An air-cooled battery pack

Abstract

The utility model discloses a kind of air-cooled battery packs, including electric core group and shell, electric core group includes multiple electric core and air deflector, multiple electric core is arranged along first direction, air deflector is set between adjacent electric core and connects adjacent electric core, air deflector is provided with air duct along second direction, air duct penetrates air deflector, shell is formed with accommodating cavity, at least two electric core groups are placed in accommodating cavity, electric core group is side by side arranged along second direction, flow-through passage is formed between adjacent electric core group, the two sides of shell along first direction are respectively provided with air inlet and air outlet, air inlet is set to flow-through passage, air outlet is set to the two ends along second direction, wherein, first direction is the thickness direction of electric core, second direction is perpendicular to first direction, to solve the technical problem of insufficient heat exchange caused by improper airflow path in existing battery air-cooled structure.

Description

Technical Field

[0001] This utility model relates to the field of battery heat dissipation technology, and in particular to an air-cooled battery pack. Background Technology

[0002] In the actual operation of battery modules, the thermal management system plays a crucial role in ensuring their performance stability and lifespan. Especially in high-power, high-density battery modules, if the large amount of heat generated during charging and discharging cannot be dissipated effectively and promptly, it can easily lead to localized overheating of the cells, resulting in serious consequences such as capacity decay, performance degradation, and even thermal runaway. Therefore, optimizing the cooling structure of battery modules and improving their heat dissipation efficiency has become a critical issue that urgently needs to be addressed in the current technological field.

[0003] However, in air-cooled or liquid-cooled systems, the flow path of the cooling medium is not designed reasonably according to the arrangement characteristics of the battery cells, or the airflow or liquid flow path fails to form a uniform flow field distribution, resulting in the existence of "thermal islands" in some areas. Some battery cells obtain a much higher cooling effect than other areas, resulting in excessive temperature difference, which in turn affects the working balance and safety of the entire module.

[0004] Therefore, the existing battery module cooling structure has the problem of improper airflow path, which leads to technical defects such as insufficient heat exchange and uneven heat dissipation. Utility Model Content

[0005] One objective of this invention is to provide an air-cooled battery pack that addresses the technical problem of insufficient heat exchange caused by improper airflow paths in existing air-cooled battery structures.

[0006] To achieve the above objectives, the present invention provides a solution as follows: an air-cooled battery pack, comprising a cell assembly, including multiple cells and a guide plate, wherein the multiple cells are arranged along a first direction, the guide plate is disposed between adjacent cells and connects adjacent cells, and the guide plate has an air duct along a second direction, the air duct penetrating the guide plate; a housing, forming a receiving cavity, wherein at least two cell assemblies are disposed within the receiving cavity, the cell assemblies are arranged side by side along the second direction, and a flow channel is formed between adjacent cell assemblies, and the housing has an air inlet and an air outlet on both sides along the first direction, the air inlet facing the flow channel, and the air outlet at both ends along the second direction; wherein, the first direction is the cell thickness direction, and the second direction is perpendicular to the first direction.

[0007] Optionally, the housing includes an air inlet surface and an air outlet surface arranged opposite to each other, with the air inlet located on the air inlet surface and the air outlet located on the air outlet surface; the air-cooled battery pack also includes a diverter, which is disposed on the side of the air outlet surface close to the air inlet surface and faces the flow channel, and the diverter is used to divert the airflow from the first direction to both sides of the second direction.

[0008] Optionally, the housing also includes a connecting surface that connects the air inlet surface and the air outlet surface, and the connecting surface, the air inlet surface and the air outlet surface together form a receiving cavity; the air-cooled battery pack also includes a guide that is disposed on the side of the connecting surface near the receiving cavity, and the guide faces the air duct, for guiding the airflow from the air duct to the air outlet.

[0009] Optionally, the guide can be detachably connected to the connecting surface.

