JP2012256650A - Power storage module and working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module which allows easy alignment of electrode tabs of power storage cells.SOLUTION: A plurality of power storage cell are laminated. Each of the power storage cells includes first and second electrode tabs in which slits are formed. The first electrode tab of one of two power storage cells adjacent to each other and the second electrode tab of the other are connected by being superposed on each other. The slits of the first electrode tab and the second electrode tab connected to each other are engaged with each other.

Description

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

  Development of hybrid work machines using storage cells such as rechargeable secondary batteries and electric double layer capacitors is in progress. As a power storage cell employed in a hybrid work machine, a plate-shaped power storage cell in which a power storage element is wrapped with a film has been proposed. A positive electrode and a negative electrode are derived from the outer periphery of the storage cell.

  A power storage module is formed by stacking a plurality of power storage cells and connecting them in series. The electrode tabs of the storage cells adjacent in the stacking direction are electrically connected by welding, caulking, or the like.

JP 2006-185733 A JP 2005-268138 A

  When connecting the electrode tabs of the storage cell by welding or the like, it is necessary to align the two electrode tabs to be connected. When misalignment occurs at the connection portion of the electrode tab, the misalignment is superimposed and increased when a plurality of storage cells are stacked. In particular, when a laminate film is used for the storage cell container, the positional relationship between the electrode tab and the laminate film is not always constant. For this reason, it is not preferable to use the edge of the laminate film as a reference for alignment.

  The objective of this invention is providing the electrical storage module which can perform alignment of the electrode tab of an electrical storage cell easily. Another object of the present invention is to provide a work machine equipped with the power storage module.

According to one aspect of the invention,
Having a plurality of stacked storage cells,
Each of the energy storage cells includes first and second electrode tabs having slits formed therein, one first electrode tab of two adjacent energy storage cells, and the other second electrode tab, Are connected to each other so that the slits of the first electrode tab and the slit of the second electrode tab connected to each other mesh with each other.

  According to the other viewpoint of this invention, the working machine which has the electric motor driven with the said electrical storage module and the electric power from an electrical storage module is provided.

  By engaging the slit, the first electrode tab and the second electrode tab can be easily positioned.

1A is a plan view of a power storage cell used in the power storage module according to Embodiment 1, FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A, and FIG. 1C is a cross-sectional view of a power storage element. . FIG. 2 is a cross-sectional view of the power storage module according to the first embodiment. FIG. 3A is a perspective view of a connection portion of the electrode tab, and FIG. 3B is a plan view thereof. FIG. 4 is a cross-sectional view of a power storage module according to a modification of the first embodiment. FIG. 5A is a plan view of a power storage cell used in the power storage module according to the second embodiment, and FIG. 5B is a plan view of a connection portion of the electrode tab. FIG. 6 is a plan view of a power storage cell used in the power storage module according to the third embodiment. FIG. 7 is a cross-sectional view of the power storage module according to the third embodiment. FIG. 8 is a perspective view of a connection portion of the electrode tab. FIG. 9 is a cross-sectional view of a power storage module according to a modification of the third embodiment. FIG. 10 is a plan view of a power storage cell used in the power storage module according to the fourth embodiment. FIG. 11 is a cross-sectional view of the power storage module according to the fourth embodiment. 12A and 12B are plan views of connection portions of electrode tabs. 13A and 13B are plan views of a power storage cell used in the power storage module according to the fifth embodiment. FIG. 14 is a cross-sectional view of the power storage module according to the fifth embodiment. 15A and 15B are cross-sectional views of the power storage module according to the sixth embodiment. FIG. 16 is a plan view of a hybrid excavator according to the seventh embodiment.

[Example 1]
FIG. 1A is a plan view of a power storage cell 20 used in the power storage module according to the first embodiment. The storage cell 20 includes a plate-like portion 16 having a function of storing electric energy, and a first electrode tab 12 and a second electrode tab 13 that are drawn out in opposite directions from the edge of the plate-like portion 16. Including. The plate-like portion 16 includes a power storage element 11 and a power storage container 10 that houses the power storage element 11. The planar shape of the plate-like portion 16 is, for example, a rectangle with a slightly rounded vertex.

