JP6287507B2 - Power storage device, holder, and method of assembling power storage device - Google Patents

Description

  The present invention relates to a power storage device including a power storage element and a holder.

  A power storage device in which a power storage element (battery cell) is stacked on a holder such as a spacer is known. As an example of this power storage device, an assembled battery (battery module) in which a plurality of power storage elements are stacked with a spacer interposed therebetween can be given.

  In this type of power storage device, in general, the holder is composed of a main plate portion overlaid on the power storage element and a plurality of flange portions formed on the peripheral edge of the main plate portion. Each flange part is arrange | positioned so as to oppose the outer peripheral surface of an electrical storage element, and positions this electrical storage element.

  Patent Document 1 discloses an assembled battery in which a plurality of triangular ribs are projected from a lower surface flange portion of a spacer. According to the technique of Patent Document 1, the lower surfaces of the energy storage elements are guided upward by the inclined surfaces of the triangular ribs, so that the upper surfaces of all the energy storage elements are reliably pressed against the upper surface flange portions of the spacers. Thereby, shakiness of the electricity storage element can be suppressed, and the height of the upper surface of the electricity storage element can be made uniform.

JP 2010-176997 A

  However, there is variation due to product tolerances in the height from the upper surface of the power storage element to the upper end of the terminal provided on the surface. Therefore, when the technique of Patent Document 1 is adopted, the heights of the terminals of the power storage elements cannot be strictly aligned. If the height of the terminal varies, for example, when connecting a plurality of terminals with a bus bar, a connection failure may occur due to the inclination of the bus bar.

  Therefore, an object of the present invention is to enable precise positioning of a power storage element in a power storage device in which a power storage element is stacked on a holder.

A power storage device according to the present invention includes a power storage element and a holder,
The holder is
A first restricting portion for restricting movement of the power storage element from one side;
A second restricting portion for restricting movement of the power storage element from the other side;
A first guide part protruding from the first restricting part and contacting the power storage element;
And a second guide part that protrudes from the second restricting part and abuts against the power storage element.

  According to the power storage device of the present invention, when assembling the power storage device by overlapping the power storage element and the holder, while deforming at least one of the first guide portion or the second guide portion of the holder, A power storage element can be inserted between the second regulating portion. Therefore, by inserting the power storage element between the first guide part and the second guide part while restricting relative movement of the holder with respect to the power storage element, at least one of the first guide part or the second guide part is deformed to an appropriate amount. In the state, the storage element is held in the holder. Thereby, an electrical storage element can be positioned exactly with respect to a holder.

  In the power storage device according to the above invention, the first guide portion may be more easily deformed than the second guide portion. In this case, since the deformation amount of the first guide portion is larger than the deformation amount of the second guide portion, the electric storage element can be positioned in a state of being brought closer to the first restricting portion side.

  In the power storage device according to the above invention, when the first guide portion is more easily deformed than the second guide portion, and the power storage element includes a terminal surface from which a terminal protrudes, the terminal surface is 1 It may be arranged opposite to the restricting portion. In this case, by appropriately adjusting the deformation amount of the first guide part, the power storage element can be accurately positioned so that an appropriate amount of the terminal of the power storage element protrudes from the first restricting part of the holder. In addition, when a plurality of power storage elements are stacked, it becomes easy to align the protruding amounts of the plurality of terminals, and thereby, for example, connection between terminals by a bus bar can be performed satisfactorily.

  In the power storage device according to the above invention, when the first guide part is more easily deformed than the second guide part, a temperature adjustment member is disposed on the opposite side of the power storage element across the first restriction part. May be. In this case, since the power storage element is positioned close to the first restricting portion to prevent the distance from the temperature adjustment member from being increased, the power storage element is effectively cooled or heated by the temperature adjustment member. can do.

  In the power storage device according to the above invention, when the first guide part is more easily deformed than the second guide part, an electrical device is disposed on the opposite side of the power storage element across the second guide part. Also good. Thereby, since the electrical storage element brought close to the 1st control part side can be kept away from electrical devices like a circuit board or a sensor, the heat conduction between an electrical storage element and an electrical device can be suppressed.

  In the power storage device according to the above invention, the first guide part and the second guide part may contact the power storage element in a state of being deformed by substantially the same deformation amount. In this case, the power storage element can be positioned substantially at the center between the first restricting portion and the second restricting portion. In addition, since a space having substantially the same gap width is formed between the first restricting portion and the power storage element and between the second restricting portion and the power storage element, the refrigerant flows between the holder and the power storage element. When it becomes, it becomes easy to cool an electrical storage element effectively.

  In the power storage device according to the above invention, at least one of the first guide part and the second guide part may include a plurality of ribs arranged at intervals. Thereby, in at least one of the 1st guide part and the 2nd guide part, positioning of an electrical storage element is effectively realizable by making a plurality of ribs contact a storage element.

  In the power storage device according to the above invention, at least one of the first guide part and the second guide part may include a long part extending in a predetermined direction. In this case, in at least one of the first guide part and the second guide part, positioning of the power storage element can be effectively realized by bringing the long part into contact with the power storage element.

  In the power storage device according to the above-described invention, the holder may be arranged via the power storage element so that all the first restricting portions are arranged on the same surface and all the second restricting portions are arranged on the same surface. A plurality may be stacked. In this case, the power storage elements can be positioned in the same direction by the plurality of holders aligned so as to be in the same direction.

  In the power storage device according to the above invention, the holder includes a connecting portion that connects the first restricting portion and the second restricting portion, and the connecting portion overlaps the power storage element from one side in a predetermined stacking direction. The amount of protrusion of the second guide portion toward the first restricting portion may increase toward the one side in the stacking direction. In this case, when the power storage element is inserted between the first guide part and the second guide part of the holder, the power storage element can be smoothly guided to the first regulating part side by the second guide part.

The holder according to the present invention is:
A first restricting portion for restricting movement of the power storage element from one side;
A second restricting portion for restricting movement of the power storage element from the other side;
A first guide part protruding from the first restricting part and contacting the power storage element;
And a second guide part that protrudes from the second restricting part and abuts against the power storage element.

  According to the holder of the present invention, when the power storage element and the holder are overlapped, the first restricting portion and the second restricting portion of the holder are deformed while at least one of the first guide portion or the second guide portion of the holder is deformed. A power storage element can be inserted therebetween. Therefore, by inserting the power storage element between the first guide part and the second guide part while restricting relative movement of the holder with respect to the power storage element, at least one of the first guide part or the second guide part is deformed to an appropriate amount. In the state, the storage element is held in the holder. Thereby, an electrical storage element can be positioned exactly with respect to a holder.

