JP2012204356A - Power storage module and work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for reducing variety of total thickness of storage cells when certain compressive force is applied thereon.SOLUTION: A power storage module comprises: a plurality of plate-like storage cells piled up in a thickness direction; a pressure mechanism for applying compress force onto the storage cells in a piling direction; a power storage laminate, included in each of the storage cells, having a positive electrode plate and a negative electrode plate piled up alternately with a separator therebetween; and an insulation thickness adjustment sheet arranged outside of at least one of an outermost positive electrode plate and an outermost negative electrode plate. The power storage module further comprises a power storage vessel for housing the power storage laminate, the thickness adjustment sheet, and electrolytic solution. Total thickness of the thickness adjustment sheets are different between, at least, two storage cells with respect to the piling direction of the power storage laminates.

Description

  The present invention relates to a power storage module in which a plurality of power storage cells are stacked, and a work machine on which the power storage module is mounted.

  As a power storage device used in a work machine or the like, an electric double layer capacitor, a lithium ion capacitor, or the like has attracted attention. These capacitors have, for example, a structure in which electrode plates and porous separators are alternately stacked. A polarizable electrode such as activated carbon is applied to the surface of the electrode plate, and the separator is impregnated with an electrolytic solution. The laminated body of an electrode plate and a separator is accommodated in a laminate film container or a metal container. The stacked body accommodated in the container constitutes one power storage cell.

  In order to reduce the internal resistance of the electric double layer capacitor, a compressive force in the stacking direction is applied to the stacked body. Not only an electric double layer capacitor but also a storage cell such as a lithium ion capacitor, a compressive force is usually applied to fix the position of the storage cell. In a storage cell using a metal case, a separator is made of a crosslinkable plastic film such as polyethylene and an organic material having elasticity in order to make the compressive force appropriate and uniform even if the thickness of the polarizable electrode varies. The technology to configure is known.

JP 2000-311837 A

  When a laminate film container is used, when the storage cells are stacked and a compression force is applied, the storage cells are thinned by the compression force. When the thickness of the polarizable electrode varies, the total thickness of the stacked storage cells varies when a certain compressive force is applied.

  A technique for reducing variation in the total thickness of the storage cells when a certain compressive force is applied is desired.

According to one aspect of the invention,
A plurality of flat storage cells stacked in the thickness direction;
A pressure mechanism that applies a compressive force in the stacking direction to the electricity storage cell;
Each of the storage cells
An electricity storage laminate including positive and negative plates stacked alternately via separators;
An insulating thickness adjusting sheet disposed on the outer side of at least one of the positive electrode plate disposed on the outermost side and the negative electrode plate disposed on the outermost side;
The power storage laminate, the thickness adjustment sheet, and a power storage container for storing an electrolyte solution,
A power storage module is provided in which the total thickness of the thickness adjustment sheets is different between at least two power storage cells in the stacking direction of the power storage stack.

  By changing the total thickness of the thickness adjusting sheets, it is possible to compensate for the variation in the thickness of the power storage stack and to reduce the variation in the thickness of the power storage cell.

(1A) is a plan view of a power storage cell used in the power storage module according to the embodiment, (1B) is a cross-sectional view taken along one-dot chain line 1B-1B in (1A), and (1C) is a cross section of the power storage laminate. (1D) is sectional drawing in the dashed-dotted line 1D-1D of (1A). (2A) is a cross-sectional view of the power storage module according to the example, and (2B) is a cross-sectional view taken along one-dot chain line 2B-2B of (2A). (3A)-(3D) are sectional views of a power storage laminate and a thickness adjustment sheet according to a modification of the example. It is a flowchart which shows the manufacturing method of the electrical storage cell by an Example. (5A) and (5B) are sectional views of a power storage module according to a modification of the embodiment. It is a top view of the working machine carrying the electrical storage module by an Example. It is a side view of the working machine carrying the electrical storage module by an Example.

  The top view of the electrical storage cell 35 used for FIG. 1A at the electrical storage module by an Example is shown. A power storage laminate 11 is accommodated in the power storage container 10. The planar shape of the electricity storage container 10 is, for example, a rectangle with a slightly rounded vertex. The power storage laminate 11 includes a first collector electrode 21, a second collector electrode 22, a separator (electrolyte layer) 25, a first polarizable electrode 27, and a second polarizable electrode 28. The first collector electrode 21 and the second collector electrode 22 overlap each other in most regions. The first polarizable electrode 27 and the second polarizable electrode 28 are disposed in the portion where both are overlapped.

