JP6155724B2 - Power storage device and method for manufacturing power storage device - Google Patents

Description

  The present invention relates to a power storage device including a plurality of electrode bodies, electrode terminals, a plurality of electrode bodies and a current collector electrically connected to the electrode terminals, and a method for manufacturing the same.

  The shift from gasoline cars to electric cars has become important as a global environmental problem. For this reason, development of an electric vehicle using a power storage element such as a lithium ion secondary battery as a power source is being promoted. Such a power storage device generally includes an electrode body having a positive electrode and a negative electrode, an electrode terminal, and a current collector that electrically connects the electrode body and the electrode terminal.

  Here, conventionally, for example, a power storage element used in a hybrid electric vehicle (HEV) that performs charge / discharge at a high rate cycle includes a plurality of electrode bodies, and the current collector is provided with the plurality of electrode bodies. There has been proposed a configuration for connecting to (for example, see FIG. 6 of Patent Document 1).

JP 2012-156134 A

  However, the conventional power storage device has a problem in that the operation of connecting the current collector to the electrode body is complicated in a configuration having a plurality of electrode bodies.

  That is, in the conventional power storage element disclosed in Patent Document 1 (FIG. 6 and the like), a current collector (flexible current collector) having two electrode bodies (electrode assemblies) and two current collector leads. ), One current collector lead is connected to one electrode body, and the other current collector lead is connected to the other electrode body. For this reason, it is necessary to connect two current collecting leads to two electrode bodies. That is, since it is necessary to perform the joining operation twice in order to connect the current collector to the two electrode bodies, the operation of connecting the current collector to the electrode bodies becomes complicated.

  The present invention has been made to solve the above problems, and provides a power storage device that can easily connect a current collector to an electrode body and a method for manufacturing the same in a configuration having a plurality of electrode bodies. For the purpose.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a plurality of electrode bodies having a positive electrode and a negative electrode and arranged in parallel in a first direction, an electrode terminal, the plurality of electrode bodies, An electrical storage element including a current collector electrically connected to the electrode terminal, wherein each of the plurality of electrode bodies is a stacked portion in which active portions of the positive electrode or the negative electrode are not formed. And a plurality of stacked portions extending in a second direction intersecting the first direction in parallel with the first direction, and the current collector is a plurality of the stacked portions included in the plurality of electrode bodies. Among the plurality of laminated portions arranged in parallel in the first direction, the two laminated portions adjacent to each other and joined to the inner laminated portion pair that is two laminated portions included in different electrode bodies, A joining portion extending in the second direction, wherein the joining portion is the inner laminated portion; It is joined bundled with.

  According to this, the electrical storage element includes a plurality of electrode bodies having a plurality of laminated portions, and the current collector is adjacent to two adjacent electrodes included in different electrode bodies among the plurality of laminated portions of the plurality of electrode bodies. It has the junction part bundled and joined with the inner side lamination | stacking part pair which is one lamination | stacking part. In other words, the joint portion is joined to two stacked portions included in the two electrode bodies. For this reason, a collector can be joined to two electrode bodies by one joining operation which joins a joined part to two lamination parts. Therefore, in a power storage element having a plurality of electrode bodies, a current collector can be easily connected to the electrode bodies.

  Moreover, the said junction part may be arrange | positioned between the two laminated parts contained in the said inner side laminated part pair, and may be bundled and joined with the said two laminated parts.

  According to this, the joining part is disposed and joined so as to be sandwiched between the two laminated parts. For this reason, since it is only necessary to perform the joining operation with the joining portion sandwiched between the two electrode bodies, the current collector can be easily joined to the electrode body.

  Further, the current collector further includes a terminal connection portion arranged on the electrode terminal side, and the terminal connection is performed so that the joint portion hangs down from the side of the terminal connection portion in the second direction. It may be formed by being bent without being twisted from the part.

  According to this, the junction part of the current collector is bent and formed without being twisted so as to hang down from the side of the terminal connection part. That is, since the current collector has a simple shape such as a flat plate member bent, the current collector can be easily manufactured. Further, since the joint portion is formed by being bent without being twisted from the terminal connection portion, it is not necessary to avoid interference between the twisted portion and the electrode body. In other words, when a current collector is manufactured by twisting, it is necessary to form the laminated portion of the electrode body in order to avoid the twisted portion from interfering with the electrode body. Since the body is manufactured without being twisted, it is not necessary to form the laminated portion. For this reason, in the said electrical storage element, a collector can be easily connected to an electrode body.

  The current collector is formed so as to hold two electrode bodies having two stacked portions included in the inner stacked portion pair by bonding the bonding portion to the inner stacked portion pair. You may decide to be.

  According to this, the current collector is formed so as to hold the joined electrode body. Here, the current collector disclosed in Patent Document 1 does not have a function of holding the electrode body because the flexible current collector lead is connected to the electrode body. For this reason, the said electrical storage element can be equipped with the electrical power collector which also has the function to hold | maintain an electrode body.

  Further, the plurality of electrode bodies have a plurality of the inner laminated portion pairs, and the current collector is joined to each of the two inner laminated portion pairs of the plurality of inner laminated portion pairs. You may decide to have two said junction parts.

  According to this, the current collector has two joint portions that are respectively joined to the two inner laminated portion pairs. That is, when the power storage element includes three or more electrode bodies and thus has two or more inner laminated portion pairs, the current collector has two joint portions. Thereby, the current collector can be connected to more electrode bodies. In addition, since the number of joints is two, the joints can be formed without being twisted, so that the current collector can be easily manufactured, and the current collector can be easily used as an electrode body. Can be connected to.

  Further, two laminated portions included in the inner laminated portion pair different from the two inner laminated portion pairs among the plurality of inner laminated portion pairs may be bundled and joined.

  According to this, the two laminated parts included in the inner laminated part pair that is not joined to the joint part are bundled and joined. That is, since the laminated portions included in the adjacent electrode bodies are bundled and joined, the gap between the adjacent electrode bodies can be closed. Here, in the case where a gap is generated between adjacent electrode bodies, for example, when joining the joined portion to the laminated portion by ultrasonic welding, there is a possibility that foreign matters such as metal foil dust enter the gap. In particular, when dust moves from the negative electrode side to the positive electrode side (the copper piece moves to the aluminum side), the capacity of the power storage element may be reduced. For this reason, in the said electrical storage element, since the clearance gap between adjacent electrode bodies is block | closed, it can suppress that foreign materials, such as dust of metal foil, move, and can aim at prevention of a capacity | capacitance fall. Moreover, the electrical balance of the said adjacent electrode bodies can also be maintained by bundling the laminated parts of the adjacent electrode bodies.

  Moreover, you may decide that the two laminated parts contained in the said different inner laminated part pair are joined by welding or caulking.

  According to this, the two laminated parts included in the inner laminated part pair that is not joined to the joint part are joined by welding or caulking. That is, the two laminated portions can be easily joined by utilizing welding such as ultrasonic welding and resistance welding or caulking.

