JP2016031902A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle power storage device of which the vibration resistance is improved.SOLUTION: A power storage device includes: power storage elements which are angular power storage elements and aligned in a first direction; and an internal spacer 2A which is disposed between the power storage elements. The internal spacer 2A includes: a base 20A with which the power storage elements are disposed at both sides in the first direction; and a regulation part 21A which is abutted with one end of the power storage elements in a second direction orthogonal with the first direction and suppresses the positional displacement of the power storage elements relative to the base 20A. The regulation part at one end side includes: a first confronting portion 2111 including a confronting surface 2111A that confronts one end face of the power storage element; a pair of second confronting portions 2112 holding one end of the power storage element therebetween in a third direction orthogonal with the first and second directions; and a projection 2114 which protrudes from the confronting surface to the one end face of the power storage element and extends in the third direction.SELECTED DRAWING: Figure 6

Description

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

  Conventionally, a battery module for a vehicle including a square battery cell is known (see Patent Document 1). Specifically, the battery module includes a plurality of battery cells aligned in a predetermined direction (first direction), and a holder disposed between the aligned battery cells.

  The holder includes a main body that extends in a direction orthogonal to the first direction, and an engaging portion that protrudes from the main body to both sides in the first direction and engages with a lower end of the battery cell adjacent to the main body. And have.

  The engaging portion includes a pair of fourth engaging portions extending from the main body along the lower end of each side surface of the battery cell on both sides of the main body in the first direction, and a width of the bottom surface of the battery cell. A pair of load transmitting portions extending from the main body at both ends in the direction. The corresponding fourth engaging portion and the load transmitting portion corresponding to each corner portion at the lower end of the battery cell are in contact with the bottom surface side and the side surface side of the corner portion. Thereby, since each holder engages with the lower end portion of the battery cell adjacent to the holder, a predetermined rigidity is obtained in the battery module, and as a result, a battery module having high vibration resistance is obtained.

  Since the battery module is mounted on a vehicle or the like, it is used in a situation where vibrations are easily applied. For this reason, in recent years, further improvement of vibration resistance in battery modules has been desired.

JP 2012-256465 A

  Thus, an object of the present invention is to provide a power storage device that can improve vibration resistance.

The electricity storage device according to the present invention is:
A storage element which is a square storage element and is aligned in the first direction;
An internal spacer disposed between the power storage elements,
The inner spacer is a base extending in a direction orthogonal to the first direction, the base in which the power storage element is disposed on both sides of the first direction, and the second direction orthogonal to the first direction. A restricting portion that is in contact with one end face of the electricity storage element and suppresses the positional deviation of the electricity storage element with respect to the base, and has one end side restriction portion that extends from the base to both sides in the first direction, and
The one end side restricting portion is
A first facing portion having a facing surface facing the one end surface of the power storage element;
A pair of second opposing portions sandwiching an end portion including the one end face of the power storage element in a third direction orthogonal to the first direction and the second direction;
A protrusion that protrudes from the facing surface toward the one end surface of the power storage element and extends in the third direction.

  According to this configuration, the inner spacer holds one end in the second direction of the power storage element adjacent to the inner spacer and both sides in the first direction by the one end side restricting portion (that is, by the first facing portion). The position shift of the power storage element to one side in the second direction is restricted, and the position shift in the second direction of the one end is restricted by sandwiching the one end by a pair of second facing parts. Therefore, the internal spacer adjacent to the power storage device and the power storage element are firmly engaged to improve the rigidity of the power storage device as a whole. As a result, the vibration resistance of the power storage device is improved.

  Moreover, the contact area between the first facing portion and the power storage element in the first direction is suppressed by the protrusions coming into contact with the power storage element, which makes it easy to fit the internal spacer and the power storage element in the first direction. Become.

  The first facing portion and the second facing portion may be connected to each other at two corners at the end of the power storage element.

  According to such a configuration, the rigidity of the inner spacer itself is improved, and the entire one end of the electricity storage element is held by the one end side restricting portion, so that the adjacent inner spacer and the electricity storage element are more firmly engaged. Therefore, the rigidity of the entire power storage device is further improved.

In the power storage device,
It is preferable that the ridge extends continuously from one corner of the two corners to the other corner.

  According to this configuration, the contact area in the third direction (the direction from one corner to the other corner) is sufficiently ensured while suppressing the contact area in the first direction between the one end side restricting portion and the power storage element. Therefore, the rigidity of the entire power storage device in the assembled state can be improved while maintaining the ease of fitting the inner spacer and the power storage element in the first direction during assembly.

In the power storage device,
The inner spacer is a second end side restricting portion that sandwiches the power storage element between the first end side restricting portion by contacting the other end portion in the second direction of the power storage element adjacent to the base. The other end side restricting portion extending from the base to both sides in the first direction may be provided.

  According to such a configuration, it is possible to suppress the displacement in the second direction of the power storage element adjacent to the inner spacer with respect to the inner spacer.

in this case,
The cross section of the ridge may be triangular.

  According to such a configuration, the other end of the electricity storage element is brought into contact with the other end side restricting portion, and one end of the electricity storage element is brought into contact with the inclined surface of the ridge (a hypotenuse in the triangular cross section). By pushing the power storage element toward the base in a state of being made to move, the one end is guided to the ridge of the ridge (tip in the protruding direction) along the inclined surface, and the ridge and the other end side restricting portion A power storage element fits between the two. For this reason, fitting with an electrical storage element and an internal spacer can be performed easily.

In the power storage device,
The other end side restricting portion is opposed to the facing surface of the first facing portion in the second direction and has a sandwiching surface for sandwiching the power storage element between the first facing portion and the base in the first direction. Have on each side,
The inner spacer is configured to be elastically deformable, and in a state where the power storage element is not sandwiched between the sandwiching surface and the first facing portion, the inner spacer is formed from the sandwiching surface in the second direction. The distance to the tip in the protruding direction may be smaller than the length of the power storage element in the second direction.

