JP7093315B2 - Power storage device - Google Patents

Description

One aspect of the present invention relates to a power storage device.

A plurality of stacked power storage modules, a conductor arranged outside the power storage modules located at both ends in the stacking direction of the power storage modules, a pair of restraint plates for restraining the plurality of power storage modules in the stacking direction, and a conductor. A power storage device including an insulating film arranged between a and a restraint plate is known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-101489

In the power storage device, the insulating film and the conductor are held so as not to move in the direction intersecting the stacking direction due to the frictional force due to the load of the restraint plate. However, when a large external force such as vibration or impact is applied to the power storage device, the insulating film and the conductor may shift in the direction intersecting the stacking direction.

One aspect of the present invention is to provide a power storage device capable of suppressing a misalignment of at least one of a current collector plate, an insulating plate and a restraining plate in a direction intersecting the stacking direction.

The power storage device according to one aspect of the present invention is arranged at the end of the plurality of power storage modules stacked in the first direction and the plurality of stacked power storage modules in the first direction, and is said in the first direction. A restraint plate that applies a restraint load to a plurality of power storage modules, a current collector plate that is arranged between the restraint plate and the plurality of power storage modules and electrically connected to the plurality of power storage modules, and the restraint plate. The collector plate is provided with an insulating plate arranged between the collector plate and the current collector plate, and at least one of the current collector plate, the insulating plate, and the restraining plate intersects the first direction with the collecting plate in the second direction. It has a positioning unit for positioning at least one of the positioning between the electric plate and the insulating plate and the positioning between the insulating plate and the restraining plate in the second direction.

In the above-mentioned power storage device, for example, when positioning between the current collector plate and the insulating plate in the second direction is performed, the positioning unit can suppress the positional deviation between the current collector plate and the insulating plate in the second direction. Similarly, for example, when positioning between the insulating plate and the restraining plate in the second direction is performed, the positioning portion can suppress the positional deviation between the insulating plate and the restraining plate in the second direction. Therefore, in the power storage device, the misalignment of at least one of the current collector plate, the insulating plate, and the restraining plate can be suppressed in the second direction.

At least one of the current collector plate and the insulating plate may have a first positioning portion for positioning between the current collector plate and the insulating plate in the second direction. In this case, the first positioning unit can suppress the positional deviation between the current collector plate and the insulating plate in the second direction.

The insulating plate may have the first positioning portion, and the first positioning portion may be a convex portion. In this case, since it is not necessary to provide the first positioning portion on the current collector plate, the degree of freedom in designing the shape of the current collector plate is improved.

At least one of the current collector plate and the insulating plate may have a regulating unit that regulates relative movement between the current collecting plate and the insulating plate in the first direction. In this case, even if the current collector plate is located below the insulating plate in the vertical direction, it is possible to prevent the current collector plate from falling away from the insulating plate.

At least one of the insulating plate and the restraining plate may have a second positioning portion for positioning between the insulating plate and the restraining plate in the second direction. In this case, the second positioning portion can suppress the positional deviation between the insulating plate and the restraining plate in the second direction.

At least one of the insulating plate and the restraining plate may have a regulating portion that regulates the relative movement between the insulating plate and the restraining plate in the first direction. In this case, even if the insulating plate is located below the restraining plate in the vertical direction, it is possible to prevent the insulating plate from falling away from the restraining plate.

According to one aspect of the present invention, there may be provided a power storage device capable of suppressing a misalignment of at least one of a current collector plate, an insulating plate and a restraining plate in a direction intersecting the stacking direction.

It is a schematic partial sectional view which shows the power storage device which concerns on one Embodiment. It is schematic cross-sectional view which shows the internal structure of the power storage module included in the power storage device shown in FIG. 1. It is a top view which shows a part of the power storage device shown in FIG. FIG. 3 is a cross-sectional view taken along the line IV-IV shown in FIG. It is sectional drawing along the VV line shown in FIG. It is a schematic partial sectional view which shows the power storage device which concerns on the 1st modification. It is a schematic partial sectional view which shows the power storage device which concerns on the 2nd modification. It is a schematic partial sectional view which shows the power storage device which concerns on 3rd modification. It is a schematic partial sectional view which shows the power storage device which concerns on 4th modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted.

FIG. 1 is a schematic cross-sectional view showing a power storage device according to an embodiment. The 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 power storage module stack 2 including a plurality of power storage modules 4 stacked in the stacking direction D1 (first direction), and a restraint device 3 that applies a restraining load to the power storage module stack 2 in the stacking direction D1. To prepare for.

