Air-cooled battery pack

Abstract

The utility model relates to the technical field of air cooling, and discloses an air-cooled battery pack which comprises a box body, a battery cell module and a built-in air duct, a cavity is formed in the box body, and a plurality of air inlets and at least one air outlet are formed in the side surface of the box body; a plurality of groups of battery cell modules are arranged in the box body at intervals; the built-in air duct is arranged in the cavity and provided with a first end and a second end which are oppositely arranged, the first end is provided with an inlet end, the inlet end is communicated with one air inlet of the box body, the second end is closed, the built-in air duct extends from the air inlet to the air outlet, and a gap is formed between the second end and the air outlet; a plurality of inner air outlets are formed in the side face of the built-in air duct. The built-in air duct is arranged, and the inlet end of the first end of the built-in air duct is communicated with one air inlet of the box body and extends towards the air outlet, so that external cold air can be guided to the central area of the box body to directly dissipate heat of the battery cell module in the central area, and the problem that heat of the central battery cell in the high-capacity battery pack is difficult to dissipate is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an air-cooled battery pack. Background Technology

[0002] Currently, the capacity of air-cooled battery packs is getting larger and larger, and the battery packs are also getting bigger and bigger. The heat of the central cells inside the battery pack is difficult to dissipate, the internal temperature rises, and the temperature difference of the entire battery pack is too large. Utility Model Content

[0003] In view of this, the present invention provides an air-cooled battery pack, which aims to effectively solve the problem of heat dissipation from the central cells inside a large-capacity battery pack.

[0004] This utility model provides an air-cooled battery pack, including a housing, battery cell modules, and an internal air duct. The housing has an internal cavity, and the side of the housing is provided with multiple air inlets and at least one air outlet. The battery cell modules are arranged in multiple sets at intervals within the housing. The internal air duct is disposed within the cavity and has a first end and a second end arranged opposite to each other. The first end has an inlet end that communicates with an air inlet of the housing, and the second end is closed. The internal air duct extends from the air inlet end toward the air outlet end, and there is a gap between the second end end and the air outlet end. The side of the internal air duct is provided with multiple internal air outlets.

[0005] By designing a cavity-like enclosure with multiple air inlets and at least one air outlet on its side, a basic heat dissipation structure framework is constructed for the air-cooled battery pack. This allows outside cold air to enter the enclosure through multiple air inlets, absorb heat, and then exit through the air outlet, forming a basic heat dissipation path and initially ensuring the feasibility of heat dissipation. By arranging multiple sets of battery cell modules at intervals within the enclosure, the battery pack's cell capacity is increased to meet high-capacity requirements. Simultaneously, the multiple, spaced-out arrangement helps to disperse heat sources and prevent excessive heat concentration. An internal air duct with an inlet at one end is placed within the cavity, with its inlet connected to one of the enclosure's air inlets and facing... Extending towards the air outlet, outside cold air is guided to the central area of ​​the enclosure, directly dissipating heat from the central battery cell modules. This directional airflow effectively solves the problem of heat dissipation from the central battery cells in large-capacity battery packs, reducing the risk of excessive temperature differences across the entire pack. Multiple internal air outlets on the sides of the built-in air duct ensure that incoming cold air is evenly blown out from multiple directions, increasing the contact area between the cold air and components such as the battery cell modules. This increased heat exchange area improves heat dissipation efficiency, enhancing the overall heat dissipation performance of the air-cooled battery pack and ensuring stable operation and good thermal performance under various operating conditions. By sealing the second end of the built-in air duct and creating a gap between it and the enclosure's air outlet, effective airflow control within the air-cooled battery pack is achieved, further improving heat dissipation performance. By sealing the second end of the built-in air duct, the cold air entering the duct can be guided to blow out directionally from the side air outlet, directly acting on the battery cell module. By restricting the airflow direction, the blowing effect of the cold air on the battery cell module is enhanced, improving heat exchange efficiency. The second end of the built-in air duct is spaced apart from the air outlet of the casing, forming a specific airflow channel layout. This allows the hot air that has absorbed heat from the battery cell module to flow orderly towards the air outlet within the casing, avoiding disordered mixing and short-circuiting of hot and cold air. By optimizing the airflow path, the stability and continuity of the heat dissipation process are ensured, which is more conducive to carrying heat out of the casing. This effectively solves the problem of insufficient heat dissipation of the battery cells inside the large-capacity battery pack, reduces the temperature difference of the entire pack, and ensures that the air-cooled battery pack can maintain good heat dissipation and stable operation under different working conditions, extending the service life of the battery pack and improving its reliability.

[0006] Optionally, the built-in air duct is a rectangular column, and the internal air outlet is located on both sides of the built-in air duct.

[0007] By designing the internal air duct as a rectangular column and placing the internal air outlets on both sides of the internal air duct, several positive technical effects are achieved. Designing the internal air duct as a rectangular column makes its layout within the enclosure more regular and better adaptable to the space. Optimizing the air duct shape facilitates its spatial arrangement with other components such as battery modules, reducing space waste or interference caused by irregular shapes and promoting a more compact overall structure. Placing the internal air outlets on both sides allows the cool air blown from the internal air duct to act more directly on the battery modules from both sides. Compared to other dispersed or unidirectional air outlet arrangements, this side-distribution method covers a wider area of ​​the battery modules. The rational layout of the air outlets increases the contact range between the cool air and the battery modules, improving heat exchange efficiency and making heat dissipation more uniform. This effectively improves the insufficient heat dissipation of the battery cells inside large-capacity battery packs, thereby reducing the overall temperature difference of the battery pack, ensuring stable operation of the battery pack in a favorable temperature environment, and enhancing the heat dissipation effect of the air-cooled battery pack.

