Air cooling structure and battery pack

Abstract

The present invention discloses an air-cooling structure and a battery pack. The air-cooling structure includes: a lower box body, which is provided with an air inlet and an air outlet; an air duct cover plate, which is fixed to the bottom of the box body and forms an independent air inlet duct and air outlet duct between the lower box body and the lower box body; the air inlet duct is connected to the air inlet, and the air outlet duct is connected to the air outlet; the air duct cover plate is provided with a module air inlet connected to the air inlet duct and a module air outlet connected to the air outlet duct; the air flow in the air inlet duct flows out through the module air inlet and then flows back to the air outlet duct through the module air outlet. Such a design can achieve zoned cooling of the battery cells in the battery pack, improve cooling efficiency, and meet the cooling requirements of the battery cells under high power; at the same time, the air duct cover plate is integrated into the bottom of the lower box body, which can reduce the space occupied in the lower box body, which is conducive to improving the energy density of the entire package. In addition, different air duct flow directions can be formed according to the cooling requirements of different positions to perform distributed and precise heat control.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to an air cooling structure and a battery pack. Background Art

[0002] With the increasing demand for battery range and power consumption, the excessive heat accumulated in the battery cells during operation has seriously affected their lifespan. Battery packs require cooling systems to reduce cell temperatures. The main cooling methods include liquid cooling, direct cooling, immersion cooling, and air cooling. Liquid cooling, direct cooling, and immersion cooling are costly, while air cooling channels designed into the battery pack are more cost-effective.

[0003] However, the cooling effect of the existing cooling channels in the battery pack on the battery cells is average and can only meet the cooling needs of small-power battery cells. In addition, the space occupied in the battery pack is large, which affects the improvement of the energy density of the entire battery pack. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the air-cooling structure in the battery pack in the prior art, such as poor cooling effect and large space occupation, thereby providing an air-cooling structure and a battery pack.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] An air cooling structure, comprising:

[0007] A lower box body, on which an air inlet and an air outlet are provided;

[0008] An air duct cover is fixed to the bottom of the lower box body, and an independent air inlet duct and air outlet duct are formed between the cover and the lower box body; the air inlet duct is connected to the air inlet, and the air outlet duct is connected to the air outlet; a module air inlet connected to the air inlet duct and a module air outlet connected to the air outlet duct are provided on the cover; the air flow in the air inlet duct flows out through the module air inlet and then flows back to the air outlet duct through the module air outlet.

[0009] Furthermore, the air duct cover is welded and fixed inside the lower box.

[0010] Furthermore, the air duct cover plate is provided with a blocking structure for separating the air inlet duct and the air outlet duct.

[0011] Furthermore, the blocking structure is a concave groove formed on the air duct cover plate, and the groove wall of the concave groove separates the air inlet duct and the air outlet duct; the module air inlet is opened on the air duct cover plate on one side of the concave groove, and the module air outlet is opened on the air duct cover plate on the other side of the concave groove.

[0012] Furthermore, the module air inlets are arranged in a plurality at intervals along the extension direction of the air inlet duct, and the module air outlets are arranged in a plurality at intervals along the extension direction of the air outlet duct, and the positions of the plurality of module air inlets and the plurality of module air outlets are arranged in a one-to-one correspondence.

[0013] Furthermore, there are several air inlet ducts and several air outlet ducts; the airflow flowing out of two adjacent air inlet ducts flows to the same air outlet duct located between the two air inlet ducts, and / or the airflow flowing out of one air inlet duct flows to the two air outlet ducts located on both sides of the air inlet duct.

[0014] Furthermore, the air inlet duct and the air outlet duct are any one of a straight-line duct, a broken-line duct and an arc-shaped duct, or a combination of several of them.

[0015] Furthermore, an extension wall is provided on the edge of the air duct cover plate and is sealedly connected to the inner wall of the lower box body.