  According to such a configuration, in the state where the power storage element is fitted in the internal spacer, the gap between the clamping surface and the protrusion is widened (the internal spacer is elastically deformed), so that the internal spacer is elastically restored. The power storage element is clamped between the clamping surface and the protrusion in the second direction by force (force to return to the state before elastic deformation). Thereby, an internal spacer and an electrical storage element engage more firmly, As a result, the rigidity of an electrical storage apparatus improves more.

In the power storage device,
The base extends on both sides in the third direction to the position where the edge of the base is the same as the surface facing the power storage element in the second facing portion or to the position outside the facing surface of the second facing portion. It may be.

  According to such a configuration, the rigidity of the base (that is, the rigidity of the internal spacer) is improved as compared with the configuration in which the edge of the base enters the inside of the facing surface of the second facing portion on both sides in the third direction. The rigidity of the entire power storage device is also improved.

In the power storage device,
The other end side restricting portion has a pair of third facing portions that sandwich the other end portion of the power storage element in the second direction in the third direction,
The base extends on both sides in the third direction to the position where the edge of the base is the same as the surface facing the power storage element in the third facing portion or the position outside the facing surface of the third facing portion. It may be.

  According to such a configuration, the rigidity of the base (that is, the rigidity of the internal spacer) is improved as compared with the configuration in which the edge of the base enters the inside of the facing surface of the third facing portion on both sides in the third direction. The rigidity of the entire power storage device is also improved.

In the power storage device,
The tips in the first direction of the one end side restricting portions of the inner spacers adjacent to each other with the power storage element interposed therebetween may be in contact with each other.

  According to such a configuration, the entire end face at one end of the electricity storage element is covered by the one end side restricting portion of the internal spacer disposed on both sides of the electricity storage element, so that one end of the electricity storage element aligned in the first direction It becomes difficult to short-circuit the parts, that is, the insulation performance is improved.

  As described above, according to the present invention, it is possible to provide a power storage device capable of improving vibration resistance.

FIG. 1 is a perspective view of a power storage device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view in a state where a part of the configuration of the power storage device is omitted. FIG. 3 is an exploded perspective view in a state where a part of the configuration of the power storage device is omitted. FIG. 4 is a perspective view of a power storage element in the power storage device. FIG. 5 is a front view of the electricity storage element. FIG. 6 is a perspective view of an internal spacer in the power storage element. FIG. 7 is a cross-sectional view of the second restricting portion of the inner spacer and its periphery. FIG. 8 is a diagram for explaining a configuration in which the end edge in the Y-axis direction of the inner spacer enters the inside from the first restricting portion and the second restricting portion. FIG. 9 is a view for explaining a configuration in which the edge in the Y-axis direction of the inner spacer is outside the first restricting portion and the second restricting portion.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, the name of each component (each component) of this embodiment is a thing in this embodiment, and may differ from the name of each component (each component) in background art.

  As shown in FIGS. 1 to 3, the power storage device includes a power storage element 1, a spacer 2 adjacent to the power storage element 1, and a holding member 3 that holds the power storage element 1 and the spacer 2 together. The holding member 3 is formed of a conductive material. Accordingly, the power storage device includes an insulator 4 disposed between the power storage element 1 and the holding member 3.

  As shown in FIGS. 4 and 5, the power storage element 1 includes an unillustrated electrode body including a positive electrode and a negative electrode, a case 10 that houses the electrode body, and a pair of external terminals disposed on the outer surface of the case 10. 11. The power storage element 1 of the present embodiment is a so-called rectangular power storage element.

  The case 10 includes a case main body 100 having an opening, and a cover plate 101 that closes the opening of the case main body 100, and a pair of external terminals 11 are disposed on the outer surface.

  The case main body 100 includes a closing part 100a (see FIG. 3) and a cylindrical body part 100b connected to the periphery of the closing part 100a so as to surround the closing part 100a.

  The trunk portion 100b includes a pair of first walls 100c that face each other with a space therebetween, and a pair of second walls 100d that face each other across the pair of first walls 100c.

  Each of the first wall 100c and the second wall 100d is formed in a rectangular shape. That is, each surface of the first wall 100c and the second wall 100d is a rectangular flat surface. The first wall 100c and the second wall 100d are arranged adjacent to each other with their edges abutted against each other. The edge of the adjacent first wall 100c and the edge of the second wall 100d are connected over the entire length. Thereby, the trunk | drum 100b is formed in the square cylinder shape. One end of the trunk portion 100b is closed by the closing portion 100a. On the other hand, the other end of the body part 100b in the case body 100 is open. This opening is closed by the cover plate 101. In the present embodiment, the surface area of the first wall 100c is larger than the surface area of the second wall 100d. For this reason, the trunk | drum 100b is a flat square tube shape.

  The power storage device according to the present embodiment includes a plurality of power storage elements 1. Each of the plurality of power storage elements 1 is aligned in one direction (first direction). In the present embodiment, each of the plurality of power storage elements 1 is aligned with the first wall 100c of the case 10 facing in one direction (first direction). The power storage device includes an unillustrated bus bar that electrically connects the external terminals 11 of two adjacent power storage elements 1.

  In the following description, for convenience, the direction (first direction) in which the power storage elements 1 are aligned is referred to as the X-axis direction. In a coordinate system (orthogonal coordinate system) in which the three axes are orthogonal to each other, one direction (third direction) of the two axial directions orthogonal to the direction in which the storage elements 1 are aligned (X-axis direction) is the Y-axis direction. The remaining one direction (second direction) is referred to as the Z-axis direction. Accordingly, in each drawing, three orthogonal axes (coordinate axes) corresponding to the X-axis direction, the Y-axis direction, and the Z-axis direction are supplementarily illustrated.

