JP2014182900A - Power storage element and method for manufacturing power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of easily connecting a collector to an electrode body in a structure having a plurality of electrode bodies.SOLUTION: In a power storage element 10 having a first electrode body 140 and a second electrode body 150 that are a plurality of electrode bodies arranged parallel to a first direction, and a positive electrode body 120, each of the plurality of electrode bodies has a plurality of laminated parts that are laminated parts formed by laminating non-formation parts of active material layer of the positive electrode and extend in a second direction crossing the first direction and arranged parallel to the first direction, the positive electrode body 120 has two junction parts 122, 123 extending to the second direction and bonded to a first positive electrode laminated part 141 and a fourth laminated electrode part 152 respectively that are two laminated parts arranged on both edges among the plurality of laminated parts arranged parallel to the first direction that are the plurality of laminated parts included in the plurality of electrode bodies, and two junction parts 122, 123 are bundled and bonded to the first positive electrode laminated part 141 and the fourth positive electrode laminated part 152.

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. The structure connected to is proposed (for example, refer to Patent Document 1).

JP 2011-108644 A

  However, the conventional power storage device has a problem that it is difficult to connect a current collector to an electrode body in a configuration having a plurality of electrode bodies.

  In other words, the conventional power storage element disclosed in Patent Document 1 includes two electrode bodies (electrode assemblies) and a current collector having two current collecting leads, and an edge portion of one electrode body. One current collecting lead is connected to the other electrode body, and the other current collecting lead is connected to the edge portion of the other electrode body. For this reason, it is necessary to connect one current collecting lead to the edge portion of one electrode body. However, since a large number of metal foils are laminated on the edge portion of one electrode body, It is difficult to connect the current collecting lead to the number of metal foils by welding or the like.

  The present invention has been made to solve the above problem, and provides a power storage element that can easily connect a current collector to an electrode body in a configuration having a plurality of electrode bodies, and a method for manufacturing the same. 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. Two joints extending in the second direction that are joined to each of the outer laminate parts that are two laminate parts arranged at both ends of the plurality of laminate parts arranged in parallel in the first direction. Each of the two outer laminated portions has the two joint portions. Bundled and are joined.

  According to this, the power storage element includes a plurality of electrode bodies having a plurality of stacked portions, and the current collector is formed of two stacked portions disposed at both ends of the plurality of stacked portions of the plurality of electrode bodies. It has two joint parts which are bundled and joined together. That is, the bonding portion is bonded to one of the plurality of stacked portions included in the electrode body. Here, in the case where the bonding portion is bonded to a plurality of stacked portions included in the electrode body, it is necessary to bundle and bond a very large number of metal foils and the bonded portions, but the bonded portion is bonded to one stacked portion. Therefore, what is necessary is just to bundle a small number of metal foil, and a junction part, and to join. For this reason, in a power storage device having a plurality of electrode bodies, a current collector can be easily connected to the electrode bodies.

  The current collector further includes a terminal connection portion disposed on the electrode terminal side, and the two joint portions hang down in the second direction from opposite side surface portions of the terminal connection portion. It may be arranged.

  According to this, the two joint portions of the current collector are arranged so as to hang down from the opposite side surface portions of the terminal connection portion. 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, the two joint portions may be formed by being bent without being twisted from opposite side surface portions of the terminal connection portion.

  According to this, since the two joint portions are 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.

  Further, the current collector is not joined to the inner laminated portion, which is a laminated portion different from the two outer laminated portions, of the plurality of laminated portions of the plurality of electrode bodies, and the two joined members A portion may be joined to the two outer laminated portions.

  According to this, since it is only necessary to join each of the two joining portions of the current collector to the laminated portions at both ends, welding work can be performed from the outside, and the current collector can be easily attached to the laminated portion of the electrode body. Can be joined.

  Further, two inner laminated portions that are adjacent to each other among the plurality of laminated portions and are included in different electrode bodies may be bundled and joined.

  According to this, since the inner 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 inner side laminated parts of the adjacent electrode bodies.

  The two inner laminated portions may be joined by welding or caulking.

  According to this, two inner laminated parts can be easily joined by utilizing welding and caulking such as ultrasonic welding and resistance welding.

