Battery pack, electric equipment and vehicle

Abstract

The utility model provides a battery pack, electric equipment and a vehicle. The battery pack comprises a support and battery cells, the battery cells are arranged on at least one side of the support, and turbulent flow concave points are concavely arranged on at least one of the outer surfaces of the battery cells and the side faces, facing the battery cells, of the support. In the application, the turbulent flow concave points are concavely arranged on the outer surface of the battery cell, or the turbulent flow concave points are concavely arranged on the side surface, facing the battery cell, of the bracket, or the turbulent flow concave points are concavely arranged on the outer surface of the battery cell and the side surface, facing the battery cell, of the bracket at the same time, so that the flowing direction of cooling air is changed, and a boundary layer on the surface is thinned; therefore, the convective heat transfer coefficient of the surface of the battery cell is enhanced, cooling air can take away more heat on the surface, and the cooling and heat dissipation effects are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, an electrical device and a vehicle. Background Art

[0002] With the development of the new energy industry, batteries are gradually used in various fields. Among them, the temperature of battery cells is an important factor in ensuring service life, performance and safety. In the current battery air cooling system, multiple stacked cells are usually cooled as a whole. However, as the number of series-connected cells increases, the overall heat dissipation cannot meet the demand. Utility Model Content

[0003] The present application provides a battery pack, electrical equipment and vehicle that are beneficial to improving the cooling effect.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, comprising a bracket and a battery cell, wherein the battery cell is provided on at least one side of the bracket, and a spoiler depression is provided on at least one of an outer surface of the battery cell and a side surface of the bracket facing the battery cell.

[0005] According to the first aspect, in a possible implementation manner, the battery cells are disposed on opposite sides of the bracket, and there is a gap between at least one of the battery cells and the bracket.

[0006] According to the first aspect, in a possible implementation, among the two battery cells located on both sides of the bracket, there is a gap between one battery cell and the bracket, and the other battery cell is in contact with the bracket; the spoiler groove on the bracket passes through the bracket, and the spoiler groove is gradually tapered in the direction away from the gap side.

[0007] According to the first aspect, in a possible implementation, at least two battery cells are provided on one side of the bracket along a first direction, and the first direction intersects with the arrangement direction of the bracket and the battery cells; a cavity is formed at one end of the bracket, and the cavity is used to fill a heat exchange medium.

[0008] According to the first aspect, in a possible implementation manner, the bracket includes a partition and a mounting frame provided on at least one side of the partition, and the battery cell is provided on the mounting frame.

[0009] According to the first aspect, in a possible implementation, the battery pack includes a battery box having a cavity, the battery box is provided with an air inlet and an air outlet connected to the cavity, the bracket and the battery cell are both arranged in the cavity and located between the air inlet and the air outlet.

[0010] According to the first aspect, in a possible implementation, an inner wall of the battery box is provided with a spoiler block protruding toward the bracket, and the spoiler block is used to change the flow direction of the heat exchange medium when the heat exchange medium flows in the battery box.

[0011] According to the first aspect, in a possible implementation, a plurality of the brackets arranged along a second direction are provided in the cavity, and the second direction is the arrangement direction of the brackets and the battery cells; among two adjacent brackets, the battery cells on one bracket are spaced apart from the other bracket or the battery cells on the other bracket.

[0012] According to the first aspect, in a possible implementation, an air inlet duct and an air outlet duct are respectively formed between the multiple brackets and the side walls of the battery box on both sides along the first direction; the air inlet is connected to the air inlet duct, and the air outlet is connected to the air outlet duct; a branch air duct is formed between the battery cell and the adjacent bracket or between the battery cell and the adjacent battery cell, and the branch air duct connects the air inlet duct and the air outlet duct.

[0013] According to the first aspect, in a possible implementation, among the multiple brackets, two brackets located at both ends are respectively a first bracket and a second bracket; the air inlet is arranged close to the first bracket, and the air outlet is arranged close to the second bracket.