[0016] Furthermore, one end of the air duct cover is provided with an air inlet bulge corresponding to the air inlet position of the lower box body, and the other end of the air duct cover is provided with an air outlet bulge corresponding to the air outlet position of the lower box body; the internal space of the air inlet bulge is communicated with the air inlet duct, and the internal space of the air outlet bulge is communicated with the air outlet duct.

[0017] Furthermore, a fixing column is provided between the air duct cover plate and the lower box body, the lower end of the fixing column is welded and fixed to the lower box body, and the upper end of the fixing column is glued and fixed to the air duct cover plate, and a threaded hole is provided on the fixing column, and the air duct cover plate is provided with a module mounting hole which is arranged corresponding to the position of the threaded hole and on which the power supply core module is installed.

[0018] The present application also proposes a battery pack, comprising the air-cooling structure as described above, a battery cell module arranged above the air duct cover plate and an upper cover provided on the lower box body; the battery cell module comprises a plurality of single battery cells arranged at intervals and a battery cell holder arranged between adjacent single battery cells, the battery cell holder comprises a frame-shaped holder body connected between two adjacent single battery cells, and a guide plate connected to the holder body and extending into the interior of the holder body; a cooling air duct is formed between the guide plate and the holder body, one end of the cooling air duct is connected to the module air inlet, and the other end is connected to the module air outlet.

[0019] Furthermore, the air duct cover is provided with a sealing foam located at the periphery of the module air inlet or the periphery of the module air outlet and used for sealing the gap between the battery cell module and the air duct cover.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The air-cooling structure provided by the present invention has an air duct cover fixed on the lower box body, and an integrated air duct structure is formed between the air duct cover plate and the lower box body. The air duct structure includes independent air inlet ducts and air outlet ducts. The air duct cover plate is provided with a module air inlet connected to the air inlet duct and a module air outlet connected to the air outlet duct; the air flow in the air inlet duct flows out through the module air inlet and then flows back to the air outlet duct through the module air outlet, thereby cooling the battery cell module in the lower box body; the air inlet duct and the air outlet duct of this air duct structure are independently arranged, which can realize zoned cooling of the battery cell module in the lower box body and improve cooling efficiency.

[0022] 2. Compared with the extruded lower box with an air duct inside in the prior art, the air cooling structure provided by the present invention can realize the complex design of the air duct structure. It can form different air duct flow directions according to the cooling requirements of different positions of the battery cell module, and perform distributed and precise heat control.

[0023] 3. The air-cooling structure provided by the present invention has an air duct cover plate which not only constitutes the air duct structure but also can enhance the structural strength of the lower box body. There is no need to set up an additional reinforcement structure on the lower box body, which is beneficial to reducing the space occupied by the air duct structure in the lower box body and improving the energy utilization rate of the whole package.

[0024] 4. The air-cooling structure provided by the present invention has an air inlet duct and an air outlet duct separated by the groove wall of a concave groove. The design of two adjacent air inlet ducts sharing the same air outlet duct, or two adjacent air outlet ducts sharing the same air inlet duct can reduce the number of upper and lower concave grooves on the air duct cover plate, reduce the cost of the air duct cover plate, and reduce the space occupied by the air duct cover plate in the lower box.

[0025] 5. The air-cooling structure provided by the present invention has an air inlet duct and an air outlet duct that are any one or a combination of straight-line ducts, broken-line ducts and arc-shaped ducts, which can realize a more complex air duct design inside the lower box. Compared with the prior art in which the air inlet duct and the air outlet duct can only be designed as a straight line, the structural form of the air duct is greatly enriched, and the restriction of the air duct shape on the arrangement position of the battery cell module in the lower box is avoided, and the arrangement of the battery cell module in the lower box can be more flexible.