  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. The two laminated portions, and the two joining portions are bundled and joined to each of the two outer laminated portions of the plurality of laminated portions constituted by the two laminated portions. Also good.

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

  The power storage element includes a first electrode body and a second electrode body, which are two electrode bodies, as the plurality of electrode bodies, and the first electrode body includes the first electrode body as the plurality of stacked portions. A first laminated portion and a second laminated portion that are two laminated portions arranged in the direction, and the second electrode body is a second laminated portion arranged in the first direction as the plurality of laminated portions. The three laminated parts and the fourth laminated part, and the two joined parts are bundled and joined with the first laminated part and the fourth laminated part as the two outer laminated parts, The second laminated portion and the third laminated portion may be bundled and joined.

  According to this, in the case where the power storage element includes two electrode bodies, the two joining portions are bundled and joined to each of the two outer laminated portions, and the inner laminated portions are also bundled together. Being joined. In this way, the electrode body and the current collector can be easily joined.

  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. Each of the plurality of stacked portions of the plurality of electrode bodies, and each of the outer stacked portions that are two stacked portions disposed at both ends among the plurality of stacked portions disposed in parallel in the first direction, Adjacent two junctions extending in the second direction of the current collector Placing Te comprises a joint arrangement step, the two junctions, and a joint portion joining step of joining a bundle with each of the two outer laminate.

  According to this, in the method for manufacturing the power storage element, two junction portions of the current collector are arranged adjacent to each of the two stacked portions at both ends of the plurality of stacked portions of the plurality of electrode bodies, Two joining portions are bundled and joined to each of the two laminated portions. That is, since the joining portion is joined to one of the plurality of laminated portions of the electrode body, a small number of metal foils and the joining portion may be bundled and joined. For this reason, in the manufacturing method of the said electrical storage element, a collector can be easily connected to an electrode body.

  Further, the current collector forming step of forming the current collector by bending the two joint portions without twisting them from the opposite side surface portions of the terminal connection portion arranged on the electrode terminal side of the current collector. May be included.

  According to this, in the method for manufacturing the electricity storage element, the current collector is formed by bending the two joint portions from 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.

  Furthermore, two adjacent inner laminates included in different electrode bodies among the inner laminate portions that are different from the two outer laminate portions of the plurality of laminate portions included in the plurality of electrode bodies. You may decide to include the inner side lamination | stacking part joining process of bundling parts and joining.

  According to this, in the method for manufacturing a power storage element, the inner laminated portions included in the adjacent electrode bodies are bundled and joined. For this reason, in the manufacturing method of the said electrical storage element, since the gap | interval between adjacent electrode bodies is 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 inner side laminated parts of the adjacent electrode bodies.

  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.

  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 electrodes of the first electrode body 140 and the second electrode body 150 and the side wall of the main body 111 of the container 100, and the positive electrode terminal 200, the first electrode body 140, and the second electrode body 150. This is a member having electrical conductivity and rigidity that are electrically connected to the positive electrode. 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 electrodes of the first electrode body 140 and the second electrode body 150 and the side wall of the main body 111 of the container 100, and the negative electrode terminal 300, the first electrode body 140, and the second electrode body 150. This is a member having electrical conductivity and rigidity that are electrically connected to the negative electrode. 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 portion 121 and two joint portions 122 and 123.

  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 two joint portions 122 and 123 are rod-shaped members connected to both side surface portions of the terminal connection portion 121. Specifically, the two joint portions 122 and 123 are flat plate-like members extending in the second direction and arranged so as to hang down from the opposite side surface portions of the terminal connection portion 121 in the second direction. Joined to each of the parts. 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 two joint portions 122 and 123 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, as shown in FIG. 5, the two joint portions 122 and 123 are formed by being bent without being twisted from opposite side surface portions of the terminal connection portion 121. That is, the joint portions 124 and 125 before being bent are arranged in the same plane (XY plane) as the terminal connection portion 121, and the joint portions 124 and 125 are bent in the negative direction of the Z-axis, thereby connecting the terminals. Joint portions 122 and 123 extending in a direction (Z-axis direction) perpendicular to the portion 121 are 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 two joining portions 122 and 123 of the positive electrode current collector 120 are a plurality of laminated portions included in the first electrode body 140 and the second electrode body 150 and are arranged in parallel in the first direction. Are joined to each of the outer laminated parts which are two laminated parts arranged at both ends. That is, the first positive electrode stacking unit 141, the second positive electrode stacking unit 142, the third positive electrode stacking unit 151, and the fourth positive electrode stacking unit 152 are arranged at both ends of the first positive electrode stacking unit 141 and the fourth positive electrode stacking unit 152. It is an outer laminated portion, and the joining portions 122 and 123 are joined to the first positive electrode laminated portion 141 and the fourth positive electrode laminated portion 152, respectively.

