An electric vehicle with a protective device
Patent Information
- Application Number
- CN202522308198.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-10-31
AI Technical Summary
[0004]本实用新型的目的在于至少解决现有技术中存在的技术问题之一，提供一种具有防护装置的电动车，能够解决单层外壳长期承受车辆行驶过程中的振动、颠簸，以及外部石子撞击、环境腐蚀等作用，易出现外壳开裂、密封条老化变形等问题，导致防水性能逐渐下降，难以长期维持稳定的防水效果的问题
1、该具有防护装置的电动车，通过“内层密封和外层防护”的双层防水设计，有效解决背景技术中“单层外壳防水易因开裂、密封失效导致水分侵入”的缺陷；内层中，电池箱与箱盖扣合时，密封圈放置槽对第一密封圈形成限位，第一密封圈被挤压后形成紧密的环形密封带，直接阻断水分接触电池组；外层中，电池防护箱与防护箱盖配合，第二密封圈形成二次密封；即便外层电池防护箱因长期使用出现微小破损，内层第一密封圈仍能维持电池组核心区域的密封状态，双重屏障大幅提升防水可靠性，确保电动车在雨天行驶、洗车喷淋等场景下，电池组不会因水分侵入引发短路、电芯衰减等问题。
Smart Images
Figure CN224645031U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric vehicle technology, and in particular to an electric vehicle with a protective device. Background Technology
[0002] With the rapid development of the new energy industry, electric vehicles, thanks to their clean and environmentally friendly advantages, have been widely used in daily commuting, logistics transportation, and other fields. As the core power source of electric vehicles, the battery pack's operational stability and safety directly determine the vehicle's performance and lifespan. Waterproofing is one of the key factors ensuring stable battery pack operation. During daily driving, electric vehicles often face scenarios such as rain, road splashes, and car wash sprays. If the battery pack's waterproofing measures are insufficient, water can easily seep into the battery pack, causing short circuits in individual cells, performance degradation, and in severe cases, even battery fires and explosions, posing a threat to the personal safety and property of users.
[0003] Currently, most electric vehicle battery packs on the market employ a combination design of a "single-layer shell and sealant" for waterproofing: a metal or plastic shell is placed outside the battery pack, and rubber sealing strips and sealant are applied at the seams to prevent moisture intrusion. However, a single-layer shell is susceptible to cracking and aging of the sealing strips due to the vibrations and bumps during vehicle operation, as well as impacts from stones and environmental corrosion. This leads to a gradual decline in waterproofing performance and makes it difficult to maintain a stable waterproofing effect over the long term. Therefore, this invention proposes a novel solution. Utility Model Content
[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide an electric vehicle with a protective device that can solve the problem that a single-layer shell is prone to cracking and aging and deformation of the sealing strip when subjected to vibration and bumps during vehicle operation, as well as external stone impacts and environmental corrosion, which leads to a gradual decline in waterproof performance and difficulty in maintaining a stable waterproof effect for a long time.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric vehicle with a protective device, comprising an electric vehicle body and a battery pack compartment, wherein the electric vehicle body is composed of wheels, a frame, a drive assembly, a steering assembly, and a brake assembly; the outer shell of the battery pack compartment is fixedly connected to the frame of the electric vehicle body; A battery protection assembly is located inside the battery pack compartment and includes a battery protection box. The battery protection box is fixedly connected to the electric vehicle body. The upper end of the battery protection box is snapped with a protective box cover. The protective box cover and the battery protection box are fixed with bolts. A second sealing ring is provided between the protective box cover and the battery protection box. The battery box is installed inside the battery protection box. The top of the battery box is fitted with a cover, and the upper edge of the battery box protrudes outward. There are two sealing ring placement slots at the top of the battery box, and the first sealing ring is fitted into the inside of each of the two sealing ring placement slots. A connecting block is fixedly connected to the surface of the cover. A threaded rod is connected to the inside of the connecting block. A limit block is slidably connected inside the connecting block. The upper end of the limit block on the side near the battery box is inclined.
