JP2014139881A - Power storage module and work machine equipped with power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a desired power storage module having sufficient reliability even if attached to the strongly vibrating portion.SOLUTION: A power storage laminate is constituted by overlapping a plurality of plate-shaped power storage cells and a plurality of heat exchanger plates. A pair of end plates is arranged at both end of the power storage laminate in the overlapping direction, respectively. A pressurizing mechanism applies a compressive force in the overlapping direction to the power storage laminate through the end plates. The upper end of the heat exchanger plate protrudes from the upper end of the end plate with respect to the height direction orthogonal to the overlapping direction.

Description

  The present invention relates to a power storage module including a plurality of stacked power storage cells and a plurality of heat transfer plates, and a work machine equipped with the power storage module.

  Development of work machines using rechargeable secondary batteries, capacitors and other storage cells is underway. As a power storage cell employed in a work machine, a flat (plate-shaped) power storage cell in which a power storage element is wrapped with a film has been proposed. A positive electrode terminal and a negative electrode terminal are led out from the outer periphery of the storage cell.

  A power storage module can be obtained by electrically connecting a plurality of stacked power storage cells. Various configurations have been proposed for dissipating heat generated in stacked storage cells to the outside (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 8-111244

  Work machines often travel on gravel roads with poor road surfaces and often collide with surrounding deposits and structures during work. For this reason, the power storage device mounted on the work machine is required to have high rigidity that can withstand vibration and impact. Further, in the case of a work machine that performs excavation, vibration and impact due to impact during excavation are large, and thus, the power storage device is required to have particularly high rigidity. In a power storage device having a conventional structure, it has been difficult to obtain sufficient rigidity. In addition, it has been difficult to achieve sufficient cooling efficiency.

  Particularly, in an excavator having a lower traveling body, an upper revolving body mounted thereon, and a boom, etc., the upper revolving body may be affected by an impact during operation or traveling because of the backlash of a revolving bearing to which the upper revolving body is attached. Vibrates violently up and down. There is a demand for a power storage module that has sufficient reliability even when attached to an upper rotating body.

According to one aspect of the invention,
A power storage laminate configured by stacking a plurality of plate-shaped power storage cells and a plurality of heat transfer plates; and
A pair of end plates respectively disposed at both ends in the stacking direction of the electricity storage laminate;
A pressurizing mechanism for applying a compressive force in the stacking direction to the power storage laminate through the end plate;
An energy storage module is provided in which an upper end of the heat transfer plate protrudes from an upper end of the end plate with respect to a height direction orthogonal to the stacking direction.

  According to another aspect of the invention. A work machine equipped with the above-described power storage module is provided.

Since the upper end of the heat transfer plate protrudes from the upper end of the end plate, the heat transfer plate can be sandwiched in the height direction without being blocked by the end plate. By sandwiching the heat transfer plate in the height direction, the heat transfer plate can be mechanically fixed. Furthermore, the heat transfer coefficient between the member that sandwiches the heat transfer plate and the heat transfer plate is increased, and the storage cell can be efficiently cooled.

1A and 1B are perspective views of an upper plate and a lower housing of a power storage device according to Embodiment 1, respectively. FIG. 2 is a plan view of the lower housing and the power storage module housed in the lower housing. 3 is a cross-sectional view taken along one-dot chain line 3-3 in FIG. 4A is a cross-sectional view of a fixed portion between the end plate and the upper plate of the power storage device according to the second embodiment, and FIG. It is sectional drawing. FIG. 5 is a cross-sectional view of the power storage device according to the third embodiment. FIG. 6 is a cross-sectional view of the power storage device according to the fourth embodiment. FIG. 7 is a cross-sectional view of the power storage device according to the fifth embodiment. FIG. 8 is a cross-sectional view of the power storage device according to the sixth embodiment. FIG. 9 is a partial cross-sectional view of the power storage device according to the seventh embodiment. FIG. 10 is a side view of the work machine according to the eighth embodiment. FIG. 11 is a block diagram of a work machine according to an eighth embodiment.

