Battery devices and electrical appliances

Abstract

This application relates to the field of battery device technology. This application provides a battery device and an electrical device. The battery device includes a housing, a beam, a battery cell assembly, a heat exchange structure, and multiple reinforcing supports. The housing has a mounting cavity, the beam is located within the mounting cavity and connected to the cavity wall, the battery cell assembly is located within the mounting cavity, and the heat exchange structure is located within the mounting cavity for heat exchange with the battery cell assembly. The heat exchange structure includes a connector that passes through the beam and housing along a first direction, and the connector has an interface that exposes the outer surface of the housing. Multiple reinforcing supports are located within the mounting cavity, connecting the beam and the cavity wall. By providing multiple reinforcing supports, this application can increase the structural strength of the beam and housing assembly, improve the beam's bending and torsional stiffness, and enhance the housing's resistance to battery cell assembly expansion deformation, thereby reducing the beam's deformation and lowering the risk of cracking in the beam and housing.

Description

Technical Field

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

[0002] The battery unit includes a housing, beams, individual battery cells, and a heat exchange structure. All components are housed within the housing. The beams connect to the inner surface of the housing, while the joints of the heat exchange structure pass through both the beams and the housing, protruding from the outer surface of the housing. The placement of these joints reduces the connection strength between the beams and the housing. Since the housing is attached to the electrical appliance, the connection between the beams and the housing is broken by the joints. Over time, this can increase the deformation of the beams, and may even lead to cracking of both the beams and the housing. Utility Model Content

[0003] In view of this, embodiments of this application provide a battery device and an electrical device that can improve the ability of the battery device's housing to resist the expansion and deformation of individual battery cells, thereby reducing the deformation of the battery device's beam.

[0004] Therefore, according to a first aspect of the embodiments of this application, a battery device is provided, comprising: a housing with an installation cavity inside; a beam disposed in the installation cavity and connected to the cavity wall; a battery cell assembly disposed in the installation cavity; a heat exchange structure disposed in the installation cavity for exchanging heat with the battery cell assembly, the heat exchange structure including a joint, which passes through the beam and the housing along a first direction, the joint having an interface exposed on the outer surface of the housing; and a plurality of reinforcing brackets disposed in the installation cavity, the reinforcing brackets connecting the beam and the cavity wall of the installation cavity.

[0005] The battery device provided in this application includes a housing, a beam, a battery cell assembly, a heat exchange structure, and multiple reinforcing supports.

[0006] The enclosure contains an installation cavity, in which the beam, battery cell assembly, heat exchange structure, and multiple reinforcing supports are housed. In other words, the enclosure serves as the mounting carrier for the beam, battery cell assembly, heat exchange structure, and multiple reinforcing supports, and has the function of installing and fixing the beam, battery cell assembly, heat exchange structure, and multiple reinforcing supports.

[0007] This application incorporates multiple reinforcing supports, with each support connecting the beam to the cavity wall of the mounting chamber. In other words, the reinforcing supports connect to both the beam and the cavity wall. These supports reinforce the beam and the housing, increasing the structural strength of the assembled beam and housing. They also provide a support path for the beam, enhancing the load transfer between the beam and housing, improving the support for the beam, increasing its bending and torsional stiffness, and improving the housing's resistance to expansion and deformation of individual battery cells. This reduces beam deformation, thereby lowering the risk of cracking in the beam and housing, extending the battery device's lifespan, and improving the safety and reliability of the battery device.

[0008] Optionally, the plurality of reinforcing brackets include a first reinforcing bracket, the connector being located on the periphery of the battery cell assembly, and the connector being located between the first reinforcing bracket and the bottom plate of the housing.

[0009] The various types of reinforcing supports are classified, including a first reinforcing support, which connects the beam and the cavity wall of the mounting cavity.

[0010] The first reinforcing bracket will not interfere with the joint, making full use of the installation space at the bottom of the mounting cavity. This reduces the assembly difficulty of the joint with the housing and beam, and also reduces the installation difficulty of the reinforcing bracket. In addition, the first reinforcing bracket is located above the joint, and it protects the joint, preventing external forces or other components within the battery device from directly sinking and crushing the joint. This helps improve the reliability and effectiveness of the assembly of the heat exchange structure with the housing and beam.

[0011] Optionally, the first reinforcing bracket includes: a first plate body connected to the beam body; a second plate body connected to the cavity wall of the mounting cavity; an inclined plate connected between the first plate body and the second plate body; along a second direction, the connection between the inclined plate and the first plate body is closer to the joint than the connection between the inclined plate and the second plate body, and the second direction is different from the first direction.

[0012] The first reinforcing bracket includes a first plate, a second plate, and an inclined plate. Along the second direction, the connection between the inclined plate and the first plate is closer to the joint than the connection between the inclined plate and the second plate. The second direction differs from the first direction. The first plate, the second plate, and the inclined plate enclose a trapezoidal structure, giving the first reinforcing bracket a stable structural state and good resistance to deformation.

[0013] The expansion force of the battery cell assembly is transmitted from the beam to the first plate. The force is then transmitted to the cavity wall of the mounting cavity via the inclined plate in a direction away from the joint, so as to guide the force around the stress concentration area where the joint is located. In this way, the deformation of the beam can be reduced, and the risk of cracking of the beam and the box can be reduced.

[0014] Optionally, the area where the second plate overlaps with the cavity wall of the mounting cavity is larger than the area where the first plate overlaps with the beam.

[0015] The area where the second plate overlaps with the cavity wall of the mounting cavity is larger than the area where the first plate overlaps with the beam. In other words, the connection area between the first plate and the beam is relatively small, while the connection area between the second plate and the cavity wall of the mounting cavity is relatively large. This satisfies the need for effective connection between the first plate and the beam, as well as between the second plate and the box, while reducing the material input of the first reinforcing bracket. This helps to reduce the production cost and weight of the product.

[0016] The connection area between the first plate and the beam is relatively small, which can concentrate the expansion force to the first reinforcing support and improve the force transmission efficiency.

[0017] The larger connection area between the second plate and the cavity wall of the mounting cavity can help distribute the load. The larger connection area can improve the bending and torsional resistance of the first reinforcing bracket and enhance the support stiffness.

[0018] Optionally, one end of the inclined plate is connected to the side of the first plate away from the joint, and the other end of the inclined plate is connected to the side of the second plate away from the joint.

[0019] The first plate, the second plate, the inclined plate, the beam, and the box body work together to form triangular support structures on both sides of the joint, thereby adjusting the force transmission path and enhancing the support effect of the first reinforcing bracket.

[0020] Optionally, the battery assembly further includes: a first fastener, through which the first plate and the beam are connected; a second fastener, through which the second plate and the cavity wall of the mounting cavity are connected; the first fastener passes through the first plate and the beam, and along the direction from the second plate to the first plate, the first fastener has opposing first and second outer surfaces, the first outer surface being located between the first and second plates, and the second outer surface being located within the beam; and / or the second fastener passes through the second plate and the cavity wall of the mounting cavity, and along the direction from the second plate to the first plate, the second fastener has opposing third and fourth outer surfaces, the outer surface of the housing facing away from the second plate is the fifth outer surface of the housing, the third outer surface is located between the fifth outer surface and the second plate, the fourth outer surface is located between the first and second plates, and the second fastener does not penetrate the housing. The battery assembly further includes the first fastener and the second fastener. The first fastener is used to connect the first plate and the beam. The second fastener is used to connect the second plate and the cavity wall of the mounting cavity.

[0021] Along the direction from the second plate to the first plate, the first fastener has opposing first and second outer surfaces, and the second fastener has opposing third and fourth outer surfaces. The outer surface of the housing facing away from the second plate is the fifth outer surface of the housing.

