JP6488165B2 - Power storage device and method for manufacturing power storage device - Google Patents

Description

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

  Conventionally, a collective battery including a plurality of single cells is known (see Patent Document 1). The assembled battery includes a plurality of unit cells arranged in a predetermined direction (first direction), a pair of end plates sandwiching the plurality of unit cells from the first direction, and the pair of end plates extending in the first direction. And a restraining band that connects the two. The end plate includes a plate body that extends in a direction perpendicular to the first direction, and a connection piece that extends from the periphery of the plate body toward the opposite side of the unit cell in the first direction. An end portion of the restraining band overlaps with the connection piece and is joined to the connection piece by a self-piercing rivet. Thus, the plurality of single cells are integrally held by the pair of end plates and the restraining band.

  The collective battery configured as described above is mounted (arranged) in, for example, an automobile, industrial equipment, or the like and used as a power source.

  In recent years, it has been desired to reduce the size and weight of an assembled battery because of restrictions on the location of the power storage device mounted (arranged) in the automobile, industrial equipment, and the like.

JP-A-11-120969

  Accordingly, an object of the present invention is to provide a power storage device that is reduced in size and weight, and a method for manufacturing the power storage device.

The power storage device according to the present invention includes:
At least one power storage element;
A termination member adjacent to the arrangement region of the power storage element in the first direction,
A frame connected to the termination member,
The termination member has a termination member main body that extends in a direction orthogonal to the first direction, and extends from the peripheral edge of the termination member main body, and on the opposite side to the power storage element so as to overlap the termination member main body in the first direction. A folded piece that is folded,
The frame includes a frame body extending in the first direction along the power storage element, and a joining piece extending along the terminal member body so as to overlap the folded piece from an end of the frame body.
The folded piece and the joining piece are joined to each other by clinch joining.

  According to this configuration, since the joining piece is joined (connected) to the folded piece that is folded back so as to overlap the termination member main body in the first direction, the joining portion between the frame and the termination member is terminated. Compared with the structure which protruded from the member main body to the 1st direction, it can reduce in size. Moreover, since the joining between the terminal member and the frame (specifically, the joining between the folded piece and the joining piece) is performed by clinch joining (joining by mechanical clinch), a connecting member such as a bolt or a self-piercing rivet is used. The power storage device can be reduced in weight compared to the case where the end member and the frame are connected (joined).

In the power storage device,
A pair of the termination members are provided so as to be arranged on both sides of the arrangement region in the first direction,
The frame connects the end members to each other,
The joining pieces are preferably provided at both ends of the frame body.

  According to such a configuration, since the pair of joining pieces provided at both ends of the frame body are arranged so as to sandwich the pair of termination members from the outside, each termination is caused by the repulsive force from the power storage element disposed between the termination members. It is difficult to apply a force in a direction away from each other to the folded piece and the joining piece of the member. Further, even if a force is applied to the frame body in a direction crossing the first direction, it is difficult to apply a force in a direction away from each other to the folded piece and the joining piece of each termination member. As a result, even if the termination member and the frame are joined by clinch joining which is weak against the force in the direction in which the members are separated from each other, the joining strength between the termination member and the frame can be ensured.

In the power storage device,
In the clinch-bonded portion, it is preferable that a concave portion that is recessed toward the end member main body is formed in the folded piece, and a convex portion that fits into the concave portion is formed in the joint piece.

  According to such a configuration, the portion projecting from the joining piece in the first direction to the side opposite to the terminal member main body is not formed by clinch joining, and thus the power storage device can be further downsized in the first direction.

In the method for manufacturing the power storage device according to the present invention,
A first joining piece extending in a first direction from a peripheral portion of a terminal member body adjacent to a placement region in which at least one power storage element is placed and extending in a direction perpendicular to the first direction in the first direction; Clinch joining the first joining piece and the second joining piece in a state where the second joining piece extending in the first direction from the end of the frame main body extending in the first direction is overlapped;
Bending the clinch-bonded first joining piece and the second joining piece in an overlapped state so that the second joining piece overlaps the terminal member main body in the first direction.

