JP5699955B2 - Power storage device and vehicle - Google Patents

Description

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

  As is well known, rechargeable secondary batteries can be used repeatedly, and are therefore widely used in various devices and apparatuses. In the field of vehicles, the use of fossil fuels (reduction of carbon dioxide emissions) is required, so vehicles that use this type of secondary battery as a motor power source, so-called hybrid vehicles and EV vehicles (Electric Vehicle vehicles) ) And so on. In such a secondary battery, charging and discharging with a large current and an increase in battery capacity are required. For example, lithium ion secondary batteries are mass-produced as products.

  As shown in FIG. 10, in this type of secondary battery 81, a sheet-like positive electrode 82 and a negative electrode 83 are stacked and formed in a plurality of layers, and a separator 84 is interposed between the positive electrode 82 and the negative electrode 83. . Each of the positive and negative electrodes is an electrode layer in which an active material layer 86 is applied (sandwiched) on both sides of a metal foil 85. In each of the positive and negative electrodes, a portion of the edge of the foil 85, that is, an uncoated portion 87 is drawn out at the same polarity, and a terminal member 89 such as an electrode terminal or a lead is provided on a current collecting portion 88 formed by collecting them. It is attached by welding or the like (see Patent Document 1).

JP 2009-087728 A

  However, as shown in FIG. 10, the current collector 88 is formed by bundling uncoated portions 87 having the same length, so that the end face misalignment portion 90 where the uncoated portions 87 do not have the same length in practice. Occurs. Since this end face misalignment 90 is an unnecessary part that cannot be used for welding, when the terminal member 89 is fixed to the current collector 88 by welding, the root part thereof becomes the welded part 91, and the end face misalignment 90 is generated as a dead space 92. Leads to problems. Since such a dead space 92 becomes a useless space that does not function as an electrode, there is a concern that the energy density of the secondary battery 81 will be adversely affected, and that downsizing of the device may be hindered.

  Incidentally, as shown in FIG. 11, Patent Document 1 can be regarded as a structure in which the end portion of the current collector 88, that is, a group of uncoated portions 87 is formed in a straight line to eliminate the dead space 92. However, in order to accommodate the end portion of the uncoated portion 87 as the straight portion 93, it is necessary to cut the end portion of the uncoated portion 87 in order to align the end portions of the uncoated portion 87. Therefore, in Patent Document 1, there is a concern that the manufacturing work is increased by one step, and the manufacturing cost is increased. Therefore, there has been a need for technical development that can eliminate the dead space 92 caused by the end face misalignment portion 90 without cutting the end of the uncoated portion 87.

  The objective of this invention is providing the electrical storage apparatus and vehicle which can eliminate the dead space of the direction which cross | intersects the lamination direction of an electrode body, without cutting the edge of an uncoated part.

In order to solve the above problems, in claim 1, the active material is formed on an active material, a coating portion in which the active material is coated on a base material, and an end portion of the base material. A power storage device comprising a positive and negative electrode having an uncoated portion and a separator that insulates between the positive and negative electrodes, and an electrode body in which the coated portion and the separator are laminated in layers. And a current collecting group in which the uncoated portions are bundled, and a terminal member joined to an outer surface of the current collecting group, and the current collecting group has a tip in the stacking direction of the electrode body. The current collector group has an extending portion that extends perpendicularly to the stacking direction of the electrode body on the electrode body side from the bending portion, and the extending portion, the outer surface of said terminal member to be joined are arranged aligned in the stacking direction of the surface of the electrode body, wherein the terminal member has It is curved in a shape along the curved portion, in the stacking direction of the electrode body is provided to protrude from the tip of the current collector group, wherein the terminal member is accommodated in the stack thickness range in the stacking direction of the electrode body It is the gist.

  According to the configuration of the present invention, it is possible to store an end face shift portion that is formed at the tip portion of the current collecting group when the uncoated portions are bundled inside the terminal member. For this reason, it becomes possible to eliminate the dead space resulting from the end face misalignment without cutting the end face misalignment. Therefore, it is possible to eliminate the dead space in the direction intersecting with the stacking direction of the electrode bodies without using a costly method of cutting the end face misalignment.