  The first electrode tab 12 and the second electrode tab 13 are drawn from the inside of the electricity storage container 10 to the outside of the electricity storage container 10 so as to intersect the edge of the electricity storage container 10. The first electrode tab 12 and the second electrode tab 13 act as electrodes having opposite polarities.

  A slit 14 is formed from the leading edge of the first electrode tab 12 toward the base, and a slit 15 is formed from the leading edge of the second electrode tab 13 toward the base. The slits 14 and 15 are arranged on one virtual straight line.

  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. Laminate films 10 </ b> A and 10 </ b> B sandwich power storage element 11 and seal power storage element 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 electricity storage element 11.

  FIG. 1C shows a partial cross-sectional view of the electricity storage element 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 23 is disposed between the first polarizable electrode 27 and the second polarizable electrode 28. For the separator 23, 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 23 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 first collector electrode 21, the second polarizable electrode 28, and the separator 23 constitute an electric double layer capacitor.

  In addition to the electric double layer capacitor, a lithium ion capacitor, a lithium ion secondary battery, or the like may be used as the storage cell 20.

  Returning to FIG. 1B, the description will be continued. In FIG. 1B, the description of the separator 23, the first polarizable electrode 27, and the second polarizable electrode 28 is omitted.

  The first collector electrode 21 and the second collector electrode 22 respectively have extending portions 21A and 22A extending from the overlapping regions of the first collector electrode 21 and the second collector electrode 22 in opposite directions (leftward and rightward in FIG. 1B). The extending portions 21 </ b> A of the plurality of first collector electrodes 21 are overlapped and ultrasonically welded to the first 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 electrode tab 13. For example, an aluminum plate is used for the first electrode tab 12 and the second electrode tab 13.

  The first electrode tab 12 and the second electrode tab 13 pass between the laminate film 10 </ b> A and the laminate film 10 </ b> B and are led out to the outside of the electricity storage container 10. The first electrode tab 12 and the second electrode tab 13 are thermally welded to the laminate film 10A and the laminate film 10B at the lead-out location. Note that a tab film may be sandwiched between the first electrode tab 12 and the laminate films 10A and 10B, and between the second electrode tab 13 and the laminate films 10A and 10B. The tab film improves the sealing strength.

  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 shape of the electricity storage element 11 due to the atmospheric pressure. The 1st electrode tab 12 and the 2nd electrode tab 13 are attached to the position biased to the laminate film 10B side rather than the center in the thickness direction of the electricity storage cell 20. In this specification, the surface of the laminate film 10B that is nearly flat is referred to as a “rear surface”. The surface of the laminate film 10A that is deformed reflecting the outer shape of the power storage element 11 is referred to as an “abdominal surface”.

  As shown in FIG. 2, the plurality of power storage cells 20 are stacked and connected in series with their abdominal surfaces facing in the same direction. An xyz orthogonal coordinate system in which the stacking direction is the z direction is defined. The direction in which the belly surface of the storage cell 20 faces is the negative direction of the z axis. The direction in which the first electrode tab 12 and the second electrode tab 13 are drawn out is defined as the x direction.

  The abdominal surface of one energy storage cell 20 and the back surface of the energy storage cell 20 adjacent to it contact each other. A heat transfer plate for radiating the heat generated in the storage cell may be sandwiched between the storage cells 20 adjacent to each other. Among the storage cells 20 adjacent to each other, the first electrode tab 12 of one storage cell 20 and the second electrode tab 13 of the other storage cell 20 are drawn out in the same direction. The first electrode tab 12 and the second electrode tab 13 are bent so as to approach each other, and overlap each other at the tip portion rather than the bent portion. The overlapping portion is, for example, ultrasonic welded. In addition, when the electrical storage cell 20 has no polarity, it is not necessary to distinguish between the first electrode tab 12 and the second electrode tab 13. One of the pair of electrode tabs of the storage cell 20 may correspond to the first electrode tab 12 and the other corresponds to the second electrode tab 13.

