Battery device and electric device

Abstract

The application discloses a battery device and an electric device, the battery device comprises a plurality of battery packs and a top cover, the plurality of battery packs are arranged in sequence along the up-down direction, each battery pack comprises a box body and a battery module arranged in the box body, the battery module comprises a plurality of battery monomers, the box bodies of two adjacent battery packs are connected, the box body comprises a bottom plate and a box outer frame, the bottom plate is arranged at the bottom of the box outer frame and connected with the box outer frame, the top of the box outer frame is formed with an open port, the bottom plate of the upper battery pack of the two adjacent battery packs directly covers the open port of the lower battery pack, and the top cover is arranged on the open port of the uppermost battery pack. According to the battery device, the battery device comprises a plurality of battery packs arranged in sequence along the up-down direction, and the bottom plate of the upper battery pack of the two adjacent battery packs directly covers the open port of the lower battery pack, so that the weight of the whole battery device can be effectively reduced and the manufacturing cost can be reduced.

Description

Technical Field

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

[0002] Currently, vehicles commonly use battery packs as their power source, and the energy demand from batteries is constantly increasing. For example, commercial vehicles, due to their operational requirements, typically need to be equipped with multiple battery packs to ensure the power supply for the entire vehicle. However, related technologies often fix multiple battery packs within a single metal frame, which leads to an increase in redundant structural weight (approximately 15%-20%) and manufacturing costs (material and processing costs account for over 25%). Alternatively, multiple battery packs can be installed independently in various parts of the vehicle body, which carries the risk of accumulated assembly tolerances (gap control error > ±3mm) and requires a large amount of space for assembly. Therefore, how to achieve lightweight design of battery devices and reduce costs while meeting the high energy usage requirements of vehicles is a pressing technical challenge that needs to be addressed. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery device having multiple battery packs arranged sequentially in a vertical direction, resulting in a large energy storage capacity. Furthermore, by having the bottom plate of the upper battery pack directly cover the open opening of the lower battery pack, only the open opening of the uppermost battery pack needs to be covered to seal all the open openings of the battery packs, eliminating the need for multiple battery pack covers. This effectively reduces the overall weight of the battery device and lowers manufacturing costs.

[0004] The present invention also proposes an electrical device including the above-described battery device.

[0005] According to a first aspect of the present invention, a battery device includes: a plurality of battery packs arranged sequentially in a vertical direction, each battery pack including a housing and a battery module disposed within the housing, the battery module including a plurality of battery cells, the housings of two adjacent battery packs being connected, the housing including a bottom plate and a housing outer frame, the bottom plate being disposed at the bottom of the housing outer frame and connected to the housing outer frame, the top of the housing outer frame having an opening, and the bottom plate of the upper battery pack of two adjacent battery packs covering the opening of the lower battery pack; and a top cover covering the opening of the uppermost battery pack.

[0006] According to the battery device of the present invention, by arranging multiple battery packs sequentially in a vertical direction, with a top cover covering the opening of the uppermost battery pack, connecting the housings of two adjacent battery packs, and having the bottom plate cover of the upper battery pack located at the opening of the lower battery pack, the bottom plate of the upper battery pack serves as the cover for the lower battery pack. This achieves a sealing and protection effect for the lower battery pack, eliminating the need for the cover plate of the lower battery pack in adjacent battery packs. This facilitates the overall lightweighting of the battery device and reduces costs.

[0007] In addition, by directly connecting the housings of two adjacent battery packs, the integrated assembly of multiple battery packs is achieved, making the overall structure of the battery device more compact, reducing the space occupied by the battery device, and eliminating the need for an additional integrated fixing frame to connect multiple battery packs, which is beneficial to the lightweighting of the battery device.

[0008] According to some embodiments of the present invention, the base plate is a heat-conducting plate, and a heat exchange channel is formed in the base plate. The heat exchange channel is used for the flow of heat exchange medium or for accommodating electric heating elements. The base plate is thermally connected to the battery module in the same battery pack.

[0009] According to some embodiments of the present invention, the base plate is thermally connected to the battery module in the adjacent battery pack below.

[0010] According to some embodiments of the present invention, each of the heat exchange channels within the base plate includes a first heat exchange channel for the flow of a heat exchange medium.

[0011] According to some embodiments of the present invention, the heat exchange channel located in the bottom plate at the lowest side includes a second heat exchange channel, and the electric heating element is provided in the second heat exchange channel.

[0012] According to some embodiments of the present invention, the second heat exchange channel extends along the first direction, and the second heat exchange channel is a plurality of channels arranged at intervals along the second direction. The distance between two adjacent second heat exchange channels along the second direction is greater than 100 mm, and the first direction, the second direction and the up and down direction intersect each other.

[0013] According to some embodiments of the present invention, the bottom plate located at the lowest side has an installation opening formed on at least one side along a first direction, the installation opening being opposite to and communicating with the second heat exchange channel, and a sealing member is provided at the installation opening to seal the installation opening; And / or, both the first heat exchange channel and the second heat exchange channel extend along the first direction, and the first heat exchange channel and the second heat exchange channel are arranged at intervals along the second direction, with the first direction, the second direction and the up and down direction intersecting each other.

[0014] According to some embodiments of the present invention, the thickness of the base plate in the vertical direction is greater than 7 mm; and / or, the height of the heat exchange channel in the vertical direction is greater than 4 mm; and / or, the width of the heat exchange channel is greater than 20 mm.

[0015] According to some embodiments of the present invention, the outer frame and the bottom plate of the same box are independently molded parts.

[0016] According to some embodiments of the present invention, the bottom plate of the same box body is welded to the outer frame of the box body.

[0017] According to some embodiments of the present invention, the outer frame of the box is an integrally formed part; and / or, the outer frame of the box is an extruded profile; and / or, the outer frame of the box is an aluminum part or an aluminum alloy part.

[0018] According to some embodiments of the present invention, the top cover is a heat-conducting plate, and a heat exchange channel for the flow of heat exchange medium is formed inside the top cover. The top cover is thermally connected to the battery cell in the same battery pack.

[0019] According to some embodiments of the present invention, an exhaust groove is formed on the lower side of the top cover, and a pressure relief valve on the battery cell located below the top cover faces the exhaust groove.

[0020] According to some embodiments of the present invention, the exhaust groove extends along a first direction, and the width of the exhaust groove along a second direction is greater than 40 mm; and / or, the pressure relief valve facing the exhaust groove and the top cover are spaced more than 5 mm apart in the vertical direction; and / or, the exhaust groove is a plurality of grooves spaced apart along the second direction.

[0021] According to some embodiments of the present invention, two adjacent battery packs are detachably connected.

[0022] According to some embodiments of the present invention, the housings of two adjacent battery packs are connected by fasteners.