Further , since the bent terminal member does not have to jump out in the stacking direction of the electrode bodies, no dead space occurs in the stacking direction of the electrode bodies.
Further, since the terminal member does not have to jump out in the stacking direction of the electrode bodies, no dead space is generated in the stacking direction of the electrode bodies.
In Claim 2, the active material, the coating part by which the said active material was coated to the base material, and the uncoated part which is formed in the edge part of the said base material and the said active material is not coated A power storage device comprising an electrode body having a positive and negative electrode and a separator that insulates between the positive and negative electrodes, and wherein the coating part and the separator are laminated in layers, the uncoated part And a terminal member joined to the outer surface of the current collection group, and the current collection group has a curved portion whose tip is curved toward the stacking direction of the electrode bodies. The current collection group is disposed near an end serving as an outer surface of the electrode body in the stacking direction of the electrode body, and the terminal member is bent into a shape along the bending portion, Projecting from the tip of the current collection group in the stacking direction of It is summarized as that in the stacking direction of the body are contained within a laminated layer thickness range.
According to this configuration, since the terminal member can be formed large in the stacking direction of the electrode body, the electrode body in which the area of the terminal contact area is related to the magnitude of the current contributes to charge / discharge of a large current. To do.
In Claim 3, the active material, the coating part by which the said active material was coated to the base material, and the uncoated part which is formed in the edge part of the said base material and the said active material is not coated A power storage device including a positive and negative electrode and a separator that insulates between the positive and negative electrodes, and an electrode body in which the coating part and the separator are laminated in layers, the uncoated part And a terminal member joined to the outer surface of the current collection group, and the current collection group has a curved portion whose tip is curved toward the stacking direction of the electrode bodies. The terminal member is bent into a shape along the bending portion, the current collecting group is housed on the inner peripheral surface side of the portion where the terminal member is bent, and the current collecting group is arranged in the stacking direction of the electrode body. The terminal member protrudes from the tip, and the terminal member is within a stacking thickness range in the stacking direction of the electrode body. And summarized in that, which is on.

According to claim 4, in the invention of claim 1 or 3, wherein the collector unit shall be the subject matter to be disposed on the surface side of the stacking direction of the electrode body in the laminating direction of the electrode body.

According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the current collection group is an extension extending perpendicularly to the stacking direction of the electrode bodies on the electrode body side from the curved portion. has a portion, the outer surface of said terminal member to be joined to the extended portion shall be the subject matter being disposed aligned in the stacking direction of the surface of the electrode body.

As a definition, the “direction perpendicular to the stacking direction of the electrode bodies” is not limited to being perpendicular to the stacking direction, and includes a case where it is slightly deviated.
A sixth aspect of the present invention is a vehicle including the power storage device according to any one of the first to fifth aspects.

  ADVANTAGE OF THE INVENTION According to this invention, the dead space of the direction which cross | intersects the lamination direction of an electrode body can be eliminated, without cutting the edge of an uncoated part.

The disassembled perspective view of the secondary battery of one Embodiment. The perspective view which shows the external appearance of a secondary battery. The disassembled perspective view which shows the component of an electrode body. Explanatory drawing which shows a mode that the uncoated part of foil is bundled on one side. The perspective view which shows the state which aligned the plate-shaped lead | read with the current collection part. Explanatory drawing which shows a mode that a lead is welded to a current collection part. Explanatory drawing which shows the state which bent the lead after welding. The perspective view which shows the state which bent the lead after welding. The perspective view which shows the external appearance of the electrode body of another example. Sectional drawing showing the end surface gap part which arises in the conventional current collection part. Sectional drawing which similarly shows the structure of the conventional electrode body.

Hereinafter, an embodiment of a power storage device and a vehicle embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, for example, a vehicle 1 such as a hybrid vehicle or an EV vehicle (shown in FIG. 2) has a secondary battery 2 mounted as a power source of a motor used as a drive source of the vehicle 1. Yes. For example, a metal case 3 is provided in the secondary battery 2, and an electrode body 5, which is a power generation element, is accommodated inside the case body 4. The upper opening 4 a of the case body 4 is closed by a metal plate-like case lid 6.