The power storage module stack 2 is composed of a plurality of (three in this embodiment) power storage modules 4 and a plurality of (two in this embodiment) conductive plates 5. The power storage module 4 is, for example, a bipolar battery provided with a bipolar electrode 14 described later, and has a rectangular shape when viewed from the stacking direction D1. 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 will be illustrated.

The storage modules 4 adjacent to each other in the stacking direction D1 are electrically connected to each other via the conductive plate 5. Each conductive plate 5 is arranged between storage modules 4 adjacent to each other in the stacking direction.

Inside each conductive plate 5, a plurality of flow paths 5a through which a refrigerant such as air flows are provided. Each flow path 5a extends parallel to each other in, for example, a direction D3 (see FIG. 3) that intersects (for example, is orthogonal to) the stacking direction D1 and the extending direction D2 of the positive electrode terminal 6b and the negative electrode terminal 7b, which will be described later. ing. By circulating the refrigerant through these flow paths 5a, the conductive plate 5 not only functions as a connecting member for electrically connecting the storage modules 4 to each other, but also serves as a heat sink that dissipates heat generated by the storage modules 4. It also has a function. In the example of FIG. 1, the area of the conductive plate 5 seen from the stacking direction D1 is smaller than the area of the power storage module 4, but from the viewpoint of improving heat dissipation, the area of the conductive plate 5 is the area of the power storage module 4. It may be the same as the area, or may be larger than the area of the power storage module 4.

The restraint device 3 is composed of a pair of restraint plates 8 that sandwich the power storage module laminate 2 in the stacking direction, and fastening bolts 9 and nuts 10 that fasten the restraint plates 8 to each other. Each restraint plate 8 is arranged at an end (one end or the other end) of the plurality of power storage modules 4 in the stacking direction D1 and applies a restraint load to the plurality of power storage modules 4 in the stacking direction D1. Each restraint plate 8 is a rectangular metal plate having an area one size larger than the area of the power storage module 4 and the conductive plate 5 as seen from the stacking direction D1. The metal plate is made of, for example, aluminum or the like.

An insertion hole 8a is provided at the edge of the restraint plate 8 at a position outside the power storage module laminated body 2. The fastening bolt 9 is passed from the insertion hole 8a of one restraint plate 8 toward the insertion hole 8a of the other restraint plate 8, and is attached to the tip portion of the fastening bolt 9 protruding from the insertion hole 8a of the other restraint plate 8. , The nut 10 is screwed. As a result, the power storage module 4 and the conductive plate 5 are sandwiched by the restraint plate 8 to be unitized as the power storage module stack 2, and a restraint load is applied to the power storage module stack 2 in the stacking direction D1.

A current collector plate 6 electrically connected to the plurality of power storage modules 4 is arranged between one of the restraint plates 8 and the plurality of power storage modules 4. The current collector plate 6 is connected to a power storage module 4 located at one end in the stacking direction D1. The current collector plate 6 has a positive electrode terminal 6b extending in a direction D2 intersecting (for example, orthogonal to) the stacking direction D1. The current collector plate 6 is made of, for example, aluminum or the like. An insulating plate F is arranged between the restraint plate 8 and the current collector plate 6. The insulating plate F suppresses a short circuit between the restraining plate 8 and the current collector plate 6. The insulating plate F is made of a resin material having strong alkali resistance such as polypropylene (PP). The thickness of the insulating plate F is, for example, 1 to 2 mm.

A current collector plate 7 electrically connected to the plurality of power storage modules 4 is arranged between the other restraint plate 8 and the plurality of power storage modules 4. The current collector plate 7 is connected to the power storage module 4 located at the other end in the stacking direction D1. The current collector plate 7 has a negative electrode terminal 7b extending in the direction D2 intersecting the stacking direction D1. The current collector plate 7 is made of, for example, aluminum or the like. An insulating plate F is arranged between the restraint plate 8 and the current collector plate 7. The insulating plate F suppresses a short circuit between the restraining plate 8 and the current collector plate 7. The positive electrode terminal 6b and the negative electrode terminal 7b charge and discharge the power storage device 1.

