JP7276174B2 - power storage device - Google Patents

Description

The present disclosure relates to power storage devices.

As a conventional power storage module, there is a bipolar battery including a bipolar electrode in which a positive electrode is formed on one side of a metal plate and a negative electrode is formed on the other side (see, for example, Patent Document 1). A bipolar battery includes an electrode laminate formed by laminating a plurality of electrodes including a bipolar electrode with separators interposed therebetween. A sealing body made of resin is provided on the side surface of the electrode laminate to seal between the bipolar electrodes adjacent to each other in the stacking direction, and the internal space formed between the bipolar electrodes contains an electrolytic solution.

A power storage device including power storage modules as described above has a module laminate formed by stacking power storage modules via conductive plates, for example. The conductive plate is arranged between the end plates (such as terminal electrodes) of the energy storage modules adjacent to each other in the stacking direction of the energy storage modules in the module laminate, and electrically connects the energy storage modules.

JP 2011-204386 A

In a power storage device, undulations (unevenness) may occur on the contact surface of the power storage module with the conductive plate due to the thickness tolerance of the electrodes and separators included in the electrode laminate of the power storage module, or the formation conditions of the sealing body. be. When the conductive plate is composed of one plate-like member, if the contact surface with the conductive plate is undulated, it is conceivable that the contact area between the conductive plate and the power storage module is reduced. A decrease in the contact area may increase the resistance between the conductive plate and the power storage module. When the conductive plate has a cooling function, there is a possibility that the cooling efficiency of the conductive plate may not be sufficiently obtained due to the reduction of the contact area. In addition, when the conductive plate is formed of a single plate-like member, it is necessary to prepare a plurality of types of conductive plates for power storage modules of different sizes, which poses a problem of poor versatility.

To solve these problems, it is conceivable to connect a plurality of plate-like members to each other so as to be rotatable to form one conductive plate. In this case, since the shape of the conductive plate can be made to follow the shape of the contact surface of the power storage module by rotating the plate member, it is possible to suppress a decrease in the contact area between the contact surface and the conductive plate. In addition, since the size of the conductive plate can be adjusted by adjusting the number of plate-like members to be connected, the conductive plate can be applied to power storage modules of different sizes, increasing the versatility of the conductive plate. On the other hand, when a plurality of plate-like members are rotatably connected to form one conductive plate, a certain gap may occur between the plate-like members. In this case, for example, when the power storage module expands due to internal pressure fluctuation, the contact surface of the power storage module may enter the gap between the plate-like members, resulting in breakage of the contact surface.

The present disclosure has been made to solve the above problems, and can ensure followability to the contact surface of the power storage module and versatility for power storage modules of different sizes, and suppress damage to the contact surface when the power storage module expands. An object of the present invention is to provide a power storage device capable of

A power storage device according to one aspect of the present disclosure includes a plurality of power storage modules stacked via conductive plates and electrically connected in series, wherein the power storage modules are stacked in the stacking direction of the power storage modules. and a resin portion covering the edges of the plurality of electrodes, the plurality of electrodes comprising: a metal plate including one surface and the other surface facing each other; a positive electrode provided on one surface; The conductive plate has a bipolar electrode including a negative electrode provided on the other side, and the conductive plate is configured by rotatably connecting a plurality of plate-like members arranged in the first direction with a connecting portion. The first plate-like member and the second plate-like member, which are in contact with the exposed surface exposed from the resin portion at the end portion in the stacking direction of the module, and which are adjacent in the first direction among the plurality of plate-like members, Each of the first plate member and the second plate member has a connecting end surface facing each other, and the connecting portion extends from one end of the connecting end surface to the other in a second direction that intersects the first direction in plan view of the first plate-like member and the second plate-like member. extending over the edge.

In this power storage device, the conductive plate between the power storage modules is configured by rotatably connecting a plurality of plate-like members arranged in the first direction with the connecting portion. As a result, the shape of the conductive plate can follow the shape of the contact surface (exposed surface) of the power storage module due to the rotation of the plate-like member, thereby suppressing a decrease in the contact area between the contact surface of the power storage module and the conductive plate. can. In addition, since the size of the conductive plate can be adjusted by adjusting the number of plate-like members to be connected, the conductive plate can be applied to power storage modules of different sizes, increasing the versatility of the conductive plate. Further, in this conductive plate, the connecting portion extends from one end to the other end of the connecting end face in the second direction that intersects the first direction in plan view of the first plate-like member and the second plate-like member. ing. Since the connecting portion extends between the connecting end surfaces, it is possible to prevent the contact surface from entering between the plate-like members even when the power storage module expands due to internal pressure fluctuation or the like. Therefore, it is possible to suppress breakage of the contact surface when the power storage module expands.

The conductive plate may have a cooling mechanism for cooling the power storage module. When the conductive plate is provided with a cooling function in this manner, sufficient cooling efficiency of the conductive plate can be ensured by securing a contact area between the conductive plate and the contact surface of the power storage module.

The cooling mechanism may include a through hole for circulating a cooling fluid, and the through hole may penetrate the conductive plate in the second direction. In this case, the cooling mechanism for the conductive plate can be configured simply. Moreover, since the through-hole penetrates in the second direction, the gap extending to the connecting portion can be used as a gap through which the cooling fluid flows.

The connecting portion is provided on the connecting end face of the first plate-shaped member, and is provided on the connecting end face of the second plate-shaped member, and the first claw portion extends from one end to the other end of the connecting end face. and a second pawl portion that engages with the first pawl portion from one end to the other end of the connecting end surface. By configuring the connecting portion by engaging the first claw portion and the second claw portion, both simplification of the connecting portion and securing of assembling property can be achieved.

In the engaged state, the first claw portion and the second claw portion restrict relative movement of the storage module between the first plate-shaped member and the second plate-shaped member in the stacking direction and the first direction. You may each have the control part which carries out. By restricting the relative movement between the first plate-like member and the second plate-like member in the stacking direction and the first direction, the planar shape of the conductive plate can be easily maintained. Therefore, the assembling workability of the power storage device can be sufficiently ensured. In addition, by restricting the relative movement in the first direction between the first plate-like member and the second plate-like member, the movement between the first plate-like member and the second plate-like member gaps are less likely to occur between the connecting end surfaces of the Therefore, it is possible to more reliably prevent the contact surface from entering between the plate members.

The connecting portion is provided on the connecting end surface of the first plate member and extends from one end to the other end of the connecting end surface, and the connecting portion is provided on the connecting end surface of the second plate member and extends from the connecting end surface. It may be configured by a concave portion that fits into the convex portion from one end to the other end. By constructing the connecting portion by fitting the convex portion and the concave portion, both simplification of the connecting portion and securing of assembling property can be achieved.

The convex portion and the concave portion each have a restricting portion that restricts relative movement in the first direction and the stacking direction of the storage module between the first plate-like member and the second plate-like member in the fitted state. may be By restricting the relative movement between the first plate-like member and the second plate-like member in the stacking direction and the first direction, the planar shape of the conductive plate can be easily maintained. Therefore, the assembling workability of the power storage device can be sufficiently ensured. In addition, by restricting the relative movement in the first direction between the first plate-like member and the second plate-like member, the movement between the first plate-like member and the second plate-like member gaps are less likely to occur between the connecting end surfaces of the Therefore, it is possible to more reliably prevent the contact surface from entering between the plate members.

The conductive plate may have a rectangular shape including long sides and short sides in plan view, and the first direction may be along the long sides of the conductive plate. When a rectangular conductive plate is employed, by dividing the conductive plate in the long side direction by a plate member, it is possible to ensure that the shape of the conductive plate follows the shape of the contact surface of the power storage module.

The cross-sectional shape of the connecting portion may be uniform in the second direction. In this case, the plate member and the components of the connecting portion can be integrally formed by extrusion molding.

According to the present disclosure, it is possible to ensure followability to the contact surface of the power storage module and versatility for power storage modules of different sizes, and to suppress breakage of the contact surface when the power storage module expands.

