JP5484301B2 - Power storage module and work machine - Google Patents

Description

  The present invention relates to a power storage module and a work machine in which a plurality of power storage cells are arranged and a heat transfer plate for cooling is brought into contact with the power storage cells.

  Development of electrically driven work machines using storage cells such as rechargeable secondary batteries and capacitors is in progress. In order to secure a desired operating voltage, a plurality of power storage cells are connected in series. A heat transfer plate for transferring the heat generated in the storage cell to the outside contacts the plurality of storage cells.

Japanese Patent Application Laid-Open No. 8-111244 JP 2001-11889 A

  When assembling the power storage module, it is necessary to position and fix the plurality of power storage cells and the heat transfer plate. As the number of power storage cells and heat transfer plates increases, the assembly work becomes complicated.

  The objective of this invention is providing the electrical storage module which can be assembled easily even if the number of electrical storage cells increases.

According to one aspect of the invention,
A plurality of storage cells;
A heat transfer plate disposed between the storage cells and in contact with the storage cells on both sides;
The heat transfer plate have a first position restraining structure for inhibiting movement of the storage cells to one direction parallel to the surface of the heat transfer plate,
At least three power storage cells are arranged, and the heat transfer plate includes a plurality of inter-cell portions disposed between the power storage cells and a curved curved portion that connects the inter-cell portions. The inter-cell portion and the curved portion are formed by folding a single plate, and the vertical projection image on the first virtual plane is in a zigzag shape,
The first position constraint structure is provided with a power storage module that prohibits movement of the power storage cell in a direction perpendicular to the first virtual plane .

  Since the first position restraining structure restrains the position of the storage cell, assembly can be easily performed.

(1A) is a plan cross-sectional view of the power storage module according to Example 1, and (1B) is a cross-sectional view taken along one-dot chain line 1B-1B of (1A). 1 is a cross-sectional view of a power storage module according to Example 1. FIG. It is a perspective view before folding of the heat exchanger plate used for the electrical storage module by Example 1. FIG. (4A) and (4B) are cross-sectional views of a heat transfer plate used in a power storage module according to a modification of the first embodiment. 6 is a cross-sectional view of a heat transfer plate used in a power storage module according to Example 2. FIG. 6 is a cross-sectional view of a power storage module according to Example 3. FIG. (7A) is a perspective view of a heat transfer plate used for the power storage module according to the third embodiment, and (7B) is a perspective view of a heat transfer plate used for the power storage module according to a modification of the third embodiment. (8A) is a top view of the electrical storage module by Example 4, (8B) is sectional drawing in the dashed-dotted line 8B-8B of (8A). FIG. 10 is a plan view of a power storage module according to a modification of Example 4. It is the schematic of the hybrid type working machine carrying the electrical storage module by Examples 1-4.

[Example 1]
FIG. 1A shows a cross-sectional plan view of a power storage module according to the first embodiment. In order to facilitate understanding, an xyz Cartesian coordinate system is defined. A plurality of (at least four) storage cells 20 in the form of a plate are arranged in the thickness direction (z-axis direction). Each of the storage cells 20 can store electric energy and release the stored electric energy. For example, an electric double layer capacitor in which a collector electrode, a separator, an electrolytic solution, and the like are sealed with a laminate film is used for the storage cell 20. A lithium ion capacitor sealed with a laminate film, a lithium ion secondary battery, or the like can also be used.

  A heat transfer plate 21 folded in a zigzag shape (serpentine shape) is in contact with the storage cell 20. The heat transfer plate 21 has a flat inter-cell portion 21A disposed between the storage cells 20 and a curved portion 21B connecting the inter-cell portions 21A, and both are alternately arranged. The inter-cell part 21A is thermally coupled to the storage cells 20 on both sides. However, the outermost inter-cell portion 21A is in contact with the storage cell 20 only on the inner surface, and the storage cell 20 is not disposed on the outside. The heat transfer plate 21 is arranged in a posture in which a vertical projection image on the yz plane is folded in a line of sight when viewed with a line of sight parallel to the x axis.

  A flow path 22 through which a cooling medium flows is formed inside the heat transfer plate 21. The flow path 22 is meandering from one end to the other end in the z-axis direction in alignment with the zigzag shape of the heat transfer plate 21.