An assembling method of the power storage device according to the present invention is as follows.
A method for assembling a power storage device comprising: a holder having a first restricting portion and a second restricting portion; and a power storage element stacked on the holder from one side in a predetermined stacking direction,
The power storage element toward the other side in the stacking direction in a state where the power storage element is in contact with the first guide part protruding from the first restriction part and the second guide part protruding from the second restriction part. The power storage element is inserted between the first restricting portion and the second restricting portion while deforming at least one of the first guide portion or the second guide portion.

  According to the method for assembling the power storage device according to the present invention, when assembling the power storage device by overlapping the power storage element and the holder, the first guide of the holder is deformed while deforming at least one of the first guide portion or the second guide portion of the holder. A power storage element can be inserted between the restricting portion and the second restricting portion. Therefore, by inserting the power storage element between the first guide part and the second guide part while restricting relative movement of the holder with respect to the power storage element, at least one of the first guide part or the second guide part is deformed to an appropriate amount. In the state, the storage element is held in the holder. Thereby, an electrical storage element can be positioned exactly with respect to a holder.

  In the method for assembling the power storage device according to the above invention, while maintaining a state in which a tip of a terminal protruding from the terminal surface of the power storage element is in contact with a predetermined reference surface configured separately from the power storage device The plurality of power storage elements may be stacked via the holder stacked on the power storage element such that the terminal surface comes into contact with the first guide portion. In this case, the positions of the terminals of the plurality of power storage elements can be aligned by a predetermined reference plane. Therefore, for example, connection between terminals by a bus bar can be performed satisfactorily.

  According to the present invention, the power storage element can be superposed on the holder in a state where the power storage element is strictly positioned.

It is a disassembled perspective view which partially decomposes | disassembles and shows the electrical storage apparatus which concerns on 1st Embodiment of this invention. It is a perspective view which shows the spacer of the electrical storage apparatus shown in FIG. It is the perspective view which looked at the spacer shown in FIG. 2 from another direction. It is the perspective view which looked at the spacer shown in FIG. 2 from another direction. It is the sectional view on the AA line of FIG. 1 which shows the electrical storage element and spacer in the assembly | attachment state of an electrical storage apparatus. It is sectional drawing which shows typically an example of the assembly method of an electrical storage apparatus. It is a side view which shows the 1st modification of the 1st guide part of the spacer shown in FIG. It is a side view which shows the 2nd modification of the 1st guide part of the spacer shown in FIG. It is a side view which shows the 3rd modification of the 1st guide part of the spacer shown in FIG. It is a side view which shows the 4th modification of the 1st guide part of the spacer shown in FIG. It is a side view which shows the modification of the 2nd guide part of the spacer shown in FIG. It is sectional drawing similar to FIG. 5 which shows the electrical storage element and spacer in the assembly | attachment state of the electrical storage apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows arrangement | positioning of the heat sink in the electrical storage apparatus shown in FIG. It is a perspective view which shows the spacer of the electrical storage apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing similar to FIG. 5 which shows the electrical storage element and spacer in the assembly | attachment state of the electrical storage apparatus which concerns on 4th Embodiment of this invention. It is a perspective view which shows the spacer of the electrical storage apparatus which concerns on 5th Embodiment of this invention. It is a front view of the spacer shown in FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In order to facilitate understanding of the invention, in the accompanying drawings, some members not related to the present invention are not shown.

[First Embodiment]
As shown in FIG. 1, the power storage device according to the first embodiment of the present invention is an assembled battery 10 in which a plurality (for example, 8) of power storage elements (unit cells) 14 are modularized. Although the use of the assembled battery 10 is not limited, for example, the assembled battery 10 can be used as an auxiliary battery having a relatively low voltage (for example, 12 V) mounted on a gasoline vehicle or a diesel vehicle. In this case, the assembled battery 10 is mounted on an automobile or the like while being housed in an exterior case (not shown).

  The configuration of the assembled battery 10 will be described with reference to FIG. In the following description with reference to FIG. 1, the terms including “upper”, “lower” and “lateral”, and the term “side surface” indicate directions in the posture of the assembled battery 10 shown in FIG. 1. Yes, it does not necessarily coincide with the direction in the actual use state.

  As shown in FIG. 1, each power storage element 14 constituting the assembled battery 10 includes a flat rectangular casing 30 and a lid 32 that closes an upper surface opening of the casing 30. The casing 30 is made of metal, for example. Specific examples of the material of the casing 30 include an aluminum alloy and stainless steel. The surface of the casing 30 may be entirely covered with, for example, a resin exterior film (not shown).

  The lid 32 is an elongated rectangular metal plate. A safety valve 24 is provided on the lid 32. A positive electrode terminal 22 a and a negative electrode terminal 22 b are provided at both ends in the longitudinal direction of the lid 32. The terminals 22 (22a, 22b) are so-called welding terminals having a flat upper surface. A bus bar (not shown) for connecting the plurality of terminals 22 is joined to the upper surface of each terminal 22 by welding, for example. The plurality of terminals 22 connected by the bus bar are preferably arranged so that the heights of the upper surfaces are aligned. Thereby, a bus bar contacts without inclining to the upper surface of each terminal 22, and can be welded favorably.

  However, the terminal 22 may be a so-called screw terminal having a bolt shape. In this case, the bus bar is joined to the bolt-shaped terminal 22 by fastening a nut.

  The power storage element 14 is a secondary battery such as a lithium ion battery, for example, and an electrode body and an electrolytic solution are accommodated in the casing 30 and the lid body 32. However, the storage element 14 may be a secondary battery other than a lithium ion battery.

  The plurality of power storage elements 14 are stacked in the thickness direction (D1 direction in the drawing) of the power storage elements 14 via spacers 16 as holders. As a material of the spacer 16, an insulating material is used. Specifically, for example, a resin is used. The spacers 16 are interposed between the adjacent power storage elements 14 so that the casings 30 of the power storage elements 14 are electrically insulated. In such a stacked state, the terminals 22 (22a, 22b) of the storage element 14 are divided into two rows and arranged in the stacking direction (D1 direction in the drawing). In each row of terminals 22, two positive terminals 22a and two negative terminals 22b are alternately arranged, and the terminals 22 are electrically connected via a plurality of bus bars (not shown).