  The first polarizable electrode 27 and the second polarizable electrode 28 are disposed in substantially the same region in plan view. A region where the first polarizable electrode 27 and the second polarizable electrode 28 are disposed is referred to as an “electrode region” 29. A region outside the electrode region 29 and inside the outer periphery of the storage container 10 is referred to as a “frame region” 30.

  The first collector electrode 21 and the second collector electrode 22 have extending portions 21A and 22A extending from the electrode region 29 in opposite directions (upward and downward in FIG. 1A). The outer peripheral line of the separator 25 is located outside the region where the first collector electrode 21 and the second collector electrode 22 overlap. The extending portions 21 </ b> A and 22 </ b> A are led out to the outside of the outer periphery of the separator 25.

  The first collector electrode tab 12 and the second collector electrode tab 13 are each drawn from the inside of the electricity storage container 10 to the outside of the electricity storage container 10 so as to intersect the mutually parallel edges of the electricity storage container 10. The first collector electrode tab 12 and the second collector electrode tab 13 overlap the extended portion 21A of the first collector electrode 21 and the extended portion 22A of the second collector electrode 22, respectively. The two collector electrodes 22 are electrically connected. The first collector electrode tab 12 and the second collector electrode tab 13 act as electrodes having opposite polarities.

  A gas vent hole 14 is formed in the frame region 30 of the electricity storage container 10. The gas vent hole 14 is disposed, for example, at a position overlapping the extended portion 21A of the first collector electrode 21. The gas vent structure 15 is disposed at a position overlapping the gas vent hole 14.

  FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A. The electricity storage container 10 includes two aluminum laminate films 10A and 10B. Aluminum laminate films 10 </ b> A and 10 </ b> B sandwich electricity storage laminate 11 and seal electricity storage laminate 11. One laminate film 10 </ b> B is substantially flat, and the other laminate film 10 </ b> A is deformed to reflect the shape of the power storage laminate 11. The frame region 30 is thinner than the electrode region 29. In FIG. 1B, descriptions of the separator 25, the first polarizable electrode 27, and the second polarizable electrode 28 are omitted. Thickness adjustment sheets 26 are disposed on the top and bottom surfaces of the electricity storage stack 11. The thickness adjustment sheet 26 may be disposed only on the top surface or only on the bottom surface.

  FIG. 1C shows a cross-sectional view of the electricity storage laminate 11. First polarizable electrodes 27 are formed on both surfaces of the first collector electrode 21, and second polarizable electrodes 28 are formed on both surfaces of the second collector electrode 22. For example, an aluminum foil is used for the first collector electrode 21 and the second collector electrode 22. The first polarizable electrode 27 can be formed, for example, by applying a slurry containing a binder kneaded with activated carbon particles to the surface of the first collector electrode 21 and then heating and fixing the slurry. The second polarizable electrode 28 can be formed by a similar method.

The first collector electrode 21 having the first polarizable electrode 27 formed on both sides and the second collector electrode 22 having the second polarizable electrode 28 formed on both sides are alternately stacked. A separator 25 is disposed between the first polarizable electrode 27 and the second polarizable electrode 28. For the separator 25, for example, cellulose paper is used. The cell roll paper is impregnated with an electrolytic solution. For example, a polarizable organic solvent such as propylene carbonate, ethylene carbonate, or ethyl methyl carbonate is used as the solvent for the electrolytic solution. As the electrolyte (supporting salt), a quaternary ammonium salt such as SBPB ₄ (spirobipyrrolidinium tetrafluoroborate) is used. The separator 25 prevents a short circuit between the first polarizable electrode 27 and the second polarizable electrode 28 and a short circuit between the first collector electrode 21 and the second collector electrode 22.

  The laminated structure of the first collector electrode 21 and the first polarizable electrode 27 formed on both surfaces thereof, and the second collector electrode 22 and the second polarizable electrode 28 formed on both surfaces thereof. One of the laminated structures is a positive electrode plate, and the other is a negative electrode plate. The positive electrode plate and the negative electrode plate are collectively referred to as an “electrode plate”. The thickness adjustment sheet 26 shown in FIG. 1B is disposed outside at least one of the outermost electrode plates.

