Battery box body of electric vehicle

Abstract

The invention discloses an electric vehicle battery box body, and relates to the field of batteries, the electric vehicle battery box body comprises a lower box body and an upper box body, the upper box body is detachably connected with the lower box body, the upper box body and the lower box body are combined to form an electrical cavity, the electrical cavity is used for installing battery cells, the upper box body and the lower box body are both provided with a plurality of ventilation grid openings, and the ventilation grid openings are communicated with the upper box body and the lower box body. The upper box body and the lower box body are each provided with filter cloth, the filter cloth covers the ventilation grid opening, and the filter cloth is used for filtering fine particulate matter in air. The battery box is provided with the ventilation grid openings, so that the heat dissipation efficiency of the battery box is improved. And the filter cloth can filter fine particulate matters in the air, so that the inner side of the electric cavity is kept clean.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery box for an electric vehicle. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The battery box is a component used for batteries in electric vehicles. The battery box provides a carrier for the battery to be installed and separates the battery from the external space, keeping the battery in a relatively clean environment. However, the space inside the battery box is relatively closed, which has an adverse effect on the heat dissipation during the battery operation process. Summary of the invention

[0004] In order to improve the heat dissipation efficiency of the battery while keeping the interior of the battery box clean, the present application provides an electric vehicle battery box.

[0005] The electric vehicle battery box provided in this application adopts the following technical solution: An electric vehicle battery box comprises a lower box and an upper box, wherein the upper box is detachably connected to the lower box, the upper box and the lower box are combined to form an electrical cavity, the electrical cavity is used to install battery cells, the upper box and the lower box are both provided with a plurality of ventilation openings, the upper box and the lower box are both provided with filter cloths, the filter cloths cover the ventilation openings, and the filter cloths are used to filter fine particulate matter in the air.

[0006] By adopting the above technical solution, an electrical cavity for accommodating battery cells is formed between the upper box and the lower box, and ventilation openings are provided on both the upper box and the lower box, which can enable air convection on the upper and lower sides of the battery box, so that the flowing air can take away the heat generated during the operation of the battery from the electrical cavity, thereby improving the heat dissipation efficiency of the battery box. The filter cloth can filter fine particulate matter (PM2.5) in the air, and the airflow is filtered by the filter cloth when entering the electrical cavity, so that the inside of the electrical cavity remains clean.

[0007] Optionally, the top wall of the upper box body is configured as a streamlined structure undulating along the longitudinal direction, and the top wall of the upper box body is arched upward.

[0008] By adopting the above technical solution, the top wall of the upper box body is set to a streamlined structure that undulates along the longitudinal direction. When the car is driving, the air flow velocity flowing through the top wall of the upper box body is higher than the air flow velocity flowing through the bottom wall of the lower box body, so that a pressure difference is formed between the air above the battery box body and the air below it, so that the air below the battery box body can be accelerated to flow to the top of the battery box body after passing through the electrical cavity.

[0009] Optionally, the air ventilation opening of the upper box body is an upper air ventilation opening, and the air ventilation opening of the lower box body is a lower air ventilation opening; the bottom wall of the lower box body is provided with two mutually parallel dividing ribs, and the area between the two dividing ribs in the electrical cavity serves as a battery installation area; the upper air ventilation opening is located above the battery installation area, and two groups of lower air ventilation openings are provided, and the two groups of lower air ventilation openings are respectively located on both sides of the battery installation area, and are staggered with respect to the horizontal position of the battery installation area.

[0010] By adopting the above technical solution, the lower ventilation vents are arranged on both sides of the battery installation area, so that the lower ventilation vents can be staggered with the battery cells to reduce the impact of the battery cells on the air circulation of the electrical cavity, which is conducive to ensuring the heat dissipation efficiency of the electrical cavity. The air below the battery box enters the electrical cavity from both sides of the battery box, and then flows horizontally for a certain distance before being discharged from the upper ventilation vents. In the process of air flowing horizontally, more battery cells can be cooled.

[0011] Optionally, a wind shield is further included, wherein the wind shield is detachably connected to the upper box body and is perpendicular to the longitudinal direction of the upper box body.

[0012] By adopting the above technical solution, when the wind shield is installed on the upper box body, the wind shield can hinder the gas flow on the top wall of the upper box body, so that the air flow speed above the battery box body is lower than the air flow speed below the battery box body, so that the air flow flows through the electrical box from top to bottom, so that the air flow can blow out the dust attached to the lower filter cloth.

