JP2013218827A - Power storage device, and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device in which a collector portion and a collector member can be easily coupled to each other, and a vehicle.SOLUTION: A first protrusion portion 42 and a second protrusion portion 43 are formed on a first terminal member 40 constituting a collector terminal 30, and a third protrusion portion 52 and a fourth protrusion portion 53 are formed on a second terminal member 50. Then, a second inclined portion 43d inclined on a rear end side from a tip side toward a base end side is formed on the second protrusion portion 43 of the first terminal member 40, while a fourth inclined portion 53d inclined on a front end side from the tip side toward the base end side is formed on the fourth protrusion portion 53 of the second terminal member 50. In a lamination direction of an electrode body 25, the second inclined portion 43d is formed to exceed a half of the width of the second protrusion portion 43, and the fourth inclined portion 53d is formed to exceed a half of the width of the fourth protrusion portion 53.

Description

  The present invention relates to a power storage device and a vehicle.

  Conventionally, lithium ion secondary batteries, nickel hydride secondary batteries, and the like are known as secondary batteries that are a type of power storage device. For example, in a lithium ion secondary battery, an electrode body having a layered electrode sheet is accommodated in a case, and a current collector formed at the edge of the electrode body and an electrode terminal protruding outside the case are collected. It is electrically connected by an electric member (for example, Patent Document 1). Note that the current collector has a layered structure in which a plurality of uncoated portions (so-called lead portions) on which no active material is applied are overlapped on the electrode sheet.

  In Patent Document 1, an uncoated part that forms a current collector is divided into two bundles (so-called lead groups), and a metal block is inserted between the divided uncoated parts, and a current collector (uncoated) Part), the current collecting member, and the metal block are energized while being sandwiched between the electrodes for resistance welding, thereby welding and electrically connecting the current collecting part (uncoated part) and the current collecting member. .

JP 2011-92995 A

  As in Patent Document 1, as a method of previously dividing the uncoated portion that forms a layer in the current collecting portion into two, for example, it is conceivable to insert a dividing jig between the uncoated portions. However, in the current collector, the uncoated part made of a thin metal plate has a layered structure, so that it is difficult to insert the jig between the uncoated parts. When the jig and the edge of the uncoated part (metal thin plate) come into contact with each other, the uncoated part may be damaged. As described above, conventionally, it has been difficult to divide an uncoated part having a layered structure into a plurality of parts and connect the current collecting part and the current collecting member.

  The present invention has been made paying attention to the problems existing in the above prior art, and an object thereof is to provide a power storage device and a vehicle that can easily connect a current collector and a current collector. .

  The invention according to claim 1 is a layered structure in which a plurality of electrode sheets having a thin metal plate, a coated portion where an active material is applied to the surface of the thin metal plate, and an uncoated portion where the active material is not applied are stacked. From the electrode body, a current collector portion extending from one edge of the electrode body, and a plurality of uncoated portions of the electrode sheets overlapping to form a layered structure, and the electrode body A power storage device having an electrode terminal for taking out electric power, and a current collecting member that electrically connects the current collecting part and the electrode terminal, wherein both ends of the electrode body in the laminating direction have the laminated layer End surfaces extending along the direction are respectively formed, and the current collecting members are arranged on one end surface of the both end portions and aligned in a direction perpendicular to the stacking direction of the electrode bodies, And the second member, and the first member includes the electrode A first side surface that is a side surface parallel to the layer and a second side surface that is a side surface opposite to the first side surface, and the first member is electrically connected to the electrode terminal, The first member is formed with a first protrusion that protrudes toward the second member and at least one second protrusion, and the first protrusion is at least continuous with the first side surface. And a first end surface parallel to the first side surface, a second end surface which is an end surface opposite to the first end surface, and an end on the tip side of the first protrusion on the first end surface and the second end surface. The first connecting part has a first inclined part, the first inclined part forms an acute angle with the first end surface, and the second projecting part is at least A third end surface formed on the first end surface side and parallel to the first end surface; A fourth end surface that is the end surface opposite to the end surface; and a second connecting portion that connects the third end surface and the end portions of the second projecting portion on the tip end side of the fourth end surface, and the second connecting portion. The portion has a second inclined portion, the second inclined portion forms an acute angle with the fourth end surface, and the second member is a third side surface that is a side surface parallel to the layer in the electrode body, A fourth side surface, which is a side surface opposite to the third side surface, is formed, the third side surface is on the same side as the first side surface, and the fourth side surface is on the same side as the second side surface, respectively. The second member is formed continuously with the first member or through the uncoated portion forming the current collector, and the second member protrudes toward the first member. 3 protrusions and at least one fourth protrusion are formed, and the third protrusion includes at least the fourth protrusion. A fifth end surface that is continuous with the side surface and parallel to the fourth side surface; a sixth end surface that is an end surface opposite to the fifth end surface; and the third protrusion on the fifth end surface and the sixth end surface. The third connecting portion has a third inclined portion, and the third inclined portion forms an acute angle with the fifth end surface, and the fourth connecting portion connects the end portions on the distal end side of the third connecting portion. The protrusion is at least a seventh end surface formed on the fifth end surface side and parallel to the fifth end surface, an eighth end surface that is an end surface opposite to the seventh end surface, and the seventh end surface. The fourth end portion includes a fourth connecting portion that connects end portions of the second projecting portions on the eighth end surface, and the fourth connecting portion includes a fourth inclined portion, and the fourth inclined portion includes: An acute angle with the eighth end surface, and in the stacking direction, from the first end surface side, the first protrusion and the fourth protrusion And the second protrusion, the third protrusion, the second protrusion, and the fourth protrusion are sequentially disposed from the second end surface side in the stacking direction. The current collector is formed between the first projection and the fourth projection, between the second projection and the fourth projection, and between the second projection and the third projection. The uncoated portions are each divided and arranged in a plurality of bundles, and the second inclined portion and the fourth inclined portion of the second protruding portion and the fourth protruding portion, respectively, in the stacking direction. The gist of the present invention is that the width is formed to exceed half of the width of the second protrusion and the fourth protrusion in the stacking direction.

  According to this, a 1st member and a 2nd member are arrange | positioned so that the said current collection part may be pinched | interposed from the direction orthogonal to the lamination direction in a current collection part. And each 1st projection part formed in the 1st member and the 2nd projection part formed in the 2nd member are arranged outside the lamination direction in a current collection part, and each electrode sheet which makes a current collection part The second protrusion formed on the first member and the fourth protrusion formed on the second member are inserted between the uncoated portions.

  Here, the second inclined portion formed at the second connecting portion of the second projecting portion forms an acute angle with the fourth end surface, and the fourth inclined portion formed at the fourth connecting portion of the fourth projecting portion is the eighth end surface. Therefore, the second inclined portion and the fourth inclined portion are inclined in the same direction side. And while the second inclined portion and the fourth inclined portion are along each other, the second protruding portion of the first member is inserted between the third protruding portion and the fourth protruding portion of the second member, The fourth protrusion of the second member is inserted between the first protrusion and the second protrusion of the first member. Accordingly, the first member and the second member are relatively moved (skewed) in the direction in which the first protrusion and the third protrusion are close to each other.

  Therefore, a current collector is formed between the first protrusion and the fourth protrusion, between the second protrusion and the fourth protrusion, and between the second protrusion and the third protrusion. The uncoated portion is divided into a plurality of bundles, and the current collecting member and the current collecting portion are thereby connected and electrically connected. In particular, according to the first aspect of the present invention, the width in the stacking direction of the second inclined portion is formed to exceed half the width of the second projecting portion in the stacking direction, and the stack in the fourth inclined portion. The width in the direction is formed to exceed half of the width in the stacking direction of the fourth protrusions. For this reason, even if the current collector is larger than the length in the stacking direction of the first member and the second member, the second inclined portion and the fourth tilted portion are formed in the stacking direction by the formation range. It can arrange | position so that many uncoated parts may be inserted | pinched between 1 member and 2nd member. Therefore, the current collector and the current collector can be easily connected.

  According to a second aspect of the present invention, in the power storage device according to the first aspect, each of the first inclined portion, the second inclined portion, the third inclined portion, and the fourth inclined portion is the first protrusion. And the second protrusion, the third protrusion, and the fourth protrusion.

  According to this, each 1st-4th inclination part is formed in the front-end | tip of the 1st-4th projection part, respectively. For this reason, compared with the structure which does not provide an inclination part at the front-end | tip of each 1st-4th inclination part, a 2nd, 4th protrusion part is provided between the uncoated parts (metal thin plate) which make a current collection part. When inserting, it can suppress that an uncoated part (metal thin plate) is damaged by the front-end | tip of each 1st-4th projection part contacting the edge part of an uncoated part.

  The invention according to claim 3 is the power storage device according to claim 1 or 2, wherein the tip of the third protrusion and the tip of the fourth protrusion, the first protrusion of the first member, and the The first protrusion, which is the base end of the second protrusion, is spaced apart from the first protrusion and the second protrusion, and the third protrusion of the second member. And it makes it a summary to have separated from the 2nd base end part which is a base end part of the said 4th projection part.

  According to this, while the front-end | tip and 1st base end part of a 3rd projection part and a 4th projection part are spaced apart, the front-end | tip and 2nd base end part of a 1st projection part and a 2nd projection part are spaced apart. doing. For this reason, it can arrange | position so that the uncoated part in an electrode sheet may be pinched | interposed reliably between each projection part using the elasticity of a 1st-4th projection part.

  Invention of Claim 4 is an electrical storage apparatus of any one of Claims 1-3. WHEREIN: In the direction orthogonal to the said lamination direction, the edge part of the said uncoated part which makes the said current collection part Of these, the first edge disposed on the first base end side is inclined toward the second base end side, and among the edges of the uncoated part, the second base end side The gist is that the second edge portion arranged on the side is inclined toward the first base end side.