  According to this configuration, a power storage device that is reduced in size and weight can be obtained. That is, according to this configuration, the manufactured power storage device is joined (connected) so that the joining piece overlaps the folded piece folded so as to overlap the terminal member body in the first direction. Compared to the configuration in which the joint portion between the terminal member and the terminal member protrudes from the terminal member body in the first direction, the size is reduced. Moreover, according to this configuration, in the manufactured power storage device, the joining between the terminal member and the frame (specifically, the joining between the folded piece and the joining piece) is performed by clinching joining (joining by mechanical clinching). The weight is reduced compared to the case where the end member and the frame are connected (joined) using a connecting member such as a bolt or a self-piercing rivet.

Further, the power storage device according to the present invention includes:
At least one power storage element;
A termination member adjacent to the arrangement region of the power storage element in the first direction,
A frame connected to the termination member,
The termination member has a termination member main body that extends in a direction orthogonal to the first direction, and extends from the peripheral edge of the termination member main body, and on the opposite side to the power storage element so as to overlap the termination member main body in the first direction. A folded piece that is folded,
The frame includes a frame main body extending in the first direction along the power storage element, and an abutting piece that overlaps with the folded piece and extends from the end of the frame main body along the terminal member main body. Have.

  According to such a configuration, since the contact piece overlaps with the folded piece folded back so as to overlap the terminal member body in the first direction, the folded piece and the contact piece protrude in the first direction. In comparison, the size can be reduced.

  As mentioned above, according to this invention, the manufacturing method of the electrical storage apparatus reduced in size and weight and an electrical storage apparatus can be provided.

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 used in the power storage device. FIG. 4 is a front view of the power storage element. FIG. 5 is an exploded perspective view of the power storage element. FIG. 6 is a flowchart for explaining a method of manufacturing the power storage device. FIG. 7 is a partially enlarged view of the power storage device before bending the joint portion. FIG. 8 is a view showing a state before the male mold is pushed in the clinch joint. FIG. 9 is a view showing a state after the male mold is pushed in the clinch joint. FIG. 10 is an enlarged view of a range indicated by A in FIG. FIG. 11 is a partially enlarged view of the power storage device after the joint portion is bent. FIG. 12 is a diagram for explaining the force acting when the folded piece and the joining piece are bent. FIG. 13 is a diagram for explaining the folded piece and the contact piece.

  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 at least one power storage element 1 and a holding member 3 that holds the power storage element 1. The power storage device of the present embodiment includes a spacer 2 adjacent to the power storage element 1, and the holding member 3 holds the power storage element 1 and the spacer 2 together. The holding member 3 is made of a conductive material such as metal. For this reason, the power storage device includes an insulator 4 that is insulated and disposed between the power storage element 1 and the holding member 3.

  As shown in FIGS. 3 to 5, the storage element 1 includes an electrode body 12 including a positive electrode and a negative electrode, a case 10 that houses the electrode body 12, and a pair of external terminals 11 that are disposed on the outer surface of the case 10. Is provided. The power storage device 1 also includes a current collector 13 that electrically connects the electrode body 12 and the external terminal 11. The electrode body 12 and the current collector 13 are accommodated in the case 10 while being accommodated (enclosed) in a bag-like insulating member 14. That is, the insulating member 14 is disposed between the electrode body 12 and the current collector 13 and the case 10 in the case 10 to insulate the electrode body 12 and the current collector 13 from the case 10.

  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 plate-like closing part 100a 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 has a flat rectangular tube shape.

  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.

The first wall 100c and the second wall 100d are arranged adjacent to each other with their edges abutted against each other. And the edge of the adjacent 1st wall 100c and the edge of the 2nd wall 100d are connected over the full length. Thereby, the trunk | drum 100b is formed in square tube shape. One end of the trunk portion 100b is closed by the closing portion 100a, and the other end of the trunk portion 100b 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. Accordingly, the body 100b has a flat rectangular tube shape.

  The power storage device of this embodiment includes a plurality of power storage elements 1. Each of the plurality of power storage elements 1 is aligned in one direction. In addition, the power storage device includes a bus bar 15 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 defined as the X-axis direction. In addition, the direction (second direction) in which the pair of second walls 100d of the power storage element 1 are opposed to each other is one of the two axial directions orthogonal to the direction in which the power storage elements 1 are aligned (X-axis direction). The axial direction is the remaining one direction, and the direction (third direction) in which the cover plate 101 of the electricity storage device 1 and the closing portion 100a face each other is the Z-axis direction. Accordingly, each drawing shows orthogonal coordinate axes corresponding to the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.

