Air guide device of power battery pack, power battery pack assembly and automobile

Abstract

An air guide device of a power battery pack, a power battery pack assembly and an automobile are used for guiding airflow flowing through a battery pack body backwards, the air guide device comprises a first plate body and a second plate body, the first plate body is used for being connected with the battery pack body, and the second plate body is connected with the first plate body and inclines backwards relative to the first plate body; an included angle larger than or equal to 90 degrees is formed between the second plate body and the first plate body. According to the air guide device of the power battery pack provided by the utility model, the air guide device arranged at the tail end of the power battery pack body shields the rear suspension, so that airflow is guided by the air guide device to directly flow towards the tail of a vehicle without impacting the rear suspension, and the wind resistance at the rear suspension is reduced. In addition, according to the air guide device, the air guide part is approximately vertical to the power battery pack body, so that the material is saved, the cost is lower, the structure is simplified, and the economic benefit is good.

Description

Technical Field

[0001] This utility model relates to the field of power battery pack technology, and in particular to a power battery pack air guide device, a power battery pack assembly, and an automobile. Background Technology

[0002] When new energy vehicles are traveling at high speeds, a significant amount of electrical energy is actually used to overcome the vehicle's own wind resistance. Reducing wind resistance can decrease energy consumption and increase range, thereby alleviating users' range anxiety. Therefore, reducing overall vehicle wind resistance is a development direction that has received considerable attention. On the other hand, as new energy vehicles incorporate more and more functions, the overall vehicle weight increases, which also leads to a reduction in range.

[0003] Currently, the battery packs of most new energy vehicles are installed under the floor assembly. There is a large gap between the battery pack and the rear suspension in the X-direction. This gap is usually filled or reduced by a sealing plate to allow airflow to pass smoothly between the battery pack and the rear suspension, preventing the airflow from impacting the rear suspension along the chassis after passing through the battery pack and generating unnecessary wind resistance. However, the sealing plate is usually fixed between the battery pack and the rear suspension through multiple mounting points along the width of the vehicle. The numerous mounting points occupy a large area and require welding corresponding metal brackets for installation and fixation. This results in a complex structure, a large number of parts, and high cost. It also significantly increases the weight of the entire vehicle, making the improvement in range due to reduced wind resistance very limited.

[0004] Therefore, designing a structure that can reduce wind resistance at the battery pack and rear suspension while being as lightweight as possible is a technical challenge that new energy vehicle engineers urgently need to solve. Summary of the Invention

[0005] This utility model provides a lightweight air guide device for a power battery pack, used to guide the airflow flowing through the battery pack body backward. The air guide device includes a first plate and a second plate. The first plate is used to connect to the battery pack body. The second plate is connected to the first plate and is tilted backward relative to the first plate. The included angle formed between the second plate and the first plate is greater than or equal to 90°.

[0006] Furthermore, the height of the second plate gradually decreases from both ends toward the middle along its length.

[0007] Furthermore, the lower edge of the second plate is arched.

[0008] Furthermore, the lower edge of the second plate is straight.

[0009] Furthermore, the air guiding device also includes a connecting part, which is integrally connected to the first plate and the second plate respectively. The connecting part extends rearward from the rear end of the first plate and the second plate extends downward from the lower end of the connecting part.

[0010] Furthermore, the air guide device is provided with a plurality of connecting bosses, the connecting bosses are located on the side of the first plate facing the power battery pack body, and the side of the first plate away from the power battery pack body is formed with a recess corresponding to the connecting bosses.

[0011] Furthermore, the present invention also includes a power battery pack assembly, which includes a battery pack body and a ventilation device, wherein the ventilation device is the aforementioned ventilation device for the power battery pack.

[0012] Furthermore, the power battery pack body includes a mounting part located at the rear end and below the power battery pack body, for mounting the air guide device.

[0013] Furthermore, the present invention also includes a vehicle comprising a battery pack body, an air guide device, and a rear suspension, wherein the rear suspension is located behind the battery pack body and the air guide device in the length direction of the vehicle body, and the air guide device is the aforementioned air guide device for the power battery pack.

[0014] Furthermore, the projection of the lower edge of the air guide device along the length of the vehicle coincides with the projection of the lower end of the rear suspension along the length of the vehicle.

