Battery device and electric device

Abstract

A battery device and an electric device. The battery device comprises a case. A battery cell assembly comprises a housing assembly and a battery cell group. The housing assembly comprises a first housing and a second housing, wherein the first housing is provided with a first opening and a second opening which face different directions, and the second housing is arranged at the first opening and, together with the first housing, forms an accommodating cavity. The battery cell group is arranged in the accommodating cavity. The battery cell group has two first surfaces opposite each other in the thickness direction of a pouch battery cell; both first surfaces are connected to the housing assembly, and one of the two first surfaces directly faces the first opening. The side of the pouch battery cell close to the second opening is adhered to the case. In the described technical solution, the battery cell group being assembled into the housing through an opening structure can improve both the assembly accuracy of the pouch battery cell and the assembly efficiency of the pouch battery cell.

Description

Battery devices and electrical appliances Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. The reliability of power batteries has a significant impact on the vehicle's range and power performance. Therefore, improving battery reliability is a key research direction for continuous battery improvement and innovation. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device that can effectively improve the reliability of the internal soft-pack battery cell assembly, thereby improving the reliability of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, comprising: a housing having a base plate for supporting a battery cell assembly; the battery cell assembly including a housing assembly and a cell assembly, the housing assembly including a first housing and a second housing, the first housing having a first opening and a second opening facing different directions, the second housing being disposed at the first opening and forming a receiving cavity together with the first housing; the cell assembly being disposed in the receiving cavity, the cell assembly including at least one pouch battery cell, at least one surface of the pouch battery cell being bonded to the housing through the second opening; the cell assembly having two first surfaces opposite each other along the thickness direction of the pouch battery cell, both first surfaces being connected to the housing assembly, and one of the two first surfaces facing the first opening.

[0005] In the above technical solution, since the housing assembly is divided into a first housing and a second housing, and the first housing has a first opening and a second opening facing different directions, when the battery cell assembly is installed into the housing, the battery cell assembly enters the housing through the first opening along the thickness direction of the pouch battery cell. Compared to a solution where the first and second housings are integrally set, and the housing is prone to deformation when the battery cell assembly enters the housing, the first and second housings are detachably fitted, making it less likely for either to deform during the battery cell assembly's entry. Therefore, this structure is more stable and improves the reliability of the battery device. Furthermore, since the first opening faces the first surface of the battery cell assembly along its thickness direction, the first opening is opposite to the larger surface of the battery cell assembly, reducing the obstruction of the larger surface of the battery cell assembly during entry into the housing, further improving the reliability of the battery device.

[0006] In some embodiments, the cell assembly has two second surfaces opposite each other along the width direction of the pouch cell, the two second surfaces being spaced apart between two first surfaces. The first housing 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 pouch cell. The second fixing portion is connected to one side of the first fixing portion along the thickness direction of the pouch cell and covers at least a portion of the second surface of the cell assembly along the width direction of the pouch cell. The second housing includes a third fixing portion. The third fixing portion is disposed on the 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 pouch cell.

[0007] In the above technical solution, the first fixing part of the first housing covers at least a portion of a first surface of the cell assembly, the second fixing part covers at least a portion of the second surface, and the third fixing part of the second housing covers at least a portion of the other first surface. Through the detachable engagement of the first housing and the second housing, the housing is less likely to deform when the cell assembly is inserted into the housing, and the housing is less likely to be pried open, thereby improving assembly accuracy and assembly efficiency. At the same time, the first fixing part, the second fixing part, and the third fixing part can provide support and protection for the cell assembly from the thickness and width directions of the soft-pack battery cell, thereby improving the overall strength of the cell assembly.

[0008] In some embodiments, the second housing further includes a fourth fixing part, which is connected to one side of the third fixing part along the width direction of the soft-pack battery cell and is disposed in conjunction with the second fixing part, and together they cover the second surface of the cell assembly.

[0009] In the above technical solution, the fourth fixing part of the second housing is connected to the second fixing part and together cover the second surface of the cell assembly, which can strengthen the constraint of the cell assembly along the width direction of the soft-pack battery cell and improve the vibration and shock resistance of the soft-pack battery cell.

[0010] In some embodiments, the mating position of the second fixing part and the fourth fixing part is located at the midpoint of the 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 shock resistance of the cell pack along the width direction of the soft pack battery cell.

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

[0013] In the above technical solution, the first fixing part covers at least a portion of one first surface of the cell assembly, the fifth fixing part covers a portion of another first surface of the cell assembly, the second fixing part covers the second surface, and the first fixing part and the fifth fixing part are connected as a whole, which can strengthen the fixing effect on the entire cell assembly. At the same time, the fifth fixing part has a pre-positioning function for the entire cell assembly after it is installed in the casing, which can reduce the occurrence of the cell assembly's position shifting along the thickness direction of the soft-pack battery cell. The third fixing part and the fifth fixing part are connected and arranged along the width direction of the soft-pack battery cell, ensuring that there is sufficient coverage area on the other first surface of the cell assembly, which is beneficial for fixing the cell assembly, improving the cell assembly's resistance to vibration and impact, and improving the reliability of the soft-pack battery cell.

[0014] In some embodiments, the mating position of the third fixing part and the fifth fixing part is located at 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 casing processing and simplify the processing technology. Moreover, the two together cover the first surface of the cell assembly, which can improve the constraint force on the cell assembly along the thickness direction of the soft pack battery cell. At the same time, it can also prevent the first surface of the cell assembly from being exposed, which can reduce the risk of damage to the soft pack battery cell caused by the entry of external foreign objects.

[0016] In some embodiments, a pouch cell includes a housing and an electrode assembly, the housing enclosing the electrode assembly, and the electrode assembly being formed by winding or stacking electrode sheets.

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

[0018] In some embodiments, the battery cell assembly includes multiple housing assemblies arranged sequentially along the thickness direction of the pouch battery cell, and each housing assembly contains a cell assembly within its cavity.

[0019] In the above technical solution, the battery cell assembly includes multiple housing assemblies, and each housing assembly has a cell group in its receiving cavity, which can further improve the assembly efficiency of the battery cell assembly. At the same time, adjacent cell groups are respectively housed in the receiving cavities of different housing assemblies. When one cell group experiences thermal runaway, the housing assembly can prevent the thermal runaway from spreading to adjacent cell groups, reducing the risk of thermal diffusion in the battery cell assembly.

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

[0021] In the above technical solution, at least some of the two adjacent housing components share a portion of the housing, which can save materials and reduce production costs. At the same time, sharing the housing can reduce the space occupied by the housing components in the battery box, increase the battery energy density, and also help improve the assembly efficiency of the battery cell components.

[0022] In some embodiments, a pouch cell includes two oppositely arranged third surfaces and two oppositely arranged fourth surfaces, the surface area of ​​the third surfaces being larger than that of the fourth surfaces. The third surfaces of the pouch cells located on both sides within the same receiving cavity form the first surface of the cell assembly, and the fourth surfaces of all the pouch cells located within the same receiving cavity together form the second surface of the cell assembly. For any two adjacent housing assemblies, the portion of the first housing of one of them covering the first surface of the corresponding cell assembly along the thickness direction of the pouch cell shares the housing with the portion of the second housing of the other of it covering the first surface of the corresponding cell assembly along the thickness direction of the pouch cell.

[0023] In the above technical solution, for any two adjacent housing components, the portion of the first housing of one of them covering the first surface of the cell group in its corresponding receiving cavity and the portion of the second housing of the other covering the first surface of the cell group in its corresponding receiving cavity share the same housing. This can reduce the space occupied by the housing components, improve the grouping efficiency, and improve the assembly accuracy of the cell group.

[0024] In some embodiments, the third and fourth surfaces of any pouch cell are connected by a transition portion.

[0025] In the above technical solution, the third and fourth surfaces of any pouch cell are connected by a transition section, which can increase the connection strength and reduce the risk of cracking of the pouch cell casing.

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

[0027] In the above technical solution, the transition part is an R-angle, which is beneficial to the processing and manufacturing of the soft-pack battery cell shell, improves the shell's resistance to cracking, and can improve the production efficiency of the soft-pack battery cell.

[0028] In some embodiments, a baffle structure is provided between the R-angles of any two adjacent pouch cell cells located in the same receiving cavity, and the baffle structure is provided at the bottom of the housing.