  Specifically, the two joining portions 122 and 123 are bundled and joined to the first positive electrode laminate portion 141 and the fourth positive electrode laminate portion 152 as two outer laminate portions. That is, the joining part 122 is arranged on the outer side (Y axis direction minus side) of the first positive electrode laminate part 141 so as to extend in the second direction along the first positive electrode laminate part 141, and the first positive electrode laminate part 141. It is bundled and joined. In addition, the joining portion 123 is disposed on the outer side (Y-axis direction plus side) of the fourth positive electrode laminate portion 152 so as to extend in the second direction along the fourth positive electrode laminate portion 152, and the fourth positive electrode laminate portion 152. It is bundled and joined.

  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 joining portion 122 and the first positive electrode laminate portion 141 are bundled and fixed by welding, caulking, or the like in the region R1, thereby joining the joint portion 122 and the first positive electrode laminate portion 141. Similarly, the joining portion 123 and the fourth positive electrode stacking portion 152 are bundled and fixed by welding or caulking in the region R2, thereby joining the joining portion 123 and the fourth positive electrode stacking portion 152.

  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.

  And the 1st negative electrode laminated part 143, the 2nd negative electrode laminated part 144, the 3rd negative electrode laminated part 153, and the 1st negative electrode laminated part 143 and the 4th negative electrode laminated part 154 arranged at both ends among the 4th negative electrode laminated parts 154 are provided. The two laminated portions 132 and 133 of the negative electrode current collector 130, which are outer laminated portions, are joined to the first negative electrode laminated portion 143 and the fourth negative electrode laminated portion 154, respectively.

  Specifically, the joining portion 132 is disposed on the outer side (Y-axis direction minus side) of the first negative electrode laminate portion 143 so as to extend in the second direction along the first negative electrode laminate portion 143. The laminated portion 143 is bundled and joined. In addition, the joint portion 133 is disposed on the outer side (Y axis direction plus side) of the fourth negative electrode stack portion 154 so as to extend in the second direction along the fourth negative electrode stack portion 154, and the fourth negative electrode stack portion 154. It is bundled and joined.

  That is, the joining portion 132 and the first negative electrode laminate portion 143 are bundled and fixed by welding or caulking in the region Q1, thereby joining the joint portion 132 and the first negative electrode laminate portion 143. Similarly, the joint 133 and the fourth negative electrode laminate 154 are bundled and fixed by welding, caulking, or the like in the region Q2, thereby joining the joint 133 and the fourth negative electrode laminate 154.

  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. Then, the two joint portions of the positive electrode or the negative electrode are bundled and joined to each of the two outer laminated portions of the plurality of laminated portions constituted by the two laminated portions.

  Further, the positive electrode current collector 120 is not joined to the inner laminated portion which is a different laminated portion from the two outer laminated portions among the plural laminated portions of the first electrode body 140 and the second electrode body 150. Two joint portions 122 and 123 are joined to the two outer laminated portions.

  That is, the first positive electrode stacking unit 141, the second positive electrode stacking unit 142, the third positive electrode stacking unit 151, and the fourth positive electrode stacking unit 152, which are the outer stacked units, the first positive electrode stacking unit 141 and the fourth positive electrode stacking unit 152, The different second positive electrode laminate portion 142 and third positive electrode laminate portion 151 are the inner laminate portions, and the joint portions 122 and 123 are not joined to the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151.

