Core stack cooling device and battery module

Abstract

The utility model discloses a core pile cooling device and a battery module, the core pile cooling device comprises a box body, and an upper air guide piece and a lower air guide piece which are oppositely arranged in the box body; an accommodating space is formed in the box body and is used for placing a battery cell; the upper air guide piece is arranged in the containing space, an upper air channel is formed between the upper air guide piece and the box body, an upper air opening is formed in the upper air guide piece, and the upper air channel, the upper air opening and the containing space are sequentially communicated; the lower air guide part is arranged on the side, opposite to the upper air guide part, in the containing space, a lower air channel is formed between the lower air guide part and the box body, a lower air opening is formed in the lower air guide part, the lower air channel, the lower air opening and the containing space are sequentially communicated, and an air inlet and an air outlet which are communicated with the outside are formed in the two opposite ends of the containing space. The upper air duct and the lower air duct are respectively communicated with the air inlet. The cell stack cooling device disclosed by the utility model also can achieve a better cooling effect on the cells close to the air outlet.

Description

Technical Field

[0001] This utility model relates to the field of cell heat dissipation technology, and in particular to a cell stack cooling device and a battery module. Background Technology

[0002] During battery operation, heat generation is inevitable. To prevent overheating of the battery cell stack, installing fans within the battery module to reduce its temperature is an effective method. Cooling airflow blows through the cells, carrying away their heat and effectively preventing overheating. However, as the cooling airflow passes over the cells, it heats up as the heat is absorbed. This results in a significantly stronger cooling effect in the upwind region than in the downwind region, leading to an uneven temperature distribution across the battery cell stack, with the overall temperature increasing from the upwind region to the downwind region. Utility Model Content

[0003] One objective of this invention is to provide a core stack cooling device and a battery module, which aims to solve the technical problem of uneven temperature distribution in the core stack after air cooling.

[0004] To achieve the above objectives, the present invention provides a solution as follows: a core stack cooling device, comprising a housing and an upper air guide and a lower air guide disposed opposite to each other within the housing; the housing contains a receiving space for placing the battery cells; the upper air guide is disposed within the receiving space, and an upper air duct is formed between the upper air guide and the housing, and the upper air guide has an upper air outlet, the upper air duct, the upper air outlet, and the receiving space are sequentially connected; the lower air guide is disposed on the side of the receiving space opposite to the upper air guide, and a lower air duct is formed between the lower air guide and the housing, the lower air guide has a lower air outlet, the lower air duct, the lower air outlet, and the receiving space are sequentially connected, and air inlets and outlets connected to the outside are formed at opposite ends of the receiving space, the upper air duct and the lower air duct being respectively connected to the air inlets.

[0005] In some embodiments of this application, there are multiple upwind openings, and the opening area of ​​each upwind opening increases as it moves away from the air inlet.

[0006] In some embodiments of this application, the projection of the upper air vent onto the lower air guide does not coincide with the lower air vent.

[0007] In some embodiments of this application, the distance between the downwind vent and the air outlet is L1, and the distance between the upwind vent and the air outlet is L2, where 0.8 ≤ L1 / L2 < 1.

[0008] In some embodiments of this application, there are multiple downwind openings, and the opening area of ​​any one of the downwind openings is smaller than the opening area of ​​the upwind opening.

[0009] In some embodiments of this application, an upper guide groove is recessed on the side of the upper air guide facing the lower air guide, and the extension direction of the upper guide groove is the same as the connection direction of the air inlet and the air outlet; and / or, a lower guide groove is recessed on the side of the lower air guide facing the upper air guide, and the extension direction of the lower guide groove is the same as the connection direction of the air inlet and the air outlet.

[0010] In some embodiments of this application, the upper air guide is recessed with a plurality of upper battery cell grooves on the side facing the lower air guide, the upper battery cell grooves being used to fit and accommodate the surface of the battery cell; and / or, the lower air guide is recessed with a plurality of lower battery cell grooves on the side facing the upper air guide, the lower battery cell grooves being used to fit and accommodate the surface of the battery cell.