[0010] Optionally, there are multiple air ducts, and the multiple air ducts are distributed at intervals along a third direction on the air guide plate, wherein the third direction is the height direction of the battery cell.

[0011] Optionally, the wall thickness S of the air duct in the first direction and the width W of the air guide plate satisfy: W / 7 <S<W / 5。

[0012] Optionally, the wall thickness S of the air duct in the first direction is equal to the spacing D of the adjacent air ducts in the third direction.

[0013] Optionally, the air duct also includes microstructures, which are disposed on the inner wall of the air duct to increase the airflow contact area. The microstructures include protrusions, fins, or textures.

[0014] Optionally, the cross-sectional shape of the air duct is selected from at least one of square, circular and triangular.

[0015] Optionally, the air-cooled battery pack also includes a fan located at the air inlet and / or air outlet to improve airflow efficiency.

[0016] The beneficial effects of this utility model are as follows:

[0017] Compared to existing technologies, this invention optimizes the cooling airflow path, extending the original one-time flow of air between the cells into a two-stage cooling process. The airflow first passes through the gaps between the cells in a second direction for initial heat exchange, then continues flowing in the first direction for a second heat exchange. This path design significantly extends the contact time and area between the airflow and the cells, improving overall heat exchange efficiency. Simultaneously, the airflow covers the entire cell area, achieving a more uniform cooling effect and avoiding localized overheating or heat dissipation dead zones, thereby effectively improving the thermal stability and safety of the battery module. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is an overall schematic diagram of the air-cooled battery pack provided in this embodiment of the utility model;

[0020] Figure 2 This is an internal schematic diagram of the air-cooled battery pack provided in an embodiment of the present invention;

[0021] Figure 3 This is a partial schematic diagram of the battery cell assembly provided in an embodiment of the present utility model;

[0022] Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A magnified view of a portion of region A in the middle;

[0023] Figure 5 This is a schematic diagram of the air inlet surface of the air-cooled battery pack provided in an embodiment of this utility model.

[0024] Explanation of icon numbers:

[0025] 10. Battery cell assembly; 11. Battery cell; 12. Air guide plate; 121. Air duct; 122. Microstructure; 20. Housing; 21. Receiving cavity; 22. Flow channel; 23. Air inlet surface; 231. Air inlet; 24. Air outlet surface; 241. Air outlet; 25. Connecting surface; 30. Diverter; 40. Guide component; 50. Fan. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Please see Figure 1 and Figure 2 , Figure 1This is an overall schematic diagram of the air-cooled battery pack provided in this embodiment of the utility model. Figure 2 This is an internal schematic diagram of the air-cooled battery pack provided in an embodiment of the present invention. Figure 1 The X direction, as indicated in the diagram, is the first direction. The Y direction is the second direction, and the Z direction is the third direction.

[0030] This utility model provides an air-cooled battery pack that improves the heat dissipation performance of the battery module under high temperature or high power operating conditions by optimizing the airflow path, thereby ensuring the safety and stability of battery use.

[0031] The air-cooled battery pack includes a cell assembly 10 and a housing 20. The cell assembly 10 consists of multiple cells 11 and air guide plates 12 disposed between the cells 11. The multiple cells 11 are arranged sequentially along a first direction (i.e., the thickness direction of the cells 11). The air guide plates 12 are disposed between adjacent cells 11 and are fixedly connected to each other, forming a structurally stable integrated module. The air guide plates 12 have air ducts 121 extending through their bodies along a second direction (i.e., perpendicular to the first direction) to guide cooling airflow through the gaps between the cells 11, enhancing local heat exchange.

[0032] The housing 20 has a receiving cavity 21 for mounting multiple battery cell groups 10. These battery cell groups 10 are arranged side by side along a second direction within the receiving cavity 21, forming a flow channel 22 between adjacent battery cell groups 10 for cooling airflow. To achieve effective airflow guidance and distribution, the housing 20 has an air inlet 231 and an air outlet 241 on its two sides along a first direction, respectively. The air inlet 231 is positioned directly opposite the flow channel 22 to facilitate rapid entry of cooling airflow, while the air outlet 241 is located at both ends of the housing 20 along the second direction to guide the airflow to finally exit the housing 20.

