阅读说明：本技术 一种具有风冷机构的电池热管理系统 (Battery thermal management system with air cooling mechanism ) 是由 曹磊 赵颖 林杰 方兴 于 2021-07-23 设计创作，主要内容包括：本发明公开了一种具有风冷机构的电池热管理系统,包括底壳,所述底壳的顶端卡接有顶盖,所述底壳的底端旋转连接有液冷机构,所述底壳的内壁底部卡接有换热机构,所述顶盖的顶端固定连接有风冷机构。本发明涉及新能源汽车领域。缓震底座和冷却板通过液冷机构完成散热降温处理,实现该装置对电池组的高效散热保护,下护板搭配风冷鳍片为水箱提供风冷散热保护,提高液冷机构的冷却效果,通过进风管和柔性可调导风管为该装置提供热辐射少的空气用于风冷散热,避免该装置直接获取来自路面的热空气,提高该装置的散热效率。这解决了现有的具有风冷机构的电池热管理系统冷却效率低、防爆保护不足和维护不便的问题。(The invention discloses a battery thermal management system with an air cooling mechanism, which comprises a bottom shell, wherein a top cover is clamped at the top end of the bottom shell, the bottom end of the bottom shell is rotatably connected with the liquid cooling mechanism, the bottom of the inner wall of the bottom shell is clamped with a heat exchange mechanism, and the top end of the top cover is fixedly connected with the air cooling mechanism. The invention relates to the field of new energy automobiles. The cushioning base and the cooling plate complete heat dissipation and cooling treatment through the liquid cooling mechanism, high-efficiency heat dissipation protection of the device on the battery pack is achieved, the lower protection plate is matched with the air cooling fins to provide air cooling heat dissipation protection for the water tank, the cooling effect of the liquid cooling mechanism is improved, air with less heat radiation is provided for the device through the air inlet pipe and the flexible adjustable air guide pipe and used for air cooling heat dissipation, the device is prevented from directly obtaining hot air from the road surface, and the heat dissipation efficiency of the device is improved. The battery thermal management system solves the problems of low cooling efficiency, insufficient explosion-proof protection and inconvenient maintenance of the existing battery thermal management system with the air cooling mechanism.)

1. The utility model provides a battery thermal management system with air-cooled mechanism, includes drain pan (1), its characterized in that: the heat dissipation device is characterized in that a heat dissipation terminal (2) is laterally arranged on the outer side of the bottom shell (1), a top cover (3) is connected to the top end of the bottom shell (1) in a clamped mode, an overhead heat dissipation terminal (4) is fixedly connected to the top end of the top cover (3), a liquid cooling mechanism (5) is connected to the bottom end of the bottom shell (1) in a rotating mode, a heat exchange mechanism (6) is connected to the bottom portion of the inner wall of the bottom shell (1) in a clamped mode, and an air cooling mechanism (7) is fixedly connected to the top end of the top cover (3).

2. The battery thermal management system with an air cooling mechanism according to claim 1, wherein: the bottom left side of drain pan (1) has seted up the liquid cooling hole, the bottom surface fixedly connected with strengthening rib of drain pan (1).

3. The battery thermal management system with an air cooling mechanism according to claim 1, wherein: the liquid cooling mechanism (5) comprises a lower protection plate (51), the right end of the lower protection plate (51) is rotatably connected to the right side of the bottom end of the bottom shell (1), the bottom surface of the lower protective plate (51) is fixedly connected with an air cooling fin (52), the left side of the top surface of the lower protective plate (51) is fixedly connected with a water tank (53), the right end of the water tank (53) is fixedly connected with a guide pipe (54), the top end of the guide pipe (54) penetrates through the outer side to the inner side of the bottom end of the bottom shell (1), the outer side of the conduit (54) is respectively fixedly connected with a water pump (55) and a radiator (56), the bottom end of the water pump (55) and the bottom end of the radiator (56) are fixedly connected with the top surface of the lower protective plate (51), the inner side of the left end of the lower guard plate (51) is connected with a fixed pin (57) through a thread, the left end of the fixing pin (57) is sleeved on the left side of the bottom end of the bottom shell (1).