  The spacer 2 has an insulating property. The spacer 2 includes a base adjacent to the power storage element 1 (specifically, the case 10, more specifically, the first wall 100c of the body part 100b), and a restricting portion that prevents displacement of the power storage element 1 adjacent to the base. Have

  The spacer 2 will be described more specifically. The power storage device includes a plurality of power storage elements 1 as described above. Accordingly, the power storage device includes two types of spacers 2 (2A and 2B) as shown in FIGS. That is, the power storage device includes a spacer (hereinafter referred to as an internal spacer) 2A disposed between two power storage elements 1 and a spacer (hereinafter referred to as an external) adjacent to the power storage element 1 at the end of the plurality of power storage elements 1. 2B).

  First, the inner spacer 2A will be described with reference to FIGS. The internal spacer 2A includes a base 20A adjacent to the power storage element 1 (the first wall 100c of the case body 100) and a restricting portion 21A that suppresses a positional shift of the power storage element 1 adjacent to the base 20A with respect to the base 20A. Further, the inner spacer 2A is a valve cover portion 22A protruding from the base 20A, and has a valve cover portion 22A disposed on the cover plate 101 (gas discharge valve 101a) of the electricity storage element 1.

  Base 20A of internal spacer 2A (hereinafter simply referred to as “base 20A”) is sandwiched between two power storage elements 1. That is, the power storage elements 1 are respectively disposed on both sides of the base 20A in the X-axis direction. The base 20A extends in a direction orthogonal to the X-axis direction. The base 20 </ b> A is a first surface facing one of the two adjacent power storage elements 1 and a second surface opposite to the first surface, and includes two power storage elements 1. And the second surface facing the other power storage element 1.

  The base 20 </ b> A is a first end disposed at a position corresponding to the cover plate 101 of the power storage element 1 and a second end opposite to the first end, and corresponds to the closing portion 100 a of the power storage element 1. And a second end disposed at the position. The base 20A is a third end disposed at a position corresponding to one second wall 100d of the power storage element 1, and a fourth end opposite to the third end, and the other end of the power storage element 1 And a fourth end disposed at a position corresponding to the second wall 100d.

  The base 20A includes a first corner which is a portion where the first end and the third end of the base 20A are connected, and a second corner which is a portion where the first end and the fourth end are connected. Have. Further, the base 20A has a third triangular portion that is a portion where the second end and the third end are connected, and a fourth corner portion that is a portion where each of the second end and the fourth end is connected. .

  Note that the first end and the second end of the base 20A extend in the Y-axis direction. The third end and the fourth end of the base 20A extend in the Z-axis direction. Therefore, the base 20A has a substantially rectangular shape when viewed in the X-axis direction. Further, the base 20 </ b> A is approximately the same size (corresponding) as the first wall 100 c of the electricity storage device 1.

  In the power storage device according to the present embodiment, a fluid (cooling fluid) is provided between at least one of the first surface of the base 20A and the power storage device 1 and between the second surface of the base 20A and the power storage device 1. ) Is formed.

  The cross section of the base 20A of the present embodiment has a rectangular wave shape. This will be described more specifically. The base 20 </ b> A contacts the first contact portion 200 </ b> A that contacts only one of the two adjacent storage elements 1 and only the other storage element 1 of the two adjacent storage elements 1. It has the 2nd contact part 200B and the connection part 200C which connects the 1st contact part 200A and the 2nd contact part 200B. The first contact portion 200A is long in the Y-axis direction. The second contact portion 200B is long in the Y-axis direction.

  The base 20A of the present embodiment includes a plurality of first contact portions 200A and a plurality of second contact portions 200B. The first contact portions 200A and the second contact portions 200B are alternately arranged in the Z-axis direction.

  Thus, in the power storage device, a ventilation path is formed by the surface of the first contact portion 200A opposite to the surface that contacts the power storage element 1 and the pair of connection portions 200C connected to the first contact portion 200A. Is done. In the power storage device, a ventilation path is formed by the surface of the second contact portion 200B opposite to the surface that contacts the power storage element 1 and the pair of connection portions 200C connected to the second contact portion 200B. The

  The restricting portion 21A suppresses (regulates) displacement in the YZ plane (plane including the Y axis and Z axis) direction with respect to the inner spacer 2A (base 20A) of the power storage element 1 on both sides in the X axis direction. Thereby, 21 A of control parts can control the relative movement of the two electrical storage elements 1 adjacent to 2 A of internal spacers. Specifically, the restricting portion 21A extends from the base 20 to both sides in the X-axis direction. That is, the restricting portion 21A extends from the base 20A toward the power storage element 1 adjacent to the first surface of the base 20A of the inner spacer 2A and to the power storage element 1 adjacent to the second surface of the base 20A of the inner spacer 2A. It extends from the base 20A.

  This will be described more specifically. The restricting portion 21A is formed on the peripheral portion of the base 20A. The restricting portion 21 </ b> A of the present embodiment includes a first restricting portion (other-end-side restricting portion) 210 </ b> A that contacts an end portion (the other end portion) on the cover plate 101 side of the electricity storage element 1 and a closing portion 100 a of the electricity storage element 1. And a second restricting portion (one end restricting portion) 211 </ b> A that abuts on the side end portion (one end portion).

  211 A of 2nd control parts are extended toward the electrical storage element 1 adjacent to the 1st surface of the base 20A of the internal spacer 2A, and the electrical storage element 1 adjacent to the 2nd surface of the base 20A of the internal spacer 2A. The second restricting portion 211A comes into contact with the respective closed portions 100a of the power storage element 1 disposed on both sides of the base 20A of the inner spacer 2A and the one second wall 100d of the trunk portion 100b.