[0006] Preferably, the number of connecting blocks, threaded rods and limiting blocks is eight sets, which are symmetrically arranged on the outside of the box cover.
[0007] Preferably, a protective plate is fixedly connected to the bottom surface inside the battery pack compartment.
[0008] Preferably, a battery box support pad is fixedly connected to the bottom surface inside the battery protective box, and a battery box pressure plate is fixedly connected to the lower end of the protective box cover.
[0009] Preferably, the battery protection box is provided with a battery box limiting plate inside, and two dampers are fixedly connected to the inner wall of the battery protection box, and a return spring is sleeved on the surface of each of the two dampers. The two ends of the two dampers and the two return springs are respectively installed on the inner wall of the battery protection box and the battery box limit plate.
[0010] Preferably, there are four sets of the battery box limiting plate, damper, and return spring.
[0011] Preferably, a cover connecting ring is fixedly connected to the lower end of the protective cover.
[0012] Preferably, the upper ends of the four battery box limiting plates are curved outwards.
[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This electric vehicle with a protective device effectively solves the defect in the background technology that "single-layer waterproof outer shell is prone to water intrusion due to cracking and sealing failure" through a double-layer waterproof design of "inner sealing and outer protection". In the inner layer, when the battery box and the box cover are fastened, the sealing ring placement groove limits the first sealing ring. After the first sealing ring is squeezed, it forms a tight annular sealing band, directly blocking water from contacting the battery pack. In the outer layer, the battery protective box and the protective box cover cooperate, and the second sealing ring forms a secondary seal. Even if the outer battery protective box is slightly damaged due to long-term use, the inner first sealing ring can still maintain the sealing state of the core area of the battery pack. The double barrier greatly improves the waterproof reliability and ensures that the battery pack will not cause short circuits or cell degradation due to water intrusion in scenarios such as driving in the rain or being sprayed during car washes.
[0014] 2. This electric vehicle equipped with a protective device uses a connecting ring fixed at the lower end of the protective cover to form an annular groove with the side wall of the protective cover, precisely limiting the position of the second sealing ring; at the same time, the sealing ring placement groove on the battery box fixes the first sealing ring; during assembly, the second sealing ring will not shift due to uneven bolt tightening or vehicle vibration, and the first sealing ring will not fall off due to opening and closing of the cover, ensuring that the two sealing strips always maintain a complete and uniform sealing state, and can maintain a stable waterproof effect even after long-term use, avoiding safety hazards caused by the displacement of the seals. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of an electric vehicle structure with a protective device according to the present invention; Figure 2 This is a schematic diagram of the protective plate of this utility model; Figure 3 This is a schematic diagram of the battery protection box of this utility model; Figure 4 This is a schematic diagram of the battery box of this utility model; Figure 5 This is a schematic diagram of the first sealing ring of this utility model; Figure 6 This is a schematic diagram of the box cover connecting ring of this utility model; Figure 7 This is a schematic diagram of the battery box limiting plate of this utility model; Figure 8 This is a schematic diagram of the limiting block of this utility model; Figure 9 This utility model Figure 4 Enlarged diagram of point A in the middle.
[0016] Reference numerals in the attached drawings: 1. Electric vehicle body; 2. Battery pack compartment; 3. Battery protective box; 4. Protective plate; 5. Protective box cover; 6. Battery box pressure plate; 7. Battery box support pad; 8. Battery box; 9. Box cover; 10. Battery box limiting plate; 11. Damper; 12. Return spring; 13. Connecting block; 14. Sealing ring placement groove; 15. First sealing ring; 16. Second sealing ring; 17. Box cover connecting ring; 18. Threaded rod; 19. Limiting block. Detailed Implementation
[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.
