JP2015159658A - power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device which includes a voltage equalization circuit and flexibly deals with increase and decrease in the number of power storage cells serially connected with each other.SOLUTION: A housing including a bottom surface, a side surface, and an upper surface is mounted on a machine body of a shovel. A power storage module including multiple power storage cells is disposed in the housing. A support member is fixed in the housing. The support member includes a support wall which is disposed in a posture perpendicular to the bottom surface of the housing. A least one circuit board, on which an equalization circuit which equalizes a voltage across terminals of the power storage cells is mounted, is supported by the support wall.

Description

  The present invention relates to a power storage device having a plurality of power storage cells connected in series and a voltage equalization circuit connected to each power storage cell.

  A power storage module configured by connecting a plurality of power storage cells in series is mounted on a hybrid work machine. For example, an electric double layer capacitor, a lithium ion capacitor, a lithium ion secondary battery, or the like is used for the storage cell. A voltage equalization circuit (balance circuit) that limits the inter-terminal voltage to a predetermined value or less is connected to the plurality of storage cells connected in series (Patent Document 1).

  The electricity storage cell disclosed in Patent Document 1 has a positive electrode terminal and a negative electrode terminal on its upper surface. The plurality of power storage cells are arranged in a line. One board | substrate with which the wiring pattern was formed is arrange | positioned on a some electrical storage cell. A plurality of power storage cells are connected in series by a wiring pattern formed on the substrate. A voltage equalizing circuit is provided on the substrate corresponding to the storage cell.

  The discharge current flowing through the voltage equalization circuit increases as the voltage between the terminals of the storage cell increases. Furthermore, the discharge current increases as the temperature of the storage cell increases. Thereby, appropriate discharge according to the temperature of the electricity storage cell is possible, and the life of the electricity storage cell can be extended.

JP 2002-42903 A

  In the power storage device disclosed in the cited document 1, a voltage equalization circuit for the power storage cell is provided in a region of the substrate immediately above each power storage cell. The dimension of the substrate depends on the length of a cell row composed of a plurality of power storage cells connected in series. As the number of storage cells increases or decreases, the dimensions of the substrate must be changed. For this reason, it is difficult to flexibly cope with an increase or decrease in the number of power storage cells connected in series.

  The objective of this invention is providing the electrical storage apparatus containing the voltage equalization circuit which can respond flexibly to the increase / decrease in the number of the electrical storage cells connected in series.

According to one aspect of the invention,
A housing that is mounted on the excavator body and includes a bottom surface, a side surface, and a top surface;
A power storage module including a plurality of power storage cells disposed inside the housing;
A support member that includes at least one support wall disposed in a posture perpendicular to the bottom surface of the housing, and is fixed inside the housing;
Provided is a power storage device that includes at least one circuit board that is supported by the support wall and on which an equalization circuit that equalizes a voltage between terminals of the power storage cell is mounted.

Since the circuit board on which the equalization circuit is mounted is supported by the support wall, the dimensions of the circuit board are not restricted by the dimensions of the power storage module. For this reason, a voltage equalization circuit can be arrange | positioned corresponding to increase / decrease in the number of electrical storage cells flexibly.

1A and 1B are perspective views of a lid and a lower housing of a power storage device according to an embodiment, respectively. FIG. 2 is a plan view of the lower casing and components mounted on the lower casing. FIG. 3A is a perspective view of a voltage equalization assembly including a control board, and FIG. 3B is an exploded perspective view of a case and a protection plate of the voltage equalization assembly. FIG. 4A is a plan view of the equalization board, and FIG. 4B is a plan view of the control board. FIG. 5 is a block diagram showing a connection configuration of a plurality of power storage cells, an equalization board, a control board, and a control device connected in series. FIG. 6 is a cross-sectional plan view of a voltage equalizing assembly according to an embodiment. 7 is a cross-sectional view taken along one-dot chain line 7-7 in FIG. FIG. 8 is a side view of the voltage equalization assembly. 9A and 9B are a perspective view and a cross-sectional view, respectively, of a protective plate on which a reinforcing bead is formed, and FIGS. 9C and 9D are a perspective view and a cross-sectional view of the protective plate on which a bent portion is formed. FIG. 10 is a perspective view of a protective plate provided with an opening. FIG. 11 is a perspective view of a case of a voltage equalizing assembly according to another embodiment, and FIG. 11B is a plan sectional view of the voltage equalizing assembly. FIG. 12 is a side view of an excavator on which the power storage device according to the embodiment is mounted. FIG. 13 is a block diagram of an excavator on which the power storage device according to the embodiment is mounted.