  The spacer 2 has an insulating property. Spacer 2 includes a base adjacent to case 10 of power storage element 1 and a restricting portion that prevents positional displacement of power storage element 1 adjacent to the base. The power storage device of the present embodiment includes two types of spacers 2A and 2B as shown in FIG. Specifically, the power storage device includes a spacer (hereinafter referred to as an internal spacer) 2A disposed between two power storage elements 1 and the end of the plurality of power storage elements 1 (that is, the end in the X-axis direction). And a spacer (hereinafter referred to as an “external spacer”) 2B adjacent only to the electricity storage device 1 in FIG.

  The internal spacer 2A includes a base 20A that extends along the power storage elements 1 that are adjacent to each other between the power storage elements 1, and a restricting portion 21A that prevents displacement of the two power storage elements 1 adjacent to the base 20A.

  The outer spacer 2B has a base 20B that extends along the adjacent power storage elements 1 and a restricting portion 21B that determines the position of the power storage elements 1 adjacent to the base 20B. The base 20 </ b> B of the outer spacer 2 </ b> B faces the terminal member 30 that constitutes the holding member 3. That is, the external spacer 2 </ b> B is disposed between the power storage element 1 and the termination member 30.

  As described above, the external spacers 2B of the present embodiment are arranged so as to be adjacent to the power storage elements 1 at both ends in the X-axis direction. That is, the power storage device includes a pair of external spacers 2B, and a pair of external spacers 2B are provided so as to sandwich a plurality of aligned power storage elements 1 therebetween. Each of the pair of external spacers 2B is disposed in a symmetric posture with respect to the X-axis direction.

  As shown in FIGS. 1 and 2, the holding member 3 is disposed along the power storage element 1, the terminal member 30 adjacent to the region (arrangement region) in which the power storage element 1 is disposed in the X-axis direction, and the terminal A frame 31 connected to the member 30. The holding member 3 of the present embodiment includes a pair of termination members 30 disposed on both sides of the arrangement region in the X-axis direction, and a pair of frames 31 that connect (connect) the pair of termination members 30. The termination member 30 of this embodiment is adjacent to the electricity storage element 1 through the external spacer 2B.

  Each of the pair of termination members 30 includes a main body 300 that extends in a direction orthogonal to the X-axis direction, and a folded piece 301 that extends from the peripheral edge of the main body 300 and is folded back so as to overlap the main body 300 in the X-axis direction. Have.

  The main body 300 is a plate-shaped portion that extends along the power storage element 1 (in the example of the present embodiment, the base 20B of the external spacer 2B). The main body 300 has a contour shape corresponding to the adjacent power storage element 1 (specifically, the first wall 100c of the body portion 100b). That is, the main body 300 has a peripheral portion having substantially the same shape as that of the adjacent power storage elements 1 when viewed in the X-axis direction. Specifically, the main body 300 has 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 (corresponding to the closing portion 100a of the power storage element 1). Second end) disposed at a position to be The main body 300 includes 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 (the other second end of the power storage element 1). Wall 100d and a fourth end disposed at a corresponding position).

  The main body 300 includes at least one convex portion 302 that protrudes in the X-axis direction on the side opposite to the region where the power storage element 1 is disposed. The main body 300 of this embodiment has two convex portions 302. A male screw 303 protrudes from the convex portion 302. Specifically, the head of the bolt is located between the convex portion 302 and the outer spacer 2B, and the male screw 303 of the bolt penetrates the convex portion 302 and projects outward. That is, the power storage element 1 has a bolt that is arranged so that the male screw 303 penetrates the convex portion 302 from the inner side of the main body 300 (between the main body 300 and the outer spacer 2B) to the outer side in the X-axis direction. The bolt is used when the power storage device is fixed (arranged) to a battery pack, a vehicle or the like on which the power storage device is mounted.

  A plurality of folded pieces 301 are provided on the termination member 30. The terminal member 30 of the present embodiment is provided with four folded pieces 301. Specifically, two folded pieces 301 are provided at the third end and the fourth end of the main body 300. Specifically, the folded piece 301 is provided at an end portion on the first end side and an end portion on the second end side at the third end of the main body 300. Further, the folded piece 301 is provided at the end portion on the first end side and the end portion on the second end side at the fourth end of the main body 300. Each folded piece 301 is joined to the frame 31.