[0011] In some embodiments of this application, the core stack cooling device further includes a thermally conductive pad that is attached to the upper and / or lower cell slots.

[0012] In some embodiments of this application, the upper air guide includes an upper guide plate and an upper sealing plate, an upper air duct is formed between the upper guide plate and the housing, an upper air outlet is opened on the upper guide plate, and the upper sealing plate is connected to the end of the upper guide plate near the air outlet and blocks the upper air duct; and / or, the lower air guide includes a lower guide plate and a lower sealing plate, a lower air duct is formed between the lower guide plate and the housing, a lower air outlet is opened on the lower guide plate, and the lower sealing plate is connected to the end of the lower guide plate near the air outlet and blocks the lower air duct.

[0013] To achieve the above objectives, the present invention provides a solution as follows: a battery module, the battery module including a battery cell and a cell stack cooling device as described above, wherein the battery cell is placed in an accommodating space.

[0014] In some embodiments of this application, the battery module further includes a fan, which is disposed at the air outlet and is used to draw air out of the accommodating space.

[0015] In some embodiments of this application, the battery cells are arranged in multiple rows from the air inlet to the air outlet of the accommodating space, and the distance between each row of battery cells and the air inlet increases as it approaches the upper air guide.

[0016] In some embodiments of this application, the battery cell located at the air inlet end of the accommodating space is tangent to the same virtual plane, and the normal of the virtual plane on the side closer to the battery cell points to the lower air guide.

[0017] The beneficial effects of this utility model are as follows:

[0018] An upper air duct is formed between the upper air guide and the housing, and the upper air guide has an upper air outlet. The upper air duct, the upper air outlet, and the accommodating space are sequentially connected. A lower air duct is formed between the lower air guide and the housing, and the lower air guide has a lower air outlet. The lower air duct, the lower air outlet, and the accommodating space are sequentially connected. Air inlets and outlets that communicate with the outside are formed at opposite ends of the accommodating space, and the upper and lower air ducts are respectively connected to the air inlets.

[0019] When cooling gas is blown in from the air inlet, part of the airflow is similar to the air-cooled flow channel in the prior art. This airflow passes through the core stack and is blown out from the air outlet, carrying away the heat of the core stack while its own temperature rises. The remaining airflow is divided into upper and lower air ducts, respectively, and enters the upper and lower air ducts. It maintains a lower temperature in the upper and lower air ducts until the middle of the core stack, and then replenishes the containment space through the upper and lower air outlets, thereby reducing the airflow temperature in the containment space and also achieving a better cooling effect on the core stack near the air outlet. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the battery module provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the battery module after removing part of the casing provided in this embodiment of the utility model;

[0023] Figure 3 It is along Figure 1 Schematic diagram of the cross section of line AA;

[0024] Figure 4 yes Figure 3 A magnified view of a portion of region B in the middle;

[0025] Figure 5 yes Figure 3 A magnified view of a portion of region C in the middle;

[0026] Figure 6 This is a schematic diagram of the overall structure of the upper air guide provided in this embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the overall structure of the lower air guide provided in this embodiment of the utility model;

[0028] Figure 8 It is along Figure 1 A cross-sectional schematic diagram of the DD line.

[0029] Explanation of icon numbers:

[0030] 10. Housing; 11. Compartment space; 12. Air inlet; 13. Air outlet; 20. Upper air guide; 21. Upper air duct; 22. Upper air outlet; 23. Upper airflow channel; 24. Upper battery cell slot; 25. Upper guide plate; 26. Upper sealing plate; 30. Lower air guide; 31. Lower air duct; 32. Lower air outlet; 33. Lower airflow channel; 34. Lower battery cell slot; 35. Lower guide plate; 36. Lower sealing plate; 40. Thermal pad; 50. Battery cell; 60. Fan. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1 to 5 As shown, Figure 1 This is a schematic diagram of the overall structure of the battery module provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the battery module after removing part of the housing 10 provided in this embodiment of the utility model; Figure 3 It is along Figure 1 Schematic diagram of the cross section of line AA; Figure 4 yes Figure 3 A magnified view of a portion of region B in the middle; Figure 5 yes Figure 3 A magnified view of a portion of region C.