[0022] When the first fastener passes through the first plate and the beam, with the first outer surface located between the first plate and the second plate and the second outer surface located inside the beam, the first fastener does not penetrate the beam while meeting the usage requirements of connecting the first plate and the beam. This reduces the material input for sealing the beam, lowers the sealing difficulty, and simplifies the sealing structure of the battery device.

[0023] When the second fastener passes through the cavity wall of the second plate and the mounting cavity, the third outer surface is located between the fifth outer surface and the second plate, and the fourth outer surface is located between the first plate and the second plate. When the second fastener does not penetrate the housing, while meeting the usage requirements of the second fastener connecting the second plate and the cavity wall of the mounting cavity, it can prevent the second fastener from penetrating the housing. That is, the second fastener will not be visible from the outside of the housing and will be hidden inside the housing. This reduces the material input used to seal the outer surface of the housing and the connection between the second fastener, which helps to reduce the sealing difficulty and simplifies the sealing structure of the battery device.

[0024] Optionally, the first reinforcing bracket further includes at least one reinforcing rib, which is connected between the first plate, the second plate, and the inclined plate.

[0025] The first reinforcing support includes a first plate, a second plate, an inclined plate, and at least one reinforcing rib, which connects the first plate, the second plate, and the inclined plate. The at least one reinforcing rib enhances the rigidity of the inclined plate, reduces the probability of lateral bending, distributes the pressure borne by the inclined plate more evenly across the first and second plates, avoids stress concentration on the inclined plate, and further enhances the bending resistance of the first reinforcing support.

[0026] Optionally, the multiple reinforcing supports include a second reinforcing support, with the beam located between the second reinforcing support and the bottom plate of the box body.

[0027] The various types of reinforcing supports are categorized, including a second reinforcing support that connects the beam and the cavity wall of the mounting chamber. Along the height direction of the box body (i.e., the second direction), the second reinforcing support is located above the beam. This second reinforcing support strengthens both the beam and the box body, increasing the structural strength of the assembled beam and box body.

[0028] Optionally, the battery device further includes: a reinforcing plate located on the outer surface of the housing, a first portion of the reinforcing plate being disposed opposite to the second reinforcing bracket; a third fastener connecting the reinforcing plate, the housing, and the second reinforcing bracket; and a first sealing portion for sealing the connection between the third fastener and the reinforcing plate.

[0029] The battery assembly also includes a reinforcing plate, a third fastener, and a first sealing part. The reinforcing plate is located on the outside of the housing, and the second reinforcing bracket is located on the inside of the housing. The housing wall is sandwiched between the second reinforcing bracket and the reinforcing plate. The third fastener connects the reinforcing plate, the housing, and the second reinforcing bracket. The preload applied by the third fastener effectively clamps the housing wall of the housing with the reinforcing plate and the second reinforcing bracket.

[0030] The expansion force of the beam is transmitted to the box body through the second reinforcing bracket, and then to the reinforcing plate on the outside of the box body through the third fastener. This increases the friction of the connecting surface and reduces the probability of the second reinforcing bracket loosening or falling off.

[0031] The first sealing part serves to prevent dust and water, preventing conductive media from entering the battery device through the connection between the third fastener and the reinforcing plate. This avoids short circuits and leakage, providing structural support for the safety and reliability of the battery device.

[0032] Optionally, the second part of the reinforcing plate is disposed opposite to the beam; the battery device further includes: a fourth fastener, the fourth fastener connecting the reinforcing plate, the housing and the beam, the side of the fourth fastener away from the reinforcing plate located in the beam; and a second sealing part, the second sealing part used to seal the connection between the fourth fastener and the reinforcing plate.

[0033] The second part of the reinforcing plate is positioned opposite the beam, meaning the reinforcing plate is located on the outside of the box body, the beam is located on the inside of the box body, and the box wall is sandwiched between the beam and the reinforcing plate. A fourth fastener connects the reinforcing plate, the box body, and the beam, and the preload applied by the fourth fastener effectively clamps the box wall between the reinforcing plate and the beam.

[0034] The expansion force of the beam is transmitted to the reinforcing plate on the outside of the box through the fourth fastener. The expansion force is shared by the second reinforcing bracket and the reinforcing plate, which can enhance the rigid constraint, reduce the bending moment and shear force borne by the box, and play a role in protecting the box.

[0035] The second sealing part is used to seal the connection between the fourth fastener and the reinforcing plate. The second sealing part has the functions of dustproofing and waterproofing, preventing conductive media from entering the interior of the battery device through the connection between the fourth fastener and the reinforcing plate, thus avoiding short circuits and leakage, and providing structural support for the safety and reliability of the battery device.

[0036] Optionally, the second reinforcing bracket includes: a third plate body connected to the beam body; and a fourth plate body connected to the third plate body and the cavity wall of the mounting cavity, wherein the third plate body is located between the fourth plate body and the beam body.

[0037] The second reinforcing bracket includes a third plate and a fourth plate. The third plate is connected to the beam, and the fourth plate is connected to the wall of the mounting cavity. The third and fourth plates are L-shaped. When the beam warps upward due to force, the third and fourth plates work together to press the beam downward, enhancing the local rigidity of the beam and reducing its deformation.

[0038] Optionally, there may be multiple second reinforcing supports, which are arranged at intervals along a third direction, which is different from the first direction.

[0039] Along the third direction, multiple second reinforcing supports are arranged at intervals. These multiple second reinforcing supports share the load of the beam, so that the expansion force of the beam is evenly distributed to the multiple second reinforcing supports. This can achieve force uniformity, prevent local overload, and provide structural support to reduce the probability of cracking of the beam and box.

[0040] Optionally, at least a portion of the reinforcing bracket is an insulated reinforcing bracket.

[0041] At least a portion of the reinforcing bracket is an insulated reinforcing bracket; that is, a portion of the reinforcing bracket is an insulated reinforcing bracket, or all of the reinforcing bracket is an insulated reinforcing bracket. The reinforcing bracket not only strengthens the beam and the box, but also has insulating properties, which can block the electrical conduction path and prevent short circuits and leakage. This reduces the material input for additional insulation structures in the battery device and lowers the production cost of the battery device.

[0042] Optionally, the battery device also includes a mounting bracket that connects to the outer surface of the housing.

[0043] The battery unit also includes a mounting bracket that connects to the outer surface of the housing. The housing is hung inside the electrical device via the mounting bracket, and the mounting bracket is able to withstand vibrations and impacts from the outside.

[0044] Alternatively, the connector is located between the battery cell assembly and the mounting bracket.

[0045] The positional relationship between the connector, battery cell assembly, and mounting bracket is refined. The connector is located between the battery cell assembly and the mounting bracket. The mounting bracket serves to isolate the heat exchange structure of the connector, protect the connector, and prevent it from being impacted by external forces. It also has the function of compact layout, allowing the battery device to be more flattened.

[0046] Optionally, there are multiple connectors and multiple first reinforcing brackets. The multiple connectors are divided into at least one connector group. Each connector group is located between the bottom plate of the box and at least one first reinforcing bracket. The connector group includes multiple connectors. When there are multiple connector groups, a portion of the multiple connector groups are located on the first side of the battery cell assembly, and another portion of the multiple connector groups are located on the second side of the battery cell assembly.

[0047] Multiple joints are divided into at least one joint group, each joint group comprising multiple joints, and each joint group being located between the bottom plate of the enclosure and at least one first reinforcing bracket. The multiple first reinforcing brackets and at least one joint group cooperate to enhance the supporting function of the multiple reinforcing brackets.