[0023] According to some embodiments of the present invention, the outer frame of the housing includes an outer frame body, an outer reinforcing beam, and a connecting flange. The outer reinforcing beam is connected to the bottom of the outer frame body and located on the outside of the outer frame body. A cavity is formed inside the outer reinforcing beam. The connecting flange is connected to the top of the outer frame body and located on the outside of the outer frame body. The outer reinforcing beams of two adjacent battery packs are connected to the connecting flange.

[0024] According to some embodiments of the present invention, the outer reinforcing beam is located on opposite sides of the outer frame along the second direction, the connecting flange is located on opposite sides of the outer frame along the second direction, and both the outer reinforcing beam and the connecting flange extend along the first direction; And / or, the thickness of the outer reinforcing beam along the vertical direction is greater than 20mm, and the width of the outer reinforcing beam is greater than 25mm.

[0025] According to some embodiments of the present invention, the connecting flange is provided with a plurality of first connecting holes, which are arranged at intervals along the circumference of the housing, and the outer reinforcing beam is provided with a plurality of second connecting holes, which are arranged at intervals along the circumference of the housing, and the plurality of first connecting holes and the plurality of second connecting holes are respectively connected by fasteners.

[0026] According to some embodiments of the present invention, the spacing between two adjacent second connecting holes is greater than 60 mm; and / or, the diameter of the second connecting hole is greater than 10 mm.

[0027] According to some embodiments of the present invention, the housing is provided with a reinforcing beam, the reinforcing beam is disposed on the bottom plate and extends along a second direction, the two ends of the reinforcing beam in the length direction are connected to the outer frame of the housing, and the reinforcing beam is used to fix the battery module; and / or, the battery pack consists of two units arranged vertically.

[0028] An electrical device according to a second aspect of the present invention includes: a battery device according to the first aspect of the present invention described above.

[0029] According to the embodiments of the present invention, the power device is equipped with the above-mentioned battery device. The battery device has a large energy storage capacity, a light weight, and a low manufacturing cost, which can fully meet the high power consumption requirements of the power device and help to achieve the lightweighting of the power device.

[0030] According to some embodiments of the present invention, the electrical device is a vehicle.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a battery device according to some embodiments of the present invention; Figure 2 yes Figure 1 A schematic diagram of the battery device from another angle; Figure 3 yes Figure 1 Exploded view of the battery device in the image; Figure 4 yes Figure 3 An exploded view of the battery device from another angle; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6 yes Figure 1 A cross-sectional view of the battery device in the middle; Figure 7 yes Figure 1 Exploded view of a portion of the battery device in the image; Figure 8 yes Figure 1 A cross-sectional view of a portion of the battery device structure; Figure 9 yes Figure 8 Enlarged view of point B in the middle; Figure 10 yes Figure 7 A schematic diagram of the top cover of the battery device; Figure 11 yes Figure 10 A schematic diagram of the top cover from another angle; Figure 12 yes Figure 7 A schematic diagram of part of the outer frame structure of the battery device in the diagram; Figure 13 yes Figure 7 Exploded view of some structures and electric heating elements in the battery device; Figure 14 This is a simplified diagram of an electrical device according to some embodiments of the present invention.

[0033] Figure label: 1000. Electrical appliances; 200. Vehicle body; 100. Battery device; 1. Battery pack; 11. Battery module; 111. Battery cell; 12a. Housing; 12. Base plate; 121. First heat exchange channel; 122. Second heat exchange channel; 123. Electric heating element; 125. Sealing element; 126. Insulation layer; 13. Outer frame of the housing; 131. Opening; 132. Outer frame; 1321. Reinforcing bulge; 133. External reinforcing beam; 1331. Second connecting hole; 1332. Cavity; 134. Connecting flange; 1341. First connecting hole; 135. Connecting insert plate; 14. Reinforcing crossbeam; 141. Fastening bolt; 2. Top cover; 21. Exhaust groove; 22. Heat exchange channel. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following is for reference. Figures 1-13 A battery device 100 according to an embodiment of the present invention is described.

[0036] Reference Figures 1-4 According to a first aspect of the present invention, a battery device 100 includes a plurality of battery packs 1 and a top cover 2. The plurality of battery packs 1 are arranged sequentially in a vertical direction. Each battery pack 1 includes a housing 12a and a battery module 11 disposed within the housing 12a. The battery module 11 includes a plurality of battery cells 111. The housings 12a of two adjacent battery packs 1 are connected. The housing 12a includes a bottom plate 12 and a housing outer frame 13. The bottom plate 12 is disposed at the bottom of the housing outer frame 13 and is connected to the housing outer frame 13. An opening 131 is formed at the top of the housing outer frame 13. The bottom plate 12 of the upper battery pack 1 of two adjacent battery packs 1 covers the opening 131 of the lower battery pack 1. The top cover 2 is disposed on the opening 131 of the uppermost battery pack 1.

[0037] By including multiple battery packs 1 in the battery device 100, the overall energy storage capacity of the battery device 100 can be increased, making it compatible with high-power electrical devices 1000. For example, when the battery device 100 is used as a power source for commercial vehicles, it can adequately meet the high power consumption requirements of commercial vehicles.

[0038] By arranging multiple battery packs 1 sequentially in the vertical direction, each battery pack 1 includes a housing 12a and a battery module 11 disposed within the housing 12a. The housing 12a includes a bottom plate 12 and an outer frame 13. The bottom plate 12 is located at the bottom of the outer frame 13 and is connected to the outer frame 13. The bottom plate 12 can provide stable support for the battery module 11. The outer frame 13 can protect the battery module 11 disposed within the housing 12a, reducing the possibility of friction and wear of the battery module 11 caused by external impacts, which is beneficial to extending the service life of the battery module 11. The opening 131 formed at the top of the outer frame 13 facilitates the placement of the battery module 11 into the housing 12a.

[0039] A top cover 2 is provided at the opening 131 of the uppermost battery pack 1. The top cover 2 can cover the opening 131 of the uppermost battery pack 1, so as to seal the top of the outer frame 13 of the uppermost battery pack 1 and prevent external dust, water and other impurities from entering the uppermost battery pack 1 through the upper opening 131.

[0040] Furthermore, the connection between the housings 12a of two adjacent battery packs 1 is achieved by having the bottom plate 12 of the upper battery pack 1 cover the opening 131 of the lower battery pack 1. By using the bottom plate 12 of the upper battery pack 1 to cover the opening 131 of the lower battery pack 1, a sealing effect can be achieved on the top of the outer frame 13 of the housing of the lower battery pack 1. This creates a relatively independent sealed space within each battery pack 1, effectively preventing external dust, water, and other impurities from entering the housing 12a. This effectively improves the service life of the battery device 100 and eliminates the need for cover plates to seal the openings 131 of multiple lower battery pack housings 12a, reducing the number of cover plate components, simplifying the overall structure of the battery device 100, and effectively reducing the overall weight of the battery device 100, which is beneficial for reducing manufacturing costs.

