Electric vehicle battery box

Abstract

The present application discloses an electric vehicle battery case, which relates to the field of batteries, including a lower case and an upper case, wherein the upper case is detachably connected to the lower case, and the upper case and the lower case are combined to form an electrical cavity, and the electrical cavity is used to install battery cells, and the upper case and the lower case are both provided with a plurality of ventilation openings, and the upper case and the lower case are both provided with filter cloths, and the filter cloths cover the ventilation openings, and the filter cloths are used to filter fine particles in the air. The present application provides ventilation openings to improve the heat dissipation efficiency of the battery case. The filter cloths can filter fine particles in the air, so that the inner side of the electrical cavity remains 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 key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0003] The battery case is a component used for batteries in electric vehicles. It provides a mounting platform for the batteries and isolates them from the outside world, maintaining a relatively clean environment. However, the relatively enclosed space within the battery case adversely affects heat dissipation during battery operation. 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 solutions:

[0006] An electric vehicle battery case includes a lower case and an upper case, the upper case and the lower case are detachably connected, the upper case and the lower case are combined to form an electrical cavity, the electrical cavity is used to install battery cells, the upper case and the lower case are both provided with a plurality of ventilation vents, the upper case and the lower case are both provided with filter cloth, the filter cloth covers the ventilation vents, and the filter cloth is used to filter fine particulate matter in the air.

[0007] By adopting this technical solution, an electrical cavity for accommodating battery cells is formed between the upper and lower casings. Ventilation vents are also provided on both the upper and lower casings, enabling air convection between the upper and lower sides of the battery casing. This flowing air removes heat generated during battery operation from the electrical cavity, thereby improving the heat dissipation efficiency of the battery casing. The filter cloth filters fine particulate matter (PM2.5) in the air. Airflow is filtered by the cloth as it enters the electrical cavity, keeping the interior of the cavity clean.

[0008] Optionally, the top wall of the upper box body is configured as a streamlined structure that undulates in the longitudinal direction, and the top wall of the upper box body is arched upward.

[0009] 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 pass through the electrical cavity and then flow to the top of the battery box body.

[0010] Optionally, the ventilation vents of the upper box body are upper ventilation vents, and the ventilation vents of the lower box body are lower ventilation vents; 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 ventilation vents are located above the battery installation area, and the lower ventilation vents are provided with two groups, and the two groups of lower ventilation vents 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.

[0011] By adopting this technical solution, the lower ventilation vents are located on both sides of the battery mounting area, allowing them to be staggered with the battery cells. This reduces the impact of the battery cells on the air circulation in the electrical cavity, which helps ensure the heat dissipation efficiency of the electrical cavity. Air from below the battery case enters the electrical cavity from both sides, flows horizontally for a certain distance, and then exits through the upper vents. This horizontal flow of air cools a large number of battery cells.

[0012] Optionally, a wind shield is further included, which is detachably connected to the upper box body and is perpendicular to the longitudinal direction of the upper box body.

[0013] 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 from top to bottom through the electrical box, so that the air flow can blow out the dust attached to the lower filter cloth.

[0014] 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 edge of the upper filter cloth. When the lower box body is in the installed state, it can press the peripheral edge of the lower filter cloth downward.

[0015] 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. The pressing ring can be removed from the upper box, and the lower box can be removed from the car frame, so that the upper and lower filter cloths can be removed and replaced.

[0016] 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.

[0017] 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.

[0018] Optionally, the outer peripheral wall of the lower box body is provided with a supporting foot, 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; the lower surface of the supporting foot is provided with a gasket groove, 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 lift upward.

[0019] With this technical solution, the lower housing's support feet are securely fastened to the vehicle's frame using threaded fasteners, causing the bottom wall of the lower housing to press against the lower filter cloth, effectively compressing the spring pad. When the threaded fasteners connecting the support feet are loosened, the spring pad lifts the support feet upward, alleviating the pressure from the lower housing on the lower filter cloth and making it easier to remove and replace. Furthermore, tools such as a crowbar and a jack can be used to assist in lifting the battery housing when replacing the lower filter cloth.

[0020] Optionally, rollers are provided at both ends of the lower filter cloth, and connecting seats are provided at both ends of the rollers, and the connecting seats are used to connect to the lower box 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.

[0021] By adopting this technical solution, rollers can be used to rewind the lower filter cloth at both ends. When installing the lower filter cloth, excess filter cloth material is rewound onto the unwinding roller. If the ventilation efficiency of the unrolled portion of the lower filter cloth decreases due to dust clogging, the rewinding roller rewinds the lower filter cloth, unwinding the unwinding roller and allowing new filter cloth material to replace the previously unrolled portion, thus ensuring the lower filter cloth's ventilation efficiency. The unrolled portion of the lower filter cloth can be replaced, extending the replacement cycle of the lower filter cloth.

[0022] Optionally, Velcro is provided at both ends of the lower filter cloth, and the Velcro includes a hook and a thorn piece and a plush piece, the hook and the thorn piece and the plush piece are respectively located on the surfaces of different sides of the lower filter cloth, the hook and the thorn 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; the outer peripheral surface of the roller is provided with a first rubber damping layer, and the two ends of the lower filter cloth are provided with a second rubber damping layer, and the second rubber damping layer is bonded to the first rubber damping layer.