[0029] In the above technical solution, a baffle structure is provided between the R-corners of any two adjacent soft-pack battery cells in the same housing cavity. This can prevent glue from overflowing to the R-corners when the soft-pack battery cells are bonded to the housing, thereby reducing the risk of stress concentration at the R-corners of the soft-pack battery cells.

[0030] In some embodiments, the adhesive-blocking structure is an adhesive-blocking strip.

[0031] In the above technical solution, the adhesive-blocking structure is an adhesive-blocking strip, which can be directly glued to the bottom of the box. It has a simple structure, is easy to install, and has high reliability.

[0032] In some embodiments, the battery device further includes an adhesive, the cell assembly includes a plurality of pouch cell units, and the third surfaces of the plurality of pouch cell units are connected to each other and to the housing assembly by an adhesive.

[0033] In the above technical solution, the battery device includes an adhesive, and the cell assembly includes multiple pouch battery cells. The third surfaces of the multiple pouch battery cells are connected to each other and to the housing assembly through the adhesive, which can connect the multiple pouch battery cells and the housing assembly into a whole, improve the vibration and shock resistance of the individual pouch battery cells, and reduce the risk of deformation and damage to the pouch battery cells.

[0034] In some embodiments, the first opening is disposed on one side of the thickness direction of the pouch cell, and the second opening is disposed on one side of the width direction of the pouch cell.

[0035] In the above technical solution, the first housing includes a first opening along the thickness direction of the soft-pack battery cell and a second opening along the width direction. The soft-pack battery cell can be installed in the housing through the first opening without deforming the housing, which is beneficial to improving assembly efficiency. After installation, it can be bonded to the casing through the second opening, which is beneficial to improving the positional stability of the cell assembly.

[0036] In some embodiments, along the thickness direction of the pouch cell, the second openings of any two adjacent housing assemblies 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 housing components face opposite directions. When a soft-pack battery cell contained in one of the housing components experiences thermal runaway, the opposite orientation of the second openings of the housing components can prevent the thermal runaway from spreading to the cell assembly contained in the adjacent housing components, thereby reducing the risk of thermal spread.

[0038] In some embodiments, the housing assembly is made of metal or plastic.

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

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

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

[0042] In some embodiments, the soft-pack battery cell is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(1-3):(1-3); the soft-pack battery cell is a ternary battery cell, and the ratio of the amount of the amount of positive active material, binder and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(2-3):(1-2).

[0043] In the above technical solutions, when the pouch battery cell 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 within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device, allowing the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for binder and conductive agent dosages can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch battery cell is a ternary lithium battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps ensure good adhesion between positive electrode active material particles and between the active material and the current collector. This improves the mechanical stability and integrity of the electrode assembly, reduces the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device.

[0044] In some embodiments, the second opening communicates with the receiving cavity, and the housing assembly is provided with a reinforcing portion near the second opening, and the housing assembly is connected to the base plate through the reinforcing portion.

[0045] In the above technical solution, the first housing includes a second opening, which communicates with the receiving cavity. A reinforcing part is provided near the second opening of the housing assembly. The housing assembly is connected to the base plate through the reinforcing part, which allows the housing assembly to be connected to the battery pack housing as a whole. This can further improve the vibration and shock resistance of the soft-pack battery cells and reduce the risk of deformation and displacement of the soft-pack battery cells. At the same time, the reinforcing part can improve the strength of the housing assembly, making the housing assembly less prone to deformation and providing better protection for the battery cell pack.

[0046] In some embodiments, the base plate is provided with a slot, and the reinforcement is inserted into the slot.

[0047] In the above technical solution, the bottom plate is provided with a slot, and the reinforcing part is inserted into the slot, which can improve the connection strength between the shell assembly and the bottom plate of the box. It is not easy to separate from the box when subjected to vibration and impact, and the impact force can be distributed to the entire box, so that the stress is even and the shell assembly is not easily deformed. At the same time, the reinforcing 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 conducive to saving box space and improving space utilization.

[0048] In some embodiments, the battery device further includes a thermally conductive structural adhesive, which is used to bond the side of the pouch cell near the second opening to the base plate.

[0049] In the above technical solution, the battery device includes a thermally conductive structural adhesive. The side of the soft-pack battery cell near the second opening is bonded to the base plate with the thermally conductive structural adhesive. Based on the reinforcement of the housing assembly being fixed to the base plate through slots, the soft-pack battery cell is bonded to the base plate with the thermally conductive structural adhesive. This can further improve the connection strength between the battery cell assembly and the housing, reduce the risk of displacement and deformation of the soft-pack battery cell, and at the same time, the thermally conductive structural adhesive can conduct the heat generated by the soft-pack battery cell to the base plate of the housing, which helps to reduce the temperature of the soft-pack battery cell and reduce the risk of thermal runaway.

[0050] In some embodiments, the base plate is a heat exchange plate, and the soft-pack battery cells are bonded to the heat exchange plate by thermally conductive structural adhesive.

[0051] In the above technical solution, the bottom plate of the box is a heat exchange plate. The soft-pack battery cells are bonded to the heat exchange plate by thermally conductive structural adhesive. A heat exchange medium flows inside the heat exchange plate. The bonding of the soft-pack battery cells to the heat exchange plate by thermally conductive structural adhesive can improve the heat exchange efficiency and further reduce the risk of thermal runaway of the soft-pack battery cells. At the same time, the integration of the heat exchange plate function into the bottom plate can improve the space utilization of the box.

[0052] In some embodiments, the reinforcement is formed by bending the housing assembly.

[0053] In the above technical solution, the reinforcing part is formed by bending the shell of the shell assembly. The reinforcing part is integrally formed with the shell assembly, which helps to simplify the processing technology, improve the production cycle, and does not introduce new parts, thus helping to reduce production and manufacturing costs.

[0054] In some embodiments, the reinforcing part is wavy.

[0055] In the above technical solution, the reinforcing part is set in a wave shape, which can further improve the shell strength of the shell assembly, and the fixing part is not easily deformed. It can provide stable support and protection for the cell assembly and reduce the risk of deformation and displacement of the soft-pack battery cells.

[0056] In some embodiments, the reinforcement is formed by locally thickening the housing of the housing assembly.

[0057] In the above technical solution, the reinforcing part is formed by locally thickening the shell of the shell assembly, which can reduce the processing difficulty of the reinforcing part, facilitate production and manufacturing, and improve production efficiency.

[0058] In some embodiments, the battery device further includes an expansion beam connected to the base plate, and the housing assembly abuts against the expansion beam along the thickness direction of the pouch cell.

[0059] In the above technical solution, the battery device also includes an expansion beam connected to the base plate. The housing assembly abuts against the expansion beam along the thickness direction of the soft-pack battery cell. This can reduce the number of internal components of the housing, improve the utilization rate of the internal space of the housing, accommodate more battery cell assemblies, and help increase the capacity of the battery device. Furthermore, the expansion beam abuts against the housing 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 to the housing assembly.

[0060] Secondly, the application provides an electrical device, including a battery device according to the first aspect of this application.

[0061] In the above embodiments, by providing a battery device according to the first aspect, the battery cell assembly includes a housing assembly and a cell group. The housing assembly can accommodate the cell group within the housing, reducing the range of movement and deformation of each pouch cell in the cell group, improving the positional stability of the pouch cell within the battery device, and reducing the risk of movement of the pouch cell due to vibration and impact, which could lead to leakage or short circuit. Furthermore, 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. When the cell group is assembled into the housing, it enters through the first opening without deforming the first housing, improving the assembly accuracy of the cell group. After assembly, the second housing and the first housing cooperate to constrain the cell group, providing protection. Simultaneously, it can be bonded to the casing through the second opening, further improving the positional stability of the cell group. In addition, the housing assembly can also disperse external impact forces, reducing the probability of a single pouch cell bearing excessive impact, increasing the lifespan of the pouch cell, and extending the lifespan of the battery device, thereby improving the overall performance of the electrical device.

[0062] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the housing includes a second opening, and the floor covers the second opening.

[0063] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box includes a second opening, the floor covers the second opening, and the battery device box uses the vehicle's own floor as a box cover for sealing, which can reduce costs, improve space utilization, increase the box capacity, and increase the vehicle chassis height.