[0014] According to the first aspect, in a possible implementation manner, the air inlet is located at a projection of the air inlet duct on the battery box along the second direction.

[0015] According to the first aspect, in a possible implementation, an air nozzle is provided at the air inlet, a first end of the air nozzle is provided outside the battery box, a second end of the air nozzle is provided inside the battery box, and a duct area of ​​the first end of the air nozzle is larger than a duct area of ​​the second end.

[0016] According to the first aspect, in a possible implementation manner, a projection of the second end of the air nozzle along the first direction is located on the bracket at the end.

[0017] In a second aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device comprises the battery pack according to the first aspect.

[0018] In a third aspect, an embodiment of the present application further provides a vehicle, the vehicle further comprising a battery pack according to the first aspect.

[0019] The present application provides a battery pack, an electric device and a vehicle. By setting a spoiler concave point on the outer surface of the battery cell, turbulence is formed when the cooling wind passes through the spoiler concave point on the battery cell. As a result, the wind direction on the surface of the battery cell changes continuously, and the boundary layer on the surface of the battery cell is thinned, thereby enhancing the convective heat transfer coefficient on the surface of the battery cell, and the cooling wind can take away more heat from the surface of the battery cell, thereby improving the cooling and heat dissipation effect. The spoiler concave point can also be set on the bracket, and the cooling wind can pass through the gap between the bracket and the battery cell. The spoiler concave point can have the same effect on the cooling wind passing through the gap between the bracket and the battery cell, thereby improving the cooling and heat dissipation effect; the bracket can also contact the battery cell for heat exchange, and the bracket itself can quickly dissipate heat, thereby increasing the temperature difference between the partition and the battery cell, and improving the cooling and heat dissipation effect of the battery cell. Therefore, the spoiler concave point can be set on the outer surface of the battery cell, or the spoiler concave point can be set on the side of the bracket facing the battery cell, or the spoiler concave point can be set on the outer surface of the battery cell and the side of the partition facing the battery cell at the same time to change the direction of the cooling wind when it flows through, enhance the convective heat transfer coefficient, and improve the cooling and heat dissipation effect of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a schematic diagram of the structure of a battery pack in one embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the internal structure of a battery pack in one embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a battery cell and its CC cross-section in one embodiment of the present application;

[0024] Figure 4 is a schematic diagram of the connection between the bracket and the battery cell in one embodiment of the present application;

[0025] Figure 5 yes Figure 4 Schematic diagram of the middle bracket and the side of the battery cell;

[0026] Figure 6 is a schematic diagram of a bracket in an embodiment of the present application;

[0027] Figure 7 yes Figure 6 Schematic diagram of the middle DD section;

[0028] Figure 8 yes Figure 6Schematic diagram of the EE section;

[0029] Fig. 9 It is a schematic diagram of the internal structure of a battery pack and its FF cross-section in one embodiment of the present application.

[0030] Reference numerals:

[0031] 100-battery pack; 10-battery box; 11-chamber; 12-air inlet; 13-air outlet; 14-air inlet duct; 15-air outlet duct; 161-horizontal plate; 162-vertical plate; 20-bracket; 21-partition plate; 22-mounting frame; 23-cavity; 20a-first bracket; 20b-second bracket; 30-battery cell; 30a-first battery cell; 30b-second battery cell; 41-spoiler concave point; 42-branch air duct; 43-nozzle; 45-spoiler block. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] The present application provides an electrical device, which includes a battery pack, and the battery pack is used to supply power to the electrical device.

[0037] It can be understood that in some embodiments, the electrical device can be a vehicle, the vehicle includes a battery pack, and the battery can be used as a power battery to provide a power source for the vehicle.

[0038] In some other embodiments, the electrical device may also be an energy storage device, an electric tool, a drone, etc.