[0023] By adopting the above technical solution, the two ends of the lower filter cloth are connected to the cylindrical portion of the roller using Velcro, making the connection between the lower filter cloth and the roller 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 is removed and the end of the new lower filter cloth is connected using Velcro. The new lower filter cloth is then rewound and pulled by the rewinding roller, so that one end of the new lower filter cloth passes under the lower box. The old lower filter cloth is then removed from the rewinding roller, and the two ends of the new lower filter cloth are then connected to the rewinding roller and the unwinding roller respectively.

[0024] 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.

[0025] By adopting the above technical solution, when the winding roller unwinds the lower filter cloth, the vortex spring on the unwinding roller can force the lower filter cloth to maintain a tensioned and flat state.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] The electrical cavity for accommodating the battery cells is formed between the upper and lower cases. Ventilation vents are installed on both sides of the battery case, allowing air convection between the upper and lower sides. This flowing air removes heat generated by the battery cells from the electrical cavity, thereby improving the heat dissipation efficiency of the battery case. A filter cloth filters fine particulate matter (PM2.5) from the air, keeping the interior of the electrical cavity clean.

[0028] The top wall of the upper box body is configured as a streamlined structure that undulates longitudinally. When the car 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, causing a pressure difference 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

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0030] Figure 2 This is a cross-sectional view of the box body of Example 1.

[0031] Figure 3 This is an exploded view of Example 1.

[0032] Figure 4 yes Figure 3 Magnified view at point A in the middle.

[0033] Figure 5 It is a schematic diagram of the overall structure of Example 2.

[0034] Figure 6 It is a structural schematic diagram of the unwinding roller in Example 2.

[0035] Figure 7 It is a structural diagram of the box body in Example 3.

[0036] Figure 8 It is a schematic diagram of the overall structure of Example 4.

[0037] Description of reference numerals:

[0038] 1. Box body; 11. Upper box; 111. Second through hole; 12. Lower box; 121. Separator rib; 122. Battery installation area; 13. Bolt and nut assembly; 14. Electrical chamber; 15. Ventilation vent; 151. Upper ventilation vent; 152. Lower ventilation 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. Internally threaded sleeve; 5. Support foot; 51. Bolt hole; 52. Gasket groove; 53. Spring washer; 6. Roller; 61. Winding roller; 611. Wrench position; 62. Unwinding roller; 621. Joint; 63. Volute spring; 632. Tubular portion; 64. Set screw; 65. Positioning bolt; 66. Connecting seat; 8. Windshield; 81. Connecting plate. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-8 This application is described in further detail. Example 1

[0040] 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 body 12 and an upper box body 11. The upper box body 11 and the lower box body 12 are connected to form a box body main body 1 by a bolt and nut assembly 13. The upper box body 11 and the lower box body 12 are combined to form an electrical cavity 14. The electrical cavity 14 is used to install battery cells. The upper box body 11 and the lower box body 12 are both provided with a plurality of ventilation openings 15. The ventilation openings 15 of the upper box body 11 are upper ventilation openings 151, and the ventilation openings 15 of the lower box body 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 body 11 and the lower box body 12 are both provided with 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 body 11 is the upper filter cloth 21, and the filter cloth 2 located on the lower box body 12 is the lower filter cloth 22.

[0041] The air in the electrical cavity 14 can be convected through the ventilation vents 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.

[0042] Reference Figure 3 The upper housing 11 is provided with a pressing ring 3, which together with the upper housing 11 presses the peripheral edge of the upper filter cloth 21. The pressing ring 3 is connected to the upper housing 11 by a threaded fastener. The pressing ring 3 is provided with a first through hole 31 for the threaded fastener to pass through. The upper filter cloth 21 is provided with a second through hole 111 for the threaded fastener to pass through. 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 press the peripheral edge of the upper filter cloth 21 together. When the lower housing 12 is in the installed state, it can press the peripheral edge of the lower filter cloth 22 downward.

[0043] Reference Figure 3 and Figure 4 The outer peripheral wall of the lower housing 12 is provided with a support foot 5. The bottom surface of the support foot 5 and the bottom surface of the lower housing 12 jointly serve as the support surface of the lower housing 12. The bottom surface of the support foot 5 and the peripheral edge of the bottom wall of the lower housing 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. A spring washer 53 is provided in the gasket groove 52 of the support foot 5. In this embodiment, the spring washer 53 is specifically a disc spring washer 53. The spring washer 53 can force the support foot 5 to lift upward, so that the lower filter cloth 22 can be more easily pulled out from the bottom of the lower housing 12 for replacement.

[0044] Reference Figure 2 The top wall of the upper box body 11 is set to a streamlined structure that undulates along the longitudinal direction. The top wall of the upper box body 11 is arched upward. The longitudinal direction of the upper box body 11 is a direction parallel to the length direction of the car body in the installed state.

