Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, and relates to the field of batteries. The battery device comprises a box body and a battery monomer arranged in the box body; the box body comprises a bottom plate and side edge beams arranged on opposite sides of the bottom plate, and the battery monomer is arranged between the two side edge beams; the side edge beam comprises a first side wall and a second side wall, the second side wall is arranged on the side of the first side wall away from the battery monomer, and the rigidity of at least part of the position of the first side wall is smaller than the rigidity of the second side wall; the first side wall comprises an arc-shaped segment arranged in an arc shape, and the center of the arc-shaped segment is located on the side of the first side wall away from the battery monomer. When a lateral collision is suffered, the second side wall on the outside can effectively resist external force, the risk of damage of the side edge beam is reduced, the first side wall can allow a certain degree of controllable deformation, so that the collision energy can be absorbed, the damage caused by the impact force to the battery monomer is reduced, and the use safety of the battery device is improved.

Description

Technical Field

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

[0002] As electric vehicles become increasingly sophisticated, the demands on energy density and safety performance of their battery systems are rising. A battery system typically consists of a casing and individual battery cells housed within it. The individual battery cells are the primary components of the battery system that undergo charge-discharge cycles, and improving the safety of these cells during side collisions is a crucial way to enhance the overall safety of electric vehicles.

[0003] Since battery packs are often mounted on the vehicle body via the side beams of the housing, the current common practice is to increase the overall thickness of the side beams and the number of reinforcing ribs on the side beams to improve their load-bearing capacity. This reduces the force transmitted to the battery cells during side collisions, preventing deformation and damage to the battery cells, and ensures that the battery pack meets the side pole impact standards.

[0004] However, both increasing the overall thickness of the side beams and increasing the number of reinforcing ribs will increase the cost and weight of the battery pack to varying degrees, affecting the development requirements of lightweight electric vehicles; they will also reduce the energy density of the battery pack. Utility Model Content

[0005] In view of the above problems, this application provides a battery device and an electrical device that can reduce the possibility of individual battery cells being squeezed and deformed due to side impacts without increasing the overall thickness of the side beam, thereby improving the safety of the battery device.

[0006] In a first aspect, this application provides a battery device, including a housing and a battery cell disposed within the housing; the housing includes a base plate and side beams disposed on opposite sides of the base plate, and the battery cell is disposed between the two side beams; the side beams include a first side wall and a second side wall, the second side wall being disposed on the side of the first side wall away from the battery cell, and the stiffness of the first side wall at least in a portion being less than the stiffness of the second side wall; the first side wall includes an arc-shaped segment, the center of which is located on the side of the first side wall away from the battery cell.

[0007] The sidewalls of the side beam are designed with a stiffness distribution that is stronger on the outside and weaker on the inside. The side facing away from the battery cell is designated as the outer side, and the side facing the battery cell is designated as the inner side. In the event of a lateral impact, the outer second sidewall effectively resists the external force, reducing the risk of damage to the side beam. The first sidewall, however, allows for a certain degree of controllable deformation at at least some locations, thereby absorbing impact energy and reducing damage to the battery cell from the impact. Therefore, this battery device can reduce the possibility of battery cells being squeezed and deformed due to a side impact without increasing the overall thickness of the side beam, thus improving the safety of the battery device. An arc segment provides a curved surface that guides the force transmission path during deformation, allowing the force on the first sidewall to be transferred from the contact point with the battery cell to the edge of the curved surface, dispersing the force and reducing the risk of localized impact damage to the first sidewall.

[0008] In some embodiments, the average thickness of the first sidewall is less than the average thickness of the second sidewall; and / or, the elastic modulus of the material of the first sidewall is less than the elastic modulus of the material of the second sidewall.

[0009] By setting the wall thickness of the first sidewall and / or selecting materials with different elastic moduli, the effect of stiffness design with weak inner structure and strong outer structure can be achieved through structural design and / or material selection. The structure is simple and the process is reliable.

[0010] In some embodiments, the position of the first sidewall closest to the battery cell is located in the arc segment.

[0011] Since the closest point between the first sidewall and the battery cell is located in the arc segment, the arc segment preferentially contacts the battery cell. Regardless of the direction in which the first sidewall approaches the battery cell, the arc segment helps to increase the contact area between the first sidewall and the battery cell, disperse local pressure, and prevent the battery cell from being damaged due to concentrated force, thereby improving the protection effect on the battery cell.

[0012] In some embodiments, the radius of the arc segment is 35mm-45mm.

[0013] This design allows the curved segment to form an effective large-area contact with the battery cell, while its curvature is not too large, thus leaving reasonable space for its own deformation.

[0014] In some embodiments, the side beam further includes a first partition bar connecting the first side wall and the second side wall, the first partition bar dividing the space between the first side wall and the second side wall into a plurality of first cavities arranged along the thickness direction of the base plate; the plurality of first cavities include a bottom cavity, the bottom cavity being the first cavity closest to the base plate, and the average thickness of the cavity wall of the bottom cavity being greater than the average thickness of the cavity walls of the other first cavities.

[0015] By setting a first rib between the first sidewall and the second sidewall, multiple first cavity structures are formed. The side beams of this structure can significantly improve the bending and torsional stiffness of the side beams without significantly increasing the amount of material used, thereby enhancing the overall load-bearing capacity and achieving the effect of not easily causing overall instability when facing lateral impacts, thus better protecting the battery cells.

[0016] Because the average thickness of the cavity wall of the bottom cavity is greater than the average thickness of the cavity walls of other first cavities, the stiffness of the part of the side beam near the bottom plate is higher than that of the part far from the bottom plate. Therefore, when the side beam is subjected to a collision, the part far from the bottom plate can deform and absorb energy earlier and more effectively. At the same time, the part near the bottom plate can better maintain its shape, preventing the side beam from deforming and breaking as a whole. This creates a synergistic protection effect between different parts. While maintaining the overall stability of the side beam, the local part of the side beam is easy to deform and absorb energy, reducing the risk of damage and leakage of individual battery cells.

[0017] In some embodiments, the average thickness of the first sidewall is 1.8 mm to 2.8 mm; and / or,

[0018] The average thickness of the second sidewall is 2mm-4mm.

[0019] In some embodiments, the average thickness of the first rib is 1.8 mm to 2.8 mm.