[0039] See also Figure 1 and Figure 2 The battery pack 100 includes a battery box 10, a bracket 20 and a battery cell 30. The battery box 10 has a cavity 11, and an air inlet 12 and an air outlet 13 connected to the cavity 11 are opened on the battery box 10; the bracket 20 is arranged in the cavity 11, and the battery cell 30 can be installed on one side or opposite sides of the bracket. The battery cell 30 in the battery pack 100 can be cooled by air. Cooling wind from the air inlet 12 to the air outlet 13 is formed in the cavity 11. The bracket 20 and the battery cell 30 are located between the air inlet 12 and the air outlet 13. The cooling wind exchanges heat with the battery cell 30 when flowing through, thereby cooling and dissipating the heat of the battery cell 30.

[0040] The outer surface of the battery cell 30 may be provided with a spoiler concave point 41, such as Figure 3 As shown, when the cooling wind passes through the spoiler concave point 41 on the battery cell 30, turbulence is formed, thereby the wind direction on the surface of the battery cell 30 is constantly changing, and the boundary layer on the surface of the battery cell 30 is thinned, thereby enhancing the convective heat transfer coefficient between the cooling wind and the surface of the battery cell 30. The cooling wind can take away more heat from the surface of the battery cell 30, thereby improving the cooling and heat dissipation effect. The spoiler concave point 41 can also be concavely provided on the side of the bracket 20 facing the battery cell, such as Figure 4 As shown, the cooling air can pass through the gap between the bracket 20 and the battery cell 30, and the spoiler concave point 41 can have the same effect on the cooling air passing through the gap between the bracket 20 and the battery cell 30, thereby improving the cooling and heat dissipation effect; the bracket 20 can also contact with the battery cell 30 for heat exchange, and the bracket 20 itself can quickly dissipate heat, thereby increasing the temperature difference between the partition 21 and the battery cell 30, and improving the cooling and heat dissipation effect of the battery cell 30. Therefore, the spoiler concave point 41 can be recessed on the outer surface of the battery cell 30, or the spoiler concave point 41 can be recessed on the bracket 20, or the spoiler concave point 41 can be recessed on the outer surface of the battery cell 30 and the bracket 20 at the same time to change the direction of the cooling air when it flows through, enhance the convection heat transfer coefficient, and improve the cooling and heat dissipation effect of the battery cell 30.

[0041] The spoiler dimples 41 on the outer surface of the battery cell 30 may be pits with high edges and a low middle, and their cross-sectional shapes may be circular, polygonal, other regular shapes or irregular shapes. Multiple spoiler dimples 41 may be evenly distributed or scattered on the outer surface of the battery cell 30 .

[0042] The spoiler concave points 41 on the bracket 20 can be pits with high edges and low middles, or can be through holes that penetrate the bracket 20. Their cross-sectional shapes can be circular, polygonal, other regular or irregular shapes. Multiple spoiler concave points 41 can be evenly distributed or scattered on the bracket 20.

[0043] The bracket 20 includes a partition 21 and a mounting frame 22. The mounting frame 22 is arranged on at least one side of the partition 21. The battery cell 30 is fixed on the mounting frame 22. The mounting frame 22 can define a mounting position. The battery cells 30 are arranged in the mounting position one by one, thereby completing the installation and fixation of the battery cells.

[0044] In the first example of this embodiment, a mounting frame 22 is provided on one side of the partition 21. When the battery cell 30 is fixed to the mounting frame 22, there may be a gap between the battery cell 30 and the partition 21, so that cooling air may flow through the gap between the battery cell 30 and the partition 21, thereby directly exchanging heat on both sides of the battery cell 30, thereby improving the heat exchange effect. The battery cell 30 may also be attached to the partition 21, and the partition 21 may be in contact with the battery cell 30 for heat exchange.