[Example 1]
1A and 1B are perspective views of an upper lid and a lower housing of a power storage device according to Embodiment 1, respectively.

  As shown in FIG. 1B, the lower housing 20 includes a rectangular bottom plate 21 and four side walls 22 rising upward from the outer peripheral portion thereof. The upper part of the lower housing 20 is open. The opening of the lower housing 20 is closed by the upper lid 30 (FIG. 1A). A flange 23 is provided at the upper end of the side wall 22. A plurality of through holes 24 for passing bolts are formed in the flange 23. Each of the lower housing 20 and the upper lid 30 is formed by, for example, a casting method.

  Two power storage modules 40 are mounted on the bottom plate 21. Each power storage module 40 has a stacked structure in which a plurality of power storage cells are stacked, as will be described later. The two power storage modules 40 are arranged side by side so that the stacking directions of the storage cells are parallel to each other. An opening 25 is formed in the center of one side wall 22 that intersects the stacking direction of the power storage modules 40.

  A connector box 26 is disposed outside the side wall 22 where the opening 25 is formed so as to close the opening 25. The upper surface of the connector box 26 is open. This open portion is blocked by the connector. The power storage module 40 is connected to an external electric circuit via a connector.

  As shown in FIG. 1A, the upper lid 30 includes an upper plate 31 and a side wall 32 extending downward from the outer periphery thereof. The outer periphery of the upper plate 31 is aligned with the outer periphery of the bottom plate 21. The height of the side wall 32 of the upper lid 30 is lower than the height of the side wall 22 of the lower housing 20. For example, the height of the side wall 32 is about 25% of the height of the side wall 22. A flange 33 is provided at the lower end of the side wall 32. A plurality of through holes 34 are formed in the flange 33. The through hole 34 is disposed at a position corresponding to the through hole 24 of the lower housing 20. A flow path (not shown) for the cooling medium is formed in the upper plate 31 and the bottom plate 21.

  FIG. 2 is a plan view of the lower housing 20 and the power storage module 40 accommodated in the lower housing 20. Two power storage modules 40 are arranged on the bottom plate 21. Hereinafter, the structure of the power storage module 40 will be described.

  A plurality of power storage cells 41 and heat transfer plates 42 are stacked. As the storage cell 41, for example, a flat electric double layer capacitor, a lithium ion battery, a lithium ion capacitor, or the like is used. For example, an aluminum plate is used as the heat transfer plate 42. Although FIG. 2 shows an example in which the storage cells 41 and the heat transfer plates 42 are alternately stacked one by one, it is not always necessary to alternately stack one by one. For example, two power storage cells 41 and one heat transfer plate 42 may be stacked as a set.

  End plates 50 are arranged at both ends of a power storage laminate 43 composed of a plurality of stacked power storage cells 41 and a plurality of heat transfer plates 42. The end plate 50 is made of, for example, stainless steel. The longitudinal elastic modulus of the end plate 50 is higher than the longitudinal elastic modulus of the heat transfer plate 42. A tie rod (pressurizing mechanism) 51 reaches from one end plate 50 to the other end plate 50, and applies a compressive force in the stacking direction to the power storage stack 43. The lower end of the end plate 50 is bent into an L shape. A portion 50A at the tip from the bent portion is fixed to the bottom plate 21 of the lower housing 20 with a bolt or the like.

  Each of the storage cells 41 has a pair of electrode terminals 44. A plurality of power storage cells 41 are connected in series by connecting the electrode terminals 44 to each other. The electrode terminals 44 are connected to each other outside the edge of the heat transfer plate 42 and are insulated from the heat transfer plate 42. Of the electrode terminals 44 of the storage cells 41 at both ends, the electrode terminal 44 that is not connected to the adjacent storage cell 41 is connected to the relay plate 45. The relay plate 45 is fixed to the outer surface of the end plate 50 through an insulator 46.

  The relay plates 45 on the opposite sides (left side in FIG. 2) of the two power storage modules 40 are connected to each other by a bus bar 53 and a fuse 54. The relay plate 45 on the other side (right side in FIG. 2) of the two power storage modules 40 is connected to the relay circuit 56 via the bus bar 55. The relay circuit 56 is connected to a connector 57 that closes the opening of the connector box 26.

