JP5978607B2 - Power storage device and method for manufacturing power storage device - Google Patents

Description

  The present invention relates to a power storage element in which power storage / discharge means such as a power generation element and an electrolytic solution are housed in a housing, and more particularly to a power storage element in which the power generation element and a current collector are connected at a plurality of locations.

  In recent years, a traveling vehicle using electric power as a driving source or a part of the driving source, such as a hybrid vehicle, an electric vehicle, and an assist bicycle, has attracted attention. As a power source of such a traveling vehicle, a storage element having a high energy capacity (for example, Secondary battery) has been put into practical use. In addition, power storage elements that store electric power generated by solar power generation and the like have been put into practical use. For example, a lithium ion battery or the like can be listed as the high energy capacity storage element.

  As an internal structure of such a power storage element, for example, as described in Patent Document 1, electrode terminals for supplying and storing power to a rigid housing made of metal or the like are attached in an insulated state. A current collector connected to the electrode terminal and arranged along the inner wall so as not to contact the inner wall of the housing, and a structure in which the power generation element is arranged in a bridged state between the two current collectors It has been adopted.

  The current collector includes two strip-shaped connection portions in a hanging shape, and the power generation element includes two connection portions arranged to extend in the vertical direction, and the two connection portions of the current collector are outside. In addition, after arranging the two connecting portions of the power generating element to be inside, the connecting portion of the current collector and the connecting portion of the power generating element are connected by ultrasonic welding.

  In this case, since the connection portion on the power generation element side is a thin metal foil, if a chip that vibrates ultrasonically is disposed on the power generation element side, the thin metal foil portion of the current collector may be damaged. Therefore, since it is necessary to bring the chip into contact with the connection portion of the current collector, conventionally, after connecting one of the two connection points, the power generating element is mechanically turned over to turn the other connection point. It is necessary to perform welding.

  In addition, when the connecting portion of the current collector and the connecting portion of the power generation element are connected by laser welding or spot welding, the power generation element may be turned over.

JP 2011-165437 A

  However, mechanically reversing the power generating element welded to the current collector uses a complicated mechanism and further requires a long time, so that it is not possible to improve the production efficiency of this type of power storage element. It was very difficult.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to provide a power storage element and a method for manufacturing the power storage element that can simplify and shorten the connection process between the current collector and the power generation element. Yes.

  In order to achieve the above object, a power storage device according to the present invention includes a film-like first polar body that is one of a negative electrode and a positive electrode, and a film-like second polar body that is the other and a film-like one. A power storage element comprising a power generation element in which separators are arranged in layers in a first direction and a first current collector electrically connected to the first electrode body, wherein the first current collector is And a first connection part and a second connection part that extend in a direction crossing the first direction and are arranged side by side in the first direction, and the first polar body includes the first connection part and the first connection part. A third connecting part arranged between the second connecting part and connected to the first connecting part; and arranged outside the first connecting part and the second connecting part and connected to the second connecting part. And a fourth connecting portion.

  According to this, after connecting a 1st connection part and a 3rd connection part by welding, a 2nd connection part and a 3rd connection part can be connected, without inverting an electric power generation element.

  Therefore, after connecting the first connection part and the third connection part, it is only necessary to relatively move the power generation element and the connection machine by the distance between the first connection part and the second connection part, without rotation. You can complete the following settings: Accordingly, the connection process can be simplified and shortened, and the production efficiency of the storage element can be improved.

  In addition, the term “storage element” described in the specification and claims is an element capable of electrochemically storing electricity and discharging electricity as required. Specifically, it is described as including a storage battery, a capacitor, a large capacity capacitor, a capacitor, an electrolytic capacitor, an electric double layer capacitor, and the like.

  The first current collector includes a base portion in which the second connection portion is provided in a protruding state, and a position of a surface of the second connection portion along the first direction in a connection portion between the base portion and the second connection portion. To a position where the fourth connecting portion can come into contact with the fourth connecting portion.

  According to this, even if it is a case where the third connection part and the fourth connection part are connected as in the case of, for example, a winding type power generation element, the twisted part is used to straddle the connected part. Thus, the second connection portion can be disposed between the third connection portion and the fourth connection portion.