[0020] In this embodiment, the design of the first sidewall, second sidewall, and first rib is based on a balance between lightweighting, cost control, and collision safety performance of the battery device. When at least one of the thicknesses of the first sidewall, second sidewall, and first rib meets the above requirements, the structure of other parts can be designed based on this thickness. This design ensures that the first sidewall, second sidewall, and first rib have sufficient rigidity and strength to meet the side impact requirements, while avoiding unnecessary weight and cost increases due to excessive material thickness. In some embodiments, at least one first rib is arc-shaped.

[0021] With its arc-shaped design, the first rib can more effectively disperse and transmit the lateral impact force to the surrounding structure when under stress, thereby enhancing the overall energy transfer efficiency of the side beam and helping the first rib to deform and absorb energy quickly along the arc-shaped bending direction.

[0022] In some embodiments, at least one end of an arc-shaped first rib is connected to a first position of the arc segment, the first position corresponding to the position where the arc segment is closest to the battery cell.

[0023] Since the first position corresponds to the closest point between the arc-shaped segment and the battery cell, the arc-shaped segment is most likely to come into contact with the battery cell first at the first position and compress against it. When the first sidewall deforms towards the second sidewall due to the compression of the battery cell, this compressive force can be transmitted to the first rib through the first position, and then the force can be guided and transmitted to other parts of the side beam, especially its lower and outer parts, thereby forming a coordinated force distribution and minimizing the concentration of force at the weak point of the first sidewall.

[0024] In some embodiments, at least one arc-shaped first rib has a radius of 20mm-30mm.

[0025] The arc-shaped first rib can ensure that it has a certain curvature to facilitate deformation, without excessively increasing the space occupied between the first side wall and the second side arm, thus preventing the side beam from becoming too thick.

[0026] In some embodiments, the enclosure further includes a mounting beam located on the side of the side beam opposite to the battery cell and connected to the second side wall. The mounting beam is used to connect to an electrical device. The mounting beam includes a third side wall and a fourth side wall. In the thickness direction of the base plate, the distance between the third side wall and the base plate is less than the distance between the fourth side wall and the base plate, and the stiffness of the third side wall is greater than that of the fourth side wall.

[0027] Because the mounting beam is connected to the second sidewall, when the side beam is subjected to a side collision, the force on the side beam will be transferred to the mounting beam through the second sidewall, and then to other structures of the electrical unit. Since the force on the battery unit typically slopes from the side of the side beam away from the floor towards the floor, the third sidewall is closer to the part of the battery unit that is subjected to a side collision impact than the fourth sidewall. When the stiffness of the third sidewall is greater than that of the fourth sidewall, the fourth sidewall is more likely to deform, thereby absorbing the collision load and reducing the transmission of the collision load to the battery cells. The third sidewall, on the other hand, can maintain a good connection with other parts of the electrical unit, limiting further deformation of the mounting beam and side beam, and protecting the battery cells. Therefore, the above design of the mounting beam allows it to better withstand and transmit collision loads from the vehicle body, and forms a coherent, high-rigidity force transmission system with the side beams, better reducing the collision load transmitted to the battery cells and protecting them.

[0028] In some embodiments, the average thickness of the third sidewall is greater than the average thickness of the fourth sidewall; and / or, the elastic modulus of the material of the third sidewall is greater than the elastic modulus of the material of the fourth sidewall.

[0029] The above scheme achieves the effect of upper-weak and lower-strong stiffness design of the suspended beam through structural design and / or material selection. The structure is simple and the process is reliable.

[0030] In some embodiments, the average thickness of the third sidewall is 3mm-5mm.

[0031] By optimizing the thickness range of the third sidewall, the connection point between the mounting beam and the electrical device has sufficient strength and stability, without excessively increasing the weight of the mounting beam.

[0032] In some embodiments, the mounting beam further includes a second rib, which is disposed between the third sidewall and the fourth sidewall and divides the space between the third sidewall and the fourth sidewall into a plurality of second cavities.

[0033] By setting a second rib inside the mounting beam to form a second cavity, the rigidity of the mounting beam itself can be improved, making it safer in connecting electrical devices and resisting lateral collisions, and preventing the mounting beam from becoming a weak point in force transmission.

[0034] In some embodiments, the housing further includes a top cover and a reinforcing member. The top cover is disposed opposite to the bottom plate, and the battery cell is disposed between the bottom plate and the top cover. The reinforcing member is disposed on the side of the top cover away from the bottom plate, and along the thickness direction of the bottom plate, the projection of the reinforcing member on the top cover at least partially overlaps with the projection of the side beam on the top cover.

[0035] In the event of a side collision, the battery pack typically begins to bear force from the part of the top cover near the side beam, and then the force is transferred to the side beam. This application addresses this by placing a reinforcing member on the side of the top cover away from the bottom plate, and ensuring that the projection of the reinforcing member on the top cover at least partially overlaps with the projection of the side beam on the top cover. This directly improves the local stiffness of the top cover in the area where the force begins to be borne, reduces the probability of severe deformation and damage to the top cover, and provides more reliable protection for the battery cells.

[0036] In some embodiments, along the thickness direction of the base plate, the projection of the side beam onto the top cover includes a first region, which is the projection area of ​​the middle half segment of the side beam along its own length direction onto the top cover; the projection area of ​​the reinforcement overlapping with the side beam includes at least the first region.

[0037] The projection area of ​​the middle half of the side beam along its own length onto the top cover is usually the most vulnerable to impact. By precisely placing the reinforcement in the area most prone to impact and deformation, the top cover can be precisely reinforced while reducing unnecessary weight increase of the battery device.

[0038] In some embodiments, the strength of the reinforcing member is greater than the strength of the top cover.

[0039] By making the strength of the reinforcing component greater than that of the top cover, the reinforcing component can better resist collision impacts, absorb impact loads, protect the top cover, and thus protect the battery cells.

[0040] In some embodiments, the yield strength of the reinforcing member is greater than the yield strength of the top cover; and / or, the thickness of the reinforcing member is greater than the thickness of the top cover; and / or, the reinforcing member includes a reinforcing plate and a reinforcing rib, the reinforcing plate being connected to the top cover, the reinforcing rib being connected to the reinforcing plate, and protruding from one side of the reinforcing plate.

[0041] The above three implementation methods achieve the effect that the strength of the reinforcing component is greater than that of the top cover by selecting the material, thickness and structural design of the reinforcing component. This enhances the ability of the reinforcing component to absorb and resist impact forces, and can better absorb impact loads, protect the top cover and thus protect the battery cells.

[0042] In some embodiments, the reinforcing member includes a reinforcing plate with a flow channel formed thereon. The reinforcing plate is connected to the top cover, and the flow channel is used for liquid to flow out from between the reinforcing member and the top cover.