  And two inner laminated parts included in the first electrode body 140 and the second electrode body 150 which are two adjacent inner laminated parts and are different electrode bodies among the plural laminated parts are bundled and joined. Yes. Specifically, the second positive electrode stacked portion 142 included in the first electrode body 140 and the third positive electrode stacked portion 151 included in the second electrode body 150, which are two adjacent inner stacked portions, are bundled. Are joined.

  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.

  In other words, the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151 are bundled and fixed by welding, caulking, or the like in the region R3, so that the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151 are connected. Join. In this manner, the two inner laminated portions are joined by welding or caulking.

  Similarly, on the negative electrode side, 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, which are the outer negative laminates, The second negative electrode laminate portion 144 and the third negative electrode laminate portion 153, which are different from the fourth negative electrode laminate portion 154, are inner laminate portions, and the joining portions 132 and 133 are the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153. Not joined.

  And the 2nd negative electrode laminated part 144 and the 3rd negative electrode laminated part 153 which are two adjacent inner side laminated parts are bundled and joined. That is, the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 are bundled and fixed by welding or caulking in the region Q3, so that the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 are fixed. Join.

  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, two joint portions 122 and 123 are twisted from opposite side surface portions of the terminal connection portion 121 arranged on the positive electrode terminal 200 side of the positive electrode current collector 120. The positive electrode current collector 120 is formed by bending without bending (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 part arrangement | positioning process, it is the some laminated part which the 1st electrode body 140 and the 2nd electrode body 150 have, Comprising: 2 arrange | positioned at both ends among the several laminated parts arrange | positioned in parallel in the 1st direction Two joining portions 122 and 123 extending in the second direction of the positive electrode current collector 120 are disposed adjacent to each of the outer laminated portions which are the two laminated portions (S104).

  That is, as illustrated in FIGS. 6 to 8, the joint portions 122 and 123 are disposed adjacent to the first positive electrode stack portion 141 and the fourth positive electrode stack portion 152. Similarly, the joining portions 132 and 133 of the negative electrode current collector 130 are also arranged adjacent to the first negative electrode laminate portion 143 and the fourth negative electrode laminate portion 154, respectively.

  Next, as a bonding part bonding step, the two bonding parts 122 and 123 are bundled and bonded to each of the two outer laminated parts (S106).

  That is, as described above, as illustrated in FIGS. 6 to 8, the bonding portions 122 and 123 are bundled and bonded to the first positive electrode stacked portion 141 and the fourth positive electrode stacked portion 152, respectively. Similarly, the joint portions 132 and 133 of the negative electrode current collector 130 are also bundled and joined to the first negative electrode laminate portion 143 and the fourth negative electrode laminate portion 154, respectively.

  Next, as the inner laminated portion joining step, different electrodes among the inner laminated portions that are different from the two outer laminated portions of the plurality of laminated portions included in the first electrode body 140 and the second electrode body 150. The two adjacent inner laminated portions included in the first electrode body 140 and the second electrode body 150 which are the bodies are bundled and joined (S108).

  That is, as described above, as shown in FIGS. 6 to 8, the second positive electrode laminate portion 142 and the third positive electrode laminate portion 151 are bundled and joined. Similarly, the second negative electrode laminate portion 144 and the third negative electrode laminate portion 153 are bundled and joined.

  Note that the order of performing the inner laminated portion joining step is not limited after the joining portion joining step, and before the current collector forming step, between the current collector forming step and the joining portion placing step, the joining portion placing step. The inner laminated portion joining step may be performed in any order, for example, between and the joining portion joining step.

  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 current body 120 and the negative electrode current collector 130 are bundled with each of two laminated portions arranged at both ends among the plural laminated portions of the first electrode body 140 and the second electrode body 150 which are a plurality of electrode bodies. Have two joint portions to be joined together. That is, one joining part is joined to one laminated part of the several laminated parts which the 1st electrode body 140 and the 2nd electrode body 150 have. Here, in the case where the bonding portion is bonded to a plurality of stacked portions included in the electrode body, it is necessary to bundle and bond a very large number of metal foils and the bonded portions, but the bonded portion is bonded to one stacked portion. Therefore, a small number of metal foils (40 or less metal foils in the present embodiment) and the joining portion may be bundled and joined. For this reason, in the electrical storage element 10, the positive electrode current collector 120 and the negative electrode current collector 130 can be easily connected to the first electrode body 140 and the second electrode body 150.

