JP2016126905A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element having an electrode body and a collector bonded by using an auxiliary member, and capable of being manufactured efficiently.SOLUTION: In a power storage element 10 including an electrode body 140 formed by laminating polar plates, and a collector 120 and an auxiliary member 150 bonded to the focusing portion 141 at the end of the electrode body 140 in a first direction crossing the polar plate, the auxiliary member 150 has a first plate part 151 and a second plate part 152, at least one of which is bonded to the focusing portion 141 while sandwiching the focusing portion 141 between the collector 120, and a connection 153 including a plane in parallel with the first direction, and connecting the first plate part 151 and second plate part 152.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage device including an electrode body and a current collector connected to the electrode body.

  Conventionally, a storage element such as a lithium ion secondary battery has, for example, an electrode body in which two types of electrode plates (a positive electrode and a negative electrode) and a separator disposed between the positive electrode and the negative electrode are stacked.

  At each end of the positive electrode and the negative electrode of the electrode body, a converging part is formed by laminating a metal foil part (uncoated part) that is not coated with an active material. A metal member called is connected. An electrode terminal which is a positive electrode terminal or a negative electrode terminal is connected to the current collector, and charging and discharging are performed via the electrode terminal.

  There are various methods such as ultrasonic welding and resistance welding as a method for joining the converging portion of the electrode body and the current collector in the electricity storage device having such a structure.

  Patent Document 1 discloses a secondary battery in which end portions of an electrode body (electrode winding group) are sandwiched between a current collector plate connection piece and a support body, and these are joined by ultrasonic welding. .

  In this secondary battery, the electrode winding group is configured by winding a positive electrode foil and a negative electrode foil in a flat shape around an axial center with a separator interposed therebetween, and is arranged on the inner periphery of the electrode winding group. The support is fixed to the electrode winding group by being fixed to the shaft core.

JP 2011-165437 A

  In the case where the converging part at the end of the electrode body and the current collector are joined by welding or the like, in order to protect the converging part that is a laminated part of the metal foil from vibration or impact at the time of joining, An auxiliary member (auxiliary member) such as a support in the art is used.

  This auxiliary member is preferably stably attached to the electrode body when performing the joining work from the viewpoint of improving work efficiency. In this regard, in the above-described conventional technique, the support is fixed to the electrode body by fixing the support to the shaft core that penetrates the electrode body. However, in this case, it is necessary to perform operations such as inserting and welding the protrusions arranged at the ends of the shaft cores into the plurality of holes provided in the support, and this is necessary in the manufacturing process of the storage element. Incurs complications.

  In view of the above-described conventional problems, the present invention aims to provide an energy storage device in which an electrode body and a current collector are joined using an auxiliary member, and can be efficiently manufactured. To do.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes an electrode body formed by stacking electrode plates, and a first direction of the electrode body that intersects the stacking direction of the electrode plates. A power storage element comprising a current collector and an auxiliary member joined to a converging portion at an end of the at least one of the auxiliary members, wherein at least one of the auxiliary members sandwiches the converging portion between the current collector A first plate portion and a second plate portion that are joined to the converging portion, and a connection portion that includes a surface parallel to the first direction and connects the first plate portion and the second plate portion.

  According to this configuration, for example, at the time of manufacturing the power storage element, for example, the other of the first plate portion and the second plate portion is pressed against the converging portion using one of the first plate portion and the second plate portion. Can create a state. Thereby, an auxiliary member can be stably arrange | positioned with respect to an electrode body.

  As a result, for example, handling of the electrode body with the auxiliary member attached is facilitated. Further, it is possible to improve the accuracy of the position and posture of the auxiliary member with respect to the converging part of the electrode body at the time of joining the current collector and the converging part of the electrode body.

  In addition, the auxiliary member itself can serve as a temporary fixing member for the electrode body of the auxiliary member. For this reason, for example, when the power storage element is manufactured, dropping of the auxiliary member from the electrode body or displacement of the auxiliary member is suppressed, and a jig for temporarily fixing the auxiliary member to the electrode body becomes unnecessary. As a result, for example, the number of parts of the power storage element can be reduced.

  Therefore, the power storage device of this aspect is a power storage device in which the electrode body and the current collector are joined using the auxiliary member, and can be efficiently manufactured.

  In the energy storage device according to one embodiment of the present invention, the connection portion connects one end of the first plate portion and the second plate portion in the second direction intersecting the stacking direction and the first direction. It is good.

  According to this configuration, for example, substantially the entire area of the first plate portion and the second plate portion can be effectively used as a region for joining with the focusing portion of the electrode body.

  In the power storage device of one embodiment of the present invention, the electrode body includes the two focusing portions that are arranged apart from each other in the stacking direction, and the current collector includes the two focusing portions in the stacking direction. The auxiliary member is disposed between the two converging parts, and the outer surface of each of the first plate part and the second plate part is the converging part. It may be joined to the part.

  According to this configuration, the auxiliary member is sandwiched between the two converging portions formed by dividing a collection of uncoated portions of one electrode body in the stacking direction, for example. On the other hand, it is stably arranged. In addition, the two contact plates (first plate portion and second plate portion) that are respectively joined to the converging portion can be handled as one component (auxiliary member), which means improved work efficiency and the number of components. This contributes to the reduction of

  In the power storage element of one embodiment of the present invention, the connection portion may include a bent portion that is a curved or bent portion when viewed from the first direction.

  According to this configuration, for example, the connecting portion is formed so as to protrude in a direction away from a portion (joining portion) to be joined to the stacked portion of each of the first plate portion and the second plate portion. That is, when viewed from the first direction, the auxiliary member is formed in a tapered shape. Thereby, it becomes easy to insert an auxiliary member between two focusing parts, for example. Moreover, the occurrence of a situation in which the auxiliary member damages the converging portion during the insertion is suppressed.

  Further, for example, the connection portion is formed so as to protrude in a direction approaching the joint portion of each of the first plate portion and the second plate portion. Thereby, for example, the total length of the auxiliary member (the length in the direction intersecting the first direction and the stacking direction) can be made relatively short, and as a result, the auxiliary member can be contained in a relatively small space. It becomes.

  In the power storage element of one embodiment of the present invention, the connection portion may include a plurality of the bending portions.