[0008] Optionally, the internal air outlet is a vertically arranged strip-shaped opening.

[0009] By designing the internal air outlet as a vertically oriented strip, a significant improvement in heat dissipation is achieved. This vertical strip design allows cool air to be blown out in a more concentrated and directional airflow. This optimized airflow pattern enhances the blowing force on the battery cell modules, enabling the cool air to penetrate deeper into all parts of the modules and make full contact with the cells, effectively improving heat exchange efficiency. This strip shape and vertical orientation are compatible with the common layout of battery cell modules. Whether it's the arrangement of multiple battery cell modules within the casing or the shape and orientation of the cells themselves, it allows the cool air to flow better along the cell surface. By adapting to the cell layout, the heat exchange area is further expanded, allowing heat to be carried away more quickly. This improves the insufficient heat dissipation of cells inside large-capacity battery packs, reduces the risk of overheating due to poor cell cooling, minimizes the overall temperature difference of the pack, ensures the stability and reliability of the air-cooled battery pack during operation, and improves overall heat dissipation performance.

[0010] Optionally, the multiple internal air outlets are spaced apart along the extension direction of the built-in air duct, and the multiple internal air outlets are arranged on the built-in air duct in a pattern of larger air outlets in the middle and smaller air outlets at both ends.

[0011] By strategically placing internal air outlets at intervals, the cool air blown from the internal air duct is evenly distributed along its path, preventing localized over- or under-airflow. This even distribution ensures adequate cooling for all battery cell modules, improving heat dissipation uniformity. The arrangement of larger central vents and smaller end vents is because the central area of ​​the internal air duct is closer to the center of the enclosure, where heat dissipation is more challenging. Larger central vents provide greater airflow, enhancing heat dissipation for the central cells. Smaller end vents, closer to the side air inlets and other better-vented areas, are sufficient to meet the cooling needs of the surrounding battery cell modules. This rational allocation of vent sizes optimizes airflow utilization, precisely meeting the heat dissipation requirements of battery cell modules in different locations. It effectively addresses the issue of insufficient heat dissipation within large-capacity battery packs, reducing overall temperature differences and ensuring good heat dissipation and stable performance under various operating conditions.

[0012] Optionally, multiple sets of the battery cell modules are symmetrically arranged on both sides of the built-in air duct.

[0013] The symmetrical layout ensures that the cool air blown out by the built-in air ducts can be evenly distributed to the battery cell modules on both sides. This optimized symmetrical layout ensures that each battery cell module receives a relatively balanced amount of cooling during the heat dissipation process, avoiding uneven heat dissipation caused by differences in position and effectively improving the uniformity of heat dissipation. This symmetrical arrangement also contributes to the balance and stability of the overall structure within the enclosure. During assembly, the symmetrical structure facilitates the installation and connection of various components, reducing stress concentration or spatial interference problems caused by unreasonable layout. By simplifying the assembly process, it improves production efficiency and product reliability. At the same time, multiple symmetrically arranged battery cell modules increase the capacity and energy density of the battery pack. Through reasonable arrangement of the battery cell modules, while ensuring good heat dissipation, it better meets the energy storage requirements of large-capacity battery packs, enabling the air-cooled battery pack to operate stably and maintain good performance under different operating conditions. This effectively solves the negative impact of insufficient heat dissipation and unreasonable layout on battery pack performance.

[0014] Optionally, the housing is rectangular, and a first air inlet is provided on the back of the housing, with the inlet end of the built-in air duct connected to the first air inlet.

[0015] The rectangular enclosure design provides a regular and stable space for internal battery cell modules, built-in air ducts, and other components. Optimizing the enclosure shape facilitates the rational layout and installation of various components, reducing component compatibility issues caused by irregular spaces and improving assembly efficiency and overall structural stability. The first air inlet is located on the back of the enclosure and connected to the inlet of the built-in air duct, allowing external cold air to enter the duct from a specific direction in an orderly manner. Precisely guiding the cold air provides an efficient path for it to enter the central area of ​​the enclosure, enhancing the targeted heat dissipation of the central battery cell modules. This effectively improves the situation where heat is difficult to dissipate from the central cells inside the large-capacity battery pack, reducing temperature rises and excessive temperature differences throughout the pack caused by insufficient heat dissipation. This ensures the thermal stability of the air-cooled battery pack during operation, improves the overall heat dissipation effect, and enables the battery pack to operate stably and maintain good performance under different operating conditions.

[0016] Optionally, the two sides of the housing are respectively provided with a second air inlet, and a plurality of second air inlets are spaced apart along the extension direction of the side of the housing, and the plurality of second air inlets are arranged on the side of the housing in a pattern of larger air inlet in the middle and smaller air inlet at both ends.

