Box assembly, battery pack and electric device

Abstract

The application provides a box assembly, a battery pack and an electric device. The box assembly comprises a shell and a heat exchange sheet; the shell has a mounting cavity, and a first opening and a second opening are arranged on the outer surface of the shell; the heat exchange sheet is located in the shell and connected with the inner surface of the shell to divide the mounting cavity into a plurality of cell mounting spaces; the heat exchange sheet is internally provided with a flow channel, and the two ends of the flow channel are respectively communicated with the first opening and the second opening. The application sets the heat exchange sheet with the flow channel in the mounting cavity, and makes the flow channel communicated with the outside through the first opening and the second opening arranged on the surface of the shell, so that on the basis of guiding the gas to the surrounding of the cells to quickly exchange heat with the cells, the impurities such as dust and water vapor can also be prevented from entering the inside of the battery pack along the flow path of the gas, so as to improve the protection capability of the battery pack.

Description

Technical Field

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

[0002] The battery pack includes a housing assembly with mounting cavities and multiple battery cells housed within those cavities. During use, excessively high or low operating temperatures can negatively impact the normal operation of the battery cells. Therefore, thermal management of the battery cells is necessary, such as cooling or heating them to ensure they operate at suitable temperatures.

[0003] Currently, gas is used as a heat exchange medium for thermal management of battery cells. This involves blowing the gas onto the cell surface via a fan to carry away heat from the surrounding area or to heat the cell itself. However, this allows dust and moisture to easily enter the battery pack using gas-based thermal management, resulting in lower protection performance and making it unsuitable for applications with high protection requirements. Utility Model Content

[0004] The embodiments of this application provide a housing assembly, a battery pack, and an electrical device, which can improve the protective performance of the battery pack by using gas for thermal management.

[0005] In a first aspect, embodiments of this application provide a housing assembly, which includes a housing and heat exchange fins. The housing has a mounting cavity, and a first opening and a second opening are provided on the outer surface of the housing. The heat exchange fins are located inside the housing and connected to the inner surface of the housing to divide the mounting cavity into multiple cell mounting spaces. A flow channel is provided inside the heat exchange fins, and the two ends of the flow channel are respectively connected to the first opening and the second opening. In this way, while guiding gas to the vicinity of the cells for rapid heat exchange, it also prevents impurities such as dust and moisture from entering the battery pack along the gas flow path, thereby improving the battery pack's protection capability.

[0006] In some embodiments, the housing includes a casing and a cover; the cover closes to the casing to define a mounting cavity; wherein a first opening and a second opening are respectively provided on the casing and the cover; the two ends of the heat exchange fins are respectively connected to the casing and the cover. This allows gas to flow along the height direction of the battery cell, thereby ensuring that the temperature of the gas exchanging heat with each battery cell is consistent, which helps to improve the temperature uniformity of each battery cell, and consequently improves the performance consistency of each battery cell.

[0007] In some embodiments, the heat exchange plate includes a first plate and a second plate. One end of the first plate is connected to a housing, and a first channel is provided within the first plate, with one end of the first channel communicating with a first opening. One end of the second plate is connected to a housing cover, and a second channel is provided within the second plate, with one end of the second channel communicating with a second opening. The other end of the first plate is connected to the other end of the second plate, so that the other end of the first channel communicates with the other end of the second channel. Thus, the heat exchange plate consists of a first plate connected to the housing and a second plate connected to the housing cover. This allows the first plate and the housing cover to be connected as a single unit, and the second plate and the housing cover to be connected as a single unit. By closing the housing cover and housing, the first plate and the second plate are connected, thus communicating with the second channel. This improves the ease of connection between the heat exchange plate and the housing cover and housing, reducing the difficulty of connection.

[0008] In some embodiments, the end of the first piece near the lid is inserted into the end of the second piece away from the lid. This not only enables communication between the first and second channels but also increases the connection area between the first and second pieces, thereby improving the reliability of the connection between them.

[0009] In some embodiments, a socket is provided at the end of the first piece facing the lid, and an insert is provided at the end of the second piece away from the lid, the insert being inserted into the socket. This makes the insertion structure between the first and second pieces simple and easy to manufacture.

[0010] In some embodiments, the socket has a first bottom surface facing the cover; the insert has a first surface near the centerline of the flow channel, the end of the first surface near the cover smoothly transitions to the inner wall of the first channel, and the end of the first surface away from the cover and the end of the first bottom surface near the centerline define a clearance opening. Thus, airflow disturbance can be generated based on this opening to increase the contact effect between the gas and the clearance opening, thereby enhancing heat exchange efficiency.

[0011] In some embodiments, the clearance has a width dimension in the radial direction of the flow channel, and the width dimension of the clearance gradually decreases along the direction close to the cover. In this way, the clearance can be formed on the heat exchange fins with a gently transitioning structure to reduce stress concentration and improve the stress state of the housing assembly.