[0041] In addition, by directly connecting the housings 12a of two adjacent battery packs 1, the integrated assembly of multiple battery packs 1 is realized, making the overall structure of the battery device 100 more compact, reducing the space occupied by the battery device 100, and eliminating the need for an additional integrated fixing frame to connect multiple battery packs 1, which is beneficial to the lightweighting of the battery device 100.

[0042] In the description of this invention, "a plurality of" means two or more.

[0043] According to an embodiment of the present invention, the battery device 100 has a large energy storage capacity by having multiple battery packs 1 arranged sequentially in a vertical direction. Furthermore, by having the bottom plate 12 of the upper battery pack 1 directly cover the opening 131 of the lower battery pack 1, only the top cover 2 of the uppermost battery pack 1 is needed to seal all the openings 131 of the battery packs 100, eliminating the need for multiple cover plates and effectively reducing the overall weight and manufacturing cost of the battery device 100. In addition, adjacent battery packs 1 are directly fixedly connected by a housing 12a, achieving integrated assembly of multiple battery packs 1, resulting in a more compact overall structure of the battery device 100. This eliminates the need for an additional integrated fixing frame, further optimizing the lightweight effect of the battery device 100.

[0044] In addition, by directly connecting the housings 12a of two adjacent battery packs 1, the integrated assembly of multiple battery packs 1 is realized, making the overall structure of the battery device 100 more compact, reducing the space occupied by the battery device 100, and eliminating the need for an additional integrated fixing frame to connect multiple battery packs 1, which is beneficial to the lightweighting of the battery device 100.

[0045] Reference Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the base plate 12 is a heat-conducting plate, and a heat exchange channel is formed in the base plate 12. The heat exchange channel is used for the flow of heat exchange medium or for accommodating the electric heating element 123. The base plate 12 is thermally connected to the battery module 11 in the same battery pack 1.

[0046] By making the base plate 12 a heat-conducting plate and thermally connecting the base plate 12 with the battery module 11 in the same battery pack 1, the base plate 12 can conduct heat transfer to the battery module 11 in the same battery pack 1. This allows the heat generated by the battery module 11 in the same battery pack 1 to be transferred to the heat exchange channel in the base plate 12. The heat exchange medium in the heat exchange channel can exchange heat with the battery module 11. For example, when the temperature of the battery module 11 is too high, the heat generated by the battery module 11 can be quickly transferred to the heat exchange channel through the base plate 12 so that the heat exchange medium can absorb the heat of the battery module 11 and achieve the heat dissipation effect of the battery module 11.

[0047] Alternatively, the heat exchange channel may contain an electric heating element 123, such as a PTC sheet. By generating heat through the electric heating element 123, this heat can heat the battery module 11. For example, when the temperature of the battery module 11 is too low, the heat released by the electric heating element 123 is quickly transferred to the battery module 11 through the base plate 12 to heat the battery module 11.

[0048] By providing a heat exchange channel within the base plate 12, the space within the base plate 12 can be fully utilized. While supporting the battery module 11 within the same battery pack 1, it also serves to exchange heat with the battery module 11. There is no need to set up a separate heat exchange plate, which reduces the number of parts and helps to reduce the overall weight of the battery device 100 and reduce costs.

[0049] For example, the base plate 12 and the battery module 11 in the same battery pack 1 can be thermally connected through a thermally conductive structural adhesive layer. Since the thermally conductive structural adhesive layer has a strong thermal conductivity, by providing a thermally conductive structural adhesive layer between the base plate 12 and the battery module 11 in the same battery pack 1, the heat generated by the battery module 11 can be transferred relatively quickly to the heat exchange medium in the base plate 12 through the thermally conductive structural adhesive layer, which is beneficial to improving the heat exchange efficiency of the battery cell 111. Alternatively, the heat generated by the electric heating element 123 in the base plate 12 can be transferred relatively quickly to the battery module 11 in the same battery pack 1, so as to quickly heat the battery module 11 in the same battery pack 1.

[0050] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9According to some embodiments of the present invention, the base plate 12 is thermally connected to the battery module 11 in the adjacent battery pack 1 below.

[0051] By making the base plate 12 thermally connected to the battery module 11 in the adjacent battery pack 1 below, the base plate 12 can conduct heat transfer to the battery module 11 in the adjacent battery pack 1 below. This allows the heat generated by the battery module 11 in the adjacent battery pack 1 below to be transferred to the heat exchange channel in the base plate 12. The heat exchange medium in the heat exchange channel can exchange heat with the battery module 11 in the adjacent battery pack 1 below. For example, when the temperature of the battery module 11 in the adjacent battery pack 1 below is too high, the heat generated by the battery module 11 can be quickly transferred to the heat exchange channel through the base plate 12 so that the heat exchange medium can absorb the heat of the battery module 11 and achieve the heat dissipation effect of the battery module 11.

[0052] Alternatively, the heat exchange channel may contain an electric heating element 123. By generating heat through the electric heating element 123, this heat can heat the battery module 11 in the adjacent battery pack 1 below. For example, when the temperature of the battery module 11 in the adjacent battery pack 1 below is too low, the heat released by the electric heating element 123 is quickly transferred to the battery module 11 in the adjacent battery pack 1 below through the base plate 12 to heat the battery module 11 in the adjacent battery pack 1 below.

[0053] By making the base plate 12 thermally connected to the battery module 11 in the same battery pack 1 and to the battery module 11 in the adjacent battery pack 1 below, the base plate 12 can simultaneously exchange heat with the battery module 11 in the same battery pack 1 and the battery module 11 in the adjacent battery pack 1 below, effectively improving the heat dissipation efficiency of the battery module 11.

[0054] For example, in two adjacent battery packs 1, the bottom plate 12 of the upper battery pack 1 is thermally connected to the battery module 11 in the lower battery pack 1, and the bottom plate 12 of the lower battery pack 1 is also thermally connected to the battery module 11 in the lower battery pack 1. At this time, the bottom and top sides of the battery module 11 in the lower battery pack 1 are both equipped with bottom plates 12 with heat exchange channels. The heat exchange channels in the bottom plates 12 on the top and bottom sides of the battery module 11 in the lower battery pack 1 can simultaneously play a heat exchange role, so that the battery module 11 in the lower battery pack 1 has a double-layer heat exchange channel, which effectively improves the heat dissipation efficiency of the battery module 11 in the lower battery pack 1.