  According to this configuration, the shape of the connection portion can be formed in a corrugated plate shape when viewed from the first direction, for example. Thereby, for example, the elastic modulus (elastic coefficient) of the connecting portion can be improved, and as a result, for example, the temporary fixing of the auxiliary member to the electrode body is more reliably performed.

  In the power storage element of one embodiment of the present invention, the end portion of the auxiliary member on the connection portion side may be formed so that the width in the first direction becomes narrower as it approaches the tip end.

  According to this configuration, when the electrode body is a wound type, the auxiliary member has a tapered shape when the end portion close to the curved portion of the electrode body is viewed from the stacking direction. Thereby, for example, the auxiliary member can be inserted without difficulty in the innermost circumference of the electrode body. In addition, the auxiliary member can be more stably attached to the electrode body.

  Further, in the power storage element according to one aspect of the present invention, the electrode body includes the two focusing portions that are disposed apart from each other in the stacking direction, and the current collector is provided in each of the two focusing portions. Two leg portions arranged so as to come into contact with each other in the stacking direction, and the auxiliary member is arranged so as to sandwich the two converging portions from both sides in the stacking direction, the first plate portion and the The inner surface of each second plate part may be joined to the converging part.

  According to this configuration, the auxiliary member is stable with respect to the electrode body in a state where, for example, two converging parts formed by a collection of uncoated parts of one electrode body being divided in the stacking direction are sandwiched. Arranged. In addition, the two contact plates (first plate portion and second plate portion) that are respectively joined to the converging portion can be handled as one component (auxiliary member), which means improved work efficiency and the number of components. This contributes to the reduction of

  Moreover, the electrical storage element in 1 aspect of this invention WHEREIN: The said connection part may urge at least one of said 1st board part and said 2nd board part in the direction of the said convergence part.

  According to this configuration, for example, the urging force for urging the first plate portion and the second plate portion outward or inward can be adjusted by changing the shape, material, dimension, or the like of the connection portion. Therefore, for example, an auxiliary member that is easy to attach to the electrode body and is difficult to drop off can be produced according to the structure or dimensions of the electrode body.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electrical storage element to which an electrode body and a collector are joined using an auxiliary member, Comprising: The electrical storage element which can be manufactured efficiently can be provided.

3 is a perspective view showing an external appearance of a power storage element in Embodiment 1. FIG. FIG. 3 is a perspective view showing each component included in the power storage element by separating the main body of the container of the power storage element in the first embodiment. FIG. 3 is an exploded perspective view showing each component when the electric storage element in the first embodiment is disassembled. 2 is a perspective view showing a configuration of an electrode body in Embodiment 1. FIG. 3 is a perspective view showing an appearance of an auxiliary member in Embodiment 1. FIG. 2 is a front view of an auxiliary member in Embodiment 1. FIG. 3 is a side view of the auxiliary member in Embodiment 1. FIG. FIG. 10 is a diagram showing an example of a procedure for attaching the auxiliary member to the electrode body in the first embodiment. FIG. 6 is a diagram showing an arrangement mode of auxiliary members in Modification 1 of Embodiment 1. It is a figure which shows the arrangement | positioning aspect of the auxiliary member in the modification 2 of Embodiment 1. FIG. It is a figure which shows the arrangement | positioning aspect of the auxiliary member in the modification 3 of Embodiment 1. FIG. It is a figure which shows the arrangement | positioning aspect of the auxiliary member in the modification 4 of Embodiment 1. FIG. FIG. 10 is a perspective view showing an appearance of an auxiliary member in Modification 5 of Embodiment 1. FIG. 10 is a side view of an auxiliary member in Modification 5 of Embodiment 1. FIG. 10 is a perspective view showing an appearance of an auxiliary member in Modification 6 of Embodiment 1. FIG. 10 is a perspective view showing an appearance of an auxiliary member in Modification 7 of Embodiment 1. FIG. 4 is a first diagram illustrating various shape examples of auxiliary members that can be arranged in the power storage element in the first embodiment. FIG. 6 is a second diagram illustrating various shape examples of auxiliary members that can be arranged in the power storage element in the first embodiment. FIG. 10 is a perspective view showing the appearance of a current collector, an auxiliary member, and a spacer in a second embodiment. FIG. 10 is a diagram showing an arrangement mode of auxiliary members in the second embodiment. FIG. 10 is a perspective view showing an appearance of an auxiliary member in a third embodiment. It is a figure which shows an example of the attachment procedure to the electrode body of the auxiliary member in Embodiment 3. FIG.

  Hereinafter, a battery according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  Each embodiment described below shows one specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, order of production steps, 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 1)
First, an outline of the configuration of power storage element 10 in the first embodiment will be described.

  FIG. 1 is a perspective view showing an appearance of power storage element 10 according to the first embodiment.

  FIG. 2 is a perspective view showing each component included in power storage device 10 by separating main body 111 of container 100 of power storage device 10 in the first exemplary embodiment.

  FIG. 3 is an exploded perspective view showing each component when the electric storage element 10 according to the first embodiment is disassembled. In FIG. 3, the main body 111 of the container 100 is omitted.

  FIG. 4 is a perspective view showing a configuration of electrode assembly 140 in the first exemplary embodiment.

  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. For example, 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 element 10 includes a container 100, a negative electrode terminal 200, and a positive electrode terminal 300. In addition, a negative electrode side current collector 120, a positive electrode side current collector 130, and an electrode body 140 are accommodated inside the container 100.

  Note that a liquid such as an electrolytic solution (nonaqueous electrolyte) is sealed in the container 100 of the power storage element 10, but the liquid is not shown. As the electrolytic solution sealed in the container 100, there is no particular limitation on the type thereof as long as it does not impair the performance of the electricity storage device 10, and various types 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. The container 100 can seal the inside by welding the lid body 110 and the main body 111 after accommodating the electrode body 140 and the like therein. 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.

  As shown in FIG. 4, the electrode body 140 is formed by laminating a positive electrode 146, a separator 148 a, a negative electrode 147, and a separator 148 b in this order and having an elliptical cross section. Is formed. That is, in the present embodiment, the power storage element 10 is provided with a wound electrode body 140 as an electrode body formed by laminating electrode plates (positive electrode 146 and negative electrode 147).

