CN110660938A - Electric automobile battery box based on zero poisson's ratio material - Google Patents

Abstract

The invention discloses an electric vehicle battery box based on a zero Poisson's ratio material, which belongs to the field of new energy electric vehicles. Zero mechanical properties can better alleviate the damage and impact of the car on the battery when it is hit. The present invention includes an upper cover plate, an energy absorbing box body, a box body plate a, a box body plate b, and a lower bottom plate; the upper cover plate, two pieces of box body plates a, two pieces of box body plates b, and the lower bottom plate are assembled to form a box body , the energy-absorbing box body is located in the box; the energy-absorbing box body includes aluminum alloy heat-conducting plate, carbon fiber heat-absorbing plate, mixed Poisson's ratio three-dimensional structure material, upper cover plate of energy-absorbing box, aluminum alloy heat-absorbing plate close to the battery body, carbon fiber heat-absorbing plate The hot plate is close to the inner wall of the box plate a and the box plate b, and the three-dimensional structure material with zero Poisson's ratio is filled between the aluminum alloy heat-conducting plate and the carbon fiber heat-absorbing plate.

Description

An electric vehicle battery box based on zero Poisson's ratio material

technical field

The invention belongs to the field of new energy electric vehicles, in particular to an electric vehicle battery box based on a zero Poisson's ratio material.

Background technique

"Zero Poisson's ratio material" refers to a material in which the strain does not change in the direction perpendicular to the action of the load when the material is in tension or compression. Materials with "zero Poisson's ratio effect" are mostly used in situations that are sensitive to deformation in the unloaded direction or do not allow the strain to change in the unloaded direction. Since the material with "zero Poisson's ratio effect" is usually a honeycomb structure, it has better performance than general materials in terms of energy absorption and shock absorption.

Electric vehicle batteries are the source of power for electric vehicles. Once damaged, the normal driving of the vehicle will be seriously affected. When a normal car is hit by an accident, it is likely to affect the battery part. Therefore, it is necessary to use certain materials with superior performance to protect the battery and minimize the damage to the battery .

The existing protection solutions for electric vehicle batteries mainly focus on the selection of shell materials, and the selection of high-strength materials may lead to an increase in the overall quality of the battery box. In addition, most of the existing electric vehicle batteries reduce the damage caused by the collision to the internal battery module by setting a certain gap between the battery casing and the battery or between the battery and the battery. Once the collision is serious, it is difficult to guarantee. Does not affect the internal battery module.

SUMMARY OF THE INVENTION

The invention provides an electric vehicle battery box based on a zero Poisson's ratio material. The cell structure of a serpentine ring-shaped zero Poisson's ratio material is adopted. It can effectively alleviate the damage and impact on the battery when the car is hit.

To achieve the above object, the present invention adopts the following technical solutions:

An electric vehicle battery box based on zero Poisson's ratio material, comprising: an upper cover plate 1, an energy-absorbing box body 3, a box body plate a4, a box body plate b5, and a lower bottom plate 10; an upper cover plate 1, two boxes The board a4, the two box body boards b5, and the lower bottom plate 10 are assembled into a box body, and the energy absorption box body 3 is located in the box body; the energy absorption box body 3 includes an aluminum alloy heat conduction plate 11, a carbon fiber heat absorption plate 12, and a zero Poisson ratio The three-dimensional structural material 13, the upper cover plate 15 of the energy-absorbing box, the aluminum alloy heat-conducting plate 11 is close to the battery body, the carbon fiber heat-absorbing plate 12 is close to the inner wall of the box body plate a4 and the box body plate b5, the aluminum alloy heat-conducting plate 11 and the carbon fiber heat-absorbing plate A zero Poisson's ratio three-dimensional structural material 13 is filled between the plates 12 .

In the above structure, the upper cover plate 1 and the lower bottom plate 10 are both designed with grooves 6 which are matched with the battery, so as to facilitate the fixing and installation of the battery, and the upper cover plate 1 and the lower bottom plate 10 are designed with threaded holes 14 penetrating around them. , align with the threaded holes 14 on the box body plate a4 and the box body plate b5, and realize the assembly and cooperation of the upper cover plate 1 and the lower bottom plate 10 with the box body plate a4 and the box body plate b5 through the screws 2, and a rubber gasket is added in the middle. ; The lower base plate 10 is designed with a flange and a threaded hole 14 is designed on it, so that the lower base plate 10 can be easily installed on the vehicle body through the screws 2.