  A flow path 22 is open at both end faces of the heat transfer plate 21. A cooling medium introduction pipe 24 and a cooling medium discharge pipe 25 are connected to the end face where the flow path 22 is opened. The cooling medium introduction pipe 24 and the cooling medium discharge pipe 25 are brazed to the heat transfer plate 21, for example.

  A cooling medium such as cooling water, oil, chlorofluorocarbon, ammonia, hydrocarbons, air, or the like is introduced from the cooling medium supply unit 26 into the cooling medium introduction pipe 24. The cooling medium introduced into the cooling medium introduction pipe 24 is transported to the cooling medium discharge pipe 25 via the flow path 22 in the heat transfer plate 21. The cooling medium transported to the cooling medium discharge pipe 25 is collected by the cooling medium supply device 26. The cooling medium supply device 26 includes, for example, a pump and a radiator.

  The pair of end plates 31 and 34 and the pair of side plates 32 and 33 constitute four wall surfaces among the six wall surfaces of the parallelepiped structure. One end plate 31 and the pair of side plates 32 and 33 are formed by bending a single plate. The end plates 31 and 34 are disposed at both ends of the storage cell 20 in the arrangement direction. Spacers 27 are disposed between one end plate 31 and the inter-cell portion 21A and between the other end plate 34 and the inter-cell portion 21A. For the spacer 27, for example, aluminum, copper or the like is used.

  One end plate 34 is fixed to the side plates 32 and 33 with a fastener 37 made of bolts and nuts. The fastener 37 applies a compressive force in the arrangement direction (z-axis direction) to the stacked body in which the storage cell 20 and the inter-cell portion 21A are stacked. That is, the end plates 31 and 34, the side plates 32 and 33, and the fastener 37 serve as a pressurizing mechanism that applies a compressive force to the laminate.

  FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A. A cross-sectional view taken along one-dot chain line 1A-1A in FIG. 1B corresponds to FIG. 1A. The storage cells 20 and the inter-cell portions 21A of the heat transfer plates 21 are alternately stacked. A plurality of flow paths 22 are formed inside the heat transfer plate 21A. In FIG. 1B, the cooling medium is transported in a direction perpendicular to the paper surface. The plurality of flow paths 22 are separated from each other by a partition wall. Since the partition walls are formed, when a compressive force in the thickness direction is applied to the inter-cell portion 21A, the inter-cell portion 21A is not crushed and the shape is maintained.

  The bottom plate 35 and the top plate 36 together with the side plates 32 and 33 (FIG. 1A) and the end plates 31 and 34 form a parallelepiped housing. The inter-cell portion 21A is in contact with the bottom plate 35 at the lower end surface (end surface facing the negative direction of the x-axis). A gap is secured between the top plate 36 and the inter-cell portion 21A. A plurality of power storage cells 20 are connected in series by wiring 38 passing through the gap. The wiring 38 includes an electrode attached to one power storage cell 20 and an electrode attached to the other power storage cell 20. The electrode of one electrical storage cell 20 and the electrode of the other electrical storage cell 20 are electrically connected by ultrasonic welding. For example, an aluminum plate is used as the electrode.

  A part of the lower end and a part of the upper end of the heat transfer plate 21 are thicker than the inner back part. A step (position restricting structure) 23 appears at the boundary between the relatively thin portion at the inner back and the relatively thick portion at the end. During the manufacturing process, when the storage cell 20 is inserted between the inter-cell portions 21 </ b> A, the edge of the storage cell 20 contacts the step 23, thereby prohibiting the movement of the storage cell 20 in the x-axis direction.

  FIG. 2 is a cross-sectional view taken along one-dot chain line 2-2 in FIGS. 1A and 1B. 2 corresponds to FIG. 1A, and the cross-sectional view along the alternate long and short dash line 1B-1B corresponds to FIG. 1B.

  A bottom plate 35 is fixed to the side plates 32 and 33 by a fastener 40 composed of bolts and nuts. A top plate 36 is fixed to the side plates 32 and 33 by a fastener 41 made of bolts and nuts. A flow path 22 is formed inside the heat transfer plate 21. Two compressive force transmission members 39 are arranged in the gap between the heat transfer plate 21 and the top plate 36. An electrode tab 38 serving as a positive electrode and a negative electrode is led out from one storage cell 20 in the positive direction of the x axis. By connecting the electrode tabs 38 of adjacent storage cells 20 to each other, the storage cells 20 are connected in series. The electrode tab 38 passes through the gap between the heat transfer plate 21 and the top plate 36.