[0055] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9According to some embodiments of the present invention, each heat exchange channel in the base plate 12 includes a first heat exchange channel 121 for the flow of heat exchange medium. By providing a first heat exchange channel 121 for the flow of heat exchange medium in each base plate 12, the flowing heat exchange medium can perform heat exchange on the battery modules 11 in the same battery pack 1.

[0056] For example, the heat exchange medium can be a liquid such as water or ethylene glycol. The temperature of the heat exchange medium can be adjusted. When the temperature of the battery module 11 is too high, the heat exchange medium can absorb the heat generated by the battery module 11 and carry away this heat through flow, so as to achieve the heat dissipation effect of the battery module 11 in the same battery pack 1. When the temperature of the battery module 11 is too low, the heat exchange medium can keep the battery module 11 warm and improve the service life of the battery module 11.

[0057] Reference Figure 4 , Figure 8 , Figure 9 and Figure 13 According to some embodiments of the present invention, the heat exchange channel in the bottom plate 12 located at the lowest side includes a second heat exchange channel 122, and an electric heating element 123 is provided in the second heat exchange channel 122. By making the heat exchange channel in the bottom plate 12 located at the lowest side include the second heat exchange channel 122 and the second heat exchange channel 122 is provided with an electric heating element 123, the heat generated by the electric heating element 123 can heat the battery module 11 in the same battery pack 1.

[0058] For example, when the temperature of the battery module 11 is low or the battery device 100 is in a low-temperature environment, the electric heating element 123 can be activated to generate heat, which is then transferred through the base plate 12 to the battery module 11 located in the bottommost battery pack 1, thereby heating the battery module 11 located in the bottommost battery pack 1.

[0059] In addition, since there are no stacked battery packs 1 below the bottommost battery pack 1, when the electric heating element 123 heats the battery module 11 in the battery pack 1, the heat generated by the electric heating element 123 will not be transferred upward and downward to the battery module 11 of the two adjacent battery packs 1 at the same time. The heat generated by the electric heating element 123 is only transferred upward to the battery module 11 of the same battery pack 1. This can avoid the possibility of thermal runaway due to excessive temperature between two adjacent battery packs 1, which is beneficial to improving the safety and reliability of the battery device 100.

[0060] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9According to some embodiments of the present invention, the second heat exchange channel 122 extends along a first direction (for example, refer to the e1 direction in the figure), and the second heat exchange channel 122 is a plurality of channels arranged at intervals along a second direction (for example, refer to the e2 direction in the figure). The distance between two adjacent second heat exchange channels 122 along the second direction is greater than 100 mm, and the first direction, the second direction and the up and down direction intersect each other.

[0061] For example, the spacing between two adjacent second heat exchange channels 122 along the second direction is 105mm, 110mm, 110mm, 110mm, 110mm, etc.

[0062] By arranging multiple second heat exchange channels 122 at intervals along the second direction, and ensuring that the distance between two adjacent second heat exchange channels 122 along the second direction is greater than 100 mm, the multiple second heat exchange channels 122 can be distributed more evenly in the second direction. This allows the electric heating elements 123 located within the second heat exchange channels 122 to be distributed more evenly in the second direction. Consequently, the heat from the electric heating elements 123 can be transferred more evenly to the battery module 11 located in the bottommost battery pack 1, effectively improving the uniformity of heating and reducing or avoiding the possibility of thermal runaway due to localized overheating of the battery module 11 in the battery pack 1.

[0063] In addition, since each base plate 12 is also provided with a first heat exchange channel 121 for the flow of heat exchange medium, for example, the first heat exchange channel 121 and the second heat exchange channel 122 are arranged alternately along the second direction. By making the distance between two adjacent second heat exchange channels 122 along the second direction greater than 100mm, a relatively sufficient space can be reserved for the first heat exchange channel 121, so that it has a large enough flow cross section, so that the heat exchange medium can flow more smoothly in the first heat exchange channel 121, thereby playing an effective role in heat dissipation of the battery module 11 in the battery pack 1.

[0064] Reference Figure 6 , Figure 8 , Figure 9 and Figure 13 According to some embodiments of the present invention, the bottom plate 12 located at the lowest side has an installation opening formed on at least one side along the first direction. The installation opening is opposite to and communicates with the second heat exchange channel 122. A sealing member 125 is provided at the installation opening to seal the installation opening.

[0065] By forming an installation opening on at least one side of the bottom plate 12 along the first direction, the installation opening is opposite to and communicates with the second heat exchange channel 122. The installation opening makes it easier to assemble the electric heating element 123 on the bottom plate 12. Furthermore, by covering the installation opening with a sealing element 125, the sealing element 125 can provide a certain sealing effect for the installation opening, preventing external dust and other impurities from entering the second heat exchange channel 122 through the installation opening. The electric heating element 123 can also be disassembled and assembled on the bottom plate 12 by removing and installing the sealing element 125.

[0066] For example, the process of assembling the electric heating element 123 onto the base plate 12 can be as follows: first, the sealing element 125 is removed from the mounting port to expose the mounting port, so that the electric heating element 123 can be installed into the second heat exchange channel 122 through the mounting port. After the electric heating element 123 is assembled onto the base plate 12, the sealing element 125 can be assembled onto the mounting port to complete the assembly process of the electric heating element 123 onto the base plate 12.

[0067] For example, the process of removing the electric heating element 123 from the base plate 12 can be as follows: first, the sealing element 125 is removed from the mounting port to expose the mounting port, making it easier for the electric heating element 123 to be taken out through the mounting port. After the electric heating element 123 is completely removed from the base plate 12, the sealing element 125 can be assembled to the mounting port to complete the process of removing the electric heating element 123 from the base plate 12.

[0068] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the first heat exchange channel 121 and the second heat exchange channel 122 both extend along the first direction, the first heat exchange channel 121 and the second heat exchange channel 122 are arranged at intervals along the second direction, and the first direction, the second direction and the up and down direction intersect each other.

[0069] By extending the first heat exchange channel 121 along the first direction, the heat exchange medium in the first heat exchange channel 121 can flow along the first direction to effectively dissipate heat from the battery module 11 in the same battery pack 1, which is beneficial to improving the heat dissipation effect of the heat exchange medium on the battery module 11.

[0070] Accordingly, by extending the second heat exchange channel 122 along the first direction, for example, extending the electric heating element 123 along the first direction, or by providing multiple electric heating elements 123 arranged sequentially along the first direction in the same second heat exchange channel 122, the electric heating elements 123 in the second heat exchange channel 122 can effectively heat the battery module 11 in the same battery pack 1 along the first direction, which is beneficial to improving the heating effect of the electric heating element 123 on the battery module 11.