  1A and 1B are perspective views of a lid and a lower housing of a power storage device according to the embodiment, respectively. As shown in FIG. 1B, the lower housing 50 includes a bottom surface 51 and a side surface 52, and the upper portion of the lower housing 50 is open. The side surface 52 is disposed over the entire outer peripheral line of the bottom surface 51. The lid 60 shown in FIG. 1A closes the open portion above the lower housing 50. The lower housing 50 and the lid 60 constitute a housing having a bottom surface, a side surface, and an upper surface.

  Two power storage modules 53 are mounted on the bottom surface 51. An xyz orthogonal coordinate system in which a plane parallel to the bottom surface 51 is defined as an xy plane and a normal direction of the bottom surface 51 is defined as a z direction is defined. The direction in which the two power storage modules 53 are separated is defined as the x direction. Each of the power storage modules 53 includes a plurality of power storage cells stacked in the y direction, and charges and discharges electrical energy. The detailed configuration of the power storage module 53 will be described later with reference to FIG.

  A connector box 59 is provided on one side surface 52 perpendicular to the y direction. The space in the connector box 59 and the space in the lower housing 50 are connected to each other through the opening 58. The opening above the connector box 59 is closed with a connector plate on which connector terminals are arranged.

  A first rib 55, a second rib 56, and a third rib 57 for increasing rigidity are formed on the bottom surface 51. The first rib 55 is disposed between the two power storage modules 53 and extends in a direction intersecting the x direction (y direction). One end of the first rib 55 is continuous with the side surface 52 facing the connector box 59.

The second rib 56 is continuous with the first rib 55 at the end of the first rib 55 and extends in the x direction. The first rib 55 is connected to the center of the second rib 56. The third rib 57 extends in the y direction from both ends of the second rib 56 and reaches the side surface 52 where the connector box 59 is provided. The opening 58 is disposed between the locations where the two third ribs 57 are connected to the side surface 52.

  With reference to the bottom surface 51, the first rib 55, the second rib 56, and the third rib 57 are lower than the side surface 52. With the open portion of the lower housing 50 closed with the lid 60, between the first rib 55 and the lid 60, between the second rib 56 and the lid 60, and between the third rib 57 and the lid 60, A gap is formed between the two. A voltage equalization assembly 70 is disposed between the third rib 57 and the side surface 52 parallel to the y direction.

  The bottom surface 51, the side surface 52, the first rib 55, the second rib 56, the third rib 57, and the connector box 59 are integrally formed by a casting method. For example, aluminum is used as the material.

  FIG. 2 shows a plan view of the lower casing 50 and components mounted on the lower casing 50. Two power storage modules 53 are mounted apart in the x direction. The first rib 55 passes between the two power storage modules 53 in the y direction. One end of the first rib 55 is continuous with the side surface 52. The other end of the first rib 55 is located outside the end of the power storage module 53 in the y direction. From this end, the second rib 56 extends in parallel to the x direction and in both directions. The second rib 56 partially overlaps each of the power storage modules 53 in the x direction. From both ends of the second rib 56, the third rib 57 extends in the y direction and reaches the side surface 52 on which the connector box 59 is provided.