  And a second current collector electrically connected to the second pole body, the second current collector extending in a direction intersecting the first direction and arranged side by side in the first direction. A fifth connecting portion and a sixth connecting portion, wherein the second polar body is disposed between the fifth connecting portion and the sixth connecting portion and is connected to the fifth connecting portion. A connecting portion; and an eighth connecting portion disposed outside the fifth connecting portion and the sixth connecting portion and connected to the sixth connecting portion, wherein the first connecting portion and the fifth connecting portion are It may be arranged on the same side in the first direction.

  According to this, even if it is a case where a 1st electrical power collector and a 2nd electrical power collector are connected to each of a 1st polar body and a 2nd polar body, a power generation element is rotated by making a 1st direction into a rotating shaft. Just complete all connections.

  Accordingly, the connection process can be simplified and speeded up, and the production efficiency of the storage element can be improved.

  Further, the power generation element is formed by winding the first polar body, the second polar body, and the separator, and the third connection portion is formed from the winding shaft in the first direction. The end of the first polar body arranged between the outer sides of the power generation element is bundled by being shifted to one side in the first direction, and the fourth connecting portion is bundled with the first The ends of the first polar body arranged between the winding shaft and the other outer side of the power generation element in the direction are bundled together in the same direction as the deflection direction of the third connecting portion. It may be possible.

  According to this, for example, as shown in FIG. 5, when the third connecting portion is bundled by bundling a plurality of (substantially continuous one) first polar bodies to the outside of the power generation element, The 1st polar body arrange | positioned on the outer side may contact a 1st connection part in the widest area. Moreover, the area where the 1st polar body arrange | positioned innermost indirectly contacts with a 1st connection part by the part | minute of the winding thickness of an electric power generation element may reduce. That is, the contact area decreases from the outside toward the inside.

  On the other hand, in the fourth connection portion, the contact area of the first polar body arranged on the innermost side is maximized, and the contact area of the first polar body arranged on the outermost side is minimized. The contact area increases from the outside toward the inside.

  Here, since the power generation element is a winding type, the first polar body disposed outside the third connection portion and the first polar body disposed outside the fourth connection portion have an electrical distance. short. This relationship is the same between the insides. Accordingly, the total area of the contact areas of the adjacent third connection parts and the contact areas of the fourth connection parts that are short in electrical distance is substantially equal to the total area of the other winding positions.

  By being in the state as described above, it is possible to efficiently flow the electricity stored in the power generation element to the first current collector.

  Furthermore, the desired current collection efficiency can be maintained even if the length of each connecting portion of the power generating element is shortened.

  When the power generating element and the current collector are connected without shifting the current collecting foil that is the end in the winding axis direction of the first polar body and that constitutes the connecting portion as in the past, the winding start and end of winding of the power generating element In order to bring the current collection efficiency of this part closer to the central part of the winding (corresponding to the center of the bundle of current collector foils), the current collector foil located at the end of the current bundle of current collector foils is lengthened and the connection area is increased. I need to earn. For that purpose, the length of the connection part in the whole electric power generation element must be lengthened.

  In the structure of the present application, there is no difference in the current collection efficiency depending on the winding position as described above, and therefore there is no need to lengthen the connecting portion (current collection foil) for leveling the current collection efficiency.

  Therefore, the ratio of the area of the connection part in the electrode body can be reduced. Since the connection part is a part where the active material is not coated, if the area ratio of the connection part is reduced and the area ratio of the active material coating part is increased, the capacity of the power generation element can be improved. Become.

  In order to achieve the above object, a method for manufacturing a power storage device according to the present invention includes a film-shaped first electrode that is one of a negative electrode and a positive electrode, and a film-shaped second electrode that is the other. A power storage element manufacturing method for welding the first electrode body and the first current collector of a power generation element in which a body and a film-like separator are arranged in layers in a first direction so as to be electrically conductive The first current collector includes a first connection portion and a second connection portion that extend in a direction crossing the first direction and are arranged side by side in the first direction. A third connection part electrically connected to the first connection part and a fourth connection part electrically connected to the second connection part, the first connection part and the second connection part, The third connection portion is disposed between the first connection portion and the second connection portion, and the fourth connection portion is disposed outside the first connection portion and the second connection portion. A first disposing step of disposing an element and the first current collector; a first welding step of welding the first connecting portion; and the third connecting portion; the second connecting portion; And a second welding step for welding the four connecting portions.

