JP7031429B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device.

As a conventional power storage device, for example, the technique described in Patent Document 1 is known. The power storage device described in Patent Document 1 is a collection of a plurality of bipolar secondary batteries (storage modules) in which a plurality of bipolar electrodes are laminated and a collection in which the bipolar secondary batteries are laminated between the bipolar secondary batteries and capable of cooling the bipolar secondary batteries. It is equipped with an electric plate (cooling plate).

Japanese Unexamined Patent Publication No. 2007-305425

However, when the cooling plate is laminated on the power storage module in this way, a positional shift may occur between the power storage module and the cooling plate. As a result, among the plurality of bipolar electrodes of the power storage module, the electrode plate of the bipolar electrode in contact with the cooling plate may be damaged.

An object of the present invention is to provide a power storage device capable of suppressing a misalignment between a power storage module and a cooling plate.

In the power storage device according to one aspect of the present invention, a plurality of bipolar electrodes having a positive electrode layer provided on one surface of the electrode plate and a negative electrode layer provided on the other surface of the electrode plate are laminated via a separator. It comprises a module and a conductive cooling plate that is laminated with respect to the power storage module and arranged in contact with the power storage module in the stacking direction of a plurality of bipolar electrodes, and is provided on one side in the stacking direction of the power storage module. At least one of the end portion and the other end portion is provided with a positioning portion that defines the position of the cooling plate with respect to the power storage module.

In this power storage device, at least one of one end and the other end in the stacking direction of the power storage modules is provided with a positioning unit that defines the position of the cooling plate with respect to the power storage module. By providing the positioning portion in this way, the cooling plate is fixed to the power storage module. Therefore, it is possible to suppress the positional deviation between the power storage module and the cooling plate.

The cooling plate is rectangular when viewed from the stacking direction, and the positioning portion may be provided at least at a position corresponding to a pair of diagonal corners of the cooling plate and may be L-shaped when viewed from the stacking direction. .. According to this configuration, since the volume of the positioning portion can be reduced, it is possible to suppress the misalignment between the power storage module and the cooling plate while reducing the material cost.

The cooling plate extends in a direction intersecting the stacking direction and is provided with a through hole through which the refrigerant flows, and the positioning portion is provided at a position corresponding to the side surface of the cooling plate along the direction in which the through hole extends. May be done. According to this configuration, since the positioning portion is provided at a position that does not interfere with the flow of the refrigerant, it is possible to suppress the positional deviation between the power storage module and the cooling plate without reducing the cooling capacity of the cooling plate.

The positioning unit may be provided on both one end and the other end of the power storage module. According to this configuration, since one cooling plate is fixed by the positioning portion of two adjacent power storage modules, the misalignment between the power storage module and the cooling plate can be suppressed more reliably.

The power storage device may include a plurality of power storage modules and cooling plates, the power storage modules and the cooling plates are alternately laminated, and the positioning unit may be provided only at one end of each power storage module. According to this configuration, since the positioning portion is not provided at the other end of each power storage module, the power storage module is arranged on the other side of the power storage module and is positioned by the positioning unit of another power storage module. It can absorb dimensional tolerances with the cooling plate. Therefore, the power storage module and the plurality of cooling plates can be easily laminated.

The positioning portion may protrude from one end of the power storage module in the stacking direction, and the other end of the power storage module may be provided with a recess corresponding to the positioning portion and the cooling plate. According to this configuration, the positioning portion of one power storage module can be fitted into the recess of another power storage module adjacent to each other on one side of one power storage module. Therefore, the positioning unit can position the adjacent power storage modules.

According to the present invention, there is provided a power storage device capable of suppressing a misalignment between a power storage module and a cooling plate.

