New energy automobile battery pack mounting structure

Abstract

The utility model discloses a new energy automobile battery pack installation structure which comprises an automobile body floor, an automobile body longitudinal beam and a battery pack body, the automobile body longitudinal beam is of a hollow structure, an installation structure is arranged in the hollow structure of the automobile body longitudinal beam, and the side edge portion of the battery pack body is located under the automobile body longitudinal beam. Fixing holes corresponding to the mounting structures are formed in the side edge parts of the battery pack body, and fasteners penetrate through the fixing holes to be fixedly matched with the mounting structures. The new energy automobile battery pack mounting structure is reasonable in design, the multi-point mounting structure is arranged in the automobile body longitudinal beam, the reinforcing structures are arranged in the automobile body longitudinal beam corresponding to the mounting points, and the rigidity and strength of the mounting points are effectively improved; the transmission of vibration energy in the vehicle by the battery pack is effectively inhibited, and the battery pack has important significance for improving the NVH (Noise Vibration and Harshness) performance of the whole vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to an installation structure of a new energy vehicle battery pack. Background Art

[0002] The main noise sources of traditional vehicles are mainly powertrain noises. At the medium and low frequency stages, some powertrain accessory noises and wind noises are masked by the powertrain noises. The vibration and noise sources of electric vehicles are relatively scattered, lacking the masking effect of engine noise. The main vibration source of vehicle vibration and noise is the road surface unevenness excitation. Therefore, the road noise component in the vehicle is prominent, affecting the customer experience of electric vehicles, and thus directly affecting product sales and brand image. The battery pack is arranged on the longitudinal beam of the lower body of the electric vehicle. And under the current technical conditions, to increase the cruising range, the mass of the battery pack is getting larger and larger, which will greatly change the dynamic characteristics of the vehicle body. The battery pack, as a mass point, is connected to the vehicle body longitudinal beam through a flexible mounting bracket, as Figure 1 shown. Therefore, the role of the battery pack is similar to that of a dynamic vibration absorber. The resonance principle of the dynamic vibration absorber is to transfer the vibration energy from the vehicle body to the mass point near the resonance frequency, thereby reducing the vehicle body vibration and interior noise. According to the vibration isolation principle, to reduce the reduction of the vehicle body vibration energy by the battery pack, it is required that the dynamic stiffness of the battery pack mounting point on the vehicle body side is large enough to effectively attenuate the vibration. Therefore, effectively improving the dynamic stiffness of the battery pack body mounting point is of great significance for improving the NVH performance of the whole vehicle.

[0003] The existing technology ignores the investigation of the dynamic stiffness of the vehicle body side of the battery pack mounting point, and only focuses on the investigation of the static stiffness. The so-called static stiffness refers to the ability to resist deformation under static load, generally measured by the deformation of the structure under static load; the so-called dynamic stiffness refers to the ability to resist deformation under dynamic load, generally measured by the natural frequency of the structure. The road surface excitation can be understood as random vibration input. The vibration energy is transmitted to the battery pack, and then the battery pack is transmitted to the vehicle body, which is a typical dynamic load. At the same time, combined with the actual vehicle tuning, simply investigating the static stiffness of the battery pack body side mounting point cannot comprehensively avoid the NVH risk of the whole vehicle. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides an installation structure of a new energy vehicle battery pack to achieve the purpose of meeting the dynamic stiffness effect and improving the NVH performance of the whole vehicle.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] The installation structure of the new energy vehicle battery pack includes a body floor, a body longitudinal beam, and a battery pack body. The body longitudinal beam is a hollow structure, and an installation structure is provided inside the hollow structure of the body longitudinal beam. The side part of the battery pack body is located directly below the body longitudinal beam, and fixing holes are provided on the side part of the battery pack body corresponding to the installation structure. The fixing holes are fixedly arranged in cooperation with the installation structure through fasteners.

[0007] Furthermore:

[0008] The upper part of the body longitudinal beam is welded to the body floor.