[0064] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0065] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of this application;

[0066] Figure 2 is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0067] Figure 3 is a schematic diagram of the structure of a battery cell assembly according to some embodiments of this application;

[0068] Figure 4 is a schematic diagram of the structure of a battery device according to some other embodiments of this application;

[0069] Figure 5 is a schematic diagram of the structure of a battery device according to some embodiments of the present application;

[0070] Figure 6 is an exploded view of the battery cell assembly shown in Figure 3;

[0071] Figure 7 is an exploded view of the battery cell assembly shown in Figure 4;

[0072] Reference numerals: 1. Electrical device; 100. Battery device; 200. Controller; 300. Motor; 400. Battery cell assembly; 410. Housing assembly; 411. First housing; 412. Second housing; 413. First opening; 414. Receiving cavity; 420. Cell assembly; 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. Adhesive-proof structure; 415. Second opening; 430. Housing; 440. Second opening; 450. Reinforcing part; X. Thickness direction of the soft-pack battery cell; Y. Width direction of the soft-pack battery cell. Detailed Implementation

[0073] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0075] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0076] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0077] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0078] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0079] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0080] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0081] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0082] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0083] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0084] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0085] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0086] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0087] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0088] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0089] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0090] The battery cells mentioned in the embodiments of this 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., and the embodiments of this application are not limited thereto. The battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0091] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0092] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0093] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0094] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0095] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery packs and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0096] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0097] Because the soft-pack battery cells use an aluminum-plastic film to wrap the electrode components and electrolyte, the aluminum-plastic film is lightweight, which can significantly reduce the weight of the battery device and increase the energy density of the battery device.

[0098] However, in related technologies, when using pouch cell batteries, the pouch cells inside the casing are prone to deformation due to their low structural strength and insufficient resistance to external impacts, and their installation accuracy and assembly efficiency are also low.

[0099] Based on the above considerations, in order to improve the deformation resistance of pouch battery cells, increase the assembly efficiency and precision of pouch battery cell packs, this application designs a battery device. The housing assembly of the battery device is divided into two parts: a first housing and a second housing. The first housing has a first opening and a second opening facing different directions. When the cell pack is assembled into the housing, the two first surfaces of the cell pack along the thickness direction of the pouch battery cell enter the housing through the first opening, without deforming the housing, which can improve the assembly precision of the pouch battery cell. After the assembly is completed, one of the first surfaces of the cell pack faces the first opening, and the second housing is set on one side of the first opening and cooperates with the first housing to fix the entire cell pack. At the same time, at least one surface of the pouch battery cell can be bonded to the housing through the second opening, which can improve the bonding force between the pouch battery cell and the battery housing, and at the same time improve the packing efficiency of the pouch battery cells.

[0100] This application provides an electrical device that uses the battery pack or battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0101] For ease of explanation, the following embodiments use a vehicle as an example to describe in detail the structure of the electrical device, battery device, and battery cell assembly of this application.

[0102] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 1 as a vehicle according to some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving. In some embodiments of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0103] Please refer to Figure 2, which is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 430 and a battery cell assembly 400. The housing 430 provides assembly space for the battery cell assembly 400, and the battery cell assembly 400 is housed within the housing 430.

[0104] The battery cell assembly 400 according to an embodiment of the first aspect of this application is described below with reference to Figures 3-7. Figure 3 is a structural schematic diagram of the battery cell assembly 400 according to some embodiments of this application; Figure 4 is a structural schematic diagram of the battery cell assembly 400 according to other embodiments of this application; Figure 5 is a structural schematic diagram of the battery cell assembly 400 according to yet another embodiment of this application; Figure 6 is an exploded view of the battery cell assembly 400 shown in Figure 3; and Figure 7 is an exploded view of the battery cell assembly 400 shown in Figure 4.

[0105] This application provides a battery device 100, including a battery cell assembly 400 and a housing 430, with a base plate for supporting the battery cell assembly 400, as shown in FIG3. The battery cell assembly 400 includes a housing assembly 410 and a cell assembly 420. The housing assembly 410 includes a first housing 411 and a second housing 412. The first housing 411 has a first opening 413 and a second opening 415 facing different directions. The second housing 412 is disposed at the first opening 413 and is adjacent to the first opening 415. The housing 411 together form a receiving cavity 414, and the cell assembly 420 is disposed in the receiving cavity 414. The cell assembly 420 includes at least one pouch cell 4201. At least one surface of the pouch cell 4201 is bonded to the housing 430 through a second opening 415. The cell assembly 420 has two first surfaces 422 opposite to each other along the thickness direction X of the pouch cell. Both first surfaces 422 are connected to the housing assembly 410, and one of the two first surfaces 422 faces the first opening 413.

[0106] In some embodiments, the housing assembly 410 is U-shaped, the first housing 411 is L-shaped, and the second housing 412 is I-shaped. The first housing 411 and the second housing 412 cooperate to form a receiving cavity 414 to house the battery cell assembly 420.

[0107] The first housing 411 having a first opening 413 and a second opening 415 facing different directions means that the first housing 411 has 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.

[0108] The cell pack 420 includes at least one soft-pack battery cell 4201, which is assembled with the first housing 411 through a first opening 413 structure.

[0109] The second housing 412 is located at the first opening 413. This means that after the cell assembly 420 is assembled into the housing, the second housing 412 is located at the first opening 413 on the side of the thickness direction X of the soft-pack battery cell of the first housing 411. Together with the first housing 411, they form a receiving cavity 414 to protect the cell assembly 420.

[0110] The first surface 422 refers to the surface of the cell assembly 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 of the thickness direction X of the soft-pack battery cell.

[0111] The fact that both first surfaces 422 are connected to the housing assembly 410 means that the cell assembly 420 and the housing assembly 410 are connected as a whole, which can improve the impact deformation resistance of the soft-pack battery cell 4201.

[0112] One of the two first surfaces 422 facing the first opening 413 means that after the cell assembly 420 is installed into the casing along the thickness direction X of the soft-pack battery cell, one of the first surfaces 422 is covered by the first casing 411, and the other first surface 422 faces the first opening 413 of the first casing 411 along the thickness direction X of the soft-pack battery cell and is covered by the second casing 412.

[0113] In this embodiment, the housing assembly 410 is divided into two parts: a first housing 411 and a second housing 412. The first housing 411 has a first opening 413 and a second opening 415 facing different directions. When the cell assembly 420 is installed into the housing, the cell assembly 420 enters the housing through the first opening 413 along the thickness direction X of the soft-pack battery cell. Compared to a design where the first housing 411 and the second housing 412 are integrally formed, and the housing is prone to deformation when the cell assembly 420 enters the housing, the detachable fit of the first housing 411 and the second housing 412 makes it less likely for either to deform during the installation of the cell assembly 420. Therefore, the structure is more stable and the reliability of the battery device 100 is improved. In addition, since the first opening 413 faces the cell assembly 420 along the thickness direction X, the first opening 411 is more stable and the second housing 412 is more stable. The first surface 422 in the degree direction makes the first opening face the larger surface of the soft-pack battery cell 4201, which can reduce the obstruction of the cell assembly 420 during the casing process, further improve the reliability of the battery device 100, and improve the assembly accuracy of the soft-pack battery cell 4201. After the casing assembly is completed, one of the first surfaces 422 of the cell assembly 420 faces the first opening 413, and the second housing 412 is disposed on one side of the first opening 413 and cooperates with the first housing 411 to fix the entire cell assembly 420. At the same time, at least one surface of the soft-pack battery cell 4201 can be bonded to the housing 430 through the second opening 415, which can improve the bonding force between the soft-pack battery cell 4201 and the housing 430, and at the same time improve the assembly efficiency of the soft-pack battery cell 4201.

[0114] In some embodiments of this application, the cell assembly 420 has two second surfaces 423 opposite each other along the width direction Y of the pouch cell, the two second surfaces 423 being spaced apart between two first surfaces 422, the first housing 411 including a first fixing part 4111 and a second fixing part 4112, the first fixing part 4111 covering at least a portion of one of the first surfaces 422 along the thickness direction X of the pouch cell, the second fixing part 4112 being connected to one side of the first fixing part 4111 along the thickness direction X of the pouch cell, and covering at least a portion of the second surface 423 of the cell assembly 420 along the width direction Y of the pouch cell, the second housing 412 including a third fixing part 4121, the third fixing part 4121 being disposed on the side of the second fixing part 4112 away from the first fixing part 4111, and covering at least a portion of the other first surface 422 along the thickness direction X of the pouch cell.