  Each of the compressive force transmitting members 39 is, for example, a rod-shaped member having an L-shaped cross section, and extends in the arrangement direction (z-axis direction) of the storage cells 20. The compressive force transmission member 39 is fixed to the top plate 36 by welding or the like and is in contact with the heat transfer plate 21. The fasteners 40 and 41 apply a compressive force in a direction perpendicular to the bottom plate 35 (x-axis direction) to the heat transfer plate 21 via the compressive force transmitting member 39.

  With this compressive force, the position of the heat transfer plate 21 in the direction (x-axis direction and y-axis direction) orthogonal to the arrangement direction of the storage cells 20 is constrained in the housing. The heat transfer plate 21 whose position is restricted functions as a reinforcing rib that increases the mechanical strength of the housing.

  The thickness of the spacer 27 is set to be equal to or higher than the height of the step 23. For this reason, the compressive force from the end plates 31 and 34 can be effectively transmitted to the inter-cell portion 21 </ b> A via the spacer 27.

  FIG. 3 shows a perspective view of the heat transfer plate 21 before folding. The heat transfer plate 21 is a rectangular plate-like member, and a plurality of flow paths 22 extending in the length direction are formed therein. Each of the flow paths 22 reaches from one end face orthogonal to the length direction of the heat transfer plate 21 to the opposite end face. Further, a step 23 extending in the length direction is formed on both surfaces of the heat transfer plate 21. For the heat transfer plate 21, for example, a metal such as aluminum is used. Since the cross-sectional shape is the same at any position in the length direction of the heat insulating plate 21, the heat transfer plate 21 can be easily manufactured by extrusion molding. For this reason, a cooling function can be introduced into the power storage module at low cost. By inserting the storage cell 20 between the inter-cell portions 21A of the heat transfer plate 21 folded in a zigzag shape, a stacked body of the storage cell 20 is obtained.

  Next, the effect of the step 23 provided on the heat transfer plate 21 will be described. If the position of the storage cell 20 in the x-axis direction varies during assembly, the wiring 38 abnormally approaches the heat transfer plate 21 and the top plate 36. Since the step 23 restrains the position of the storage cell 20 in the x-axis direction at the time of assembly, this abnormal approach can be avoided. Since the step 23 serves as a guide in the x-axis direction of the storage cell 20, assembly work can be easily performed.

  If the electrode tabs 38 of the power storage cell 20 are connected before inserting the power storage cell 20 between the inter-cell portions 21A, the position of the power storage cell 20 does not vary in the y-axis direction. For this reason, even when the heat transfer plate 21 is not provided with a position restraining structure in the y-axis direction, there is no inconvenience during assembly.

  If the electrode tabs 38 are not connected before the storage cell 20 is inserted between the inter-cell portions 21A, the position of the storage cell 20 in the y-axis direction cannot be constrained. However, it is easy to position the storage cell 20 so as not to protrude from the heat transfer plate 21 in the y-axis direction. Therefore, even if the displacement of the storage cell 20 in the y-axis direction occurs, the amount of displacement is based on the difference between the dimension of the heat transfer plate 21 in the y-axis direction and the dimension of the storage cell 20 in the y-axis direction. Will not grow. The dimension of the electrode tab 38 in the y-axis direction is sufficiently larger than the maximum displacement amount of the storage cell 20. For this reason, even if the position of the storage cell 20 in the y-axis direction varies, there is no problem in connecting the electrode tabs 38 to each other.

  FIG. 4A shows a cross-sectional view of the heat transfer plate 21 according to a modification of the first embodiment together with the storage cell 20. In Example 1, as shown in FIG. 1B, steps 23 are formed on both surfaces of both the lower end and the upper end of the heat transfer plate 21. In the modification shown in FIG. 4A, a step 23a is formed only on one first surface 28a near the lower end of the heat transfer plate 21 (the end facing the negative direction of the x-axis), and the upper end ( In the vicinity of the end portion facing the positive direction of the x-axis), a step 23b is formed only on the second surface 28b opposite to the first surface 28a.