Next, the configuration of the power storage module 4 will be described in more detail. FIG. 2 is a schematic cross-sectional view showing an internal configuration of a power storage module included in the power storage device shown in FIG. As shown in the figure, the power storage module 4 includes an electrode laminated body 11 and a resin sealing member 12 surrounding the electrode laminated body 11. The electrode laminate 11 and the sealing member 12 are sealed.

The electrode laminate 11 includes a plurality of electrodes E laminated in the stacking direction D1 via the separator 13. The plurality of electrodes E include a plurality of bipolar electrodes 14, a negative electrode termination electrode 18, and a positive electrode termination electrode 19. In this example, the stacking direction D1 of the electrode laminated body 11 coincides with the stacking direction D1 of the power storage module laminated body 2. The bipolar electrode 14 includes an electrode plate 15, a positive electrode 16 provided on one surface 15a of the electrode plate 15, and a negative electrode 17 provided on the other surface 15b of the electrode plate 15. The positive electrode 16 is a positive electrode active material layer coated with a positive electrode active material. The negative electrode 17 is a negative electrode active material layer coated with a negative electrode active material. In the electrode laminate 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of one of the bipolar electrodes 14 adjacent to the stacking direction D1 with the separator 13 interposed therebetween. In the electrode laminate 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of the other bipolar electrode 14 adjacent to the stacking direction D1 with the separator 13 interposed therebetween.

In the electrode laminate 11, the negative electrode termination electrode 18 is arranged at one end of the stacking direction D1, and the positive electrode termination electrode 19 is arranged at the other end of the stacking direction D1. The negative electrode terminal electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the other surface 15b of the electrode plate 15. The negative electrode 17 of the negative electrode terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction D1 via the separator 13. One conductive plate 5 adjacent to the power storage module 4 is in contact with one surface 15a of the electrode plate 15 of the negative electrode terminal electrode 18. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on one surface 15a of the electrode plate 15. The other conductive plate 5 adjacent to the power storage module 4 is in contact with the other surface 15b of the electrode plate 15 of the positive electrode terminal electrode 19. The positive electrode 16 of the positive electrode terminal electrode 19 faces the negative electrode 17 of the bipolar electrode 14 at the other end of the stacking direction D1 via the separator 13.

The electrode plate 15 is made of metal and is made of, for example, nickel or a nickel-plated steel plate. The electrode plate 15 is a rectangular metal leaf made of, for example, nickel. The peripheral edge portion 15c of the electrode plate 15 (peripheral portion of the bipolar electrode 14) has a rectangular frame shape, and is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated. Examples of the positive electrode active material constituting the positive electrode 16 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 17 include a hydrogen storage alloy. In the present embodiment, the formation region of the negative electrode 17 on the other surface 15b of the electrode plate 15 is slightly larger than the formation region of the positive electrode 16 on the one surface 15a of the electrode plate 15.

The separator 13 is formed, for example, in the form of a sheet. Examples of the separator 13 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene, methyl cellulose and the like, or a non-woven fabric. The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 is not limited to a sheet shape, and a bag shape may be used.

The seal member 12 is formed in a rectangular frame shape by, for example, an insulating resin. Examples of the resin material constituting the sealing member 12 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like. The seal member 12 is configured to surround the electrode laminate 11 and hold peripheral portions 15c of the plurality of electrode plates 15.

The seal member 12 has a primary seal 21 provided on the peripheral edge portion 15c and a secondary seal 22 provided around the primary seal 21. The primary seal 21 is a film having a predetermined thickness (length in the stacking direction D1). The primary seal 21 has a rectangular frame shape when viewed from the stacking direction D1, and is continuously welded over the entire circumference of the peripheral edge portion 15c by, for example, ultrasonic waves or heat. The primary seal 21 is provided on the peripheral edge portion 15c on the other side surface 15b side of the electrode plate 15. The primary seal 21 is provided on the peripheral edge portion 15c in a state where the peripheral edge portion 15c is embedded, and covers the end surface of the electrode plate 15. The primary seal 21 is provided apart from the positive electrode 16 and the negative electrode 17 when viewed from the stacking direction D1. The primary seals 21 adjacent to each other in the stacking direction D1 are in contact with each other.

The primary seal 21 has a first portion 21a and a second portion 21b. The first portion 21a is provided on the other surface 15b and overlaps with the electrode plate 15 when viewed from the stacking direction D1. The second portion 21b is integrally formed with the first portion 21a and is provided on the outside of the electrode plate 15 when viewed from the stacking direction D1. The thickness of the first portion 21a is thinner than the thickness of the second portion 21b and is equal to or greater than the thickness of the negative electrode 17. A stepped surface 21c extending in the stacking direction D1 is formed between the first portion 21a and the second portion 21b.