  On both sides in the stacking direction (D1 direction in the figure), end plates 18a and 18b are provided on the outer sides of the power storage elements 14 stacked on the outermost side, respectively. The end plates 18a and 18b are made of resin, for example. A metal plate 70 is overlaid on the outer surfaces of the end plates 18a and 18b, thereby increasing the rigidity of the end plates 18a and 18b.

  The laminated body 12 including the power storage element 14, the spacer 16, the end plates 18 a and 18 b, and the metal plate 70 laminated in this manner includes a plurality (for example, four) of metal restraining bands 50 (50 a, 50 b, 50 c, 50d) and fixed so as to be sandwiched from both sides in the stacking direction. In addition, the edge part of the restraint band 50 piled up on the outer side of the metal plate 70 is fixed to end plate 18a, 18b with a metal plate 70, for example with a volt | bolt (not shown).

  Hereinafter, a specific configuration of the spacer 16 will be described mainly with reference to FIGS. In the following, the terms including “upper”, “lower”, “right”, “left” and “lateral”, and the term “side” refer to the posture of the spacer 16 shown in FIG. Direction).

  As shown in FIGS. 2 to 4, the spacer 16 includes a main plate portion 40 sandwiched between adjacent power storage elements 14, and a plurality of flange portions 42, 44, 46 a provided at the peripheral edge portion of the main plate portion 40. , 46b, 48a, 48b. However, one flange that is continuous in the circumferential direction of the main plate portion 40 may be formed by integrating a plurality of flange portions.

  The shape of the main plate part 40 is substantially rectangular. A plurality of reinforcing ribs 54 are provided on one surface of the main plate portion 40 appearing in FIGS. 2 and 3. These reinforcing ribs 54 are provided so as to extend in the lateral direction with a space in the vertical direction. By providing the reinforcing ribs 54, the rigidity of the main plate portion 40 is increased. In addition, since a gap is formed between the main plate portion 40 and the power storage element 14, a heat insulating effect is obtained between the power storage elements 14 adjacent to each other with the main plate portion 40 interposed therebetween, and a coolant is caused to flow through the gap. The power storage element 14 can also be cooled.

  The flange portion of the spacer 16 includes an upper surface flange portion 42 as a first flange portion, a lower surface flange portion 44 as a second flange portion, a pair of upper side flange portions 46a and 46b, and a pair of lower side flange portions 48a, 48b is provided. Any of the flange portions 42, 44, 46a, 46b, 48a, 48b are provided along a plane parallel to the stacking direction (D1 direction in the drawing).

  The upper surface flange portion 42 is provided so as to protrude from the upper edge portion of the main plate portion 40 to both sides in the stacking direction (D1 direction in the drawing). The upper surface flange portion 42 is formed so as to extend in a lateral direction (D2 direction in the drawing) perpendicular to the lamination direction (D1 direction in the drawing). A wide portion 42a having an enlarged width in the direction D1 in the drawing is formed. The wide portion 42 a is provided with a pair of notches 43 for exposing the safety valve 24 of the power storage element 14.

  The lower surface flange portion 44 is provided so as to protrude from the lower edge portion of the main plate portion 40 to both sides in the stacking direction (D1 direction in the drawing). The lower surface flange portion 44 is disposed to face the upper surface flange portion 42. That is, the upper surface flange portion 42 and the lower surface flange portion 44 connect the power storage element 14 from both sides in the vertical direction (D3 direction in the drawing) perpendicular to the stacking direction (D1 direction in the drawing) and the horizontal direction (D2 direction in the drawing). It is arranged so as to be sandwiched.

  On the lower surface of the lower surface flange portion 44, a pair of left and right projecting portions 45a and 45b are provided at both ends in the lateral direction (D2 direction in the drawing). Between the pair of protrusions 45a and 45b, concave grooves 51c and 51d into which the restraining bands 50c and 50d are fitted are formed. On the lower surface of the lower surface flange portion 44, a protruding portion 45c is also provided at the central portion in the lateral direction (D2 direction in the drawing). With respect to the stacking direction (D1 direction in the drawing), an engaging convex portion 56 is provided on one end face of the protruding portion 45c, and an engaging concave portion 57 (see FIG. 4) is provided on the other end face. In a state where the assembled battery 10 is assembled, the engaging convex portion 56 of one spacer 16 adjacent to the stacking direction (D1 direction in the drawing) and the engaging concave portion 57 of the other spacer 16 are engaged. Yes.

  The upper side flange portions 46 a and 46 b are provided in a portion above the center portion in the vertical direction at the left and right side edge portions of the main plate portion 40. One upper side flange portion 46a is provided so as to protrude from one side edge (right edge) in the lateral direction (D2 direction in the figure) of the main plate part 40 to both sides in the stacking direction (D1 direction in the figure). The other upper side flange portion 46b is provided so as to protrude from the other side edge portion (left side edge portion) of the main plate portion 40 to both sides in the stacking direction (D1 direction in the drawing). These upper side flange portions 46a and 46b are arranged so as to sandwich the power storage element 14 from both sides in the lateral direction (D2 direction in the figure).

  A pair of upper and lower protrusions 47a and 47b are provided on the outer surface of each upper side flange portion 46a and 46b. Between the pair of projecting portions 47a and 47b, concave grooves 51a and 51b into which the restraining bands 50a and 50b are fitted are formed. A roof portion 52 connected to the upper surface flange portion 42 is provided on the upper edge portion of each upper side flange portion 46a, 46b.

  The lower side flange portions 48a and 48b are provided in a portion below the central portion in the vertical direction at the left and right side edge portions of the main plate portion 40. One lower side flange 48a is provided so as to protrude from one side edge (right edge) in the lateral direction (D2 direction in the figure) of the main plate part 40 to both sides in the stacking direction (D1 direction in the figure). The other lower side flange portion 48b is provided so as to protrude from the other side edge portion (left side edge portion) of the main plate portion 40 to both sides in the stacking direction (D1 direction in the drawing). These lower side flange portions 48a and 48b are arranged so as to sandwich the power storage element 14 from both sides in the lateral direction (D2 direction in the figure).

  Protruding portions 49 are provided on the outer surfaces of the lower side flange portions 48a and 48b. With respect to the stacking direction (D1 direction in the drawing), an engaging convex portion 58 is provided on one end surface of the protruding portion 49, and an engaging concave portion 59 (see FIG. 4) is provided on the other end surface. In a state where the assembled battery 10 is assembled, the engaging convex portion 58 of one spacer 16 and the engaging concave portion 59 of the other spacer 16 which are adjacent to each other in the stacking direction (D1 direction in the drawing) are engaged. Yes. The spacers 16 are positioned relative to each other by the engagement between the engaging convex portions 56 and 58 and the engaging concave portions 57 and 59.