  Specifically, the second restricting portion 211A includes a first facing portion 2111 having a facing surface 2111A facing the surface (one end surface) of the closing portion 100a of the power storage element 1 on both sides in the X-axis direction of the base 20A. A pair of second opposing portions 2112 that sandwich the end on the closed portion 100a side of the electricity storage element 1 in the Y-axis direction, and a protruding surface 2111A of the first opposing portion 2111 from the opposing surface 2111A toward the closed portion 100a of the electricity storage device 1, and Y And a protrusion 2114 extending in the axial direction. The first facing portion 2111 extends from the base 20A in the X-axis direction and extends in the Y-axis direction. The second facing portion 2112 extends from the base 20A in the X-axis direction and extends in the Z-axis direction. The both ends of the first opposing portion 2111 and each of the pair of second opposing portions 2112 are at the third triangular portion and the fourth rectangular portion of the base 20B (in other words, at the end portion on the closing portion 100a side of the storage element 1). Are connected to each other at two corners).

  The second restricting portion 211A has a facing surface 2113A including a facing surface 2111A facing the power storage element 1 in the first facing portion 2111 and a facing surface 2112A facing the power storage element 1 in the second facing portion 2112. . The opposing surface 2113A of the second restricting portion 211A has one corner portion (for example, one of the two corner portions at the end portion on the closing portion 100a side of the power storage element 1 on each side of the base 20A in the X-axis direction (for example, From the corner of the base 20A corresponding to the first triangular portion) to the other corner (for example, the corner corresponding to the second corner of the base 20A) so as to face the closing portion 100a of the electricity storage device 1. It extends continuously and both ends are bent along the two corners. Note that the facing surface 2112A of the pair of second facing portions 2112 facing the power storage element 1 may be a flat surface, and irregularities, protrusions, or the like may be formed in accordance with the contact state with the power storage element 1.

  The second restricting portion 211A has protrusions 2114 extending in the Y-axis direction and projecting from the facing surface 2113A of the second restricting portion 211A toward the closing portion 100a of the power storage device 1 on both sides in the X-axis direction ( (See FIG. 7). The protrusion 2114 of the present embodiment continuously extends from the one corner to the other corner at the end of the power storage element 1 on the closing portion 100a side in the Y-axis direction. Further, the cross section (cross section in the XZ plane direction) at each position in the Y-axis direction of the protrusion 2114 has a triangular shape.

  210 A of 1st control parts are the electrical storage element (one electrical storage element) 1 adjacent to the 1st surface of the base 20A of the internal spacer 2A, and the electrical storage element (other electrical storage element) adjacent to the 2nd surface of the base 20A of the internal spacer 2A. Extending toward the element 1). The first restricting portion 210A is in contact with the end portion on the cover plate 101 side of the electricity storage element 1 adjacent to the base 20A, thereby sandwiching the electricity storage element 1 between the second restricting portion 211A.

  Specifically, the first restricting portion 210A has a pair of third facing portions 2101 that sandwich the end on the cover plate 101 side of the power storage element 1 in the Y-axis direction on both sides in the X-axis direction of the base 20A. Further, the first restricting portion 210A of the present embodiment is opposed to the facing surface 2111A of the first facing portion 2111 on both sides in the X-axis direction of the base 20A, and between the first facing portion 2111 and the storage element 1 has a pair of fourth facing portions 2102 each having a sandwiching surface 2102A for sandwiching 1. The pair of fourth facing portions 2102 are provided at positions corresponding to the two corner portions at the end portion on the cover plate 101 side of the power storage element 1 with a space in the Y-axis direction. One third facing portion 2101 of the pair of third facing portions 2101 and one fourth facing portion 2102 of the pair of fourth facing portions 2102 are connected at the first corner of the base 20A. . The other third opposing portion 2101 of the pair of third opposing portions 2101 and the other fourth opposing portion 2102 of the pair of fourth opposing portions 2102 are connected at the second corner of the base 20A. Has been. 210 A of 1st control parts hold | maintain each corner | angular part of the both ends of the Y-axis direction in the edge part by the side of the cover plate 101 of the electrical storage element 1 in the both sides in the X-axis direction of base 20A. That is, two corners at the end on the cover plate 101 side of the power storage element 1 abut on the first restricting portion 210A, so that the YZ plane direction with respect to the base 20A at the end on the cover plate 101 side of the power storage element 1 Is displaced. Note that the pair of sandwiching surfaces 2102 </ b> A may be flat, and irregularities, ridges, and the like may be formed in accordance with the contact state with the power storage element 1. Further, the facing surface 2101 </ b> A of the third facing portion 2101 facing the power storage element 1 may also be a flat surface, and irregularities, ridges, etc. may be formed in accordance with the contact state with the power storage element 1.

  In the internal spacer 2A configured as described above, the power storage element 1 is not sandwiched between the first facing portion 2111 and the fourth facing portion 2102 (the power storage element 1 and the internal spacer 2A are not fitted together). In the state), the distance from the clamping surface 2102A of the fourth facing portion 2102 in the Z-axis direction to the peak of the protrusion 2114 (tip in the protruding direction) is smaller than the length of the power storage element 1 in the Z-axis direction. Note that the internal spacer 2A of the present embodiment is made of resin. For this reason, the inner spacer 2A can be elastically deformed. For this reason, in the internal spacer 2A of the present embodiment, the power storage element 1 is fitted (sandwiched) between the first facing portion 2111 (specifically the protrusion 2114) and the fourth facing portion 2102 (specifically the clamping surface 2102A). Can).

