JP2019186117A - Power storage device and manufacturing method of power storage device - Google Patents

Abstract

To provide a power storage device capable of improving vibration resistance, and to provide a manufacturing method of a power storage device.SOLUTION: A power storage device includes a cell stack including multiple power storage cells laminated alternately via a positive electrode collector plate 15 and a negative electrode collector plate 16, a positive electrode bus bar 4 extending in the lamination direction, and joined to the positive electrode collector plate 15 in the height direction, and a negative electrode bus bar 5 extending in the lamination direction, and joined to the negative electrode collector plate 16 in the height direction. Each of the multiple power storage cells has multiple bipolar electrodes laminated in the lamination direction, and a holding member for holding the multiple bipolar electrodes, the positive electrode bus bar 4 has a protrusion 41 for locking the holding member 9A of a power storage cell 7A, out of the multiple power storage cells, and the holding member 9A has a recess 91A facing the protrusion 41 in the width direction.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a power storage device and a method for manufacturing the power storage device.

  As a conventional power storage device, for example, a battery unit described in Patent Document 1 is known. The battery unit described in Patent Document 1 includes a plurality of bipolar batteries and current collectors arranged on both sides of the bipolar battery so as to sandwich the bipolar batteries. The current collector disposed on one side of the bipolar battery functions as a positive electrode current collecting electrode and is electrically connected to a positive electrode connection conductor extending in the stacking direction of the bipolar battery. The current collector disposed on the other side of the bipolar battery functions as a negative electrode current collecting electrode, and is electrically connected to a negative electrode connection conductor extending in the stacking direction of the bipolar battery.

JP 2009-117105 A

  In the battery unit (power storage device) described in Patent Document 1, each connection conductor (bus bar) is connected to the current collector plate by welding or the like. When the power storage device is mounted on a vehicle or the like, a force may be applied to each power storage cell in a direction intersecting with the stacking direction of the bipolar batteries (power storage cells) due to vibration. In this case, since a force is also applied in the same direction to the current collector plates provided between the adjacent storage cells, a shear stress is applied to the joint between the bus bar and the current collector plate, and the current collector plate is peeled off from the bus bar. There is a fear.

  The objective of this invention is providing the electrical storage apparatus which can improve vibration resistance, and the manufacturing method of an electrical storage apparatus.

  A power storage device according to one aspect of the present invention includes a cell stack including a plurality of power storage cells stacked along a first direction alternately via a first current collector plate and a second current collector plate; A first bus bar extending along the first direction and joined to the first current collector plate in the second direction intersecting the first direction, and extending along the first direction to the second current collector plate in the second direction. And a joined second bus bar. Each of the plurality of power storage cells includes a plurality of electrodes stacked along the first direction and a holding member that holds the plurality of electrodes. The first bus bar has a first locking portion for locking the first holding member of the first power storage cell among the plurality of power storage cells in a third direction intersecting the first direction and the second direction. The first holding member has a first locked portion that faces the first locking portion in the third direction.

  In this power storage device, the first locking portion of the first bus bar faces the first locked portion of the first holding member in the third direction. For this reason, even if force is applied to the first storage cell along the third direction due to vibration, the first locked portion comes into contact with the first locking portion, so that the first holding member in the third direction The movement is restricted by the first locking portion of the first bus bar. Thereby, it is suppressed that the 1st electrical storage cell moves to the 3rd direction to the 1st bus bar, and the 1st current collection board adjacent to the 1st electrical storage cell also moves to the 3rd direction to the 1st bus bar. It is suppressed. Therefore, it is possible to reduce the shear stress applied along the third direction to the joint portion between the first bus bar and the first current collector plate. As a result, the vibration resistance of the power storage device can be improved.

  The first bus bar may have a protrusion that protrudes toward the first holding member along the second direction. The first holding member may be provided with a concave portion that fits with the convex portion. The first locking part may be a convex part, and the first locked part may be a concave part. In this case, since the convex portion of the first bus bar and the concave portion of the first holding member are fitted together, it is possible to more reliably suppress the first storage cell from moving in the third direction with respect to the first bus bar.

  The first holding member may have a protrusion that protrudes toward the first bus bar along the second direction. The first bus bar may be provided with a recess that fits with the protrusion. The first locking part may be a concave part, and the first locked part may be a convex part. In this case, since the convex portion of the first holding member and the concave portion of the first bus bar are fitted, it is possible to more reliably suppress the first power storage cell from moving in the third direction with respect to the first bus bar.

  The first bus bar may be provided with a through hole penetrating the first bus bar in the second direction. The first holding member may have a protrusion that protrudes toward the first bus bar along the second direction and is inserted through the through hole. The first locking portion may be an inner peripheral surface that defines the through hole, and the first locked portion may be a protruding portion. In this case, since the protruding portion of the first holding member is inserted into the through hole of the first bus bar, the protruding portion can contact the inner peripheral surface of the through hole in the third direction. For this reason, the movement of the first holding member in the third direction is restricted by the through hole of the first bus bar. Thereby, it can suppress more reliably that a 1st electrical storage cell moves to a 3rd direction with respect to a 1st bus bar.

  The first bus bar has a first portion provided along the top surface in the second direction of the first holding member, and a second portion provided along the side surface in the third direction of the first holding member. Also good. The first locking portion may be a second portion, and the first locked portion may be a side surface. In this case, the movement of the first holding member in the third direction is restricted by the second portion of the first bus bar by the side surface of the first holding member coming into contact with the second portion of the first bus bar. Thereby, it can suppress more reliably that a 1st electrical storage cell moves to a 3rd direction with respect to a 1st bus bar.

  The first bus bar may have an end surface in the third direction. The first holding member may have a protrusion that protrudes along the second direction and faces the end surface in the third direction. The first locking portion may be an end surface, and the first locked portion may be a protruding portion. In this case, the movement of the first holding member in the third direction is restricted by the end surface of the first bus bar by the protrusion of the first holding member coming into contact with the end surface of the first bus bar. Thereby, it can suppress more reliably that a 1st electrical storage cell moves to a 3rd direction with respect to a 1st bus bar.

  The protrusion may be provided at an end portion in the third direction of the first holding member. The power storage device may be housed in the housing. In this case, a clearance (separation distance) between the first bus bar and the housing can be ensured by interposing the protruding portion between the first bus bar and the housing. Thereby, possibility that a 1st bus bar will contact a housing | casing can be reduced.

  The second bus bar may have a second locking portion for locking the second holding member of the second power storage cell among the plurality of power storage cells in the third direction. The second holding member may have a second locked portion that faces the second locking portion in the third direction. In this case, the second locking portion of the second bus bar is opposed to the second locked portion of the second holding member in the third direction. For this reason, even if force is applied to the second storage cell along the third direction due to vibration, the second locked portion comes into contact with the second locking portion, so that the second holding member in the third direction The movement is restricted by the second locking portion of the second bus bar. Thereby, it is suppressed that the 2nd electrical storage cell moves to the 3rd direction to the 2nd bus bar, and the 2nd current collection board adjacent to the 2nd electrical storage cell also moves to the 3rd direction to the 2nd bus bar. It is suppressed. Therefore, the shear stress applied along the third direction at the joint portion between the second bus bar and the second current collector plate can be reduced. As a result, the vibration resistance of the power storage device can be further improved.

  The first bus bar may have a third locking portion for locking the second holding member in the third direction. The second holding member may have a third locked portion that faces the third locking portion in the third direction. In this case, the third locking portion of the first bus bar is opposed to the third locked portion of the second holding member in the third direction. For this reason, even if force is applied to the second storage cell along the third direction due to vibration, the third locked portion comes into contact with the third locking portion, so that the second holding member in the third direction The movement is restricted by the third locking portion of the first bus bar. Thereby, it is suppressed that the 2nd electrical storage cell moves to the 3rd direction to the 1st bus bar, and the 1st current collection board adjacent to the 2nd electrical storage cell also moves to the 3rd direction to the 1st bus bar. It is suppressed. Therefore, it is possible to reduce the shear stress applied along the third direction to the joint portion between the first bus bar and the first current collector plate. As a result, the vibration resistance of the power storage device can be further improved.

  A method for manufacturing a power storage device according to another aspect of the present invention forms a cell stack by stacking a plurality of power storage cells along a first direction alternately through a first current collector plate and a second current collector plate. Extending along the first direction to a top surface in a second direction intersecting the first direction of the cell stack, and a step of disposing a pair of end plates at both ends in the first direction of the cell stack A step of disposing the first bus bar and the second bus bar; and a step of joining the first bus bar and the first current collector plate and joining the second bus bar and the second current collector plate. The plurality of power storage cells includes a plurality of first power storage cells and a plurality of second power storage cells, and the plurality of first power storage cells and the plurality of second power storage cells are alternately arranged one by one along the first direction. Is done. Each of the plurality of first power storage cells includes a plurality of first electrodes stacked along the first direction, and a first holding member that holds the plurality of first electrodes. Each of the plurality of second power storage cells has a plurality of second electrodes stacked along the first direction and a second holding member that holds the plurality of second electrodes. The first bus bar has a first locking portion for locking the first holding member in a third direction intersecting the first direction and the second direction. The first holding member has a first locked portion that faces the first locking portion in the third direction. The second bus bar has a second locking portion for locking the second holding member in the third direction. The second holding member has a second locked portion that faces the second locking portion in the third direction. When the first bus bar is disposed, the first locking portion and the first locked portion are brought into contact with each other in the third direction, and when the second bus bar is positioned, the second locking portion and the second locked surface are disposed. By bringing the stoppers into contact with each other in the third direction, the positions of the plurality of storage cells in the third direction are aligned.