  According to this, after connecting the first connection portion and the third connection portion by welding, the second connection portion and the third connection portion can be welded by the welding machine without inverting the power generation element, After welding one connection part and the third connection part, it is only necessary to relatively move the power generating element and the welding machine by the distance between the first connection part and the second connection part, and the next setting without rotation. Can be completed. Therefore, the connection process by welding can be simplified and shortened, and the production efficiency of the electricity storage element can be improved.

  And a second current collector electrically connected to the second pole body, the second current collector extending in a direction intersecting the first direction and arranged side by side in the first direction. And the second polar body is electrically connected to the seventh connection portion and the sixth connection portion that are electrically connected to the fifth connection portion. An eighth connection portion, and a rotation step for rotating the power generation element about the direction along the first direction, and the seventh connection portion between the fifth connection portion and the sixth connection portion. Arranged, the eighth connection part is arranged outside the fifth connection part and the sixth connection part, and the first connection part and the fifth connection part are arranged on the same side in the first direction. A second disposing step of disposing the power generation element and the second current collector, the fifth connecting portion, and the seventh connecting portion A third welding step of welding, the sixth connecting portions, and may include a fourth welding step of welding the eighth connection.

  According to this, even if it is a case where a 1st electrical power collector and a 2nd electrical power collector are connected to each of a 1st polar body and a 2nd polar body, a power generation element is rotated by making a 1st direction into a rotating shaft. Just complete all connections.

  Therefore, the welding process can be simplified and speeded up, and the production efficiency of the storage element can be improved.

  According to the present invention, it is possible to improve the production efficiency of the storage element.

FIG. 1 is a perspective view showing an external appearance of the power storage device of the present embodiment. FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the housing omitted. FIG. 3 is a side view schematically showing the power generation element. FIG. 4 is a side view schematically showing the power generation element from another direction. FIG. 5 is a plan view showing the power generation element in cross section from above. FIG. 6 is a perspective view showing both the first current collector and the second current collector. FIG. 7 is a plan view partially showing a state in which the power generation element and the current collector are connected. FIG. 8 is a plan view showing a partial cross section of the next state when connecting the power generation element and the current collector. FIG. 9 is a plan view partially showing a state in which the power generating element and the current collector are connected at different poles. FIG. 10 is a plan view showing a partial cross section of the next state when the power generating element and the current collector are connected at different poles. FIG. 11 is a plan view showing a power generation element in another aspect in cross section from above.

  Next, an embodiment of a power storage device according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed an example of the electrical storage element which concerns on this invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

  FIG. 1 is a perspective view showing an external appearance of the power storage device of the present embodiment.

  FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the housing omitted.

  As shown in these drawings, the power storage device 100 according to the present embodiment is a nonaqueous electrolyte secondary battery that can charge and discharge electricity, and includes a power generation element 101 and a casing 102. And a current collector 104.

  FIG. 3 is a side view schematically showing the power generation element.

  As shown in the figure, the power generation element 101 includes a film-shaped first electrode body 111 that is one of a negative electrode and a positive electrode, a film-shaped second electrode body 112 that is the other, and a film-shaped separator 119. Is a member which can be stored in layers in the first direction (X-axis direction in the figure) and can store electricity.

  In the case of the present embodiment, the negative electrode is obtained by forming a negative electrode active material layer on the surface of a long strip-shaped first polar body 111 made of copper. The positive electrode is obtained by forming a positive electrode active material layer on the surface of a long strip-shaped second polar body 112 made of aluminum. The separator 119 is a microporous sheet made of resin. The power generation element 101 is formed by winding a layered arrangement so that the separator 119 is sandwiched between the first polar body 111 and the second polar body 112 so that the whole becomes an oval shape. Has been.

  FIG. 4 is a side view schematically showing the power generation element from another direction.

  As shown in the figure, the power generation element 101 is formed in a state where the first polar body 111 and the second polar body 112 are displaced in the winding axis direction (Y-axis direction in the figure). The portion of the first pole body 111 protruding from the second pole body 112 and the portion of the second pole body 112 protruding from the first pole body 111 are electrically and physically connected to the current collector 104, respectively. It functions as a connecting portion 115 (a portion surrounded by a two-dot chain line in the figure). In the connection portion 115, a negative electrode active material or a positive electrode active material is not formed, and an aluminum foil or a copper foil is exposed.