[0017] By setting second air inlets on both sides of the enclosure, the path and flow of cold air into the enclosure are increased. By widening the air intake channel, more cold air can enter the enclosure, enhancing the overall heat dissipation capacity. The multiple second air inlets are spaced apart, allowing cold air to be more evenly distributed on both sides of the enclosure, ensuring full contact with the battery cell modules. The even distribution of air intake improves the uniformity of heat dissipation. The arrangement of the air inlets in the middle with larger ones at both ends is because the battery cell modules in the middle area of ​​the enclosure are more prone to heat accumulation and are more difficult to dissipate. The larger central air inlet can provide more sufficient cold air, while the smaller air inlets at both ends, which are closer to other heat dissipation structures or edges, can also meet the heat dissipation needs. By rationally allocating the size of the air inlets, the utilization efficiency of cold air is optimized, and the heat dissipation requirements of battery cell modules in different locations are more accurately met. This effectively solves the problem of insufficient heat dissipation of battery cells inside large-capacity battery packs, reduces the temperature difference of the entire pack, and ensures that the air-cooled battery pack maintains good heat dissipation and stable performance under different operating conditions.

[0018] Optionally, an air suction device is provided at the air outlet of the housing.

[0019] By generating suction at the air outlet through the suction device, the speed at which hot air is expelled from the enclosure is accelerated. By enhancing the exhaust power, the hot air that has absorbed heat around the battery cell module can be drawn out of the enclosure more quickly, preventing hot air from accumulating inside and ensuring efficient heat dissipation. At the same time, this suction effect can work in conjunction with the entry of cold air at the air inlet to create a stronger and more orderly airflow circulation within the enclosure. Cold air can enter more smoothly from the air inlet, exchange heat with the battery cell module, and then be quickly guided by the suction device to be expelled from the air outlet. By optimizing the airflow circulation, the heat dissipation effect on the battery cell module is further improved, effectively solving the problem of insufficient heat dissipation of the battery cells inside large-capacity battery packs, reducing the temperature difference of the entire pack, and allowing the air-cooled battery pack to maintain good thermal stability under different operating conditions, ensuring reliable and stable operation of the battery pack and extending its service life.

[0020] Optionally, the box is a rectangular box with its largest surface horizontal; the box has a top cover that can be detachably covering the largest surface of the box.

[0021] By horizontally positioning the largest surface of the rectangular enclosure, the enclosure offers enhanced stability during placement, providing a stable mounting base for the internal cell modules and other components. Optimizing enclosure stability reduces the impact of shaking or tilting on the internal structure, ensuring the normal operation of the battery pack. The horizontal orientation also facilitates proper connection between the air inlet and outlet and the external environment, allowing for smooth airflow and improved heat dissipation efficiency. The removable top cover facilitates battery pack assembly and maintenance. During assembly, cell modules, internal air ducts, and other components can be easily installed into the enclosure, simplifying the assembly process and improving production efficiency. During maintenance, the top cover can be quickly opened for internal inspection, repair, or component replacement, simplifying later maintenance, reducing maintenance costs and difficulty, and ensuring stable and reliable operation and maintaining good performance of the air-cooled battery pack under various operating conditions. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an exploded view of the internal structure of a cooling battery pack according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 The diagram shows the internal structure of the box.

[0025] Figure 3 for Figure 1 The diagram shows the back of the box.

[0026] Figure 4 for Figure 1 The diagram shown is a side view of the box.

[0027] Figure 5 for Figure 1 The diagram shown is a front view of the box.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Housing; 2. Cavity; 3. Air inlet; 4. Air outlet; 5. Battery cell module; 6. Internal air duct; 7. Inlet end; 8. Internal air outlet; 9. First air inlet; 10. Second air inlet; 11. Second end; 12. Suction device; 13. Top cover. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the field of air-cooling technology, the capacity and volume of air-cooled battery packs are constantly increasing. This makes it difficult to dissipate heat from the central cells inside the battery pack, causing the internal temperature to gradually rise and resulting in excessive temperature differences throughout the battery pack. To address the issue of insufficient heat dissipation and poor heat dissipation effect of the internal cells in large-capacity battery packs, this embodiment proposes an air-cooled battery pack.

[0032] like Figure 1 and Figure 2 As shown, the air-cooled battery pack provided in this embodiment mainly includes a housing 1, a cell module 5, and a built-in air duct 6.

[0033] Specifically, the housing 1 has a cavity 2 inside, with multiple air inlets 3 and at least one air outlet 4 on its side. Multiple battery cell modules 5 are spaced apart within the housing 1. An internal air duct 6 has a first end and a second end 11 arranged opposite to each other. The first end is an inlet end 7, which is placed inside the cavity 2 and connected to one of the air inlets 3 of the housing 1. The second end 11 is closed. The internal air duct 6 extends from the air inlet 3 towards the air outlet 4, with a gap between the second end 11 and the air outlet 4. Multiple internal air outlets 8 are also provided on the side of the internal air duct 6.

[0034] In this embodiment, the overall structure of the air-cooled battery pack, the state of the second end 11 of the built-in air duct 6, and its relative positional relationship with the air outlet 4 of the housing 1 are defined.