[0033] Air cooling is a cooling technology that uses airflow to blow cooling air into the device to be cooled, and the cooling airflow carries away the heat from the device. As heat is transferred from the device to the cooling airflow, the temperature of the cooling airflow gradually increases from the upper end of the device to the lower end. This means that the cooling effect of air cooling gradually weakens from the upper end to the lower end, resulting in a relatively uneven temperature distribution in the device. This can affect the wear and tear of the device and cause trouble for its maintenance.

[0034] To solve the above-mentioned technical problems, this utility model discloses a core stack cooling device, which includes a housing 10 and an upper air guide 20 and a lower air guide 30 arranged opposite to each other inside the housing 10.

[0035] Specifically, the housing 10 has a storage space 11 for placing the battery cell 50; the upper air guide 20 is disposed in the storage space 11, and an upper air duct 21 is formed between the upper air guide 20 and the housing 10. The upper air guide 20 has an upper air outlet 22, and the upper air duct 21, the upper air outlet 22 and the storage space 11 are connected in sequence; the lower air guide 30 is disposed in the storage space 11 on the side opposite to the upper air guide 20, and a lower air duct 31 is formed between the lower air guide 30 and the housing 10. The lower air guide 30 has a lower air outlet 32, and the lower air duct 31, the lower air outlet 32 ​​and the storage space 11 are connected in sequence. At opposite ends of the storage space 11, an air inlet 12 and an air outlet 13 are formed to communicate with the outside. The upper air duct 21 and the lower air duct 31 are respectively connected to the air inlet 12.

[0036] In the use of the core stack cooling device provided by this utility model, the battery cells 50 to be cooled are stacked in the accommodating space 11, and the cooling airflow is introduced from the air inlet 12. The cooling airflow is divided into three airflows in the core stack cooling device, hereinafter referred to as the first airflow, the second airflow, and the third airflow: the first airflow passes between the upper air guide 20 and the lower air guide 30 and cools the battery cells 50, and then blows out from the air outlet 13; the second airflow flows through the upper air duct 21 and the upper air outlet 22, and then merges into the first airflow; the third airflow flows through the lower air duct 31 and the lower air outlet 32, and then merges into the first airflow. Since the second airflow and the third airflow do not directly contact the battery cells 50 before merging into the first airflow, the second airflow and the third airflow can maintain a lower temperature compared with the first airflow that directly absorbs the heat of the battery cells 50. That is, when the second airflow and the third airflow merge into the first airflow, the temperature of the total airflow is lower than that of the first airflow before merging, so it can achieve a better cooling effect on the battery cells 50 near the air outlet 13.

[0037] Compared with existing air-cooling technology, the core stack cooling device provided by this invention can still maintain a lower cooling airflow temperature in the downwind area of ​​the core stack, so as to ensure a better cooling effect in the downwind area and a more uniform temperature throughout the core stack, effectively extending the service life of the core stack.

[0038] It should be noted that the core stack mentioned in this application refers to the entire assembly including at least one battery cell 50. Each battery cell 50 can be stored without power for a dedicated cooling process, or it can be connected to a circuit within the housing space 11 to allow the core stack to operate and cool simultaneously, preventing overheating. Furthermore, the downwind and upwind regions defined in this application are relative to the direction of the cooling airflow. In the core stack, the upwind region is the portion relatively close to the air inlet 12, and the downwind region is the portion relatively close to the air outlet 13. This division is independent of the upper air guide 20 and the lower air guide 30.

[0039] Please refer to the following: Figure 6 As shown, Figure 6 This is a schematic diagram of the overall structure of the upper air guide 20 provided in this embodiment of the utility model.