[0115] The first housing 411 includes a first fixing part 4111 and a second fixing part 4112 connected to each other. The first fixing part 4111 has a plate-like structure and covers at least a portion of a first surface 422 of the cell assembly 420 along the thickness direction X of the soft-pack battery cell. The second fixing part 4112 has a plate-like structure and covers at least a portion of a second surface 423 of the cell assembly 420 along the width direction of the soft-pack battery cell 4201, forming an "L"-shaped housing structure.

[0116] The third fixing part 4121 of the second housing 412 is arranged opposite to the first fixing part 4111 along the thickness direction X of the soft-pack battery cell to form an "I" shaped housing structure. The third fixing part 4121 has a plate-like structure and covers at least part of the other first surface 422.

[0117] The first housing 411 and the second housing 412 work together to protect the cell assembly 420, reducing the risk of deformation or displacement of the soft-pack battery cell 4201, thereby reducing the possibility of leakage or short circuit of the soft-pack battery cell 4201.

[0118] In this embodiment, the first fixing part 4111 of the first housing 411 covers at least a portion of a first surface 422 of the cell assembly 420, the second fixing part 4112 covers at least a portion of a second surface 423, and the third fixing part 4121 of the second housing 412 covers at least a portion of another first surface 422. Through the detachable engagement of the first housing 411 and the second housing 412, the housing is less prone to deformation and expansion when the cell assembly 420 is inserted, thus improving assembly accuracy and efficiency. At the same time, the first fixing part 4111, the second fixing part 4112, and the third fixing part 4121 can provide support and protection for the cell assembly 420 from the thickness direction X and the width direction of the soft-pack battery cell, thereby improving the overall strength of the cell assembly 420.

[0119] In some embodiments of this application, referring to FIG4, the second housing 412 further includes a fourth fixing part 4122, which is connected to the third fixing part 4121 on one side along the width direction Y of the soft-pack battery cell and is disposed in conjunction with the second fixing part 4112, and together they cover the second surface 423 of the cell assembly 420.

[0120] The fourth fixing part 4122 has a plate-like structure and is disposed with the second fixing part 4112 along the thickness direction X of the soft pack battery cell. There may be a gap between the first fixing part 4111 and the second fixing part 4112, or they may be in contact with each other.

[0121] The fourth fixing part 4122 works in conjunction with the second fixing part 4112 to provide protection for the cell assembly 420, reducing the risk of the cell assembly 420 shifting along the width direction of the soft-pack battery cell 4201 due to vibration and impact, and reducing the possibility of short circuit leakage in the soft-pack battery cell 4201.

[0122] In this embodiment, the fourth fixing part 4122 of the second housing 412 is connected to the second fixing part 4112 to jointly cover the second surface 423 of the cell assembly 420. This can strengthen the constraint of the cell assembly 420 along the width direction of the soft-pack battery cell 4201 and improve the vibration and shock resistance of the soft-pack battery cell 4201.

[0123] In some embodiments of this application, the docking position of the second fixing part 4112 and the fourth fixing part 4122 is located at the midpoint of the line connecting the two first surfaces 422.

[0124] The docking position of the second fixing part 4112 and the fourth fixing part 4122 is located at the midpoint of the line connecting the two first surfaces 422, meaning that the second fixing part 4112 and the fourth fixing part 4122 completely cover the second surface 423 of the cell assembly 420, with no gap between them, and the second fixing part 4112 and the fourth fixing part 4122 each cover half of the second surface 423.

[0125] In this embodiment, the docking position of the second fixing part 4112 and the fourth fixing part 4122 is located at the midpoint of the line connecting the two first surfaces 422. This ensures that the second fixing part 4112 and the fourth fixing part 4122 completely cover the second surface 423, further improving the vibration and shock resistance of the cell pack 420 along the width direction Y of the soft-pack battery cell.

[0126] In some embodiments of this application, referring to FIG5, the first housing 411 further includes a fifth fixing part 4113. The fifth fixing part 4113 is connected to the side of the second fixing part 4112 away from the first fixing part 4111, and is disposed with the third fixing part 4121 along the width direction Y of the soft pack battery cell, and together with the third fixing part 4121 along the thickness direction X of the soft pack battery cell, they cover another first surface 422.

[0127] The pouch cell 4201 includes two opposing third surfaces 4211 and two fourth surfaces 4212. The surface area of ​​the third surfaces 4211 is larger than that of the fourth surfaces 4212. The third surfaces 4211 are two opposing surfaces along the thickness direction X of the pouch cell, and are the surfaces with the largest surface area. The fourth surfaces 4212 are two opposing surfaces along the width direction Y of the pouch cell. The third surfaces 4211 and fourth surfaces 4212 can be connected by a radius (R-angle). The third surfaces 4211 of the pouch cell 4201 located at the end of the cell assembly 420 form the two first surfaces 422 of the cell assembly 420. The fourth surfaces 4212 of each pouch cell 4201 together form the second surface 423 of the cell assembly 420.

[0128] The fifth fixing part 4113 has a plate-like structure and extends along the width direction Y of the soft-pack battery cell to cover the R-angle of the end of the soft-pack battery cell 4201 near the first opening 413 of the cell assembly 420, or it can continue to extend to the third surface 4211. When the soft-pack battery cell 4201 is inserted into the shell for assembly, there is no need to deform the shell assembly 410, which can improve the assembly accuracy. After the cell assembly 420 is formed after assembly, the first fixing part 4111 and the fifth fixing part 4113 can pre-position the cell assembly 420 along the thickness direction X of the soft-pack battery cell, reducing the risk of displacement of the soft-pack battery cell 4201.

[0129] The third fixing part 4121 and the fifth fixing part 4113 are disposed together along the width direction Y of the soft-pack battery cell. The third fixing part 4121 can cover the third surface 4211 of the end soft-pack battery cell 4201 and the other R angle opposite along the width direction Y of the soft-pack battery cell to ensure sufficient coverage area for the first surface 422 of the cell assembly 420 near the first opening 413, reducing the risk of displacement of the cell assembly 420. When subjected to impact along the thickness direction X of the soft-pack battery cell, the third fixing part 4121 and the fifth fixing part 4113 can resist the impact and reduce the risk of deformation of the soft-pack battery cell 4201.

[0130] In the above embodiment, the first fixing part 4111 covers at least a portion of one first surface 422 of the cell assembly 420, the fifth fixing part 4113 covers a portion of the other first surface 422 of the cell assembly 420, and the second fixing part 4112 covers the second surface 423. The first fixing part 4111 and the fifth fixing part 4113 are connected into a whole, which can strengthen the fixing effect of the entire cell assembly 420. At the same time, the fifth fixing part 4113 has a pre-positioning effect on the entire cell assembly 420 after it is installed in the casing, which can reduce the occurrence of the position of the cell assembly 420 shifting along the thickness direction X of the soft-pack battery cell. The third fixing part 4121 and the fifth fixing part 4113 are connected along the width direction Y of the soft-pack battery cell, ensuring that there is sufficient coverage area for the other first surface 422 of the cell assembly 420, which is beneficial for fixing the cell assembly 420, improving the vibration and shock resistance of the cell assembly 420, and improving the reliability of the soft-pack battery cell 4201.

[0131] In some embodiments of this application, the docking position of the third fixing part 4121 and the fifth fixing part 4113 is located at the middle of the width of the soft-pack battery cell 4201.

[0132] The third fixing part 4121 and the fifth fixing part 4113 are connected along the width direction Y of the soft-pack battery cell. The connection position is located in the middle of the first surface 422 of the cell assembly 420, ensuring that there is no gap between the third fixing part 4121 and the fifth fixing part 4113. This completely covers the first surface 422 of the cell assembly 420 near the first opening 413, which can strengthen the protection of the cell assembly 420 and reduce the risk of deformation of the soft-pack battery cell 4201 due to external impact.

[0133] In the above embodiment, the docking position of the third fixing part 4121 and the fifth fixing part 4113 is located at the middle of the width of the soft-pack battery cell 4201. The third fixing part 4121 extends to the middle of the first surface 422. After the soft-pack battery cell 4201 is installed in the casing, the cell assembly 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. Both parts together cover the first surface 422 of the cell assembly 420, which increases the constraint force on the cell assembly 420 along the thickness direction X of the soft-pack battery cell. At the same time, it can prevent the first surface 422 of the cell assembly 420 from being exposed, which can reduce the risk of damage to the soft-pack battery cell 4201 caused by the entry of external foreign objects.

[0134] In some embodiments of this application, the pouch cell 4201 includes a housing and an electrode assembly, the housing encapsulating the electrode assembly, and the electrode assembly being formed by winding or stacking electrode sheets.