  In the power storage device manufactured by the method for manufacturing the power storage device, the first locking portion of the first bus bar faces the first locked portion of the first holding member in the third direction, and the second bus bar first The two locking portions are opposed to the second locked portion of the second holding member in the third direction. For this reason, even if force is applied to the first storage cell along the third direction due to vibration, the first locked portion comes into contact with the first locking portion, so that the first holding member in the third direction The movement is restricted by the first locking portion of the first bus bar. Thereby, it is suppressed that the 1st electrical storage cell moves to the 3rd direction to the 1st bus bar, and the 1st current collection board adjacent to the 1st electrical storage cell also moves to the 3rd direction to the 1st bus bar. It is suppressed. Therefore, it is possible to reduce the shear stress applied along the third direction to the joint portion between the first bus bar and the first current collector plate. Similarly, the second power storage cell is restrained from moving in the third direction with respect to the second bus bar, and the second current collector plate adjacent to the second power storage cell also moves in the third direction with respect to the second bus bar. It is suppressed. Therefore, the shear stress applied along the third direction at the joint portion between the second bus bar and the second current collector plate can be reduced. As a result, the vibration resistance of the power storage device can be improved.

  According to the present invention, the vibration resistance of the power storage device can be improved.

FIG. 1 is a schematic perspective view showing a power storage device according to an embodiment. FIG. 2 is a plan view partially showing the power storage device shown in FIG. FIG. 3A and FIG. 3B are perspective views showing the storage cell shown in FIG. 2 together with a positive electrode current collector plate and a negative electrode current collector plate. FIG. 4 is a cross-sectional view of the storage cell shown in FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7A is a sectional view taken along line VIIa-VIIa in FIG. FIG. 7B is a sectional view taken along line VIIb-VIIb in FIG. FIG. 8 is a process diagram showing a method of manufacturing the power storage device shown in FIG. FIG. 9A and FIG. 9B are cross-sectional views of the power storage device according to the first modification. FIG. 10A and FIG. 10B are cross-sectional views of a power storage device according to a second modification. FIG. 11 is a plan view partially showing a cell stack included in the power storage device according to the third modification. FIG. 12 is a cross-sectional view of a power storage device according to a third modification. FIG. 13 is a cross-sectional view of a power storage device according to a fourth modification. FIG. 14 is a cross-sectional view of a power storage device according to a fifth modification. FIG. 15 is a cross-sectional view of a power storage device according to a sixth modification. 16 is a cross-sectional view taken along line XVI-XVI in FIG. FIG. 17 is a cross-sectional view for explaining the movement restriction in the stacking direction of the storage cells.

  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 redundant descriptions are omitted. In the drawing, an XYZ orthogonal coordinate system is shown as necessary.

  FIG. 1 is a schematic perspective view showing a power storage device according to an embodiment. FIG. 2 is a plan view partially showing the power storage device shown in FIG. FIG. 3A and FIG. 3B are perspective views showing the storage cell shown in FIG. 2 together with a positive electrode current collector plate and a negative electrode current collector plate. FIG. 4 is a cross-sectional view of the storage cell shown in FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid cars, and electric cars. The power storage device 1 includes a cell stack 2, a pair of end plates 3, a positive bus bar 4 (first bus bar), a negative bus bar 5 (second bus bar), and a cover member 6.

  The cell stack 2 is configured by stacking a plurality of power storage cells 7. The cell stack 2 is an aggregate of about 100 storage cells 7, for example. In the following description, the stacking direction of the storage cells 7 is the X-axis direction (first direction), the width direction of the storage cells 7 is the Y-axis direction (third direction), and the height direction of the storage cells 7 is the Z-axis direction. (Second direction). In the following description, the stacking direction of the storage cells 7 is simply expressed as “stacking direction”, the width direction of the storage cells 7 is simply expressed as “width direction”, and the height direction of the storage cells 7 is simply expressed as “height direction”. .

  The storage cell 7 is a single battery having a flat, substantially rectangular parallelepiped shape. The storage cell 7 may be a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, or may be an electric double layer capacitor. The storage cell 7 may be an all-solid battery. In this embodiment, the case where the electrical storage cell 7 is a bipolar type lithium ion secondary battery is illustrated. As shown in FIG. 2, in the present embodiment, the plurality of power storage cells 7 includes a plurality of power storage cells 7A (a plurality of first power storage cells) and a plurality of power storage cells 7B (a plurality of second power storage cells), as will be described later. Storage cell). The storage cells 7A and the storage cells 7B are alternately arranged along the stacking direction one by one. Note that a portion common to the storage cell 7A and the storage cell 7B will be described as the storage cell 7 without distinguishing between the storage cell 7A and the storage cell 7B.

  The electrical storage cell 7 has the electrode laminated body 8 and the holding member 9, as FIG.3 (a), FIG.3 (b), and FIG. 4 show. The electrode laminate 8 has a structure in which a plurality of bipolar electrodes 10 (a plurality of electrodes, a plurality of first electrodes, and a plurality of second electrodes) are laminated via a separator 11. The plurality of bipolar electrodes 10 are stacked along the stacking direction. The bipolar electrode 10 has a current collector 12, a positive electrode layer 13 formed on one surface of the current collector 12, and a negative electrode layer 14 formed on the other surface of the current collector 12. .

  The current collector 12 is a sheet-like conductive member having a substantially rectangular shape. The current collector 12 is, for example, a metal foil or an alloy foil. Examples of the metal foil include copper foil, aluminum foil, titanium foil, and nickel foil. When the current collector 12 is a metal foil, an aluminum foil may be used as the current collector 12 from the viewpoint of securing mechanical strength. Examples of the alloy foil include a stainless steel foil or an alloy foil of the above metal. When the current collector 12 is a metal foil other than the alloy foil and the aluminum foil, the surface of the current collector 12 may be coated with aluminum.

  The positive electrode layer 13 includes a positive electrode active material and an electrolyte. The positive electrode active material is, for example, a composite oxide, metallic lithium or sulfur. The composition of the composite oxide includes, for example, at least one of manganese, titanium, nickel, cobalt, and aluminum and lithium. The electrolyte is, for example, a solid electrolyte, a solid polymer electrolyte, or a gel electrolyte. The solid electrolyte includes zirconia or β-alumina. The solid polymer electrolyte includes, for example, an alkylene oxide polymer compound such as polyethylene oxide (PEO) and polypropylene oxide (PPO), or a copolymer thereof. A gel electrolyte is an electrolyte that does not exhibit fluidity completely or exhibits fluidity almost completely. For example, the viscosity of the gel electrolyte at 20 ° C. is 0.1 Pa · S or more.

When the positive electrode layer 13 includes a solid polymer electrolyte, the positive electrode layer 13 is, for example, at least one of a supporting salt for increasing ionic conductivity, a conductive assistant for increasing electron conductivity, a viscosity adjusting solvent, and a polymerization initiator. Including The supporting salt is, for example, a lithium salt from the viewpoint of being easily soluble in the alkylene oxide polymer compound. The lithium salt is, for example, LiBF ₄ , LiPF ₆ , LiN (SO ₂ CF ₃ ) ₂ , LiN (SO ₂ C ₂ F ₅ ) ₂ , or a mixture thereof. The conductive auxiliary agent is, for example, acetylene black, carbon black, or graphite. The viscosity adjusting solvent is, for example, N-methyl-2-pyrrolidone (NMP). Examples of the polymerization initiator include azobisisobutyronitrile (AIBN).

  The negative electrode layer 14 includes a negative electrode active material and an electrolyte. The negative electrode active material is, for example, graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon or soft carbon, alkali metals such as lithium or sodium, metal compounds, elements that can be alloyed with lithium, or compounds thereof, or For example, boron-added carbon. Examples of elements that can be alloyed with lithium include silicon (silicon) and tin. The electrolyte of the negative electrode layer 14 is the same as the electrolyte contained in the positive electrode layer 13, for example.

  The separator 11 is a layered member that separates the bipolar electrodes 10 adjacent to each other, and has a substantially rectangular shape. The separator 11 is composed of an electrolyte contained in the positive electrode layer 13 and the negative electrode layer 14. The separator 11 may be a porous film that can be filled with an electrolyte. When the separator 11 is formed of a solid electrolyte, the separator 11 may have a substantially rectangular plate shape.

  Current collectors 12 are respectively provided at both ends of the electrode stack 8 in the stacking direction. Only the positive electrode layer 13 is formed on the current collector 12 positioned at one end of the electrode laminate 8 (the right end in FIG. 4), and this current collector 12 functions as a positive electrode terminal of the storage cell 7. . Only the negative electrode layer 14 is formed on the current collector 12 positioned at the other end of the electrode laminate 8 (the left end in FIG. 4). The current collector 12 functions as the negative electrode terminal of the storage cell 7. To do.

  The holding member 9 is a member that holds the electrode stack 8 (a plurality of bipolar electrodes 10). The holding member 9 has a rectangular frame shape surrounding both side surfaces, top surfaces, and bottom surfaces of the electrode laminate 8 in the width direction. The holding member 9 is made of, for example, a resin having insulating properties and heat resistance. Examples of the resin forming the holding member 9 include polyimide, polypropylene (PP), polyphenylene sulfide (PPS), and nylon 66 (PA66). The holding member 9 has a function of sealing the bipolar electrode 10 and preventing a short circuit between the bipolar electrodes 10.

  The plurality of power storage cells 7 are stacked via alternating positive electrode current collector plates 15 (first current collector plates) and negative electrode current collector plates 16 (second current collector plates). The positive electrode current collector plate 15 and the negative electrode current collector plate 16 are metal plates having a rectangular shape substantially the same shape as the main surface of the storage cell 7. The main surface of the storage cell 7 is a pair of surfaces intersecting the stacking direction of the electrode stack 8, specifically, the outer surface of the current collector 12 positioned at both ends of the electrode stack 8 in the stacking direction. . The positive electrode current collector plate 15 and the negative electrode current collector plate 16 are made of, for example, the same metal material as that of the current collector 12. The positive electrode current collector plate 15 and the negative electrode current collector plate 16 are disposed so as to sandwich the storage cell 7 in the stacking direction. The positive electrode current collector plate 15 is in contact with the outer surface of the current collector 12 that functions as the positive electrode terminal of the storage cell 7. The negative electrode current collector plate 16 is in contact with the outer surface of the current collector 12 that functions as the negative electrode terminal of the storage cell 7.