[0035] Specifically, by setting up a housing 1 with a cavity 2 and equipping it with multiple air inlets 3 and air outlets 4 on the side, a basic channel for heat exchange between the air-cooled battery pack and the outside environment is constructed. Cold air from the outside can enter the housing 1 through the multiple air inlets 3. After absorbing the heat generated by components such as the cell modules 5, the hot air is discharged from the air outlets 4, forming a basic heat dissipation channel. This initially ensures the feasibility of heat dissipation for the battery pack, allowing heat to circulate and transfer inside and outside the housing 1, preventing excessive heat accumulation inside the housing 1. Multiple sets of spaced cell modules 5 are distributed within the housing 1, which not only increases the cell capacity of the battery pack to meet the demand for large capacity, but also disperses the heat source. Compared with a single set or centralized cell layout, this is more conducive to the uniform dissipation of heat, avoids excessive local heat, reduces the risk of cell overheating caused by heat concentration, and lays the foundation for the effective implementation of subsequent heat dissipation measures. One end of the built-in air duct 6 has an inlet end 7, which connects to the air inlet 3 of the housing 1 and extends towards the air outlet 4. This guides incoming cold air into the housing 1, effectively solving the problem of heat dissipation from the central cells inside the large-capacity battery pack, reducing the risk of excessive temperature differences throughout the pack, and improving the uniformity and effectiveness of heat dissipation within the battery pack. Multiple internal air outlets 8 are provided on the side of the built-in air duct 6, allowing the cold air entering the duct to be blown out evenly from multiple directions. This increases the contact points and contact area between the cold air and components such as the cell module 5, making the cold air more widely and evenly distributed within the housing 1. By increasing the heat exchange area and optimizing the cold air distribution, heat dissipation efficiency is improved, allowing the cell module 5 to exchange heat more fully with the cold air, thereby removing more heat and ensuring stable operation and good thermal performance of the battery pack under different operating conditions. Furthermore, those skilled in the art will understand that, in terms of directional airflow guidance, the closed second end 11 of the built-in air duct 6 effectively guides the cold air entering the duct 6 to be blown out directionally from the side internal air outlets 8. When cold air flows within the air duct, it cannot escape from the closed second end 11 and can only flow towards the cell module 5 through the side inner air outlet 8. By restricting the airflow direction, the blowing effect of cold air on the cell module 5 is significantly enhanced, allowing the cold air to reach the surface of the cell module 5 more precisely, thereby improving heat exchange efficiency. This effectively ensures that the cell module 5 can fully exchange heat with the cold air, effectively improving the insufficient heat dissipation of the cells inside the large-capacity battery pack, reducing the risk of excessive cell temperature caused by poor heat dissipation, and ensuring stable operation of the battery pack under different operating conditions and maintaining good thermal performance. In terms of optimizing airflow circulation, the second end 11 of the built-in air duct 6 is spaced from the air outlet 4 of the housing 1, cleverly constructing a specific airflow channel layout. When cold air is blown out from the inner air outlet 8 and absorbs heat from the cell module 5 to become hot air, the hot air will flow towards the air outlet 4 within the housing 1 along a specific path. This spacing effectively avoids the disorderly mixing and short-circuiting of hot and cold air, allowing hot air to converge orderly towards the air outlet 4 and be discharged from the housing 1.By optimizing the airflow path, the stability and continuity of the heat dissipation process are effectively guaranteed, which is more conducive to carrying heat out of the housing 1, reducing the accumulation of heat in the housing 1, effectively solving the problem of insufficient heat dissipation of the cells inside the large-capacity battery pack, reducing the temperature difference of the whole pack, ensuring that the air-cooled battery pack can maintain good heat dissipation and stable operation under different working conditions, extending the service life of the battery pack and improving its reliability.

[0036] It should be noted that this embodiment does not limit the shape of the built-in air duct 6 or the position of the internal air outlet 8, nor does it limit the shape of the internal air outlet 8, the arrangement of the internal air outlet 8, the relative positional relationship between the cell module 5 and the built-in air duct 6, the shape of the housing 1 and the setting position and connection relationship of the first air inlet 9, the situation of the second air inlets 10 on both sides of the housing 1, the device at the air outlet 4 of the housing 1, the overall shape structure of the housing 1, or the setting of the top cover 13. This is because by coordinating the housing 1, the cell module 5, and the built-in air duct 6, an effective heat dissipation system can be constructed, which can solve the problem of insufficient heat dissipation and poor heat dissipation effect of the cells inside the large-capacity battery pack, and meet the needs of diverse application scenarios.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments, the built-in air duct 6 is a rectangular column, and the internal air outlet 8 is located on both sides of the rectangular column air duct.