  The positive electrode 146 is obtained by forming a mixture layer containing a positive electrode active material on the surface of an elongated metal foil made of aluminum or an aluminum alloy. The negative electrode 147 is obtained by forming a mixture layer including a negative electrode active material layer on the surface of a long metal foil made of copper or a copper alloy. Separator 148a, 148b is a microporous sheet which consists of resin, for example.

  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 negative electrode active material capable of occluding and releasing lithium ions. Can be used.

  In the electrode body 140 configured as described above, more specifically, the positive electrode 146 and the negative electrode 147 are provided with winding axes (virtual axes parallel to the X-axis direction in the present embodiment) via the separators 148a and 148b. It is wound in a direction shifted from each other.

  And the positive electrode 146 and the negative electrode 147 have the part (uncoated part) in which the active material is not coated in the edge part of each shifted direction, and an uncoated part is laminated | stacked. A converging part is formed.

  Specifically, the negative electrode 147 has converging parts 141 and 142 in which an uncoated part 147a is laminated at one end in the winding axis direction. Further, the positive electrode 146 has converging parts 143 and 144 in which uncoated parts 146a are laminated at the other end in the winding axis direction.

  The winding axis direction is a direction parallel to the first direction intersecting (orthogonal in this embodiment) with each of the stacking directions of the positive electrode 146 and the negative electrode 147 which are electrode plates, and the first direction is the present embodiment. It is parallel to the X-axis direction in the form.

  In addition, each of the focusing unit 141 and the focusing unit 142 is a part of one negative electrode 147, and the focusing unit 141 and the focusing unit 142 can be collectively handled as one focusing unit. Similarly, the converging part 143 and the converging part 144 of the positive electrode 146 can be handled as one converging part.

  However, in the present embodiment, for example, as shown in FIGS. 2 and 3, the converging part at the end of the electrode body 140 on the negative electrode 147 side is the two leg parts (122, 123) of the current collector 120. The two parts (the converging parts 141 and 142) corresponding to the respective parts are handled separately. Further, the converging portion at the end of the electrode body 140 on the positive electrode 146 side is divided into two portions (the converging portions 143 and 144) corresponding to the two legs (132 and 133) of the current collector 130, respectively. Treated.

  A mode in which the converging portions at the ends of the electrode body 140 are collectively bonded to the current collector will be described later with reference to FIG. 9, for example.

  The negative electrode terminal 200 is an electrode terminal electrically connected to the negative electrode 147 of the electrode body 140, and the positive electrode terminal 300 is an electrode terminal electrically connected to the positive electrode 146 of the electrode body 140.

  The negative electrode terminal 200 and the positive electrode terminal 300 are attached to the lid body 110 disposed above the electrode body 140. Specifically, as shown in FIG. 3, in the negative electrode terminal 200, the protruding portion 210 is inserted into the through hole 110 a of the lid 110 and the through hole 121 a formed in the terminal connection portion 121 of the current collector 120. By being caulked, the current collector 120 and the lid 110 are fixed together.

  Similarly, in the positive electrode terminal 300, the protrusion 310 is inserted into the through hole 110b of the lid 110 and the through hole 131a formed in the terminal connection part 131 of the current collector 130, and is caulked. Along with the current collector 130, the lid 110 is fixed.

  In addition, although packing etc. are arrange | positioned between the negative electrode terminal 200 and the positive electrode terminal 300, and the cover body 110, those illustration is abbreviate | omitted.

  The current collector 120 is disposed between the negative electrode 147 of the electrode body 140 and the side wall of the main body 111 of the container 100, and has electrical conductivity and rigidity that are electrically connected to the negative electrode terminal 200 and the negative electrode 147 of the electrode body 140. It is a member provided with. The current collector 120 is made of copper, a copper alloy, or the like, like the negative electrode base foil of the electrode body 140.

  The current collector 130 is disposed between the positive electrode 146 of the electrode body 140 and the side wall of the main body 111 of the container 100, and is electrically and rigidly connected to the positive electrode terminal 300 and the positive electrode 146 of the electrode body 140. It is a member provided with. The current collector 130 is made of aluminum, an aluminum alloy, or the like, like the positive electrode base foil of the electrode body 140.

  The current collector 120 has leg portions 122 and 123 arranged so as to sandwich the converging portions 141 and 142 of the electrode body 140 from both sides. The leg portions 122 and 123 are long portions extending from the end portion of the terminal connection portion 121 included in the current collector 120. The leg part 122 is joined to the converging part 141, and the leg part 123 is joined to the converging part 142. Thereby, the current collector 120 is electrically connected to the negative electrode 147 of the electrode body 140.

  The current collector 130 has leg portions 122 and 123 arranged so as to sandwich the converging portions 143 and 144 of the electrode body 140 from both sides. The leg portions 132 and 133 are long portions extending from the end portion of the terminal connection portion 131 included in the current collector 130. The leg part 132 is joined to the converging part 143, and the leg part 133 is joined to the converging part 144. Thereby, the current collector 130 is electrically connected to the positive electrode 146 of the electrode body 140.

  In the present embodiment, current collectors 120 and 130 are joined to electrode body 140 by ultrasonic welding. An auxiliary member 150 is used for this joining. The auxiliary member 150 is arranged so that the converging portions (141 to 144) are not damaged by vibration or impact when the current collector (120, 130) and the electrode body 140 are joined, or the current collector (120, 130). This is a metal member used as an auxiliary to improve the bonding force between the electrode body 140 and the electrode body 140.

  That is, the auxiliary member 150 has a function as a member generally referred to as a “pad”. The auxiliary member 150 protects the converging portions (141 to 144) of the electrode body 140 and improves the reliability of the joining by welding.

  Hereinafter, the auxiliary member 150 will be described in more detail with reference to FIGS. 5A to 5C and FIG. 6.

  In the present embodiment, the shape and mounting structure of the negative electrode 147 side member (current collector 120 and auxiliary member 150) and the positive electrode 146 side member (current collector 130 and auxiliary member 150) are as follows: Substantially the same. Therefore, in the following, matters relating to members on the negative electrode 147 side will be mainly described, and explanations regarding matters relating to members on the positive electrode 146 side will be omitted as appropriate.

  FIG. 5A is a perspective view showing an appearance of auxiliary member 150 in the first embodiment.

