JP6590243B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including a plurality of power storage elements.

  Conventionally, a battery module including a plurality of battery cells is known (see Patent Document 1). Specifically, the battery module includes a plurality of stacked battery cells, a cell holder for storing the battery cells by combining two adjacent cells disposed between the battery cells, and the cell holder for the battery cells. And a guide member that is slidably supported in the stacking direction.

  In the battery module, since the cell holder in a state where the battery cells are accommodated is slidable in the stacking direction of the battery cells, when acceleration in the stacking direction occurs in the battery module, A force resulting from the acceleration such as an inertial force generated in each of the other battery cells is applied to the arranged battery cells. For this reason, in the battery module, when the number of battery cells stacked (the number of battery cells arranged in the stacking direction) is increased, it is necessary to reinforce the rigidity of the battery cells disposed at the end portion. As a result, an increase in the size of the power storage device, an increase in the weight of the power storage device, and the like occur.

Japanese Patent Laying-Open No. 2015-5362

  Therefore, the present invention suppresses the force caused by the acceleration applied to the power storage element disposed at the end in the first direction when acceleration occurs even when the power storage element includes a plurality of power storage elements arranged in the first direction. It is an object of the present invention to provide a power storage device that can be used.

The power storage device according to the present invention includes:
A plurality of power storage elements arranged in a first direction;
At least one spacer disposed between adjacent power storage elements;
An opposing member that opposes the spacer in a second direction orthogonal to the first direction and that is fixed directly or indirectly to the device to be attached;
At least one of the spacer and the opposing member has an insertion portion protruding in the second direction,
At least the other of the spacer and the opposing member has at least one inserted portion that defines an open portion that opens in a direction in which the insertion portion enters and the insertion portion enters,
Each of the insertion portion and the insertion target portion has a portion facing in the first direction,
The outer dimension in the first direction of the insertion part is smaller than the opening dimension in the first direction of the opening part.

  According to such a configuration, when acceleration in the stacking direction (including an acceleration component) occurs in the power storage device, the insertion portion and the insertion portion entering the insertion portion abut in the first direction (or Force) (for example, inertial force) generated by the power storage element disposed on the acceleration direction side of the spacer having the insertion portion or the insertion portion can be received by the opposing member. A force (force resulting from the acceleration) applied to the power storage element disposed at the end portion in the first direction can be suppressed.

  In addition, in the first direction, the outer dimension of the insertion part is smaller than the opening dimension of the opening part (open part defined by the inserted part), so that the insertion part due to expansion, contraction, etc. of the power storage element during assembly of the power storage device Even if the relative position in the first direction with respect to the insertion portion is deviated from the planned relative position (design value or the like), the insertion portion can be inserted into the insertion portion.

In the power storage device,
The insertion portion has a transmission surface facing the first direction,
The insertion portion is a transmission surface that faces the transmission surface in a first direction and defines a part of the open portion, and the insertion portion that has entered the insertion portion contacts the transmission surface. It is preferable to have a transmitted surface through which force is transmitted from the transmitting surface.

  According to such a configuration, when the acceleration in the stacking direction (including the acceleration component) occurs in the power storage device, the transmission surface of the insertion portion and the transmission surface of the insertion portion abut (or abut). Thus, a sufficient contact area between the insertion portion and the insertion portion is ensured, whereby a force (for example, inertial force) generated by the power storage element arranged on the acceleration direction side from the spacer having the insertion portion or the insertion portion is obtained. It can be reliably received by the opposing member.

In the power storage device,
The insertion part is a single convex part,
Each of both surfaces in the first direction of the base end portion of the convex portion includes the transmission surface,
Both surfaces in the first direction of the front end portion of the convex portion may be continuous with the transmission surface and may be closer to each other from the base end side of the convex portion toward the front end.

  According to such a configuration, even when the relative position in the first direction between the insertion portion and the insertion portion is deviated from a planned relative position such as a design value when the power storage device is assembled, the insertion portion (convex portion) ) Enters the insertion portion (open portion), the insertion portion (convex portion) is inserted into the insertion portion by the both surfaces of the insertion portion (convex portion) by bringing the spacer and the opposing member closer to each other in the second direction. Guided into (open part). As described above, according to the configuration, the tip shape of the insertion portion (both sides) improves the assembly efficiency by correcting the displacement of the relative position in the first direction between the insertion portion and the insertion portion when the power storage device is assembled. When the acceleration in the stacking direction is generated in the power storage device by the transmission surface continuous on both surfaces and the transmission surface of the insertion portion, the insertion portion or the spacer having the insertion portion is arranged on the acceleration direction side. It is possible to secure a contact area that allows the opposing member to receive the force generated by the stored power storage element.

In the power storage device,
The insertion portion has two convex portions that are aligned in the first direction and enter the common inserted portion,
Each of the outer surfaces facing away from each other in the first direction of the base end portions of the two convex portions includes the transmission surface,
The outer surfaces facing away from each other in the first direction of the distal end portions of the two convex portions may be continuous with the transmission surface, and may approach each other toward the distal end from the proximal end side of the convex portion.

  According to this configuration, even when the relative position in the first direction between the insertion portion and the insertion portion is deviated from the planned relative position when the power storage device is assembled, the tip of each convex portion is inserted. If it enters into (open part), an insertion part (two convex parts) will be inserted part (open part) by the outer surface of either convex part by making a spacer and a counter member approach in the 2nd direction. You will be guided in. As described above, according to the above configuration, the displacement of the relative position in the first direction between the insertion portion and the inserted portion is corrected when the power storage device is assembled by the tip shape of the insertion portion (each outer surface of the two convex portions). The spacer having the insertion portion or the insertion portion when acceleration in the stacking direction is generated in the power storage device by the transmission surface continuous on both surfaces and the transmission surface of the insertion portion while improving the assembly efficiency It is possible to secure a contact area that allows the opposing member to receive the force generated by the power storage element disposed on the acceleration direction side.

In the power storage device,
A pair of the insertion portions are provided at different positions in the first direction,
A pair of the inserted portions are provided corresponding to the insertion portions,
Each of the outer surfaces facing in directions away from each other in the first direction of the pair of insertion portions may approach each other from the proximal end side toward the distal end.

  According to such a configuration, the relative shape in the first direction between each insertion portion and the insertion portion corresponding to the insertion portion when the power storage device is assembled, due to the tip shape of each insertion portion (the outer surface of each insertion portion). Since the misalignment is corrected, the assembly efficiency can be improved. That is, according to the above-described configuration, the relative position in the first direction between the pair of insertion portions and the pair of inserted portions corresponding to the pair of insertion portions at the time of assembling the power storage device or the like deviates from the expected relative position. However, if the tip of each insertion portion enters the insertion portion (open portion), the insertion portion is moved by the outer surface of one of the insertion portions by bringing the spacer and the opposing member closer in the second direction. Enter the corresponding inserted part.

