JP2013038011A - Electricity storage device and work machine equipped with electricity storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electricity storage device hardly causing short-circuit between electrodes even when dew condensation occurs therein.SOLUTION: In the electricity storage device, an electricity storage laminate including a plurality of electricity storage cells connected in series is attached on a bottom plate. A top plate is arranged at the upper side of the electricity storage laminate. The top plate is fixed to the bottom plate. An inner side surface of the top plate is inclined with respect to the bottom plate at the upper side of the electricity storage laminate.

Description

  The present invention relates to a power storage device and a work machine equipped with the power storage device.

  A power storage device used in a hybrid work machine or the like is charged and discharged with a large current, so that forced cooling is usually performed. A method for forcibly cooling a battery cell by heat of vaporization of the refrigerant has been proposed. In this device, condensation is prevented by forcibly blowing air into the battery block to reduce the temperature difference in the device (Patent Document 1).

JP 2010-40420 A

  When the operation of the work machine or the like is stopped, the power storage device is cooled by outside air. Condensation occurs when cooled below the dew point. When condensation occurs on the inner surface of the housing of the power storage device, water droplets attached to the inner surface of the housing may fall. When the dropped water droplet contacts an electrode or the like in the housing, the positive and negative electrodes may be short-circuited.

  An object of the present invention is to provide a power storage device in which short-circuiting of electrodes hardly occurs even when condensation occurs. Another object of the present invention is to provide a work machine equipped with this power storage device.

According to one aspect of the invention,
The bottom plate,
A power storage laminate that is mounted on the bottom plate and in which a plurality of power storage cells are connected in series,
Provided is a power storage device that is disposed above the power storage stack, is fixed to the bottom plate, and has a top plate that has an inner surface that is inclined with respect to the bottom plate above the power storage stack.

  According to another aspect of the present invention, a work machine equipped with the above-described power storage device is provided.

According to yet another aspect of the invention,
A traveling device for traveling the vehicle body;
A power storage device mounted on the vehicle body,
The power storage device
A power storage laminate in which a plurality of power storage cells are connected in series;
A housing that houses the electricity storage laminate,
When the traveling device is installed on a horizontal plane, a working machine in which the power storage device is mounted on the vehicle body in a posture in which a portion of the housing located above the power storage stack is not parallel to the horizontal plane. Provided.

  Since the inner surface of the top plate is inclined, water droplets generated by condensation on the inner surface move to the lower side along the inner surface. Water drops are less likely to fall vertically downward from the inner surface. Thereby, the short circuit between the electrodes resulting from dew condensation can be suppressed.

1A and 1B are cross-sectional views of the power storage device according to the first embodiment. 1C and 1D are cross-sectional views of the power storage device according to the first embodiment. 2A and 2B are cross-sectional views of the power storage device according to the second embodiment. FIG. 2C is a cross-sectional view of the power storage device according to the second embodiment. FIG. 3A is a cross-sectional view of the power storage device according to the third embodiment. 3B and 3C are cross-sectional views of the power storage device according to the third embodiment. 4A to 4C are cross-sectional views of a power storage device according to a modification of the third embodiment. 5A to 5E are perspective views of a power storage device according to another modification of the third embodiment. FIG. 6 is a partially broken side view of the work machine according to the fourth embodiment. FIG. 7 is a cross-sectional view of a power storage device used in the work machine according to the fifth embodiment. FIG. 8 is a partially broken side view of the working machine according to the fifth embodiment.

[Example 1]
FIG. 1A is a cross-sectional view of a power storage device according to the first embodiment. A plurality of plate-shaped storage cells 20 and heat transfer plates 25 are alternately stacked in the thickness direction. An xyz orthogonal coordinate system in which the thickness direction is the z-axis direction is defined. Storage cells 20 are arranged at both ends in the thickness direction. An end plate 31 is in close contact with each of the outermost storage cells 20. A plurality of tie rods 33 penetrate from one end plate 31 to the other end plate 31 to apply a compressive force in the z direction to the storage cell 20 and the heat transfer plate 25.