[0013] Optionally, the filter cloth is located on the outside of the electrical cavity; the filter cloth located on the upper box body is the upper filter cloth, and the filter cloth located on the lower box body is the lower filter cloth. The top wall of the upper box body is detachably provided with a pressure ring, and the pressure ring and the upper box body jointly press the peripheral side edge of the upper filter cloth. When the lower box body is installed, it can press the peripheral side edge of the lower filter cloth downward.

[0014] By adopting the above technical solution, the upper filter cloth is installed and fixed by the pressing ring, and the lower filter cloth is installed and fixed by the gravity of the lower box body. The pressing ring can be removed from the upper box body, and the lower box body can be removed from the frame of the car, so that the upper filter cloth and the lower filter cloth can be removed and replaced.

[0015] Optionally, the pressing ring is connected to the upper box body via a threaded fastener, the pressing ring is provided with a first through hole for the threaded fastener to pass through, and the upper filter cloth is provided with a second through hole for the threaded fastener to pass through.

[0016] By adopting the above technical solution, the threaded fastener passes through the upper filter cloth, which is conducive to making the connection between the upper filter cloth and the upper box body more stable.

[0017] Optionally, a supporting foot is provided on the outer peripheral wall of the lower box body, and the bottom surface of the supporting foot and the bottom surface of the lower box body together serve as the supporting surface of the lower box body, and the supporting foot is provided with a bolt hole for threaded fasteners to pass through; a gasket groove is provided on the lower surface of the supporting foot, and the gasket groove is connected to the bolt hole, and a spring gasket is provided in the gasket groove of the supporting foot, and the spring gasket can force the supporting foot to be lifted upward.

[0018] By adopting the above technical solution, the support foot of the lower box body is locked and installed on the frame of the car by means of threaded fasteners, so that the bottom wall of the lower box body presses the lower filter cloth, and the spring pad is in a compressed and deformed state. When the threaded fasteners used to connect the support foot are loosened, the spring pad lifts the support foot upward, thereby reducing the pressure of the lower box body on the lower filter cloth, making it easier to pull out and replace the lower filter cloth. In addition, when replacing the lower filter cloth, tools such as crowbars and jacks can also be used to assist in lifting the battery box body.

[0019] Optionally, rollers are respectively provided at both ends of the lower filter cloth, and connecting seats are respectively provided at both ends of the rollers, and the connecting seats are used to connect to the lower box body or the frame of the car; one of the two rollers is set as a winding roller, and the other is set as an unwinding roller.

[0020] By adopting the above technical solution, both ends of the lower filter cloth can be rolled up by rollers. When installing the lower filter cloth, the excess length of filter cloth material is rolled up on the unwinding roller. When the ventilation efficiency of the unfolded part of the lower filter cloth is reduced due to dust blockage, the lower filter cloth is rolled up by the winding roller, and the unwinding roller is unwound, so that the new filter cloth material of the lower filter cloth replaces the original unfolded part to ensure the ventilation efficiency of the lower filter cloth. The unfolded part of the lower filter cloth can be updated and replaced, which is conducive to extending the replacement cycle of the lower filter cloth.

[0021] Optionally, Velcro is respectively provided at both ends of the lower filter cloth, and the Velcro includes a hook and barb piece and a plush piece, the hook and barb piece and the plush piece are respectively located on the surfaces of different sides of the lower filter cloth, the hook and barb piece and the plush piece are staggered along the length direction of the lower filter cloth, and the end of the lower filter cloth is connected by the Velcro to form a cylindrical portion that wraps the roller shaft; a first rubber damping layer is provided on the outer peripheral surface of the roller shaft, and a second rubber damping layer is provided at both ends of the lower filter cloth, and the second rubber damping layer is bonded to the first rubber damping layer.

[0022] By adopting the above technical solution, the two ends of the lower filter cloth are connected to form a cylindrical part that wraps the roller shaft by Velcro, so that the connection between the lower filter cloth and the roller shaft is more convenient. In addition, when the lower filter cloth needs to be replaced as a whole, the end of the lower filter cloth connected to the unwinding roller shaft is disassembled, and one end of the new lower filter cloth is connected by Velcro, and then the new lower filter cloth is rolled up and pulled by the winding roller shaft, so that one end of the new lower filter cloth passes through the bottom of the lower box body, and then the old lower filter cloth is removed from the winding roller shaft, and then the two ends of the new lower filter cloth are respectively connected to the winding roller shaft and the unwinding roller shaft.