  The positive electrode current collector plate 15 includes a main body portion 15a having a rectangular shape in plan view, and a positive electrode tab 15b integrated with the main body portion 15a. The main body portion 15a contacts the current collector 12 that functions as a positive electrode terminal. The positive electrode tab 15 b is joined to the positive electrode bus bar 4. The positive electrode tab 15b protrudes in the height direction with respect to the electrode laminate 8 on one side in the width direction. The tip of the positive electrode tab 15b is bent outward from the storage cell 7A and extends toward the storage cell 7B. The bent portion of the positive electrode tab 15b of each positive electrode current collector plate 15 is aligned facing one side in the stacking direction. And the positive electrode bus bar 4 is joined to the bending part of the positive electrode tab 15b of each positive electrode current collecting plate 15 by welding etc. (refer FIG. 5). The positive electrode current collector plate 15 and the positive electrode bus bar 4 are joined by a welded portion W1. In addition, the width | variety of the positive electrode tab 15b is smaller than the half of the width | variety of the positive electrode current collecting plate 15, and the width | variety of the positive electrode tab 15b of each positive electrode current collecting plate 15 is mutually equal.

  The negative electrode current collector plate 16 has a main body portion 16a having a rectangular shape in plan view, and a negative electrode tab 16b integrated with the main body portion 16a. The main body portion 16a contacts the current collector 12 functioning as a negative electrode terminal. The negative electrode tab 16 b is joined to the negative electrode bus bar 5. The negative electrode tab 16b protrudes in the height direction with respect to the electrode laminate 8 on the other side in the width direction. The negative electrode tab 16b protrudes on the same side as the positive electrode tab 15b in the height direction. The tip of the negative electrode tab 16b is bent outward from the electricity storage cell 7B and extends toward the electricity storage cell 7A. The bending direction of the negative electrode tab 16b is the same as the bending direction of the positive electrode tab 15b. The bent portion of the negative electrode tab 16b of each negative electrode current collector plate 16 is aligned facing one side in the stacking direction. And the negative electrode bus-bar 5 is joined with the bending part of the negative electrode tab 16b of each negative electrode current collecting plate 16 by welding etc. (refer FIG. 6). The negative electrode current collector plate 16 and the negative electrode bus bar 5 are joined by a welded portion W2. The width of the negative electrode tab 16b is smaller than half the width of the negative electrode current collector plate 16, and the width of the negative electrode tab 16b of each negative electrode current collector plate 16 is equal to each other. The negative electrode tab 16b is separated from the positive electrode tab 15b in the width direction.

  As shown in FIG. 2, in the present embodiment, one of the positive electrode tab 15 b and the negative electrode tab 16 b is provided on the top surface 9 a of the holding member 9. That is, in the cell stack 2, the holding members 9A (power storage cells 7A) provided with the negative electrode tabs 16b and the holding members 9B (power storage cells 7B) provided with the positive electrode tabs 15b are alternately arranged along the stacking direction. Has been.

  The end plate 3 is a restraining member that regulates the displacement of the storage cell 7 in the stacking direction. The end plates 3 are arranged on both sides of the cell stack 2 in the stacking direction. The end plate 3 has an L shape in side view. The end plate 3 is made of, for example, a metal or an alloy. The end plates 3 are connected to each other by a cover member 6, and a restraining load along the stacking direction is applied to the cell stack 2 via the end plate 3. Each end plate 3 may be connected with fastening members, such as a volt | bolt and a nut. In this case, a binding load along the stacking direction is applied to the cell stack 2 via the end plate 3 by the tightening force of the fastening member.

  Insulation buffer members 17 are respectively disposed between the storage cells 7 and the end plates 3 positioned at both ends of the cell stack 2 in the stacking direction. The insulating buffer member 17 is a member having a function of absorbing expansion of the storage cell 7. The insulating buffer member 17 has, for example, a rectangular parallelepiped shape having the same area as the main surface of the storage cell 7 when viewed from the stacking direction. Examples of a material for forming the insulating buffer member 17 include PP, PPS, and PA66.

  Each of the positive electrode bus bar 4 and the negative electrode bus bar 5 extends along the stacking direction, as shown in FIG. The positive electrode bus bar 4 and the negative electrode bus bar 5 are arranged side by side in the width direction on the same side in the height direction with respect to the cell stack 2. Specifically, the positive electrode bus bar 4 is disposed on one side in the width direction on the top surface of the cell stack 2. The negative electrode bus bar 5 is arranged on the other side in the width direction on the top surface of the cell stack 2 so as to be separated from the positive electrode bus bar 4. The positive electrode bus bar 4 is joined to each positive electrode current collector plate 15 and is electrically connected to each positive electrode current collector plate 15. The negative electrode bus bar 5 is joined to each negative electrode current collector plate 16 and is electrically connected to each negative electrode current collector plate 16.

  The positive electrode bus bar 4 and the negative electrode bus bar 5 have a rectangular plate shape, for example. The forming material of the positive electrode bus bar 4 and the negative electrode bus bar 5 may be, for example, a metal such as copper, aluminum, titanium, or nickel, or may be stainless steel or an alloy of the above-described metals.

  An extraction terminal for connecting the cell stack 2 to an external device may be connected to one end in the longitudinal direction of the positive electrode bus bar 4. An extraction terminal for connecting the cell stack 2 to an external device may be connected to one end of the negative electrode bus bar 5 in the longitudinal direction. The positive electrode bus bar 4 regulates the displacement of the storage cell 7A in the width direction. The negative electrode bus bar 5 regulates the displacement of the storage cell 7B in the width direction. The regulation of the displacement of the storage cell 7 by each bus bar will be described later.

  The cover member 6 is a member for defining the position of the storage cell 7 in the height direction. The cover member 6 extends along the stacking direction. The cover member 6 is made of, for example, a metal or an alloy. The cover member 6 is disposed between the positive electrode bus bar 4 and the negative electrode bus bar 5 in a state of being separated from the positive electrode bus bar 4 and the negative electrode bus bar 5 on the top surface of the cell stack 2. The cover member 6 has a main body portion 6a extending in the stacking direction and a pair of claw portions 6b provided at both ends in the longitudinal direction of the main body portion 6a. The claw portion 6 b is fixed to the outer surface of the end plate 3 by the fastening member E. Thereby, the cover member 6 is locked to the cell stack 2, and a restraining load along the stacking direction is applied to the cell stack 2 via the pair of end plates 3.

  Next, with reference to (a) of FIG. 7 and (b) of FIG. 7, the regulation of the displacement of the storage cell 7 by the positive electrode bus bar 4 and the negative electrode bus bar 5 will be described. FIG. 7A is a sectional view taken along line VIIa-VIIa in FIG. FIG. 7B is a sectional view taken along line VIIb-VIIb in FIG.

  As shown in FIG. 5 and FIG. 7A, the positive electrode bus bar 4 includes a plurality of convex portions 41 provided on the bottom surface 4 a of the positive electrode bus bar 4. The convex portion 41 projects from the bottom surface 4a toward the holding member 9A (first holding member) along the height direction. The plurality of convex portions 41 are arranged along the stacking direction, and are provided every other holding member 9 (power storage cell 7). Specifically, the convex portion 41 is provided for the electricity storage cell 7A and is not provided for the electricity storage cell 7B. The convex portion 41 includes a top surface 41a that intersects the height direction, side surfaces 41b and 41c that intersect the width direction, and side surfaces 41d and 41e that intersect the stacking direction.

  As shown in FIG. 6 and FIG. 7B, the negative electrode bus bar 5 includes a convex portion 51 provided on the bottom surface 5 a of the negative electrode bus bar 5. The convex portion 51 protrudes from the bottom surface 5a toward the holding member 9B (second holding member) along the height direction. The several convex part 51 is arranged along the lamination direction, and is provided every other with respect to the holding member 9 (electric storage cell 7). Specifically, the convex part 51 is provided with respect to the electrical storage cell 7B, and is not provided with respect to the electrical storage cell 7A. The convex portion 51 has a top surface 51a that intersects with the height direction, side surfaces 51b and 51c that intersect with the width direction, and side surfaces 51d and 51e that intersect with the stacking direction.

  A recess 91A is provided on the top surface 9a of the holding member 9A. The concave portion 91A is provided on the opposite side to the negative electrode tab 16b in the width direction, and is located under the positive electrode bus bar 4 (convex portion 41). The concave portion 91 </ b> A has a shape that fits with the convex portion 41 of the positive electrode bus bar 4. The recess 91A includes a bottom surface 91a that intersects the height direction, side surfaces 91b and 91c that intersect the width direction, and side surfaces 91d and 91e that intersect the stacking direction.

  A concave portion 91B is provided on the top surface 9a of the holding member 9B. The concave portion 91B is provided on the side opposite to the positive electrode tab 15b in the width direction, and is located under the negative electrode bus bar 5 (the convex portion 51). The concave portion 91 </ b> B has a shape that fits with the convex portion 51 of the negative electrode bus bar 5. The recess 91B has a bottom surface 91f that intersects the height direction, side surfaces 91g and 91h that intersect the width direction, and side surfaces 91i and 91j that intersect the stacking direction.

  In the power storage device 1, the convex portion 41 is fitted in the concave portion 91A. That is, the side surfaces 91b and 91c are opposed to and in contact with the side surfaces 41b and 41c in the width direction. With this configuration, the holding member 9A is suppressed from moving in the width direction. That is, the convex portion 41 functions as a locking portion (first locking portion) that locks the holding member 9A in the width direction, and the concave portion 91A is a locked portion (first locking portion) that faces the convex portion 41 in the width direction. 1 locked portion). Thereby, it is suppressed that each electrical storage cell 7A moves to the width direction with respect to the positive electrode bus bar 4.