[0040] In some embodiments of this application, there are multiple upwind openings 22, and the opening area of ​​each upwind opening 22 increases as it moves away from the air inlet 12.

[0041] On the one hand, more upwind openings 22 can distribute the airflow more evenly, resulting in a more uniform cooling effect on the core reactor. On the other hand, as the second and third airflows merge into the first airflow, the air pressure in the containment space 11 increases from the air inlet 12 to the air outlet 13. That is, the closer to the air outlet 13, the more difficult it is for the second airflow to merge into the first airflow. A larger opening area of ​​the upwind opening 22 can reduce the specific perimeter of the upwind opening 22, reduce the deceleration effect of the edge on the second airflow, and enable the second airflow to merge normally and cool the core reactor.

[0042] In some embodiments of this application, the projection of the upper air vent 22 onto the lower air guide 30 does not coincide with the lower air vent 32.

[0043] The projections of the upwind vent 22 and the downwind vent 32 do not overlap, meaning that the second and third airflows merge into the first airflow at staggered locations, resulting in a more uniform cooling effect on the first airflow and a better cooling effect on the core reactor.

[0044] In some embodiments of this application, the distance between the downwind vent 32 and the air outlet 13 is L1, and the distance between the upwind vent 22 and the air outlet 13 is L2, where 0.8 ≤ L1 / L2 < 1.

[0045] 0.8 ≤ L1 / L2 < 1, meaning the upper vent 22 is farther from the lower vent 32 than the lower vent 13. During core reactor cooling, the cooling airflow heats up, and the heated first airflow tends to spontaneously rise into the upper duct 21. Whether the second airflow can pass through the upper vent 22 depends on the pressure difference at the upper vent 22 and the velocity of the second airflow. The closer to the air inlet 12, the faster the velocity of the second airflow; the closer to the lower vent 13, the slower the velocity of the second airflow due to friction with the upper guide plate. Since the first airflow tends to rise, there is a pressure difference at the lower vent 32 that facilitates the spontaneous passage of the third airflow. In other words, at the same distance from the air inlet 12, the third airflow is more likely to merge into the first airflow than the second airflow. Therefore, setting the upper vent 22 farther from the lower vent 32 than the lower vent 13 can balance the difficulty of merging the second and third airflows, making their merging more uniform.

[0046] Please refer to the following: Figure 7 As shown, Figure 7 This is a schematic diagram of the overall structure of the lower air guide 30 provided in this embodiment of the utility model.

[0047] In some embodiments of this application, there are multiple downwind vents 32, and the opening area of ​​any downwind vent 32 is smaller than the opening area of ​​the upwind vent 22.

[0048] As discussed in the previous embodiment, at the same distance from the air inlet 12, the third airflow is more likely to merge into the first airflow than the second airflow. A smaller opening area at the lower air outlet 32 ​​allows the third airflow to merge into the first airflow over a wider area, resulting in a more uniform cooling effect.

[0049] Please refer to the following: Figure 8 As shown, Figure 8 It is along Figure 1 A cross-sectional schematic diagram of the DD line.

[0050] In some embodiments of this application, the upper air guide 20 is recessed on the side facing the lower air guide 30 with an upper guide groove 23, and the extension direction of the upper guide groove 23 is the same as the connection direction of the air inlet 12 and the air outlet 13; and / or, the lower air guide 30 is recessed on the side facing the upper air guide 20 with a lower guide groove 33, and the extension direction of the lower guide groove 33 is the same as the connection direction of the air inlet 12 and the air outlet 13.

[0051] For embodiments where the battery cells 50 are stacked relatively densely or where the air inlet 12 and the air outlet 13 are far apart, the design of the guide channel can avoid the obstruction of the cooling airflow, and at least ensure that after the cooling airflow enters from the air inlet 12, the high-temperature exhaust gas can be discharged from the air outlet 13.