  FIG. 3A shows a perspective view of a contact portion between the first electrode tab 12 and the second electrode tab 13. The tip portion from the bent portion of the first electrode tab 12 and the tip portion from the bent portion of the second electrode tab 13 are overlapped. The slits 14 and 15 mesh with each other. As a result, the second electrode tab 13 is inserted into the slit 14, and the first electrode tab 12 is inserted into the slit 15. By engaging the slits 14 and 15, the first electrode tab 12 and the second electrode tab 13 are formed with slopes 17 having a height corresponding to the thickness thereof. The slopes 17 are in contact with each other.

  FIG. 3B shows a plan view of a contact portion between the first electrode tab 12 and the second electrode tab 13. The slit 14 and the slit 15 are arranged so as to be positioned on one virtual straight line. The slit 15 of the first electrode tab 12 and the second electrode tab 13 is brought into contact with the inner end of the slit 14 (the end opposite to the opening end) and the inner end of the slit 15. , 14, that is, the position in the z direction is regulated. The position in the z direction is also regulated by the contact between the slope 17 of the first electrode tab 12 shown in FIG. 3A and the slope 17 of the second electrode tab 13 facing the first slope. Furthermore, when the inclined surfaces 17 are in contact with each other, the first electrode tab 12 and the second electrode tab 13 are less likely to be displaced with respect to the rotation direction about the axis parallel to the x axis.

  The positional relationship (upper limit relationship) in the thickness direction between the first electrode tab 12 and the second electrode tab 13 is reversed on both sides of the imaginary straight line along which the slits 14 and 15 extend.

  1 and 2 show an example in which one surface (rear surface) of the electrode cell 20 is substantially flat and the other surface (abdominal surface) is swollen. As shown in FIG. 4, the connection of the electrode cell 20 having a structure in which the bases of the first electrode tab 12 and the second electrode tab 13 are attached to substantially the center in the thickness direction of the electrode cell 20 is also described above. The connection structure of Embodiment 1 can be applied.

  In Example 1, the slits 14 and 15 are engaged with each other, thereby aligning the first electrode tab 12 and the second electrode tab 13 connected to each other in the y direction (FIGS. 2 and 4). It can be done easily. Moreover, since the insertion depth is also restricted, the area of the portion where the first electrode tab 12 and the second electrode tab 13 overlap can be maintained constant.

[Example 2]
FIG. 5A is a plan view of the storage cell 20 according to the second embodiment. Hereinafter, description will be made by paying attention to differences from the storage cell 20 according to the first embodiment shown in FIG. 1A, and description of the same configuration will be omitted.

  In Example 1, one slit 14 and 15 was formed in the first electrode tab 12 and the second electrode tab 13, respectively. In the second embodiment, a plurality of, for example, two slits 14 and 15 are formed in each of the first electrode tab 12 and the second electrode tab 13. The plurality of slits 14 and the plurality of slits 15 correspond one to one.

  FIG. 5B shows a plan view of the overlapping portion of the first electrode tab 12 and the second electrode tab 13. The slits 14 mesh with the corresponding slits 15 respectively. Thereby, the positioning accuracy of the 1st electrode tab 12 and the 2nd electrode tab 13 can be raised.

[Example 3]
In FIG. 6, the top view of the electrical storage cell 20 used for the electrical storage module by Example 3 is shown. Hereinafter, description will be made by paying attention to differences from the storage cell 20 according to the first embodiment shown in FIG. 1A, and description of the same configuration will be omitted.

  In Example 1, as shown in FIG. 1A, the slit 14 was formed from the edge of the tip of the first electrode tab 12 toward the base. In Example 3, a slit 14a is formed in the first electrode tab 12 from one edge along the lead-out direction of the electrode tab toward the other edge. The length of the slit 14 a is substantially equal to the width of the second electrode tab 13. For this reason, the width of the first electrode tab 12 is slightly wider than the width of the second electrode tab 13. The configuration of the slit 15 formed in the second electrode tab 13 is the same as that of the first embodiment.

