Bottom protection plate of power battery pack

Abstract

The utility model discloses a power battery pack bottom protection plate which comprises a protection plate body and is characterized in that the protection plate body is provided with a hollow cavity which is through front and back, N reinforcing ribs are arranged in the hollow cavity at intervals from left to right, and the N reinforcing ribs divide the hollow cavity into N + 1 independent filling chambers from left to right, each filling cavity is filled with an energy absorption component, the reinforcing ribs are obliquely arranged, the upper ends and the lower ends of the reinforcing ribs are connected with the upper inner end face and the lower inner end face of the hollow cavity respectively, and every two reinforcing ribs adjacent left and right are arranged in a mirror symmetry mode. The protective plate has the advantages that the structure is simple, the hollow cavity is formed in the protective plate body, so that the mass of the protective plate body is reduced, on the basis that the mass is reduced, the inclined reinforcing ribs are arranged in the hollow cavity and used for increasing the bending rigidity of the protective plate body, and therefore the protective performance is improved; the energy absorption component is used for enhancing the overall energy absorption effect.

Description

Technical Field

[0001] The utility model relates to the field of bottom protection of a battery pack of an electric vehicle, in particular to a bottom protection plate of a power battery pack. Background Art

[0002] The power battery pack is the core component of electric vehicles, consisting of many lithium-ion batteries. When these lithium-ion batteries collide with the bottom, the battery shell is easily deformed, causing short circuits or thermal runaway fires in module cells and other electrical components, seriously affecting passenger safety. Based on this, some vehicles will install a bottom protection plate at the bottom of the battery pack to protect the bottom of the battery pack to avoid the above situation. However, the bottom protection plates currently used are basically single aluminum plates or steel plates, with a relatively thick structure and a single energy absorption effect. The protection performance is average and will increase the weight of the vehicle body, which is contrary to the energy-saving and emission-reduction concept of electric vehicles. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a bottom protective plate of a power battery pack which has a simple structure, good protective performance and light weight and can meet the energy conservation and emission reduction requirements of electric vehicles.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A bottom protective plate of a power battery pack includes a protective plate body, wherein the protective plate body has a hollow cavity extending from front to back, wherein N reinforcing ribs are arranged at intervals from left to right in the hollow cavity, wherein the N reinforcing ribs divide the hollow cavity from left to right into N+1 independent filling chambers, wherein each of the filling chambers is filled with an energy absorbing component.

[0006] The reinforcing ribs are arranged obliquely, and the two adjacent reinforcing ribs are arranged in mirror symmetry. The oblique arrangement of the reinforcing ribs has better bending rigidity and protective performance, and the symmetry of the adjacent reinforcing ribs can better bear the force, so that the force is evenly transmitted to the protective plate body.

[0007] The angle between the reinforcing rib and the horizontal plane is 30°-90°. This angle design makes the overall bending stiffness and protection effect better. In addition, in the specific experimental process, we selected 30°, 45°, 60° and 90°, and the final results showed that 30° was the most preferred.

[0008] The energy absorbing member is a long rectangular block filled from front to back, the front end face of the energy absorbing member is flush with the front end face of the protective plate body, and the rear end face of the energy absorbing member is flush with the rear end face of the protective plate body. Experimental comparison shows that when the energy absorbing member is designed as a rectangle or a trapezoid with the same shape as the filling chamber, the two have equivalent effects, so the rectangle is relatively easier to process and saves materials.

[0009] The energy absorbing component is a porous core material foam aluminum. Foam aluminum is a base material of aluminum alloy with a foaming agent or gas blown in. The foaming agent is heated to decompose and generate gas. The gas expands to foam the base material. The foam metal obtained after cooling has good energy absorption performance. The use of foam aluminum for energy absorbing components can reduce the weight of the structure and effectively improve the energy absorption effect.

[0010] The material of the protective plate body is aluminum alloy. Here, 6 series aluminum alloy is selected, which has magnesium and silicon as main alloying elements and has the advantages of high strength, good corrosion resistance, good formability and processability.

[0011] The reinforcing ribs are integrally formed with the protective plate body through casting, and are easy to manufacture.

[0012] The material of the reinforcing rib is the same as that of the protective plate body, which is convenient for maintaining the integrity of the structure during processing, has a better protective effect, and also has the advantages of the body material.

[0013] The N reinforcement ribs are evenly spaced from left to right. The reinforcement ribs are evenly distributed, the force is evenly applied, and the protective performance is more stable.

