Power-operated work vehicle

Abstract

To provide an electric work vehicle which inhibits increase of material costs and increase of the weight of a battery and can prevent entry of water into the battery from a gap occurring between a battery cover and a connection part.SOLUTION: An electric work vehicle includes: a battery which is mounted on a machine body; a motor which is driven by electric power supplied from the battery; a travel device which is driven by the motor; and multiple connection parts 43 with which electric wiring H for inputting and outputting electric power of the battery is detachably connected. The battery has: a power storage part 4A which stores electric power; and a battery cover 4B which houses the power storage part 4A. The battery cover 4B has a thick part 41 where a thickness is larger than that of other portions of the battery cover 4B. The connection parts 43 are provided at the thick part 41.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an electric work vehicle equipped with a battery mounted on a vehicle body, a motor driven by power supplied from the battery, and a traveling device driven by the motor. [Background technology]

[0002] An example of an electric work vehicle as described above is already known, for example, from Patent Document 1. This conventional electric work vehicle (referred to as a "tractor" in Patent Document 1) is capable of traveling by driving a traveling device with power supplied from a battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-000953 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional electric work vehicles, power is supplied from a battery to a motor provided on the traveling gear, and electrical wiring for supplying power from the battery to the motor is connected to the battery, and electrical wiring for supplying power from the charger to the battery is connected to the battery, and these electrical wirings are thought to be configured to be connected to connection parts supported on the outer wall of the battery.

[0005] With this configuration, the battery requires at least a connection portion to which electrical wiring for supplying power from the battery to the motor is connected, and a connection portion to which electrical wiring for supplying power from the charger to the battery is connected.

[0006] If the thickness of the battery cover constituting the outer wall of the battery is made small, the battery cover is easily deformed. If the battery cover is deformed, a gap is generated between the battery cover and the connection part, and there is a risk of water entering the inside of the battery through the gap. In order to prevent water from entering the inside of the battery, it is necessary to increase the thickness of the battery cover constituting the outer wall of the battery and to firmly fix the connection part to the battery cover. However, such a configuration increases the material cost and causes the battery to become heavy.

[0007] The object of the present invention is to provide an electric work vehicle that can prevent water from entering the battery through a gap between the battery cover and the connection part, while suppressing increases in material costs and battery weight. [Means for solving the problem]

[0008] The electric work vehicle of the present invention is equipped with a battery mounted on a vehicle body, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected, the battery has a power storage unit that stores power, and a battery cover that houses the power storage unit, the battery cover has a thick part that is thicker than other parts of the battery cover, and the connection parts are provided on the thick part. A plurality of the connection portions are provided in one of the thick portions. .

[0009] According to this invention, the battery cover is configured so that the portions other than the thick portion are thinner than the thick portion. This configuration makes it possible to reduce material costs and the weight of the battery. Furthermore, by providing the connection portion at the thick portion, the connection portion is provided at a stronger portion of the battery cover. This configuration makes it difficult for the cover to deform, and also makes it possible to firmly support the connection portion on the battery cover using fasteners such as bolts. As a result, it becomes possible to prevent water from entering the battery cover through gaps.

[0010] The present invention Electric work vehicle teeth, a battery mounted on a vehicle body, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected, the battery has a power storage unit that stores power, and a battery cover that houses the power storage unit, the battery cover has a thick part that is thicker than other parts of the battery cover, and the connection parts are provided in the thick part, The thick portion is The plate-shaped member is provided on a wall portion extending in the vertical direction and is thicker than the wall portion. .

[0011] Since the thick portion in which the connection part is provided is made of a separate material from the battery cover, when performing maintenance work on the connection part and its surroundings, the work can be made easier by removing the thick portion from the battery cover.

[0012] The present invention Electric work vehicle teeth, a battery mounted on a vehicle body, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected, the battery has a power storage unit that stores power, and a battery cover that houses the power storage unit, the battery cover has a thick part that is thicker than other parts of the battery cover, and the connection parts are provided in the thick part, The thick portion is provided on a front wall portion of the battery cover, and the plurality of connection portions are provided on a front surface of the thick portion. do.