[0048] When there are multiple connector groups, some of the connector groups are located on the first side of the battery cell assembly, and another part of the connector groups are located on the second side of the battery cell assembly. The positioning of the multiple connector groups can facilitate heat exchange between the battery cell assembly and multiple sides of the battery cell assembly, which can uniformly reduce the temperature of the battery cell assembly, which is beneficial to extending the service life of the battery cell assembly and improving the safety of the battery cell assembly.

[0049] A second aspect of this application provides an electrical device, including the battery device described in the first aspect. Since the electrical device includes the battery device from the first aspect of this application, it possesses all the beneficial technical effects of the battery device, which will not be elaborated further here.

[0050] Additional aspects and advantages of embodiments of this application will be set forth in the following description, in part will be obvious from the description or may be learned by practice of embodiments of this application. Attached Figure Description

[0051] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0052] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0053] Figure 2 This is a schematic diagram of the first part of the battery device in some embodiments of this application;

[0054] Figure 3 This is a schematic diagram of the second part of the battery device in some embodiments of this application;

[0055] Figure 4 for Figure 3 A partial enlarged view of point A of the battery device shown;

[0056] Figure 5 This is a schematic diagram of the third part of the battery device in some embodiments of this application;

[0057] Figure 6 for Figure 5 A partial enlarged view of section B of the battery device shown;

[0058] Figure 7 This is a schematic diagram of the structure of the first reinforcing bracket, the first fastener, and the second fastener in some embodiments of this application;

[0059] Figure 8 This is a schematic diagram of the structure of the second reinforcing bracket and reinforcing plate in some embodiments of this application.

[0060] Figure label:

[0061] 1 vehicle, 10 controllers, 11 motors;

[0062] 2 Battery assembly, 21 Housing, 211 Mounting cavity, 212 Housing bottom plate, 213 Fifth outer surface, 22 Beam, 23 Battery cell assembly, 231 First side of battery cell assembly, 232 Second side of battery cell assembly, 24 Heat exchange structure, 241 Connector, 242 Interface, 243 Connector assembly, 244 Water cooling plate, 25 Reinforcing bracket, 25a First reinforcing bracket, 25b Second reinforcing bracket, 251 First plate, 252 Second plate, 253 Inclined plate, 25 4. Reinforcing rib; 255. Third plate; 256. Fourth plate; 261. First fastener; 2611. First outer surface; 2612. Second outer surface; 262. Second fastener; 2621. Third outer surface; 2622. Fourth outer surface; 263. Third fastener; 264. First sealing part; 265. Fourth fastener; 266. Second sealing part; 267. Hanger; 268. Sixth fastener; 27. Reinforcing plate; 271. First part of reinforcing plate; 272. Second part of reinforcing plate. Detailed Implementation

[0063] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0064] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0065] The following reference Figures 1 to 8 This application describes battery devices and power-consuming devices according to some embodiments.

[0066] In related technologies, the battery pack enclosure is suspended inside the electrical appliance. The battery pack includes an enclosure, beams, individual battery cells, and a heat exchange structure. All components—including the individual battery cells, beams, and heat exchange structure—are housed within the enclosure, with the beams connected to the inner surface of the enclosure. Because the individual battery cells tend to expand cyclically during charging and discharging, the cumulative deformation is transferred to the beams within the enclosure. While the beams' inherent rigidity can resist some of the deformation, the expansion force is also transferred to the enclosure, where external fasteners provide resistance to deformation. The heat exchange structure's joints penetrate the beams and enclosure, protruding from the outer surface of the enclosure to meet the requirement of the joint's interface being exposed. However, this placement of the joints disrupts the connection between the beams and enclosure, resulting in a weak connection. Consequently, when the individual battery cells expand, the fasteners and enclosure cannot provide sufficient support to the beams to effectively resist deformation, leading to increased beam deformation and a higher risk of cracking in both the beams and the enclosure.

[0067] It is understandable that the beam has through holes, and the joints pass through these holes. These through holes will become stress concentration points. When the electrical equipment is working, it will generate vibrations, and the through holes in the beam are prone to cracking under long-term vibration.

[0068] Based on the above considerations, in order to reduce the deformation of the beam and the risk of cracking of the beam and the box, this application proposes a battery device 2. The battery device 2 includes a box 21, a beam 22, a battery cell assembly 23, a heat exchange structure 24, and multiple reinforcing supports 25. Any one of the multiple reinforcing supports 25 connects the beam 22 and the cavity wall of the mounting cavity 211. The reinforcing support 25 provides a support path for the beam 22, which can increase the force transmission between the beam 22 and the box 21, improve the support for the beam 22, enhance the bending and torsional stiffness of the beam 22, and improve the ability of the box 21 to resist the expansion and deformation of the battery cell assembly 23. This can reduce the deformation of the beam 22, thereby reducing the risk of cracking of the beam 22 and the box 21.

[0069] The battery device 2 disclosed in this application is used in an electrical device, serving as the power source for the device. 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.

[0070] This application provides an electrical device, which includes a battery device 2. The number of battery devices 2 can be one or more.

[0071] For ease of explanation, the following embodiments use a vehicle 1 as an example of an electrical device. Figure 1 As shown, vehicle 1 includes a controller 10, a motor 11, and a battery device 2. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The battery device 2 is installed inside vehicle 1, and can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 10 and a motor 11. The controller 10 is used to control the battery device 2 to supply power to the motor 11, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0072] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0073] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the battery device 2 according to the first aspect embodiment of this application includes: a housing 21, with a mounting cavity 211 inside the housing 21; a beam 22 disposed in the mounting cavity 211 and connected to the cavity wall of the mounting cavity 211; a battery cell assembly 23 disposed in the mounting cavity 211; a heat exchange structure 24 disposed in the mounting cavity 211, the heat exchange structure 24 being used for heat exchange with the battery cell assembly 23, the heat exchange structure 24 including a connector 241, which passes through the beam 22 and the housing 21 along a first direction, the connector 241 having an interface 242 exposed on the outer surface of the housing 21; and a plurality of reinforcing brackets 25 disposed in the mounting cavity 211, the reinforcing brackets 25 connecting the beam 22 and the cavity wall of the mounting cavity 211.

[0074] The battery device 2 disclosed in this application includes a housing 21, a beam 22, a battery cell assembly 23, a heat exchange structure 24, and multiple reinforcing supports 25.

[0075] The housing 21 has an installation cavity 211 inside, where the beam 22, battery cell assembly 23, heat exchange structure 24 and multiple reinforcing brackets 25 are all located. That is, the housing 21 serves as the installation carrier for the beam 22, battery cell assembly 23, heat exchange structure 24 and multiple reinforcing brackets 25, and has the function of installing and fixing the beam 22, battery cell assembly 23, heat exchange structure 24 and multiple reinforcing brackets 25.

[0076] The beam 22 is connected to the cavity wall of the mounting cavity 211 of the box body 21.

[0077] The heat exchange structure 24 is used for heat exchange with the battery cell assembly 23. The heat exchange structure 24 includes a connector 241 with an interface 242. Along a first direction, the connector 241 passes through the beam 22 and the housing 21. The interface 242 of the connector 241 is exposed on the outer surface of the housing 21, that is, the interface 242 can be seen from the outer surface of the housing 21. The heat exchange medium can flow into and out of the heat exchange structure 24 through the interface 242 to exchange heat with the battery cell assembly 23 and reduce the temperature of the battery cell assembly 23.

[0078] Battery cell assembly 23 includes at least one battery cell. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Battery cell assembly 23 is typically formed by arranging multiple battery cells.