  Each of the electricity storage cells 20 is formed by sandwiching a flat electricity storage element such as a secondary battery or an electric double layer capacitor between a pair of laminate films. The electricity storage cell 20 includes a region (fused portion) where the laminate films are fused to each other on the outer peripheral portion thereof. In addition, the storage cell 20 includes a pair of electrode terminals 21. The pair of electrode terminals 21 are led out in the positive direction and negative direction of x from the outer peripheral portions of the storage cell 20 facing each other. One of the electrode terminals 21 is a positive electrode, and the other is a negative electrode. A plurality of power storage cells 20 are connected in series by connecting the electrode terminals 21 of the power storage cells 20 adjacent to each other.

  For example, aluminum is used for the heat transfer plate 25, and stainless steel is used for the tie rod 33 and the end plate 31, for example. A structure including the storage cell 20, the heat transfer plate 25, the end plate 31, and the tie rod 33 is referred to as a storage stack 30. The electricity storage laminate 30 is fixed to the bottom plate 14. For example, the power storage laminate 30 is fixed to the bottom plate 14 by fastening the end plate 31 to the bottom plate with bolts. At this time, the power storage cell 20 and the heat transfer plate 25 are supported at positions floating from the bottom plate 14. That is, a cavity is defined between the storage cell 20 and the heat transfer plate 25 and the bottom plate 14.

  A top plate 13 is attached on the electricity storage laminate 30. For example, the top plate 13 is fixed to the power storage laminate 30 by fastening the top plate 13 to the end plate 31 with bolts. The inner surface of the top plate 13 is configured by a curved surface that is convex upward (positive direction of the x axis) with respect to the bottom plate 14. An intersection line between the inner surface of the top plate 13 and a virtual plane parallel to the zx plane becomes a convex curve upward.

  FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A. A cross-sectional view taken along one-dot chain line 1A-1A in FIG. 1B corresponds to FIG. 1A. The planar shape of the storage cell 20 and the heat transfer plate 25 is substantially rectangular. Electrode terminals 21 are led out upward and downward from opposite sides (the upper side and the lower side in FIG. 1B) of the storage cell 20. A space is defined between the electrode terminal 21 led out downward (in the direction of the bottom plate 14) and the bottom plate 14. The heat transfer plate 25 projects to the outside of the edge of the storage cell 20 in plan view. The tie rod 33 is disposed at a position that does not overlap the heat transfer plate 25 and the electrode terminal 21 in the xy plane.

  A pair of wall plates 11 and 12 are arranged on both sides of the electricity storage laminate 30 with respect to the y direction, that is, so as to sandwich the electricity storage laminate 30 in the y direction. The wall plates 11 and 12 are in contact with the end face of the heat transfer plate 25. Thereby, the heat transfer plate 25 is thermally coupled to the wall plates 11 and 12. Each of the wall plates 11 and 12 is fixed to the bottom plate 14 with bolts, and the top plate 13 is fixed to the wall plates 11 and 12 with bolts. An intersection line between the inner surface of the top plate 13 and a virtual plane parallel to the xy plane is also a convex curve upward. For example, the inner surface of the top plate 13 is a spherical surface, an elliptical surface, an elliptical surface, a rotating surface, or the like. A channel 17 for flowing a cooling medium is formed inside the wall plates 11 and 12.

  FIG. 1C is a partial cross-sectional view taken along one-dot chain line 1C-1C in FIG. 1B. The electrode terminal 21 led out from the storage cell 20 passes through the outside of the edge of the heat transfer plate 25 and is connected to the electrode terminal 21 of the adjacent storage cell 20.

