically, at the opening of the first shell 411 along the thickness direction of the soft-pack battery cell 4201.

[0206] The soft-pack battery cell 4201 includes two third surfaces 4211 arranged opposite to each other along its thickness direction and two fourth surfaces 4212 arranged opposite to each other along its width direction. Multiple soft-pack battery cells 4201 are assembled into the shell along its thickness direction through the first opening 413 structure. The third surfaces 4211 of the soft-pack battery cells 4201 on both sides of the thickness direction form two first surfaces 422 of the battery cell group 420, and the fourth surfaces 4212 of each soft-pack battery cell 4201 on both sides of the width direction form two second surfaces 423 of the battery cell group 420.

[0207] The third surface 4211 and the fourth surface 4212 of any soft-pack battery cell 4201 are connected via an R angle, and a glue blocking structure 4213 is provided between the R angles of two adjacent soft-pack battery cells 4201 in the same accommodating cavity 414 .

[0208] The first shell 411 includes a first fixing portion 4111 and a second fixing portion 4112 connected to each other, the first fixing portion 4111 covers a first surface 422 of the battery cell group 420 away from the first opening 413 structure along the thickness direction X of the soft-pack battery cell, the second fixing portion 4112 covers a second surface 423 of the battery cell group 420, and the second shell 412 includes a third fixing portion 4121, and the third fixing portion 4121 covers another first surface 422 of the battery cell group 420 facing the first opening 413.

[0209] In the same housing assembly 410 , the third surface 4211 , the first fixing portion 4111 , and the third fixing portion 4121 of each soft-pack battery cell 4201 are coated with adhesive, so that the plurality of soft-pack battery cells 4201 and the housing assembly 410 are connected as a whole.

[0210] Along the thickness direction X of the soft-pack battery cell, any two adjacent shell components 410 share a shell. Specifically, the first shell 411 or the second shell 412 of one shell component 410 covers a portion of the first surface 422 facing the first opening 413 and the second shell 412 or the first shell 411 of another adjacent shell component 410 covers a portion of the first surface 422 away from the first opening 413.

[0211] The shell assembly 410 is provided with a second opening 415 along the width direction Y of the soft-pack battery cell. The second opening 415 is connected to the accommodating cavity 414 of the shell assembly 410. The shell assembly 410 is provided with a reinforcing portion 450 near the second opening 415. The reinforcing portion 450 is bent by the shell assembly 410 and is wavy in shape. The shell assembly 410 is connected to the bottom plate of the box body 430 through the reinforcing portion 450, and the second surface 423 of the battery cell group 420 near the second opening 415 is bonded to the heat exchange plate through a thermally conductive structural adhesive.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body having a bottom plate for carrying a battery cell assembly; The battery cell assembly includes a housing assembly, the housing assembly includes a first housing and a second housing, the first housing has a first opening and a second opening facing different directions, the second housing is disposed at the first opening and forms a receiving cavity together with the first housing, and A battery cell group is arranged in the accommodating cavity, wherein the battery cell group includes at least one soft-pack battery cell, and at least one surface of the soft-pack battery cell is bonded to the box body through the second opening; The battery cell group has two first surfaces opposite to each other along the thickness direction of the soft-pack battery cell, the two first surfaces are both connected to the shell assembly, and one of the two first surfaces faces the first opening.

2. The battery device according to claim 1, characterized in that: The battery cell group further comprises two second surfaces opposite to each other along the width direction of the soft-pack battery cell, and the two second surfaces are arranged between the two first surfaces at intervals; The first housing includes a first fixing portion and a second fixing portion, wherein the first fixing portion covers at least a portion of one of the first surfaces along a thickness direction of the soft-pack battery cell, and the second fixing portion is connected to one side of the first fixing portion along a thickness direction of the soft-pack battery cell, and the second fixing portion covers at least a portion of the second surface along a width direction of the soft-pack battery cell; The second housing includes a third fixing portion, which is disposed on a side of the second fixing portion away from the first fixing portion and covers at least a portion of the other first surface along a thickness direction of the soft-pack battery cell.

3. The battery device according to claim 2, characterized in that: The second shell further includes a fourth fixing portion, which is connected to one side of the third fixing portion along the width direction of the soft-pack battery cell and is butt-jointed with the second fixing portion to jointly cover the second surface of the battery cell group.

4. The battery device according to claim 3, characterized in that: The butt joint position between the second fixing portion and the fourth fixing portion is located at the midpoint of a line connecting the two first surfaces.