  FIG. 5B is a front view of auxiliary member 150 in the first embodiment, and FIG. 5C is a side view of auxiliary member 150 in the first embodiment.

  The “front view” and “side view” in FIGS. 5B and 5C are based on the posture when the auxiliary member 150 is attached to the electrode body 140. Specifically, the “front view” shows the auxiliary member 150. It is a figure at the time of seeing from the winding-axis direction (1st direction) of the electrode body 140. FIG. The “side view” is a view when the auxiliary member 150 is viewed from the direction in which the converging portions 141 and 142 are aligned (Y-axis direction).

  As shown in FIGS. 5A to 5C, the auxiliary member 150 includes a first plate portion 151, a second plate portion 152, and a surface parallel to the first direction, and the first plate portion 151 and the second plate portion 152. And a connection portion 153 for connecting the two.

  At least one of the first plate portion 151 and the second plate portion 152 is joined to the converging portion at the end portion of the electrode body 140 in the first direction. In the present embodiment, the first plate portion 151 is joined to the converging portion 141 of the electrode body 140, and the second plate portion 152 is joined to the converging portion 142 of the electrode body 140.

  The 1st board part 151 and the 2nd board part 152 are substantially flat form, for example, as FIG. 5C shows, it has the junction part 159 which is a part joined to the electrode body 140. As shown in FIG.

  The auxiliary member 150 having such a configuration is used for joining the electrode body 140 and the current collector 120. Specifically, in a state where the converging portion 141 is sandwiched between the leg portion 122 and the first plate portion 151 of the current collector 120, the joint portion 159 is pressurized and given ultrasonic vibration. . Thereby, the leg part 122 and the first plate part 151 are joined to the converging part 141. Further, the leg portion 123 and the second plate portion 152 are joined to the converging portion 142 by the same method (ultrasonic welding).

  The method of joining the current collector 120 and the auxiliary member 150 to the converging portion 141 is not limited to ultrasonic welding, but may be other types of welding such as resistance welding, or mechanical such as clinch joining. A joining technique may be used.

  In the present embodiment, the connection portion 153 has one end of the first plate portion 151 and the second plate portion 152 in the second direction (in the present embodiment, the Z-axis direction) intersecting the stacking direction and the first direction. Connecting.

  That is, the longitudinal ends of the long first plate portion 151 and the second plate portion 152 are connected by the connection portion 153. Therefore, almost the entire area of the first plate portion 151 and the second plate portion 152 can be effectively used as a region for joining with the converging portions 141 and 142 of the electrode body 140.

  Moreover, the connection part 153 has the bending part 153a which is a curved or bent part when it sees from a 1st direction. In the present embodiment, the connecting portion 153 is one piece that is curved so as to protrude in the direction away from the joint portion 159 of the first plate portion 151 and the second plate portion 152 (in this embodiment, the Z-axis minus side). A bent portion 153a is provided.

  In the present embodiment, the auxiliary member 150 is formed by integrating the first plate portion 151, the second plate portion 152, and the connection portion 153 by bending a long metal plate in at least one place in the longitudinal direction. Is formed. That is, the auxiliary member 150 can be easily manufactured by processing such as bending a single metal plate.

  Further, as the material of the auxiliary member 150 attached to the negative electrode 147 side of the electrode body 140, for example, copper or a copper alloy which is the same material as the negative electrode 147 is employed. In addition, as the material of the auxiliary member 150 attached to the positive electrode 146 side of the electrode body 140, for example, aluminum or aluminum alloy which is the same material as the positive electrode 146 is employed.

  The auxiliary member 150 having the above configuration is stably attached to the electrode body 140 by the elastic force included in the auxiliary member 150. That is, the auxiliary member 150 is temporarily fixed to the electrode body 140 by its own elastic force, and in this state, the joining operation (ultrasonic welding or the like) between the electrode body 140 and the current collector 120 is performed.

  FIG. 6 is a diagram illustrating an example of a procedure for attaching the auxiliary member 150 to the electrode body 140 in the first embodiment.

  In FIG. 6, regarding the electrode body 140, the shape of the end faces of the converging portions 141 and 142 on the near side (X-axis plus side) is shown, and the illustration of the portion on the back side from the end face is omitted. Yes. The same applies to the electrode bodies (140, 240) in FIGS. 7 to 10, FIG. 16B, and FIG.

  When the auxiliary member 150 is attached to the electrode body 140, first, as shown in FIGS. 6A and 6B, the auxiliary member 150 is arranged so that the first plate portion 151 and the second plate portion 152 approach each other. The width in the Y-axis direction is reduced.

  The auxiliary member 150 is a part formed of, for example, a metal plate having a thickness of 1 mm or less. The auxiliary member 150 is elastically deformed when the first plate portion 151 and the second plate portion 152 are pressed inward. The width in the Y-axis direction is reduced.

  In this state, as shown in FIG. 6C, the auxiliary member 150 is inserted between the converging portions 141 and 142 of the electrode body 140 that are arranged apart from each other in the stacking direction.

  Here, the connecting portion 153 of the auxiliary member 150 has a bent portion 153 a that protrudes away from the joint portion 159 of each of the first plate portion 151 and the second plate portion 152. That is, the auxiliary member 150 is formed in a tapered shape when viewed from the first direction (X-axis direction). Therefore, it is easy to insert the auxiliary member 150 between the converging parts 141 and 142. Further, the occurrence of a situation in which the auxiliary member 150 damages the converging portion 141 or 142 during the insertion is suppressed.

  In this way, the auxiliary member 150 disposed between the converging parts 141 and 142 generates a restoring force due to elasticity.

  Specifically, the connecting portion 153 biases at least one of the first plate portion 151 and the second plate portion 152 toward the converging portion. In the present embodiment, each of the first plate portion 151 and the second plate portion 152 is urged toward the outer converging portion by the elastic force (restoring force) of the connection portion 153.

  That is, the first plate portion 151 is pressed against the converging portion 141, and the second plate portion 152 is pressed against the converging portion 142. Thereby, the auxiliary member 150 is stably attached to the electrode body 140. That is, the auxiliary member 150 is temporarily fixed to the electrode body 140 by its own elastic force without using a temporary fixing component or the like, for example, the auxiliary member until the auxiliary member 150 is joined to the electrode body 140. The dropout of 150 is suppressed.

