Battery pack protection structure

Abstract

A battery pack protection structure is provided, which comprises a bottom protection plate arranged on a chassis or a bottom plate of a battery pack, and a buffer mechanism arranged between the bottom plate and the bottom protection plate. The buffer mechanism comprises a buffer layer and a plurality of springs, the bottom of the spring is fixedly connected to the top surface of the bottom protection plate, and the top of the spring is fixedly connected to the bottom surface of the bottom plate. The buffer layer is fixedly arranged on the top surface of the bottom protection plate or the bottom surface of the bottom plate, and the hardness of the buffer layer is arranged in a gradient increasing manner along the thickness direction. The buffer mechanism can absorb and release the impact force during impact, avoid direct impact on the battery bottom plate, realize protection of the battery, and has the advantages of low price compared with the whole battery pack, low replacement and maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicle technology, and specifically relates to a battery pack protection structure. Background Technology

[0002] The battery pack is a core component of new energy vehicles, primarily responsible for storing and providing electrical energy. Due to the high economic value of battery packs, some new energy vehicles have chassis armor that provides some protection. However, when a vehicle is impacted, the chassis armor, being a rigid plate structure, can still cause localized damage to the battery pack when subjected to point impacts. Currently, battery packs on the market are designed for complete replacement to ensure safety and battery consistency, resulting in poor repair costs. Furthermore, localized damage to the battery pack can also pose safety hazards. As a result, current chassis armor on the market can no longer meet the protection requirements of new energy vehicles for their battery packs.

[0003] In addition, when the local area receives a point impact, the chassis armor will deform, requiring the chassis armor to be disassembled to inspect the battery pack body, making the repair process complicated.

[0004] The utility model disclosed in announcement number CN223457348U is an inner liner structure for a battery box tray. The key technical points include an outer battery box tray with an inner liner shell installed inside. The inner liner shell is placed inside the outer battery box tray, and a limiting block is moved into a fixing groove to restrict the inner liner shell within the outer battery box tray. When it is necessary to remove the inner liner shell from the outer battery box tray, the limiting block is moved out of the fixing groove to release the restriction. When the outer battery box tray is subjected to collision or vibration, the vibration force is transmitted to a telescopic rod through the outer battery box tray. As the telescopic rod slides into the contraction groove, it transmits the force to a first spring, thereby reducing the vibration intensity experienced by the inner liner shell. This is mainly achieved through side cushioning and shock absorption.

[0005] Utility model announcement CN216833182U discloses a battery pack protection structure and an automobile. Key technical features include a waterproof housing located at the bottom of the vehicle body, which surrounds the wiring harness and ports on the front side of the battery pack, as well as electrical components located at the bottom of the vehicle body. The waterproof housing has a first area. The mounting bracket for the front protection structure includes a first connecting section, a second connecting section, and a third connecting section arranged sequentially from bottom to top. The second connecting section protrudes outward and is located on one side of the first area. When the first area is impacted by water and deforms, the second connecting section can support the first area, preventing excessive deformation of the waterproof housing after water impact. It primarily protects the front side of the battery pack, the front protection structure, and the electrical components located at the bottom of the vehicle body from water splashes through the waterproof housing, but does not address shock absorption protection. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a battery pack buffer protection structure that prevents direct impact on the battery base plate and provides an early warning during a collision, thereby protecting the battery.

[0007] To solve the above technical problems, the technical solution adopted by this utility model is as follows: A battery pack protection structure includes a bottom guard plate connected to the bottom plate of a vehicle frame or battery pack via a fixing mechanism, and a buffer mechanism is provided between the bottom plate and the bottom guard plate. The buffer mechanism includes a buffer layer and several springs, with the bottom of the springs fixedly connected to the top surface of the bottom guard plate and the top of the springs fixedly connected to the bottom surface of the bottom plate. The buffer layer is fixed on the top surface of the bottom protective plate or the bottom surface of the bottom plate, and the hardness of the buffer layer increases in a gradient from top to bottom.

[0008] An early warning mechanism is also provided between the base plate and the bottom protective plate, and the early warning mechanism includes a first electrode fixed on the top surface of the bottom protective plate and a second electrode fixed on the bottom surface of the base plate. When the bottom guard plate and the bottom plate are relatively displaced, the first electrode and the second electrode make contact and conduction, triggering an alarm signal.

[0009] Reinforcing ribs are also fixedly connected to the bottom surface of the bottom guard plate.

[0010] The fixing mechanism includes a guide rod and a limiting block arranged at the lower end of the bottom guard plate. The first end of the guide rod is fixedly connected to the bottom plate of the vehicle frame or battery pack, while the last end of the guide rod passes through the bottom guard plate and is fixedly connected to the limiting block.