It is a schematic sectional drawing which shows an example of an electrical storage apparatus. 3 is a cross-sectional view showing the internal configuration of the power storage module; FIG. FIG. 4 is a plan view showing a conductive plate on the power storage module; 4 is a perspective view of a single plate member of the conductive plate shown in FIG. 3. FIG. 4 is an enlarged cross-sectional view of a main part of the conductive plate shown in FIG. 3; FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate shown in FIG. 3; FIG. 11 is an enlarged cross-sectional view of a main part showing another embodiment of a conductive plate; FIG. 8 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate shown in FIG. 7; FIG. 11 is an enlarged cross-sectional view of a main part showing still another embodiment of a conductive plate; 10A is a schematic cross-sectional view showing a state before connection of the conductive plates shown in FIG. 9; FIG. 10B is a schematic cross-sectional view showing a state after connecting the conductive plates shown in FIG. 9; FIG. FIG. 10 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate shown in FIG. 9;

Hereinafter, preferred embodiments of a power storage device according to one aspect of the present disclosure will be described in detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an example of a power storage device according to this embodiment. A power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a module stack 2 including a plurality of stacked power storage modules 4 and a restraining member 3 that applies a restraining load to the module stack 2 in the stacking direction of the module stack 2 . In the following description, the stacking direction of the module stack 2 is the Z direction, the first direction orthogonal to the stacking direction is the X direction, and the second direction orthogonal to the stacking direction and the first direction is the Y direction. .

The module laminate 2 includes a plurality of (three in this embodiment) power storage modules 4 and a plurality of (four in this embodiment) conductive plates 5 . The power storage module 4 is a bipolar battery and has a rectangular shape when viewed in the Z direction. The power storage module 4 is, for example, a secondary battery such as a nickel-hydrogen secondary battery or a lithium-ion secondary battery, or an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery is exemplified as the power storage module 4 .

A plurality of power storage modules 4 are stacked along the Z direction via conductive plates 5 and electrically connected in series in the Z direction. The conductive plate 5 is a plate-like member made of a conductive material such as metal. Examples of the material of the conductive plate 5 include aluminum. A plated layer such as nickel may be formed on the surface of the conductive plate 5 . The conductive plate 5 is arranged between the power storage modules 4 adjacent to each other in the Z direction. Electricity storage modules 4 adjacent to each other are electrically connected via conductive plates 5 . A conductive plate P electrically connected to the power storage module 4 and an insulating plate B are stacked in this order on one stacking end of the module stack 2 in the Z direction. Similarly, a conductive plate P and an insulating plate B are laminated in this order on the other laminated end of the module laminated body 2 in the Z direction. A negative electrode terminal 7 is connected to one conductive plate P, and a positive electrode terminal 6 is connected to the other conductive plate P. As shown in FIG. Each of the positive terminal 6 and the negative terminal 7 is pulled out from the edge of the conductive plate P in the X direction, for example. The power storage device 1 is charged and discharged by the positive terminal 6 and the negative terminal 7 .

A plurality of through holes (channels) 5a for circulating a cooling fluid F (see FIGS. 3 and 4) such as air are provided inside the conductive plates 5 arranged between the power storage modules 4. As shown in FIG. A plurality of through-holes 5 a constitute a cooling mechanism for cooling power storage module 4 . The conductive plate 5 has a function as a connecting member that electrically connects the power storage modules 4 adjacent to each other. It has a function as a heat sink. In the example shown in FIG. 1 , the area of the conductive plate 5 viewed from the Z direction is smaller than the area of the power storage module 4 . However, from the viewpoint of improving heat dissipation, the area of conductive plate 5 may be the same as the area of power storage module 4 or may be larger than the area of power storage module 4 . A detailed configuration of the conductive plate 5 will be described later.

The restraining member 3 is composed of a pair of end plates 8 sandwiching the module stack 2 in the Z direction, and fastening bolts 9 and nuts 10 fastening the end plates 8 together. The end plate 8 is a rectangular metal plate having an area one size larger than the areas of the storage module 4, the conductive plate 5, and the conductive plate P when viewed from Z. As shown in FIG. An insulating plate B having electrical insulation is provided between the end plate 8 and the conductive plate P. As shown in FIG. The insulating plate B insulates between the end plate 8 and the conductive plate P. As shown in FIG.

An insertion hole 8 a is provided in the edge of the end plate 8 at a position outside the module stack 2 . The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8. As shown in FIG. A nut 10 is screwed onto the tip portion of the fastening bolt 9 protruding from the insertion hole 8a of the other end plate 8 . As a result, the storage module 4 , the conductive plate 5 , and the conductive plate P are sandwiched between the end plates 8 and unitized as the module laminate 2 . A binding load is applied to the module laminate 2 in the Z direction.

Next, a specific configuration of the power storage module 4 will be described. FIG. 2 is a schematic cross-sectional view showing the internal configuration of the power storage module 4 shown in FIG. As shown in FIG. 2 , the power storage module 4 includes an electrode laminate 11 and a resin sealing body 12 (resin portion) that seals the electrode laminate 11 . The electrode laminate 11 is composed of a plurality of electrodes laminated along the Z direction with separators 13 interposed therebetween. These electrodes include a plurality of bipolar electrodes 14 , negative terminal electrodes 18 and positive terminal electrodes 19 .

The bipolar electrode 14 has a metal plate 15 including one side 15a and the other side 15b facing each other in the Z direction, a positive electrode 16 provided on the one side 15a, and a negative electrode 17 provided on the other side 15b. there is The positive electrode 16 is formed by coating the metal plate 15 with a positive electrode active material. Examples of the positive electrode active material forming the positive electrode 16 include nickel hydroxide. The negative electrode 17 is formed by coating the metal plate 15 with a negative electrode active material. Examples of negative electrode active materials that constitute the negative electrode 17 include hydrogen storage alloys.

In this embodiment, the formation area of the negative electrode 17 on the other surface 15 b of the metal plate 15 is one size larger than the formation area of the positive electrode 16 on the one surface 15 a of the metal plate 15 . In the electrode stack 11 , the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of another bipolar electrode 14 that is adjacent on one side in the Z direction with the separator 13 interposed therebetween. In the electrode stack 11 , the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of another bipolar electrode 14 adjacent to the other in the Z direction with the separator 13 interposed therebetween.

The negative terminal electrode 18 has a metal plate 15 and a negative electrode 17 provided on the other surface 15 b of the metal plate 15 . The negative terminal electrode 18 is arranged at one end of the electrode stack 11 in the Z direction so that the other surface 15b faces the center of the electrode stack 11 in the Z direction. The negative electrode 17 provided on the other surface 15b of the metal plate 15 of the negative terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 adjacent to the negative terminal electrode 18 in the Z direction with the separator 13 interposed therebetween. One surface 15a of the metal plate 15 of the negative terminal electrode 18 constitutes one outer surface in the Z direction of the electrode laminate 11, and is one conductive plate 5 or conductive plate P adjacent to the electricity storage module 4 (see FIG. 1). is electrically connected to

The positive terminal electrode 19 has a metal plate 15 and a positive electrode 16 provided on one surface 15 a of the metal plate 15 . The positive terminal electrode 19 is arranged at the other end of the electrode stack 11 in the Z direction so that one surface 15 a faces the center of the electrode stack 11 in the Z direction. The positive electrode 16 provided on one surface 15 a of the positive terminal electrode 19 faces the negative electrode 17 of the bipolar electrode 14 adjacent to the positive terminal electrode 19 in the Z direction with the separator 13 interposed therebetween. The other surface 15b of the metal plate 15 of the positive terminal electrode 19 constitutes the other Z-direction outer surface of the electrode laminate 11, and is the other conductive plate 5 or conductive plate P adjacent to the storage module 4 (see FIG. 1). is electrically connected to

The metal plate 15 is composed of, for example, a plated nickel plate or a plated steel plate. In this embodiment, the metal plate 15 is made of a plated steel plate obtained by plating the surface of the steel plate with nickel. Steel sheets that serve as base materials for plated steel sheets are, for example, ordinary steels such as rolled steels, or special steels such as stainless steels. An edge portion 15c of the metal plate 15 has a rectangular frame shape and is an uncoated region where the positive electrode active material and the negative electrode active material are not coated.