  The frame 31 includes a frame main body 310 extending in the X-axis direction, and a joining piece 315 extending along the main body 300 so as to overlap the folded piece 301 of the terminal member 30 from an end (end in the X-axis direction) of the frame main body 310. Have. The joining pieces 315 of the present embodiment are provided at both ends of the frame body 310, respectively.

  The frame main body 310 connects a pair of connection portions 311 extending in the X-axis direction and arranged in parallel or substantially in parallel with a gap in the Z-axis direction, and ends of the pair of connection portions 311 extending in the Z-axis direction. It has a pair of support part 312 and the reinforcement part 313 which extends in a Z-axis direction and connects the center part or substantially center part of a pair of connection part 311. As described above, the frame main body 310 according to the present embodiment has a frame shape by connecting the end portions of the pair of connection portions 311 with the pair of support portions 312 at both end positions in the X-axis direction.

  Moreover, since the reinforcement part 313 has connected the center part or substantially center part in the X-axis direction of a pair of connection part 311, a deformation | transformation of a pair of connection part 311 is suppressed.

  Two joining pieces 315 are provided at both ends of the frame main body 310 in the X-axis direction. Each joining piece 315 is provided at a position corresponding to the folded piece 301 (position overlapping in the X-axis direction). The joining piece 315 has substantially the same shape as the folded piece 301 when viewed in the X-axis direction. The joining piece 315 of this embodiment is rectangular.

  The joining piece 315 is joined to the folded piece 301. In the power storage device of this embodiment, the folded piece 301 and the joining piece 315 are clinched (joined by mechanical clinching). In the joint portion (the clinched joint portion) of the present embodiment, the folded piece 301 is formed with a recess 305 (see FIG. 9) that is recessed toward the main body 300, and the joint piece 315 is fitted into the recess 305 (fitting) A convex portion 316 (see FIG. 9) is formed.

  The insulator 4 is made of an insulating material. The insulator 4 is disposed between the frame 31 and the power storage element 1 as described above. For this reason, the insulator 4 has a shape corresponding to the frame 31 (in the example of the present embodiment, a frame shape). Specifically, the insulator 4 includes a pair of first insulating portions 40 disposed between each of the pair of connection portions 311 and the power storage element 1, and a space between each of the pair of support portions 312 and the power storage element 1. It has a pair of 2nd insulation parts 41 arranged. Insulator 4 also has a third insulating portion 42 disposed between reinforcing portion 313 and power storage element 1.

  Next, a method for manufacturing the power storage device will be described with reference to FIGS.

  The electricity storage elements 1 and the internal spacers 2A are alternately arranged in the X-axis direction, the external spacers 2B are arranged next to (outside) the outermost electricity storage elements 1 in the X-axis direction, and terminated further next (outside). Each member 30 is arranged (step S1). Subsequently, the frame 31 is arranged so that the insulator 4 is sandwiched between the frame 31 and the plurality of power storage elements 1 arranged in the X-axis direction (step S2). At this time, as shown in FIG. 7, each folded piece (first joining piece) 301 of the termination member 30 extends in the X-axis direction from the peripheral edge of the main body 300 (that is, is erected with respect to the main body 300. And each joining piece (second joining piece) 315 of the frame 31 extends from the end of the frame body 310 in the X-axis direction. Each folded piece 301 and the joining piece 315 overlap in the Y-axis direction.

  In this state, the overlapping folded piece 301 and the joining piece 315 are clinched and joined (step S3). As shown in FIGS. 8 and 9, this clinch joint (joint by mechanical clinch) is a part of the overlapped plate-shaped joint part (in the example of this embodiment, the folded piece 301 and the joint piece 315). It is pushed into the female die (die) 81 by the die (punch) 80, whereby the plate-like member is locally bent, and the interlock portion (diameter-enlarged portion: drawing) 10)) Joining by forming 317 (concavo-convex fitting). In the present embodiment, clinch joining is performed in a state where the female mold 81 is disposed on the inner side (folded piece 301 side) in the Y-axis direction and the male mold 80 is disposed on the outer side (joined piece 315 side). In the example of the present embodiment, clinch joining is performed twice (two locations) to one folded piece 301 and the joining piece 315.