  Further, since the displacement of the auxiliary member 150 with respect to the electrode body 140 is also suppressed, the accuracy of the position and posture of the auxiliary member 150 with respect to the converging portions 141 and 142 of the electrode body 140 can be improved.

  Further, the auxiliary member 150 can be handled as one component having two contact plates (first plate portion 151 and second plate portion 152) corresponding to the two converging portions (141, 142). Therefore, it is possible to obtain effects such as an improvement in the manufacturing efficiency of the power storage element 10, a reduction in the number of parts, or easy parts management.

  It is also possible to adjust the biasing force that biases the first plate portion 151 and the second plate portion 152 outward by changing the shape, material, dimensions, or the like of the connection portion 153. Therefore, for example, the auxiliary member 150 that is easy to attach to the electrode body 140 and hardly falls off can be manufactured according to the structure or dimensions of the electrode body 140.

  The current collector 120 is disposed on the electrode body 140 to which the auxiliary member 150 is temporarily fixed, as shown in FIG. That is, the converging part 141 is sandwiched between the leg part 122 of the current collector 120 and the first plate part 151, and the converging part 142 is sandwiched between the leg part 123 of the current collector 120 and the second plate part 152. It will be in the state.

  The auxiliary member 150 may be attached to the electrode body 140 after the current collector 120 is disposed with respect to the electrode body 140.

  Thereafter, as described above, a joining operation such as ultrasonic welding is performed. As a result, the first plate portion 151 and the leg portion 122 are joined to the converging portion 141, and the second plate portion 152 and the leg portion 123 are joined to the converging portion. 142.

  In this joining operation, pressure and vibration are applied to the converging parts 141 and 142 via the auxiliary member 150, so that the converging parts 141 and 142 are protected from vibration and the like by the auxiliary member 150.

  Further, since the first plate portion 151 is urged in the direction of the converging portion 141 and the second plate portion 152 is urged in the direction of the converging portion 142, it is formed by stacking the uncoated portions 147a. Each of the converging parts 141 and 142 can also play a role of grouping in the stacking direction.

  6C and 6D, the tip of the connection portion 153 is separated from the inner peripheral surface of the electrode body 140. However, for example, the auxiliary member 150 may be positioned in the Z-axis direction by causing the tip of the connection portion 153 to be the inner peripheral surface.

  The electrical storage element 10 manufactured through various processes including the above procedures has the following configuration. That is, the electrode body 140 has two converging portions (141, 142) that are arranged apart from each other in the stacking direction, and the current collector 120 sandwiches the two converging portions (141, 142) from both sides in the stacking direction. Having two legs (122, 123) arranged in this manner.

  The auxiliary member 150 is disposed between the two converging parts (141, 142), and the outer surfaces of the first plate part 151 and the second plate part 152 are joined to the converging part. Specifically, the outer surface of the first plate portion 151 is joined to the converging portion 141, and the outer surface of the second plate portion 152 is joined to the converging portion 142.

  As described above, in the present embodiment, the auxiliary member 150 includes two converging portions (141, 142) formed by dividing a group of uncoated portions 147a of one electrode body 140 in the stacking direction. In a state of being sandwiched between them, the electrode body 140 is stably disposed. That is, stabilization of the position of the auxiliary member 150 at the time of manufacturing the power storage element 10 can be realized with a simple configuration, and thereby the manufacturing efficiency of the power storage element 10 can be improved.

  Here, as shown in FIG. 6A, for example, the auxiliary member 150 of the present embodiment has a first plate portion 151 and a second plate portion 152 in a natural state (a state in which the auxiliary plate 150 is not deformed by an external force). The non-parallel shape is such that the closer to the end opposite to the connection portion 153, the farther the distance is. Further, when the width of the auxiliary member 150 is reduced to such an extent that the auxiliary member 150 can be inserted between the converging portions 141 and 142, the first plate portion 151 and the second plate portion 152 are substantially parallel (including completely parallel, The same).

  That is, the auxiliary member 150 is formed such that the first plate portion 151 or the second plate portion 152 is in close contact with each of the converging portions 141 and 142 arranged substantially in parallel, and the elastic member 150 has its own elasticity. Movement is suppressed by force.

  Therefore, the current collector 120 and the electrode body 140 using the auxiliary member 150 are joined with high accuracy, which contributes to the improvement of the quality of the energy storage device 10.

  Here, the connection portion 153 included in the auxiliary member 150 includes a surface parallel to the first direction (X-axis direction), and connects the first plate portion 151 and the second plate portion 152. In other words, the connection portion 153 connects the first plate portion 151 and the second plate portion 152 in a direction around an axis parallel to the X-axis direction.

  The connecting portion 153 connects the first plate portion 151 and the second plate portion 152 in such a manner, so that, for example, the first plate portion 151 and the second plate portion 152 are orthogonal to the X-axis direction. Compared with the case where the connection is made on the surface to be connected, there is an advantage that the degree of adhesion with the electrode body 140 is easily improved.

  For example, it is assumed that the auxiliary member has a connection portion that connects the long sides of the long first plate portion and the second plate portion, and has a connection portion that is parallel to the YZ plane.

  In this case, deformation of the first plate portion and the second plate portion around the axis parallel to the X-axis direction is restricted by the connecting portion. For this reason, for example, the first plate portion or the second plate portion may not be in close contact with the converging portion.

  In addition, the shape of the connecting portion can be determined in advance so as to improve the adhesion of the first plate portion and the second plate portion to the converging portion. In this case, the auxiliary member is a specific type of electrode body. There is a possibility of losing versatility.

  On the other hand, in the auxiliary member 150 in the present embodiment, the first plate portion 151 and the second plate portion 152 are connected by a connection 153 having a surface parallel to the first direction (X-axis direction), Easy to tilt or deform. Therefore, each of the 1st board part 151 and the 2nd board part 152 can be joined to a convergence part in the state with high contact | adherence degree with a convergence part.

  Also from such a viewpoint, the auxiliary member 150 is a connection portion 153 that connects the first plate portion 151 and the second plate portion 152, and includes a connection portion that includes a surface parallel to the first direction (X-axis direction). It is useful to have 153.