  FIG. 1D is a cross-sectional view taken along one-dot chain line 1D-1D in FIG. 1B. Cross-sectional views taken along one-dot chain lines 1A-1A, 1B-1B, and 1C-1C in FIG. 1D correspond to FIGS. 1A, 1B, and 1C, respectively. The heat transfer plate 25 is in contact with the wall plates 11 and 12 at its end face. Each of the wall plates 11 and 12 is fixed to the end plate 31 with bolts.

  When the work machine on which the power storage device is mounted is stopped, the power storage device is cooled by outside air. When the temperatures of the end plate 31, the top plate 13, the bottom plate 14, and the wall plates 11 and 12 become below the dew point, their surfaces are condensed. The inner surface of the top plate 13 is a curved surface that protrudes upward. When the bottom plate 14 is mounted on the work machine in a substantially horizontal posture, the inner surface of the top plate 13 is inclined with respect to the horizontal plane except for the highest point. For this reason, the water droplet adhering to the inner surface of the top plate 13 moves to the lower side along its inclination without falling vertically downward.

  The water droplets moved downward reach the end plate 31 and the wall plates 11 and 12. Thereafter, it moves downward along the inner surfaces of the end plate 31 and the wall plates 11 and 12, and finally accumulates on the bottom plate 14. Since a space is defined between the bottom plate 14 and the electrode terminal 21, water accumulated on the bottom plate 14 does not contact the electrode terminal 21.

  When water droplets flow along the inner surfaces of the wall plates 11 and 12, they may come into contact with the heat transfer plate 25. However, the heat transfer plate 25 is insulated from the electrode terminal 21 and is normally grounded. For this reason, even if a water droplet contacts the heat transfer plate 25, an electrical short circuit does not occur. Further, when water droplets flow along the inner surface of the end plate 31, the water droplets may come into contact with the laminate film of the storage cell 20. Since the surface of this laminate film is insulative, even if a water droplet comes into contact with the surface, an electrical short circuit does not occur.

  Thus, in Example 1, the water droplet which generate | occur | produced when the inner surface of the top plate 13 dew condensation can prevent falling vertically downward. Thereby, the short circuit between electrodes can be prevented.

[Example 2]
FIG. 2A is a plan sectional view of the power storage device according to the second embodiment. As in the case of FIGS. 1A to 1D, an xyz orthogonal coordinate system is defined.

  A plurality of (at least four) storage cells 20 each having a flat plate shape are stacked in the thickness direction (z direction). Each of the electricity storage cells 20 has a structure substantially similar to that of the electricity storage cell 20 (FIGS. 1A to 1D) of the first embodiment. However, a pair of electrode terminals (not appearing in the cross section of FIG. 2A) of each of the storage cells 20 used in Example 2 are drawn out in the same direction from the same side of the laminate film.

  The heat transport plate 26 is folded in a zigzag shape (serpentine shape). In the cross section perpendicular to the x axis, the x axis is defined so that the heat transport plate 26 has a zigzag shape. The heat transport plate 26 includes a flat plate portion 26A perpendicular to the z direction and a connecting portion 26B that connects the flat plate portions 26A. The storage cell 20 is arranged between the flat plate portions 26A adjacent to each other. A flow path 27 is formed in the heat transport plate 26. The flow path 27 reflects between the folded shape of the heat transport plate 26 and passes between the storage cells 20 while meandering. The heat transport plate 26 including the flow channel 27 is formed by folding a flat plate heat transport plate that is extruded so as to include the flow channel therein.

  A cooling medium introduction pipe 28 and a cooling medium discharge pipe 29 are connected to both ends of the flow path 27, respectively. The cooling medium introduction pipe 28 and the cooling medium discharge pipe 29 are brazed to the heat transport plate 26, for example.

  A cooling medium such as cooling water, oil, chlorofluorocarbon, ammonia, hydrocarbons, air, or the like is introduced into the cooling medium introduction pipe 28 from the cooling medium supply unit 35. The cooling medium introduced into the cooling medium introduction pipe 28 is transported to the cooling medium discharge pipe 29 via the flow path 27. The cooling medium transported to the cooling medium discharge pipe 29 is collected by the cooling medium supply device 35. The cooling medium supply device 35 is composed of, for example, a pump and a radiator.