  Further, in the internal spacer 2A of the present embodiment, the sandwiching surface 2102A of the fourth facing portion 2102 in the Z-axis direction in a state where the power storage element 1 is not sandwiched between the first facing portion 2111 and the fourth facing portion 2102. To the facing surface 2111A of the first facing portion 2111 is larger than the length of the power storage element 1 in the Z-axis direction.

  Since the power storage device according to this embodiment includes a plurality of power storage elements 1 as described above, the internal spacers 2 </ b> A are disposed between the adjacent power storage elements 1. That is, the power storage device includes a plurality of internal spacers 2A. And the front-end | tips in the X-axis direction of the 2nd control part 211A of the internal spacer 2A adjacent on both sides of the electrical storage element 1 are contact | abutting. That is, in the power storage device of the present embodiment, the closing portion 100a of each power storage element 1 is covered with the second restricting portion 211A (specifically, the first facing portion 2111).

  Next, returning to FIGS. 2 and 3, the outer spacer 2B will be described. The outer spacer 2B includes a base 20B arranged so as to be aligned with the power storage element 1, and a regulation portion 21B that suppresses a positional shift of the power storage element 1 adjacent to the base 20B with respect to the base 20B. Base 20B extends along power storage element 1 (specifically, first wall 100c of case body 100). The base 20B has a first surface facing the power storage element 1 (specifically, the first wall 100c of the case main body 100) and a second surface opposite to the first surface.

  In the external spacer 2 </ b> B according to the present embodiment, the base 20 </ b> B and a termination member 30 described later of the holding member 3 are opposed to each other. That is, the external spacer 2 </ b> B of the present embodiment is disposed between the electricity storage element 1 and the termination member 30. Accordingly, the outer spacer 2B has a fitting portion 22B that fits the termination member 30 at a position facing the termination member 30 of the base 20B. That is, the outer spacer 2B is a fitting portion 22B for determining the position of the termination member 30 with respect to the base 20B, and has a fitting portion 22B formed on the second surface of the base 20B. The outer spacer 2B is a shaft portion 23B for determining the position of the termination member 30 with respect to the base 20B, and has a shaft portion 23B protruding from the second surface of the base 20B.

  The external spacer 2B is a first protrusion 24B that protrudes from the second surface of the base 20B toward the end member 30, and has a first protrusion (hereinafter referred to as an external contact portion) 24B that contacts the end member 30. . The external contact portion 24 </ b> B protrudes from the base 20 </ b> B of the external spacer 2 </ b> B toward the termination member 30 and is in contact with the termination member 30. Therefore, in the power storage device, a gap is formed between the external spacer 2 </ b> B and the termination member 30. In addition, the external spacer 2B of the present embodiment is a second protrusion 201B that protrudes from the first surface of the base 20B toward the power storage element 1, and is a second protrusion (hereinafter referred to as an internal protrusion) that contacts the power storage element 1. 201B).

  The base 20B of the outer spacer 2B extends in the YZ plane direction. That is, the base 20B is formed in a plate shape. The base 20B has a substantially rectangular shape when viewed in the X-axis direction. Further, the base 20 </ b> B is approximately the same size (corresponding) as the first wall 100 c of the electricity storage device 1.

  Between the first surface of the base 20 </ b> B and the power storage element 1, an air passage for allowing fluid to pass is formed. More specifically, the base 20B has an internal contact portion 201B that extends from the first surface of the base 20B toward the case 10 of the power storage device 1 (specifically, the first wall 100c of the case body 100).

  The internal contact portion 201B extends in the Y-axis direction. The base 20B according to the present embodiment has a plurality of internal contact portions 201B. And each of the some internal contact part 201B is arrange | positioned at intervals in the Z-axis direction (direction orthogonal to a longitudinal direction). Thereby, a plurality of ventilation paths (not numbered) are formed between the base 20B of the external spacer 2B and the power storage element 1.

  The restricting portion 21B restricts displacement (relative movement) of the power storage element 1 adjacent to the first surface of the outer spacer 2B with respect to the base 20B. The restricting portion 21B extends from the base 20B toward the power storage element 1 adjacent to the first surface of the base 20B. The restricting portion 21B includes an end portion in the Y-axis direction of the cover plate 101 and a second end portion at two corner portions (joint portion between the cover plate 101 and the second wall 100d) at the end portion on the cover plate 101 side of the power storage element 1. It has a pair of first opposing surfaces 213B that come into contact with the end of the wall 100d in the Z-axis direction. The restricting portion 21B has a second facing surface 214B. Specifically, the second facing surface 214B faces the closing portion 100a of the electricity storage element 1 from one corner to the other corner of the two corners at the end of the electricity storage element 1 on the closing portion 100a side. Thus, both ends are bent along the two corners. The restricting portion 21B has a protrusion 217B that extends in the Y-axis direction and protrudes from the second facing surface 214B toward the closing portion 100a of the energy storage device 1. The protrusion 217B of the present embodiment continuously extends from the one corner to the other corner at the end of the power storage element 1 on the closing portion 100a side in the Y-axis direction. Further, the cross section (cross section in the XZ plane direction) at each position in the Y-axis direction of the protrusion 217B has a triangular shape.

  By holding both ends in the Y-axis direction of the electricity storage element 1 by the above-described second opposing surface 214B and the pair of first opposing surfaces 213B, positional deviation in the YZ plane direction with respect to the base 20B of the electricity storage element 1 is regulated. Is done.

  The power storage device of the present embodiment includes a pair of external spacers 2B configured as described above. The outer spacer 2 </ b> B is adjacent to the power storage element 1 at the end of the plurality of power storage elements 1. That is, a pair of external spacers 2B are provided so as to sandwich a plurality of aligned power storage elements 1 in the X-axis direction.

  As shown in FIGS. 1 and 2, the holding member 3 includes a pair of termination members 30 disposed at positions adjacent to the external spacers 2 </ b> B, and a frame 31 that connects each of the pair of termination members 30. Is provided.