  Note that the first polarizable electrode 27 and the second polarizable electrode 28 are not formed on the outer surfaces of the first and second collector electrodes 21 and 22 arranged on the outermost sides, respectively. Good. In this case, the thickness adjustment sheet 26 is in contact with the first collector electrode 21 or the second collector electrode 22.

  Returning to FIG. 1B, the description will be continued. The extending portions 21 </ b> A of the plurality of first collector electrodes 21 are overlapped and ultrasonically welded to the first collector electrode tab 12. The extending portions 22 </ b> A of the plurality of second collector electrodes 22 are overlapped and ultrasonically welded to the second collector electrode tab 13. For example, an aluminum plate is used for the first collector tab 12 and the second collector tab 13.

  The second collector electrode 22, the first polarizable electrode 27, the second polarizable electrode 28, and the separator 25 are not disposed in the region where the extended portion 21 </ b> A of the first collector electrode 21 is laminated. For this reason, the portion where the extending portions 21 </ b> A are laminated is thinner than the electrode region 29. Similarly, the portion where the extended portion 22 </ b> A of the second collector electrode 22 is laminated is also thinner than the electrode region 29. The thickness adjusting sheet 26 extends to between the extending portion 21 </ b> A and the gas vent structure 15.

  The first collector electrode tab 12 and the second collector electrode tab 13 are led out to the outside of the electricity storage container 10 through between the laminate film 10A and the laminate film 10B. The first collector electrode tab 12 and the second collector electrode tab 13 are heat-sealed to the laminate film 10A and the laminate film 10B at the lead-out location. A tab film may be sandwiched between the first collector electrode tab 12 and the laminate films 10A and 10B, and between the second collector electrode tab 13 and the laminate films 10A and 10B. The tab film improves the sealing strength.

  A gas vent structure 15 is disposed between the extending portion 21A of the first collector electrode 21 and the laminate film 10A. The gas vent structure 15 is disposed so as to close the gas vent hole 14 and is heat-sealed to the laminate film 10A. The degassing structure 15 discharges the gas in the storage container 10 to the outside, but prohibits the entry of moisture and the like into the storage container 10 from the outside.

  The electricity storage container 10 is evacuated. For this reason, the laminate films 10 </ b> A and 10 </ b> B are deformed so as to follow the outer shapes of the power storage laminate 11 and the gas vent structure 15 due to atmospheric pressure.

  FIG. 1D is a cross-sectional view taken along one-dot chain line 1D-1D in FIG. 1A. The laminated structure of the electricity storage laminate 11 is the same as that shown in FIGS. 1B and 1C. Laminate films 10 </ b> A and 10 </ b> B are heat-bonded to each other in a region outside the electricity storage laminate 11. In the cross section shown in FIG. 1D, the first collector electrode 21 and the second collector electrode 22 are not provided with extended portions.

  A thickness adjustment sheet 26 is wound around the electricity storage laminate 11. In FIG. 1D, the power storage laminate 11 is rotated approximately once so as to start at an intermediate position in the thickness direction of the power storage laminate 11, cover the top surface and the other end surface, further cover the bottom surface, and return to the position of the substantially start point. is doing. A thickness adjustment sheet 26 having a thickness of one sheet is disposed on each of the top and bottom surfaces of the power storage laminate 11. Therefore, winding the thickness adjustment sheet 26 once around the power storage laminate 11 is equivalent to setting the number of the thickness adjustment sheets 26 to be two in the thickness direction of the power storage laminate 11.

  FIG. 2A shows a cross-sectional view of the power storage module according to the embodiment. In order to facilitate understanding, an xyz Cartesian coordinate system is defined.

  A plurality of flat storage cells 35 and heat transfer plates 36 are alternately stacked in the thickness direction (z direction). Each of the storage cells 35 has the same structure as that shown in FIGS. 1A to 1D. The pressing plates 42 and 43 are in close contact with the outermost storage cell 35, respectively. A plurality of tie rods 41 penetrate from one pressing plate 42 to the other pressing plate 43 and apply compressive force in the stacking direction (z direction) to the storage cells 35 and the heat transfer plate 36.