  Further, by reducing the number of metal foils to be joined to the joining portion, the width of the active material layer non-formation portion of the electrode body necessary for joining (for example, the first positive electrode laminate portion 141 and the first negative electrode shown in FIG. 8). The length of the stacked portion 143 in the X-axis direction) 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 first positive electrode lamination part 141 and the first negative electrode lamination part 143 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.

  In addition, the two joint portions 122 and 123 of the positive electrode current collector 120 are disposed so as to hang down from opposite side surface portions of the terminal connection portion 121. That is, since the positive electrode current collector 120 has a simple shape such as a flat plate member bent, the positive electrode current collector 120 can be easily manufactured. The same applies to the negative electrode current collector 130.

  In addition, since the two joint portions 122 and 123 of the positive electrode current collector 120 are formed without being twisted from the terminal connection portion 121, it is necessary to avoid interference between the twisted portion and the electrode body. Absent. That is, when the positive electrode current collector 120 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 positive electrode current collector 120 is manufactured without being twisted, there is no need to form the laminated portion. For this reason, in the electrical storage element 10, the positive electrode current collector 120 can be easily connected to the first electrode body 140 and the second electrode body 150. The same applies to the negative electrode current collector 130.

  Further, since each of the two joint portions 122 and 123 of the positive electrode current collector 120 may be joined to the laminated portions at both ends, welding work can be performed from the outside, and the first electrode body 140 and the first The joining portions 122 and 123 of the positive electrode current collector 120 can be joined to the stacked portion of the two-electrode body 150. The same applies to the negative electrode current collector 130.

  In addition, since the inner laminated portions included in the first electrode body 140 and the second electrode body 150 that are adjacent electrode bodies are bundled and joined, the first electrode body 140 and the second electrode body that are adjacent electrode bodies are connected. A gap between the two electrode bodies 150 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 electricity storage element 10 may be reduced. For this reason, in the electrical storage element 10, since the gap between the first electrode body 140 and the second electrode body 150 which are adjacent electrode bodies is closed, it is possible to suppress the movement of foreign matters such as dust on the metal foil, It is possible to prevent a decrease in capacity. Further, by bundling the inner laminated portions of the first electrode body 140 and the second electrode body 150 which are adjacent electrode bodies, the electric power between the first electrode body 140 and the second electrode body 150 which are the adjacent electrode bodies is bundled. It is also possible to maintain an equilibrium.

  Further, the two inner laminated portions can be easily joined by utilizing welding such as ultrasonic welding and resistance welding or caulking.

  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 easily formed.

  Further, when the power storage element 10 includes the first electrode body 140 and the second electrode body 150 which are two electrode bodies, the two joint portions 122 and 123 are bundled with each of the two outer stacked portions. And the inner laminated parts are also bundled and joined. In this way, the first electrode body 140 and the second electrode body 150 and the positive electrode current collector 120 can be easily joined. The same applies to the negative electrode current collector 130.

  In addition, according to the method for manufacturing power storage device 10 according to the embodiment of the present invention, two stacked layers at both ends among the stacked portions of first electrode body 140 and second electrode body 150 that are a plurality of electrode bodies. Two joint portions 122 and 123 of the positive electrode current collector 120 are disposed adjacent to each of the portions, and the two joint portions 122 and 123 are bundled and joined to each of the two stacked portions. That is, since one joining portion is joined to one laminated portion of the plurality of laminated portions of the first electrode body 140 and the second electrode body 150, a small number of metal foils and joining portions are bundled and joined. do it. For this reason, in the manufacturing method of the electrical storage element 10, the joining parts 122 and 123 of the positive electrode current collector 120 can be easily connected to the laminated part of the first electrode body 140 and the second electrode body 150. The same applies to the negative electrode current collector 130.

  Further, in the method for manufacturing the energy storage device 10, the positive electrode current collector 120 is formed by bending the two joint portions 122 and 123 without twisting from the terminal connection portion 121. That is, since the positive electrode current collector 120 has a simple shape such as a flat plate member bent, the positive electrode current collector 120 can be easily manufactured. Further, since the positive electrode current collector 120 is formed without being twisted, 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, the positive electrode current collector 120 can be easily connected to the first electrode body 140 and the second electrode body 150. The same applies to the negative electrode current collector 130.