[0071] Furthermore, by extending both the first heat exchange channel 121 and the second heat exchange channel 122 along the first direction and arranging them at intervals along the second direction, the space of the base plate 12 in the second direction can be fully utilized, allowing the first heat exchange channel 121 and the second heat exchange channel 122 to be arranged in an orderly manner, thus avoiding interference between the first heat exchange channel 121 and the second heat exchange channel 122.

[0072] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the thickness of the base plate 12 in the vertical direction is greater than 7 mm. For example, the thickness of the base plate 12 in the vertical direction can be 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc.

[0073] By making the thickness of the base plate 12 in the vertical direction greater than 7mm, the base plate 12 can have a certain structural strength to effectively support the battery module 11 located above the base plate 12. It can also make the thickness of the heat exchange channel in the vertical direction larger, for example, so that the flow cross section of the heat exchange channel can be larger, so that the heat exchange medium can flow more smoothly in the heat exchange channel. It can also facilitate the installation of components such as electric heating element 123 inside the heat exchange channel.

[0074] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the height dimension of the heat exchange channel in the vertical direction is greater than 4 mm. For example, the height dimension of the heat exchange channel in the vertical direction can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, etc.

[0075] By making the height dimension of the heat exchange channel in the vertical direction greater than 4mm, the thickness dimension of the heat exchange channel in the vertical direction can be made larger. For example, the flow cross section of the heat exchange channel can be made larger so that the heat exchange medium can flow more smoothly in the heat exchange channel. It can also facilitate the installation of components such as electric heating elements 123 inside the heat exchange channel.

[0076] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the width of the heat exchange channel is greater than 20 mm. For example, the width of the heat exchange channel can be 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, etc.

[0077] By making the width of the heat exchange channel greater than 20mm, the flow cross-section of the heat exchange channel can be larger, so that the heat exchange medium can flow more smoothly in the heat exchange channel. It can also facilitate the installation of components such as electric heating elements 123 inside the heat exchange channel.

[0078] Reference Figure 4 , Figure 6 , Figure 8 and Figure 9 According to some embodiments of the present invention, the bottom surface of the bottom plate 12 located at the bottommost point is provided with a heat insulation layer 126, which can keep the bottommost battery pack 1 warm and reduce heat loss. It can also buffer the bottommost battery pack 1 and resist the impact of external impact on the bottommost battery pack 1 to a certain extent.

[0079] Reference Figures 4-7 According to some embodiments of the present invention, the outer frame 13 and the bottom plate 12 of the same box 12a are independently molded parts, so that the outer frame 13 and the bottom plate 12 can be processed and manufactured separately, which can reduce the manufacturing difficulty of the box 12a and make the manufacturing of the outer frame 13 and the bottom plate 12 more convenient.

[0080] Reference Figures 4-7 According to some embodiments of the present invention, the bottom plate 12 of the same box 12a is welded to the outer frame 13 of the box, which makes the connection between the bottom plate 12 of the same box 12a and the outer frame 13 of the box simple and has strong stability.

[0081] Reference Figure 8 , Figure 9 and Figure 12 In some embodiments, the outer frame 13 of the box includes an outer frame 132 and a connecting plate 135. The connecting plate 135 is connected to the bottom of the outer frame 132 and is located inside the outer frame 132. The connecting plate 135 is connected to the bottom plate 12. By making the outer frame 13 of the box include an outer frame 132 and a connecting plate 135 and the connecting plate 135 is located inside the outer frame 132, the assembly of the bottom plate 12 and the outer frame 13 of the box can be made more convenient. For example, the connecting plate 135 can realize the quick positioning and assembly of the bottom plate 12 and the outer frame 13 of the box, reducing the assembly difficulty.

[0082] For example, the connecting plate 135 is welded to the base plate 12, which makes the connection between the connecting plate 135 and the base plate 12 simple and has strong stability.

[0083] For example, a third heat exchange channel is formed inside the connecting plate 135. The third heat exchange channel is connected to the first heat exchange channel 121. This can increase the total flow cross-section of the heat exchange channel, allowing the heat exchange medium to flow more smoothly in the heat exchange channel, which is beneficial to further improve the heat dissipation effect of the battery module 11.

[0084] Reference Figures 4-7 According to some embodiments of the present invention, the outer frame 13 of the box is an integrally molded part, which can give the outer frame 13 of the box a strong structural strength and can eliminate the assembly process between the side walls of the outer frame 13 of the box.

[0085] Reference Figures 4-7 According to some embodiments of the present invention, the outer frame 13 of the box is an extruded profile. By making the outer frame 13 of the box a protruding profile, the outer frame 13 of the box can be integrally formed by the extrusion process, so that the outer frame 13 of the box has strong structural strength and the manufacturing process is relatively simple.

[0086] Reference Figures 4-7 According to some embodiments of the present invention, the outer frame 13 of the housing is made of aluminum or aluminum alloy. Since aluminum has a low density, by making the outer frame 13 of the housing of aluminum or aluminum alloy, the weight of the outer frame 13 of the housing can be reduced, which is beneficial to the lightweighting of the battery device 100.

[0087] Reference Figure 4 , Figure 10 and Figure 11 According to some embodiments of the present invention, the top cover 2 is a heat-conducting plate, and a heat exchange channel 22 for the flow of heat exchange medium is formed inside the top cover 2. The top cover 2 is thermally connected to the battery cell 111 in the same battery pack 1.

[0088] By making the top cover 2 a heat-conducting plate and thermally connecting the top cover 2 with the battery cells 111 in the same battery pack 1, the top cover 2 can conduct heat transfer to the battery cells 111 in the same battery pack 1. This allows the heat generated by the battery cells 111 in the same battery pack 1 to be transferred to the heat exchange channel 22 in the top cover 2. The heat exchange medium in the heat exchange channel 22 can exchange heat for the battery module 11. For example, when the temperature of the battery module 11 is too high, the heat generated by the battery module 11 can be quickly transferred to the heat exchange channel 22 through the top cover 2, so that the heat exchange medium can absorb the heat of the battery module 11 and achieve the heat dissipation effect of the battery module 11.

[0089] By providing a heat exchange channel 22 inside the top cover 2, the space inside the top cover 2 can be fully utilized. While sealing the opening 131 of the outer frame 13 of the same battery pack 1, it also has the function of heat exchange for the battery cells 111. There is no need to set up a separate heat exchange plate, which reduces the number of parts and helps to reduce the overall weight of the battery device 100 and reduce costs.

[0090] Reference Figure 4 , Figure 10 and Figure 11According to some embodiments of the present invention, an exhaust groove 21 is formed on the lower side of the top cover 2, and the pressure relief valve on the battery cell 111 located below the top cover 2 faces the exhaust groove 21.