  A pair of relay members 62 are arranged in a region surrounded by the second rib 56, the third rib 57, and the connector box 59. A relay circuit 63 is disposed in the connector box 59. The relay circuit 63 is connected to an external electric circuit via the connector 64.

  Each of the power storage modules 53 includes a plurality of plate-shaped power storage cells 10. The plurality of power storage cells 10 are stacked in the thickness direction (y direction). Each of the energy storage cells 10 has a pair of terminals 11 led out in the x direction and in opposite directions. The plurality of power storage cells 10 are connected in series. The terminals 11 at both ends far from the connector box 59 are electrically connected to each other. The pair of terminals 11 may be connected via a fuse. The storage module 53 is charged and discharged through the terminals 11 at both ends of the series circuit of the plurality of storage cells 10.

  The terminals 11 at both ends closer to the connector box 59 are electrically connected to the relay member 62 by bus bars 65, respectively. The bus bar 65 intersects with the second rib 56. The relay member 62 is connected to the relay circuit 63 by the bus bar 66. The bus bar 66 passes through the opening 58 (FIG. 1B).

  A voltage equalizing assembly 70 is mounted between the third rib 57 and the side surface 52 parallel thereto. Each terminal 11 of the storage cell 10 is connected to the voltage equalizing assembly 70 via the cable 33. One voltage equalization assembly 70 is connected to the other voltage equalization assembly 70 via cable 34. Further, one voltage equalizing assembly 70 is connected to an external control device via the cable 35 and the connector 64.

FIG. 3A shows a perspective view of the voltage equalization assembly 70 to which the cable 35 (FIG. 2) is connected. The voltage equalization assembly 70 includes a plurality of circuit boards 15, a case 20 that supports the circuit boards 15, and a protection plate 23. The plurality of circuit boards 15 includes a plurality of equalization boards 13 and a single control board 14.

  A plurality of equalization substrates 13 are stacked in the thickness direction. A plurality of measurement connectors 16 and control connectors 17 are mounted on each of the equalization boards 13. The case 20 is composed of four support walls 21 along the side surface of the regular quadrangular prism, and has rectangular openings at the top and bottom. The four support walls 21 are composed of two support walls 21A perpendicular to the stacking direction and two support walls 21B parallel to the stacking direction. The two upper and lower openings are directed in a direction perpendicular to the stacking direction of the equalization substrate 13. Hereinafter, the stacking direction of the equalization substrates 13 may be simply referred to as “stacking direction”.

  The measurement connector 16 and the control connector 17 are attached at a position accessible through one opening. Specifically, the measurement connector 16 and the control connector 17 are attached in the vicinity of the edge of the equalization substrate 13 that faces the same direction (upward in FIG. 3A) as the direction in which one opening portion faces. . The insertion port of the measurement connector 16 faces upward, and the connector of the cable 33 (FIG. 2) is inserted into the measurement connector 16 from above. The insertion port of the control connector 17 also faces upward, and the connector of the cable 34 (FIG. 2) is inserted into the control connector 17 from above.

  A mounting portion 21C protrudes outward from the upper end of the support wall 21B. Specifically, the attachment portion 21C is formed by bending the upper end of the support wall 21B outward by 90 °.

  Arm portions 24 extend from both side ends of the protective plate 23 toward the case 20. The tip of the arm portion 24 is fixed to the support wall 21 </ b> B of the case 20. Thereby, the protective plate 23 is supported by the case 20. The control board 14 is supported on the protection plate 23. The support walls 21 </ b> A and 21 </ b> B and the protection plate 23 serve as support members that support the circuit board 15.

  FIG. 3B shows an exploded perspective view of the case 20 and the protection plate 23. Case 20 includes a first side member 20A and a second side member 20B. The first side surface member 20A includes one support wall 21A orthogonal to the stacking direction and a pair of support walls 21B parallel to the stacking direction. The second side member 20B is composed of another support wall 21A orthogonal to the stacking direction.