It is a schematic sectional drawing which shows the power storage device which concerns on one Embodiment. It is a schematic sectional drawing which shows the power storage module included in the power storage device of FIG. It is the schematic sectional drawing which shows the positioning structure of the power storage module and the cooling plate of FIG. It is a figure which shows schematically the power storage module and the cooling plate seen from the stacking direction. It is a figure which shows the deformation example of the positioning part schematicly. It is the schematic sectional drawing which shows the other modification of the positioning part. It is a schematic cross-sectional view which shows the further modification example of the positioning part.

Hereinafter, various embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted. FIGS. 1 to 6 show an XYZ Cartesian coordinate system.

The power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage module 12 is, for example, a bipolar battery. In the following description, a nickel-metal hydride secondary battery will be exemplified as such a power storage module 12.

The plurality of power storage modules 12 are laminated via a cooling plate 14 such as a metal plate to form an array 11. The cooling plate 14 is arranged in contact with the power storage module. When viewed from the stacking direction (Z direction), the power storage module 12 and the cooling plate 14 have, for example, a rectangular shape. When viewed from the stacking direction, the cooling plate 14 is smaller than the power storage module 12. In other words, the cooling plate 14 is arranged in the region where the power storage module 12 is arranged when viewed from the stacking direction. The cooling plate 14 has conductivity and is electrically connected to the adjacent power storage modules 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction. The power storage module 12 is provided with a positioning unit 60 (see FIGS. 3 and 4) that defines the position of the cooling plate 14 with respect to the power storage module 12. The detailed configuration of the positioning unit 60 will be described later.

The cooling plates 14 are also arranged on the outside of the power storage modules 12 located at both ends in the stacking direction of the power storage modules 12. That is, the cooling plates 14 are also arranged at both ends of the array 11 in the stacking direction. In the stacking direction, the positive electrode terminal 24 is connected to the cooling plate 14 located at one end, and the negative electrode terminal 26 is connected to the cooling plate 14 located at the other end. The positive electrode terminal 24 and the negative electrode terminal 26 may be integrated with the cooling plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction. The positive electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

The cooling plate 14 can function as a heat sink for releasing the heat generated in the power storage module 12. Inside the cooling plate 14, a plurality of through holes 14H extending in the crossing direction (Y direction) intersecting the stacking direction are provided. The through hole 14H communicates from one end face facing each other in the crossing direction to the other end face. The through holes 14H are arranged in a direction (X direction) intersecting the stacking direction and the crossing direction. A refrigerant such as air is circulated through the through hole 14H. As a result, the heat generated in the power storage module 12 can be effectively released to the outside.

The power storage device 10 may include a restraint member 15 that restrains the power storage modules 12 and the cooling plates 14 that are alternately stacked in the stacking direction. The restraint member 15 includes a pair of restraint plates 16 and 17 and a connecting member (bolt 18 and nut 20) for connecting the restraint plates 16 and 17 to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16 and 17 and the cooling plate 14. Each of the restraint plates 16 and 17 is made of a metal such as iron, for example.

When viewed from the stacking direction, the restraint plates 16 and 17 and the insulating film 22 have, for example, a rectangular shape. The insulating film 22 is larger than the cooling plate 14, and the restraint plates 16 and 17 are larger than the power storage module 12. When viewed from the stacking direction, an insertion hole 16a through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16. Similarly, when viewed from the stacking direction, an insertion hole 17a through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 17. When the restraint plates 16 and 17 have a rectangular shape when viewed from the stacking direction, the insertion holes 16a and the insertion holes 17a are located at the corners of the restraint plates 16 and 17.