[0009] The installation structure is an installation threaded sleeve fixed inside the body longitudinal beam.

[0010] Installation strengthening plates are provided inside the body longitudinal beam corresponding to the installation structure.

[0011] The battery pack body includes a battery module and a battery bracket. The battery module is fixed above the battery bracket, and the fixing holes are provided on the side of the battery bracket.

[0012] The installation threaded sleeves inside the body longitudinal beam are a group arranged side by side at intervals along the longitudinal direction of the vehicle body.

[0013] The installation strengthening plate is a bent structure. The installation strengthening plate includes a bottom and a side part. The bottom is welded to the inner bottom surface of the body longitudinal beam in a fitting manner, and the side part is welded to the inner side wall of the body longitudinal beam in a fitting manner.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] The installation structure of the new energy vehicle battery pack is reasonably designed. The multi-point installation structure is provided inside the body longitudinal beam, and a strengthening structure is provided inside the body longitudinal beam corresponding to the installation points, effectively improving the stiffness and strength of the installation points; effectively suppressing the transmission of vibration energy of the battery pack to the vehicle interior, which is of great significance for improving the NVH performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0017] Figure 1 It is a schematic diagram of the battery pack of the present utility model installed on the vehicle body.

[0018] Figure 2 It is a schematic diagram of the installation structure of the battery pack of the present utility model.

[0019] Figure 3 It is a schematic diagram of the installation point structure of the present utility model.

[0020] Figure 4 It is a cross-sectional view of the installation point of the present utility model.

[0021] In the figure:

[0022] 1. Battery pack body, 2. Body floor, 3. Mounting point Ⅰ, 4. Mounting point Ⅱ, 5. Mounting point Ⅲ, 6. Mounting point Ⅳ, 7. Body longitudinal beam, 8. Mounting reinforcement plate, 9. Mounting threaded sleeve. Specific embodiments

[0023] The following further describes in detail the specific embodiments of the present utility model by describing the embodiments with reference to the accompanying drawings.

[0024] As Figures 1 to 4 shown, the installation structure of the new energy vehicle battery pack includes a body floor 2, a body longitudinal beam 7, and a battery pack body 1. The upper edge of the body longitudinal beam is welded to the body floor.

[0025] The body longitudinal beam 7 is a hollow structure. An installation structure is provided inside the hollow structure of the body longitudinal beam 7. The side part of the battery pack body is located directly below the body longitudinal beam. Fixing holes are provided on the side part of the battery pack body corresponding to the installation structure, and are fixedly arranged by passing fasteners through the fixing holes and cooperating with the installation structure.

[0026] The body longitudinal beam 7 is a bent longitudinal beam with an upper opening. Connecting flanges are provided at both sides of the top of the body longitudinal beam. The two connecting flanges are welded to the lower surface of the body floor in a fitting manner. The installation structure is an installation threaded sleeve 9 fixed inside the body longitudinal beam. The battery pack body is fixed by bolts, and the connection is simple.

[0027] An installation reinforcement plate 8 is provided inside the body longitudinal beam corresponding to the installation structure. The installation threaded sleeves inside the body longitudinal beam are a group arranged side by side at intervals along the vehicle longitudinal direction. The multi-point installation structure is provided inside the body longitudinal beam, and a reinforcement structure is provided inside the body longitudinal beam corresponding to the installation points, effectively improving the stiffness and strength of the installation points; effectively suppressing the transmission of vibration energy of the battery pack to the vehicle interior, which is of great significance for improving the NVH performance of the whole vehicle.

[0028] The installation and fixing structures on both sides of the battery pack body are the same and are symmetrically arranged. Four installation points are provided on each side of the battery pack body, that is, four installation points are provided inside the body longitudinal beam on each side, namely mounting point Ⅰ 3, mounting point Ⅱ 4, mounting point Ⅲ 5, and mounting point Ⅳ 6.