  According to this, when inserting the front-end | tip part of the 2nd projection part formed in the 1st member between uncoated parts, the area which the said front-end | tip part contact | abuts with the 1st edge part of an uncoated part. While being able to be reduced, when the tip of the fourth protrusion formed on the second member is inserted between the uncoated portions, the tip contacts the second edge of the uncoated portion. The area can be reduced. Therefore, when inserting the 2nd projection part and the 4th projection part between uncoated parts, it can control that an uncoated part (metal thin plate) is damaged.

  According to a fifth aspect of the present invention, in the power storage device according to any one of the first to fourth aspects, the first projecting portion and the third projecting portion, and the second projecting portion and the fourth projecting portion. The gist is that each has the same shape.

According to this, compared with the case where the shape of a contact area with the uncoated part which makes a current collection part is formed in a different shape with the first and second members, the first and second members are simply formed. it can.
The invention according to claim 6 is the power storage device according to any one of claims 1 to 5, wherein the second protrusion and the fourth protrusion are in the stacking direction on the base end side. The gist is that the cross-sectional area along the laminating direction on each tip side is smaller than the cross-sectional area along the direction.

  According to this, since the second and fourth projecting portions have a tapered shape in which the cross-sectional area along the stacking direction is smaller on the distal end side than on the proximal end side, the second and fourth projecting portions are When inserting between uncoated parts (thin metal plates), the area where the tips of the second and fourth protrusions abut against each edge of the uncoated part can be reduced. Therefore, when inserting the 2nd, 4th projection part between uncoated parts, it can control that an uncoated part is damaged.

  The invention according to claim 7 is the power storage device according to any one of claims 1 to 6, wherein the first member and the second member are formed of the same metal as the metal thin plate. Is the gist.

  According to this, since the 1st member and the 2nd member are formed from the same metal as a metal thin plate, the state which has arrange | positioned the uncoated part which makes a current collection part between the 1st, 2nd members By performing resistance welding in step 1, the first and second members and the uncoated portion can be easily joined.

  The invention according to claim 8 is a layered structure in which a plurality of electrode sheets having a thin metal plate, a coated portion in which an active material is applied to the surface of the thin metal plate, and an uncoated portion in which the active material is not applied are overlapped. From the electrode body, a current collector portion extending from one edge of the electrode body, and a plurality of uncoated portions of the electrode sheets overlapping to form a layered structure, and the electrode body A power storage device having an electrode terminal for taking out electric power, and a current collecting member that electrically connects the current collecting part and the electrode terminal, wherein both ends of the electrode body in the laminating direction have the laminated layer End surfaces extending along the direction are respectively formed, and the current collecting members are arranged on one end surface of the both end portions and aligned in a direction perpendicular to the stacking direction of the electrode bodies, And the second member, and the first member includes the electrode A first side surface that is a side surface parallel to the layer and a second side surface that is a side surface opposite to the first side surface, and the first member is electrically connected to the electrode terminal, The first member is formed with a first protrusion that protrudes toward the second member and at least one second protrusion, and the first protrusion is at least continuous with the first side surface. And a first end surface parallel to the first side surface, a second end surface which is an end surface opposite to the first end surface, and an end on the tip side of the first protrusion on the first end surface and the second end surface. The first connecting part has a first inclined part, the first inclined part forms an acute angle with the first end surface, and the second projecting part is at least A third end surface formed on the first end surface side and parallel to the first end surface; A fourth end surface that is the end surface opposite to the end surface; and a second connecting portion that connects the third end surface and the end portions of the second projecting portion on the tip end side of the fourth end surface, and the second connecting portion. The portion has a second inclined portion, the second inclined portion forms an acute angle with the fourth end surface, and the second member is a third side surface that is a side surface parallel to the layer in the electrode body, A fourth side surface, which is a side surface opposite to the third side surface, is formed, the third side surface is on the same side as the first side surface, and the fourth side surface is on the same side as the second side surface, respectively. The second member is formed continuously with the first member or through the uncoated portion forming the current collector, and the second member protrudes toward the first member. 3 protrusions and at least one fourth protrusion are formed, and the third protrusion includes at least the fourth protrusion. A fifth end surface that is continuous with the side surface and parallel to the fourth side surface; a sixth end surface that is an end surface opposite to the fifth end surface; and the third protrusion on the fifth end surface and the sixth end surface. The third connecting portion has a third inclined portion, and the third inclined portion forms an acute angle with the fifth end surface, and the fourth connecting portion connects the end portions on the distal end side of the third connecting portion. The protrusion is at least a seventh end surface formed on the fifth end surface side and parallel to the fifth end surface, an eighth end surface that is an end surface opposite to the seventh end surface, and the seventh end surface. The fourth end portion includes a fourth connecting portion that connects end portions of the second projecting portions on the eighth end surface, and the fourth connecting portion includes a fourth inclined portion, and the fourth inclined portion includes: An acute angle with the eighth end surface, and in the stacking direction, from the first end surface side, the first protrusion and the fourth protrusion And the second protrusion, the third protrusion, the second protrusion, and the fourth protrusion are sequentially disposed from the second end surface side in the stacking direction. The current collector is formed between the first projection and the fourth projection, between the second projection and the fourth projection, and between the second projection and the third projection. The uncoated portions are each divided and arranged in a plurality of bundles, and in the direction orthogonal to the stacking direction, the first protrusions and the first protrusions of the uncoated portions that form the current collector The first edge portion disposed on the first base end side which is the base end portion of the second projection portion is the second base end side which is the base end portion of the third projection portion and the fourth projection portion. Of the uncoated portion, the second edge disposed on the second base end side is inclined toward the first base end side. The gist that you are.

  According to this, similarly to the first aspect of the invention, between the first protrusion and the fourth protrusion, between the second protrusion and the fourth protrusion, and between the second protrusion and the first protrusion. Between the three protrusions, the uncoated part forming the current collector is divided and arranged in a plurality of bundles, whereby the current collector and the current collector are connected and electrically connected. it can. And in invention of Claim 8, in the direction orthogonal to the lamination direction, the 1st edge arrange | positioned in the 1st base end part side of the 1st member among the edge parts of the uncoated part which makes a current collection part. The portion is inclined to the second base end side of the second member, and the second edge disposed on the second base end side of the second member among the edges of the uncoated portion is It inclines to the 1 base end part side. For this reason, when inserting the front-end | tip part of the 2nd projection part formed in the 1st member between uncoated parts, the area which the said front-end | tip part contacts the 1st edge part of an uncoated part is made small. In addition, when the tip of the fourth protrusion formed on the second member is inserted between the uncoated parts, the area where the tip contacts the second edge of the uncoated part Can be small. Therefore, when inserting the 2nd projection part and the 4th projection part between uncoated parts, it can control that an uncoated part (metal thin plate) is damaged. Therefore, the current collector and the current collector can be easily connected.

  According to a ninth aspect of the present invention, in the power storage device according to the eighth aspect, the second protrusion is connected to the third end surface and the fourth end surface and is formed on the electrode body side. A lower surface and a first upper surface opposite to the first lower surface are formed, and a fifth inclined surface that continues the first lower surface and the first upper surface is formed at a tip portion of the second protrusion. The fifth inclined surface has an acute angle with the first lower surface or the first upper surface, and the fourth protrusion is connected to the seventh end surface and the eighth end surface, and is on the electrode body side. And a second upper surface opposite to the second lower surface is formed, and a distal end portion of the fourth projecting portion has a second continuous with the second lower surface and the second upper surface. 6 inclined surfaces are formed, and the sixth inclined surface is characterized in that an angle formed with the second lower surface or the second upper surface is an acute angle. .

  According to this, the 5th inclined surface is formed in the front-end | tip part of a 2nd projection part, and the angle which this 5th inclined surface makes with the 1st lower surface or 1st upper surface of a 2nd projection part is an acute angle. It is. In addition, a sixth inclined surface is formed at the tip portion of the fourth protrusion, and the angle formed between the sixth inclined surface and the second lower surface or the second upper surface of the first protrusion is an acute angle. For this reason, since the tip part of the 2nd and 4th projection part makes what is called a taper shape, when inserting the 2nd and 4th projection part between uncoated parts, the 2nd and 4th projection part It is possible to reduce the area in which the tip of each of the two contacts the respective edges of the uncoated portion. Therefore, when inserting a 2nd, 4th projection part between uncoated parts, it can suppress that an uncoated part (metal thin plate) breaks.

  The gist of the power storage device according to any one of claims 1 to 9 is that the power storage device is a secondary battery. According to this, a current collection part and a current collection member can be easily connected in a secondary battery.

The gist of the invention described in claim 11 is that the power storage device according to any one of claims 1 to 10 is mounted in a vehicle.
According to this, as the power storage device, it is possible to easily connect the current collector and the current collecting member while preventing the uncoated portion forming the current collector from being damaged, and thus it is necessary to manufacture a vehicle including the power storage device. You can save time.

  ADVANTAGE OF THE INVENTION According to this invention, a current collection part and a current collection member can be connected easily.