The separator 13 is formed in a sheet shape, for example. Examples of the separator 13 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), and woven or nonwoven fabrics made of polypropylene, methylcellulose, and the like. The separator 13 may be reinforced with a vinylidene fluoride resin compound.

The sealing body 12 is made of an insulating resin, for example, and has a rectangular frame shape as a whole. Sealing body 12 is provided on side surface 11 a of electrode laminate 11 so as to surround edge 15 c of metal plate 15 . The encapsulant 12 holds the edge 15c on the side surface 11a. The sealing body 12 includes a plurality of first sealing portions 21 coupled to the edge portion 15c of the metal plate 15, and first sealing portions 21 extending along the Z direction along the side surface 11a and coupled to each of the first sealing portions 21. 2 sealing portion 22 . Each of the first sealing portion 21 and the second sealing portion 22 is made of an insulating resin having alkali resistance. Examples of materials constituting the first sealing portion 21 and the second sealing portion 22 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The first sealing portion 21 is, for example, a film having a predetermined thickness in the Z direction. The first sealing portion 21 is provided continuously over the entire circumference of the edge portion 15c on the one surface 15a of the metal plate 15, and has a rectangular frame shape when viewed from the Z direction (see FIG. 3). In this embodiment, the first sealing portion 21 is provided not only on the metal plate 15 of the bipolar electrode 14 but also on the metal plate 15 of the negative terminal electrode 18 and the metal plate 15 of the positive terminal electrode 19 . In the negative terminal electrode 18 , the first sealing portion 21 is provided on the edge portion 15 c of the one surface 15 a of the metal plate 15 . In the positive terminal electrode 19 , the first sealing portion 21 is provided on the edge portions 15 c of both the one surface 15 a and the other surface 15 b of the metal plate 15 .

The inner portion of the first sealing portion 21 is positioned between the edge portions 15c of the metal plates 15 adjacent to each other in the Z direction. The outer portion of the first sealing portion 21 protrudes outside the outer edge of the metal plate 15 and is held by the second sealing portion 22 . The first sealing portions 21 adjacent to each other along the Z direction may be separated from each other or may be in contact with each other. Also, the outer portions of the first sealing portion 21 may be joined together by, for example, hot plate welding. At the overlapping portion K between the first sealing portion 21 and the edge portion 15c of the metal plate 15, the first sealing portion 21 is hermetically welded to the metal plate 15 by, for example, ultrasonic waves or thermocompression.

In welding the first sealing portion 21 to the metal plate 15, the surface of the metal plate 15 is roughened by, for example, a plurality of projection-like plating formed by electrolytic plating. At least the surface of the metal plate 15 to which the first sealing portion 21 is to be welded may be roughened. In the present embodiment, only one surface 15a of the metal plate 15 forming the bipolar electrode 14 and the metal plate 15 forming the negative terminal electrode 18 may be roughened. As for the plate 15, it is sufficient that both the one surface 15a and the other surface 15b are roughened. At the bonding interface between the metal plate 15 and the first sealing portion 21, the molten resin enters between a plurality of projection-shaped platings formed by roughening the surface, thereby exerting an anchor effect. Thereby, the bonding strength between the metal plate 15 and the first sealing portion 21 can be improved.

The second sealing portion 22 is provided outside the electrode laminate 11 and the first sealing portion 21 and constitutes an outer wall (housing) of the power storage module 4 . The second sealing portion 22 is formed, for example, by injection molding of resin, and extends over the entire length of the electrode laminate 11 along the Z direction. The second sealing portion 22 has a rectangular frame shape extending in the Z direction (see FIG. 3). The second sealing portion 22 is welded to the outer portion of the first sealing portion 21 by heat during injection molding, for example.

The first sealing portion 21 and the second sealing portion 22 seal an internal space V formed between adjacent electrodes. More specifically, the second sealing portion 22, together with the first sealing portion 21, is arranged between the bipolar electrodes 14 adjacent to each other, between the negative terminal electrode 18 and the bipolar electrode 14 adjacent to each other, and between the negative terminal electrode 18 and the bipolar electrode 14 adjacent to each other. It seals between the positive terminal electrode 19 and the bipolar electrode 14 respectively. As a result, airtight internal spaces V are formed between the adjacent bipolar electrodes 14, between the negative terminal electrode 18 and the bipolar electrode 14, and between the positive terminal electrode 19 and the bipolar electrode 14, respectively. ing. The internal space V accommodates a water-based electrolytic solution (not shown) containing an alkaline solution such as an aqueous potassium hydroxide solution. The separator 13, the positive electrode 16, and the negative electrode 17 are impregnated with the electrolytic solution.

Next, a detailed configuration of the conductive plate 5 described above will be described.

FIG. 3 is a plan view showing the conductive plate 5 on the power storage module 4. FIG. As shown in FIG. 3 , the conductive plate 5 has a rectangular shape having an area slightly smaller than the planar shape of the power storage module 4 when viewed in the Z direction (that is, in plan view). In this embodiment, the conductive plate 5 has a rectangular shape including a pair of long sides 5b and 5c and a pair of short sides 5d and 5e. A pair of long side 5b and long side 5c extends along the X direction and faces each other in the Y direction. A pair of short sides 5d and 5e extends along the Y direction and faces each other in the X direction. Detecting elements 70 are connected to the short sides 5d and 5e of the conductive plate 5, respectively. The detection element 70 includes, for example, an element that detects the temperature of the power storage module 4 and an element that detects the voltage output from the power storage module 4 .

The conductive plate 5 is positioned within the frame of the second sealing portion 22 . Each of surfaces 50 a and 50 b on both sides of the conductive plate 5 in the thickness direction serves as a connection surface electrically connected to the adjacent power storage module 4 . The edge region of the connecting surface overlaps with the inner portion of the first sealing portion 21 projecting inward from the inner edge of the second sealing portion 22 . In the electric storage module 4, the central region of the electrode laminate 11 (the region where the active material layer is arranged in the bipolar electrode 14) is actually the edge region (the edge 15c of the metal plate 15 and the first sealing portion 21). is swelled in the Z direction compared to the region where is welded). Therefore, the central region of the connection surface is in contact with the outermost metal plate 15 exposed from the sealing body 12 at the end of the electrode laminate 11 in the Z direction. That is, the contact surface (exposed surface) of the metal plate 15 with the central region of the connection surface is the contact surface with the conductive plate 5 of the power storage module 4 .

The conductive plate 5 includes a plurality of (four in this embodiment) plate-shaped members 50 arranged along the X direction, and a connecting portion 60 that rotatably connects the plate-shaped members 50 adjacent to each other in the X direction. and includes Each plate member 50 has a rectangular shape when viewed from the Z direction (that is, when viewed from above). In this embodiment, each plate member 50 has a rectangular shape including a pair of long sides along the Y direction and a pair of short sides along the X direction when viewed from the Z direction. The plate-like members 50 are arranged along the X direction so that the long sides of the plate-like members 50 adjacent to each other face each other in the X direction.

The plate member 50 includes a pair of end faces 50c and 50d facing each other in the X direction and a pair of end faces 50e and 50f facing each other in the Y direction. Each of the end face 50c and the end face 50d is a flat surface including the long side of the plate member 50 and extends along the YZ plane. Each of the end face 50c and the end face 50d extends along the Y direction. The end surface 50c is located on the side of the short side 5d in the X direction, and the end surface 50d is located on the side of the short side 5e in the X direction. Of the two plate-like members 50 adjacent to each other in the X direction, the end surface 50c of one plate-like member 50 and the end surface 50d of the other plate-like member 50 face each other in the X direction. Each of the end face 50c and the end face 50d facing each other is a connecting end face that is connected to each other by the connecting portion 60. As shown in FIG. The connecting portion 60 extends from one end to the other end in the Y direction on each of the end faces 50c and 50d, and has the same XZ cross-sectional shape at each position along the Y direction. That is, the XZ cross-sectional shape of the connecting portion 60 is uniform in the Y direction.