  FIG. 7 shows a cross-sectional view of a power storage module in which a plurality of power storage cells 20 are stacked. The storage cells 20 adjacent to each other are stacked in a posture in which the abdominal surfaces or the back surfaces are opposed to each other. One of the adjacent energy storage cells 20 has the structure shown in FIG. 1A, and the other energy storage cell 20 has the structure shown in FIG.

  The connection structure between one first electrode tab 12 and the other second electrode tab 13 of the electricity storage cell 20 in which the abdominal surfaces are opposed to each other is according to Example 1 shown in FIGS. 2, 3A, and 3B. This is the same as the connection structure of the power storage module. However, in the case of Example 3, the interval L1 between the bases of the first electrode tab 12 and the second electrode tab 13 connected to each other is wider than the interval between the bases in Example 1. For this reason, the area | region (overlap allowance) in which the 1st electrode tab 12 and the 2nd electrode tab 13 have overlapped can be ensured widely.

  In FIG. 8, the perspective view of the connection location of one 1st electrode tab 12 and the other 2nd electrode tab 13 of the electrical storage cell 20 which made the back surfaces oppose is shown. The 1st electrode tab 12 and the 2nd electrode tab 13 are bent in the same direction, and both have overlapped in the part of a tip from a bent part. The slit 14a of the first electrode tab 12 and the slit 15 of the second electrode tab 13 are engaged with each other in a posture orthogonal to each other.

  The lateral edge of the second electrode tab 13 is in contact with the inner end of the slit 14a, whereby the width direction between the first electrode tab 12 and the second electrode tab 13 (y direction in FIG. 7). Can be easily positioned. The edge of the first electrode tab 12 that appears on the side surface of the slit 14 a comes into contact with the inner end of the slit 15, thereby restricting the depth of insertion.

  In addition, a slope is formed on the second electrode tab 13 corresponding to the slit 14a. The slope and the edge of the slit 14a are in contact with each other at the straight line 18 portion. Thereby, it is possible to prevent displacement of the first electrode tab 12 and the second electrode tab 13 with respect to the rotation direction about the axis parallel to the x-axis.

  FIG. 9 shows a cross-sectional view of a power storage module according to a modification of the third embodiment. Hereinafter, description will be made by paying attention to differences from the third embodiment shown in FIG. 7, and description of the same configuration will be omitted. In this modification, the battery cell 20 is stacked in a posture in which the stomach surface faces the negative direction of the z-axis. The connection structure between the first electrode tab 12 and the second electrode tab 13 drawn in the negative direction of the x-axis is the connection structure of the electricity storage module according to the first embodiment shown in FIGS. 2, 3A, and 3B. Is the same.

  A slit 14a shown in FIG. 6 is formed in the first electrode tab 12 drawn in the positive direction of the x-axis. The second electrode tab 12 and the second electrode tab 13 are bent in a direction approaching each other, and further bent in a positive direction of the x axis. The first electrode tab 12 and the second electrode tab 13 overlap each other at the tip portion of the portion bent in the positive direction of the x axis. In the overlapping portion, the slit 14a of the first electrode tab 12 and the slit 15 of the second electrode tab 13 are engaged with each other. The meshing structure is the same as that shown in FIG.

  Also in this modified example, as in the third embodiment, the first electrode tab 12 and the second electrode tab 13 can be easily positioned in the width direction (y direction in FIG. 9), and the insertion depth can be reduced. Can be regulated.

[Example 4]
In FIG. 10, the top view of the electrical storage cell 20 used for the electrical storage module by Example 4 is shown. Hereinafter, description will be made by paying attention to differences from the storage cell 20 according to the first embodiment shown in FIG. 1A, and description of the same configuration will be omitted.

  A slit 14b is formed in the first electrode tab 12 from one edge along the lead-out direction (one edge substantially parallel to the lead-out direction) toward the opposite edge. Similarly, the second electrode tab 13 is also formed with a slit 15b from one edge along the lead-out direction toward the opposite edge. The width of the first electrode tab 12 is equal to the width of the second electrode tab 13, and the lengths of the slit 14 b and the slit 15 b are about half of the width of the first electrode tab 12. The slit 14 b and the slit 15 b are formed at positions that are point-symmetric with respect to the center of the storage cell 20.