[0079] The interior of the housing 21 forms a mounting cavity 211, which is used to house components such as the beam 22, battery cell assembly 23, heat exchange structure 24, and multiple reinforcing supports 25. The mounting cavity 211 can be a sealed cavity or an unsealed cavity.

[0080] The battery cell may include lithium-ion secondary battery, lithium-ion primary battery, lithium-sulfur battery, sodium lithium-ion battery, sodium-ion battery or magnesium-ion battery, etc., and the embodiments of this application are not limited to this.

[0081] This application provides multiple reinforcing brackets 25, with each of the reinforcing brackets 25 connected to the beam 22 and the cavity wall of the mounting cavity 211. In other words, the reinforcing bracket 25 connects to both the beam 22 and the cavity wall of the mounting cavity 211. These multiple reinforcing brackets 25 strengthen the beam 22 and the housing 21, increasing the structural strength of the assembly. The reinforcing brackets 25 provide a support path for the beam 22, increasing the force transmission between the beam 22 and the housing 21, enhancing the support for the beam 22, improving the bending and torsional stiffness of the beam 22, and increasing the housing 21's ability to resist the expansion and deformation of the battery cell assembly 23. This reduces the deformation of the beam 22, thereby lowering the risk of cracking in the beam 22 and the housing 21, which is beneficial for extending the service life of the battery device 2 and improving the safety and reliability of the battery device 2.

[0082] It is understandable that there are multiple reinforcing brackets 25, which can increase the contact area between the reinforcing brackets 25 and the box body 21 and the beam body 22, and increase the contact angle between the reinforcing brackets 25 and the box body 21 and the beam body 22, which is beneficial to improving the structural strength of the assembly of the box body 21 and the beam body 22.

[0083] For example, the beam 22 is integrally connected to the box 21.

[0084] For example, the beam 22 and the box 21 can be detachably connected.

[0085] Exemplarily, the housing 21 includes a main body and side beams. The side beams are located within the main body and connect the beam 22 and the main body. A joint 241 of the heat exchange structure 24 passes through the beam 22, the side beams, and the main body, with the interface 242 of the joint 241 exposed on the outer surface of the main body. A reinforcing bracket 25 connects the beam 22 and the side beams. Alternatively, the reinforcing bracket 25 connects the beam 22 and the main body. Alternatively, a portion of the multiple reinforcing brackets 25 connects the beam 22 and the side beams, while another portion connects the beam 22 and the main body.

[0086] For example, the housing 21 includes a housing body, which does not include side beams. The beam 22 is connected to the housing body. The joint 241 of the heat exchange structure 24 passes through the beam 22 and the housing body, and the interface 242 of the joint 241 is exposed on the outer surface of the housing body. The reinforcing bracket 25 connects the beam 22 and the housing body.

[0087] In some embodiments of this application, such as Figure 3 , Figure 4 and Figure 7 As shown, the plurality of reinforcing brackets 25 include a first reinforcing bracket 25a, a connector 241 located on the periphery of the battery cell assembly 23, and the connector 241 located between the first reinforcing bracket 25a and the bottom plate 212 of the housing 21.

[0088] Among them, the types of multiple reinforcing brackets 25 are classified, such that the multiple reinforcing brackets 25 include a first reinforcing bracket 25a, which connects the beam body 22 and the cavity wall of the mounting cavity 211.

[0089] The housing 21 includes a bottom plate 212, and the connector 241 is located between the first reinforcing bracket 25a and the bottom plate 212 of the housing 21. The first reinforcing bracket 25a does not interfere with the connector 241, can make full use of the installation space at the bottom of the mounting cavity 211, can reduce the assembly difficulty of the connector 241 with the housing 21 and the beam 22, and can also reduce the installation difficulty of the reinforcing bracket 25. In addition, along the height direction of the housing 21 (that is, the second direction), the first reinforcing bracket 25a is located above the connector 241. The first reinforcing bracket 25a has the function of protecting the connector 241, which can prevent external forces or other components in the battery device 2 from directly sinking and squeezing the connector 241. This is beneficial to improving the reliability and effectiveness of the assembly of the heat exchange structure 24 with the housing 21 and the beam 22, and preventing external forces from directly impacting the area where the connector 241 is located.

[0090] In some embodiments of this application, such as Figure 3 , Figure 4 and Figure 7As shown, the first reinforcing bracket 25a includes: a first plate 251, which is connected to the beam 22; a second plate 252, which is connected to the cavity wall of the mounting cavity 211; and an inclined plate 253, which is connected between the first plate 251 and the second plate 252. Along a second direction, the connection between the inclined plate 253 and the first plate 251 is closer to the joint 241 than the connection between the inclined plate 253 and the second plate 252. The second direction is different from the first direction.

[0091] The first reinforcing bracket 25a includes a first plate 251, a second plate 252, and an inclined plate 253. The first plate 251 is connected to the beam 22, the second plate 252 is connected to the cavity wall of the mounting cavity 211, the first plate 251 and the second plate 252 are arranged at intervals, and the inclined plate 253 is connected between the first plate 251 and the second plate 252.

[0092] The inclined plate 253 extends at an angle. Specifically, along the second direction, the connection between the inclined plate 253 and the first plate 251 is closer to the joint 241 than the connection between the inclined plate 253 and the second plate 252. The second direction differs from the first direction, that is, it describes the direction of inclination of the inclined plate 253. The first plate 251, the second plate 252, and the inclined plate 253 enclose a trapezoidal structure, giving the first reinforcing bracket 25a a stable structural state and good resistance to deformation.

[0093] The expansion force of the battery cell assembly 23 is transmitted from the beam 22 to the first plate 251. Since the connection between the inclined plate 253 and the first plate 251 is closer to the joint 241 than the connection between the inclined plate 253 and the second plate 252, the force will be transmitted through the inclined plate 253 to the cavity wall of the mounting cavity 211 in a direction away from the joint 241, so as to guide the force around the stress concentration area where the joint 241 is located. In this way, the deformation of the beam 22 can be reduced, and the risk of cracking of the beam 22 and the box 21 can be reduced.

[0094] Meanwhile, the cooperative structure of the first plate 251, the second plate 252 and the inclined plate 253 can enhance the structural strength of the first reinforcing bracket 25a and improve the reinforcement effect of the first reinforcing bracket 25a.

[0095] In some embodiments of this application, the area of ​​the second plate 252 overlapping with the cavity wall of the mounting cavity 211 is greater than the area of ​​the first plate 251 overlapping with the beam 22; and / or one end of the inclined plate 253 is connected to the side of the first plate 251 away from the connector 241, and the other end of the inclined plate 253 is connected to the side of the second plate 252 away from the connector 241.

[0096] The area where the second plate 252 overlaps with the cavity wall of the mounting cavity 211 is larger than the area where the first plate 251 overlaps with the beam 22. In other words, the connection area between the first plate 251 and the beam 22 is relatively small, while the connection area between the second plate 252 and the cavity wall of the mounting cavity 211 is relatively large. It can also be said that the cross-sectional area of ​​the second plate 252 is larger than the cross-sectional area of ​​the first plate 251. This makes reasonable use of the structure of the beam 22 and the box 21. While ensuring the effective connection between the first plate 251 and the beam 22 and the second plate 252 and the box 21, it can reduce the material input of the first reinforcing bracket 25a, which is conducive to reducing the production cost of the product and reducing the weight of the product.

[0097] The beam 22 itself is the main structure that bears the expansion force of the battery cell assembly 23. The beam 22 has a large rigidity. The connection area between the first plate 251 and the beam 22 is relatively small, which can concentrate the expansion force to the first reinforcing bracket 25a and improve the force transmission efficiency.