5. The battery device according to claim 2, characterized in that: The first shell also includes a fifth fixing portion, which is connected to a side of the second fixing portion away from the first fixing portion, and is butted with the third fixing portion along the width direction of the soft-pack battery cell, and together with the third fixing portion covers another first surface along the thickness direction of the soft-pack battery cell.

6. The battery device according to claim 5, characterized in that: The butt joint position between the third fixing portion and the fifth fixing portion is located in the middle of the width of the soft-pack battery cell.

7. The battery device according to any one of claims 1 to 6, characterized in that: The soft-pack battery cell comprises a shell and an electrode assembly, wherein the shell wraps the electrode assembly; The electrode assembly is formed by winding or stacking pole pieces.

8. The battery device according to any one of claims 1 to 6, characterized in that: The battery cell assembly includes a plurality of shell assemblies, which are arranged in sequence along the thickness direction of the soft-pack battery cell, and the battery cell group is disposed in the accommodating cavity of each shell assembly.

9. The battery device according to claim 8, characterized in that: At least two adjacent shell components share a portion of the shell.

10. The battery device according to claim 9, characterized in that: The soft-pack battery cell comprises two third surfaces disposed opposite to each other and two fourth surfaces disposed opposite to each other, wherein the surface area of ​​the third surface is greater than that of the fourth surface; The third surfaces of the soft-pack battery cells on both sides of the same accommodating cavity form the first surface of the battery cell group; All the fourth surfaces located in the same accommodating cavity together form the second surface of the battery cell group; For any two adjacent shell assemblies, a portion of the first shell of one covering the first surface along the thickness direction of the soft-pack battery cell and a portion of the second shell of the other covering the first surface along the thickness direction of the soft-pack battery cell share a common shell.

11. The battery device according to claim 10, characterized in that: The third surface and the fourth surface of any one of the soft-pack battery cells are connected via a transition portion.

12. The battery device according to claim 11, characterized in that: The transition portion is an R angle.

13. The battery device according to claim 12, characterized in that: A glue blocking structure is provided between the R corners of any two adjacent soft-pack battery cells located in the same accommodating cavity, and the glue blocking structure is connected to the bottom of the box body.

14. The battery device according to claim 13, characterized in that: The glue blocking structure is a glue blocking strip.

15. The battery device according to claim 10, characterized in that: It also includes an adhesive, the battery cell group includes a plurality of the soft-pack battery cells, and the third surfaces of the plurality of the soft-pack battery cells, and the third surface and the shell assembly are connected to each other through the adhesive.

16. The battery device according to claim 8, characterized in that The first opening is disposed on one side of the soft-pack battery cell in a thickness direction, and the second opening is disposed on one side of the soft-pack battery cell in a width direction.

17. The battery device according to claim 16, characterized in that: Along the thickness direction of the soft-pack battery cell, the second openings of any two adjacent shell components face opposite directions.

18. The battery device according to any one of claims 1 to 6, characterized in that: The material of the housing component is metal or plastic.

19. The battery device according to any one of claims 1 to 6, 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.

20. The battery device according to any one of claims 1 to 6, characterized in that: The second opening is communicated with the accommodating cavity, a reinforcing portion is provided at a position of the shell component close to the second opening, and the shell component is connected to the bottom plate through the reinforcing portion.

21. The battery device according to claim 20, characterized in that The bottom plate is provided with a slot, and the reinforcement part is plugged into the slot.

22. The battery device according to claim 21, characterized in that The battery device further comprises a heat-conductive structural adhesive, and a side of the soft-pack battery cell close to the second opening is bonded to the bottom plate by the heat-conductive structural adhesive.

23. The battery device according to claim 22, characterized in that The bottom plate is a heat exchange plate, and the soft-pack battery cells are bonded to the heat exchange plate through the heat-conducting structural adhesive.

24. The battery device according to claim 20, characterized in that The reinforcement portion is formed by bending a shell of the shell assembly.

25. The battery device according to claim 24, characterized in that The reinforcement portion is wave-shaped.

26. The battery device according to claim 20, characterized in that The reinforcement portion is formed by locally thickening the shell of the shell assembly.

27. The battery device according to any one of claims 1 to 6, characterized in that The battery device further includes an expansion beam connected to the bottom plate, and the housing assembly abuts against the expansion beam along the thickness direction of the soft-pack battery cell.

28. An electrical device, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 27.

29. The electrical device according to claim 28, characterized in that: The electric device comprises a vehicle, the vehicle comprises a floor, the box comprises a second opening, and the floor covers the second opening.

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