  The storage cell 35 is held between the press plates 42 and 43 by applying a compressive force in the stacking direction. The pressing plates 42 and 43 and the tie rod 41 constitute a pressurizing mechanism 40 for applying a compressive force to the storage cell 35. In addition to the tie rod 41 and the like, other means capable of applying a compressive force to the storage cell 35 may be used as the pressurizing mechanism 40.

  The first collector electrode tabs 12 of the adjacent storage cells 35 are connected to each other and the second collector tabs 13 are connected to each other so that the plurality of storage cells 35 are connected in series. All the storage cells 35 have a posture in which the first collector tab 12 is arranged in the positive direction of the x-axis as viewed from the center of the electrode region 29, that is, the vent hole 14 (FIG. 1A) is positive in the positive direction of the x-axis. Is held in a posture arranged in the direction of.

  For example, aluminum is used for the heat transfer plate 36, and stainless steel is used for the tie rod 41 and the holding plates 42 and 43, for example. A pair of wall plates 44 and 45 are arranged on both sides of the holding mechanism 40 in the x direction. Each of the wall plates 44 and 45 is fixed to the holding plates 42 and 43 with bolts.

  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 planar shape of the storage cell 35 and the heat transfer plate 36 is substantially rectangular. The first collector electrode tab 12 and the second collector electrode tab 13 are led out from opposite sides (the upper side and the lower side in FIG. 2B) of the storage cell 35. The heat transfer plate 36 extends to the outside of the edge of the storage cell 35 in plan view. The tie rod 41 is disposed at a position away from any of the storage cell 35, the heat transfer plate 36, the first collector electrode tab 12, and the second collector electrode tab 13.

  A pair of wall plates 46 and 47 are arranged on both sides of the heat transfer plate 36 in the y direction. The wall plates 46 and 47 are in contact with the end face of the heat transfer plate 36. Thereby, the heat transfer plate 36 is thermally coupled to the wall plates 46 and 47. Each of the wall plates 46 and 47 is fixed to the wall plates 44 and 45 with bolts. A channel 48 for flowing a cooling medium is formed inside the wall plates 46 and 47.

  If sufficient cooling performance can be obtained without inserting the heat transfer plate 36 between the storage cells 35, only the plurality of storage cells 35 may be stacked without arranging the heat transfer plate 36.

  3A to 3D are cross-sectional views of the power storage stack 11 and the thickness adjustment sheet 26 of the power storage cell according to the modification of the embodiment. In the above embodiment, as shown in FIG. 1D, the thickness adjustment sheet 26 makes almost one turn around the power storage laminate 11. In the modification shown in FIGS. 3A and 3B, the thickness adjustment sheet 26 makes about 1.5 turns and 2 turns, respectively. In the modification shown in FIGS. 3A and 3B, the number of the thickness adjustment sheets 26 stacked is 3 and 4, respectively.

  Also in any modification, the edge of the thickness adjustment sheet | seat 26 is arrange | positioned in the position which does not overlap with the upper surface and bottom face of the electrical storage laminated body 11, ie, the side of an end surface.

  When the edge of the thickness adjustment sheet 26 is disposed at a position where it overlaps the upper surface or the bottom surface of the electricity storage laminate 11, when a compressive force is applied to the electricity storage laminate 11, the pressure applied to the electricity storage laminate 11 is on both sides of the edge. It will be different. By disposing the edge of the thickness adjustment sheet 26 at a position that does not overlap with the upper surface and the bottom surface of the electricity storage laminate 11, it is possible to prevent the pressure applied to the electricity storage laminate 11 from becoming uneven. In the cross section shown in FIG. 1B, the edge of the thickness adjustment sheet 26 does not overlap the electrode region 29 but overlaps the frame region 30. For this reason, in the electrode area | region 29, it can prevent that a pressure becomes non-uniform | heterogenous.

  In the modification shown in FIG. 3C, separate thickness adjusting sheets 26 are arranged one by one on the top and bottom surfaces of the electricity storage laminate 11. In the modification shown in FIG. 3D, two separate thickness adjustment sheets 26 are arranged on the upper surface and the bottom surface of the electricity storage laminate 11. That is, the thickness adjustment sheet 26 disposed on the upper surface of the power storage laminate 11 and the thickness adjustment sheet 26 disposed on the bottom surface are separated from each other. Thus, instead of winding the thickness adjustment sheet 26 around the electricity storage laminate 11, a plurality of thickness adjustment sheets 26 may be stacked.