One restraint plate 16 is abutted against the cooling plate 14 connected to the negative electrode terminal 26 via the insulating film 22, and the other restraint plate 17 has the insulating film 22 attached to the cooling plate 14 connected to the positive electrode terminal 24. It is struck through. The bolt 18 is passed through the insertion hole 16a and the insertion hole 17a from one restraint plate 16 side toward the other restraint plate 17 side, and a nut 20 is attached to the tip of the bolt 18 protruding from the other restraint plate 17. Is screwed in. As a result, the insulating film 22, the cooling plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

As shown in FIG. 2, the power storage module 12 includes a laminated body 30 in which a plurality of bipolar electrodes 32 are laminated in one direction (stacking direction). When viewed from the stacking direction of the bipolar electrodes 32, the laminated body 30 has, for example, a rectangular shape. A separator 40 may be arranged between adjacent bipolar electrodes 32. The bipolar electrode 32 includes an electrode plate 34, a positive electrode layer 36 provided on one surface of the electrode plate 34, and a negative electrode layer 38 provided on the other surface of the electrode plate 34. In the laminated body 30, the positive electrode layer 36 of one bipolar electrode 32 faces the negative electrode layer 38 of one of the bipolar electrodes 32 adjacent to each other in the stacking direction with the separator 40 interposed therebetween, and the negative electrode layer 38 of one bipolar electrode 32 is formed. It faces the positive electrode layer 36 of the other bipolar electrode 32 adjacent to each other in the stacking direction with the separator 40 interposed therebetween.

In the stacking direction, an electrode plate 34 (negative electrode side terminal electrode) in which the negative electrode layer 38 is arranged on the inner side surface is arranged at one end of the laminated body 30, and the positive electrode layer 36 is arranged on the inner side surface at the other end of the laminated body 30. The electrode plate 34 (positive electrode side terminal electrode) on which the is arranged is arranged. The negative electrode layer 38 of the negative electrode side terminal electrode faces the positive electrode layer 36 of the uppermost bipolar electrode 32 via the separator 40. The positive electrode layer 36 of the positive electrode side terminal electrode faces the negative electrode layer 38 of the lowermost bipolar electrode 32 via the separator 40. The electrode plates 34 of these terminal electrodes are connected to adjacent cooling plates 14 (see FIG. 1).

The power storage module 12 includes a frame body 50 that holds the edge portion 34a of the electrode plate 34 on the side surface 30a of the laminated body 30 extending in the stacking direction of the bipolar electrode 32. The frame body 50 is configured to surround the side surface 30a of the laminated body 30. The frame 50 has, for example, a rectangular shape when viewed from the stacking direction of the bipolar electrodes 32. The frame body 50 has a first resin portion 52 that holds the edge portion 34a of the electrode plate 34, and a second resin portion 54 provided around the first resin portion 52 when viewed from the stacking direction.

The first resin portion 52 constituting the inner wall of the frame body 50 is provided from one surface of the electrode plate 34 of each bipolar electrode 32 (the surface on which the positive electrode layer 36 is formed) to the end surface of the electrode plate 34 in the edge portion 34a. There is. When viewed from the stacking direction of the bipolar electrodes 32, each first resin portion 52 is provided over the entire circumference of the edge portion 34a of the electrode plate 34 of each bipolar electrode 32. The adjacent first resin portions 52 are welded to each other on a surface extending to the outside of the other surface (the surface on which the negative electrode layer 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similar to the edge portion 34a of the electrode plate 34 of each bipolar electrode 32, the edge portions 34a of the electrode plates 34 arranged at both ends of the laminated body 30 are also held in a state of being embedded in the first resin portion 52. As a result, an internal space V airtightly partitioned by the electrode plates 34, 34 and the first resin portion 52 is formed between the electrode plates 34, 34 adjacent to each other in the stacking direction. The internal space V contains an electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution.

The second resin portion 54 constituting the outer wall of the frame body 50 is a tubular portion extending over the entire length of the laminated body 30 in the stacking direction of the bipolar electrode 32. The second resin portion 54 covers the outer surface of the first resin portion 52 extending in the stacking direction of the bipolar electrode 32. The second resin portion 54 is welded to the outer surface of the first resin portion 52 on the inner surface extending in the stacking direction of the bipolar electrode 32. The second resin portion 54 is formed into a rectangular cylinder shape, for example, by injection molding using an insulating resin.