  Each of the pair of termination members 30 extends along the power storage element 1 (specifically, the first wall 100c). Termination member 30 has a first surface facing outer spacer 2B and a second surface opposite to the first surface. The termination member 30 of the present embodiment has a plurality (four in this embodiment) of through holes 300b formed at each corner. Moreover, the termination | terminus member 30 has the press-contact part 300 contact | abutted to the external contact part 24B extended from the base 20B of the external spacer 2B. The pressure contact portion 300 has an insertion hole 300a formed at a position corresponding to the shaft portion 23B of the outer spacer 2B.

  The frame 31 has a plurality of connecting portions extending between the pair of termination members 30. The frame 31 of the present embodiment includes a pair of first connection portions 310 disposed at positions corresponding to the cover plate 101 of the power storage element 1 and a pair of first connection portions disposed at positions corresponding to the closing portions 100a of the power storage element 1. And two connection portions 311. Further, the frame 31 has a fixing portion 313 that is connected to the terminal member 30.

  Each of the pair of first connection portions 310 has a first end in a longitudinal direction and a second end opposite to the first end. Each of the pair of second connection portions 311 has a first end and a second end opposite to the first end in a longitudinal direction.

  The fixing portion 313 includes a pair of first fixing portions 313a formed at the first ends and the second ends of the pair of first connection portions 310, and a first end of the pair of second connection portions 311, respectively. It has a pair of 2nd fixing | fixed part 313b formed in a 2nd end.

  One first fixing portion 313a opposes the peripheral portion of the through hole 300b in the one end member 30 in the X-axis direction. The other first fixing portion 313a faces the peripheral portion of the through hole 300b in the other end member 30 in the X-axis direction. And each of a pair of 1st fixing | fixed part 313a has the 1st hole part 313c formed in the position corresponding to the through-hole 300b. The first connecting portion 310 is coupled to the terminating member 30 by screwing a nut into a bolt inserted into the through hole 300b of the terminating member 30 and the first hole 313c of the first fixing portion 313a.

  The one second fixing portion 313b faces the peripheral portion of the through hole 300b in the one end member 30 in the X-axis direction. The other second fixing portion 313b faces the peripheral portion of the through hole 300b in the other end member 30 in the X-axis direction. And each of a pair of 2nd fixing | fixed part 313b has the 2nd hole part 313d formed in the position corresponding to the through-hole 300b. The second connecting portion 311 is connected to the terminating member 30 by screwing a nut into a bolt inserted into the through hole 300b of the terminating member 30 and the second hole 313d of the second fixing portion 313b.

  The insulator 4 is made of an insulating material. The insulator 4 includes a pair of first insulating portions 40 disposed between each of the pair of first connection portions 310 and the power storage element 1, each of the pair of second connection portions 311, and the power storage element 1. And a pair of second insulating portions 41 disposed between the two.

  According to the above power storage device, the inner spacer 2A holds the end on the closing portion 100a side of the power storage element 1 adjacent to the inner spacer 2A on both sides in the X-axis direction by the second restricting portion 211A (ie, The first facing portion 2111 regulates the displacement of the electricity storage element 1 to one side in the Z-axis direction, and the pair of second facing portions 2112 sandwiches the end portion on the closing portion 100a side to thereby close the closing portion 100a side. Therefore, the inner spacer 2A adjacent to the power storage device 1 and the power storage element 1 are firmly engaged in the power storage device, thereby improving the rigidity of the power storage device as a whole. As a result, the vibration resistance of the power storage device is improved.

  Moreover, in the power storage device of the present embodiment, the protrusion 2114 extending in the Y-axis direction in the second restricting portion 211A comes into contact with the power storage element 1, whereby the first opposing portion 2111 and the power storage element 1 are in the X-axis direction (first Direction) is reduced. This facilitates the fitting of the inner spacer 2A and the electricity storage element 1 in the X-axis direction.

  In the power storage device of the present embodiment, the first facing portion 2111 and the second facing portion 2112 are connected to each other at two corners at the end of the power storage element 1 on the closing portion 100a side. As a result, the rigidity of the inner spacer 2A itself is improved, and the entire end on the closed portion 100a side of the electricity storage element 1 is held by the second restricting portion 211A, so that the adjacent inner spacer 2A and the electricity storage element 1 are more Since it is engaged firmly, the rigidity of the entire power storage device is further improved.

  In the power storage device of the present embodiment, the ridge 2114 extends continuously from one corner to the other corner at the end of the power storage element 1 on the closed portion 100a side. For this reason, it is possible to sufficiently secure the contact area in the Y-axis direction (third direction) while suppressing the contact area in the X-axis direction between the second restricting portion 211A and the power storage element 1. Thereby, the rigidity of the whole electrical storage apparatus in the assembled state can be improved while maintaining the ease of fitting the inner spacer 2A and the electrical storage element 1 during assembly.

  In the power storage device of the present embodiment, since the inner spacer 2A has the first restricting portion 210A, it is possible to suppress the displacement of the adjacent power storage element 1 to the other side in the Z-axis direction with respect to the inner spacer 2A. it can. That is, the inner spacer 2A can restrict (suppress) the positional deviation of the adjacent power storage element 1 in the Z-axis direction with respect to the inner spacer 2A by the first restricting portion 210A and the second restricting portion 211A.