  Subsequently, the folded piece 301 and the joined piece 315 in the state of being clinch joined are bent so as to overlap (follow) the main body 300 of the termination member 30 (step S4). At this time, a force in the compression direction is applied to the bent portion of the folded piece 301 (see arrow α in FIG. 12), and a force is applied to the bent portion of the joining piece 315 in the pulling direction (see arrow β in FIG. 12). . For this reason, the force applied to each power storage element 1 from the pair of termination members 30 after the folded pieces 301 and the joining pieces 315 are bent (force sandwiched between the pair of termination members 30) becomes a predetermined magnitude. The shape, each dimension, the bending position, etc. of the folding piece 301 and the joining piece 315 are set.

  Each of the folded pieces 301 and the joined pieces 315 that have been clinched and joined is folded, whereby the power storage device is completed.

  According to the above power storage device, the joining piece 315 is joined (connected) so as to overlap the folded piece 301 folded so as to overlap the main body 300 of the terminal member 30 in the X-axis direction (first direction). . For this reason, the electrical storage device can be reduced in size as compared with the device in which the joining portion (the folded piece 301 and the joining piece 315) of the frame 31 and the termination member 30 protrudes from the main body 300 of the termination member 30 in the X-axis direction. Moreover, since the termination member 30 and the frame 31 (in the example of this embodiment, the folded piece 301 and the joining piece 315) are clinched, the termination member is formed using a connecting member such as a bolt or a self-piercing rivet. Compared to the configuration in which the frame 30 and the frame 31 are connected (joined), the power storage device can be reduced in weight.

  In the power storage device of this embodiment, a pair of joining pieces 315 provided at both ends (both ends in the X-axis direction) of the frame body 310 are disposed so as to sandwich the pair of termination members 30 from the outside (outside in the X-axis direction). ing. Thereby, it is difficult to apply forces in directions away from each other to the folded piece 301 of each termination member 30 and the joining piece 315 of the frame 31 by the repulsive force from the power storage element 1 disposed between the termination members 30. Further, even if a force is applied to the frame main body 310 in a direction intersecting the X-axis direction, a force in a direction away from each other is not applied to the folded piece 301 of each terminal member 30 and the joining piece 315 of the frame 31. As a result, even if the termination member 30 and the frame 31 are joined by clinch joining that is weak against the force in the direction in which the members are separated from each other, the joining strength between the termination member 30 and the frame 31 can be ensured.

  In the clinch joined portion (folded piece 301 and joined piece 315) in the power storage device of the present embodiment, the folded piece 301 is formed with a recess 305 that is recessed toward the main body 300 of the termination member 30, and the joined piece 315 is A convex portion 316 that fits into the concave portion 305 is formed. For this reason, the site | part which protrudes on the opposite side to the main body 300 in the X-axis direction from the joining piece 315 by clinch joining is not formed. For this reason, compared with the power storage device in which the projecting portion is formed, the power storage device of this embodiment can be further downsized in the X-axis direction.

  Further, in the method for manufacturing the power storage device of the present embodiment, a power storage device that is reduced in size and weight can be obtained. That is, the power storage device manufactured by the manufacturing method according to the present embodiment is joined (coupled) so that the joining piece 315 overlaps the folded piece 301 folded so as to overlap the main body 300 of the termination member 30 in the X-axis direction. Therefore, the joint portion between the frame 31 and the termination member 30 is downsized as compared with the device that protrudes from the main body 300 in the X-axis direction. In addition, since the joining of the termination member 30 and the frame 31 (specifically, the joining of the folded piece 301 and the joining piece 315) is performed by clinch joining, the termination member is formed using a connecting member such as a bolt or a self-piercing rivet. Compared with the structure which connects (joins) 30 and the frame 31, it is reduced in weight.

  In addition, the electrical storage element of this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this 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 of the above embodiment, the folded piece 301 of the termination member 30 and the joining piece 315 of the frame 31 are joined (in the example of the above embodiment, clinching joined), but the configuration is not limited thereto. For example, as shown in FIG. 13, the folded piece 301 and the contact piece 315A do not have to be joined. That is, the contact piece 315 </ b> A may overlap with the folded piece 301 and extend from the end of the frame main body 310 along the main body 300 of the termination member 30. Also with this configuration, the power storage device can be downsized in the X-axis direction as compared to the configuration in which the folded piece 301 and the contact piece 315A protrude in the X-axis direction.

