Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body, clapboards and a plurality of modules, the box body is provided with a containing cavity, the clapboards are arranged in the containing cavity and divide the containing cavity into a plurality of air channels, the box body is provided with air ports in corresponding areas of two opposite ends of the air channels, the directions of air flows in the adjacent air channels are opposite, and the clapboards are provided with serial flow holes. The series flow holes are communicated with the adjacent air channels, the multiple modules are arranged in the multiple air channels correspondingly, and the technical purposes of improving the uniformity of cooling airflow and reducing the temperature difference of different areas are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery heat dissipation technical field especially relates to a battery pack. BACKGROUND

[0002] In order to improve the heat dissipation efficiency of battery, the air cooling technology is widely used in the thermal management of battery pack, and the battery system is cooled by using air flow. However, in the existing air-cooled battery system, the conventional air duct design is adopted, and because the temperature of the cooling air flow is usually gradually increased when flowing through the air duct. Since the air cooling system relies on the flow of air for heat exchange, as the temperature of the air flow gradually increases, the heat dissipation effect of the air cooling system will gradually decrease. The gradually increasing air flow temperature leads to the difference in heat dissipation efficiency between different regions inside the system, thereby forming a temperature difference. The existence of temperature difference not only affects the balance of battery monomer, but also may cause overheating, thermal runaway and other safety hazards, and in severe cases, it may have a long-term impact on the stability and life of the battery system.

[0003] Therefore, in the existing air-cooled battery system, how to improve the uniformity of the cooling air flow and reduce the temperature difference between different regions has become a problem to be solved. SUMMARY

[0004] One purpose of the utility model is to provide a battery pack, which aims to solve the technical problem of how to improve the uniformity of the cooling air flow and reduce the temperature difference between different regions.

[0005] To achieve the above purpose, the utility model provides a scheme: a battery pack, the battery pack includes a box body, which is provided with a containing cavity; a partition plate, the partition plate is arranged in the containing cavity, and the containing cavity is divided into a plurality of air ducts, the box body is provided with an air port in the corresponding area of the opposite ends of the air duct, the air flow directions in adjacent air ducts are opposite, and the partition plate is provided with a series flow hole, and the series flow hole communicates adjacent air ducts; a plurality of modules are arranged in the plurality of air ducts.

[0006] Optionally, the number of series flow holes is at least two, and the series flow holes are arranged along the extension direction of the partition plate.

[0007] Optionally, in the extension direction of the partition plate, from both ends of the partition plate to the middle part, the hole diameter of the series flow hole gradually decreases.

[0008] Optionally, in the extension direction of the partition plate, from one end of the partition plate to the middle area and from the other end of the partition plate to the middle area, the distribution position and hole diameter of the series flow hole are the same.

[0009] Optionally, the box body comprises oppositely arranged side plates and oppositely arranged end plates, the side plates are parallel to the extension direction of the partition plate, the end plates are perpendicular to the extension direction of the partition plate, and the side plates and the end plates are enclosed; in the end plate region corresponding to the air duct, the air inlet is arranged in the corner region of the end plate close to the side plate, and the other air inlet is arranged in the corner region of the other end plate close to the partition plate, and the opposite air inlets are away from each other in the height direction of the module.

[0010] Optionally, the box body further comprises oppositely arranged bottom plates and cover plates, the bottom plates and the cover plates respectively seal two ends of the side plate and the end plate enclosed structure to form a containing cavity; the air inlet comprises an air inlet and an air outlet, the air inlet is arranged in the region of the end plate close to the bottom plate, and the air outlet is arranged in the region of the end plate close to the cover plate.

[0011] Optionally, the module comprises a plurality of battery cells, and the plurality of battery cells are arranged along the thickness direction of the battery cells, and the thickness direction of the battery cells and the extension direction of the partition plate are perpendicular to each other.

[0012] Optionally, the module further comprises a clamping plate, the clamping plate is arranged between adjacent battery cells, and the clamping plate is provided with a through groove in the extension direction of the partition plate, and the through groove communicates two ends of the clamping plate.

[0013] Optionally, in the height direction of the module, the clamping plate protrudes from the battery cell and is in contact with the box body, and the battery cell and the box body are arranged in a spaced manner.

[0014] Optionally, the battery pack further comprises a fan, the fan is connected with the box body, and the fan seals the air inlet.