Each of the end face 50e and the end face 50f is a flat surface including the short sides of the plate member 50 and extends along the XZ plane. Each of the end face 50e and the end face 50f extends along the X direction. The end face 50e is located on the side of the long side 5b in the Y direction, and connects one ends of the end face 50c and the end face 50d in the Y direction. The end face 50f is located on the side of the long side 5c in the Y direction, and connects the other ends in the Y direction of the end face 50c and the end face 50d. In each plate member 50, the Y-direction positions of the end faces 50e are aligned with each other, and the Y-direction positions of the end faces 50f are aligned with each other.

FIG. 4 is a perspective view of a single plate member 50 of the conductive plate 5. FIG. As shown in FIG. 4, each plate member 50 is formed with a plurality of through holes 5a described above. Each through-hole 5a penetrates the inside of the plate-like member 50 in the Y direction from the end surface 50e to the end surface 50f of the plate-like member 50, and is arranged along the X direction. The cross-sectional shape of each through-hole 5a is, for example, a rectangular shape whose longitudinal direction is the X direction when viewed from the Y direction. A cooling fluid F flows through each through hole 5a. The cooling fluid F flows in the Y direction through the through holes 5a from the end face 50e side of the plate member 50 toward the end face 50f side, for example.

FIG. 5 is an enlarged cross-sectional view of the main part of the conductive plate 5, showing in detail the structure of the connecting part 60 that connects the plate members 50 to each other. Hereinafter, when two plate-shaped members 50 adjacent to each other in the X direction are separately described, one plate-shaped member 50 is referred to as a first plate-shaped member 51, and the other plate-shaped member 50 is referred to as a first plate-shaped member 51. 2 plate-like member 52 . As shown in FIG. 5, the connecting portion 60 includes a first claw portion 61 provided on the end surface 50d of the first plate member 51 and a second claw portion provided on the end surface 50c of the second plate member 52. 62 and . The first claw portion 61 protrudes in the X direction from the end surface 50d of the first plate-shaped member 51 toward the end surface 50c of the second plate-shaped member 52. It extends from one end to the other end in the Y direction. The first claw portion 61 has the same XZ cross-sectional shape from one end to the other end in the Y direction of the end surface 50d of the first plate member 51 . That is, the XZ cross-sectional shape of the first claw portion 61 is uniform in the Y direction. The XZ cross section of the first claw portion 61 has, for example, a rectangular spiral shape.

The first claw portion 61 includes a wall portion 61a projecting in the X direction from the end surface 50d of the first plate member 51, a wall portion 61b projecting from the wall portion 61a in the Z direction, and a wall portion 61b projecting in the X direction from the wall portion 61b. It includes a protruding wall portion 61c and a wall portion 61d protruding from the wall portion 61c in the Z direction. The wall portion 61a extends linearly in the X direction from the end portion of the end face 50d of the first plate-like member 51 on the side of the surface 50b toward the end face 50c of the second plate-like member 52 . The wall portion 61b extends linearly from the tip of the wall portion 61a on the side of the end surface 50c in the X direction toward the surface 50a in the Z direction. The wall portion 61c extends linearly from the front end of the wall portion 61b on the side of the surface 50a in the Z direction toward the end surface 50d of the first plate member 51 in the X direction. The wall portion 61d extends linearly from the tip of the wall portion 61c on the side of the end surface 50d in the X direction toward the surface 50b in the Z direction.

The second claw portion 62 protrudes in the X direction from the end face 50c of the second plate-shaped member 52 toward the end face 50d of the first plate-shaped member 51. It extends from one end to the other end in the Y direction. The second claw portion 62 is engaged with the first claw portion 61 from one end to the other end of the end face 50c of the second plate-like member 52 . Like the first claw portion 61, the second claw portion 62 has the same XZ cross-sectional shape from one end to the other end in the Y direction of the end face 50c of the second plate member 52. As shown in FIG. That is, the XZ cross-sectional shape of the second claw portion 62 is uniform in the Y direction. The XZ cross section of the second claw portion 62 has, for example, a rectangular spiral shape whose rotation direction is reversed from that of the first claw portion 61 .

The second claw portion 62 includes a wall portion 62a projecting from the end surface 50c of the second plate member 52 in the X direction, a wall portion 62b projecting from the wall portion 62a in the Z direction, and a wall portion 62b projecting from the wall portion 62b in the X direction. It includes a projecting wall portion 62c and a wall portion 62d projecting from the wall portion 62c in the Z direction. The wall portion 62a extends linearly in the X direction from the end portion of the end face 50c of the second plate member 52 on the side of the surface 50a toward the end face 50d of the first plate member 51 . The wall portion 62b extends linearly from the tip of the wall portion 62a on the side of the end surface 50d in the X direction toward the surface 50b side in the Z direction. The wall portion 62c extends linearly from the tip of the wall portion 62b on the side of the surface 50b in the Z direction toward the end surface 50c side in the X direction. The wall portion 62d extends linearly from the tip of the wall portion 62c on the side of the end face 50c in the X direction toward the surface 50a in the Z direction.

When the first claw portion 61 and the second claw portion 62 are engaged with each other, the wall portion 61b of the first claw portion 61 is separated from the wall portion 62d of the second claw portion 62 and the second plate in the X direction. and the end face 50 c of the shaped member 52 . The wall portion 61c of the first claw portion 61 is arranged between the wall portion 62a and the wall portion 62d of the second claw portion 62 in the Y direction. The wall portion 61d of the first claw portion 61 is arranged between the wall portion 62b and the wall portion 62d of the second claw portion 62 in the X direction. The wall portion 62b of the second claw portion 62 is arranged between the wall portion 61d of the first claw portion 61 and the end surface 50d of the first plate member 51 in the X direction. The wall portion 62c of the second claw portion 62 is arranged between the wall portion 61a and the wall portion 61d of the first claw portion 61 in the Y direction. The wall portion 62d of the second claw portion 62 is arranged between the wall portion 61b and the wall portion 61d of the first claw portion 61 in the X direction.

A gap in the X direction and the Z direction is formed in the connecting portion 60 constituted by the first claw portion 61 and the second claw portion 62 . The gaps in the X direction are the gap between the wall portion 61d of the first claw portion 61 and the wall portion 62d of the second claw portion 62, the gap between the wall portion 62d and the wall portion 61b of the first claw portion 61, and , the gap between the wall portion 61b and the end surface 50c of the second plate member 52. As shown in FIG. The gap in the Z direction is the gap between the wall portion 61a of the first claw portion 61 and the wall portion 62c of the second claw portion 62, and the gap between the wall portion 62c and the wall portion 61d of the first claw portion 61. Consists of These gaps extend from the end face 50e to the end face 50f of the plate member 50 along the Y direction. Therefore, these gaps can be used as flow paths for the cooling fluid F (see FIGS. 3 and 4) flowing along the Y direction.

When the second plate-like member 52 is moved in the X direction with respect to the first plate-like member 51, the wall portion 62d of the second claw portion 62 and the wall portion 61b of the first claw portion 61 are in the X direction. It moves by the gap in the direction and comes into contact with the wall portion 61b, or moves by the gap in the X direction between the first claw portion 61 and the wall portion 61d and comes into contact with the wall portion 61d. This abutment restricts the movement of the second plate-like member 52 in the X direction with respect to the first plate-like member 51 . Therefore, the wall portion 61b and the wall portion 61d constitute a restricting portion that restricts movement of the second plate-like member 52 with respect to the first plate-like member 51 in the X direction.