An outer edge portion of the separator 13 is arranged on the upper surface of the first portion 21a. Seen from the stacking direction D1, the first portion 21a and the outer edge portion of the separator 13 overlap each other. The outer edge portion of the separator 13 is fixed to the upper surface of the first portion 21a at a plurality of locations arranged along the outer edge of the separator 13, for example, by welding. The outer edge of the separator 13 may be in contact with the stepped surface 21c or may be separated from the stepped surface 21c. In the present embodiment, the height of the stepped surface 21c (the length in the stacking direction D1) is equal to or greater than the sum of the thickness of the separator 13 and the thickness of the positive electrode 16.

The secondary seal 22 is provided on the outside of the electrode laminate 11 and the primary seal 21, and constitutes an outer wall (housing) of the power storage module 4. The secondary seal 22 is formed, for example, by injection molding of a resin as described later, and extends over the entire length of the electrode laminate 11 in the stacking direction D1. The secondary seal 22 is a tubular portion extending with the stacking direction D1 as the axial direction. The secondary seal 22 covers the outer surface of the primary seal 21 extending in the stacking direction D1. The secondary seal 22 is joined to the outer surface of the primary seal 21 and seals the outer surface of the primary seal 21. The secondary seal 22 is welded to the outer surface of the primary seal 21 by, for example, heat during injection molding. The secondary seal 22 may be welded to the outer surface of the primary seal 21 by hot plate welding. The resin material constituting the primary seal 21 and the resin material constituting the secondary seal 22 are compatible with each other. The primary seal 21 is made of, for example, PP, and the secondary seal 22 is made of, for example, modified PPE.

A plurality of internal spaces V are provided in the electrode laminate 11. Each internal space V is provided between a plurality of adjacent electrodes E. The internal space V is a space airtightly and watertightly partitioned by the electrode plate 15 and the sealing member 12 between the electrode plates 15 adjacent to each other in the stacking direction D1. An electrolytic solution (not shown) composed of an alkaline aqueous solution such as an aqueous solution of potassium hydroxide is housed in this internal space V. The electrolytic solution is impregnated in the separator 13, the positive electrode 16 and the negative electrode 17. Since the electrolytic solution is strongly alkaline, the sealing member 12 is made of a resin material having strong alkali resistance.

FIG. 3 is a plan view showing a part of the power storage device shown in FIG. FIG. 3 shows the restraint plate 8, the insulating plate F, and the current collector plate 6 as seen from the stacking direction D1. Hereinafter, the current collector plate 6 will be mainly described, but since the current collector plate 7 has the same configuration as the current collector plate 6, the same action and effect as the current collector plate 6 can be obtained for the current collector plate 7.

As shown in FIG. 3, each of the plurality of insertion holes 8a of the restraint plate 8 is provided at the four corners of the rectangular restraint plate 8 when viewed from the stacking direction D1. The restraint plate 8 has a long side along the direction D2 intersecting the stacking direction D1 and a short side along the direction D3 intersecting (for example, orthogonal to) both the stacking direction D1 and the direction D2. On the long side of the restraint plate 8, an insertion hole 8a is also provided between the two corners.

The current collector plate 6 includes a main body portion 6a connected to the power storage module 4, a positive electrode terminal 6b protruding from the edge of the main body portion 6a, and a protruding portion 6c protruding to the opposite side of the positive electrode terminal 6b. Each of the main body portion 6a, the positive electrode terminal 6b, and the protruding portion 6c has, for example, a rectangular shape when viewed from the stacking direction D1. The main surface of the main body 6a is a constraint surface that applies a constraint load to the power storage module 4. The positive electrode terminal 6b projects in the direction D2 from one edge of the main body 6a along the direction D3. The protruding portion 6c protrudes in the direction D2 from the other edge of the main body portion 6a along the direction D3. The positions of the positive electrode terminal 6b and the protruding portion 6c in the direction D3 are deviated from each other. The main surface of the positive electrode terminal 6b and the protruding portion 6c is an unconstrained surface. The tip of the positive electrode terminal 6b is located outside the edge of the restraint plate 8 in the direction D2 when viewed from the stacking direction D1. The tip of the protrusion 6c is located inside the edge of the restraint plate 8 in the direction D2 when viewed from the stacking direction D1.