[0043] During the manufacturing and use of the battery device, when there is liquid on the top cover, the liquid can flow out from between the reinforcement and the top cover through the drainage channel, preventing the liquid from accumulating on the top cover for a long time or causing local corrosion between the top cover and the reinforcement.

[0044] Secondly, this application provides an electrical device, including the battery device in any of the foregoing embodiments.

[0045] Because the aforementioned battery device has excellent side-impact resistance, lightweight characteristics, and high safety, electrical devices containing this battery device can achieve a higher level of collision safety, lightweight design, and higher overall safety and reliability.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 This is a schematic diagram of the structure of a vehicle according to some embodiments of this application.

[0049] Figure 2 An exploded view of a battery device according to some embodiments of this application.

[0050] Figure 3This is an exploded structural diagram of a battery cell according to some embodiments of this application.

[0051] Figure 4 This is a schematic diagram of the structure of a second type of battery device according to some embodiments of this application, wherein only some battery cells are shown for ease of understanding.

[0052] Figure 5 for Figure 4 A partial cross-sectional view of surface AA.

[0053] Figure 6 for Figure 5 A magnified structural diagram at point B in the middle.

[0054] Figure 7 This is a schematic diagram of the structure of the cover in some embodiments of this application.

[0055] Figure 8 for Figure 7 A magnified structural diagram at point C.

[0056] The reference numerals in the detailed embodiments are as follows:

[0057] 01. Vehicle; 1000. Battery unit; 2000. Controller; 3000. Motor;

[0058] 1100. Box body; 1110. First part; 1120. Second part; 1130. Bottom plate; 1140. Side beam; 1141. First side wall; 1142. Second side wall; 1143. First straight section; 1144. Second straight section; 1145. First rib; 1146. First cavity; 1147. Arc-shaped section; a. Bottom cavity; M. First position; N. Quadrant point; 1150. Mounting beam; 1151. Third side wall; 1152. Fourth side wall; 1153. Second rib; 1154. Second cavity; 1160. Top cover; 1170. Reinforcing member; 1171. Reinforcing plate; 1172. Reinforcing rib; 1173. Flow channel;

[0059] 1200, Battery cell; 1210, Casing; 1211, Housing; 1212, End cap; 1220, Electrode assembly; 1230, Positive electrode tab; 1240, Negative electrode tab; 1250, Electrode terminal. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0063] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0068] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., 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 do not 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.

[0069] In this application, "greater than or equal to", "greater than or equal to", and "≥" have the same meaning and can be used interchangeably; "less than or equal to", "less than or equal to", and "≤" have the same meaning and can be used interchangeably; "greater than" can be equivalently represented as ">", and "less than" can be equivalently represented as "<". In this application, unless otherwise specified, "greater than or equal to" and "≥" can be considered as providing two additional solutions: "greater than" and "equal to". In this application, unless otherwise specified, "less than or equal to" and "≤" can be considered as providing two additional solutions: "less than" and "equal to".

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0071] With the increasing popularity of electric vehicles, people have put forward higher requirements for the safety performance of electric vehicles, and the safety of the battery device is the most important. However, the factors that may cause safety problems in the use of the battery device include not only the safety settings of the battery device itself, but also the operating conditions of the electric vehicle.

[0072] Among the various types of accidents involving electric vehicles, battery leakage and fires caused by collisions are a significant contributing factor. Side impacts are a common type of accident, where the battery unit, mounted on the vehicle's chassis, is struck from above and to the side by the vehicle's suspension, leading to battery leakage and fires.

[0073] Therefore, conducting side impact tests on battery devices before they leave the factory to ensure that they have sufficient resistance to side impacts is an essential inspection process to improve the safety of battery devices.

[0074] To improve the pass rate of the battery device in this inspection process, this application optimizes the structure of the battery device.

[0075] A battery pack typically consists of a housing and individual battery cells housed within it. The individual battery cells are the components that undergo charge-discharge cycles and are ultimately the parts that require protection. The housing includes side beams, which are located close to the vehicle's suspension during battery operation. Therefore, improving the load-bearing capacity and deformation resistance of the side beams is a viable approach to protecting the individual battery cells.

[0076] This application provides a battery device in which the stiffness of at least a portion of the side wall of the side beam near the battery cell is less than the stiffness of the side wall away from the battery cell. This achieves a stiffness distribution of stronger outer side and weaker inner side, where the side away from the battery cell is the outer side and the side facing the battery cell is the inner side. When the battery device is subjected to a lateral impact, the side wall away from the battery cell has higher stiffness, effectively resisting external forces and reducing the risk of damage to the side beam. The side wall near the battery cell has lower stiffness, thus allowing for a certain degree of controllable deformation, thereby absorbing impact energy and reducing the damage caused to the battery cell by the impact force. Therefore, this battery device can reduce the possibility of battery cells being squeezed and deformed due to a lateral impact without increasing the overall thickness and material weight of the side beam, thereby improving the safety of the battery device.

[0077] The battery device disclosed in this application can be used in electrical devices or energy storage systems that use a battery device as a power source and may be subject to side collisions during use. The electrical device can be, but is not limited to, electric vehicles, electric cars, ships, spacecraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0078] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0079] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. Vehicle 01 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 1000 is installed inside vehicle 01, and the battery device 1000 can be located at the bottom, front, or rear of vehicle 01. The battery device 1000 can be used to power vehicle 01; for example, the battery device 1000 can serve as the operating power source for vehicle 01. Vehicle 01 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, to meet the power needs of vehicle 01 during starting, navigation, and driving.

[0080] In some embodiments of this application, the battery device 1000 can not only serve as the operating power source for the vehicle 01, but also as the driving power source for the vehicle 01, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 01.

[0081] The battery device 1000 mentioned in the embodiments of this application may include one or more battery cell assemblies. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connection through a busbar.

[0082] In some embodiments, a battery cell assembly is formed by arranging multiple battery cells.

[0083] 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 an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0084] In some embodiments, the battery device 1000 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing 1100.

[0085] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0086] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0087] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. Figure 2In the example shown, the battery device 1000 includes a housing 1100 and a battery cell 1200, with the battery cell 1200 housed within the housing 1100. The housing 1100 provides space for the battery cell 1200, and the housing 1100 can have various structures.