[0026] 6. In the battery pack provided by the present invention, the air flow in the air inlet duct flows out through the module air inlet, flows along the cooling air duct in the battery cell holder to the module air outlet and flows back to the air outlet duct. This air duct design can cool the side of the single battery cell, improve the cooling efficiency, and meet the battery cell cooling requirements under high power. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the first side structure of the lower box body and the air duct cover provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the second side structure of the lower box body and the air duct cover provided by an embodiment of the present invention;

[0030] Figure 3 An exploded schematic diagram of the lower box and the air duct cover provided in an embodiment of the present invention;

[0031] Figure 4 A schematic structural diagram of a lower box provided in an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of an air duct cover provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the air duct flow direction of the air cooling structure provided by an embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of a fixing column provided in an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the structure of the sealing foam provided by an embodiment of the present invention;

[0036] Figure 9 A schematic diagram of the air duct flow direction of another air cooling structure provided in an embodiment of the present invention.

[0037] Explanation of the accompanying symbols: 1. Lower box body; 101. Air inlet; 102. Air outlet; 2. Air duct cover; 201. Air inlet duct; 202. Air outlet duct; 203. Module air inlet; 204. Module air outlet; 205. Concave groove; 206. Extension wall; 207. Air inlet bulge; 208. Air outlet bulge; 209. Module mounting hole; 3. Fixing column; 4. Upper cover; 5. Battery cell module; 51. Single battery cell; 52. Battery cell bracket; 521. Bracket body; 522. Guide plate; 523. Cooling air duct; 6. Sealing foam; 7. Lower box body fixing foot; 8. Battery cell bracket. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] like Figure 1-8The air-cooling structure shown includes a lower box body 1 and an air duct cover plate 2. The lower box body 1 includes a bottom plate and four surrounding side plates. The side plates and the bottom plate are integrally formed, and the side plates are enclosed on the bottom plate to form a storage space. An air inlet 101 and an air outlet 102 are respectively provided on the two side plates on opposite sides of the lower box body 1. The air duct cover plate 2 is fixed to the bottom of the lower box body 1 and forms a mutually independent air inlet duct 201 and air outlet duct 202 between the lower box body 1 and the air duct cover plate 2. The air inlet duct 201 is connected to the air inlet 101, and the air outlet duct 202 is connected to the air outlet 102. The air duct cover plate 2 is provided with a module air inlet 203 connected to the air inlet duct 201 and a module air outlet 204 connected to the air outlet duct 202. This air-cooling structure uses an air duct cover 2 and a lower box body 1 to form an integrated air duct structure, and the integrated air duct structure includes an independent air inlet duct 201 and an air outlet duct 202; the air flow in the air inlet duct 201 flows out through the module air inlet 203 to cool the components in the lower box body 1, and then flows back to the air outlet duct 202 through the module air outlet 204, which can realize zoned cooling of the components in the lower box body 1 and improve cooling efficiency.

[0043] In this embodiment, the materials of the lower box body 1 and the air duct cover plate 2 are both steel. The lower box body 1 is processed by a sheet metal forming process. There is no need to set a complex structure on the bottom plate of the lower box body 1. The overall structure is simple and can be stamped and formed in large quantities with high forming efficiency. The air duct cover plate 2 is made by a sheet metal integrated forming process. A complex air duct shape can be formed on the air duct cover plate 2. The air duct cover plate 2 is welded with the lower box body 1 to form a sealed air duct structure, thereby realizing a complex design of the air duct structure. Different air duct flow directions can be formed according to the cooling needs of different positions, and distributed precise heat management and control can be performed. In addition, the shape of the air duct cover plate 2 can also strengthen the structural strength of the lower box body 1. There is no need to set an additional reinforcement structure on the lower box body 1, which is beneficial to reducing the space occupied by the air duct structure in the lower box body 1 and improving the energy utilization rate of the whole package.

[0044] In this embodiment, the air duct cover plate 2 is provided with a barrier structure that separates the air inlet duct 201 from the air outlet duct 202. When the air duct cover plate 2 is welded to the lower housing 1, the lower end of the barrier structure tightly abuts against the bottom plate of the lower housing 1, thereby separating the air inlet duct 201 from the air outlet duct 202. In an alternative embodiment, a barrier structure may also be formed on the bottom plate of the lower housing 1, with the upper end of the barrier structure being sealed to the air duct cover plate 2.