  Further, the current collector is not bonded to two stacked portions arranged at both ends in the first direction among the plurality of stacked portions of the plurality of electrode bodies, and the collector You may decide to join with the inner side lamination | stacking part pair.

  According to this, the current collector is not joined to the two stacked portions arranged at both ends. That is, by joining the joining portion to the inner laminated portion, it is not necessary to join the outer laminated portion, so that the number of joining operations can be reduced.

  In addition, the plurality of stacked portions included in each of the plurality of electrode bodies are arranged in the first direction formed by winding and stacking a non-formation portion of the active material layer of the positive electrode or the negative electrode. There may be two stacked portions, and the joint portion may be bundled and bonded to the inner stacked portion pair of the plurality of stacked portions formed of the two stacked portions.

  According to this, since a plurality of electrode bodies are winding type electrode bodies, each electrode body can form two lamination parts simply by winding an electrode.

  In order to achieve the above object, a method for manufacturing a power storage device according to one embodiment of the present invention includes a plurality of electrode bodies having a positive electrode and a negative electrode and arranged in parallel in a first direction, the electrode terminals, A power storage element manufacturing method comprising a plurality of electrode bodies and a current collector electrically connected to the electrode terminals, wherein each of the plurality of electrode bodies is a non-active material layer of the positive electrode or the negative electrode. The forming part is a stacked part, and has a plurality of stacked parts extending in a second direction intersecting the first direction in parallel in the first direction. Two stacked layers included in different electrode bodies that are two adjacent stacked portions among the plurality of stacked portions arranged in parallel in the first direction, which are the plurality of stacked portions included in the plurality of electrode bodies. The second side of the current collector on the inner laminated part pair which is a part Disposed adjacent the joint portion extending in comprising a joint arrangement step, the joint portion, and a joining portion joining step of joining bundles and the inner stacked unit pair.

  According to this, in the method for manufacturing a power storage element, the junction portion of the current collector is disposed adjacent to two adjacent stacked portions included in different electrode bodies among the multiple stacked portions of the plurality of electrode bodies. The joining portion is bundled and joined with the two laminated portions. For this reason, a collector can be joined to two electrode bodies by one joining operation which joins a joined part to two lamination parts. Therefore, in the method for manufacturing the power storage element, the current collector can be easily connected to the electrode body.

  In addition, the method further includes a current collector forming step of forming the current collector by bending the joint portion without twisting from the side of the terminal connection portion disposed on the electrode terminal side of the current collector. May be.

  According to this, in the method for manufacturing the electricity storage device, the current collector is formed by bending the joint portion from the side of the terminal connection portion without twisting. That is, since the current collector has a simple shape such as a flat plate member bent, the current collector can be easily manufactured. Further, since the current collector is formed without twisting, it is not necessary to form the laminated portion in order to avoid interference between the twisted portion and the electrode body. For this reason, in the manufacturing method of the said electrical storage element, a collector can be easily connected to an electrode body.

  According to the electricity storage device of the present invention, a current collector can be easily connected to an electrode body in a configuration having a plurality of electrode bodies.

It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. It is a perspective view which shows each component with which the main body of the container of the electrical storage element which concerns on embodiment of this invention isolate | separates, and an electrical storage element is provided. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage element which concerns on embodiment of this invention. It is a perspective view which shows the structure of the positive electrode electrical power collector which concerns on embodiment of this invention. It is a figure for demonstrating the manufacturing process of the positive electrode electrical power collector which concerns on embodiment of this invention. It is a perspective view which shows the structure by which the positive electrode collector and negative electrode collector which concern on embodiment of this invention are joined to the 1st electrode body and the 2nd electrode body. It is sectional drawing which shows the structure by which the positive electrode collector and negative electrode collector which concern on embodiment of this invention are joined to the 1st electrode body and the 2nd electrode body. It is a side view which shows the structure by which the positive electrode collector and negative electrode collector which concern on embodiment of this invention are joined to the 1st electrode body and the 2nd electrode body. It is a flowchart which shows the manufacturing method of the electrical storage element which concerns on embodiment of this invention. It is sectional drawing which shows the structure by which the positive electrode collector and negative electrode collector which concern on the modification 1 of embodiment of this invention are joined to a 1st electrode body and a 2nd electrode body. It is a perspective view which shows the structure by which a positive electrode collector and a negative electrode collector are joined to an electrode body, when the electrical storage element which concerns on the modification 2 of embodiment of this invention is provided with three electrode bodies. It is a perspective view which shows the structure of the positive electrode electrical power collector which concerns on the modification 2 of embodiment of this invention. It is sectional drawing which shows the structure by which a positive electrode collector and a negative electrode collector are joined to an electrode body, when the electrical storage element which concerns on the modification 2 of embodiment of this invention is provided with three electrode bodies. It is a perspective view which shows the structure by which a positive electrode collector and a negative electrode collector are joined to an electrode body, when the electrical storage element which concerns on the modification 3 of embodiment of this invention is provided with four electrode bodies. It is sectional drawing which shows the structure by which a positive electrode collector and a negative electrode collector are joined to an electrode body in the case where the electrical storage element which concerns on the modification 3 of embodiment of this invention is provided with four electrode bodies.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment)
First, the configuration of the power storage element 10 will be described.

  FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing each component included in power storage element 10 by separating main body 111 of container 100 of power storage element 10 according to the embodiment of the present invention. FIG. 3 is an exploded perspective view showing each component when the power storage device 10 according to the embodiment of the present invention is disassembled. In FIG. 3, the main body 111 of the container 100 is omitted.

  The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In particular, the electric storage element 10 is applied to a hybrid electric vehicle (HEV) that performs charging and discharging at a high rate cycle. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

  As shown in these drawings, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. Further, inside the container 100, a positive electrode current collector 120, a negative electrode current collector 130, and a first electrode body 140 and a second electrode body 150 which are two electrode bodies are accommodated.

  In addition, a liquid such as an electrolytic solution (non-aqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

  The container 100 includes a main body 111 having a rectangular cylindrical shape and a bottom, and a lid 110 that is a plate-like member that closes an opening of the main body 111. Moreover, the container 100 can seal an inside by accommodating the 1st electrode body 140, the 2nd electrode body 150 grade | etc., Inside, and the lid body 110 and the main body 111 being welded. Yes. The material of the lid 110 and the main body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel.

  The first electrode body 140 and the second electrode body 150 are two power generation elements arranged in parallel, and are both electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. Here, the direction (Y-axis direction) in which the first electrode body 140 and the second electrode body 150 are arranged in parallel will be referred to as the first direction below. In addition, since the 1st electrode body 140 and the 2nd electrode body 150 have the same structure, below, it demonstrates centering on the description of the 1st electrode body 140, and the description about the 2nd electrode body 150 is abbreviate | omitted or simplified. Turn into.