Sectional drawing which shows a secondary battery typically. The perspective view which shows typically the decomposed | disassembled electrode body. (A) is the elements on larger scale of FIG. 1, (b) is the sectional view on the AA line shown to (a). (A) And (b) is a schematic diagram for demonstrating the manufacturing method of a secondary battery. (A) And (b) is a schematic diagram for demonstrating the manufacturing method of a secondary battery. (A) is sectional drawing which shows typically the secondary battery in 2nd Embodiment, (b) is the BB sectional drawing shown to (a). The front view which shows the electrode body in another embodiment typically. (A) is a top view which shows typically the 2nd projection part and 4th projection part in another embodiment, (b) is a front view similarly.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 as a power storage device mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle) includes a case 11 having a flat and substantially rectangular parallelepiped shape as a whole. The case 11 has a flat plate shape (this embodiment) assembled to the main body member 12 so as to seal the main body member 12 formed in a bottomed cylindrical shape (square tube shape in the present embodiment) and the opening 12a of the main body member 12. It is formed from a lid member 13 having a rectangular flat plate shape. The main body member 12 and the lid member 13 are both made of metal (for example, stainless steel or aluminum). In the following description, the longitudinal direction of the case 11 indicated by the arrow Y1 is indicated as the left-right direction, the height direction of the case 11 indicated by the arrow Y2 is indicated as the vertical direction, and the short direction of the case 11 indicated by the arrow Y3 in FIG. This is indicated as the front-rear direction. In FIG. 1, the direction perpendicular to the paper surface is the front-rear direction.

  The outer surface (upper surface) of the lid member 13 has a cylindrical shape (substantially cylindrical shape), and a positive electrode terminal as an electrode terminal (external terminal) for taking out electric power from the secondary battery 10 (electrode body 25 described later) to the outside. 15 and a negative electrode terminal 16 as an electrode terminal are provided so as to protrude. In the secondary battery 10 of the present embodiment, charging and discharging are performed via the positive terminal 15 and the negative terminal 16. The positive terminal 15 and the negative terminal 16 are insulated from the case 11 (the main body member 12 and the lid member 13).

  The case 11 has a layered structure in which a plurality of positive electrode sheets 21 as electrode sheets and negative electrode sheets 22 as electrode sheets overlap each other with a sheet-like separator 23 sandwiched therebetween (intervened state). An electrode body 25 having a (laminated structure) is accommodated (accommodated). The electrode body 25 has a rectangular parallelepiped shape (substantially rectangular parallelepiped shape) that is flat in the vertical direction and the horizontal direction as a whole. The electrode body 25 is accommodated in the case 11 in a state of being covered with an insulating bag 11a made of an insulating material, and in the case 11, for example, a lithium ion secondary battery or a nickel hydride secondary battery is used. Further, an electrolyte corresponding to the type of the secondary battery 10 is filled.

  As shown in FIG. 2, the positive electrode sheet 21 and the negative electrode sheet 22 include a metal foil 26 as a thin metal plate (metal sheet) having a rectangular (rectangular) sheet shape. The metal foil 26 is formed of a metal corresponding to the type of the secondary battery 10 such as a lithium ion secondary battery or a nickel hydride secondary battery. The metal used for the metal foil 26 is different between the positive electrode sheet 21 and the negative electrode sheet 22. In the present embodiment, the metal foil 26 of the positive electrode sheet 21 is made of aluminum, while the metal foil 26 of the negative electrode sheet 22 is made of copper.

  On both surfaces (front surface and rear surface) of each metal foil 26, except for the non-application region 26 b set with a constant width from the upper edge portion 26 a serving as one side of each metal foil 26 over the entire width in the left-right direction, An active material is applied to form an active material layer 27. That is, the non-application area 26 b extends along the upper edge portion 26 a of the metal foil 26. Note that an active material corresponding to the type of the secondary battery 10 is applied to the metal foil 26. The active material applied to the metal foil 26 is different between the positive electrode sheet 21 and the negative electrode sheet 22. In the positive electrode sheet 21 and the negative electrode sheet 22, a region where the active material layer 27 is formed becomes a coating portion 27a to which the active material is applied.

  By punching the non-coating region 26b on the left side of the upper edge portion 26a of each positive electrode sheet 21 in the left-right direction, a square (substantially square) positive electrode lead 21a is formed to extend upward. Has been. In addition, by punching the non-application area 26b on the right side of the center in the left-right direction at the upper edge portion 26a of each negative electrode sheet 22, the negative electrode lead 22a having a square shape (substantially square shape) extends upward. Has been formed. For this reason, the active material layer 27 is not formed on the surfaces of the positive electrode lead 21a and the negative electrode lead 22a. That is, in the present embodiment, the positive electrode lead 21a and the negative electrode lead 22a are uncoated portions where the active material is not applied to the surface of the metal foil 26. The separator 23 is made of an insulating resin material and is a rectangular porous sheet having an extremely fine pore structure. The separator 23 is interposed between the positive electrode sheet 21 and the negative electrode sheet 22 to insulate the positive electrode sheet 21 and the negative electrode sheet 22.

  The electrode body 25 is formed by laminating a plurality of positive electrode sheets 21 and negative electrode sheets 22 in the front-rear direction (thickness direction) with the separator 23 sandwiched between the positive electrode sheet 21 and the negative electrode sheet 22. It is formed in layers. Specifically, in the electrode body 25, the positive electrode sheets 21 and the negative electrode sheets 22 are alternately arranged in the order of... → positive electrode sheet 21.fwdarw.negative electrode sheet 22.fwdarw.positive electrode sheet 21.

  In the present embodiment, the horizontal direction indicated by the arrow Y1 and the vertical direction indicated by Y2 are the surface directions of the positive electrode sheet 21 (positive electrode lead 21a), the negative electrode sheet 22 (negative electrode lead 22a), and the separator 23. The front-rear direction indicated by Y3 is the stacking direction (layer direction) of the positive electrode sheet 21 and the negative electrode sheet 22 in the electrode body 25. Note that the stacking direction of the electrode bodies 25 coincides with the direction orthogonal to the surface directions of the positive electrode sheet 21, the negative electrode sheet 22, and the separator 23. In the present embodiment, the upward direction is the extending direction of the positive electrode lead 21a and the negative electrode lead 22a.

  As shown in FIG. 1, an upper end surface (upper end portion) 25a and a lower end surface (lower end portion) 25b extending along the stacking direction are formed at both ends of the electrode body 25 in the stacking direction. On the upper end surface 25a of the electrode body 25, on the left side of the center in the left-right direction, a current collector that forms a layered structure in which a plurality of positive electrode leads 21a are stacked in the stacking direction with no separator 23 interposed therebetween. The positive electrode current collector 28 is formed. Further, on the right side of the center in the left-right direction on the upper end surface 25a of the electrode body 25, a plurality of negative electrode leads 22a are stacked in the laminating direction with a separator 23 interposed therebetween, and serve as a current collector that forms a layered structure A negative electrode current collector 29 is formed. That is, the positive electrode current collector 28 and the negative electrode current collector 29 are arranged in the extending direction (left-right direction) in a state of being separated from each other along the extending direction of the non-application region 26 b on the upper end surface 25 a of the electrode body 25. Is formed at the center (substantially the center). Thus, in the electrode body 25 of this embodiment, the positive electrode sheet 21 (positive electrode lead 21a) and the negative electrode sheet 22 (negative electrode lead 22a) are layers.

  As shown in FIG. 1, in the secondary battery 10 of the present embodiment, the positive electrode current collector 28 (positive electrode lead 21a) and the positive electrode terminal 15 are electrically connected by a current collecting terminal 30 as a current collecting member. It is connected to the. The negative electrode current collector 29 (negative electrode lead 22a) for the negative electrode and the negative electrode terminal 16 are electrically connected by a current collector terminal 31 as a current collector. Hereinafter, the connection structure (joint structure) by the current collecting terminals 30 and 31 will be described in detail.

  In addition, the current collection terminal 31 of this embodiment is the same structure (shape) as the current collection terminal 30, and the connection structure of the current collection terminal 31 and the negative electrode current collection part 29 (negative electrode lead 22a) is current collection. This is point-symmetric with the connection structure between the terminal 30 and the positive electrode current collector 28 (positive electrode lead 21a). Therefore, in the following description, the configuration of the current collector terminal 30 and the connection structure between the current collector terminal 30 and the positive electrode current collector 28 (positive electrode lead 21a) will be described in detail, and the configuration of the current collector terminal 31 and About the connection structure of the current collection terminal 31 and the negative electrode current collection part 29 (negative electrode lead 22a), the description is abbreviate | omitted or simplified by attaching | subjecting the same code | symbol.

  As shown in FIGS. 3A and 3B, the current collecting terminal 30 is made of the same metal (aluminum in the present embodiment) as the metal foil 26 of the positive electrode sheet 21, and has a comb-like shape as a whole. It is comprised from the 1st terminal member 40 as a 1st member which makes | forms (comb shape), and the 2nd terminal member 50 as a 2nd member. The first terminal member 40 and the second terminal member 50 are arranged side by side on the upper end surface 25a of the electrode body 25 and in a direction orthogonal to the stacking direction of the electrode body 25 (the left-right direction in FIG. 3). The first terminal member 40 and the second terminal member 50 are formed such that the length (width) along the stacking direction of the electrode body 25 is smaller than the length (thickness) of the electrode body 25 in the stacking direction. . In addition, the 1st terminal member 40 and the 2nd terminal member 50 which comprise the current collection terminal 31 are formed from the same metal (copper in this embodiment) as the metal foil 26 of the negative electrode sheet 22.

  The first terminal member 40 has a substantially rectangular flat plate disposed along the upper end surface 25 a of the electrode body 25, and includes a main body 41 that is joined to and electrically connected to the positive electrode terminal 15. The main body 41 has first side surfaces 41a that are located at both ends of the electrode body 25 in the stacking direction and are parallel to the layers (the positive electrode sheet 21 and the negative electrode sheet 22) in the electrode body 25 (rear end surface). A second side surface 41b which is a side surface (front end surface) opposite to the first side surface 41a is formed.