In this case, in the power storage device,
Each of the inner side surfaces facing the direction approaching each other in the first direction of the pair of insertion portions is a transmission surface extending in the second direction,
Each of the pair of insertion parts is a transmission surface that faces the transmission surface of the corresponding insertion part in the first direction and defines a part of the opening, and enters the insertion part. It is preferable to have a transmitted surface to which a force is transmitted from the transmission surface by contact of the transmission surface of the insertion portion.

  According to this configuration, when acceleration in the stacking direction (including an acceleration component) occurs in the power storage device, the transmission surface of one of the pair of insertion portions and the insertion corresponding to the insertion portion The contact surface of the portion abuts (or abuts), so that a sufficient contact area between the insertion portion and the insertion portion is secured, whereby the insertion portion or the insertion portion is provided. The force (for example, inertial force) generated by the power storage element arranged on the acceleration direction side from the spacer can be reliably received by the facing member.

In the power storage device,
A pair of end plates sandwiching the plurality of power storage elements in the first direction;
A metal connecting member that connects the pair of end plates;
The opposing member is an insulating material disposed between the connecting member, the spacer, and the power storage element, and may be engaged with the connecting member.

  According to such a configuration, the power received by the opposing member (specifically, the power storage element disposed on the acceleration direction side from the spacer having the insertion portion or the inserted portion when acceleration in the first direction occurs in the power storage device) Force (e.g., inertial force) generated by the counter member can be received by the metal connecting member engaged with the opposing member, so that the force is applied to the power storage element disposed at the end portion in the first direction. It is possible to more reliably suppress the addition.

in this case,
The insertion portion may be opposed to the insertion portion that has entered the insertion portion in a first direction and a third direction orthogonal to the second direction.

  According to such a configuration, when the power storage device is disposed with the third direction along the vertical direction, the power storage device is disposed at an intermediate position among the plurality of power storage elements arranged in the first direction, and the insertion portion or the insertion target portion. Since a power storage element adjacent to the spacer having a gap is supported by a metal connecting member via an opposing member, a middle position of a row of power storage elements (a plurality of power storage elements arranged in the first direction) sandwiched between end plates Can be prevented from drooping downward.

  As described above, according to the present invention, even if a plurality of power storage elements arranged in the first direction are provided, the force caused by the acceleration applied to the power storage elements arranged at the end in the first direction when acceleration occurs. It is possible to provide a power storage device that can suppress the above.

FIG. 1 is a perspective view of the power storage device according to the present embodiment. FIG. 2 is an exploded perspective view of the power storage device. FIG. 3 is a perspective view of a power storage element disposed in the power storage device. FIG. 4 is an exploded perspective view of the power storage element. FIG. 5 is a perspective view for explaining an internal spacer in the power storage device. FIG. 6 is an enlarged perspective view for explaining a first restricting portion of the inner spacer. FIG. 7 is an enlarged perspective view for explaining a second restricting portion of the inner spacer. FIG. 8 is a perspective view for explaining an external spacer in the power storage device. FIG. 9 is an enlarged cross-sectional view of the first insulating portion of the insulator and its peripheral members. FIG. 10 is a schematic diagram for explaining a pair of insertion portions and a portion to be inserted corresponding to the pair of insertion portions. FIG. 11 is an enlarged cross-sectional view for explaining the inserted portion. FIG. 12 is a schematic diagram for explaining a method of eliminating the relative position shift between the insulator and the internal spacer in the X-axis direction, and is a schematic diagram showing a state before the insertion portion is inserted into the insertion portion. is there. FIG. 13 is a schematic diagram for explaining a method of eliminating the relative position shift in the X-axis direction between the insulator and the internal spacer, and shows a state in which one insertion portion is in contact with one insertion portion. It is a schematic diagram shown. FIG. 14 is a schematic diagram for explaining a method of eliminating the relative position shift between the insulator and the internal spacer in the X-axis direction, and a pair of inserted portions includes a pair corresponding to the pair of inserted portions. It is a schematic diagram of the state which inserted part of. FIG. 15 is a schematic diagram illustrating a pair of inserted portions when an acceleration in the X-axis direction is generated in the power storage device, and a pair of inserted portions corresponding to the pair of inserted portions. FIG. 16 is a schematic diagram illustrating an insertion portion according to another embodiment and a portion to be inserted into which the insertion portion is inserted. FIG. 17 is a schematic diagram illustrating an insertion portion according to another embodiment and a portion to be inserted into which the insertion portion is inserted. FIG. 18 is a view for explaining the inner peripheral surface of the inserted portion according to another embodiment.

  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 and 2, the power storage device includes a plurality of power storage elements 10 arranged in a predetermined direction (first direction), an internal spacer (spacer) 2A arranged between adjacent power storage elements 10, And an insulator (opposing member) 4 that is opposed to the inner spacer 2A in a direction (second direction) orthogonal to the predetermined direction and that is directly or indirectly fixed to the attachment target device. The power storage device 1 includes a pair of external spacers 2B disposed on both sides of the plurality of power storage elements 10 in the predetermined direction, a plurality of power storage elements 10, a plurality of internal spacers 2A, a pair of external spacers 2B, and an insulator. And a holding member 3 for holding 4 together. This holding member 3 is formed of a conductive member. For this reason, the insulator 4 is formed of an insulating material having an insulating property in order to insulate the power storage element 10 and the holding member 3. The power storage device 1 also includes a bus bar 5 that electrically connects two adjacent power storage elements 10 (specifically, external terminals 13 of the two adjacent power storage elements 10).

  As shown in FIGS. 3 and 4, the power storage element 10 includes an electrode body 11 including a positive electrode and a negative electrode, a case 12 that houses the electrode body 11, and a pair of external terminals 13 disposed on the outer surface of the case 12. With. The power storage element 10 also includes a current collector 14 that conducts the electrode body 11 and the external terminal 13, an insulating member 15 that is disposed between the electrode body 11 and the case 12, and the like.

  The case 12 includes a case main body 120 having an opening, and a cover plate 121 that closes the opening of the case main body 120, and a cover plate 121 on which the pair of external terminals 13 are disposed on the outer surface.

  The case main body 120 includes a rectangular plate-shaped blocking portion 123 and a flat rectangular tube-shaped body portion 124 connected to the periphery of the blocking portion 123 so as to surround the blocking portion 123.

  The body portion 124 includes a pair of first walls 125 that face each other with a space therebetween, and a pair of second walls 126 that face each other across the pair of first walls 125.

