JP6523927B2 - Battery pack for electrically powered work vehicle and electrically powered work vehicle - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a battery pack for an electrically-driven work vehicle that travels and runs by an electric motor, and an electrically-operated work vehicle equipped with the battery pack.

  In the field of passenger cars, electric vehicles that travel by the rotational force of an electric motor are beginning to spread. At that time, a battery is mounted on the vehicle as a power source of the electric motor. In order to maintain the performance of the battery, it is often necessary to provide the battery with a cooling structure since it is necessary to keep the battery temperature at an appropriate temperature. For example, in a battery pack for a vehicle according to Patent Document 1, a battery cell group consisting of a plurality of battery cells and a cooling fan for flowing air to the battery cell group are housed in a case. The case is further formed with an inlet for introducing air into the case from the outside, and an outlet for discharging air to the outside of the case. An air flow generated by the rotational drive of the cooling fan passes through a gap between the battery cells and an intake passage extending to a bottom space between the inner bottom surface of the case and the bottom surface of the battery cells. That is, the cooling air introduced into the case from outside the vehicle through the suction port is discharged from the discharge port to the outside of the case through the intake flow passage, the bottom space, and the gap between the batteries. Furthermore, a plurality of radiation fins projecting downward are provided on the lower surface of the case.

  However, in a work vehicle that travels while working, such as a mower, rice transplanter, or tractor, the surrounding environment during work travel is worse than the surrounding environment such as a car, and cooling air is taken in from the surroundings The cooling air is likely to be mixed with dust such as cut grass and moss, and causes problems such as clogging of the cooling air passage.

JP, 2014-075181, A

  In view of the above-mentioned situation, there is a demand for a battery pack having a structure suitable for an electric working vehicle that travels in an ambient environment in which foreign substances such as grass and moss are floating. At that time, when such a battery pack includes a plurality of battery modules, it is also important to make the temperature of each battery module as uniform as possible.

A battery pack for an electrically operated vehicle according to the present invention divides a sealed battery case including a front case portion and a rear case portion, and divides the inside of the front case portion into a first space and a second space in the vertical direction. At the same time, a horizontal partition wall that divides the inside of the rear case portion vertically into the third space and the fourth space, and the first space, the second space, the third space, and the fourth space A battery electrical unit housed in one space; and a battery module housed in each of the remaining spaces among the first space, the second space, the third space, and the fourth space; Cooling fins are formed on the side wall surface of the battery case, and a circulation fan is provided which creates a longitudinal air flow circulating through the first space, the second space, the third space, and the fourth space. And the circulation Emissions are housed in the same space as the electric unit for the battery.
In the battery pack for an electrically operated vehicle according to the present invention, a sealed battery case including a front case portion and a rear case portion, and a first space and a second space in the vertical direction inside the front case portion. A horizontal partition wall which divides the inside of the rear case portion into the third space and the fourth space in the vertical direction while dividing the space, the first space, the second space, the third space, and the fourth space A battery electrical unit housed in one of the spaces, and a battery module housed in the remaining spaces among the first space, the second space, the third space, and the fourth space; A circulation fan for creating a longitudinal air flow circulating through the first space, the second space, the third space, and the fourth space, the circulation fan being the same space as the battery electrical unit Stored in To have.

In addition, the above-mentioned "sealed" does not mean that the internal space of the battery case is maintained in a completely airtight state, but the flow of the outside air to the internal space is suppressed, and the outside air temperature and the temperature of the internal space are simple. The term is used as a term that has a broad meaning, including even a loose airtight state that is not balanced.
Also, the terms first space, second space, third space, fourth space do not limit the number of divided spaces to four, and the battery case further includes a fifth space, a sixth space,.・ Division may be made.

  In this configuration, the inside of the sealed battery case is divided into a plurality of spaces by the horizontal partition wall, the battery electrical unit is disposed in one of the spaces, and the battery electrical unit is disposed in the remaining space. . As a result, substantially no dust such as cut grass or moss does not enter the inside of the battery case. In addition, since the inside of the battery case is divided up and down by the horizontal partition wall, the heat released from the plurality of battery modules is prevented from being concentrated on the ceiling area of the battery case.