[0091] When the pressure in the battery cell 111 exceeds the set pressure, the pressure relief valve opens and discharges high-temperature, high-pressure gas, thereby releasing the internal pressure of the battery cell 111. By forming an exhaust groove 21 on the lower side of the top cover 2, and having the pressure relief valve on the battery cell 111 located below the top cover 2 facing the exhaust groove 21, the released high-temperature, high-pressure gas can flow directly and smoothly into the exhaust groove 21, facilitating subsequent centralized discharge and preventing disorderly diffusion of gas within the housing 12a, which is beneficial for improving the safety and reliability of the battery device 100.

[0092] Reference Figure 4 , Figure 10 and Figure 11 According to some embodiments of the present invention, the exhaust groove 21 extends along a first direction, and the width of the exhaust groove 21 along a second direction is greater than 40 mm. For example, the width of the exhaust groove 21 along the second direction can be 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, etc.

[0093] By extending the exhaust groove 21 along the first direction, a continuous elongated airflow channel can be formed in the exhaust groove 21 along the first direction, so that the gas discharged by the pressure relief valves of the multiple battery cells 111 arranged along the first direction can flow into the exhaust groove 21 more directly and smoothly. Furthermore, by making the width of the exhaust groove 21 along the second direction greater than 40mm, the flow cross section of the exhaust groove 21 is made larger, so that the gas can flow more smoothly in the exhaust groove 21, reducing the flow resistance of the gas in the exhaust groove 21.

[0094] Reference Figure 4 , Figure 10 and Figure 11 According to some embodiments of the present invention, the distance between the pressure relief valve facing the exhaust groove 21 and the top cover 2 in the vertical direction is greater than 5 mm. For example, the distance between the pressure relief valve facing the exhaust groove 21 and the top cover 2 in the vertical direction can be 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0095] By ensuring that the distance between the pressure relief valve facing the exhaust groove 21 and the top cover 2 in the vertical direction is greater than 5mm, a relatively sufficient flow space can be reserved between the pressure relief valve and the exhaust groove 21. For example, when the pressure relief valve releases pressure, the high-temperature and high-pressure gas can flow quickly and smoothly toward the exhaust groove 21, effectively preventing the gas from accumulating locally at the outlet of the pressure relief valve and forming a pressure blockage, which is beneficial to improving the safety and reliability of the battery device 100.

[0096] Reference Figure 4 , Figure 10 and Figure 11 According to some embodiments of the present invention, the exhaust grooves 21 are a plurality of grooves spaced apart along the second direction. By making the exhaust grooves 21 a plurality of grooves spaced apart along the second direction, the space in the second direction can be fully utilized, the total flow area of ​​the exhaust grooves 21 can be increased, and the gas flow can be made smoother.

[0097] For example, the battery pack 1 located at the top has multiple battery modules 11 arranged sequentially along the second direction. By making multiple venting grooves 21 spaced apart along the second direction, the number of venting grooves 21 can be the same as the number of battery modules 11 and correspond one-to-one. This ensures that the pressure relief valve of each battery cell 111 in each battery module 11 has a corresponding venting groove 21. This allows the gas in each area to flow independently, reducing or avoiding the possibility of airflow interference, making the gas discharge process smoother, and also dispersing high-temperature gas and impurities, reducing the risk of local heat accumulation, and effectively improving the safety and reliability of the battery device 100.

[0098] Reference Figures 1-4 According to some embodiments of the present invention, two adjacent battery packs 1 are detachably connected, which makes it more convenient to maintain or replace one of the battery packs 1 in the future.

[0099] For example, if one of the battery packs 1 malfunctions and needs maintenance or replacement, by making the two adjacent battery packs 1 detachably connected, only the battery pack 1 that needs maintenance or replacement needs to be removed for repair or replacement, without having to remove the two adjacent battery packs 1 at the same time.

[0100] Reference Figures 1-4 According to some embodiments of the present invention, the housings 12a of two adjacent battery packs 1 are connected by fasteners, which makes the connection between the housings 12a of two adjacent battery packs 1 simple and has strong stability, and also enables the detachable connection of two adjacent battery packs 1.

[0101] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the outer frame 13 of the housing includes an outer frame 132, an outer reinforcing beam 133 and a connecting flange 134. The outer reinforcing beam 133 is connected to the bottom of the outer frame 132 and is located on the outside of the outer frame 132. A cavity 1332 is formed inside the outer reinforcing beam 133. The connecting flange 134 is connected to the top of the outer frame 132 and is located on the outside of the outer frame 132. The outer reinforcing beams 133 of two adjacent battery packs 1 are connected to the connecting flange 134.

[0102] By including an outer frame 132, an outer reinforcing beam 133, and a connecting flange 134 in the outer frame 13, the outer reinforcing beam 133 and the connecting flange 134 can enhance the overall structural strength of the outer frame 13 to a certain extent. Furthermore, by placing the outer reinforcing beam 133 and the connecting flange 134 on the outside of the outer frame 132, the operating space outside the housing 12a is larger, making it easier to connect two adjacent battery packs 1 and reducing the assembly difficulty of two adjacent battery packs 1.

[0103] Furthermore, by forming a cavity 1332 in the outer reinforcing beam 133, the outer reinforcing beam 133 can have higher structural strength and reduce its own weight, so that the outer reinforcing beam 133 can better meet the requirements of structural strength and lightweight.

[0104] In addition, by placing the outer reinforcing beam 133 and the connecting flange 134 on the outside of the outer frame 132, the space inside the outer frame 13 can be avoided. This enhances the structural strength of the outer frame 13 and allows for the placement of as many battery cells 111 as possible inside the outer frame 13, which is beneficial for improving the energy density of the battery device 100.

[0105] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 In some embodiments, the outer frame 132 is formed with a reinforcing bulge 1321, which protrudes outward toward the outer side of the outer frame 132, thereby enhancing the overall structural strength of the outer frame 132 to a certain extent.

[0106] For example, the thickness dimension of the outer frame 132 in the second direction is 'a', and the wall thickness dimension of the outer frame 132 is 'b', where a and b satisfy: a / b = 2.5~3.5. By ensuring that a and b satisfy: a / b = 2.5~3.5, the thickness dimension of the reinforcing bulge 1321 can be made moderate. This effectively enhances the structural strength of the outer frame 132 while maintaining a moderate thickness dimension in the second direction, resulting in a smaller space occupied by the outer frame 132 and reducing its impact on the external space of the battery device 100.