[0045] In the second example of this embodiment, mounting frames 22 are provided on both sides of the partition 21, that is, battery cells 30 are provided on both sides of the partition 21, and there can be gaps between the battery cells 30 on both sides and the partition 21, so that cooling air flows through both sides of each battery cell 30 for direct heat exchange. The battery cells 30 on one side can also be spaced apart from the partition 21, and the battery cells 30 on the other side are attached to the partition 21. The battery cells 30 on both sides are defined as the first battery cell 30a, and the battery cells 30 attached to the partition 21 are defined as the second battery cell 30b; so that cooling air flows through both sides of the first battery cell 30a for direct heat exchange, and cooling air flows through one side of the second battery cell 30b for direct heat exchange, and the other side is in contact with the bracket 20 for heat exchange, so that more brackets 20 and battery cells 30 can be arranged in a limited space.

[0046] See also Figures 5 to 7 When the battery cell 30 on one side is spaced from the partition 21 and the battery cell 30 on the other side is attached to the partition 21, the spoiler concave point 41 on the partition 21 can be in the form of a through hole, and the spoiler concave point 41 is gradually set in the direction away from the gap side. The spoiler concave point 41 is gradually set in the direction from the first battery cell 30a to the second battery cell 30b, and the small end of the spoiler concave point 41 is blocked by the second battery cell 30b, forming a structure similar to a pit. The cooling air flows in the gap between the first battery cell 30a and the partition 21. The spoiler dimples 41 distributed on the partition 21 can, on the one hand, form a spoiler effect, so that the wind direction of the cooling air flowing through it changes continuously, thinning the boundary layer on the surface, and the cooling air changes from laminar flow to turbulent flow, thereby enhancing the surface convection heat transfer coefficient between the cooling air and the first battery cell 30a; on the other hand, the surface of the second battery cell 30b can be directly cooled by the spoiler dimples 41 to increase the heat exchange area. Both the first battery cell 30a and the second battery cell 30b can achieve double-sided cooling, so that the cooling air can take away more heat and improve the cooling and heat dissipation efficiency.

[0047] Typically, see Figure 2 and Fig. 9, a battery pack 100 includes a plurality of battery cells 30. Matching this, the number of the brackets 20 is multiple, and the multiple brackets 20 are arranged and stacked along the second direction X in the battery box 10. Based on the technical solution of the first example above, in two adjacent brackets 20, the battery cell 30 on one bracket 20 is spaced apart from the other bracket 20; based on the technical solution of the second example above, the first battery cell 30a on one bracket 20 is spaced apart from the second battery cell 30b on the other bracket 20. This ensures that cooling air passes through both sides of each battery cell 30 along the second direction X, thereby ensuring the cooling and heat dissipation efficiency of the battery cell 30.

[0048] Specifically, in this embodiment, the second direction X is preferably the arrangement direction of the bracket 20 and the battery cell 30, and thus, it can be understood that a plurality of brackets 20 are arranged along the second direction X, and the two sides of the bracket 20 along the second direction X are used to install the battery cell 30, and one battery cell 30 or two battery cells 30 can be arranged between two adjacent brackets 20. It can be understood that due to the existence of processing errors and installation errors, the second direction X in this application may also have a certain angle with the arrangement direction of the bracket 20 and the battery cell 30.

[0049] When multiple brackets 20 are arranged in the battery box 10 along the second direction X, an air inlet duct 14 and an air outlet duct 15 are formed between the two sides of the bracket 20 along the first direction Y and the side wall of the battery box 10, and the first direction Y and the second direction X intersect; the air inlet 12 is connected to the air inlet duct 14, the air outlet 13 is connected to the air outlet duct 15, and the gaps between the battery cells 30 and the battery cells 30 or the gaps between the battery cells 30 and the bracket 20 form a branch air duct 42, and the branch air duct 42 connects the air inlet duct 14 and the air outlet duct 15. The air inlet 12, the air inlet duct 14, the multiple branch air ducts 42, the air outlet duct 15, and the air outlet 13 are sequentially connected to form a connecting passage, which can allow cooling wind to enter and circulate, and take away the heat on the surface of the battery cell 30, thereby realizing cooling and heat dissipation of the battery cell 30 and reducing the temperature difference between different battery cells 30.