[0033] In this embodiment, the cooling airflow first enters the housing 20 through the air inlet 231 and then enters the flow channel 22 between adjacent battery cell groups 10. In the flow channel 22, the airflow gradually enters the air duct 121 of the air guide plate 12, and then passes through the gaps between the battery cells 11 along the second direction, achieving heat exchange with the large surface area of ​​the battery cells 11. After completing the initial heat exchange in the air duct 121 of the air guide plate 12, the cooling airflow converges at both ends of the housing 20 and flows further along the first direction of the battery cells 11, finally being discharged outside the system through the air outlets 241 located at both ends of the housing 20.

[0034] Compared to existing technologies, where the cooling airflow only exchanges heat once between the cells 11 after entering the battery pack, it is then directly discharged from the air outlet 241 on the side of the casing 20. This application optimizes and extends the cooling path, allowing for two heat exchange processes before discharge from the air outlet 241. This allows the airflow to contact the surface of the cells 11 over a larger area for a longer period, further absorbing the heat emitted by the cells 11 and achieving more thorough heat exchange. Simultaneously, because the airflow path covers the entire area of ​​the cells 11, it can cool the cells 11 more evenly, avoiding the problems of insufficient cooling and localized overheating in certain areas found in existing technologies, thus improving the overall thermal stability of the module.

[0035] Furthermore, the housing 20 specifically includes an air inlet surface 23 and an air outlet surface 24 arranged opposite to each other. The air inlet 231 is disposed on the air inlet surface 23 to guide external cold air into the interior of the housing 20; the air outlet 241 is disposed on the air outlet surface 24 to discharge the hot air that has completed heat exchange, forming a complete airflow ventilation path to achieve air-cooling circulation.

[0036] During actual operation, when the cooling airflow enters through the air inlet 231, it first flows through the circulation channel 22 between adjacent battery cell groups 10, and during this process, it passes through the air duct 121 of the air guide plate 12 and exchanges heat with the surface of the battery cell 11. When the airflow reaches the end of the circulation channel 22, it directly impacts the air outlet 24, forming a local swirling turbulence zone. This turbulence disrupts the original orderly flow state, causing some airflow to deflect and flow back before heat exchange is completed, thereby interfering with the path of subsequent airflows and reducing the overall heat exchange efficiency.

[0037] To address the aforementioned issues, this embodiment incorporates a flow divider 30 within the housing 20. The flow divider 30 is positioned on the side of the air outlet 24 near the air inlet 23, specifically facing the flow channel 22 between adjacent cell groups 10. This means it is positioned at the path where the cooling airflow is about to reach the end of the channel, approaching the air outlet 24. The primary function of the flow divider 30 is to guide and regulate the airflow that would otherwise flow linearly along the thickness direction of the cell 11 (i.e., the first direction). Under the influence of the flow divider 30, the airflow does not directly impact the air outlet 24 before approaching it, preventing turbulence or backflow. Instead, it is effectively guided by the flow divider 30, deflecting the airflow to both sides along the second direction. The airflow is fully utilized at the end of the flow channel 22, continuing to pass through other areas of the cell groups 10 along the air duct 121 of the air guide plate 12, extending the cooling path, enhancing heat exchange with the cell 11, and significantly improving the overall heat exchange effect of the battery pack.

[0038] By setting the diverter 30, local airflow accumulation and turbulence can be avoided at the structural level, while the orderly guidance of the airflow path can be achieved, so that the airflow remains smooth and uniform during the process of entering, passing through and exiting the housing 20, ensuring that each area of ​​the battery cell 11 obtains a consistent cooling effect, and further improving the working stability and overall heat dissipation performance of the air-cooling system.