  Each of the first wall 125 and the second wall 126 is formed in a rectangular shape. The 1st wall 125 and the 2nd wall 126 are arrange | positioned in the state which faced each other's edge. And the edge of the adjacent 1st wall 125 and the edge of the 2nd wall 126 are connected over the full length. Thereby, the trunk | drum 124 is formed in a rectangular tube shape. One end of the body portion 124 is closed by the closing portion 123, and the other end is opened. This opening is closed by the cover plate 121.

  In the present embodiment, the length of the first wall 125 in the Y-axis direction is larger than the length of the second wall 126 in the X-axis direction. For this reason, the trunk | drum 124 is formed in a flat rectangular tube shape.

  In the power storage device 1 of the present embodiment, each of the plurality of power storage elements 10 is aligned with the first wall 125 of the case 12 facing the predetermined direction.

  In the following description, for the sake of convenience, the direction (first direction) in which the power storage elements 10 are aligned is defined as the X-axis direction in the orthogonal coordinate system. Further, one of the two axial directions orthogonal to the direction in which the storage elements 10 are aligned (X-axis direction) (the direction in which the insulator 4, the storage element 10 and the internal spacer 2A face each other: the second direction) is orthogonal. The Y-axis direction in the coordinate system is set, and the remaining one direction (third direction) is set as the Z-axis direction in the orthogonal coordinate system.

  Power storage device 1 has two types of spacers: an internal spacer 2A disposed between adjacent power storage elements 10 and an external spacer 2B adjacent to the endmost power storage element 10 among the plurality of power storage elements 10. . As described above, the power storage device 1 according to the present embodiment includes the plurality of power storage elements 10, and the internal spacers 2 </ b> A are disposed between the adjacent power storage elements 10. That is, the power storage device 1 of this embodiment includes a plurality of internal spacers 2A. In addition, the power storage device 1 of the present embodiment includes a pair of external spacers 2B that are disposed on both sides of the plurality of power storage elements 10 in the X-axis direction.

  As shown in FIGS. 2, 5 to 7, 9, and 10, the inner spacer 2 </ b> A is adjacent to the base 20 </ b> A adjacent to the electricity storage element 10 (the first wall 125 of the case body 120), and adjacent to the base 20 </ b> A. It has a restricting portion 21A that restricts (prevents) positional deviation (relative positional deviation) in the YZ plane (a plane including the Y-axis direction and the Z-axis direction) of the two power storage elements 10. The internal spacer 2A has an insertion portion 22A that protrudes in the Y-axis direction.

  The base 20 </ b> A is a portion that extends in the YZ plane direction and is sandwiched between the two power storage elements 10. The base 20 </ b> A is a first surface facing one of the two adjacent power storage elements 10 and a second surface opposite to the first surface. It has the 2nd surface facing the other electrical storage element 10 of them.

  The base 20 </ b> A is a first end at a position corresponding to the lid plate 121 of the power storage element 10 and a second end opposite to the first end, and is a second end at a position corresponding to the closing portion 123 of the power storage element 10. With two ends. The base 20A is a third end at a position corresponding to one second wall 126 in the Y-axis direction of the power storage element 10 and a fourth end opposite to the third end. And a fourth end at a position corresponding to the other second wall 126 in the Y-axis direction. The first end and the second end extend in the Y-axis direction, respectively, and the third end and the fourth end extend in the Z-axis direction, respectively.

  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. .

  The base 20A described above has a substantially rectangular shape when viewed in the X-axis direction, and is approximately the same size as the adjacent storage element 10. Base 20 </ b> A forms a ventilation path for allowing fluid (cooling fluid) to pass between adjacent power storage elements 10. Specifically, it is as follows.

  The cross-sectional shape of the base 20A in the XZ plane (plane including the X-axis direction and the Z-axis direction) is 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 storage elements 10 and the other storage element 10 of the two adjacent storage elements 10. It has a second contact portion 201A and a connecting portion 202A that connects the first contact portion 200A and the second contact portion 201A.

  The first abutting portion 200A is a rectangular plate-shaped portion that extends in the YZ direction and is long in the Y-axis direction. The second contact portion 201A is a rectangular plate-shaped portion that extends in the YZ direction and is long in the Y axis direction at a position displaced in the X axis direction from the first contact portion 200A. The base 20A has a plurality of first contact portions 200A and a plurality of second contact portions 201A. The first contact portions 200A and the second contact portions 201A are alternately arranged in the Z-axis direction. Each connecting portion 202A extends in the X-axis direction, and extends in the Z-axis direction of the first contact portion 200A in the Z-axis direction and the second contact portion 201A that faces the end portion in the X-axis direction. Connect the ends.

  The restricting portion 21A includes a power storage element 10 adjacent to the first surface of the base 20A from the base 20A in order to restrict relative movement along the YZ plane of the two power storage elements 10 adjacent to the inner spacer 2A. The base 20A extends toward the power storage element 10 adjacent to the second surface of the base 20A.

  This will be described more specifically. The restricting portion 21A is formed at a position including each corner on the periphery of the base 20A. The restricting portion 21A includes a first restricting portion 211A formed at the first corner portion of the base 20A, a second restricting portion 212A formed at the second corner portion of the base 20A, and the fourth triangular portion of the base 20A. And a third restricting portion 213A formed over the corner portion.

  211 A of 1st control parts are extended toward the electrical storage element 10 adjacent to the 1st surface of the base 20A, and the electrical storage element 10 adjacent to the 2nd surface of the base 20A, and the electrical storage element 10 arrange | positioned at the both sides of the base 20A. Each of the cover plates 121 and one second wall 126 of the body portion 124 abut against each other. Specifically, the first restricting portion 211A includes the first portion 2111A extending from the base 20A toward both sides in the X-axis direction so as to contact the cover plate 121, and the one side from the base 20A toward both sides in the X-axis direction. 2nd part 2112A extended so that it may contact | abut with the 2nd wall 126 of this (refer FIG. 6). Each of the first part 2111A and the second part 2112A of the present embodiment is plate-shaped. Thereby, the cross-sectional shape in the YZ plane direction in the first restricting portion 211A is L-shaped.

  212 A of 2nd control parts are extended toward the electrical storage element 10 adjacent to the 1st surface of the base 20A, and the electrical storage element 10 adjacent to the 2nd surface of the base 20A, and the electrical storage element 10 arrange | positioned at the both sides of the base 20A. Each of the cover plates 121 and the other second wall 126 of the body portion 124 abut against each other. Specifically, the second restricting portion 212A includes a first portion 2121A extending from the base 20A toward both sides in the X axis direction so as to contact the lid plate 121, and the other side from the base 20A toward both sides in the X axis direction. 2nd part 2122A extended so that it may contact | abut with the 2nd wall 126 of this (refer FIG. 7). Each of the first part 2121A and the second part 2122A of the present embodiment is plate-shaped. Thereby, the cross-sectional shape of YZ plane direction in the 2nd control part 212A becomes L shape similarly to the 1st control part 211A.