  The storage cell 20a sandwiched between the first surfaces 28a in a state where the heat transfer plate 21 is folded is prohibited from moving in the negative direction of the x-axis by the step 23a. At the time of assembly, the position of the storage cell 20a in the x-axis direction can be restrained by bringing the edge of the storage cell 20a into contact with the step 23a. In addition, the storage cell 20b sandwiched between the second surfaces 28b is prohibited from moving in the positive direction of the x axis by the step 23b. At the time of assembly, the position of the storage cell 20b in the x-axis direction can be constrained by bringing the edge of the storage cell 20b into contact with the step 23b.

  When a compressive force in the stacking direction (z-axis direction) is applied after assembly, the position of the storage cell 20 is fixed by the frictional force generated on the mutual contact surface between the heat transfer plate 21 and the storage cell 20. For this reason, the storage cell 20a does not shift in the positive direction of the x axis, and the storage cell 20b does not shift in the negative direction of the x axis.

  The heat transfer plate 21 of the modification shown in FIG. 4A has lower rigidity than the heat transfer plate 21 of the first embodiment shown in FIG. 1B. For this reason, the heat transfer plate 21 can be easily folded in a zigzag shape.

  FIG. 4B shows a cross-sectional view of the heat transfer plate 21 according to another modification of the first embodiment together with the storage cell 20. In this modification, the step 23 is formed only in the vicinity of the upper end (end portion facing the positive direction of the x-axis) of the heat transfer plate 21 and in the vicinity of the lower end (end portion facing the negative direction of the x-axis). No step is formed. Steps 28 near the upper end are formed on both surfaces of the heat transfer plate 21.

  At the time of assembly, the movement of the storage cell 20 in the positive direction of the x axis is prohibited, so that the position of the storage cell 20 is constrained. Also in this modification, the rigidity of the heat transfer plate 21 is lower than the rigidity of the heat transfer plate 21 of the first embodiment. For this reason, the heat transfer plate 21 can be easily folded in a zigzag shape.

[Example 2]
In FIG. 5, the plane sectional view of the heat-transfer plate and electrical storage cell of the electrical storage module by Example 2 is shown. In the following description, the difference from the power storage module according to the first embodiment shown in FIGS. 1A to 3 will be noted, and the description of the same configuration will be omitted. The inter-cell portion 21A of the heat transfer plate 21 and the storage cell 20 are stacked in the z-axis direction.

  The curved portion 21B includes a raised portion 21C that rises with reference to the outer surface of the pair of inter-cell portions 21A that are continuous to the curved portion 21B. In any power storage cell 20, a rising portion 21 </ b> C is provided in one of the positive direction and the negative direction of the y-axis. The storage cell 20 is prohibited from moving in the direction toward the rising portion 21C (positive or negative direction of the y-axis) by the rising portion 21C. That is, the rising portion 21 </ b> C functions as a position restraining structure that restrains the position of the storage cell 20.

  Regarding the x-axis direction, as in the first embodiment, the step 23 (FIG. 1B) restrains the position of the storage cell 20. In Example 1, the position of the storage cell 20 could be constrained only in the x-axis direction at the time of assembly, but in Example 2, the position of the storage cell 20 can also be constrained in the y-axis direction. .

[Example 3]
FIG. 6A shows a cross-sectional view of a power storage module according to the third embodiment. In order to facilitate understanding, an xyz Cartesian coordinate system is defined.

  A plurality of power storage cells 20 and a plurality of heat transfer plates 21 are alternately stacked in the z-axis direction. The heat transfer plate 21 (FIG. 1A) employed in the first embodiment is a single plate folded, but in the third embodiment, the individual heat transfer plates 21 are sandwiched between the storage cells 20. ing. Electrode tabs 38 are led out from the lower end (end portion facing the negative direction of the x-axis) and the upper end (end portion facing the positive direction of the x-axis), respectively. The electrode tabs 38 of adjacent storage cells 20 are connected so that the storage cells 20 are connected in series.