  On the upper surface of the secondary battery 2, a positive electrode terminal 7 that is a positive electrode terminal and a negative electrode terminal 8 that is a negative electrode terminal are provided. The positive electrode terminal 7 and the negative electrode terminal 8 are exposed to the outside of the case 3 through the opening 6 a (shown in FIG. 1) of the case lid 6. Ring-shaped insulating members 9 that insulate the positive terminal 7 and the negative terminal 8 from the case 3 are attached between the positive terminal 7 and the negative terminal 8 and the case lid 6.

  As shown in FIGS. 1 and 3, the electrode body 5 includes a thin positive electrode sheet 10 serving as a positive electrode, a thin negative electrode sheet 11 serving as a negative electrode, and a separator 12 interposed between the positive electrode sheet 10 and the negative electrode sheet 11. And an assembly having a plurality of layers (layers). Thus, the electrode body 5 of the present embodiment has a laminated structure in which the sheet group of the positive electrode sheet 10, the negative electrode sheet 11, and the separator 12 is laminated in a certain direction (stacking direction: Y-axis direction in FIG. 1 and the like). Take. In addition, it is also possible to put electrolyte solution between each layer. The positive electrode sheet 10 and the negative electrode sheet 11 are actually made of very thin film members. Then, several tens of these are laminated, and the interval between the adjacent separators 12 is set to about 100 to 160 μm. The positive electrode sheet 10 corresponds to the positive electrode, and the negative electrode sheet 11 corresponds to the negative electrode.

  As shown in FIG. 3, a positive electrode active material layer 14 is applied to both surfaces of a metal sheet-like foil 13 on both surfaces of the positive electrode sheet 10, and this portion is formed as a coating portion 15. A part of the foil 13 is drawn out as a tab on a part of the periphery of the positive electrode sheet 10, and this part is formed as an uncoated part 16 where the positive electrode active material layer 14 is not applied. On both surfaces of the negative electrode sheet 11, a negative electrode active material layer 18 is applied on both surfaces of a metal sheet-like foil 17, and a coated portion 19 and an uncoated portion 20 are formed in the same manner as the positive electrode sheet 10. The foils 13 and 17 correspond to the base material.

  As shown in FIG. 1, each of the positive electrode sheet 10 and the negative electrode sheet 11 is gathered by bundling uncoated portions 16 and 20 having the same polarity in the stacking direction Y (see FIGS. 4 and 5). Electric parts 21 and 22 are formed. In this example, the positive electrode side is the positive electrode current collector 21, and the negative electrode side is the negative electrode current collector 22. The current collectors 21 and 22 are arranged at positions close to the ends on the same surface (the upper surface in this example) of the electrode body 5. Therefore, the electrode body 5 of this example has a shape in which a pair of the positive electrode current collector part 21 and the negative electrode current collector part 22 protrude in a tab shape from one side (upper side) of the electrode pair 23 which is the main body part of the electrode body 5. ing. The current collecting units 21 and 22 constitute a current collecting group.

  As shown in FIG. 6, an end face misalignment portion (the positive electrode side is Ka) in which the protruding length of the foil 13 is sequentially reduced occurs in the uncoated portion 16 of the positive electrode current collector portion 21. This is because the length of each foil 13 of the uncoated portion 16 is originally the same, but the tip position is different due to the difference in the arrangement path caused by bundling. Since the uncoated portion 16 does not line up with the same length, the end face shift portion Ka becomes a portion where resistance welding cannot be performed. Further, the end face deviation portion Ka also becomes a dead space (the positive electrode side is S1) in the height direction of the electrode body 5 (Z-axis direction in FIG. 1 and the like). Although not shown, the negative electrode current collector 22 also has an end face misalignment Kb at the tip of the uncoated part 20 as well as the positive electrode current collector 21, and this occurs as a dead space S2.

  As shown in FIG. 1, metal leads 24 and 25 having L-shaped cross sections are attached and fixed to the current collectors 21 and 22. In this example, the positive electrode side is the positive electrode lead 24 and the negative electrode side is the negative electrode lead 25. The leads 24 and 25 of this example can be bent to eliminate the dead spaces S1 and S2, and the current collectors 21 and 22 are housed in a state of being bent inside by this bending process. The positive electrode lead 24 and the negative electrode lead 25 correspond to terminal members.