  The third restricting portion 213A extends toward the power storage element 10 adjacent to the first surface of the base 20A and the power storage element 10 adjacent to the second surface of the base 20A, and is connected to the power storage elements 10 disposed on both sides of the base 20A. The closed portion 123 and the second wall 126 of the trunk portion 124 are in contact with each other. That is, the third restricting portion 213A extends from one second wall 126 to the other second wall 126 through the closing portion 123 along the end portion on the closing portion 123 side of the power storage element 10 disposed on both sides of the base 20A. Extends continuously.

  The insertion portion 22 </ b> A enters a part of the insulator 4. The insertion portion 22A extends from the first restricting portion 211A and the second restricting portion 212A (specifically, the second portions 2112A and 2122A) toward the outside in the Y-axis direction (on the opposite side to the power storage element 10). A pair of insertion portions 22A of the present embodiment is provided at different positions in the X-axis direction in one second portion 2112A, 2122A. Each of the outer surfaces 220A facing away from each other in the X-axis direction of the pair of insertion portions 22A approaches each other from the proximal end side (second portion 2112A, 2122A side) toward the distal end. On the other hand, each of the inner side surfaces 221A facing in a direction approaching each other in the X-axis direction of the pair of insertion portions 22A extends in the Y-axis direction. Details are as follows. In the following, the insertion portion 22A on one side in the X-axis direction (the front side in FIGS. 6 and 7) is the first insertion portion 23A, and the insertion portion 22A on the other side (the rear side in FIGS. 6 and 7) is the first. Sometimes referred to as two insertion portions 24A.

  Each of the pair of insertion portions 22A (the first insertion portion 23A and the second insertion portion 24A) is disposed at a position different from each other in the X-axis direction and in the Z-axis direction at the common (one) second portion 2112A, 2122A. Has been. Each insertion portion 22A has a shape in which a tip end of a cylinder having the Y-axis direction as a central axis is notched so as to be inclined with respect to the Y-axis direction and facing the X-axis direction. This inclined surface is the outer surface 220A. On the other hand, the surface (inner surface) 221A opposite to the outer surface 220A in the X-axis direction is in the X-axis direction generated in the inner spacer 2A by coming into contact with the inserted portion 45 in a state of entering the inserted portion 45. Force (including the component of the force in the X-axis direction) and the force in the X direction (including the component of the force in the X-axis direction) applied to the internal spacer 2A from the adjacent storage element 10 or the like are transmitted to the insulator 4. . That is, the inner side surface 221A of the present embodiment constitutes a transmission surface.

  As shown in FIG. 8, the outer spacer 2B includes a base 20B having a first surface facing the power storage element 10 (the first wall 125 of the case body 120) and a second surface opposite to the first surface. The base 20B and a regulating portion 21B that regulates the positional deviation in the YZ plane direction of the electricity storage element 10 adjacent to the base 20B.

  In addition, the base 20 </ b> B of the present embodiment faces the terminal member 30 of the holding member 3. That is, the external spacer 2 </ b> B of the present embodiment is disposed between the power storage element 10 and the termination member 30.

  The outer spacer 2 </ b> B has a first protruding portion 24 </ b> B that protrudes from the second surface of the base 20 </ b> B toward the terminal member 30 and contacts the terminal member 30. The outer spacer 2 </ b> B has a second protruding portion 201 </ b> B that protrudes from the first surface of the base 20 </ b> B toward the power storage element 10 and contacts the power storage element 10.

  The base 20B is formed in a plate shape spreading in the YZ plane direction. The base 20 </ b> B is a first end disposed at a position corresponding to the cover plate 121 of the power storage element 10, and a second end opposite to the first end, and corresponds to the closing portion 123 of the power storage element 10. And a second end disposed at the position. The base 20B is a third end disposed at a position corresponding to one second wall 126 of the power storage element 10 and a fourth end opposite to the third end, and the other end of the power storage element 10 And a fourth end disposed at a position corresponding to the second wall 126.

  The base 20B has a first corner portion that is a portion where the first end and the third end are connected, and a second corner portion that is a portion where the first end and the fourth end are connected. In addition, the base 20B has a third triangular portion which is a portion where the second end and the third end are connected, and a fourth corner portion which is a portion where the second end and the fourth end are connected. .

  The first end and the second end of the base 20B extend in the Y-axis direction, and the third end and the fourth end extend in the Z-axis direction, respectively. Thereby, the base 20B has a substantially rectangular shape when viewed in the X-axis direction. The base 20 </ b> B is approximately the same size as the power storage element 10.

  A ventilation path for allowing fluid to pass between the first surface of the base 20B and the power storage element 10 is formed on the first surface of the base 20B. Details are as follows.

  As described above, the base 20B has the second protrusion 201B that extends from the first surface of the base 20B toward the case 12 (the first wall 125 of the case main body 120) of the power storage element 10 adjacent to the base 20B. .

  The second protrusion 201B is a ridge extending in the Y-axis direction. The base 20B of the present embodiment has a plurality of second protrusions 201B. And each of several 2nd protrusion part 201B is arrange | positioned at intervals in the Z-axis direction. Thereby, the above-mentioned ventilation path (not numbered) is formed between the base 20B and the power storage element 10 adjacent to the base 20B.

  The restricting portion 21B extends toward the adjacent storage element 10 in order to restrict the relative movement of the base 20B and the storage element 10 adjacent to the first surface of the base 20B in the YZ plane direction.

  More specifically, the restricting portion 21B includes a first restricting portion 211B formed at the first corner portion, a second restricting portion 212B formed at the second corner portion, and the fourth to fourth corners of the base 20B. And a third restricting portion 213B formed over the portion.

  The 1st control part 211B and the 2nd control part 212B are each extended toward the electrical storage element 10 adjacent to the 1st surface of the base 20B. The first restricting portion 211B is in contact with the cover plate 121 of the electricity storage device 10 adjacent to the first surface of the base 20B and one second wall 126 of the trunk portion 124. The second restricting portion 212 </ b> B comes into contact with the cover plate 121 of the electricity storage device 10 adjacent to the first surface of the base 20 </ b> B and the other second wall 126 of the trunk portion 124.

  Third restricting portion 213B extends toward power storage element 10 adjacent to base 20B. The third restricting portion 213B abuts on the closing portion 123 of the power storage element 10 disposed next to the base 20B and each second wall 126 of the trunk portion 124. That is, the third restricting portion 213B has one second wall along the end on the closing portion 123 side of the electric storage element 10 arranged next to the base 20B, like the third restricting portion 213A of the inner spacer 2A. It extends continuously from 126 to the other second wall 126 through the closing portion 123.

  As described above, the first protrusion 24 </ b> B protrudes from the base 20 </ b> B toward the termination member 30 and is in contact with the termination member 30. Thereby, in the power storage device 1, a gap is formed between the external spacer 2 </ b> B and the termination member 30.