[0015] The beneficial effects of the utility model lie in:

[0016] Compared with the prior art, the application separates the containing cavity of the battery pack into a plurality of air ducts through the partition plate, opens an air inlet in the opposite box body region of each air duct, makes the airflow directions in adjacent air ducts opposite, and makes the airflows in adjacent air ducts exchange heat through the series flow holes arranged on the partition plate, so as to balance the airflow temperature in the air duct, reduce the amplitude of temperature change, keep the temperature of the airflow uniform in the whole running process, and avoid the problems of uneven heat dissipation and overheating caused by too large temperature difference. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is the whole schematic view of the battery pack provided by the utility model embodiment;

[0019] Figure 2 is a structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0020] Figure 3 is a structural schematic diagram of a box provided by an embodiment of the present application;

[0021] Figure 4 is a top view of a battery pack provided by an embodiment of the present application;

[0022] Figure 5 is a structural schematic diagram of a battery pack provided by an embodiment of the present application; Figure 4 is a sectional view in A-A direction;

[0023] Figure 6 is a sectional view in B-B direction provided by an embodiment of the present application. Figure 4

[0024] Explanation of reference signs:

[0025] 10, box; 11, containing cavity; 12, air duct; 13, air port; 131, air inlet; 132, air outlet; 14, side plate; 15, end plate; 16, bottom plate; 17, cover plate; 20, partition plate; 21, string flow hole; 30, module; 31, electric core; 32, clamping plate; 321, through slot; 40, fan. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Please refer to Figures 1 to 3 shown, Figure 1 is a whole schematic diagram of a battery pack provided by an embodiment of the present application, Figure 2 is a structural schematic diagram of a battery pack provided by an embodiment of the present application, Figure 3 is a structural schematic diagram of a box 10 provided by an embodiment of the present application.

[0028] The embodiment of the present application provides a battery pack, which aims to solve how to improve the uniformity of cooling air flow, reduce the temperature difference in different areas, and improve the heat dissipation effect and stability of a battery system.

[0029] ​Specifically, the battery pack includes a housing 10, a partition 20, and multiple modules 30. The housing 10 has an internal cavity 11 for accommodating the multiple battery modules 30 and providing sufficient space for cooling airflow. To optimize the distribution of cooling airflow, the partition 20 is installed within the cavity 11, dividing it into multiple air ducts 12. The air ducts 12 allow cooling airflow to flow along predetermined paths. The multiple battery modules 30 are respectively disposed within the multiple air ducts 12, and each module 30 can fully utilize the cooling airflow passing through the air duct 12 for heat dissipation.

[0030] The housing 10 has air vents 13 in corresponding areas at opposite ends of the air duct 12. The air vents 13 serve as air inlets and outlets to ensure that cooling air can effectively enter and exit the battery pack. To further optimize the airflow path, the airflow directions in adjacent air ducts 12 are set to be opposite, that is, when the airflow in one air duct 12 enters from one end, the airflow in the other air duct 12 enters from the opposite end.

[0031] Correspondingly, the partition 20 is provided with multiple flow holes 21. The function of the flow holes 21 is to connect the airflow between adjacent air ducts 12, allowing the airflow to exchange heat between the air ducts 12 to balance the airflow temperature within the air ducts 12. When the airflow temperature in one of the air ducts 12 gradually increases, the presence of the flow holes 21 allows the airflow in the adjacent air ducts 12 to carry away some heat through heat exchange, thereby reducing the airflow temperature.

[0032] In this embodiment, since the airflow directions within adjacent air ducts 12 are opposite, during the operation of the cooling system, when the airflow temperature in one air duct 12 rises, the airflow temperature in the adjacent air duct 12 in the same direction gradually decreases. Through the crossflow holes 21 on the partition 20, the airflow between the two air ducts 12 can exchange heat, thereby reducing the magnitude of temperature changes and ensuring that the airflow temperature remains balanced throughout its movement. The airflow temperature within the battery pack is effectively balanced, avoiding uneven heat dissipation and overheating problems caused by excessive temperature differences.

[0033] Further, please refer to Figures 4 to 6 , Figure 4 This is a top view of the battery pack provided in an embodiment of the present invention. Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Cross-sectional view along the AA direction. Figure 6 This is provided by the embodiment of the present utility model. Figure 4 A cross-sectional view along the BB direction. To enhance the heat exchange efficiency between airflows, the number of cross-flow holes 21 is at least two, and these cross-flow holes 21 are spaced apart along the extension direction of the partition 20.

[0034] In this embodiment, the arrangement of multiple flow holes 21 allows for more efficient heat exchange between adjacent air ducts 12, reducing temperature differences. The flow holes 21, arranged along the extension direction of the partition 20, ensure uniform airflow within each section of the air duct 12, resulting in a more uniform temperature distribution and preventing localized overheating or excessive temperature differences. This layout not only improves cooling efficiency but also ensures effective temperature control of the airflow as it flows through each module 30, further optimizing the battery's thermal management performance and enhancing the battery pack's safety and lifespan.