[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0021] Please see Figure 1-9 This utility model provides a technical solution: an electric vehicle with a protective device, wherein the frame of the electric vehicle body 1 is fixedly connected to the inside of the battery pack compartment 2. This connection method is stable and reliable, ensuring that the battery pack compartment 2 will not shake during vehicle operation, and providing a stable installation foundation for subsequent battery protection components; the bottom surface inside the battery pack compartment 2 is fixedly connected to the protective plate 4. The protective plate 4 is made of wear-resistant and impact-resistant material, which can directly block stones and debris flying from the ground from impacting the structure below, and avoid damage to the outer protective structure.
[0022] The battery protection box 3 is fixedly connected to the electric vehicle body 1. The upper end of the battery protection box 3 is engaged with the protective box cover 5 and then fixed by bolts. The bolt connection ensures the stability of the connection between the two and facilitates subsequent disassembly and maintenance. A second sealing ring 16 is provided between the protective box cover 5 and the battery protection box 3. The lower end of the protective box cover 5 can be fixedly connected to the box cover connecting ring 17. The box cover connecting ring 17 and the side wall of the protective box cover 5 form an annular groove to precisely limit the second sealing ring 16 and prevent the second sealing ring 16 from shifting.
[0023] The bottom surface inside the battery protection box 3 is fixedly connected to the battery box support pad 7. The battery box support pad 7 is made of flexible buffer material, which can provide longitudinal flexible support for the battery box 8. The lower end of the protective box cover 5 is fixedly connected to the battery box pressure plate 6. The battery box pressure plate 6 and the battery box support pad 7 correspond vertically to each other, so as to achieve longitudinal positioning of the battery box 8 inside the battery protection box 3 and prevent the battery box 8 from moving longitudinally.
[0024] The battery protection box 3 is equipped with four sets of battery box limiting plates 10. Each set of battery box limiting plates 10 is connected to the inner wall of the battery protection box 3 through two dampers 11 and two return springs 12. The dampers 11 and the return springs 12 are arranged in parallel. In its natural state, the return springs 12 can push the battery box limiting plates 10 to fit tightly against the outer wall of the battery box 8, so as to achieve the lateral centering of the battery box 8. The dampers 11 can dissipate the impact energy during vibration.
[0025] The upper end of the battery box 8 is engaged with the cover 9. The upper edge of the battery box 8 protrudes outward to facilitate the initial positioning of the cover 9. Two sealing ring placement grooves 14 are provided at the upper end of the battery box 8. The first sealing ring 15 is engaged inside the sealing ring placement groove 14. The sealing ring placement groove 14 can fix the first sealing ring 15 and prevent the first sealing ring 15 from falling off. Eight sets of symmetrically distributed connecting blocks 13 are fixedly connected to the surface of the cover 9. The connecting blocks 13 are threaded with threaded rods 18 and slidably connected with limit blocks 19. The threaded rods 18 can push the limit blocks 19 to fit against the protruding edge of the battery box 8 to lock the cover 9 and the battery box 8.
[0026] Working principle: Battery pack pre-installation and cover locking. First, the battery pack is placed inside the battery box 8, and then the cover 9 is snapped onto the upper end of the battery box 8. Because the upper edge of the battery box 8 protrudes outward, the cover 9 can be initially aligned and positioned when it is snapped on. At this time, the eight sets of connecting blocks 13 fixed on the surface of the cover 9 correspond to the protruding edge of the battery box 8. Rotating the threaded rod 18 connected inside the connecting block 13 will push the slidingly connected limiting block 19 along the axial direction of the connecting block 13. Since the upper end of the limiting block 19 near the battery box 8 is inclined, the inclined structure will fit tightly against the protruding edge of the battery box 8 under the pushing force of the threaded rod 18. Through the synchronous locking of the eight sets of symmetrical structures, the cover 9 and the battery box 8 are firmly fixed, preventing relative displacement between the two during vehicle operation.
[0027] During the process of the inner waterproof seal forming the box cover 9 and the battery box 8 being fastened together, the first sealing ring 15, which is engaged in the two sealing ring placement grooves 14 at the upper end of the battery box 8, will be squeezed and deformed by the lower surface of the box cover 9 to form an annular sealing strip. This sealing strip can prevent moisture from entering from the joint between the box cover 9 and the battery box 8, forming the first waterproof barrier of the battery pack and ensuring that the inner space in direct contact with the battery pack is sealed.
