Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment, the battery pack comprises a box body, a plurality of battery modules and a plurality of air cooling assemblies, and the box body is internally provided with an accommodating cavity; the plurality of battery modules are arranged in the accommodating cavity; and the air cooling assemblies are arranged in the accommodating cavity, and the at least two air cooling assemblies are arranged corresponding to different battery modules. As the at least two air cooling assemblies correspond to different battery modules, at least part of the battery modules can correspond to different air cooling assemblies, so that the problem that uniform heat dissipation of a plurality of battery modules cannot be realized due to the fact that one air cooling assembly dissipates heat of the plurality of battery modules is avoided; the temperature difference between the battery modules is reduced, and the heat dissipation effect is ensured.

Description

Technical Field

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

[0002] In existing battery packs, the common thermal management systems are air cooling or liquid cooling. In air-cooled battery packs, the airflow is difficult to distribute evenly within the battery modules, resulting in low heat dissipation efficiency of the entire battery pack and difficulty in achieving uniform temperature control of the cells. Summary of the Invention

[0003] This application provides a battery pack and an electrical device to at least partially solve the above-mentioned technical problems.

[0004] Below, we will first give an overall introduction to the technical solutions of the embodiments of this application in conjunction with the battery pack.

[0005] Battery packs can be used in electrical equipment.

[0006] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0007] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0008] The vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle, etc., and this application embodiment does not limit this.

[0009] The vehicle has a battery pack installed inside. For example, the battery pack may be located at the bottom, front, or rear of the vehicle, and this application embodiment does not limit this.

[0010] To achieve the above objectives, according to a first aspect of this application, a battery pack is provided, comprising a housing, a plurality of battery modules, and a plurality of air-cooling components, wherein the housing is provided with a receiving cavity; the plurality of battery modules are disposed within the receiving cavity; and the air-cooling components are disposed within the receiving cavity, with at least two air-cooling components corresponding to different battery modules.

[0011] In the battery pack of this application embodiment, since at least two air-cooling components correspond to different battery modules, at least some of the battery modules can correspond to different air-cooling components. This avoids the problem that one air-cooling component can dissipate heat from multiple battery modules, which would prevent the uniform heat dissipation of multiple battery modules from being achieved. This reduces the temperature difference between the various battery modules and ensures the heat dissipation effect.

[0012] It should also be noted that in this embodiment, the number of battery modules and air-cooling components is the same. That is to say, one air-cooling component can independently dissipate heat from one battery module, thereby making the heat dissipation between each battery module more uniform and achieving better heat dissipation effect.

[0013] However, this design is not limited to this. In other embodiments, two battery modules may correspond to one air-cooling component, as long as the airflow of the air-cooling component is sufficient to dissipate heat from the two battery modules.

[0014] In some embodiments, the battery module includes a plurality of battery cells arranged at intervals along a first direction, wherein at least some of the adjacent battery cells are spaced apart.

[0015] Understandably, in practice, the spacing between battery cells can be set according to the distance of the air outlet of the air-cooling component. The spacing between battery cells farther from the air outlet is set to be larger, while the spacing between battery cells closer to the air outlet is set to be smaller. This can avoid the problem of uneven cooling caused by the spacing between the battery cells and the air outlet, and ensure the cooling effect of the battery pack.

[0016] In some embodiments, the air-cooling assembly includes a fan and an air guide, the fan being disposed opposite to the battery module; and the air guide is connected to the fan, with at least a portion of the air guide disposed between two adjacent cells of the same battery module to guide the air output by the fan to the space between the two adjacent cells.

[0017] In this way, the fan can output air to the battery cells, and with the help of the air guide, the air output by the fan is directed to the space between two adjacent battery cells. This prevents the cells far from the fan from being blocked by the cells close to the fan due to the arrangement of the battery cells, ensuring that all the battery cells inside the battery pack can be cooled, thus ensuring the cooling effect of the battery pack.

[0018] In some embodiments, the spacing between two adjacent cells tends to gradually increase along the direction away from the wind turbine.

[0019] In other words, in this embodiment, the spacing between the battery cells on the side farther away from the fan gradually increases. Since the wind power output by the fan will decrease with increasing distance, the gradually increasing spacing between the battery cells on the side farther away from the fan can avoid poor heat dissipation of the battery cells due to weakened wind power, thereby avoiding different heat dissipation effects of battery cells at different locations and ensuring uniform heat dissipation of the battery cells.

[0020] In some embodiments, the air guide includes a main air guide and a plurality of secondary air guides, the main air guide being connected to the fan; and each of the secondary air guides is connected to the main air guide; along the first direction, the plurality of secondary air guides are spaced apart on the main air guide; and a secondary air guide is provided between the housing and the battery cell or between two adjacent battery cells.

[0021] Understandably, in actual use, the main air guide can direct the airflow from the fan to multiple secondary air guides, ensuring that the airflow from the fan is smoothly directed to each battery, thereby guaranteeing the fan's performance.

[0022] In some embodiments, at least some of the secondary air guides have different thicknesses.

[0023] In this embodiment, it can be understood that some of the secondary air guides are located between the housing and the battery cell, so only one battery cell needs to be cooled. Other secondary air guides are located between the battery cells, so both battery cells need to be cooled. Therefore, the thickness of the secondary air guides located between the battery cells can be increased to ensure the cooling efficiency of the secondary air guides for the battery cells.

[0024] In this embodiment, the spacing between two adjacent secondary air guides tends to increase.

[0025] Understandably, in practice, the spacing between secondary air guides can be set according to the distance from the air outlet of the air-cooled component. The spacing between secondary air guides farther from the air outlet is set to be larger, while the spacing between secondary air guides closer to the air outlet is set to be smaller. This can avoid the problem of uneven air volume caused by the spacing between the secondary air guides and the air outlet, and ensure the cooling effect of the battery pack.

[0026] That is to say, in some embodiments, this application also provides an air guide, which includes a main air guide and a plurality of secondary air guides. The main air guide is used to connect to the fan. The surface of the secondary air guide is provided with air outlet holes. Each air guide is connected to the main air guide. The plurality of secondary air guides are spaced apart on the main air guide along the air supply direction of the fan. The distance between two adjacent secondary air guides tends to increase.

[0027] In the air guide component of this application embodiment, the main air guide component can guide the air from the fan to multiple secondary air guide components, so that the air from the fan can be smoothly guided to various places, thereby ensuring the performance of the fan; and the spacing between the secondary air guide components can be specifically set according to the distance of the air outlet of the fan. The spacing between the secondary air guide components farther away from the air outlet is set to be larger, while the spacing between the secondary air guide components closer to the air outlet is set to be smaller. Therefore, the problem of uneven air volume caused by the spacing between the secondary air guide components and the air outlet can be avoided, ensuring that the air volume of the air guide component is uniform.