[0035] Further, please refer to Figure 6 , Figure 6 This is provided by the embodiment of the present utility model. Figure 4 A cross-sectional view along the BB direction. Based on the characteristics of airflow temperature distribution, during the operation of the battery pack, the airflow temperature in the air duct 12 gradually increases near both ends of the separator 20 along its extension direction. To effectively improve the heat exchange efficiency in this area, the aperture of the cross-flow holes 21 decreases sequentially from both ends to the middle of the separator 20 along its extension direction.

[0036] In this embodiment, the aperture of the flow-through orifice 21 is larger near both ends, which accelerates heat transfer and achieves faster temperature regulation, reducing temperature differences. As the airflow enters the area near the middle, the aperture of the flow-through orifice 21 gradually decreases because the temperature difference is already small, preventing excessive airflow exchange that could lead to temperature imbalances. This gradient aperture design allows for more precise adjustment of the heat exchange rate between the air ducts 12, ensuring a uniform temperature distribution within the air ducts 12. This optimizes the overall heat dissipation efficiency of the battery pack, further improving the thermal management performance of the battery system and reducing safety hazards caused by excessive temperature differences.

[0037] Furthermore, in the extending direction of the partition 20, the distribution position and aperture setting of the flow holes 21 are the same from one end to the middle region and from the other end to the middle region of the partition 20. That is, the distribution of the flow holes 21 on the partition 20 not only has a gradual design in aperture but is also symmetrically arranged in position. In the extending direction of the partition 20, the distribution position and aperture setting of the flow holes 21 are symmetrical about the centerline of the partition 20. The symmetrical design allows the airflow to maintain a consistent heat exchange efficiency in two opposite directions, ensuring that the airflow temperature regulation can be uniformly carried out within the air ducts 12 at both ends of the partition 20.

[0038] In the embodiment, the middle line of the partition plate 20 divides the air duct 12 into two symmetrical regions, and the through-flow holes 21 in the two regions are completely symmetrical in number, aperture variation rule and position. Due to the symmetry, during the operation of the battery pack, no matter which end the cooling airflow enters from, the heat exchange effect of the through-flow holes 21 can remain consistent, avoiding the temperature asymmetry problem caused by uneven design. The symmetrical distribution can more effectively balance the airflow temperature between different air ducts 12 in the battery pack, ensure that the temperature distribution in the entire battery pack is more uniform, improve the heat dissipation efficiency, reduce the local overheating and safety risk caused by temperature difference, and thus improve the overall performance and stability of the battery system.

[0039] In some embodiments, referring to Figure 3 , Figure 3 is a structural schematic view of the box body 10. The box body 10 includes oppositely arranged side plates 14 and oppositely arranged end plates 15, wherein the side plates 14 are parallel to the extension direction of the partition plate 20, and the end plates 15 are perpendicular to the extension direction of the partition plate 20, and the side plates 14 and the end plates 15 are arranged in a closed manner.

[0040] In order to optimize the cooling effect of the airflow, one of the air inlets 13 in the region of the corresponding end plate 15 of the air duct 12 is arranged in the corner area close to the side plate 14, and the other air inlet 13 is arranged in the corner area close to the partition plate 20 of the other end plate 15. In addition, in the height direction of the module 30, the opposite air inlets 13 are away from each other. Through this layout, the airflow coverage area in the air duct 12 is significantly expanded, thereby avoiding the concentration of airflow in a small range.

[0041] In the embodiment, the air inlets 13 in the same air duct 12 are arranged in the regions of the two end plates 15 corresponding to the air duct 12, and the air inlets 13 are arranged in diagonal positions. The purpose of this layout is to make the airflow cover the entire cross section of the air duct 12, and ensure that each module 30 can be uniformly cooled, avoiding local overheating caused by insufficient airflow. In the traditional air cooling design, if the air inlets 13 are oppositely arranged, it may cause that the side airflow cannot effectively cover some areas in the air duct 12, resulting in uneven heat dissipation. By diagonally arranging the air inlets 13, the airflow can flow through the entire air duct 12 as much as possible, ensuring that each module 30 in the battery pack can be uniformly cooled. Not only improves the heat dissipation efficiency, reduces the risk of local overheating, but also greatly enhances the thermal management capability of the battery pack, which helps to keep the battery system running at the best working temperature.