The insulating plate F is opposite to the main body portion Fa arranged between the main body portion 6a and the restraint plate 8 of the current collector plate 6, the terminal support portion Fb protruding from the edge of the main body portion Fa, and the terminal support portion Fb. It is provided with a protruding portion Fc protruding to the side. The terminal support portion Fb supports the positive electrode terminal 6b. The protrusion Fc supports the protrusion 6c of the current collector plate 6. Each of the main body portion Fa, the terminal support portion Fb, and the protruding portion Fc has, for example, a rectangular shape when viewed from the stacking direction D1. The terminal support portion Fb projects in the direction D2 from one edge of the main body portion Fa along the direction D3. The protruding portion Fc protrudes in the direction D2 from the other edge along the direction D3 of the main body portion Fa. When viewed from the stacking direction D1, the tip of the terminal support portion Fb is located outside the edge of the restraint plate 8 in the direction D2, but is located inside the tip of the positive electrode terminal 6b. Such a terminal support portion Fb maintains an appropriate insulation distance between the positive electrode terminal 6b and the restraint plate 8. The tip of the protrusion Fc is located inside the edge of the restraint plate 8 in the direction D2 when viewed from the stacking direction D1.

FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. As shown in FIGS. 3 and 4, the insulating plate F has a convex portion F1 for positioning between the current collector 6 and the insulating plate F in a direction intersecting the stacking direction D1 (for example, the directions D2 and D3). It has (first positioning unit). The convex portion F1 projects in the stacking direction D1 at the edge of the insulating plate F. The convex portion F1 is provided so as to surround a portion of the current collector plate 6 other than the tip portion of the positive electrode terminal 6b when viewed from the stacking direction D1. In this case, the convex portion F1 is a wall extending along the edge of the current collector plate 6. The current collector plate 6 is fitted into the space (concave portion) surrounded by the convex portion F1. The convex portion F1 may be provided only on the four corners of the current collector plate 6 or may be provided only on the four sides of the current collector plate 6 when viewed from the stacking direction D1. The convex portion F1 may be a positioning pin.

As shown in FIG. 4, the insulating plate F has a convex portion F2 (second positioning) for positioning between the insulating plate F and the restraining plate 8 in a direction intersecting the stacking direction D1 (for example, directions D2 and D3). Part). The convex portion F2 projects to the side opposite to the convex portion F1 in the stacking direction D1. The convex portions F2 are provided at the four corners of the current collector plate 6 when viewed from the stacking direction D1, but may be provided only at the two corners located diagonally. The shape of the convex portion F2 is a columnar shape such as a columnar shape, but other shapes may be used. The restraint plate 8 has a concave portion 8b (second positioning portion) fitted to the convex portion F2.

FIG. 5 is a cross-sectional view taken along the line VV shown in FIG. As shown in FIGS. 3 and 5, the insulating plate F has a pair of claw portions F3 and F4 (regulating portions) that regulate the relative movement between the current collector plate 6 and the insulating plate F in the stacking direction D1. .. Each claw portion F3 is located at the tip of a convex portion F1 provided on the terminal support portion Fb. The pair of claw portions F3 extend in the direction D3 so as to approach each other on the positive electrode terminal 6b of the current collector plate 6. In the cross section orthogonal to the direction D2, the claw portion F3 has, for example, a triangular cross-sectional shape. As a result, by pressing the positive electrode terminal 6b of the current collector plate 6 against the inclined surface of the claw portion F3 in the stacking direction D1, the positive electrode terminal 6b can be easily fitted between the convex portions F1 of the insulating plate F.

Each claw portion F4 is located at the tip of a convex portion F1 provided on the protruding portion Fc. The pair of claw portions F4 extend in the direction D3 so as to approach each other on the protruding portion 6c of the current collector plate 6. In the cross section orthogonal to the direction D2, the claw portion F4 has, for example, a triangular cross-sectional shape. As a result, by pressing the protruding portion 6c of the current collector plate 6 against the inclined surface of the claw portion F4 in the stacking direction D1, the protruding portion 6c can be easily fitted between the convex portions F1 of the insulating plate F.