  An overlapping portion 20C is formed by bending both ends of the second side member 20B in the direction of the first side member 20A. The overlapping portion 20C overlaps a part of the support wall 21B of the first side member 20A. The second side member 20B is fixed to the first side member 20A by overlapping the through hole 25 formed in the support wall 21B and the through hole 26 formed in the overlapping portion 20C and tightening with a fastener. Is done.

  One of the through hole 25 and the through hole 26 is an elongated hole that is long in the stacking direction. Thereby, the space | interval of a pair of support wall 21A perpendicular | vertical with respect to the stacking direction can be finely adjusted.

  A plurality of through holes 27 are formed at positions corresponding to each other of the pair of support walls 21A. The through hole 27 is for attaching a support for supporting the equalization substrate 13. A through hole 28 is formed in the attachment portion 21C. The through hole 28 is for attaching the case 20 to the lower housing 50 (FIG. 1).

Through holes 28 are respectively formed at the tips of the arm portions 24 extending from both ends of the protective plate 23. The protective plate 23 is fixed to the case 20 by overlapping the through hole 29 formed in the support wall 21 </ b> B and the through hole 28 formed in the arm portion 24 and tightening with a fastener.

  The dimension in the height direction of one arm part 24 (right arm part in FIG. 3B) is smaller than the dimension in the height direction of the other arm part 24 (left arm part in FIG. 3B). The reason why the dimension in the height direction of the pair of arm portions 24 is different will be described later with reference to FIG.

  FIG. 4A shows a plan view of the equalization substrate 13. A plurality of measurement connectors 16 and one control connector 17 are mounted in the vicinity of the upper edge of the equalization substrate 13. The measurement connector 16 is fitted to the connector 36 of the cable 33. The control connector 17 is fitted to the connector 40 of the cable 34 (FIG. 2). A plurality of voltage equalization circuits 19 are mounted on the equalization substrate 13. The voltage equalization circuit 19 is connected to each terminal of the measurement connector 16 and the control connector 17 via a wiring pattern 37 formed on the equalization substrate 13.

  A plurality of through holes 18 are formed in the equalizing substrate 13. The through hole 18 is arranged at a position corresponding to the through hole 27 of the support wall 21A shown in FIG. 3B.

  FIG. 4B shows a plan view of the control board 14. An internal connection connector 38 is mounted in the vicinity of the upper edge of the control board 14, and an external connection connector 39 is mounted in the vicinity of the side edge. The internal connection connector 38 is fitted to the connector 40 of the cable 34 (FIG. 2). The external connection connector 39 is fitted to the connector 41 of the cable 35 (FIG. 2). A control circuit 42 is mounted on the control board 14.

  FIG. 5 shows a connection configuration of the plurality of power storage cells 10, the equalization substrate 13, the control substrate 14, and the control device 135 connected in series. A plurality of power storage cells 10 are connected in series. A pair of terminals of each storage cell 10 is connected to the equalization substrate 13 by a cable 33. As an example, four voltage equalization circuits 19 are mounted on one equalization substrate 13. The voltage between the terminals of the storage cell 10 is measured by the corresponding voltage equalization circuit 19.

  A control board 14 is connected to each of the equalization boards 13 via cables 34. Further, the control board 14 is connected to a control device 135 of a work machine, for example, an excavator, via a cable 35 and a connector 64 (FIG. 2).

  The voltage equalization circuit 19 measures the voltage between the terminals of the storage cell 10. The measurement result of the voltage between the terminals is input to the control circuit 42 mounted on the control board 14. The control circuit 42 calculates statistical values such as the maximum value, the minimum value, and the average value of the measured values of the inter-terminal voltage of the storage cell 10. The calculated statistical value is input to the control device 135. When receiving an equalization start command from the control device 135, the control circuit 42 sends an equalization start signal to the voltage equalization circuit 19 corresponding to the storage cell 10 having a relatively high voltage. When the voltage equalization circuit 19 receives the equalization start signal from the control circuit 42, the voltage equalization circuit 19 discharges the storage cell 10 via the discharge resistor. Thereby, equalization of the voltage between the terminals of the storage cell 10 is performed.