  In the present embodiment, the entire connecting portion 153 is parallel to the X-axis direction, but the entire connecting portion 153 does not have to be parallel to the X-axis direction, and a part of the connecting portion 153 is It may be inclined with respect to the axial direction. For example, the elastic modulus (elastic coefficient) of the connecting portion may be improved by curving a part of the connecting portion 153 around the Y axis.

  Moreover, the electrical storage element 10 can also be equipped with the auxiliary member 150 in the aspect different from the aspect shown by FIGS. Further, the shape of the auxiliary member 150 is not limited to the shape shown in FIGS. 5A to 5C and the like. Therefore, various modifications related to the auxiliary member 150 will be described below with a focus on differences from the first embodiment.

(Modification 1 of Embodiment 1)
FIG. 7 is a diagram illustrating an arrangement mode of the auxiliary member 150 in the first modification of the first embodiment.

  In FIG. 7, the illustration of the container 100 and the like is omitted, and a characteristic configuration in the modified example is mainly illustrated. This also applies to FIGS. 8 to 15 described later.

  In the energy storage device 10 illustrated in FIG. 7, the auxiliary member 150 is attached to the electrode body 140 in a posture in which the connection portion 153 faces the terminal connection portion 121 side of the current collector 120. That is, the auxiliary member 150 (see, for example, FIG. 6D) in the first embodiment is attached to the electrode body 140 in a posture that is upside down.

  Even in this case, the first plate portion 151 is urged in the direction of the converging portion 141 and the second plate portion 152 is urged in the direction of the converging portion 142 by the restoring force of the connecting portion 153. Therefore, for example, stabilization of the position of the auxiliary member 150 at the time of manufacturing the power storage element 10 can be realized with a simple configuration, and thus the power storage element 10 can be efficiently manufactured.

(Modification 2 of Embodiment 1)
FIG. 8 is a diagram illustrating an arrangement mode of the auxiliary member 150 in the second modification of the first embodiment.

  8 includes a current collector 220 having four legs (221 to 224), an electrode body 140 disposed between the legs 221 and 222, and legs 223 and 224. And an electrode body 140 disposed between the electrodes. An auxiliary member 150 is attached to each of the two electrode bodies 140.

  Thus, even if one current collector 220 has a structure that sandwiches the converging portions of each of the plurality of electrode bodies 140, the auxiliary member 150 can be attached to each of the plurality of electrode bodies 140. Further, as described in the first embodiment, each of the plurality of auxiliary members 150 is temporarily fixed to the electrode body 140 to be attached by its own elastic force.

  Therefore, for example, when the power storage element 10 is manufactured, the position of the auxiliary member 150 in each of the plurality of electrode bodies 140 can be stabilized with a simple configuration, thereby efficiently manufacturing the power storage element 10. Can do.

(Modification 3 of Embodiment 1)
FIG. 9 is a diagram illustrating an arrangement mode of the auxiliary members 150 in the third modification of the first embodiment.

  The power storage element 10 shown in FIG. 9 includes a current collector 320 having two legs (321, 322), an electrode body 140 joined to the leg 321 and an electrode body 140 joined to the leg 322. Is provided. The auxiliary member 150 is attached in a state sandwiched between the two electrode bodies 140.

  Here, unlike the electrode body 140 according to Embodiment 1 described above, the electrode body 140 in the present modification is a collection of uncoated portions at the end in one bundle. 145 is formed.

  Further, the leg portions 321 and 322 of the current collector 320 are arranged so as to be sandwiched from both sides in the lamination direction with respect to the two converging parts 145 arranged apart in the lamination direction. As for the auxiliary member 150, the outer surface of each of the first plate portion 151 and the second plate portion 152 is joined to the converging portion 145.

  Thus, the converging part 145 joined to each of the two legs (321, 322) included in one current collector 320 may be provided in the two electrode bodies 140 that are separate from each other.

  Even in this case, for example, as shown in FIG. 9, the auxiliary member 150 can be disposed between the two converging portions 145. In this case, for example, in a state where an insulating spacer (not shown) is sandwiched between the two electrode bodies 140 in the central portion in the winding axis direction, the two electrode bodies 140 are bound by an insulating sheet or the like. To do. Accordingly, the two electrode bodies 140 can be handled as one structure, and the auxiliary member 150 can be disposed so that the auxiliary member 150 is sandwiched between the two converging portions 145.

  Thus, even when the auxiliary member 150 is arranged between the converging portions 145 of the two electrode bodies 140, the auxiliary member 150 has its own elastic force as described in the first embodiment. Is temporarily fixed to the two electrode bodies 140 to be attached.

  Therefore, for example, stabilization of the position of the auxiliary member 150 with respect to the two electrode bodies 140 at the time of manufacturing the power storage element 10 can be realized with a simple configuration, thereby improving the manufacturing efficiency of the power storage element 10. it can.

(Modification 4 of Embodiment 1)
FIG. 10 is a diagram illustrating an arrangement mode of the auxiliary members 150 in the fourth modification of the first embodiment.

  The power storage element 10 illustrated in FIG. 10 includes an electrode body 240, a current collector 120, and an auxiliary member 150. Unlike the electrode body 140 according to the first embodiment, the electrode body 240 according to the present modification has a structure in which two types of flat plate plates (a positive electrode and a negative electrode) are alternately stacked with a separator interposed therebetween. This is a stacked electrode body.

  The electrode body 240 has two converging parts (241, 242) that are arranged apart from each other in the stacking direction. Specifically, the collection of uncoated portions at the end of the electrode body 240 is divided into two in the stacking direction, so that two converging portions (241, 242) are formed.

  The current collector 120 has two legs (151 and 152) arranged so as to sandwich the two converging parts (241 and 242) from both sides in the stacking direction.

  The auxiliary member 150 is disposed between the two converging parts (241, 242), and the outer surfaces of the first plate part 151 and the second plate part 152 are joined to the converging part. Specifically, the outer surface of the first plate portion 151 is joined to the converging portion 241, and the outer surface of the second plate portion 152 is joined to the converging portion 242.

  Thus, even when the current collector 120 is joined to the laminated electrode body 240, the auxiliary member 150 is disposed between the converging portions 241 and 242 in the manner shown in FIG. The converging parts 241 and 242 can be protected from vibration or the like at times.