  End plates 37 and 38 are in contact with the outer surfaces of the two outermost flat plate portions 26A. Wall plates 39 are arranged on both sides of the storage cell 20 and the heat transport plate 26 with respect to the y-axis direction. The wall plate 39 is continuous with one end plate 38. For example, the end plate 38 and the pair of wall plates 39 are formed by bending a single plate.

  The end plate 37 is fixed to the wall plate 39 with a fastener 40 composed of a bolt and a nut. The fastener 40 applies a compressive force in the z direction to the storage cell 20 and the heat transport plate 26. That is, the end plates 37 and 38, the wall plate 39, and the fastener 40 serve as a pressurizing mechanism that applies a compressive force to the storage cell 20 and the heat transport plate 26.

  2B is a cross-sectional view taken along one-dot chain line 2B-2B in FIG. 2A. A cross-sectional view taken along one-dot chain line 2A-2A in FIG. 2B corresponds to FIG. 2A. The storage cells 20 and the flat plate portions 26A (FIG. 2A) of the heat transport plate 26 are alternately stacked. A plurality of flow paths 27 are formed inside the heat transport plate 26. In FIG. 2B, the cooling medium is transported in a direction perpendicular to the paper surface. The flow paths 27 are separated by a partition wall. Since the partition wall is formed between the flow paths 27, when a compressive force in the thickness direction is applied to the flat plate portion 26A of the heat transport plate 26, the flat plate portion 26A is not crushed and the shape is maintained. Is done.

  End plates 37 and 38 and a heat transport plate 26 are supported on the bottom plate 14. A cavity is formed between the top plate 13 and the heat transport plate 26. A plurality of storage cells 20 are connected in series by electrode terminals 21. The electrode terminal 21 passes through a cavity between the flat plate portion 26 </ b> A of the heat transport plate 26 and the top plate 13.

  2C is a cross-sectional view taken along one-dot chain line 2C-2C in FIGS. 2A and 2B. 2C corresponds to FIG. 2A, and the cross-sectional view taken along alternate long and short dash line 2B-2B in FIG. 2C corresponds to FIG. 2B.

  A wall plate 39 is fixed to the bottom plate 14 by a fastener 41 made of bolts and nuts. The top plate 13 is fixed to the side plate 39 by fasteners 42 made of bolts and nuts. A flow path 27 is formed inside the heat transport plate 26. The electrode terminal 21 passes through the cavity between the heat transport plate 26 and the top plate 13.

  The inner surface of the top plate 13 is a curved surface that is convex upward with the bottom plate 14 as a reference. The inner surface of the top plate 13 is, for example, a cylindrical surface, an elliptical cylindrical surface, a hyperbolic cylindrical surface, a parabolic cylindrical surface, or the like. Therefore, in the cross section shown in FIG. 2B, the inner surface of the top plate 13 is a straight line. As in the first embodiment, the inner surface of the top plate 13 may be a spherical surface, an elliptical surface, an elliptical surface, a rotating surface, or the like.

  Also in the second embodiment, when the bottom plate 14 is mounted on the work machine in a substantially horizontal posture, water droplets adhering to the inner surface of the top plate 13 do not fall vertically downward along the surface. Move down. In Example 2, it moves toward the wall plate 39. The water droplets reaching the wall plate 39 move to the bottom plate 14 along the inner surface of the wall plate 39. For this reason, it is possible to prevent water droplets from coming into contact with the electrode terminal 21.

[Example 3]
FIG. 3A is a plan sectional view of the power storage device according to the third embodiment. A plurality of, for example, six power storage stacks 30 are fixed on the bottom plate 14. Each of the power storage laminates 30 has the same structure as that obtained by removing the bottom plate 14 and the top plate 13 from the power storage device (FIGS. 1A to 1D) according to the first embodiment.