  The first electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. In the positive electrode, a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy. The negative electrode is obtained by forming a negative electrode active material layer on a negative electrode substrate foil, which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of resin.

  Here, the positive electrode active material used for the positive electrode active material layer or the negative electrode active material used for the negative electrode active material layer may be a known material as long as it is a positive electrode active material or a negative electrode active material capable of occluding and releasing lithium ions. Can be used.

  And the 1st electrode body 140 is formed by winding what was arrange | positioned in layers so that a separator may be pinched | interposed between a negative electrode and a positive electrode. In the drawing, the shape of the first electrode body 140 is an ellipse, but it may be a circle or an ellipse. Further, the shape of the first electrode body 140 is not limited to the winding type, and may be a shape in which flat plate plates are laminated. A detailed description of the configuration of the first electrode body 140 and the second electrode body 150 will be described later.

  As described above, since the electricity storage element 10 has a plurality of electrode bodies (two electrode bodies in the present embodiment), compared to the case where a single electrode body is used for the container 100 having the same volume (volume). It is preferable in the following points. That is, by using a plurality of electrode bodies, the dead space in the corner portion of the container 100 is reduced and the ratio of the electrode bodies is improved as compared with the case of using a single electrode body, leading to an increase in the capacity of the power storage element 10. . In particular, in an electrode body for high input / output (high rate), it is necessary to reduce the amount of active material on the metal foil as compared with a high capacity type electrode body. The proportion increases. For this reason, when a single electrode body is used, the number of turns of the electrode is increased, so that it is hard and flexible and difficult to insert into the container 100. However, by using a plurality of electrode bodies, the number of turns in one electrode body is increased. And an electrode body with high flexibility can be realized.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the first electrode body 140 and the positive electrode of the second electrode body 150, and the negative electrode terminal 300 is the negative electrode of the first electrode body 140 and the second electrode body 150. It is an electrode terminal electrically connected to the negative electrode. That is, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the first electrode body 140 and the second electrode body 150 to the external space of the power storage element 10, and the first electrode body 140 and the second electrode It is a metal electrode terminal for introducing electricity into the internal space of the electricity storage element 10 in order to store electricity in the body 150.

  Further, the positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the first electrode body 140 and the second electrode body 150. Specifically, as shown in FIG. 3, the positive electrode terminal 200 has a protruding portion 210 inserted into the through hole 110 a of the lid body 110 and the through hole 121 a of the positive electrode current collector 120, and is caulked. Along with the current collector 120, the lid 110 is fixed. Similarly, in the negative electrode terminal 300, the protruding portion 310 is inserted into the through hole 110 b of the lid body 110 and the through hole 131 a of the negative electrode current collector 130 and caulked, so that the lid body 110 together with the negative electrode current collector 130 is inserted. Fixed to. In addition, although packing etc. are also arrange | positioned, it abbreviate | omits and shows in the same figure.

  The positive electrode current collector 120 is disposed between the positive electrode of the first electrode body 140 and the positive electrode of the second electrode body 150, and is electrically connected to the positive electrode terminal 200 and the positive electrodes of the first electrode body 140 and the second electrode body 150. It is a member provided with the electroconductivity and rigidity connected to. The positive electrode current collector 120 is made of aluminum or an aluminum alloy, like the positive electrode base foils of the first electrode body 140 and the second electrode body 150.

  The negative electrode current collector 130 is disposed between the negative electrode of the first electrode body 140 and the negative electrode of the second electrode body 150, and is electrically connected to the negative electrode terminal 300 and the negative electrodes of the first electrode body 140 and the second electrode body 150. It is a member provided with the electroconductivity and rigidity connected to. The negative electrode current collector 130 is made of copper or a copper alloy, like the negative electrode base foils of the first electrode body 140 and the second electrode body 150.

  Next, the structure of the positive electrode current collector 120 and the negative electrode current collector 130 will be described in detail. In addition, since the positive electrode current collector 120 and the negative electrode current collector 130 have the same configuration, the following description will focus on the positive electrode current collector 120, and the description of the negative electrode current collector 130 will be omitted or simplified. Turn into.

  FIG. 4 is a perspective view showing the configuration of the positive electrode current collector 120 according to the embodiment of the present invention. Moreover, FIG. 5 is a figure for demonstrating the manufacturing process of the positive electrode electrical power collector 120 which concerns on embodiment of this invention.

  As shown in FIG. 4, the positive electrode current collector 120 includes a terminal connection part 121 and a joint part 122.

  The terminal connection part 121 is a flat plate-like part disposed on the positive electrode terminal 200 side (Z-axis plus side). The terminal connection part 121 is formed with a through hole 121a into which the protruding part 210 of the positive electrode terminal 200 is inserted. That is, the terminal connecting portion 121 is fixed to the lid 110 by inserting the protruding portion 210 into the through hole 110 a and caulking with the lid 110.

  The joint portion 122 is a rod-like member connected to the end portion of the terminal connection portion 121. Specifically, the joint portion 122 is a flat plate-like member extending in the second direction arranged so as to hang down from the side of the terminal connection portion 121 in the second direction, and is joined to an inner laminated portion pair described later. . Here, the second direction is a direction that intersects the first direction (Y-axis direction), and in the present embodiment, is the Z-axis direction.

  That is, the joint portion 122 is a member that extends in the Z-axis direction from the central portion of the end portion of the terminal connection portion 121, and has a surface parallel to the XZ plane. The second direction is not limited to the Z-axis direction, and may be any direction that intersects the Y-axis direction.

  Further, as shown in FIG. 5, the joint portion 122 is formed by being bent without being twisted from the terminal connection portion 121. That is, the joint part 124 before being bent is disposed in the same plane (XY plane) as the terminal connection part 121, and the joint part 124 is bent in the negative direction of the Z axis, thereby being perpendicular to the terminal connection part 121. A joining portion 122 extending in a specific direction (Z-axis direction) is formed.

  Next, a configuration in which the positive electrode current collector 120 and the negative electrode current collector 130 are joined to the first electrode body 140 and the second electrode body 150 will be described in detail. In the following, the configuration in which the positive electrode current collector 120 is bonded to the first electrode body 140 and the second electrode body 150 and the negative electrode current collector 130 are bonded to the first electrode body 140 and the second electrode body 150 are also described. Therefore, the following description will be focused on the description of the positive electrode current collector 120, and the description of the negative electrode current collector 130 will be omitted or simplified.

  FIG. 6 is a perspective view showing a configuration in which the positive electrode current collector 120 and the negative electrode current collector 130 according to the embodiment of the present invention are joined to the first electrode body 140 and the second electrode body 150.

  FIG. 7 is a cross-sectional view illustrating a configuration in which the positive electrode current collector 120 and the negative electrode current collector 130 according to the embodiment of the present invention are joined to the first electrode body 140 and the second electrode body 150. Specifically, this figure shows a state in which the positive electrode current collector 120 and the negative electrode current collector 130 shown in FIG. 6 are joined to the first electrode body 140 and the second electrode body 150 in a plane parallel to the XY plane. It is sectional drawing which shows the cross section at the time of cut | disconnecting.