[0050] Specifically, for the intersection of the first direction Y and the second direction X, the present embodiment preferably has the first direction Y perpendicular to the second direction X. It is understandable that in some other embodiments, the first direction Y and the second direction X may not be perpendicular, as long as there is an angle between the first direction Y and the second direction X, and the present application does not limit this.

[0051] A plurality of brackets 20 are arranged and stacked along a second direction X, and the two brackets 20 located at the ends are defined as a first bracket 20a and a second bracket 20b, respectively. The air inlet 12 is arranged close to the first bracket 20a, and the air outlet 13 is arranged close to the second bracket 20b. The cooling air in the air inlet duct 14 is distributed to the branch ducts 42 one by one along the second direction X, so as to ensure that there is cooling air in all the branch ducts 42 between the first bracket 20a and the second bracket 20b.

[0052] The cross section of the battery box 10 can be a regular or irregular shape such as a square or a circle. The following description takes the cross section of the battery box 10 as an example. The battery box 10 includes two vertical plates 162 arranged oppositely along the second direction X and two horizontal plates 161 arranged oppositely along the first direction Y. An air inlet duct 14 and an air outlet duct 15 are formed between the two horizontal plates 161 and the bracket 20. The first direction Y is perpendicular to the second direction X. It can be understood that the connection between the horizontal plate 161 and the vertical plate 162 forms a vertex angle. The battery box 10 has four vertex angles. The air inlet 12 can be set close to any vertex angle, and the air inlet duct 14 is formed between the horizontal plate 161 forming the vertex angle and the bracket 20; the air outlet 13 is close to the vertex angle set diagonally to the vertex angle.

[0053] The air inlet 12 and the air outlet 13 may be disposed on the horizontal plate 161 or on the vertical plate 162. In some embodiments, the air inlet 12 is located at the projection of the air inlet duct 14 on the battery box 10 along the second direction X, that is, the air inlet 12 is disposed at the vertical plate 162 located at the end of the air inlet duct 14, thereby, the cooling air at the air inlet 12 enters the air inlet duct 14 along the second direction X, which can improve the uniformity of the cooling air distributed to each branch duct 42, thereby further reducing the temperature difference between different battery cells 30.

[0054] See also Figure 2 and Fig. 9 A wind nozzle 43 can be provided at the air inlet 12. The wind nozzle 43 passes through the air inlet 12. The first end of the wind nozzle 43 is arranged outside the battery box 10, and the second end of the wind nozzle 43 is arranged inside the battery box 10. The wind nozzle 43 can play a guiding role; the pipe area at the first end of the wind nozzle 43 is larger than the pipe area at the second end, which can increase the cooling wind flow rate entering the air inlet duct 14, thereby ensuring that the cooling wind can reach the bracket 20 at the end and the battery cell 30 on the bracket 20.

[0055] The projection of the second end of the air nozzle 43 along the first direction Y is located on the bracket 20 at the end. The cooling air enters the air inlet duct 14 from the second end of the air nozzle 43. By controlling the position of the second end of the air nozzle 43, the cooling air flowing out of the second end of the air nozzle 43 can be prevented from entering the air outlet duct 15 from the gap between the bracket 20 at the end and the vertical plate 162. In other embodiments, a sealing member can also be filled between the bracket 20 at the end and the vertical plate 162 to increase the amount of cooling air distributed to the branch air duct 42, thereby improving the heat exchange efficiency.

[0056] A spoiler block 45 is provided at the bottom of the battery box 10, and the spoiler block 45 is located in the air inlet duct 14 and the air outlet duct 15. It can be understood that the cooling air flows along the second direction X in the air inlet duct 14 and the air outlet duct 15. However, due to the existence of the spoiler block 45, when the cooling air flows through the spoiler block 45, the cooling air follows the ups and downs of the spoiler block 45, and flows along the spoiler block 45 first obliquely upward, then parallel, and finally downward, constantly changing the wind direction, thinning the boundary layer of the wall of the air inlet duct 14 and the air outlet duct 15, and increasing the cooling rate.