The electrode plate 34 is, for example, a rectangular metal leaf made of nickel. The edge portion 34a of the electrode plate 34 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated, and the uncoated region constitutes the inner wall of the frame 50. It is an area that is buried and held in. Examples of the positive electrode active material constituting the positive electrode layer 36 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode layer 38 include a hydrogen storage alloy. The formation region of the negative electrode layer 38 on the other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode layer 36 on one surface of the electrode plate 34. The electrode plate 34 may be formed of a conductive resin.

The separator 40 is formed in the form of a sheet, for example. Examples of the material forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like, and a non-woven fabric. Is done. Further, the separator 40 may be reinforced with a vinylidene fluoride resin compound.

Examples of the resin material constituting the frame 50 (first resin portion 52 and second resin portion 54) include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

Next, with reference to FIGS. 3 and 4, the positioning structure of the power storage module 12 and the cooling plate 14 and the positioning unit 60 will be described in detail. The positioning unit 60 is provided at at least one of one end and the other end in the stacking direction of the power storage module 12, and fixes the position of the cooling plate 14. In the present embodiment, as shown in FIGS. 3 and 4, the positioning unit 60 is provided only on the end portion 12a of one side of each power storage module 12 (that is, the side that becomes the positive electrode of the power storage module 12). There is. The positioning portion 60 extends from the second resin portion 54 constituting the outer wall of the frame body 50 along a surface intersecting in the stacking direction, and is in contact with the cooling plate 14. The upper surface of the positioning portion 60 and the upper surface of the second resin portion 54 are flush with each other. In the present embodiment, the positioning portion 60 is integrally formed with the second resin portion 54 of the frame body 50, but the positioning portion 60 may be separate from the second resin portion 54. A recess O is formed at the end 12b on the other side of the power storage module 12 (that is, the side that becomes the negative electrode of the power storage module 12) by the opening of the second resin portion 54 that constitutes the outer wall of the frame body 50. The dimension of the recess O is larger than the dimension of the cooling plate 14 in the directions intersecting the stacking direction (X direction and Y direction).

As shown in FIG. 4, the cooling plate 14 has a rectangular shape when viewed from the stacking direction, and the positioning portion 60 is provided at a position corresponding to at least a pair of diagonal portions of the cooling plate 14. In the present embodiment, the positioning portion 60 is provided at a position corresponding to all the corner portions of the cooling plate 14. The positioning unit 60 fixes the cooling plate 14 so that, for example, the center of the power storage module 12 and the center of the cooling plate 14 when viewed from the stacking direction substantially coincide with each other. Although four positioning portions 60 are provided in the present embodiment, only two positioning portions 60 may be provided at positions corresponding to the pair of diagonal portions of the cooling plate 14.

Each positioning portion 60 intersects with the first extending portion 61 extending along the crossing direction (Y direction) in which the through hole 14H provided in the cooling plate 14 extends in the stacking direction and the crossing direction (X direction). It has a second extending portion 62 extending along the above, and is L-shaped when viewed from the stacking direction. The first extending portion 61 of each positioning portion 60 is in contact with the side surfaces 14a and 14b of the cooling plate 14 extending along the crossing direction (Y direction). Similarly, the second extending portion 62 of each positioning portion 60 is in contact with the side surfaces 14c and 14d of the cooling plate 14 extending along the direction (X direction) intersecting the stacking direction and the intersecting direction. The length L1 of the portion where the first extending portion 61 and the side surfaces 14a and 14b of the cooling plate 14 abut is the length L2 of the portion where the second extending portion 62 and the side surfaces 14c and 14d of the cooling plate 14 abut. Is longer than. In other words, the dimension of the second extending portion 62 extending in the X direction intersecting the extending direction of the through hole 14H is small. As a result, the positioning portion 60 hinders the flow of the refrigerant in the through hole 14H, and the cooling plate 14 suppresses the decrease in the cooling capacity.