[0042] Further, the box body 10 further comprises a bottom plate 16 and a cover plate 17 arranged oppositely, the bottom plate 16 and the cover plate 17 seal two ends of the structure enclosed by the side plate 14 and the end plate 15 respectively, so as to form a complete containing cavity 11. The arrangement of the bottom plate 16 and the cover plate 17 not only helps to enhance the structural stability of the battery pack, but also can effectively seal the containing cavity 11 to prevent the invasion of external substances and provide a closed space to optimize the cooling effect.

[0043] Meanwhile, the air inlet 131 is arranged at the area of the end plate 15 close to the bottom plate 16, and the air outlet 132 is arranged at the area of the end plate 15 close to the cover plate 17. Since the density of hot air is smaller than that of cold air, the hot air will naturally rise to form an upward air flow path. Arranging the air inlet 131 at the area of the end plate 15 close to the bottom plate 16 can ensure that the cold air enters the air duct 12 from the bottom and flows upward along the natural flow direction of the air flow. And arranging the air outlet 132 at the area of the end plate 15 close to the cover plate 17 can utilize the rising characteristics of hot air to discharge the air with higher temperature from the top.

[0044] In the embodiment, the layout of the air inlet 131 and the air outlet 132 is designed based on the physical characteristics of hot air, conforms to the natural flow law of the air flow, and can improve the flowability of the air flow and the heat dissipation efficiency. After the cold air enters through the air inlet 131, it can smoothly flow through the plurality of modules 30 inside the battery pack, absorb heat and carry away excess heat, and the cold air is converted into hot air. By the rising characteristics of hot air, the hot air is discharged from the system through the air outlet 132. By optimizing the air flow path, the air cooling system can more efficiently complete the heat dissipation task, and avoid the situation that the temperature difference is too large or local overheating caused by poor air flow.

[0045] In some embodiments, referring to Figure 5 , Figure 5 provided by the embodiment of the utility model Figure 4 is the sectional view of A-A direction in the embodiment. The module 30 comprises a plurality of battery cells 31 arranged along the thickness direction of the battery cells 31. The thickness direction of the battery cells 31 and the extension direction of the partition plate 20 are perpendicular to each other. The purpose is to optimize the heat exchange efficiency between the air flow and the battery cells 31. Through this arrangement, the gap direction between the battery cells 31 will be parallel to the first direction of the air duct 12, that is, parallel to the flow direction of the air flow, so that the air flow can flow in the gap between the battery cells 31 and exchange heat.

[0046] In this embodiment, when the airflow flows along a direction parallel to the gap between the battery cells 31, the airflow can effectively pass through each gap between the battery cells 31, thereby achieving a larger heat exchange area. When the airflow flows through each battery cell 31, it can more fully exchange heat with the surface of the battery cell 31, effectively carrying away the heat generated inside the battery cell 31. Compared with the way in which the airflow is perpendicular to the surface of the battery cell 31 in other designs, this parallel arrangement can significantly increase the surface area of heat exchange, thereby improving the heat dissipation efficiency.

[0047] In addition, the arrangement of the gap between the battery cells 31 parallel to the direction of the airflow makes the flow of the airflow smoother, reducing the impact of resistance on the airflow. Not only does it help to improve the flow rate of the airflow through the module 30, but it also reduces local turbulence inside the air duct 12, thereby improving the overall heat exchange efficiency of the airflow.

[0048] Further, the module 30 also includes a clamping plate 32 arranged between adjacent battery cells 31 to ensure the stable position and structural support of the battery cells 31 in the module 30. The clamping plate 32 helps to improve the mechanical strength of the battery module 30, preventing displacement or deformation between the battery cells 31, while also effectively promoting optimization of the heat dissipation process.

[0049] The clamping plate 32 is arranged along the extension direction of the partition plate 20, and a through groove 321 is formed in the clamping plate 32. The through groove 321 provides an airflow passage, allowing the airflow to flow in from one end of the clamping plate 32 and directly flow to the other end of the clamping plate 32 through the through groove 321, further improving the cooling efficiency.

[0050] In this embodiment, the clamping plate 32 not only provides structural support, but also effectively enhances the heat dissipation capacity through the airflow passage of the through groove 321. The airflow exchanges heat when passing through the through groove 321, improving the heat dissipation effect and helping to accelerate the removal of heat, thereby improving the overall cooling efficiency of the battery pack.

[0051] Further, to improve the heat dissipation effect, in the height direction of the module 30, the clamping plate 32 is designed to protrude from the battery cells 31 and contact the box 10, while maintaining a certain gap between the battery cells 31 and the box 10. The purpose is to further optimize the heat dissipation process by increasing the airflow passage between the battery cells 31 and the box 10.