[0098] The connection area between the second plate 252 and the cavity wall of the mounting cavity 211 is relatively large. The large contact surface can distribute the force from the beam 22 to the box 21 more evenly, which can reduce the probability of deformation or even cracking of the box 21 due to excessive local pressure. It can play a role in distributing the load. The larger connection area can improve the bending and torsional resistance of the first reinforcing bracket 25a and improve the support stiffness.

[0099] The first plate 251, the second plate 252, the inclined plate 253, the beam 22 and the box 21 cooperate to form triangular support structures on both sides of the joint 241, so as to adjust the force transmission path and enhance the support effect of the first reinforcing bracket 25a.

[0100] In some embodiments of this application, such as Figure 3 , Figure 4 and Figure 7As shown, the battery device 2 further includes: a first fastener 261, through which the first plate 251 and the beam 22 are connected; and a second fastener 262, through which the second plate 252 and the cavity wall of the mounting cavity 211 are connected. The first fastener 261 passes through the first plate 251 and the beam 22. Along the direction from the second plate 252 to the first plate 251, the first fastener 261 has opposing first outer surfaces 2611 and second outer surfaces 2612. The first outer surface 2611 is located between the first plate 251 and the second plate 252, and the second outer surface 2612 is located... Within the beam 22; and / or the second fastener 262 passes through the cavity wall of the second plate 252 and the mounting cavity 211. Along the direction from the second plate 252 to the first plate 251, the second fastener 262 has opposing third outer surfaces 2621 and fourth outer surfaces 2622. The outer surface of the box 21 facing away from the second plate 252 is the fifth outer surface 213 of the box 21. The third outer surface 2621 is located between the fifth outer surface 213 and the second plate 252, and the fourth outer surface 2622 is located between the first plate 251 and the second plate 252. The second fastener 262 does not penetrate the box 21.

[0101] The battery device 2 also includes a first fastener 261 and a second fastener 262.

[0102] The first plate 251 and the beam 22 are connected by the first fastener 261, that is, the first fastener 261 is used to connect the first plate 251 and the beam 22.

[0103] For example, the first fastener 261 includes a screw, bolt, or rivet.

[0104] The second plate 252 and the cavity wall of the mounting cavity 211 are connected by the second fastener 262. That is, the second fastener 262 is used to connect the second plate 252 and the cavity wall of the mounting cavity 211.

[0105] For example, the second fastener 262 includes a screw, bolt, or rivet.

[0106] Along the direction from the second plate 252 to the first plate 251, the first fastener 261 has opposing first outer surfaces 2611 and second outer surfaces 2612, and the second fastener 262 has opposing third outer surfaces 2621 and fourth outer surfaces 2622. The outer surface of the housing 21 facing away from the second plate 252 is the fifth outer surface 213 of the housing 21.

[0107] When the first fastener 261 passes through the first plate 251 and the beam 22, with the first outer surface 2611 located between the first plate 251 and the second plate 252, and the second outer surface 2612 located inside the beam 22, the first fastener 261 will not penetrate the beam 22 while meeting the usage requirements of connecting the first plate 251 and the beam 22. This reduces the material input for sealing the beam 22, lowers the sealing difficulty, and simplifies the sealing structure of the battery device 2.

[0108] When the second fastener 262 passes through the cavity wall of the second plate 252 and the mounting cavity 211, the third outer surface 2621 is located between the fifth outer surface 213 and the second plate 252, and the fourth outer surface 2622 is located between the first plate 251 and the second plate 252. When the second fastener 262 does not penetrate the housing 21, while meeting the usage requirements of the second fastener 262 connecting the cavity wall of the second plate 252 and the mounting cavity 211, it can prevent the second fastener 262 from penetrating the housing 21. That is, the second fastener 262 will not be visible from the outside of the housing 21. The second fastener 262 is hidden inside the housing 21. In this way, the material input for sealing the outer surface of the housing 21 and the connection of the second fastener 262 is reduced, which helps to reduce the sealing difficulty and simplifies the sealing structure of the battery device 2.

[0109] For example, the number of first fasteners 261 is at least one.

[0110] For example, the number of second fasteners 262 is at least one.

[0111] In some embodiments of this application, such as Figure 3 , Figure 4 and Figure 7 As shown, the first reinforcing bracket 25a also includes at least one reinforcing rib 254, which is connected between the first plate 251, the second plate 252 and the inclined plate 253.

[0112] The first reinforcing bracket 25a includes a first plate 251, a second plate 252, an inclined plate 253, and at least one reinforcing rib 254, which connects the first plate 251, the second plate 252, and the inclined plate 253. The at least one reinforcing rib 254 enhances the rigidity of the inclined plate 253, reduces the probability of lateral bending, and distributes the pressure borne by the inclined plate 253 more evenly across the first plate 251 and the second plate 252, preventing stress concentration on the inclined plate 253.

[0113] In addition, by setting at least one reinforcing rib 254, the first plate 251, the second plate 252 and the inclined plate 253 can be effectively supported to form a three-dimensional structural frame, which can further enhance the bending resistance of the first reinforcing bracket 25a.

[0114] When there are multiple reinforcing ribs 254, the multiple reinforcing ribs 254 are arranged at intervals.

[0115] In some embodiments of this application, such as Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown, the multiple reinforcing supports 25 include a second reinforcing support 25b, and the beam 22 is located between the second reinforcing support 25b and the bottom plate 212 of the box body 21.

[0116] Among them, the types of multiple reinforcing brackets 25 are classified, such that the multiple reinforcing brackets 25 include a second reinforcing bracket 25b, which connects the beam 22 and the cavity wall of the mounting cavity 211.

[0117] The housing 21 includes a bottom plate 212. The beam 22 is located between the second reinforcing bracket 25b and the bottom plate 212 of the housing 21. That is, the second reinforcing bracket 25b is connected to the side of the beam 22 away from the bottom plate 212, and the second reinforcing bracket 25b is also connected to the cavity wall of the mounting cavity 211. Alternatively, along the height direction of the housing 21 (i.e., the second direction), the second reinforcing bracket 25b is located above the beam 22. The second reinforcing bracket 25b has the function of reinforcing the beam 22 and the housing 21, thereby increasing the assembly structural strength of the beam 22 and the housing 21.

[0118] In some embodiments of this application, the plurality of reinforcing supports 25 include a first reinforcing support 25a and a second reinforcing support 25b. A joint 241 is located on the periphery of the battery cell assembly 23, and is situated between the first reinforcing support 25a and the bottom plate 212 of the housing 21. A beam 22 is located between the second reinforcing support 25b and the bottom plate 212 of the housing 21. The first reinforcing support 25a and the second reinforcing support 25b cooperate to reinforce the beam 22 and the housing 21 from multiple locations, providing structural support to reduce the deformation of the beam 22 and lower the risk of cracking in both the beam 22 and the housing 21.

[0119] In some embodiments of this application, such as Figure 5 , Figure 6 and Figure 8As shown, the battery device 2 also includes: a reinforcing plate 27 located on the outer surface of the housing 21, with a first portion 271 of the reinforcing plate opposite to the second reinforcing bracket 25b; a third fastener 263 connecting the reinforcing plate 27, the housing 21, and the second reinforcing bracket 25b; and a first sealing portion 264 used to seal the connection between the third fastener 263 and the reinforcing plate 27.