[0107] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the outer reinforcing beam 133 is located on opposite sides of the outer frame 132 along the second direction, and the connecting flange 134 is located on opposite sides of the outer frame 132 along the second direction. Both the outer reinforcing beam 133 and the connecting flange 134 extend along the first direction. By positioning the outer reinforcing beam 133 on opposite sides of the outer frame 132 along the second direction, and the connecting flange 134 on opposite sides of the outer frame 132 along the second direction, with both the outer reinforcing beam 133 and the connecting flange 134 extending along the first direction, a connecting structure can be formed on opposite sides of the outer frame 132 along the second direction, which can enhance the connection stability and reliability of two adjacent battery packs 1. Furthermore, reinforcing structures can be provided on opposite sides of the outer frame 132 along the second direction to form a symmetrical structure, which can distribute the load more evenly and avoid the possibility of deformation caused by uneven stress on one side of the outer frame 132 along the second direction, effectively extending the service life of the housing 12a.

[0108] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the thickness of the outer reinforcing beam 133 in the vertical direction is greater than 20 mm, and the width of the outer reinforcing beam 133 is greater than 25 mm. For example, the thickness of the outer reinforcing beam 133 in the vertical direction can be 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, etc., and the width of the outer reinforcing beam 133 can be 26 mm, 27 mm, 22 mm, 28 mm, 30 mm, etc.

[0109] By making the thickness of the outer reinforcing beam 133 in the vertical direction greater than 20mm and the width of the outer reinforcing beam 133 greater than 25mm, the cross-sectional size of the outer reinforcing beam 133 can be made larger. The larger cross-sectional size can make the outer reinforcing beam 133 have stronger structural strength, such as effectively resisting external impacts. It can also increase the effective contact area between the outer reinforcing beam 133 and the connecting flange 134, which is beneficial to improving the connection strength between the outer reinforcing beam 133 and the connecting flange 134.

[0110] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the connecting flange 134 is provided with a plurality of first connecting holes 1341, which are arranged at intervals along the circumference of the housing 12a. The outer reinforcing beam 133 is provided with a plurality of second connecting holes 1331, which are arranged at intervals along the circumference of the housing 12a. The plurality of first connecting holes 1341 and the plurality of second connecting holes 1331 are respectively connected by fasteners.

[0111] By connecting multiple first connection holes 1341 and multiple second connection holes 1331 with fasteners, the connection between the connecting flange 134 and the outer reinforcing beam 133 can be simplified and has strong stability. It can also realize the detachable connection of two adjacent battery packs 1, making it more convenient to maintain or replace one of the battery packs 1 in the future.

[0112] Furthermore, by providing multiple first connection holes 1341 on the connecting flange 134 and multiple second connection holes 1331 on the outer reinforcing beam 133, and by arranging the multiple first connection holes 1341 and multiple second connection holes 1331 at intervals along the circumference of the housing 12a, the connecting flange 134 and the outer reinforcing beam 133 can have multiple connection points. This can effectively enhance the connection strength and stability between the housings 12a of two adjacent battery packs 1, and also make the stress distribution between the two adjacent battery packs 1 more uniform. For example, it can be more uniformly distributed along the circumference of the housing 12a, rather than concentrated in one place, reducing or avoiding the possibility of damage to a single first connection hole 1341 or second connection hole 1331 due to excessive stress concentration.

[0113] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the distance between two adjacent second connecting holes 1331 is greater than 60 mm. For example, the distance between two adjacent second connecting holes 1331 can be 61 mm, 62 mm, 63 mm, 64 mm, 65 mm, etc.

[0114] By making the distance between two adjacent second connecting holes 1331 greater than 60mm, the distance between the two adjacent second connecting holes 1331 can be larger, which can increase the operating space, making the installation or removal of fasteners more convenient. It can also reduce or avoid the possibility of the outer reinforcing beam 133 cracking due to the stress superposition of the two adjacent second connecting holes 1331.

[0115] Reference Figure 1 , Figure 4 , Figure 7 and Figure 12 According to some embodiments of the present invention, the diameter of the second connecting hole 1331 is greater than 10 mm. For example, the diameter of the second connecting hole 1331 can be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0116] By making the diameter of the second connecting hole 1331 greater than 10mm, larger fasteners can be accommodated, which effectively improves the connection strength between the connecting flange 134 and the outer reinforcing beam 133.

[0117] Reference Figure 4 , Figure 5 and Figure 7According to some embodiments of the present invention, a reinforcing beam 14 is provided inside the housing 12a. The reinforcing beam 14 is disposed on the bottom plate 12 and extends along the second direction. The two ends of the reinforcing beam 14 in the length direction are connected to the outer frame 13 of the housing. The reinforcing beam 14 is used to fix the battery module 11.

[0118] By providing a reinforcing beam 14 inside the box 12a, the reinforcing beam 14 is located on the bottom plate 12 and extends along the second direction. The two ends of the reinforcing beam 14 in the length direction are connected to the outer frame 13 of the box. The reinforcing beam 14 can enhance the overall structural strength of the box 12a and effectively improve the box 12a's ability to resist bending and deformation.

[0119] Furthermore, by connecting the reinforcing beam 14 to the battery module 11, the reinforcing beam 14 can serve as an installation carrier for the battery module 11, making it easier to assemble the battery module 11 within the housing 12a. The reinforcing beam 14 can also limit and secure the battery module 11, reducing or preventing the possibility of displacement of the module under conditions such as vibration or external impact, thereby improving the stability of the battery module 11 inside the housing 12a.

[0120] In addition, by extending the reinforcing beam 14 along the second direction and connecting both ends of the reinforcing beam 14 in the length direction to the outer frame 13 of the housing, the reinforcing beam 14 can also transfer the load of the battery module 11 to the outer frame 13 of the housing, avoiding the load concentration on the bottom plate 12, which can optimize the overall stress and help extend the service life of the bottom plate 12.

[0121] For example, the reinforcing beam 14 is provided with fastening bolts 141, which extend in the vertical direction and are fixedly connected to the module end plate of the battery module 11. This makes the connection between the reinforcing beam 14 and the battery module 11 simple and has strong stability.

[0122] Reference Figures 1-4 According to some embodiments of the present invention, the battery pack 1 consists of two units arranged vertically.

[0123] By having two battery packs 1 arranged vertically, and by having the bottom plate 12 of the upper battery pack 1 cover the opening 131 of the outer frame 13 of the lower battery pack 1, the energy storage capacity of the battery device 100 can be increased. Furthermore, the cover plate of the lower battery pack 1 can be eliminated, which can effectively reduce the overall weight of the battery device 100 and reduce manufacturing costs.

[0124] In addition, by forming a heat exchange channel 22 in the top cover 2 and a heat exchange passage in the bottom plate 12, the heat exchange plate is integrated with the top cover 2 and the bottom plate 12, which eliminates the need for additional heat exchange plates. While the top cover 2 and the bottom plate 12 respectively cover the opening 131 of the battery pack 1 located below them, they can also achieve the effect of heat exchange for the corresponding battery module 11, which can further reduce the weight of the battery device 100.