[0012] In some embodiments, the insert extends in a ring shape along the periphery of the end face of the second piece away from the lid. This increases the mating area between the first and second pieces, thereby improving the connection reliability between the first and second pieces and ensuring uniform force distribution at the connection point.

[0013] In some embodiments, the socket has a first sidewall facing the centerline of the flow channel, the first sidewall being a conical surface; the small-diameter end of the first sidewall is disposed away from the cover; wherein the insert has a second surface facing away from the centerline of the flow channel, and the first sidewall fits against the second surface. Thus, the insertion of the insert can be guided by the large-diameter end of the first sidewall, thereby improving the smoothness of the connection between the first and second pieces.

[0014] In some embodiments, the insert block and the socket are interference-fitted. This eliminates the gap between the mating parts of the first and second pieces, thereby improving the positional stability of the cover relative to the housing. Furthermore, the interference fit ensures a seal at the connection between the first and second pieces, simplifying the sealing structure and eliminating the need for additional seals. This reduces the number of components in the housing assembly, simplifies the assembly process, and improves assembly efficiency.

[0015] In some embodiments, the interference fit between the insert block and the socket 1 is 0.02mm to 0.07mm. This achieves both a seal at the connection between the first and second pieces and an appropriate interference fit between them to ensure reliable sealing. It also controls compressive stress, thereby improving the structural reliability of the housing assembly.

[0016] In some embodiments, a sealant layer is provided between the insert and the socket. This sealant layer improves the sealing of the connection between the first and second pieces, thereby enhancing the reliability of the housing assembly.

[0017] In some embodiments, the socket has a first bottom surface facing the cover, and a sealant layer is disposed between the first bottom surface and the insert. This arrangement of the sealant layer close to the flow channel effectively prevents fluid from entering between the first bottom surface and the insert, thereby reducing the erosion caused by fluid at the mating area between the first and second pieces.

[0018] In some embodiments, the sealant layer is made of silicone sealant. Silicone sealant has high elasticity and good deformation capacity, allowing the sealant layer to adhere tightly to the minute irregularities of the sealing surface even under vibration, thereby effectively preventing fluid penetration.

[0019] In some embodiments, the thickness of the sealant layer is 0.1mm to 0.2mm. This achieves a seal at the connection between the first and second pieces while ensuring an appropriate sealant layer thickness to guarantee sealing reliability and control sealing costs. In some embodiments, the end face of the first piece facing the lid abuts against the end face of the second piece facing away from the lid. This increases the support area of ​​the lid on the lid, thereby improving the reliability of the connection between the lid and the lid.

[0020] In some embodiments, there are multiple first openings, multiple second openings, and multiple heat exchange plates. Each of the multiple first openings and multiple second openings corresponds one-to-one with a multiple heat exchange plate, and the two ends of the flow channel of each heat exchange plate are connected to the corresponding first opening and second opening, respectively. In this way, the number of flow channels in the battery pack can be increased to improve the heat exchange effect of the battery pack.

[0021] In some embodiments, one end of the heat exchange fin is inserted into the first opening, and the other end of the heat exchange fin is inserted into the second opening. This increases the mating area between the heat exchange fin and the housing, thereby improving the reliability of the connection between the heat exchange fin and the housing, and thus improving the positional stability of the heat exchange fin.

[0022] In some embodiments, the heat exchange fins are interference-fitted with at least one of the first opening and the second opening. This interference fit eliminates gaps at the connection between the heat exchange fins and the housing, improving the sealing of the connection and thus enhancing the protection performance of the battery pack.

[0023] In some embodiments, the end face of the heat exchange fin inserted into the first opening is flush with the outer surface of the housing where the first opening is provided; and / or, the end face of the heat exchange fin inserted into the second opening is flush with the outer surface of the housing where the second opening is provided. This improves the surface flatness of the housing, thereby enhancing the uniformity of stress distribution on the housing assembly.

[0024] In some embodiments, the heat exchange fins are welded to the housing; and / or, at least a portion of the housing is made of extruded aluminum profile. This ensures a reliable connection between the heat exchange fins and the housing.

[0025] In some embodiments, heat sinks are provided on the outer surface of the housing; and / or, the heat exchange fins are made of aluminum. This allows the heat exchange fins to have suitable structural strength while also having a low density, thus improving the energy density of the battery pack.

[0026] Secondly, embodiments of this application provide a battery pack, which includes battery cells and the aforementioned housing assembly; the battery cells are disposed within the mounting cavity and thermally coupled to heat exchange plates. In this way, while guiding gas to the vicinity of the battery cells for rapid heat exchange, it also prevents impurities such as dust and moisture from entering the battery pack along the gas flow path, thereby improving the battery pack's protective capabilities.