As described above, in the power storage device 1, since the insulating plate F has the convex portion F1, the position between the current collector 6 and the insulating plate F in the direction intersecting the stacking direction D1 (for example, the directions D2 and D3). The deviation can be suppressed. Normally, the surface roughness of the current collector plate 6 is smaller than the surface roughness of the restraint plate 8, so that the interface between the current collector plate 6 and the insulating plate F is the interface between the restraining plate 8 and the insulating plate F. It is slippery compared to. Even in such a case, the convex portion F1 can suppress the positional deviation between the current collector plate 6 and the insulating plate F. Further, when the current collector plate 6 is attached to the insulating plate F for manufacturing the power storage device 1, the position of the current collector plate 6 and the insulating plate F can be quickly aligned. Further, when the insulating plate F has the convex portion F1, it is not necessary to provide the first positioning portion on the current collector plate 6, so that the degree of freedom in designing the shape of the current collector plate 6 is improved. Therefore, the flat plate-shaped current collector plate 6 obtained by punching can be used as it is.

When the insulating plate F has the claw portions F3 and F4, even if the current collecting plate 6 is located below the insulating plate F in the vertical direction, it is possible to prevent the current collecting plate 6 from falling away from the insulating plate F.

Further, when the insulating plate F has the convex portion F2, the positional deviation between the insulating plate F and the restraining plate 8 in the direction intersecting the stacking direction D1 (for example, the directions D2 and D3) can be suppressed. If the number of convex portions F2 arranged in the direction intersecting the stacking direction D1 (for example, the directions D2 and D3) is increased, or if the cross-sectional area of each convex portion F2 orthogonal to the stacking direction D1 is increased, the stacking direction D1 is obtained. Even if a large load in the intersecting direction is applied to the convex portion F2, the convex portion F2 is unlikely to be destroyed.

FIG. 6 is a schematic partial cross-sectional view showing a power storage device according to the first modification. The power storage device according to this modification has the same configuration as the power storage device 1 except that the restraint plate 108 and the insulating plate F10 shown in FIG. 6 are provided in place of the restraint plate 8 and the insulating plate F shown in FIG. .. The restraint plate 108 has the same configuration as the restraint plate 8 except that it has a convex portion 108b (second positioning portion) instead of the concave portion 8b. The insulating plate F10 has the same configuration as the insulating plate F except that it has a concave portion F12 (second positioning portion) instead of the convex portion F2. The convex portion 108b of the restraint plate 108 is fitted into the concave portion F12 of the insulating plate F10. The shape of the convex portion 108b may be a columnar shape such as a columnar shape, or may be another shape.

In this modification, since the convex portion 108b having higher rigidity than the convex portion F2 is used, even if a large load in the direction intersecting the stacking direction D1 is applied to the convex portion 108b, the convex portion 108b is destroyed. hard.

FIG. 7 is a schematic partial cross-sectional view showing the power storage device according to the second modification. The power storage device according to this modification is the power storage device of the first modification except that the restraint plate 208 and the insulation plate F20 shown in FIG. 7 are provided in place of the restraint plate 108 and the insulation plate F10 shown in FIG. It has the same configuration. The restraint plate 208 has the same configuration as the restraint plate 108 except that it has a convex portion 208b (second positioning portion) instead of the convex portion 108b. The insulating plate F20 has the same configuration as the insulating plate F10 except that it does not have the recess F12. The insulating plate F20 is fitted into the space (recessed portion) surrounded by the convex portion 208b of the restraint plate 208. The convex portion 208b is provided so as to surround the portion of the insulating plate F20 excluding the tip portion of the terminal support portion Fb when viewed from the stacking direction D1. In this case, the convex portion 208b is a wall extending along the edge of the insulating plate F20. The convex portion 208b may be provided only on the four corners of the insulating plate F20 or may be provided only on the four sides of the insulating plate F20 when viewed from the stacking direction D1. The convex portion 208b may be a positioning pin.

In this modification, the convex portion 208b is visible when the insulating plate F20 is fitted to the restraint plate 208, so that the work efficiency of the fitting is improved.

FIG. 8 is a schematic partial cross-sectional view showing a power storage device according to a third modification. The power storage device according to this modification has the same configuration as the power storage device 1 except that the restraint plate 308 and the insulating plate F30 shown in FIG. 8 are provided in place of the restraint plate 8 and the insulating plate F shown in FIG. .. The restraint plate 308 has the same configuration as the restraint plate 8 except that it has an opening 308b that penetrates the restraint plate 308 in the stacking direction D1 instead of the recess 8b. The insulating plate F30 has the same configuration as the insulating plate F except that it has a convex portion F32 instead of the convex portion F2. The convex portion F32 of the insulating plate F30 is fitted into the opening 308b of the restraining plate 308.