[0088] In some embodiments, the housing 1100 may include a first portion 1110 and a second portion 1120, which overlap each other, and together define a receiving space for accommodating the battery cell 1200. The second portion 1120 may be a hollow structure with one open end, and the first portion 1110 may be a plate-like structure, covering the open side of the second portion 1120 so that the first portion 1110 and the second portion 1120 together define the receiving space; alternatively, the first portion 1110 and the second portion 1120 may both be hollow structures with one open side, with the open side of the first portion 1110 covering the open side of the second portion 1120. Of course, the housing 1100 formed by the first portion 1110 and the second portion 1120 may be of various shapes, such as a cylinder, a cuboid, etc.

[0089] In the battery device 1000, there can be multiple battery cells 1200. These multiple battery cells 1200 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 1200 are connected in both series and parallel. The multiple battery cells 1200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1200 is housed within the housing 1100. Alternatively, the battery device 1000 can also consist of multiple battery cells 1200 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 1100. The battery device 1000 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 1200.

[0090] As an example, the structure of the housing 1100 may also include a bottom plate, side beams, and a top cover. The top cover and the bottom plate are connected to the side beams respectively, so that the interior of the housing 1100 forms a space for storing the battery cells 1200.

[0091] Figure 3 This is an exploded view of a single battery cell provided in an embodiment of this application, as shown below. Figure 3 As shown, in some embodiments, the battery cell 1200 may include a housing 1210 and an electrode assembly 1220.

[0092] In some embodiments, the electrode assembly 1220 includes a plurality of stacked positive and negative electrode plates, with a separator disposed between any two adjacent positive and negative electrode plates. The plurality of positive electrode plates may be the same or different. The plurality of negative electrode plates may be the same or different. The plurality of separators may be the same or different.

[0093] In some embodiments, the positive electrode sheet includes a positive current collector and positive active material layers located on both sides of the positive current collector, and the positive current collector is connected to a positive electrode tab 1230.

[0094] In some embodiments, the negative electrode sheet includes a negative current collector and negative active material layers located on both sides of the negative current collector, and the negative current collector is connected to a negative electrode tab 1240.

[0095] In some embodiments, the outer casing 1210 may be a rigid casing, such as an aluminum casing, a steel casing, etc.

[0096] Within a housing 1210, the number of electrode assemblies 1220 can be one or more, which can be selected by those skilled in the art according to actual needs.

[0097] As an example, the battery cell 1200 can be a hard-shell battery or a pouch battery. Hard-shell batteries include cylindrical, prismatic, or other shaped battery cells. Prismatic battery cells include prismatic, blade-shaped, and multi-prismatic cells, such as hexagonal prismatic cells. The pouch battery casing can be an aluminum-plastic film. This embodiment only illustrates the case of a prismatic battery cell 1200 as an example.

[0098] Please continue to refer to Figure 3 In some embodiments, the housing 1210 includes an end cap 1212 and a housing 1211, the housing 1211 having an opening, and the end cap 1212 covering the opening. The housing 1211 may have one or more openings. The end cap 1212 may also have one or more.

[0099] In some embodiments, at least one electrode terminal 1250 is provided on the housing 1210, and the electrode terminal 1250 is electrically connected to the electrode tab. The electrode terminal 1250 can be directly connected to the electrode tab, or it can be indirectly connected to the electrode tab through an adapter. The electrode terminal 1250 can be provided on the end cover 1212, or it can be provided on the housing 1211.

[0100] The outer casing can contain electrolyte, which wets the electrode assembly. Ions can shuttle between the positive and negative electrode plates through the electrolyte to achieve charging and discharging of the battery cell.

[0101] The battery device 1000 provided in the embodiments of this application will be described in detail below.

[0102] Figure 4 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application. Figure 5 for Figure 4 A cross-sectional view of plane AA. Figure 6 for Figure 5 A magnified structural diagram at point B. (See diagram below.) Figure 4 , Figure 5 and Figure 6 As shown, this application provides a battery device 1000, which includes a housing 1100 and a battery cell 1200 disposed within the housing 1100. The housing 1100 includes a bottom plate 1130 and side beams 1140 disposed on opposite sides of the bottom plate 1130. The battery cell 1200 is disposed between the two side beams 1140. The side beams 1140 include a first side wall 1141 and a second side wall 1142. The second side wall 1142 is disposed on the side of the first side wall 1141 away from the battery cell 1200. The stiffness of the first side wall 1141 is less than the stiffness of the second side wall 1142 at least in a portion of its position. The first side wall includes an arc-shaped segment 1147, the center of which is located on the side of the first side wall 1141 away from the battery cell 1200.

[0103] The base plate 1130 is used to support the battery cell 1200, and it can be made of steel plate, copper plate, alloy plate, etc.

[0104] The side beam 1140 extends from one side of the base plate 1130 in the thickness direction, and can be set perpendicular to or not perpendicular to the base plate 1130. The battery cell 1200 is disposed between the two side beams 1140. The two side beams 1140 can restrict the position of the battery cell 1200 and also protect the battery cell 1200.

[0105] In some embodiments, the first sidewall 1141 and the second sidewall 1142 can be independent structures and / or shapes, and the two can be connected by the base plate 1130, for example, by welding to the base plate 1130 respectively.

[0106] When the battery device 1000 is installed in an electrical device, the side beam 1140 usually bears the impact force transmitted from the side of the battery device 1000. Therefore, the ability of the side beam 1140 to resist the impact force determines the magnitude of the impact force that the battery cell 1200 may suffer during a side collision, and thus determines the degree of damage to the battery cell 1200 and the probability of safety accidents such as leakage and fire.

[0107] In this embodiment of the application, the stiffness of the first sidewall 1141 is made less than that of the second sidewall 1142, so that the sidewall of the side beam 1140 satisfies the stiffness distribution law of strong outside and weak inside. The side away from the battery cell 1200 is the outside, and the side facing the battery cell 1200 is the inside.

[0108] When the battery device 1000 is subjected to a side impact, the outer second sidewall 1142 can effectively resist external forces, reducing the risk of severe damage to the side beam 1140. The first sidewall 1141, at least in some locations, can allow for a certain degree of controllable deformation, thereby absorbing impact energy and reducing the damage to the battery cell 1200 caused by the impact. Therefore, the battery device 1000 can reduce the possibility of severe crushing damage to the battery cell 1200 due to a side impact without increasing the overall thickness of the side beam 1140, thus improving the safety of the battery device 1000.

[0109] In this embodiment of the application, there are various ways to achieve a stiffness of the first sidewall 1141 that is less than the stiffness of the second sidewall 1142.

[0110] One approach is to have the average thickness of the first sidewall 1141 be less than the average thickness of the second sidewall 1142.