[0027] Thirdly, embodiments of this application provide an electrical device that includes the aforementioned battery pack. In this way, while guiding gas to the vicinity of the battery cells for rapid heat exchange, it also prevents impurities such as dust and moisture from entering the battery pack along the gas flow path, thereby improving the battery pack's protective capabilities and ultimately enhancing the reliability of the electrical device.

[0028] The beneficial effects of the embodiments of this application are as follows:

[0029] In the embodiments of this application, by providing heat exchange fins with flow channels within the mounting cavity, and allowing these flow channels to communicate with the outside through a first opening and a second opening on the outer casing surface, gas is guided to the vicinity of the battery cell for rapid heat exchange, while preventing dust, moisture, and other impurities from entering the battery pack along the gas flow path, thus enhancing the battery pack's protective capabilities. This expands the application scenarios for air-cooled battery packs. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the battery cell and heat exchange plate assembly provided in an embodiment of this application;

[0034] Figure 4 This is a structural schematic diagram of the housing assembly provided in an embodiment of this application;

[0035] Figure 5 It is along Figure 4 Sectional view of AA;

[0036] Figure 6 This is an exploded view of the housing assembly provided in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the structure of the box lid provided in an embodiment of this application;

[0038] Figure 8 This is a partial structural schematic diagram of the first sheet body provided in an embodiment of this application;

[0039] Figure 9 This is a partial structural schematic diagram of the second sheet body provided in an embodiment of this application;

[0040] Figure 10 This is a schematic diagram of the first and second pieces of the device engaging in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1000 - Electrical appliance; 200 - Controller; 300 - Motor;

[0043] 100 - Battery pack; 20 - Battery cell;

[0044] 10- Enclosure assembly;

[0045] 11-Outer shell; 111-First opening; 112-Second opening; 113-Box body; 114-Box lid;

[0046] 12-Heat exchange fin; 121-First fin body; 1211-Socket; 1212-First bottom surface; 1213-First side wall; 1214-First channel;

[0047] 122-Second sheet; 1221-Insertion block; 1222-First surface; 1223-Second surface; 1224-Second channel;

[0048] 123 - Flow channel;

[0049] 124 - Avoidance Pass;

[0050] 13-Installation cavity; 131-Cell installation space;

[0051] 14-Heat sink;

[0052] 15 - Sealant layer. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0057] In the description of the embodiments in this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0058] The following combination Figures 1 to 9 The following is a detailed description of the housing assembly 10, battery pack 100, and power supply device 1000 provided in the embodiments of this application.

[0059] Embodiments of this application provide an electrical device 1000, which includes a battery pack 100. The electrical device 1000 may be, but is not limited to, vehicles, ships, or aircraft.

[0060] like Figure 1 As shown, this application uses a vehicle as an example to illustrate the electrical device 1000. The vehicle can be a train or a car. Specifically, the car can be a gasoline car, a natural gas car, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The vehicle's interior can include a motor 300, a controller 200, and a battery pack 100. The controller 200 can be used to control the power supply from the battery pack 100 to the motor 300, and the controller 200 can also control the operation of other vehicle components using the electrical energy from the battery pack 100. The battery pack 100 can also serve as the vehicle's operating power source for the vehicle's electrical system to achieve related vehicle operations. For example, it can meet the power needs for vehicle starting, navigation, and cooling / heating.

[0061] For example, a battery pack 100 may be installed at the bottom of the vehicle.

[0062] like Figure 2As shown, in some embodiments, the battery pack 100 includes battery cells 20 and a housing assembly 10. The battery cells 20 are disposed within the housing assembly 10 and thermally coupled to the heat exchange fins 12 of the housing assembly 10, such as... Figure 3 As shown.

[0063] Thermal coupling can be understood as the transfer of heat between two objects, where the object with a higher temperature heats the object with a lower temperature, or the object with a lower temperature absorbs heat from the object with a higher temperature. Alternatively, the battery cell 20 can directly contact the heat exchange plate 12 to achieve thermal coupling, or thermally conductive adhesive can be placed between the battery cell 20 and the heat exchange plate 12 to achieve thermal coupling.

[0064] It is understood that the battery pack 100 may also include a heat exchange medium delivery device. For example, when the heat exchange medium is a liquid, the delivery device may be a water pump. The water pump delivers the heat exchange medium through a pipe to the flow channel 123 within the heat exchange plate 12, and draws the heat exchange medium in the flow channel 123 of the heat exchange plate 12 to a medium temperature regulating device to regulate the temperature of the medium (e.g., cool down or heat up). Then, the water pump delivers the temperature-regulated heat exchange medium to the flow channel 123 of the heat exchange plate 12 to heat or cool the battery cell 20, so that the temperature of the battery cell 20 is within a suitable range.