[0014] Compared with the prior art, the advantages of the utility model are: simple structure, a hollow cavity in the protective plate body, which reduces the mass of the protective plate body, and on the basis of the mass reduction, reinforcing ribs are arranged in the hollow cavity to increase the bending stiffness of the protective plate body, thereby improving the protective performance, and an energy-absorbing component is filled in the independent filling chamber to enhance the overall energy-absorbing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a front structural schematic diagram of the utility model;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model without the energy absorbing component;

[0018] Figure 4 This is a front structural schematic diagram of the utility model with the energy absorbing component removed. Implementation

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] As shown in the figure, a bottom protective plate of a power battery pack includes a protective plate body 1, the protective plate body 1 has a hollow cavity (not marked in the figure) penetrating from front to back, N reinforcing ribs 2 are arranged at intervals from left to right in the hollow cavity, and the N reinforcing ribs 2 divide the hollow cavity from left to right into N+1 independent filling chambers 11, and each filling chamber 11 is filled with an energy absorbing component 3.

[0021] In this specific embodiment, the reinforcing ribs 2 are arranged obliquely, and the two adjacent reinforcing ribs 2 are arranged in mirror symmetry. The oblique arrangement of the reinforcing ribs 2 has better bending rigidity and protective performance, and the symmetry of the adjacent reinforcing ribs 2 can better withstand force, so that the force is evenly transmitted to the protective plate body.

[0022] In this specific embodiment, the angle between the reinforcing rib 2 and the horizontal plane is 30°-90°. This angle design makes the overall bending stiffness and protection effect better. In addition, in the specific experimental process, we selected 30°, 45°, 60° and 90°, and the final results showed that 30° was the most preferred.

[0023] In this specific embodiment, the energy absorbing member 3 is a long rectangular block filled from front to back, the front end face of the energy absorbing member 3 is flush with the front end face of the protective plate body 1, and the rear end face of the energy absorbing member 3 is flush with the rear end face of the protective plate body 1. Experimental comparison shows that when the energy absorbing member 3 is designed as a rectangle or a trapezoid with the same shape as the filling chamber, the two have equivalent effects, so relatively speaking, the rectangle is easier to process and saves materials.

[0024] In this specific embodiment, the energy absorbing member 3 is a porous core material foam aluminum. Foam aluminum is a base material of aluminum alloy with a foaming agent added or gas blown in. The foaming agent is heated to decompose and generate gas. The gas expands to foam the base material. The foam metal obtained after cooling has good energy absorption performance. The use of foam aluminum for the energy absorbing member 3 can reduce the weight of the structure and effectively improve the energy absorption effect.

[0025] In this specific embodiment, the material of the protective plate body 1 is aluminum alloy. Here, 6 series aluminum alloy is selected, which has magnesium and silicon as main alloying elements and has the advantages of high strength, good corrosion resistance, good formability and processability.

[0026] In this specific embodiment, the reinforcing ribs 2 are integrally formed with the protective plate body 1 by casting, which is easy to manufacture.

[0027] In this specific embodiment, the material of the reinforcing rib 2 is the same as that of the protective plate body 1. This facilitates maintaining the integrity of the structure during processing, provides a better protective effect, and also has the advantages of the body material.

[0028] In this specific embodiment, N reinforcing ribs 2 are evenly spaced from left to right. The reinforcing ribs 2 are evenly distributed, the force is evenly applied, and the protective performance is more stable.

Claims

1. A bottom protective plate of a power battery pack, comprising a protective plate body, characterized in that The protective plate body has a hollow cavity that passes through from front to back, and N reinforcing ribs are arranged at intervals from left to right in the hollow cavity. The N reinforcing ribs divide the hollow cavity from left to right into N+1 independent filling chambers, and each of the filling chambers is filled with an energy-absorbing component; the reinforcing ribs are arranged obliquely, and the two adjacent reinforcing ribs on the left and right are arranged in mirror symmetry; the energy-absorbing component is a long rectangular block filled and arranged from front to back, and the front end face of the energy-absorbing component is flush with the front end face of the protective plate body, and the rear end face of the energy-absorbing component is flush with the rear end face of the protective plate body; the N reinforcing ribs are evenly spaced from left to right.

2. A power battery pack bottom protection plate as claimed in claim 1, characterized in that The angle between the reinforcing rib and the horizontal plane is 30°-90°.

3. A power battery pack bottom protection plate as claimed in claim 1, characterized in that The energy absorbing component is porous core material foam aluminum.

4. A power battery pack bottom protection plate as claimed in claim 1, characterized in that The material of the protective plate body is aluminum alloy.

5. A power battery pack bottom protection plate as claimed in claim 1, characterized in that The reinforcing ribs are integrally formed with the protective plate body through casting.

6. A power battery pack bottom protection plate as claimed in claim 1 or 4, characterized in that The material of the reinforcing rib is the same as that of the protective plate body.

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