  Further, of the outer peripheral end surface of the main body 41, the first base end portion 41 c which is a side surface disposed on the second terminal member 50 side is directed to the positive electrode lead 21 a (positive electrode sheet) toward the second terminal member 50. One first protrusion 42 and two second protrusions 43 extending along the surface direction 21) are formed. The first protrusion 42 and the second protrusion 43 are both formed in a square bar shape and are parallel to each other. In the first terminal member 40, the first projecting portion 42 is formed at the rear end portion of the main body portion 41 that is one end portion in the stacking direction of the electrode body 25.

  The first protrusion 42 includes a first end face 42a that is a rear end face of the first protrusion 42, a second end face 42b that is an end face (front end face) opposite to the first end face 42a, and a first end face 42a. And the 1st connection part 42c which connects the edge parts of the front end side of the 1st projection part 42 in the 2nd end surface 42b is comprised. The first connecting portion 42c formed at the distal end of the first projecting portion 42 inclines toward the second side surface 41b side of the main body portion 41 from the distal end side of the first projecting portion 42 toward the proximal end portion side. One inclined portion 42d is formed. The first inclined portion 42d has an acute angle with the first end surface 42a.

  The first inclined portion 42 d formed on the first protrusion 42 is formed across the entire width of the first protrusion 42 in the stacking direction of the electrode body 25. The first inclined portion 42d formed on the first protrusion 42 is formed over the entire width (total thickness) of the first protrusion 42 in the extending direction of the positive electrode lead 21a (positive electrode current collector 28). Yes. Therefore, the tip (tip) of the first protrusion 42 has a linear shape extending along the extending direction of the positive electrode lead 21a.

  In the first terminal member 40, the first side surface 41 a of the main body 41 and the first end surface 42 a serving as the rear end surface of the first protrusion 42 are formed flush with each other. That is, the first side surface 41a of the main body 41 and the first end surface 42a of the first protrusion 42 are continuous and parallel.

  Each second protrusion 43 is formed on the first end face 42a (first protrusion 42) side, and the third end face 43a, which is a rear end face parallel to the first end face 42a, and the third end face The fourth end surface 43b, which is the opposite end surface (front end surface), and the second connecting portion 43c that connects the end portions of the third end surface 43a and the fourth end surface 43b on the tip end side of the second protrusion 43 are connected to each other. .

  The third end surface 43a is formed on the same side as the first side surface 41a of the main body 41, and the fourth end surface 43b is formed on the same side as the second side surface 41b. Further, the second connecting portion 43 c formed at the distal end of each second projecting portion 43 is directed from the distal end side of the second projecting portion 43 toward the proximal end portion side toward the first side surface 41 a side of the main body portion 41. An inclined second inclined portion 43d is formed. The second inclined portion 43d has an acute angle with the fourth end surface 43b.

  The second inclined portion 43 d formed on each second protrusion 43 is formed across the entire width of the second protrusion 43 in the stacking direction of the electrode body 25. That is, the width in the stacking direction of the electrode body 25 in the second inclined portion 43d is formed to exceed half of the length in the stacking direction of the second protrusion 43. Further, the second inclined portion 43d formed on the second protrusion 43 is formed over the entire width (total thickness) of the second protrusion 43 in the extending direction of the positive electrode lead 21a. Therefore, the tip (tip portion) of the second protrusion 43 has a linear shape extending along the extending direction of the positive electrode lead 21a.

  The second terminal member 50 includes a main body 51 having a substantially rectangular flat plate shape arranged along the upper end surface 25 a of the electrode body 25. The main body 51 has third side surfaces 51a that are side surfaces (rear end surfaces) located at both ends of the electrode body 25 in the stacking direction and parallel to the layers (the positive electrode sheet 21 and the negative electrode sheet 22) in the electrode body 25. The fourth side surface 51b, which is the side surface (front end surface) opposite to the third side surface 51a, is formed. The third side surface 51 a is formed on the same side as the first side surface 41 a in the main body portion 41, and the fourth side surface 51 b is formed on the same side as the second side surface 41 b in the main body portion 41.

  In addition, a positive electrode lead 21 a (positive electrode sheet 21) toward the first terminal member 40 is formed on the second base end portion 51 c which is a side surface arranged on the first terminal member 40 side among the outer peripheral end surfaces of the main body 51. ) One third projecting portion 52 and two fourth projecting portions 53 extending along the surface direction. The third protrusions 52 and the fourth protrusions 53 are both formed in a square bar shape and are parallel to each other. In the second terminal member 50, the third protrusion 52 is formed at the front end of the main body 51 that is the other end of the electrode body 25 in the stacking direction.

  The third projecting portion 52 includes a fifth end surface 52a serving as a front end surface of the third projecting portion 52, a sixth end surface 52b serving as an end surface (rear end surface) opposite to the fifth end surface 52a, a fifth end surface 52a, and It is comprised by the 3rd connection part 52c which connects the edge parts by the side of the tip of the 3rd projection part 52 in the 6th end surface 52b. The third connecting portion 52c formed at the distal end of the third projection 52 is inclined toward the third side surface 51a of the main body 51 from the distal end side to the proximal end side of the third projection portion 52. Three inclined portions 52d are formed. The third inclined portion 52d has an acute angle with the fifth end surface 52a.

  The third inclined portion 52 d formed on the third protrusion 52 is formed over the entire width of the third protrusion 52 in the stacking direction of the electrode body 25. Further, the third inclined portion 52d formed in the third protrusion 52 is formed over the entire width (total thickness) of the third protrusion 52 in the extending direction of the positive electrode lead 21a (positive electrode current collector 28). Yes. Therefore, the tip (tip) of the third protrusion 52 has a linear shape extending along the extending direction of the positive electrode lead 21a.

  In the second terminal member 50, the fourth side surface 51 b of the main body 51 and the fifth end surface 52 a serving as the front end surface of the third protrusion 52 are formed flush with each other. That is, the fourth side surface 51b of the main body 51 and the fifth end surface 52a of the third protrusion 52 are continuous and parallel.

  Each fourth projection 53 is formed on the fifth end surface 52a (third projection 52) side, and is a seventh end surface 53a that is a front end surface parallel to the fifth end surface 52a, and is opposite to the seventh end surface 53a. 8th end surface 53b which is a side end surface (rear end surface), and the 4th connection part 53c which connects the edge part of the front end side of the 4th projection part 53 in the 7th end surface 53a and the 8th end surface 53b.

  The seventh end surface 53a is formed on the same side as the fourth side surface 51b of the main body 51, and the eighth end surface 53b is formed on the same side as the third side surface 51a. Further, the fourth connecting portion 53 c formed at the distal end of each fourth projecting portion 53 is directed from the distal end side of the fourth projecting portion 53 toward the proximal end portion side toward the fourth side surface 51 b side of the main body portion 51. An inclined fourth inclined portion 53d is formed. The fourth inclined portion 53d has an acute angle with the eighth end surface 53b. Therefore, in the present embodiment, the second inclined portion 43d and the fourth inclined portion 53d are inclined in the same direction. More specifically, the second inclined portion 43d and the fourth inclined portion 53d of the present embodiment are formed in parallel.

  And the 4th inclination part 53d formed in each 4th projection part 53 is formed over the full width of the 4th projection part 53 in the lamination direction in the electrode body 25, respectively. In other words, the width of the fourth inclined portion 53d in the stacking direction in the electrode body 25 is formed to exceed half the length of the fourth protrusion 53 in the stacking direction. Further, the fourth inclined portion 53d formed on the fourth protrusion 53 is formed over the entire width (total thickness) of the fourth protrusion 53 in the extending direction of the positive electrode lead 21a. Therefore, the tip (tip) of the fourth protrusion 53 has a linear shape extending along the extending direction of the positive electrode lead 21a.

  In the present embodiment, the first base end 41 c, the first protrusion 42, and the second protrusion 43 formed on the first terminal member 40 are the second base end formed on the second terminal member 50. The portion 51c, the third protrusion 52, and the fourth protrusion 53 have the same shape.

  Also, adjacent first and second protrusions 42 and 43, second and fourth protrusions 43 and 43, third and fifth protrusions 52 and 53, and fourth and fourth protrusions 53 and 43, respectively. The separation distance in the front-rear direction of the portion 53 is slightly larger than the width of the second protrusion 43 and the fourth protrusion 53 in the front-rear direction.

  Further, in a state where the terminal members 40 and 50 are combined, the tip of the third protrusion 52 (third inclined portion 52d) and the tip of the fourth protrusion 53 (fourth inclined portion) formed on the second terminal member 50. 53d) is separated from the first base end portion 41c in which the first protrusion 42 and the second protrusion 43 are formed in the first terminal member 40. Further, the tip of the first protrusion 42 (first inclined portion 42 d) and the tip of the second protrusion 43 (second inclined portion 43 d) formed on the first terminal member 40 and the second terminal member 50 are third. The second base end portion 51c on which the protrusion 52 and the fourth protrusion 53 are formed is separated.

  And each terminal member 40,50 is the 1st projection part 42, the 4th projection part 53, and the 1st end surface 42a side (1st side surface 41a and 3rd side surface 51a) in the lamination direction of the electrode body 25, and The 2nd protrusion part 43 is arrange | positioned in order. Further, in the stacking direction, the third protrusion 52, the second protrusion 43, and the fourth protrusion 53 are sequentially arranged from the fifth end face 52a side (the second side face 41b side and the fourth side face 51b side). ing.

  For this reason, in the state which combined the 1st terminal member 40 and the 2nd terminal member 50, between the 1st projection part 42 and the 4th projection part 53, between the 2nd projection part 43 and the 4th projection part 53 A gap (clearance) is formed between the second protrusion 43 and the third protrusion 52. In each of these gaps, each positive electrode lead 21a (layer) constituting the positive electrode current collector 28 has a plurality of bundles (five in this embodiment) for each of a plurality (a plurality of layers) in the stacking direction. In such a state, each gap is arranged so as to be inserted in the extending direction (vertical direction) of the positive electrode lead 21a. In the present embodiment, each gap formed between adjacent projecting portions of the counterpart terminal member is based on the total thickness of each positive electrode lead 21a (metal foil 26) sandwiched in each gap. Is also slightly wider.