[0111] For example, the average thickness of the first sidewall 1141 is 1.8 mm to 2.8 mm; and / or, the average thickness of the second sidewall 1142 is 2 mm to 4 mm.

[0112] Specifically, the average thickness of the first sidewall 1141 can be 2 mm, and the average thickness of the second sidewall 1142 can be 3.5 mm. Alternatively, the average thickness of the first sidewall 1141 can be 2 mm, and the average thickness of the second sidewall 1142 can be 4.5 mm. Alternatively, the average thickness of the first sidewall 1141 can be 3 mm, and the average thickness of the second sidewall 1142 can be 4 mm. It is acceptable as long as the average thickness of at least one of the first sidewall 1141 and the second sidewall 1142 meets the corresponding thickness requirement.

[0113] The thickness of the first sidewall 1141 at various locations can be uniform or uneven. Similarly, the thickness of the second sidewall 1142 at various locations can be uniform or uneven.

[0114] Another way to achieve a stiffness of the first sidewall 1141 that is less than that of the second sidewall 1142 is to have a material of the first sidewall 1141 with a less elastic modulus than the material of the second sidewall 1142.

[0115] In this embodiment, the first sidewall 1141 and the second sidewall 1142 are made of different materials. By selecting materials with different elastic moduli, the stiffness design of the side beam 1140, which is weak inside and strong outside, can be achieved by selecting materials.

[0116] It is understandable that the first and second implementation methods mentioned above can be used simultaneously or separately to ultimately achieve the effect of controlling the stiffness of the first sidewall 1141 to be less than the stiffness of the second sidewall 1142.

[0117] The first sidewall 1141 can be curved as a whole or partially curved.

[0118] For example, in some embodiments, the first sidewall 1141 further includes a first straight section 1143 and a second straight section 1144, which are perpendicular to the base plate 1130, and are located on both sides of the arc-shaped section 1147 along the thickness direction of the base plate 1130.

[0119] In this embodiment of the application, "perpendicular" refers to an angle of 90±20° between two perpendicular objects.

[0120] The structure of the first sidewall 1141, consisting of a first straight section 1143, an arc-shaped section 1147, and a second straight section 1144, can reduce the disadvantage of the first sidewall 1141 occupying too much space in the thickness direction, reduce the volume of the side beam 1140, and increase the energy density of the battery device 1000.

[0121] In other embodiments, the first sidewall 1141 is generally arc-shaped. This design helps to reduce the structural and manufacturing complexity of the first sidewall 1141.

[0122] The curved section 1147 provides a curved surface, which can guide the force transmission path when deformed, so that the force on the first sidewall 1141 is transmitted from the contact part with the battery cell 1200 to the edge of the curved surface (i.e. the edge of the curved section 1147), thus dispersing the force and reducing the risk of local impact damage to the first sidewall 1141.

[0123] In some embodiments, the first sidewall 1141 is located at the point closest to the battery cell 1200 in the arc segment 1147.

[0124] Since the closest point between the first sidewall 1141 and the battery cell 1200 is located in the arc segment 1147, the arc segment 1147 preferentially contacts the battery cell 1200. In this way, no matter which direction the first sidewall 1141 approaches the battery cell 1200, it helps to increase the contact area between the first sidewall 1141 and the battery cell 1200, disperse local pressure, and avoid the battery cell 1200 from being damaged due to concentrated force, thereby improving the protection effect on the battery cell 1200.

[0125] In some embodiments, the radius of the arc segment 1147 is 35mm-45mm.

[0126] Specifically, the radius of the arc segment 1147 can be 35mm, 37mm, 40.5mm, 43mm, 45mm, etc.

[0127] This design allows the arc segment 1147 to form an effective large-area contact with the battery cell 1200, while its curvature is not too large, thus leaving reasonable space for its own deformation.

[0128] In some embodiments, the side beam 1140 further includes a first partition 1145 connecting the first side wall 1141 and the second side wall 1142. The first partition 1145 is disposed between the first side wall 1141 and the second side wall 1142 and divides the space between the first side wall 1141 and the second side wall 1142 into a plurality of first cavities 1146 arranged along the thickness direction of the bottom plate 1130.

[0129] The shape, size, material, and connection position of each first rib 1145 can be set independently without being related to each other, and this application embodiment does not impose any restrictions on this.

[0130] The first rib 1145 connects the first sidewall 1141 and the second sidewall 1142, allowing force to be transmitted between them. This structure significantly improves the bending and torsional stiffness of the side beam 1140 without significantly increasing material usage, enhancing overall load-bearing capacity and reducing the likelihood of overall instability under lateral impacts, thus better protecting the battery cell 1200.

[0131] In some embodiments, the plurality of first cavities 1146 include a bottom cavity a, which is the first cavity 1146 closest to the bottom plate 1130, and the average thickness of the sidewall of the bottom cavity a is greater than the average thickness of the sidewall of the other first cavities 1146.

[0132] The average thickness of the sidewall of each first cavity 1146 refers to the average value of the wall thickness at various locations enclosing the cavity.

[0133] Because the average thickness of the sidewall of the bottom cavity a is greater than the average thickness of the sidewall of the other first cavities 1146, the stiffness of the part of the side beam 1140 near the bottom plate 1130 is higher than that of the part far from the bottom plate 1130. Therefore, when the side beam 1140 is subjected to a collision, the part far from the bottom plate 1130 can deform and absorb energy earlier and more effectively. At the same time, the part near the bottom plate 1130 can better maintain its shape, preventing the side beam 1140 from deforming and breaking as a whole. This creates a synergistic protection effect between different parts. While maintaining the overall stability of the side beam 1140, the local part of the side beam 1140 is easy to deform and absorb energy, reducing the risk of damage and leakage of the battery cell 1200.

[0134] In some embodiments, the average thickness of the first rib 1145 is 1.8 mm to 2.8 mm.

[0135] The thickness of each first rib 1145 can be independently located within the above-mentioned range or exceed the above-mentioned range. Those skilled in the art can set the thickness of each first rib 1145 as needed, as long as the average thickness of multiple first ribs 1145 is within the above-mentioned range.

[0136] The design here is based on a balance between lightweighting, cost control, and collision safety performance of the battery device 1000. When the average thickness of the first rib 1145 meets the above requirements, the structure of other parts can be designed based on this thickness dimension. This design ensures that the first rib 1145 has sufficient rigidity and strength to meet the side pillar collision requirements, while avoiding unnecessary weight and cost increases caused by excessive material thickness.