  FIG. 11 shows a cross-sectional view of a power storage module in which the power storage cells 20 are stacked. The storage cells 20 adjacent to each other are stacked in a posture in which the abdominal surfaces or the back surfaces are opposed to each other.

  One first electrode tab 12 and the other second electrode tab 13 of the electricity storage cell 20 with the abdominal surfaces facing each other are bent in a direction approaching each other, and overlap each other at the tip portion from the bent portion. . One first electrode tab 12 and the other second electrode tab 13 of the storage cell 20 with the back surfaces facing each other are bent in the same direction and overlap each other at the tip portion from the bent portion.

  FIG. 12A shows a plan view of an electrode connection portion of the storage cell 20 in which the abdominal surfaces face each other. The slit 14b of the first electrode tab 12 and the slit 15b of the second electrode tab 13 are engaged with each other. The slit 14b and the slit 15b are disposed so as to be positioned on one virtual straight line. On both sides of the imaginary straight line, the positional relationship (vertical relationship) in the thickness direction between the first electrode tab 12 and the second electrode tab 13 is reversed.

  The portion of the first electrode tab 12 at the tip from the slit 14b is in contact with the portion of the second electrode tab 13 on the base side from the slit 15b. Similarly, the tip portion of the second electrode tab 13 from the slit 15b is in contact with the base portion side of the first electrode tab 12 from the slit 14b.

  FIG. 12B shows a plan view of the electrode connection portion of the storage cell 20 with the back surfaces facing each other. Similar to the connection structure of FIG. 12A, the slit 14b of the first electrode tab 12 and the slit 15b of the second electrode tab 13 are engaged with each other. The difference from FIG. 12A is that the tip portions of the first electrode tab 12 and the second electrode tab 13 are in contact with each other, and the base side portions are in contact with each other.

  In both FIG. 12A and FIG. 12B, the width direction between the first electrode tab 12 and the second electrode tab 13 due to the contact between the inner end of the slit 14 b and the inner end of the slit 15 b. Positioning is performed with respect to (the vertical direction in FIGS. 12A and 12B).

  In addition, as shown in FIG. 2, the electrode tab connection structure according to Example 4 has the storage cell 20 stacked in a posture in which the abdominal surface is directed in the same direction, and as illustrated in FIG. 4. The present invention is also applicable to the case where the base portions of the first electrode tab 12 and the second electrode tab 13 are attached to the center of the storage cell 20 in the thickness direction.

[Example 5]
13A and 13B are plan views of the storage cell 20 used in the storage module according to the fifth embodiment. Hereinafter, description will be made by paying attention to differences from the storage cell 20 according to the fourth embodiment shown in FIG. 10, and description of the same configuration will be omitted.

  In Example 10, the 1st and 2nd electrode tabs 12 and 13 were pulled out from the edge of the electrical storage container 10 on the opposite side. In the fifth embodiment, the first and second electrode tabs 12 and 13 are drawn from the same edge in the same direction.

  A slit 14b is formed in the first electrode tab 12 from one edge along the lead-out direction (one edge substantially parallel to the lead-out direction) toward the opposite edge. Similarly, the second electrode tab 13 is also formed with a slit 15b from one edge along the lead-out direction toward the opposite edge. The width of the first electrode tab 12 is equal to the width of the second electrode tab 13, and the lengths of the slit 14 b and the slit 15 b are about half of the width of the first electrode tab 12. The opening ends of the slit 14b and the slit 15b face the same direction. In the electricity storage cell 20 shown in FIG. 13A, when the first and second electrode tabs 12 and 13 are directed upward and viewed from the abdominal surface, the open ends of the slits 14b and 15b face rightward. In the electricity storage cell 20 shown in FIG. 13B, the opening ends of the slits 14b and 15b face leftward when viewed from the abdominal surface side with the first and second electrode tabs 12 and 13 facing upward.

  When the power storage cell 20 shown in FIG. 13A and the power storage cell 20 shown in FIG. 13B are overlapped in a posture where the abdomen faces in the same direction, the slit 14b of one power storage cell 20 and the power storage cell 20 The slit 15b can be engaged. The structure of the meshing portion is the same as the structure of FIG. 12A or 12B of the fourth embodiment.