The positioning portion 60 is formed together with the second resin portion 54 of the frame body 50 by injection molding using, for example, an insulating resin. As the resin material constituting the positioning portion 60, polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE) and the like can be used as in the frame body 50.

As described above, in the power storage device 10, the power storage module 12 is provided with a positioning unit 60 that defines the position of the cooling plate 14 with respect to the power storage module 12. By providing the positioning unit 60 in this way, the cooling plate 14 is fixed to the power storage module 12. Therefore, the misalignment between the power storage module 12 and the cooling plate 14 can be suppressed. As a result, it is possible to prevent the electrode plate 34 (positive electrode side terminal electrode) in contact with the cooling plate 14 from being damaged among the plurality of bipolar electrodes 32 of the power storage module 12.

Further, the cooling plate 14 is rectangular when viewed from the stacking direction, and the positioning portion 60 is provided at least at a position corresponding to a pair of diagonal corners of the cooling plate 14, and is L-shaped when viewed from the stacking direction. Is. As a result, the volume of the positioning unit 60 can be reduced, so that the positional deviation between the power storage module 12 and the cooling plate 14 can be suppressed while reducing the material cost.

Further, each positioning portion 60 has a first extending portion 61 extending in an intersecting direction intersecting the stacking direction and a second extending portion 62 extending in a direction intersecting the stacking direction and the intersecting direction. The length L1 of the portion where the extending portion 61 and the cooling plate 14 are in contact with each other is longer, and the length L2 of the portion where the second extending portion 62 and the cooling plate 14 are in contact with each other is longer. As a result, the size of the second extending portion 62 extending in the X direction intersecting the extending direction of the through hole 14H is reduced, so that the positioning portion 60 obstructs the flow of the refrigerant in the through hole 14H and the cooling plate. It is possible to suppress a decrease in the cooling capacity due to 14.

Further, the power storage device 10 includes a plurality of power storage modules 12 and cooling plates 14, respectively, and the power storage modules 12 and the cooling plates 14 are alternately laminated, and the positioning unit 60 is an end portion 12a on one side of each power storage module 12. It is provided only in. As described above, since the positioning portion 60 is not provided at the other end 12b of each power storage module 12, the power storage module 12 and the other side (end 12b side) of the power storage module 12 are arranged and the like. It is possible to absorb the dimensional tolerance with the cooling plate 14 positioned by the positioning unit 60 of the power storage module 12. Therefore, the plurality of power storage modules 12 and the plurality of cooling plates 14 can be easily laminated.

Next, the positioning unit 70 according to the modified example will be described with reference to FIG. Similar to the positioning unit 60, the positioning unit 70 is provided at the end portion 12a on one side of each power storage module 12 (that is, the side that becomes the positive electrode of the power storage module 12). The positioning portion 70 extends from the second resin portion 54 constituting the outer wall of the frame body 50 along a surface intersecting in the stacking direction, and is in contact with the cooling plate 14. The difference between the positioning unit 70 and the positioning unit 60 is that it corresponds to the side surfaces 14a and 14b of the cooling plate 14 along the direction in which the through hole 14H of the cooling plate 14 extends, not the diagonal corner portion of the cooling plate 14. It is a point provided at each position. In the example shown in FIG. 5, the positioning portion 70 has a rectangular shape extending along the crossing direction.

Also in the above modification, since the power storage module 12 is provided with the positioning unit 70 that defines the position of the cooling plate 14 with respect to the power storage module 12, the cooling plate 14 is fixed to the power storage module 12. Therefore, the misalignment between the power storage module 12 and the cooling plate 14 can be suppressed. As a result, it is possible to prevent the electrode plate 34 (positive electrode side terminal electrode) in contact with the cooling plate 14 from being damaged among the plurality of bipolar electrodes 32 of the power storage module 12.