  In the power storage device of the present embodiment, the cross section of the protrusion 2114 provided in the second restricting portion 211A has a triangular shape. For this reason, the end on the cover plate 101 side of the electricity storage element 1 is brought into contact with the first restricting portion 210A (specifically, the sandwiching surface 2102A), and the end on the closing portion 100a side of the electricity storage element 1 is protruded 2114. By pushing the power storage element 1 toward the base while being in contact with the inclined surface (the oblique side in the triangular cross section), the end on the closed portion 100a side of the protrusion 2114 extends along the inclined surface. Guided to the peak (tip in the protruding direction). Thereby, the electrical storage element 1 fits between the protrusion 2114 and 210 A of 1st control parts. Thus, according to the power storage device of the present embodiment, the power storage element 1 and the inner spacer 2A can be easily fitted together.

  In the power storage device of the present embodiment, the internal spacer 2A is configured to be elastically deformable, and in a state where the power storage element 1 is not sandwiched between the sandwiching surface 2102A and the first facing portion 2111, the Z-axis direction The distance from the clamping surface 2102A to the tip of the protrusion 2114 in the protruding direction is smaller than the length of the power storage element 1 in the Z-axis direction.

  In the state where the power storage element 1 is fitted in the internal spacer 2A, the gap between the holding surface 2102A and the protrusion 2114 is expanded (the internal spacer is elastically deformed). For this reason, the electrical storage element 1 is clamped by the clamping surface 2102A and the protrusion 2114 in the Z-axis direction by the elastic return force of the inner spacer 2A (force to return the state before elastic deformation). Thereby, inner spacer 2A and power storage element 1 are more firmly engaged, and as a result, the rigidity of the power storage device is further improved.

  In the base 20A of the inner spacer 2A in the present embodiment, the edges (third end and fourth end) of the base 20A are at the same position as the facing surface 2112A of the second facing portion 2112 on both sides in the Y-axis direction. For this reason, for example, at least a part of the edge 2115 of the base 20A of the inner spacer 2A on the both sides in the Y-axis direction as shown in FIG. 8 is inward of the facing surface 2112A of the second facing portion 2112. The rigidity of the base 20A (that is, the rigidity of the inner spacer 2A) is improved. Therefore, the rigidity of the entire power storage device is also improved.

  Further, in the base 20A of the inner spacer 2A in the present embodiment, the edges (third end and fourth end) of the base 20A are at the same position as the facing surface 2101A of the third facing portion 2101 on both sides in the Y-axis direction. is there. For this reason, for example, at least a part of the edge 2115 of the base 20A of the inner spacer 2A on the both sides in the Y-axis direction as shown in FIG. The rigidity of the base 20A (that is, the rigidity of the inner spacer 2A) is improved. Therefore, the rigidity of the entire power storage device is also improved.

  In the power storage device of the present embodiment, the tips in the X-axis direction of the second restricting portions 211A of the inner spacers 2A adjacent to each other with the power storage element 1 in between are in contact with each other. As a result, the entire end surface of the end portion on the closed portion 100a side of the power storage element 1 is covered with the second restricting portions 211A of the internal spacer 2A disposed on both sides of the power storage element 1, so that the power storage elements aligned in the X-axis direction 1 is difficult to short-circuit between the end portions on the closed portion 100a side, that is, the insulating performance is improved.

  In addition, the electrical storage apparatus which concerns on this invention is not limited to the said one Embodiment, Of course, in the range which does not deviate from the summary of this invention, various changes are made.

  Although the protrusion 2114 is provided in the 2nd control part 211A of the said embodiment, it is not limited to this structure. For example, the second restricting portion 211 </ b> A may not have the protrusion 2114 as long as it has the facing surface 2111 </ b> A of the first facing portion 2111 and the facing surfaces 2112 </ b> A of the pair of second facing portions 2112. Also with such a configuration, the inner spacer 2A has the entire end on the closing portion 100a side of the power storage element 1 adjacent to the inner spacer 2A on both sides in the X-axis direction, the opposing surface 2111A of the first opposing portion 2111 and the pair of first The two opposing portions 2112 are held by the opposing surface 2112A. For this reason, in the power storage device, the adjacent internal spacer 2A and the power storage element 1 are firmly engaged to improve the rigidity of the power storage device as a whole, so that the vibration resistance of the power storage device is improved.

  In the power storage device of the above embodiment, the protrusion 2114 is continuous from one corner to the other corner at the end of the power storage element 1 on the closing portion 100a side in the Y-axis direction, but is limited to this configuration. Not. The protrusion 2114 in the second restricting portion 211A may extend intermittently in the Y-axis direction. Also with this configuration, the contact area in the X-axis direction between the second restricting portion 211A and the power storage element 1 can be suppressed.

  In the power storage device of the above embodiment, the second facing portion 2112 of the second restricting portion 211A covers only the end portion on the closed portion 100a side of the second wall 100d of the power storage element 1 in the Z-axis direction. It is not limited to the configuration. For example, the second facing portion 2112 may cover from the position of the closing portion 100a of the power storage element 1 to the center portion of the second wall 100d in the Z-axis direction, or may cover the entire second wall 100d. . The second opposing portion 2112 only needs to be connected to both ends of the first opposing portion 2111 in the Y-axis direction.

  In the base 20A of the inner spacer 2A in the above embodiment, the edges (third end and fourth end) of the base 20A are at the same position as the facing surface 2112A of the second facing portion 2112 on both sides in the Y-axis direction. The configuration is not limited to this. For example, as shown in FIG. 9, the edge 2116 in the Y-axis direction of the base 20A of the inner spacer 2A may be outside the facing surface 2112A of the second facing portion 2112. Even with such a configuration, at least a part of the edge 2115 of the base 20A of the inner spacer 2A on both sides in the Y-axis direction as shown in FIG. The rigidity of the base 20A (that is, the rigidity of the inner spacer 2A) is improved.