Further, when the first plate-like member 51 is moved in the X direction with respect to the second plate-like member 52, the wall portion 61d of the first claw portion 61 and the wall portion 62b of the second claw portion 62 or the X-direction gap between the second claw portion 62 and the wall portion 62d to contact the wall portion 62d. This abutment restricts the movement of the first plate-like member 51 in the X direction with respect to the second plate-like member 52 . Therefore, the wall portion 62b and the wall portion 62d constitute a restricting portion that restricts movement of the first plate-like member 51 with respect to the second plate-like member 52 in the X direction.

When the second plate-like member 52 is moved in the Z direction with respect to the first plate-like member 51, the wall portion 62c of the second claw portion 62 and the wall portion 61a of the first claw portion 61 move in the Z direction. It moves by the gap in the direction and comes into contact with the wall portion 61a, or moves by the gap in the Z direction between the first claw portion 61 and the wall portion 61d and comes into contact with the wall portion 61d. This abutment restricts the movement of the second plate-like member 52 in the Z direction with respect to the first plate-like member 51 . Therefore, the wall portion 61a and the wall portion 61d constitute a restricting portion that restricts movement of the second plate-like member 52 with respect to the first plate-like member 51 in the Z direction.

When the first plate-like member 51 is moved in the Z direction with respect to the second plate-like member 52, the wall portion 61c of the first claw portion 61 and the wall portion 62a of the second claw portion 62 move in the Z direction. It moves by the gap in the direction and comes into contact with the wall portion 62a, or moves by the gap in the Z direction between the second claw portion 62 and the wall portion 62d and comes into contact with the wall portion 62d. This abutment restricts the movement of the first plate member 51 in the Z direction with respect to the second plate member 52 . Therefore, the wall portion 62a and the wall portion 62d constitute a restricting portion that restricts movement of the first plate-like member 51 with respect to the second plate-like member 52 in the Z direction.

When the first plate-like member 51 and the second plate-like member 52 are relatively moved in the Y direction, the XZ cross-sectional shapes of the first claw portion 61 and the second claw portion 62 are uniform in the Y direction. Therefore, the first claw portion 61 and the second claw portion 62 slide in the Y direction without coming into contact with each other. That is, the first claw portion 61 and the second claw portion 62 are movable relative to each other in the Y direction.

The first claw portion 61 and the second claw portion 62 are configured to be rotatable relative to each other. “Rotatable” means that the relative positions of the first claw portion 61 and the second claw portion 62 are not fixed in the direction around the center of rotation. The “rotational center” is, for example, the central portion of the connecting portion 60 configured by the first claw portion 61 and the second claw portion 62 . Specifically, the “rotation center” is, for example, the tip of the wall portion 61d of the first claw portion 61 or the tip of the wall portion 62d of the second claw portion 62 . "Configured to be rotatable" means that the relative position between the first claw portion 61 and the second claw portion 62 in the direction around the rotation center is not strictly fixed, and the relative position is not fixed. It includes both the case of slight movement and the case of free movement of the relative position. In the present embodiment, a case in which the relative positions are freely moved is exemplified.

Engagement and disengagement between the first claw portion 61 and the second claw portion 62 are performed by moving the first plate-like member 51 and the second plate-like member 52 to a predetermined position with the rotation center as a reference. This is done by rotating them relative to each other until they reach a relative angle. Specifically, from the state shown in FIG. 5, the first plate member 51 and the second plate member 52 are moved in a direction in which the surfaces 50b of the first plate member 51 and the second plate member 52 approach each other. The engagement between the first claw portion 61 and the second claw portion 62 is released by relatively rotating the shaped member 52 until the relative angle becomes, for example, 90° or less. 5 (that is, the relative angle becomes 180°) from the state in which the first plate-shaped member 51 and the second plate-shaped member 52 are relatively rotated to the above-mentioned relative angle. The first claw portion 61 and the second claw portion 62 are engaged with each other by rotating the first plate-like member 51 and the second plate-like member 52 relative to each other.

The engagement and disengagement between the first claw portion 61 and the second claw portion 62 may be performed by sliding the first claw portion 61 and the second claw portion 62 in the Y direction. good. That is, the first claw portion 61 and the second claw portion 62 are relatively moved in the Y direction so as to slide against each other from positions shifted from each other in the Y direction. may be engaged with each other. Further, the first claw portion 61 and the second claw portion 62 can be displaced from each other in the Y direction by relative movement in the Y direction from the engaged state of the first claw portion 61 and the second claw portion 62 . , the engagement between the first claw portion 61 and the second claw portion 62 may be released.

In FIG. 5, the end surface 50d of the first plate-like member 51 is provided with the first claw portion 61, while the end surface 50c of the first plate-like member 51 is provided with the second claw portion 62. As shown in FIG. Similarly, the end face 50c of the second plate member 52 is provided with the second claw portion 62, while the end face 50d of the second plate member 52 is provided with the first claw portion 61. As shown in FIG. That is, in the example shown in FIG. 5, each plate-like member 50 has a configuration in which a first claw portion 61 is provided on the end face 50d and a second claw portion 62 is provided on the end face 50c. The first claw portion 61 or the second claw portion 62 may not be provided on the end face 50c of the plate member 50 located at one end of the short side 5d in the X direction (see FIG. 3). Another connection mechanism may be provided on the end face 50c of the plate-like member 50, and one detection element 70 may be connected by this connection mechanism. Similarly, the end face 50d of the plate-like member 50 positioned at the other end of the short side 5e in the X direction (see FIG. 3) may be provided with either the first claw portion 61 or the second claw portion 62. good. Another connection mechanism may be provided on the end surface 50d of the plate-like member 50, and the other detection element 70 may be connected by this connection mechanism.

When forming the conductive plate 5 having the above configuration, first, each plate member 50 having the first claw portion 61 and the second claw portion 62 provided on the end surface 50d and the end surface 50c is formed by extrusion molding. do. At this time, the pushing direction of each plate member 50 is defined as the Y direction. The YZ cross section of each of the plate member 50, the first claw portion 61, and the second claw portion 62 formed in this manner is uniform in the Y direction. Next, by engaging the first claw portion 61 and the second claw portion 62, the respective plate-like members 50 are connected to each other. At this time, as described above, by rotating the first plate member 51 and the second plate member 52 relative to each other, the first claw provided on the end surface 50d of the first plate member 51 is pulled out. The portion 61 and the second claw portion 62 provided on the end face 50c of the second plate-like member 52 are engaged with each other.

By connecting the plate members 50 to each other in this way, the conductive plate 5 is obtained. Then, each detection element 70 is connected to each of the short sides 5d and 5e of the conductive plate 5, and the conductive plate 5 to which each detection element 70 is connected and the power storage module 4 are alternately laminated to form a conductive plate. A module stack 2 is formed by stacking a plurality of power storage modules 4 via 5 . After that, the restraint member 3 is attached to the module laminate 2 to obtain the power storage device 1 .

Next, the effect of the electrical storage apparatus 1 which concerns on this embodiment is demonstrated. In the power storage device 1 according to the present embodiment, the conductive plate 5 between the power storage modules 4 is configured by rotatably connecting a plurality of plate-like members 50 arranged in the X direction with the connecting portion 60 . . As a result, the shape of the conductive plate 5 can follow the shape of the contact surface of the power storage module 4 with the conductive plate 5 by rotating the plate member 50 . When the contact surface of the electricity storage module 4 is undulated (unevenness) due to the thickness tolerance of the electrodes and the separator 13 included in the electrode laminate 11, or the formation conditions of the sealing body 12, etc. There is For example, in the manufacturing process of the electric storage module 4, the press pressure when pressing the positive electrode 16 or the negative electrode 17 onto the metal plate 15 included in the electrode is applied only to the portions of the metal plate 15 where the positive electrode 16 and the negative electrode 17 are provided. As a result, the surface of the electrode undulates, which can cause the contact surface of the power storage module 4 to undulate. If the shape of the conductive plate 5 can follow the shape of the contact surface of the electricity storage module 4, even if the contact surface of the electricity storage module 4 is undulated, the contact surface of the electricity storage module 4 and the conductive plate 5 can be easily separated. Reduction in contact area can be suppressed.