[0013] this invention According to the present invention, the connection portion is provided on the front wall of the battery cover. The front wall of the battery cover is easily exposed to wind during driving. This wind blows away dust and other particles from the connection portion provided on the front part of the thick portion and its surroundings, making it difficult for dust and other particles to accumulate. As a result, it is possible to prevent failure of the connection portion due to accumulation of dust and the like at the connection portion and its surroundings.

[0014] In the present invention, it is preferable that at least one of the plurality of connection portions is a connection portion for connecting an electric wire for charging the power storage portion with power supplied from an external power supply.

[0015] According to this configuration, it is possible to suppress deformation of the battery cover at the connection portion to which electrical wiring for charging the storage unit is connected, and it is possible to make it less likely for a gap to occur between the battery cover and the connection portion.

[0016] In the present invention, it is preferable that an inverter is provided which converts DC power from the storage unit into AC power and supplies the AC power to the motor, and at least one of the multiple connection parts is a connection part which connects electrical wiring for outputting power from the storage unit to the inverter.

[0017] With this configuration, it is possible to suppress deformation of the battery cover at the connection portion that connects electrical wiring for outputting power from the storage unit to the inverter, and to make it less likely for gaps to form between the battery cover and the connection portion.

[0018] In the present invention, it is preferable that a DC-DC converter is provided which adjusts the magnitude of the DC voltage of the storage unit and outputs it, and at least one of the multiple connection parts is a connection part which connects electrical wiring for outputting power from the storage unit to the DC-DC converter.

[0019] With this configuration, it is possible to suppress deformation of the battery cover at the connection portion that connects the electrical wiring for outputting power from the storage unit to the DC-DC converter, and to make it less likely for a gap to form between the battery cover and the connection portion.

[0020] The present invention Electric work vehicle teeth, a battery mounted on a vehicle body, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected, the battery has a power storage unit that stores power, and a battery cover that houses the power storage unit, the battery cover has a thick part that is thicker than other parts of the battery cover, and the connection parts are provided in the thick part, The battery is provided with a cooling fan for cooling the power storage unit, and at least one of the plurality of connection parts is a connection part for connecting an electric wiring for inputting power for driving the cooling fan. do.

[0021] this inventionThis makes it possible to suppress deformation of the battery cover at the connection portion where electrical wiring is connected to input power to drive the cooling fan, and makes it less likely for gaps to form between the battery cover and the connection portion.

[0022] The present invention Electric work vehicle teeth, a battery mounted on a vehicle body, a motor driven by power supplied from the battery, a traveling device driven by the motor, and a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected, the battery has a power storage unit that stores power, and a battery cover that houses the power storage unit, the battery cover has a thick part that is thicker than other parts of the battery cover, and the connection parts are provided in the thick part, A pressure adjusting portion is provided in the thick portion to adjust the air pressure inside the battery cover. do.

[0023] this invention According to the present invention, the pressure adjusting portion is provided in the thick portion. For example, when the air pressure inside the battery cover increases, the pressure adjusting portion receives the pressure from the inside of the battery cover. Even if the air pressure inside the battery cover increases and the pressure adjusting portion receives the pressure from the inside of the battery cover, the pressure adjusting portion is firmly supported by the thick portion.

[0024] In the present invention, it is preferable that the pressure adjusting portion is provided on a surface of the thick portion along the up-down direction.

[0025] According to this configuration, since the pressure adjusting portion is provided on a surface along the vertical direction, even if water adheres to the pressure adjusting portion, it is easy for the water to flow off. As a result, it is possible to prevent a deterioration in the pressure adjusting function due to water adhering to the pressure adjusting portion.

[0026] In the present invention, it is preferable that the thick portion has a recessed portion recessed from the outer surface of the thick portion toward the inside of the battery cover, and that the pressure adjustment portion is provided in the recessed portion with a gap between the outer surface of the thick portion and the pressure adjustment portion.