4. The battery thermal management system with an air cooling mechanism according to claim 3, wherein: the left end of lower protective plate (51) has seted up the fixed orifices, the right-hand member fixedly connected with of lower protective plate (51) is rotatory round pin, and the outside swivelling joint of rotatory round pin is on the bottom right side of drain pan (1).

5. The battery thermal management system with an air cooling mechanism according to claim 1, wherein: heat transfer mechanism (6) are including bradyseism base (61), the outside joint of bradyseism base (61) is in the inner wall bottom of drain pan (1), the inboard fixed connection in the outside of pipe (54) in bottom of bradyseism base (61), the top of bradyseism base (61) is connected with cooling plate (62) and fixed plate (63) respectively in the joint, the top joint of cooling plate (62) is in the bottom of fixed plate (63), the top fixedly connected with group battery (64) of bradyseism base (61), the inboard fixedly connected with liquid cooling heat exchange tube (65) of cooling plate (62), the outside to the inboard at bradyseism base (61) is run through to the bottom of liquid cooling heat exchange tube (65), the outside to the inboard at pipe (54) is run through to the bottom of heat exchange tube (65).

6. The battery thermal management system with an air cooling mechanism according to claim 5, wherein: the bottom end of the cushioning base (61) is provided with a heat exchange cavity, and the top end of the cushioning base (61) is provided with a positioning hole.

7. The battery thermal management system with an air cooling mechanism according to claim 1, wherein: the air cooling mechanism (7) comprises a protective shell (71), the top of the inner wall of the protective shell (71) is fixedly connected to the top end of the top cover (3), the bottom end of the protective shell (71) abuts against the outer side of the bottom shell (1), the right end of the protective shell (71) is fixedly connected with an air outlet filter screen (72), the left end of the protective shell (71) is fixedly connected with a flexible adjustable air guide pipe (73), and the top end of the flexible adjustable air guide pipe (73) is fixedly connected with an air inlet pipe (74).

8. The battery thermal management system with an air cooling mechanism according to claim 7, wherein: the top end of the protective shell (71) is fixedly connected with a cushioning rubber mat, the top end of the cushioning rubber mat abuts against the bottom surface of the flexible adjustable air guide pipe (73), the top end of the protective shell (71) is in threaded connection with a fixing bolt, and the bottom end of the fixing bolt is in threaded connection with the inner side of the top end of the top cover (3).

Technical Field

The invention relates to the field of new energy automobiles, in particular to a battery thermal management system with an air cooling mechanism.

Background

Batteries used in a battery pack of a new energy vehicle are mainly divided into a lithium iron phosphate battery and a ternary lithium battery, wherein the lithium iron phosphate battery has the problems of poor low-temperature performance and low energy density, and the ternary lithium battery has the problems of poor safety, no high temperature resistance and toxic elements.

The prior patent (publication number: CN111883877A) discloses an electric vehicle battery thermal management device for collecting air cooling and liquid cooling, which comprises a box body and a plurality of rows of battery packs arranged in the box body, wherein each row of battery packs consists of a plurality of single batteries, each single battery is embedded in a composite phase change material body, the top and the bottom of each composite phase change material body are respectively attached to the corresponding liquid cooling plate, each liquid cooling plate is connected with a water pump, each water pump is connected with a water tank, a heat dissipation plate is arranged between every two adjacent rows of battery packs, one end of each heat dissipation plate is embedded in the corresponding composite phase change material body, the other end of each heat dissipation plate is exposed in the air in the box body, and a heat dissipation fan for exchanging heat with the corresponding heat dissipation plate is arranged on the box body. In the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved: 1. the device has the problem of low cooling efficiency in the design and use process, the heat dissipation plate and the heat dissipation fan provide air cooling heat dissipation for the device, the water tank, the water pump and the liquid cooling plate provide liquid cooling heat dissipation for the device, the structural redundancy is high, and the manufacturing cost is high; 2. the device lacks the explosion-proof protection of the battery pack in the use process, and when a vehicle collides, the device and the vehicle body absorb the capability generated by collision, so that the accidents that the battery pack fails to discharge normally and the battery pack knocks are easily caused; 3. the device has the inconvenient problem of maintenance in the use, and the structure is complicated, brings very big inconvenience to the later stage use maintenance of the device.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a battery thermal management system with an air cooling mechanism, which solves the problems of low cooling efficiency, insufficient explosion-proof protection and inconvenient maintenance of the conventional battery thermal management system with the air cooling mechanism.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a battery thermal management system with forced air cooling mechanism, includes the drain pan, the outside fixedly connected with side heat dissipation terminal of drain pan, the top joint of drain pan has the top cap, the top fixedly connected with overhead heat dissipation terminal of top cap, the bottom swivelling joint of drain pan has liquid cooling mechanism, the inner wall bottom joint of drain pan has heat transfer mechanism, the top fixedly connected with forced air cooling mechanism of top cap.