[0135] The outer casing of the soft-pack battery cell 4201 can be an aluminum-plastic film, and the electrode assembly includes a positive electrode, a negative electrode, and a separator arranged in layers.

[0136] Electrode assemblies can be formed by winding or stacking electrode sheets, providing more options for selecting the 4201 pouch cell. Different types of electrode assemblies can be selected according to different application scenarios, making the selection more flexible.

[0137] In some embodiments of this application, the battery cell assembly 400 includes a plurality of housing assemblies 410, which are arranged sequentially along the thickness direction X of the pouch battery cell, and each housing assembly 410 has a cell assembly 420 disposed in its receiving cavity 414.

[0138] The battery cell assembly 400 includes a plurality of housing assemblies 410 arranged sequentially along the thickness direction of the pouch battery cell 4201. Each housing assembly 410 has a cell group 420 disposed in its receiving cavity 414, which can improve the assembly efficiency of the battery cell assembly 400.

[0139] Meanwhile, multiple housing assemblies 410 form multiple receiving cavities 414 to respectively accommodate different battery cell groups 420. When one of the battery cell groups 420 experiences thermal runaway, the thermal runaway is not easily conducted to adjacent battery cell groups 420 due to the partitioning and blocking by the housing assemblies 410, which can reduce the risk of thermal propagation.

[0140] Multiple housing components 410 are interconnected 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 pouch battery cell 4201.

[0141] In the above technical solution, the battery cell assembly 400 includes multiple housing assemblies 410, and each housing assembly 410 has a cell group 420 disposed in its receiving cavity 414, which can further improve the assembly efficiency of the soft-pack battery cells 4201. At the same time, adjacent cell groups 420 are respectively housed in the receiving cavities 414 of different housing assemblies 410. When one of the cell groups 420 experiences thermal runaway, the housing assembly 410 can prevent the thermal runaway from spreading to the adjacent cell groups 420, reducing the risk of thermal diffusion in the battery cell assembly 400.

[0142] In some embodiments of this application, at least two partially adjacent housing assemblies 410 share a portion of the housing.

[0143] The battery cell assembly includes multiple housing assemblies 410 arranged sequentially along the thickness direction X of the pouch battery cell. At least some of the adjacent housing assemblies 410 share a portion of the housing, which can save materials and reduce the manufacturing cost of the housing assemblies 410. Furthermore, sharing the housing can reduce the volume of the battery cell assembly 400, reduce the space occupied by the battery device 100 housing 430, and improve the volume utilization rate of the housing 430.

[0144] In the above technical solution, at least two adjacent housing components 410 share a portion of the housing, which can save materials and reduce production costs. At the same time, sharing the housing can reduce the space occupied by the housing component 410 in the battery box 430, increase the battery energy density, and also help improve the assembly efficiency of the battery cell component 400.

[0145] In some embodiments of this application, the pouch battery cell 4201 includes two oppositely arranged third surfaces 4211 and two oppositely arranged fourth surfaces 4212. The surface area of ​​the third surfaces 4211 is larger than that of the fourth surfaces 4212. The third surfaces 4211 of the pouch battery cells 4201 on both sides within the same receiving cavity 414 form the first surface 422 of the cell assembly 420. The fourth surfaces 4212 of all the pouch battery cells 4201 within the same receiving cavity 414 together form the second surface 423 of the cell assembly 420. For any two adjacent housing assemblies 410, the portion of the first housing 411 of one of them covering the first surface 422 of the corresponding cell assembly 420 along the thickness direction X of the pouch battery cell shares the housing with the portion of the second housing 412 of the other of which covers the first surface 422 of the corresponding cell assembly 420 along the thickness direction X of the pouch battery cell.

[0146] Any two adjacent cell groups 420 are separated by two housing assemblies 410. Along the thickness direction X of the pouch cell, the first housing 411 of one housing assembly 410 covers the first surface 422 of the corresponding cell group 420, and the second housing 412 of the other housing assembly 410 covers the first surface 422 of the corresponding cell group 420. The first housing 411 of one housing assembly 410 can serve as the second housing 412 of the other housing assembly 410, and similarly, the second housing 412 of the other housing assembly 410 can serve as the first housing 411 of one housing assembly 410, so as to realize the function of sharing a housing.

[0147] In some embodiments, the housing assembly 410 corresponding to the two first surfaces 422 of any two adjacent cell groups 420 that are close to each other along the thickness direction X of the pouch cell can share a housing. For example, the first surface 422 of one cell group 420 is the surface facing the first opening 413 of the first housing 411, and the first surface 422 of the corresponding other cell group 420 can be the surface away from its corresponding first opening 413 of the first housing 411, and vice versa.

[0148] In the above technical solution, any two adjacent housing components 410, where the first housing 411 of one of them covers the portion of the first surface 422 of the cell group 420 corresponding to the receiving cavity 414 and the second housing 412 of the other of them covers the portion of the first surface 422 of the cell group 420 corresponding to the receiving cavity 414, share the same housing, which can reduce the space occupied by the housing components 410, improve the grouping efficiency, and improve the assembly accuracy of the cell group 420.

[0149] In some embodiments, the third surface 4211 and the fourth surface 4212 of any pouch cell 4201 are connected by a transition portion.

[0150] Since the outer casing of the soft-pack battery cell 4201 is usually made of aluminum-plastic film, the casing strength is insufficient. In order to reduce the risk of casing cracking during molding, the third surface 4211 and the fourth surface 4212 need to be connected by a transition part.

[0151] In the above technical solution, the third surface 4211 and the fourth surface 4212 of any soft-pack battery cell 4201 are connected through a transition portion, which can increase the connection strength and reduce the risk of cracking of the outer shell of the soft-pack battery cell 4201.

[0152] In some embodiments, the transition portion is an R-angle.

[0153] In the above technical solution, the transition part is an R-angle, which is beneficial to the processing and manufacturing of the shell of the soft-pack battery cell 4201, improves the shell's resistance to cracking, and can improve the production efficiency of the soft-pack battery cell 4201.

[0154] In some embodiments, a baffle structure 4213 is provided between the R-angles of any two adjacent pouch cell 4201 located in the same receiving cavity 414, and the baffle structure 4213 is provided at the bottom of the housing 430.

[0155] Optionally, in some embodiments, a baffle structure 4213 is provided between the R-angle of the pouch battery cells 4201 located on both sides of the thickness direction X of the pouch battery cells within the same receiving cavity 414 and the housing assembly 410.

[0156] Since the side of the pouch battery cell closest to the second opening 415 needs to be bonded to the bottom of the housing 430, in order to ensure the bonding area and avoid stress concentration in the R-corner area after the glue cures, a glue-blocking structure 4213 needs to be set between the R-corners of two adjacent pouch battery cells 4201 and between the R-corners of the pouch battery cells 4201 on both sides and the housing assembly 410 to reduce the risk of glue overflow and reduce the risk of stress concentration in the R-corner area.

[0157] The adhesive barrier structure 4213 can be a boss set at the bottom of the housing 430, or an adhesive barrier strip, etc.

[0158] In the above technical solution, a glue-blocking structure 4213 is provided between the R-corners of any two adjacent soft-pack battery cells 4201 in the same receiving cavity 414. This can prevent glue from overflowing to the R-corners when the soft-pack battery cells 4201 are bonded to the housing 430, thereby reducing the risk of stress concentration at the R-corners of the soft-pack battery cells 4201.

[0159] In some embodiments, the adhesive-blocking structure is an adhesive-blocking strip.

[0160] In the above technical solution, the adhesive barrier structure is an adhesive barrier strip, which can be directly glued to the bottom of the box 430. The structure is simple, easy to install, and highly reliable.

[0161] In some embodiments of this application, referring to Figures 6 and 7, the battery device 100 further includes an adhesive, and the cell assembly 420 includes a plurality of pouch cell 4201, the third surfaces 4211 of the plurality of pouch cell 4201 being connected to each other and to the housing assembly 410 by an adhesive.