  FIG. 6 shows a cross-sectional plan view of a voltage equalization assembly 70 according to an embodiment. A plurality of equalization substrates 13 stacked in the thickness direction are accommodated in the case 20. A voltage equalization circuit 19 is mounted on the equalization substrate 13. A support tool 43 fixes the plurality of equalizing substrates 13 in the case 20. The support tool 43 passes from the outer surface of the one support wall 21A through the through hole 27 of the support wall 21A, the through hole 18 of the equalizing substrate 13, and the through hole 27 of the opposing support wall 21A. It reaches the outer surface of 21A.

The support 43 includes male and female spacers 44 disposed between the support wall 21 </ b> A and the equalization substrate 13 and between the two equalization substrates 13 adjacent to each other. The equalizing substrate 13 is fixed to the case 20 by a male / female spacer 44 and bolts 45 and nuts 46 attached to both ends.

  A fastener 48 passes through the through hole 25 of the support wall 21B parallel to the stacking direction and the through hole 26 of the overlapping portion 20C, so that the first side member 20A and the second side member 20B are mutually connected. Fix it.

  The protection plate 23 is disposed at a distance from the one support wall 21A. Arms 24 extending from both ends of the protective plate 23 toward the case 20 are fixed to the support wall 21 </ b> B by fasteners 49. The control board 14 is disposed between the protective plate 23 and the support wall 21A. The control board 14 is fixed to the protective plate 23 by a support 72. The support tool 72 includes a male-female spacer, a bolt, and a nut.

  The control board 14 is supported by the case 20 via the protective plate 23. The protection plate 23 has a function of supporting the control board 14 and a function of protecting the control board 14. The control board 14 may be fixed to the support wall 21 </ b> A of the case 20. In this case, the protection plate 23 does not have a function of supporting the control board 14 but has only a function of protecting the control board 14.

  FIG. 7 is a cross-sectional view taken along one-dot chain line 7-7 in FIG. A third rib 57 rises upward from the bottom surface 51 of the lower housing 50. A step 83 is formed on the inner surface of the side surface 52. The step 83 is arranged at the same height as the upper end of the third rib 57. A voltage equalizing assembly 70 is disposed between the third rib 57 and the side surface 52.

  The equalization substrate 13 is supported between the two support walls 21 </ b> B of the voltage equalization assembly 70. The voltage equalizing assembly 70 is disposed in the lower housing 50 in such a posture that the insertion ports of the measurement connector 16 and the control connector 17 face upward. Two attachment portions 21 </ b> C of the voltage equalization assembly 70 are supported by the step 83 and the upper surface of the third rib 57, respectively. The case 20 (FIGS. 3A and 3B) is fixed to the lower housing 50 by a fastener 85 (for example, a bolt) that passes through the through hole 28 (FIGS. 3A and 3B) formed in the attachment portion 21 </ b> C. The equalization substrate 13 is perpendicular to the stacking direction (y direction) of the storage cells 10. A gap is secured between the case 20 including the support wall 21 </ b> B and the bottom surface 51 of the lower housing 50.

  Since the insertion ports of the measurement connectors 16 and the control connectors 17 of all the equalization boards 13 face upward, the connector 36 and the cable 33 of the cable 33 are connected with the voltage equalization assembly 70 fixed to the lower housing 50. 34 connectors 40 can be easily inserted into the measurement connector 16 and the control connector 17, respectively. Thereby, the maintenance property is improved.