  End plates 31 and 34 are arranged at both ends in the stacking direction (z-axis direction) of the stacked body including the storage cell 20 and the heat transfer plate 21. A plurality of tie rods 50 penetrate from one end plate 31 to the other end plate 34 to apply a compressive force in the z-axis direction to the storage cell 20 and the heat transfer plate 21. A bottom plate 35 and a top plate 36 are fixed to the end plates 31 and 34 with bolts.

  Each heat transfer plate 21 has a lower end (an end portion facing the negative direction of the x-axis) and an upper end (an end portion facing the positive direction of the x-axis) that are thicker than the inner back portion. A step 23 is formed at the boundary between the relatively thick portion and the relatively thin portion. The step 23 extends in a direction parallel to the y-axis. When the edge of the storage cell 20 contacts the step 23, the position of the storage cell 20 in the x-axis direction is constrained.

  6B is a cross-sectional view taken along one-dot chain line 6B-6B in FIG. 6A. Side plates 32 and 33 are arranged on both sides of the laminate composed of the storage cell 20 and the heat transfer plate 21. The side plates 32 and 33 are fixed to the bottom plate 35 and the top plate 36 with bolts. The heat transfer plate 21 is in contact with the side plates 32 and 33 at its end face. A flow path 52 for flowing a cooling medium is formed in the side plates 32 and 33.

  The heat generated in the storage cell 20 is transferred to the side plates 32 and 33 via the heat transfer plate 21. The side plates 32 and 33 are cooled by the cooling medium flowing through the flow path 52.

  FIG. 7A shows a perspective view of the heat transfer plate 21. Steps 23 extending in the y-axis direction are formed on both surfaces near the lower end and near the upper end of the heat transfer plate 21. Similarly to the example shown in FIG. 4A, the step 23 near the lower end may be formed only on one surface of the heat transfer plate 21, and the step 23 near the upper end may be formed only on the other surface of the heat transfer plate 21. Good. Further, similarly to the example shown in FIG. 4B, the step 23 may be formed only in the vicinity of the upper end. Conversely, the step 23 may be formed only in the vicinity of the lower end.

  In the third embodiment, the relative positions of the power storage cell 20 and the heat transfer plate 21 in the x-axis direction are restricted. For this reason, the electrical storage cell 20 and the heat transfer plate 21 can be easily stacked while being positioned.

  FIG. 7B is a perspective view of the heat transfer plate 21 applied to the power storage module according to the modification of the third embodiment. In this modification, a step 23y is also formed in the vicinity of the side end of the heat transfer plate 21 (the end facing the negative direction of the y-axis). The step 23y extends in a direction parallel to the x axis. The step 23 extending in the direction parallel to the y-axis is formed only in the vicinity of the lower end of the heat transfer plate 21.

  The step 23y restrains the position of the storage cell 20 in the y-axis direction. For this reason, the electrical storage cell 20 and the heat transfer plate 21 can be easily stacked while being positioned.

[Example 4]
FIG. 8A shows a plan view of a power storage module according to the fourth embodiment. In order to facilitate understanding, an xyz Cartesian coordinate system is defined.

  A plurality of power storage cells 20 are arranged in the z-axis direction. Each outer shape of the storage cell 20 is, for example, a cylindrical shape having a central axis parallel to the x axis. The electricity storage cell 20 is a cell in which a laminated film in which a collector electrode, a polarizable electrode, a separator and the like are laminated is wound and loaded in a cylindrical can. The heat transfer plate 21 passes so as to sew between the storage cells 20. For example, in the odd-numbered storage cell 20, half of the side surface of the cylinder facing the positive direction of the y-axis is in contact with the heat transfer plate 21, and in the even-numbered storage cell 20, the negative of the y-axis Half of the region facing the direction of is in contact with the heat transfer plate 21.

  A positive electrode and a negative electrode are provided on the upper surface of the storage cell 20. The plurality of power storage cells 20 are connected in series by a wiring 38. Two compressive force transmission members 39 pass above the storage cell 20.