  The first protrusion 42 (second end face 42 b) formed on the first terminal member 40 is formed by the first protrusion 42 on the first terminal member 40 among the end faces in the stacking direction of the positive electrode current collector 28. It is in contact with the end face 36a on the end part side (rear end part side). The fourth protrusion 53 (sixth end surface 52 b) formed on the second terminal member 50 is the end of the positive electrode current collector 28 in the stacking direction, and the fourth protrusion 53 is formed on the second terminal member 50. It is in contact with the end surface 36b on the end side (front end side). As described above, the second terminal member 50 of the present embodiment is in contact (continuous) with the first terminal member 40 via the positive electrode lead 21a.

  In the present embodiment, the first base end 41c, which is the base end of the first protrusion 42 and the second protrusion 43, the first protrusion 42, and the second protrusion 43 are in contact with the positive electrode lead 21a. The contact area 37 is formed. Similarly, in the present embodiment, the second base end portion 51c, which is the base end portion of the third protrusion portion 52 and the fourth protrusion portion 53 formed on the second terminal member 50, the third protrusion portion 52, and the The four protrusions 53 form a contact region 37 in contact with the positive electrode lead 21a. In the present embodiment, the shape of the contact region 37 is the same for the first terminal member 40 and the second terminal member 50.

  In the present embodiment, the first terminal member 40, the second terminal member 50, and the positive electrode current collector 28 (positive electrode lead 21a) are joined (welded) to each other by resistance welding. More specifically, the positive electrode lead 21a overlaps the first protrusion 42, the second protrusion 43, the third protrusion 52, and the fourth protrusion 53 when viewed from the stacking direction of the electrode body 25 ( It is welded in the area where it is polymerized (shown in black in the figure).

  Next, a method for manufacturing the secondary battery 10 will be described with reference to FIGS. In the following description, a method for manufacturing the current collector terminal 30 and a method for connecting the current collector terminal 30 and the positive electrode current collector 28 (positive electrode lead 21a) will be described in detail, and the current collector terminal only in terms of copper. Description of the manufacturing method of the current collecting terminal 31 different from 30 and the method of connecting the current collecting terminal 31 and the negative electrode current collecting portion 29 are simplified or omitted.

  As shown in FIG. 4, the first terminal member 40 and the second terminal member 50 for constituting the current collecting terminal 30 are formed by cutting one rectangular metal plate (in this embodiment, an aluminum plate) with a laser processing machine. (Laser cut). At this time, in the present embodiment, as shown in FIG. 4A, a single metal plate is cut along a continuous cutting line L (shown by a broken line) to obtain FIG. As shown in FIG. 3, the terminal members 40 and 50 having the same shape in the contact region 37 are formed.

  Therefore, in this embodiment, compared with the case where each terminal member 40 and 50 is formed (manufactured) individually, each terminal member 40 and 50 can be easily formed, and loss of material can be suppressed. Here, the output of the laser beam used for cutting the metal plate has a gap slightly wider than the total thickness of the sandwiched positive electrode lead 21a (metal foil 26), and the first protrusion 42 and the fourth protrusion 53, The output is formed between the second protrusion 43 and the third protrusion 52 and between the second protrusion 43 and the fourth protrusion 53.

  Then, the positive terminal 15 is joined to the main body 41 of the first terminal member 40 by welding or the like. Similarly, for the current collecting terminal 31 for the negative electrode, a rectangular metal plate (a copper plate in the present embodiment) is cut by a laser processing machine to form the terminal members 40 and 50, and the first terminal member 40. The negative terminal 16 is joined to the main body 41 by welding or the like.

  In addition, the positive electrode sheet 21 and the negative electrode sheet 22 are laminated in the front-rear direction (thickness direction) with the separator 23 sandwiched therebetween to form the electrode body 25. As shown in FIG. 5A, in a state in which the positive electrode sheet 21 and the negative electrode sheet 22 are laminated, the positive electrode lead 21a forming the positive electrode current collector 28 is not divided in the lamination direction in the electrode body 25. It is said that.

  Next, in the surface direction of the positive electrode lead 21a (positive electrode sheet 21) forming the positive electrode current collector 28, the first base end from the direction (here, the left-right direction) orthogonal to the extending direction of the positive electrode lead 21a. With the portion 41c and the second base end portion 51c facing each other, the terminal members 40 and 50 are disposed so as to sandwich the positive electrode current collector 28. At this time, the first protrusions 42 and the third protrusions 52 formed on the terminal members 40 and 50 are arranged outside the positive electrode current collector 28 in the stacking direction of the electrode body 25, respectively. Then, the respective terminal members 40 and 50 are moved in directions close to each other, and the second projecting portion 43 and the fourth projecting portion 53 are inserted between the positive electrode leads 21a (indicated by a two-dot chain line).

  At this time, as shown in FIG. 5 (b), each of the terminal members 40 and 50 includes the second inclined portion 43 d formed on the second protruding portion 43 and the fourth inclined portion 53 d formed on the fourth protruding portion 53. Are moved in directions close to each other while being moved along each other. In the first terminal member 40, the second protrusion 43 formed adjacent to the first protrusion 42 is formed between the third protrusion 52 and the fourth protrusion 53 formed on the other second terminal member 50. To insert. In other words, in the second terminal member 50, the fourth protrusion 53 formed adjacent to the third protrusion 52 is replaced with the first protrusion 42 and the second protrusion 43 formed on the other first terminal member 40. Insert between. Thereby, each terminal member 40 and 50 is relatively moved (skewed) in the direction in which the first protrusion 42 and the third protrusion 52 are close to each other in the front-rear direction (indicated by an arrow Y4).

  Therefore, between the first protrusion 42 and the fourth protrusion 53, between the third protrusion 52 and the second protrusion 43, and between the second protrusion 43 and the fourth protrusion 53, The positive electrode lead 21a is arranged so as to be sandwiched while being divided. Therefore, the work of dividing the positive electrode lead 21a constituting the positive electrode current collector 28 into a plurality of bundles, and the current collector terminals 31 (terminal members 40, 50) are assembled (arranged) to the positive electrode current collector 28. Since the operation can be performed at the same time, the process can be simplified.

  In particular, the second inclined portion 43d of the present embodiment is formed in the second protrusion 43 where the second inclined portion 43d is formed so as to exceed half the length in the stacking direction of the electrode body 25. Further, the fourth inclined portion 53d is formed in the fourth protruding portion 53 where the fourth inclined portion 53d is formed so as to exceed half the length in the stacking direction of the electrode body 25. Therefore, as in the present embodiment, the length (thickness) in the stacking direction of the positive electrode current collector 28 (electrode body 25) is the length in the stacking direction of the first terminal member 40 and the second terminal member 50. Even in the case where the width is larger than the width, the number of positive (multiple) layers between the terminal members 40 and 50 is increased by the formation range of the second inclined portion 43d and the fourth inclined portion 53d in the stacking direction of the electrode body 25. The electrode lead 21a can be sandwiched.

  Here, from the viewpoint of improving the energy density (volume energy density and weight energy density) in the secondary battery 10, it can be said that it is preferable to make each of the current collecting terminals 30 and 31 as small as possible. For example, the current collecting terminals 30 and 31 can be downsized and the energy density of the secondary battery 10 can be improved by reducing the width of each terminal member 40 and 50 in the front-rear direction (stacking direction in the electrode body 25). It seems possible. However, when the width in the front-rear direction of each terminal member 40, 50 is simply formed small, the positive electrode current collector 28 having a thickness exceeding the width in the front-rear direction of each terminal member 40, 50 cannot be sandwiched. There is.

  On the other hand, in this embodiment, the 2nd inclination part 43d and the 4th inclination part 53d are formed exceeding the half of the width | variety of the front-back direction in the 2nd protrusion part 43 and the 4th protrusion part 53, respectively. For this reason, by moving the terminal members 40 and 50 in directions close to each other while keeping the second inclined portion 43d and the fourth inclined portion 53d along each other, the front and rear direction of each inclined portion 43d and 53d is increased. Each terminal member 40, 50 can be moved in the direction (front-rear direction) in which the first protrusion 42 and the third protrusion 52 approach each other by the width. At this time, the first electrode portion 42 and the third protrusion portion 52 can gather the positive electrode leads 21a constituting the positive electrode current collector 28 in the front-rear direction. As described above, in the present embodiment, more than half of the width in the front-rear direction of each protrusion 43, 53, more specifically, the width of each of the inclined members 43d, 53d is equal to the width in the front-rear direction. The positive electrode current collector 28 having a thickness larger than the width in the front-rear direction can be sandwiched.

  The inclined portions 42d, 43d, 52d, and 53d are formed at the tips of the protruding portions 42, 43, 52, and 53, respectively. For this reason, when inserting the 2nd protrusion part 43 and the 4th protrusion part 53 between the positive electrode leads 21a compared with the structure which does not provide an inclination part at the front-end | tip of each protrusion part 42,43,52,53. Further, the positive electrode lead 21a can be prevented from being damaged by the tips (tips) of the projections 43 and 53 coming into contact with the edge of the positive electrode lead 21a.

  In the present embodiment, the first inclined portion 42d of the first protruding portion 42 and the second inclined portion 43d of the second protruding portion 43 are separated from the second base end portion 51c. Similarly, in the present embodiment, the third inclined portion 52d of the third protruding portion 52 and the fourth inclined portion 53d of the fourth protruding portion 53 are separated from the first base end portion 41c of the first terminal member 40. To. Accordingly, the positive electrode lead 21a can be easily sandwiched by the elasticity (deflection) of the protrusions 42, 43, 52, 53. Therefore, the positive electrode lead 21a can be disposed so as to be securely sandwiched between the protrusions 42, 43, 52, 53.