  In addition, the separator 119 may be other members such as glass fiber as well as a resin.

  FIG. 5 is a plan view showing the power generation element in cross section from above.

  As shown in the figure, the connecting portions 115 are bundled in a state of being overlapped in the first direction (X-axis direction in the drawing). For illustration purposes, FIG. 5 shows the first pole body 111 and the second pole body 112 separated from each other at the connection portion 115, but in actuality they are overlapped and in close contact.

  In the case of the present embodiment, the first polar body 111 includes a third connection portion 113 disposed on one side of the winding shaft and a fourth connection portion 114 disposed on the other side of the winding shaft. Yes. The second polar body 112 includes a seventh connection portion 117 disposed on one side of the winding shaft and an eighth connection portion 118 disposed on the other side of the winding shaft.

 Further, the third connecting portion 113 is an end portion in the winding axis direction of the first polar body 111 disposed between the winding shaft and the outside of one of the power generating elements 101 (lower side in the figure) in the first direction. Are connected to one side in the first direction (lower side in the figure) and bundled. Similarly, in the first connection direction, the fourth connection portion 114 has a connection portion 115 arranged between the winding shaft and the outside of the other power generation element 101 (upper side in the drawing) in the same direction as the bias direction of the third connection portion. They are bundled together (lower side in the figure).

  Further, the seventh connecting portion 117 is bundled by bringing the connecting portion 115 into the same direction (lower side in the figure) as the direction of deviation of the third connecting portion. Similarly, the eighth connecting portion 118 is also bundled by aligning the connecting portion 115 in the same direction (lower side in the figure) as the direction of deviation of the third connecting portion.

  Note that the power generation element 101 can adopt not only a flat winding type but also an arbitrary lamination mode such as a folding type.

  The housing 102 is a member that houses the power generation element 101. In the case of the present embodiment, the housing 102 includes a container 120 and a lid 103.

  The container 120 is a rectangular (cuboid) member that houses the power generation element 101. The container 120 is made of aluminum or an alloy thereof, or made of thin stainless steel or the like for weight reduction. The container 120 includes a rectangular bottom portion, a rectangular long wall portion standing on each long side portion of the bottom portion, and a rectangular short wall portion standing on each short side portion of the bottom portion. Further, the container 120 constitutes the housing 102 together with the lid 103 by welding the opening end of the container 120 and the lid 103. The lid 103 is a metal plate-like member that closes the opening of the container 120.

  FIG. 6 is a perspective view showing both the first current collector and the second current collector.

  The current collector 104 is a member that is electrically connected to an electrode terminal 105 and a power generation element 101, which will be described later, and is also physically (mechanically) connected to the housing 102 (lid body 103). In the figure, for the sake of explanation, two current collectors 104 are shown close to each other, but in reality, the current collectors 104 are respectively arranged at the ends of the winding shafts of the power generating element 101. .

  In the case of the present embodiment, the current collector 104 is a metal plate-like member disposed in a bent state along the wall portion and the lid body 103 from the lid body 103 to the wall portion of the housing 102. The current collector 104 is fixedly connected to the lid body 103 together with the electrode terminals 105.

  The first current collector 143 that is the current collector 104 connected to the first pole body 111 of the power generation element 101 extends in a direction (Z-axis direction in the figure) intersecting the first direction (X-axis direction in the figure). And a rod-shaped first connecting portion 141 and a rod-shaped second connecting portion 142 arranged side by side in the first direction. The second current collector 144, which is the current collector 104 connected to the second pole body 112 of the power generation element 101, extends in a direction intersecting the first direction and is arranged in a row in the first direction. A fifth connecting portion 145 and a rod-like sixth connecting portion 146 are provided.

  Further, the first current collector 143 includes a base 147 provided with a band-like second connection portion 142 in a protruding state, and the surface of the second connection portion 142 is connected to the connection portion between the base 147 and the second connection portion 142. From the position along the first direction (X-axis direction in the figure) to the position where the fourth connecting portion 114 can come into surface contact, that is, the surface that was oriented in the Y-axis direction in the figure was twisted until it faced in the X-axis direction. A twisted portion 159 is provided. Similarly, the first connection portion 141 is also provided by being twisted with respect to the base portion 147. Further, the second current collector 144 also includes a base portion 148, and the fifth connection portion 145 and the sixth connection portion 146 also protrude in a twisted state with respect to the base portion 148.