  As shown in FIG. 5, each power storage element 14 is positioned by a pair of spacers 16 that sandwich the power storage element 14. In the storage element 14, the terminal surface 71 on which the terminal 22 protrudes is disposed to face the lower surface (first regulating portion) of the upper surface flange portion 42 of the spacer 16, and the bottom surface 72 opposite to the terminal surface 71 is the spacer 16. It is positioned so as to face the upper surface (second restricting portion) of the lower surface flange portion 44. A gap is formed between the one surface 73 in the stacking direction (D1 direction in the figure) of the power storage element 14 and the main plate portion 40 of the spacer 16 facing the surface 73 by interposing the reinforcing ribs 54. Thereby, the heat insulation effect between the adjacent electrical storage elements 14 is acquired.

  The spacer 16 includes a first guide portion 61 (61 a, 61 b) that contacts the terminal surface 71 of the energy storage element 14 and a second guide portion 62 (62 a, 62 b) that contacts the bottom surface 72 of the energy storage element 14.

  As shown in FIG. 3, the first guide portion 61 (61 a, 61 b) includes a rib 63 that protrudes from the lower surface of the upper surface flange portion 42. FIG. 3 shows only the first guide portion 61a provided on one side of the main plate portion 40, but the first guide portions 61a and 61b are on both sides of the main plate portion 40. Provided (see FIG. 5). In the present embodiment, the configuration of one first guide portion 61a is the same as the configuration of the other first guide portion 61b, but the configurations of both may be different.

  A plurality of ribs 63 are provided at intervals in the lateral direction (D2 direction in the figure). For example, two ribs 63 are provided, but the number of ribs 63 may be one or three or more.

  Each rib 63 is disposed along a plane perpendicular to the main plate portion 40. The rib 63 is formed across the upper surface flange portion 42 and the main plate portion 40. The rib 63 has an inclined surface 64 that is inclined downward toward the main plate portion 40 in the stacking direction (D1 direction in the drawing). The rib 63 has, for example, a triangular shape when viewed from the lateral direction (D2 direction in the drawing). The amount of protrusion of the rib 63 downward increases as it approaches the main plate portion 40 in the stacking direction (D1 direction in the drawing). However, the shape of the rib 63 is not particularly limited, and can be changed to various shapes including modifications described later. Further, all the ribs 63 constituting the first guide portion 61 may have the same shape, or each rib 63 may have a different shape.

  As shown in FIGS. 2 and 4, the second guide portion 62 (62 a, 62 b) includes a rib 66 protruding from the upper surface of the lower surface flange portion 44. 2 shows a second guide part 62a provided on one side of the main plate part 40, and FIG. 4 shows a second guide part 62b provided on the other side. ing. In the present embodiment, the configuration of one second guide portion 62a is the same as the configuration of the other second guide portion 62b, but the configurations of both may be different.

  A plurality of ribs 66 are provided at intervals in the lateral direction (D2 direction in the figure). The plurality of ribs 66 can support the power storage element 14 without tilting from the lower side. For example, three ribs 66 are provided, but the number of ribs 66 may be two or four or more. Further, the number of the ribs 66 may be one as long as the shape of the ribs 66 can stably support the power storage element 14.

  Each rib 66 is disposed along a plane perpendicular to the main plate portion 40. The rib 66 is formed across the lower surface flange portion 44 and the main plate portion 40. The rib 66 has an inclined surface 67 inclined upward toward the main plate portion 40 in the stacking direction (D1 direction in the drawing). The rib 66 has, for example, a triangular shape when viewed from the lateral direction (D2 direction in the drawing). The amount of overhang of the rib 66 increases as it approaches the main plate portion 40 in the stacking direction (D1 direction in the drawing). However, the shape of the rib 66 is not particularly limited, and various changes can be made. Moreover, all the ribs 66 which comprise the 2nd guide part 62 may have the same shape, and a shape may differ for every rib 66. FIG.

  As shown in FIG. 5, the ribs 63 and 66 of the first guide portion 61 and the second guide portion 62 are deformed by the rib 63 of the first guide portion 61 compared to the deformed amount of the rib 66 of the second guide portion 62. Is in contact with the electric storage element 14 so as to increase. The rib 66 of the second guide portion 62 may not be deformed or may be slightly deformed. When the deformation amount of the first guide portion 61 is larger than the deformation amount of the second guide portion 62, the power storage element 14 is positioned in a state of being brought closer to the upper surface flange portion 42 side.

  In order to realize such a positioning state, the rib 63 of the first guide portion 61 is provided so as to be more easily deformed than the rib 66 of the second guide portion 62. Specifically, the rigidity of the rib 66 is higher than the rigidity of the rib 63 so that the rib 63 is more easily elastically deformed than the rib 66. The rib 63 may be plastically deformed through elastic deformation. When the rib 63 is plastically deformed, it is preferable that the strength of the rib 66 is higher than the strength of the rib 63.

  In this embodiment, the thickness of the rib 66 is larger than the thickness of the rib 63 in the lateral direction (D2 direction in FIGS. 2 to 4) so that the rigidity of the rib 66 is higher than the rigidity of the rib 63. Yes. However, the configuration for changing the ease of deformation of the ribs 63 and 66 is not particularly limited. For example, the ribs 63 and 66 may be easily deformed (at least one of rigidity and strength) by changing at least one of the shape, material, and number of the ribs 63 and 66.

  The bottom surface 72 of the electricity storage element 14 contacts the inclined surface 67 of the rib 66 of the second guide portion 62 at the corner portions on both sides in the stacking direction (D1 direction in the drawing). The inclined surface 67 is inclined so that the amount of protrusion to the upper surface flange portion 42 side in the vertical direction (D3 direction in the drawing) increases as it approaches the main plate portion 40. Therefore, the first guide portion 61 and the second guide The power storage element 14 inserted between the second portion 62 and the second guide portion 62 is smoothly guided to the upper surface flange portion 42 side in the vertical direction (D3 direction in the drawing) by the inclined surface 67 of the second guide portion 62. The electricity storage element 14 guided upward by the second guide part 62 crushes the rib 63 of the first guide part 61. Thereby, the electrical storage element 14 is positioned such that the gap between the bottom surface 72 and the lower surface flange portion 44 of the spacer 16 is larger than the gap between the terminal surface 71 and the upper surface flange portion 42 of the spacer 16. The

  Since the first guide portion 61 and the second guide portion 62 are configured by the ribs 63 and 66, the upper surface flange is formed in a portion where the ribs 63 and 66 are not disposed in the lateral direction (D2 direction in FIGS. 2 to 4). A gap is formed between the portion 42 and the lower surface flange portion 44 and the power storage element 14. In particular, a relatively large gap is formed between the lower surface flange portion 44 and the bottom surface 72 of the energy storage device 14. By forming an air flow in these gaps, the power storage element 14 can be effectively cooled.