  Next, in a state where the positive electrode lead 21a is sandwiched between the protrusions 42, 43, 52, and 53, the protrusions 42, 43, 52, and 53 (terminal members 40 and 50) are formed in a rod shape. The pair of electrodes 38 is sandwiched with a predetermined load from both sides of the electrode body 25 in the stacking direction (front-rear direction), and the protrusions 42, 43, 52, 53 and the positive electrode lead 21a are brought into close contact with each other. Then, with the projections 42, 43, 52, 53 and the positive electrode lead 21a being in close contact with each other, current is passed between the electrodes 38 to provide the projections 42, 43, 52, 53 and the positive electrode lead 21a. Are welded and joined. As described above, the positive electrode current collector 28 and the current collector terminal 30 are electrically connected.

  In the present embodiment, the positive electrode lead 21a (metal foil 26), the first terminal member 40, and the second terminal member 50 are all formed of the same metal (aluminum). For this reason, each terminal member 40 and 50 and the positive electrode lead 21a can be easily joined by performing resistance welding in a state where the positive electrode lead 21a is sandwiched between the terminal members 40 and 50. The same applies to the joining of the negative electrode current collector 29 and the current collector terminal 31 (the terminal members 40 and 50).

  The electrode body 25 is housed in the main body member 12 in a state of being housed in the insulating bag 11a, and the lid member 13 is assembled to the main body member 12 with the positive electrode terminal 15 and the negative electrode terminal 16 protruding from the upper surface. Finally, the secondary battery 10 is completed by being filled with an electrolyte (electrolytic solution).

Therefore, according to the present embodiment, the following effects can be obtained.
(1) The second inclined portion 43d and the fourth inclined portion 53d are formed in each protrusion 43, 53 so as to exceed half of the length (width) in the stacking direction of the electrode body 25. For this reason, even when the length (thickness) in the stacking direction of the electrode body 25 is larger than the length (width) of the terminal members 40 and 50 in the stacking direction as in the present embodiment, the electrode The multilayer positive electrode lead 21a can be sandwiched between the terminal members 40 and 50 by the formation range of the inclined portions 43d and 53d in the stacking direction of the body 25. Therefore, the positive electrode current collector 28 and the current collector terminal 30 can be easily connected. The same applies to the connection (bonding) between the negative electrode current collector 29 and the current collector terminal 31.

  (2) Each inclined part 42d, 43d, 52d, 53d is formed at the tip of the corresponding protrusion. For this reason, when inserting the 2nd protrusion part 43 and the 4th protrusion part 53 between the positive electrode leads 21a compared with the structure which does not provide an inclination part in the front-end | tip part of each protrusion part 42,43,52,53. In addition, it is possible to prevent the positive electrode lead 21a from being damaged by the tips of the second protrusion 43 and the fourth protrusion 53 coming into contact with the edge of the positive electrode lead 21a. The same applies to the connection between the negative electrode current collector 29 and the current collector terminal 31.

  (3) The tips of the projections 42 and 43 formed on the first terminal member 40 are separated from the second base end portion 51 c of the second terminal member 50 and the projections formed on the second terminal member 50. The distal ends of the portions 52 and 53 are separated from the first base end portion 41 c of the first terminal member 40. For this reason, the positive electrode lead 21a can be easily sandwiched by the elasticity of the protrusions 42, 43, 52, and 53. Therefore, the positive electrode lead 21a can be disposed so as to be securely sandwiched between the protrusions 42, 43, 52, 53. The same applies to the connection between the negative electrode current collector 29 and the current collector terminal 31.

  (4) The shape of the contact region 37 in contact with the positive electrode sheet 21 is the same for the first terminal member 40 and the second terminal member 50. For this reason, each terminal member 40 and 50 can be simply formed compared with the case where the shape of the contact region 37 with the positive electrode lead 21a is formed in a shape different from each terminal member 40 and 50.

(5) The positive electrode lead 21a (metal foil 26), the first terminal member 40, and the second terminal member 50 are all formed of the same metal (aluminum). For this reason, each terminal member 40 and 50 and the positive electrode lead 21a can be easily joined by performing resistance welding in a state where the positive electrode lead 21a is sandwiched between the terminal members 40 and 50. The same applies to the connection between the negative electrode current collector 29 and the current collector terminal 31.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same reference numerals are given to the same configurations as those of the already described embodiments, and the overlapping description is omitted or simplified.

  As shown in FIG. 6A and FIG. 6B, in the secondary battery 10 of the present embodiment, each positive electrode lead 21 a constituting the positive electrode current collector 28 and each constituting the negative electrode current collector 29. The negative electrode lead 22a is different from the first embodiment in that the shape of the negative electrode lead 22a is a trapezoidal shape (substantially trapezoidal). In the following description, the positive electrode current collector 28 will be described in detail, and the description of the negative electrode current collector 29 configured symmetrically with the positive electrode current collector 28 will be omitted.

  Each positive electrode lead 21a constituting the positive electrode current collector 28 is formed in the surface direction of the positive electrode sheet 21 (positive electrode lead 21a) from the upper edge portion 26a on which the positive electrode lead 21a is extended and formed upward. The first edge 39a and the second edge 39b in the left-right direction are slanted so that the length (width) in the direction (left-right direction) orthogonal to the extending direction of the positive electrode lead 21a is gradually reduced. Has been.

  As described above, the tips of the protrusions 42, 43, 52, and 53 are formed in a linear shape extending along the extending direction (vertical direction) of the positive electrode lead 21a. Therefore, in the direction in which the protrusions 42, 43, 52, 53 extend, the first base end portion 41c of the protrusions 42, 43 formed on the first terminal member 40, of the edge of the positive electrode lead 21a. The first edge 39 a disposed on the side is inclined with respect to the tip (tip) of the second protrusion 43. Similarly, the second edge 39b disposed on the second base end 51c side of each of the protrusions 52 and 53 formed on the second terminal member 50 among the edges of the positive electrode lead 21a is a fourth protrusion. The portion 53 is inclined with respect to the tip (tip).

Next, the operation of the secondary battery 10 configured as described above will be described.
In the present embodiment, the first edge 39a of each positive electrode lead 21a is inclined with respect to the tip of the second protrusion 43 formed on the first terminal member 40, and the second edge 39b is The second terminal member 50 is inclined with respect to the distal end portion of the fourth protrusion 53 formed on the second terminal member 50. Therefore, when the tip of the second protrusion 43 is inserted between the positive electrode leads 21a, the area where the tip contacts the first edge 39a of the positive electrode lead 21a can be reduced. Similarly, when the tip of the fourth protrusion 53 is inserted between the positive electrode leads 21a, the area where the tip contacts the second edge 39b of the positive electrode lead 21a can be reduced. That is, in the present embodiment, the second projecting portion 43 and the fourth projecting portion 53 are moved from the state where the tip portions of the second projecting portion 43 and the fourth projecting portion 53 are in point contact with the respective edge portions 39a and 39b. It can be inserted between the positive electrode leads 21a.

  For example, when the edge of the positive electrode lead 21a and the tip of the second protrusion 43 and the fourth protrusion 53 are parallel, the edge of the positive electrode lead 21a and the protrusions 43 and 53 are provided. There is a possibility that the leading end of the lead electrode 21a may be damaged when the projections 43 and 53 are inserted between the positive electrode leads 21a. On the other hand, in the present embodiment, the first edge portion 39a and the second edge portion 39b of the positive electrode lead 21a are inclined with respect to the distal end portions of the protrusion portions 43 and 53, respectively, thereby causing the protrusion portions 43 and 53 to be inclined. Can be suitably prevented from being damaged when the electrode is inserted between the positive electrode leads 21a.

Therefore, according to this embodiment, in addition to the effects (1) to (5) of the first embodiment, the following effects can be obtained.
(6) The first edge 39a of each positive electrode lead 21a is inclined with respect to the tip of the second protrusion 43 formed on the first terminal member 40, and the second edge 39b is It is inclined with respect to the tip end portion of the fourth protrusion 53 formed on the two-terminal member 50. For this reason, when inserting the front-end | tip part of the 2nd projection part 43 between the positive electrode leads 21a, the area which the said front-end | tip part contact | abuts with the 1st edge part 39a of the positive electrode lead 21a can be made small. Similarly, when the distal end portion of the fourth protrusion 53 formed on the second terminal member 50 is inserted between the positive electrode leads 21a, the distal end portion comes into contact with the second edge 39b of the positive electrode lead 21a. The area can be reduced. Therefore, damage to the positive electrode lead 21a when the second protrusion 43 and the fourth protrusion 53 are inserted between the positive electrode leads 21a can be suppressed.

The embodiment is not limited as described above, and may be embodied as follows, for example.
As shown in FIG. 7, the positive electrode lead 21a and the negative electrode lead 22a may be formed in a parallelogram shape in which the first edge portion 39a and the second edge portion 39b are parallel to each other. That is, the first edge 39a of each positive electrode lead 21a is inclined with respect to the tip of the second protrusion 43 formed on the first terminal member 40, and the second edge 39b is the second edge 39b. What is necessary is just to incline with respect to the front-end | tip part of the 4th projection part 53 formed in the terminal member 50. FIG. The same applies to the negative electrode current collector 29.