  The first polarizable electrode 27 and the second polarizable electrode 28 shown in FIG. 1C tend to vary in thickness from lot to lot due to variations in the manufacturing process. For this reason, the thickness of the electricity storage laminate 11 also varies. By changing the number of stacked thickness adjustment sheets 26 for each power storage cell 35 or for at least two power storage cells 35, the difference in thickness of the power storage stack 11 can be corrected. Thereby, the dispersion | variation in the thickness of the electrical storage cell 35 can be made small. Specifically, among the power storage cells 35, the number of stacked thickness adjustment sheets 26 of the power storage cells 35 in which the power storage stack 11 is relatively thin is relatively thick. What is necessary is just to increase more than the number of sheets of the thickness adjustment sheet 26 of the electrical storage cell 35. FIG.

  An insulating material such as polypropylene can be used for the thickness adjusting sheet 26. In this case, the thickness adjustment sheet 26 has a function of reinforcing the aluminum laminate films 10A and 10B (FIGS. 1B and 1D).

  A sheet of the same material as that of the separator 25 may be used for the thickness adjusting sheet 26. In this case, the thickness adjusting sheet 26 is impregnated with the electrolytic solution. Since the electrolyte solution that contacts the gas vent structure 15 shown in FIG. 1B is impregnated in the thickness adjusting sheet 26, it is possible to reduce the adhesion of the liquid electrolyte solution to the gas vent structure 15.

  In the above embodiment, the difference in thickness of the power storage laminate 11 was corrected by changing the number of stacked thickness adjustment sheets 26. As a modification thereof, the thickness of the thickness adjustment sheet 26 may be changed instead of changing the number of the thickness adjustment sheets 26 or changing the number of overlaps. For example, among the storage cells 35, the storage cell 35 having a relatively thin thickness of the storage stack 11, the thickness of the thickness adjustment sheet 26, and the storage cell 35 having a relatively thick storage stack 11. The thickness adjustment sheet 26 may be thicker than the thickness adjustment sheet 26.

  As shown in the above embodiment and its modifications, the total thickness in the stacking direction of the thickness adjustment sheet 26 stacked on the power storage stack 11 may be different between at least two power storage cells 35. . What is necessary is just to make the total thickness regarding the stacking direction of the thickness adjustment sheet | seat 26 relatively thick in the electrical storage cell 35 in which the thickness of the electrical storage laminated body 11 is relatively thin. Thereby, the dispersion | variation in the thickness of the electrical storage cell 35 can be made small.

  FIG. 4 shows a flowchart of a method for manufacturing a power storage module according to the embodiment. First, in step S 1, the first polarizable electrode 27 is formed on both surfaces of the first collector electrode 21 shown in FIG. 1C and the like, and the second polarizable electrode 28 is formed on both surfaces of the second collector electrode 22. To do. Thereby, a plurality of electrode plates are obtained.

  In step S2, the thickness of each electrode plate is measured. In step S3, the total thickness of the electrode plates accommodated in one power storage cell is calculated. In step S4, the calculated thickness is compared with the target thickness, and the thickness to be compensated is calculated. In step S5, the number of stacked thickness adjusting sheets 26 is calculated from the thickness to be compensated. This “number of stacked sheets” is determined so that the difference between the total thickness when the thickness adjusting sheet 26 is wound around the power storage laminate 11 and the target thickness is minimized.

  In step S6, the electrode plate and the separator are laminated to form the electricity storage laminate 11, and then the thickness adjustment sheet 26 is wound so as to have the number of overlaps calculated in step S5. In the case of the modification shown in FIGS. 3C and 3D, the thickness adjustment sheets 26 corresponding to the number of stacked sheets are stacked on the power storage stack 11. In step S <b> 7, the power storage stack 11 and the thickness adjustment sheet 26 are loaded into the power storage container 10, and then the power storage container 10 is filled with an electrolytic solution. Thereafter, the storage container 10 is sealed.

  The storage cell 35 manufactured by the method according to the embodiment has a small thickness variation. For this reason, the dispersion | variation in the dimension of the stacking direction (z direction) of the electrical storage module shown to FIG. 2A can be made small.