  FIG. 14 is a cross-sectional view of a power storage module configured by stacking power storage cells 20 and engaging slits 14b and 15b. In the upper part of FIG. 14, two sets of electrode tabs 12 and 13 are connected. In FIG. 14, only one set of electrode tabs 12 and 13 appears, and another set of electrode tabs 12 and 13 is connected in a cross section different from the cross section shown in FIG.

  In FIG. 14, the structure shown in FIG. 12B is adopted as the structure of the meshing portion, but the structure shown in FIG. 12A may be adopted.

  In the fifth embodiment, similarly to the fourth embodiment, the first electrode tab 12 and the second electrode tab 13 can be easily positioned.

[Example 6]
FIG. 15A shows a cross-sectional view of a power storage module according to the sixth embodiment. A plurality of power storage cells 20 are stacked in the thickness direction. An xyz orthogonal coordinate system in which the thickness direction (stacking direction) of the storage cell 20 is defined as the z-axis direction is defined. The configuration of the storage cell 20 and the posture in which the storage cell 20 is stacked are the same as those shown in any of the first to fourth embodiments. A heat transfer plate 25 is disposed between the storage cells 20 adjacent in the z direction.

  For example, aluminum is used for the heat transfer plate 25. The heat transfer plate 25 has a storage cell in a direction different from the y direction (corresponding to the y direction in FIG. 2), that is, the direction in which the first electrode tab 12 and the second electrode tab 13 are drawn (x direction) It extends outside the 20 edges.

  The pressurizing mechanism 40 applies a compressive force in the stacking direction (z direction) to the stacked body including the storage cell 20 and the heat transfer plate 25. The pressurizing mechanism 40 includes a pair of pressing plates 41, four tie rods 43, and a nut 42. The holding plates 41 are disposed at both ends of a laminate composed of the storage cell 20 and the heat transfer plate 25. The tie rod 43 penetrates from one holding plate 41 to the other holding plate 41, and applies a force in a direction that narrows the distance between the pair of holding plates 41 to each other. The tie rod 43 is disposed at a position that does not spatially interfere with the heat transfer plate 25 in the xy plane.

  Wall plates 31 and 32 sandwich the stacked body including the storage cell 20 and the heat transfer plate 25 in the y direction. The wall plates 31 and 32 are arranged in a posture perpendicular to the y-axis, and are fixed to the holding plate 41 with bolts. The wall plates 31 and 32 are thermally coupled to the heat transfer plate 25 at the end face of the heat transfer plate 25. For example, the wall plates 31 and 32 and the heat transfer plate 25 may be brought into direct contact with each other, both may be fixed with a heat conductive adhesive, or a heat transfer rubber sheet may be sandwiched between them. Heat generated in the storage cell 20 is conducted to the wall plates 31 and 32 via the heat transfer plate 25. By forcibly cooling the wall plates 31 and 32 by water cooling or the like, the temperature rise of the storage cell 20 can be reduced.

  FIG. 15B is a cross-sectional view taken along one-dot chain line 15B-15B in FIG. 15A. A cross-sectional view taken along one-dot chain line 15A-15A in FIG. 15B corresponds to FIG. 15A. The plurality of stacked storage cells 20 are connected in series by the first electrode tab 12 and the second electrode tab 13. The connection structure between the first electrode tab 12 and the second electrode tab 13 is the same as that of any one of the first to fourth embodiments. The first electrode tab 12 and the second electrode tab 13 are bent so as not to contact the heat transfer plate 25.

  Wall plates 33 and 34 sandwich the stacked body including the storage cell 20 and the heat transfer plate 25 in the x direction. The wall plates 33 and 34 are fixed to the holding plate 41 with bolts. Although not appearing in FIG. 15B, the wall plates 31 and 32 (FIG. 15A) are also fixed by bolts. The pressing plate 41 and the wall plates 31, 32, 33, and 34 constitute a parallelepiped casing.