O As shown in FIG. 7, you may reinforce by providing the R part 39c in the base end part of the 2nd edge part 39b. Similarly, an R portion 39c may be provided at the proximal end portion of the first edge portion 39a.
As shown in FIGS. 8A and 8B, each of the second protrusions 43 has a positive electrode lead 21a (or a negative electrode lead 22a) in addition to the second inclined portion 43d at the tip. A fifth inclined surface 43e having a surface inclined in the extending direction (vertical direction) may be provided to form a tapered shape. In FIG. 8, only one second protrusion 43 and one fourth protrusion 53 are shown, and other members are not shown. More specifically, each second protrusion 43 connects the third end surface 43a and the fourth end surface 43b, and the first lower surface 43f formed on the electrode body 25 side is opposite to the first lower surface 43f. The first upper surface 43g is formed. A fifth inclined surface 43e is formed at the tip of the second protrusion 43 so as to continue the first lower surface 43f and the first upper surface 43g. The fifth inclined surface 43e may have an acute angle with the first lower surface 43f or the first upper surface 43g.

  In addition to the fourth inclined portion 53d, each fourth protruding portion 53 has a planar shape inclined further in the extending direction (vertical direction) of the positive electrode lead 21a (or the negative electrode lead 22a). A sixth inclined surface 53e may be provided to form a tapered shape. More specifically, each fourth projection 53 is connected to the seventh end surface 53a and the eighth end surface 53b, and the second lower surface 53f formed on the electrode body 25 side is opposite to the second lower surface 53f. The second upper surface 53g is formed. A sixth inclined surface 53e is formed at the distal end portion of the fourth protrusion 53 so as to continue the second lower surface 53f and the second upper surface 53g. The sixth inclined surface 53e may have an acute angle with the second lower surface 53f or the second upper surface 53g.

  Further, the tip portions of the second protrusion 43 and the fourth protrusion 53 are formed in a conical shape, and the second inclined portion 43d and the fifth inclined surface 43e, and the fourth inclined portion 53d and the sixth inclined surface 53e are continuous. You may form so that it may do. The first protrusion 42 and the third protrusion 52 can be similarly changed. Thereby, each protrusion part 42,43,52,53 can be made into the shape where the cross-sectional area along the lamination direction in the electrode body 25 becomes small from a base end part to a front-end | tip part.

  In the current collecting terminal 30, the main body 51 and the positive terminal 15 of the second terminal member 50 may be directly welded. In the current collecting terminal 31, the main body 51 and the negative terminal 16 are directly welded. May be.

  ○ Of each terminal member 40, 50, a protrusion may be provided on one side, a recess may be provided on the other, and the terminal members 40, 50 may be fixed to each other by engaging the protrusion and the recess. .

Each inclined part 42d, 43d, 52d, 53d may be formed on the base end side of the corresponding protrusion.
In the first embodiment, if the second inclined portion 43d and the fourth inclined portion 53d are formed over a range that exceeds half of the length in the stacking direction of the electrode body 25 in each of the protruding portions 43 and 53, respectively. The formation range may be changed. For example, the second protrusion 43 and the fourth protrusion 53 may be formed over a range of three quarters of the length (width) in the stacking direction.

  In the second embodiment, the second inclined portion 43d and the fourth inclined portion 53d may be formed over a range that is half or less of the length in the stacking direction of the electrode body 25 in each of the protrusions 43 and 53, respectively. Good. However, from the viewpoint of easily connecting the positive electrode current collector 28 and the current collector terminal 30 and the negative electrode current collector 29 and the current collector terminal 31, it is preferable to configure as in the above embodiment.

Each terminal member 40, 50 may be formed by press working or the like.
Each terminal member 40, 50 may be formed from a separate metal plate.
Each terminal member 40 and 50 does not need to be formed in the same shape in the contact region 37. That is, if each terminal member 40,50 is a shape which can pinch | interpose the positive electrode lead 21a and the negative electrode lead 22a, it changes suitably the shape of each projection part 42,43,52,53 and the main-body parts 41,51. May be. The connection (bonding) between the negative electrode current collector 29 and the current collector terminal 31 can be similarly changed.

  ○ The first terminal member 40 may be formed with one or three or more second protrusions 43, and the second terminal member 50 may be formed with one or three or more fourth protrusions 53. May be. In this case, the positive electrode lead 21a constituting the positive electrode current collector 28 may be divided and sandwiched according to the number of gaps formed between the terminal members 40 and 50. The connection (bonding) between the negative electrode current collector 29 and the current collector terminal 31 can be similarly changed.

  O It is good also as a structure which does not arrange | position the positive electrode lead 21a in some clearance gaps among the clearance gaps formed between each terminal members 40 and 50. FIG. In this case, in the gap where the positive electrode lead 21a is not disposed, the terminal members 40 and 50 are brought into contact (continuous) and joined without the positive electrode sheet 21 interposed therebetween. The connection (bonding) between the negative electrode current collector 29 and the current collector terminal 31 can be similarly changed.

  Each terminal member 40, 50 and the positive electrode current collector 28 (positive electrode lead 21a) may be joined by a welding method different from resistance welding. Alternatively, the positive electrode current collector 28 (positive electrode lead 21a) may be simply sandwiched between the terminal members 40 and 50. The junction between the negative electrode current collector 29 and the current collector terminal 31 can be similarly changed.

  Each terminal member 40 and 50 which comprises the current collection terminal 30 may be formed with the metal different from the metal foil 26 which comprises the positive electrode lead 21a. Moreover, each terminal member 40 and 50 which comprises the current collection terminal 30 may be formed from a respectively different metal, and also the 2nd terminal member 50 may be formed with insulating materials, such as resin. The current collecting terminal 31 can be similarly changed.

  The electrode body 25 is formed by forming the positive electrode sheet 21, the negative electrode sheet 22, and the separator 23 into a long sheet shape (band shape) and sandwiching the separator 23 therebetween, and the positive electrode sheet 21 and the negative electrode The sheet 22 may be wound in a spiral shape so that the positive electrode sheet 21 and the negative electrode sheet 22 have a layered structure (laminated structure). In this case, in the positive electrode sheet 21, one end portion (left end portion in this example) in the width direction (left-right direction) extends in the width direction so as to extend at a predetermined interval along the length direction of the positive electrode sheet 21. A positive electrode lead 21a that protrudes to the outside (left side) is provided. On the other hand, in the negative electrode sheet 22, the other end in the width direction (the right end in the present example) extends outside in the width direction so as to extend at a predetermined interval along the length direction of the negative electrode sheet 22 ( A negative electrode lead 22a protruding to the right) is provided. Then, by winding the positive electrode sheet 21 and the negative electrode sheet 22, the positive electrode current collector portion 28 in which a plurality of positive electrode leads 21 a form a layer shape is formed on the left end portion of the electrode body 25. A negative electrode current collector 29 in which a plurality of negative electrode leads 22a form a layer shape may be formed at the right end.

The electrode body 25 may be laminated by folding the positive electrode sheet 21 and the negative electrode sheet 22 in a bellows shape with the separator 23 interposed therebetween.
Although the metal foil 26 is used as the metal thin plate (metal sheet), it may be a thin plate having a thickness that does not affect the battery capacity reduction or the battery production.

The shape of the case 11 (main body member 12) may be formed in a columnar shape or an elliptical column shape that is flat in the left-right direction.
In the above embodiment, the parallel or orthogonal does not necessarily mean completely parallel or orthogonal, and the electrode body 25, the metal foil 26, or the protrusions 42, 43, 52, and 53 are determined from the parallel or orthogonal positional relationship. The range of the degree of elastic deformation is included in these.

  ○ The secondary battery 10 of the above embodiment is mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle), and is charged by a generator mounted on the vehicle, while the compressor for an air conditioner is supplied with electric power supplied from the secondary battery 10 Alternatively, an electric motor for driving the wheels or an electrical component such as a car navigation system may be driven. According to this, as the secondary battery 10, the positive electrode lead 21a and the negative electrode lead 22a are prevented from being damaged, and the positive electrode current collector 28 and the current collector terminal 30 and the negative electrode current collector 29 and the current collector terminal 31 are easily provided. Therefore, the time required for manufacturing the vehicle including the secondary battery 10 can be shortened.

  The present invention may be embodied as an electric double layer capacitor as a power storage device.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery (electric storage apparatus), 15 ... Positive electrode terminal (electrode terminal), 16 ... Negative electrode terminal (electrode terminal), 21 ... Positive electrode sheet (electrode sheet), 21a ... Positive electrode lead (uncoated part), 22 ... Negative electrode sheet (electrode sheet), 22a ... Negative electrode lead (uncoated part), 25 ... Electrode body, 25a ... Upper end surface (end surface), 25b ... Lower end surface (end surface), 26 ... Metal foil, 27a ... Coating part, 28 ... Positive current collecting part (current collecting part), 29 ... Negative electrode current collecting part (current collecting part), 30 ... Current collecting terminal (current collecting member), 31 ... Current collecting terminal (current collecting member), 39a ... 1st edge part, 39b ... 2nd edge part, 40 ... 1st terminal member (1st member), 41a ... 1st side surface, 41b ... 2nd side surface, 41c ... 1st base end part, 42 ... 1st Projection, 42a ... first end surface, 42b ... second end surface, 42c ... first connecting portion, 42d ... first inclined portion, 43 ... second projection, 43a 3rd end surface, 43b ... 4th end surface, 43c ... 2nd connection part, 43d ... 2nd inclined part, 43e ... 5th inclined surface, 43f ... 1st lower surface, 43g ... 1st upper surface, 50 ... 2nd terminal member ( 2nd member), 51a ... 3rd side surface, 51b ... 4th side surface, 51c ... 2nd base end part, 52 ... 3rd projection part, 52a ... 5th end surface, 52b ... 6th end surface, 52c ... 3rd connection part , 52d ... third inclined portion, 53 ... fourth protrusion, 53a ... seventh end surface, 53b ... eighth end surface, 53c ... fourth connecting portion, 53d ... fourth inclined portion, 53e ... sixth inclined surface, 53f ... 2nd lower surface, 53g ... 2nd upper surface.