  Further, when the power storage device including the contact piece 315A is manufactured, the folded piece 301 and the contact piece 315A that extend in the X-axis direction and overlap in the Y-axis direction are connected to the main body 300 of the termination member 30. Bending is performed so as to overlap (form), thereby forming a folded piece 301 and a contact piece 315A as shown in FIG. 13, whereby a force in the compression direction can be applied to the folded piece 301 (arrow α in FIG. 12). reference). Thereby, the clamping force of the X-axis direction resulting from the said compression force can be applied with respect to the some electrical storage element 1 arrange | positioned between a pair of termination | terminus members 30. FIG.

  Further, the folded piece 301 and the contact piece 315A may be joined by, for example, a fastening member (fastener) such as a bolt or self-piercing.

  In the clinch-bonded part in the power storage device of the above embodiment, the convex part 316 (part where the interlock part 317 is formed by fitting into the concave part 305) protrudes in the direction from the joint piece 315 toward the folded piece 301. It is not limited to this configuration. The convex part 316 may protrude in the direction from the folded piece 301 toward the joining piece 315. Note that it is more preferable that the protruding portion 316 protrude in the direction from the joining piece 315 toward the folded piece 301 because the entire length of the power storage device can be shortened.

  The number of joining parts (sites to be clinch joined: in the above embodiment, the folded pieces 301 and the joining pieces 315) is not limited. In the power storage device of the above embodiment, two joint portions are provided at both ends of the frame 31 in the X-axis direction, but one may be provided at each end of the frame 31 or three. It may be provided one by one. In addition, the shape of the joining portion is not limited to a rectangular shape. Further, the number of times of clinch joining in one folded piece 301 and the joining piece 315 is not limited. That is, in the above embodiment, clinch joining is performed twice for each folded piece 301 and joining piece 315. However, the present invention is not limited to this, and the number of clinch joining may be one time or three times. That's all.

  The specific shape of the frame 31 is not limited. The frame main body 310 of the above embodiment has a frame shape, but may be configured by a member or the like that simply extends in the X-axis direction, for example.

  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, 2 ... Spacer, 2A ... Internal spacer, 20A ... Base, 21A ... Restriction part, 2B ... External spacer, 20B ... Base, 21B ... Restriction part, 3 ... Holding member, 30 ... Termination member, 300 ... Main body, 301 ... Folded piece (first joining piece), 302 ... Convex part, 305 ... concave part, 31 ... frame, 310 ... frame main body, 311 ... connection part, 312 ... support part, 313 ... reinforcing part, 315 ... joined piece (second joined piece), 315A ... contact piece, 316 ... Convex part, 317 ... Interlock part, 4 ... Insulator, 40 ... First insulating part, 41 ... Second insulating part, 42 ... Third insulating part, 11 ... External terminal, 12 ... Electrode body, 13 ... Current collector, 14: Insulating member, 15 Bus bar, 80 ... male mold, 81 ... female mold

Claims (4)

At least one power storage element;
A termination member adjacent to the arrangement region of the power storage element in the first direction,
A frame connected to the termination member,
The termination member has a termination member main body that extends in a direction orthogonal to the first direction, and extends from the peripheral edge of the termination member main body, and on the opposite side to the power storage element so as to overlap the termination member main body in the first direction. A folded piece that is folded,
The frame includes a frame body extending in the first direction along the power storage element, and a joining piece extending along the terminal member body so as to overlap the folded piece from an end of the frame body.
The power storage device, wherein the folded piece and the joining piece are joined to each other by clinch joining. A pair of the termination members are provided so as to be arranged on both sides of the arrangement region in the first direction,
The frame connects the end members to each other,
The power storage device according to claim 1, wherein the joining pieces are provided at both ends of the frame body.   The clinched joint portion has a concave portion that is recessed toward the end member main body formed in the folded piece, and a convex portion that fits into the concave portion is formed in the joint piece. The power storage device described in 1. A first joining piece extending in a first direction from a peripheral portion of a terminal member body adjacent to a placement region in which at least one power storage element is placed and extending in a direction perpendicular to the first direction in the first direction; Clinch joining the first joining piece and the second joining piece in a state where the second joining piece extending in the first direction from the end of the frame main body extending in the first direction is overlapped;
Bending the clinch-bonded first joining piece and the second joining piece in an overlapped state so that the second joining piece overlaps the terminal member main body in the first direction. Production method.

Images