[0028] In some embodiments, an air supply gap is provided between the secondary air guide and at least one of the battery cells.

[0029] In this way, by setting the air supply gap, it is possible to avoid the air supply path being blocked due to the secondary air guide component being too close to the battery cell, and to ensure that the air output by the fan is smoothly delivered to the battery cell, thereby ensuring the heat dissipation effect.

[0030] In some embodiments, the secondary air guide is provided with a first air supply cavity, and the surface of the secondary air guide is provided with a plurality of air supply holes, the air supply holes being opposite to the battery cell and communicating with the first air supply cavity.

[0031] In this way, by setting multiple air outlets and positioning them opposite the battery cell, the fan can smoothly pass through the first air outlet chamber and be output from the air outlets to the surface of the battery cell, thereby achieving rapid heat dissipation of the battery cell.

[0032] In some embodiments, the secondary air guide includes a first air guide plate and a second air guide plate. The first air guide plate is disposed between the housing and the battery cell, and the air supply hole is provided on the side of the first air guide plate facing the battery cell along the first direction. The second air guide plate is disposed between two adjacent battery cells, and the air supply hole is provided on the side of the second air guide plate facing the battery cell along the first direction.

[0033] It is understood that in this embodiment, the first air guide plate is set between the housing and the battery cell. Therefore, it is only necessary to set the air supply hole on the side facing the battery cell to avoid the reduction of air supply volume due to the setting of unnecessary air supply holes and to ensure the heat dissipation effect on the battery cell.

[0034] In addition, the second air guide plate is set between the battery cells. Therefore, the second air guide plate needs to be equipped with air supply holes on both sides to ensure that the second air guide plate can deliver air volume to the two adjacent battery cells, so that the battery cells on both sides can achieve the cooling effect.

[0035] Furthermore, in this embodiment, the thickness of the second air guide plate is greater than the thickness of the first air guide plate.

[0036] In this way, a larger cavity can be opened in the second air guide plate, so that more gas can flow out from the second air guide plate to better dissipate heat from the cells on both sides, while the first air guide plate can have a smaller cavity, which is sufficient to dissipate heat from the cells on one side, so that the cells in all positions can achieve uniform heat dissipation.

[0037] In some embodiments, the air supply hole includes a first air supply hole and a second air supply hole, the first air supply hole is located on the side of the second air supply hole away from the main air supply component, and the air supply area of ​​the second air supply hole is smaller than the air supply area of ​​the first air supply hole.

[0038] Thus, in this embodiment, the air from the fan is delivered to the secondary air guide through the main air guide. Therefore, setting the air delivery area of ​​the first air outlet, which is farther away from the main air guide, to be larger than the area of ​​the second air outlet, which is closer to the main air guide, can avoid the difference in air delivery volume in different areas of the same secondary air guide due to distance, thereby ensuring uniform heat dissipation of the battery cell.

[0039] In some embodiments, the ratio of the air supply area of ​​the second air supply hole to the air supply area of ​​the first air supply hole is greater than or equal to 0.93 and less than or equal to 0.97.

[0040] In this way, by setting the above parameters, the impact of distance on air volume can be reduced, while avoiding the impact of excessive differences in air supply area on air volume. This ensures that the air volume in different areas of the same air guide is uniform, thus guaranteeing the cooling effect.

[0041] In this embodiment, the opening width of the first air supply hole is 10.4 mm, and the opening width of the second air supply hole is 10 mm.

[0042] In some embodiments, both the first air supply hole and the second air supply hole are provided in multiples, and the distance between two adjacent first air supply holes is greater than the distance between two adjacent second air supply holes.

[0043] In this way, the air from the fan is delivered to the secondary air guide through the main air guide. Therefore, setting the spacing of the first air outlet, which is farther away from the main air guide, to be greater than the spacing of the second air outlet, which is closer to the main air guide, can avoid reducing the possibility of air interference from the first air outlet, thereby ensuring uniform heat dissipation of the battery cell.

[0044] In some embodiments, the first air guide plate includes a first sub-air guide plate and a second sub-air guide plate, the first sub-air guide plate being located on the side of the main airflow component closer to the fan, and the air delivery area of ​​the first sub-air guide plate being smaller than the air delivery area of ​​the second sub-air guide plate; and / or, The second air guide plate includes a third sub-air guide plate and a fourth sub-air guide plate. The third sub-air guide plate is located on the side of the main air guide component closer to the fan, and the air delivery area of ​​the third sub-air guide plate is smaller than that of the fourth sub-air guide plate.

[0045] In other words, in this embodiment, the air delivery area of ​​the secondary air guide on the side away from the fan is larger, thereby avoiding interference with the air delivery volume due to distance.

[0046] In this embodiment, due to the wind drop, the wind speed is reduced by 5% for every 100mm along the airflow direction. To ensure the same air volume, the cross-sectional area of ​​each secondary air guide should be increased. Taking the air supply area required for the first large surface of the first battery cell as A0 (i.e., the first air guide plate with a single-sided opening), the first second air guide plate has double-sided openings, and the air supply area A1 = 2*A0 / (1-5%); the air supply area of ​​the second second air guide plate is A3 = 2*A0 / (1-5%×2), and so on.

[0047] In some embodiments, the air-cooling assembly further includes a guide portion disposed between the fan and the air guide member, the guide portion being used to guide the air output by the fan to the air guide member.

[0048] In this way, the design of the guide section ensures that most of the airflow from the fan can be smoothly delivered to the air guide, thereby better guaranteeing the cooling effect of the battery cell.

[0049] In some embodiments, the guide portion is provided with a second air supply cavity and an opening communicating with the second air supply cavity, the air outlet of the fan faces the opening, the main air supply component is provided with a third air supply cavity, and the second air supply cavity is communicating with the first air supply cavity through the third air supply cavity.

[0050] In this way, during actual use, the air output by the fan can be delivered from the opening to the second air supply chamber, then from the third air supply chamber to the first air supply chamber, and finally output to the surface of the battery cell through the air supply hole. This can prevent the air output by the fan from spreading to other locations and ensure heat dissipation efficiency.

[0051] In some embodiments, the enclosure includes a housing and a cover, the housing including the accommodating cavity; and the cover covers the housing, thereby forming a closed cavity to protect the battery cell.