  Moreover, in the manufacturing method of the electrical storage element 10, the inner side laminated parts contained in the 1st electrode body 140 and the 2nd electrode body 150 which are adjacent electrode bodies are bundled and joined. For this reason, in the manufacturing method of the electrical storage element 10, since the gap between the first electrode body 140 and the second electrode body 150, which are adjacent electrode bodies, is blocked, foreign matters such as metal foil dust move. It can suppress and can prevent a capacity | capacitance fall. Further, by bundling the inner laminated portions of the first electrode body 140 and the second electrode body 150 which are adjacent electrode bodies, the electric power between the first electrode body 140 and the second electrode body 150 which are the adjacent electrode bodies is bundled. It is also possible to maintain an equilibrium.

(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 joint portion 122a is disposed on the inner side (Y-axis direction plus side) of the first positive electrode laminate portion 141 so as to extend in the second direction along the first positive electrode laminate portion 141. The positive electrode laminate 141 is bundled and joined. That is, the joining portion 122a is bundled with the first positive electrode laminate portion 141 inside the first positive electrode laminate portion 141, and is joined by being fixed by welding or caulking in the region R1a.

  In addition, the joining portion 123 a is disposed on the inner side (Y-axis direction minus side) of the fourth positive electrode stacking portion 152 so as to extend in the second direction along the fourth positive electrode stacking portion 152, and the fourth positive electrode stacking portion 152. It is bundled and joined. That is, the joint portion 123a is bundled with the fourth positive electrode laminate portion 152 inside the fourth positive electrode laminate portion 152, and is joined by being fixed by welding, caulking, or the like within the region R2a.

  The joining portion 132a is disposed on the inner side (Y axis direction plus side) of the first negative electrode laminate portion 143 so as to extend in the second direction along the first negative electrode laminate portion 143, and the first negative electrode laminate portion 143 is disposed. It is bundled and joined. That is, the joining portion 132a is bundled with the first negative electrode laminate portion 143 inside the first negative electrode laminate portion 143, and is joined by being fixed by welding or caulking in the region Q1a.

  In addition, the joint portion 133a is disposed on the inner side (Y-axis direction negative side) of the fourth negative electrode stack portion 154 so as to extend in the second direction along the fourth negative electrode stack portion 154, and the fourth negative electrode stack portion 154. It is bundled and joined. That is, the joint portion 133a is bundled with the fourth negative electrode laminate portion 154 inside the fourth negative electrode laminate portion 154, and is joined by being fixed by welding, caulking, or the like within the region Q2a.

  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.

  As shown in the figure, the power 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. 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). It joins to each of the outer side laminated part which is two laminated parts arrange | positioned at both ends among the several laminated parts arrange | positioned in parallel.

  That is, the joining portion 122b of the positive electrode current collector 120b is bundled with the laminated portion on the outer side (minus side in the Y-axis direction) of the first electrode body 140 as the outer laminated portion, and is fixed by welding or caulking in the region R1b. Has been joined. Further, the joint 123b of the positive electrode current collector 120b is bundled with a laminated portion on the outer side (Y-axis direction plus side) of the third electrode body 160 as an outer laminated portion, and is fixed by welding or caulking in the region R2b. Has been joined. The same applies to the negative electrode current collector 130b.

  In addition, the positive electrode current collector 120b and the negative electrode current collector 130b are stacked portions different from the two outer stacked portions among the multiple stacked portions of the first electrode body 140, the second electrode body 150, and the third electrode body 160. It is joined to the two outer laminated parts at the two joined parts without being joined to the inner laminated part. And two inner laminated parts which are two adjacent inner laminated parts among several laminated parts and are contained in a different electrode body are bundled and joined.

  That is, the Y-axis direction plus-side laminated portion of the first electrode body 140 and the Y-axis direction minus-side laminated portion of the second electrode body 150 are bundled and fixed by welding or caulking in the region R3a. It is joined. Further, the Y-axis direction plus side laminated portion of the second electrode body 150 and the Y-axis direction minus side laminated portion of the third electrode body 160 are bundled and fixed by welding or caulking in the region R3b. It is joined. The same applies to the negative electrode current collector 130b.