  The first current collector 143 is made of copper, and the second current collector 144 is made of aluminum.

  In the power storage device 100 as described above, the power generation element 101 and the current collector 104 are arranged as follows. That is, the third connection portion 113 is disposed between the first connection portion 141 and the second connection portion 142, and the fourth connection portion 114 is disposed outside the first connection portion 141 and the second connection portion 142. Yes. In addition, a seventh connection portion 117 is disposed between the fifth connection portion 145 and the sixth connection portion 146, and an eighth connection portion 118 is disposed outside the fifth connection portion 145 and the sixth connection portion 146. Yes.

  In this case, the second connecting portion 142 is an end portion of the first polar body 111 and straddles the bent portion. Since the twisted portion 159 corresponds to the portion, the first polar body 111 is provided. It becomes possible to suppress interference with the edge part of this. The same applies to the sixth connection portion 146.

  In the case of the present embodiment, power storage element 100 further includes electrode terminal 105, fastener 108, first insulating member 109, and second insulating member (not shown).

  The electrode terminal 105 is a terminal for electrically connecting an external device, another battery, or the like to the power generation element 101 of the power storage element 100. In the case of this embodiment, the electrode terminal 105 is attached to the housing 102 in a penetrating manner while maintaining insulation with the housing 102, and the electrode terminal 105 for the negative electrode and the electrode terminal 105 for the positive electrode are two. It is attached to the housing 102.

  The electrode terminal 105 has a through hole. The through hole is a hole through which a fastener 108 for electrically connecting another device or the like to the electrode terminal 105 is inserted.

  Note that the housing 102 itself may function as an electrode terminal of one pole.

  The fastener 108 is a member for electrically and physically connecting a current-carrying member for electrically connecting an external device or other battery, for example, a current-carrying member such as a bus bar, to the electrode terminal 105. In the case of the present embodiment, the fastener is a bolt shape so that the energization member can be detachably fastened, and the electrode terminal 105 and the energization member are connected in a sandwiched state by tightening with a nut.

  The first insulating member 109 is a member that electrically insulates the housing 102 and the fastener 108 and the housing 102 and the electrode terminal 105. In the case of the present embodiment, the first insulating member 109 is a plate-like member formed of an insulator such as resin, and covers a part of the lid 103 and accommodates the head of the fastener 108. It has a shape.

  The second insulating member (not shown) is a member that electrically insulates the casing 102 and the current collector 104. In the case of the present embodiment, the second insulating member is a thin box-shaped member formed of an insulator such as a resin, and is inside the housing 102 (lid body 103) and includes the current collector 104 and the lid. It is arranged between the body 103.

  Next, the manufacturing method of the electrical storage element 100 is demonstrated.

  FIG. 7 is a plan view partially showing a state in which the power generation element and the current collector are connected.

  As shown in the figure, the third connection portion 113 of the first polar body 111 is disposed between the first connection portion 141 and the second connection portion 142 of the first current collector 143, and the first connection portion 141 The power generation element 101 and the first current collector 143 are arranged so that the fourth connection part 114 is arranged outside the second connection part 142 (first arrangement step).

  Using the tip 201 and the anvil 202 of the ultrasonic welding machine 200, the first connection part 141 and the third connection part 113 are sandwiched and welded (first welding step). At this time, the chip 201 that is connected to the horn and generates ultrasonic vibration is arranged on the first connection portion 141 side having a relatively large thickness. This is because the end of the first polar body 111 may be damaged if the chip 201 is disposed on the third connection portion 113 side.

  In addition, in the connection part 115 such as the third connection part 113, in order to maintain a state where the first polar body 111 and the second polar body 112 are overlapped and bundled, they may be sandwiched between conductive clips, In this case, the current collector 104 and the connection portion 115 are connected via a clip.

  Next, the tip 201 and the anvil 202 are separated from the power generation element 101 in the winding axis (Y-axis direction in the figure) direction in the first direction (X-axis direction in the figure) so that the state shown in FIG. ) To move the tip 201 and the anvil 202 relative to the power generation element 101, bring the tip 201 and the anvil 202 and the power generation element 101 closer to the direction of the winding axis (Y-axis direction in the drawing), And the 4th connection part 114 is inserted | pinched with the chip | tip 201 and the anvil 202. FIG. Then, ultrasonic welding is performed (second welding step).