  The positive electrode lead 24 has a root portion 26 extending in the height direction (Z-axis direction) of the electrode body 5, a bent portion 27 that bends at a right angle of about 90 degrees from the root portion 26, and an electrode terminal attachment that serves as an electrode terminal attachment location. And a portion 27a. These are integrally formed in the positive electrode lead 24. The positive electrode terminal 7 is fixed to the back surface of the electrode terminal mounting portion 27a by, for example, welding. The set of the positive electrode current collector 21 and the positive electrode lead 24 and the set of the negative electrode current collector 22 and the negative electrode lead 25 are arranged symmetrically in the length direction of the electrode body 5 (X-axis direction in FIG. 1 and the like).

  As shown in FIG. 7, the positive electrode current collector 21 has a base extending portion 21 a fixed to the inner surface of the base portion 26 of the positive electrode lead 24 by welding. The extending portion 21a is erected on the electrode body 5 side with respect to the bending portion 21b in a direction perpendicular to the stacking direction of the electrode bodies 5. The positive electrode current collector 21 is formed as a curved portion 21 b whose tip is curved toward the stacking direction of the electrode body 5. The curved portion 21b of the positive electrode current collector 21 is not fixed to the positive electrode lead 24. When the base of the positive electrode lead 24 is one end and the tip is the other end, the positive electrode current collector 21 has one end to the other end as a radius. It will be located within.

  The positive electrode lead 24 is bent in a shape along the curved portion 21 b of the positive electrode current collector 21. The positive electrode lead 24 is formed to protrude outward from the tip of the positive electrode current collector 21 in the stacking direction of the electrode body 5.

  As shown in FIG. 1, the negative electrode lead 25 has a root portion 29, a bent portion 30, and an electrode terminal attachment portion 30 a, similarly to the positive electrode lead 24. Similarly to the positive electrode current collector 21, the negative electrode current collector 22 has a base extended portion 22 a fixed to the inner surface of the negative electrode lead 25 by welding, and a distal end curved portion 22 b along the stacking direction of the electrode body 5. Is formed. Since the negative electrode current collector 22 and the negative electrode lead 25 have the same shape as the positive electrode current collector 21 and the positive electrode lead 24, detailed description thereof is omitted.

  The positive electrode lead 24 is a flat L-shaped plate material as shown in FIG. 5 and the bent portion 27 on the open side is connected to the joint 32 without bending the root portion 26 as shown in FIG. 7 and FIG. By bending along, it is formed in an L-shaped cross section. Similarly to the positive electrode lead 24, the negative electrode lead 25 is also formed by bending a plane L-shaped plate material along the joint 33 (see FIG. 1). As illustrated in FIG. 1, welding spots 34 a and 34 b for resistance welding may be formed at the base portions 26 and 29 of the positive electrode lead 24 and the negative electrode lead 25.

  As shown in FIG. 6, in the positive electrode lead 24, the outer surface 26 a of the root portion 26 is disposed on the same surface as the side surface 23 a of the electrode pair 23. As shown in FIG. 7, the positive electrode lead 24 is formed with a length that allows the bent portion 27 to be within the thickness range W in the stacking direction Y, that is, within the stack thickness range after being bent. Although not shown, the negative electrode lead 25 is also formed in the same shape and size as the positive electrode lead 24.

  Next, the manufacturing process of the electrode body 5 of this example is demonstrated using FIGS. Here, the manufacturing process for attaching the positive electrode lead 24 to the positive electrode current collector 21 will be described. However, since the method for attaching the negative electrode lead 25 is basically the same as the positive electrode lead 24, only the attachment process of the positive electrode lead 24 will be described in detail. .

  First, as shown in FIG. 4, in the laminated positive electrode sheet 10, the uncoated portions 16 are collected on the surface on one end side in the laminating direction Y (the lower end in FIG. 4) and stacked. At this time, since the uncoated portions 16 having the same length are originally gathered on one side, the uncoated portions 16 have end face shift portions Ka in which the lengths of the uncoated portions 16 are sequentially reduced. . Since the lengths of the uncoated parts 16 are different from each other, the end face deviation part Ka becomes an unnecessary part of resistance welding performed thereafter.