  Further, in the power storage device 1, the side surfaces 91d and 91e are opposed to and in contact with the side surfaces 41d and 41e in the stacking direction, respectively. With this configuration, the holding member 9A is suppressed from moving in the stacking direction. That is, the convex portion 41 also functions as a locking portion that locks the holding member 9A in the stacking direction, and the concave portion 91A also functions as a locked portion that faces the convex portion 41 in the stacking direction. Thereby, it is suppressed that each electrical storage cell 7A moves to the lamination direction with respect to the positive electrode bus bar 4. From the above, the relative position of the storage cell 7A with respect to the positive electrode bus bar 4 is defined in the width direction and the stacking direction.

  Similarly, in the power storage device 1, the convex portion 51 is fitted in the concave portion 91B. That is, the side surfaces 91g and 91h are opposed to and in contact with the side surfaces 51b and 51c in the width direction. With this configuration, the holding member 9B is suppressed from moving in the width direction. That is, the convex portion 51 functions as a locking portion (second locking portion) that locks the holding member 9B in the width direction, and the concave portion 91B is a locked portion (first locking portion) that faces the convex portion 51 in the width direction. 2 function). Thereby, it is suppressed that each electrical storage cell 7B moves in the width direction with respect to the negative electrode bus bar 5.

  In the power storage device 1, the side surfaces 91i and 91j are in contact with and in contact with the side surfaces 51d and 51e, respectively, in the stacking direction. With this configuration, the holding member 9B is suppressed from moving in the stacking direction. That is, the convex portion 51 also functions as a locking portion that locks the holding member 9B in the stacking direction, and the concave portion 91B also functions as a locked portion that faces the convex portion 51 in the stacking direction. Thereby, it is suppressed that each electrical storage cell 7B moves to the lamination direction with respect to the negative electrode bus bar 5. From the above, the relative position of the storage cell 7B with respect to the negative electrode bus bar 5 is defined in the width direction and the stacking direction.

  As described above, in the power storage device 1, the convex portion 41 of the positive electrode bus bar 4 and the concave portion 91A of the holding member 9A are fitted. For this reason, even if force is applied to each storage cell 7A along the width direction by vibration, the side surface 91b of the recess 91A abuts on the side surface 41b of the projection 41 in the width direction, and the side surface 91c of the recess 91A is in the width direction. Since it is in contact with the side surface 41 c of the convex portion 41, the movement of the holding member 9 </ b> A in the width direction is suppressed by the convex portion 41 of the positive electrode bus bar 4. Thereby, it is suppressed that each electrical storage cell 7A moves to the width direction with respect to the positive electrode bus bar 4.

  Similarly, in the power storage device 1, the convex portion 51 of the negative electrode bus bar 5 and the concave portion 91B of the holding member 9B are fitted. For this reason, even if force is applied to each power storage cell 7B along the width direction due to vibration, the side surface 91g of the recess 91B contacts the side surface 51b of the projection 51 in the width direction, and the side surface 91h of the recess 91B is in the width direction. Since it is in contact with the side surface 51 c of the convex portion 51, the movement of the holding member 9 </ b> B in the width direction is suppressed by the convex portion 51 of the negative electrode bus bar 5. Thereby, it is suppressed that each electrical storage cell 7B moves in the width direction with respect to the negative electrode bus bar 5.

  Therefore, the positive electrode current collector plate 15 and the negative electrode current collector plate 16 sandwiched between the adjacent energy storage cells 7A and 7B are also suppressed from moving in the width direction with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5. Accordingly, the shear stress applied along the width direction to the welded portion W1 between the positive electrode bus bar 4 and the positive electrode current collector plate 15 can be reduced. Similarly, the shear stress applied along the width direction to the welded portion W2 between the negative electrode bus bar 5 and the negative electrode current collector plate 16 can be reduced. As a result, the vibration resistance of the power storage device 1 can be improved.

  Note that the side surface 91b may be in contact with the side surface 41b in the width direction or may be separated. The side surface 91c may be in contact with the side surface 41c in the width direction or may be separated. In any case, when the holding member 9A attempts to move in the width direction, at least one of the side surface 91b and the side surface 91c abuts against the opposing side surface (the side surface 41b or the side surface 41c). Thereby, it is suppressed that 9 A of holding members move in the width direction. Similarly, the side surface 91g may be in contact with the side surface 51b in the width direction or may be separated. The side surface 91h may be in contact with the side surface 51c in the width direction or may be separated. In any case, when the holding member 9B tries to move in the width direction, at least one of the side surface 91g and the side surface 91h abuts against the opposing side surface (side surface 51b or side surface 51c). Thereby, it is suppressed that the holding member 9B moves in the width direction. Furthermore, the side surfaces 91d and 91e may be in contact with the side surfaces 41d and 41e or may be separated from each other. Similarly, the side surfaces 91i and 91j may be in contact with the side surfaces 51d and 51e, or may be separated from each other.

  Next, a method for manufacturing power storage device 1 will be described with reference to FIG. FIG. 8 is a process diagram showing a method of manufacturing the power storage device shown in FIG.

  As shown in FIG. 8, first, in step S01, the cell stack 2 is formed. Specifically, a plurality of power storage cells 7 are stacked along one direction with the positive electrode current collecting plate 15 and the negative electrode current collecting plate 16 being alternately arranged. More specifically, the positive electrode current collector plate 15, the power storage cell 7A, the negative electrode current collector plate 16, and the power storage cell 7B are repeatedly stacked in that order. Thereby, the cell stack 2 is formed.

  Subsequently, in step S02, a pair of end plates 3 are arranged. Specifically, a pair of end plates 3 are disposed on both ends of the cell stack 2 in the stacking direction via insulating buffer members 17.

  Subsequently, the positive electrode bus bar 4 and the negative electrode bus bar 5 are arranged in the cell stack 2 in step S03. Specifically, the positive electrode bus bar 4 is provided along the stacking direction on one side in the width direction on the top surface of the cell stack 2. More specifically, the positive electrode bus bar 4 is disposed on the top surface of the cell stack 2 so as to be in contact with each of the positive electrode tabs 15 b of the plurality of positive electrode current collector plates 15. At this time, each convex portion 41 of the positive electrode bus bar 4 is fitted into the concave portion 91 </ b> A of the holding member 9 </ b> A corresponding to the convex portion 41. That is, the side surfaces 41b and 41c of the convex portion 41 and the side surfaces 91b and 91c of the concave portion 91A are in contact with each other, and the side surfaces 41d and 41e of the convex portion 41 and the side surfaces 91d and 91e of the concave portion 91A are in contact with each other. Thereby, the positions in the width direction of the plurality of power storage cells 7A are aligned, and the positions in the stacking direction of the power storage cells 7A are defined.

  Similarly, the negative electrode bus bar 5 is provided on the other side in the width direction on the top surface of the cell stack 2 along the stacking direction. More specifically, the negative electrode bus bar 5 is disposed on the top surface of the cell stack 2 so as to be in contact with each of the negative electrode tabs 16 b of the plurality of negative electrode current collector plates 16. At this time, each convex part 51 of the negative electrode bus bar 5 is fitted into the concave part 91 </ b> B of the holding member 9 </ b> B corresponding to the convex part 51. That is, the side surfaces 51b and 51c of the convex portion 51 and the side surfaces 91g and 91h of the concave portion 91B are in contact with each other, and the side surfaces 51d and 51e of the convex portion 51 and the side surfaces 91i and 91j of the concave portion 91B are in contact with each other. Thereby, the position in the width direction of the plurality of power storage cells 7B is aligned, and the position in the stacking direction of each power storage cell 7B is defined.

  Subsequently, in step S04, the cover member 6 is attached. Specifically, the cover member 6 is disposed on the top surface of the cell stack 2 along the stacking direction between the positive electrode bus bar 4 and the negative electrode bus bar 5. The claw portion 6b is fixed to the outer surface of the end plate 3 by the fastening member E. As a result, a binding load along the stacking direction is applied to the cell stack 2 via the pair of end plates 3.

  Subsequently, in step S05, the positive electrode bus bar 4 and the positive electrode current collector plate 15 (positive electrode tab 15b) are joined by, for example, laser welding. Thereby, the welding part W1 which joins the positive electrode bus bar 4 and the positive electrode tab 15b is formed. Similarly, the negative electrode bus bar 5 and the negative electrode current collector plate 16 (negative electrode tab 16b) are joined by, for example, laser welding. As a result, a welded portion W2 that joins the negative electrode bus bar 5 and the negative electrode tab 16b is formed.

  Through the above steps, the power storage device 1 is manufactured. Note that the order of step S04 and step S05 may be switched. Since the cover member 6 does not necessarily have to be attached, step S04 can be omitted.

  In the method for manufacturing the power storage device 1, when the positive bus bar 4 is disposed, the convex portions 41 of the positive bus bar 4 and the concave portions 91A of the holding member 9A are fitted together so that the positions of the plurality of power storage cells 7A in the width direction are adjusted. Aligned. Similarly, when the negative electrode bus bar 5 is disposed, the convex portions 51 of the negative electrode bus bar 5 and the concave portions 91B of the holding member 9B are fitted together so that the positions in the width direction of the plurality of storage cells 7B are aligned. Thereby, the positions of the plurality of positive electrode current collector plates 15 (positive electrode tabs 15b) and the plurality of negative electrode current collector plates 16 (negative electrode tabs 16b) in the width direction are also aligned. In this state, the positive electrode bus bar 4 is joined to each of the plurality of positive electrode current collector plates 15, and the negative electrode bus bar 5 is joined to each of the plurality of negative electrode current collector plates 16, so that each positive electrode with respect to the positive electrode bus bar 4 in the width direction. The displacement of the current collector plate 15 can be reduced, and the displacement of the storage cell 7 of each negative electrode current collector plate 16 with respect to the negative electrode bus bar 5 can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

  For example, in the above-described embodiment, one power storage device 1 includes one positive electrode bus bar 4 and one negative electrode bus bar 5, but is not particularly limited thereto. One power storage device 1 may include a plurality of positive electrode bus bars 4 and a plurality of negative electrode bus bars 5.