[0039] In some optimized embodiments, the housing 20 further includes a connecting surface 25 for connecting the air inlet surface 23 and the air outlet surface 24, so that the three are enclosed to form an integrally formed receiving cavity 21. The receiving cavity 21 is used to install multiple battery cell groups 10 and their air guiding structures, providing a controlled spatial boundary for the orderly flow of cooling airflow.

[0040] To further enhance the continuity of internal airflow, a guide member 40 is also provided in this embodiment. The guide member 40 is installed on the side of the connecting surface 25 near the receiving cavity 21 and is arranged towards the air duct 121 of the air guide plate 12 between the battery cells 10, specifically in front of the airflow direction of the air outlet of the air duct 121. The main function of the guide member 40 is to adjust the flow direction of the airflow that flows out from the second direction after passing through the air guide plate 12 air duct 121, guiding it to the first direction, so that the airflow can smoothly reach and exit the housing 20 through the air outlet 241 on the air outlet surface 24.

[0041] In this embodiment, without the guide member 40, the airflow exiting the duct 121 would directly impact the connecting surface 25 of the housing 20 upon contact, causing not only obstruction of the airflow path and a decrease in local velocity, but also turbulence and swirling zones, thus affecting the overall heat dissipation efficiency of the battery module. The guide member 40 ensures a smooth flow transition at the outlet of the duct 121 of the air guide plate 12, avoiding the turbulent effects caused by direct impact on the connecting surface 25. The guide member 40 can be configured as a curved surface, an inclined surface, or a guide vane structure according to the airflow path to further improve the guiding efficiency and reduce resistance loss.

[0042] In some embodiments, in order to improve the adaptability and maintainability of the air-cooled battery pack under different usage scenarios or cooling requirements, the connection surface 25 between the guide 40 and the housing 20 is set to be detachable, so that the guide 40 can be installed, replaced or maintained without replacing the entire housing 20.

[0043] Specifically, the guide component 40 can be mechanically connected to the connecting surface 25 through bolt connections, snap-fit ​​structures, guide rail grooves, plug-in fits, etc., ensuring both secure installation and easy quick assembly and disassembly. During the design or operation of the battery pack, depending on the configuration of different models and sizes of cell groups 10, or according to the optimization requirements for cooling airflow distribution under different operating conditions, users can select guide components 40 with different shapes, sizes, or guiding angles to adjust the airflow guiding angle, velocity distribution, or flow field structure, thereby achieving more precise cooling control.

[0044] For example, when the battery cells 11 are arranged densely and the spacing is small, curved guides 40 can be used to make the airflow transition more smoothly to the air outlet 241 and reduce local turbulence. At the same time, if a guide 40 is found to be damaged or affect the airflow efficiency during maintenance or inspection, it can be replaced individually without changing the entire housing 20 structure, thus reducing maintenance costs and downtime.

[0045] In some optimized embodiments, please refer to Figure 3 and Figure 4 , Figure 3 This is a partial schematic diagram of the battery cell assembly 10 provided in an embodiment of the present invention. Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A partial enlarged view of region A. Each air guide plate 12 is provided with multiple air ducts 121, and these air ducts 121 are not concentrated in one position, but are distributed at intervals on the air guide plate 12 along a third direction (i.e. the height direction of the battery cell 11).

[0046] The third direction is perpendicular to the thickness direction and the arrangement direction of the battery cell 11, that is, the direction from bottom to top of the battery cell 11. Multiple air ducts 121 are evenly or spaced out as needed in this direction, so that the airflow is no longer concentrated in a narrow area at a fixed height when passing through the air guide plate 12, but is dispersed along the entire height direction of the battery cell 11, effectively expanding the heat exchange area, so that the cooling airflow can exchange heat with multiple areas of the upper, middle and lower parts of the battery cell 11.

[0047] The multi-channel 121 distribution structure not only enhances airflow penetration but also helps form layered, distributed airflow channels, thereby reducing the phenomenon of excessively strong local airflow or insufficient airflow in other areas caused by a single channel 121. Through interval arrangement, the airflow density at different heights can be further controlled to achieve targeted enhancement of the cooling effect in a specific heat-sensitive area.