  The outer spacer 2B described above is adjacent to the inner spacer 2A through the power storage element 10.

  The holding member 3 is made of metal. As shown in FIGS. 1 and 2, the holding member 3 includes a pair of terminal members 30 that sandwich the plurality of power storage elements 10 in the X-axis direction, and a pair of frames (connecting members) 31 that connect the pair of terminal members 30. With. The holding member 3 of the present embodiment is a part that is fixed to the target device when the power storage device 1 is arranged in a target device to be attached such as a battery pack (a power supply device including a plurality of power storage devices 1). is there.

  Each of the pair of termination members 30 has a first surface facing the outer spacer 2B and a second surface opposite to the first surface. Each of the pair of termination members 30 has a pressure contact portion 300 that abuts on a first protrusion 24B extending from the base 20B of the outer spacer 2B.

  Termination member 30 is a first end disposed at a position corresponding to cover plate 121 of power storage element 10, and a second end opposite to the first end, and corresponds to closing portion 123 of power storage element 10. And a second end disposed at the position to be. The terminating member 30 is a third end disposed at a position corresponding to the one second wall 126 of the power storage element 10 and a fourth end opposite to the third end, It has the 4th end arrange | positioned in the position corresponding to the other 2nd wall 126. FIG.

  Accordingly, the termination member 30 includes a first corner portion that is a portion where the first end and the third end are connected, and a second corner portion that is a portion where the first end and the fourth end are connected. Have Moreover, the termination | terminus member 30 has the 4th triangle part which is a part to which each of a 2nd end and a 4th end is connected, and the 4th triangle part which is a part to which a 2nd end and a 3rd end are connected. Have.

  Each frame 31 has a first connection part 310 extending so as to connect the pair of terminal members 30 and a second connection extending so as to connect the pair of terminal members 30 at positions different from the first connection part 310 in the Z-axis direction. Part 311. First connection portion 310 extends in the X-axis direction and is disposed at a position corresponding to lid plate 121 of power storage element 10 in the Z-axis direction. The second connection portion 311 extends in the X-axis direction and is disposed at a position corresponding to the closing portion 123 of the storage element 10 in the Z-axis direction.

  The frame 31 includes a pair of support portions 312 that extend in the Z-axis direction and connect the end portions of the first connection portion 310 and the second connection portion 311. The frame 31 of this embodiment also has a reinforcing portion 313 that extends in the Z-axis direction and connects intermediate portions of the first connection portion 310 and the second connection portion 311.

  As described above, the frame 31 according to this embodiment is formed in a frame shape by connecting the end portions of the first connection portion 310 and the second connection portion 311 to each other with the support portion 312. The frame 31 is disposed at a position adjacent to the electricity storage element 10 on one side in the Y-axis direction and a position adjacent to the other side.

  The insulator 4 is disposed between the plurality of power storage elements 10 and the plurality of internal spacers 2A arranged in the X-axis direction and the frame 31 (holding member 3). The insulator 4 is formed with a groove along the frame 31, and is engaged with the frame 31 by fitting the frame 31 into the groove (see FIG. 9). The insulator 4 is fixed to the target device by the holding member 3 including the frame 31 being fixed to the target device to be attached. That is, the insulator 4 is fixed indirectly (specifically, via the holding member 3) to the target device to be attached.

  Specifically, the insulator 4 extends in the X-axis direction and extends in the X-axis direction and is connected to the first insulating portion 41 disposed between the first connection portion 310 and the power storage element 10 and the internal spacer 2A. A second insulating portion 42 disposed between the portion 311 and the power storage element 10 and the inner spacer 2A. The insulator 4 includes a pair of third insulating portions 43 that extend in the Z-axis direction and connect the first insulating portion 41 and the second insulating portion 42. Each of the pair of third insulating portions 43 is disposed between the support portion 312 of the frame 31 and at least one of the power storage element 10 and the external spacer 2B. Furthermore, the insulator 4 has a fourth insulating portion 44 that extends in the Z-axis direction and connects intermediate portions of the first insulating portion 41 and the second insulating portion 42. The fourth insulating portion 44 is disposed between the reinforcing portion 313 of the frame 31 and at least one of the power storage element 10 and the internal spacer 2A.

  The first insulating portion 41 has an insertion portion 45 into which a part of the inner spacer 2A (in the example of this embodiment, the insertion portion 22A) enters (inserts).

  As shown in FIGS. 9 to 11, the inserted portion 45 defines an open portion 450 that opens in the direction in which the insertion portion 22A enters (see FIG. 11), and the insertion portion 22A enters. The inserted portion 45 of the present embodiment is a recessed portion that is recessed in the Y-axis direction and is formed in a portion (surface) facing the second portion 2112A, 2122A in the first insulating portion 41, and the opening portion 450 is the recessed portion ( It is defined by an inner surface (hereinafter referred to as “concave inner surface”) 451 of the insertion portion 45). The inserted portion 45 of the present embodiment is a concave portion having an inner circumferential surface 452 having an oval shape (so-called racetrack type) that is long in the X-axis direction when viewed in the Y-axis direction. The outer dimension S1 of the insertion portion 22A is larger than the inner dimension of the inserted portion 45 in the X-axis direction (that is, the opening dimension of the opening portion 450 in the X-axis direction: the inner dimension of the inner circumferential surface 452 in the major axis direction) S2. small. That is, in the X-axis direction, a gap is formed between at least one of the one end portion (end surface) and the other end portion (end surface) of the inner peripheral surface 452 and the insertion portion 22A. . The inserted portion 45 (specifically, the inner peripheral surface 452) faces the insertion portion 22A that has entered the inserted portion 45 in the Z-axis direction. Note that the outer dimension S1 of the insertion portion 22A of the present embodiment is an outer dimension at a cylindrical portion on the base side from the outer surface 220A, and the inner dimension S2 of the insertion portion 45 is in the major axis direction of the inner peripheral surface 452. It is inside size.

  A pair of inserted portions 45 is provided corresponding to each of the pair of insertion portions 22A. Hereinafter, the insertion portion 45 into which the first insertion portion 23A is inserted may be referred to as a first insertion portion 45A, and the insertion portion 45 into which the second insertion portion 24A is inserted is referred to as a second insertion portion 45B. .

  Each inserted portion 45 has a corresponding portion in the X-axis direction with a corresponding inserting portion (specifically, an inserting portion inserted into the inserted portion 45) 22A. This part is a transmitted surface 453 included in the inner peripheral surface 452. Specifically, the transmitted surface 453 is opposed to the inner surface (transmission surface) 221A of the insertion portion 22A in the X-axis direction and defines a part of the opening portion 450. The transmitted surface 453 of this embodiment is a surface parallel to the inner surface 221A of the insertion portion 22A. The transmitted surface 453 is a portion (surface) to which a force is transmitted from the inner surface 221A by the contact of the inner surface 221A of the insertion portion 22A that has entered the inserted portion 45.