[0065] It is understood that a pressure relief valve may be installed on the housing assembly 10 for internal pressure relief. The battery cell 20 may have an explosion-proof valve for internal pressure relief.

[0066] It is understandable that there are multiple battery cells 20, and these multiple battery cells 20 are electrically connected. For example, multiple battery cells 20 can be connected in series or in parallel, or some battery cells 20 can be connected in series and some battery cells 20 can be connected in parallel.

[0067] The battery cell 20 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to this. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to this either.

[0068] The battery cell 20 includes a casing 11, an electrode assembly, and an electrolyte. The casing 11 houses the electrode assembly and the electrolyte. The electrode assembly comprises a positive electrode, a separator, and a negative electrode, stacked sequentially. The battery cell 20 primarily relies on the movement of metal ions between the positive and negative electrode plates for charging and discharging. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0069] like Figure 3 and Figure 4 As shown, an embodiment of this application provides a housing assembly 10. The housing assembly 10 includes a housing 11 and heat exchange fins 12. The housing 11 has a mounting cavity 13. A first opening 111 and a second opening 112 are provided on the outer surface of the housing 11. The heat exchange fins 12 are located inside the housing 11 and connected to the inner surface of the housing 11 to divide the mounting cavity 13 into multiple cell mounting spaces 131. A flow channel 123 is provided inside the heat exchange fins 12. The two ends of the flow channel 123 communicate with the first opening 111 and the second opening 112, respectively.

[0070] It is understood that the cell mounting space 131 is used to mount the cell 20. At least one cell 20 can be installed in each mounting space. For example, multiple cells 20 can be installed in each mounting space, and the multiple cells 20 are arranged sequentially along the surface of the heat exchange plate 12 adjacent to it.

[0071] It is understandable that when two cell mounting spaces 131 are needed, one heat exchanger 12 can be configured. When N (N is a natural number greater than 1) cell mounting spaces 131 are needed, N-1 heat exchangers 12 can be configured. For example, configuring twelve heat exchangers 12 defines thirteen cell mounting spaces 131, with three cells 20 set within each cell mounting space 131. Figure 1 As shown.

[0072] For example, the battery cell 20 is a prismatic battery cell 20. The prismatic battery cell 20 has a length dimension, a width dimension, and a height dimension. The side lines corresponding to the length dimension and the side lines corresponding to the height dimension enclose the large surface of the prismatic battery cell 20. To improve heat exchange efficiency, the large surface of the prismatic battery cell 20 can be thermally coupled to the heat exchange plate 12, so that the battery cell 20 has a large heat exchange area.

[0073] It is understood that the heat exchange medium in the flow channel 123 can be either gas or liquid. When it is liquid, good sealing between the fins and the outer casing 11 is required. When it is gas, the connection between the fins and the outer casing 11 needs to meet the dust and water protection requirements for the battery pack 100 application. For example, if the heat exchange medium is gas, the protection rating of the battery pack 100 is IP67. The first digit 6 indicates a protection level of 6 against solid foreign objects, meaning that the battery pack 100 is completely protected against the intrusion of any solid foreign objects, including dust, grit, etc. Even in dusty environments, dust cannot enter the battery pack 100 and will not affect its normal operation. The second digit 7 indicates the protection level against liquids, meaning that even if the battery pack 100 is immersed in 1m of water for 30 minutes, liquid will not enter the battery pack 100 and cause damage; the battery pack 100 will still function normally.

[0074] The heat exchange fins 12 can be integrally formed with the outer shell 11, or they can be bonded to the outer shell 11 or welded to the outer shell 11.

[0075] It is understood that the outer casing 11 may include a housing 113 and a lid 114. The first opening 111 and the second opening 112 may be respectively provided on the housing 113 and the lid 114, or both the first opening 111 and the second opening 112 may be provided on the housing 113, or both the first opening 111 and the second opening 112 may be provided on the lid 114.

[0076] It can be understood that one of the first opening 111 and the second opening 112 is the inlet for the heat exchange medium to enter the flow channel 123, and the other is the outlet for the heat exchange medium to flow out of the flow channel 123.

[0077] For example, a fan can blow gas from the first opening 111 into the flow channel 123, and the gas in the flow channel 123 can be discharged from the second opening 112.

[0078] For example, one end of the heat exchanger 12 is inserted into the first opening 111, and the other end of the heat exchanger 12 is inserted into the second opening 112. Specifically, the heat exchanger 12 is interference-fitted with both the first opening 111 and the second opening 112. The end face of the heat exchanger 12 inserted into the first opening 111 is flush with the outer surface of the outer casing 11 where the first opening 111 is located, and the end face of the heat exchanger 12 inserted into the second opening 112 is flush with the outer surface of the outer casing 11 where the second opening 112 is located.