[0045] Specifically, the barrier structure is a concave groove 205 integrally formed on the duct cover 2. The sidewalls of the concave groove 205 separate the inlet duct 201 from the outlet duct 202. The module inlet 203 is provided on the duct cover 2 on one side of the concave groove 205, and the module outlet 204 is provided on the duct cover 2 on the other side of the concave groove 205. The design of forming the concave groove 205 on the duct cover 2 to separate the inlet duct 201 from the outlet duct 202 has a simple structure and is easy to process and form.

[0046] In this embodiment, multiple module air inlets 203 are arranged at intervals along the extension direction of the air inlet duct 201, and multiple module air outlets 204 are arranged at intervals along the extension direction of the air outlet duct 202, and the positions of the multiple module air inlets 203 and the multiple module air outlets 204 are arranged in a one-to-one correspondence. When this lower box 1 and air duct cover 2 are applied to the battery pack, the battery cell module 5 is placed above the air duct cover 2. The battery cell module 5 includes a plurality of single battery cells 51 arranged at intervals and a battery cell holder 52 arranged between adjacent single battery cells 51. The position of the single battery cell 51 on the air duct cover 2 is located on the air duct cover 2 between two adjacent module air inlets 203 and corresponding two adjacent module air outlets 204. The battery cell holder 52 is placed between a corresponding pair of module air inlets 203 and module air outlets 204. The airflow flowing out of the module air inlet 203 cools the side of the single battery cell 51 with the largest surface area, which can improve the cooling effect of the single battery cell 51 and meet the battery cell cooling requirements under high power.

[0047] In some implementations of this embodiment, both the inlet duct 201 and the outlet duct 202 are linear ducts and are arranged parallel to each other. There are two inlet ducts 201 and one outlet duct 202, and the two inlet ducts 201 are located on opposite sides of the outlet duct 202. The width of the outlet duct 202 is the sum of the widths of the two inlet ducts 201. A row of module air inlets 203 is provided along the length of the inlet duct 201, and two rows of module air outlets 204 are provided along the length of the outlet duct 202. One row of module air outlets 204 corresponds one-to-one with a row of module air inlets 203 on one of the inlet ducts 201, and the other row of module air outlets 204 corresponds one-to-one with a row of module air inlets 203 on another of the inlet ducts 201. The design of this air duct structure is suitable for setting up a double row of battery cell modules 5 in the lower box 1. Each row of battery cell modules 5 corresponds to a pair of air inlet ducts 201 and air outlet ducts 202. After the air enters the air inlet ducts 201 on both sides, it is merged into the air outlet duct through the module air inlet 203 and the module air outlet 204, which can improve the cooling efficiency. Moreover, since there are two air inlet ducts, one of the air inlet ducts can be selected as needed to enter the air, or the air intake volume on the two air inlet ducts can be controlled to be different, so as to realize the zoned cooling of the battery cell modules 5 in different areas. When the temperature of the battery cell modules 5 in one area of ​​the lower box 1 is too high and needs to be cooled quickly, the air volume can be controlled to enter the corresponding air inlet duct to improve the cooling efficiency and realize the distributed control of the battery cell thermal management. In an alternative embodiment, the number of air inlet ducts 201 can also be set to three or less, and adaptively adjusted according to the number of rows of battery cell modules 5 in the lower box 1; or one air inlet duct 201 and two air outlet ducts 202 can be set, and the two air outlet ducts 202 are respectively located on both sides of the air inlet duct.

[0048] In other implementations of this embodiment, refer to Figure 9As shown, the air inlet duct 201 and the air outlet duct 202 can also be zigzag ducts, with two air inlet ducts 201 and two air outlet ducts 202 each forming a rhombus shape. The two air inlet ducts 201 are located outside the two air outlet ducts 202, and a barrier structure (not shown) is provided between the air inlet duct 201 and the air outlet duct 202. It is understood that the air inlet duct 201 and the air outlet duct 202 can also be curved ducts, or a complex duct shape formed by a combination of straight ducts, zigzag ducts, and curved ducts. The duct cover plate 2 can be manufactured by stamping to obtain any of the above-mentioned duct shapes. Such a design can realize a more complex air duct design inside the lower box body 1. Compared with the prior art in which the air inlet duct 201 and the air outlet duct 202 can only be designed as a straight line, the structural form of the air duct is greatly enriched, and the restriction of the air duct shape on the arrangement position of the battery module 5 in the lower box body 1 is avoided. The arrangement of the battery module 5 in the lower box body 1 can be more flexible.