  As schematically shown in FIG. 6, the power storage device 1 is assembled with the terminal 22 of the power storage element 14 facing downward. At the time of assembly, the storage element 14 is arranged so that the surface of the terminal 22 abuts on a predetermined reference surface 100 provided in the work space for assembly, and the spacer 16 has the upper surface flange portion 42 on the reference surface 100. It arrange | positions with the attitude | position facing. The storage elements 14 and the spacers 16 arranged in this manner are alternately stacked while maintaining the state where the terminals 22 are in contact with the reference surface 100. Thereby, the plurality of power storage elements 14 are stacked via the spacers 16. Note that end plates 18a and 18b are stacked from the outside on the electricity storage element 14 arranged on the outermost side in the stacking direction (D1 direction in the drawing).

  As described above, the adjacent spacers 16 are positioned with respect to each other by the engagement of the engaging convex portions 56 and 58 and the engaging concave portions 57 and 59 (see FIGS. 2 to 4). Adjacent spacers 16 are engaged with each other while being arranged in the same direction. Therefore, all the spacers 16 are overlapped in the same direction. Therefore, in the assembled state, the upper surface flange portions 42 of all the spacers 16 are arranged on the same surface, and the lower surface flange portions 44 of all the spacers 16 are arranged on the same surface.

  Each power storage element 14 is positioned by being sandwiched by the pair of spacers 16 from both sides in the stacking direction (D1 direction in the figure). In a state where the ribs 63 and 66 of the first guide portion 61 and the second guide portion 62 are not deformed, the interval between the ribs 63 and 66 is smaller than the height of the power storage element 14 in the vertical direction (D3 direction in the drawing). . Therefore, when the power storage element 14 is sandwiched between the spacer 16 assembled first and the spacer 16 assembled next, the power storage element 14 is in contact with both ribs 63 and 66 of the spacer 16 assembled first. The spacer 16 is pushed toward the main plate portion 40. As a result, at least the rib 63 of the first guide portion 61 is elastically deformed so that the interval between the ribs 63 and 66 is widened, whereby the power storage element 14 is inserted between the ribs 63 and 66 (see FIG. 5). ).

  At this time, the rib 66 of the second guide portion 62 may not be deformed, or may be deformed with a smaller deformation amount than the rib 63 of the first guide portion 61. The ribs 63 and 66 may be deformed only by elastic deformation, or may be plastically deformed through elastic deformation.

  According to the present embodiment, the power storage element 14 can be inserted between the first guide portion 61 and the second guide portion 62 of the spacer 16 without a gap. Therefore, shakiness of the electricity storage element 14 in the vertical direction (D3 direction in the figure) can be prevented. Further, as shown in FIG. 6, since the assembly is performed in a state where the positions of the terminals 22 of the plurality of power storage elements 14 are aligned by the reference surface 100, the terminal surface 71 in the vertical direction (D3 direction in the figure) due to product tolerance. Even if there is a variation in the distance H1 (see FIG. 5) between the terminal 22 and the surface of the terminal 22, the amount of deformation of the first guide portion 61 is appropriately adjusted, so that the terminal from the upper surface flange portion 42 in all the spacers 16. The protrusion amount H2 of 22 (see FIG. 5) becomes uniform. In this way, the power storage element 14 is accurately positioned so that the position of the terminal 22 in the vertical direction (D3 direction in the figure) is constant. Therefore, when connecting between the terminals 22 with a bus bar (not shown), the inclination of the bus bar can be prevented, whereby the bus bar and the terminal 22 can be favorably welded.

  A modification of the first guide portion 61 (61a, 61b) will be described with reference to FIGS.

  In the first modification shown in FIG. 7, the rib 80 of the first guide portion 61 has the same shape as the above-described rib 63 (see FIG. 3). The rib 80 includes a first rib portion 81 and a second rib portion 82 that are different in ease of deformation. The first rib portion 81 is provided so as to be more easily deformed than the second rib portion 82. The configuration for making the first rib portion 81 easier to deform than the second rib portion 82 is not limited. For example, the thickness of the first rib portion 81 is made smaller than the thickness of the second rib portion 82. Thus, the rigidity of the first rib part 81 is lower than the rigidity of the second rib part 82, and the first rib part 81 is more easily elastically deformed than the second rib part 82. Further, for example, the first rib portion 81 is made different from the material of the first rib portion 81 and the second rib portion 82 so that the strength of the first rib portion 81 is lower than the strength of the second rib portion 82. It becomes easier to plastically deform than the second rib portion 82.

  The second rib portion 82 is an upper portion of the rib 80 disposed along the lower surface of the upper surface flange portion 42, and the first rib portion 81 is opposite to the upper surface flange portion 42 with the second rib portion 82 interposed therebetween. It is the lower part of the rib 80 arrange | positioned in this. When the storage element 14 is positioned with respect to the spacer 16, the storage element 14 contacts the first rib portion 81. Since the first rib portion 81 is easier to deform than the second rib portion 82, smooth deformation of the first rib portion 81 in contact with the power storage element 14 can be realized.

  In the second modification shown in FIG. 8, the rib 83 of the first guide portion 61 has the same shape as the rib 80 according to the first modification, and like the rib 80, the first rib is different in ease of deformation. A portion 81 and a second rib portion 82 are provided. In the second modification, the first rib portion 81 is disposed along the main plate portion 40, and the second rib portion 82 is disposed on the opposite side of the main plate portion 40 with the first rib portion 81 interposed therebetween. . Also in the second modified example, as in the first modified example, when the power storage element 14 is positioned with respect to the spacer 16, the power storage element 14 contacts the first rib portion 81. Since the first rib portion 81 is easier to deform than the second rib portion 82, smooth deformation of the first rib portion 81 in contact with the power storage element 14 can be realized.