[0079] In this embodiment, by providing a heat exchange fin 12 with a flow channel 123 within the mounting cavity 13, and allowing the flow channel 123 to communicate with the outside through a first opening 111 and a second opening 112 on the surface of the outer casing 11, gas is guided to the vicinity of the battery cell 20 for rapid heat exchange, while preventing dust, moisture, and other impurities from entering the battery pack 100 along the gas flow path, thus improving the protective capability of the battery pack 100. This expands the application scenarios of air-cooled battery packs 100.

[0080] Please see Figure 6 , Figure 6 This is an exploded view of the housing assembly 10 provided in an embodiment of this application. In some embodiments, the housing 11 includes a housing 113 and a cover 114. The cover 114 closes to the housing 113 to define a mounting cavity 13. A first opening 111 and a second opening 112 are respectively provided on the housing 113 and the cover 114. The two ends of the heat exchange fins 12 are connected to the housing 113 and the cover 114, respectively.

[0081] Specifically, the heat exchange fin 12 is a hollow fin, and its material includes, but is not limited to, aluminum, copper, and steel. The hollow structure of the hollow fin is the flow channel 123.

[0082] For example, the two ends of the heat exchange fin 12 are welded to the housing 113 and the housing cover 114, respectively, or hinged or snap-fitted. Depending on sealing requirements, a sealing element may be provided on the opposing surfaces between the heat exchange fin 12 and the housing 113 and housing cover 114.

[0083] It is understood that the above settings enable the channel to be configured to extend along the height direction of the cell 20.

[0084] In this embodiment, the above-mentioned arrangement allows the gas to flow along the height direction of the battery cell 20, thereby making the temperature of the gas exchanging heat with each battery cell 20 consistent, which helps to improve the temperature uniformity of each battery cell 20, and thus improves the performance consistency of each battery cell 20.

[0085] Please see Figures 5 to 7In some embodiments, the heat exchange plate 12 includes a first plate 121 and a second plate 122. One end of the first plate 121 is connected to the housing 113. A first channel 1214 is provided inside the first plate 121. One end of the first channel 1214 communicates with a first opening 111. One end of the second plate 122 is connected to the housing cover 114. A second channel 1224 is provided inside the second plate 122. One end of the second channel 1224 communicates with a second opening 112. The other end of the first plate 121 is connected to the other end of the second plate 122, so that the other end of the first channel 1214 communicates with the other end of the second channel 1224. In this way, the heat exchange fin 12 can be composed of a first fin 121 connected to the housing 113 and a second fin 122 connected to the housing cover 114. After the first fin 121 and the housing cover 114 are connected as one unit, the first fin 121 and the second fin 122 are connected by closing the housing cover 114 and the housing 113, thereby connecting the first channel 1214 and the second channel 1224. This improves the ease of operation in connecting the heat exchange fin 12 to the housing cover 114 and the housing 113, and reduces the difficulty of connection.

[0086] Depending on the specific application scenario, the first piece 121 and the second piece 122 can be selected to be interference-fitted to seal the mating parts between them, which facilitates fluid flow and prevents leakage. Alternatively, a sealing element can be set at the mating parts between the first piece 121 and the second piece 122.

[0087] Please see Figure 5 In some embodiments, the end of the first piece 121 near the cover 114 is inserted into the end of the second piece 122 away from the cover 114. In this way, the first channel 1214 and the second channel 1224 can be connected, and the connection surface area between the first piece 121 and the second piece 122 can be increased, so as to improve the reliability of the connection between the first piece 121 and the second piece 122.

[0088] Please see Figure 5 , Figure 8 and Figure 9 In some embodiments, a socket 1211 is provided at the end of the first piece 121 facing the cover 114. A plug 1221 is provided at the end of the second piece 122 away from the cover 114. The plug 1221 is inserted into the socket 1211. In this way, the insertion structure between the first piece 121 and the second piece 122 is simple and easy to manufacture.

[0089] Please see Figure 5 , Figure 8 and Figure 9In some embodiments, the socket 1211 has a first bottom surface 1212 facing the cover 114. The insert 1221 has a first surface 1222 near the centerline of the flow channel 123. The end of the first surface 1222 near the cover 114 smoothly transitions to the inner wall of the first channel 1214. The end of the first surface 1222 away from the cover 114 and the end of the first bottom surface 1212 near the centerline define a clearance opening 124. In this way, airflow disturbance can be formed based on this opening to increase the contact effect between the gas and the clearance opening 123, thereby enhancing heat exchange efficiency.

[0090] In addition, by setting the clearance 124, the step difference formed when the first piece 121 and the second piece 122 are connected due to processing errors and assembly errors can be avoided, thereby reducing flow resistance, improving gas flow efficiency, and thus improving heat exchange efficiency.