  As described above, the relative movement between the tip 201 and the anvil 202 and the power generation element 101 is linear in the two axes of the winding axis direction (Y-axis direction) and the first direction (X-axis direction). Therefore, the operations of the chip 201 and the anvil 202 and the power generation element 101 can be performed at high speed with a simple device configuration.

  Next, after the tip 201, the anvil 202, and the power generation element 101 are separated from each other in the direction of the winding axis (Y-axis direction in the drawing) so that the state shown in FIG. 9 is obtained, the first direction (X-axis direction) is set. The power generating element 101 is rotated as a rotating shaft (rotating step). And the 7th connection part 117 is arrange | positioned between the 5th connection part 145 and the 6th connection part 146, and the 8th connection part 118 is arrange | positioned on the outer side of the 5th connection part 145 and the 6th connection part 146. Thus, the power generation element 101 and the current collector 104 are arranged. Here, it arrange | positions so that the 1st connection part 141 and the 5th connection part 145 may become the same side (lowermost side in FIG. 7, FIG. 9) in a 1st direction (2nd arrangement | positioning step).

  And using the chip | tip 201 and the anvil 202, the 5th connection part 145 and the 7th connection part 117 are inserted | pinched, and it ultrasonically welds (3rd welding step).

  Next, the tip 201, the anvil 202, and the power generation element 101 are separated from each other in the direction of the winding axis (Y-axis direction in the figure) so that the state shown in FIG. ) To move the tip 201 and the anvil 202 relative to the power generation element 101, bring the tip 201 and the anvil 202 and the power generation element 101 closer to the winding axis (Y-axis direction in the drawing) direction, And the 8th connection part 118 is inserted | pinched between the chip | tip 201 and the anvil 202, and ultrasonic welding is carried out (4th welding step).

  As described above, relative movement between the tip 201 and the anvil 202 and the power generation element 101 is relative to the X axis when the welding target is changed from the first polar body 111 to the second polar body 112 as a central axis. Rotation, the winding axis direction (Y-axis direction), and the first direction (X-axis direction) can be realized by only a linear operation. Can be implemented at high speed with a simple machine configuration.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, in the above-described embodiment, the connection portion 115 that is bundled together in one direction in the first direction is shown. However, the present invention is not limited to this, and as shown in FIG. But you can.

  Moreover, although the winding type electric power generation element 101 was shown, the electric power generation element 101 includes a film-shaped first electrode body 111 that is one of a negative electrode and a positive electrode, and a film-shaped second electrode body that is the other. 112 and the membrane separator 119 may be folded so as to be layered in the first direction. In this case, the winding axis does not exist, but is the middle of the folded first polar body 111 and second polar body 112 in the first direction, and the width of the band-shaped first polar body 111 and second polar body 112 A shaft extending in the direction can be an alternative to the winding shaft.

  Also, welding is not limited to ultrasonic welding, but welding from the side of the connecting portion 115 of the power generation element 101 such as laser welding or spot welding is different from welding from the current collector 104 side. It may be welded.

  The present invention can be used for power storage elements such as secondary batteries.

DESCRIPTION OF SYMBOLS 100 Power storage element 101 Power generation element 102 Case 103 Lid 104 Current collector 105 Electrode terminal 108 Fastener 109 First insulating member 111 First pole body 112 Second pole body 113 Third connection part 114 Fourth connection part 115 Connection part 117 Seventh connection portion 118 Eighth connection portion 119 Separator 120 Container 141 First connection portion 142 Second connection portion 143 First current collector 144 Second current collector 145 Fifth connection portion 146 Sixth connection portion 147 Base portion 148 Base portion 159 Twist part 200 Ultrasonic welding machine 201 Tip 202 Anvil

Claims (6)