[0052] It should also be noted that, in this embodiment, mounting holes for the battery pack are provided on the bottom surface of the housing.

[0053] In some embodiments, the housing includes a connecting portion connected to the side of the housing near the cover for connection with the cover.

[0054] In this way, the connection can better ensure the connection between the shell and the cover, and avoid the phenomenon of unstable connection due to the small thickness of the shell.

[0055] In some embodiments, the cover includes a top surface away from the housing, and the top surface is provided with a plurality of first air outlets.

[0056] In this way, the air output by the fan can effectively cool the battery cells and then be discharged from the first air outlet on the top surface, thus preventing heat from continuously accumulating inside the casing and affecting the heat dissipation effect of the battery cells.

[0057] Furthermore, placing the first air outlet on the top surface ensures that the air output by the fan passes completely over the surface of the battery cell before exiting from the cover, thus guaranteeing the heat dissipation effect of the battery cell.

[0058] It should also be noted that the battery modules with multiple first air outlets are arranged at intervals, and each first air outlet extends along the arrangement direction of multiple cells within the same battery module.

[0059] In this way, the air flowing through the battery cell can be exhausted from the first air outlet, ensuring heat dissipation.

[0060] In some embodiments, the peripheral surface of the cover includes a first side and other sides, the fan of the air-cooling assembly is disposed near the first side, and at least one of the other sides is provided with a second air outlet.

[0061] Therefore, in this embodiment, a second air outlet is not provided on the first side near the fan, which can avoid the disturbance of air intake and exhaust and affect the heat exchange efficiency.

[0062] It is understood that in this embodiment, the cover is provided with an air outlet communicating with the accommodating cavity on the side facing the housing, and the air outlet is respectively connected to the first air outlet and the second air outlet.

[0063] In this way, the air outlet can deliver the gas inside the casing after heat dissipation to the first air outlet and the second air outlet to flow out, ensuring the heat dissipation effect of the battery cell.

[0064] In some embodiments, the housing includes a plurality of mounting ports and a plurality of filter components, the mounting ports being in communication with the air-cooling assembly; and the filter components being connected to the mounting ports, the filter components having a plurality of air inlets being in communication with the air-cooling assembly.

[0065] In this way, by setting up the filter components, larger foreign objects can be filtered out, avoiding any impact on the normal operation of the fan.

[0066] In this embodiment, the filtering component is a filter screen with multiple filter holes.

[0067] It should also be noted that, in the actual implementation process, the number of fans, the number of installation ports, and the number of filter components are consistent to ensure the effectiveness of use.

[0068] In some embodiments, the housing includes a bottom surface away from the cover, the bottom surface having a plurality of mounting recesses protruding toward a side away from the cover, at least a portion of the mounting recesses being used to accommodate the battery cell.

[0069] That is to say, in some embodiments, the present application provides a housing for a battery pack, which includes a cover and a shell. The shell is connected to the cover and includes a receiving cavity. The shell includes a bottom surface away from the cover and has a plurality of mounting recesses. The mounting recesses protrude toward the side away from the cover and are used to accommodate battery cells.

[0070] In the housing of this application embodiment, the installation recess facilitates the positioning and installation of the battery cell, prevents the battery cell from shifting during use, and ensures safety. Furthermore, since the installation recess protrudes towards the side away from the cover, the installation position can be formed without increasing the thickness of the bottom surface of the housing, thus meeting the lightweight requirements of the battery pack.

[0071] In some embodiments, the battery module includes multiple battery cells, see reference. Figure 7 and Figure 8 As shown, the housing includes a plurality of first mounting recesses and a plurality of second mounting recesses. The first mounting recesses protrude toward the side opposite to the cover and are used to accommodate the battery cell. The second mounting recesses protrude toward the side opposite to the cover and are used to accommodate the air-cooling assembly.

[0072] Thus, the design of the first and second mounting recesses facilitates the positioning and installation of the battery cell and the air guide, and prevents the battery cell and the air guide from shifting during use, ensuring safe operation.

[0073] Furthermore, since the first and second mounting recesses protrude toward the side opposite to the cover, mounting positions can be formed without increasing the thickness of the bottom surface of the housing, thus meeting the requirements for lightweight battery packs.

[0074] In addition, the battery cell and the first mounting recess, the air guide plate and the second mounting recess are fitted with a clearance (1mm clearance is used as an example in this case). The spacing between two adjacent first mounting recesses is based on the arrangement pattern of the battery cells to make corresponding holes. The gap is filled with structural adhesive to fix the battery cell and the first mounting recess.

[0075] In this embodiment, the horizontal spacing between two cells in different battery modules is the same (38mm in this case), while the spacing between two adjacent cells in the same module is different. Specifically, the spacing is = width of the inner section of the second air guide plate + sheet metal thickness of the second air guide plate (1mm in this case) * 2 + air supply gap (9mm in this case) * 2.

[0076] In some embodiments, the depth of the first mounting recess is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, the depth of the second mounting recess is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, the distance between the first mounting recess and the second mounting recess is greater than or equal to 2 mm and less than or equal to 5 mm.

[0077] In this way, by setting the above parameters, it is possible to ensure that the size is sufficient to install the battery cell or air guide while avoiding excessively large dimensions of the installation recess or protrusion, thereby better reducing the impact on the volume of the enclosure.

[0078] Furthermore, it avoids interference caused by excessively small spacing between the battery cells and the air guide components, and also prevents the cooling effect from being affected by excessively large spacing between the battery cells and the air guide components.

[0079] In some embodiments, the housing includes a bottom surface, a first sidewall, and a second sidewall, the bottom surface being away from the cover; the first sidewall is connected between the bottom surface and the cover; the second sidewall is disposed opposite to the first sidewall and is connected between the bottom surface and the cover; wherein both the first sidewall and the second sidewall are provided with two extensions to form a clamping space between the two extensions.

[0080] Thus, the extension section allows for better integration with external equipment, facilitating the lifting of the battery pack or other operations.

[0081] In some embodiments, the housing further includes a third sidewall and a reinforcing rib, the third sidewall being connected between the bottom surface and the connecting portion, and the reinforcing rib being connected between the connecting portion and the third sidewall.

[0082] This increases the overall strength of the connection, thereby improving the overall strength of the housing, and also facilitates the connection between the connection and the shell.

[0083] In this embodiment, the fan is set as an axial flow fan. In summary, the air enters from the filter component, flows through the fan by the axial suction of the axial flow fan, flows through the guide part and the main air component, then flows through the secondary air guide component, and blows vertically to the large surface of the battery cell through the air outlet on the secondary air guide component between the battery cells. Then it is discharged upward through the first air outlet, and after passing through the top cover space, it is discharged to the second air outlets on the left, right and tail sides of the cover, thereby realizing direct air cooling for each battery cell.