  The transmitted surface 453 and the inner surface (transmission surface) 221A face each other with a predetermined interval (the above-described gap) in the X-axis direction (see FIG. 10). This predetermined interval is the largest, and is the difference between S2 and S1. And this predetermined space | interval is the movement of the electrical storage element 10 and the internal spacer 2A in the X-axis direction when the acceleration in the X-axis direction (including the acceleration component in the X-axis direction) occurs in the electrical storage device 1 (see FIG. 15). ) Is preferably set within an allowable range. That is, it is preferable that the range in which the movement is allowed is set to a range in which the power storage element 10 disposed at the end in the X-axis direction is not damaged by the movement. The difference between S2 and S1 is preferably 2 mm or less. Further, the difference between S2 and S1 is preferably 0.1 mm or more, and more preferably 0.5 mm or more.

  According to the power storage device 1 described above, when acceleration in the X-axis direction (including an acceleration component) occurs in the power storage device 1, the insertion portion 45 and the insertion portion 22 </ b> A entering the insertion portion 45 are By abutting (or abutting) in the X-axis direction, a force (for example, inertial force) generated by the power storage element 10 arranged on the acceleration direction side from the inner spacer 2A having the inserted portion 45 is applied to the insulator 4. Can be received. Thereby, the force (force resulting from the said acceleration) added to the electrical storage element 10 arrange | positioned at the edge part of a X-axis direction can be suppressed.

  Moreover, the outer dimension of the insertion portion 22A is smaller than the opening dimension of the opening portion (opening portion defined by the inner surface 451 of the insertion portion 45) 450 in the X-axis direction. For this reason, when the power storage device 1 is assembled, the relative position in the X-axis direction between the insertion portion 22A and the insertion portion 45 due to expansion, contraction, or the like of the power storage element 10 deviates from the expected relative position (design value, etc.). Even in this case, the insertion portion 22A can be inserted into the insertion portion 45.

In the power storage device 1 of the present embodiment, the outer surfaces 220A that face away from each other in the X-axis direction of the pair of insertion portions 22A approach each other from the proximal end toward the distal end. According to such a distal end shape of the insertion portion 22A (the outer side surface 220A of each insertion portion 22A), as shown in FIGS. 12 to 14, when the power storage device 1 is assembled, each insertion portion 22A and the insertion portion The deviation of the relative position in the X-axis direction with the inserted portion 45 corresponding to 22A is corrected. Thereby, assembly efficiency can be improved. That is, when the power storage device 1 is assembled, the relative position in the X-axis direction between the pair of insertion portions 22A and the pair of inserted portions 45 corresponding to the pair of insertion portions 22A is deviated from the intended relative position. (See FIG. 12), if the distal end of each insertion portion 22A enters the insertion portion 45 (opening portion 450) (see FIG. 13), the outer side surface 220A of the insertion portion 22A abuts the periphery of the insertion portion 45. By moving the inner spacer 2A and the insulator 4 closer to each other in the Y-axis direction in the state, the inner spacer 2A and the insulator 4 move relatively in the X-axis direction (relatively move in a direction to eliminate the deviation: arrow in FIG. 13 α). As described above, the shift is eliminated by the outer side surface 220A of the insertion portion 22A, and as a result, each insertion portion 22A enters the corresponding insertion portion 45 (see FIG. 14).
12 to 14 show that the outer side surface 220A of the first insertion portion 23A comes into contact with the edge of the first insertion portion 45A from the state in which the inner spacer 2A is displaced toward the first insertion portion 23A. Although the deviation is eliminated, the inner spacer 2A may be displaced to the opposite side. That is, even if the inner spacer 2A is displaced to the opposite side (second insertion portion 24A side), the displacement is eliminated by the outer surface 220A of the second insertion portion 24A coming into contact with the edge of the second insertion portion 45B. Can do.

  Further, in the power storage device 1 of the present embodiment, the inner side surfaces 221A of the pair of insertion portions 22A that face each other in the X-axis direction are transmission surfaces that extend in the Y-axis direction. Each has a transmitted surface 453 that faces the inner side surface 221A of the corresponding insertion portion 22A in the X-axis direction and defines a part of the opening portion 450. For this reason, as shown in FIG. 15, the acceleration toward one side in the X-axis direction (the first insertion portion 23A side in the example shown in FIG. 15) (that is, the second insertion portion 24A side in FIG. 15). Of the inner surface (transmission surface) 221A of one insertion portion 22A (first insertion portion 23A in the example shown in FIG. 15) and the insertion portion 22A. The contacted surface 453 of the inserted portion 45 (first inserted portion 45A in the example shown in FIG. 15) contacts (or contacts). As a result, a sufficient contact area between the insertion portion 22A and the insertion portion 45 is ensured, and as a result, a force generated by the power storage element 10 disposed on the acceleration direction side from the internal spacer 2A having the insertion portion 45 ( For example, the inertia force) can be reliably received by the insulator 4. Similarly, when acceleration toward the other side in the X-axis direction (the second insertion portion 24A side in the example shown in FIG. 15) occurs, it is similarly arranged on the acceleration direction side from the internal spacer 2A having the insertion portion 45. The power generated by the storage element 10 (for example, inertial force) can be reliably received by the insulator 4.

  In the power storage device 1 of the present embodiment, the insulator 4 is engaged with the metal frame 31. As a result, the force received by the insulator 4 (specifically, by the power storage element 10 disposed on the acceleration direction side of the internal spacer 2A having the inserted portion 45 when acceleration in the X-axis direction occurs in the power storage device 1). The generated force (for example, inertial force) can be received by the metal frame 31 with which the insulator 4 is engaged. As a result, it is possible to more reliably suppress the force from being applied to the power storage element 10 disposed at the end of the power storage device 1 in the X-axis direction.

  Further, in the power storage device 1 of the present embodiment, the insertion portion 45 (inner peripheral surface 452) faces the insertion portion 22A that has entered the insertion portion 45 in the Z-axis direction. For this reason, when the power storage device 1 is disposed with the Z-axis direction along the vertical direction, the internal spacer is disposed in the middle of the plurality of power storage elements 10 arranged in the X-axis direction and has the insertion portion 22A. The power storage element 10 adjacent to 2A is supported by a metal frame 31 via the insulator 4. Thereby, it is possible to suppress the downward sag of the intermediate position of the row of the storage elements 10 (the plurality of storage elements 10 arranged in the X-axis direction) sandwiched between the termination members 30.

  The power storage device of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention. For example, the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of an embodiment can be deleted.