[0120] The battery device 2 further includes a reinforcing plate 27, a third fastener 263, and a first sealing portion 264. The reinforcing plate 27 is located on the outer surface of the housing 21, with its first portion 271 positioned opposite to the second reinforcing bracket 25b. That is, the reinforcing plate 27 is located on the outer side of the housing 21, and the second reinforcing bracket 25b is located on the inner side of the housing 21, with the housing wall of the housing 21 sandwiched between the second reinforcing bracket 25b and the reinforcing plate 27. The third fastener 263 connects the reinforcing plate 27, the housing 21, and the second reinforcing bracket 25b. The preload applied by the third fastener 263 effectively clamps the housing wall of the housing 21 with the reinforcing plate 27 and the second reinforcing bracket 25b.

[0121] The expansion force of the beam 22 is transmitted to the box 21 through the second reinforcing bracket 25b, and then to the reinforcing plate 27 on the outside of the box 21 through the third fastener 263. This increases the friction of the connecting surface and reduces the probability of the second reinforcing bracket 25b loosening or falling off.

[0122] The second reinforcing bracket 25b, the reinforcing plate 27, and the third fastener 263 work together to effectively fix the second reinforcing bracket 25b while distributing the force evenly over a larger area. This reduces the stress at the connection between the box 21, the beam 22, and the joint 241, thereby reducing the risk of cracking. At the same time, it also enhances the overall vibration resistance and fatigue resistance, effectively protecting the box 21 and the beam 22.

[0123] The first sealing part 264 is used to seal the connection between the third fastener 263 and the reinforcing plate 27. The first sealing part 264 has the functions of dustproof and waterproof, so as to prevent conductive media and the like from entering the interior of the battery device 2 through the connection between the third fastener 263 and the reinforcing plate 27, thereby avoiding short circuits and leakage, and providing structural support for the safety and reliability of the battery device 2.

[0124] For example, the first sealing part 264 includes sealant or sealing ring, etc., which will not be listed here.

[0125] For example, the third fastener 263 includes a screw, bolt, or rivet.

[0126] In some other embodiments, the battery device 2 does not include the reinforcing plate 27, and the second reinforcing bracket 25b is directly connected to the housing 21 via a fifth fastener. The second reinforcing bracket 25b is directly connected to the beam 22 via a sixth fastener 268. Exemplarily, the fifth fastener includes a screw, bolt, or rivet. Exemplarily, the sixth fastener 268 includes a screw, bolt, or rivet.

[0127] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the second part 272 of the reinforcing plate is disposed opposite to the beam 22; the battery device 2 also includes: a fourth fastener 265, which connects the reinforcing plate 27, the housing 21 and the beam 22, and the side of the fourth fastener 265 away from the reinforcing plate 27 is located inside the beam 22; and a second sealing part 266, which is used to seal the connection between the fourth fastener 265 and the reinforcing plate 27.

[0128] The second part 272 of the reinforcing plate is positioned opposite to the beam 22. That is, the reinforcing plate 27 is located on the outside of the box 21, and the beam 22 is located on the inside of the box 21. The box wall of the box 21 is sandwiched between the beam 22 and the reinforcing plate 27. The fourth fastener 265 connects the reinforcing plate 27, the box 21, and the beam 22. The preload applied by the fourth fastener 265 effectively clamps the box wall of the box 21 with the reinforcing plate 27 and the beam 22.

[0129] The expansion force of beam 22 is transmitted to the reinforcing plate 27 on the outside of box 21 through the fourth fastener 265. The expansion force is shared by the second reinforcing bracket 25b and the reinforcing plate 27, which can enhance rigid constraint. At the same time, since the expansion force is transmitted to the reinforcing plate 27, the bending moment and shear force borne by box 21 are reduced, thus protecting box 21. Meanwhile, the second reinforcing bracket 25b and the reinforcing plate 27 work together to improve the local rigidity of beam 22 and reduce the deformation of beam 22.

[0130] The second sealing part 266 is used to seal the connection between the fourth fastener 265 and the reinforcing plate 27. The second sealing part 266 has the functions of dustproof and waterproof, so as to prevent conductive media and the like from entering the interior of the battery device 2 through the connection between the fourth fastener 265 and the reinforcing plate 27, thus avoiding short circuits and leakage, and providing structural support for the safety and reliability of the battery device 2.

[0131] The reinforcing plate 27 can be used not only with the second reinforcing bracket 25b, but also with the beam 22.

[0132] The fourth fastener 265 is located inside the beam 22 on the side opposite to the reinforcing plate 27. The fourth fastener 265 does not penetrate the beam 22. In this way, the material input for sealing the beam 22 can be reduced, the sealing difficulty can be reduced, and the sealing structure of the battery device 2 can be simplified.

[0133] For example, the second sealing part 266 includes sealant or sealing ring, etc., which will not be listed here.

[0134] For example, the fourth fastener 265 includes a screw, bolt, or rivet.

[0135] In some embodiments of this application, such as Figure 5 , Figure 6 and Figure 8 As shown, the second reinforcing bracket 25b includes: a third plate 255, which is connected to the beam 22; and a fourth plate 256, which connects the third plate 255 and the cavity wall of the mounting cavity 211. The third plate 255 is located between the fourth plate 256 and the beam 22.

[0136] The second reinforcing bracket 25b includes a third plate 255 and a fourth plate 256, which are connected. The third plate 255 is also connected to the beam 22, and the fourth plate 256 is also connected to the cavity wall of the mounting cavity 211. The third plate 255 is located between the fourth plate 256 and the beam 22. That is, the third plate 255 and the fourth plate 256 are L-shaped. When the beam 22 warps upward due to force, the third plate 255 and the fourth plate 256 cooperate to press the beam 22 downward, thereby increasing the local rigidity of the beam 22 and reducing the deformation of the beam 22.

[0137] For example, along the second direction, the third plate 255 is located between the fourth plate 256 and the beam 22.

[0138] In some embodiments of this application, there are multiple second reinforcing brackets 25b, which are arranged at intervals along a third direction, which is different from the first direction.

[0139] The second reinforcing bracket 25b is multiple in number and arranged at intervals along the third direction. The multiple second reinforcing brackets 25b share the load of the beam 22, so that the expansion force of the beam 22 is evenly distributed to the multiple second reinforcing brackets 25b, which can realize the uniformity of force, prevent the occurrence of local overload, and provide structural support to reduce the probability of cracking of the beam 22 and the box 21.

[0140] In some embodiments of this application, at least a portion of the reinforcing bracket 25 is an insulating reinforcing bracket.

[0141] At least a portion of the reinforcing bracket 25 is an insulating reinforcing bracket, that is, a portion of the reinforcing bracket 25 is an insulating reinforcing bracket, or all of the reinforcing bracket 25 is an insulating reinforcing bracket. The reinforcing bracket 25 not only reinforces the beam 22 and the box 21, but also has insulating properties, which can block the electrical conduction path and prevent short circuits and leakage. In this way, the material input of the additional insulation structure of the battery device 2 can be reduced, and the production cost of the battery device 2 can be reduced.

[0142] For example, the outer surface of the reinforcing bracket 25 is coated with an insulating layer to meet the requirement that at least a portion of the reinforcing bracket 25 is an insulating reinforcing bracket.

[0143] For example, at least a portion of the reinforcing bracket 25 is made of insulating material to meet the requirement that at least a portion of the reinforcing bracket 25 is an insulating reinforcing bracket.

[0144] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the battery device 2 also includes a mounting bracket 267, which is connected to the outer surface of the housing 21.

[0145] The battery device 2 also includes a mounting bracket 267, which is connected to the outer surface of the housing 21. The housing 21 is hung inside the electrical device via the mounting bracket 267, and the mounting bracket 267 can withstand vibrations and impacts from the outside.

[0146] In some embodiments of this application, the connector 241 is located between the battery cell assembly 23 and the hanger 267.