  In the rib 84 of the first guide portion 61 according to the third modification shown in FIG. 9, the contact surface 85 with the power storage element 14 is a curved surface so as to swell downward. The rib 84 having such a shape can be deformed by an appropriate amount by being pushed toward the upper surface flange portion 42 by the power storage element 14, similarly to the rib 63 (see FIG. 3) described above.

  It should be noted that the ribs 84 according to the third modification also have a first rib portion 81 and a second rib portion 82 that are different in ease of deformation, like the first modification shown in FIG. 7 or the second modification shown in FIG. May be provided.

  The rib 86 of the 1st guide part 61 which concerns on a 4th modification shown in FIG. 10 has the contact surface 85 curved so that it may bulge below similarly to the rib 84 of a 3rd modification. A gap 88 is provided between the rib 86 of the fourth modified example and the main plate portion 40. Thereby, the rib 86 is easily deformed in the vertical direction (D3 direction in the figure) without being constrained by the main plate portion 40.

  It should be noted that the ribs 86 according to the fourth modification also have the first rib portion 81 and the second rib portion 82 that are different in ease of deformation, like the first modification shown in FIG. 7 or the second modification shown in FIG. May be provided.

  The rib of the first guide portion 61 is not limited to the configuration of the rib 63 shown in FIG. 3 and the ribs 80, 83, 84, 86 of the modified examples shown in FIGS. The configuration can be changed.

  Further, the rib of the second guide portion 62 is not limited to the configuration of the rib 66 (see FIGS. 2 and 4) described above, and is the same as the rib of the first guide portion 61 shown in FIGS. Or other various configurations.

  Furthermore, the first guide portion 61 and the second guide portion 62 do not necessarily have to be configured with ribs as long as they protrude from the lower surface of the upper surface flange portion 42 or the upper surface of the lower surface flange portion 44.

  A modification of the second guide portion 62 (62a, 62b) will be described with reference to FIG.

  The 2nd guide part 62 which concerns on the modification shown in FIG. 11 is provided with the elongate part 90 extended in a horizontal direction (D2 direction in a figure). The long portion 90 is provided across the upper surface of the lower surface flange portion 44 and the main plate portion 40. The long portion 90 is, for example, a solid portion of a cross-sectional triangle having an inclined surface 91 inclined upward toward the main plate portion 40 in the stacking direction (D1 direction in the drawing). The long portion 90 is provided over the entire length of the upper surface flange portion 42, for example. Thereby, the shape of the metal mold | die for shape | molding the spacer 16 is simplified, and manufacturing cost can be reduced.

  However, the long portion 90 may be provided in a part in the length direction of the upper surface flange portion 42. Further, the long portion 90 may be divided into a plurality of portions in the length direction. Further, the long portion 90 may be provided so as to form a gap with the main plate portion 40. In this case, the long portion 90 can be deformed without being constrained by the main plate portion 40.

  By configuring the second guide portion 62 with the long portion 90, the contact area with the power storage element 14 can be increased as compared with the case where the second guide portion 62 is configured with a rib. Therefore, the power storage element 14 can be stably supported from the lower side by the second guide portion 62.

  Although the long portion 90 shown in FIG. 11 is provided integrally with the spacer 16, a separate long portion may be attached to the spacer. Thereby, the 2nd guide part 62 can be easily formed in the existing spacer.

  In addition, the 1st guide part 61 may be comprised by a long part instead of a rib similarly to the 2nd guide part 62. FIG.

[Second Embodiment]
A power storage device according to a second embodiment of the present invention will be described with reference to FIGS. 12 and 13. In the second embodiment, detailed description of the configuration common to the first embodiment is omitted. In FIGS. 12 and 13, the same reference numerals are given to components having the same functions as those in the first embodiment.

  As shown in FIGS. 12 and 13, in the power storage device according to the second embodiment, the power storage element 14 is located below the stacked body 12, that is, on the side opposite to the power storage element 14 with the lower surface flange portion 44 of the spacer 216 interposed therebetween. A heat sink 202 for cooling the battery is disposed. The power storage element 14 and the heat sink 202 are thermally coupled via a heat conductive member (not shown). Specifically, for example, a hole or notch (not shown) is provided in the lower surface flange portion 44 of the spacer 16, and the power storage element is passed through a heat conduction member that passes through the lower surface flange portion 44 through the hole or notch. 14 and the heat sink 202 are thermally coupled. As the heat conductive member, it is preferable to use an insulating material having high heat conductivity.

  As shown in FIG. 12, the spacer 216 includes a first guide portion 61 (61a, 61b) and a second guide portion 62 (62a, 62b) similar to those in the first embodiment. However, unlike the first embodiment, the first guide portion 61 (61a, 61b) is provided on the upper surface of the lower surface flange portion 44, and the second guide portion 62 (62a, 62b) is provided on the lower surface of the upper surface flange portion 42. ing. Since the rib 63 of the first guide portion 61 is provided so as to be more easily deformed than the rib 66 of the second guide portion 62, the power storage element 14 is located on the lower surface flange portion 44 side in the vertical direction (D3 direction in the figure). Positioned together.

  According to the second embodiment, the electrical storage element 14 is positioned close to the lower surface flange portion 44 side, so that an increase in the distance from the heat sink 202 is suppressed. Depending on the structure of the spacer 16 and the heat sink 202, the storage element 14 and the heat sink 202 can be brought into direct contact with each other. Therefore, the power storage element 14 can be effectively cooled by the heat sink 202. Moreover, since the protrusion amount H3 of the terminal 22 from the upper surface flange portion 42 can be suppressed as compared with the first embodiment, the volume of the entire power storage device can be reduced.

  In the second embodiment, a temperature adjustment member other than the heat sink 202 may be disposed below the power storage element 14, and in this case as well, the power storage element 14 is effectively cooled or heated by the temperature adjustment member. be able to.

[Third Embodiment]
A power storage device according to a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, detailed description of the configuration common to the first embodiment is omitted. Moreover, in FIG. 14, the same code | symbol is attached | subjected to the component which has the function similar to 1st Embodiment.

  As shown in FIG. 14, the spacer 316 of the power storage device according to the third embodiment has a symmetrical shape in the vertical direction (D3 direction in the drawing). Specifically, the spacer 316 includes a main plate portion 40 similar to that of the first embodiment, a pair of side flange portions 346 and 348 having a vertically symmetrical shape provided on the side edge portion of the main plate portion 40, An upper surface flange portion 42 similar to that of the first embodiment provided at the upper edge portion of the plate portion 40 and a lower surface flange portion 344 having the same shape as the upper surface flange portion 42 provided at the lower edge portion of the main plate portion 40 are provided. Prepare.