  Subsequently, as shown in FIG. 5, the plate-shaped positive electrode lead 24 that is not bent is aligned with the positive electrode current collector 21, and the base portion 26 of the positive electrode lead 24 is brought into contact with the positive electrode current collector 21. . At this time, the positive electrode lead 24 is positioned so that itself (the outer surface 26a of the root portion 26) is flush with the side surface 23a of the electrode pair 23 in the plane direction (XZ plane in FIG. 5).

  Then, as shown in FIG. 6, the positive electrode lead 24 is attached to the positive electrode current collector 21 by resistance welding. Resistance welding is a welding method in which the positive electrode current collector 21 and the positive electrode lead 24 are sandwiched and welded between a pair of positive and negative resistance welding electrodes 36 and 37. In the case of this example, resistance welding is performed on the welding spot 34 a of the positive electrode lead 24. Since the welding spot 34a is below the bent portion 27, it can be said that the resistance welding is performed below the bent portion 27, that is, below the bent portion. Further, in resistance welding, a portion where all the uncoated portions 16 of the positive electrode are stacked is welded. In the group of uncoated portions 16, the resistance welded portion becomes the welded portion 38 and is firmly fixed to the positive electrode lead 24. The welded portion 38 corresponds to a joint portion.

  Subsequently, as shown in FIGS. 7 and 8, the positive lead 24 is bent at approximately 90 degrees at the joint 32 to form an L-shaped cross section, thereby eliminating the dead space S1 in the height direction Z of the electrode body 5. To do. At this time, the positive electrode lead 24 is bent on the welded portion 38, that is, the bent portion 27, and the end face deviation portion Ka is guided to the inner surface of the L-shaped bent portion 27 of the positive electrode lead 24, thereby Turn along the same way. Further, the end of the end face shift portion Ka is the welded portion 38, and the tip end side is open. For this reason, when the positive electrode lead 24 is bent, the end face deviation portion Ka where the end portion is open is not subjected to bending stress and is simply bent as it is.

  Further, as shown in FIG. 7, when the positive electrode lead 24 is bent about 90 degrees, the base portion 26 of the positive electrode lead 24 and the uncoated portion 16 of the positive electrode current collector 21 are stacked in the electrode body 5. The state is within the thickness range W in the direction Y. Therefore, even if the positive electrode lead 24 is bent about 90 degrees, the positive electrode lead 24 does not jump out to the side in the stacking direction Y of the electrode body 5.

  When the attachment of the positive electrode lead 24 is completed, the attachment of the negative electrode lead 25 is performed in the same process as the positive electrode lead 24 this time. When the negative electrode lead 25 is attached to the negative electrode current collector 22, the positive electrode terminal 7 is fixed to the positive electrode lead 24, and the negative electrode terminal 8 is fixed to the negative electrode lead 25, thereby assembling the electrode body 5. Then, the assembly of the secondary battery 2 is completed by housing the electrode body 5 in the case body 4 and closing the opening 4 a of the case body 4 with the case lid 6.

  As described above, in this example, the plate-like leads 24 and 25 are welded to the current collectors 21 and 22, and the leads 24 and 25 are bent into an L-shaped cross section so that the leads 24 and 25 are Attach to 22. As a result, the end face deviation portions Ka and Kb are bent along the L-shape of the leads 24 and 25, and the end face deviation portions Ka and Kb are housed inside the leads 24 and 25. Therefore, it is possible to eliminate the dead spaces S1 and S2 in the height direction Z of the electrode body 5 without using a costly method of cutting the end face shift portions Ka and Kb in a straight line.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) When the leads 24 and 25 are attached and fixed to the current collectors 21 and 22, the open ends of the current collectors 21 and 22, that is, the end face shift portions Ka and Kb are aligned with the L-shape of the bent portions 27 and 30. Therefore, the end face shift portions Ka and Kb can be accommodated inside the leads 24 and 25. Therefore, the dead spaces S1 and S2 can be eliminated without using a costly method of cutting the end face shift portions Ka and Kb in a straight line.

