JP2015069804A - Power feeding device for motor-driven minishovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve exhaustion of hydrogen gas generated from a lead battery to the exterior and dissipation of heat caused by the hydrogen gas to the exterior, without providing a drain hose, and to prevent infiltration of rain water and the like.SOLUTION: A power feeding device for a motor-driven minishovel comprises: a battery chamber 2 housing a lead battery 1; and a power feeding chamber 3 housing a power feeding part supplying a stored power in the lead battery 1 to a lithium ion battery included in a motor-driven minishovel 21. At a part of an inner wall 12a of the battery chamber 2 located above the lead battery 1 housed in the battery chamber 2, an inclined part 4 gradually separated from the inner wall 12a as it goes higher while using a position of the part of the inner wall 12a as a base end, and located at an inner side of the battery chamber 2, and a pair of closing parts 5 covering gaps between both side ends of the inclined part 4 and the inner wall 12a, are provided. An opening 6 is formed by an upper end 4a of the inclined part 4, respective upper ends 5a of the pair of closing parts 5, and the inner wall 12a. A vent hole 7 is formed at a wall part opposed to the inclined part 4.

Description

  The present invention relates to a power supply device for an electric mini excavator including a lead battery that supplies power to a lithium ion battery included in the electric mini excavator.

  Recently, an electric mini excavator equipped with a lithium ion battery has been developed. In order to supply power to an electric mini excavator that performs excavation work or the like at each work place, development of a power supply device including a relatively inexpensive lead battery is desired. Such a power supply device includes a battery chamber in which a lead battery is accommodated, and a power supply chamber in which a power supply unit that supplies a relatively expensive lithium ion battery provided in an electric mini-excavator with the power stored in the lead battery is accommodated. Possible configurations are possible.

  When the lead battery is accommodated in the battery chamber of the power supply apparatus as described above, the discharge of the hydrogen gas generated from the lead battery and the discharge of the heat generated by the hydrogen gas to the outside are performed. It becomes a problem.

  Patent Document 1 discloses an electric excavator provided with a lead battery. This prior art has a drain hose that is connected to the discharge port of the lead battery and pulled out so that the other end hangs down outside the vehicle body, and discharges hydrogen gas generated from the lead battery to the lower outside of the vehicle body. It is shown. Therefore, it can be considered that the drain hose shown in Patent Document 1 is utilized in a power feeding device that feeds power to an electric mini-excavator.

JP 2012-202066 A

  However, there are the following problems in utilizing the drain hose disclosed in Patent Document 1 in a power feeding device of an electric mini-excavator.

1. The drain hose disclosed in Patent Document 1 is intended to discharge hydrogen gas generated from a lead battery that is suspended outside the vehicle body to the outside of the vehicle body, and is applied to a power supply device of an electric mini excavator. Discharges hydrogen gas downward around the power feeding device. However, since hydrogen gas is lighter than air, depending on the drain hose that hangs down around the power supply device and the discharge port faces downward, basically, the hydrogen gas generated in the lead battery contained in the battery chamber of the power supply device It is difficult to expect improvement in emission efficiency.

2. In order to improve the discharge efficiency, it is conceivable to arrange the drain port of the above-described drain hose upward, but if the discharge port is directed upward in this way, rainwater or the like may enter from the discharge port. Therefore, there is a concern that the lead battery housed in the battery chamber of the power feeding device is deteriorated by rainwater or the like that has entered.

3. The hydrogen gas generated from the lead battery is discharged from the drain hose discharge port, but the drain hose discharge port must be a discharge port having a relatively small diameter. Therefore, the amount of hydrogen gas discharged is limited, and it is difficult to expect an improvement in the hydrogen gas discharging efficiency in this respect.

4). The above-described exhaust heat generated with the hydrogen gas becomes a problem, but when a drain hose is provided in the power supply device, the heat is exhausted downward around the power supply device via the drain hose. Therefore, an adverse effect of heating the vicinity of the place where the power feeding device is installed can be considered.

  The present invention has been made based on the above-described situation in the prior art. The purpose of the present invention is to discharge hydrogen gas generated from a lead battery to the outside without providing a drain hose, and to discharge heat accompanying the hydrogen gas to the outside. It is an object of the present invention to provide a power supply device for an electric mini excavator that can realize heat and prevent intrusion of rainwater or the like.