  As a particularly preferred embodiment, a circulating fan is provided which creates a longitudinal air flow circulating through the first space, the second space, the third space and the fourth space. In this configuration, the plurality of battery modules and the circulation fan are hermetically housed in one battery case, and the circulation of air in the case inner space by the circulation fan and the suppression of the entry of outside air by the sealing of the battery case are external The temperature of the space in the case is equalized while the entry of foreign matter from the case is suppressed. At that time, if the electrical unit and the battery module are arranged such that the cooling air created by the circulating fan passes through the electrical unit and each battery module in order, the temperature distribution of each battery module becomes as uniform as possible . As a result, the temperature distribution of the battery modules can be easily made uniform, and each battery module operates electrically efficiently.

  The right of the present invention extends to an electric working vehicle equipped with the above-described battery pack.

It is a partially broken perspective view showing the basic structure of a battery pack. It is the side which shows typically the example of basic installation to the electric work vehicle of a battery pack. It is a plane which shows typically the example of basic installation to the electric work vehicle of a battery pack. It is a side view of a riding type electric mower which is one of the embodiments of an electric work vehicle. It is a top view of a riding type electric mower. It is a perspective view showing a body frame, a battery pack, and a drive mechanism of a rear wheel unit. It is a perspective view of a battery pack. It is a cross-sectional view of a battery pack. It is an exploded view of a battery case.

  Before describing a specific embodiment of the battery pack relating to the present invention, referring to FIG. 1, the basic structure of the battery pack mounted on the electric working vehicle will be described using FIG. 2 and FIG. The basic arrangement of the battery pack when mounting such a battery pack on an electric work vehicle will be described. In this specification, the longitudinal direction of the vehicle body is the direction of the vehicle body central axis (also referred to as the longitudinal axis of the vehicle body) extending horizontally along the traveling direction of the vehicle body on which the battery pack is mounted. The direction (also referred to as “direction”) is a direction extending in the horizontal direction orthogonal to the vehicle body central axis. "Forward (forward)" means the forward side in the vehicle longitudinal direction, and "rear (backward)" means the reverse side in the longitudinal direction. "Left (left)" means the left in the forward direction of the vehicle body, and "right (right)" means the right in the forward direction of the vehicle.

  The battery pack 6 shown in FIG. 1 includes a battery case 60, a horizontal partition wall 63, a battery electrical unit 68 (simply referred to simply as an electrical unit 68), and a plurality of battery modules 6A. The battery case 60 is a sealed case including a front case portion 61 and a rear case portion 62. In FIG. 1, the left side facing the drawing is defined as the front side (front) and the right side is defined as the rear side (rear). The front case portion 61 and the rear case portion 62 are not separate members, but are the names when the battery case 60 is considered separately in the front portion and the rear portion, and the front case portion 61 and the rear case portion It becomes a battery case 60 by being connected with 62. In the example shown in FIG. 1, the transition area from the front case portion 61 to the rear case portion 62 is inclined upward. As a result, the rear case portion 62 is offset upward in the vertical direction with respect to the front case portion 61, and the battery case 60 is a solid body having an upper level difference in the middle. This level difference is required from the restriction of the form of use, etc., and may have a lower level difference or may not have a level difference.

  The horizontal partition wall 63 is a plate provided so as to substantially divide the inside of the battery case 60 into upper and lower portions. By the horizontal partition wall 63, the inside of the front case portion 61 is vertically divided into a first space S1 and a second space S2, and the inside of the rear case portion is vertically formed a third space S3 and a fourth space S4. Divided into The first space S1 and the third space S3 communicate with each other to form an upper space of the battery case. Similarly, the second space S2 and the fourth space S4 communicate with each other to form a lower space of the battery case. A front end of the horizontal partition wall 63 opens a gap 63a between the first space S1 and the second space S2 between the front wall of the horizontal partition wall 63 and the first wall S2. The rear end of the horizontal partition wall 63 opens a gap 63 b between the third space S 3 and the fourth space S 4 between the rear partition of the horizontal partition wall 63 and the rear wall surface of the horizontal partition wall 63. Thus, an air circulation path is formed in the battery case 60 from the first space S1 through the second space S2 to the fourth space S4 to the third space S3 to return to the first space S1.