[0011] The limiting block is threadedly connected to the guide rod.

[0012] The first electrode is an electrode post, which is spaced apart on the top surface of the bottom protective plate, and the second electrode is the bottom surface of the bottom plate.

[0013] The strength of the electrode post is less than the strength of the base plate.

[0014] The reinforcing ribs are distributed in a grid pattern.

[0015] The beneficial effects of this utility model are: (1) The battery pack protection structure is provided by installing a bottom guard plate on the bottom plate of the vehicle frame or battery pack and setting a buffer mechanism between the bottom plate and the bottom guard plate. The buffer mechanism includes a buffer layer and several springs. The bottom of the springs is fixedly connected to the top surface of the bottom guard plate and the top of the springs is fixedly connected to the bottom surface of the bottom plate. The buffer layer is fixed on the top surface of the bottom guard plate or the bottom surface of the bottom plate. The hardness of the buffer layer is set to increase in a gradient along the thickness direction. It can absorb and release the impact force during the impact, avoid direct impact on the battery bottom plate, and achieve protection of the battery. Moreover, this device is cheaper and has lower replacement and maintenance costs compared to the whole battery pack.

[0016] (2) The warning mechanism and the buffer mechanism work together to provide warnings while buffering, providing collision warning information, improving safety and the maintenance economy of the whole vehicle; when the bottom guard plate is deformed, if the electrode post does not contact the bottom surface of the battery pack and the collision signal is not issued, it indicates that the battery pack body has not been hit, and only the bottom guard plate needs to be repaired, thus improving the maintenance economy of the whole vehicle.

[0017] (3) The reinforcing ribs are distributed in a grid pattern, which improves the bending stiffness of the bottom guard plate without significantly increasing the weight; the whole protective structure can significantly improve the safety and reliability of the electric vehicle power battery under complex working conditions; when the vehicle encounters unexpected bumps or bottoming out, the spring and buffer layer work together to effectively attenuate the impact load and prevent the battery pack bottom plate from plastic deformation or cracking due to instantaneous overstress, providing a key response time window for the safety control of the whole vehicle.

[0018] (4) Through the integrated design of multiple protection mechanisms, the protection structure achieves an optimized balance between lightweight and high safety, providing a reliable guarantee for the long-term stable operation of the battery pack under complex road conditions; the structure can also dynamically adjust the spring stiffness and preload according to the ground clearance of the bottom of the battery pack to adapt to the layout requirements of different vehicle models. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Enlarged schematic diagram of part A; Figure 3 This is a bottom view of the present invention. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] This utility model provides a battery pack protection structure, such as Figures 1 to 3 As shown.

[0022] A battery pack protection structure includes a bottom guard plate 2 connected to the bottom plate 1 of a vehicle frame or battery pack 11 via a fixing mechanism. A buffer mechanism 3 is also provided between the bottom plate 1 and the bottom guard plate 2. The buffer mechanism includes a buffer layer 31 and several springs 32. The bottom of the springs 32 is fixedly connected to the top surface of the bottom guard plate 2, and the top of the springs 32 is fixedly connected to the bottom surface of the bottom plate 1. The buffer layer 31 is fixedly disposed on the top surface of the bottom guard plate 2 or the bottom surface of the bottom plate 1, and the hardness of the buffer layer 31 is set to increase in a gradient along the thickness direction.

[0023] An early warning mechanism 4 is also provided between the base plate 1 and the base guard plate 2. The early warning mechanism includes a first electrode fixed on the top surface of the base guard plate and a second electrode fixed on the bottom surface of the base plate. When the base guard plate 2 and the base plate 1 undergo relative displacement, the first electrode and the second electrode make contact and conduction, triggering an alarm signal. In this embodiment, the first electrode is an electrode post 41, which is spaced apart on the top surface of the base guard plate, and the second electrode is the bottom surface of the base plate. The strength of the electrode post is less than the strength of the base plate.

[0024] To enhance structural strength, reinforcing ribs 5 are fixedly connected to the bottom surface of the bottom guard plate 2. The reinforcing ribs 5 are rectangular and distributed in a grid pattern, and are arranged in an X shape at the center of the bottom guard plate 2.

[0025] The fixing mechanism includes a guide rod 6 and a limiting block 7 arranged at the lower end of the bottom guard plate. The first end of the guide rod 6 is fixedly connected to the bottom plate of the vehicle frame or battery pack, while the end of the guide rod 6 passes through the bottom guard plate and is fixedly connected to the limiting block. For easy installation, the limiting block 7 is threadedly connected to the guide rod 6.