Further, the positioning portion 70 is provided at a position corresponding to the side surfaces 14a and 14b of the cooling plate 14 along the crossing direction in which the through hole 14H extends. As a result, since the positioning portion 70 is provided at a position that does not interfere with the flow of the refrigerant, it is possible to suppress the positional deviation between the power storage module 12 and the cooling plate 14 without reducing the cooling capacity of the cooling plate 14. ..

Next, with reference to FIG. 6, the positioning unit 80 according to another modification will be described. Like the positioning unit 60 and the positioning unit 70, the positioning unit 80 is provided at the end portion 12a on one side of each power storage module 12 (that is, the side that becomes the positive electrode of the power storage module 12). The positioning portion 80 also extends from the second resin portion 54 constituting the outer wall of the frame body 50 along the surface intersecting in the stacking direction, and is in contact with the cooling plate 14. The positioning unit 80 differs from the positioning units 60 and 70 in that it protrudes from one end 12a of the power storage module 12 in the stacking direction. In the example shown in FIG. 5, the dimension of the positioning portion 70 in the stacking direction is substantially the same as the dimension of the cooling plate 14 in the stacking direction. That is, the upper surface of the positioning portion 60 and the upper surface of the cooling plate 14 are flush with each other. Further, the recess O provided in the other end portion 12b of the power storage module 12 corresponds to the positioning portion 80 and the cooling plate 14. That is, the dimensions of the recess O are substantially the same as the dimensions of the positioning portion 80 and the cooling plate 14 in the directions intersecting the stacking directions (X direction and Y direction).

The positioning unit 80 may be provided at a position corresponding to the corner portion of the cooling plate 14 and may be L-shaped, as in the case of the positioning unit 60, for example. Further, the positioning unit 80 is provided at positions corresponding to the side surfaces 14a and 14b of the cooling plate 14 along the direction in which the through hole 14H of the cooling plate 14 extends, respectively, and extends in the intersecting direction, like the positioning unit 70. It may be rectangular.

Also in the other modification described above, since the power storage module 12 is provided with the positioning unit 80 that defines the position of the cooling plate 14 with respect to the power storage module 12, the cooling plate 14 is fixed to the power storage module 12. Therefore, the misalignment between the power storage module 12 and the cooling plate 14 can be suppressed. As a result, it is possible to prevent the electrode plate 34 (positive electrode side terminal electrode) in contact with the cooling plate 14 from being damaged among the plurality of bipolar electrodes 32 of the power storage module 12.

Further, a recess O corresponding to the positioning portion 80 and the cooling plate 14 is provided at the end portion 12b on the other side of the power storage module 12, which protrudes from the end portion 12a on one side of the power storage module 12 in the stacking direction. As a result, the positioning portion 80 of one power storage module 12 can be fitted into the recess O of another power storage module 12 adjacent to each other on one side of one power storage module 12 (that is, the side that becomes the positive electrode of the power storage module 12). be. Therefore, the positioning unit 80 can position the adjacent power storage modules 12 to each other.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in the above embodiment, the example in which the positioning unit 60 is provided only on one end 12a of the power storage module 12 has been described, but the positioning unit 60 has only the other end 12b of the power storage module 12. It may be provided in. Further, as shown in FIG. 7, the positioning unit 60 may be provided on both the one-side end portion 12a and the other-side end portion 12b of the power storage module 12. In this case, since one cooling plate 14 is fixed by the positioning portions 60 of the two adjacent power storage modules 12, the misalignment between the power storage module 12 and the cooling plate 14 can be more reliably suppressed.

Further, in the above embodiment, an example in which the shape of the positioning portion viewed from the stacking direction is L-shaped or rectangular has been described, but the shape of the positioning portion and the position where the positioning portion is provided are not particularly limited. It can be changed as appropriate. For example, the positioning portion may have a rectangular frame shape having an opening corresponding to the cooling plate 14 when viewed from the stacking direction. That is, the positioning portion may be in contact with the entire surface of the side surfaces 14a, 14b, 14c, 14d of the cooling plate 14 so as not to completely block the through hole 14H. In this case, since the entire surface of the laminated body 30 is covered by the positioning portion, the frame body 50, and the cooling plate 14, deformation of the power storage module 12 can be suppressed even when the internal pressure of the laminated body 30 rises, for example. can.