  (2) The leads 24 and 25 bent in an L-shaped cross section are disposed within a thickness range W in the stacking direction Y of the electrode body 5. This eliminates the need for the bent leads 24 and 25 to jump out of the stacking direction Y, so that no dead space occurs in the stacking direction Y.

  (3) When the uncoated portions 16 and 20 are bundled, they are gathered and arranged at a position near the end in the stacking direction Y. For this reason, since the width of the leads 24 and 25 in the stacking direction Y can be increased, the electrode body 5 in which the area of the terminal contact portion is proportional to the magnitude of the current contributes to charge / discharge of a large current.

  (4) After preparing the plate-like leads 24 and 25 and welding the leads 24 and 25 to the current collectors 21 and 22, the leads 24 and 25 are bent into an L shape to collect the leads 24 and 25. Attach to parts 21 and 22. Therefore, the leads 24 and 25 can be attached to the current collectors 21 and 22 by a simple manufacturing process of welding and bending the plate-like leads 24 and 25 to the current collectors 21 and 22.

  (5) The leads 24 and 25 are positioned on the same surface as the side surface 23 a of the electrode pair 23. For this reason, it is not necessary for the leads 24 and 25 to jump out of the side surface 23 a of the electrode pair 23, so that no dead space occurs in the stacking direction Y of the electrode body 5.

  (6) When the leads 24 and 25 are bent into an L-shaped cross section, the positioning of the leads 24 and 25 is completed. Therefore, the leads 24 and 25 can be attached to the current collectors 21 and 22 by a simple operation of simply bending the leads 24 and 25 by about 90 degrees.

The embodiment is not limited to the configuration described so far, and may be modified as follows.
As shown in FIG. 9, the set of the positive electrode current collector 21 and the positive electrode lead 24 and the set of the negative electrode current collector 22 and the negative electrode lead 25 may be arranged rotationally symmetrically.

The leads 24 and 25 are not limited to bend after being welded to the current collectors 21 and 22, and may be bent from the beginning.
-The positive electrode current collection part 21 is not limited to one, For example, multiple may be sufficient and these may be electrically connected by one or a some lead | read | reed. The same can be said for the negative electrode current collector 22.

The electrode terminals (the positive terminal 7 and the negative terminal 8) are not limited to being attached to the lower surfaces of the leads 24 and 25, and may be attached to the upper surface, for example.
The positive electrode terminal 7 and the negative electrode terminal 8 are not limited to being arranged on the same side of the electrode pair 23, and may be arranged on different sides.

-A welding location may be any location as long as the uncoated portions 16 and 20 are bundled.
-Various types of welding such as spot welding, butt welding, and projection welding can be used for resistance welding. Further, the welding is not limited to resistance welding, and other methods can be adopted.

The joining of the leads 24 and 25 and the current collectors 21 and 22 is not limited to welding, and other methods such as adhesion and welding can be adopted.
The leads 24 and 25 are not limited to the shapes described in the embodiment, and can be changed to various shapes.

The current collectors 21 and 22 are not limited to being gathered at positions close to the end in the stacking direction Y, and may be arranged at the center position in the stacking direction Y, for example.
The bending shape of the leads 24 and 25 is not limited to the L-shaped cross section, and can be changed to other shapes such as a T-shape.

The arrangement position of the current collectors 21 and 22 is not limited to the upper surface of the electrode pair 23 but can be changed to a side surface or a lower surface.
-A positive electrode and a negative electrode are not limited to a sheet-like member, For example, you may use the plate-shaped member with predetermined amount thickness.

-The raw material of the positive electrode sheet 10, the negative electrode sheet 11, and the separator 12 can be changed suitably.
The terminal member is not limited to the leads 24 and 25, and may be an electrode terminal itself.

-The electrode body 5 is not limited to a laminated structure, It is good also as a winding structure which winds a sheet-like electrode pair in many layers, and has a positive / negative electrode layer.
The power storage device is not limited to a secondary battery, and may be an electric double layer capacitor using a nonaqueous electrolyte capacitor (nonaqueous electrolyte capacitor), for example.