[0052] Specifically, after the clamping plate 32 protrudes from the battery cells 31 and contacts the box 10, the clamping plate 32 serves to support the battery cells 31. At this time, a gap is formed between the bottom of the battery cells 31 and the bottom of the box 10, rather than the battery cells 31 directly adhering to the bottom of the box 10 as in traditional designs. The arrangement of the gap has an important heat dissipation effect, as it provides a smoother path for the flow of the airflow, which can flow from the bottom of the battery cells 31 to the bottom of the box 10 through the gap, thereby achieving more efficient heat exchange.

[0053] In this embodiment, compared to the conventional design where the cell 31 is tightly fitted to the bottom of the housing 10, this embodiment improves airflow. Because the airflow can pass through the gap between the bottom surface of the cell 31 and the bottom of the housing 10, it effectively carries away the heat generated at the bottom of the cell 31, preventing heat accumulation. In this way, heat can be quickly carried away and dissipated, thereby reducing localized temperature increases and preventing battery performance degradation or safety hazards caused by overheating of the cell 31 or localized overheating.

[0054] In some embodiments, the heat dissipation system of the battery pack is further optimized. The battery pack also includes a fan 40, which is fixedly connected to the housing 10 and covers the air vent 13. The fan 40 is configured to actively drive airflow inside or outside the battery pack, thereby accelerating air circulation and improving cooling efficiency.

[0055] In this embodiment, the fan 40 effectively guides external air into the battery pack, enhancing internal airflow. Airflow is generated by rotating blades, propelling air through the gap between the air duct 12 and the module 30 within the battery pack. Due to the powerful airflow from the fan 40, air quickly flows over the surface of the battery module 30, carrying away the heat generated by the battery during operation. This active cooling mechanism effectively compensates for the shortcomings of natural airflow cooling, especially under high load or high temperature environments, where the use of the fan 40 significantly improves the battery pack's heat dissipation capacity.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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. A battery pack, characterized in that, include: The box body has a receiving cavity; A partition is disposed in the receiving cavity, dividing the receiving cavity into multiple air ducts. The housing has air vents in corresponding areas at opposite ends of the air ducts. The airflow directions in adjacent air ducts are opposite, and the partition has cross-flow holes that connect to adjacent air ducts. Multiple modules are respectively installed in the multiple air ducts.

2. The battery pack according to claim 1, characterized in that, The number of flow holes is at least two, and they are arranged along the extension direction of the partition.

3. A battery pack according to claim 2, characterized in that, In the extending direction of the partition, the diameter of the flow holes decreases sequentially from both ends to the middle of the partition.

4. A battery pack according to claim 3, characterized in that, In the extending direction of the partition, the distribution position and aperture of the flow holes are the same from one end of the partition to the middle region and from the other end of the partition to the middle region.

5. A battery pack according to claim 1, characterized in that, The enclosure includes oppositely arranged side panels and oppositely arranged end panels. The side panels are parallel to the extending direction of the partition, and the end panels are perpendicular to the extending direction of the partition. The side panels and the end panels enclose each other. Within the end plate area corresponding to the air duct, one air outlet is located in the angled area of ​​the end plate near the side plate, and another air outlet is located in the angled area of ​​another end plate near the partition. The air outlets opposite each other in the height direction of the module are far apart from each other.

6. A battery pack according to claim 5, characterized in that, The enclosure also includes a bottom plate and a cover plate arranged opposite to each other, the bottom plate and the cover plate respectively covering the two ends of the structure enclosing the side plate and the end plate to form the receiving cavity; The air vent includes an air inlet and an air outlet. The air inlet is located in the area of ​​the end plate near the bottom plate, and the air outlet is located in the area of ​​the end plate near the cover plate.

7. A battery pack according to claim 1, characterized in that, The module includes multiple battery cells arranged along its thickness direction, and the thickness direction of the battery cells is perpendicular to the extension direction of the separator.

8. A battery pack according to claim 7, characterized in that, The module also includes a clamping plate, which is disposed between adjacent battery cells, and the clamping plate has a through groove along the extension direction of the partition, the through groove connecting the two ends of the clamping plate.

9. A battery pack according to claim 8, characterized in that, In the module height direction, the clamping plate protrudes from the battery cell and contacts the housing, and the battery cell and the housing are spaced apart.

10. A battery pack according to any one of claims 1 to 9, characterized in that, The battery pack also includes a fan, which is connected to the housing and covers the air vent.

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