[0091] Please see Figure 5 In some embodiments, the clearance 124 has a width dimension in the radial direction of the flow channel 123. The width dimension of the clearance 124 gradually decreases along the direction close to the cover 114. In this way, the clearance 124 can be formed on the heat exchange fins 12 with a gently transitional structure to reduce stress concentration and improve the stress state of the housing assembly 10.

[0092] Please see Figure 7 In some embodiments, the insert 1221 extends in a ring shape along the periphery of the end face of the second piece 122 away from the cover 114. This increases the mating area between the first piece 121 and the second piece 122, thereby improving the connection reliability of the first piece 121 and the second piece 122, and making the force on the connection part between the first piece 121 and the second piece 122 uniform.

[0093] Please see Figure 5 In some embodiments, the socket 1211 has a first sidewall 1213 facing the centerline of the flow channel 123. The first sidewall 1213 is a conical surface. The small-diameter end of the first sidewall 1213 is disposed away from the cover 114. The insert 1221 has a second surface 1223 facing away from the centerline of the flow channel 123, and the first sidewall 1213 fits against the second surface 1223. Thus, the insertion of the insert 1221 can be guided by the large-diameter end of the first sidewall 1213, thereby improving the smoothness of the connection between the first piece 121 and the second piece 122.

[0094] In some embodiments, the insert 1221 and the socket 1211 are interference-fitted. This eliminates the gap between the mating parts of the first piece 121 and the second piece 122, thereby improving the positional stability of the cover 114 relative to the housing 113. Furthermore, the interference fit ensures a seal at the connection between the first piece 121 and the second piece 122. This simplifies the sealing structure between the first piece 121 and the second piece 122, eliminating the need for additional sealing elements, thus reducing the number of components in the housing assembly 10, simplifying the assembly process, and improving assembly efficiency.

[0095] Please see Figure 10 In some embodiments, the interference fit between the insert 1221 and the socket 1211 is 0.02mm to 0.07mm. This achieves both a seal at the connection between the first piece 121 and the second piece 122, and ensures an appropriate interference fit between them to guarantee reliable sealing. It also controls compressive stress, thereby improving the structural reliability of the housing assembly 10.

[0096] It can be understood that the interference is the interference on one side of the mating part between the insert 1221 and the socket 1211.

[0097] It is understood that the interference amount includes, but is not limited to, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, and 0.07mm.

[0098] Please see Figure 10 In some embodiments, a sealant layer 15 is provided between the insert 1221 and the socket 1211. In this way, the sealant layer 15 can improve the sealing of the connection between the first piece 121 and the second piece 122, thereby improving the reliability of the housing assembly 10.

[0099] Please see Figure 10 In some embodiments, the socket 1211 has a first bottom surface 1212 facing the cover 114, and a sealant layer 15 is disposed between the first bottom surface 1212 and the insert 1221. Thus, by placing the sealant layer 15 close to the flow channel 123, fluid is effectively prevented from entering between the first bottom surface 1212 and the insert 1221, thereby reducing the erosion caused by fluid on the mating portion between the first piece 121 and the second piece 122.

[0100] In some embodiments, the sealant layer 15 is made of silicone sealant. Silicone sealant has high elasticity and good deformation capacity, allowing the sealant layer 15 to adhere tightly to the minute irregularities of the sealing surface even under vibration, thereby effectively blocking fluid penetration. Furthermore, the coating thickness of the silicone sealant can be adjusted as needed (from 0.1 mm to several millimeters), enabling it to fill both tiny gaps and larger openings, offering flexibility in application.

[0101] For example, the sealant layer 15 is sprayed onto the insert 1221.

[0102] In some embodiments, the thickness D0 of the sealant layer 15 is 0.1 mm to 0.2 mm. In this way, the connection between the first piece 121 and the second piece 122 can be sealed, while the thickness of the sealant layer 15 can be appropriate to ensure sealing reliability and control sealing costs.

[0103] It is understood that the thickness D0 of the sealant layer 15 includes, but is not limited to, 0.1mm, 0.11mm, 0.13mm, 0.14mm, 0.145mm, 0.15mm, 0.16mm, 0.1mm, 0.18mm, and 0.2mm.

[0104] Please see Figure 5 In some embodiments, the end face of the first piece 121 facing the lid 114 abuts against the end face of the second piece 122 facing away from the lid 114. This increases the supporting area of ​​the lid 113 on the lid 114, thereby improving the reliability of the connection between the lid 114 and the lid 113.