  You may accommodate the electrical equipment required for operation | movement of the electrical storage module 40 in the empty space in the lower housing | casing 20. FIG. This electrical component is electrically connected to the power storage module 40.

  FIG. 3 is a cross-sectional view taken along one-dot chain line 3-3 in FIG. End plates 50 are arranged at both ends of a power storage laminate 43 composed of a plurality of power storage cells 41 and a plurality of heat transfer plates 42. The tie rod 51 reaches from one end plate 50 to the other end plate 50 and applies a compressive force in the stacking direction to the power storage stack 43. The lower end and the upper end of each end plate 50 are bent in an L shape. A front end portion 50 </ b> A bent at the lower end of the end plate 50 is fixed to the bottom plate 21 with a bolt 60. The bolt 60 is inserted into a screw hole formed in the bottom plate 21.

  The opening of the lower housing 20 is closed with the upper lid 30. The flange 23 of the lower housing 20 and the flange 33 of the upper lid 30 are fastened by a fastener 62 made of bolts and nuts. The lower end and the upper end of the heat transfer plate 42 are in contact with the bottom plate 21 and the upper plate 31, respectively. With respect to the height direction, the upper end of the heat transfer plate 42 protrudes upward from the upper end of the end plate 50. By fastening the upper lid 30 to the lower housing 20 with the fastener 62, a load in the height direction is applied to the power storage laminate 43. Due to this load, the heat transfer plate 42 is firmly and non-slidably fixed by frictional force in the space defined by the lower casing 20 and the upper lid 30. Since the upper end of the heat transfer plate 42 protrudes from the upper end of the end plate 50, a load can be applied to the heat transfer plate 42 without being blocked by the end plate 50.

  A gap (tightening margin) 63 is left between the upper end of the side wall 22 of the lower housing 20 and the lower end of the side wall 32 of the upper lid 30. By leaving the tightening margin 63, a load in the height direction can be stably applied to the heat transfer plate.

  A tip portion 50B bent at the upper end of the end plate 50 is fixed to the upper plate 31 by bolts 61. The bolt 61 passes through the through hole 64 formed in the upper plate 31 and is inserted into the screw hole formed in the tip portion 50B. Since the end plate 50 is fixed to the bottom plate 21 and the upper plate 31 at the lower end and the upper end, respectively, vibrations in the direction in which the end plate 50, the heat transfer plate 42, and the storage cell 41 fall with respect to the bottom plate 21 are suppressed. can do. Thereby, the vibration resistance and impact resistance of the power storage module 40 can be improved.

  When a compressive force in the stacking direction is applied to the power storage stack 43, the power storage cell 41 is compressed and its thickness is reduced. The thickness of the storage cell 41 after compression varies for manufacturing reasons. Since the length of the electricity storage laminate 43 after compression varies, the position where the end plate 50 should be fixed varies in the plane of the upper plate 31. An adjustment margin for adjusting the position at which the end plate 50 is fixed to the upper plate 31 is secured. Specifically, the through hole 64 formed in the upper plate 31 has a planar shape that is long in the stacking direction of the power storage stack 43. Thereby, the end plate 50 can be fixed to the upper plate 31 by absorbing variations in the length of the power storage laminate 43.

  A channel 58 and a channel 59 for flowing a cooling medium are formed in the bottom plate 21 and the upper plate 31, respectively. The storage cell 41 can be cooled via the heat transfer plate 42 by flowing a cooling medium such as cooling water through the flow paths 58 and 59. The load in the height direction applied to the heat transfer plate 42 mechanically fixes the heat transfer plate 42 between the bottom plate 21 and the upper plate 31 by frictional force, and between the bottom plate 21 and the heat transfer plate 42. And, the heat transfer coefficient between the upper plate 31 and the heat transfer plate 42 can be increased.