[0028] The outer positioning and buffer support of the battery box allows the sealed and fixed battery box 8 to be placed inside the battery protection box 3. The battery box support pad 7 fixed to the bottom of the battery protection box 3 will contact the bottom of the battery box 8, and the flexible support will prevent the battery box 8 from making hard contact with the battery protection box 3. At the same time, four sets of battery box limiting plates 10 distributed on the inner wall of the battery protection box 3 (each set corresponds to two dampers 11 and two return springs 12) will fit against the battery box 8 from all sides. The battery box limiting plates 10 are connected to the inner wall of the battery protection box 3 through the dampers 11 and the return springs 12. Under natural conditions, the elastic force of the return springs 12 will push the battery box limiting plates 10 to press tightly against the outer wall of the battery box 8, so as to achieve the centered positioning of the battery box 8 in the battery protection box 3 and prevent lateral displacement.
[0029] The outer waterproof layer and the overall fixing cover 5 are placed on the protective box, so that the protective box cover 5 is snapped into the upper end of the battery protective box 3 and then fixed by bolts. At this time, the second sealing ring 16 set between the protective box cover 5 and the battery protective box 3 will be squeezed to form an annular sealing structure around the upper end of the battery protective box 3, which constitutes the second waterproof barrier of the battery pack and can prevent moisture from entering the outer space from the joint between the battery protective box 3 and the protective box cover 5. At the same time, the battery box pressure plate 6 fixed at the lower end of the protective box cover 5 will fit against the upper end of the battery box 8, and together with the battery box support pad 7, the vertical direction of the battery box 8 in the battery protective box 3 will be limited to prevent longitudinal movement.
[0030] When the electric vehicle encounters bumps or vibrations during operation, the battery box 8 will generate lateral or longitudinal impact forces. When the lateral impact force acts on the battery box 8, the battery box 8 will push the battery box limiting plates 10 around it. The battery box limiting plates 10 will compress the damper 11 and the return spring 12. The damper 11 consumes the impact energy through damping force, and the return spring 12 absorbs the impact through elastic deformation. The two work together to offset most of the lateral vibration, avoid the battery box 8 from colliding and being damaged with the inner wall of the battery protection box 3, and at the same time prevent the inner first sealing ring 15 from failing due to severe vibration.
[0031] During longitudinal vibration, the flexible support of the battery box support pad 7 and the limiting effect of the battery box pressure plate 6 work together to buffer the vertical movement of the battery box 8 and ensure the stability of the inner sealing structure.
[0032] The protective plate 4 fixed to the bottom of the battery pack compartment 2 can directly block stones and debris flying from the ground during vehicle operation from hitting the bottom of the battery protection box 3, preventing the battery protection box 3 from cracking due to external impact, indirectly protecting the integrity of the outer waterproof structure, and further improving the overall protection reliability.
[0033] Furthermore, the dual-layer waterproof design of "inner sealing and outer protection" effectively solves the defect in the background technology that "single-layer waterproof outer shell is prone to cracking and sealing failure, leading to water intrusion." In the inner layer, when the battery box 8 and the box cover 9 are fastened together, the sealing ring placement groove 14 limits the first sealing ring 15. After the first sealing ring 15 is squeezed, it forms a tight annular sealing band, directly blocking water from contacting the battery pack. In the outer layer, the battery protection box 3 and the protective box cover 5 cooperate, and the second sealing ring 16 forms a secondary seal. Even if the outer battery protection box 3 suffers minor damage due to long-term use, the inner first sealing ring 15 can still maintain the sealing state of the core area of the battery pack. The dual barrier greatly improves the waterproof reliability and ensures that the battery pack will not cause short circuits or cell degradation due to water intrusion in scenarios such as driving in the rain or car washing.