The convex portion F32 of the insulating plate F30 has, for example, a columnar base portion F321 (second positioning portion) and, for example, a tapered conical trapezoidal claw portion F322 (regulating portion). The outer diameter of the base portion F321 is smaller than the maximum outer diameter of the claw portion F322 (outer diameter of the bottom surface). The base portion F321 is located between the main body portion Fa and the claw portion F322. The base F321 has, for example, a cylindrical opening F321a. The claw portion F322 has, for example, a cylindrical opening F322a that communicates with the opening F321a.

The opening 308b of the restraint plate 308 has, for example, a cylindrical first portion 308b1 (second positioning portion) and, for example, a cylindrical second portion 308b2 having a diameter larger than the diameter of the first portion 308b1. The first portion 308b1 is located between the second portion 308b2 and the main body portion Fa of the insulating plate 30F. The base portion F321 of the convex portion F32 is fitted to the first portion 308b1. The base portion F321 positions the insulating plate F30 and the restraining plate 308 in a direction intersecting the stacking direction D1 (for example, the directions D2 and D3). The inner diameter of the first portion 308b1 is the same as the outer diameter of the base F321. In the second portion 308b2, the claw portion F322 of the convex portion F32 is arranged. The maximum outer diameter of the claw portion F322 is larger than the diameter of the first portion 308b1. Therefore, the claw portion F322 is prevented from falling out from the first portion 308b1. The claw portion F322 regulates the relative movement between the insulating plate F30 and the restraining plate 308 in the stacking direction D1. The minimum outer diameter of the claw portion F322 is equal to or smaller than the diameter of the first portion 308b1.

The convex portion F32 of the insulating plate F30 is fitted to the opening portion 308b of the restraining plate 308 as follows, for example. First, when the claw portion F322 of the convex portion F32 is inserted into the opening portion 308b, the inclined outer surface of the claw portion F322 is pressed by the inner surface of the opening portion 308b. As a result, the openings F321a and F322a are crushed. When the openings F321a and F322a are crushed, the maximum outer diameter of the claw portion F322 is equal to or less than the diameter of the first portion 308b1. As a result, the claw portion F322 passes through the opening portion 308b. After the claw portion F322 passes through the opening portion 308b, the openings F321a and F322a expand, and the claw portion F322 is arranged in the second portion 308b2.

In this modification, even if the insulating plate F30 is located below the restraining plate 308 in the vertical direction, the claw portion F322 can prevent the insulating plate F30 from falling away from the restraining plate 308. When the insulating plate F30 further has the claw portions F3 and F4, even if the positive electrode unit including the restraining plate 308, the insulating plate F30 and the current collector plate 6 is turned upside down, the insulating plate F30 and the current collector plate 6 are turned over. Can be suppressed from falling. Similarly, the negative electrode unit including the restraint plate 308, the insulating plate F30, and the current collector plate 7 can suppress the fall of the insulating plate F30 and the current collector plate 7. For example, when manufacturing the power storage device 1, the power storage module laminate 2 and the negative electrode unit may be placed in order on the positive electrode unit. In that case, when the negative electrode unit is turned over, the insulating plate F30 and the current collector plate 7 can be suppressed from falling.

FIG. 9 is a schematic partial cross-sectional view showing the power storage device according to the fourth modification. The power storage device according to this modification has the same configuration as the power storage device 1 except that the restraint plate 408 and the insulating plate F40 shown in FIG. 9 are provided in place of the restraint plate 308 and the insulating plate F30 shown in FIG. .. The restraint plate 408 has the same configuration as the restraint plate 308 except that it has a protrusion 408b instead of the opening 308b. The insulating plate F40 has the same configuration as the insulating plate F30 except that it has a holding portion F42 instead of the convex portion F32. The holding portion F42 of the insulating plate F30 is hooked on the protruding portion 408b of the restraining plate 408.

The protruding portion 408b of the restraint plate 408 projects outward from the edge of the restraint plate 408 when viewed from the stacking direction D1. The thickness of the protrusion 408b in the stacking direction D1 is thinner than the thickness of the restraint plate 408.