[Example 2]
With reference to FIG. 4A, the electrical storage apparatus by Example 2 is demonstrated. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

  FIG. 4A shows a cross-sectional view of a fixed portion between the end plate 50 and the upper plate 31. A front end portion 50 </ b> B of the end plate 50 is fixed to the upper plate 31 by bolts 61. The head of the bolt 61 is accommodated in the recess 65 formed in the upper plate 31. A through hole 64 is disposed in the bottom surface of the recess 65. The head of the bolt 61 does not protrude from the surface of the upper plate 31. The lid 72 closes the opening of the recess 65. The lid 72 is fixed to the upper plate 31 by bolts 73. A gasket 71 is disposed between the lid 72 and the upper plate 31. The gasket 71, the lid 72, and the bolt 73 function as a waterproof structure 70 that prevents water from entering.

  FIG. 4B is a cross-sectional view of a fixed portion between the end plate 50 and the upper plate 31 of the power storage device according to the modification of the second embodiment. A convex portion 75 is formed on the outer surface of the upper plate 31. A through hole 64 is disposed inside the top surface of the convex portion 75. The seating surface of the head of the bolt 61 contacts the top surface of the convex portion 75. The head of the bolt 61 protrudes beyond the top surface of the convex portion 75. A protective wall 61A extends downward from the outer periphery of the head of the bolt 61. The convex portion 75 and the protective wall 61A function as a drip-proof or rain-proof waterproof structure 70.

[Example 3]
FIG. 5 is a cross-sectional view of the power storage device according to the third embodiment. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

  In Example 1, the heat transfer plate 42 was in direct contact with the bottom plate 21 and the top plate 31 as shown in FIG. In Example 3, as shown in FIG. 5, a heat transfer rubber sheet 80 is disposed between the heat transfer plate 42 and the bottom plate 21, and the heat transfer rubber sheet is interposed between the heat transfer plate 42 and the upper plate 31. 81 is arranged. When a load is applied to the upper plate 31, the heat transfer rubber sheets 80 and 81 are elastically deformed. When the heat transfer rubber sheets 80 and 81 are elastically deformed, variations in the dimension of the heat transfer plate 42 in the height direction can be absorbed.

[Example 4]
FIG. 6 is a cross-sectional view of the vicinity of one end plate 50 of the power storage device according to the fourth embodiment. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

  In the first embodiment, as shown in FIG. 3, the upper end portion 50 </ b> B of the end plate 50 is fixed to the upper plate 31 by the bolt 61. In Example 4, as shown in FIG. 6, an elastic member 85 is arranged instead of the bolt 61 (FIG. 3). For example, a coil spring is used for the elastic member 85. A leaf spring may be used instead of the coil spring.

  The elastic member 85 is disposed between the front end portion 50 </ b> B of the end plate 50 and the upper plate 31. The restoring force of the elastic member 85 acts in a direction to widen the distance between the tip portion 50B and the upper plate 31. The elastic member 85 is fixed to the tip portion 50B of the end plate 50. The elastic member 85 may be fixed to the upper plate 31.

  The elastic member 85 suppresses vibration related to the direction in which the end plate 50 falls with respect to the bottom plate 21. Thereby, similarly to Example 1, the vibration resistance and impact resistance of the power storage module 40 can be improved.

[Example 5]
FIG. 7 is a cross-sectional view of the power storage device according to the fifth embodiment. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

  In the first embodiment, as shown in FIG. 3, the upper end portion 50 </ b> B of the end plate 50 is fixed to the upper plate 31 by the bolt 61. In the fifth embodiment, as shown in FIG. 7, instead of the bolt 61 (FIG. 3), a convex portion 86 and a concave portion 87 that are fitted to each other are provided. The convex portion 86 protrudes upward from the tip portion 50 </ b> B of the end plate 50. The recess 87 is formed on the inner surface of the upper plate 31.

  By inserting the convex portion 86 into the concave portion 87, the position of the tip portion 50 </ b> B on the upper side of the end plate 50 is constrained with respect to the in-plane direction of the upper plate 31. For this reason, the end plate 50 is unlikely to fall over the bottom plate 21. Thereby, similarly to Example 1, the vibration resistance and impact resistance of the power storage module 40 can be improved.