  In order to achieve this object, the present invention provides a battery chamber in which a lead battery is accommodated, and a power supply chamber in which a power feeding unit that supplies the stored power of the lead battery to a lithium ion battery provided in an electric mini-excavator is accommodated. A power supply device for an electric mini-excavator comprising: a portion of the inner wall of the battery chamber located above the lead battery housed in the battery chamber; An inclined portion that is gradually separated from the inner wall as it goes and is located on the inner side of the battery chamber, and a pair of closing portions that close the gap between the both side ends of the inclined portion and the inner wall, and an upper end of the inclined portion, An opening is formed by the respective upper ends of the pair of closed portions and the inner wall, and a vent is formed in a wall portion facing the inclined portion.

  In the present invention configured as described above, the hydrogen gas generated from the lead battery housed in the battery chamber and the heat accompanying the hydrogen gas rise in the battery chamber, and are further accompanied by the hydrogen gas and the hydrogen gas. Heat is transferred from the opening formed by the upper end of the inclined portion, the upper ends of each of the pair of closed portions, and the inner wall of the battery chamber to the outside through a vent formed in the wall portion facing the inclined portion. Discharged.

  That is, this invention can implement | achieve the discharge | emission of the hydrogen gas which generate | occur | produced from the lead battery by the opening part and the vent hole to the exterior, and the heat | fever exhaustion of the heat accompanying hydrogen gas without providing a drain hose.

  In addition, since the present invention is provided with an inclined portion at a position facing the vent, even if rainwater or the like enters from the vent, the rainwater or the like is blocked by the inclined portion and is lowered downward along the inclined portion. It can be drained and discharged from the vent.

  Further, according to the present invention, since the opening amount of the opening and the opening amount of the vent hole can be set sufficiently larger than the diameter size of the drain hose, a large discharge amount of hydrogen gas and an exhaust heat amount can be ensured. Can do.

  In addition, according to the present invention, heat can be exhausted to the outside at the upper portion of the power supply device through the vent.

  Further, the present invention is the above invention, wherein the battery chamber includes a front partition plate provided continuously to the power supply chamber, a rear partition plate provided to face the front partition plate, and a side end of the front partition plate. And a pair of side partition plates connected to the side end of the rear partition plate facing the side ends, and each of the front partition plate, the rear partition plate, and the pair of side partition plates. An upper plate that is connected to the upper end and covers the internal space, and a bottom support portion that is connected to the lower ends of the front partition plate, the rear partition plate, and the pair of side partition plates and supports the lead battery. Each of the pair of side surface partition plates is provided with the vent and a combination of the inclined portion, the pair of closed portions, and the opening portion. It is characterized by.

  The present invention configured as described above can discharge hydrogen gas and heat associated with hydrogen gas from the respective vent holes of the pair of side surface partition plates, that is, from a plurality of vent holes. And contribute to securing a large amount of exhaust heat.

  Moreover, the present invention is characterized in that, in the above invention, the lower end of the inclined portion and the lower end of the vent are set at the same height position.

  According to the present invention configured as described above, rainwater or the like entering from the vent and blocked by the inclined portion can be smoothly guided from the lower end of the inclined portion to the vent and discharged to the outside.

  Moreover, the present invention is characterized in that, in the above invention, the height of the opening is provided at a position higher than the upper end of the vent.

  The present invention configured as described above can receive rainwater or the like that has entered from the vent at a portion lower than the upper end of the inclined portion, and can discharge the rainwater or the like from the vent to the outside. Can be prevented.

  Further, the present invention is characterized in that in the above invention, a suspension part that is utilized when the truck is lifted to the loading platform is provided in the upper part of the battery chamber.

  According to the present invention configured as described above, the power feeding device can be lifted on the truck bed relatively easily through the suspension provided in the upper portion of the battery chamber. In addition, the power supply device can be lowered from the loading platform such as a truck relatively easily via the suspension portion.