Preferably, the left side of the bottom end of the bottom shell is provided with a liquid cooling hole, and the bottom surface of the bottom shell is fixedly connected with a reinforcing rib.

Preferably, the liquid cooling mechanism includes the backplate down, the right-hand member swivelling joint of backplate is on the bottom right side of drain pan down, the forced air cooling fin of bottom surface fixedly connected with of backplate down, the top surface left side fixedly connected with water tank of backplate down, the right-hand member fixedly connected with pipe of water tank, the bottom outside to the inboard at the drain pan is run through on the top of pipe, fixedly connected with water pump and radiator are distinguished in the outside of pipe, the equal fixed connection in the top surface of backplate down in the bottom of water pump and radiator, the inboard threaded connection in left end of backplate has the fixed pin down, the left end of fixed pin is worn to overlap in the bottom left side of drain pan.

Preferably, the left end of the lower protection plate is provided with a fixing hole, the right end of the lower protection plate is fixedly connected with a rotating pin, and the outer side of the rotating pin is rotatably connected to the right side of the bottom end of the bottom shell.

Preferably, heat transfer mechanism includes the bradyseism base, the outside joint of bradyseism base is in the inner wall bottom of drain pan, the inboard fixed connection in the outside of pipe in bottom of bradyseism base, the top of bradyseism base is connected with cooling plate and fixed plate respectively in the joint, the top joint of cooling plate is in the bottom of fixed plate, the top fixedly connected with group battery of bradyseism base, the inboard fixedly connected with liquid cooling heat exchange tube of cooling plate, the outside to the inboard at the bradyseism base is run through to the bottom of liquid cooling heat exchange tube, the outside to the inboard at the pipe is run through to the bottom of liquid cooling heat exchange tube.

Preferably, the bottom end of the cushioning base is provided with a heat exchange cavity, and the top end of the cushioning base is provided with a positioning hole.

Preferably, the air cooling mechanism comprises a protective shell, the top of the inner wall of the protective shell is fixedly connected to the top end of the top cover, the bottom end of the protective shell abuts against the outer side of the bottom shell, the right end of the protective shell is fixedly connected with an air outlet filter screen, the left end of the protective shell is fixedly connected with a flexible adjustable air guide pipe, and the top end of the flexible adjustable air guide pipe is fixedly connected with an air inlet pipe.

Preferably, the top end of the protective shell is fixedly connected with a cushioning rubber mat, the top end of the cushioning rubber mat abuts against the bottom surface of the flexible adjustable air guide pipe, the top end of the protective shell is in threaded connection with a fixing bolt, and the bottom end of the fixing bolt is in threaded connection with the inner side of the top end of the top cover.

Advantageous effects

The invention provides a battery thermal management system with an air cooling mechanism. Compared with the prior art, the method has the following beneficial effects:

(1) the battery thermal management system with the air cooling mechanism improves the cooling efficiency of the battery pack and reduces the manufacturing cost of the device, the heat of the fixed plate is transferred to the fixed plate and the cooling plate, the cushioning base and the cooling plate complete heat dissipation and cooling treatment through the liquid cooling mechanism, the device realizes high-efficiency heat dissipation protection of the battery pack, the lower protective plate is matched with the air cooling fins to improve the structural strength of the lower protective plate, meanwhile, air cooling and heat dissipation protection are provided for the water tank, the cooling effect of the liquid cooling mechanism is improved, external high-speed airflow is guided into a gap between the protective shell and the top cover and the bottom shell through the air inlet pipe and the flexible adjustable air guide pipe to cool the side heat dissipation terminal and the top heat dissipation terminal, the air after heat exchange is discharged through the air outlet filter screen, air with less heat radiation is provided for the device through the air inlet pipe and the flexible adjustable air guide pipe to be used for air cooling and heat dissipation, and the device is prevented from directly obtaining hot air from the road surface, the heat dissipation efficiency of the device is improved.