[0027] According to this configuration, a gap is provided between the outer surface of the thick portion and the pressure adjusting portion, so that water that adheres to the battery cover and flows toward the pressure adjusting portion falls into this gap. As a result, adhesion of water to the pressure adjustment portion can be reduced, and a decrease in the pressure adjustment function caused by adhesion of water to the pressure adjustment portion can be prevented.

[0028] In the present invention, it is preferable that the pressure adjustment portion be provided at a position aligned horizontally with an electrical wiring connected to any one of the plurality of connection portions.

[0029] With this configuration, even if water or the like splashes horizontally, it is prevented by the electrical wiring, so adhesion of water or the like to the pressure adjustment section can be reduced. As a result, it is possible to prevent a decrease in the pressure adjustment function due to water adhering to the pressure adjustment section. [Brief description of the drawings]

[0030] [Figure 1] FIG. [Diagram 2] FIG. 4 is a left side view showing the arrangement of an inverter and the like. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 4 is a cross-sectional view showing a configuration of a connection portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of the arrow F in the drawing is "forward", the direction of the arrow B is "backward", the direction of the arrow L is "left", and the direction of the arrow R is "right". Also, the direction of the arrow U in the drawing is "upward", and the direction of the arrow D is "downward".

[0032] [Overall configuration of the tractor] The tractor of this embodiment will be described below. As shown in Fig. 1, the tractor has left and right front wheels 10, left and right rear wheels 11, and a cover member 12.

[0033] The tractor also includes a machine body frame 2 and a driving section 3. The machine body frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11.

[0034] The cover member 12 is disposed at the front of the vehicle body. The driver's section 3 is provided behind the cover member 12. In other words, the cover member 12 is disposed in front of the driver's section 3.

[0035] The driving section 3 has a protective frame 30, a driving seat 31, and a steering wheel 32. An operator can sit in the driving seat 31. This allows the operator to get into the driving section 3. The left and right front wheels 10 are steered by operating the steering wheel 32. The operator can perform various driving operations in the driving section 3.

[0036] The tractor is equipped with a driving battery 4 (corresponding to the "battery" according to the present invention). The cover member 12 is configured to be swingable about an opening / closing axis Q along the left-right direction of the vehicle body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in a closed state, the driving battery 4 is covered by the cover member 12.

[0037] As shown in Fig. 2, the tractor includes an inverter 14 and a motor M. The driving battery 4 supplies power to the inverter 14. The inverter 14 converts DC power from the driving battery 4 into AC power and supplies it to the motor M. The motor M is then driven by the AC power supplied from the inverter 14.

[0038] 2 and 3, the tractor is equipped with a hydrostatic continuously variable transmission 15 and a transmission 16. As shown in Fig. 3, the hydrostatic continuously variable transmission 15 has a hydraulic pump 15a and a hydraulic motor 15b.

[0039] The hydraulic pump 15a is driven by rotational power from the motor M. When the hydraulic pump 15a is driven, the rotational power is output from the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is configured so that the speed of the rotational power is changed between the hydraulic pump 15a and the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is also configured so that the gear ratio can be changed steplessly.

[0040] The rotational power output from the hydraulic motor 15 b is transmitted to the transmission 16 . The rotational power transmitted to the transmission 16 is changed in speed by a gear-type speed change mechanism of the transmission 16 and distributed to the left and right front wheels 10 and the left and right rear wheels 11 (corresponding to the "running device" of the present invention). As a result, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0041] 2 and 3, the tractor is equipped with a mid PTO shaft 17 and a rear PTO shaft 18. The rotational power output from the motor M is distributed to the hydraulic pump 15a, the mid PTO shaft 17, and the rear PTO shaft 18. This causes the mid PTO shaft 17 and the rear PTO shaft 18 to rotate.

[0042] If a working device is connected to the mid PTO shaft 17 or the rear PTO shaft 18, the working device is driven by the rotational power of the mid PTO shaft 17 or the rear PTO shaft 18. For example, as shown in Fig. 2, in this embodiment, a grass cutting device 19 is connected to the mid PTO shaft 17. The grass cutting device 19 is driven by the rotational power of the mid PTO shaft 17.