  FIG. 8 is a side view showing a configuration in which the positive electrode current collector 120 and the negative electrode current collector 130 according to the embodiment of the present invention are joined to the first electrode body 140 and the second electrode body 150. Specifically, FIG. 6A shows the state in which the positive electrode current collector 120 and the negative electrode current collector 130 shown in FIG. 6 are joined to the first electrode body 140 and the second electrode body 150 in the Y-axis minus direction. It is a side view at the time of seeing from a direction. FIG. 6B shows the state in which the positive electrode current collector 120 and the negative electrode current collector 130 shown in FIG. 6 are joined to the first electrode body 140 and the second electrode body 150 as viewed from the Y axis plus direction. FIG.

  As shown in these drawings, each of the first electrode body 140 and the second electrode body 150 is a laminated portion in which a non-formation portion of a positive electrode or negative electrode active material layer is laminated, and has a first direction (Y-axis A plurality of stacked portions extending in parallel in the first direction extend in the second direction (the Z-axis direction in the present embodiment) intersecting with the (direction).

  That is, in the first electrode body 140 and the second electrode body 150, the positive electrode and the negative electrode are shifted from each other in the direction of the winding axis (in this embodiment, a virtual axis parallel to the X-axis direction) via the separator. It is wound. And the positive electrode and the negative electrode have the part (active material layer non-formation part) in which the active material layer is not formed in the edge part of each shifted direction.

  Specifically, the positive electrode has a stacked portion in which a non-forming portion of the positive electrode active material layer is stacked at one end in the winding axis direction (end portion in the X-axis plus direction). Further, the negative electrode has a laminated portion in which a non-formation portion of the negative electrode active material layer is laminated on the other end in the winding axis direction (end portion in the X-axis minus direction). That is, the positive electrode-side laminated portion is formed by the exposed metal foil layer of the positive electrode, and the negative electrode-side laminated portion is formed by the exposed metal foil layer of the negative electrode.

  In addition, the thickness of the positive electrode metal foil and the negative electrode metal foil is, for example, any value of 5 μm to 20 μm. Further, these metal foils form a laminated portion by stacking 40 or less sheets such as 30 sheets.

  As described above, the first electrode body 140 has, on the positive electrode side, the first positive electrode stack portion 141 and the second positive electrode stack portion 142 that are two stack portions arranged in the first direction as a plurality of stack portions. ing. In addition, the second electrode body 150 includes, on the positive electrode side, a third positive electrode stacked portion 151 and a fourth positive electrode stacked portion 152 that are two stacked portions arranged in the first direction as a plurality of stacked portions.

  That is, the first positive electrode laminate portion 141 and the second positive electrode laminate portion 142 are a metal foil group in which positive electrode base foils on which no positive electrode active material layer is formed are laminated among the positive electrodes of the first electrode body 140. The third positive electrode laminate portion 151 and the fourth positive electrode laminate portion 152 are a metal foil group in which positive electrode base foils on which the positive electrode active material layer is not formed among the positive electrodes of the second electrode body 150 are laminated.

  The joining portion 122 of the positive electrode current collector 120 is a plurality of stacked portions included in the first electrode body 140 and the second electrode body 150 and is adjacent to each other among the plurality of stacked portions arranged in parallel in the first direction. It is joined to the inner laminated part pair which is two laminated parts which are two laminated parts included in different electrode bodies. That is, of the first positive electrode stacked portion 141, the second positive electrode stacked portion 142, the third positive electrode stacked portion 151, and the fourth positive electrode stacked portion 152, two stacked portions that are adjacent to each other and are included in different electrode bodies. The second positive electrode laminate portion 142 and the third positive electrode laminate portion 151 which are the parts are an inner laminate portion pair, and the joint portion 122 is joined to the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151.

  Specifically, the joining portion 122 is bundled and joined with the inner laminated portion pair. More specifically, the joining portion 122 is disposed between the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151 that are two stacked portions included in the inner stacked portion pair, and the two stacked portions and Bundled and joined. In other words, the joint portion 122 is disposed between the second positive electrode stack portion 142 and the third positive electrode stack portion 151 so as to extend in the second direction along the second positive electrode stack portion 142 and the third positive electrode stack portion 151. And bundled and joined to the second positive electrode stacking part 142 and the third positive electrode stacking part 151.

  Bundling and joining refers to binding the current collector and the metal foil group of the base material foil of the electrode body, and welding and caulking such as ultrasonic welding and resistance welding, This refers to joining metal foil groups.

  That is, the second positive electrode stacking portion 142, the joint portion 122, and the third positive electrode stacking portion 151 are bundled and fixed by welding, caulking, or the like in the region R1, so that the second positive electrode stacking portion 142, the joint portion 122, The third positive electrode laminate 151 is joined.

  Similarly, on the negative electrode side, the first electrode body 140 includes a first negative electrode laminate portion 143 and a second negative electrode laminate portion 144 arranged in the first direction. Further, the second electrode body 150 has a third negative electrode laminate portion 153 and a fourth negative electrode laminate portion 154 arranged in the first direction. That is, the first negative electrode laminate portion 143 and the second negative electrode laminate portion 144 are a metal foil group in which negative electrode base foils in which the negative electrode active material layer is not formed among the negative electrodes of the first electrode body 140 are laminated. In addition, the third negative electrode laminate 153 and the fourth negative electrode laminate 154 are a metal foil group in which negative electrode base foils on which no negative electrode active material layer is formed are laminated among the negative electrodes of the second electrode body 150.

  Of the first negative electrode laminate 143, the second negative electrode laminate 144, the third negative electrode laminate 153, and the fourth negative electrode laminate 154, two adjacent laminates included in different electrode bodies The second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 are the inner laminate portion pair, and the joint portion 132 is joined to the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153.

  Specifically, the bonding portion 132 is interposed between the second negative electrode stack portion 144 and the third negative electrode stack portion 153 so as to extend in the second direction along the second negative electrode stack portion 144 and the third negative electrode stack portion 153. The second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 are bundled and joined.

  That is, the second negative electrode laminate portion 144, the joint portion 132, and the third negative electrode laminate portion 153 are bundled and fixed by welding, caulking, or the like in the region Q1, so that the second negative electrode laminate portion 144, the joint portion 132, The third negative electrode laminate 153 is joined.

  Thus, since the 1st electrode body 140 and the 2nd electrode body 150 are winding type electrode bodies, the some laminated part which each of the 1st electrode body 140 and the 2nd electrode body 150 has is a positive electrode or a negative electrode These are two laminated portions arranged in the first direction formed by winding and laminating the active material layer non-formed portions. And the junction part of a positive electrode or a negative electrode is bundled and joined with the inner side lamination | stacking part pair among the several lamination | stacking parts comprised by the said 2 lamination | stacking part.