[0026] The following description, in conjunction with specific embodiments, provides further details: Four guide rods 6 are fixedly connected to the bottom surface of the battery pack base plate. After the guide rods 6 pass through the bottom guard plate below, they are fixedly connected to the limiting block 7 by threads. Alternatively, the guide rods 6 can be fixedly connected to the bottom of the frame, as long as the bottom guard plate covers the battery pack above.

[0027] Several springs 32 are fixedly connected between the bottom plate and the bottom protective plate of the battery pack 11. The springs are evenly distributed and absorb the impact force from the bottom protective plate to prevent direct impact on the bottom plate of the battery pack. The bottom of the bottom protective plate 2 has reinforcing ribs welded or integrally formed. The reinforcing ribs are rectangular and distributed in a grid pattern, with an X-shaped reinforcing rib in the center. The thickness of the reinforcing ribs can be 2mm, and the rectangular area covers 85% of the entire bottom area of ​​the bottom protective plate.

[0028] An elastic buffer layer is fixedly connected to the top surface of the bottom guard plate 2. The hardness of the buffer layer increases from top to bottom. When the impact force is too large and the bottom guard plate comes into contact with the bottom plate of the battery pack, the softer upper buffer layer 31 first absorbs the impact force, while the harder lower buffer layer and the bottom guard plate itself provide strength support, further realizing the function of absorbing and buffering the impact force. This forms a multi-absorption and multi-protection function with the spring absorbing the impact force. In some other embodiments, a buffer layer can also be added to the bottom of the spring.

[0029] To prevent the rigid spring from directly scratching the bottom plate of the battery pack, a buffer layer is fixedly connected to the top of the spring. This buffer layer further reduces the impact force of rigid objects on the bottom of the battery pack.

[0030] The warning mechanism 4, which is fixedly connected between the battery pack's base plate and the underbody plate, includes a first electrode fixedly connected to the top surface of the underbody plate and a second electrode with the battery pack's base plate as the electrode. The first electrode is an electrode post. When the underbody plate and the base plate experience relative displacement, the first electrode and the second electrode make contact and conduct, triggering an alarm signal. The warning mechanism and the buffer mechanism work together to provide a warning while buffering, offering impact warning information, improving safety and the overall vehicle's repair economy. If the electrode post does not contact the bottom surface of the battery pack when the underbody plate deforms, and no collision signal is issued, it indicates that the battery pack itself has not been impacted, and only the underbody plate needs to be repaired, improving the overall vehicle's repair economy.

[0031] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing this utility model and simplifying the description, and the above terms have no special meaning.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0033] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A battery pack protection structure, characterized in that: This includes a bottom guard plate that is connected to the base plate of the vehicle frame or battery pack via a fixing mechanism, and a buffer mechanism is also provided between the base plate and the bottom guard plate. The buffer mechanism includes a buffer layer and several springs, with the bottom of the springs fixedly connected to the top surface of the bottom guard plate and the top of the springs fixedly connected to the bottom surface of the bottom plate. The buffer layer is fixed on the top surface of the bottom protective plate or the bottom surface of the bottom plate, and the hardness of the buffer layer increases in a gradient from top to bottom.

2. The battery pack protection structure according to claim 1, characterized in that: An early warning mechanism is also provided between the base plate and the bottom protective plate, and the early warning mechanism includes a first electrode fixed on the top surface of the bottom protective plate and a second electrode fixed on the bottom surface of the base plate. When the bottom guard plate and the bottom plate are relatively displaced, the first electrode and the second electrode make contact and conduction, triggering an alarm signal.

3. The battery pack protection structure according to claim 1, characterized in that: Reinforcing ribs are also fixedly connected to the bottom surface of the bottom guard plate.

4. The battery pack protection structure according to claim 1, characterized in that: The fixing mechanism includes a guide rod and a limiting block arranged at the lower end of the bottom guard plate. The first end of the guide rod is fixedly connected to the bottom plate of the vehicle frame or battery pack, while the last end of the guide rod passes through the bottom guard plate and is fixedly connected to the limiting block.

5. The battery pack protection structure according to claim 4, characterized in that: The limiting block is threadedly connected to the guide rod.

6. The battery pack protection structure according to claim 2, characterized in that: The first electrode is an electrode post, which is spaced apart on the top surface of the bottom protective plate, and the second electrode is the bottom surface of the bottom plate.

7. A battery pack protection structure according to claim 6, characterized in that: The strength of the electrode post is less than the strength of the base plate.

8. The battery pack protection structure according to claim 3, characterized in that: The reinforcing ribs are distributed in a grid pattern.

Images