[0105] Please see Figures 4 to 6 In some embodiments, there are multiple first openings 111, multiple second openings 112, and multiple heat exchange plates 12. Each of the multiple first openings 111 and multiple second openings 112 corresponds one-to-one with a multiple heat exchange plate 12. The two ends of the flow channel 123 of each heat exchange plate 12 are connected to the corresponding first opening 111 and second opening 112, respectively. In this way, the number of flow channels 123 in the battery pack 100 can be increased, thereby improving the heat exchange effect of the battery pack 100.

[0106] Specifically, multiple heat exchange fins 12 are arranged sequentially along the length of the housing 113 to divide the mounting cavity 13 into multiple battery cell mounting spaces 131. Multiple battery cells 20 are arranged within each battery cell 20 space. The multiple battery cells 20 within each battery cell 20 space are arranged sequentially along the width of the housing 113. This allows each battery cell 20 to be thermally coupled to the heat exchange fins 12.

[0107] Please see Figure 3 and Figure 4In some embodiments, one end of the heat exchange plate 12 is inserted into the first opening 111, and the other end of the heat exchange plate 12 is inserted into the second opening 112. This increases the mating area between the heat exchange plate 12 and the outer casing 11, thereby improving the reliability of the connection between the heat exchange plate 12 and the outer casing 11 and thus improving the positional stability of the heat exchange plate 12.

[0108] In some embodiments, the heat exchange fin 12 is interference-fitted with at least one of the first opening 111 and the second opening 112. In this way, the gap at the connection between the heat exchange fin 12 and the housing 11 can be eliminated by the interference fit, thereby improving the sealing of the connection between the heat exchange fin 12 and the housing 11, which can help improve the protection performance of the battery pack 100.

[0109] Specifically, one end of the heat exchange plate 12 is interference-fitted with the first opening 111, and the other end of the heat exchange plate 12 is interference-fitted with the second opening 112.

[0110] Please see Figure 3 In some embodiments, the end face of the heat exchange fin 12 inserted into the first opening 111 is flush with the outer surface of the housing 11 where the first opening 111 is located. This improves the surface flatness of the housing 11, thereby enhancing the uniformity of stress distribution on the housing assembly 10.

[0111] Please see Figure 4 In some embodiments, the end face of the heat exchange fin 12 inserted into the second opening 112 is flush with the outer surface of the housing 11 where the second opening 112 is provided. This improves the surface flatness of the housing 11, thereby enhancing the uniformity of stress distribution on the housing assembly 10.

[0112] In some embodiments, the heat exchange fins 12 are welded to the housing 11. This ensures a reliable connection between the heat exchange fins 12 and the housing 11.

[0113] In some embodiments, at least a portion of the housing 11 is made of extruded aluminum. This improves both manufacturing efficiency and the heat transfer efficiency of the housing 11, thereby enhancing the thermal management efficiency of the battery cell 20.

[0114] Among them, aluminum extruded profiles (also known as aluminum extrusion profiles) are aluminum alloy profiles produced through an extrusion process. That is, an extruder is used to extrude aluminum alloy billets or aluminum bars heated to a plastic state from a die cavity of a specific shape to form a long strip of aluminum material with a continuous structure. Its shape can be flexibly adjusted according to the die design.

[0115] Please see Figure 4 In some embodiments, heat sinks 14 are provided on the outer surface of the housing 11. This increases the area of ​​the housing 11 in contact with the outside, thereby increasing the heat exchange area of ​​the housing 11 and thus improving the heat exchange efficiency of the battery pack 100.

[0116] In some embodiments, the heat exchange fin 12 is made of aluminum. This allows the heat exchange fin 12 to have suitable structural strength while also having a low density, which is beneficial for increasing the energy density of the battery pack 100.

[0117] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A housing assembly (10), characterized in that, include: The outer casing (11) has a mounting cavity (13), and a first opening (111) and a second opening (112) are provided on the outer surface of the outer casing (11); as well as, A heat exchange plate (12) is located inside the housing (11) and connected to the inner surface of the housing (11) to divide the mounting cavity (13) into multiple battery cell mounting spaces (131); a flow channel (123) is provided inside the heat exchange plate (12), and the two ends of the flow channel (123) are respectively connected to the first opening (111) and the second opening (112).

2. The housing assembly (10) according to claim 1, characterized in that, The outer casing (11) includes: Box (113); and, A lid (114) is closed to the housing (113) to define the mounting cavity (13); The first opening (111) and the second opening (112) are respectively provided on the box body (113) and the box cover (114); the two ends of the heat exchange plate (12) are respectively connected to the box body (113) and the box cover (114).

3. The housing assembly (10) according to claim 2, characterized in that, The heat exchange plate (12) includes: The first piece (121) is connected at one end to the box (113). A first channel (1214) is provided inside the first piece (121), and one end of the first channel (1214) is connected to the first opening (111). The second piece (122) is connected at one end to the box cover (114). A second channel (1224) is provided inside the second piece (122), and one end of the second channel (1224) is connected to the second opening (112). The other end of the first piece (121) is connected to the other end of the second piece (122) so that the other end of the first channel (1214) is connected to the other end of the second channel (1224).