  Further, as described in the first embodiment, the auxiliary member 150 is temporarily fixed to the electrode body 240 by its own elastic force. Therefore, stabilization of the position of the auxiliary member 150 with respect to the electrode body 240 at the time of manufacturing the electricity storage device 10 can be realized with a simple configuration. Thereby, the electrical storage element 10 can be manufactured efficiently.

  Note that separate electrode bodies 240 may be joined to the leg portions 122 and 123 of the current collector 120, respectively. That is, in FIG. 10, the converging unit 241 and the converging unit 242 may be a converging unit included in two electrode bodies 240 that are separate from each other.

(Modification 5 of Embodiment 1)
FIG. 11A is a perspective view showing an appearance of auxiliary member 150a according to Modification 5 of Embodiment 1. FIG.

  FIG. 11B is a side view of auxiliary member 150a in Modification 5 of Embodiment 1.

  The auxiliary member 150a in the present modification has a first plate portion 151, a second plate portion 152, and a connection portion 153 including a surface parallel to the first direction (X-axis direction). As with the member 150, the electrode body 140 is temporarily fixed by its own elastic force. Therefore, as described above, there is an effect that the power storage element 10 can be efficiently manufactured.

  The auxiliary member 150a in this modification is further characterized in that the end of the auxiliary member 150a on the side of the connecting portion 153 is formed such that the width in the first direction (X-axis direction) becomes narrower as it approaches the tip. Have

  Specifically, as shown in FIGS. 11A and 11B, the connecting portion 153 has a tapered portion 154 whose width in the X-axis direction changes from W1 to W2 (W1> W2).

  That is, the auxiliary member 150a has an end portion close to the bending portion of the electrode body 140 (for example, the portion where the electrode plate is turned on the Z axis plus side and the minus side in FIG. 6C) in the stacking direction ( It is a tapered shape when viewed from the (Y-axis direction). Thereby, the auxiliary member 150a can be more stably attached to the wound electrode body 140.

  In the wound electrode body 140, the distance between the two converging portions (141, 142) facing each other in the stacking direction becomes narrower in the vicinity of the bending portion as it approaches the bending portion. Further, in the present embodiment, the current collector 120 is disposed on the outer peripheral side of the electrode body 140, and each of the two converging portions (141, 142) is gathered together on the current collector 120 side, so that in the stacking direction. The distance between the two converging portions (141, 142) facing each other becomes narrower in the direction of the winding axis as it approaches the active material layer.

  Therefore, when the auxiliary member 150a whose end is tapered as described above is inserted between the two converging portions (141, 142), the inner peripheral surface of the electrode body 140 is connected to the end of the auxiliary member 150a. The action of extruding is suppressed.

  Therefore, the auxiliary member 150a can be easily attached to the wound electrode body 140, and the displacement of the auxiliary member 150a relative to the electrode body 140 is suppressed by its own elastic force. As described above, the auxiliary member 150 a in the present modification can be attached to the electrode body 140 more stably by having a shape suitable for the wound electrode body 140.

(Modification 6 of Embodiment 1)
FIG. 12 is a perspective view showing an appearance of the auxiliary member 150b according to the sixth modification of the first embodiment.

  The auxiliary member 150b in the present modification has a first plate portion 151, a second plate portion 152, and a connection portion 153 including a surface parallel to the first direction (X-axis direction). As with the member 150, the electrode body 140 is temporarily fixed by its own elastic force. Therefore, as described above, there is an effect that the power storage element 10 can be efficiently manufactured.

  The auxiliary member 150b in the present modification is further locked to at least one of the converging portion (141 or 142) and the current collector 120, so that the auxiliary member 150 moves toward the center of the electrode body 140. It has the latching piece part 155 which controls the movement of this. In this modification, as shown in FIG. 12, two locking pieces 155 are provided on each of the first plate portion 151 and the second plate portion 152.

  That is, when the auxiliary member 150b is inserted into the innermost periphery of the electrode body 140, at least one locking piece portion 155 included in the auxiliary member 150b is formed by at least one of the converging portion (141 or 142) and the current collector 120. Abut. Thereby, the inward movement of the electrode body 140 of the auxiliary member 150b is restricted.

  Therefore, for example, when the power storage element 10 is manufactured, the position regulation of the auxiliary member 150b in the winding axis direction is further ensured. Further, the occurrence of damage to the electrode body 140 due to the auxiliary member 150b moving toward the center of the electrode body 140 is suppressed.

  In addition, you may bend | fold so that each of the latching piece part 155 which the auxiliary member 150b has may hold a converging part or a converging part and a leg part. For example, each of the two locking piece portions 155 provided on the first plate portion 151 may be bent so as to hold the converging portion 141 and the leg portion 122 (for example, see FIG. 6D). .

  Thereby, for example, the dropout of the auxiliary member 150b before the auxiliary member 150b is joined to the electrode body 140 is more reliably suppressed. Moreover, the position shift of the auxiliary member 150b at the time of joining work such as ultrasonic welding is more reliably suppressed.

(Modification 7 of Embodiment 1)
FIG. 13 is a perspective view illustrating an appearance of the auxiliary member 150c according to the seventh modification of the first embodiment.

  The auxiliary member 150c in the present modification has a first plate portion 151, a second plate portion 152, and a connection portion 153 including a surface parallel to the first direction (X-axis direction). As with the member 150, the electrode body 140 is temporarily fixed by its own elastic force. Therefore, as described above, there is an effect that the power storage element 10 can be efficiently manufactured.

  The auxiliary member 150c in this modification is further characterized in that the connecting portion 153 has a plurality of bent portions.

  Specifically, the connection portion 153 in the present modification is formed between the two bent portions 153a and the two bent portions 153a that are curved so as to protrude to the opposite side of the joint portion 159 (see FIG. 5C). And one bent portion 153b curved so as to protrude toward the joint portion 159. As a result, the connection portion 153 has a shape called, for example, a W shape when viewed from the X-axis direction.

  Thus, the connection part 153 has a plurality of bent parts (153a, 153b), so that, for example, the elastic modulus (elastic coefficient) of the connection part 153 can be improved. The biasing force that biases the two plate portions 152 outward can be increased. As a result, for example, the temporary fixing of the auxiliary member 150c to the electrode body 140 is more reliably performed.