Further, in the above embodiment, the side surface 14a of the cooling plate 14 is located at a position corresponding to the diagonal corner portion of the cooling plate 14 or along the crossing direction (Y direction) in which the through hole 14H of the cooling plate 14 extends. Although an example in which the positioning portion is provided at the position corresponding to, 14b has been described, the positioning portion corresponds to the side surfaces 14c and 14d of the cooling plate 14 along the direction (X direction) intersecting the stacking direction and the crossing direction. The through hole 14H may be provided so as not to completely block the through hole 14H.

Further, in the above embodiment, the example in which the power storage device 10 includes a plurality of power storage modules 12 has been described, but the power storage device 10 may include only one power storage module 12. In this case as well, the positioning unit 60 may be provided only on one end portion 12a of the power storage module 12, or on both the one side end portion 12a and the other side end portion 12b of the power storage module 12. It may be provided.

Further, in the above embodiment, an example in which the positioning portion is formed together with the second resin portion 54 by injection molding has been described, but the positioning portion may be formed separately from the second resin portion 54 and attached to the power storage module 12. good.

Further, in the above embodiment, the example in which the cooling plate 14 has the through hole 14H has been described, but the cooling plate 14 does not have to have the through hole 14H.

Further, in the above embodiment, the example in which the power storage device 10 is a nickel hydrogen secondary battery has been described, but the power storage device 10 may be a lithium ion secondary battery. In this case, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur or the like. The negative electrode active material is, for example, graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, carbon such as soft carbon, alkali metals such as lithium and sodium, metal compounds, SiO _x (0.5 ≦ x ≦ 1.5). ) And other metal oxides, boron-added carbon, etc.

10 ... power storage device, 12 ... power storage module, 12a, 12b ... end, 14 ... cooling plate, 14H ... through hole, 14a, 14b, 14c, 14d ... side surface, 30 ... laminated body, 32 ... bipolar electrode, 34 ... electrode Plate, 36 ... Positive electrode layer, 38 ... Negative electrode layer, 40 ... Separator, 60, 70, 80 ... Positioning part, O ... Recess.

Claims (6)

A power storage module in which a plurality of bipolar electrodes having a positive electrode layer provided on one surface of the electrode plate and a negative electrode layer provided on the other surface of the electrode plate are laminated via a separator.
In the stacking direction of the plurality of bipolar electrodes, a cooling plate having conductivity, which is laminated with respect to the power storage module and arranged in contact with the power storage module, is provided.
A power storage device provided with a positioning unit that defines the position of the cooling plate with respect to the power storage module at at least one of one end and the other end of the power storage module in the stacking direction. The cooling plate has a rectangular shape when viewed from the stacking direction.
The power storage device according to claim 1, wherein the positioning portion is provided at least at a position corresponding to a pair of diagonal portions of the cooling plate and is L-shaped when viewed from the stacking direction. The cooling plate is provided with a through hole extending in a direction intersecting the stacking direction and through which a refrigerant flows.
The power storage device according to claim 1, wherein the positioning portion is provided at a position corresponding to a side surface of the cooling plate along a direction in which the through hole extends. The power storage device according to any one of claims 1 to 3, wherein the positioning unit is provided on both the one-sided end portion and the other-side end portion of the power storage module. A plurality of the storage module and the cooling plate are provided, respectively.
The power storage module and the cooling plate are alternately laminated.
The power storage device according to any one of claims 1 to 3, wherein the positioning unit is provided only at one end of the power storage module on one side. The positioning portion projects from the one-sided end of the power storage module in the stacking direction.
The power storage device according to claim 5, wherein a recess corresponding to the positioning portion and the cooling plate is provided at the other end of the power storage module.

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