  In the above embodiment, the positive electrode bus bar 4 and the negative electrode bus bar 5 are arranged side by side in the width direction on the same side in the height direction with respect to the cell stack 2, but are not limited to this form. The positive electrode bus bar 4 may be disposed on one side in the height direction with respect to the cell stack 2, and the negative electrode bus bar 5 may be disposed on the other side in the height direction with respect to the cell stack 2.

  In the above embodiment, the positive electrode bus bar 4 and the positive electrode current collector plate 15 are joined by welding. However, other methods may be used. The same applies to the joining of the negative electrode bus bar 5 and the negative electrode current collector plate 16.

  The cover member 6 may be formed of an insulating material. Examples of the insulating material forming the cover member 6 include polyimide, PP, PPS, and PA66. In this case, the possibility that the positive electrode bus bar 4 and the negative electrode bus bar 5 are short-circuited can be reduced. The cover member 6 can be omitted.

  The configuration for realizing the position regulation of the storage cell 7 in the width direction by the positive electrode bus bar 4 and the negative electrode bus bar 5 is not limited to the configuration of the above embodiment. For example, the positive bus bar 4 only needs to have a locking portion for locking the holding member 9A in the width direction, and the holding member 9A is engaged with the locking portion of the positive bus bar 4 in the width direction. What is necessary is just to have a stop part. In other words, the locking portion of the positive bus bar 4 and the locked portion of the holding member 9A only have to overlap when viewed from the width direction. Similarly, the negative electrode bus bar 5 only needs to have a locking portion for locking the holding member 9B in the width direction, and the holding member 9B is covered with the locking portion of the negative electrode bus bar 5 in the width direction. What is necessary is just to have a latching | locking part. In other words, it is only necessary that the locking portion of the negative electrode bus bar 5 and the locked portion of the holding member 9B overlap each other when viewed from the width direction. Hereinafter, first to fifth modifications will be described.

(First modification)
FIG. 9A and FIG. 9B are cross-sectional views of the power storage device according to the first modification. In the power storage device 1A shown in FIGS. 9A and 9B, the positive electrode bus bar 4 is provided with a plurality of recesses 42 instead of the configuration in which the positive electrode bus bar 4 includes a plurality of protrusions 41, and the negative electrode The bus bar 5 is provided with a plurality of concave portions 52 instead of the configuration including the plurality of convex portions 51, and the holding member 9A is provided with convex portions 92A instead of the configuration where the holding member 9A is provided with the concave portions 91A. And it replaces with the structure by which the recessed part 91B is provided in the holding member 9B, and the point which the holding member 9B is provided with the convex part 92B mainly differs from the electrical storage apparatus 1.

  The convex portion 92A is provided on the top surface 9a of the holding member 9A, and protrudes from the top surface 9a toward the positive electrode bus bar 4 along the height direction. The convex portion 92 </ b> A is provided on the side opposite to the negative electrode tab 16 b in the width direction, and is located below the positive electrode bus bar 4. The protrusion 92A has a top surface 92a that intersects the height direction, side surfaces 92b and 92c that intersect the width direction, and a pair of side surfaces (not shown) that intersect the stacking direction.

  The convex portion 92B is provided on the top surface 9a of the holding member 9B, and protrudes from the top surface 9a toward the negative electrode bus bar 5 along the height direction. The convex portion 92 </ b> B is provided on the side opposite to the positive electrode tab 15 b in the width direction and is located below the negative electrode bus bar 5. The convex portion 92B has a top surface 92f that intersects the height direction, side surfaces 92g and 92h that intersect the width direction, and a pair of side surfaces (not shown) that intersect the stacking direction.

  The plurality of recesses 42 are provided on the bottom surface 4 a of the positive electrode bus bar 4. The plurality of recesses 42 are arranged along the stacking direction, and are provided every other holding member 9 (power storage cell 7). Specifically, the recess 42 is provided for the storage cell 7A and is not provided for the storage cell 7B. The concave portion 42 has a shape that fits with the convex portion 92A of the holding member 9A. The recess 42 includes a bottom surface 42a that intersects the height direction, side surfaces 42b and 42c that intersect the width direction, and a pair of side surfaces (not shown) that intersect the stacking direction.

  The plurality of recesses 52 are provided on the bottom surface 5 a of the negative electrode bus bar 5. The plurality of recesses 52 are arranged along the stacking direction and are provided every other holding member 9 (power storage cell 7). Specifically, the recess 52 is provided for the power storage cell 7B and is not provided for the power storage cell 7A. The concave portion 52 has a shape that fits with the convex portion 92B of the holding member 9B. The recess 52 has a bottom surface 52a that intersects the height direction, side surfaces 52b and 52c that intersect the width direction, and a pair of side surfaces (not shown) that intersect the stacking direction.

  In the power storage device 1 </ b> A, the convex portion 92 </ b> A is fitted in the concave portion 42. That is, the side surfaces 92b and 92c are opposed to and in contact with the side surfaces 42b and 42c in the width direction. With this configuration, the holding member 9A is suppressed from moving in the width direction. That is, the concave portion 42 functions as a locking portion (first locking portion) that locks the holding member 9A in the width direction, and the convex portion 92A is a locked portion (first portion) that faces the concave portion 42 in the width direction. Functions as a locked portion). Thereby, it is suppressed that each electrical storage cell 7A moves to the width direction with respect to the positive electrode bus bar 4.

  Similarly, the movement of the holding member 9A is suppressed in the stacking direction. That is, the concave portion 42 also functions as a locking portion that locks the holding member 9A in the stacking direction, and the convex portion 92A also functions as a locked portion that faces the concave portion 42 in the stacking direction. Thereby, it is suppressed that each electrical storage cell 7A moves to the lamination direction with respect to the positive electrode bus bar 4. From the above, the relative position of the storage cell 7A with respect to the positive electrode bus bar 4 is defined in the width direction and the stacking direction.

  Similarly, in the power storage device 1A, the convex portion 92B fits into the concave portion 52. That is, the side surfaces 92g and 92h are opposed to and in contact with the side surfaces 52b and 52c in the width direction. With this configuration, the holding member 9B is suppressed from moving in the width direction. That is, the concave portion 52 functions as a locking portion (second locking portion) that locks the holding member 9B in the width direction, and the convex portion 92B is a locked portion (second portion) that faces the concave portion 52 in the width direction. Functions as a locked portion). Thereby, it is suppressed that each electrical storage cell 7B moves in the width direction with respect to the negative electrode bus bar 5.

  Similarly, the movement of the holding member 9B is suppressed in the stacking direction. That is, the concave portion 52 functions as a locking portion that locks the holding member 9B in the stacking direction, and the convex portion 92B also functions as a locked portion that faces the concave portion 52 in the stacking direction. Thereby, it is suppressed that each electrical storage cell 7B moves to the lamination direction with respect to the negative electrode bus bar 5. From the above, the relative position of the storage cell 7B with respect to the negative electrode bus bar 5 is defined in the width direction and the stacking direction.

  Therefore, the same effect as the power storage device 1 can be obtained in the power storage device 1A. In addition, when holding the ends of the current collector 12 in the holding members 9A and 9B, the holding members 9A and 9B are provided so that the positive electrode bus bar 4 and the negative electrode bus bar 5 and the current collector 12 do not come into contact with each other and are short-circuited. It is required to have a certain thickness. In this regard, in the power storage device 1, since the concave portions 91A and 91B are provided on the top surfaces 9a of the holding members 9A and 9B, the entire top surface 9a of the holding members 9A and 9B is secured in order to ensure the above-described thickness. It is necessary to increase the thickness in the height direction. On the other hand, in the power storage device 1A, since the concave portions are not provided on the top surfaces 9a of the holding members 9A and 9B, the thickness in the height direction of the entire top surface 9a of the holding members 9A and 9B is larger than that of the power storage device 1. Can be thinned.

  The side surface 92b may be in contact with the side surface 42b in the width direction or may be separated from the side surface 92b. The side surface 92c may be in contact with the side surface 42c in the width direction or may be separated. In any case, when the holding member 9A attempts to move in the width direction, at least one of the side surface 92b and the side surface 92c abuts against the opposing side surface (the side surface 42b or the side surface 42c). Thereby, it is suppressed that 9 A of holding members move in the width direction. Similarly, the side surface 92g may be in contact with the side surface 52b in the width direction or may be separated. Similarly, the side surface 92h may be in contact with the side surface 52c in the width direction or may be separated. In any case, when the holding member 9B attempts to move in the width direction, at least one of the side surface 92g and the side surface 92h abuts against the opposing side surface (side surface 52b or side surface 52c). Thereby, it is suppressed that the holding member 9B moves in the width direction.

(Second modification)
FIG. 10A and FIG. 10B are cross-sectional views of a power storage device according to a second modification. In the power storage device 1B shown in FIG. 10A and FIG. 10B, the positive electrode bus bar 4 is provided with a plurality of through holes 43 instead of the configuration in which the positive electrode bus bar 4 includes a plurality of convex portions 41. Instead of the configuration in which the negative electrode bus bar 5 includes a plurality of convex portions 51, a plurality of through holes 53 are provided in the negative electrode bus bar 5, and in place of the configuration in which the concave portions 91A are provided in the holding member 9A, the holding member 9A has the protruding portions 93A. It differs mainly from the electrical storage apparatus 1 in that the holding member 9B is provided with a protruding portion 93B instead of the configuration in which the holding member 9B is provided with the recess 91B. In this example, each holding member 9A includes two projecting portions 93A, and the positive electrode bus bar 4 is provided with two through holes 43 for each holding member 9A. Similarly, each holding member 9B includes two protrusions 93B, and the negative electrode bus bar 5 is provided with two through holes 53 for each holding member 9B.