[0057] In order to concentrate the cooling air on the side close to the bracket 20 and the battery cell 30, the spoiler block 45 bulges toward the bracket 20, that is, the two cross plates 161 are provided with spoiler blocks 45 bulging toward the bracket 20 and the battery cell 30, and the spoiler blocks 45 are connected to the bottom plate of the battery box 10.

[0058] See also Figure 2 , Figure 8 and Fig. 9 A plurality of mounting racks 22 may be provided on one side of the partition 21. In the present application, a structure for mounting a battery cell 30 is referred to as a mounting rack 22. Thus, a plurality of battery cells 30 may be provided on a bracket 20, so that more battery cells 30 can be connected in series and in parallel to meet different power output requirements.

[0059] In other embodiments, there may be different division methods. For example, the structure on one side of the partition 21 is collectively referred to as a mounting frame 22, and a mounting frame 22 can fix multiple battery cells 30 along the first direction Y. Alternatively, one side of a bracket 20 can only fix one battery cell 30, and multiple brackets 20 are arranged adjacent to each other along the first direction Y to form a side with multiple battery cells 30 arranged along the first direction Y. This application does not limit this.

[0060] It can be understood that when the cooling wind flows through the branch air duct 42, the cooling wind will exchange heat with the battery cell 30, so that the closer to the outlet air duct 15, the higher the temperature of the cooling wind, and the worse the heat exchange effect between the heated cooling wind and the battery cell 30. In some embodiments, the end of the bracket 20 close to the outlet air duct 15 forms a cavity 23, and the cavity 23 can be filled with a heat exchange medium. The heat exchange medium can absorb the heat in the cooling wind, thereby reducing the temperature of the battery cell 30 close to the end of the outlet air duct 15, reducing the temperature difference of the battery cells 30 arranged along the first direction Y, and when the battery pack 100 is at low power or not working, the heat exchange medium can slowly release heat, thereby reducing the impact on the battery cell 30.

[0061] The heat exchange medium is a phase change material, and the melting point of the phase change material is selected to be in the range of 20°C to 40°C, which can prevent the battery cell 30 from overheating at the end close to the air outlet duct 15. The heat exchange medium can be paraffin or a mixture of paraffin and fatty acid.

[0062] In other embodiments, the horizontal plate 161 that surrounds the air outlet duct 15 may also be filled with phase change material. This embodiment is described by taking an installation frame 22 with two battery cells 30 as an example. The multiple battery cells 30 close to the air inlet duct 14 are area A, and the multiple battery cells 30 close to the air outlet duct 15 are area B. The cooling air is distributed to each branch duct 42 in the air inlet duct 14, absorbs the heat generated by the battery cells 30 in areas A and B, and then converges in the air outlet duct 15. It can be understood that the cooling air in the air outlet duct 15 absorbs a large amount of heat, and its temperature is higher than that of the air inlet duct 14, which further affects the end surface temperature of the battery cells 30 in area B, and easily makes the battery cell temperature in area B significantly higher than that in area A. In this embodiment, when the cooling wind converges to the air outlet duct 15, the temperature of the cooling wind is conducted through the transverse plate 161, causing the phase change material filled in the transverse plate 161 to undergo a phase change. The phase change material absorbs the heat in the cooling wind and stores it inside itself. The temperature of the cooling wind at the air outlet duct 15 decreases, and the end surface temperature of the battery cell 30 in the B area decreases, reducing the temperature difference between the battery cells 30 in the A and B areas. When the battery box 10 is at low power or not working, the phase change material filled in the transverse plate 161 will slowly release heat to the outside, and the impact on the battery cell 30 is very small at this time.