In the example of FIG. 1, the electrical unit 68 is disposed in the first space S1, and one battery module 6A is disposed in each of the second space S2, the third space S3, and the fourth space S4.
The battery module 6A is composed of a large number of battery cells 6a. Furthermore, a circulation fan 49 is disposed in the first space S1 so as to send the air from the first space S1 to the third space S3. Thereby, a flow path of circulating air through which the air passes in the order of the first space S1 to the third space S3 to the fourth space S4 to the second space S2 to the first space S1 is created. The flow of the circulating air not only cools the electrical unit 68, but also makes the temperatures of the second space S2, the third space S3 and the fourth space S4 in which the battery module 6A is disposed uniform. This prevents the malfunction of the battery module 6A due to the uneven temperature distribution.

  The battery case 60 is configured to be at least partially removable, or an opening closed by a lid is formed, for maintenance inspection of the electrical unit 68 and each battery module 6A.

  FIG. 2 and FIG. 3 are side views for explaining a basic installation example of the battery pack 6 shown in FIG. 1 on the electrically powered work vehicle. This electric work vehicle includes a vehicle body including a left frame 21 and a right frame 22 extending in the vehicle body longitudinal direction at intervals in the vehicle body transverse direction, and at least one cross beam 23 connecting the left frame 21 and the right frame 22. A frame 20 is provided. The left front wheel 11L and the right front wheel 11R that constitute the front wheel unit are disposed at the front of the body frame 20. The left rear wheel 12L and the right rear wheel 12R that constitute the rear wheel unit are disposed on the rear side of the center of the vehicle body frame 20. In the following, when it is not necessary to distinguish between left front wheel 11L and right front wheel 11R, the phrase front wheel unit 11 is used as a generic term for left front wheel 11L and right front wheel 11R, and rear wheel 12L and right rear wheel 12R are generically referred to as rear wheels The phrase unit 12 is used. The rear axle center Pr extends in the cross direction of the vehicle body.

  The battery pack 6 is disposed between the left frame 21 and the right frame 22 in the rear half area of the vehicle body frame 20, and the front end of the battery pack 6 is generally forward of the rear axle center Pr and substantially rear wheels Located near the front end of the unit 12. The rear end of the battery pack 6 is located substantially at the rear end of the vehicle body frame 20. As apparent from FIG. 3, the battery pack 6 has a width that fits approximately perfectly between the left frame 21 and the right frame 22 and extends in the longitudinal direction of the vehicle with equal width. Further, as apparent from FIG. 2, the front half of the battery pack 6 is in the axle space of the rear wheel unit 12. A particularly preferable arrangement of the battery pack 6 is that the center of gravity of the battery pack 6 is within the distance from the rear axle center to the rear wheel 12 in the vehicle longitudinal direction centerline and in the vehicle longitudinal direction. Thereby, the weight of the battery pack 6 contributes to the stability of the vehicle body.

  Furthermore, the battery pack 6 has a shape in which the rear case portion 62 is shifted upward with respect to the front case portion 61 in the vertical direction. Therefore, the ground height Hb of the rear case portion 62 of the battery pack 6 is higher than the ground height Hf of the front case portion 61 of the battery pack 6. In the example shown in FIG. 2, the ground height Hf of the front case portion 61 is substantially the same as the ground height of the lower end of the rear axle case 31 of the rear wheel unit 12. The ground height Hb of the rear case portion 62 of the battery pack 6 is higher than the ground height of the rear axle case 31 and substantially the same as the ground height of the rear axle center Pr. The minimum ground height of the vehicle body frame 20 in the portion supporting the battery pack 6 substantially matches the minimum ground height of the battery pack 6. When the ground height Hf of the front case portion 61 is set low, the center of gravity of the battery pack 6 is lowered, and the running stability is improved. Further, since the ground height Hb of the rear case portion 62 is set high, there is a low possibility that the rear end of the battery pack 6 or the vehicle body frame 20 contacts the ground or stones when traveling uphill or traveling on rough roads. .