Claims (11)

An electrode body having a layered structure in which a plurality of electrode sheets each having a metal thin plate, a coated portion where an active material is applied to the surface of the metal thin plate, and an uncoated portion where the active material is not applied;
A current collector formed extending from one edge of the electrode body, and a plurality of uncoated portions of the electrode sheets are stacked to form a layered structure;
An electrode terminal for extracting power from the electrode body;
A power storage device having a current collecting member that electrically connects the current collecting part and the electrode terminal,
End faces extending along the laminating direction are formed at both ends of the electrode body in the laminating direction, respectively.
The current collecting member has a first member and a second member arranged on one end face of the both end portions and arranged in a direction orthogonal to the stacking direction of the electrode body,
In the first member, a first side surface that is a side surface parallel to the layer in the electrode body and a second side surface that is a side surface opposite to the first side surface are formed, respectively.
The first member is electrically connected to the electrode terminal;
The first member is formed with a first protrusion protruding toward the second member and at least one second protrusion,
The first protrusion is at least
A first end surface continuous with the first side surface and parallel to the first side surface;
A second end surface which is an end surface opposite to the first end surface;
The first end surface and the second end surface are configured by a first connecting portion that connects end portions on the distal end side of the first projecting portion,
The first connecting portion has a first inclined portion;
The first inclined portion forms an acute angle with the first end surface;
The second protrusion is at least
A third end face formed on the first end face side and parallel to the first end face;
A fourth end surface that is an end surface opposite to the third end surface;
The third end surface and the fourth end surface are configured by a second connecting portion that connects end portions on the distal end side of the second projecting portion,
The second connecting part has a second inclined part,
The second inclined portion forms an acute angle with the fourth end surface;
The second member has a third side surface that is a side surface parallel to the layer in the electrode body, and a fourth side surface that is a side surface opposite to the third side surface, respectively.
The third side surface is formed on the same side as the first side surface, and the fourth side surface is formed on the same side as the second side surface,
The second member is continuous with the first member directly or through the uncoated portion forming the current collector,
The second member is formed with a third protrusion that protrudes toward the first member, and at least one fourth protrusion.
The third protrusion is at least
A fifth end surface that is continuous with the fourth side surface and parallel to the fourth side surface;
A sixth end surface which is an end surface opposite to the fifth end surface;
The fifth end surface and the sixth end surface are configured by a third connecting portion that connects end portions on the distal end side of the third projecting portion,
The third connecting portion has a third inclined portion;
The third inclined portion forms an acute angle with the fifth end surface;
The fourth protrusion is at least
A seventh end surface formed on the fifth end surface side and parallel to the fifth end surface;
An eighth end surface which is an end surface opposite to the seventh end surface;
The seventh end surface and the eighth end surface are constituted by a fourth connecting portion that connects end portions on the distal end side of the second projecting portion,
The fourth connecting portion has a fourth inclined portion,
The fourth inclined portion forms an acute angle with the eighth end surface;
In the stacking direction, the first protrusion, the fourth protrusion, and the second protrusion are sequentially disposed from the first end face side.
In the stacking direction, the third protrusion, the second protrusion, and the fourth protrusion are sequentially arranged from the second end face side,
Between the first protrusion and the fourth protrusion, between the second protrusion and the fourth protrusion, and between the second protrusion and the third protrusion, The uncoated parts constituting the electrical parts are each divided and arranged in a plurality of bundles,
The width of the second inclined portion and the fourth inclined portion in the stacking direction of the second protruding portion and the fourth protruding portion, respectively, is the stack of the second protruding portion and the fourth protruding portion, respectively. A power storage device, wherein the power storage device is formed to exceed half of a width in a direction.   The first inclined portion, the second inclined portion, the third inclined portion, and the fourth inclined portion are respectively the first protruding portion, the second protruding portion, the third protruding portion, and the fourth protruding portion. The power storage device according to claim 1, wherein the power storage device is formed at a tip of the portion. The distal end of the third projecting portion and the distal end of the fourth projecting portion are separated from the first proximal end portion that is the proximal end portion of the first projecting portion and the second projecting portion of the first member. And
The distal end of the first projecting portion and the distal end of the second projecting portion are separated from the second proximal end portion that is the proximal end portion of the third projecting portion and the fourth projecting portion of the second member. The power storage device according to claim 1, wherein the power storage device is provided.   In a direction orthogonal to the stacking direction, a first edge disposed on the first base end side of the uncoated part forming the current collector is on the second base end side. The second edge portion, which is inclined and arranged on the second base end side among the edges of the uncoated portion, is inclined toward the first base end side. The power storage device according to claim 3.   The said 1st projection part and the said 3rd projection part, and the said 2nd projection part and the said 4th projection part have each comprised the same shape, The any one of Claims 1-4 characterized by the above-mentioned. The power storage device described.   The second projecting portion and the fourth projecting portion have a tapered shape in which the cross-sectional area along the stacking direction on the distal end side is smaller than the cross-sectional area along the stacking direction on the base end side. The power storage device according to claim 1, wherein the power storage device is provided.   The power storage device according to claim 1, wherein the first member and the second member are made of the same metal as the thin metal plate. An electrode body having a layered structure in which a plurality of electrode sheets each having a metal thin plate, a coated portion where an active material is applied to the surface of the metal thin plate, and an uncoated portion where the active material is not applied;
A current collector formed extending from one edge of the electrode body, and a plurality of uncoated portions of the electrode sheets are stacked to form a layered structure;
An electrode terminal for extracting power from the electrode body;
A power storage device having a current collecting member that electrically connects the current collecting part and the electrode terminal,
End faces extending along the laminating direction are formed at both ends of the electrode body in the laminating direction, respectively.
The current collecting member has a first member and a second member arranged on one end face of the both end portions and arranged in a direction orthogonal to the stacking direction of the electrode body,
In the first member, a first side surface that is a side surface parallel to the layer in the electrode body and a second side surface that is a side surface opposite to the first side surface are formed, respectively.
The first member is electrically connected to the electrode terminal;
The first member is formed with a first protrusion protruding toward the second member and at least one second protrusion,
The first protrusion is at least
A first end surface continuous with the first side surface and parallel to the first side surface;
A second end surface which is an end surface opposite to the first end surface;
The first end surface and the second end surface are configured by a first connecting portion that connects end portions on the distal end side of the first projecting portion,
The first connecting portion has a first inclined portion;
The first inclined portion forms an acute angle with the first end surface;
The second protrusion is at least
A third end face formed on the first end face side and parallel to the first end face;
A fourth end surface that is an end surface opposite to the third end surface;
The third end surface and the fourth end surface are configured by a second connecting portion that connects end portions on the distal end side of the second projecting portion,
The second connecting part has a second inclined part,
The second inclined portion forms an acute angle with the fourth end surface;
The second member has a third side surface that is a side surface parallel to the layer in the electrode body, and a fourth side surface that is a side surface opposite to the third side surface, respectively.
The third side surface is formed on the same side as the first side surface, and the fourth side surface is formed on the same side as the second side surface,
The second member is continuous with the first member directly or through the uncoated portion forming the current collector,
The second member is formed with a third protrusion that protrudes toward the first member, and at least one fourth protrusion.
The third protrusion is at least
A fifth end surface that is continuous with the fourth side surface and parallel to the fourth side surface;
A sixth end surface which is an end surface opposite to the fifth end surface;
The fifth end surface and the sixth end surface are configured by a third connecting portion that connects end portions on the distal end side of the third projecting portion,
The third connecting portion has a third inclined portion;
The third inclined portion forms an acute angle with the fifth end surface;
The fourth protrusion is at least
A seventh end surface formed on the fifth end surface side and parallel to the fifth end surface;
An eighth end surface which is an end surface opposite to the seventh end surface;
The seventh end surface and the eighth end surface are constituted by a fourth connecting portion that connects end portions on the distal end side of the second projecting portion,
The fourth connecting portion has a fourth inclined portion,
The fourth inclined portion forms an acute angle with the eighth end surface;
In the stacking direction, the first protrusion, the fourth protrusion, and the second protrusion are sequentially disposed from the first end face side.
In the stacking direction, the third protrusion, the second protrusion, and the fourth protrusion are sequentially arranged from the second end face side,
Between the first protrusion and the fourth protrusion, between the second protrusion and the fourth protrusion, and between the second protrusion and the third protrusion, The uncoated parts constituting the electrical parts are each divided and arranged in a plurality of bundles,
Arranged on the first base end side, which is the base end of the first protrusion and the second protrusion, of the edge of the uncoated part forming the current collector in the direction perpendicular to the stacking direction The first edge portion is inclined toward the second base end portion side which is the base end portion of the third protrusion portion and the fourth protrusion portion, and among the edge portions of the uncoated portion, The power storage device, wherein a second edge portion arranged on the second base end side is inclined toward the first base end side. The second protrusion is formed with a first lower surface that connects the third end surface and the fourth end surface and is formed on the electrode body side, and a first upper surface opposite to the first lower surface,
A fifth inclined surface that continues the first lower surface and the first upper surface is formed at the tip of the second protrusion,
The fifth inclined surface has an acute angle with the first lower surface or the first upper surface,
The fourth protrusion is formed with a second lower surface that connects the seventh end surface and the eighth end surface and is formed on the electrode body side, and a second upper surface opposite to the second lower surface,
A sixth inclined surface that is continuous with the second lower surface and the second upper surface is formed at the tip of the fourth protrusion,
The power storage device according to claim 8, wherein an angle formed between the sixth inclined surface and the second lower surface or the second upper surface is an acute angle.   The power storage device according to claim 1, wherein the power storage device is a secondary battery.   A vehicle comprising the power storage device according to any one of claims 1 to 10.