  Furthermore, as shown in FIG. 3A, the attachment portion 21 </ b> C is provided at the edge of the opening above the case 20. When a mounting portion is provided at the edge of the lower opening and the case 20 is screwed to the bottom surface 51 of the lower housing 50, a screwdriver is inserted while avoiding the components housed in the lower housing 50, and the screw I have to stop it. For this reason, workability | operativity is bad. On the other hand, in the embodiment, since the attachment portion 21C is provided at the upper end of the support wall 21B, workability when attaching the case 20 (FIGS. 3A and 3B) to the lower housing 50 can be improved. .

  A side view of the voltage equalization assembly 70 is shown in FIG. A plurality of equalization substrates 13 are accommodated in the case 20. A protective plate 23 is disposed at a distance from one support wall 21 </ b> A of the case 20. The control board 14 is accommodated between the protective plate 23 and the support wall 21A. Since the control board 14 is larger than the equalization board 13, it is difficult to accommodate the control board 14 in the case 20. For this reason, the control board 14 is disposed outside the case 20.

  A measurement connector 16 (FIG. 4A) and a control connector 17 are mounted in the vicinity of the upper end of the equalization substrate 13. In FIG. 8, the description of the measurement connector 16 is omitted, and only the control connector 17 is shown. An internal connector 38 is mounted in the vicinity of the upper end of the control board 14. The cable 34 connects the plurality of control connectors 17 and the internal connection connectors 38 in order. Physically, a plurality of equalization boards 13 and one control board 14 are connected in a bus shape by a cable 34, but electrically, as shown in FIG. A plurality of voltage equalization circuits 19 are star-connected.

  An external connection connector 39 is mounted on the side edge of the control board 14 (the front edge in FIG. 8). The cable 35 (FIG. 2) is connected to the external connection connector 39. The cable 35 extends in a lateral direction (a direction perpendicular to the paper surface in FIG. 8) from the front edge of the control board 14. The height direction dimension of the arm portion 24 (the front arm portion 24 in FIG. 8) corresponding to the edge on which the external connection connector 39 is mounted is that of the arm portion 24 on the opposite side (the back side in FIG. 8). It is smaller than the height dimension. In order to prevent the cable 35 from spatially interfering with the front arm 24, the external connection connector 39 is arranged at a position different from the front arm 24 in the height direction. Thereby, the cable 35 is connected to the external connection connector 39 while avoiding the arm portion 24.

  In FIG. 8, since the dimension in the height direction of the arm portion 24 on the near side is relatively small, spatial interference between the cable 35 and the arm portion 24 can be easily avoided. Moreover, since the dimension of the other arm part 24 in the height direction is relatively large, the support strength of the protection plate 23 can be increased.

  The arm portion 24 includes a widened portion 24 </ b> A whose dimension in the height direction increases in the vicinity of the connecting portion with the protective plate 23 as it approaches the connecting portion. The upper and lower edges of the widened portion 24A have, for example, an arc shape. By providing the widened portion 24A, stress concentration can be reduced.

  When the equalization substrate 13 and the control substrate 14 are arranged in parallel to the bottom surface 51 of the lower housing 50 (FIG. 1B) and are stacked at regular intervals, the stacked structure is formed only at the lower end and the lower housing 50 is stacked. Fixed to. Since the upper end of the stacked structure is a free end, the equalization board 13 and the control board 14 are easily affected by the vibration of the casing. In the embodiment, as shown in FIG. 6, both ends of the stacked structure of the equalization substrates 13 are fixed to the support walls 21A, respectively. Thereby, since the rigidity of a stacked structure increases, vibration resistance can be improved.

  When the number of storage cells 10 (FIG. 2) increases or decreases, the number of equalization substrates 13 included in the voltage equalization assembly 70 may be adjusted. For this reason, it is possible to flexibly cope with an increase or decrease in the number of power storage cells 10.

  As shown in FIG. 9A, reinforcing beads 90 may be provided on the protective plate 23 and the arm portion 24. FIG. 9B shows a longitudinal sectional view of the protective plate 23. The reinforcing bead 90 passes, for example, from one arm portion 24 through the protective plate 23 in the lateral direction and reaches the other arm portion 24. By providing the reinforcing bead 90, the rigidity of the protective plate 23 can be increased.