  The left motor 4L for transmitting rotational power to the left rear wheel 12L is disposed around the left rear wheel 12L near the front case portion 61 of the battery pack. The right motor 4R for transmitting rotational power to the right rear wheel 12R is disposed in the vicinity of the rear case portion 62 and around the right rear wheel 12R. The left motor 4L and the right rear wheel 12R are disposed at symmetrical positions. In order to create an arrangement space for the left motor 4L and the right motor 4R, the portion covering the first space S1 of the front case portion 61 may be recessed. A driver's seat 16 is disposed above the left motor 4L and the right motor, and a space is effectively used.

  In the battery pack 6 illustrated in FIG. 1, the front rectangular solid portion 6F of the battery pack 6 is a convex extending in the longitudinal direction of the vehicle body in such a manner that the upper right portion and the upper left portion are missing. Central portion 6Fc of the From this, a space is created on the left and right of the central portion 6Fc. The left motor 4L enters the space on the left side of the central portion 6Fc of the front rectangular parallelepiped portion 6F, and the right motor 4R enters the space on the right side of the central portion 6Fc.

  Next, one of the specific embodiments of the electric working vehicle on which the battery pack is mounted will be described using the drawings. FIG. 4 is a side view of a riding electric mower as an example of the electric working vehicle, and FIG. 5 is a plan view of the riding electric mower.

  As shown in FIGS. 4 and 5, a riding electric mower (hereinafter simply referred to as a mower) includes a vehicle body 10, and the vehicle body 10 is a caster type comprising a left front wheel 11L and a right front wheel 11R. It is supported on the ground by the front wheel unit 11 and the rear wheel unit 12 composed of the left rear wheel 12L and the right rear wheel 12R which are rotationally driven. The vehicle body 10 has a vehicle body frame 20 as a base frame. The vehicle body frame 20 includes a left frame 21, a right frame 22, and a cross beam 23 connecting the left frame 21 and the right frame 22. The mower unit 13 is suspended from the vehicle body frame 20 through the link mechanism 14 between the front wheel unit 11 and the rear wheel unit 12. The mower unit 13 is provided with a blade transmission mechanism 131 and a blade 132 rotated by the blade transmission mechanism 131. A driver's seat 16 is disposed in a central region in the front-rear direction of the vehicle body 10. The basic structure of the battery pack 6 and the basic arrangement in the vehicle body frame 20 adopt the contents described with reference to FIGS. 1 and 2.

  FIG. 6 is a perspective view showing the vehicle body frame 20, the battery pack 6, and the drive mechanism of the rear wheel unit 12. As shown in FIG. A drive mechanism for supplying rotational power to the rear wheel unit 12 includes a motor 4, a transmission case 30, and a rear axle case 31. As shown in FIG. 6, the left frame 21 and the right frame 22 branch upward and downward from the middle area and are connected again in the rear area. That is, the left frame 21 includes the upper frame portion 21a and the lower frame portion 21b in the rear half area. Similarly, the right frame 22 includes an upper frame portion 22a and a lower frame portion 22b in the rear half area. In a side view, the left transmission case 30L is disposed in the region between the upper frame portion 21a and the lower frame portion 21b of the left frame 21, and in the region between the upper frame portion 22a and the lower frame portion 22b of the right frame 22. The right transmission case 30R is disposed. The left rear axle case 31L is connected to the left transmission case 30L, and the left rear wheel 12L is supported by the left rear axle case 31L. A right rear axle case 31R is connected to the right transmission case 30R, and the right rear wheel 12R is supported by the right rear axle case 31R. The left rear axle case 31L is a cylindrical body that supports the bearing by supporting the left rear axle 41 of the left rear wheel 12L, and its outer shape is a truncated cone shape. Similarly, the right rear axle case 31R is a cylindrical body that supports the bearing by supporting the right rear axle 42 of the right rear wheel 12R, and the outer shape is a truncated cone shape. In the battery pack 6, the center of gravity of the battery pack 6 is approximately located on the longitudinal centerline of the vehicle body in plan view, and is within the length of the rear wheel radius on the front and rear sides from the rear axle center Pr. It is arranged.