  The plurality of power storage laminates 30 are connected in series by a bus bar 51. The six power storage laminates 30 are surrounded by the side plate 19. The side plate 19 is fixed to the bottom plate 14 by a fastener 43 composed of a bolt and a nut.

  3B is a cross-sectional view taken along one-dot chain line 3B-3B in FIG. 3A. A cross-sectional view taken along one-dot chain line 3A-3A in FIG. 3B corresponds to FIG. 3A. The power storage laminate 30 is fixed to the bottom plate 14 with a fastener such as a bolt. For example, an end plate (corresponding to the end plate 31 in FIG. 1A) or a wall plate (corresponding to the wall plates 11 and 12 in FIG. 1B) of the power storage laminate 30 is fixed to the bottom plate 14 with bolts.

  A top plate 18 is continuous with the upper end of the side plate 19. The top plate 18 covers a space in which the power storage laminate 30 is accommodated. The inner surface of the top plate 18 is a curved surface convex upward with respect to the bottom plate 14.

  A drain 53 is attached to the bottom plate 14. The drain 53 is connected to the tank 55 via the drain valve 54.

  3C is a cross-sectional view taken along one-dot chain line 3C-3C in FIG. 3A. A cross-sectional view taken along one-dot chain line 3A-3A in FIG. 3C corresponds to FIG. 3A.

  In the cross section shown in FIG. 3B, the inner surface of the top plate 18 has a convex curve upward, but in the cross section shown in FIG. 3C, the inner surface of the top plate 18 becomes a straight line. . That is, the inner surface of the top plate 18 is a cylindrical surface such as a cylindrical surface, an elliptical cylindrical surface, a rectangular parallelepiped cylindrical surface, or a hyperbolic cylindrical surface. As in the first embodiment, the inner surface of the top plate 18 may be a spherical surface, an elliptical surface, an elliptical surface, a rotating surface, or the like.

  Also in the third embodiment, the water droplets attached to the inner surface of the top plate 18 move toward the side plate 19 along the inclination. Then, it moves downward along the inner surface of the side plate 19 and reaches the bottom plate 14. The water accumulated on the bottom plate 14 is collected in the tank 55 via the drain 53.

  Since the inner surface of the top plate 18 is inclined, it is possible to prevent water droplets from falling and coming into contact with the electrode terminals 21 and the bus bars 51 of the power storage laminate 30.

  4A and 4B are cross-sectional views of a power storage device according to a modification of the third embodiment. 4A and 4B correspond to the cross sections of FIGS. 3B and 3C, respectively. In the following description, differences from the third embodiment will be described, and description of the same configuration will be omitted.

  As shown in FIG. 4A, the inner surface of the top plate 18 is composed of a plurality of curved surfaces in FIG. 4A. Each curved surface is a column surface convex upward with respect to the bottom plate 14. In plan view, the power storage stack 30 is arranged so that the valley line portion 18 a on the inner surface of the top plate 18 does not overlap the power storage stack 30.

  As shown in FIG. 4B, the bus bar of each column surface inside the top plate 18 is inclined in one direction with respect to the bottom plate 14.

  Water droplets adhering to the inner surface of the top plate 18 gather on the side plate 19 or the valley line 18a. The water droplets collected in the valley line portion move downward along the valley line based on the inclination of the bus bar. For this reason, it is possible to prevent water droplets from coming into contact with the electrode terminals of the power storage laminate 30 and the bus bar 51.

  In the case where the surface of the bus bar 51 is covered with an insulating film, even if a water droplet contacts the bus bar 51, the risk of an electrical short circuit is low. For this reason, it is not necessary to incline the generatrix of each curved surface. In addition, in order to prevent water droplets in contact with the bus bar 51 from moving in the direction of the power storage laminate 30 on both sides, as shown in FIG. It is preferable to make the shape lower at the position.

  5A to 5E are perspective views of a side plate and a top plate of a power storage device according to another modification of the third embodiment.