  In addition, the positive electrode current collector 120 is not joined to two stacked portions disposed at both ends in the first direction among the multiple stacked portions of the first electrode body 140 and the second electrode body 150, It is joined to the inner laminated portion pair at the joint portion 122.

  That is, the junction 122 is a first positive electrode that is two stacked portions disposed at both ends of the first positive electrode stacked portion 141, the second positive electrode stacked portion 142, the third positive electrode stacked portion 151, and the fourth positive electrode stacked portion 152. The laminated portion 141 and the fourth positive electrode laminated portion 152 are not joined.

  Similarly, on the negative electrode side, the joining portion 132 includes two pieces disposed at both ends of the first negative electrode laminate portion 143, the second negative electrode laminate portion 144, the third negative electrode laminate portion 153, and the fourth negative electrode laminate portion 154. The first negative electrode multilayer portion 143 and the fourth negative electrode multilayer portion 154 that are the multilayer portions are not joined.

  In addition, the positive electrode current collector 120 and the negative electrode current collector 130 are configured to hold two electrode bodies having two stacked portions included in the inner stacked portion pair by joining the bonded portions to the inner stacked portion pair. Is formed. That is, in the positive electrode current collector 120 and the negative electrode current collector 130, the joint portion 122 is joined to the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151, and the joint portion 132 is joined to the second negative electrode laminate portion 144 and the third negative electrode. The first electrode body 140 and the second electrode body 150 are suspended and held by being joined to the stacked portion 153.

  Next, the manufacturing method of the electrical storage element 10 is demonstrated.

  FIG. 9 is a flowchart showing a method for manufacturing power storage device 10 according to the embodiment of the present invention. Specifically, this figure is a flowchart for explaining a process of joining the positive electrode current collector 120 and the negative electrode current collector 130 to the first electrode body 140 and the second electrode body 150. In the following, the step of bonding the positive electrode current collector 120 to the first electrode body 140 and the second electrode body 150 and the step of bonding the negative electrode current collector 130 to the first electrode body 140 and the second electrode body 150 are also described. Therefore, in the following description, the description of the positive electrode current collector 120 will be mainly given, and the description of the negative electrode current collector 130 will be omitted or simplified.

  As shown in the figure, first, as a current collector forming step, the positive electrode current collector 120 is bent from the side of the terminal connection part 121 disposed on the positive electrode terminal 200 side of the positive electrode current collector 120 without twisting the positive electrode current collector. The electric body 120 is formed (S102).

  That is, as described above, the positive electrode current collector 120 shown in FIG. 4 is formed by bending a flat member as shown in FIG. Similarly, the negative electrode current collector 130 is also formed.

  Next, as a joining portion arranging step, two adjacent laminated layers among the plurality of laminated portions of the first electrode body 140 and the second electrode body 150 that are arranged in parallel in the first direction. The joining portion 122 extending in the second direction of the positive electrode current collector 120 is disposed adjacent to the inner laminated portion pair that is the two laminated portions included in the different electrode bodies (S104).

  That is, as illustrated in FIGS. 6 to 8, the joining portion 122 is disposed between the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151 that are two stacked portions included in the inner stacked portion pair. Similarly, the joining portion 132 of the negative electrode current collector 130 is also disposed between the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153.

  Next, as a bonding portion bonding step, the bonding portion 122 is bundled and bonded to the inner laminated portion pair (S106).

  That is, as described above, as illustrated in FIGS. 6 to 8, the bonding portion 122 is bundled and bonded to the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151. Similarly, the joining portion 132 of the negative electrode current collector 130 is also bundled and joined with the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153.

  As described above, according to the electric storage element 10 according to the embodiment of the present invention, the first electrode body 140 and the second electrode body 150 which are a plurality of electrode bodies having a plurality of stacked portions are provided. The electric body 120 and the negative electrode current collector 130 are adjacent two stacked portions included in different electrode bodies among the plurality of stacked portions of the first electrode body 140 and the second electrode body 150 which are a plurality of electrode bodies. It has joints 122 and 132 that are bundled and joined with an inner laminated part pair. That is, each of the joint portions 122 and 132 is joined to two stacked portions included in the first electrode body 140 and the second electrode body 150 which are two electrode bodies. For this reason, the positive electrode current collector 120 or the negative electrode current collector 130 can be bonded to the two electrode bodies in a single bonding operation in which the bonding portions are bonded to the two stacked portions. Therefore, in the electricity storage element 10 having a plurality of electrode bodies, a current collector can be easily connected to the plurality of electrode bodies.

  In addition, each of the joint portions 122 and 132 is disposed and joined so as to be sandwiched between two stacked portions. For this reason, since it is only necessary to perform the joining operation with the joining portion sandwiched between the two electrode bodies, the current collector can be easily joined to the electrode body.

  Moreover, by disposing the bonding portion between the two stacked portions, the number of metal foils in one stacked portion to be bonded to the bonded portion can be reduced, and the active material layer of the electrode body necessary for bonding is not formed. The width of the portion (for example, the length in the X-axis direction of the second positive electrode laminate portion 142 and the second negative electrode laminate portion 144 shown in FIG. 8) can be reduced. For this reason, the coating part of the active material layer of the electrode body (for example, the length in the X-axis direction excluding the second positive electrode laminate part 142 and the second negative electrode laminate part 144 of the first electrode body 140 shown in FIG. 8) is used. Can be wide. Thereby, since the electrode area of an electrode body can be enlarged, the internal resistance of the electrical storage element 10 can be reduced and a capacity | capacitance can be increased.

  Further, the joint portions 122 and 132 are formed without being twisted so as to hang down from the side of the terminal connection portions 121 and 131. That is, since the positive electrode current collector 120 and the negative electrode current collector 130 have simple shapes such as a flat plate member bent, the positive electrode current collector 120 and the negative electrode current collector 130 can be easily manufactured. . Further, since the joint portions 122 and 132 are formed by being bent from the terminal connection portions 121 and 131 without being twisted, it is not necessary to avoid interference between the twisted portion and the electrode body. That is, when the current collector is manufactured by twisting, it is necessary to form the laminated portion of the electrode body in order to prevent the twisted portion from interfering with the electrode body. Since the body is manufactured without being twisted, it is not necessary to form the laminated portion. For this reason, in the electrical storage element 10, a collector can be easily connected to an electrode body.

  The positive electrode current collector 120 and the negative electrode current collector 130 are formed to hold the first electrode body 140 and the second electrode body 150. Here, the current collector disclosed in Patent Document 1 does not have a function of holding the electrode body because the flexible current collector lead is connected to the electrode body. For this reason, in the electrical storage element 10, the electrical power collector which also has the function to hold | maintain an electrode body can be provided.

  Further, each of the positive electrode current collector 120 and the negative electrode current collector 130 is not joined to the two stacked portions disposed at both ends. That is, by joining the joining portions 122 and 132 to the inner laminated portion, it is not necessary to join the outer laminated portion, so that the number of joining operations can be reduced.