In addition, since the size of the conductive plate 5 can be adjusted by adjusting the number of plate-like members 50 to be connected, the conductive plate 5 can be applied to power storage modules 4 of different sizes, and the versatility of the conductive plate 5 is enhanced. Also, in the conductive plate 5, the connecting portion 60 extends from one end to the other end of the end face 50c and the end face 50d. Since the connecting part 60 extends between the end face 50c and the end face 50d, it is possible to prevent the contact surface from entering between the plate members 50 even when the power storage module 4 expands due to internal pressure fluctuation or the like. . Therefore, damage to the contact surface when the power storage module 4 expands can be suppressed.

In the power storage device 1 according to this embodiment, the conductive plate 5 has a cooling mechanism for cooling the power storage module 4 . By providing the conductive plate 5 with a cooling function in this manner, the contact area between the conductive plate 5 and the contact surface of the power storage module 4 is ensured, so that the cooling efficiency of the conductive plate 5 can be sufficiently ensured.

In the power storage device 1 according to the present embodiment, the cooling mechanism includes a through hole 5a for circulating the cooling fluid F, and the through hole 5a penetrates the inside of the conductive plate 5 in the Y direction. Thereby, the cooling mechanism for the conductive plate 5 can be easily constructed. In addition, since the through hole 5a penetrates in the Y direction, the gap extending to the connecting portion 60 can be used as a gap through which the cooling fluid F flows.

In the power storage device 1 according to the present embodiment, the connecting portion 60 is provided on the end surface 50c of the first plate-like member 51, and includes a first claw portion 61 extending from one end of the end surface 50c to the other end, and a second claw portion 61 extending from one end of the end surface 50c to the other end. and a second claw portion 62 provided on the end surface 50d of the plate-like member 52 and engaged with the first claw portion 61 from one end to the other end of the end surface 50d. By configuring the connecting portion 60 by engaging the first claw portion 61 and the second claw portion 62, the connecting portion 60 can be simplified. Further, by rotating the first claw portion 61 and the second claw portion 62 relative to each other, the first claw portion 61 and the second claw portion 62 can be engaged with each other. enough to secure it.

In the power storage device 1 according to the present embodiment, the first claw portion 61 and the second claw portion 62 are located between the first plate-like member 51 and the second plate-like member 52 in the engaged state. 4 has restricting portions for restricting relative movement in the Z direction and the X direction. By restricting the relative movement in the Z direction and the X direction between the first plate-like member 51 and the second plate-like member 52, the planar shape of the conductive plate 5 can be easily maintained. Therefore, the assembling workability of the power storage device 1 can be sufficiently ensured. In addition, by restricting the relative movement in the X direction between the first plate-like member 51 and the second plate-like member 52, the first plate-like member 51 and the second plate-like member 52 are separated from each other. A gap is less likely to occur between the end face 50c and the end face 50d. Therefore, it is possible to more reliably prevent the contact surface of the power storage module 4 from entering between the plate members 50 .

In the power storage device 1 according to the present embodiment, the conductive plate 5 has a rectangular shape including a pair of long sides 5b and 5c and a pair of short sides 5d and 5e in plan view. are arranged along the long sides 5 b and 5 c of the conductive plate 5 . When a rectangular conductive plate 5 is used, the plate member 50 divides the conductive plate 5 in the long side direction so that the shape of the conductive plate 5 can follow the shape of the contact surface of the power storage module 4 appropriately. can.

In the power storage device 1 according to this embodiment, the cross-sectional shape of the connecting portion 60 is uniform in the Y direction. Therefore, the plate member 50 and the components of the connecting portion 60 can be integrally formed by extrusion molding.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made.

FIG. 6 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate 5. As shown in FIG. A conductive plate 5A shown in FIG. A first claw portion 61 is provided in place of the second claw portion 62 on the end surface 50c. Therefore, in the conductive plate 5A, the second claw portions 62 are provided on both the end face 50c and the end face 50d of the first plate-shaped member 51, and the end face 50c and the end face 50d of the second plate-shaped member 52 are A first claw portion 61 is provided on both sides.

Even with such a form, the same effect as that of the conductive plate 5 can be obtained. In the conductive plate 5A, the first claw portions 61 may be provided on both the end surface 50c and the end surface 50d of the first plate-like member 51, and the end surfaces 50c and 50d of the second plate-like member 52 may be provided with the first claw portions 61, may be provided with the second claw portions 62 respectively. Alternatively, in each plate member 50 of the conductive plate 5A, the second claw portion 62 may be provided on each end face 50d, and the first claw portion 61 may be provided on each end face 50c.

FIG. 7 is an enlarged cross-sectional view of a main part showing another embodiment of the conductive plate 5. As shown in FIG. A conductive plate 5B shown in FIG. The connecting portion 60A includes a first claw portion 61A instead of the first claw portion 61, and a second claw portion 62A instead of the second claw portion 62. As shown in FIG. The first claw portion 61A differs from the first claw portion 61 of the conductive plate 5 in that the XZ cross section of the first claw portion 61A has a circular spiral shape. The first claw portion 61A includes a wall portion 61e, a wall portion 61f, a wall portion 61g, and a wall portion corresponding to the wall portions 61a, 61b, 61c, and 61d of the first claw portion 61, respectively. 61h included. The wall portion 61e, the wall portion 61f, the wall portion 61g, and the wall portion 61h are smoothly continuous in an arc shape in the XZ cross section.

The tip of the wall portion 61e on the side of the end surface 50c in the X direction is curved in an arc toward the surface 50a in the Z direction. The wall portion 61f is curved in an arc so as to swell toward the end face 50c in the X direction, and is smoothly connected to the tip of the wall portion 61e. The wall portion 61g is curved in an arc so as to swell toward the surface 50a in the Z direction, and is smoothly connected to the tip of the wall portion 61f on the side of the surface 50a in the Z direction. The wall portion 61h is curved in an arc so as to be smoothly connected to the tip of the wall portion 61g on the side of the end surface 50d in the X direction.

The second claw portion 62A is the second claw portion of the conductive plate 5 in that the XZ cross section of the second claw portion 62A has a circular spiral shape having 180° rotational symmetry with the first claw portion 61A. It differs from the claw portion 62 . The second claw portion 62A includes a wall portion 62e, a wall portion 62f, a wall portion 62g, and a wall portion corresponding to the wall portions 62a, 62b, 62c, and 62d of the second claw portion 62, respectively. 62h included. The wall portion 62e, the wall portion 62f, the wall portion 62g, and the wall portion 62h are smoothly continuous in an arc shape in the XZ cross section.

The tip of the wall portion 62e on the side of the end surface 50d in the X direction is curved in an arc shape toward the side of the surface 50b in the Z direction. The wall portion 62f is curved in an arc so as to swell toward the end face 50d in the X direction, and is smoothly connected to the tip of the wall portion 62e. The wall portion 62g is curved in an arc so as to swell toward the surface 50b in the Z direction, and is smoothly connected to the tip of the wall portion 62f on the side of the surface 50b in the Z direction. The wall portion 62h is curved in an arc so as to be smoothly connected to the tip of the wall portion 62g on the side of the end surface 50c in the X direction. The engagement and disengagement between the first claw portion 61A and the second claw portion 62A are performed in the same manner as in the conductive plate 5 according to the above embodiment. Even with such a form, the same effect as that of the conductive plate 5 can be obtained.