[0015] The air guiding device for the power battery pack provided by this utility model shields the rear suspension by being located at the rear end of the power battery pack body. Since the projection of the air guiding device in the X-axis coincides with or covers the projection of the lower end of the rear suspension in the X-axis, the airflow, guided by the air guiding device, flows directly towards the rear of the vehicle without impacting the rear suspension, thereby reducing wind resistance at the rear suspension. Furthermore, the air guiding device in this utility model, by arranging the air guiding part approximately perpendicular to the power battery pack body, saves materials, has lower cost, and a simpler structure, resulting in good economic benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a power battery pack assembly provided in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the air guide device in one embodiment of the present invention.

[0018] Figure 3 This is a front view of the air guide device in one embodiment of the present invention.

[0019] Figure 4 This is a side view of the air guide device in one embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the air guide and rear suspension in one embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the air guiding device in another embodiment of the present invention.

[0022] Figure 7 This is a front view of the air guide device in another embodiment of the present invention. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended purpose of the invention, the present utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0024] It should be noted that the terms "first," "second," "third," "fourth," etc., in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] In this manual, the directional terms "X-direction," "Y-direction," and "Z-direction" refer to the "vehicle X-direction," "vehicle Y-direction," and "vehicle Z-direction" commonly used in the automotive industry, respectively. "Vehicle X-direction" refers to the length of the vehicle body, which is also the front-to-back direction; "Vehicle Y-direction" refers to the width of the vehicle body, which is also the left-to-right direction; and "Vehicle Z-direction" refers to the height of the vehicle body, which is also the up-and-down direction.

[0026] Please see Figure 1 The air guiding device of the power battery pack in this utility model includes a power battery pack body 1 and an air guiding device 2 disposed thereon. The power battery pack body 1 is disposed in the X direction in front of the rear suspension 3, and the air guiding device 2 is disposed at the rear end of the battery pack body 1 to guide the airflow flowing through the battery pack body 1 to the bottom of the rear suspension 3.

[0027] Specifically, the air guide device 2 includes an air guide section 2a for guiding airflow to below the rear suspension 3. The power battery pack body 1 is located on the side of the floor assembly facing the ground in the Z direction and near the B-pillar in the X direction; there is a gap between the power battery pack body 1 and the rear suspension 3 in the X direction, which is located in front of the rear wheel arch and near the C-pillar in the X direction; the air guide section 2a is located behind the end of the battery pack in the X direction. By blocking the front of the rear suspension 3 in the X direction and guiding the airflow backward and downward, the airflow flows towards the lower part of the rear of the vehicle under the guidance of the air guide section 2a, preventing the airflow from directly impacting the rear suspension 3 after passing the power battery pack body 1, thereby reducing the wind resistance at the rear suspension 3.

[0028] Please refer to the following: Figures 2 to 4 Furthermore, the air guiding device 2 includes a first plate 21, a second plate 22, and a connecting part 23. The first plate 21 is disposed below the power battery pack body 1 and is fixedly connected to the power battery pack body 1. The second plate 22 is disposed below the first plate 21 in the Z direction and forms an angle greater than or equal to 90° with the first plate 21, so that the second plate 22 is tilted backward and downward relative to the first plate 21 to guide the airflow backward and downward. The connecting part 23 is connected to the first plate 21 and the second plate 22 respectively. The connecting part 23 is obtained by extending backward and downward from the rear end of the first plate 21 in the X direction. The second plate 22 is obtained by extending downward at the lower end of the connecting part 23 in the Z direction. The upper end of the second plate 22 is used to connect with the connecting part 23. The lower end of the second plate 22 is located behind the upper end of the second plate 22 in the X direction. The air guiding part 2a is disposed on the side of the air guiding device 2 facing the airflow.