  Moreover, since the 1st electrode body 140 and the 2nd electrode body 150 which are several electrode bodies are winding type electrode bodies, each 1st electrode body 140 and the 2nd electrode body 150 wind an electrode. Thus, two stacked portions can be formed easily.

  In addition, according to the method for manufacturing power storage device 10 according to the embodiment of the present invention, the first electrode body 140 and the second electrode body 150 which are a plurality of electrode bodies are included in different electrode bodies among the plurality of stacked portions. In the two adjacent stacked portions, a joint portion of the positive electrode current collector 120 or the negative electrode current collector 130 is disposed adjacently, and the joint portion is bundled and joined to the two stacked portions. For this reason, the positive electrode current collector 120 or the negative electrode current collector 130 can be bonded to the two electrode bodies in a single bonding operation in which the bonding portions are bonded to the two stacked portions. Therefore, in the method for manufacturing the power storage element 10, the current collector can be easily connected to the electrode body.

  Further, in the method for manufacturing the storage element 10, the positive electrode current collector 120 and the negative electrode current collector 130 are formed by bending the joint portions 122 and 132 without twisting from the side of the terminal connection portions 121 and 131. That is, since the positive electrode current collector 120 and the negative electrode current collector 130 have simple shapes such as a flat plate member bent, the current collector can be easily manufactured. Further, since the current collector is formed without twisting, it is not necessary to form the laminated portion in order to avoid interference between the twisted portion and the electrode body. For this reason, in the manufacturing method of the electrical storage element 10, a collector can be easily connected to an electrode body.

(Modification 1)
Next, Modification 1 of the above embodiment will be described.

  FIG. 10 is a cross-sectional view illustrating a configuration in which the positive electrode current collector 120a and the negative electrode current collector 130a according to Modification 1 of the embodiment of the present invention are joined to the first electrode body 140 and the second electrode body 150. . Specifically, this figure shows a cross section when the positive electrode current collector 120a and the negative electrode current collector 130a are joined to the first electrode body 140 and the second electrode body 150, cut along a plane parallel to the XY plane. FIG.

  As shown in the figure, the joining portion 122a is disposed on the outer side (Y-axis direction minus side) of the second positive electrode laminate portion 142 so as to extend in the second direction along the second positive electrode laminate portion 142, and It is bundled and joined to the second positive electrode layered portion 142 and the third positive electrode layered portion 151. That is, the joining part 122a is bundled with the second positive electrode laminated part 142 and the third positive electrode laminated part 151 outside the second positive electrode laminated part 142 and the third positive electrode laminated part 151, and is welded or caulked in the region R2. It is joined by fixing.

  Similarly, the joining portion 132a is disposed on the outer side (Y-axis direction plus side) of the third negative electrode laminate portion 153 so as to extend in the second direction along the third negative electrode laminate portion 153. The laminated portion 144 and the third negative electrode laminated portion 153 are bundled and joined. That is, the joining portion 132a is bundled with the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 outside the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153, and is welded or caulked in the region Q2. It is joined by fixing.

  In addition, the joining part 122a is arrange | positioned so that it may extend in the 2nd direction along the 3rd positive electrode laminated part 151, and is arrange | positioned on the outer side (Y-axis direction plus side) of the 2nd positive electrode laminated part 142, and the 2nd positive electrode laminated part 142. In addition, the third positive electrode laminated portion 151 may be bundled and joined.

  Similarly, the joining portion 132a is disposed on the outer side (minus side in the Y-axis direction) of the second negative electrode stack portion 144 so as to extend in the second direction along the second negative electrode stack portion 144, and the second negative electrode stack portion 144 and the third negative electrode laminate 153 may be bundled and joined.

  As described above, the above-described implementation is also achieved by the configuration in which the positive electrode current collector 120a and the negative electrode current collector 130a according to the first modification of the embodiment of the present invention are joined to the first electrode body 140 and the second electrode body 150. The same effect as that of the embodiment can be obtained.

(Modification 2)
Next, a second modification of the above embodiment will be described.

  FIG. 11 is a perspective view showing a configuration in which the positive electrode current collector 120b and the negative electrode current collector 130b are joined to the electrode body when the power storage device according to the second modification of the embodiment of the present invention includes three electrode bodies. It is. FIG. 12 is a perspective view showing a configuration of positive electrode current collector 120b according to Modification 2 of the embodiment of the present invention.

  FIG. 13 shows a configuration in which the positive electrode current collector 120b and the negative electrode current collector 130b are joined to the electrode body when the power storage device according to the second modification of the embodiment of the present invention includes three electrode bodies. It is sectional drawing. Specifically, this figure shows a cross section when the positive electrode current collector 120b and the negative electrode current collector 130b shown in FIG. 11 are joined to three electrode bodies and cut along a plane parallel to the XY plane. It is sectional drawing.

  As shown in these drawings, the electricity storage device according to this modification includes a first electrode body 140, a second electrode body 150, and a third electrode body 160, which are three electrode bodies. As shown in FIG. 12, the positive electrode current collector 120b includes a terminal connection portion 121b and two joint portions 122b and 123b connected to the three electrode bodies. Note that the same applies to the negative electrode current collector 130b, and a detailed description thereof will be omitted.

  The terminal connection part 121b is a flat plate-like part disposed on the positive electrode terminal 200 side (Z-axis plus side). Since the terminal connection part 121b is the same as the terminal connection part 121 of the positive electrode current collector 120 in the above embodiment, detailed description thereof is omitted.

  The two joint portions 122b and 123b are rod-shaped members connected to both side surface portions of the terminal connection portion 121b. Specifically, the two joint portions 122b and 123b are flat plate-like members extending in the second direction and arranged so as to hang down in the second direction from the opposite side surface portions of the terminal connection portion 121b. That is, the two joint portions 122b and 123b are members extending in the Z-axis direction, and have faces parallel to the XZ plane. The second direction is not limited to the Z-axis direction, and may be any direction that intersects the Y-axis direction.

  Further, the two joint portions 122b and 123b are formed by being bent without being twisted from opposite side surface portions of the terminal connection portion 121b. That is, the joint portions 122b and 123b are arranged in the same plane (XY plane) as the terminal connection portion 121b before being bent, and are bent in the negative direction of the Z axis so as to be perpendicular to the terminal connection portion 121b ( Joints 122b and 123b extending in the Z-axis direction) are formed.

  The positive electrode current collector 120b and the negative electrode current collector 130b are a plurality of stacked portions of the first electrode body 140, the second electrode body 150, and the third electrode body 160, and are in the first direction (Y-axis direction). Among the plurality of stacked portions arranged in parallel, the two adjacent stacked portions are joined to the inner stacked portion pair that is two stacked portions included in different electrode bodies.