[0048] In addition, the spacing, width, and quantity of the air ducts 121 can also be customized and optimized according to the thermal characteristics of different battery cell groups 10. For example, in an application scenario where the temperature rise in the middle of the battery cells 11 is significantly higher than that at the upper and lower ends, the layout of the air ducts 121 in the middle area can be appropriately densified to increase the air flow through this area and enhance the cooling effect in the key area.

[0049] Furthermore, in some optimization embodiments, the structural dimensions of the air ducts 121 in the air guiding plate 12 are defined. While ensuring the cooling effect, the structural strength is also taken into account. Specifically, the wall thickness of the air duct 121 in the first direction (i.e., the thickness direction of the battery cell 11) is S, and the overall width of the air guiding plate 12 in the same direction is W. The relationship between the two satisfies the following range: W / 7 < S < W / 5.

[0050] If the wall thickness S of the air duct 121 is too small relative to the width W of the air guiding plate 12 (i.e., S < W / 7), the structural strength of the air guiding plate 12 will be significantly affected, and it is likely to deform or be damaged during assembly or operation. Especially when the number of air ducts 121 is large and the intervals are dense, it is more likely to cause local instability of the plate body, thereby affecting the stability of the air flow direction, and even imposing additional interference on the battery cell 11, reducing the system reliability.

[0051] If the wall thickness S of the air duct 121 is too large (i.e., S > W / 5), although it can enhance the strength of the air guiding plate 12, it will significantly compress the effective flow area between the air ducts 121, increase the air flow resistance, reduce the efficiency of the air flow passing through the air guiding plate 12, and ultimately affect the flow rate and velocity of the cooling air flow, resulting in a decrease in the heat exchange efficiency. In addition, the air flow distribution between the air ducts 121 may also become uneven due to the overly thick wall body, resulting in problems such as air volume deviation and local insufficient cooling.

[0052] By controlling the wall thickness S of the air duct 121 within the reasonable range between W / 7 and W / 5, not only can the air guiding plate 12 be ensured to have sufficient structural stability and mechanical strength, but also the air duct 121 can be guaranteed to have sufficient flow cross-sectional area, enabling the air flow to pass smoothly and forming a uniform and stable cooling flow field to achieve efficient heat dissipation between the battery cells 11. In addition, this proportional relationship also has good processing technology compatibility. In actual production, the wall thickness of the air duct 121 within this range is easy to achieve through conventional injection molding, stamping, or forming processes.

[0053] Considering the heat transfer uniformity of the cooling air flow when flowing in the air guiding plate 12, in some embodiments, the layout method of the air ducts 121 is further optimized. The wall thickness S of the air duct 121 in the first direction (i.e., the thickness direction of the battery cell 11) is set to be equal to the spacing D between two adjacent air ducts 121 in the third direction (i.e., the height direction of the battery cell 11), that is: S = D.

[0054] This structure aims to form an array of equally spaced and equally thick air ducts 121 on the air guide plate 12, so that the cooling airflow has a high degree of symmetry and uniform flow distribution in the height direction of the air guide plate 12. This helps to achieve uniform distribution of cooling airflow in actual operation, thereby improving the overall heat exchange consistency of the battery cell 11.

[0055] If the spacing of the air ducts 121 is much larger than the wall thickness, a portion of the air guide plate 12 in the height direction will be a heat exchange blind zone, resulting in incomplete airflow coverage and poor cooling effect. If the spacing of the air ducts 121 is much smaller than the wall thickness, the air duct 121 structure will be unstable in the height direction. Setting the wall thickness and spacing of the air ducts 121 to be equal allows the airflow to be distributed regularly in the height direction, thereby achieving a more stable and wider-coverage cooling effect within the height range of the battery cell 11. At the same time, the equal wall thickness design can also balance the stress on the air guide plate 12, improve its bending and deformation resistance, and further ensure the long-term operational reliability of the cooling system.