4. The housing assembly (10) according to claim 3, characterized in that, The end of the first piece (121) near the box cover (114) is inserted into the end of the second piece (122) away from the box cover (114).

5. The housing assembly (10) according to claim 4, characterized in that, A socket (1211) is provided at the end of the first piece (121) facing the box cover (114), and an insert (1221) is provided at the end of the second piece (122) away from the box cover (114). The insert (1221) is inserted into the socket (1211).

6. The housing assembly (10) according to claim 5, characterized in that, The socket (1211) has a first bottom surface (1212) facing the lid (114); The insert (1221) has a first surface (1222) near the center line of the flow channel (123), the end of the first surface (1222) near the cover (114) smoothly transitions to the inner wall of the first channel (1214), and the end of the first surface (1222) away from the cover (114) and the end of the first bottom surface (1212) near the center line define a clearance opening (124).

7. The housing assembly (10) according to claim 6, characterized in that, In the radial direction of the flow channel (123), the clearance opening (124) has a width dimension, which gradually decreases along the direction close to the cover (114).

8. The housing assembly (10) according to any one of claims 5-7, characterized in that, The insert (1221) extends in a ring shape along the periphery of the end face of the second piece (122) away from the box cover (114).

9. The housing assembly (10) according to claim 8, characterized in that, The socket (1211) has a first sidewall (1213) facing the center line of the flow channel (123), and the first sidewall (1213) is a conical surface; the small diameter end of the first sidewall (1213) is disposed away from the cover (114); The insert (1221) has a second surface (1223) that is away from the center line of the flow channel (123), and the first sidewall (1213) is in contact with the second surface (1223).

10. The housing assembly (10) according to claim 8, characterized in that, The insert (1221) is interference-fitted with the socket (1211).

11. The housing assembly (10) according to claim 10, characterized in that, The interference fit between the insert (1221) and the socket (1211) is 0.02mm to 0.07mm.

12. The housing assembly (10) according to claim 10, characterized in that, A sealant layer (15) is provided between the insert (1221) and the socket (1211).

13. The housing assembly (10) according to claim 12, characterized in that, The socket (1211) has a first bottom surface (1212) facing the cover (114), and the sealant layer (15) is disposed between the first bottom surface (1212) and the insert (1221).

14. The housing assembly (10) according to claim 12 or 13, characterized in that, The material of the sealant layer (15) is silicone sealant; And / or, the thickness of the sealant layer (15) is 0.1 mm to 0.2 mm.

15. The housing assembly (10) according to any one of claims 5-7, characterized in that, The end face of the first piece (121) facing the box cover (114) abuts against the end face of the second piece (122) away from the box cover (114).

16. The housing assembly (10) according to any one of claims 1-7, characterized in that, There are multiple first openings (111), multiple second openings (112) and multiple heat exchange plates (12). Each of the multiple first openings (111) and multiple second openings (112) corresponds to a single heat exchange plate (12). The two ends of the flow channel (123) of each heat exchange plate (12) are connected to the corresponding first opening (111) and second opening (112) respectively.

17. The housing assembly (10) according to any one of claims 1-7, characterized in that, One end of the heat exchange plate (12) is inserted into the first opening (111), and the other end of the heat exchange plate (12) is inserted into the second opening (112).

18. The housing assembly (10) according to claim 17, characterized in that, The heat exchange plate (12) is interference-fitted with at least one of the first opening (111) and the second opening (112).

19. The housing assembly (10) according to claim 17, characterized in that, The end face of the heat exchange plate (12) inserted into the first opening (111) is flush with the outer surface of the outer shell (11) where the first opening (111) is provided; And / or, the end face of the heat exchange plate (12) inserted into the second opening (112) is flush with the outer surface of the housing (11) where the second opening (112) is provided.

20. The housing assembly (10) according to any one of claims 1-7, characterized in that, The heat exchange plate (12) is welded to the outer shell (11); And / or, at least a portion of the housing (11) is an aluminum extrusion profile.

21. The housing assembly (10) according to any one of claims 1-7, characterized in that, Heat sinks (14) are provided on the outer surface of the outer casing (11); And / or, the heat exchange plate (12) is made of aluminum.

22. A battery pack (100), characterized in that, include: The housing assembly (10) as described in any one of claims 1-21; as well as, The battery cell (20) is disposed in the mounting cavity (13) and thermally coupled to the heat exchange plate (12).

23. An electrical appliance (1000), characterized in that, Includes the battery pack (100) as described in claim 22.

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