  In the power storage device 1 of the above embodiment, the inner spacer 2A has the insertion portion 22A and the insulator 4 has the inserted portion 45, but the configuration is not limited thereto. For example, the inner spacer 2A may have the insertion portion 45, and the insulator 4 may have the insertion portion 22A.

  In the power storage device 1 of the above embodiment, the pair of insertion portions 22A is provided in the inner spacer 2A, and the pair of inserted portions 45 corresponding to the pair of insertion portions 22A is provided in the insulator 4. It is not limited to the configuration. One insertion portion 22A of the pair of insertion portions 22A may be provided in the inner spacer 2A, and the other insertion portion 22A may be provided at a position different from the one insertion portion 22A in the insulator 4 in the X-axis direction. That is, the insertion portion 22A and the insertion portion 45 are provided at different positions in the X-axis direction in the inner spacer 2A, and the insertion portion 45 into which the insertion portion 22A of the inner spacer 2A enters the insulator 4 and the insertion of the inner spacer 2A. An insertion portion 22A that enters the portion 45 may be provided.

  Further, in the power storage device 1 of the above embodiment, when acceleration in the X-axis direction is generated in the power storage device 1 by the pair of insertion portions 22A and the pair of inserted portions 45 corresponding to the pair of insertion portions 22A, Although the insulator 4 receives the force (for example, inertial force) generated by the power storage element 10 disposed on the acceleration direction side of the internal spacer 2A having the insertion portion 22A, the configuration is not limited to this.

  For example, as illustrated in FIG. 16, the power storage device 1 may be configured such that the insertion portion 22 </ b> A is a single convex portion, and the inserted portion 45 is inserted with the convex portion. In this case, in the insertion portion 22A, both surfaces in the X-axis direction of the base end portion include the transmission surface 221A, both surfaces in the X-axis direction of the distal end portion of the insertion portion 22A are continuous with the transmission surface 221A, and the insertion portion 22A The outer surface 220A may be closer to each other from the base end side of the portion 22A toward the tip end. According to such a configuration, even when the relative position in the X-axis direction between the insertion portion 22A and the insertion target portion 45 is deviated from a planned relative position such as a design value when the power storage device 1 is assembled, the insertion portion If the tip of the (convex portion) 22A enters the inserted portion 45 (open portion 450), the inner spacer 2A and the insulator 4 are moved closer to each other in the Y-axis direction, so that both surfaces of the insertion portion (convex portion) 22A (in detail) The insertion portion (convex portion) 22A is guided into the insertion portion 45 (opening portion 450) by both outer side surfaces) 220A. As described above, according to the configuration described above, the displacement of the relative position between the insertion portion 22A and the insertion portion 45 in the X-axis direction is corrected by the tip shape (both sides 220A) of the insertion portion 22A when the power storage device 1 is assembled. While improving the assembly efficiency, when the X-axis direction acceleration occurs in the power storage device 1 due to the transmission surface 221A continuous to the both surfaces 220A and the transmission surface 453 of the insertion portion 45, the insertion portion 22A or insertion target A contact area that allows the insulator 4 to receive a force generated by the electric storage element 10 arranged on the acceleration direction side of the internal spacer 2A having the portion 45 (inserted portion 45 in the example of the above embodiment) can be secured.

  Further, in the power storage device 1, as illustrated in FIG. 17, the insertion portion 22A has two convex portions 25A that are arranged in the X-axis direction and enter the common inserted portion 45, and the X-axis of the two convex portions 25A. Each of the outer surfaces facing away from each other in the direction may include the transmission surface 221A. Even with such a configuration, when acceleration in the X-axis direction occurs in the power storage device 1, the insertion portion 45 and the insertion portion 22A (specifically, one of the two convex portions 25A) entering the insertion portion 45 are also provided. Is abutting (or abutting) in the X-axis direction, thereby generating a force (for example, inertial force) generated by the power storage element 10 disposed on the acceleration direction side of the inner spacer 2A having the inserted portion 45. The insulator 4 can be received.

  In this case, each of the two convex portions 25A has a transmission surface 221A at the base end portion, and outer surfaces 220A facing away from each other in the X-axis direction of the distal end portions of the two convex portions 25A are respectively connected to the transmission surface 221A. A configuration that is continuous and approaches each other from the proximal end side to the distal end side of the convex portion 25A is preferable. According to such a configuration, even when the relative position in the X-axis direction between the insertion portion 22A and the insertion portion 45 is deviated from the expected relative position when the power storage device 1 is assembled, the tip of each convex portion 25A Is inserted into the inserted portion 45 (open portion 450), the inner spacer 2A and the insulator 4 are moved closer to each other in the Y-axis direction so that the insertion portion 22A (two protrusions) is formed by the outer surface 220A of one of the protrusions 25A. The portion 25A) is guided into the insertion portion 45 (opening portion 450). As described above, according to the above configuration, due to the distal end shape of the insertion portion 22A (each outer surface 220A of the two convex portions 25A), when the power storage device 1 is assembled, the insertion portion 22A and the insertion portion 45 in the X-axis direction. The power transmission device 1 is accelerated in the X-axis direction by the transmission surface 221A continuous to the both surfaces 220A and the transmission surface 453 of the inserted portion 45, while correcting the relative position deviation and improving the assembly efficiency. It is possible to secure a contact area that causes the insulator 4 to receive a force generated by the power storage element 10 disposed on the acceleration direction side of the internal spacer 2A having the inserted portion 45 when the contact is made.

  In the power storage device 1 according to the above embodiment, the insertion portion 22A and the insertion portion 45 are provided in the first restriction portion 211A and the second restriction portion 212A of the inner spacer 2A and the first insulating portion 41 of the insulator 4. However, it is not limited to this configuration. For example, the insertion portion 22A and the insertion portion 45 may be provided in the third restriction portion 213A of the inner spacer 2A and the second insulating portion 42 of the insulator 4.

  In the power storage device 1 of the above embodiment, the insertion portion 22A (convex portion 25A) protrudes in the Y-axis direction, and the opening portion 450 opens in the insertion direction of the insertion portion 22A (convex portion 25A) protruding in the Y-axis direction. However, it is not limited to this configuration. For example, the insertion portion 22A (convex portion 25A) may protrude in the Z-axis direction, and the opening portion 450 may be open in the direction in which the insertion portion 22A (convex portion 25A) protruding in the Z-axis direction enters.

  In the power storage device 1 of the above embodiment, the insertion portion 22A has the outer surface 220A that is inclined with respect to the Y-axis direction, but may have a configuration without the outer surface 220A. That is, the insertion portion 22A may be columnar.