The holding portion F42 of the insulating plate F40 is connected to the base portion F421 extending along the lower surface of the protruding portion 408b and the intermediate portion F422 (the first) extending in the stacking direction D1 along the side surface of the protruding portion 408b. (2 positioning portion) and a claw portion 423 (regulating portion) connected to the intermediate portion F422 and extending along the upper surface of the protruding portion 408b. The intermediate portion F422 positions the insulating plate F40 and the restraining plate 408 in a direction intersecting the stacking direction D1 (for example, the directions D2 and D3). The claw portion F423 is hooked on the upper surface of the protruding portion 408b to regulate the relative movement between the insulating plate F40 and the restraining plate 408 in the stacking direction D1.

In this modification, even if the insulating plate F40 is located below the restraining plate 408 in the vertical direction, it is possible to prevent the insulating plate F40 from falling away from the restraining plate 408. When the insulating plate F40 further has the claw portions F3 and F4, the insulating plate F40 and the current collecting plate 6 can be turned upside down even if the positive electrode unit including the restraining plate 408, the insulating plate F40 and the current collector plate 6 is turned upside down. Can be suppressed from falling. Similarly, the negative electrode unit including the restraint plate 408, the insulating plate F40, and the current collector plate 7 can suppress the fall of the insulating plate F40 and the current collector plate 7.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment.

For example, the insulating plate F may have only one of the convex portions F1 and F2.

The convex portion F1 of the insulating plate F may be fitted into the concave portion of the current collector plate 6. The insulating plate F does not have the convex portion F1, and the entire insulating plate F may be fitted into the concave portion of the current collector plate 6. The insulating plate F may have a concave portion, and the current collector plate 6 may have a convex portion fitted into the concave portion of the insulating plate F.

The current collector plate has a positioning portion, and at least one of positioning between the current collector plate and the insulating plate and positioning between the current collector plate and the restraint plate may be performed.

The restraint plate has a positioning portion, and at least one of positioning between the restraint plate and the insulating plate and positioning between the restraint plate and the current collector plate may be performed. For example, the insulating pin as the positioning portion of the restraint plate may be positioned with the through hole provided in the insulating plate and the recess provided in the current collector plate.

The positioning portion may be provided only on the positive electrode unit (current collector plate, insulating plate and restraining plate located on the positive electrode side), or only on the negative electrode unit (current collector plate, insulating plate and restraining plate located on the negative electrode side). It may be provided in both the positive electrode unit and the negative electrode unit.

1 ... Power storage device, 4 ... Power storage module, 6, 7 ... Current collector plate, 8 ... Restraint plate, 8b ... Concave (second positioning part), 108b ... Convex part (second positioning part), 208b ... Convex part (first) 2 positioning part), 308b1 ... 1st part (second positioning part), F ... insulating plate, F1 ... convex part (first positioning part), F2 ... convex part (second positioning part), F3, F4 ... claw part (Regulatory part), F12 ... Recessed portion (second positioning part), F321 ... Base part (second positioning part), F322, F423 ... Claw part (regulated part), F422 ... Intermediate part (second positioning part).

Claims (6)

Multiple power storage modules stacked in the first direction,
A restraint plate arranged at the end of the stacked plurality of power storage modules in the first direction and applying a restraint load to the plurality of power storage modules in the first direction.
A current collector plate arranged between the restraint plate and the plurality of power storage modules and electrically connected to the plurality of power storage modules,
An insulating plate arranged between the restraint plate and the current collector plate,
Equipped with
Positioning between the current collector plate and the insulating plate in a second direction where at least one of the current collector plate, the insulating plate and the restraining plate intersects the first direction, and the insulation in the second direction. A current collector having a positioning unit for positioning at least one of the positioning between the plate and the restraining plate. The power storage device according to claim 1, wherein at least one of the current collector plate and the insulating plate has a first positioning unit for positioning between the current collector plate and the insulating plate in the second direction. .. The insulating plate has the first positioning portion, and the insulating plate has the first positioning portion.
The power storage device according to claim 2, wherein the first positioning portion is a convex portion. The power storage according to claim 2 or 3, wherein at least one of the current collector plate and the insulating plate has a regulating unit that regulates relative movement between the current collecting plate and the insulating plate in the first direction. Device. Any one of claims 2 to 4, wherein at least one of the insulating plate and the restraining plate has a second positioning portion for positioning between the insulating plate and the restraining plate in the second direction. The power storage device described in. The power storage device according to claim 5, wherein at least one of the insulating plate and the restraining plate has a regulating unit for restricting relative movement between the insulating plate and the restraining plate in the first direction.

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