The two sides of the box body plate a4 and the box body plate b5 are designed with inclined short side plates 16, and both are designed with threaded holes 14. The installation of the two box body plates a4 and the two box body plates b5 is realized by the screws 2 and the nuts 8. , and a gasket is installed at the matching place, a water channel 17 is designed inside the box body plate a4 and the box body plate b5, and a water inlet 7 and a water outlet 9 are designed on the outside, and the water inlet 7 and the water outlet 9 are located at the opposite corners of the outer side of the box. The position of the line is convenient for the coolant to circulate inside the box plate, so as to effectively dissipate and cool the battery, and ensure that the battery works normally between its working temperature.

The energy-absorbing box body 3 is provided with six battery placement card slots. The outside of the energy-absorbing box body 3 is a carbon fiber heat absorbing plate. The inner card slot is surrounded by an aluminum alloy heat-conducting plate. . The battery placement card slot corresponds to the groove 6; the zero Poisson's ratio three-dimensional structural material 13 cell structure is a serpentine ring cell structure, and the serpentine ring cell structure is a center-symmetric structure, and each snake The ring-shaped cell consists of four 1/4 arcs, two semi-circles, and four horizontal sides, of which the four 1/4 arcs have the same radius, the two semi-circles have the same radius, and the four horizontal sides have the same length. The length of the serpentine ring cell is a=12mm-12.5mm. Each three-dimensional structural unit is composed of two serpentine ring cell structures intersecting at 90°, and the three-dimensional overall structure of the zero Poisson's ratio material is formed by the array of the structural unit in the two directions of X and Y. , filled inside the energy-absorbing box.

Beneficial effects: The present invention provides an electric vehicle battery box based on a zero Poisson's ratio material, which adopts a serpentine ring-type cell structure of a zero Poisson's ratio material, and each three-dimensional structural unit is composed of two serpentine rings. The formula cell structure is composed of a 90° intersection in the central axis, and then the three-dimensional overall structure of the zero Poisson's ratio material is formed by the array of the structural unit in the X and Y directions, which is filled inside the energy-absorbing box; The ring-type zero Poisson's ratio material is better than traditional materials in terms of energy absorption and shock absorption, and its mechanical properties of zero strain perpendicular to the load-bearing surface can better alleviate the damage to the battery when the car is hit and influences. The serpentine ring type zero Poisson's ratio material cell of the invention is simple to manufacture, and the process is relatively simple. Most of the aluminum alloy materials are used, the cost is relatively low, and the quality is lighter; and the upper and lower cover plates of the battery box are designed with battery modules. The card slot is arranged to make it easier to install and place the battery module.

Description of drawings

Figure 1 is the composition diagram of the battery box;

Fig. 2 is the contour parameter comparison diagram of serpentine ring cell;

Fig. 3 is a serpentine ring monolithic cell diagram;

Figure 4 is a basic three-dimensional structure diagram of a filled structure with zero Poisson's ratio material;

Figure 5 is an internal filling diagram of the energy-absorbing box;

In the figure, 1 is the upper cover plate, 2 is the screw, 3 is the energy-absorbing box, 4 is the box body plate a, 5 is the box body plate b, 6 is the groove, 7 is the water inlet, 8 is the nut, and 9 is the Water outlet, 10 is the lower bottom plate, 11 is an aluminum alloy heat-conducting plate, 12 is a carbon fiber heat absorbing plate, 13 is a three-dimensional structural material with zero Poisson’s ratio, 14 is a threaded hole, 15 is the upper cover plate of the energy-absorbing box, 16 is a short inclined The side plate and 17 are water channels.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