[0038] Specifically, in this embodiment, regarding optimizing the adaptability of the internal structure, the built-in air duct 6 is designed as a rectangular column, which better adapts to the shape of the internal cavity of the housing 1. Within the cuboid housing 1, the rectangular column air duct allows for a more regular layout. Compared to irregularly shaped air ducts, it utilizes space more effectively, reducing space waste caused by shape differences or interference with components such as the cell module 5 and wiring. By optimizing the built-in air duct 6 and adapting it to the shape of the internal cavity of the housing 1, the space utilization rate within the housing 1 is improved, facilitating the rational installation and layout of various components and enhancing the compactness and stability of the internal structure of the air-cooled battery pack. Regarding enhancing the targeted heat dissipation, the internal air outlets 8 are positioned on both sides of the built-in air duct 6, causing the blown-out cold air to primarily flow to both sides. This layout aligns with the structure of multiple cell modules 5 symmetrically placed on both sides of the built-in air duct 6. After the cold air is blown out from the internal air outlets 8 on both sides, it can act more directly and precisely on the cell module 5. Compared to other locations or all-around placement of internal air outlets 8, the side air outlets can create a more concentrated and effective heat dissipation airflow path without causing airflow turbulence. By precisely guiding the flow of cold air, the contact opportunities and duration between cold air and the cell module 5 are increased, allowing heat to be transferred from the cell module 5 to the cold air more efficiently, improving heat dissipation efficiency, effectively improving the situation of insufficient heat dissipation of cells inside large-capacity battery packs, thereby reducing the temperature difference of the entire battery pack, ensuring stable operation of the battery pack under different operating conditions and maintaining good thermal performance.

[0039] The shape of the internal air outlet 8 of the built-in air duct 6 in this embodiment is described in detail below.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the internal air outlet 8 of the built-in air duct 6 is a vertically arranged strip-shaped opening.

[0041] In this embodiment, those skilled in the art will understand that, in terms of optimizing airflow pattern, the internal air outlet 8 is designed as a vertically arranged strip-shaped opening, allowing the cold air to form a specific airflow pattern when it is blown out. This vertical strip-shaped opening makes the direction of cold air blowing more concentrated and has a clear directionality. Compared with the circular or irregularly shaped air outlet 4, its airflow is less likely to disperse and can maintain a good airflow pattern and velocity. Through this optimization, the blowing force and precision on the battery cell module 5 are enhanced, and the cold air can penetrate more deeply and effectively into all parts of the battery cell module 5, increasing the contact opportunities with the battery cell surface, thereby improving heat exchange efficiency. In terms of adapting to the battery cell structure, the shape of the vertical strip-shaped opening is compatible with the common layout structure of the battery cell module 5 and the shape characteristics of the battery cell itself. Multiple sets of battery cell modules 5 have a specific arrangement direction and height distribution in the housing 1, and the shape of the battery cells is also relatively regular. The airflow blown out by this strip-shaped opening can flow smoothly along the height direction and arrangement direction of the battery cells, closely adhering to the surface of the battery cells, making full use of the spatial layout characteristics of the battery cell module 5. By adapting the cell layout, the heat exchange area is further expanded, enabling heat to be carried away by the cold air more quickly and comprehensively. This effectively improves the insufficient heat dissipation of cells inside the large-capacity battery pack, reduces the risk of excessively high cell temperatures due to poor heat dissipation, reduces the overall temperature difference of the pack, ensures the operational stability and reliability of the air-cooled battery pack, and improves the overall heat dissipation performance.

[0042] The arrangement of the internal air outlets 8 in this embodiment will be described in detail below.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, multiple internal air outlets 8 are spaced apart along the extension direction of the built-in air duct 6, and these internal air outlets 8 are arranged on the air duct in a pattern of larger air outlets in the middle and smaller air outlets at both ends.

[0044] In this embodiment, those skilled in the art will understand that, in terms of improving heat dissipation uniformity, multiple internal air outlets 8 are spaced apart along the extension direction of the built-in air duct 6, so that when cold air is blown out from each internal air outlet 8, it can be evenly distributed along the extension path of the air duct. This spaced arrangement effectively prevents uneven local airflow, allowing the cell modules 5 on both sides of the built-in air duct 6 to receive a relatively balanced supply of cold air. By evenly distributing the cold air, the heat dissipation uniformity is significantly improved, ensuring that the cell modules 5 in each position operate in a suitable temperature environment, reducing the phenomenon of local overheating or overcooling of cell modules caused by uneven heat dissipation, thereby enhancing the stability and reliability of the entire cell module 5 and extending the service life of the battery pack. In terms of optimizing the air outlet configuration, based on the internal heat distribution characteristics and heat dissipation requirements of the battery pack, the internal air outlets 8 are arranged according to the rule that the air outlets in the middle are larger and the air outlets at both ends are smaller. Since the middle position of the built-in air duct 6 is closer to the central area of ​​the housing 1, the cell modules 5 here are farther from the heat dissipation points such as the side air inlets 3 of the housing 1, and the surrounding cell modules 5 are densely packed, resulting in more severe heat accumulation and greater difficulty in heat dissipation. Larger central vents provide greater airflow, enhancing heat dissipation for the central battery cells and accelerating heat dissipation. Meanwhile, smaller vents are sufficient to meet the cooling needs of the well-ventilated areas near the side air inlets 3 of the casing 1, where there are fewer surrounding battery cell modules 5. By rationally adjusting the vent sizes, the efficiency of cold air utilization is optimized, precisely matching the heat dissipation requirements of battery cell modules 5 in different locations. This solves the problem of insufficient heat dissipation for the internal cells of large-capacity battery packs, reduces the overall temperature difference of the pack, and ensures that the air-cooled battery pack maintains excellent heat dissipation and stable performance under various operating conditions.

[0045] The relative positional relationship between the battery cell module 5 and the built-in air duct 6 in this embodiment will be described in detail below.