[0029] Specifically, in this embodiment, the first plate 21, the connecting part 23, and the second plate 22 are connected sequentially. Their cross-sections in the XZ plane are approximately an inverted "L" shape with the opening facing the front of the vehicle. The connecting part 23 extends rearward from the rear end of the first plate 21 and bends downward, with a roughly arc-shaped cross-section. The second plate 22 extends backward and downward from the lower end of the connecting part 23, forming an angle greater than 90° between the second plate 22 and the first plate 21. The first plate 21 is used for assembly with the power battery pack body 1, and the connecting part 23 is used to connect the first plate 21 and the second plate 22. The second plate 22 is used for windward airflow guidance. It can be understood that in some other embodiments of this invention, the connecting part 23 between the first plate 21 and the second plate 22 can be set as a plate with a straight cross-section. In other embodiments of this invention, the end of the first plate 21 in the X direction and the top of the second plate 22 in the Z direction are directly fixed together without a connecting part 23. It is easy to understand that the included angle between the second plate 22 and the first plate 21, as well as the length and width dimensions of the first plate 21 and the second plate 22, can be set according to the vehicle model and simulation calculation results. This utility model maximizes material savings and prevents airflow from impacting the rear suspension 3 by using the first plate 21 and the second plate 22 which is approximately perpendicular to the first plate 21. It has low cost, simple structure, and good economic benefits.

[0030] Furthermore, the air guide device 2 also includes a connecting boss 24, which is disposed on the side of the first plate 21 facing the power battery pack body 1. The air guide device 2 is fixed together with the power battery pack body 1 through the connecting boss 24. Specifically, the first plate 21 is provided with a plurality of connecting bosses 24, which are formed by stamping along the Z direction on the upper surface of the first plate 21. The lower surface of the first plate 21 has a corresponding recess. The connecting bosses 24 are provided with connecting holes, which correspond to the mounting points on the power battery pack body 1. The power battery pack body 1 is provided with a mounting part, which is disposed at the rear end of the power battery pack in the X direction and at the lower part of the power battery pack body 1 in the Z direction. The mounting part is used to assemble and fix with the connecting bosses 24, and is provided with mounting holes corresponding to the connecting holes. In this embodiment, the first plate 21 is provided with five connecting bosses 24 arranged along the Y direction, corresponding to the five mounting points of the mounting part at the tail end of the power battery pack body 1. The connecting holes and the corresponding mounting holes are passed through by the same bolt, so that the connecting bosses 24 and the mounting part are fixed together, thereby fixing the air guide device 2 relative to the power battery pack body 1. The part of the connecting bosses 24 protruding from the first plate 21 in the Z direction can cover the corresponding bolts in the X and Y directions, improving the aesthetics of the air guide device 2 and reducing wind resistance. It is easy to understand that the number and position of the connecting bosses 24 can be selected according to the structure and size of the power battery pack body 1. In a preferred embodiment of this utility model, the Z-direction distance between the air guide device 2 and the power battery pack body 1 and the Z-direction distance between the air guide device 2 and the ground can also be adjusted by adjusting the size of the connecting bosses 24 in the Z direction. This can be adjusted according to the vehicle model, battery pack, and rear suspension 3. For example, increasing the size of the connecting bosses 24 in the Z direction makes it easier to use larger bolts and nuts, which can reduce the number of mounting points while ensuring connection rigidity.

[0031] Please refer to the following: Figure 5 , Figure 5The perspective is from the front of the vehicle to the rear. Furthermore, in this invention, the projection of the lower edge 22a of the second plate 22 in the X-direction coincides with the projection of the lower end 3a of the rear suspension 3 in the X-direction. Specifically, in this embodiment, the second plate 22 includes a large end and a small end. The Z-direction dimension of the large end is larger than that of the small end. The large end is located at the left and right ends of the second plate 22 in the Y-direction, and the small end is located at the center of the second plate 22 in the Z-direction. That is, the dimension of the second plate 22 in the Z-direction gradually decreases from the left and right ends towards the center in its length direction. Therefore, the projection of the lower edge 22a of the second plate 22 in the X-direction is arched. The reason for this arrangement of the second plate 22 is that the projection shape of the lower end 3a of the rear suspension 3 in the X-direction is arched. After the airflow passes through the power battery pack body 1, it hits the air guide device 2 and flows under the air guide device 2 towards the lower part of the rear suspension 3. Since the projection of the lower edge 22a of the second plate 22 in the X direction is set to an arch shape and coincides with the projection of the lower end 3a of the rear suspension 3 in the X direction, that is, the lower ends of the two are flush, the airflow will not hit the rear suspension 3, but will flow directly from the lower part of the rear suspension 3 to the rear of the vehicle, thereby reducing the wind resistance at the rear suspension 3.