Example 1

As shown in Figure 1, an electric vehicle battery box based on zero Poisson's ratio material includes: an upper cover plate 1, an energy-absorbing box body 3, a box body plate a4, a box body plate b5, and a lower bottom plate 10; an upper cover plate 1. Two pieces of box body plate a4, two pieces of box body plate b5, and lower bottom plate 10 are assembled into a box body, and the energy-absorbing box body 3 is located in the box body; the energy-absorbing box body 3 includes an aluminum alloy heat-conducting plate 11 and a carbon fiber heat-absorbing plate 12. Mixed Poisson’s ratio three-dimensional structural material 13. The upper cover of the energy absorption box, the aluminum alloy heat conduction plate 11 is close to the battery body, the carbon fiber heat absorption plate 12 is close to the inner wall of the box plate a4 and the box plate b5, and the aluminum alloy heat conduction plate A zero Poisson's ratio three-dimensional structural material 13 is filled between 11 and the carbon fiber heat absorbing plate 12 .

In the above structure, the upper cover plate 1 and the lower bottom plate 10 are both designed with grooves 6 which are matched with the battery, so as to facilitate the fixing and installation of the battery, and the upper cover plate 1 and the lower bottom plate 10 are designed with threaded holes 14 penetrating around them. , align with the threaded holes 14 on the box body plate a4 and the box body plate b5, and realize the assembly and cooperation of the upper cover plate 1 and the lower bottom plate 10 with the box body plate a4 and the box body plate b5 through the screws 2, and a rubber gasket is added in the middle. ; The lower base plate 10 is designed with a flange and a threaded hole 14 is designed on it, so that the lower base plate 10 can be easily installed on the vehicle body through the screws 2.

The two sides of the box body plate a4 and the box body plate b5 are designed with inclined short side plates 16, and both are designed with threaded holes 14. The installation of the two box body plates a4 and the two box body plates b5 is realized by the screws 2 and the nuts 8. , and a gasket is installed at the matching place, a water channel 17 is designed inside the box body plate a4 and the box body plate b5, and a water inlet 7 and a water outlet 9 are designed on the outside, and the water inlet 7 and the water outlet 9 are located at the opposite corners of the outer side of the box. The position of the line is convenient for the coolant to circulate inside the box plate, so as to effectively dissipate and cool the battery, and ensure that the battery works normally between its working temperature.

The energy-absorbing box body 3 is provided with six battery placement card slots. The outside of the energy-absorbing box body 3 is a carbon fiber heat absorbing plate. The inner card slot is surrounded by an aluminum alloy heat-conducting plate. . The battery placement slot corresponds to the groove 6; the 13-cell structure of the zero Poisson's ratio three-dimensional structural material is a serpentine ring cell structure, as shown in Figure 4, the serpentine ring cell structure is the center Symmetrical structure, each serpentine ring cell consists of four 1/4 arcs, two semi-circular arcs, and four horizontal sides, of which four 1/4 arcs have the same radius, and two semi-circular arcs have the same radius. The lengths of the four transverse sides are the same, and each three-dimensional structural unit is composed of two serpentine ring-shaped cell structures intersecting at 90°, and then a zero Poisson is formed by the array of the structural unit in the two directions of X and Y. The three-dimensional overall structure of the material is filled inside the energy-absorbing box.

As shown in Figure 2, the design parameters corresponding to the contour curve of the serpentine ring zero Poisson's ratio cell 1/4 are the length a=12mm, b=2mm, the two arc radii R1=2mm, R2=1mm, The wall thickness t of each component is 1mm, and the height h is 1.5mm.

A battery placement card slot is arranged inside the box, and six battery modules can be placed inside each box. The wall thickness of the card slot is set to 8mm, and the energy-absorbing box around the battery is composed of aluminum alloy heat-absorbing plate, carbon fiber heat-absorbing plate and zero Poisson's ratio filling material. The thickness t1 of the aluminum alloy heat-absorbing plate is designed to be 5mm, and the carbon fiber heat-absorbing plate is designed to be 10mm. The design parameters of the battery box are designed in strict accordance with the national standard, and the material is aluminum alloy.