[0034] The cover connecting ring 17, fixed at the lower end of the protective cover 5, forms an annular groove with the side wall of the protective cover 5 to precisely limit the second sealing ring 16. At the same time, the sealing ring placement groove 14 on the battery box 8 fixes the first sealing ring 15. During assembly, the second sealing ring 16 will not shift due to uneven bolt tightening or vehicle vibration, and the first sealing ring 15 will not fall off due to the opening and closing of the cover 9. This ensures that the two sealing strips always maintain a complete and uniform sealing state, and can maintain a stable waterproof effect after long-term use, avoiding safety hazards caused by the displacement of the sealing components.
[0035] The four sets of battery box limiting plates 10 inside the battery protection box 3, together with the damper 11 and the return spring 12, can counteract the lateral vibration during vehicle operation. When the battery box 8 is subjected to lateral impact force due to bumps, the damper 11 consumes the impact energy, and the return spring 12 buffers the vibration through elastic deformation, preventing the battery box 8 from colliding hard with the battery protection box 3 and causing the outer shell to crack. At the same time, the battery box support pad 7 cooperates with the battery box pressure plate 6 at the lower end of the protective box cover 5 to buffer longitudinal vibration and prevent the first sealing ring 15 and the second sealing ring 16 from detaching due to severe vibration. This design not only protects the integrity of the inner and outer waterproof structures, but also reduces the performance degradation of the battery pack caused by vibration and extends the overall service life.
[0036] Example 1: Outer sealing reinforcement structure with box cover connecting ring A cover connecting ring 17 is fixedly connected to the lower end of the protective cover 5, forming a sealing ring limiting structure with the side wall of the protective cover 5. An annular cover connecting ring 17 is integrally formed and fixed on the lower end face of the protective cover 5. The outer diameter of the cover connecting ring 17 is adapted to the upper inner diameter of the battery protection box 3, and an annular groove with a width matching the thickness of the second sealing ring 16 is formed between the inner side wall of the protective cover 5 and the outer side wall of the cover connecting ring 17. Before assembly, the second sealing ring 16 is first embedded in the annular groove. Due to the limiting effect of the groove, the second sealing ring 16 will not shift or fall off. Then, the protective cover 5 is snapped onto the upper end of the battery protection box 3, so that the cover connecting ring 17 is inserted into the inside of the battery protection box 3. Finally, the protective cover 5 and the battery protection box 3 are fixed with bolts.
[0037] In rainy commuting scenarios, when electric vehicles are driving, water on the road surface is splashed up by the wheels and impacts the battery pack compartment 2 area. At this time, at the joint between the protective cover 5 and the battery protective box 3, because the second sealing ring 16 is limited by the annular groove, when the bolts are tightened, the second sealing ring 16 will be evenly squeezed and deformed along the groove to form a gapless annular sealing strip, completely blocking water from entering from the joint. Compared with the existing unlimited structure, this embodiment can avoid the problem of the second sealing ring 16 shifting due to vibration or uneven bolt tightening force, which leads to local sealing failure. It further strengthens the outer waterproof barrier and solves the defect in the background technology that "single-layer waterproof structure is prone to waterproof performance degradation due to seal displacement", ensuring that the battery pack operates stably for a long time in rainy environments.
[0038] Example 2: Arc-shaped folding guide battery box limiting structure The plate-shaped battery box limiting plate 10 is replaced with a structure with an outward folded arc at the top. All four sets of battery box limiting plates 10 are designed as a combination structure of "vertical body and upper arc-shaped folding part", with the folding direction facing the outside of the battery protection box 3. The vertical body of each set of arc-shaped battery box limiting plates 10 is connected to the inner wall of the battery protection box 3 through two dampers 11 and two return springs 12. In its natural state, the return springs 12 push the vertical body of the arc-shaped battery box limiting plate 10 toward the center of the battery protection box 3. During assembly, the pre-assembled battery box 8 is placed directly from above the battery protection box 3. The lower end of the battery box 8 first contacts the arc-shaped folding part of the arc-shaped battery box limiting plate 10. As it slides down the arc surface, the arc-shaped folding part will generate a guiding force on the battery box 8, pushing the battery box 8 to automatically adjust its position and center, and finally land smoothly on the battery box support pad 7.