  In other words, the joint 122b of the positive electrode current collector 120b is disposed between the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151 which are the inner stacked portion pair, and the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151b. They are joined together by being bundled with the laminated portion 151 and being fixed by welding or caulking in the region R3. Further, the joint portion 122b is disposed between the fourth positive electrode stacked portion 152 and the fifth positive electrode stacked portion 161, which are the inner stacked portion pair, and is bundled with the fourth positive electrode stacked portion 152 and the fifth positive electrode stacked portion 161. In the region R4, fixing is performed by welding or caulking.

  As described above, when the power storage element has three or more electrode bodies, the plurality of electrode bodies have a plurality of inner laminated portion pairs, and the positive electrode current collector 120b has a plurality of inner sides. Two joint portions 122b and 123b are respectively joined to two inner laminated portion pairs of the laminated portion pairs. The same applies to the negative electrode current collector 130b.

  As described above, the same effect as that of the above embodiment can be obtained by the configuration in which the positive electrode current collector 120b and the negative electrode current collector 130b according to the second modification of the embodiment of the present invention are joined to the three electrode bodies. Can play. In particular, each of the positive electrode current collector 120b and the negative electrode current collector 130b has two joint portions that are joined to the two inner laminated portion pairs, respectively. That is, when the power storage element includes three or more electrode bodies and thus has two or more inner laminated portion pairs, the current collector has two joint portions. Thereby, the current collector can be connected to more electrode bodies. In addition, since the number of joints is two, the joints can be formed without being twisted, so that the current collector can be easily manufactured, and the current collector can be easily used as an electrode body. Can be connected to.

(Modification 3)
Next, Modification 3 of the above embodiment will be described.

  FIG. 14 is a perspective view showing a configuration in which the positive electrode current collector 120c and the negative electrode current collector 130c are joined to the electrode body when the power storage device according to the third modification of the embodiment of the present invention includes four electrode bodies. It is. FIG. 15 shows a configuration in which the positive electrode current collector 120c and the negative electrode current collector 130c are joined to the electrode body when the power storage device according to the third modification of the embodiment of the present invention includes four electrode bodies. It is sectional drawing. Specifically, this figure shows a cross section when the state in which the positive electrode current collector 120c and the negative electrode current collector 130c shown in FIG. 14 are bonded to four electrode bodies is cut along a plane parallel to the XY plane. It is sectional drawing.

  As shown in these drawings, the power storage device according to the present modification includes a first electrode body 140, a second electrode body 150, a third electrode body 160, and a fourth electrode body 170, which are four electrode bodies. . Further, the positive electrode current collector 120c includes two joint portions 122c and 123c connected to the electrode body, and the negative electrode current collector 130c includes two joint portions 132c and 133c connected to the electrode body. I have. In addition, since the positive electrode current collector 120c and the negative electrode current collector 130c have the same configuration as that of the second modification, detailed description thereof is omitted.

  Here, the positive electrode current collector 120c and the negative electrode current collector 130c are a plurality of stacked portions of the first electrode body 140, the second electrode body 150, the third electrode body 160, and the fourth electrode body 170, and Among the plurality of stacked portions arranged in parallel in the direction (Y-axis direction), the two adjacent stacked portions are joined to the inner stacked portion pair that is two stacked portions included in different electrode bodies.

  In other words, the junction 122c of the positive electrode current collector 120c is disposed between the second positive electrode stacked portion 142 and the third positive electrode stacked portion 151 that are the inner stacked portion pair, and the second positive electrode stacked portion 142 and the third positive electrode stacked portion. They are joined together by being bundled with the laminated portion 151 and being fixed by welding or caulking in the region R5. In addition, the joint portion 122c is disposed between the sixth positive electrode stacked portion 162 and the seventh positive electrode stacked portion 171 that are the inner stacked portion pair, and is bundled with the sixth positive electrode stacked portion 162 and the seventh positive electrode stacked portion 171. In the region R6, fixing is performed by welding or caulking.

  As described above, when the power storage element includes four or more electrode bodies, the plurality of electrode bodies includes three or more inner laminated portion pairs, and two junctions of the positive electrode current collector 120c. The portions 122c and 123c are respectively joined to two inner laminated portion pairs of the three or more inner laminated portion pairs. Then, two laminated portions included in the inner laminated portion pair different from the two inner laminated portion pairs joined to the joining portions 122c and 123c of the plurality of inner laminated portion pairs of three or more are bundled and joined. ing.

  Specifically, the fourth positive electrode stacked portion 152 and the fifth positive electrode stacked portion 161 that are two stacked portions included in the inner stacked portion pair that is not bonded to the bonding portions 122c and 123c are bundled and bonded. Yes.

  Here, bundled and joined means that, as described above, the metallic foil groups of the base foil of the electrode body are bundled together, and the metallic foil groups are joined together by welding such as ultrasonic welding and resistance welding or caulking. To do. That is, the fourth positive electrode laminate portion 152 and the fifth positive electrode laminate portion 161 are joined by bundling the fourth positive electrode laminate portion 152 and the fifth positive electrode laminate portion 161 and performing fixing by welding or caulking in the region R7. To do.

  Also, on the negative electrode side, the negative electrode current collector 130c is bonded to the electrode body, and the two laminated portions that are not bonded to the negative electrode current collector 130c are also bonded. Since it is the same structure as the joining on the positive electrode side, detailed description is omitted.

  In this modification, the power storage element includes four electrode bodies, but the power storage element may include five or more electrode bodies. Even in this case, the two joint portions of the current collector are joined to the two inner laminate portion pairs at both ends, respectively, and the two laminate portions included in the inner laminate portion pair not joined to the two joint portions are joined. The

  As described above, the same effect as that of the above embodiment can be obtained by the configuration in which the positive electrode current collector 120c and the negative electrode current collector 130c according to the third modification of the embodiment of the present invention are joined to the four electrode bodies. Can play. In particular, the two stacked portions included in the inner stacked portion pair that are not bonded to the bonded portion of the positive electrode current collector 120c and the negative electrode current collector 130c are bundled and bonded. That is, since the stacked portions included in the second electrode body 150 and the third electrode body 160 that are adjacent electrode bodies are bundled and joined, the gap between the adjacent electrode bodies can be closed. . Here, in the case where a gap is generated between adjacent electrode bodies, for example, when joining the joined portion to the laminated portion by ultrasonic welding, there is a possibility that foreign matters such as metal foil dust enter the gap. In particular, when dust moves from the negative electrode side to the positive electrode side (the copper piece moves to the aluminum side), the capacity of the power storage element may be reduced. For this reason, in the electrical storage element according to the present modification, the gap between the adjacent electrode bodies is closed, so that the movement of foreign matters such as dust on the metal foil can be suppressed and the reduction in capacity can be prevented. . Moreover, the electrical balance of the said adjacent electrode bodies can also be maintained by bundling the laminated parts of the adjacent electrode bodies.

  Moreover, the two laminated parts included in the inner laminated part pair that are not joined to the joined part of the positive electrode current collector 120c and the negative electrode current collector 130c are joined by welding or caulking. That is, the two laminated portions can be easily joined by utilizing welding such as ultrasonic welding and resistance welding or caulking.