  As shown in FIG. 9C, the outer periphery of the protective plate 23 and the arm portion 24 may be bent at a substantially right angle to provide a folded portion 91. FIG. 9D shows a longitudinal sectional view of the protective plate 23. Folded portions 91 are formed at the upper and lower ends of the protective plate 23. Furthermore, as shown in FIG. 9C, folding portions 91 are also provided on the side edges of the protection plate 23 and the edges of the arm portions. By providing the folding part 91, the rigidity of the protective plate 23 can be increased.

  As shown in FIG. 10, the protective plate 23 may be provided with a plurality of openings 92. By providing the opening 92, the protective plate 23 can be reduced in weight. By reducing the weight of the protective plate 23, the resonance frequency of the protective plate 23 can be increased.

  Another embodiment will be described with reference to FIGS. 11A and 11B. Hereinafter, in the embodiment shown in FIGS. 11A and 11B, the configuration of the voltage equalizing assembly 70 is different from the embodiment shown in FIGS. 1 to 8, and other configurations are shown in FIGS. It is the same as the embodiment.

  FIG. 11A shows a perspective view of the case 20 of the voltage equalization assembly 70. The case 20 according to this embodiment has substantially the same configuration as the first side member 20A shown in FIG. 3B. That is, the case 20 includes one support wall 21A, two support walls 21B that are continuous to both ends thereof, and a mounting portion 21C that is provided at the upper end of the support wall 21B. The through holes 25 and 29 shown in FIG. 3B are not formed in the support wall 21B.

  FIG. 11B shows a cross-sectional plan view of the voltage equalization assembly 70. A plurality of equalization boards 13 and a control board 14 are fixed to the support wall 21 </ b> A by a support tool 43. Similar to the support tool 43 shown in FIG. 6, the support tool 43 includes a male-female spacer 44, a bolt 45, and a nut 46. In the embodiment shown in FIG. 6, the control board 14 is attached to the protective plate 23, but in the embodiment shown in FIG. 11B, the control board 14 is also fixed to the support wall 21 </ b> A by the support tool 43.

  As in the embodiment shown in FIGS. 11A and 11B, only one support wall 21A may be provided. Also in this embodiment, workability when attaching the case 20 to the lower housing 50 can be improved as in the embodiments shown in FIGS.

  With reference to FIG.12 and FIG.13, the shovel in which the electrical storage apparatus by an Example is mounted is demonstrated.

  FIG. 12 shows a side view of an excavator equipped with the power storage device according to the embodiment. An upper swing body 101 is mounted on the lower traveling body 100. A boom 103, an arm 105, and a bucket 107 are connected to the upper swing body 101. As the boom cylinder 104 expands and contracts, the posture of the boom 103 changes. 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 swivel motor 102, an engine 110, a motor generator 111, and a power storage device 115 are mounted on an excavator body, specifically, an upper swing body 101.

  FIG. 13 shows a block diagram of the excavator. In FIG. 13, 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 two left and right crawlers provided in the lower traveling body 100 (FIG. 12), respectively.

  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. 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. Switching between the assist operation and the power generation operation of the motor generator 111 is performed by the inverter 113A.

  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. Thereby, power storage device 115 in power storage circuit 112 is charged. As the power storage device 115 in the power storage circuit 112, the power storage device according to the above embodiment is used.

  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. 12) 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 of the resolver 132 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 turning electric motor 102, the boom 103, the arm 105, and the bucket 107 (FIG. 12).

  The upper swing body 101 of the work machine is more likely to vibrate during work and travel compared to a general transport vehicle. For this reason, the power storage device 115 mounted on the upper swing body 101 also vibrates and receives an impact. In the embodiment, since the vibration resistance of the voltage equalizing assembly 70 can be enhanced, high reliability of the power storage device can be ensured against vibration and shock.