[0045] The implementation principle of the battery case of an electric vehicle in the embodiment of the present application is as follows: an electrical cavity 14 for accommodating battery cells is formed between the upper case 11 and the lower case 12. When the car is moving, the flowing air passes through the top wall of the upper case 11 and the bottom wall of the lower case 12 at the same time. Since the top wall of the upper case 11 is configured as an upwardly arched streamlined structure, the air flow velocity through the top wall of the upper case 11 is higher than the air flow velocity through the bottom wall of the lower case 12, so that a pressure difference is formed between the air above the battery case and the air below it, so that the air below the battery case can be accelerated to pass through the electrical cavity 14 and flow to the top of the battery case. The flowing air can remove the heat generated during the operation of the battery from the electrical cavity 14, which is beneficial to improving the heat dissipation efficiency of the battery case. In the process of the airflow entering the electrical cavity 14, it is filtered by the filter cloth 2, so that the inside of the electrical cavity 14 remains clean. Example 2

[0046] 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. The connecting seats 66 are used to connect to 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 wound on the unwinding roller 62.

[0047] 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 reels the lower filter cloth 22. The winding roller shaft 61 can be additionally provided with a ratchet structure so that the winding roller shaft 61 can achieve unidirectional rotation.

[0048] A scroll spring 63 is connected between the connecting seat 66 and the unwinding roller shaft 62. The scroll spring 63 is used to tension the lower filter cloth 22. The outer circumference of the unwinding roller shaft 62 is provided with a splice 621, and the inner end of the scroll spring 63 is plugged into the splice 621. A set screw 64 is threadedly connected to the outer circumference of the unwinding roller shaft 62, and the inner end of the scroll spring 63 is provided with a connection hole for the set screw 64 to pass through. A positioning bolt 65 is threadedly connected to the connecting seat 66. The positioning bolt 65 is parallel to the unwinding roller shaft 62. The outer end of the scroll spring 63 is curled to form a tubular portion 632 for the positioning bolt 65 to pass through. The positioning bolt 65 is connected to the tubular portion 632 through which it is inserted.

[0049] Velcro 221 is 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 end parts of the lower filter cloth 22 are connected by Velcro 221 to form a cylindrical part that wraps the roller 6; the outer peripheral surface of the roller 6 is provided with a first rubber damping layer, and the two ends of the lower filter cloth 22 are provided with a second rubber damping layer, and the second rubber damping layer is bonded to the first rubber damping layer.

[0050] When the support foot 5 of the lower housing 12 is lifted upward, the reel 61 can be used to reel in the lower filter cloth 22, allowing the filter cloth 2 to be continuously unwound from the unwinding roller 62. During this process, the vortex spring 63 on the unwinding roller 62 can keep the lower filter cloth 22 in a taut and flat state. When the ventilation efficiency of the unfolded portion of the lower filter cloth 22 is reduced due to dust blockage, the reel 61 is used to reel in the lower filter cloth 22, and the unwinding roller 62 is unwound, allowing the new filter cloth 2 of the lower filter cloth 22 to replace the previously unfolded portion, thereby ensuring the ventilation efficiency of the lower filter cloth 22.

[0051] When the lower filter cloth 22 needs to be replaced as a whole, the end of the lower filter cloth 22 connected to the unwinding roller 62 is removed, and one end of the new lower filter cloth 22 is connected through the Velcro 221. Then, the new lower filter cloth 22 is rolled up and pulled by the winding roller 61, so that one end of the new lower filter cloth 22 passes through the bottom of the lower box 12. Then, the old lower filter cloth 22 is removed from the winding roller 61, and then the two ends of the new lower filter cloth 22 are respectively connected to the winding roller 61 and the unwinding roller 62. Example 3

[0052] Reference Figure 7 The difference between this embodiment and Example 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 ventilation vents 151 are located above the battery installation area 122, and two groups of lower ventilation vents 152 are provided. 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, that is, the lower ventilation vents 152 are provided between the partition ribs 121 and the side wall of the lower box body 12.

[0053] 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 and is discharged from the upper vents. During the horizontal flow of air, more battery cells can be cooled. Example 4

[0054] Reference Figure 8 This embodiment differs from the first embodiment in that the electric vehicle battery case further includes a windshield 8 , with connecting plates 81 provided on either side thereof. The connecting plates 81 have holes for screws 41 to penetrate, meaning that the screws 41 used to connect the pressure ring 3 can also be used to secure the windshield 8 . The windshield 8 is perpendicular to the longitudinal direction of the upper case 11 and is located at the arched portion of the upper case 11 .

[0055] 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 from top to bottom through the electrical box, so that the air flow can blow out the dust attached to the lower filter cloth 22.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection 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; 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; the top wall of the upper box body (11) is arranged as a streamlined structure undulating in the longitudinal direction, 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, and the top wall of the upper box body (11) is arched upward.

2. The electric vehicle battery box according to claim 1, 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).

3. The electric vehicle battery box according to claim 1, 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).

4. 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.

5. The electric vehicle battery box according to claim 4, 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.

6. The electric vehicle battery box according to claim 4, 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.

7. The electric vehicle battery box according to claim 6, 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).

8. The electric vehicle battery box according to claim 7, 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.

9. The electric vehicle battery box according to claim 7, 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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