[0023] Optionally, a spiral spring is connected between the connecting seat and the unwinding roller shaft, and the spiral spring is used to force the lower filter cloth to be tensioned.

[0024] By adopting the above technical solution, when the winding roller unwinds the cloth of the lower filter cloth, the vortex spring on the unwinding roller can force the cloth of the lower filter cloth to remain in a tensioned and flat state.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: An electrical cavity for accommodating battery cells is formed between the upper and lower boxes. Ventilation vents are provided on both the upper and lower boxes to allow air convection on the upper and lower sides of the battery box, so that the flowing air can take away the heat generated during the operation of the battery from the electrical cavity, thereby improving the heat dissipation efficiency of the battery box. The filter cloth can filter fine particles (PM2.5) in the air to keep the inside of the electrical cavity clean.

[0026] The top wall of the upper box body is configured as a streamlined structure that undulates in the longitudinal direction. When the vehicle is driving, the air flow velocity through the top wall of the upper box body is higher than the air flow velocity through the bottom wall of the lower box body, so that a pressure difference is formed between the air above the battery box body and the air below it, thereby enabling the air below the battery box body to accelerate through the electrical cavity and flow to the top of the battery box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0028] Figure 2 It is a cross-sectional view of the box body of Example 1.

[0029] Figure 3 It is an exploded view of Example 1.

[0030] Figure 4 yes Figure 3 Magnified view at A in the middle.

[0031] Figure 5 It is a schematic diagram of the overall structure of Example 2.

[0032] Figure 6 It is a schematic structural diagram of the unwinding roller in Example 2.

[0033] Figure 7 It is a structural schematic diagram of the box body in Example 3.

[0034] Figure 8 It is a schematic diagram of the overall structure of Example 4.

[0035] Description of reference numerals: 1. Box body; 11. Upper box; 111. Second through hole; 12. Lower box; 121. Separation rib; 122. Battery installation area; 13. Bolt and nut assembly; 14. Electrical cavity; 15. Ventilation air vent; 151. Upper ventilation air vent; 152. Lower ventilation air vent; 2. Filter cloth; 21. Upper filter cloth; 22. Lower filter cloth; 221. Velcro; 2211. Hook and barb sheet; 2212. Plush sheet; 3. Press Ring; 31, first through hole; 41, screw; 42, internal threaded sleeve; 5, supporting foot; 51, bolt hole; 52, gasket groove; 53, spring washer; 6, roller; 61, winding roller; 611, wrench position; 62, unwinding roller; 621, plug-in seam; 63, volute spring; 632, tubular portion; 64, set screw; 65, positioning bolt; 66, connecting seat; 8, windshield; 81, connecting plate. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail. Example 1

[0037] The present application embodiment discloses an electric vehicle battery box. Figure 1 , Figure 2 and Figure 3 The battery box of the electric vehicle includes a lower box 12 and an upper box 11. The upper box 11 and the lower box 12 are connected by a bolt and nut assembly 13 to form a box body 1. The upper box 11 and the lower box 12 are combined to form an electrical cavity 14. The electrical cavity 14 is used to install battery cells. The upper box 11 and the lower box 12 are both provided with a plurality of ventilation openings 15. The ventilation openings 15 of the upper box 11 are upper ventilation openings 151, and the ventilation openings 15 of the lower box 12 are lower ventilation openings 152. The position of the lower ventilation openings 152 corresponds to the gap between two adjacent battery cells; the upper box 11 and the lower box 12 are both provided with a filter cloth 2 for shielding the ventilation openings 15. The filter cloth 2 is located on the outside of the electrical cavity 14. The filter cloth 2 located on the upper box 11 is the upper filter cloth 21, and the filter cloth 2 located on the lower box 12 is the lower filter cloth 22.

[0038] The air in the electrical cavity 14 can be convected through the ventilation openings 15 to promote heat dissipation of the electrical cavity 14. The filter cloth 2 can filter fine particles in the air to keep the electrical cavity 14 clean.