[0162] The cell assembly 420 includes multiple pouch battery cells 4201. Each pouch battery cell 4201 includes two third surfaces 4211 arranged opposite each other along its thickness direction. The third surface 4211 is the surface with the largest surface area of ​​the pouch battery cell 4201. The third surfaces 4211 of the multiple pouch battery cells 4201 are bonded together with an adhesive to form the cell assembly 420. The cell assembly 420 and the housing assembly 410 are also bonded together with an adhesive to form a whole, making the structure of the battery cell assembly 400 more compact. The housing assembly 410 provides better fixation and protection for the pouch battery cells 4201. After the pouch battery cells 4201 are bonded together to form the cell assembly 420, they are less prone to displacement and deformation. Furthermore, after the housing assembly 410 and the cell assembly 420 are bonded together, the risk of relative displacement between the housing assembly 410 and the cell assembly 420 can be reduced, which can improve the stability of the housing assembly 410 in supporting and protecting the cell assembly 420.

[0163] When the pouch battery cell 4201 is assembled into the housing, an adhesive can be pre-applied to the third surface 4211 of each pouch battery cell 4201, and an adhesive can be pre-applied to the housing portion of the housing assembly 410 corresponding to the third surface 4211. The pouch battery cells 4201 are sequentially inserted into the housing, and the third surfaces 4211 are bonded together with each other and with the housing assembly 410 to form a whole, which can improve assembly efficiency and assembly accuracy.

[0164] In the above technical solution, the battery device 100 includes an adhesive, and the cell assembly 420 includes multiple pouch battery cells 4201. The third surfaces 4211 of the multiple pouch battery cells 4201 are connected to each other and to the housing assembly 410 by the adhesive. This allows the multiple pouch battery cells 4201 to be connected to the housing assembly 410 as a whole, improving the vibration and shock resistance of the individual pouch battery cells 4201 and reducing the risk of deformation and damage to the pouch battery cells 4201.

[0165] In some embodiments of this application, the first opening 413 is disposed on one side of the thickness direction X of the pouch battery cell, and the second opening 415 is disposed on one side of the width direction Y of the pouch battery cell.

[0166] The first housing 411 of the housing 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 on one side of the first housing 411 along the thickness direction of the pouch cell 4201 and an opening on one side along the width direction. After the cell assembly 420 is assembled into the housing, the second housing 412 covers the first opening 413 on the thickness direction side to form the final battery cell assembly 400.

[0167] In the above technical solution, the first housing 411 includes a first opening 413 along the thickness direction X of the soft-pack battery cell 4201 and a second opening 415 along the width direction. The soft-pack battery cell 4201 can be installed in the housing through the first opening 413 without deforming the housing, which is beneficial to improving the assembly efficiency. After installation, it can be bonded to the casing 430 through the second opening 415, which is beneficial to improving the positional stability of the cell assembly 420.

[0168] In some embodiments of this application, along the thickness direction X of the pouch cell, the second openings 415 of any two adjacent housing assemblies 410 face opposite directions.

[0169] The second openings 415 of the first housing 411 of any two adjacent housing assemblies 410 are oriented in opposite directions along the width direction Y of the pouch cell 4201.

[0170] In the above technical solution, along the thickness direction X of the soft-pack battery cell, the second openings 415 of any two adjacent housing components 410 face opposite directions. When the soft-pack battery cell 4201 contained in one of the housing components 410 experiences thermal runaway, the opposite orientation of the second openings 415 of the housing components 410 can prevent the thermal runaway from spreading to the cell group 420 contained in the adjacent housing components 410, thereby reducing the risk of thermal spread.

[0171] In some embodiments of this application, the housing assembly 410 is made of metal or plastic.

[0172] Optionally, in some embodiments, when the material of the housing assembly 410 is metal, it can be aluminum or steel, etc., and when the material of the housing assembly 410 is plastic, it can be a composite material with high hardness or a non-metallic material such as PA, PC, PET, etc.

[0173] The housing assembly 410 is made of metal or plastic. Compared with the aluminum-plastic film shell of the soft-pack battery cell 4201, it has a more stable structure and higher strength. This can reduce the probability of deformation of the cavity 414 where the cell assembly 420 is located, effectively protect the soft-pack battery cell 4201, and improve the stability and service life of the cell assembly 420.

[0174] In the above technical solution, the material of the housing component 410 is metal or plastic, and its hardness is higher than that of the outer shell of the soft-pack battery cell 4201. When subjected to external vibration and impact, the housing component 410 can provide support and protection for the soft-pack battery cell 4201, reducing the risk of deformation and damage to the soft-pack battery cell 4201.

[0175] In some embodiments of this 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.

[0176] In this embodiment, the soft-pack battery cell 4201 can be any one of a lithium iron phosphate battery cell, a ternary battery cell, or a solid-state battery cell. Lithium iron phosphate battery cells have advantages such as high reliability, long cycle life, and good high-temperature performance. Ternary battery cells have advantages such as high energy density and fast charging. Solid-state battery cells have advantages such as high reliability, high energy density, and long cycle life. For example, solid-state battery cells can be sulfide solid-state batteries, oxide solid-state batteries, polymer solid-state batteries, composite solid-state electrolyte batteries, garnet solid-state batteries, etc.

[0177] As an optional solution, in some embodiments, when the pouch cell 4201 is a lithium iron phosphate cell, the positive electrode material of the pouch cell 4201 has the following proportions: 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 (e.g., including but 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 (e.g., including but not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.). For example, when the pouch cell 4201 is a lithium iron phosphate cell, the positive electrode active material is LFP (which can refer to LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. The ratio of LFP:PVDF:conductive carbon black can be 96:2:2, meaning that out of 100 parts by weight of the positive electrode active material, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit for the positive electrode active material can be 10 grams. When the pouch cell 4201 is a ternary lithium battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts (e.g., including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts (e.g., including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium battery cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt 15 aluminum oxide, etc. For example, the ternary material in the ternary lithium battery cell can be an octet LiNi alloy. 0.8 Co 0.1 Mn 0.1 The weight ratio of O2, positive electrode active material, binder, and conductive agent is 96:2.5:1.5, meaning the total weight of the positive electrode material is divided into 100 parts. (This refers to the octet LiNi...) 0.8 Co 0.1 Mn 0.1The composition of O2 is 96 parts, binder is 2.5 parts, and conductive agent is 1.5 parts. In the above technical solution, when the soft-pack battery cell 4201 is a lithium iron phosphate cell, the high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device 100, enabling the lithium iron phosphate cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. The use of binder and conductive agent within the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 4201 is a ternary cell, due to the relatively complex structure and surface properties of ternary materials, using the above proportions of positive electrode active material, binder, and conductive agent helps to ensure good adhesion between 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. This helps to reduce the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device 100.

[0178] In the above technical solution, the soft-pack battery cell 4201 is set as any one of lithium iron phosphate battery cell, ternary battery cell and solid-state battery cell, so that the soft-pack battery cell 4201 can be flexibly set as different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 4201 wider and enabling the battery device 100 to better meet different usage needs.

[0179] In some embodiments of this application, the housing assembly 410 includes a second opening 415, which communicates with the receiving cavity 414. The housing assembly 410 is provided with a reinforcing part 450 near the second opening 415, and the housing assembly 410 is connected to the base plate through the reinforcing part 450.

[0180] The battery cell assembly 400 is fixedly connected to the bottom plate of the housing 430 via the housing assembly 410. The second opening 415 is located near the bottom plate of the housing 430, and the reinforcing part 450 is located near the second opening 415. This can improve the housing strength of the housing assembly 410, making the second opening 415 less prone to deformation. It can effectively fix the cell assembly 420, while ensuring the stability of the connection between the battery cell assembly 400 and the housing 430. It can provide stable support for the soft-pack battery cell 4201, prevent the soft-pack battery cell 4201 from being deformed by external impact, and disperse the external impact force to the entire housing 430, thereby improving the service life of the soft-pack battery cell 4201.

[0181] In the above technical solution, the housing assembly 410 includes a second opening 415, which communicates with the receiving cavity 414. A reinforcing part 450 is provided near the second opening 415 in the housing assembly 410. The housing assembly 410 is connected to the base plate through the reinforcing part 450, which allows the battery cell assembly 400 to be connected to the housing 430 of the battery device 100 as a whole. This can further improve the vibration and impact resistance of the soft-pack battery cell 4201 and reduce the risk of deformation and displacement of the soft-pack battery cell 4201. At the same time, the reinforcing part 450 can improve the strength of the housing assembly 410, making the housing assembly 410 less prone to deformation and providing better protection for the cell assembly 420.

[0182] In some embodiments of the application, the bottom plate of the housing 430 is provided with a slot, and the reinforcing part 450 is inserted into the slot.