  The electrode body 5 is not limited to being mounted on the vehicle 1 and can be mounted on other devices and apparatuses.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Secondary battery (battery), 5 ... Electrode body, 10 ... Positive electrode sheet as a positive electrode, 11 ... Negative electrode sheet as a negative electrode, 12 ... Separator, 13, 17 ... Foil as a base material, 14 ... Positive electrode active material layer, 15, 19 ... coated portion, 16, 20 ... uncoated portion, 18 ... negative electrode active material layer, 21 ... positive electrode current collecting portion constituting current collecting group, 21a ... extended portion, 21b ... Curved portion, 22 ... negative electrode current collector constituting current collecting group, 22a ... extended portion, 22b ... curved portion, 23 ... electrode pair, 23a ... side, 24 ... positive electrode lead constituting terminal member, 25 ... terminal member Negative electrode lead, 26, 29 ... root portion, 26a, 29a ... outer surface, 27, 30 ... bent portion, 38 ... welded portion as joint portion, 51 ... power storage device, 52, 53 ... positive and negative electrodes, 54 ... Separator, 55 ... Electrolytic solution, W ... Thickness range in the lamination direction, Y ... Lamination Direction, the height direction as a direction crossing the Z ... stacking direction.

Claims (6)

A positive and negative electrode having an active material, a coated portion where the active material is coated on a base material, and an uncoated portion which is formed at an end portion of the base material and where the active material is not coated; ,
A separator that insulates between the positive and negative electrodes,
A power storage device comprising an electrode body in which the coating part and the separator are laminated in layers,
A current collecting group in which the uncoated portions are bundled;
A terminal member joined to the outer surface of the current collection group,
The current collection group has a curved portion whose tip is curved toward the stacking direction of the electrode body,
The current collection group has an extending portion that extends perpendicularly to the stacking direction of the electrode body on the electrode body side from the curved portion, and an outer surface of the terminal member that is joined to the extending portion is: Arranged on the surface of the electrode body in the stacking direction, the terminal member is curved in a shape along the curved portion, and is provided so as to protrude from the tip of the current collecting group in the stacking direction of the electrode body. The power storage device is characterized in that the terminal member is housed in a stacking thickness range in the stacking direction of the electrode bodies . A positive and negative electrode having an active material, a coated portion where the active material is coated on a base material, and an uncoated portion which is formed at an end portion of the base material and where the active material is not coated; ,
A separator that insulates between the positive and negative electrodes,
A power storage device comprising an electrode body in which the coating part and the separator are laminated in layers,
A current collecting group in which the uncoated portions are bundled;
A terminal member joined to the outer surface of the current collection group,
The current collection group has a curved portion whose tip is curved toward the stacking direction of the electrode body,
The current collecting group is disposed near an end serving as an outer surface of the electrode body in the stacking direction of the electrode body, and the terminal member is bent into a shape along the curved portion, and the electrode body is stacked. The power storage device is provided so as to protrude from the tip of the current collecting group in a direction, and the terminal member is accommodated in a stacking thickness range in the stacking direction of the electrode bodies . A positive and negative electrode having an active material, a coated portion where the active material is coated on a base material, and an uncoated portion which is formed at an end portion of the base material and where the active material is not coated; ,
A separator that insulates between the positive and negative electrodes,
A power storage device comprising an electrode body in which the coating part and the separator are laminated in layers,
A current collecting group in which the uncoated portions are bundled;
A terminal member joined to the outer surface of the current collection group,
The current collection group has a curved portion whose tip is curved toward the stacking direction of the electrode body,
The terminal member is bent into a shape along the bending portion, the current collecting group is accommodated on the inner peripheral surface side of the portion where the terminal member is bent, and the tip of the current collecting group in the stacking direction of the electrode body The power storage device is provided so as to protrude further, and the terminal member is housed in a stacking thickness range in the stacking direction of the electrode bodies . The collector group, the electric storage device according to claim 1 or 3, characterized in that disposed on the surface side of the stacking direction of the electrode body in the laminating direction of the electrode body. The current collection group has an extending portion that extends perpendicularly to the stacking direction of the electrode body on the electrode body side from the curved portion, and an outer surface of the terminal member that is joined to the extending portion is: power storage device according to any one of claims 2-4, characterized in that it is arranged aligned in the stacking direction of the surface of the electrode body. A vehicle comprising the power storage device according to any one of claims 1 to 5 .