[0052] In some embodiments of this application, the upper air guide 20 is recessed on the side facing the lower air guide 30 with a plurality of upper battery cell grooves 24, which are used to fit and accommodate the surface of the battery cell 50; and / or, the lower air guide 30 is recessed on the side facing the upper air guide 20 with a plurality of lower battery cell grooves 34, which are used to fit and accommodate the surface of the battery cell 50.

[0053] The arrangement of the upper cell slot 24 and the lower cell slot 34 allows the upper air guide 20 and the lower air guide 30 to fit the cell 50 more closely. This can help position the cell 50 and reduce the proportion of cooling airflow flowing outside the core stack, allowing more airflow to blow between the cells 50, which can further reduce the temperature of the cells 50 inside the core stack.

[0054] Furthermore, the core stack cooling device also includes a thermal pad 40, which is attached to the upper cell slot 24 and / or the lower cell slot 34.

[0055] For a small number of cells 50 in a core stack, the cooling airflow at the air outlet 13 still maintains a relatively low temperature. The thermal pad 40 can conduct the heat of the core stack in advance, allowing the second and third airflows to carry away some of the heat in advance, thereby achieving the effect of further reducing the core stack temperature.

[0056] In some embodiments of this application, the upper air guide 20 includes an upper guide plate 25 and an upper sealing plate 26, an upper air duct 21 is formed between the upper guide plate 25 and the housing 10, an upper air outlet 22 is opened on the upper guide plate 25, and the upper sealing plate 26 is connected to the end of the upper guide plate 25 near the air outlet 13 and blocks the upper air duct 21; and / or, the lower air guide 30 includes a lower guide plate 35 and a lower sealing plate 36, a lower air duct 31 is formed between the lower guide plate 35 and the housing 10, a lower air outlet 32 ​​is opened on the lower guide plate 35, and the lower sealing plate 36 is connected to the end of the lower guide plate 35 near the air outlet 13 and blocks the lower air duct 31.

[0057] The upper air duct 21 and the lower air duct 31 are blocked at the ends near the air outlet 13 by the upper sealing plate 26 and the lower sealing plate 36, respectively. This allows the second and third airflows to be discharged only from the upper air outlet 22 and the lower air outlet 32. Furthermore, all the second and third airflows will eventually merge into the first airflow and cool the core reactor, thus enhancing the cooling effect of the core reactor cooling device.

[0058] To solve the above-mentioned technical problems, this utility model also discloses a battery module, which includes a battery cell 50 and a core stack cooling device of any of the above-mentioned methods, wherein the battery cell 50 is placed in the accommodating space 11.

[0059] Because the battery module in this embodiment includes the core stack cooling device disclosed in any of the above embodiments, this embodiment also has the above-mentioned technical effects, that is, the temperature uniformity of each cell 50 in the battery module is better.

[0060] In some embodiments of this application, the battery module further includes a fan 60, which is disposed at the air outlet 13 and is used to draw air out of the accommodating space 11.

[0061] In this embodiment, the blower 60 draws out gas to form a negative pressure in the accommodating space 11. The negative pressure draws in outside gas into the accommodating space 11. Compared with the technical solution of the blower 60 pumping gas into the accommodating space 11, the gas flowing into the air inlet in this embodiment can be more evenly dispersed into the upper air duct 21 and the lower air duct 31, without the situation of insufficient air intake in the upper air duct 21 and the lower air duct 31.

[0062] In some embodiments of this application, the battery cells 50 are arranged in multiple rows from the air inlet to the air outlet of the accommodating space 11, and the distance between each row of battery cells 50 and the air inlet 12 increases as it approaches the upper air guide 20.

[0063] As previously explained, the second airflow is more difficult to merge into the first airflow than the third airflow. Therefore, the cell 50 near the air inlet 12 is tilted so that after the airflow enters the core stack cooling device, more of it is diverted to the upper air duct 21, thereby increasing the intake volume of the second airflow.