  In the example shown in FIG. 5A, the inner surface of the top plate 18 includes a column surface convex upward and flat inclined surfaces disposed at both ends thereof.

  In the example shown in FIGS. 5B to 5E, the inner surface of the top plate 18 is composed of one or a plurality of inclined planes. In the example shown in FIG. 5B, the inner surface of the top plate 18 is a pyramid surface of a quadrangular pyramid. In the example shown in FIG. 5C, the inner surface of the top plate 18 has a gable roof shape. In the example shown in FIG. 5D, the inner surface of the top plate 18 has the shape of a dormitory roof. In the example shown in FIG. 5E, the inner surface of the top plate 18 has a single-flow roof shape.

  In any structure, there is no point at which the height is minimized and no valley line other than the connection portion between the top plate 18 and the side plate 19. For this reason, water droplets adhering to the inner surface of the top plate 18 move toward the side plate 19. Thereby, it can prevent that a water droplet falls from the top plate 18 and produces an electrical short circuit.

  In Examples 1 to 3 and the modifications thereof, an electric double layer capacitor is used as the storage cell 20, but a lithium ion capacitor, a lithium ion secondary battery, or the like may be used.

[Example 4]
FIG. 6 shows a partially broken side view of a hybrid excavator as an example of a work machine according to the fourth embodiment. An upper swing body 70 is mounted on the traveling device 71 via a swing bearing 73. The upper swing body 70 includes a swing frame 70A, a cover 70B, and a cabin 70C. The swivel frame 70A functions as a support structure for the cabin 70C and various components. The cover 70B covers various components mounted on the turning frame 70A, such as the power storage device 80. A seat on which an operator is seated is accommodated in the cabin 70C.

  The turning electric motor turns the turning frame 70 </ b> A, which is the driving target, clockwise or counterclockwise with respect to the traveling device 71. A boom 82 is attached to the upper swing body 70. The boom 82 swings up and down with respect to the upper swing body 70 by a hydraulically driven boom cylinder 107. An arm 85 is attached to the tip of the boom 82. The arm 85 swings in the front-rear direction with respect to the boom 82 by an arm cylinder 108 that is hydraulically driven. A bucket 86 is attached to the tip of the arm 85. The bucket 86 swings in the vertical direction with respect to the arm 85 by a hydraulically driven bucket cylinder 109.

  A power storage device 80 is mounted on the turning frame 70 </ b> A via a power storage device mount 90 and a damper (vibration isolation device) 91. The power storage device 80 is disposed, for example, behind the cabin 70C. Cover 70 </ b> B covers power storage module 80. For the power storage module 80, the power storage device according to the first to third embodiments or a modification thereof is used. The electric motor for turning is driven by the electric power supplied from the power storage device 80. The electric motor for turning generates regenerative electric power by converting kinetic energy into electric energy. The power storage device 80 is charged by the generated regenerative power.

  Since the power storage device 80 according to any of the first to third embodiments or the variation thereof is used as the power storage device 80, occurrence of a failure due to condensation can be suppressed. In FIG. 6, the hybrid excavator is shown as an example of the work machine. However, the power storage device according to the first to third embodiments and the modified example can be used for other hybrid work machines, electric work machines such as electric excavators, and the like. It can also be installed.

[Example 5]
FIG. 7 shows a cross-sectional view of a power storage device used in the work machine according to the fifth embodiment. The inner surface of the top plate 18 of the power storage device shown in FIG. 7 is configured by a plane substantially parallel to the bottom plate 14. Other configurations are the same as those of the power storage device according to the third embodiment illustrated in FIGS. 3A to 3C. The bottom plate 14, the side plate 19, and the top plate 18 constitute a housing that houses the power storage laminate.