  Each of the plurality of through holes 43 is a through hole that penetrates the positive electrode bus bar 4 in the height direction. The plurality of through holes 43 are arranged along the stacking direction, and are provided every other holding member 9 (power storage cell 7). Specifically, the through hole 43 is provided for the electricity storage cell 7A and is not provided for the electricity storage cell 7B. The two through holes 43 corresponding to one holding member 9 </ b> A are spaced apart from each other in the width direction of the positive electrode bus bar 4. Each of the plurality of through holes 53 is a through hole that penetrates the negative electrode bus bar 5 in the height direction. The plurality of through-holes 53 are arranged along the stacking direction, and are provided every other holding member 9 (power storage cell 7). Specifically, the through hole 53 is provided for the power storage cell 7B and is not provided for the power storage cell 7A. Two through holes 53 corresponding to one holding member 9 </ b> B are spaced apart in the width direction of the negative electrode bus bar 5.

  The protruding portion 93A is provided on the top surface 9a of the holding member 9A, and protrudes from the top surface 9a toward the positive electrode bus bar 4 along the height direction. The two protrusions 93A are spaced apart from each other in the width direction of the holding member 9A. The protruding portion 93 </ b> A has a shape that can be inserted into the through hole 43. The protruding portion 93A has, for example, a cylindrical shape. The protruding portion 93A has an outer peripheral surface 93a. The protruding portion 93B is provided on the top surface 9a of the holding member 9B, and protrudes from the top surface 9a toward the negative electrode bus bar 5 along the height direction. The two protrusions 93B are spaced apart from each other in the width direction of the holding member 9B. The protruding portion 93 </ b> B has a shape that can be inserted into the through hole 53. The protrusion 93B has, for example, a cylindrical shape. The protrusion 93B has an outer peripheral surface 93b.

  In the power storage device 1 </ b> B, the protruding portion 93 </ b> A is inserted through the through hole 43, and the outer peripheral surface 93 a faces the inner peripheral surface 43 a that defines the through hole 43 over the entire periphery. With this configuration, the holding member 9A is suppressed from moving in the width direction and the stacking direction. That is, the inner peripheral surface 43a of the through hole 43 functions as a locking portion (first locking portion) that locks the holding member 9A in the width direction and the stacking direction, and the protruding portion 93A is in the width direction and the stacking direction. It functions as a locked portion (first locked portion) facing the inner peripheral surface 43a. Thereby, it is suppressed that each electrical storage cell 7A moves to the positive electrode bus bar 4 in the width direction and the stacking direction. As a result, the relative position of the storage cell 7A with respect to the positive electrode bus bar 4 is defined in the width direction and the stacking direction.

  Similarly, in the power storage device 1B, the protruding portion 93B is inserted through the through hole 53, and the outer peripheral surface 93b faces the inner peripheral surface 53a that defines the through hole 53 over the entire periphery. With this configuration, the holding member 9B is suppressed from moving in the width direction and the stacking direction. That is, the inner peripheral surface 53a of the through hole 53 functions as a locking portion (second locking portion) that locks the holding member 9B in the width direction and the stacking direction, and the protruding portion 93B is in the width direction and the stacking direction. It functions as a locked portion (second locked portion) facing the inner peripheral surface 53a. Thereby, it is suppressed that each electrical storage cell 7B moves to the width direction and the lamination direction with respect to the negative electrode bus bar 5. As a result, the relative position of the storage cell 7B with respect to the negative electrode bus bar 5 is defined in the width direction and the stacking direction.

  Therefore, power storage device 1B has the same effect as power storage device 1A. Note that the number of protrusions 93A provided in each holding member 9A is not limited to two. The number of through holes 43 provided in the positive electrode bus bar 4 per one holding member 9A is not limited to two. Similarly, the number of protrusions 93B included in each holding member 9B is not limited to two. The number of through holes 53 provided in the negative electrode bus bar 5 per one holding member 9B is not limited to two. Moreover, the outer peripheral surface 93a of the protrusion 93A may be in contact with the inner peripheral surface 43a of the through hole 43 or may be separated. In any case, when the holding member 9A attempts to move in the width direction, the outer peripheral surface 93a contacts the inner peripheral surface 43a, so that the holding member 9A is suppressed from moving in the width direction. Similarly, the outer peripheral surface 93b of the projecting portion 93B may be in contact with the inner peripheral surface 53a of the through hole 53 or may be separated. In any case, when the holding member 9B tries to move in the width direction, the outer peripheral surface 93b contacts the inner peripheral surface 53a, so that the holding member 9B is suppressed from moving in the width direction.

(Third Modification)
FIG. 11 is a plan view partially showing a cell stack included in the power storage device according to the third modification. FIG. 12 is a cross-sectional view of a power storage device according to a third modification. As shown in FIGS. 11 and 12, the power storage device 1 </ b> C includes a convex portion in which the negative electrode tab 16 b is bent in the opposite direction to the positive electrode tab 15 b and the positive electrode bus bar 4 is replaced with a plurality of convex portions 41. 44, the negative electrode bus bar 5 is provided with convex portions 54 instead of the plurality of convex portions 51, and the holding member 9 is provided with concave portions 94A and 94B instead of the concave portions 91A and 91B. Mainly different.

  In the third modification, the holding member 9 provided with both the positive electrode tab 15b and the negative electrode tab 16b on the top surface 9a of the holding member 9, and the holding member provided with neither the positive electrode tab 15b nor the negative electrode tab 16b. 9 are alternately arranged along the stacking direction.

  The convex portion 44 is provided on the bottom surface 4a of the positive electrode bus bar 4, and projects from the bottom surface 4a toward the holding member 9 along the height direction. The convex portion 44 is located at one end near the cover member 6 in the width direction of the positive electrode bus bar 4. The convex portion 44 extends along the stacking direction. The convex portion 44 has a top surface 44a that intersects the height direction, and side surfaces 44b and 44c that intersect the width direction.

  The convex portion 54 is provided on the bottom surface 5a of the negative electrode bus bar 5, and protrudes from the bottom surface 5a toward the holding member 9 along the height direction. The convex portion 54 is located at one end near the cover member 6 in the width direction of the negative electrode bus bar 5. The convex portion 54 extends along the stacking direction. The convex portion 54 has a top surface 54a that intersects the height direction, and side surfaces 54b and 54c that intersect the width direction.

  The top surface 9a of the holding member 9 is provided with a recess 94A and a recess 94B. The concave portion 94A and the concave portion 94B are arranged to be separated from each other in the width direction. The recess 94A is located below the positive electrode bus bar 4 (projection 44). The recess 94A penetrates the holding member 9 in the stacking direction. The concave portion 94A has a shape that fits with the convex portion 44 of the positive electrode bus bar 4. The recess 94A has a bottom surface 94a that intersects the height direction and side surfaces 94b and 94c that intersect the width direction. The recess 94B is located below the negative electrode bus bar 5 (projection 54). The recess 94B penetrates the holding member 9 in the stacking direction. The concave portion 94B has a shape that fits with the convex portion 54 of the negative electrode bus bar 5. The recess 94B has a bottom surface 94d that intersects the height direction, and side surfaces 94e and 94f that intersect the width direction.

  In the power storage device 1C, the convex portion 44 fits into the concave portion 94A. That is, the side surface 94b is opposed to and in contact with the side surface 44b in the width direction. The side surface 94c faces and contacts the side surface 44c in the width direction. Similarly, in the power storage device 1C, the convex portion 54 fits into the concave portion 94B. That is, the side surface 94e faces and contacts the side surface 54b in the width direction. The side surface 94f faces and abuts the side surface 54c in the width direction.

  With this configuration, even when force is applied to each storage cell 7 along the width direction due to vibration, the holding member 9 is suppressed from moving in the width direction. That is, the convex portion 44 functions as a locking portion (first locking portion or third locking portion) that locks the holding member 9 in the width direction, and the concave portion 94A faces the convex portion 44 in the width direction. It functions as a locked portion (first locked portion, third locked portion). Similarly, the convex portion 54 functions as a locking portion (second locking portion) that locks the holding member 9 in the width direction, and the concave portion 94B is a locked portion that faces the convex portion 54 in the width direction (second locking portion). 2nd to-be-latched part). Thereby, it is suppressed that each electrical storage cell 7 moves to the width direction with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5. Thereby, the relative position of the electrical storage cell 7 with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5 is defined in the width direction.

  Therefore, the same effect as that of the power storage device 1 can be obtained in the power storage device 1C. The side surfaces 94b, 94c, 94e, and 94f may be in contact with the side surfaces 44b, 44c, 54b, and 54c in the width direction, or may be separated from each other. In any case, when the holding member 9 tries to move in the width direction, at least one of the side surfaces 94b, 94c, 94e, and 94f abuts on the opposing side surface (side surfaces 44b, 44c, 54b, and 54c). Thereby, it is suppressed that the holding member 9 moves in the width direction.

(Fourth modification)
FIG. 13 is a cross-sectional view of a power storage device according to a fourth modification. The power storage device 1D shown in FIG. 13 includes a positive bus bar 4A instead of the positive bus bar 4, a negative bus bar 5A instead of the negative bus bar 5, and the holding member 9 is not provided with recesses 91A and 91B. However, it is mainly different from the power storage device 1.

  The positive electrode bus bar 4A is mainly different from the positive electrode bus bar 4 in shape. Specifically, the positive electrode bus bar 4A has an L shape when viewed from the stacking direction. The positive electrode bus bar 4A includes a first portion 45 provided along the top surface 9a (the top surface of the cell stack 2) of the holding member 9, and a side surface 9b (side surface of the cell stack 2) of the holding member 9 in the width direction. And a second portion 46 to be provided.