[0046] like Figure 1 and Figure 2 As shown, in some embodiments, multiple sets of battery cell modules 5 are symmetrically arranged on both sides of the built-in air duct 6.

[0047] In this embodiment, those skilled in the art will understand that, to ensure uniform heat dissipation, multiple sets of battery cell modules 5 are symmetrically placed on both sides of the built-in air duct 6, so that the cold air blown out of the built-in air duct 6 can act evenly on the battery cell modules 5 on both sides. When cold air is blown out from the air outlets 8 on both sides of the built-in air duct 6, the symmetrically arranged battery cell modules 5 can obtain a relatively balanced amount of cooling, effectively avoiding uneven heat dissipation caused by positional differences. With the optimization of symmetrical layout, it is effectively ensured that the amount of cooling obtained by each battery cell module 5 is relatively balanced during the heat dissipation process, which greatly improves the uniformity of heat dissipation and makes the temperature distribution of the battery cells in the entire battery pack more uniform, thereby reducing the adverse effects of local overheating or overcooling on the performance and lifespan of the battery cells. In terms of improving structural stability, this symmetrical arrangement is beneficial to the balance and stability of the overall structure inside the housing 1. In the assembly process, the symmetrical structure facilitates the installation and connection of various components, which can reduce stress concentration or spatial interference problems caused by improper layout. For example, when connecting cell modules 5 to components such as wiring and sensors, the symmetrical layout makes the wiring more organized, reduces wiring tangling, and improves assembly efficiency and connection reliability. It also facilitates the fixing and support of cell modules 5, strengthening the overall stability of the battery pack structure. By simplifying the assembly process and enhancing structural stability, production efficiency and product reliability are improved, ensuring stable operation and good performance of the air-cooled battery pack under different operating conditions. Regarding increasing battery capacity, multiple symmetrically arranged cell modules 5 expand the battery pack's capacity and energy density. While ensuring good heat dissipation, the reasonable symmetrical layout fully utilizes the space within the housing 1, allowing for the placement of more cell modules 5, thereby increasing the battery pack's energy storage capacity. This better meets the energy storage requirements of large-capacity battery packs, enabling the air-cooled battery pack to operate stably and maintain good performance under various operating conditions, effectively mitigating the negative effects of insufficient heat dissipation and unreasonable layout on battery pack performance.

[0048] The shape of the housing 1 and the location and connection relationship of the first air inlet 9 in this embodiment will be described in detail below.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the housing 1 is rectangular, and a first air inlet 9 is provided on the back of the housing 1, which is connected to the inlet end 7 of the built-in air duct 6.

[0050] Specifically, by designing the housing 1 as a rectangle, a regular and orderly space is created for the internal components such as the cell module 5 and the built-in air duct 6. The rectangular shape allows for the rational planning and utilization of space in all corners and edges of the housing 1. Compared to an irregularly shaped housing 1, it effectively reduces the difficulties in component layout or space waste caused by odd spatial shapes. Optimizing the shape of the housing 1 promotes the orderly arrangement and installation of various components within the housing 1, not only improving assembly efficiency but also enhancing the stability and compactness of the entire air-cooled battery pack structure. Regarding the precise guidance of cold air, a first air inlet 9 is set on the back of the housing 1 and connected to the inlet end 7 of the built-in air duct 6, clearly defining the specific path for cold air to enter the built-in air duct 6. When external cold air flows in, it can enter the built-in air duct 6 in an orderly manner through the first air inlet 9 on the back of the housing 1. This design makes the direction and path of cold air entry clearer and more concentrated. By precisely guiding the cold air, the control over the cold air is enhanced, allowing the cold air to be delivered to the housing 1 more efficiently. This enables targeted heat dissipation of the cell modules 5 in the central area, effectively alleviating the problem of heat dissipation difficulties in the central cells of the large-capacity battery pack. It also reduces the temperature rise caused by poor heat dissipation and the problem of excessive temperature difference in the entire pack, ensuring the thermal stability of the air-cooled battery pack during operation, improving the overall heat dissipation effect, and enabling the battery pack to operate stably and maintain good performance under different operating conditions.

[0051] The details of the second air inlets 10 on both sides of the housing 1 in this embodiment will be described below.

[0052] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the two sides of the housing 1 are respectively provided with second air inlets 10, and these second air inlets 10 are spaced apart along the extension direction of the side of the housing 1, and are arranged on the side of the housing 1 according to the rule that the air inlets in the middle are larger and the air inlets at both ends are smaller.