[0049] In this embodiment, the edge of the air duct cover plate 2 is provided with an extension wall 206 that is sealed against the inner wall of the lower housing 1. The provision of the extension wall 206 facilitates sealing after the air duct cover plate 2 and the lower housing 1 are welded. An air inlet bump 207 is provided at one end of the air duct cover plate 2, corresponding to the air inlet 101 of the lower housing 1. An air outlet bump 208 is provided at the other end of the air duct cover plate 2, corresponding to the air outlet 102 of the lower housing 1. The interior space of the air inlet bump 207 communicates with the air inlet duct 201, and the interior space of the air outlet bump 208 communicates with the air outlet duct 202.

[0050] In this embodiment, a fixing column 3 is further provided between the air duct cover 2 and the lower box body 1. The lower end of the fixing column 3 is welded and fixed to the lower box body 1, and the upper end of the fixing column 3 is glued and fixed to the air duct cover 2. A threaded hole is provided on the fixing column 3, and the air duct cover 2 is provided with a module mounting hole 209 which is arranged corresponding to the position of the threaded hole and on which the power core module 5 is installed.

[0051] An embodiment of the present invention further provides a battery pack, comprising the aforementioned lower case 1 and air duct cover 2, a cell module 5 disposed above the air duct cover 2, and an upper cover 4 covering the lower case 1. The cell module 5 comprises a plurality of individual cells 51 arranged in an intermittent manner and a cell holder 52 disposed between adjacent individual cells 51. The cell holder 52 comprises a frame-shaped holder body 521 connected between two adjacent individual cells 51, and a guide plate 522 connected to the holder body 521 and extending into the interior of the holder body 521; a cooling air duct 523 is formed between the guide plate 522 and the holder body 521, with opposite sides of the guide plate 522 attached to two adjacent individual cells 51. The cooling air duct 523 is arc-shaped, with one end of the cooling air duct 523 communicating with the module air inlet 203 and the other end communicating with the module air outlet 204. The air duct cover plate 2 is provided with a sealing foam 6 located at the periphery of the module air inlet 203 or the periphery of the module air outlet 204 for sealing the gap between the battery module 5 and the air duct cover plate 2 .

[0052] The cooling principle of this battery pack is as follows: after air enters the air inlet 101 of the lower box 1, it enters the two air inlet ducts 201 on both sides. After the air flow in the air inlet duct 201 flows out through the module air inlet 203 on the air duct cover 2, it flows along the cooling air duct 523 in the battery cell bracket 52 to the module air outlet 204 and returns to the air outlet duct 202, and then flows out from the air outlet 102 of the lower box 1; this air duct structure design can cool the side of the single battery cell 51, improve the cooling efficiency, and meet the battery cell cooling requirements under high power; at the same time, according to the cooling requirements of the battery cells at different positions in the battery pack, the battery cells can be cooled in zones, and distributed control of thermal management can be achieved.

[0053] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An air cooling structure, characterized in that: include: A lower box body (1) is provided with an air inlet (101) and an air outlet (102); An air duct cover plate (2) is fixed to the bottom of the lower box body (1) and forms an independent air inlet duct (201) and an air outlet duct (202) between the air inlet duct (201) and the lower box body (1); the air inlet duct (201) is connected to the air inlet (101), and the air outlet duct (202) is connected to the air outlet (102); a module air inlet (203) connected to the air inlet duct (201) and a module air outlet (204) connected to the air outlet duct (202) are provided on the air duct cover plate (2); the air flow in the air inlet duct (201) flows out through the module air inlet (203) and then flows back to the air outlet duct (202) through the module air outlet (204); The air duct cover plate (2) is an integrally formed sheet metal part, and a partition structure is provided on the air duct cover plate (2) for separating the air inlet duct (201) and the air outlet duct (202); The blocking structure is a concave groove (205) formed on the air duct cover plate (2), and the groove wall of the concave groove (205) separates the air inlet duct (201) and the air outlet duct (202); the module air inlet (203) is opened on the air duct cover plate (2) on one side of the concave groove (205), and the module air outlet (204) is opened on the air duct cover plate (2) on the other side of the concave groove (205).