  The wall plates 33 and 34 are provided with windows 33A and 34A, respectively. Forced air cooling mechanisms 48 and 49 are disposed in the windows 33A and 34A, respectively. The forced air cooling devices 48 and 49 forcibly cool the inside of the housing.

[Example 7]
In the seventh embodiment, a hybrid excavator equipped with at least one power storage module of the first to sixth embodiments is illustrated.

  FIG. 16 is a schematic plan view of a hybrid excavator according to the seventh embodiment. A traveling device 71 is attached to the revolving body 70 via a revolving bearing 73. An engine 74, a hydraulic pump 75, an 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 swing body 70. 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.

  As the power storage module 80, any one of the power storage modules of the first to sixth embodiments is used. The turning motor 76 is driven by the electric power supplied from the power storage module 80. The turning motor 76 turns the turning body 70. Moreover, the turning 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.

  FIG. 16 shows a hybrid excavator to which the power storage module of Example 1 or Example 2 is applied, but the power storage module of Example 1 or Example 2 may be another hybrid work machine, for example, a hybrid type It is also possible to apply to a wheel loader and a hybrid bulldozer. Further, it can be applied to an electric work machine.

  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 Power storage container 10A, 10B Laminate film 11 Power storage element 12 1st electrode tab 13 2nd electrode tab 14, 15 Slit 16 Plate-shaped part 17 Slope area | region 18 The linear part 20 which contacts Power storage cell 21 1st collector electrode 21A Stretching Part 22 Second collector electrode 22A Extending part 23 Separator 25 Heat transfer plate 27 First polarizable electrode 28 Second polarizable electrode 31, 32, 33, 34 Wall plate 33A, 34A Window 40 Pressure mechanism 41 Press plate 42 Nut 43 Tie rod 48, 49 Forced air cooling device 70 Revolving body 71 Traveling device 73 Swivel bearing 74 Engine 75 Hydraulic pump 76 Swing motor 77 Oil tank 78 Cooling fan 79 Seat 80 Power storage module 81 Torque transmission mechanism 82 Boom 83 Motor generator

Claims (6)

Having a plurality of stacked storage cells,
Each of the energy storage cells includes first and second electrode tabs having slits formed therein, one first electrode tab of two adjacent energy storage cells, and the other second electrode tab, Are stacked and connected to each other, and the slits of the first electrode tab and the slit of the second electrode tab connected to each other mesh with each other.   The slits of the first electrode tabs and the slits of the second electrode tabs connected to each other are arranged in a posture along one straight line, and at the ends of the slits of the first electrode tabs, The power storage module according to claim 1, wherein an insertion depth is regulated by contact of an end portion of the slit of the second electrode tab.   A plurality of slits are formed in the first and second electrode tabs in parallel with each other, and the slits of the first electrode tab and the slits of the second electrode tab have a one-to-one correspondence. The power storage module according to claim 2, wherein slits corresponding to each other mesh with each other. The power storage cell includes a power storage container that houses a plate-shaped power storage structure, and the first and second electrode tabs drawn from an edge of the power storage container,
The slits formed in the first electrode tab and the second electrode tab are formed from the tip toward the base,
The storage cells adjacent to each other are stacked in a posture in which the first electrode tab of one storage cell and the second electrode tab of the other storage cell are pulled out in the same direction, and the first 4. The power storage module according to claim 1, wherein the electrode tab and the second electrode tab are bent toward each other, and overlap each other at a tip portion rather than a bent portion. The power storage cell includes a power storage container that houses a plate-shaped power storage structure, and the first and second electrode tabs drawn from an edge of the power storage container,
The slit formed in the first electrode tab and the second electrode tab is formed from one edge along the drawn-out direction toward the opposite edge. Power storage module. An electricity storage module;
A working machine having an electric motor driven by electric power supplied from the power storage module,
The power storage module has a plurality of stacked power storage cells,
Each of the energy storage cells includes first and second electrode tabs having slits formed therein, one first electrode tab of two adjacent energy storage cells, and the other second electrode tab, Are connected to each other, and the slits of the first electrode tab and the slit of the second electrode tab connected to each other mesh with each other.

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