[0064] In some embodiments of this application, the battery cell 50 located at the air inlet end of the accommodating space 11 is tangent to the same virtual plane, and the normal of the virtual plane on the side closer to the battery cell 50 points to the lower air guide 30.

[0065] In this embodiment, the battery cell 50 located at the air inlet end of the accommodating space 11 is tangent to the same virtual plane. This allows the airflow entering through the air inlet to be more effectively diverted to the side closer to the upper air duct 21 after encountering the core stack, thereby increasing the intake volume of the second airflow.

[0066] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0067] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0068] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0069] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the design concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A core stack cooling device characterized by, The application relates to a battery module. The battery module comprises a box body, an upper air guide, and a lower air guide. The box body is internally formed with a containing space for placing battery cells. The upper air guide is arranged in the containing space and forms an upper air duct with the box body.

2. The core barrel cooling device of claim 1, wherein, The upper air guide is provided with an upper air outlet.

3. The core barrel cooling apparatus of claim 1, wherein, The lower air guide is arranged on the side opposite to the upper air guide in the containing space and forms a lower air duct with the box body.

4. The core barrel cooling apparatus of claim 3, wherein, The lower air guide is provided with a lower air outlet.

5. The core barrel cooling apparatus of claim 3, wherein, The containing space is sequentially communicated with the upper air duct, the upper air outlet, the lower air duct, the lower air outlet, an air inlet and an air outlet.

6. The core barrel cooling device according to any one of claims 1 to 5, characterized in that, The upper air outlet has a plurality of upper air outlets, and the opening area of each upper air outlet increases with the distance from the air inlet. The projection of the upper air outlet on the lower air guide does not coincide with the lower air outlet.

7. The core barrel cooling device according to any one of claims 1 to 5, characterized in that, The distance between the lower air outlet and the air outlet is L1, and the distance between the upper air outlet and the air outlet is L2. 0.8<=L1 / L2<1.

8. The core barrel cooling apparatus of claim 7, wherein, The lower air outlet has a plurality of lower air outlets, and the opening area of any lower air outlet is smaller than that of the upper air outlet.

9. The core barrel cooling device of any one of claims 1-5, wherein, The side of the upper air guide facing the lower air guide is concavely provided with an upper flow guide groove. The extension direction of the upper flow guide groove is the same as the connection direction of the air inlet and the air outlet.

10. A battery module, characterized by The side of the lower air guide facing the upper air guide is concavely provided with a lower flow guide groove. The extension direction of the lower flow guide groove is the same as the connection direction of the air inlet and the air outlet. The side of the upper air guide facing the lower air guide is concavely provided with a plurality of upper battery cell grooves for abutting and containing the surface of the battery cell.

11. The battery module of claim 10, wherein, The side of the lower air guide facing the upper air guide is concavely provided with a plurality of lower battery cell grooves for abutting and containing the surface of the battery cell.

12. The battery module of claim 10, wherein, The core stack cooling device further comprises a heat-conducting pad abutting the upper battery cell groove and / or the lower battery cell groove.

13. The battery module of claim 12, wherein, The upper air guide comprises an upper guide plate and an upper sealing plate. The upper guide plate and the box body form the upper air duct. The upper air outlet is arranged on the upper guide plate. The upper sealing plate is connected with the upper guide plate at one end close to the air outlet and seals the upper air duct. The lower air guide comprises a lower guide plate and a lower sealing plate. The lower guide plate and the box body form the lower air duct. The lower air outlet is arranged on the lower guide plate. The lower sealing plate is connected with the lower guide plate at one end close to the air outlet and seals the lower air duct. The battery module comprises the core stack cooling device. A plurality of battery cells are placed in the containing space. The battery module further comprises a fan arranged at the air outlet for extracting air in the containing space. The battery cells are arranged in a plurality of rows from the air inlet end to the air outlet end of the containing space. The battery cells at the air inlet end of the containing space are tangent to the same virtual plane, and the normal line of the virtual plane close to the side of the battery cells points to the lower air guide.

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