[0137] In some embodiments, at least one first rib 1145 is arc-shaped.

[0138] When the side beam 1140 includes multiple first ribs 1145, only one first rib 1145 may be arranged in an arc shape, or multiple or all of the first ribs 1145 may be arranged in an arc shape. This application embodiment does not limit this.

[0139] Through its arc-shaped design, the first rib 1145 can more effectively disperse and transmit the lateral impact force to the surrounding structure when under stress, thereby enhancing the overall energy transfer efficiency of the side beam 1140 and helping the first rib 1145 to deform rapidly along the arc-shaped bending direction to absorb energy.

[0140] In some embodiments, at least one end of an arc-shaped first rib 1145 is connected to a first position M of the arc segment 1147, the first position M corresponding to the position where the arc segment 1147 is closest to the battery cell 1200.

[0141] For example, with Figure 6 Taking the orientation shown as an example, the leftmost quadrant point N of the arc segment 1147 is closest to the battery cell 1200. Then, at least one end of the arc-shaped first rib 1145 is connected to the position corresponding to the aforementioned quadrant point N of the arc segment 1147. The corresponding position refers to the position opposite to the aforementioned quadrant point N along the thickness direction of the arc segment 1147.

[0142] Since the first position M corresponds to the closest point between the arc segment 1147 and the battery cell 1200, the arc segment 1147 is most likely to first contact the battery cell 1200 at the first position M and press against the battery cell 1200. When the first sidewall 1141 deforms towards the second sidewall 1142 due to the pressure from the battery cell 1200, this compressive force can be transmitted through the first position M to the first rib 1145, and then the force can be guided and transmitted to other parts of the side beam 1140, especially the lower and outer parts of the side beam 1140, thereby forming a coordinated force distribution, minimizing the concentration of force at the weak point of the first sidewall 1141, preventing the first sidewall 1141 from being damaged due to concentrated hand force, and at the same time, preventing the battery cell 1200 from being damaged and leaking due to concentrated hand force.

[0143] In some embodiments, at least one arc-shaped first rib 1145 has a radius of 20mm-30mm.

[0144] When the side beam 1140 includes a plurality of arc-shaped first ribs 1145, only some of the arc-shaped first ribs 1145 may satisfy the above-mentioned radius range, or all of the arc-shaped first ribs 1145 may satisfy the above-mentioned radius range. This application embodiment does not limit this.

[0145] With this design, the arc-shaped first rib 1145 can ensure that it has a certain curvature to facilitate deformation, without excessively increasing the space occupied by the first rib 1145 between the first side wall 1141 and the second side arm, thus preventing the side beam 1140 from becoming excessively thick.

[0146] In some embodiments, the housing 1100 further includes a mounting beam 1150, which is located on the side of the side beam 1140 opposite to the battery cell 1200 and connected to the second side wall 1142. The mounting beam 1150 is used to connect to an electrical device. The mounting beam 1150 includes a third side wall 1151 and a fourth side wall 1152. In the thickness direction of the base plate 1130, the distance between the third side wall 1151 and the base plate 1130 is smaller than the distance between the fourth side wall 1152 and the base plate 1130, and the stiffness of the third side wall 1151 is greater than the stiffness of the fourth side wall 1152.

[0147] Optionally, the mounting beam 1150 can be bolted to the chassis of vehicle 01.

[0148] The connection between the mounting beam 1150 and the side beam 1140 can be a welding connection or a bolt connection, etc., and this embodiment of the application does not limit this.

[0149] Since the mounting beam 1150 is connected to the second side wall 1142, when the side beam 1140 is subjected to a side collision, the force on the side beam 1140 will also be transmitted to the mounting beam 1150 through the second side wall 1142, and then to other structures of the electrical device, such as the chassis of the vehicle 01. Since the force on the battery device 1000 is usually inclined from the side beam 1140 away from the base plate 1130 towards the base plate 1130, the third side wall 1151 is closer to the part of the battery device 1000 that is subjected to a side impact than the fourth side wall 1152. When the stiffness of the third side wall 1151 is greater than that of the fourth side wall 1152, the fourth side wall 1152 is more likely to deform, thereby absorbing the impact load and reducing the impact load transmitted to the battery cell 1200. The third side wall 1151 can maintain a good connection with other parts of the electrical device, limit the further deformation of the mounting beam 1150 and the side beam 1140, and protect the battery cell 1200.

[0150] As can be seen, the above design of the mounting beam 1150 enables it to better withstand and transmit collision loads from the vehicle body, and forms a coherent and highly rigid force transmission system with the side beam 1140, thereby better reducing the collision loads transmitted to the battery cell 1200 and protecting the battery cell 1200.

[0151] Similarly, there are multiple ways to achieve a stiffness greater than that of the fourth sidewall 1152.

[0152] One approach is to have the average thickness of the third sidewall 1151 greater than the average thickness of the fourth sidewall 1152.

[0153] For example, in some embodiments, the average thickness of the third sidewall 1151 is 3mm-5mm.

[0154] Accordingly, the average thickness of the fourth sidewall 1152 should be less than the average thickness of the third sidewall 1151.

[0155] Optionally, the average thickness of the third sidewall 1151 is 5 mm, and the average thickness of the fourth sidewall 1152 is 3 mm.

[0156] By optimizing the thickness range of the third sidewall 1151, the connection point between the mounting beam 1150 and the electrical device has sufficient strength and stability, without excessively increasing the weight of the mounting beam 1150.

[0157] The thickness of the third sidewall 1151 can be uniform or uneven at various locations. Similarly, the thickness of the fourth sidewall 1152 can be uniform or uneven at various locations.

[0158] Another way to achieve a stiffness of the third sidewall 1151 that is less than that of the fourth sidewall 1152 is to have a material with an elastic modulus greater than that of the material of the fourth sidewall 1152.

[0159] In this embodiment, the third sidewall 1151 and the fourth sidewall 1152 are made of different materials. By selecting materials with different elastic moduli, the stiffness design effect of the hanging beam 1150 being weak at the top and strong at the bottom can be achieved by selecting materials. Here, "top" refers to the part away from the bottom plate 1130, and "bottom" refers to the part close to the bottom plate 1130.

[0160] It is understandable that the first and second implementation methods mentioned above can be used simultaneously or separately to ultimately achieve the effect of controlling the stiffness of the third sidewall 1151 to be less than the stiffness of the fourth sidewall 1152.

[0161] The above scheme achieves the effect of upper-weak and lower-strong stiffness design of the 1150 load-bearing beam through structural design and / or material selection. The structure is simple and the process is reliable.