[0084] According to a second aspect of this disclosure, an electrical appliance is provided, the electrical appliance including the battery pack described above.

[0085] In the battery pack of this application embodiment, since at least two air-cooling components correspond to different battery modules, at least some of the battery modules can correspond to different air-cooling components. This avoids the problem that one air-cooling component can dissipate heat from multiple battery modules, which would prevent the uniform heat dissipation of multiple battery modules from being achieved. This reduces the temperature difference between the various battery modules and ensures the heat dissipation effect. Attached Figure Description

[0086] 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 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.

[0087] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0088] Figure 1 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this disclosure; Figure 2 This is an exploded view of the battery pack provided in an exemplary embodiment of this disclosure; Figure 3 yes Figure 1 The diagram shows the structure of the air guide component. Figure 4 This is a schematic diagram of the structure of the air guide component and the battery cell working together; Figure 5 This is a cross-sectional view of the air guide component; Figure 6 yes Figure 1 The diagram shows the structure of the cover. Figure 7 yes Figure 1 The diagram shows the structure of the box from the first view. Figure 8 yes Figure 1 The diagram shows the structure of the box from the second view. Figure 9 yes Figure 1 The diagram shows a partial cross-sectional view of the box.

[0089] Explanation of reference numerals in the attached figures: 1. Battery pack; 11. Housing; 111. Receiving cavity; 112. Shell; 1121. First side wall; 1122. Second side wall; 1123. Third side wall; 1124. Extension; 1125. Connecting part; 1126. Reinforcing rib; 1127. Bottom surface; 113. Cover; 1131. First air outlet; 1132. Second air outlet; 1133. Air supply outlet; 114. Mounting port; 115. Filter component; 12. Battery module; 121. Battery cell; 122. Mounting recess; 1221. First mounting recess; 1222. Second mounting recess; 13. Air-cooled assembly; 131. Fan; 132. Air guide; 133. Main air guide; 134. Secondary air guide; 135. Air outlet; 1351. First air outlet; 1352. Second air outlet; 136. First air guide plate; 1361. First sub-air guide plate; 1362. Second sub-air guide plate; 137. Second air guide plate; 1371. Third sub-air guide plate; 1372. Fourth sub-air guide plate; 138. Guiding section; 1381. Opening; 14. Air supply interval. Detailed Implementation

[0090] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0091] In existing battery packs 1, the common thermal management systems are air cooling or liquid cooling. Liquid-cooled battery packs 1 have after-sales maintenance bottlenecks such as leakage and difficulty in replacing coolant. In contrast, air-cooled battery packs 1 in related technologies have difficulty in evenly distributing airflow to the battery module 12, resulting in low heat dissipation efficiency of the entire battery pack 1 and difficulty in achieving uniform temperature control of the battery cell 121.

[0092] This application provides a battery pack 1 and an electrical device. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the battery pack 1 provided in an embodiment of this application.

[0093] Below, we will first give an overall introduction to the technical solution of the embodiments of this application in conjunction with battery pack 1.

[0094] Battery pack 1 can be used in electrical equipment.

[0095] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0096] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0097] The vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle, etc., and this application embodiment does not limit this.

[0098] The vehicle has a battery pack 1 installed inside. For example, the battery pack 1 may be located at the bottom, front, or rear of the vehicle, but this embodiment does not limit the location.

[0099] Please refer to Figure 1 and Figure 2 This application provides a battery pack 1, which includes a housing 11, a plurality of battery modules 12 and a plurality of air-cooling components 13. The housing 11 has a receiving cavity 111; the plurality of battery modules 12 are disposed in the receiving cavity 111; and the air-cooling components 13 are disposed in the receiving cavity 111, with at least two air-cooling components 13 corresponding to different battery modules 12.

[0100] In the battery pack 1 of this application embodiment, since at least two air-cooling components 13 correspond to different battery modules 12, at least some of the battery modules 12 can correspond to different air-cooling components 13, thereby avoiding the problem that one air-cooling component 13 cannot dissipate heat for multiple battery modules 12, resulting in the inability to achieve uniform heat dissipation for multiple battery modules 12, so as to reduce the temperature difference between each battery module 12 and ensure the heat dissipation effect.

[0101] It should also be noted that in this embodiment, the number of battery modules 12 and air-cooling components 13 is the same. That is to say, one air-cooling component 13 can independently achieve heat dissipation for one battery module 12, thereby making the heat dissipation between each battery module 12 more uniform and the heat dissipation effect better.

[0102] However, this design is not limited to this. In other embodiments, two battery modules 12 may correspond to one air-cooling component 13, as long as the airflow of the air-cooling component 13 is sufficient to dissipate heat from the two battery modules 12.

[0103] In some embodiments, the battery module 12 includes a plurality of cells 121, which are spaced apart along a first direction, and the distance between at least some of the adjacent cells 121 is not equal.

[0104] Understandably, in specific implementation, the spacing between the battery cells 121 can be set according to the distance of the air outlet of the air-cooling assembly 13. The spacing between the battery cells 121 that are far from the air outlet is set to be larger, while the spacing between the battery cells 121 that are close to the air outlet is set to be smaller. Therefore, the problem of uneven cooling caused by the spacing between the battery cells 121 and the air outlet can be avoided, and the cooling effect of the battery pack 1 can be guaranteed.

[0105] In some embodiments, refer to Figure 3 and Figure 4 As shown, the air-cooled assembly 13 includes a fan 131 and an air guide 132. The fan 131 is arranged opposite to the battery module 12. The air guide 132 is connected to the fan 131. At least a portion of the air guide 132 is disposed between two adjacent cells 121 of the same battery module 12 to guide the air output by the fan 131 to the space between the two adjacent cells 121.

[0106] Thus, by setting up the fan 131, air can be output to the battery cell 121. At the same time, with the cooperation of the air guide 132, the air output by the fan 131 is guided to the space between two adjacent battery cells 121. This prevents the battery cells 121 that are far from the fan 131 from being blocked by the battery cells 121 that are close to the fan 131 due to the arrangement of the battery cells 121. This ensures that all battery cells 121 inside the battery pack 1 can be cooled, thus ensuring the cooling effect of the battery pack 1.

[0107] In some embodiments, the spacing between two adjacent cells 121 tends to gradually increase in the direction away from the fan 131.