  The left transmission case 30L is a hollow body extending forward from the left rear axle case 31L in the front-rear direction of the vehicle body so as to be orthogonal to the rear axle center Pr which is also a central axial center of the left rear axle case 31L. The left transmission consisting of A mounting surface of the left motor 4L is formed on the power input portion 32f of the left transmission case 30L. Similarly, it is a hollow body extending forward from the right rear axle case 31R in the front-rear direction of the vehicle body so as to be orthogonal to the rear axle center Pr, which is also the central axis of the right rear axle case 31R. The transmission is equipped. The gear transmission mechanism generally decelerates the input power, but may accelerate or may not accelerate or decelerate. A mounting surface of the right motor 4R is formed on the power input portion 32f of the right transmission. In this embodiment, the left transmission case 30L and the left rear axle case 31L are integrally configured, and the right transmission case 30R and the right rear axle case 31R are integrally configured. As the left transmission and the right transmission, instead of the gear transmission mechanism, a chain electric mechanism, a transmission shaft mechanism, or the like may be employed.

  A shift operation for the left motor 4L and the right motor 4R is performed by a pair of shift levers 18 (see FIGS. 4 and 5) disposed on both sides of the driver seat 16. When the shift lever 18 is held at the back and forth neutral position, the corresponding motor 4 is stopped, and by operating the shift lever 18 forward from the neutral position, the corresponding motor 4 is driven forward to realize forward shift, By operation, the corresponding motor 4 is driven backward to realize reverse gear shift. By independent operation of the pair of left and right shift levers 18, the left motor 4L and the right motor 4R are controlled independently for variable speed drive. For example, when the pair of left and right shift levers 18 are operated with substantially the same amount of operation from the neutral position in the forward direction, both the left rear wheel 12L and the right rear wheel 12R are driven at substantially the same speed, and the vehicle body 10 advances straight ahead . When the pair of left and right shift levers 18 is operated from the neutral position by substantially the same operation amount in the rearward direction, the left rear wheel 12L and the right rear wheel 12R are driven in the reverse direction at substantially the same speed, and the vehicle body 10 goes straight forward . Furthermore, when the pair of left and right shift levers 18 are operated with different operation amounts, the left rear wheel 12L and the right rear wheel 12R are driven at different speeds, and the vehicle body 10 turns. At that time, it is possible to make a small turn by turning either one of the left rear wheel 12L and the right rear wheel 12R to a low speed close to zero speed and operating the other at high speed forward or backward. Furthermore, by driving the left rear wheel 12L and the right rear wheel 12R in opposite directions to each other, the vehicle body 10 can be spin-turned with the substantially central portion of the rear wheel unit 12 as the turning center.

Hereinafter, the battery pack 6 will be described with reference to FIGS. 6, 7, 8, and 9. The battery pack 6 includes a plurality of battery modules 6A housed in a battery case 60.
In the description of the basic configuration of the battery pack 6 using FIGS. 1, 2 and 3, the battery pack 6 is handled as an integrated battery case 60 and battery module 6 A. The front half of the battery pack 6 is defined as the front side rectangular parallelepiped portion 6F, and the rear half of the battery pack 6 is defined as the rear side rectangular parallelepiped portion 6B. Further, a convex central portion 6Fc is formed in the upper half of the front rectangular parallelepiped portion 6F, the left motor 4L is disposed in the space on the left side of the central portion 6Fc, and the right motor 4R in the space on the right side of the central portion 6Fc. It is intruding. Such an arrangement is also employed in this embodiment. However, in the description of the battery pack 6 here, respective structures of the battery case 60 and the battery module 6A which are originally separate bodies will be described separately.