[0039] Reference Figure 3 The upper housing 11 is provided with a pressing ring 3, and the pressing ring 3 and the upper housing 11 jointly press the peripheral edge of the upper filter cloth 21, and the pressing ring 3 and the upper housing 11 are connected by a threaded fastener, and the pressing ring 3 is provided with a first through hole 31 for the threaded fastener to pass through, and the upper filter cloth 21 is provided with a second through hole 111 for the threaded fastener to pass through, and a reinforcing edge line is sewn on the edge of the second through hole 111. The threaded fastener used to connect the pressing ring 3 and the upper housing 11 is a screw 41, and the upper housing 11 is fixedly provided with an internal threaded sleeve 42 adapted to the screw 41. The pressing ring 3 and the upper housing 11 jointly press the peripheral edge of the upper filter cloth 21, and the lower housing 12 can press the peripheral edge of the lower filter cloth 22 downward when the lower housing 12 is installed.

[0040] Reference Figure 3 and Figure 4 The outer peripheral wall of the lower box body 12 is provided with a support foot 5, and the bottom surface of the support foot 5 and the bottom surface of the lower box body 12 serve together as the support surface of the lower box body 12. The bottom surface of the support foot 5 and the peripheral edge of the bottom wall of the lower box body 12 can press the peripheral edge of the lower filter cloth 22. The support foot 5 is provided with a bolt hole 51 for threaded fasteners to pass through; the lower surface of the support foot 5 is provided with a gasket groove 52, which is connected to the bolt hole 51, and a spring washer 53 is provided in the gasket groove 52 of the support foot 5. The spring washer 53 in this embodiment is specifically a disc spring washer 53 ring. The spring washer 53 can force the support foot 5 to lift upward, so that the lower filter cloth 22 can be relatively easily drawn out from the bottom of the lower box body 12 for easy replacement.

[0041] Reference Figure 2 The top wall of the upper box body 11 is arranged as a streamlined structure undulating in the longitudinal direction, the top wall of the upper box body 11 is arched upward, and the longitudinal direction of the upper box body 11 is a direction parallel to the length direction of the vehicle body in the installed state.

[0042] The implementation principle of the battery box of the electric vehicle of the embodiment of the present application is as follows: an electrical cavity 14 for accommodating battery cells is formed between the upper box 11 and the lower box 12. When the car is moving, the flowing air passes through the top wall of the upper box 11 and the bottom wall of the lower box 12 at the same time. Since the top wall of the upper box 11 is set as an upwardly arched streamlined structure, the air flow velocity flowing through the top wall of the upper box 11 is higher than the air flow velocity flowing through the bottom wall of the lower box 12, so that the air above the battery box and the air below it form a pressure difference, so that the air below the battery box can be accelerated to flow to the top of the battery box after passing through the electrical cavity 14. The flowing air can take away the heat generated during the operation of the battery from the electrical cavity 14, which is beneficial to improve the heat dissipation efficiency of the battery box. In the process of the airflow entering the electrical cavity 14, it is filtered by the filter cloth 2, so that the inner side of the electrical cavity 14 remains clean. Example 2

[0043] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that rollers 6 are respectively provided at both ends of the lower filter cloth 22, and connecting seats 66 are respectively provided at both ends of the roller 6, and the connecting seats 66 are used to connect the lower box 12 or the frame of the car; one of the two rollers 6 is set as a winding roller 61, and the other is set as an unwinding roller 62. When installing the lower filter cloth 22, the excess length of the filter cloth 2 material is rolled up on the unwinding roller 62.

[0044] One end of the winding roller shaft 61 is provided with a wrench position 611 for a wrench to engage, so that the wrench can drive the winding roller shaft 61 to rotate, so that the winding roller shaft 61 can reel in the lower filter cloth 22. The winding roller shaft 61 can be additionally provided with a ratchet structure to enable the winding roller shaft 61 to achieve unidirectional rotation.

[0045] A volute spring 63 is connected between the connection seat 66 and the unwinding roller shaft 62, and the volute spring 63 is used to force the lower filter cloth 22 to be tensioned. An insertion seam 621 is provided on the outer circumference of the unwinding roller shaft 62, and the inner end of the volute spring 63 is plugged into the insertion seam 621. A set screw 64 is threadedly connected to the outer circumference of the unwinding roller shaft 62, and a connection hole for the set screw 64 to pass through is provided at the inner end of the volute spring 63; a positioning bolt 65 is threadedly connected to the connection seat 66, and the positioning bolt 65 is parallel to the unwinding roller shaft 62. The outer end of the volute spring 63 is curled to form a tubular portion 632 for the positioning bolt 65 to pass through, and the positioning bolt 65 is connected to the tubular portion 632 through a penetration.