[Example 6]
FIG. 8 is a partial cross-sectional view of the power storage device according to the sixth embodiment. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

  In the sixth embodiment, some heat transfer plates 42 </ b> A among the plurality of heat transfer plates 42 are thicker than the other heat transfer plates 42. For example, the heat transfer plate 42 </ b> A located in the center with respect to the stacking direction of the power storage stack 43 is thicker than the other heat transfer plates 42. A relatively thick heat transfer plate 42A is formed with a through hole 48 extending from the upper end to the lower end. A portion near the upper end of the through hole 48 is thicker than the other portions. A screw hole 47 is formed in the bottom plate 21 at a position corresponding to the through hole 48.

  A bolt 49 is inserted into the through hole 48 and screwed into the screw hole 47. The thick heat transfer plate 42 </ b> A is fixed to the bottom plate 21 by the bolts 49. In the sixth embodiment, not only the end plate 50 but also a part of the heat transfer plate 42 </ b> A is fixed to the bottom plate 21, so that the impact resistance and vibration resistance can be further improved.

[Example 7]
FIG. 9 is a partial cross-sectional view of the power storage device according to the seventh embodiment. FIG. 9 shows a cross section orthogonal to the stacking direction of the electricity storage stack 43. A heat transfer plate 42 is sandwiched between the bottom plate 21 and the upper plate 31. A power storage cell 41 is stacked on the heat transfer plate 42. Electrode terminals 44 are drawn from both sides of the storage cell 41.

  Among the plurality of heat transfer plates 42, some of the heat transfer plates 42, for example, the central heat transfer plate 42 in the stacking direction has the ear portions 42 a. The ear part 42 a protrudes laterally from the lower end of the heat transfer plate 42. The ear part 42 a is fixed to the bottom plate 21 with a bolt 90. In the seventh embodiment, not only the end plate 50 but also the heat transfer plate 42 having the ear portions 42 a is fixed to the bottom plate 21, so that the impact resistance and the vibration resistance can be further improved as in the sixth embodiment. it can.

[Example 8]
FIG. 10 shows a side view of an excavator as an example of the work machine according to the eighth embodiment. An upper turning body 101 is mounted on the lower traveling body 100 so as to be turnable. A boom 103 is connected to the upper swing body 101, an arm 105 is connected to the boom 103, and a bucket 107 is connected to the arm 105. By the expansion and contraction of the boom cylinder 104, the attachment including the boom 103, the arm 105, and the bucket 107 swings up and down with respect to the upper swing body 101. As the arm cylinder 106 expands and contracts, the posture of the arm 105 changes. Due to the expansion and contraction of the bucket cylinder 108, the posture of the bucket 107 changes. The boom cylinder 104, the arm cylinder 106, and the bucket cylinder 108 are hydraulically driven.

  A swing motor 102, an engine 110, a motor generator 111, a power storage device 115, and the like are mounted on the upper swing body 101. As the power storage device 115, the power storage devices according to the first to seventh embodiments are used.

  FIG. 11 shows a block diagram of an excavator according to the eighth embodiment. In FIG. 11, the mechanical power system is represented by a double line, the high-pressure hydraulic line is represented by a thick solid line, the electric control system is represented by a thin solid line, and the pilot line is represented by a broken line.

  The drive shaft of engine 110 is connected to the input shaft of torque transmission mechanism 121. The engine 110 is an engine that generates a driving force using fuel other than electricity, for example, an internal combustion engine such as a diesel engine. The drive shaft of the motor generator 111 is connected to the other input shaft of the torque transmission mechanism 121. The motor generator 111 can perform both the electric (assist) operation and the power generation operation.

  The torque transmission mechanism 121 has two input shafts and one output shaft. A drive shaft of the main pump 122 is connected to the output shaft.

  When the load applied to the main pump 122 is large, the motor generator 111 performs an assist operation, and the driving force of the motor generator 111 is transmitted to the main pump 122 via the torque transmission mechanism 121. Thereby, the load applied to the engine 110 is reduced. On the other hand, when the load applied to the main pump 122 is small, the driving force of the engine 110 is transmitted to the motor generator 111 via the torque transmission mechanism 121, so that the motor generator 111 is operated for power generation.