[0039] In battery pack maintenance and replacement scenarios, maintenance personnel need to remove the old battery box 8 and install the new battery box 8. Due to the guiding effect of the arc-shaped battery box limiting plate 10, maintenance personnel do not need to repeatedly adjust the position of the battery box 8 to align with the four sets of plate-shaped limiting structures. They only need to put the battery box 8 in from above, and it can be automatically guided to the center position by the arc-shaped folding part, shortening the installation time and improving maintenance efficiency. At the same time, the surface of the arc-shaped folding part is smooth and will not scratch the outer wall of the battery box 8, avoiding the problem of the inner first sealing ring 15 failing to seal due to damage to the outer wall of the battery box 8, thus solving the defects of "cumbersome installation and easy damage to the sealing structure during battery pack maintenance" in the background technology. Moreover, the vertical body of the arc-shaped battery box limiting plate 10 can still work with the damper 11 and the return spring 12 to buffer lateral vibration and maintain the anti-vibration performance unchanged.
[0040] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. An electric vehicle having a protective device, characterized by: It includes an electric vehicle body (1) and a battery pack compartment (2). The electric vehicle body (1) is composed of wheels, a frame, a drive assembly, a steering assembly, and a brake assembly. The outer shell of the battery pack compartment (2) is fixedly connected to the frame of the electric vehicle body (1). The battery protection component is located inside the battery pack compartment (2) and includes a battery protection box (3). The battery protection box (3) is fixedly connected to the electric vehicle body (1). The upper end of the battery protection box (3) is fitted with a protective box cover (5). The protective box cover (5) and the battery protection box (3) are fixed together by bolts. A second sealing ring (16) is provided between the protective box cover (5) and the battery protection box (3). The battery box (8) is provided inside the battery protection box (3). The upper end of the battery box (8) is fitted with a box cover (9). The upper edge of the battery box (8) protrudes outward. Two sealing ring placement slots (14) are opened at the upper end of the battery box (8). The first sealing ring (15) is fitted inside the two sealing ring placement slots (14). A connecting block (13) is fixedly connected to the surface of the cover (9). A threaded rod (18) is threaded inside the connecting block (13). A limit block (19) is slidably connected inside the connecting block (13). The upper end of the limit block (19) on the side near the battery box (8) is inclined.
2. The electric vehicle with a protection device according to claim 1, characterized in that: The number of connecting blocks (13), threaded rods (18) and limiting blocks (19) are eight sets symmetrically arranged on the outside of the box cover (9).
3. An electric vehicle with a protective device according to claim 1, characterized in that: A protective plate (4) is fixedly connected to the bottom surface inside the battery pack compartment (2).
4. An electric vehicle with a protective device according to claim 1, characterized in that: The bottom surface inside the battery protection box (3) is fixedly connected to a battery box support pad (7), and the lower end of the protection box cover (5) is fixedly connected to a battery box pressure plate (6).
5. An electric vehicle with a protective device according to claim 1, characterized in that: The battery protection box (3) is equipped with a battery box limiting plate (10) inside. Two dampers (11) are fixedly connected to the inner wall of the battery protection box (3). A return spring (12) is sleeved on the surface of each of the two dampers (11). The two ends of the two dampers (11) and the two return springs (12) are respectively installed on the inner wall of the battery protection box (3) and the battery box limiting plate (10).
6. An electric vehicle with a protective device according to claim 5, characterized in that: The number of the battery box limiting plate (10), damper (11) and reset spring (12) are all four sets.
7. An electric vehicle with a protective device according to claim 1, characterized in that: The lower end of the protective box cover (5) is fixedly connected to a box cover connecting ring (17).
8. An electric vehicle with a protective device according to claim 5, characterized in that: The upper ends of the four battery box limiting plates (10) are curved outward.