A power generation element formed by winding a negative electrode and a film-shaped first polar body that is one of the positive electrodes, a film-shaped second polar body that is the other, and a film-shaped separator, and the first electrode A power storage device comprising a first current collector electrically connected to the body,
The first current collector is
A first connection portion and a second connection portion arranged in a first direction and extending in a direction intersecting the first direction;
The first polar body is:
It is arranged between the first connection part and the second connection part, the side facing the first connection part is welded to the first connection part, and the side opposite to the side facing the first connection part is A third connection portion that is not welded to the first current collector ;
The side that is disposed outside the first connection portion and the second connection portion in the first direction, the side facing the second connection portion is welded to the second connection portion, and the side facing the second connection portion The opposite side includes the first current collector and a fourth connection portion that is not welded ,
The third connection portion and the fourth connection portion are power storage elements that are different portions included in the same power generation element. The first current collector is
A base provided with the second connecting portion in a protruding state;
The torsion part twisted from the position which the surface of a 2nd connection part in the connection part of the said base part and a said 2nd connection part follows the said 1st direction to the position which can contact the said 4th connection part. The electricity storage device described. And a second current collector electrically connected to the second pole body,
The second current collector is
A fifth connection portion and a sixth connection portion that extend in a direction intersecting with the first direction and are arranged side by side in the first direction;
The second polar body is
It is arranged between the fifth connection part and the sixth connection part, the side facing the fifth connection part is welded to the fifth connection part, and the side opposite to the side facing the fifth connection part is A seventh connection portion that is not welded to the second current collector ;
The side that is disposed outside the fifth connection portion and the sixth connection portion in the first direction, the side facing the sixth connection portion is welded to the sixth connection portion, and the side facing the sixth connection portion The opposite side includes the second current collector and an eighth connection portion that is not welded ,
The electricity storage device according to claim 1 or 2, wherein the first connection portion and the fifth connection portion are disposed on the same side in the first direction. The third connection part is
In the first direction, the end in the winding axis direction of the first polar body arranged between the winding axis and one outer side of the power generation element is bundled together in one direction in the first direction,
The fourth connection portion is
In the first direction, the end in the winding axis direction of the first polar body arranged between the winding axis and the other outer side of the power generating element is pieced in the same direction as the biasing direction of the third connecting portion. The electrical storage element of any one of Claims 1-3 bundled together. The first polar body of a power generation element formed by winding a negative electrode and a film-shaped first polar body, which is one of the positive electrodes, and a film-shaped second polar body, which is the other, and a film-shaped separator. And the first current collector are welded so that they can be electrically connected,
The first current collector includes a first connection portion and a second connection portion that are arranged side by side in a first direction and extend in a direction intersecting the first direction,
The first polar body includes a third connection part electrically connected to the first connection part and a fourth connection part electrically connected to the second connection part,
The third connection part and the fourth connection part are different parts included in the same power generation element,
The third connection part is disposed between the first connection part and the second connection part, and the fourth connection part is disposed outside the first connection part and the second connection part in the first direction. A first arrangement step of arranging the power generating element and the first current collector to be arranged;
A first welding step of welding the first current collector and the third connection part;
A second welding step of welding the first current collector and the fourth connection part ,
In the first welding step, the first connection portion and the side of the third connection portion facing the first connection portion are welded, and the side of the third connection portion facing the first connection portion is The other side is not welded to the first current collector,
In the second welding step, the second connection part and the side of the fourth connection part facing the second connection part are welded, and the side of the fourth connection part facing the second connection part is The other side is not welded to the first current collector
Manufacturing method of a charge reservoir element. And a second current collector electrically connected to the second pole body,
The second current collector includes a fifth connection portion and a sixth connection portion that extend in a direction intersecting the first direction and are arranged side by side in the first direction,
The second polar body includes a seventh connection part electrically connected to the fifth connection part and an eighth connection part electrically connected to the sixth connection part,
A rotation step of rotating the power generation element about the direction along the first direction;
The seventh connection portion is disposed between the fifth connection portion and the sixth connection portion, and the eighth connection portion is disposed outside the fifth connection portion and the sixth connection portion in the first direction. A second disposing step of disposing the power generating element and the second current collector so that the first connecting portion and the fifth connecting portion are disposed on the same side in the first direction;
A third welding step of welding the second current collector and the seventh connection portion;
A fourth welding step of welding the second current collector and the eighth connection portion ,
In the third welding step, the fifth connection portion and the side of the seventh connection portion facing the fifth connection portion are welded, and the side of the seventh connection portion facing the fifth connection portion is The other side is not welded to the second current collector,
In the fourth welding step, the sixth connection part and the side of the eighth connection part facing the sixth connection part are welded, and the side of the eighth connection part facing the sixth connection part is The other side is not welded to the second current collector
Method for manufacturing a power storage device according to 請 Motomeko 5.

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