  The main pump 122 supplies hydraulic pressure to the control valve 124 via the high pressure hydraulic line 123. The control valve 124 distributes hydraulic pressure to the hydraulic motors 109 </ b> A and 109 </ b> B, the boom cylinder 104, the arm cylinder 106, and the bucket cylinder 108 according to a command from the driver. The hydraulic motors 109A and 109B drive the left and right crawlers provided in the lower traveling body 100 shown in FIG.

  Motor generator 111 is connected to power storage circuit 112 via inverter 113A. The turning electric motor 102 is connected to the power storage circuit 112 via the inverter 113B. The power storage circuit 112 includes a power storage device 115. Inverters 113 </ b> A and 113 </ b> B and power storage circuit 112 are controlled by control device 135.

  Inverter 113 </ b> A controls operation of motor generator 111 based on a command from control device 135. During the period in which the motor generator 111 is assisted, necessary power is supplied from the power storage circuit 112 to the motor generator 111 through the inverter 113A. During the period in which the motor generator 111 is generating, the electric power generated by the motor generator 111 is supplied to the power storage circuit 112 through the inverter 113A.

  The swing electric motor 102 is AC driven by the inverter 113B and can perform both the power running operation and the regenerative operation. During the power running operation of the swing motor 102, electric power is supplied from the power storage circuit 112 to the swing motor 102 via the inverter 113B. The turning electric motor 102 turns the upper turning body 101 (FIG. 10) through the speed reducer 131. During the regenerative operation, the rotational motion of the upper swing body 101 is transmitted to the swing motor 102 via the speed reducer 131, so that the swing motor 102 generates regenerative power. The generated regenerative power is supplied to the power storage circuit 112 via the inverter 113B. Thereby, power storage device 115 in power storage circuit 112 is charged.

  The resolver 132 detects the position of the rotating shaft of the turning electric motor 102 in the rotation direction. The detection result is input to the control device 135. By detecting the position of the rotating shaft in the rotational direction before and after the operation of the turning electric motor 102, the turning angle and the turning direction are derived.

  A mechanical brake 133 is connected to the rotating shaft of the turning electric motor 102 and generates a mechanical braking force. The braking state and the release state of the mechanical brake 133 are controlled by the control device 135 and are switched by an electromagnetic switch.

  The pilot pump 125 generates a pilot pressure necessary for the hydraulic operation system. The generated pilot pressure is supplied to the operating device 128 via the pilot line 126. The operation device 128 includes a lever and a pedal and is operated by a driver. The operating device 128 converts the primary side hydraulic pressure supplied from the pilot line 126 into a secondary side hydraulic pressure in accordance with the operation of the driver. The secondary hydraulic pressure is transmitted to the control valve 124 via the hydraulic line 129 and also to the pressure sensor 127 via the other hydraulic line 130.

  The pressure detection result detected by the pressure sensor 127 is input to the control device 135. Thereby, the control apparatus 135 can detect the operation state of the lower traveling body 100, the boom 103, the arm 105, the bucket 107 (FIG. 10), and the turning electric motor 102.

  The upper swing body 101 (FIG. 10) receives a large impact during traveling and excavation. Since the power storage device 115 according to any of the first to seventh embodiments is used for the power storage device 115, even if the upper swing body 101 receives a large impact, the power storage module 40 (FIG. 2) is prevented from being damaged or deteriorated. can do.

  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.