  The negative electrode bus bar 5A is mainly different from the negative electrode bus bar 5 in shape. Specifically, the negative electrode bus bar 5A has an L shape when viewed from the stacking direction. The negative electrode bus bar 5A includes a first portion 55 provided along the top surface 9a (the top surface of the cell stack 2) of the holding member 9, and a side surface 9c (side surface of the cell stack 2) of the holding member 9 in the width direction. And a second portion 56 provided. The side surface 9c is a surface opposite to the side surface 9b.

  In power storage device 1D, first portion 45 abuts on top surface 9a, and second portion 46 abuts on side surface 9b. Similarly, in power storage device 1D, first portion 55 abuts on top surface 9a and second portion 56 abuts on side surface 9c. That is, the position of the top surface 9 a of each holding member 9 is defined by the first portion 45 and the first portion 55. The position of the side surface 9b of each holding member 9 is defined by the second portion 46, and the position of the side surface 9c of each holding member 9 is defined by the second portion 56.

  Thereby, it is suppressed that the holding member 9 moves not only in the height direction but also in the width direction. That is, the second portion 46 functions as a locking portion (a first locking portion or a third locking portion) that locks the holding member 9 in the width direction, and the side surface 9b is in contact with the second portion 46 in the width direction. It functions as an opposite locked part (first locked part, third locked part). Therefore, each power storage cell 7 is restrained from moving in the width direction with respect to the positive electrode bus bar 4, so that the relative position of the power storage cell 7 with respect to the positive electrode bus bar 4 is defined in the width direction. Similarly, the second portion 56 functions as a locking portion (second locking portion) that locks the holding member 9 in the width direction, and the side surface 9c is locked to face the second portion 56 in the width direction. Functions as a portion (second locked portion). Therefore, since each power storage cell 7 is suppressed from moving in the width direction with respect to the negative electrode bus bar 5, the relative position of the power storage cell 7 with respect to the negative electrode bus bar 5 is defined in the width direction.

  Therefore, power storage device 1D has the same effect as power storage device 1A. Power storage device 1D may include positive electrode bus bar 4A and negative electrode bus bar 5 or may include positive electrode bus bar 4 and negative electrode bus bar 5A. Further, the side surface 9b may be in contact with the second portion 46 or may be separated. Similarly, the side surface 9c may be in contact with the second portion 56 or may be separated. In any case, when the holding member 9 tries to move in the width direction, at least one of the side surface 9b and the side surface 9c comes into contact with the opposing second portion (the second portion 46 or the second portion 56). The movement of the member 9 in the width direction is suppressed.

(5th modification)
FIG. 14 is a cross-sectional view of a power storage device according to a fifth modification. In the power storage device 1E shown in FIG. 14, the positive electrode bus bar 4 does not include a plurality of convex portions 41, the negative electrode bus bar 5 does not include a plurality of convex portions 51, and the holding member 9 is provided with concave portions 91A and 91B. It is mainly different from the electrical storage apparatus 1 in that the holding member 9 includes projecting portions 95A, 95B, 96A, and 96B instead of the configuration described above.

  The positive electrode bus bar 4 has an end face 4b and an end face 4c in the width direction. The end surface 4b is a surface facing the end surface of the cover member 6 in the width direction. The end surface 4c is a surface opposite to the end surface 4b, and faces the outside of the power storage device 1E. The negative electrode bus bar 5 has an end face 5b and an end face 5c in the width direction. The end surface 5b is a surface facing the end surface of the cover member 6 in the width direction. End surface 5c is the surface opposite to end surface 5b, and faces the outside of power storage device 1E.

  The protrusions 95A and 96A are provided on the top surface 9a and protrude from the top surface 9a along the height direction. Protrusions 95A and 96A are spaced apart so as to sandwich positive electrode bus bar 4 in the width direction. The protruding portion 95A is located on the cover member 6 side, and the protruding portion 96A is located outside. The protruding portion 95A has a side surface 95a that intersects the width direction. The protruding portion 96 </ b> A has a side surface 96 a that intersects the width direction and faces the side surface 95 a with the positive electrode bus bar 4 interposed therebetween. The side surface 95a faces the end surface 4b in the width direction. The side surface 96a faces the end surface 4c in the width direction. The height (length in the height direction) of the protrusions 95A and 96A is higher than the thickness (length in the height direction) of the positive electrode bus bar 4. The protrusions 95A and 96A protrude upward from the upper surface of the positive electrode bus bar 4, for example.

  The protrusions 95B and 96B are provided on the top surface 9a and protrude from the top surface 9a along the height direction. Protrusions 95B and 96B are spaced apart so as to sandwich negative electrode bus bar 5 in the width direction. The protrusion 95B is located on the cover member 6 side, and the protrusion 96B is located on the outside. The protrusion 95B has a side surface 95b that intersects the width direction. The protruding portion 96B has a side surface 96b that intersects the width direction and faces the side surface 95b with the negative electrode bus bar 5 interposed therebetween. The side surface 95b faces the end surface 5b in the width direction. The side surface 96b faces the end surface 5c in the width direction. The heights (length in the height direction) of the protrusions 95B and 96B are higher than the thickness (length in the height direction) of the negative electrode bus bar 5. The protruding portions 95B and 96B protrude upward from the upper surface of the negative electrode bus bar 5, for example.

  With this configuration, when a force in the direction from the positive electrode bus bar 4 to the negative electrode bus bar 5 is applied to each storage cell 7 due to vibration, the side surface 96a of the projecting portion 96A abuts the end surface 4c in the width direction, and the projecting portion 95B The side surface 95b contacts the end surface 5b in the width direction. For this reason, it is suppressed that the holding member 9 moves to the direction which goes to the negative electrode bus bar 5 from the positive electrode bus bar 4. FIG. Further, when a force in the direction from the negative electrode bus bar 5 toward the positive electrode bus bar 4 is applied to each storage cell 7 due to vibration, the side surface 95a of the protruding portion 95A abuts on the end surface 4b in the width direction, and the side surface 96b of the protruding portion 96B. Contacts the end surface 5c in the width direction. For this reason, it is suppressed that the holding member 9 moves to the direction which goes to the positive electrode bus bar 4 from the negative electrode bus bar 5. FIG.

  That is, the end surfaces 4b and 4c function as locking portions (first locking portion and third locking portion) that lock the holding member 9 in the width direction, and the protruding portions 95A and 96A are connected to the end surfaces 4b and 4c. It functions as a locked portion (first locked portion, third locked portion) that opposes each other in the width direction. Similarly, the end surfaces 5b and 5c function as a locking portion (second locking portion) that locks the holding member 9 in the width direction, and the protruding portions 95B and 96B face the end surfaces 5b and 5c, respectively, in the width direction. Functions as a locked portion (second locked portion). Thereby, since each electrical storage cell 7 is suppressed from moving in the width direction with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5, the relative position of the electrical storage cell 7 with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5 in the width direction. Is defined.

  Therefore, the power storage device 1E has the same effect as the power storage device 1. Further, in the power storage device 1E, since the protruding portion 96A protrudes above the upper surface of the positive electrode bus bar 4, the end surface 4c of the positive electrode bus bar 4 is covered by each protruding portion 96A. Thereby, when the electrical storage apparatus 1E is accommodated in a housing | casing, possibility that the positive electrode bus bar 4 will contact a housing | casing can be reduced. Similarly, since the protruding portion 96B protrudes upward from the upper surface of the negative electrode bus bar 5, the end surface 5c of the negative electrode bus bar 5 is covered by each protruding portion 96B. Thereby, when the electrical storage apparatus 1E is accommodated in a housing | casing, possibility that the negative electrode bus bar 5 will contact a housing | casing can be reduced.

  Note that the upper end of the protruding portion 96 </ b> A may be lower than the upper surface of the positive electrode bus bar 4. Even in this case, a clearance (separation distance) between the positive electrode bus bar 4 and the casing can be ensured by interposing the protruding portion 96A between the positive electrode bus bar 4 and the casing. Thereby, possibility that the positive electrode bus bar 4 will contact a housing | casing can be reduced. Similarly, the upper end of the protrusion 96 </ b> B may be lower than the upper surface of the negative electrode bus bar 5. For the same reason, the clearance (separation distance) between the negative electrode bus bar 5 and the housing can be ensured, so that the possibility that the negative electrode bus bar 5 contacts the housing can be reduced.

  Furthermore, in the power storage device 1E, the protruding portion 95A protrudes upward from the upper surface of the positive electrode bus bar 4, and the protruding portion 95B protrudes upward from the upper surface of the negative electrode bus bar 5. The end surface 4b of the bus bar 4 is covered, and the end surface 5b of the negative electrode bus bar 5 is covered by each protrusion 95B. Thereby, the possibility that the positive electrode bus bar 4 and the negative electrode bus bar 5 are short-circuited via the cover member 6 can be reduced.

  Note that the upper end of the protruding portion 95 </ b> A may be lower than the upper surface of the positive electrode bus bar 4. Similarly, the upper end of the protruding portion 95 </ b> B may be lower than the upper surface of the negative electrode bus bar 5. Even in this case, since the protruding portion 95A is interposed between the positive electrode bus bar 4 and the cover member 6, the clearance (separation distance) between the positive electrode bus bar 4 and the cover member 6 can be secured, and the negative electrode bus bar 5 and the cover Since the protruding portion 95B is interposed between the member 6 and the member 6, the clearance (separation distance) between the negative electrode bus bar 5 and the cover member 6 can be ensured. Thereby, the possibility that the positive electrode bus bar 4 and the negative electrode bus bar 5 are short-circuited via the cover member 6 can be reduced.

  In addition, the holding member 9 should just be provided with at least any one of protrusion part 95A, 95B, 96A, 96B. Further, the side surfaces 95a, 96a, 95b, and 96b may be in contact with the end surfaces 4b, 4c, 5b, and 5c, or may be separated from each other. In any case, when the holding member 9 tries to move in the width direction, at least one of the side surfaces 95a, 96a, 95b, 96b comes into contact with the opposing end surfaces (end surfaces 4b, 4c, 5b, 5c). The movement of the member 9 in the width direction is suppressed.