[0125] Reference Figure 14 According to a second aspect embodiment of the present invention, the electrical device 1000 includes the battery device 100 according to the first aspect embodiment of the present invention described above.

[0126] According to the embodiments of the present invention, the power device 1000, by providing the above-mentioned battery device 100, has a large energy storage capacity, a light weight and a low manufacturing cost, which can fully meet the high power consumption requirements of the power device 1000 and help to achieve the lightweighting of the power device 1000.

[0127] Reference Figure 14 According to some embodiments of the present invention, the electrical device 1000 is a vehicle.

[0128] For example, the electrical device 1000 can be a commercial vehicle, and the battery device 100 is located on the body 200 of the commercial vehicle. Since commercial vehicles have high energy requirements for the battery device 100, by including the aforementioned electrical device 1000 in the commercial vehicle, the requirements for large capacity and long range of the whole vehicle can be met more fully. Moreover, the structure of the battery device 100 is relatively compact and occupies less space, which is conducive to the layout optimization of the commercial vehicle.

[0129] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 this invention.

[0130] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0131] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0132] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0133] 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 the invention. 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.

[0134] Although embodiments of the invention 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 the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized by, include: Multiple battery packs are arranged sequentially in a vertical direction. Each battery pack includes a housing and a battery module disposed within the housing. The battery module includes multiple individual battery cells. The housings of two adjacent battery packs are connected. The housing includes a bottom plate and an outer frame. The bottom plate is disposed at the bottom of the outer frame and connected to the outer frame. An opening is formed at the top of the outer frame. The bottom plate of the upper battery pack in two adjacent battery packs is covered by the opening of the lower battery pack. A top cover that covers the opening of the battery pack located on the uppermost side.

2. The battery device according to claim 1, characterized by The base plate is a heat-conducting plate, and a heat exchange channel is formed inside the base plate. The heat exchange channel is used for the flow of heat exchange medium or for accommodating electric heating elements. The base plate is thermally connected to the battery module in the same battery pack.

3. The battery device of claim 2, wherein, The base plate is thermally connected to the battery module in the adjacent battery pack below.

4. The battery device of claim 2, wherein Each of the heat exchange channels within the base plate includes a first heat exchange channel for the flow of heat exchange medium.

5. The battery device of claim 4, wherein, The heat exchange channel located in the bottom plate at the lowest side includes a second heat exchange channel, and the electric heating element is provided in the second heat exchange channel.

6. The battery device of claim 5, wherein, The second heat exchange channel extends along the first direction. The second heat exchange channel consists of multiple channels arranged at intervals along the second direction. The distance between two adjacent second heat exchange channels along the second direction is greater than 100mm. The first direction, the second direction, and the up and down direction intersect each other.

7. The battery device according to claim 5, characterized in that, The bottom plate located at the lowest side has an installation opening formed on at least one side along the first direction. The installation opening is opposite to and communicates with the second heat exchange channel. A sealing element is provided at the installation opening to seal the installation opening. And / or, the first heat exchange channel and the first heat exchange channel both extend along the first direction, the first heat exchange channel and the first heat exchange channel are arranged at intervals along the second direction, and the first direction, the second direction and the up and down direction intersect each other.

8. The battery device according to claim 2, characterized in that, The thickness of the base plate in the vertical direction is greater than 7 mm; and / or the height of the heat exchange channel in the vertical direction is greater than 4 mm; and / or the width of the heat exchange channel is greater than 20 mm.

9. The battery device according to claim 1, characterized in that, The outer frame and the bottom plate of the same box are independently molded parts.

10. The battery device according to claim 9, characterized in that, The bottom plate of the same box body is welded to the outer frame of the box body.

11. The battery device according to claim 1, characterized in that, The outer frame of the box is a one-piece molded part; and / or, the outer frame of the box is an extruded profile; and / or, the outer frame of the box is an aluminum part or an aluminum alloy part.

12. The battery device according to claim 1, characterized in that, The top cover is a heat-conducting plate, and a heat exchange channel for the flow of heat exchange medium is formed inside the top cover. The top cover is thermally connected to the individual battery cells in the same battery pack.

13. The battery device according to claim 1, characterized in that, An exhaust groove is formed on the lower side of the top cover, and the pressure relief valve on the battery cell located below the top cover faces the exhaust groove.

14. The battery device according to claim 13, characterized in that, The exhaust groove extends along a first direction, and the width of the exhaust groove along a second direction is greater than 40 mm; and / or, the pressure relief valve facing the exhaust groove and the top cover are spaced more than 5 mm apart along the vertical direction; and / or, the exhaust groove is a plurality of grooves spaced apart along the second direction.

15. The battery device according to any one of claims 1-14, characterized in that, The two adjacent battery packs are detachably connected.

16. The battery device according to claim 15, characterized in that, The housings of two adjacent battery packs are connected by fasteners.

17. The battery device according to any one of claims 1-14, characterized in that, The outer frame of the enclosure includes an outer frame body, an outer reinforcing beam, and a connecting flange. The outer reinforcing beam is connected to the bottom of the outer frame body and located on the outside of the outer frame body. A cavity is formed inside the outer reinforcing beam. The connecting flange is connected to the top of the outer frame body and located on the outside of the outer frame body. The outer reinforcing beams of two adjacent battery packs are connected to the connecting flange.

18. The battery device according to claim 17, characterized in that, The outer reinforcing beams are located on opposite sides of the outer frame along the second direction, and the connecting flanges are located on opposite sides of the outer frame along the second direction. Both the outer reinforcing beams and the connecting flanges extend along the first direction. And / or, the thickness of the outer reinforcing beam along the vertical direction is greater than 20mm, and the width of the outer reinforcing beam is greater than 25mm.

19. The battery device according to claim 17, characterized in that, The connecting flange is provided with a plurality of first connecting holes, which are arranged at intervals along the circumference of the housing. The outer reinforcing beam is provided with a plurality of second connecting holes, which are arranged at intervals along the circumference of the housing. The plurality of first connecting holes and the plurality of second connecting holes are respectively connected by fasteners.

20. The battery device according to claim 19, characterized in that, The distance between two adjacent second connecting holes is greater than 60 mm; and / or the diameter of the second connecting hole is greater than 10 mm.

21. The battery device according to any one of claims 1-14, characterized in that, The housing is provided with a reinforcing beam, which is located on the bottom plate and extends along the second direction. The two ends of the reinforcing beam in the length direction are connected to the outer frame of the housing. The reinforcing beam is used to fix the battery module; and / or, the battery pack consists of two units arranged vertically.

22. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1-21.

23. The electrical appliance according to claim 22, characterized in that, The electrical device is a vehicle.

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