FIG. 8 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate 5B shown in FIG. In a conductive plate 5C shown in FIG. 8, a second claw portion 62A is provided on an end surface 50d of a first plate member 51 in place of the first claw portion 61A. A first claw portion 61A is provided on the end surface 50c in place of the second claw portion 62A. Therefore, in the conductive plate 5C, the second claw portions 62A are provided on both the end surface 50c and the end surface 50d of the first plate-like member 51, and the end surfaces 50c and 50d of the second plate-like member 52 are provided with the second claw portions 62A. A first claw portion 61A is provided on both sides. Even with such a form, the same effect as that of the conductive plate 5B can be obtained. In the conductive plate 5C, the first claw portions 61A may be provided on both the end surface 50c and the end surface 50d of the first plate-like member 51, and the end surfaces 50c and 50d of the second plate-like member 52 may be provided with the first claw portions 61A. 62A of 2nd nail|claw parts may each be provided in both sides. Alternatively, in each plate member 50 of the conductive plate 5C, the second claw portion 62A may be provided on each end face 50d, and the first claw portion 61A may be provided on each end face 50c.

FIG. 9 is an enlarged cross-sectional view of a main part showing still another embodiment of the conductive plate 5. As shown in FIG. A conductive plate 5D shown in FIG. The connecting portion 60B has a convex portion 61B instead of the first claw portion 61, and a concave portion 62B instead of the second claw portion 62. As shown in FIG. The convex portion 61B extends from one end in the Y direction to the other end of the end face 50d of the first plate member 51, and has the same XZ cross-sectional shape from one end to the other end in the Y direction of the end face 50d. there is That is, the XZ cross-sectional shape of the convex portion 61B is uniform in the Y direction. The XZ cross section of the convex portion 61B has, for example, an arrow shape projecting in the X direction from the end surface 50d of the first plate-like member 51 toward the end surface 50c of the second plate-like member 52. As shown in FIG.

The convex portion 61B extends linearly along the X direction from the central portion of the end surface 50d of the first plate member 51 in the Z direction toward the end surface 50c of the second plate member 52. , and a head portion 61j projecting from the tip of the shaft portion 61i on the side of the end face 50c to both sides in the Z direction. The head 61j has a triangular shape with one of its vertices (tip) directed toward the end face 50c in the X direction in the XZ cross section. The head 61j includes a pair of stepped surfaces 61k projecting from the tip of the shaft portion 61i on both sides in the Z direction, and two sides connected to the pair of stepped surfaces 61k and forming the vertices of the head 61j. and a pair of inclined surfaces 61m.

The pair of stepped surfaces 61k are formed along the YZ plane and substantially perpendicular to the shaft portion 61i. The pair of inclined surfaces 61m are inclined with respect to the XY plane and the YZ plane, and are inclined so that the distance between them in the Z direction decreases as they approach the end surface 50c in the X direction. One inclined surface 61m connects one end of one stepped surface 61k on the surface 50a side in the Z direction and the tip of the head 61j. The other inclined surface 61m connects one end of the other stepped surface 61k on the surface 50b side in the Z direction and the tip of the head 61j.

The concave portion 62B extends from one end in the Y direction to the other end of the end face 50c of the second plate member 52, and has the same XZ cross-sectional shape from one end to the other end in the Y direction of the end face 50c. . That is, the XZ cross-sectional shape of the concave portion 62B is uniform in the Y direction. The concave portion 62B is fitted with the convex portion 61B from one end to the other end in the Y direction of the end face 50c. The concave portion 62B is formed by a pair of wall portions 62i projecting in the X direction from both end portions of the end surface 50c in the Z direction, and the tips of the pair of wall portions 62i on the side of the end surface 50d so as to approach each other in the Z direction. and a pair of overhanging wall portions 62j. The head 61j of the projection 61B is arranged in the internal space of the recess 62B surrounded by the end face 50c of the second plate member 52, the pair of walls 62i, and the pair of walls 62j. A pair of stepped surfaces 61k of the head 61j face a pair of walls 62j of the recess 62B in the X direction. A shaft portion 61i of the convex portion 61B is arranged between a pair of wall portions 62j in the Z direction.

A gap in the X direction and the Z direction is formed in the connecting portion 60B constituted by the convex portion 61B and the concave portion 62B. The gap in the X direction is, for example, the gap between the end surface 50d of the first plate-like member 51 and the wall 62j of the recess 62B, the gap between the wall 62j and the stepped surface 61k of the head 61j of the protrusion 61B, the head This is the gap between the inclined surface 61m of the portion 61j and the end surface 50c of the second plate member 52. FIG. The gap in the Z direction is, for example, the gap between the shaft portion 61i of the convex portion 61B and the wall portion 62j of the concave portion 62B, and the gap between the head portion 61j of the convex portion 61B and the wall portion 62i of the concave portion 62B. These gaps extend from the end face 50e to the end face 50f of the plate member 50 along the Y direction. Since the cooling fluid F (see FIGS. 3 and 4) flows along the Y direction as described above, these gaps extending along the Y direction can be used as flow paths for the cooling fluid F. can be done.

When the first plate-like member 51 and the second plate-like member 52 are moved relative to each other in the X direction, the pair of walls 62j of the concave portion 62B are separated from the end face 50d of the first plate-like member 51 in the X direction. It moves by the gap and comes into contact with the end surface 50d, or moves by the gap in the X direction between the pair of stepped surfaces 61k of the projection 61B and comes into contact with the pair of stepped surfaces 61k. This abutment restricts the relative movement of the first plate member 51 and the second plate member 52 in the X direction. Therefore, the pair of wall portions 62j and the pair of stepped surfaces 61k form a restricting portion that restricts the relative movement of the first plate-like member 51 and the second plate-like member 52 in the X direction.

When the first plate-like member 51 and the second plate-like member 52 are relatively moved in the Z direction, the shaft portion 61i of the convex portion 61B moves by a gap in the Z direction between one wall portion 62j of the concave portion 62B. It moves and contacts one wall portion 62j, or moves by the gap in the Z direction from the other wall portion 62j of the convex portion 61B and contacts the other wall portion 62j. This abutment restricts the relative movement of the first plate member 51 and the second plate member 52 in the Z direction. Therefore, the shaft portion 61i and the pair of wall portions 62j constitute a restricting portion that restricts the relative movement of the first plate-like member 51 and the second plate-like member 52 in the Z direction.

When the first plate-like member 51 and the second plate-like member 52 are relatively moved in the Y direction, the XZ cross-sectional shapes of the convex portion 61B and the concave portion 62B are uniform in the Y direction. The portion 61B and the recessed portion 62B slide in the Y direction without coming into contact with each other. That is, the convex portion 61B and the concave portion 62B are relatively movable in the Y direction. Also, the relative positions of the convex portion 61B and the concave portion 62B in the direction around the center of rotation are slightly movable. In the conductive plate 5B, the center of rotation is, for example, the tip of the wall portion 62j of the recess 62B. A gap is formed between the shaft portion 61i of the convex portion 61B and the wall portion 62j of the concave portion 62B, thereby allowing the convex portion 61B and the concave portion 62B to rotate about the tip of the wall portion 62j. ing.

The fitting between the convex portion 61B and the concave portion 62B is performed by relatively moving the convex portion 61B and the concave portion 62B in the X direction. FIG. 10(a) is a schematic cross-sectional view showing a state before connection of the conductive plate 5D. When fitting the convex portion 61B into the concave portion 62B, first, the first plate-like member 51 and the second plate-like member 52 are arranged along the X direction, and the end surface 50d of the first plate-like member 51 is The provided convex portion 61B and the concave portion 62B provided on the end surface 50c of the second plate-like member 52 face each other. After that, the first plate-like member 51 and the second plate-like member 52 are brought closer to each other along the X direction, and the head portion 61j of the convex portion 61B is inserted into the internal space of the concave portion 62B.

FIG. 10(b) is a schematic cross-sectional view showing the state after the connection of the conductive plate 5D. When the head 61j of the projection 61B is inserted into the recess 62B, the pair of inclined surfaces 61m of the head 61j abut against the pair of walls 62j of the recess 62B in the X direction. When each inclined surface 61m abuts against each wall portion 62j, a reaction force is applied from each inclined surface 61m to each wall portion 62j. expanded. At this time, each wall portion 62j slides along each inclined surface 61m while being in contact with each inclined surface 61m. When each wall portion 62j climbs over each inclined surface 61m and reaches the shaft portion 61i of the convex portion 61B, the concave portion 62B elastically returns to its original shape, and each expanded wall portion 62j returns to its original position.