  The present invention can achieve the discharge of hydrogen gas generated from a lead battery to the outside without providing a drain hose, and the discharge of heat accompanying the hydrogen gas to the outside. Thermal efficiency can be improved as compared with the prior art.

  In addition, the present invention allows rainwater or the like that has entered from the vent to flow downward along the inclined portion and can be discharged to the outside from the vent, thereby preventing deterioration of the lead battery contained in the battery chamber due to rainwater or the like. it can.

  In addition, the present invention can secure a large discharge amount of hydrogen gas and a large amount of exhaust heat as compared with the conventional case, and also in this respect, the discharge efficiency and exhaust heat efficiency of hydrogen gas can be improved as compared with the conventional case.

  Further, according to the present invention, heat can be exhausted to the outside at the upper portion of the power supply device through the vent, and heating due to exhaust heat near the installation location of the power supply device can be suppressed.

1 is a perspective view showing an embodiment of a power supply device for an electric mini-excavator according to the present invention. It is a perspective view which shows the state which removed the rear side partition plate which comprises the battery chamber with which this embodiment is equipped. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a principal part side view of FIG. It is a figure which shows the truck which conveys the electric power feeder which concerns on this embodiment to the installation position of an electrically driven mini excavator, (a) A figure is a side view, (b) A figure is a rear view. It is a figure which shows the state which electrically feeds to an electric mini excavator with the electric power feeder which concerns on this embodiment. It is a figure which shows the operation | movement of this embodiment, and is a figure which shows the state which removed the rear side partition plate. It is a principal part expansion perspective view of FIG. It is a principal part enlarged side view of FIG.

  Embodiments of a power supply device for an electric mini-excavator according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of a power supply device for an electric mini-excavator according to the present invention. FIG. 2 is a perspective view showing a state in which a rear partition plate constituting a battery chamber provided in the embodiment is removed. 3 is an enlarged view of the main part of FIG. 2, and FIG. 4 is a side view of the main part of FIG.

  As shown in FIGS. 1 and 2, the power supply device according to the present embodiment is a battery chamber 2 in which a plurality of lead batteries 1 are housed, and a lithium ion battery provided in an electric mini-excavator that stores electric power in the lead batteries 1. And a power supply chamber 3 in which a power supply unit to be supplied is accommodated.

  As shown in FIGS. 3 and 4, in the present embodiment, the inner wall portion of the battery chamber 2 positioned above the lead battery 1 accommodated in the battery chamber 2 is positioned upward with the inner wall portion as a base end. An inclined portion 4 that is gradually separated from the inner wall as it goes and is located on the inner side of the battery chamber 2, and a pair of closing portions 5 that close the gap between the both side ends of the inclined portion 4 and the inner wall are provided.

  As shown in FIG. 4, an opening 6 is formed by the upper end 4 a of the inclined portion 4 described above, the upper ends 5 a of the pair of closing portions 5, and the inner wall of the battery chamber 2. A vent hole 7 is formed in the wall portion of the battery chamber 2 facing the inclined portion 4.

  As shown in FIGS. 1 and 2, the battery chamber 2 described above includes a front partition plate 10 connected to the power supply chamber 3, a rear partition plate 11 provided to face the front partition plate 10, and a front partition. A pair of side surface partition plates 12 connected to the side end of the plate 10 and the side end of the rear partition plate 11 facing the side end are provided.

  As shown in FIG. 1, the battery chamber 2 includes an upper plate 13 connected to the upper ends of the front partition plate 10, the rear partition plate 11, and the pair of side partition plates 12 to cover the internal space, and the front side The partition plate 10, the rear partition plate 11, and the pair of side surface partition plates 12 are connected to the lower ends of the partition plate 10, and are formed of a sealed box body having a bottom support portion 14 that supports the lead battery 1.

  In this embodiment, each of the pair of side surface partition plates 12 is provided with the vent hole 7 and a combination of the inclined portion 4, the pair of closing portions 5, and the opening portion 6.

  As shown in FIGS. 3 and 4, in this embodiment, the lower end 4 b of the inclined portion 4 and the lower end 7 a of the vent hole 7 are set at the same height position.

  As shown in FIG. 4, in the present embodiment, the height of the opening 6 is provided at a position higher than the upper end 7 b of the vent 7.