20 Lower housing 21 Bottom plate 22 Side wall 23 鍔 24 Through hole 25 Opening 26 Connector box 30 Upper lid 31 Upper plate 32 Side wall 33 鍔 34 Through hole 40 Power storage module 41 Power storage cell 42 Heat transfer plate 42A Thick heat transfer plate 42a Ear portion 43 Power storage Laminated body 44 Electrode terminal 45 Relay plate 46 Insulator 47 Screw hole 48 Through hole 49 Bolt 50 End plate 50A, 50B End portion 51 Tie rod 53 Bus bar 54 Fuse 55 Bus bar 56 Relay circuit 57 Connector 58, 59 Flow path 60, 61 Bolt 62 Fastener 63 Fastening margin 64 Through hole 65 Recess 70 Waterproof structure 71 Gasket 72 Lid 73 Bolt 75 Protrusion 80, 81 Heat transfer rubber sheet 85 Elastic member 86 Protrusion 87 Recess 90 Bolt 100 Lower traveling body 101 Upper swing body 102 Swing motor 103 Boom 104 Boom cylinder 1 5 Arm 106 Arm cylinder 107 Bucket 108 Bucket cylinder 109A, 109B Hydraulic motor 110 Engine 111 Motor generator 112 Power storage circuit 113A, 113B Inverter 115 Power storage device 121 Torque transmission mechanism 122 Main pump 123 High pressure hydraulic line 124 Control valve 125 Pilot pump 126 Pilot Line 127 Pressure sensor 128 Operating device 129, 130 Hydraulic line 131 Reducer 132 Resolver 133 Mechanical brake 135 Control device

Claims (10)

A power storage laminate configured by stacking a plurality of plate-shaped power storage cells and a plurality of heat transfer plates; and
A pair of end plates respectively disposed at both ends in the stacking direction of the electricity storage laminate;
A pressurizing mechanism for applying a compressive force in the stacking direction to the power storage laminate through the end plate;
The power storage module in which an upper end of the heat transfer plate protrudes from an upper end of the end plate with respect to a height direction orthogonal to the stacking direction. further,
A bottom plate and an upper plate sandwiching the power storage laminate in the height direction;
A fastener that applies a load in the height direction to the power storage laminate by fastening the top plate to the bottom plate;
The power storage module according to claim 1, wherein the pair of end plates are fixed to the bottom plate and also fixed to the top plate. Furthermore, the lower plate including the bottom plate and the side wall rising from the outer peripheral portion of the bottom plate, the upper housing is open,
The upper plate closes the opening of the lower housing;
The power storage module according to claim 2, wherein a tightening margin is left between an upper end of the side wall and the upper plate.   The position adjustment margin for absorbing the position shift of the said upper plate and the said end plate regarding the in-plane direction of the said upper plate is ensured in the location where the said end plate is being fixed to the said upper plate. Or the electrical storage module of 3. The end plate is fixed to the upper plate by a bolt penetrating the upper plate;
The power storage module according to any one of claims 2 to 4, wherein a waterproof structure that prevents water from entering is provided at a location where the bolt penetrates the upper plate.   6. The heat transfer plate according to claim 2, wherein at least one of the plurality of heat transfer plates is thicker than the other heat transfer plates, and the thick heat transfer plate is fixed to the bottom plate. 2. The power storage module according to item 1. An electricity storage module;
A working machine having an electric motor driven by electric power stored in the power storage module,
The power storage module is:
A power storage laminate configured by stacking a plurality of plate-shaped power storage cells and a plurality of heat transfer plates; and
A pair of end plates respectively disposed at both ends in the stacking direction of the electricity storage laminate;
A pressurizing mechanism for applying a compressive force in the stacking direction to the power storage laminate through the end plate;
A work machine in which an upper end of the heat transfer plate protrudes from an upper end of the end plate with respect to a height direction orthogonal to the stacking direction. further,
A bottom plate and an upper plate sandwiching the power storage laminate in the height direction;
A first fastener that applies a load in the height direction to the electricity storage stack by fastening the top plate to the bottom plate;
The work machine according to claim 7, wherein the pair of end plates are fixed to the bottom plate and also fixed to the upper plate. Furthermore, the bottom plate is a bottom surface, includes a side wall that rises from the outer periphery of the bottom plate, and has a lower housing that is open at the top,
The upper plate closes the opening of the lower housing;
The work machine according to claim 8, wherein a tightening margin is left between an upper end of the side wall and the upper plate.   The position adjustment margin for absorbing the position shift of the said upper plate and the said end plate regarding the in-plane direction of the said upper plate is ensured in the location where the said end plate is being fixed to the said upper plate. Or the work machine of 9.

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