[0056] In some embodiments, microstructures 122 are further provided inside the air duct 121. These microstructures 122 are distributed along the inner wall of the air duct 121, and are designed to significantly improve heat transfer performance by increasing the contact area between the airflow and the wall of the air duct 121 and enhancing the airflow turbulence effect. The microstructures 122 may include, but are not limited to, the following forms:

[0057] Protruding structures: Regular or irregular small protrusions, such as dome-shaped, conical, or strip-shaped protrusions, are formed on the inner wall surface of the air duct 121. These protruding structures can break the boundary layer formed by the airflow near the wall without significantly increasing the resistance of the air duct 121, causing the airflow to adhere closely to the wall and form local disturbances, thereby improving the convective heat transfer efficiency between the airflow and the wall.

[0058] Fin structure: Multiple tiny fins are arranged on one or more sides of the inner wall of the air duct 121. The fins can be arranged in a plate-like structure perpendicular to the wall or be guide vanes at an inclined angle. This type of structure increases the heat exchange area and guides the airflow to generate vortices, tangential flow or turbulence within the air duct 121, further enhancing the airflow disturbance effect and improving the heat exchange rate.

[0059] Texture structure: Regular or random grooves, corrugations, grids, or other surface texture structures are formed on the inner wall of the air duct 121. This type of structure can increase the contact length between the airflow and the wall surface, increase the local pressure gradient, enhance the degree of airflow disturbance, and form a more complex flow path, thereby improving the uniformity and efficiency of heat exchange.

[0060] By incorporating the aforementioned microstructure 122 within the air duct 121, the heat exchange surface area can be significantly increased, and the laminar flow state can be effectively broken, promoting the airflow towards turbulence. This allows for more efficient energy transfer of the cooling airflow within the air duct 121. Especially under conditions where the width of the air duct 121 or the airflow velocity is limited, the presence of the microstructure 122 can effectively compensate for the shortcomings of conventional heat exchange paths, achieving superior cooling performance.

[0061] Furthermore, the cross-sectional shape of the air duct 121 can be selected from at least one of square, circular and triangular shapes. Different cross-sectional shapes have their own advantages in terms of airflow characteristics, heat exchange effect and structural strength, and can be flexibly selected according to specific application scenarios.

[0062] The square air duct 121 has advantages such as compact structure, high arrangement density, and convenient processing. Because its top and bottom are planar, it is easy to integrally form with the air guide plate 12, making it particularly suitable for battery cell 11 arrangement structures with high space utilization requirements. At the same time, the airflow distribution inside the square air duct 121 is relatively uniform, which is beneficial for achieving a larger cross-sectional heat exchange area, making it suitable for heat dissipation applications requiring forced convection.

[0063] The circular air duct 121 exhibits excellent hydrodynamic performance, with lower flow resistance and better airflow. Its natural symmetry helps the airflow form a uniform flow field around the duct wall, reducing drag losses caused by turbulence and improving cooling efficiency. In addition, the circular cross-section provides higher structural stability under pressure, making it suitable for applications requiring high reliability or pressure resistance.

[0064] The triangular air duct 121 features a unique streamlined structure that can induce airflow turbulence to a certain extent, breaking the boundary layer and enhancing heat transfer. Its acute angle or bevel design also facilitates airflow guidance, providing more freedom in structural design, and is especially suitable for cooling systems with special requirements for airflow angle or guidance within limited spaces.

[0065] In practical applications, the cross-sectional shape of the air duct 121 can not only adopt any of the above forms individually, but also combine multiple shapes for a mixed design to meet the space constraints, cooling requirements, or airflow guidance strategies in a specific area. For example, a circular cross-section can be used in the area near the air inlet 231 to reduce inlet resistance, a square cross-section can be used in the area near the battery cell 11 to increase the contact area, and a triangular air duct 121 can be set in the flow turning area to guide the airflow direction.