In this manner, the convex portion 61B fits into the concave portion 62B. That is, the head 61j of the projection 61B enters the recess 62B, and the head 61j is hooked on the pair of walls 62j of the recess 62B in the X direction. The fitting between the projection 61B and the recess 62B may be performed, for example, by sliding the projection 61B and the recess 62B in the Y direction. That is, the convex portion 61B and the concave portion 62B may be fitted in the concave portion 62B by relatively moving (approaching) the convex portion 61B and the concave portion 62B in the Y direction so as to slide each other from positions shifted from each other in the Y direction. . When releasing the engagement between the projection 61B and the recess 62B, the projection 61B and the recess 62B are slid away from each other in the Y direction from the fitted state of the projection 61B and the recess 62B. may be done.

According to the conductive plate 5</b>D, the same effects as the conductive plate 5 are obtained. Further, by forming the connecting portion 60B by fitting the convex portion 61B and the concave portion 62B, the connecting portion 60B can be simplified. Further, by relatively moving (approaching) the projection 61B and the recess 62B in the X direction, the projection 61B can be fitted into the recess 62B, so that the assembling efficiency of the conductive plate 5D can be sufficiently secured. In addition, by restricting the relative movement in the Z direction and the X direction between the first plate-like member 51 and the second plate-like member 52, the planar shape of the conductive plate 5D can be easily maintained. Therefore, the assembling workability of the power storage device including the conductive plate 5D can be sufficiently ensured. Furthermore, by restricting the relative movement in the X direction between the first plate-like member 51 and the second plate-like member 52, the first plate-like member 51 and the second plate-like member 52 are separated from each other. A gap is less likely to occur between the end face 50c and the end face 50d. Therefore, it is possible to more reliably prevent the contact surface of the power storage module 4 from entering between the plate members 50 .

FIG. 11 is an enlarged cross-sectional view of a main part showing a modification of the conductive plate 5D. In the conductive plate 5E shown in FIG. 11, the end face 50d of the first plate-like member 51 is provided with the recess 62B instead of the protrusion 61B, and the end face 50c of the second plate-like member 52 is provided with the recess 62B. A convex portion 61B is provided instead. Therefore, in the conductive plate 5E, recesses 62B are provided on both the end surfaces 50c and 50d of the first plate-like member 51, and projections 62B are provided on both the end surfaces 50c and 50d of the second plate-like member 52. 61B are provided respectively. Even with such a form, the same effect as that of the conductive plate 5D can be obtained. In addition, in the conductive plate 5E, both the end surface 50c and the end surface 50d of the first plate member 51 may be provided with the convex portions 61B, respectively, and the end surface 50c and the end surface 50d of the second plate member 52 may be A recess 62B may be provided respectively. Alternatively, in each plate-shaped member 50 of the conductive plate 5C, each end surface 50d may be provided with a recess 62B, and each end surface 50c may be provided with a protrusion 61B.

The present disclosure is capable of other various modifications. For example, the embodiments and modifications described above may be combined with each other according to the desired purpose and effect. Also, the configuration of the conductive plate is not limited to the above-described embodiments and modifications. For example, in each of the above-described embodiments and modifications, the plurality of plate-like members forming the conductive plate are arranged in the X direction along the longitudinal direction of the conductive plate. They may be arranged in the Y direction along the lateral direction of the plate. Also, the plurality of plate members may be arranged in the X direction along the longitudinal direction of the conductive plate and in the Y direction along the lateral direction of the conductive plate. In other words, the plurality of plate members may have a structure divided along each of the X direction and the Y direction. The shape of the plate member viewed from the Z direction is not limited to a rectangular shape, and may be another shape. Also, the configuration of the connecting portion is not limited to the above-described embodiments and modifications, and can take various forms. Although the present invention is applied to the conductive plates 5, 5A to 5E in each of the embodiments and modifications described above, the present invention may be applied to the conductive plate P as well.

In each of the embodiments and modifications described above, the outermost layers of the electrode stack are the negative terminal electrode and the positive terminal electrode. may be further laminated. In this case, the outermost metal plate has neither a positive electrode nor a negative electrode, and is electrically connected to the adjacent terminal electrode. By providing the outermost metal plate, it is possible to suppress the expansion of the electrode laminate when the internal pressure rises. In addition, by providing the metal plate on the outer layer side of the negative terminal electrode, it is possible to lengthen the traveling path of the electrolytic solution for alkaline creep, thereby suppressing leakage of the electrolytic solution.

REFERENCE SIGNS LIST 1 power storage device 4 power storage module 5, 5A, 5B, 5C, 5D, 5E conductive plate 5a through hole 5b, 5c long side 5d, 5e short side 11 electrode laminate, DESCRIPTION OF SYMBOLS 12... Sealing body (resin part), 14... Bipolar electrode, 15... Metal plate, 15a... One surface, 15b... Other surface, 18... Negative terminal electrode, 19... Positive terminal electrode, 50... Plate-like member, 50a, 50b... Surface 50c, 50d, 50e, 50f... End face 51... First plate-like member 52... Second plate-like member 60, 60A, 60B... Connecting part 61, 61A... First claw part , 61B... convex part, 62, 62A... second claw part, 62B... concave part, F... cooling fluid.

Claims (9)

A power storage device including a plurality of power storage modules stacked via conductive plates and electrically connected in series,
The power storage module has a plurality of electrodes stacked in a stacking direction of the power storage module and a resin portion covering edges of the plurality of electrodes,
The plurality of electrodes has a metal plate including one surface and the other surface facing each other, a bipolar electrode including a positive electrode provided on the one surface, and a negative electrode provided on the other surface,
The conductive plate is configured by rotatably connecting a plurality of plate-like members arranged in a first direction with a connecting portion, and is exposed from the resin portion at an end portion of the electricity storage module in the stacking direction. is in contact with exposed surfaces that
Among the plurality of plate-shaped members, a first plate-shaped member and a second plate-shaped member adjacent to each other in the first direction have connecting end surfaces facing each other,
The connecting portion extends from one end to the other end of the connecting end face in a second direction that intersects the first direction in a plan view of the first plate-like member and the second plate-like member. , storage device. The power storage device according to claim 1, wherein said conductive plate has a cooling mechanism for cooling said power storage module. The cooling mechanism includes a through hole for circulating a cooling fluid,
3. The power storage device according to claim 2, wherein said through-hole penetrates through said conductive plate in said second direction. The connection part is
a first claw portion provided on the connecting end surface of the first plate member and extending from the one end to the other end of the connecting end surface;
and a second pawl provided on the connecting end face of the second plate-like member and engaged with the first pawl from the one end to the other end of the connecting end face. 4. The power storage device according to any one of 1 to 3. The first claw portion and the second claw portion are arranged in the first direction and the stacking direction of the power storage modules between the first plate-like member and the second plate-like member in the engaged state. 5 . The power storage device according to claim 4 , each having a regulating portion for regulating relative movement to and from . The connection part is
a projection provided on the connecting end surface of the first plate member and extending from the one end to the other end of the connecting end surface;
4. The concave portion provided on the connecting end surface of the second plate-like member and fitted to the convex portion from the one end to the other end of the connecting end surface. The power storage device according to the item. The convex portion and the concave portion restrict relative movement of the power storage module between the first plate-like member and the second plate-like member in the stacking direction and the first direction in the fitted state. 7. The power storage device according to claim 6, each having a regulating portion. The conductive plate has a rectangular shape including long sides and short sides in plan view,
The power storage device according to any one of claims 1 to 7, wherein said first direction is along said long side of said conductive plate. The power storage device according to any one of claims 1 to 8, wherein the connecting portion has a uniform cross-sectional shape in the second direction.

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