  The battery case 60 is a molded product of two upper and lower parts, and includes an upper case 60 a and a lower case 60 b. However, in order to facilitate the description of the internal structure, the battery case 60 is divided into the front case portion 61 and the rear case portion 62.

  The front case portion 61 is a solid body in which a convex central portion 611 is formed at the top by recessing the upper left portion and the upper right portion from a rectangular solid. In other words, the length in the transverse direction of the machine is short so that a motor storage space in which the left motor 4L and the right motor 4R enter is formed on both sides of the central portion 611 in the machine transverse direction. The rear case portion 62 is a rectangular parallelepiped connected to the front case portion 61 in the front-rear direction. The front case portion 61 and the rear case portion 62 are connected in a posture in which the rear case portion 62 is shifted upward, and the battery case 60 has a three-dimensional shape having upper and lower steps on the front side and the rear side. The central portion 611 has an enlarged portion 612 which is enlarged in the left, right, and upper directions in the connection area between the front case portion 61 and the rear case portion 62, and the internal space is expanded in the enlarged portion 612.

  The rear case portion 62 has a rectangular parallelepiped shape having the same width (length in the vehicle body transverse direction) as the front case portion 61. The rear case portion 62 is shifted upward with respect to the front case portion 61, whereby the battery case 60 has a step cube shape having a step between the front case portion 61 and the rear case portion 62. .

  As shown in FIGS. 8 and 9, inside the battery case 60 divided into the upper case 60a and the lower case 60b, a horizontal partition that divides the inside into upper and lower parts across the front case portion 61 and the rear case portion 62 A wall 63 is provided. The inside of the front case portion 61 is divided into the upper first space S1 and the lower second space S2 by the horizontal partition wall 63, and the inside of the rear case portion 62 is the upper third space S3 and the lower side. It is divided into the fourth space S4. The horizontal partition wall 63 is a plate member, and is formed to have the same vertical difference as the battery case 60 through bending, and the second space S2, the third space S3, and the fourth space S4 have substantially the same shape and volume. It has become. The first space S1 is smaller in width and height than the other spaces. A vertical partition wall 64 is provided between the first space S1 and the third space S3.

  A battery module 6A having the same specification is accommodated in each of the second space S2, the third space S3, and the fourth space S4. As shown in FIG. 9, the battery module 6A is a rectangular solid whose height is smaller than the vertical dimension and the horizontal dimension. A large number of battery cells 6a are accommodated inside the battery module 6A.

The first space S1 accommodates an electrical unit 68 including a relay, a fuse, and the like provided on a power line connecting the battery module 6A to the outside. The vertical partition wall 64 is provided with a circulation fan 69 which sucks the air in the first space S1 and sends it to the third space S3.
The electrical system of the circulation fan 69 is incorporated in the electrical unit 68. A front end gap G1 is formed between the front end 63a and the front case portion 61 of the horizontal partition wall 63, and a rear end gap G2 is formed between the rear end 63b and the rear case portion 62. Furthermore, the battery case 60 has an enclosed structure to such an extent that grass or dust does not enter the interior space from the outside or air circulation between the interior space and the outside is suppressed. As a result, the circulation air flow from the circulation fan 69 to the inside of the battery case 60 passes through the third space S3, the fourth space S4, and the second space S2, reaches the first space S1, and returns to the circulation fan 69. A channel (indicated by the arrow in FIG. 8) is formed. The circulation air flowing through the circulation air flow path equalizes the temperatures of the four spaces of the battery case 60. Also, the electrical unit 68 is cooled by such circulating air. In order to enhance the cooling effect, fins 60f are formed on the wall surface of the battery case 60 although only partially shown. The fins 60 f can be formed on the inner and / or outer wall surfaces of the battery case 60.