Example 2

As shown in Figure 1, an electric vehicle battery box based on zero Poisson's ratio material includes: an upper cover plate 1, an energy-absorbing box body 3, a box body plate a4, a box body plate b5, and a lower bottom plate 10; an upper cover plate 1. Two pieces of box body plate a4, two pieces of box body plate b5, and lower bottom plate 10 are assembled into a box body, and the energy-absorbing box body 3 is located in the box body; the energy-absorbing box body 3 includes an aluminum alloy heat-conducting plate 11 and a carbon fiber heat-absorbing plate 12. Mixed Poisson’s ratio three-dimensional structural material 13. The upper cover of the energy absorption box, the aluminum alloy heat conduction plate 11 is close to the battery body, the carbon fiber heat absorption plate 12 is close to the inner wall of the box plate a4 and the box plate b5, and the aluminum alloy heat conduction plate A zero Poisson's ratio three-dimensional structural material 13 is filled between 11 and the carbon fiber heat absorbing plate 12 .

In the above structure, the upper cover plate 1 and the lower bottom plate 10 are both designed with grooves 6 which are matched with the battery, so as to facilitate the fixing and installation of the battery, and the upper cover plate 1 and the lower bottom plate 10 are designed with threaded holes 14 penetrating around them. , align with the threaded holes 14 on the box body plate a4 and the box body plate b5, and realize the assembly and cooperation of the upper cover plate 1 and the lower bottom plate 10 with the box body plate a4 and the box body plate b5 through the screws 2, and a rubber gasket is added in the middle. ; The lower base plate 10 is designed with a flange and a threaded hole 14 is designed on it, so that the lower base plate 10 can be easily installed on the vehicle body through the screws 2.

The two sides of the box body plate a4 and the box body plate b5 are designed with inclined short side plates 16, and both are designed with threaded holes 14. The installation of the two box body plates a4 and the two box body plates b5 is realized by the screws 2 and the nuts 8. , and a gasket is installed at the matching place, a water channel 17 is designed inside the box body plate a4 and the box body plate b5, and a water inlet 7 and a water outlet 9 are designed on the outside, and the water inlet 7 and the water outlet 9 are located at the opposite corners of the outer side of the box. The position of the line is convenient for the coolant to circulate inside the box plate, so as to effectively dissipate and cool the battery, and ensure that the battery works normally between its working temperature.

The energy-absorbing box body 3 is provided with six battery placement card slots. The outside of the energy-absorbing box body 3 is a carbon fiber heat absorbing plate. The inner card slot is surrounded by an aluminum alloy heat-conducting plate. . The battery placement slot corresponds to the groove 6; the 13-cell structure of the zero Poisson's ratio three-dimensional structural material is a serpentine ring cell structure, as shown in Figure 4, the serpentine ring cell structure is the center Symmetrical structure, each serpentine ring cell consists of four 1/4 arcs, two semi-circular arcs, and four horizontal sides, of which four 1/4 arcs have the same radius, and two semi-circular arcs have the same radius. The lengths of the four transverse sides are the same, and each three-dimensional structural unit is composed of two serpentine ring-shaped cell structures intersecting at 90°, and then a zero Poisson is formed by the array of the structural unit in the two directions of X and Y. The three-dimensional overall structure of the material is filled inside the energy-absorbing box.

As shown in Fig. 2, the design parameters corresponding to the profile curve of 1/4 of the serpentine ring zero Poisson's ratio cell are length a=12.5mm, b=2mm, two arc radii R1=2mm, R2=1mm , the wall thickness t of each component is 1mm, and the height h is 1.5mm.

A battery placement card slot is arranged inside the box, and six battery modules can be placed inside each box. The wall thickness of the card slot is set to 8mm, and the energy-absorbing box around the battery is composed of aluminum alloy heat-absorbing plate, carbon fiber heat-absorbing plate and zero Poisson's ratio filling material. The thickness t1 of the aluminum alloy heat-absorbing plate is designed to be 5mm, and the carbon fiber heat-absorbing plate is designed to be 10mm. The design parameters of the battery box are designed in strict accordance with the national standard, and the material is aluminum alloy.