[0108] In other words, in this embodiment, the spacing between the battery cells 121 on the side away from the fan 131 gradually increases. Since the wind force output by the fan 131 will decrease with the increase of distance, the gradually increasing spacing between the battery cells 121 on the side away from the fan 131 can avoid poor heat dissipation of the battery cells 121 due to the weakening wind force, thereby avoiding different heat dissipation effects of the battery cells 121 at different positions and ensuring uniform heat dissipation of the battery cells 121.

[0109] In some embodiments, refer to Figure 3 and Figure 4 As shown, the air guide 132 includes a main air guide 133 and a plurality of secondary air guides 134. The main air guide 133 is connected to the fan 131. Each air guide 134 is connected to the main air guide 133. Along the first direction, the plurality of secondary air guides 134 are spaced apart on the main air guide 133. A secondary air guide 134 is provided between the housing 11 and the battery cell 121 or between two adjacent battery cells 121.

[0110] Understandably, in actual use, the main air guide 133 can guide the air from the fan 131 to multiple secondary air guides 134, so that the air from the fan 131 can be smoothly guided to each battery, thereby ensuring the performance of the fan 131.

[0111] In some embodiments, at least some of the secondary air guides 134 have different thicknesses.

[0112] In this embodiment, it can be understood that some of the secondary air guides 134 are disposed between the housing 11 and the battery cell 121, so only one battery cell 121 needs to be cooled. However, some of the secondary air guides 134 are disposed between the battery cells 121, so both battery cells 121 need to be cooled. Therefore, the thickness of the secondary air guides 134 disposed between the battery cells 121 can be increased to ensure the heat dissipation efficiency of the secondary air guides 134 for the battery cells 121.

[0113] In this embodiment, the spacing between two adjacent secondary air guides 134 tends to increase.

[0114] Understandably, in specific implementation, the spacing between the secondary air guides 134 can be specifically set according to the distance from the air outlet of the air-cooled assembly 13. The spacing between the secondary air guides 134 that are far from the air outlet is set to be larger, while the spacing between the secondary air guides 134 that are close to the air outlet is set to be smaller. Therefore, the problem of uneven air volume caused by the spacing between the secondary air guides 134 and the air outlet can be avoided, thus ensuring the cooling effect of the battery pack 1.

[0115] That is to say, in some embodiments, this application also provides an air guide 132, which includes a main air guide 133 and a plurality of secondary air guides 134. The main air guide 133 is used to connect to the fan 131. The surface of the secondary air guides 134 is provided with air outlet holes 135. Each air guide 134 is connected to the main air guide 133. The plurality of secondary air guides 134 are spaced apart on the main air guide 133 along the air supply direction of the fan 131. The spacing between two adjacent secondary air guides 134 tends to increase.

[0116] In the air guide 132 of this application embodiment, the main air guide 133 can guide the air from the fan 131 to multiple secondary air guides 134, so that the air from the fan 131 can be smoothly guided to various places, thereby ensuring the performance of the fan 131; and the spacing between the secondary air guides 134 can be specifically set according to the distance of the air outlet of the fan 131. The spacing between the secondary air guides 134 far from the air outlet is set to be larger, while the spacing between the secondary air guides 134 near the air outlet is set to be smaller. Therefore, the problem of uneven air volume caused by the spacing between the secondary air guides 134 and the air outlet can be avoided, ensuring that the air volume of the air guide 132 is uniform.

[0117] In some embodiments, refer to Figure 4 As shown, an air supply gap 14 is provided between the secondary air guide 134 and at least one battery cell 121.

[0118] Thus, by setting the air supply gap 14, the air supply path can be prevented from being blocked due to the secondary air guide 134 being too close to the battery cell 121, ensuring that the air output by the fan 131 is smoothly transmitted to the battery cell 121, thereby ensuring the heat dissipation effect.

[0119] In some embodiments, the secondary air guide 134 is provided with a first air supply cavity, and the surface of the secondary air guide 134 is provided with a plurality of air supply holes 135, the air supply holes 135 are opposite to the battery cell 121, and the air supply holes 135 are connected to the first air supply cavity.

[0120] Thus, by setting multiple air outlets 135, and with the air outlets 135 facing the battery cell 121, the air from the fan 131 can smoothly pass through the first air outlet cavity and be output from the air outlets 135 to the surface of the battery cell 121, thereby achieving rapid heat dissipation of the battery cell 121.

[0121] In some embodiments, the secondary air guide 134 includes a first air guide plate 136 and a second air guide plate 137. The first air guide plate 136 is disposed between the housing 11 and the battery cell 121, and an air supply hole 135 is provided on the side of the first air guide plate 136 facing the battery cell 121 along the first direction. The second air guide plate 137 is disposed between two adjacent battery cells 121, and an air supply hole 135 is provided on the side of the second air guide plate 137 facing the battery cell 121 along the first direction.

[0122] It is understood that in this embodiment, the first air guide plate 136 is disposed between the housing 11 and the battery cell 121. Therefore, it is only necessary to provide an air outlet 135 on the side facing the battery cell 121 to avoid the reduction of air volume due to the provision of extra air outlets 135, thus ensuring the heat dissipation effect on the battery cell 121.

[0123] In addition, the second air guide plate 137 is set between the battery cells 121. Therefore, the second air guide plate 137 needs to be provided with air supply holes 135 on both sides to ensure that the second air guide plate 137 can deliver air volume to the two adjacent battery cells 121, so that the battery cells 121 on both sides can achieve the cooling effect.

[0124] Furthermore, in this embodiment, the thickness of the second air guide plate 137 is greater than the thickness of the first air guide plate 136.

[0125] In this way, a larger cavity can be opened in the second air guide plate 137, so that more gas flows out from the second air guide plate 137 to better dissipate heat from the battery cells 121 on both sides, while the first air guide plate 136 can be opened with a smaller cavity, which is sufficient to dissipate heat from the battery cell 121 on one side, so that the battery cells 121 in all positions can achieve uniform heat dissipation.

[0126] In some embodiments, refer to Figure 5 As shown, the air supply hole 135 includes a first air supply hole 1351 and a second air supply hole 1352. The first air supply hole 1351 is located on the side of the second air supply hole 1352 away from the main air supply component 133. The air supply area of ​​the second air supply hole 1352 is smaller than the air supply area of ​​the first air supply hole 1351.

[0127] Thus, in this embodiment, the air from the fan 131 is delivered to the secondary air guide 134 via the main air guide 133. Therefore, by setting the air delivery area of ​​the first air outlet 1351, which is farther from the main air guide 133, to be larger than the area of ​​the second air outlet 1352, which is closer to the main air guide 133, it is possible to avoid differences in the air delivery volume of different areas of the same secondary air guide 134 due to distance, thereby ensuring uniform heat dissipation of the battery cell 121.