  Although the power storage device according to the embodiment of the present invention and the modification thereof has been described above, the present invention is not limited to the above-described embodiment and the modification.

  In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention. For example, the modification 2 or 3 may be modified according to the modification 1.

  Moreover, in the said embodiment and its modification, although the junction part and laminated | stacked part of the electrical power collector, or the laminated parts were joined by welding or caulking, the joining method is limited to welding or caulking. Instead, they may be joined by any method.

  Moreover, in the said modification 3, although two laminated parts contained in the inner side laminated part pair which is not joined with the junction part of an electrical power collector were joined, the said two laminated parts are joined. It does not matter.

  Moreover, in the said embodiment and its modification, although the lamination | stacking part was decided to be a lamination | stacking part in a winding type electrode body, even if it is a lamination | stacking part in the lamination | stacking type electrode body which laminated | stacked the flat electrode plate. Good. That is, a portion where the active material layer non-forming portion of the electrode in the stacked electrode body is stacked may be divided into a plurality of portions to form a plurality of stacked portions.

  The present invention is applicable to power storage elements such as lithium ion secondary batteries.

DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110 Cover body 110a, 110b Through-hole 111 Main body 120, 120a, 120b, 120c Positive electrode collector 121, 121b Terminal connection part 121a, 131a Through-hole 122, 122a, 122b, 123b, 122c, 123c, 124 Junction part 130, 130a, 130b, 130c Negative electrode current collector 132, 132a, 132b, 133b, 132c, 133c Junction part 140 First electrode body 141 First positive electrode laminate part 142 Second positive electrode laminate part 143 First negative electrode laminate part 144 Second negative electrode laminate portion 150 Second electrode body 151 Third positive electrode laminate portion 152 Fourth positive electrode laminate portion 153 Third negative electrode laminate portion 154 Fourth negative electrode laminate portion 160 Third electrode body 161 Fifth positive electrode laminate portion 162 Sixth positive electrode laminate Part 163 Fifth negative electrode laminate part 164 Sixth negative electrode laminate part 17 0 4th electrode body 171 7th positive electrode laminated part 172 8th positive electrode laminated part 173 7th negative electrode laminated part 174 8th negative electrode laminated part 200 Positive electrode terminal 210 Protruding part 300 Negative electrode terminal 310 Protruding part

Claims (11)

An energy storage device comprising a plurality of electrode bodies having a positive electrode and a negative electrode, arranged in parallel in a first direction, an electrode terminal, and a current collector electrically connected to the plurality of electrode bodies and the electrode terminal There,
Each of the plurality of electrode bodies is a stacked portion in which non-forming portions of the active material layer of the positive electrode or the negative electrode are stacked, and the stacked portion extending in the second direction intersecting the first direction is the first Have multiple parallel in one direction,
The current collector is a plurality of the stacked portions of the plurality of electrode bodies, and is an adjacent two stacked portions among the plurality of stacked portions arranged in parallel in the first direction, and different electrodes. Having one joint extending in the second direction, which is joined to the pair of inner laminates that are two laminates included in the body,
The joint portion is joined together bundled with both of the two laminated portions included in the inner stack section pairs,
The current collector is not joined to the two laminated portions arranged at both ends in the first direction among the plurality of laminated portions of the plurality of electrode bodies, and the inner laminated layer is not joined to the current collector. A power storage element joined to the pair. The power storage device according to claim 1, wherein the joining portion is disposed between two laminated portions included in the inner laminated portion pair, and is bundled and joined to the two laminated portions. The current collector further has a terminal connection portion disposed on the electrode terminal side,
The power storage device according to claim 1, wherein the joint portion is formed by being bent without being twisted from the terminal connection portion so as to hang down in the second direction from a side of the terminal connection portion. The current collector is formed so as to hold two electrode bodies having two stacked portions included in the inner stacked portion pair by bonding the bonding portion to the inner stacked portion pair. Item 4. The electricity storage device according to any one of Items 1 to 3. The plurality of electrode bodies have a plurality of the inner laminated portion pairs,
5. The power storage device according to claim 1, wherein the current collector includes two joint portions that are respectively joined to two of the plurality of inner laminated portion pairs. . The power storage element according to claim 5, wherein two stacked portions included in an inner stacked portion pair different from the two inner stacked portion pairs among the plurality of inner stacked portion pairs are bundled and joined. The electric storage element according to claim 6, wherein the two laminated portions included in the different inner laminated portion pairs are joined by welding or caulking. Each of the plurality of stacked portions included in each of the plurality of electrode bodies includes two layers arranged in the first direction formed by winding and stacking the non-formation portions of the active material layer of the positive electrode or the negative electrode. Laminating part,
The power storage device according to claim 1, wherein the joining portion is bundled and joined with the inner laminated portion pair of the plurality of laminated portions configured by the two laminated portions. . A power storage device comprising a plurality of electrode bodies having a positive electrode and a negative electrode and arranged in parallel in a first direction, an electrode terminal, and a current collector electrically connected to the plurality of electrode bodies and the electrode terminal A manufacturing method comprising:
Each of the plurality of electrode bodies is a stacked portion in which non-forming portions of the active material layer of the positive electrode or the negative electrode are stacked, and the stacked portion extending in the second direction intersecting the first direction is the first Have multiple parallel in one direction,
The manufacturing method of the electricity storage element is:
Two of the plurality of stacked portions included in the plurality of electrode bodies, the two stacked portions arranged in parallel in the first direction, two adjacent stacked portions included in different electrode bodies A joining portion arranging step of placing one joining portion extending in the second direction of the current collector adjacent to the inner laminated portion pair that is a laminated portion; and
Said joint, and a joint portion joining step for both bundled and joined with both of the said two laminated portions included in the inner stack section pairs,
In the joining part joining step, the current collector is joined to the two laminated parts arranged at both ends in the first direction among the plurality of laminated parts of the plurality of electrode bodies, A method for manufacturing a power storage element that is joined to the inner laminated portion pair at a joint. further,
The current collector forming step of forming the current collector by bending the joint portion without twisting from the side of the terminal connection portion arranged on the electrode terminal side of the current collector. A method for manufacturing a storage element.   An energy storage device comprising a plurality of electrode bodies having a positive electrode and a negative electrode, arranged in parallel in a first direction, an electrode terminal, and a current collector electrically connected to the plurality of electrode bodies and the electrode terminal There,
  Each of the plurality of electrode bodies is a stacked portion in which non-forming portions of the positive electrode or the negative electrode active material layer are stacked, and has a stacked portion extending in a second direction intersecting the first direction. ,
  In the second direction, the current collector is bonded to two stacked portions included in different electrode bodies, which are adjacent to each other among the stacked portions of the plurality of electrode bodies. One extending joint,
  The joint part is bundled and joined together with both of the two laminated parts.
  Power storage element.

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