  As shown in FIGS. 1 and 2, in the present embodiment, a plurality of suspension portions 8 that are utilized when the truck is lifted to the loading platform are provided in the upper portion of the battery chamber 2.

  FIG. 5 is a diagram showing a truck that transports the power feeding device according to the present embodiment to the installation position of the electric mini-excavator. FIG. 5A is a side view, FIG. 5B is a rear view, and FIG. It is a figure which shows the state which supplies electric power to an electric mini excavator by the electric power feeder which concerns.

  For example, when power is supplied to the lithium ion battery provided in the electric mini excavator 21 performing excavation work or the like at the work site, this embodiment is utilized by utilizing the suspension portion 8 provided in the battery chamber 2 as shown in FIG. As shown in FIG. 2, for example, the truck 20 is lifted on the loading platform 20a of the 2-ton truck 20, and the truck 20 equipped with the power feeding device according to the present embodiment is driven to the place where the electric mini excavator 21 is installed. Utilizing the power supply device according to the present embodiment from the loading platform 20a of the truck 20 is performed. And as shown in FIG. 6, the electric power feeding part accommodated in the electric power feeding chamber 3 with which this embodiment is equipped, and the electric mini excavator 21 are connected by the cable 50, The electric mini excavator 21 is connected via this cable 50. Power is supplied to the lithium ion battery included in the battery.

  As shown in FIG. 6, the electric mini excavator 21 fed by the power feeding device according to the present embodiment includes, for example, a traveling body 22, a revolving body 23 disposed on the traveling body 22, and the revolving body And a work device 24 attached to the body 23 so as to be rotatable in the vertical direction. The work device 24 includes a boom 25, an arm 26, and a bucket 27. A canopy 28 is disposed on the revolving structure 23, and a counterweight 29 is disposed at a rear position to ensure a weight balance. A machine room 30 is provided between the canopy 28 and the counterweight 29, and a lithium ion battery as a storage battery is accommodated in the machine room 30.

  7 is a view showing the operation of the present embodiment, and is a view showing a state in which the rear partition plate is removed, FIG. 8 is an enlarged perspective view of the main part of FIG. 7, and FIG. 9 is an enlarged side view of the main part of FIG. .

  In the present embodiment, the hydrogen gas generated from the lead battery 1 accommodated in the battery chamber 2 and the heat accompanying the hydrogen gas rise in the battery chamber 2 as indicated by arrows 40 and 41 in FIG. To do. Further, as shown in FIGS. 8 and 9, the hydrogen gas and the heat accompanying the hydrogen gas are generated by the upper end 4 a of the inclined portion 4, the upper ends 5 a of the pair of closed portions 5, and the inner wall of the battery chamber 2, that is, As shown by arrows 42 and 43, the openings 6 formed by the respective inner walls 12 a of the side partition plates 12 pass through the ventilation holes 7 formed in the portions of the inner walls 12 a facing the inclined portions 4. Discharged.

  As described above, the power supply apparatus according to the present embodiment discharges the hydrogen gas generated from the lead battery 1 by the opening 6 and the vent 7 to the outside without providing the drain hose, and outputs the heat accompanying the hydrogen gas to the outside. The exhaust heat can be realized. Thereby, this embodiment can improve the discharge efficiency and exhaust heat efficiency of hydrogen gas.

  Further, in the present embodiment, since the vent 7 is provided at a position facing the inclined portion 4, even when rainwater or the like enters from the vent 7, the rainwater or the like is blocked by the inclined portion 4, and this inclined portion 7 is allowed to flow downward and can be discharged from the vent 7 to the outside. Thereby, this embodiment can prevent deterioration of the lead battery 1 accommodated in the battery chamber 2 by rainwater etc.

  Moreover, since the opening amount of the opening part 6 and the opening amount of the vent hole 7 can be set sufficiently larger than the diameter dimension of the drain hose in this embodiment, the large discharge amount and exhaust heat amount of hydrogen gas can be set. Can be secured. In this respect as well, the present embodiment can improve the hydrogen gas exhaust efficiency and the exhaust heat efficiency.