  In the base 20A of the inner spacer 2A in the above embodiment, the edges (third end and fourth end) of the base 20A are at the same position as the facing surface 2101A of the third facing portion 2101 on both sides in the Y-axis direction. Although there is, it is not limited to this structure. For example, as shown in FIG. 9, the edge 2116 in the Y-axis direction of the base 20A of the inner spacer 2A may be outside the facing surface 2101A of the third facing portion 2101. Even with such a configuration, at least a part of the edge 2115 of the base 20A of the inner spacer 2A on both sides in the Y-axis direction as shown in FIG. The rigidity of the base 20A (that is, the rigidity of the inner spacer 2A) is improved. Therefore, the rigidity of the entire power storage device is also improved.

  In the above embodiment, the base 20 </ b> A of the inner spacer 2 </ b> A has a substantially rectangular shape, and is approximately the same size as the first wall 100 c of the electricity storage device 1. However, the base 20 </ b> A of the inner spacer 2 </ b> A is not limited to a substantially rectangular shape as long as the postures of the two adjacent power storage elements 1 can correspond to each other, and the first wall 100 c of the power storage element 1 It is not limited to what is a substantially equivalent magnitude | size.

  In the above embodiment, the base 20 </ b> A of the inner spacer 2 </ b> A has a rectangular wave shape, thereby forming a ventilation path between the base 20 </ b> A and the power storage element 1. However, if the base 20A of the inner spacer 2A allows fluid to pass between the first surface and the electricity storage device 1 (between the second surface and the electricity storage device 1), the shape of the base 20A is a rectangular wave shape. It is not limited to a certain thing. Moreover, when it is not necessary to form a ventilation path between the base 20A of the inner spacer 2A and the power storage element 1, the base 20A of the inner spacer 2A may be formed in a flat plate shape.

  DESCRIPTION OF SYMBOLS 1 ... Power storage element, 10 ... Case, 100 ... Case main body, 100a ... Closure part, 100b ... Trunk part, 100c ... First wall, 100d ... Second wall, 101 ... Cover plate, 101a ... Gas exhaust valve, 11 ... External Terminal, 2 ... Spacer, 20 ... Base, 2A ... Internal spacer, 20A ... Base, 200A ... First contact portion, 200B ... Second contact portion, 200C ... Connection portion, 201B ... Internal contact portion (second protrusion) ), 21A ... regulating portion, 210A ... first regulating portion, 2101 ... third facing portion, 2101A ... facing surface, 2102 ... fourth facing portion, 2102A ... clamping surface, 211A ... second regulating portion, 2111 ... first facing. Part 2111A ... opposing face 2112 ... second opposing part 2112A ... opposing face 2114 ... ridge 22A ... valve cover part 2B ... external spacer 20B ... base 21B ... regulating part 213B ... first opposing , 214B ... second facing surface, 217B ... projection, 22B ... fitting portion, 23B ... shaft portion, 24B ... external contact portion (first projection portion), 3 ... holding member, 30 ... terminal member, 300 ... pressure contact portion , 300a ... insertion hole, 300b ... through hole, 31 ... frame, 310 ... first connection part, 311 ... second connection part, 313 ... fixing part, 313a ... first fixing part, 313b ... second fixing part, 313c ... 1st hole part, 313d ... 2nd hole part, 4 ... Insulator, 40 ... 1st insulation part, 41 ... 2nd insulation part

Claims (9)

A storage element which is a square storage element and is aligned in the first direction;
An internal spacer disposed between the power storage elements,
The inner spacer is a base extending in a direction orthogonal to the first direction, the base in which the power storage element is disposed on both sides of the first direction, and the second direction orthogonal to the first direction. A restricting portion that is in contact with one end face of the electricity storage element and suppresses the positional deviation of the electricity storage element with respect to the base, and has one end side restriction portion that extends from the base to both sides in the first direction, and
The one end side restricting portion is
A first facing portion having a facing surface facing the one end surface of the power storage element;
A pair of second opposing portions sandwiching an end portion including the one end face of the power storage element in a third direction orthogonal to the first direction and the second direction;
A power storage device comprising: a protrusion projecting from the facing surface toward the one end surface of the power storage element and extending in the third direction.   The power storage device according to claim 1, wherein the first facing portion and the second facing portion are connected to each other at two corners at the end of the power storage element.   The power storage device according to claim 1, wherein the protrusion continuously extends from one corner of the two corners to the other corner.   The inner spacer is a second end side restricting portion that sandwiches the power storage element between the first end side restricting portion by contacting the other end portion in the second direction of the power storage element adjacent to the base. The power storage device according to any one of claims 1 to 3, further comprising other-end-side regulating portions that extend from the base to both sides in the first direction.   The power storage device according to claim 4, wherein a cross section of the protrusion is triangular. The other end side restricting portion is opposed to the facing surface of the first facing portion in the second direction and has a sandwiching surface for sandwiching the power storage element between the first facing portion and the base in the first direction. Have on each side,
The inner spacer is configured to be elastically deformable, and in a state where the power storage element is not sandwiched between the sandwiching surface and the first facing portion, the inner spacer is formed from the sandwiching surface in the second direction. The power storage device according to claim 4 or 5, wherein an interval to the tip in the protruding direction is smaller than a length of the power storage element in the second direction.   The base extends on both sides in the third direction to the position where the edge of the base is the same as the surface facing the power storage element in the second facing portion or to the position outside the facing surface of the second facing portion. The power storage device according to any one of claims 4 to 6. The other end side restricting portion has a pair of third facing portions that sandwich the other end portion of the power storage element in the second direction in the third direction,
The base extends on both sides in the third direction to the position where the edge of the base is the same as the surface facing the power storage element in the third facing portion or the position outside the facing surface of the third facing portion. The power storage device according to any one of claims 4 to 7.   The power storage device according to claim 1, wherein tips in the first direction of the one end side restricting portions of the internal spacers adjacent to each other with the power storage element in between are in contact with each other.

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