[0162] In some embodiments, the mounting beam 1150 further includes a second partition 1153, which is disposed between the third side wall 1151 and the fourth side wall 1152 and divides the space between the third side wall 1151 and the fourth side wall 1152 into a plurality of second cavities 1154.

[0163] In some embodiments, the two sides of the second rib 1153 may be connected to the third sidewall 1151 and the fourth sidewall 1152 respectively, so that force can be transmitted between the third sidewall 1151 and the fourth sidewall 1152.

[0164] In some embodiments, the second rib 1153 can also be bent so that its two sides are simultaneously connected to different positions of the third sidewall 1151 or different positions of the fourth sidewall 1152, thereby allowing force to be transmitted between different positions of the third sidewall 1151 or different positions of the fourth sidewall 1152.

[0165] Furthermore, the shape, size, material selection, and connection position of each second rib 1153 can be set independently without being related to each other, and this application embodiment does not impose any restrictions on this.

[0166] By setting a second rib 1153 inside the mounting beam 1150 to form a second cavity 1154, the rigidity of the mounting beam 1150 itself can be improved, making it safer in connecting electrical devices and resisting lateral collisions, and preventing the mounting beam 1150 from becoming a weak point in force transmission.

[0167] Figure 7 This is a schematic diagram of the structure of the top cover in some embodiments of this application. Figure 8 for Figure 7 A magnified structural diagram at point C. (See diagram below.) Figure 7 and Figure 8 As shown, in some embodiments, the housing 1100 further includes a top cover 1160 and a reinforcing member 1170. The top cover 1160 is disposed opposite to the bottom plate 1130, and the battery cell 1200 is disposed between the bottom plate 1130 and the top cover 1160. The reinforcing member 1170 is disposed on the side of the top cover 1160 away from the bottom plate 1130, and along the thickness direction of the bottom plate 1130, the projection of the reinforcing member 1170 on the top cover 1160 at least partially overlaps with the projection of the side beam 1140 on the top cover 1160.

[0168] The reinforcing member 1170 can be configured to fit the shape of the side of the top cover 1160 opposite to the bottom plate 1130, thereby fitting the top cover 1160 more closely and ensuring that the reinforcement member 1170 does not excessively increase the volume of the battery device 1000.

[0169] Optionally, the reinforcing member 1170 is plate-shaped and is connected to the upper cover 1160 by welding, and / or bonding, and / or bolting.

[0170] In the event of a side collision, the battery device 1000 typically begins to bear force from the part of the top cover 1160 near the side beam 1140, and then the force is transmitted to the side beam 1140. This application improves the local stiffness of the top cover 1160 in the area where the force begins to be borne by placing the reinforcing member 1170 on the side of the top cover 1160 away from the bottom plate 1130, and making the projection of the reinforcing member 1170 on the top cover 1160 at least partially overlap with the projection of the side beam 1140 on the top cover 1160. This directly increases the local stiffness of the top cover 1160 in the area where the force begins to be borne, reduces the probability of the top cover 1160 being severely deformed and damaged, and provides more reliable protection for the battery cell 1200.

[0171] Optionally, the strength of the reinforcing member 1170 is greater than the strength of the cover 1160.

[0172] There are several ways to make the strength of the reinforcing member 1170 greater than that of the top cover 1160.

[0173] In some embodiments, the yield strength of the material of the reinforcing member 1170 is greater than the yield strength of the material of the cover 1160.

[0174] In some embodiments, the thickness of the reinforcing member 1170 is greater than the thickness of the cover 1160.

[0175] In some embodiments, the reinforcing member 1170 includes a reinforcing plate 1171 and a reinforcing rib 1172. The reinforcing plate 1171 is connected to the upper cover 1160, and the reinforcing rib 1172 is connected to the reinforcing plate 1171 and protrudes from one side of the reinforcing plate 1171.

[0176] For example, the reinforcing rib 1172 may be a stamped feature on the reinforcing plate 1171, or it may be a feature connected to the reinforcing plate 1171 by means of welding or other methods. This application embodiment does not limit this.

[0177] The above three implementation methods achieve the effect that the strength of the reinforcing member 1170 is greater than that of the top cover 1160 by selecting the material, thickness and structural design of the reinforcing member 1170, thereby enhancing the ability of the reinforcing member 1170 to absorb and resist impact forces, better absorb impact loads, protect the top cover 1160, and thus protect the battery cell 1200.

[0178] It is understandable that the above three methods can be combined in several ways, or applied separately to the reinforcing member 1170 to improve the strength of the reinforcing member 1170.

[0179] Typically, when the battery device 1000 is used in an electrical device, the middle part of the top cover 1160 of the battery device 1000, which faces the side beam 1140, is more likely to be squeezed and deformed.

[0180] To reduce the coverage area of ​​the reinforcing member 1170, thereby reducing the cost and weight of the battery device 1000, and to provide more precise reinforcement and protection for the battery device 1000, such as... Figure 7 As shown, in some embodiments, along the thickness direction of the base plate 1130, the projection of the side beam 1140 onto the top cover 1160 includes a first region, which is the projection area of ​​the middle half of the side beam 1140 along its own length direction onto the top cover 1160; the projection area of ​​the reinforcement 1170 overlapping with the side beam 1140 includes at least the first region.

[0181] Since the projected area of ​​the overlapping of the top cover 1160 and the side beam 1140 includes at least the first area, and this first area basically corresponds to the middle part of the top cover 1160 facing the side beam 1140, the reinforcement 1170 can be precisely placed in the area most prone to collision and deformation through this arrangement, thereby precisely reinforcing the top cover 1160 while reducing unnecessary weight increase of the battery device 1000.

[0182] like Figure 8 As shown, in some embodiments, the reinforcing member 1170 includes a reinforcing plate 1171, on which a flow channel 1173 is provided. The reinforcing plate 1171 is connected to the upper cover 1160, and the flow channel 1173 is used for liquid to flow out from between the reinforcing member 1170 and the upper cover 1160.

[0183] In some embodiments, the guide groove 1173 is a stamped groove on the reinforcing plate 1171, with the opening of the stamped groove facing the upper cover 1160.

[0184] In this way, the flow channel 1173 can not only create a gap between the reinforcing plate 1171 and the top cover 1160 to allow liquid to flow out, but the side wall of the flow channel 1173 can also act as a reinforcing rib 1172 to strengthen the reinforcing member 1170.