(2) This battery thermal management system with forced air cooling mechanism accomplishes explosion protection of group battery, avoid the group battery to take place the detonation at the striking in-process, the device realizes one-level collision avoidance through backplate and protecting crust down, avoid external striking ability direct influence to group battery, improve the structural strength of drain pan and top shell through side-mounted heat dissipation terminal and top heat dissipation terminal, realize second grade collision avoidance through drain pan and top shell, avoid the group battery to take place the detonation because of the striking, through liquid cooling mechanism, heat transfer mechanism and forced air cooling mechanism realize the high-efficient heat dissipation protection of group battery, improve the service condition of group battery, improve the life of group battery, reduce the probability that the group battery takes place the detonation because of operational environment is abominable.

(3) This battery thermal management system with forced air cooling mechanism realizes convenient maintenance, reduce the device's later stage use cost, through integrating forced air cooling mechanism and liquid cooling mechanism, set up the top at the bottom of drain pan and top cap respectively, when maintaining liquid cooling mechanism, the connection of contact fixed pin and lower backplate, the lower backplate begins to use the bottom right side of drain pan to deflect as the centre of a circle, accomplish the expansion of liquid cooling mechanism, maintain convenient operation swift, when maintaining forced air cooling mechanism, can accomplish the whole maintenance of forced air cooling mechanism through demolising the protecting crust, remove the joint of top cap and drain pan, the convenience is maintained the maintenance to group battery and heat transfer mechanism.

Drawings

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a front cross-sectional view of the structure of the present invention;

FIG. 3 is an enlarged view of the structure of FIG. 2;

FIG. 4 is a left side view of the bottom housing structure of the present invention;

FIG. 5 is a left side view of the lower shield structure of the present invention;

FIG. 6 is a top view of the cushioning base structure of the present invention;

FIG. 7 is a left side view of the protective shell structure of the present invention;

FIG. 8 is a left side cross-sectional view of the cooling plate structure of the present invention.

In the figure: 1. a bottom case; 2. a side heat dissipation terminal; 3. a top cover; 4. a top-mounted heat dissipation terminal; 5. a liquid cooling mechanism; 51. a lower guard plate; 52. air-cooling the fins; 53. a water tank; 54. a water pump; 55. a heat sink; 56. a conduit; 57. a fixing pin; 6. a heat exchange mechanism; 61. a cushioning base; 62. a cooling plate; 63. a fixing plate; 64. a battery pack; 65. liquid cooling heat exchange tubes; 7. an air cooling mechanism; 71. a protective shell; 72. filtering with a screen; 73. a flexible adjustable air duct; 74. an air inlet pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, a battery thermal management system with an air cooling mechanism includes a bottom case 1, a side heat dissipation terminal 2 fixedly connected to an outer side of the bottom case 1, a top cover 3 fastened to a top end of the bottom case 1, a top heat dissipation terminal 4 fixedly connected to a top end of the top cover 3, a liquid cooling mechanism 5 rotatably connected to a bottom end of the bottom case 1, a heat exchange mechanism 6 fastened to a bottom portion of an inner wall of the bottom case 1, and an air cooling mechanism 7 fixedly connected to a top end of the top cover 3.

In the invention, a liquid cooling hole is formed in the left side of the bottom end of the bottom shell 1, and a reinforcing rib is fixedly connected to the bottom surface of the bottom shell 1. It should be noted that the structural strength of the bottom case 1 and the top case is improved by the side heat dissipation terminals 2 and the top heat dissipation terminals 4, and the crash protection of the battery pack 64 is realized by the bottom case 1 and the top case, so as to improve the safety of the battery pack 64.