[0147] Among them, the positional relationship of the connector 241, the battery cell assembly 23 and the hanger 267 is refined. The connector 241 is located between the battery cell assembly 23 and the hanger 267. The hanger 267 has the function of isolating the connector 241 of the heat exchange structure 24 to protect the connector 241 and prevent the connector 241 from being impacted by external forces. It has the function of compact layout and the battery device 2 can be flatter.

[0148] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 4As shown, there are multiple connectors 241 and multiple first reinforcing brackets 25a. The multiple connectors 241 are divided into at least one connector group 243. Each connector group 243 is located between the bottom plate 212 and at least one first reinforcing bracket 25a. The connector group 243 includes multiple connectors 241. When there are multiple connector groups 243, a portion of the connector groups 243 are located on the first side 231 of the battery cell assembly, and another portion of the connector groups 243 are located on the second side 232 of the battery cell assembly.

[0149] The system comprises multiple joints 241 and multiple first reinforcing supports 25a. The multiple joints 241 are divided into at least one joint group 243, each joint group 243 comprising multiple joints 241, and each joint group 243 is located between the bottom plate 212 and at least one first reinforcing support 25a. The multiple first reinforcing supports 25a and at least one joint group 243 cooperate to enhance the supporting function of the multiple reinforcing supports 25a. Within the joint group 243, each joint 241 includes at least a heat exchange medium inlet joint and a heat exchange medium outlet joint.

[0150] When there are multiple connector groups 243, a portion of the connector groups 243 are located on the first side 231 of the battery cell assembly, and another portion of the connector groups 243 are located on the second side 232 of the battery cell assembly. The first side 231 and the second side 232 of the battery cell assembly are opposite sides of the battery cell assembly 23 in a third-order direction. The positioning of the multiple connector groups 243 allows for heat exchange between the battery cell assembly 23 and multiple sides of the battery cell assembly 23, which can uniformly reduce the temperature of the battery cell assembly 23, thus extending the service life of the battery cell assembly 23 and improving its operational safety.

[0151] Exemplarily, the battery device 2 includes a housing 21, a beam 22, a battery cell assembly 23, a heat exchange structure 24, and multiple reinforcing supports 25. The housing 21 has a mounting cavity 211, within which the beam 22, battery cell assembly 23, heat exchange structure 24, and multiple reinforcing supports 25 are all located. The heat exchange structure 24 includes a connector 241 that passes through the beam 22 and the housing 21 along a first direction. The connector 241 has an interface 242 that protrudes from the outer surface of the housing 21. The multiple reinforcing supports 25 include at least a first reinforcing support 25a and a second reinforcing support 25b. A first reinforcing support 25a is added at the connector 241. The first reinforcing support 25a is connected to the top end of the beam 22 and also to the cavity wall of the mounting cavity 211 of the housing 21. A second reinforcing bracket 25b is added to the top of the beam 22. The second reinforcing bracket 25b is L-shaped and connected to the beam 22. The second reinforcing bracket 25b is also connected to the cavity wall of the mounting cavity 211. A reinforcing plate 27 is added to the outside of the box 21. The reinforcing plate 27, the box 21 and the second reinforcing bracket 25b are connected by a third fastener 263 to further reinforce the box 21 and the beam 22.

[0152] For example, the first plate 251 and beam 22 of the first reinforcing bracket 25a are connected by a first fastener 261, the second plate 252 of the first reinforcing bracket 25a and the cavity wall of the mounting cavity 211 are connected by a second fastener 262, a third fastener 263 connects the reinforcing plate 27, the housing 21 and the second reinforcing bracket 25b, and a fourth fastener 265 connects the reinforcing plate 27, the housing 21 and the beam 22. At least one of the first fastener 261, the second fastener 262, the third fastener 263 and the fourth fastener 265 is a blind rivet. The blind rivet fixation is a mechanical connection, which is more stable and reliable than glue connection. At the same time, the riveting point avoids penetrating the housing 21 or the expansion beam (i.e., the beam 22), thereby reducing the workload of subsequent sealing treatment. Using blind rivets for fixation has the advantage of reducing the number of metal parts by half compared to bolts and nuts, resulting in weight reduction. It is also more reliable and stable than glue connection. When using blind rivets for connection, if part of the blind rivet protrudes from the outer surface of the housing 21, additional sealing protection is required to improve the overall sealing performance of the housing 21. For example, when using blind rivets to connect the housing 21 and the reinforcing bracket 25, the length of the blind rivet should not penetrate the side beam of the housing 21. After riveting, the housing 21 can still achieve a seal by relying on the outer skin of the side beam (i.e., the housing body of the housing 21), reducing the workload of subsequent sealing repairs.

[0153] For example, considering the need for lightweighting, the reinforcing bracket 25 includes a continuous fiber composite material bracket. Where insulation is required, the reinforcing bracket 25 includes a glass fiber bracket. Where insulation is not required, the reinforcing bracket 25 includes a carbon fiber bracket. The continuous fiber composite material bracket has the advantages of lower density and higher specific strength compared to metal brackets.

[0154] For example, the reinforcing bracket 25 includes polymer-based glass fiber brackets and aramid fiber brackets, etc., which will not be listed here. The reinforcing bracket 25 has good insulation properties and is suitable for scenarios where insulation is required. Although carbon fiber brackets have higher strength, they are conductive and need to be avoided at electrical connection locations.

[0155] For example, the thickness of the reinforcing bracket 25 is greater than or equal to 1 mm, such as 2 mm.

[0156] For example, the battery cell assembly 23 tends to expand cyclically during charging and discharging, and the cumulative deformation will be transmitted to the expansion beams (i.e., beams 22) at both ends of the housing 21. The housing 21 includes a main body and side beams, with the side beams located inside the main body and connected between the expansion beams and the main body. On the one hand, the rigidity of the expansion beams themselves can resist some of the deformation; on the other hand, the expansion force will be transmitted to the side beams inside the main body, providing deformation resistance for the entire housing 21 through the mounting (i.e., the mounting brackets 267). Since the inlet and outlet (i.e., the two connectors 241 of the connector group 243) break the connection between the expansion beams and the side beams, only the bottom composite material layer (i.e., the bottom plate 212 of the main body) can provide a certain amount of support, increasing the deformation of the expansion beams. By adding a triangular reinforcing bracket (i.e., the first reinforcing bracket 25a) near the top of the mounting cavity 211, the force transmission between the expansion beams and the frame mounting is increased, improving the ability of the housing 21 to resist the expansion deformation of the battery cell assembly 23 and reducing the deformation of the expansion beams. For example, the box body and the side beams are integrally formed.

[0157] For example, when the battery cell assembly 23 expands, the deformation of the expansion beam is greater the closer it is to the center of the expansion beam. Several reinforcing plates 27 need to be added to the outside of the housing 21 for reinforcement. The L-shaped bracket (i.e., the second reinforcing bracket 25b) cooperates with the external reinforcing plate 27 to improve the local rigidity of the expansion beam and reduce the deformation of the expansion beam.

[0158] For example, in the battery device 2, the battery cell assembly 23 includes multiple battery cells, and the heat exchange structure 24 includes multiple water-cooled plates 244 and multiple connectors 241. Except for the battery cells near the expansion beam, the remaining battery cells have water-cooled plates 244 arranged on both end faces of the heat exchange structure 24 in the first direction. Connectors 241 need to be installed between two water-cooled plates 244 to achieve hot and cold water circulation. The length of the connector 241 should be basically the same as the width of the battery cell, especially for thin-walled battery cells (e.g., the width of the battery cell is less than 30mm). If the length of the connector 241 is too short, it will not meet the functional requirements. Therefore, it is not possible to arrange connectors 241 between two adjacent water-cooled plates 244. It is necessary to install one connector 241 every other water-cooled plate 244. Under this arrangement, connector groups 243 need to be arranged on both sides of the cell area (i.e., the battery cell assembly 23) to connect with the inlet and outlet flanges on both sides of the housing 21 to achieve coolant circulation.