  Similar to the upper surface flange portion 42, the lower surface flange portion 344 is provided with a wide portion 345 and a notch portion 346. On the upper surface of the wide portion 345, second guide portions 62 (62a, 62b) similar to those in the first embodiment are provided. Although not shown in FIG. 14, first guide portions 61 (61 a and 61 b) similar to those in the first embodiment are provided on the lower surface of the wide portion 42 a of the upper surface flange portion 42. Similar to the first embodiment, the first guide portion 61 is more easily deformed than the second guide portion 62, and therefore can be positioned in a state in which the power storage element 14 is brought closer to the upper surface flange portion 42 side by the spacer 316.

  Since the spacer 316 has a vertically symmetric shape, the spacer 316 can also be used in a posture inverted from the posture shown in FIG. In this case, since the first guide part 61 is disposed on the lower side of the power storage element 14 and the second guide part 62 is disposed on the upper side of the power storage element 14, the power storage element 14 is positioned in a state of being brought to the lower side. The Therefore, when a temperature adjustment member such as the heat sink 202 (see FIGS. 12 and 13) of the second embodiment is disposed below the energy storage element 14, the energy storage element 14 disposed relatively close to the temperature adjustment member. Can be effectively cooled or heated.

  The spacer 316 according to the third embodiment changes the assembly posture as appropriate, so that the storage element 14 is moved upward as in the first embodiment and the storage element 14 as in the second embodiment. It can be used corresponding to any of the cases where it is moved downward.

[Fourth Embodiment]
A power storage device according to a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, detailed description of the configuration common to the first embodiment is omitted. In FIG. 15, the same reference numerals are given to components having the same functions as those in the first embodiment.

  As shown in FIG. 15, the spacer 416 of the power storage device according to the fourth embodiment includes a first guide portion 61 and a second guide portion 62 as in the first embodiment. However, unlike the first embodiment, the ribs 63 of the first guide portion 61 and the ribs 66 of the second guide portion 62 are provided so as to be equally deformable. Therefore, when the power storage element 14 is positioned by the spacer 416, the ribs 63 and 66 abut on the power storage element 14 in a state of being deformed by substantially the same deformation amount. Thereby, the electrical storage element 14 is positioned at the approximate center between the upper surface flange portion 42 and the lower surface flange portion 44 in the vertical direction (D3 direction in the drawing).

  Since the temperature of the storage element 14 tends to be particularly high at the center in the vertical direction (D3 direction in the figure), in order to effectively cool the storage element 14 sandwiched between the pair of spacers, cooling from both the upper and lower sides is required. Preferably it is done. According to the spacer 416 according to the fourth embodiment, substantially the same height is provided between the upper surface flange portion 42 and the terminal surface 71 of the electricity storage device 14 and between the lower surface flange portion 44 and the bottom surface 72 of the electricity storage device 14. Therefore, the storage element 14 can be effectively cooled by the airflow passing through the spaces S1 and S2 on both sides.

  Further, when the refrigerant flows in the gap between the electric storage element 14 and the spacer 16, the center of the refrigerant flow path is in the vertical direction (D3 direction in the figure) with the upper surface flange portion 42 and the lower surface flange portion 44 of the spacer 16. The refrigerant is most likely to flow at this height position. According to the fourth embodiment, with respect to the vertical direction (D3 direction in the drawing), the central portion of the electricity storage element 14 that is likely to reach the highest temperature is at an intermediate position between the upper surface flange portion 42 and the lower surface flange portion 44 where the refrigerant flows most easily. Positioned. Therefore, it is possible to effectively cool all the power storage elements 14 constituting the assembled battery 10.

[Fifth Embodiment]
A power storage device according to a fifth embodiment of the present invention will be described with reference to FIGS. 16 and 17. In the fifth embodiment, detailed description of configurations common to the first embodiment is omitted. In FIGS. 16 and 17, the same reference numerals are given to components having the same functions as those in the first embodiment.

  As shown in FIGS. 16 and 17, in the spacer 516 of the power storage device according to the fifth embodiment, unlike the first embodiment, the second guide portion 62 is provided on one of the upper side flange portion 46 a and the lower side flange portion 48 a. The first guide portion 61 is provided on the other upper side flange portion 46b and the lower side flange portion 48b.

  As shown in FIG. 17, for example, one rib 63 of the first guide portion 61 is provided for each of the upper side flange portion 46b and the lower side flange portion 48b, but the number of ribs 63 is particularly limited. Not. For example, one rib 66 of the second guide portion 62 is provided for each of the upper side flange portion 46a and the lower side flange portion 48a, but the number of ribs 66 is not particularly limited.

  Similar to the first embodiment, the rib 63 of the first guide portion 61 is provided so as to be more easily deformed than the rib 66 of the second guide portion 62. Therefore, when the power storage element 14 is positioned by the spacer 516, the deformation amount of the rib 63 of the first guide portion 61 is larger than the deformation amount of the rib 66 of the second guide portion 62. Therefore, the power storage element 14 is arranged close to the flange portions 46b and 48b provided with the first guide portion 61 in the lateral direction (D2 direction in the drawing). As a result, the space S3 is formed by interposing the rib 66 that is not deformed or has a smaller deformation amount than the rib 63 between the one upper side flange portion 46a and the lower side flange portion 48a and the side surface 74 of the electricity storage element 14. Is formed.

  In the fifth embodiment, the circuit board 502 is disposed adjacent to the power storage element 14 on the opposite side of the one upper side flange portion 46a and the lower side flange portion 48a. As described above, the power storage element 14 is arranged offset in the horizontal direction (D2 direction in the figure) so as to be away from the circuit board 502, and thereby the space S3 is formed, so that the space S3 performs a heat insulating function. Thus, heat conduction between the power storage element 14 and the circuit board 502 can be suppressed. Moreover, the circuit board 502 and the electrical storage element 14 are spaced apart from each other through the space S3, so that the occurrence of a liquid junction between them is suppressed.

  In the fifth embodiment, in addition to the upper side flange portion 46b and the lower side flange portion 48b, the first guide portion 61 is provided on one of the upper surface flange portion 42 and the lower surface flange portion 44, and the upper side flange portion 46a. In addition to the lower side flange portion 48a, the second guide portion 62 may be provided on the other of the upper surface flange portion 42 or the lower surface flange portion 44. Thereby, the electrical storage element 14 can be positioned not only in the horizontal direction (D2 direction in the figure) but also in the vertical direction (D3 direction in the figure).