[0053] In this embodiment, those skilled in the art will understand that, in terms of improving overall air intake efficiency, the provision of second air inlets 10 on both sides of the housing 1 significantly increases the path and flow rate of cold air entering the housing 1. Compared to designs relying solely on a single air inlet 3 or a small number of air inlets 3, the multiple second air inlets 10 on both sides of the housing 1 can introduce cold air from different directions, effectively widening the air intake channel and allowing more cold air to enter the housing 1. By increasing the air intake path and flow rate in this way, the overall heat dissipation capacity is significantly enhanced, providing a more sufficient cold source for components such as the battery cell module 5 inside the housing 1. This effectively improves the insufficient heat dissipation of the battery cells inside the large-capacity battery pack, reduces the risk of temperature rise caused by poor heat dissipation, and ensures that the battery pack can operate stably and maintain good thermal performance under different operating conditions. In terms of improving heat dissipation uniformity, the multiple second air inlets 10 are spaced apart along the side extension direction of the housing 1, causing the cold air entering the housing 1 to be evenly distributed in the side area. This spaced distribution effectively avoids excessive concentration or lack of cold air in local areas, ensuring a relatively balanced supply of cold air to all parts on both sides of the housing 1. The uniform airflow distribution significantly improves the uniformity of heat dissipation, ensuring stable and suitable heat dissipation conditions for the battery cell modules 5 at different locations. This reduces localized overheating or underheating caused by uneven heat dissipation, thereby improving the stability and reliability of the entire battery cell module group 5 and extending the battery pack's lifespan. Regarding the optimized airflow distribution, the arrangement of the second air inlet 10, with a larger central inlet and smaller end inlets, is determined based on the internal heat distribution characteristics and heat dissipation requirements of the housing 1. The battery cell modules 5 in the middle area of ​​the housing 1 are relatively far from the edge heat dissipation area and are surrounded by many other battery cell modules 5, resulting in more complex heat exchange and making heat accumulation and heat dissipation more difficult. The larger central inlet provides more ample cold air to the battery cell modules 5 in the middle area of ​​the housing 1, enhancing the heat dissipation effect on the cells in this area and allowing heat to be carried away more quickly. The two ends of the battery pack, being close to the edge of the housing 1, have relatively good heat dissipation conditions, and with fewer surrounding cell modules 5, smaller vents are sufficient to meet their heat dissipation needs. By rationally allocating the size of the vents, the utilization efficiency of cold air is optimized, more precisely meeting the heat dissipation requirements of cell modules 5 in different locations. This effectively solves the problem of insufficient heat dissipation of cells inside large-capacity battery packs, reduces the overall temperature difference of the pack, and ensures that the air-cooled battery pack maintains good heat dissipation and stable performance under different operating conditions.

[0054] The device at the air outlet 4 of the housing 1 in this embodiment will be described in detail below.

[0055] like Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments, an air suction device 12 is provided at the air outlet 4 of the housing 1.

[0056] In this embodiment, those skilled in the art will understand that, in terms of enhancing exhaust power, the suction device 12 installed at the air outlet 4 generates a strong suction force at that location. This suction force can significantly accelerate the exhaust speed of hot air inside the housing 1. When the air around the battery cell module 5 absorbs heat and becomes hot air, under the action of the suction device 12, the hot air can be drawn out of the housing 1 more quickly, effectively preventing the accumulation of hot air inside the housing 1. By enhancing exhaust power, the efficiency of the heat dissipation process is effectively guaranteed, significantly improving the poor heat dissipation caused by the retention of hot air inside the large-capacity battery pack, reducing the risk of performance degradation or damage to the battery cells due to high-temperature environments, and ensuring that the battery pack can operate stably and maintain good thermal performance under different operating conditions. In terms of optimizing airflow circulation, the suction force generated by the suction device 12 not only helps to exhaust hot air but also coordinates with the entry of cold air at the air inlet 3. Due to the suction force, a stronger and more orderly airflow circulation is formed inside the housing 1. Outside cold air can enter the housing 1 more smoothly from the air inlet 3, and after heat exchange with the cell module 5, it can be quickly guided by the suction device 12 and discharged from the air outlet 4. By optimizing the airflow circulation, the heat dissipation effect on the cell module 5 is further improved, ensuring that the cell module 5 is always in a suitable temperature environment. This effectively solves the problem of insufficient heat dissipation of the cells inside the large-capacity battery pack, reduces the overall temperature difference of the pack, and allows the air-cooled battery pack to maintain good thermal stability under various operating conditions, ensuring reliable and stable operation of the battery pack and extending its service life.

[0057] The overall external structure of the box 1 and the arrangement of the top cover 13 in this embodiment will be described in detail below.

[0058] like Figure 1 and Figure 2 As shown, in some embodiments, the box 1 is a rectangular box 1 with its largest surface being horizontal, and the box 1 has an upper cover 13, which is detachably covered on the largest surface of the box 1.

[0059] In this embodiment, those skilled in the art will understand that, in terms of improving structural stability, designing the housing 1 as a rectangle with its largest surface horizontally positioned provides a stable foundation for the air-cooled battery pack. The rectangular shape makes the forces on the housing 1 more even in all directions, and the horizontally positioned largest surface increases the contact range with the supporting surface, significantly reducing the probability of wobbling or tilting due to unstable placement. By optimizing the structural stability of the housing 1, the relative positional stability of internal components such as the cell module 5 and the built-in air duct 6 is effectively guaranteed, reducing the adverse effects of external vibrations or shaking on the internal structure of the battery pack, and ensuring that the battery pack can operate stably and maintain excellent performance under various operating conditions. In terms of facilitating assembly and maintenance, the detachable top cover 13 design greatly simplifies the assembly and maintenance process of the battery pack. During assembly, components such as the cell module 5 and the built-in air duct 6 can be placed inside the housing 1 first, and then the top cover 13 can be installed. This step-by-step operation mode reduces the difficulty of assembly and effectively improves production efficiency. During maintenance, only the top cover 13 needs to be removed to easily inspect, repair, or replace the components inside the housing 1, without the need for cumbersome disassembly of the entire housing 1 structure. By simplifying the assembly and maintenance process, maintenance costs and time are effectively reduced, the practicality and reliability of the air-cooled battery pack are enhanced, its service life is extended, and stable operation under different operating conditions is ensured.