  Further, in the present embodiment, heat can be exhausted to the outside through the vent 7 at the upper portion of the power supply apparatus. Thereby, this embodiment can suppress the heating by the exhaust heat near the installation location of the said electric power feeder.

  Further, in the present embodiment, hydrogen gas and heat accompanying the hydrogen gas can be discharged from the respective vent holes 7 of the pair of side surface partition plates 12 of the battery chamber 2, that is, from the plural vent holes 7. This contributes to securing a large amount of emissions and a large amount of exhaust heat.

  Further, in the present embodiment, since the lower end 4b of the inclined portion 4 and the lower end 7a of the vent 7 are set at the same height position, rainwater or the like that enters the vent 7 and is blocked by the inclined portion 4 is inclined. 4 can be smoothly guided from the lower end 4b to the vent 7 and discharged to the outside.

  Further, in the present embodiment, since the height of the opening 6 is provided at a position higher than the upper end 7 b of the vent 7, the rainwater or the like that has entered from the vent 7 is lower than the upper end 4 a of the inclined portion 4. Can be discharged from the vent 7 to the outside. As a result, it is possible to reliably prevent rainwater or the like from entering the battery chamber 2.

  Further, in the present embodiment, since the suspension portion 8 that is utilized when the truck 20 is lifted to the loading platform 20a is provided in the upper portion of the battery chamber 2, the power feeding device can be relatively easily tracked through the suspension portion 8. It can be lifted on 20 loading platforms 20a. Further, the power feeding device can be lowered from the loading platform 20a such as the truck 20 through the suspension portion 8 with relative ease.

DESCRIPTION OF SYMBOLS 1 Lead battery 2 Battery chamber 3 Feeding chamber 4 Inclined part 4a Upper end 4b Lower end 5 Closed part 5a Upper end 6 Opening part 7 Vent 7a Lower end 7b Upper end 8 Suspension part 10 Front partition plate 11 Rear partition plate 12 Side partition plate 12a Inner wall 13 Upper plate 14 Bottom support portion 20 Truck 20a Loading platform 21 Electric mini excavator

Claims (5)

In a power supply device for an electric mini excavator, comprising: a battery chamber in which a lead battery is accommodated; and a power supply chamber in which a power supply unit that supplies power stored in the lead battery to a lithium ion battery provided in the electric mini excavator is accommodated. ,
The portion of the inner wall of the battery chamber located above the lead battery accommodated in the battery chamber is gradually separated from the inner wall as it goes upward with the position of the portion of the inner wall as a base end. An inclined portion located on the inner side, and a pair of blocking portions that block the gap between the both side ends of the inclined portion and the inner wall,
An upper end of the inclined portion, an upper end of each of the pair of blocking portions, and the inner wall form an opening,
A power supply device for an electric mini-excavator, wherein a vent is formed in a wall portion facing the inclined portion. In the electric mini-excavator power feeding device according to claim 1,
The battery compartment is
A front partition plate connected to the power supply chamber;
A rear partition plate provided facing the front partition plate;
A pair of side surface partition plates connected to a side end of the front side partition plate and a side end of the rear side partition plate facing the side end;
An upper plate that is connected to the respective upper ends of the front partition plate, the rear partition plate, and the pair of side partition plates and covers the internal space;
The front partition plate, the rear partition plate, and a pair of side surface partition plates are connected to the lower ends of each of the pair of side surface partition plates, and comprise a sealed box having a bottom support portion for supporting the lead battery,
A power supply device for an electric mini-excavator, characterized in that each of the pair of side surface partition plates is provided with the vent and a combination of the inclined portion, the pair of closed portions, and the opening. . In the electric mini-excavator power feeding device according to claim 2,
A power supply device for an electric mini excavator, wherein the lower end of the inclined portion and the lower end of the vent are set at the same height position. In the electric power feeder of the electric mini-excavator according to any one of claims 1 to 3,
A power supply apparatus for an electric mini-excavator, wherein the height of the opening is provided at a position higher than the upper end of the vent. In the electric power feeder of the electric mini-excavator according to any one of claims 1 to 4,
A power supply device for an electric mini-excavator, characterized in that a suspension portion that is utilized when lifting the truck from the loading platform is provided in the upper portion of the battery chamber.

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