2. The air cooling structure according to claim 1, characterized in that: The air duct cover plate (2) is welded and fixed inside the lower box body (1).

3. The air cooling structure according to any one of claims 1-2, characterized in that: A plurality of the module air inlets (203) are arranged at intervals along the extension direction of the air inlet duct (201), and a plurality of the module air outlets (204) are arranged at intervals along the extension direction of the air outlet duct (202), and the positions of the plurality of the module air inlets (203) and the plurality of the module air outlets (204) are arranged in a one-to-one correspondence.

4. The air cooling structure according to any one of claims 1 to 2, characterized in that: The air inlet duct (201) and the air outlet duct (202) are both provided with a plurality of air inlets; the air flow out of two adjacent air inlet ducts (201) flows toward the same air outlet duct (202) located between the two air inlet ducts (201), and / or the air flow out of one air inlet duct (201) flows toward the two air outlet ducts (202) located on both sides of the air inlet duct (201).

5. The air cooling structure according to any one of claims 1 to 2, characterized in that: The air inlet duct (201) and the air outlet duct (202) are any one of a straight-line duct, a broken-line duct and an arc-shaped duct, or a combination of several of them.

6. The air cooling structure according to any one of claims 1-2, characterized in that: An extension wall (206) is provided on the edge of the air duct cover plate (2) and is sealed to the inner wall of the lower box body (1).

7. The air cooling structure according to any one of claims 1-2, characterized in that: One end of the air duct cover plate (2) is provided with an air inlet convex bump (207) arranged corresponding to the position of the air inlet (101) of the lower box body (1), and the other end of the air duct cover plate (2) is provided with an air outlet convex bump (208) arranged corresponding to the position of the air outlet (102) of the lower box body (1); the internal space of the air inlet convex bump (207) is communicated with the air inlet duct (201), and the internal space of the air outlet convex bump (208) is communicated with the air outlet duct (202).

8. The air cooling structure according to any one of claims 1-2, characterized in that: A fixing column (3) is further provided between the air duct cover plate (2) and the lower box body (1); the lower end of the fixing column (3) is welded and fixed to the lower box body (1); the upper end of the fixing column (3) is glued and fixed to the air duct cover plate (2); a threaded hole is provided on the fixing column (3); and the air duct cover plate (2) is provided with a module mounting hole (209) which is arranged corresponding to the position of the threaded hole and on which the power supply core module (5) is mounted.

9. A battery pack, characterized in that: It comprises the air cooling structure as described in any one of claims 1 to 8, a battery module (5) arranged above the air duct cover (2), and an upper cover (4) arranged on the lower box (1); The battery module (5) comprises a plurality of single battery cells (51) arranged at intervals and a battery cell bracket (52) arranged between adjacent single battery cells (51); the battery cell bracket (52) comprises a frame-shaped bracket body (521) connected between two adjacent single battery cells (51); and a guide plate (522) connected to the bracket body (521) and extending into the interior of the bracket body (521); a cooling air duct (523) is formed between the guide plate (522) and the bracket body (521); one end of the cooling air duct (523) is connected to the module air inlet (203), and the other end is connected to the module air outlet (204).

10. The battery pack according to claim 9, characterized in that: The air duct cover plate (2) is provided with a sealing foam (6) located at the periphery of the module air inlet (203) or the periphery of the module air outlet (204) and used for sealing the gap between the battery module (5) and the air duct cover plate (2).

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