  FIG. 8 shows a partially broken side view of a hybrid excavator as an example of a work machine according to the fifth embodiment. In the fifth embodiment, the power storage device 80 is attached to the turning frame 70 </ b> A via a power storage device mount 90, a damper (vibration isolation device) 91, and an inclined member 92. The power storage device 80 is the same as that shown in FIG. When the work machine is installed on the horizontal plane, the bottom plate 14 (FIG. 7) of the power storage device 80 is inclined with respect to the horizontal plane by the inclined member 92. For this reason, the part located in the upper surface of the electrical storage laminated body among the surfaces inside the top plate 18, ie, a housing | casing, also inclines with respect to a horizontal surface.

  Water droplets adhering to the inner surface of the top plate 18 move downward along the inner surface of the top plate. Then, it moves to the bottom plate 14 along the inner surface of the side plate 19. The drain 53 (FIG. 7) is provided at the lowest position of the bottom plate 14. For this reason, the water droplets that have moved to the bottom plate 14 are collected in the tank 55 through the drain 53.

  It is preferable to incline the inner surface of the top plate 18 so as to become lower as the distance from the turning center of the turning frame 70A increases. By inclining in this direction, water droplets adhering to the inner surface of the top plate 18 can be moved toward the side plate 19 more efficiently by gravity and centrifugal force during turning.

  Also in the fifth embodiment, it is possible to suppress a failure of the power storage device due to condensation.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

DESCRIPTION OF SYMBOLS 11, 12 Wall plate 13 Top plate 14 Bottom plate 17 Flow path 18 Top plate 19 Side plate 20 Storage cell 21 Electrode terminal 25 Heat transfer plate 26 Heat transport plate 26A Flat part 26B Connection part 27 Channel 28 Cooling medium introduction pipe 29 Cooling medium Discharge pipe 30 Power storage laminate 31 End plate 33 Tie rod 35 Cooling medium supply device 37, 38 End plate 39 Wall plates 40, 41, 42, 43 Fastener 51 Bus bar 70 Upper swing body 71 Travel device 73 Swing bearing 80 Power storage device 82 Boom 85 Arm 86 Bucket 90 Power storage device mount 91 Damper (anti-vibration device)
92 Inclined member 107 Boom cylinder 108 Arm cylinder 109 Bucket cylinder

Claims (6)

The bottom plate,
A power storage laminate that is mounted on the bottom plate and in which a plurality of power storage cells are connected in series,
A power storage device including a top plate disposed above the power storage stack, fixed to the bottom plate, and having an inner surface inclined with respect to the bottom plate above the power storage stack.   The power storage device according to claim 1, wherein an inner surface of the top plate is configured with a curved surface that protrudes upward with respect to the bottom plate.   The power storage device according to claim 1, wherein an inner surface of the top plate is configured by one or a plurality of planes inclined with respect to the bottom plate. In addition to the electricity storage laminate, at least one other electricity storage laminate is attached to the bottom plate,
Each of the plurality of power storage laminates is
A laminated plate-shaped storage cell;
A pressurizing mechanism for applying a compressive force in the stacking direction to the stacked structure of the storage cell,
The top plate has a size that covers the plurality of power storage laminates, and the inner surface of the top plate is composed of a plurality of curved surfaces that are convex upward with respect to the bottom plate. 4. The power storage device according to claim 1, wherein the power storage stack is arranged so that a portion that becomes a valley line of the top plate and the power storage stack do not overlap each other when viewed. The bottom plate,
A power storage laminate that is mounted on the bottom plate and in which a plurality of power storage cells are connected in series,
A work machine equipped with a power storage device that is disposed above the power storage stack, is fixed to the bottom plate, and has a top plate that has an inner surface that is inclined with respect to the bottom plate above the power storage stack. . A traveling device for traveling the vehicle body;
A power storage device mounted on the vehicle body,
The power storage device
A power storage laminate in which a plurality of power storage cells are connected in series;
A housing that houses the electricity storage laminate,
A work machine in which the power storage device is mounted on the vehicle body in a posture in which a portion of the housing located above the power storage laminate is not parallel to the horizontal surface when the traveling device is installed on a horizontal surface.

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