[0060] like Figures 1 to 5 As shown, the working principle of an air-cooled battery pack in this embodiment is as follows:

[0061] 1. Cold Air Introduction: Outside cold air enters through multiple air inlets 3 of the enclosure 1. Specifically, the first air inlet 9 at the rear directs cold air into the internal air duct 6, while the second air inlets 10 on both sides of the enclosure 1 also introduce cold air into the cavity 2 of the enclosure 1. The layout and design of these air inlets 3 allow cold air to enter from different directions and positions, increasing the airflow path and volume, and providing a sufficient cooling source for heat dissipation.

[0062] 2. Cold Air Distribution via Built-in Air Duct 6: Cold air entering the built-in air duct 6 can only be blown out through the internal air outlet 8 on the side because the second end 11 of the air duct is closed. The internal air outlet 8 is a vertical strip-shaped opening spaced apart along the extension direction of the air duct, and arranged according to the rule of being larger in the middle and smaller at both ends, so that the cold air is blown out evenly and in a targeted manner. The larger air outlet in the middle provides more cold air to the battery cell module 5, which is close to the center of the housing 1 and has greater difficulty in heat dissipation; the smaller air outlets at both ends meet the heat dissipation needs of the battery cell module 5 in the surrounding areas with better heat dissipation conditions, improving the uniformity and efficiency of heat dissipation.

[0063] 3. Heat dissipation of battery cell modules 5: Multiple battery cell modules 5 are symmetrically arranged on both sides of the built-in air duct 6 to receive cool air flowing from the internal air outlet 8 of the built-in air duct 6 and the inner cavity of the housing 1. The cool air carries away the heat generated by the operation of the battery cell modules 5, realizing heat exchange, reducing the temperature of the battery cells, avoiding overheating caused by heat accumulation, and ensuring the stability and safety of the battery cell performance.

[0064] 4. Hot air exhaust: The hot air that has absorbed heat flows inside the housing 1. Because there is a gap between the second end 11 of the built-in air duct 6 and the air outlet 4 of the housing 1, the hot air is orderly extracted from the housing 1 under the action of the suction device 12 at the air outlet 4. This accelerates the air circulation and renewal inside the housing 1, enhances the heat dissipation effect, maintains the temperature stability inside the housing 1, reduces the temperature difference of the entire pack, and enables the battery pack to operate stably under different working conditions.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. A wind-cooled battery pack, characterized in that, include: The housing (1) has a cavity (2) inside, and the side of the housing (1) is provided with multiple air inlets (3) and at least one air outlet (4); the battery cell module (5) has multiple sets of cells spaced apart inside the housing (1); An internal air duct (6) is disposed inside the cavity (2). The internal air duct (6) has a first end and a second end (11) disposed opposite to each other. The first end has an inlet end (7) which is connected to an air inlet (3) of the housing (1). The second end (11) is closed. The internal air duct (6) extends from the air inlet (3) toward the air outlet (4), and there is a gap between the second end (11) and the air outlet (4). Multiple internal air outlets (8) are provided on the side of the internal air duct (6).

2. The air-cooled battery pack according to claim 1, characterized in that, The built-in air duct (6) is a rectangular column, and the internal air outlet (8) is located on both sides of the built-in air duct (6).

3. The air-cooled battery pack according to claim 2, characterized in that, The internal air outlet (8) is a vertically arranged strip-shaped opening.

4. The air-cooled battery pack according to claim 3, characterized in that, Multiple internal air outlets (8) are spaced apart along the extension direction of the built-in air duct (6), and the multiple internal air outlets (8) are arranged on the built-in air duct (6) according to the rule that the air outlets in the middle are larger and the air outlets at both ends are smaller.

5. The air-cooled battery pack according to claim 1, characterized in that, Multiple sets of the battery cell modules (5) are symmetrically arranged on both sides of the built-in air duct (6).

6. The air-cooled battery pack according to claim 1, characterized in that, The box (1) is rectangular, and a first air inlet (9) is provided on the back of the box (1). The inlet end (7) of the built-in air duct (6) is connected to the first air inlet (9).

7. The air-cooled battery pack according to claim 6, characterized in that, The box (1) is provided with a second air inlet (10) on each of its two sides. Multiple second air inlets (10) are spaced apart along the extension direction of the side of the box (1). Multiple second air inlets (10) are arranged on the side of the box (1) in a pattern of larger air inlets in the middle and smaller air inlets at both ends.

8. The air-cooled battery pack according to claim 7, characterized in that, A suction device (12) is provided at the air outlet (4) of the box (1).

9. The air-cooled battery pack according to any one of claims 1-8, characterized in that, The box (1) is a rectangular box (1), and the largest surface of the box (1) is horizontal; the box (1) has a top cover (13), and the top cover (13) is detachably covered on the largest surface of the box (1).

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