The above are only some embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. An electric vehicle battery box based on a zero Poisson ratio material is characterized by comprising an upper cover plate (1), an energy absorption box body (3), a box body plate a (4), a box body plate b (5) and a lower bottom plate (10); the energy absorption box comprises an upper cover plate (1), two box body plates a (4), two box body plates b (5) and a lower bottom plate (10), wherein the upper cover plate, the two box body plates a (4), the two box body plates b (5) and the lower bottom plate (10) are assembled into a box body, and an energy absorption box body (3) is positioned in the; the energy-absorbing box body (3) comprises an aluminum alloy heat-conducting plate (11), a carbon fiber heat-absorbing plate (12), a mixed Poisson ratio three-dimensional structure material (13) and an energy-absorbing box upper cover plate (15), wherein the aluminum alloy heat-conducting plate (11) is tightly attached to the battery body, the carbon fiber heat-absorbing plate (12) is tightly attached to the inner walls of a box body plate a (4) and a box body plate b (5), and the zero Poisson ratio three-dimensional structure material (13) is filled between the aluminum alloy heat-conducting plate (11) and the.

2. The battery box of the electric vehicle based on the zero-Poisson-ratio material as claimed in claim 1, wherein the cellular structure of the zero-Poisson-ratio three-dimensional structural material (13) is a serpentine ring cellular structure, the serpentine ring cellular structure is a central symmetrical structure, each serpentine ring cellular structure is composed of four 1/4 circular arcs, two semi-circular arcs and four transverse edges, each three-dimensional structural unit is composed of two serpentine ring cellular structures which are crossed at 90 degrees, and then a three-dimensional overall structure of the zero-Poisson-ratio material is composed by arrays of the structural units in the X and Y directions and is filled in the energy absorption box.

3. The zero-poisson's ratio material-based electric vehicle battery box of claim 2, wherein the four 1/4 circular arc radii are the same, the two semi-circular arc radii are the same, the four transverse edges are the same, and the serpentine ring cell length a =12mm-12.5 mm.

4. The battery box of the electric vehicle based on the zero Poisson ratio material as claimed in claim 1, wherein six battery mounting slots are arranged in the energy absorption box body (3), a carbon fiber heat absorption plate is arranged on the outer side of the energy absorption box body (3), the inner slots are surrounded by an aluminum alloy heat conduction plate, an upper cover plate (15) of the energy absorption box is also made of aluminum alloy, and the battery mounting slots correspond to the grooves (6).

5. The battery box of the electric vehicle based on the zero-Poisson ratio material as claimed in claim 1, wherein the upper cover plate (1) and the lower base plate (10) are both designed with grooves (6) matched with the battery, threaded holes (14) penetrating through the upper cover plate (1) and the lower base plate (10) are designed on the periphery and are aligned with the threaded holes (14) on the box body plate a (4) and the box body plate b (5), and the assembly and matching of the upper cover plate (1) and the lower base plate (10) with the box body plate a (4) and the box body plate b (5) are realized through screws (2).

6. The battery box of electric vehicle based on zero Poisson's ratio material as claimed in claim 5, characterized in that rubber gaskets are added between the upper cover plate (1), the lower base plate (10) and the box body plates a (4) and b (5).

7. The battery box of electric vehicle based on zero Poisson ratio material according to claim 1 or 5, characterized in that the lower base plate (10) is designed with a flange and a threaded hole (14) thereon, so that the lower base plate (10) is mounted on the vehicle body by a screw (2).

8. The battery box of the electric vehicle based on the zero-Poisson ratio material as claimed in claim 1, wherein the two sides of the box body plates a (4) and b (5) are designed with inclined short side plates (16) and threaded holes (14), the two box body plates a (4) and b (5) are installed through screws (2) and nuts (8), and the matching parts are installed with gaskets.

9. The battery box of electric vehicle based on zero Poisson ratio material as claimed in claim 1, wherein the box body plate a (4) and the box body plate b (5) are respectively designed with water channels (17) inside, and the outer sides of the box body plate a (4) and the box body plate b (5) are designed with a water inlet (7) and a water outlet (9).

10. Electric vehicle battery box based on zero poisson's ratio material according to claim 9, characterised by that the water inlet (7) and the water outlet (9) are located diagonally outside the box.

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