[0183] In the above technical solution, the bottom plate is provided with a slot, and the reinforcing part 450 is inserted into the slot, which can improve the connection strength between the housing assembly 410 and the bottom plate of the box 430. When subjected to vibration and impact, it is not easy to separate from the box 430, and the impact force can be distributed to the entire box 430, so that the stress is even and the housing assembly 410 is not easily deformed. At the same time, the reinforcing part 450 is inserted into the slot, which can reduce the size of the housing assembly 410 along the width direction of the soft pack battery cell 4201, which is conducive to saving space in the box 430 and improving space utilization.

[0184] In some embodiments of this application, the battery device 100 further includes a thermally conductive structural adhesive, and the side of the pouch cell 4201 near the second opening 415 is bonded to the base plate by the thermally conductive structural adhesive.

[0185] The side of the pouch battery cell 4201 near the second opening 415 can be the fourth surface 4212 of the pouch battery cell 4201 near the second opening 415. The fourth surfaces 4212 of multiple pouch battery cells 4201 near the second opening 415 are bonded to the bottom plate of the housing 430 by thermally conductive structural adhesive, which can improve the bonding force between the cell assembly 420 and the housing 430. When subjected to external impact and vibration, the pouch battery cell 4201 is not easy to be displaced or deformed.

[0186] The side of the pouch battery cell 4201 closest to the second opening 415 is bonded to the base plate with thermally conductive structural adhesive. Based on the reinforcement part 450 of the housing assembly 410 being fixed to the base plate through a slot, the pouch battery cell 4201 is bonded to the base plate with thermally conductive structural adhesive. This can further improve the connection strength between the battery cell assembly 400 and the housing 430, reduce the risk of displacement and deformation of the pouch battery cell 4201, and at the same time, the thermally conductive structural adhesive can conduct the heat generated by the pouch battery cell 4201 to the base plate of the housing 430, which helps to reduce the temperature of the pouch battery cell 4201 and reduce the risk of thermal runaway.

[0187] In some embodiments of this application, the base plate is a heat exchange plate, and the pouch cell is bonded to the heat exchange plate by a thermally conductive structural adhesive. Heat exchange channels are formed within the heat exchange plate to accommodate and allow flow of the heat exchange medium. The heat exchange medium can contact the pouch cell 4201 at intervals through the heat exchange plate to exchange heat with the pouch cell 4201.

[0188] Because the heat exchange plate exchanges heat with the pouch cell 4201, when the temperature of the pouch cell 4201 is high, heat can be transferred to the heat exchanger through thermal conduction, so that the pouch cell 4201 is in a suitable operating temperature range, thereby improving the service life of the battery device 100. When the temperature of the pouch cell 4201 is too low, the heat exchange medium can heat the pouch cell 4201 through the heat exchanger to improve the charging and discharging efficiency of the pouch cell 4201.

[0189] In the above technical solution, by integrating the heat exchange plate with the bottom plate of the housing 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, thereby improving the charging and discharging efficiency of the soft-pack battery cell 4201, extending the service life of the battery device 100, further reducing the risk of thermal runaway of the soft-pack battery cell 4201, and also improving the space utilization of the housing.

[0190] In some embodiments of this application, the reinforcement 450 is formed by bending the housing of the housing assembly 410.

[0191] In the above technical solution, the reinforcing part 450 is formed by bending the shell of the shell assembly 410. The reinforcing part 450 and the shell assembly 410 are integrally formed, which helps to simplify the processing technology, improve the production cycle, and does not introduce new parts, thus helping to reduce production and manufacturing costs.

[0192] In some embodiments of this application, the reinforcing part 450 is wavy.

[0193] In the above technical solution, the reinforcing part 450 is set in a wave shape, which can further improve the shell strength of the shell assembly 410, and the fixing part is not easily deformed. It can provide stable support and protection for the cell assembly 420 and reduce the risk of deformation and displacement of the soft pack battery cell 4201.

[0194] In some embodiments of this application, the reinforcement 450 is formed by locally thickening the housing of the housing assembly 410.

[0195] In the above technical solution, the reinforcing part 450 is formed by locally thickening the shell of the shell assembly 410, which can reduce the processing difficulty of the reinforcing part 450, facilitate production and manufacturing, and improve production efficiency.

[0196] In some embodiments of this application, the battery device 100 further includes an expansion beam connected to the base plate, and the housing assembly 410 abuts against the expansion beam along the thickness direction X of the pouch battery cell.

[0197] The expansion beam generally abuts against both sides of the housing assembly 410 of the battery cell assembly 400 along the thickness direction X of the soft-pack battery cell. It can absorb the expansion force of the soft-pack battery cell 4201, reduce the risk of deformation of the housing assembly 410, ensure that the housing assembly 410 can stably maintain the position of the cell assembly 420, and reduce the risk of displacement deformation of the soft-pack battery cell 4201, which may lead to short circuit and leakage.

[0198] In the above technical solution, the battery device 100 also includes an expansion beam connected to the base plate. The housing assembly 410 abuts against the expansion beam along the thickness direction X of the soft-pack battery cell. This can reduce the number of internal parts of the housing 430, improve the internal space utilization of the housing 430, accommodate more battery cell assemblies 400, and help increase the capacity of the battery device 100. Furthermore, the expansion beam abuts against the housing 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 to the housing assembly 410.

[0199] Secondly, this application provides an electrical device including a battery device 100 according to the first aspect of this application.

[0200] In the above embodiments, by providing the battery device 100 of the first aspect, the battery cell assembly 400 includes a housing assembly 410. The housing assembly 410 can accommodate the cell assembly 420 within the housing, which can reduce the range of movement and deformation of each pouch battery cell 4201 in the cell assembly 420, improve the positional stability of the pouch battery cell 4201 within the battery cell assembly 400, and reduce the risk of the pouch battery cell 4201 moving due to vibration and impact, thereby causing leakage or short circuit. In addition, the housing assembly 410 includes a first housing 411 and a second housing 412. The first housing 411 has a first opening 413 and a second opening 415 facing different directions. When the cell assembly 420 is installed in the housing, it is installed through the first opening 413 without deforming the first housing 411, which can improve the assembly accuracy of the cell assembly 420. After the assembly is in place, the second housing 412 and the first housing 411 cooperate to constrain the cell assembly 420 and provide protection for the cell assembly 420. Meanwhile, the second opening 415 can be bonded to the housing 430, further improving the positional stability of the cell assembly 420. In addition, the housing assembly 410 can also disperse external impact forces, reducing the probability that a single pouch battery cell 4201 will be subjected to excessive impact forces, increasing the service life of the pouch battery cell 4201, and increasing the service life of the battery device 100, thereby improving the overall performance of the electrical device.

[0201] In some embodiments of this application, the electrical device includes a vehicle, the vehicle includes a floor, the housing 430 includes a second opening 440, and the floor covers the second opening 440.

[0202] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box 430 includes a second opening 440, the floor covers the second opening 440, and the box 430 of the battery device 100 uses the vehicle's own floor as a box cover for sealing, which can reduce costs, improve space utilization, increase the capacity of the box 430, and increase the vehicle chassis height.

[0203] A battery device 100 according to a specific embodiment of the present application will now be described with reference to Figures 3 and 6.

[0204] The battery assembly 100 includes a housing 430, a battery cell assembly 400, and a heat exchange plate. The housing 430 is rectangular in shape and has a second opening 440 at the top. The battery cell assembly 400 is installed in the housing through the second opening 440 at the top of the housing 430.

[0205] The battery cell assembly 400 is placed inside the housing 430 and supported on the bottom plate of the housing 430. The battery cell assembly 400 includes a plurality of housing assemblies 410 arranged sequentially along the thickness direction X of the soft-pack battery cell, and cell groups 420 respectively housed in the receiving cavity 414 of the corresponding housing assembly 410. Each cell group 420 includes one or more soft-pack battery cells 4201.

[0206] The housing assembly 410 includes a first housing 411 and a second housing 412. The first housing 411 is provided with a first opening 413 and a second opening 415 facing different directions, and is in the shape of an "L". The first opening 413 and the second opening 415 are formed by an opening on the side of the thickness direction X of the soft-pack battery cell and an opening on the side of the width direction Y of the soft-pack battery cell. The second housing 412 is in the shape of an "I" and is provided at the first opening 413 of the first housing 411, specifically at the opening of the first housing 411 along the thickness direction of the soft-pack battery cell 4201.