[0128] In some embodiments, the ratio of the air supply area of ​​the second air supply hole 1352 to the air supply area of ​​the first air supply hole 1351 is greater than or equal to 0.93 and less than or equal to 0.97.

[0129] In this way, by setting the above parameters, the impact of distance on air volume can be reduced, while avoiding the impact of excessive air volume due to large differences in air supply area. This ensures that the air volume in different areas of the same air guide 134 is uniform, thus guaranteeing the cooling effect.

[0130] In this embodiment, the opening width of the first air supply hole 1351 is 10.4 mm, and the opening width of the second air supply hole 1352 is 10 mm.

[0131] In some embodiments, multiple first air supply holes 1351 and second air supply holes 1352 are provided, and the distance between two adjacent first air supply holes 1351 is greater than the distance between two adjacent second air supply holes 1352.

[0132] Thus, the air from the fan 131 is delivered to the secondary air guide 134 through the main air guide 133. Therefore, setting the spacing of the first air outlet 1351, which is farther away from the main air guide 133, to be greater than the spacing of the second air outlet 1352, which is closer to the main air guide 133, can avoid reducing the possibility of airflow interference from the first air outlet 1351, thereby ensuring uniform heat dissipation of the battery cell 121.

[0133] In some embodiments, the first air guide plate 136 includes a first sub-air guide plate 1361 and a second sub-air guide plate 1362. The first sub-air guide plate 1361 is located on the side of the main air guide member 133 near the fan 131, and the air delivery area of ​​the first sub-air guide plate 1361 is smaller than the air delivery area of ​​the second sub-air guide plate 1362; and / or, The second air guide plate 137 includes a third sub-air guide plate 1371 and a fourth sub-air guide plate 1372. The third sub-air guide plate 1371 is located on the side of the main air guide component 133 near the fan 131. The air delivery area of ​​the third sub-air guide plate 1371 is smaller than the air delivery area of ​​the fourth sub-air guide plate 1372.

[0134] In other words, in this embodiment, the air delivery area of ​​the secondary air guide 134 on the side away from the fan 131 is larger, thereby avoiding interference with the air delivery volume due to distance.

[0135] In this embodiment, due to the wind drop, the wind speed is reduced by 5% for every 100mm along the airflow direction. To ensure the same air volume, the cross-sectional area of ​​each secondary air guide 134 should be increased. Taking the air supply area required for the large surface of the first battery cell 121 as A0 (i.e., the first air guide plate 136 with a single-sided opening), the first second air guide plate 137 has double-sided openings, and the air supply area A1 = 2*A0 / (1-5%); the air supply area of ​​the second second air guide plate 137 is A3 = 2*A0 / (1-5%×2), and so on.

[0136] In some embodiments, refer to Figure 3 As shown, the air-cooled assembly 13 also includes a guide section 138, which is disposed between the fan 131 and the air guide 132. The guide section 138 is used to guide the air output by the fan 131 to the air guide 132.

[0137] Thus, through the setting of the guide section 138, most of the air volume of the fan 131 can be smoothly delivered to the air guide component 132, thereby better ensuring the cooling effect of the battery cell 121.

[0138] In some embodiments, the guide portion 138 is provided with a second air supply cavity and an opening 1381 communicating with the second air supply cavity, the air outlet of the fan 131 faces the opening 1381, the main air supply component 133 is provided with a third air supply cavity, and the second air supply cavity is communicating with the first air supply cavity through the third air supply cavity.

[0139] Thus, in actual use, the air output by the fan 131 can be delivered from the opening 1381 to the second air supply chamber, then from the third air supply chamber to the first air supply chamber, and finally output from the air supply hole 135 to the surface of the battery cell 121. Therefore, the air output by the fan 131 can be prevented from spreading to other positions, ensuring heat dissipation efficiency.

[0140] In some embodiments, refer to Figure 1 and Figure 2 As shown, the housing 11 includes a shell 112 and a cover 113. The shell 112 includes a receiving cavity 111. The cover 113 covers the shell 112, thereby forming a closed cavity in the housing 11 to protect the battery cell 121.

[0141] It should also be noted that, in this embodiment, the bottom surface 1127 of the housing 112 has a pre-drilled mounting hole for the battery pack 1.

[0142] In some embodiments, the housing 112 includes a connecting portion 1125, which is connected to the side of the housing 112 near the cover 113 for connection with the cover 113.

[0143] In this way, the connecting part 1125 can better ensure the connection between the housing 112 and the cover 113, and avoid the phenomenon of unstable connection due to the small thickness of the housing 112.

[0144] In some embodiments, refer to Figure 6 As shown, the cover 113 includes a top surface away from the housing 112, and a plurality of first air outlets 1131 are provided on the top surface.

[0145] In this way, after the air output by the fan 131 successfully cools the battery cell 121, it can be output from the first air outlet 1131 on the top surface, thereby avoiding the continuous accumulation of heat inside the housing 11 and affecting the heat dissipation effect of the battery cell 121.

[0146] Furthermore, by placing the first air outlet 1131 on the top surface, the air output by the fan 131 can pass completely over the surface of the battery cell 121 before being output from the cover 113, thus ensuring the heat dissipation effect of the battery cell 121.

[0147] It should also be noted that multiple first air outlets 1131 are spaced apart along the arrangement direction of the battery module 12, and each first air outlet 1131 extends along the arrangement direction of multiple cells 121 within the same battery module 12.

[0148] In this way, the air flowing through the battery cell 121 can be exhausted from the first air outlet 1131, ensuring the heat dissipation effect.

[0149] In some embodiments, refer to Figure 6 As shown, the peripheral surface of the cover 113 includes a first side and other sides, the fan 131 of the air-cooled assembly 13 is disposed near the first side, and at least one of the other sides is provided with a second air outlet 1132.

[0150] Therefore, in this embodiment, a second air outlet 1132 is not provided on the first side near the fan 131, which can avoid the disorder of air intake and exhaust and affect the heat exchange efficiency.

[0151] It is understood that in this embodiment, the cover 113 is provided with an air outlet 1133 communicating with the accommodating cavity 111 on the side facing the housing 112, and the air outlet 1133 is respectively connected to the first air outlet 1131 and the second air outlet 1132.

[0152] Thus, the air outlet 1133 is designed to deliver the gas inside the heat-dissipated housing 11 to the first air outlet 1131 and the second air outlet 1132 for outflow, ensuring the heat dissipation effect of the battery cell 121.