In the invention, the liquid cooling mechanism 5 comprises a lower protection plate 51, the right end of the lower protection plate 51 is rotatably connected to the right side of the bottom end of the bottom shell 1, the bottom surface of the lower protection plate 51 is fixedly connected with air cooling fins 52, the left side of the top surface of the lower protection plate 51 is fixedly connected with a water tank 53, the right end of the water tank 53 is fixedly connected with a conduit 54, the top end of the conduit 54 penetrates through the outer side to the inner side of the bottom end of the bottom shell 1, the outer side of the conduit 54 is respectively and fixedly connected with a water pump 55 and a radiator 56, the bottom end of the water pump 55 and the bottom end of the radiator 56 are both fixedly connected to the top surface of the lower protection plate 51, the inner side of the left end of the lower protection plate 51 is in threaded connection with a fixing pin 57, and the left end of the fixing pin 57 penetrates through the left side of the bottom end of the bottom shell 1. It should be noted that the lower protection plate 51 and the water tank 53 provide the device with anti-collision protection, and in case of dragging the bottom of a vehicle, the lower protection plate 51 and the water tank 53 are used to prevent the ground from directly colliding with the bottom case 1 and the battery pack 64.

In the invention, the left end of the lower guard plate 51 is provided with a fixed hole, the right end of the lower guard plate 51 is fixedly connected with a rotating pin, and the outer side of the rotating pin is rotatably connected to the right side of the bottom end of the bottom shell 1. It should be noted that, the lower protection plate 51 and the water tank 53 are arranged at the bottom end of the bottom case 1, wherein the lower protection plate 51 is matched with the air cooling fins 52 to improve the structural strength of the lower protection plate 51, and meanwhile, the air cooling heat dissipation protection is provided for the water tank 53, so that the use gravity center of the device is reduced, and the driving experience of the new energy vehicle is improved.

In the invention, the heat exchange mechanism 6 comprises a cushioning base 61, the outer side of the cushioning base 61 is clamped at the bottom of the inner wall of the bottom shell 1, the inner side of the bottom end of the cushioning base 61 is fixedly connected at the outer side of the guide pipe 54, the top end of the cushioning base 61 is respectively clamped with a cooling plate 62 and a fixing plate 63, the top end of the cooling plate 62 is clamped at the bottom end of the fixing plate 63, the top end of the cushioning base 61 is fixedly connected with a battery pack 64, the inner side of the cooling plate 62 is fixedly connected with a liquid cooling heat exchange pipe 65, the bottom end of the liquid cooling heat exchange pipe 65 penetrates through the outer side to the inner side of the cushioning base 61, and the bottom end of the liquid cooling heat exchange pipe 65 penetrates through the outer side to the inner side of the guide pipe 54. It should be noted that the buffer base 61, the fixing plate 63 and the cooling plate 62 complete the partitioned fixing and isolation of the battery packs 64, so as to prevent the single battery pack 64 from generating a detonation wave and the adjacent battery packs 64.

In the invention, the bottom end of the cushioning base 61 is provided with a heat exchange cavity, and the top end of the cushioning base 61 is provided with a positioning hole. It should be noted that the heat of the fixing plate 63 is transferred to the fixing plate 63 and the cooling plate 62, and the shock absorption base 61 and the cooling plate 62 complete the heat dissipation and temperature reduction process through the liquid cooling mechanism 5.

In the invention, the air cooling mechanism 7 comprises a protective shell 71, the top of the inner wall of the protective shell 71 is fixedly connected to the top end of the top cover 3, the bottom end of the protective shell 71 is abutted against the outer side of the bottom shell 1, the right end of the protective shell 71 is fixedly connected with an air outlet filter screen 72, the left end of the protective shell 71 is fixedly connected with a flexible adjustable air guide pipe 73, and the top end of the flexible adjustable air guide pipe 73 is fixedly connected with an air inlet pipe 74. It should be noted that, the outside high-speed airflow is guided into the gap between the protective shell 71 and the top cover 3 and the bottom shell 1 through the air inlet pipe 74 and the flexible adjustable air guiding pipe 73 to cool the side heat dissipation terminal 2 and the top heat dissipation terminal 4, the air after heat exchange is discharged through the air outlet filter screen 72, and the air with less heat radiation is provided for the device through the air inlet pipe 74 and the flexible adjustable air guiding pipe 73 for air cooling and heat dissipation, so that the device is prevented from directly obtaining hot air from the road surface, and the heat dissipation efficiency of the device is improved.