  In the fifth embodiment, electrical devices other than the circuit board 502 such as various sensors may be disposed on the side of the power storage element 14, and in this case also, between the power storage element 14 and the electrical device. The occurrence of heat conduction and liquid junction can be suppressed.

  Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments.

  For example, in the above-described embodiment, the case where the first guide portion 61 and the second guide portion 62 are configured by ribs or long portions has been described. However, in the present invention, the first guide portion is a projection portion other than the ribs and long portions. You may comprise a guide part or a 2nd guide part. For example, you may comprise a 1st guide part or a 2nd guide part by the one large projection part which protrudes from the whole surface or most part of a flange part, or the some projection part scattered in the flange part.

  Further, in the above embodiment, the flange portion of the spacer is arranged in parallel to the stacking direction (D1 direction in the drawing), and the main plate portion of the spacer is arranged in parallel to the lateral direction (D2 direction in the drawing) perpendicular to the stacking direction. In the present invention, the flange portion is disposed to be inclined with respect to the stacking direction (D1 direction in the drawing), or the main plate portion is inclined to the lateral direction (D2 direction in the drawing). May be arranged.

  Furthermore, although the above embodiment demonstrated the case where the spacer which has a main plate part was used, in this invention, the holder like a spacer does not necessarily need to be provided with a main plate part. In addition, the holder in which the main plate part is not provided is provided with some connection part connected to the flange part. As a specific example of the connecting portion other than the main plate portion, there is a columnar connecting portion that connects between a pair of flange portions.

  Moreover, although the above embodiment demonstrated the case where the 1st control part and 2nd control part of a holder which control a movement of an electrical storage element were comprised by the flange part of a holder, in this invention, a 1st control part and A 2nd control part may be comprised in parts other than the flange part in a holder.

  Furthermore, the present invention is not limited to an assembled battery in which a plurality of power storage elements are stacked, and can also be applied to a power storage device including only one power storage element.

10 battery pack (power storage device)
12 Laminated body 14 Power storage element 16 Spacer (holder)
18a, 18b End plate 22a Positive electrode terminal of electricity storage element 22b Negative electrode terminal of electricity storage element 40 Main plate part 42 Upper surface flange part 44 Lower surface flange part 46a, 46b Upper side flange part 48a, 48b Lower side flange part 50 Restraint band 61a, 61 1st 1 guide part 62a, 62b 2nd guide part 63,80,83,84,86 1st guide part rib 66 2nd guide part rib 70 metal plate 90 elongate part 202 heat sink 502 circuit board

Claims (15)

A power storage device including a power storage element and a holder,
The power storage element includes a square casing,
The holder is
A first facing portion facing the power storage element from one side;
A second facing portion facing the power storage element from the other side;
A first guide portion that protrudes from the first facing portion and contacts the power storage element;
A second guide part that protrudes from the second facing part and abuts against the power storage element,
The power storage device, wherein the first guide part is more easily deformed than the second guide part. A power storage device including a power storage element and a holder,
The power storage element includes a square casing,
The holder is
A first facing portion facing the power storage element from one side;
A second facing portion facing the power storage element from the other side;
A first guide portion that protrudes from the first facing portion and contacts the power storage element;
A second guide part that protrudes from the second facing part and abuts against the power storage element,
The power storage device, wherein the power storage element is arranged close to the first facing portion between the first facing portion and the second facing portion. The power storage element includes a terminal surface from which a terminal protrudes,
The power storage device according to claim 1, wherein the terminal surface is disposed to face the first facing portion.   The power storage device according to claim 1, wherein a temperature adjustment member is disposed on a side opposite to the power storage element with the first facing portion interposed therebetween.   3. The power storage device according to claim 1, wherein an electric device is disposed on a side opposite to the power storage element with the second guide portion interposed therebetween.   A plurality of the holders are stacked via the power storage element such that all the first facing portions are disposed on the same surface and all the second facing portions are disposed on the same surface. The power storage device according to any one of claims 1 to 5. The holder further has a main plate portion overlaid on the electricity storage element in a predetermined stacking direction,
The first guide part has an inclined surface that is inclined toward the second facing part as it approaches the main plate part in the stacking direction,
The said 2nd guide part has an inclined surface which inclined to the said 1st opposing part side as it approaches the said main plate part in the said lamination direction, The any one of Claims 1-6 characterized by the above-mentioned. The power storage device described.   The power storage device according to claim 7, wherein an inclination angle of the inclined surface of the first guide portion is smaller than an inclination angle of the inclined surface of the second guide portion. The first guide part and the second guide part are ribs,
9. The power storage device according to claim 1, wherein the number of ribs of the first guide portion is smaller than the number of ribs of the second guide portion. The first guide part and the second guide part are ribs,
10. The power storage device according to claim 1, wherein a thickness of the rib of the second guide portion is greater than a thickness of the rib of the first guide portion. At least the first guide part of the first guide part and the second guide part is in contact with the power storage element in a deformed state,
11. The power storage device according to claim 1, wherein a deformation amount of the first guide portion is larger than a deformation amount of the second guide portion.   12. The power storage device according to claim 1, wherein rigidity of the second guide part is higher than rigidity of the first guide part.   13. The power storage device according to claim 1, wherein the strength of the second guide portion is higher than the strength of the first guide portion. From one side , a first facing portion facing a power storage element including a square casing ;
A second facing portion facing the power storage element from the other side;
A first guide portion that protrudes from the first facing portion and contacts the power storage element;
A second guide part that protrudes from the second facing part and abuts against the power storage element,
The holder characterized in that the first guide part is more easily deformed than the second guide part. A method of assembling a power storage device comprising: a holder having a first facing portion and a second facing portion; and a power storage element stacked on the holder from one side in a predetermined stacking direction,
The power storage element includes a square casing,
When stacking the electricity storage element on the holder, the first guide part protruding from the first opposing part is brought into contact with the terminal surface of the electricity storage element, and the second guide part protruding from the second opposing part is provided. By pressing the power storage element toward the other side in the stacking direction in a state where the power storage element is in contact with the surface opposite to the terminal surface, at least the first guide part or the second guide part Inserting the electricity storage element between the first facing portion and the second facing portion while deforming one,
While maintaining a state in which a tip of a terminal protruding from the terminal surface is in contact with a predetermined reference surface configured separately from the power storage device, a plurality of A method of assembling a power storage device comprising stacking the power storage elements.

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