  The specific shape of the insertion portion 45 is not limited. For example, the inserted portion 45 of the above embodiment is a recess provided in the insulator 4, but may be a through hole. Moreover, although the inner peripheral surface 452 of the insertion part 45 of the said embodiment is an elliptical cylindrical shape (closed in the circumferential direction), as shown in FIG. 18, a part of circumferential direction is open | released. May be. That is, the inserted portion 45 only needs to have a configuration in which the inner dimension S2 in the X-axis direction is larger than the outer dimension S1 of the inserting portion 22A and includes the transmitted surface 453.

  In the power storage device 1 of the above-described embodiment, the insulator 4 is fixed to an attachment target device or the like via the holding member 3, but is not limited to this configuration. The insulator 4 may be directly fixed to an attachment target device or the like.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 10 ... Power storage element, 11 ... Electrode body, 12 ... Case, 120 ... Case main body, 121 ... Cover plate, 123 ... Closure part, 124 ... Trunk part, 125 ... First wall, 126 ... Second wall , 13 ... external terminal, 14 ... current collector, 15 ... insulating member, 2A ... internal spacer, 20A ... base, 200A ... first contact part, 201A ... second contact part, 202A ... connection part, 21A ... regulation Part 211A ... first restriction part 2111A ... first part 2112A ... second part 212A ... second restriction part 2121A ... first part 2122A ... second part 213A ... third restriction part 22A ... insertion Part, 220A ... outer side surface, 221A ... inner side surface (transmission surface), 23A ... first insertion part, 24A ... second insertion part, 25A ... convex part, 2B ... external spacer, 20B ... base, 201B ... second protrusion part , 21B ... restriction part, 211B First restricting portion, 212B ... second restricting portion, 213B ... third restricting portion, 24B ... first projecting portion, 3 ... holding member, 30 ... terminal member, 300 ... pressing portion, 31 ... frame, 310 ... first connection 311 ... second connection part 312 ... support part 313 ... reinforcement part 4 ... insulator 41 ... first insulation part 42 ... second insulation part 43 ... third insulation part 44 ... fourth insulation part 45 ... inserted portion, 45A ... first inserted portion, 45B ... second inserted portion, 450 ... open portion, 451 ... inner surface, 452 ... inner peripheral surface, 453 ... transmitted surface, 5 ... bus bar, S1 ... External dimension of the insertion part, S2 ... Internal dimension of the inserted part (open dimension)

Claims (6)

A plurality of power storage elements arranged in a first direction;
At least one spacer disposed between adjacent power storage elements;
An opposing member that opposes the spacer in a second direction orthogonal to the first direction and that is directly or indirectly fixed to an attachment target device,
At least one of the spacer and the facing member has an insertion portion protruding in the second direction,
At least the other of the spacer and the opposing member has at least one insertion portion that defines an opening portion that opens in a direction in which the insertion portion enters and the insertion portion enters,
The insertion part is a single convex part,
The convex portion has a transmission surface facing the first direction,
External dimension in a first direction of the protrusions, rather smaller than the opening dimension in a first direction of the opening portion,
Each of both surfaces in the first direction of the base end portion of the convex portion includes the transmission surface,
Both surfaces in the first direction of the front end of the convex part are continuous with the transmission surface and approach each other from the base end side of the convex part toward the front end,
The insertion portion is a transmission surface that faces the transmission surface in a first direction and defines a part of the open portion, and the convex portion that has entered the insertion portion contacts the transmission surface. A power storage device having a transmitted surface to which force is transmitted from the transmission surface . A plurality of power storage elements arranged in a first direction;
At least one spacer disposed between adjacent power storage elements;
An opposing member that opposes the spacer in a second direction orthogonal to the first direction and that is directly or indirectly fixed to an attachment target device,
At least one of the spacer and the facing member has an insertion portion protruding in the second direction,
At least the other of the spacer and the opposing member has at least one insertion portion that defines an opening portion that opens in a direction in which the insertion portion enters and the insertion portion enters,
The insertion portion has two convex portions that are aligned in the first direction and enter the common inserted portion,
The two convex portions have a transmission surface facing the first direction,
The outer dimension in the first direction of the two convex parts is smaller than the opening dimension in the first direction of the opening part,
Each of the outer surfaces facing away from each other in the first direction of the base end portions of the two convex portions includes the transmission surface,
Outer surfaces facing in directions away from each other in the first direction of the distal ends of the two convex portions are continuous with the transmission surface and approach each other as they go from the proximal end side of the convex portion to the distal end,
The insertion portion is a transmission surface that faces the transmission surface in a first direction and defines a part of the open portion, and the insertion surface of the two convex portions that have entered the insertion portion. A power storage device having a transmitted surface to which a force is transmitted from the transmission surface by contact . A plurality of power storage elements arranged in a first direction;
At least one spacer disposed between adjacent power storage elements;
An opposing member that opposes the spacer in a second direction orthogonal to the first direction and that is directly or indirectly fixed to an attachment target device,
At least one of the spacer and the facing member has an insertion portion protruding in the second direction,
At least the other of the spacer and the opposing member has at least one inserted portion that defines an open portion that opens in a direction in which the insertion portion enters and the insertion portion enters,
Each of the insertion portion and the insertion target portion has a portion facing in the first direction,
External dimension in a first direction of the insert, rather smaller than the opening dimension in a first direction of the opening portion,
A pair of the insertion portions are provided at different positions in the first direction,
A pair of the inserted portions are provided corresponding to the insertion portions,
Each of the outer surfaces facing in directions away from each other in the first direction of the pair of insertion portions are closer to each other as they go from the base end side to the tip end . Each of the inner side surfaces facing the direction approaching each other in the first direction of the pair of insertion portions is a transmission surface extending in the second direction,
Each of the pair of insertion parts is a transmission surface that faces the transmission surface of the corresponding insertion part in the first direction and defines a part of the open part, and enters the insertion part. The power storage device according to claim 3 , further comprising a transmitted surface that transmits a force from the transmission surface by contact of the transmission surface of the insertion portion. A plurality of power storage elements arranged in a first direction;
At least one spacer disposed between adjacent power storage elements;
A facing member that faces the spacer in a second direction orthogonal to the first direction and is directly or indirectly fixed to a target device to be attached;
A pair of end plates sandwiching the plurality of power storage elements in the first direction;
A metal connecting member that connects the pair of end plates;
The opposing member is an insulating material disposed between the connecting member, the spacer, and the power storage element, and engages with the connecting member;
At least one of the spacer and the facing member has an insertion portion protruding in the second direction,
At least the other of the spacer and the opposing member has at least one inserted portion that defines an open portion that opens in a direction in which the insertion portion enters and the insertion portion enters,
Each of the insertion portion and the insertion target portion has a portion facing in the first direction,
The electrical storage device, wherein an outer dimension in the first direction of the insertion part is smaller than an opening dimension in the first direction of the opening part. The power storage device according to claim 5 , wherein the inserted portion is opposed to the inserting portion that has entered the inserted portion in a third direction orthogonal to the first direction and the second direction.

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