  FIG. 8B is a cross-sectional view taken along one-dot chain line 8B-8B in FIG. 8A. On the bottom plate (pedestal) 35, the storage cell 20 and the heat transfer plate 21 are placed. A flow path 22 for flowing a cooling medium is formed in the heat transfer plate 21. The vicinity of the upper end (the end portion facing the positive direction of the x-axis) of the heat transfer plate 21 is made thicker than the other regions. A step 23 is formed at the boundary between the relatively thick portion and the relatively thin portion. The compressive force transmission member 39 applies a compressive force in the x-axis direction to the heat transfer plate 21. The compressive force is applied by, for example, the top plate 36, the side plates 32 and 33, the fastener 41, and the like shown in FIG.

  When the step 23 contacts the edge of the upper surface of the storage cell 20, the storage cell 20 is pressed against the bottom plate 35 and fixed. For this reason, as compared with the case where the storage cells 20 are individually fixed to the bottom plate 35, the assembling work is facilitated.

  In FIG. 9, the top view of the electrical storage module by the modification of Example 4 is shown. In the fourth embodiment shown in FIG. 8A, the central axes of the storage cells 20 are aligned on a straight line. However, in the modification shown in FIG. 9, the odd-numbered storage cells 20a are aligned on a straight line, The cells 20b are also arranged in a straight line, but both are arranged at positions shifted in the y-axis direction. For example, the odd-numbered power storage cell 20a is shifted in the positive direction of the y-axis from the even-numbered power storage cell 20b.

  The heat transfer plate 21 passes through the positive side of the y-axis of the odd-numbered storage cell 20a and passes through the negative side of the y-axis of the even-numbered storage cell 20b. The heat transfer plate 21 contacts the side surface of the storage cell 20 in a region corresponding to an arc having a central angle larger than 180 °. For this reason, the position in the yz plane of the electrical storage cell 20 is more firmly fixed by the heat transfer plate 21.

[Example 5]
FIG. 10 is a schematic plan view of a hybrid excavator as an example of a work machine on which at least one of the power storage modules according to the first to fourth embodiments 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.

  As the power storage module 80, the power storage modules according to the first to fourth embodiments are used. The turning electric motor 76 is driven by the electric power supplied from the power storage module 80. The turning electric motor 76 turns the turning body 70 to be driven. 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.

  The traveling device 71 includes, for example, a pair of crawlers, and moves the revolving body 70 forward or backward. The crawler may be driven by a hydraulic motor or may be driven by an electric motor. Electric power is supplied from the power storage module 80 to the electric motor that drives the crawler.

  In particular, work machines often travel on gravel roads with poor road surfaces, compared to automobiles, and frequently collide with surrounding deposits and structures during work. For this reason, a large vibration and a strong impact are easily applied to the power storage module mounted on the work machine. There is concern about the displacement of the power storage module due to this vibration or impact. In the said Example, since the electrical storage cell is supported by the heat exchanger plate provided with a position constraint structure, even if a big vibration and a strong impact are added, the position shift of a some electrical storage cell does not arise easily. Thereby, the connection state of the electrode tab 38 can be stabilized.

  In FIG. 10, a hybrid excavator is shown as an application example to a work machine. However, in addition to the hybrid excavator, the power storage modules according to the first to fourth embodiments are other operations such as an electric excavator, a wheel loader, a bulldozer, a forklift It can also be applied to machines. When the power storage module according to the first to fourth embodiments is applied to a wheel loader or a forklift, power is supplied from the power storage real module to the traveling electric motor. The traveling electric motor drives a traveling device, for example, a wheel, to be driven. The traveling device is driven by the traveling electric motor to advance or reverse the main body attached to the traveling device.

  In the first to fifth embodiments, as a configuration example of the power storage module, a housing having a parallelepiped structure including side plates 32 and 33, end plates 31 and 34, a top plate 36, and a bottom plate 35 (FIG. 1A, FIG. 1B, etc.). Although the storage cell 20 and the heat transfer plate 21 are stored inside the body, the housing does not necessarily have a parallelepiped structure. For example, in FIG. 1A, the side plates 32 and 33 may be omitted, and a plurality of tie rods extending from one end plate 31 to the other end plate 34 may be arranged. In this case, the tie rod applies a compressive force to the storage cell 20 and the heat transfer plate 21.