In the invention, the top end of the protective shell 71 is fixedly connected with a cushioning rubber pad, the top end of the cushioning rubber pad is abutted against the bottom surface of the flexible adjustable air guide pipe 73, the top end of the protective shell 71 is in threaded connection with a fixing bolt, and the bottom end of the fixing bolt is in threaded connection with the inner side of the top end of the top cover 3. It should be noted that, when the air cooling mechanism 7 is maintained, the whole maintenance of the air cooling mechanism 7 can be completed by removing the protective shell 71, and the operation is convenient and fast.

When the device is used, the device is installed on a new energy automobile and used, the bending shape of the flexible adjustable air guide pipe 73 is adjusted according to the automobile body layout of the new energy automobile, high-speed air flow outside the automobile body is conveniently obtained by the flexible adjustable air guide pipe 73 through the air inlet pipe 74, the external high-speed air flow is guided into a gap between the protective shell 71 and the top cover 3 and the bottom shell 1 through the air inlet pipe 74 and the flexible adjustable air guide pipe 73 to cool the side heat dissipation terminal 2 and the top heat dissipation terminal 4, the air after heat exchange is discharged through the air outlet filter screen 72, the heat radiation of the air close to the bottom surface is high due to the reflection of sunlight on the ground, the air with less heat radiation is provided for the device through the air inlet pipe 74 and the flexible adjustable air guide pipe 73 and used for air cooling, the device is prevented from directly obtaining hot air from the road surface, and the heat dissipation efficiency of the device is improved.

Through water tank 53, water pump 55, heat exchanger and pipe 54 provide the liquid cooling protection for heat exchange mechanism 6, the heat transfer that group battery 64 during operation produced is to top cap 3, bottom shell 1, bradyseism base 61, on fixed plate 63 and the cooling plate 62, wherein top cap 3 and bottom shell 1 carry out the forced air cooling through side heat dissipation terminal 2 and overhead heat dissipation terminal 4, the heat transfer of fixed plate 63 is to fixed plate 63 and cooling plate 62 on, bradyseism base 61 and cooling plate 62 accomplish the heat dissipation cooling through liquid cooling mechanism 5 and handle, realize the device to the high-efficient heat dissipation protection of group battery 64.

The device realizes one-level collision avoidance through lower protective plate 51 and protecting crust 71, avoid external striking ability direct influence to group battery 64, improve the structural strength of drain pan 1 and top shell through side heat dissipation terminal 2 and overhead heat dissipation terminal 4, realize second grade collision avoidance through drain pan 1 and top shell, through the high-efficient collision avoidance of double-deck casing real battery group 64, avoid group battery 64 to take place the detonation because of the striking, through liquid cooling mechanism 5, heat transfer mechanism 6 and air-cooled mechanism 7 realize the high-efficient heat dissipation protection of group battery 64, improve the service condition of group battery 64, improve the life of group battery 64, reduce the probability that group battery 64 takes place the detonation because of operational environment is abominable.

When maintaining the device, through integrating air cooling mechanism 7 and liquid cooling mechanism 5, set up the bottom at drain pan 1 and the top of top cap 3 respectively, when maintaining liquid cooling mechanism 5, contact fixed pin 57 and the connection of lower backplate 51, lower backplate 51 begins to use the bottom right side of drain pan 1 to deflect as the centre of a circle, accomplish the expansion of liquid cooling mechanism 5, maintain convenient operation swiftly, when maintaining air cooling mechanism 7, can accomplish the whole maintenance of air cooling mechanism 7 through demolising protecting shell 71, remove the joint of top cap 3 and drain pan 1, conveniently maintain group battery 64 and heat exchange mechanism 6 and overhaul.

Through setting up backplate 51 and water tank 53 in the bottom of drain pan 1 down, wherein backplate 51 collocation forced air cooling fin 52 improves backplate 51's structural strength down, simultaneously for water tank 53 provides the air-cooled heat dissipation protection, reduce the device's use focus, improve new energy vehicle's driving experience, provide crashproof protection for the device through backplate 51 and water tank 53 down, drag the circumstances such as end at the encounter vehicle, backplate 51 and water tank 53's use avoids ground direct colliding with to drain pan 1 and group battery 64.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.