[0159] Both ends of the expansion beam require reserved installation space for the connector 241, and notches are needed at both ends of the expansion beam for the connector 241 to pass through. This disrupts the force transmission structure between the mounting (i.e., the mounting bracket 267) and the expansion beam (i.e., the beam body 22), relying solely on the bottom composite material layer (i.e., the bottom plate 212) for force transmission. When the battery cell assembly 23 expands, the mounting cannot provide sufficient support to the expansion beam to resist the deformation of the battery cell assembly 23. By adding a first reinforcing bracket 25a, the first reinforcing bracket 25a can both avoid the connector 241 and mechanically connect the expansion beam, the side beam, and the mounting bracket 267 into a single structure, increasing the support provided by the mounting to the expansion beam. The first reinforcing bracket 25a, the expansion beam, and the side beam are connected by two or more rivets. To enhance the interface force transmission effect, an adhesive layer can be added to the connection interface between the first reinforcing bracket 25a, the expansion beam, and the side beam to connect them. The first reinforcing bracket 25a also includes at least one reinforcing rib 254, which is connected between the first plate 251, the second plate 252 and the inclined plate 253 to improve the rigidity of the first reinforcing bracket 25a.

[0160] For example, multiple second reinforcing brackets 25b are provided on the top surface of the expansion beam (i.e., beam 22). The second reinforcing brackets 25b are L-shaped. One side of the second reinforcing bracket 25b (i.e., the third plate 255 of the second reinforcing bracket 25b) is connected to the expansion beam by rivets, and the other side of the second reinforcing bracket 25b (i.e., the fourth plate 256 of the second reinforcing bracket 25b) is connected to the skin of the box 21 (i.e., the box body of the box 21) by rivets. The number of rivets on one side of the second reinforcing bracket 25b is greater than or equal to two to improve the reliability of assembly. To further improve the structural rigidity, a reinforcing plate 27 is added to the outer surface of the box 21. On the one hand, the reinforcing plate 27 is used to connect the expansion beam; on the other hand, the reinforcing plate 27 is fixed to the outer surface of the skin of the box 21, thereby increasing the bending rigidity of the middle part of the expansion beam. Considering the sealing effect of the housing 21, if there are openings on the outer surface of the housing 21, sealant should be applied to the riveting position after the riveting is connected to the openings to provide protection. The L-shaped bracket (i.e., the second reinforcing bracket 25b) is also made of continuous fiber composite material, which has the advantages of high strength and low density. Considering the overall lightweight design, reinforcing brackets 25 are added to the middle area and both ends of the expansion beam where the deformation is large.

[0161] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0162] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: The housing has an installation cavity inside; A beam is disposed in the mounting cavity, and the beam is connected to the cavity wall of the mounting cavity; A battery cell assembly is disposed in the mounting cavity; A heat exchange structure is provided in the mounting cavity. The heat exchange structure is used to exchange heat with the battery cell assembly. The heat exchange structure includes a joint. Along a first direction, the joint passes through the beam and the housing. The joint has an interface that exposes the outer surface of the housing. Multiple reinforcing brackets are disposed in the mounting cavity, and the reinforcing brackets connect the beam body and the cavity wall of the mounting cavity.

2. The battery device according to claim 1, characterized in that, The plurality of reinforcing brackets include a first reinforcing bracket, the connector being located on the periphery of the battery cell assembly, and the connector being located between the first reinforcing bracket and the bottom plate of the housing.

3. The battery device according to claim 2, characterized in that, The first reinforcing bracket includes: The first plate is connected to the beam. The second plate is connected to the cavity wall of the mounting cavity; An inclined plate, the inclined plate being connected between the first plate and the second plate; Along the second direction, the connection between the inclined plate and the first plate is closer to the joint than the connection between the inclined plate and the second plate. The second direction is different from the first direction.

4. The battery device according to claim 3, characterized in that, The area where the second plate overlaps with the cavity wall of the mounting cavity is greater than the area where the first plate overlaps with the beam; and / or One end of the inclined plate is connected to the side of the first plate away from the joint, and the other end of the inclined plate is connected to the side of the second plate away from the joint.

5. The battery device according to claim 3, characterized in that, The battery device also includes: The first fastener connects the first plate and the beam. The second fastener connects the second plate and the cavity wall of the mounting cavity. The first fastener passes through the first plate and the beam. Along the direction from the second plate to the first plate, the first fastener has opposing first and second outer surfaces. The first outer surface is located between the first plate and the second plate, and the second outer surface is located within the beam; and / or The second fastener passes through the cavity wall of the second plate and the mounting cavity. Along the direction from the second plate to the first plate, the second fastener has a third outer surface and a fourth outer surface. The outer surface of the housing opposite to the second plate is the fifth outer surface of the housing. The third outer surface is located between the fifth outer surface and the second plate, and the fourth outer surface is located between the first plate and the second plate. The second fastener does not penetrate the housing.

6. The battery device according to claim 3, characterized in that, The first reinforcing bracket further includes at least one reinforcing rib, which is connected between the first plate, the second plate, and the inclined plate.

7. The battery device according to any one of claims 1 to 6, characterized in that, The plurality of reinforcing supports include a second reinforcing support, and the beam is located between the second reinforcing support and the bottom plate of the box body.

8. The battery device according to claim 7, characterized in that, The battery device also includes: A reinforcing plate is located on the outer surface of the housing, and a first part of the reinforcing plate is disposed opposite to the second reinforcing bracket. The third fastener connects the reinforcing plate, the housing, and the second reinforcing bracket; The first sealing part is used to seal the connection between the third fastener and the reinforcing plate.

9. The battery device according to claim 8, characterized in that, The second part of the reinforcing plate is disposed opposite to the beam. The battery device also includes: The fourth fastener connects the reinforcing plate, the box body, and the beam body, with the side of the fourth fastener facing away from the reinforcing plate located inside the beam body; The second sealing part is used to seal the connection between the fourth fastener and the reinforcing plate.

10. The battery device according to claim 7, characterized in that, The second reinforcing bracket includes: The third plate is connected to the beam. A fourth plate, which connects the third plate and the cavity wall of the mounting cavity, wherein the third plate is located between the fourth plate and the beam.

11. The battery device according to claim 7, characterized in that, The number of the second reinforcing brackets is multiple, and the multiple second reinforcing brackets are arranged at intervals along a third direction, which is different from the first direction.

12. The battery device according to any one of claims 1 to 6, characterized in that, At least a portion of the reinforcing bracket is an insulating reinforcing bracket.

13. The battery device according to any one of claims 2 to 6, characterized in that, The battery device also includes: A mounting bracket is attached to the outer surface of the housing.

14. The battery device according to claim 13, characterized in that, The connector is located between the battery cell assembly and the mounting bracket.

15. The battery device according to any one of claims 2 to 6, characterized in that, The number of the joints and the first reinforcing brackets are both multiple, and the multiple joints are divided into at least one joint group. Each joint group is located between the bottom plate of the box and at least one first reinforcing bracket, and the joint group includes multiple joints. When there are multiple connector groups, a portion of the connector groups are located on the first side of the battery cell assembly, and another portion of the connector groups are located on the second side of the battery cell assembly.

16. An electrical appliance, characterized in that, include: The battery device as claimed in any one of claims 1 to 15.

Images