[0029] The battery pack body includes a battery module and a battery bracket. The battery module is fixed above the battery bracket, and the fixing holes are provided on the side of the battery bracket.

[0030] Preferably, the installation reinforcement plate is a bent structure. The installation reinforcement plate includes a bottom and a side part. The bottom is welded to the inner bottom surface of the body longitudinal beam in a fitting manner, and the side part is welded to the inner side wall of the body longitudinal beam in a fitting manner, and the structure is stable and reliable.

[0031] AsFigure 2 As shown, the reinforcement plate of the battery pack body side mounting point and the threaded sleeve of the battery pack body side mounting point are connected together by welding, and then further lapped with the vehicle body longitudinal beam through welding points. This structure forms a cavity in the longitudinal beam, effectively improving the stiffness and strength of this point. In summary, this patent designs a new mounting point structure in the vehicle body side longitudinal beam. This structure forms a cavity in the longitudinal beam, effectively improving the stiffness and strength of this point. Through simulation analysis and evaluation, with the setting of the four-mounting point structure, the dynamic stiffness is increased by 40%, and the vibration function from the four points to the interior of the vehicle is reduced by 20%. It effectively suppresses the transmission of vibration energy of the battery pack to the interior of the vehicle, which is of great significance for improving the NVH performance of the whole vehicle.

[0032] This patent aims to solve one of the technical problems existing in the prior art, and provides a structure for improving the NVH characteristics of the battery pack body side mounting point of new energy vehicles, which has the following two beneficial effects: 1. It significantly improves the dynamic stiffness of the battery pack body side mounting point, improves the vibration isolation ability, and enhances the NVH performance of the whole vehicle. 2. It significantly reduces the vibration transfer function from the battery pack body side mounting point to the interior of the vehicle, effectively suppresses the transmission of vibration energy of the battery pack to the interior of the vehicle, and improves the NVH performance of the whole vehicle.

[0033] The above is only an illustration of the preferred embodiments of the present utility model. The above technical features can be arbitrarily combined to form multiple embodiment schemes of the present utility model.

[0034] The present utility model has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the concept and technical solutions of the present utility model, or the concept and technical solutions of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A new energy vehicle battery pack installation structure, comprising a vehicle body floor, a vehicle body longitudinal beam and a battery pack body, characterized in that: The vehicle body longitudinal beam is a hollow structure, and a mounting structure is provided in the hollow structure of the vehicle body longitudinal beam. The side portion of the battery pack body is located directly below the vehicle body longitudinal beam. A fixing hole is provided on the side portion of the battery pack body corresponding to the mounting structure, and a fastener passes through the fixing hole and is fixed to the mounting structure.

2. The new energy vehicle battery pack installation structure as claimed in claim 1, characterized in that: The upper edge of the vehicle body longitudinal beam is connected to the vehicle body floor by welding.

3. The new energy vehicle battery pack installation structure as claimed in claim 1, characterized in that: The mounting structure is a mounting threaded sleeve fixed in the longitudinal beam of the vehicle body.

4. The new energy vehicle battery pack installation structure as claimed in claim 1, characterized in that: A mounting reinforcement plate is provided in the vehicle body longitudinal beam corresponding to the mounting structure.

5. The new energy vehicle battery pack installation structure as claimed in claim 1, characterized in that: The battery pack body comprises a battery module and a battery bracket. The battery module is fixed above the battery bracket, and the fixing holes are arranged on the edge of the battery bracket.

6. The new energy vehicle battery pack installation structure as claimed in claim 3, characterized in that: The installation threaded sleeves in the vehicle body longitudinal beam are arranged in a group in parallel and spaced relation along the longitudinal direction of the vehicle body.

7. The new energy vehicle battery pack installation structure as claimed in claim 4, characterized in that: The installation reinforcement plate is a bent structure and includes a bottom and a side portion. The bottom is welded to the inner bottom surface of the vehicle body longitudinal beam, and the side portion is welded to the inner side wall of the vehicle body longitudinal beam.

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