[0046] Velcro 221 is respectively provided at both ends of the lower filter cloth 22, and the Velcro 221 includes a hook piece 2211 and a plush piece 2212. The hook piece 2211 and the plush piece 2212 are respectively located on the surfaces of different sides of the lower filter cloth 22, and the hook piece 2211 and the plush piece 2212 are staggered along the length direction of the lower filter cloth 22. The staggered distance between the hook piece 2211 and the plush piece 2212 is set with reference to the circumference of the roller 6. The ends of the lower filter cloth 22 are connected by Velcro 221 to form a cylindrical portion that wraps the roller 6; a first rubber damping layer is provided on the outer peripheral surface of the roller 6, and a second rubber damping layer is provided at both ends of the lower filter cloth 22, and the second rubber damping layer is bonded to the first rubber damping layer.

[0047] Under the premise that the support foot 5 of the lower box 12 is lifted upward, the winding roller 61 can be used to wind up the lower filter cloth 22, so that the filter cloth 2 material is continuously unwound from the unwinding roller 62. During this process, the spiral spring 63 on the unwinding roller 62 can keep the lower filter cloth 22 in a tensioned and flat state. When the ventilation efficiency of the unfolded portion of the lower filter cloth 22 is reduced due to dust blockage, the winding roller 61 is used to wind up the lower filter cloth 22, so that the unwinding roller 62 is unwound, and the new filter cloth 2 material of the lower filter cloth 22 replaces the original unfolded portion to ensure the ventilation efficiency of the lower filter cloth 22.

[0048] When the lower filter cloth 22 needs to be replaced as a whole, one end of the lower filter cloth 22 connected to the unwinding roller shaft 62 is removed, and one end of the new lower filter cloth 22 is connected by the Velcro 221, and then the new lower filter cloth 22 is rolled up and pulled by the winding roller shaft 61, so that one end of the new lower filter cloth 22 passes through the bottom of the lower box body 12, and then the old lower filter cloth 22 is removed from the winding roller shaft 61, and then the two ends of the new lower filter cloth 22 are respectively connected to the winding roller shaft 61 and the unwinding roller shaft 62. Example 3

[0049] Reference Figure 7 The difference between this embodiment and embodiment 1 is that the bottom wall of the lower box body 12 is provided with two mutually parallel partition ribs 121, and the area between the two partition ribs 121 in the electrical cavity 14 serves as the battery installation area 122; the upper air vents 151 are located above the battery installation area 122, and two groups of lower air vents 152 are provided, and the two groups of lower air vents 152 are respectively located on both sides of the battery installation area 122, and are staggered from the horizontal position of the battery installation area 122, that is, the lower air vents 152 are arranged between the partition ribs 121 and the side wall of the lower box body 12.

[0050] The lower vents can be staggered with the battery cells. The air below the battery box enters the electrical cavity 14 from both sides of the battery box, then flows horizontally for a certain distance before being discharged from the upper vents. During the horizontal flow of the air, more battery cells can be cooled. Example 4

[0051] Reference Figure 8 The difference between this embodiment and the first embodiment is that the electric vehicle battery box further comprises a windshield 8, and connecting plates 81 are respectively provided on both sides of the windshield 8, and the connecting plates 81 are provided with holes for screws 41 to penetrate, that is, the screws 41 used to connect the pressure ring 3 can also be used to fix the windshield 8. The windshield 8 is perpendicular to the longitudinal direction of the upper box body 11, and the windshield 8 is located at the arched position of the upper box body 11.

[0052] When the wind shield 8 is installed on the upper box body 11, the wind shield 8 can hinder the gas flow on the top wall of the upper box body 11, so that the air flow speed above the battery box body is lower than the air flow speed below the battery box body, so that the air flow flows through the electrical box from top to bottom, so that the air flow can blow out the dust attached to the lower filter cloth 22.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric vehicle battery box, characterized in that: The invention comprises a lower box body (12) and an upper box body (11), wherein the upper box body (11) and the lower box body (12) are detachably connected, and an electrical cavity (14) is formed between the upper box body (11) and the lower box body (12), and the electrical cavity (14) is used to install a battery cell, and the upper box body (11) and the lower box body (12) are both provided with a plurality of ventilation openings (15), and the upper box body (11) and the lower box body (12) are both provided with filter cloth (2), and the filter cloth (2) covers the ventilation openings (15), and the filter cloth (2) is used to filter fine particles in the air.