[0066] In some embodiments, please refer to Figure 5 , Figure 5This is a schematic diagram of the air inlet surface 23 of the air-cooled battery pack provided in this embodiment of the utility model. The air-cooled battery pack also includes a fan 50. The fan 50 can be flexibly configured at the air inlet 231 and / or air outlet 241 of the housing 20 according to specific application requirements, to drive forced airflow, construct a stable and efficient airflow circulation channel, thereby significantly improving the cooling performance of the entire battery pack.

[0067] When fan 50 is positioned at air inlet 231, it actively draws external cool air into the circulation channel 22 and air duct 121 of the battery pack's internal airflow. This positive pressure airflow effectively reduces airflow deceleration due to resistance as it enters the module. When fan 50 is positioned at air outlet 241, it acts as a suction unit, rapidly expelling the heated air from the casing 20, creating negative pressure to guide a continuous flow of fresh air into the battery pack. In some optimized designs, fan 50 can be simultaneously positioned at both air inlet 231 and air outlet 241, forming a "dual-fan 50" structure to further enhance airflow drive capability and achieve more efficient cooling circulation.

[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 inventive 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. An air-cooled battery pack, characterized by, include: A battery cell assembly includes multiple battery cells and a guide plate. The multiple battery cells are arranged along a first direction. The guide plate is disposed between adjacent battery cells and connects adjacent battery cells. The guide plate has an air duct along a second direction, and the air duct passes through the guide plate. The housing has a receiving cavity in which at least two battery cell groups are arranged side by side along the second direction, and a flow channel is formed between adjacent battery cell groups. The housing has an air inlet and an air outlet on both sides along the first direction, with the air inlet facing the flow channel and the air outlet located at both ends along the second direction. Wherein, the first direction is the thickness direction of the battery cell, and the second direction is perpendicular to the first direction.

2. The air-cooled battery pack of claim 1, wherein, The housing includes an air inlet surface and an air outlet surface arranged opposite to each other, with the air inlet located on the air inlet surface and the air outlet located on the air outlet surface; The air-cooled battery pack also includes a diverter, which is disposed on the side of the air outlet surface close to the air inlet surface and faces the flow channel. The diverter is used to divert airflow from the first direction to both sides of the second direction.

3. The air-cooled battery pack of claim 2, wherein, The housing also includes a connecting surface, which connects the air inlet surface and the air outlet surface, and the connecting surface, the air inlet surface and the air outlet surface together form the receiving cavity; The air-cooled battery pack also includes a guide member disposed on the side of the connecting surface near the receiving cavity, and the guide member facing the air duct, for guiding airflow from the air duct to the air outlet.

4. The air-cooled battery pack of claim 3, wherein, The guide is detachably connected to the connecting surface.

5. The air-cooled battery pack of claim 1, wherein, The number of air ducts is multiple, and the multiple air ducts are distributed at intervals along a third direction on the air guide plate, wherein the third direction is the height direction of the battery cell.

6. The air-cooled battery pack of claim 5, wherein, The wall thickness S of the air duct in the first direction and the width W of the air guide plate satisfy: W / 7 <S<W / 5。 7. The air-cooled battery pack of claim 5, wherein, The wall thickness S of the air duct in the first direction is equal to the distance D between adjacent air ducts in the third direction.

8. The air-cooled battery pack of any one of claims 1 to 7, wherein, The air duct also includes microstructures disposed on the inner wall of the air duct to increase the airflow contact area. The microstructures include protrusion structures, fin structures, or textured structures.

9. A wind-cooled battery pack according to any one of claims 1 to 7, characterized in that, The cross-sectional shape of the air duct is selected from at least one of square, circular and triangular.

10. A wind-cooled battery pack according to any one of claims 1 to 7, characterized in that, The air-cooled battery pack also includes a fan, which is disposed at the air inlet and / or the air outlet to improve airflow efficiency.

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