  FIG. 5A shows a horizontal sectional view of a power storage module according to a modification of the embodiment. The power storage cells 35, the heat transfer plates 36, the pressing plates 42 and 43, and the tie rods 41 that are alternately stacked constitute one power storage module 50. These configurations are the same as those of the storage cell 35, the heat transfer plate 36, the pressing plates 42 and 43, and the tie rod 41 shown in FIG. 2A. A plurality of, for example, three power storage modules 50 are arranged in a direction (y direction) orthogonal to the stacking direction (z direction).

  A partition wall 53 is disposed between the storage modules 50 adjacent to each other. Side plates 51 and 52 are respectively arranged outside the power storage modules 50 on both sides. The side plates 51 and 52 and the partition wall 53 are in contact with the end face of the heat transfer plate 36, similarly to the wall plates 46 and 47 shown in FIG. 2B.

  FIG. 5B is a cross-sectional view taken along one-dot chain line 5B-5B in FIG. 5A. A cross-sectional view taken along one-dot chain line 5A-5A in FIG. 5B corresponds to FIG. 5A. A flow path 57 for flowing a cooling medium is formed in the partition wall 53 and the side plates 51 and 52.

  The top plate 54 and the bottom plate 55 sandwich the power storage module 50, the partition wall 53, and the side plates 51 and 52 from above and below. The top plate 54 and the bottom plate 55 correspond to the wall plates 44 and 45 shown in FIG. 2B, respectively. The top plate 54 and the bottom plate 55 are fixed to the partition wall 53 and the side plates 51 and 52 by bolts 60. Furthermore, as shown in FIG. 5A, the top plate 54 and the bottom plate 55 are also fixed to the holding plates 42 and 43 by bolts 61.

  By using the electricity storage cell 35 according to the embodiment, the variation in the dimensions of the electricity storage module 50 in the stacking direction (z direction) of the electricity storage cells 35 can be reduced. When the dimensional variation in the z direction of the power storage module 50 is large, the positions of the through holes for the bolts 61 formed in the top plate 54 and the bottom plate 55 vary. For this reason, it is difficult to form a through hole in a specific position in advance. Alternatively, it is necessary to make the through hole for the bolt 61 a long hole so as to absorb the variation in the dimension of the power storage module 50 in the z direction.

  By using the electricity storage cell 35 according to the embodiment, a through hole for the bolt 61 can be formed in advance at a specific position of the top plate 54 and the bottom plate 55. Moreover, it is not necessary to make the through hole a long hole.

  FIG. 6 is a schematic plan view of a hybrid excavator as an example of a work machine on which the power storage module according to the above embodiment is mounted. A traveling device 71 is attached to the revolving body 70 via a revolving bearing 73. An engine 74, a hydraulic pump 75, a turning electric motor 76, an oil tank 77, a cooling fan 78, a seat 79, a power storage module 80, and a motor generator 83 are mounted on the turning body 70. The engine 74 generates power by burning fuel. The engine 74, the hydraulic pump 75, and the motor generator 83 transmit and receive torque to each other via the torque transmission mechanism 81. The hydraulic pump 75 supplies pressure oil to a hydraulic cylinder such as the boom 82.

  The motor generator 83 is driven by the power of the engine 74 to generate power (power generation operation). The generated power is supplied to the power storage module 80, and the power storage module 80 is charged. In addition, the motor generator 83 is driven by the electric power from the power storage module 80 and generates power for assisting the engine 74 (assist operation). The oil tank 77 stores oil of the hydraulic circuit. The cooling fan 78 suppresses an increase in the oil temperature of the hydraulic circuit. The operator sits on the seat 79 and operates the hybrid excavator.

  FIG. 7 shows a side view of the hybrid excavator. An upper swing body 70 is mounted on the lower traveling body 71 via a swing bearing 73. The upper turning body 70 turns clockwise or counterclockwise with respect to the lower traveling body 71 by the driving force from the turning electric motor 76 (FIG. 11). A boom 82 is attached to the upper swing body 70. The boom 82 swings in the vertical direction with respect to the upper swing body 70 by a hydraulically driven boom cylinder 87. 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 a hydraulically driven arm cylinder 88. 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 89.