  In this modification, the power storage element includes three electrode bodies, but the power storage element may include four or more electrode bodies. Even in this case, the two joining portions of the current collector are bundled and joined to the outer laminated portions of the electrode bodies at both ends, and adjacent laminated portions of different electrode bodies are joined to each other for the inner laminated portions. .

  As described above, the same effects as those of the above-described 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 electrode body. Can do.

  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 may be modified according to the modification 1.

  Moreover, in the said embodiment, although two adjacent inner laminated parts (for example, the 2nd positive electrode laminated part 142 and the 3rd positive electrode laminated part 151) which a different electrode body has were joined, the said two The inner laminated portion may not be joined.

  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 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 Storage element 100 Container 110 Cover body 110a, 110b Through-hole 111 Main body 120, 120a, 120b Positive electrode collector 121 Terminal connection part 121a, 131a Through-hole 122, 122a, 122b, 123, 123a, 123b, 124, 125 Joint part 130, 130a, 130b Negative electrode current collectors 132, 132a, 133, 133a Joint portion 140 First electrode body 141 First positive electrode laminate portion 142 Second positive electrode laminate portion 143 First negative electrode laminate portion 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 200 Positive electrode terminal 210 Protruding portion 300 Negative electrode terminal 310 Protruding portion

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 stacked portions of the plurality of electrode bodies, and is an outer side that is two stacked portions disposed at both ends among the plurality of stacked portions disposed in parallel in the first direction. Having two joints extending in the second direction, which are joined to each of the laminated parts;
The two joint portions are bundled and joined to each of the two outer laminated portions. The current collector further has a terminal connection portion disposed on the electrode terminal side,
The electric storage element according to claim 1, wherein the two joint portions are arranged to hang down in the second direction from opposite side surface portions of the terminal connection portion. The electric storage element according to claim 2, wherein the two joint portions are formed without being twisted from opposite side surface portions of the terminal connection portion. The current collector is not joined to the inner laminated portion, which is a laminated portion different from the two outer laminated portions, of the plurality of laminated portions of the plurality of electrode bodies. The electricity storage device according to claim 1, wherein the electricity storage device is joined to the two outer laminated portions. The electric storage element according to claim 4, wherein two inner laminated portions that are adjacent two of the plurality of laminated portions and are included in different electrode bodies are bundled and joined. The power storage element according to claim 5, wherein the two inner laminated portions 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 said 2 junction part is bundled and joined with each of the said 2 outer side lamination | stacking part among these several lamination | stacking parts comprised by the said 2 lamination | stacking part. The electrical storage element as described in. The power storage element includes a first electrode body and a second electrode body, which are two electrode bodies, as the plurality of electrode bodies,
The first electrode body has, as the plurality of stacked portions, a first stacked portion and a second stacked portion that are two stacked portions arranged in the first direction,
The second electrode body has, as the plurality of stacked portions, a third stacked portion and a fourth stacked portion that are two stacked portions arranged in the first direction,
The two joining portions are bundled and joined with each of the first laminated portion and the fourth laminated portion as the two outer laminated portions,
The power storage element according to claim 1, wherein the second stacked unit and the third stacked unit are bundled and joined. 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:
Each of the plurality of stacked portions of the plurality of electrode bodies, each of the outer stacked portions being two stacked portions disposed at both ends among the plurality of stacked portions disposed in parallel in the first direction, A joint arrangement step of arranging adjacent two joints extending in the second direction of the current collector;
A method for manufacturing an electric storage element, comprising: a joining part joining step in which the two joining parts are bundled and joined to each of the two outer laminated parts. further,
A current collector forming step of forming the current collector by bending the two joint portions without twisting from opposite side surface portions of a terminal connection portion arranged on the electrode terminal side of the current collector. 10. A method for producing an electricity storage device according to 9. further,
Out of the plurality of stacked portions included in the plurality of electrode bodies, the two adjacent inner stacked portions included in different electrode bodies are bundled among the inner stacked portions that are different from the two outer stacked portions. The manufacturing method of the electrical storage element of Claim 9 or 10 including the inner side laminated part joining process of joining.

Images