[0185] During the manufacturing and use of the battery device 1000, when there is liquid on the top cover 1160, the liquid can flow out from between the reinforcing member 1170 and the top cover 1160 through the guide groove 1173, preventing the liquid from accumulating on the top cover 1160 for a long time or between the top cover 1160 and the reinforcing member 1170 and causing local corrosion.

[0186] For example, during the manufacturing process of the battery device 1000, after the reinforcing member 1170 is connected to the top cover 1160, the top cover 1160 and the reinforcing member 1170 as a whole need to be electrophoretically treated to form an anti-corrosion layer on the top cover 1160 and the reinforcing member 1170. During this process, the electrophoretic liquid will enter between the top cover 1160 and the reinforcing member 1170, as well as at the edge of the reinforcing member 1170. The electrophoretic liquid in these parts can flow out through the guide groove 1173, thereby preventing the electrophoretic liquid from accumulating in the aforementioned parts for a long time and causing local corrosion to the top cover 1160 and the reinforcing member 1170.

[0187] In summary, this embodiment of the application sets the sidewalls of the side beam 1140 with a stiffness distribution that is stronger on the outside and weaker on the inside. This allows the second sidewall 1142, located on the outer side, to effectively resist external forces and reduce the risk of damage to the side beam 1140. The first sidewall 1141, on the other hand, allows for a certain degree of controllable deformation, thereby absorbing collision energy and reducing the damage caused by impact to the battery cell 1200. Therefore, the battery device 1000 can reduce the possibility of the battery cell 1200 being squeezed and deformed due to a side impact without increasing the overall thickness of the side beam 1140, thus improving the safety of the battery device 1000.

[0188] This application provides an electrical device, including the battery device 1000 in any of the foregoing embodiments.

[0189] Because the battery device 1000 has good side impact resistance, lightweight characteristics and high safety, electrical devices containing the battery device 1000 can achieve a higher level of collision safety, lightweight and higher overall safety and reliability.

[0190] 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, characterized in that, Includes a housing and individual battery cells housed within the housing; The housing includes a bottom plate and side beams located on opposite sides of the bottom plate, with the battery cell located between the two side beams; The side beam includes a first side wall and a second side wall, the second side wall being disposed on the side of the first side wall away from the battery cell, and the stiffness of the first side wall at least in a portion of the position being less than the stiffness of the second side wall. The first sidewall includes an arc-shaped segment, the center of which is located on the side of the first sidewall opposite to the battery cell.

2. The battery device as claimed in claim 1, characterized in that: The average thickness of the first sidewall is less than the average thickness of the second sidewall; and / or, The elastic modulus of the material of the first sidewall is less than that of the material of the second sidewall.

3. The battery device as claimed in claim 1, characterized in that: The first sidewall is located at the point where it is closest to the battery cell in the arc-shaped segment.

4. The battery device as claimed in claim 1, characterized in that: The average thickness of the first sidewall is 1.8 mm to 2.8 mm; and / or, The average thickness of the second sidewall is 2mm-4mm.

5. The battery device as claimed in claim 1, characterized in that: The radius of the arc segment is 35mm-45mm.

6. The battery device as claimed in claim 1, characterized in that: The side beam also includes a first partition bar connecting the first side wall and the second side wall, the first partition bar dividing the space between the first side wall and the second side wall into a plurality of first cavities arranged along the thickness direction of the bottom plate; The plurality of first cavities include a bottom cavity, which is the first cavity closest to the bottom plate, and the average thickness of the cavity wall of the bottom cavity is greater than the average thickness of the cavity walls of the other first cavities.

7. The battery device as claimed in claim 6, characterized in that: The average thickness of the first rib is 1.8mm-2.8mm.

8. The battery device as claimed in claim 6, characterized in that: At least one of the first ribs is arc-shaped.

9. The battery device as claimed in claim 8, characterized in that: At least one end of the first rib, which is arc-shaped, is connected to a first position of the arc segment, the first position corresponding to the position where the arc segment is closest to the battery cell.

10. The battery device as claimed in claim 8, characterized in that: At least one of the first ribs, which is arc-shaped, has a radius of 20mm-30mm.

11. The battery device according to any one of claims 1-10, characterized in that: The enclosure also includes a mounting beam, which is located on the side of the side beam away from the battery cell and connected to the second side wall. The mounting beam is used to connect to the electrical device. The mounting beam includes a third sidewall and a fourth sidewall. In the thickness direction of the base plate, the distance between the third sidewall and the base plate is less than the distance between the fourth sidewall and the base plate, and the stiffness of the third sidewall is greater than the stiffness of the fourth sidewall.

12. The battery device as claimed in claim 11, characterized in that: The average thickness of the third sidewall is greater than the average thickness of the fourth sidewall; and / or, The elastic modulus of the material of the third sidewall is greater than that of the material of the fourth sidewall.

13. The battery device as claimed in claim 11, characterized in that: The average thickness of the third sidewall is 3mm-5mm.

14. The battery device according to any one of claims 1-10, characterized in that: The enclosure also includes a top cover and reinforcing components; The upper cover is disposed opposite to the bottom plate, and the battery cell is disposed between the bottom plate and the upper cover; The reinforcing member is located on the side of the upper cover away from the bottom plate, and along the thickness direction of the bottom plate, the projection of the reinforcing member on the upper cover at least partially overlaps with the projection of the side beam on the upper cover.

15. The battery device as claimed in claim 14, characterized in that: Along the thickness direction of the base plate, the projection of the side beam on the top cover includes a first region, which is the projection region of the middle 1 / 2 segment of the side beam along its own length direction on the top cover; The projected area where the reinforcing member overlaps with the side beam includes at least the first area.

16. The battery device as claimed in claim 14, characterized in that: The strength of the reinforcing member is greater than the strength of the top cover.

17. The battery device as claimed in claim 16, characterized in that: The yield strength of the reinforcing member is greater than the yield strength of the upper cover; and / or, The thickness of the reinforcing member is greater than the thickness of the upper cover; and / or, The reinforcing member includes a reinforcing plate and a reinforcing rib. The reinforcing plate is connected to the upper cover, and the reinforcing rib is connected to the reinforcing plate and protrudes from one side of the reinforcing plate.

18. The battery device as claimed in claim 14, characterized in that: The reinforcing member includes a reinforcing plate with a flow channel. The reinforcing plate is connected to the upper cover, and the flow channel is used for liquid to flow out from between the reinforcing member and the upper cover.

19. An electrical appliance, characterized in that: Includes the battery cell as described in any one of claims 1-18.

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