  The upper wall of the front case portion 61 is provided with an opening for maintenance inspection of the electrical unit 68 and is normally closed by a lid 613.

  As shown in FIG. 4, in this embodiment, a working motor 4W for powering the mower unit 13 as a working device is disposed at the rear of the mower unit 13, and the power from the working motor 4W is a blade via a belt. It is transmitted to the transmission mechanism 131. Instead of this, the working motor 4W can be disposed on the front side of the battery pack 6. At that time, the PTO shaft including the output shaft from the working motor 4W and the relay shaft is extended forward in the longitudinal direction of the vehicle body, and the power from the working motor 4W is transmitted through the PTO shaft. It is transmitted to the blade transmission mechanism 131.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a battery pack mounted on an electrically operated work vehicle such as an electrically-operated mower, an electrically-driven rice planter, an electrically-powered tractor, and such an electrically-operated work vehicle.

4: motor 4L: left motor 4R: right motor 10: vehicle body 11: front wheel unit 12L: left rear wheel 12R: right rear wheel 13: mower unit 20: body frame 21: left frame 22: right frame 30L: left transmission case 30R : Right transmission case 31L: Left rear axle case 31R: Right rear axle case 6: Battery pack 6B: Rear rectangular solid 6F: Front rectangular solid 6Fc: Center 6A: Battery module 6a: Battery cell 60: Battery case 60a: Top Case 60b: lower case 60f: fin 611: central portion 612: enlarged portion 613: lid 61: front case portion 62: rear case portion 63: horizontal partition wall 64: vertical partition wall 68: electrical unit 69: circulating fan

Claims (6)

A sealed battery case consisting of a front case and a rear case;
A horizontal partition wall that divides the inside of the front case portion vertically into the first space and the second space, and divides the inside of the rear case portion vertically into the third space and the fourth space,
A battery electrical unit accommodated in one of the first space, the second space, the third space, and the fourth space;
A battery module housed in each of the remaining spaces among the first space, the second space, the third space, and the fourth space;
Cooling fins are formed on the side wall surface of the battery case ,
A circulation fan is provided to create a longitudinal air flow circulating through the first space, the second space, the third space, and the fourth space.
The battery pack for an electrically operated vehicle, wherein the circulating fan is housed in the same space as the battery electrical unit . A sealed battery case consisting of a front case and a rear case;
A horizontal partition wall that divides the inside of the front case portion vertically into the first space and the second space, and divides the inside of the rear case portion vertically into the third space and the fourth space,
A battery electrical unit accommodated in one of the first space, the second space, the third space, and the fourth space;
A battery module housed in each of the remaining spaces among the first space, the second space, the third space, and the fourth space;
A circulation fan is provided to create a longitudinal air flow circulating through the first space, the second space, the third space, and the fourth space.
The battery pack for an electrically operated vehicle, wherein the circulating fan is housed in the same space as the battery electrical unit. The rear case portion is offset upward with respect to the front case portion, and the battery case has a three-dimensional shape in which a step is formed between the front case portion and the rear case portion. The battery pack for electrically powered work vehicles according to 1 or 2 . The battery pack for an electric work vehicle according to any one of claims 1 to 3 , wherein the battery case is provided with an opening which exposes the battery electrical unit to the outside and is closed by a lid. The battery pack for an electric working vehicle according to any one of claims 2 to 4 , wherein a cooling fin is formed on a wall surface of the battery case. An electric working vehicle equipped with the battery pack for an electric working vehicle according to any one of claims 1 to 5 ,
A left frame and a right frame are provided, spaced apart in the cross direction of the vehicle and extending in the longitudinal direction of the vehicle,
The battery pack includes a front end portion of the battery pack between a left rear wheel disposed outside the vehicle body in the lateral direction of the left frame and a right rear wheel disposed outside the vehicle body in the transverse direction of the right frame. An electric work vehicle arranged so that it is located forward of the axle center of the rear wheel unit.

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