[0063] In the present application, the mounting frame 22 may include a support plate and a pressure plate, and the battery cell 30 is placed on the support plate and positioned by the pressure plate. The mounting frame 22 may also include a support plate and a limit plate, and the battery cell 30 is placed on the support plate and limited between the partition 21 and the limit plate. The present application does not limit the specific structure of the mounting frame 22. It should be noted that the mounting frame 22 cannot completely block the battery cell 30 along the first direction Y, and an opening communicating with the branch air duct 42 should be left to facilitate the cooling air to flow into and out of the branch air duct 42.

[0064] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0065] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises a bracket and a battery cell. The battery cell is arranged on at least one side of the bracket. A spoiler concave point is arranged on at least one of an outer surface of the battery cell and a side surface of the bracket facing the battery cell.

2. The battery pack according to claim 1, characterized in that: The battery cells are arranged on opposite sides of the bracket, and there is a gap between at least one of the battery cells and the bracket.

3. The battery pack according to claim 2, characterized in that: Among the two battery cells located on both sides of the bracket, there is a gap between one battery cell and the bracket, and the other battery cell is in contact with the bracket; the spoiler concave point on the bracket passes through the bracket, and the spoiler concave point is gradually set in a direction away from the gap side.

4. The battery pack according to claim 1, characterized in that: At least two battery cells are arranged along a first direction on one side of the bracket, and the first direction intersects with an arrangement direction of the bracket and the battery cells; a cavity is formed at one end of the bracket, and the cavity is used to fill a heat exchange medium.

5. The battery pack according to claim 1, characterized in that: The bracket comprises a partition and a mounting frame arranged on at least one side of the partition, and the battery cell is arranged on the mounting frame.

6. The battery pack according to claim 1, characterized in that: The battery pack comprises a battery box having a cavity, wherein the battery box is provided with an air inlet and an air outlet communicated with the cavity, and the bracket and the battery cell are both arranged in the cavity and located between the air inlet and the air outlet.

7. The battery pack according to claim 6, characterized in that: The inner wall of the battery box is provided with a spoiler block protruding toward the bracket, and the spoiler block is used to change the flow direction of the heat exchange medium when the heat exchange medium flows in the battery box.

8. The battery pack according to claim 7, characterized in that: A plurality of the brackets arranged along a second direction are arranged in the cavity, and the second direction is the arrangement direction of the brackets and the battery cells; among two adjacent brackets, the battery cells on one bracket are spaced from the other bracket or the battery cells on the other bracket.

9. The battery pack according to claim 8, characterized in that: Among the multiple brackets, the two brackets located at the two ends are respectively a first bracket and a second bracket; the air inlet is arranged close to the first bracket, and the air outlet is arranged close to the second bracket.

10. The battery pack according to claim 8, characterized in that: An air inlet duct and an air outlet duct are respectively formed between the two sides of the plurality of brackets along the first direction and the side wall of the battery box; the air inlet is communicated with the air inlet duct, and the air outlet is communicated with the air outlet duct; A branch air duct is formed between the battery cell and the adjacent bracket or between the battery cell and the adjacent battery cell, and the branch air duct connects the air inlet duct and the air outlet duct.

11. The battery pack according to claim 10, characterized in that: The air inlet is located at a projection of the air inlet duct on the battery box along the second direction.

12. The battery pack according to claim 11, characterized in that: An air nozzle is provided at the air inlet, a first end of the air nozzle is arranged outside the battery box, a second end of the air nozzle is arranged inside the battery box, and a pipe area of ​​the first end of the air nozzle is larger than a pipe area of ​​the second end.

13. The battery pack according to claim 12, characterized in that: The projection of the second end of the air nozzle along the first direction is located on the bracket at the end.

14. An electrical device, characterized in that: The electric device comprises the battery pack according to any one of claims 1 to 13.

15. A vehicle, characterized in that: The vehicle comprises a battery pack according to any one of claims 1 to 13.

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