[0032] Please refer to the following: Figure 6 and Figure 7 In other embodiments of this utility model, the projection shape of the lower edge 22a of the second plate 22 in the X direction does not refer to the projection of the lower end 3a of the rear suspension 3 in the X direction, but is set to a straight line. Since there is no need to refer to the structure of the rear suspension 3 for corresponding design, the design cost is low and the versatility is strong. The projection of the second plate 22 in the X direction covers the projection of the lower end 3a of the rear suspension 3 in the X direction, that is, the lowest point of the lower edge 22a of the second plate 22 is level with or lower than the lowest point of the lower end 3a of the rear suspension 3. The second plate 22 set in this way can also prevent airflow from hitting the rear suspension 3. However, due to the relatively large area and the use of more material, the material cost and weight will inevitably increase, and the effect of reducing wind resistance will decrease accordingly.

[0033] Furthermore, the present invention also includes a power battery pack assembly, which includes the aforementioned air guide device for the power battery pack.

[0034] Furthermore, this utility model also includes a car that includes the aforementioned air duct device for the power battery pack.

[0035] In summary, the air guiding device of this utility model, located at the rear end of the power battery pack, shields the rear suspension. Because the projection of the air guiding device in the X-axis coincides with or covers the projection of the lower end of the rear suspension in the X-axis, the airflow, guided by the air guiding device, flows directly towards the rear of the vehicle without impacting the rear suspension, thereby reducing wind resistance at the rear suspension. Furthermore, by arranging the air guiding part approximately perpendicular to the power battery pack body, this utility model saves materials, has lower costs, a simpler structure, and better economic benefits.

[0036] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A wind deflector for a power battery pack, used to guide the airflow flowing through the battery pack body (1) backward, characterized in that: The air guide device (2) includes a first plate (21) and a second plate (22). The first plate (21) is used to connect the battery pack body (1). The second plate (22) is connected to the first plate (21) and tilted backward relative to the first plate (21). The included angle between the second plate (22) and the first plate (21) is greater than or equal to 90°.

2. The air guiding device for the power battery pack as described in claim 1, characterized in that: The height of the second plate (22) gradually decreases from both ends of its length toward the middle.

3. The air guiding device for the power battery pack as described in claim 2, characterized in that: The lower edge (22a) of the second plate (22) is arched.

4. The air guiding device for the power battery pack as described in claim 1, characterized in that: The lower edge (22a) of the second plate (22) is straight.

5. The air guiding device for the power battery pack as described in claim 1, characterized in that: The air guide device (2) further includes a connecting part (23), which is integrated with the first plate (21) and the second plate (22) respectively. The connecting part (23) extends backward from the rear end of the first plate (21), and the second plate (22) extends downward from the lower end of the connecting part (23).

6. The air guiding device for the power battery pack as described in claim 1, characterized in that: The air guide device (2) is provided with a plurality of connecting bosses (24). The connecting bosses (24) are located on the side of the first plate (21) facing the battery pack body (1). The side of the first plate (21) away from the battery pack body (1) has a recess corresponding to the connecting bosses (24).

7. A power battery pack assembly, characterized in that: It includes a battery pack body (1) and a wind guide device (2), wherein the wind guide device (2) is the wind guide device (2) of the power battery pack according to any one of claims 1 to 6.

8. The power battery pack assembly as described in claim 7, characterized in that: The battery pack body (1) includes a mounting part located at the rear end of the battery pack body (1) and below the battery pack body (1), for mounting the air guide device (2).

9. A car, characterized in that: The device includes a battery pack body (1), an air guide device (2), and a rear suspension (3). The rear suspension (3) is located behind the battery pack body (1) and the air guide device (2) in the length direction of the vehicle body. The air guide device (2) is the air guide device (2) of the power battery pack according to any one of claims 1 to 6.

10. The automobile as described in claim 9, characterized in that: The projection of the lower edge of the air guide device (2) in the length direction of the vehicle coincides with the projection of the lower end (3a) of the rear suspension (3) in the length direction of the vehicle.

Images