[0043] [About the configuration of the driving battery] As shown in Figure 4, the driving battery 4 provided on the tractor body includes a power storage unit 4A for storing electric power, a battery cover 4B for housing the power storage unit 4A, and an upper cover 4C provided on top of the battery cover 4B and covering a number of cooling fans 51 that cool the power storage unit 4A, etc.

[0044] As shown in Fig. 6, the front wall 4Bf of the battery cover 4B is provided with a thick portion 41 that is thicker than other portions of the battery cover 4B. The surface of the thick portion 41 extends in the vertical and horizontal directions of the body. The thick portion 41 is made of a separate member from the battery cover 4B and is made of an aluminum plate-shaped member.

[0045] 5 and 6, the thick portion 41 is supported by the battery cover 4B via a mounting member 42. The mounting member 42 is fastened to the front wall portion 4Bf by a plurality of bolts. The thick portion 41 is fastened to the mounting member 42 by a plurality of bolts.

[0046] A front portion of the thick portion 41 is provided with a plurality of connection portions 43 to which a harness H (corresponding to "electrical wiring" according to the present invention) for inputting and outputting power of the driving battery 4 is detachably connected. The plurality of connection portions 43 are arranged, in order from the right side of the vehicle body, as a connection portion 43a for connecting a harness Ha for charging the power supplied from an external power source (not shown) to the power storage unit 4A, a connection portion 43b for connecting a harness Hb for outputting power from the power storage unit 4A to the inverter 14, a connection portion 43c for connecting a harness Hc for outputting power from the power storage unit 4A to a DC-DC converter (not shown), and a connection portion 43d for connecting a harness Hd for inputting power for driving the cooling fan 51.

[0047] Here, the DC-DC converter adjusts the magnitude of the DC voltage of the power storage unit 4A and outputs it. The power output from this DC-DC converter is input to the connection unit 43d via the harness H, for example, and is used to drive the cooling fan 51.

[0048] The connection portion 43a, the connection portion 43b, the connection portion 43c, and the connection portion 43d are each fastened and fixed by a plurality of bolts.

[0049] As shown in FIG. 6, a through hole 44 is formed in the thick portion 41 to pass the wiring passing through the inside of the connection portion 43c into the inside of the battery cover 4B, and further, an opening is formed in the mounting member 42 at a position corresponding to the through hole 44.

[0050] The connecting portion 43c is provided with a sealant 47 on a surface facing the thick portion 41. The sealant 47 is configured to abut so as to surround the outer periphery of the insertion hole 44 in the thick portion 41 when the connecting portion 43c is fastened and fixed to the thick portion 41. With this configuration, even if water gets between the connecting portion 43c and the thick portion 41, the water is blocked by the sealant 47, and it is possible to prevent the water from getting into the battery cover 4B through the insertion hole 44. The connecting portions 43a, 43b, and 43d are also provided with a configuration similar to that of the connecting portion 43c.

[0051] [Configuration of the pressure adjustment unit] As shown in Figs. 5 and 6, a pressure adjusting portion 45 for adjusting the air pressure inside the battery cover 4B is provided on a surface of the thick portion 41 along the vertical direction.

[0052] The pressure adjustment unit 45 has a membrane filter that allows air to pass through but does not allow water to pass through. For example, when the temperature of the electricity storage unit 4A drops and the air pressure inside the battery cover 4B drops, pressure is applied to the membrane filter from the outside air side due to the air pressure difference with the outside air pressure. The pressure adjustment unit 45 is configured so that the mesh of the membrane filter is expanded by the pressure from the outside air side, allowing air to pass through.

[0053] The pressure adjusting portion 45 is provided below the connection portion 43c of the thick portion 41, and the pressure adjusting portion 45 and the connection portion 43c are arranged to be aligned in the up-down direction. The connection portion 43c is configured to be connected to the harness Hc in a state where the connected harness Hc extends downward. With this configuration, the pressure adjusting portion 45 is configured to be provided at a position aligned in the horizontal direction with the harness Hc connected to the connection portion 43c, and the pressure adjusting portion 45 and the harness Hc overlap when viewed in the front-rear direction.