  By the way, as shown in FIG. 15, two cell stacks 2 may be connected in parallel. The power storage device 1 </ b> F includes two power storage modules 20 and bus bars 21 and 22 that electrically connect the power storage modules 20. As each power storage module 20, a power storage device 1E is used. The two power storage modules 20 are arranged in the same direction and are arranged side by side in the width direction. That is, the positive electrode bus bar 4 of one power storage module 20 and the negative electrode bus bar 5 of the other power storage module 20 are adjacent to each other in the width direction. Each of the bus bars 21 and 22 is a member that electrically connects the two power storage modules 20. The bus bar 21 connects the positive electrode bus bars 4 to each other, and the bus bar 22 connects the negative electrode bus bars 5 to each other.

  Here, in order to reduce the size of the power storage device 1F, the separation distance D (see FIG. 16) between the two power storage modules 20 may be shortened. In this case, since the positive electrode bus bar 4 of one power storage module 20 and the negative electrode bus bar 5 of the other power storage module 20 are close to each other, the positive electrode bus bar 4 and the negative electrode bus bar 5 may be short-circuited. Although it is conceivable to reduce the possibility of short circuit by reducing the width of the positive electrode bus bar 4 and the width of the negative electrode bus bar 5, in order to reduce the electrical resistance of the positive electrode bus bar 4 and the negative electrode bus bar 5, It is desirable to ensure the width and the width of the negative electrode bus bar 5.

  As shown in FIG. 16, in the power storage device 1F, each holding member 9 of one power storage module 20 includes a protruding portion 96A, and each holding member 9 of the other power storage module 20 includes a protruding portion 96B. . For this reason, the end surface 4c of the positive electrode bus bar 4 is covered with each protrusion 96A, and the end surface 5c of the negative electrode bus bar 5 is covered with each protrusion 96B. Thereby, the possibility that the positive electrode bus bar 4 and the negative electrode bus bar 5 are short-circuited can be reduced without reducing the width of the positive electrode bus bar 4 and the width of the negative electrode bus bar 5.

  Note that the upper end of the protruding portion 96 </ b> A may be lower than the upper surface of the positive electrode bus bar 4. Similarly, the upper end of the protrusion 96 </ b> B may be lower than the upper surface of the negative electrode bus bar 5. Even in this case, a clearance (separation distance) between the positive electrode bus bar 4 and the negative electrode bus bar 5 can be ensured by interposing the protruding portions 96A and 96B between the positive electrode bus bar 4 and the negative electrode bus bar 5 adjacent to each other. Therefore, the possibility that the positive electrode bus bar 4 and the negative electrode bus bar 5 are short-circuited can be reduced.

  In the power storage devices 1 </ b> C, 1 </ b> D, 1 </ b> E, and 1 </ b> F, the power storage cell 7 can move in the stacking direction with respect to the positive electrode bus bar 4 and the negative electrode bus bar 5. As shown in FIG. 17, positive electrode bus bar 4 of power storage devices 1 </ b> C, 1 </ b> D, 1 </ b> E, and 1 </ b> F may further include a protrusion 47. The protrusion 47 is provided on the bottom surface 4a and protrudes downward from the bottom surface 4a along the height direction. The protruding portion 47 extends along the outer side surface 17 a of the insulating buffer member 17.

  With this configuration, the holding member 9 is suppressed from moving in the stacking direction. That is, the protruding portion 47 functions as a locking portion that locks the holding member 9 in the stacking direction, and the insulating buffer member 17 functions as a locked portion that faces the protruding portion 47 in the stacking direction. For this reason, it is suppressed that each electrical storage cell 7 moves to the lamination direction with respect to the positive electrode bus bar 4. Thereby, the relative position of the electrical storage cell 7 with respect to the positive electrode bus bar 4 is defined in the stacking direction. The negative electrode bus bar 5 may include the same protrusion. In this case, the relative position of the storage cell 7 with respect to the negative electrode bus bar 5 is defined in the stacking direction.

  1, 1A, 1B, 1C, 1D, 1E ... power storage device, 2 ... cell stack, 3 ... end plate, 4, 4A ... positive bus bar (first bus bar), 4b, 4c ... end face (first locking portion, first 3 locking portion), 5, 5A ... negative electrode bus bar (second bus bar), 5b, 5c ... end face (second locking portion), 7 ... electricity storage cell, 7A ... electricity storage cell (first electricity storage cell), 7B ... electricity storage. Cell (second storage cell), 9 ... holding member, 9A ... holding member (first holding member), 9B ... holding member (second holding member), 9a ... top surface, 9b ... side surface (first locked portion) , Third locked portion), 9c ... side surface (second locked portion), 10 ... bipolar electrode, 15 ... positive current collector (first current collector), 16 ... negative current collector (second current collector) Electrode plate), 41 ... convex portion (first locking portion), 42 ... concave portion (first locking portion), 43 ... through hole, 43a ... inner peripheral surface (first locking portion), 44 ... convex (1st locking part, 3rd locking part), 45 ... 1st part, 46 ... 2nd part (1st locking part, 3rd locking part), 51 ... Convex part (2nd locking part) , 52 ... concave part (second locking part), 53 ... through hole, 53a ... inner peripheral surface (second locking part), 54 ... convex part (second locking part), 55 ... first part, 56 ... Second portion (second locking portion), 91A ... concave portion (first locked portion), 91B ... concave portion (second locked portion), 92A ... convex portion (first locked portion), 92B ... Projection (second locked portion), 93A ... protruding portion (first locked portion), 93B ... protruding portion (second locked portion), 94A ... recessed portion (first locked portion, third) Locked portion), 94B ... concave portion (second locked portion), 95A ... protruding portion (first locked portion, third locked portion), 95B ... protruding portion (second locked portion) 96A: Protruding part (first locked part, third locked part), 96B: Protruding part (second locked part) , W1 ... weld, W2 ... weld.

Claims (10)

A cell stack including a plurality of power storage cells stacked along the first direction alternately through the first current collector plate and the second current collector plate;
A first bus bar extending along the first direction and joined to the first current collector plate in a second direction intersecting the first direction;
A second bus bar extending along the first direction and joined to the second current collector plate in the second direction;
With
Each of the plurality of power storage cells includes a plurality of electrodes stacked along the first direction, and a holding member that holds the plurality of electrodes.
The first bus bar is a first locking portion for locking a first holding member of the first power storage cell among the plurality of power storage cells in a third direction intersecting the first direction and the second direction. Have
The power storage device, wherein the first holding member includes a first locked portion that faces the first locking portion in the third direction. The first bus bar has a convex portion protruding toward the first holding member along the second direction,
The first holding member is provided with a concave portion that fits with the convex portion,
The first locking portion is the convex portion,
The power storage device according to claim 1, wherein the first locked portion is the recess. The first holding member has a convex portion protruding toward the first bus bar along the second direction,
The first bus bar is provided with a concave portion that fits the convex portion,
The first locking portion is the recess;
The power storage device according to claim 1, wherein the first locked portion is the convex portion. The first bus bar is provided with a through-hole penetrating the first bus bar in the second direction,
The first holding member has a protrusion that protrudes toward the first bus bar along the second direction and is inserted into the through hole.
The first locking portion is an inner peripheral surface that defines the through hole,
The power storage device according to claim 1, wherein the first locked portion is the protruding portion. The first bus bar includes a first portion provided along a top surface of the first holding member in the second direction, and a second portion provided along a side surface of the first holding member in the third direction. Have
The first locking portion is the second portion;
The power storage device according to claim 1, wherein the first locked portion is the side surface. The first bus bar has an end surface in the third direction,
The first holding member protrudes along the second direction and has a protruding portion facing the end surface in the third direction,
The first locking portion is the end face;
The power storage device according to claim 1, wherein the first locked portion is the protruding portion.   The power storage device according to claim 6, wherein the protruding portion is provided at an end portion of the first holding member in the third direction. The second bus bar has a second locking portion for locking the second holding member of the second power storage cell among the plurality of power storage cells in the third direction,
The power storage device according to claim 1, wherein the second holding member includes a second locked portion that faces the second locking portion in the third direction. The first bus bar has a third locking portion for locking the second holding member in the third direction,
The power storage device according to claim 8, wherein the second holding member has a third locked portion that faces the third locking portion in the third direction. Forming a cell stack by laminating a plurality of power storage cells along a first direction alternately through a first current collector plate and a second current collector plate;
Disposing a pair of end plates at both ends in the first direction of the cell stack;
Arranging a first bus bar and a second bus bar extending along the first direction on a top surface in a second direction intersecting the first direction of the cell stack;
Joining the first bus bar and the first current collector plate and joining the second bus bar and the second current collector plate;
With
The plurality of power storage cells include a plurality of first power storage cells and a plurality of second power storage cells,
The plurality of first power storage cells and the plurality of second power storage cells are alternately arranged one by one along the first direction,
Each of the plurality of first power storage cells includes a plurality of first electrodes stacked along the first direction, and a first holding member that holds the plurality of first electrodes,
Each of the plurality of second power storage cells has a plurality of second electrodes stacked along the first direction, and a second holding member that holds the plurality of second electrodes,
The first bus bar has a first locking portion for locking the first holding member in a third direction intersecting the first direction and the second direction,
The first holding member has a first locked portion facing the first locking portion in the third direction,
The second bus bar has a second locking portion for locking the second holding member in the third direction,
The second holding member has a second locked portion that faces the second locking portion in the third direction,
When the first bus bar is disposed, the first locking portion and the first locked portion are brought into contact with each other in the third direction, and the second bus bar is disposed when the second bus bar is disposed. The manufacturing method of the electrical storage apparatus by which the position in the said 3rd direction of the said several electrical storage cell is arrange | equalized by making a part and a said 2nd to-be-latched part contact | abut in the said 3rd direction.

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