[0153] In some embodiments, refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the housing 112 includes multiple mounting ports 114 and multiple filter components 115. The mounting ports 114 are connected to the air-cooling assembly 13. The filter components 115 are connected to the mounting ports 114 and have multiple air inlets that are connected to the air-cooling assembly 13.

[0154] In this way, by setting up the filter component 115, larger foreign objects can be filtered out, avoiding any impact on the normal use of the fan 131.

[0155] In this embodiment, the filter component 115 is a filter screen plate with multiple filter holes.

[0156] It should also be noted that, in the specific implementation process, the number of fans 131 is consistent with the number of mounting ports 114 and the number of filter components 115, so as to ensure the effect of use.

[0157] In some embodiments, the housing 112 includes a bottom surface 1127 away from the cover 113, the bottom surface 1127 having a plurality of mounting recesses 122 protruding toward the side opposite to the cover 113, and at least part of the mounting recesses 122 being used to accommodate the battery cell 121.

[0158] That is to say, in some embodiments, the present application provides a housing 11 for a battery pack, which includes a cover 113 and a shell 112. The shell 112 is connected to the cover 113. The shell 112 includes a receiving cavity 111. The shell 112 includes a bottom surface 1127 away from the cover 113. The bottom surface 1127 is provided with a plurality of mounting recesses 122. The mounting recesses 122 protrude toward the side away from the cover 113. The mounting recesses 122 are used to accommodate battery cells 121.

[0159] In the housing of this application embodiment, the installation recess 122 facilitates the positioning and installation of the battery cell 121 and prevents the battery cell 121 from shifting during use, thus ensuring safety. Furthermore, since the installation recess 122 protrudes towards the side opposite to the cover 113, an installation position can be formed without increasing the thickness of the bottom surface 1127 of the housing 112, meeting the lightweight requirements of the battery pack 1.

[0160] In some embodiments, the battery module 12 includes a plurality of battery cells 121, as shown in the reference. Figure 7 and Figure 8 As shown, the housing 112 includes a plurality of first mounting recesses 1221 and a plurality of second mounting recesses 1222. The first mounting recesses 1221 protrude toward the side opposite to the cover 113 and are used to accommodate the battery cell 121. The second mounting recesses 1222 protrude toward the side opposite to the cover 113 and are used to accommodate the air-cooling assembly 13.

[0161] Thus, the first mounting recess 1221 and the second mounting recess 1222 facilitate the positioning and installation of the battery cell 121 and the air guide 132, and prevent the battery cell 121 and the air guide 132 from shifting during use, thus ensuring safe use.

[0162] Furthermore, since the first mounting recess 1221 and the second mounting recess 1222 protrude toward the side away from the cover 113, the mounting position can be formed without increasing the thickness of the bottom surface 1127 of the housing 112, thus meeting the lightweight requirements of the battery pack 1.

[0163] In addition, the battery cell 121 and the first mounting recess 1221, the air guide plate and the second mounting recess 1222 are clearance fit (in this case, a 1mm gap is used as an example). The spacing between two adjacent first mounting recesses 1221 is based on the arrangement pattern of the battery cells 121 to make corresponding holes. The gap is filled with structural adhesive to fix the battery cell 121 and the first mounting recess 1221.

[0164] In this embodiment, the spacing between two cells 121 in the lateral direction between different battery modules 12 is the same (38mm in this case). The spacing between two adjacent cells 121 in the same module is not the same. The specific spacing is = width of the inner section of the second air guide plate 137 + sheet metal thickness of the second air guide plate 137 (1mm in this case) * 2 + air supply gap 14 (9mm in this case) * 2.

[0165] In some embodiments, the depth of the first mounting recess 1221 is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, the depth of the second mounting recess 1222 is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, the distance between the first mounting recess 1221 and the second mounting recess 1222 is greater than or equal to 2 mm and less than or equal to 5 mm.

[0166] Thus, by setting the above parameters, it is possible to ensure that the size is sufficient to install the battery cell 121 or the air guide 132, while avoiding the excessively large protrusion of the installation recess 122, thereby better reducing the impact on the volume of the housing 11.

[0167] Furthermore, this avoids interference caused by an excessively small gap between the battery cell 121 and the air guide 132, and also prevents the cooling effect from being affected by an excessively large gap between the battery cell 121 and the air guide 132.

[0168] In some embodiments, the housing 112 includes a bottom surface 1127, a first sidewall 1121, and a second sidewall 1122, wherein the bottom surface 1127 is located away from the cover 113; the first sidewall 1121 is connected between the bottom surface 1127 and the cover 113; the second sidewall 1122 is disposed opposite to the first sidewall 1121 and is connected between the bottom surface 1127 and the cover 113; wherein both the first sidewall 1121 and the second sidewall 1122 are provided with two extensions 1124 to form a clamping space between the two extensions 1124.

[0169] Thus, the extension 1124 allows for better coordination with external equipment, facilitating the lifting or other operations of the battery pack 1.

[0170] In some embodiments, refer to Figure 9 As shown, the housing 112 also includes a third sidewall 1123 and a reinforcing rib 1126. The third sidewall 1123 is connected between the bottom surface 1127 and the connecting portion 1125, and the reinforcing rib 1126 is connected between the connecting portion 1125 and the third sidewall 1123.

[0171] This increases the overall strength of the connecting part 1125, thereby improving the overall strength of the housing 11, and also facilitates the connection between the connecting part 1125 and the housing 112.

[0172] In this embodiment, the fan 131 is configured as an axial flow fan. In summary, the air enters from the filter component 115, flows through the fan by the axial suction of the axial flow fan, flows through the guide part 138 and the main airflow component 133, then flows through the secondary airflow component 134, and is blown vertically towards the large surface of the battery cell 121 through the air outlet 135 on the secondary airflow component 134 between the battery cells 121, and then upwards through the first air outlet 1131, and after passing through the space of the top cover 113, it is discharged to the second air outlet 1132 on the left, right and tail sides of the cover 113, thereby achieving direct air cooling for each battery cell 121.

[0173] According to a second aspect of this disclosure, an electrical appliance is provided, which includes the battery pack 1 described above. This electrical appliance possesses all the beneficial effects of the battery pack 1, which will not be elaborated further herein.

[0174] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0175] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0176] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0177] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, characterized in that, include: Box (11), wherein the box (11) is provided with a receiving cavity (111); Multiple battery modules (12) are disposed within the accommodating cavity (111); and, Multiple air-cooled components (13) are disposed in the accommodating cavity (111), and at least two air-cooled components (13) are disposed corresponding to different battery modules (12).