[0054] 6, the thick portion 41 has a recess 46 recessed from an outer surface 41a of the thick portion 41 toward the inside of the battery cover 4B. A through hole 46a is formed at the bottom of the recess 46, penetrating to the inside of the battery cover 4B. An opening is formed in the mounting member 42 at a location corresponding to the through hole 46a. This configuration allows air to move between the inside and outside of the battery cover 4B via the pressure adjustment unit 45.

[0055] The outer side surface 45a of the pressure adjusting portion 45 and the outer surface 41a of the thick portion 41 are configured to be at substantially the same position in the front-rear direction of the aircraft body. In addition, the pressure adjusting portion 45 and the outer surface 41a of the thick portion 41 are configured to have a gap S therebetween.

[0056] [Another embodiment] Hereinafter, another embodiment in which the above embodiment is modified will be described.

[0057] (1) In the above embodiment, the thick portion 41 is described as being made of a separate material from the battery cover 4B. However, the present invention is not limited to the above embodiment, and the thick portion 41 may be made integral with the battery cover 4B.

[0058] (2) In the above embodiment, the thick portion 41 is described as being provided on the front wall portion 4Bf of the battery cover 4B as an example, but the present invention is not limited to the above embodiment, and the thick portion 41 may be provided on the left and right side wall portions or the bottom wall portion of the battery cover 4B, etc.

[0059] (3) In the above embodiment, the thick portion 41 is described as being composed of an aluminum plate-like member. However, the present invention is not limited to the above embodiment. For example, the thick portion 41 may be composed of a plate-like member made of another metal such as stainless steel, or may be composed of a resin plate-like member.

[0060] (4) In the above embodiment, the thick portion 41 is provided with one each of the connection portion 43a, the connection portion 43b, the connection portion 43c, and the connection portion 43d in this order from the right side of the vehicle body, but the present invention is not limited to the above embodiment. For example, the connection portion 43a, the connection portion 43b, the connection portion 43c, and the connection portion 43d may each be provided in a plurality of parts as spare parts. In addition, the connection portion 43a, the connection portion 43b, the connection portion 43c, and the connection portion 43d may be configured in a different arrangement from that in the above embodiment. In addition, the connection portion 43 may be connected to a harness H for inputting and outputting power to and from the driving battery 4, and may be connected to a harness H for purposes other than those of the above embodiment.

[0061] (5) In the above embodiment, the pressure adjustment unit 45 has been described as having a membrane filter as an example. However, the present invention is not limited to the above embodiment and may be configured, for example, by a pressure adjustment valve.

[0062] (6) In the above embodiment, the pressure adjustment unit 45 is arranged in a position aligned horizontally with the harness H connected to the connection portion 43c, but the present invention is not limited to the above embodiment. The pressure adjustment unit 45 may be arranged in a position aligned horizontally with the harness H connected to the connection portion 43a, the connection portion 43b, or the connection portion 43d.

[0063] (7) In the above embodiment, a configuration in which a recess 46 is formed in the thick portion 41 and a pressure adjustment portion 45 is provided in the recess 46 is described as an example. However, the present invention is not limited to the above embodiment, and a configuration not having the recess 46 may also be used.

[0064] (8) In the above embodiment, the pressure adjustment portion 45 and the outer surface 41a of the thick portion 41 are described as having a gap S therebetween, but the present invention is not limited to the above embodiment, and the pressure adjustment portion 45 and the outer surface 41a of the thick portion 41 may be configured not to have a gap S.