  The power storage module 80 is mounted on the upper swing body 70 via a power storage module mount 90 and a damper (vibration isolation device) 91. The power storage module 80 uses the power storage module according to the embodiment shown in FIGS. 2A and 2B or the embodiment shown in FIGS. 4A and 4B. The electric motor 76 for turning (FIG. 6) is driven by the electric power supplied from the power storage module 80. When the turning electric motor 76 is driven, the turning body 70 to be driven turns. In addition, the turning electric motor 76 generates regenerative electric power by converting kinetic energy into electric energy. The power storage module 80 is charged by the generated regenerative power.

  6 and 7 show a hybrid excavator as an example of a work machine. However, the power storage module according to the above embodiment can be applied to other hybrid work machines such as a hybrid wheel loader and a hybrid bulldozer. It is. Furthermore, the power storage module according to the above embodiment can be applied to an electric work machine such as an electric excavator, an electric wheel loader, and an electric bulldozer.

  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 10 Electric storage container 10A, 10B Laminate film 11 Electric power storage laminated body 12 1st collector electrode tab 13 2nd collector electrode tab 14 Gas vent hole 15 Gas vent structure 21 1st collector electrode 21A Extending part 22 2nd collector electrode 22A Stretched portion 25 Separator 26 Thickness adjustment sheet 27 First polarizable electrode 28 Second polarizable electrode 29 Electrode region 30 Frame region 35 Power storage cell 40 Pressurization mechanism 41 Tie rod 42, 43 Presser plates 44, 45, 46, 47 Wall plate 48 Channel 50 Power storage module 51, 52 Side plate 53 Partition wall 54 Top plate 55 Bottom plate 57 Channel 60, 61 Bolt 70 Rotating body (drive target)
71 Traveling Device 73 Slewing Bearing 74 Engine 75 Hydraulic Pump 76 Swivel Motor 77 Oil Tank 78 Cooling Fan 79 Seat 80 Power Storage Module 81 Torque Transmission Mechanism 82 Boom 83 Motor Generator 85 Arm 86 Bucket 87 Boom Cylinder 88 Arm Cylinder 89 Bucket Cylinder

Claims (7)

A plurality of flat storage cells stacked in the thickness direction;
A pressure mechanism that applies a compressive force in the stacking direction to the electricity storage cell;
Each of the storage cells
An electricity storage laminate including positive and negative plates stacked alternately via separators;
An insulating thickness adjusting sheet disposed on the outer side of at least one of the positive electrode plate disposed on the outermost side and the negative electrode plate disposed on the outermost side;
The power storage laminate, the thickness adjustment sheet, and a power storage container for storing an electrolyte solution,
The electrical storage module in which the total thickness of the thickness adjustment sheet differs in at least two of the electrical storage cells with respect to the stacking direction of the electrical storage laminate.   2. The total thickness of the thickness adjustment sheets is made different by changing the number of the thickness adjustment sheets stacked in at least two of the storage cells with respect to the stacking direction of the storage cells. Power storage module.   Among the storage cells, the number of the thickness adjustment sheets stacked in the storage cell having a relatively thin storage stack is the thickness of the storage cell having a relatively thick storage stack. The power storage module according to claim 2, wherein the power storage module is larger than the number of the adjustment sheets stacked.   The electrical storage according to claim 2 or 3, wherein the thickness adjustment sheet is wound around the electrical storage laminate, and the number of the thickness adjustment sheets is changed by changing the number of windings for each electrical storage cell. module.   The thickness adjusting sheet is a sheet in which a thickness adjusting sheet disposed on one surface of the electricity storage laminate and a thickness adjusting sheet disposed on the other surface are separated from each other. The electrical storage module of any one of these.   The power storage module according to claim 1, wherein the thickness adjustment sheet is impregnated with the electrolytic solution. A working machine equipped with a power storage module,
The electricity storage module is:
A plurality of flat storage cells stacked in the thickness direction;
A compression mechanism for applying a compressive force in the stacking direction to the electricity storage cell;
Each of the storage cells
An electricity storage laminate including positive and negative plates stacked alternately via separators;
An insulating thickness adjusting sheet disposed on the outer side of at least one of the positive electrode plate disposed on the outermost side and the negative electrode plate disposed on the outermost side;
The power storage laminate, the thickness adjustment sheet, and a power storage container for storing an electrolyte solution,
A working machine in which a total thickness of the thickness adjustment sheets is different in at least two of the storage cells with respect to a stacking direction of the storage stack.

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