2. The battery pack according to claim 1, characterized in that, The battery module (12) includes a plurality of cells (121) arranged at intervals along a first direction, and the distance between at least some of the adjacent cells (121) is not equal.

3. The battery pack according to claim 2, characterized in that, The air-cooled component (13) includes: A fan (131) is arranged opposite to the battery module (12); and, A wind guide (132) is connected to the fan (131). At least a portion of the wind guide (132) is disposed between two adjacent cells (121) of the same battery module (12) to guide the air output by the fan (131) to the space between the two adjacent cells (121).

4. The battery pack according to claim 3, characterized in that, Along the direction away from the fan (131), the spacing between two adjacent cells (121) tends to gradually increase.

5. The battery pack according to claim 3, characterized in that, The air guide (132) includes: A main airflow component (133) is connected to the fan (131); and, Multiple secondary air guides (134) are provided, each of which is connected to the primary air guide (133); along the first direction, the multiple secondary air guides (134) are spaced apart on the primary air guide (133); a secondary air guide (134) is provided between the housing (11) and the battery cell (121) or between two adjacent battery cells (121).

6. The battery pack according to claim 5, characterized in that, At least some of the secondary air guides (134) have different thicknesses.

7. The battery pack according to claim 5, characterized in that, An air supply gap (14) is provided between the secondary air guide (134) and at least one of the battery cells (121).

8. The battery pack according to any one of claims 5-7, characterized in that, The secondary air guide (134) is provided with a first air supply cavity. The surface of the secondary air guide (134) is provided with a plurality of air supply holes (135). The air supply holes (135) are opposite to the battery cell (121) and the air supply holes (135) are connected to the first air supply cavity.

9. The battery pack according to claim 8, characterized in that, The secondary air guide (134) includes: A first air guide plate (136) is disposed between the housing (11) and the battery cell (121). Along the first direction, the air guide plate (136) has an air outlet (135) on its side facing the battery cell (121); and... The second air guide plate (137) is disposed between two adjacent battery cells (121). Along the first direction, the air guide plate (137) has air supply holes (135) on its side facing the battery cell (121).

10. The battery pack according to claim 9, characterized in that, The air supply hole (135) includes a first air supply hole (1351) and a second air supply hole (1352). The first air supply hole (1351) is located on the side of the second air supply hole (1352) away from the main air supply component (133). The air supply area of ​​the second air supply hole (1352) is smaller than the air supply area of ​​the first air supply hole (1351).

11. The battery pack according to claim 10, characterized in that, The ratio of the air supply area of ​​the second air supply hole (1352) to the air supply area of ​​the first air supply hole (1351) is greater than or equal to 0.93 and less than or equal to 0.

97.

12. The battery pack according to any one of claims 10 or 11, characterized in that, Both the first air supply hole (1351) and the second air supply hole (1352) are provided with multiple holes, and the distance between two adjacent first air supply holes (1351) is greater than the distance between two adjacent second air supply holes (1352).

13. The battery pack according to any one of claims 9-12, characterized in that, The first air guide plate (136) includes a first sub-air guide plate (1361) and a second sub-air guide plate (1362). The first sub-air guide plate (1361) is located on the side of the main air guide component (133) closer to the fan (131). The air delivery area of ​​the first sub-air guide plate (1361) is smaller than the air delivery area of ​​the second sub-air guide plate (1362); and / or, The second air guide plate (137) includes a third sub-air guide plate (1371) and a fourth sub-air guide plate (1372). The third sub-air guide plate (1371) is located on the side of the main air guide component (133) close to the fan (131). The air delivery area of ​​the third sub-air guide plate (1371) is smaller than that of the fourth sub-air guide plate (1372).

14. The battery pack according to any one of claims 8-13, characterized in that, The air-cooled assembly (13) further includes a guide section (138), which is disposed between the fan (131) and the air guide (132). The guide section (138) is used to guide the air output by the fan (131) to the air guide (132).

15. The battery pack according to claim 14, characterized in that, The guide part (138) is provided with a second air supply cavity and an opening (1381) communicating with the second air supply cavity. The air outlet of the fan (131) faces the opening (1381). The main air supply component (133) is provided with a third air supply cavity. The second air supply cavity is connected to the first air supply cavity through the third air supply cavity.

16. The battery pack according to any one of claims 1-15, characterized in that, The housing (11) includes: Housing (112), the housing (112) including the receiving cavity (111); and, A cover (113) is provided on the housing (112).

17. The battery pack according to claim 16, characterized in that, The cover (113) includes a top surface away from the housing (112), and the top surface is provided with a plurality of first air outlets (1131).

18. The battery pack according to claim 17, characterized in that, The peripheral surface of the cover (113) includes a first side and other sides, the fan (131) of the air-cooling assembly (13) is disposed near the first side, and at least one of the other sides is provided with a second air outlet (1132).

19. The battery pack according to any one of claims 16-18, characterized in that, The housing (112) includes: Multiple mounting ports (114) are connected to the air-cooled assembly (13); and, Multiple filter components (115) are connected to the mounting port (114). The filter components (115) are provided with multiple air inlets, which are connected to the air-cooling assembly (13).

20. The battery pack according to any one of claims 16-19, characterized in that, The battery module (12) includes multiple battery cells (121), and the housing (112) includes: A plurality of first mounting recesses (1221) protrude toward a side opposite to the cover (113), the first mounting recesses (1221) being used to receive the battery cell (121); and, Multiple second mounting recesses (1222) protrude toward the side opposite to the cover (113) and are used to accommodate the air-cooling assembly (13).

21. The battery pack according to claim 20, characterized in that, The depth of the first mounting recess (1221) is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, The depth of the second mounting recess (1222) is greater than or equal to 5 mm and less than or equal to 10 mm; and / or, The distance between the first mounting recess (1221) and the second mounting recess (1222) is greater than or equal to 2 mm and less than or equal to 5 mm.

22. The battery pack according to any one of claims 15-21, characterized in that, The housing (112) includes: Bottom surface (1127), said bottom surface (1127) is away from the cover (113); A first sidewall (1121) is connected between the bottom surface (1127) and the cover (113); The second sidewall (1122) is disposed opposite to the first sidewall (1121) and is connected between the bottom surface (1127) and the cover (113). The first sidewall (1121) and the second sidewall (1122) are each provided with two extensions (1124) to form a clamping space between the two extensions (1124).

23. An electrical appliance, characterized in that, Includes the battery pack (1) as described in any one of claims 1-22.

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