[0065] The configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, unless a contradiction occurs. In addition, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these embodiments, and can be appropriately modified within the scope of the present invention. [Industrial Applicability]

[0066] The present invention can be used not only in tractors, but also in various electric work vehicles such as combine harvesters, rice transplanters, and construction machines. [Explanation of symbols]

[0067] 4. Driving battery (battery) 4A Power storage unit 4B Battery cover 4Bf Front wall 14 Inverter 41 Thick part 41a Outer surface 43 Connection 45 Pressure adjustment section 46 Recessed 51 Cooling fan H Harness (electrical wiring) Medium motor S Gap

Claims

1. The battery installed in the aircraft, a motor driven by power supplied from the battery; A traveling device driven by the motor; a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected; the battery includes a power storage unit that stores electric power and a battery cover that houses the power storage unit; the battery cover has a thick portion that is thicker than other portions of the battery cover, The connection portion is provided on the thick portion, An electric work vehicle, wherein one of the thick portions is provided with a plurality of the connection portions.

2. A battery mounted on the aircraft; a motor driven by power supplied from the battery; A traveling device driven by the motor; a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected; the battery includes a power storage unit that stores electric power and a battery cover that houses the power storage unit; the battery cover has a thick portion that is thicker than other portions of the battery cover, The connection portion is provided on the thick portion, In an electric work vehicle, the thick portion is provided on a wall portion extending in the vertical direction and is composed of a plate-shaped member that is thicker than the wall portion.

3. A battery mounted on the aircraft; a motor driven by power supplied from the battery; A traveling device driven by the motor; a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected; the battery includes a power storage unit that stores electric power and a battery cover that houses the power storage unit; the battery cover has a thick portion that is thicker than other portions of the battery cover, The connection portion is provided on the thick portion, The thick portion is provided on a front wall portion of the battery cover, An electric work vehicle, wherein the plurality of connection portions are provided on a front portion of the thick portion.

4. 4. The electric work vehicle according to claim 1, wherein at least one of the plurality of connection parts is a connection part for connecting an electric wiring for charging the power storage unit with electric power supplied from an external power source.

5. an inverter that converts DC power from the power storage unit into AC power and supplies the AC power to the motor; 5. The electric work vehicle according to claim 1, wherein at least one of the plurality of connection parts is a connection part for connecting an electric wiring for outputting electric power from the power storage unit to the inverter.

6. A DC-DC converter is provided to adjust the magnitude of the DC voltage of the power storage unit and output the adjusted voltage, 6. The electric work vehicle according to claim 1, wherein at least one of the plurality of connection parts is a connection part that connects an electric wiring for outputting electric power from the power storage unit to the DC-DC converter.

7. A battery mounted on the aircraft; a motor driven by power supplied from the battery; A traveling device driven by the motor; a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected; the battery includes a power storage unit that stores electric power and a battery cover that houses the power storage unit; the battery cover has a thick portion that is thicker than other portions of the battery cover, The connection portion is provided on the thick portion, The battery is provided with a cooling fan that cools the power storage unit, At least one of the multiple connection parts is a connection part for connecting electrical wiring for inputting power to drive the cooling fan.

8. A battery mounted on the aircraft; a motor driven by power supplied from the battery; A traveling device driven by the motor; a plurality of connection parts to which electrical wiring for inputting and outputting power of the battery is detachably connected; the battery includes a power storage unit that stores electric power and a battery cover that houses the power storage unit; the battery cover has a thick portion that is thicker than other portions of the battery cover, The connection portion is provided on the thick portion, A pressure adjusting unit is provided to adjust the air pressure inside the battery cover, The pressure adjusting portion is provided in the thick portion of the electric work vehicle.

9. The electric work vehicle according to claim 8 , wherein the pressure adjusting portion is provided on a surface of the thick portion extending in a vertical direction.

10. The thick portion is provided with a recessed portion recessed from an outer surface of the thick portion toward an inside of the battery cover, 10. The electric work vehicle according to claim 8 or 9, wherein the pressure adjusting portion is provided in the recessed portion with a gap between an outer surface of the thick-walled portion and the pressure adjusting portion.

11. The electric work vehicle according to claim 8 , wherein the pressure adjustment portion is provided in a position aligned horizontally with an electrical wiring connected to any one of the plurality of connection portions.

Images