[0207] The pouch battery cell 4201 includes two third surfaces 4211 disposed opposite to each other along its thickness direction and two fourth surfaces 4212 disposed opposite to each other along its width direction. Multiple pouch battery cells 4201 are assembled into the casing along their thickness direction through a first opening 413 structure. The third surfaces 4211 of the pouch battery cells 4201 located on both sides of the thickness direction form two first surfaces 422 of the cell assembly 420. The fourth surfaces 4212 of each pouch battery cell 4201 located on both sides of the width direction form two second surfaces 423 of the cell assembly 420.

[0208] The third surface 4211 and the fourth surface 4212 of any pouch cell 4201 are connected by an R-angle, and a baffle structure 4213 is provided between the R-angles of two adjacent pouch cells 4201 within the same receiving cavity 414.

[0209] The first housing 411 includes a first fixing part 4111 and a second fixing part 4112 connected to each other. The first fixing part 4111 covers the first surface 422 of the cell assembly 420 away from the structure of the first opening 413 along the thickness direction X of the soft-pack battery cell. The second fixing part 4112 covers a second surface 423 of the cell assembly 420. The second housing 412 includes a third fixing part 4121, which covers another first surface 422 of the cell assembly 420 facing the first opening 413.

[0210] In the same housing assembly 410, the third surface 4211, the first fixing part 4111, and the third fixing part 4121 of each pouch battery cell 4201 are coated with an adhesive so that the multiple pouch battery cells 4201 and the housing assembly 410 are connected into a whole.

[0211] Along the thickness direction X of the pouch cell, any two adjacent housing assemblies 410 share a housing. Specifically, the portion of the first surface 422 of one housing assembly 410 that is directly opposite the first opening 413, which is covered by the first housing 411 or the second housing 412, shares a housing with the portion of the second housing 412 or the first housing 411 of another adjacent housing assembly 410 that is covered by the first surface 422 away from the first opening 413.

[0212] The housing assembly 410 has a second opening 415 along the width direction Y of the soft-pack battery cell. The second opening 415 is connected to the receiving cavity 414 of the housing assembly 410. Near the second opening 415, the housing assembly 410 has a reinforcing part 450. The reinforcing part 450 is bent into a wave shape by the housing assembly 410. The housing assembly 410 is connected to the bottom plate of the box 430 through the reinforcing part 450. The second surface 423 of the cell assembly 420 near the second opening 415 is bonded to the heat exchange plate by thermally conductive structural adhesive.

[0213] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, include: The housing has a base plate for supporting individual battery cells; The battery cell assembly includes a housing assembly, which 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, together with the first housing, forms a receiving cavity. A battery cell assembly is disposed in the receiving cavity, the battery cell assembly including at least one pouch battery cell, at least one surface of the pouch battery cell being bonded to the housing through the second opening; The cell assembly has two first surfaces opposite each other along the thickness direction of the pouch cell, both first surfaces are connected to the housing assembly, and one of the two first surfaces faces the first opening.

2. The battery device according to claim 1, wherein, The cell assembly also has two second surfaces opposite each other along the width direction of the pouch cell, the two second surfaces being spaced apart between the two first surfaces; The first housing includes a first fixing part and a second fixing part. The first fixing part covers at least a portion of one of the first surfaces along the thickness direction of the pouch battery cell. The second fixing part is connected to one side of the first fixing part along the thickness direction of the pouch battery cell and covers at least a portion of the second surface along the width direction of the pouch battery cell. The second housing includes a third fixing part disposed on the side of the second fixing part away from the first fixing part, and covering at least a portion of another first surface along the thickness direction of the pouch battery cell.

3. The battery device according to claim 2, wherein, The second housing further includes a fourth fixing part, which is connected to the third fixing part on one side along the width direction of the soft-pack battery cell, and is disposed in conjunction with the second fixing part, and together they cover the second surface of the cell assembly.

4. The battery device according to claim 3, wherein, 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.

5. The battery device according to claim 2, wherein, The first housing further includes a fifth fixing part, which is connected to the side of the second fixing part away from the first fixing part and is disposed with the third fixing part along the width direction of the soft-pack battery cell, and together with the third fixing part along the thickness direction of the soft-pack battery cell, covers another first surface.

6. The battery device according to claim 5, wherein, The docking position of the third fixing part and the fifth fixing part is located at the middle of the width of the soft-pack battery cell.

7. The battery device according to any one of claims 1 to 6, wherein, The pouch battery cell includes a casing and an electrode assembly, with the casing enclosing the electrode assembly. The electrode assembly is formed by winding or stacking electrode sheets.

8. The battery device according to any one of claims 1 to 7, wherein, The battery cell assembly includes multiple housing assemblies, which are arranged sequentially along the thickness direction of the pouch battery cell, and each housing assembly contains a cell assembly within its accommodating cavity.

9. The battery device according to claim 8, wherein, At least two adjacent housing assemblies share a portion of the housing.

10. The battery device according to claim 9, wherein: The soft-pack battery cell includes two oppositely arranged third surfaces and two oppositely arranged fourth surfaces, wherein the surface area of ​​the third surfaces is larger than that of the fourth surfaces; The third surfaces of the pouch cell located on both sides within the same receiving cavity form the first surface of the cell assembly; All the fourth surfaces located within the same receiving cavity together form the second surface of the battery cell assembly; Any two adjacent housing assemblies, wherein the portion of the first housing of one of them covering the first surface along the thickness direction of the pouch battery cell and the portion of the second housing of the other of them covering the first surface along the thickness direction of the pouch battery cell share a housing.

11. The battery device according to claim 10, wherein, The third and fourth surfaces of any of the pouch cell cells are connected by a transition portion.

12. The battery device according to claim 11, wherein, The transition section is an R-angle.

13. The battery device according to claim 12, wherein, An adhesive-blocking structure is provided between the radius (R) corners of any two adjacent pouch battery cells located within the same receiving cavity, and the adhesive-blocking structure is connected to the bottom of the housing.

14. The battery device according to claim 13, wherein, The adhesive-blocking structure is an adhesive-blocking strip.

15. The battery device according to any one of claims 10 to 14, wherein, It also includes an adhesive, the cell assembly comprising a plurality of the pouch cell units, the third surfaces of the plurality of pouch cell units being connected to each other and to the housing assembly via the adhesive.

16. The battery device according to any one of claims 8 to 15, wherein, The first opening is located on one side of the thickness direction of the pouch battery cell, and the second opening is located on one side of the width direction of the pouch battery cell.

17. The battery device according to claim 16, wherein, Along the thickness direction of the pouch cell, the second openings of any two adjacent housing assemblies face opposite directions.

18. The battery device according to any one of claims 1-17, wherein, The housing assembly is made of metal or plastic.

19. The battery device according to any one of claims 1-18, wherein, The soft-pack battery cell can be any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

20. The battery device according to claim 19, wherein, The soft-pack battery cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(1-3):(1-3); the soft-pack battery cell is a ternary battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(2-3):(1-2).

21. The battery device according to any one of claims 1-20, wherein, The second opening communicates with the receiving cavity, and a reinforcing part is provided on the housing assembly near the second opening. The housing assembly is connected to the base plate through the reinforcing part.

22. The battery device according to claim 21, wherein, The base plate is provided with a slot, and the reinforcing part is inserted into the slot.

23. The battery device according to claim 22, wherein, The battery device also includes a thermally conductive structural adhesive, and the side of the pouch battery cell closest to the second opening is bonded to the base plate by the thermally conductive structural adhesive.

24. The battery device according to claim 23, wherein, The base plate is a heat exchange plate, and the soft-pack battery cells are bonded to the heat exchange plate by the thermally conductive structural adhesive.

25. The battery device according to any one of claims 21 to 24, wherein, The reinforcing part is formed by bending the shell of the shell assembly.

26. The battery device according to claim 25, wherein, The reinforcing part is wavy.

27. The battery device according to any one of claims 21 to 24, wherein, The reinforcing portion is formed by locally thickening the shell of the shell assembly.

28. The battery device according to any one of claims 1-27, wherein the battery device further comprises an expansion beam connected to the base plate, and the housing assembly abutting against the expansion beam along the thickness direction of the pouch cell.

29. An electrical appliance, wherein, Includes the battery device as described in any one of claims 1 to 28.

30. The electrical appliance according to claim 29, wherein, The electrical device includes a vehicle, the vehicle includes a floor, the housing includes a second opening, and the floor covers the second opening.

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