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

20, 20a, 20b Power storage cell 21 Heat transfer plate 21A Inter-cell portion 21B Bending portion 21C Swelling portion 22 Flow path 23, 23a, 23b, 23y Step (position restraint structure)
24 Cooling medium introduction pipe 25 Cooling medium discharge pipe 26 Cooling medium supply device 27 Spacer 28a First surface 28b Second surface 31, 34 End plate 32, 33 Side plate 35 Bottom plate 36 Top plate 37 Fastener 38 Wiring (electrode tab)
39 Compressive force transmitting members 40, 41 Fastener 50 Tie rod 52 Flow path 70 Revolving body (driven object)
71 Traveling Device 73 Swivel 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

Claims (10)

A plurality of storage cells;
A heat transfer plate disposed between the storage cells and in contact with the storage cells on both sides;
The heat transfer plate have a first position restraining structure for inhibiting movement of the storage cells to one direction parallel to the surface of the heat transfer plate,
At least three power storage cells are arranged, and the heat transfer plate includes a plurality of inter-cell portions disposed between the power storage cells and a curved curved portion that connects the inter-cell portions. The inter-cell portion and the curved portion are formed by folding a single plate, and the vertical projection image on the first virtual plane is in a zigzag shape,
The first position constraint structure is a power storage module that prohibits movement of the power storage cell in a direction perpendicular to the first virtual plane . A plurality of storage cells;
A heat transfer plate disposed between the storage cells and in contact with the storage cells on both sides;
Have
The heat transfer plate has a first position restraining structure that prohibits movement of the storage cell in one direction parallel to the surface of the heat transfer plate,
At least three power storage cells are arranged, and the heat transfer plate includes a plurality of inter-cell portions disposed between the power storage cells and a curved curved portion that connects the inter-cell portions. The inter-cell portion and the curved portion are configured by folding a single plate,
Each of the energy storage cells has a plate-like outer shape, has a first edge and a second edge intersecting each other, and the plurality of energy storage cells are arranged in a thickness direction,
It said first position restraining structure, the first including a charge reservoir module the step of contacting the rim. The step provided on the first surface, which is one surface of the heat transfer plate, prohibits movement of the storage cell in contact with the first surface in the first direction, and the first surface is the other surface. 3. The power storage module according to claim 2 , wherein the step provided on the surface of 2 prohibits movement of the power storage cell in contact with the second surface in a direction opposite to the first direction. The heat transfer plate further includes a second position restraining structure that prohibits movement of the storage cell in a second direction that is parallel to the surface of the heat transfer plate and intersects the first direction ,
The curved portion includes a raised portion that is raised with reference to the outer surface of the two inter-cell portions that are continuous to the curved portion with respect to the arrangement direction of the storage cells, and the raised portion is the second portion. The electrical storage module of any one of Claim 1 thru | or 3 which acts as a position restraint structure . The power storage module according to any one of claims 1 to 4 , wherein a flow path for circulating a cooling medium is formed inside the heat transfer plate. Furthermore, it has a side plate arranged on the side of the laminate in which the storage cell and the heat transfer plate are arranged,
The power storage module according to claim 5 , wherein the heat transfer plate is thermally coupled to the side plate at an end surface thereof. The power storage module according to claim 6 , wherein a flow path for circulating a cooling medium is formed inside the side plate. An electricity storage module;
An electric motor receiving power from the power storage module;
A driving object driven by the electric motor,
The power storage module is:
A plurality of storage cells;
A heat transfer plate disposed between the storage cells and in contact with the storage cells on both sides;
The heat transfer plate have a first position restraining structure for inhibiting movement of the storage cells to one direction parallel to the surface of the heat transfer plate,
At least three power storage cells are arranged, and the heat transfer plate includes a plurality of inter-cell portions disposed between the power storage cells and a curved curved portion that connects the inter-cell portions. The inter-cell portion and the curved portion are formed by folding a single plate, and the vertical projection image on the first virtual plane is in a zigzag shape,
The first position constraint structure is a work machine that prohibits movement of the storage cell in a direction perpendicular to the first virtual plane . Furthermore, it has a traveling device for moving the drive object forward and backward,
The driving object is a revolving body attached to the traveling device so as to be able to turn,
The work machine according to claim 8 , wherein the electric motor turns the turning body. The work machine according to claim 8 , wherein the driving target is a traveling device that moves the main body forward or backward, and the electric motor drives the traveling device to move the main body forward or backward.

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