  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 Storage cell 11 Terminal 13 Equalization board | substrate 14 Control board 15 Circuit board 16 Measurement connector 17 Control connector 18 Through-hole 19 Voltage equalization circuit 20 Case 20A 1st side member 20B 2nd side member 20C Overlapping part 21 , 21A, 21B Support wall 21C Mounting portion 23 Protection plate 24 Arm portion 24A Widened portion 25, 26, 27, 28, 29 Through hole 33, 34, 35 Cable 36 Connector 37 Wiring pattern 38 Internal connection connector 39 External connection connector 40, 41 Connector 42 Control circuit 43 Support tool 44 Male female spacer 45 Bolt 46 Nut 48, 49 Fastener 50 Lower housing 51 Bottom surface 52 Side surface 53 Power storage module 55 First rib 56 Second rib 57 Third rib 58 Opening 59 Connector box 60 Lid 62 Relay member 63 Relay circuit 64 Connectors 65 and 66 Bus bar 70 Voltage equalization assembly 72 Support tool 83 Step 85 Fastening tool 90 Reinforcement bead 91 Folding part 92 Opening part 100 Lower traveling body 101 Upper turning body 102 Turning electric motor 103 Boom 104 Boom cylinder 105 Arm 106 Arm cylinder 107 Bucket 108 Bucket cylinder 109A Hydraulic motor 109B Hydraulic motor 110 Engine 111 Motor generator 112 Power storage circuit 113A Inverter 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 Hydraulic line 130 Hydraulic line 131 Reducer 132 Resolver 133 Mechanical brake 135 Control device

Claims (12)

A housing that is mounted on the excavator body and includes a bottom surface, a side surface, and a top surface;
A power storage module including a plurality of power storage cells disposed inside the housing;
A support member that includes at least one support wall disposed in a posture perpendicular to the bottom surface of the housing, and is fixed inside the housing;
A power storage device having at least one circuit board mounted on an equalization circuit that is supported by the support wall and that equalizes a voltage between terminals of the power storage cell.   The power storage device according to claim 1, wherein a plurality of the circuit boards are supported on the support wall.   The power storage device according to claim 1, wherein a gap is secured between the support member and a bottom surface of the housing.   The power storage device according to any one of claims 1 to 3, wherein a plurality of the support walls are disposed so as to sandwich the circuit board.   The power storage device according to claim 1, wherein the support member includes a case having at least an upper portion opened, and a side surface of the case is configured by the support wall. The circuit board is
An equalization substrate for mounting the equalization circuit configured corresponding to the storage cell;
A control circuit for controlling the equalization circuit is mounted, and includes a control board larger than the equalization board,
The power storage device according to claim 5, wherein the equalization board is housed inside the case, and the control board is disposed outside the case. The support member includes a protective plate disposed at a distance from the support wall and fixed to the case;
The power storage device according to claim 6, wherein the control board is disposed between the support wall and the protection plate.   The power storage device according to claim 7, wherein the control board is fixed to the protection plate and supported by the case via the protection plate.   The power storage device according to claim 7, further comprising arm portions extending toward the case from both lateral ends of the protection plate, wherein the tip ends of the arm portions are fixed to side surfaces of the case. apparatus. The height direction dimension of the arm portion extending from one first end of the protection plate is smaller than the height direction dimension of the arm portion extending from the other second end,
A first cable that connects the control board to a device outside the housing is connected to the control board,
The power storage device according to claim 9, wherein the first cable extends in a lateral direction from the first end of the control board and is connected to the control board at a position avoiding the arm portion.   11. The power storage device according to claim 9, wherein the arm portion includes a widened portion in which a dimension in a height direction increases as approaching the connection portion in a connection portion with the protection plate.   And a second cable for connecting the equalization board and the control board, wherein the second cable is drawn upward from the control board and the equalization board and above the support wall. The power storage device according to claim 6, wherein the power storage device passes through.

Images