2. The electric vehicle battery box according to claim 1, characterized in that: The top wall of the upper box body (11) is arranged as a streamlined structure undulating in the longitudinal direction, and the top wall of the upper box body (11) is arched upwards.

3. The electric vehicle battery box according to claim 2, characterized in that: The ventilation vents (15) of the upper box body (11) are upper ventilation vents (151), and the ventilation vents (15) of the lower box body (12) are lower ventilation vents (152); the bottom wall of the lower box body (12) is provided with two mutually parallel partition ribs (121), and the area between the two partition ribs (121) in the electrical cavity (14) serves as a battery installation area (122); the upper ventilation vents (151) are located above the battery installation area (122), and two groups of lower ventilation vents (152) are provided, and the two groups of lower ventilation vents (152) are respectively located on both sides of the battery installation area (122) and are staggered with respect to the horizontal position of the battery installation area (122).

4. The electric vehicle battery box according to claim 2, characterized in that: It also comprises a wind shield (8), wherein the wind shield (8) is detachably connected to the upper box body (11), and the wind shield (8) is perpendicular to the longitudinal direction of the upper box body (11).

5. The electric vehicle battery box according to claim 1, characterized in that: The filter cloth (2) is located outside the electrical chamber (14); the filter cloth (2) located in the upper box body (11) is an upper filter cloth (21), and the filter cloth (2) located in the lower box body (12) is a lower filter cloth (22); a top wall of the upper box body (11) is detachably provided with a pressing ring (3); the pressing ring (3) and the upper box body (11) jointly press the peripheral edge of the upper filter cloth (21); and the lower box body (12) can press the peripheral edge of the lower filter cloth (22) downward when the lower box body (12) is in an installed state.

6. The electric vehicle battery box according to claim 5, characterized in that: The pressing ring (3) is connected to the upper box body (11) via a threaded fastener, the pressing ring (3) is provided with a first through hole (31) for the threaded fastener to pass through, and the upper filter cloth (21) is provided with a second through hole (111) for the threaded fastener to pass through.

7. The electric vehicle battery box according to claim 5, characterized in that: A supporting foot (5) is provided on the outer peripheral wall of the lower box body (12); the bottom surface of the supporting foot (5) and the bottom surface of the lower box body (12) together serve as a supporting surface of the lower box body (12); the supporting foot (5) is provided with a bolt hole (51) for a threaded fastener to pass through; a gasket groove (52) is provided on the lower surface of the supporting foot (5); the gasket groove (52) is communicated with the bolt hole (51); a spring gasket (53) is provided in the gasket groove (52) of the supporting foot (5); the spring gasket (53) can force the supporting foot (5) to lift upward.

8. The electric vehicle battery box according to claim 7, characterized in that: Rollers (6) are respectively provided at both ends of the lower filter cloth (22), and connecting seats (66) are respectively provided at both ends of the roller (6), and the connecting seats (66) are used to connect to the lower box (12) or the frame of the automobile; one of the two rollers (6) is set as a winding roller (61), and the other is set as an unwinding roller (62).

9. The electric vehicle battery box according to claim 8, characterized in that: Velcro (221) is respectively provided at both ends of the lower filter cloth (22), the Velcro (221) comprising a hook and thorn piece (2211) and a plush piece (2212), the hook and thorn piece (2211) and the plush piece (2212) are respectively located on the surface of different sides of the lower filter cloth (22), the hook and thorn piece (2211) and the plush piece (2212) are staggered along the length direction of the lower filter cloth (22), the end of the lower filter cloth (22) is connected through the Velcro (221) to form a cylindrical portion that wraps the roller shaft (6); a first rubber damping layer is provided on the outer peripheral surface of the roller shaft (6), and a second rubber damping layer is provided at both ends of the lower filter cloth (22), and the second rubber damping layer is bonded to the first rubber damping layer.

10. The electric vehicle battery box according to claim 8, characterized in that: A volute spring (63) is connected between the connecting seat (66) and the unwinding roller shaft (62), and the volute spring (63) is used to force the lower filter cloth (22) to be tensioned.

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