  Thus, the overall shape when viewed from the first direction (X-axis direction) of the auxiliary member provided in the energy storage device 10 is not limited to the shape shown in FIG. 5B, for example, and various shapes are adopted. be able to. Accordingly, various examples of the shape of the auxiliary member that can be disposed in the power storage element 10 will be described below as other modified examples with reference to FIGS. 14 and 15.

(Other variations of the first embodiment)
FIG. 14 is a first diagram illustrating examples of various shapes of auxiliary members that can be arranged on the electricity storage element 10, and FIG. 15 is a second diagram illustrating examples of various shapes of auxiliary members that can be arranged on the electricity storage element 10. FIG.

  14 and 15, each of the auxiliary members 150d to 150k has a natural state and a shape (width) when attached to the electrode body 140 when viewed from the first direction (X-axis direction). Is shown in the figure.

  Each of the auxiliary members 150d to 150k shown in FIG. 14 and FIG. 15 includes a plane parallel to the first direction (X-axis direction), and connects the first plate portion 151 and the second plate portion 152. A connection portion 153 is provided. Therefore, each of auxiliary members 150d to 150k is temporarily fixed to electrode body 140 by its own elastic force, like auxiliary member 150 in the first embodiment. Thereby, the effect that the electrical storage element 10 can be manufactured efficiently is produced.

  Hereinafter, the features of the auxiliary members 150d to 150k will be described with reference to FIGS. 14 and 15.

  The auxiliary member 150d shown in FIG. 14A is characterized in that the bent portion 153a of the connecting portion 153 has a bent shape. That is, as compared with the curved shape of the bent portion 153a (see, for example, FIG. 5B) in the first embodiment, the bent portion 153a of the auxiliary member 150d has a bent shape that is sharply bent. The curved shape may be expressed as a U-shape, for example, and the bent shape may be expressed as a V-shape, for example.

  Thus, when the bending part 153a which the connection part 153 has is a bending shape, when the front-end | tip of the bending part 153a contacts the internal peripheral surface of the electrode body 140, the contact of the said front-end | tip and the said internal peripheral surface The area becomes relatively small.

  That is, for example, when positioning the auxiliary member 150d in the Z-axis direction by bringing the tip of the bent portion 153a into contact with the inner peripheral surface of the electrode body 140, the bent portion 153a and the inner peripheral surface of the electrode body 140 are The possibility of damage to the electrode body 140 due to interference can be reduced.

  The auxiliary member 150e shown in FIG. 14B is characterized in that the connecting portion 153 has a flat plate shape. That is, the connection part 153 does not need to be curved or bent, and may have a flat plate shape as a whole.

  In this case, for example, the overall length in the Z-axis direction of the auxiliary member 150e can be suppressed by not projecting the connecting portion 153 to the opposite side of the joint portion 159 (see FIG. 5C). Further, since the connecting portion 153 is not protruded toward the joint portion 159, the joining operation of the first plate portion 151 and the second plate portion 152 and the electrode body 140 is facilitated.

  The auxiliary member 150f shown in FIG. 14C is characterized in that the connecting portion 153 connects positions in the longitudinal direction of the first plate portion 151 and the second plate portion 152, respectively. Thereby, for example, the point of action of the restoring force of the connection portion 153 can be positioned in the middle of the first plate portion 151 and the second plate portion 152 in the longitudinal direction while suppressing the overall length of the auxiliary member 150f in the Z-axis direction. . Thereby, for example, each of the 1st board part 151 and the 2nd board part 152 can be urged | biased outside with sufficient balance about the longitudinal direction.

  Thus, the connection part 153 does not need to connect one end of each of the first plate part 151 and the second plate part 152 in the second direction (Z-axis direction).

  The auxiliary member 150f having such a shape connects the first plate portion 151 and the second plate portion 152 with a plate material (connecting portion 153) separate from the first plate portion 151 and the second plate portion 152. It is produced by. That is, the 1st board part 151, the 2nd board part 152, and the connection part 153 do not need to be formed integrally.

  Various methods such as welding, adhesion, or pressure bonding (caulking) can be adopted as a method for connecting the first plate portion 151 and the second plate portion 152 to the connection portion 153.

  When the connection part 153 is a separate body from the first plate part 151 and the second plate part 152, for example, a non-metallic member such as resin or carbon fiber can be used as the connection part 153.

  Note that the connecting portion 153 of the auxiliary member 150f has a bent portion 153a that protrudes to the Z-axis minus side. However, when the connecting portion 153 connects positions in the longitudinal direction of the first plate portion 151 and the second plate portion 152, as in the auxiliary member 150g shown in FIG. 153 may have a bent portion 153b protruding to the Z plus side.

  The auxiliary member 150h shown in FIG. 15A is characterized in that both ends in the Z-axis direction of the first plate portion 151 and the second plate portion 152 are connected by the connection portion 153.

  That is, the auxiliary member 150h may be an annular member. Thereby, since the 1st board part 151 and the 2nd board part 152 are urged | biased outside by the two connection parts 153, the urging | biasing force to the outer side of the 1st board part 151 and the 2nd board part 152 is given, for example. Can be increased.

  The auxiliary member 150h having such a shape is prepared by, for example, adjusting the shape of a long metal plate into an annular shape and joining both ends in the longitudinal direction by a technique such as welding, bonding, or crimping (caulking). be able to.

  Further, like the auxiliary member 150i shown in FIG. 15B, each of the two connecting portions 153 may have a plurality of bent portions.

  In the auxiliary member 150i shown in FIG. 15B, each of the two connecting portions 153 has two bent portions 153a and one bent portion 153b formed between the two bent portions 153a. More specifically, the bent portion 153a is formed so as to protrude on the side (outside) opposite to the joint portion 159 (see FIG. 5C), and the bent portion 153b protrudes on the side (inside) of the joint portion 159. It is formed as follows.

  Thus, each of the plurality of connecting portions 153 included in the auxiliary member 150i has a plurality of bent portions, so that, for example, the urging force to the outside of the first plate portion 151 and the second plate portion 152 is further increased. be able to.

  An auxiliary member 150j shown in FIG. 15C has a connecting portion 153 that connects substantially the center portions of the first plate portion 151 and the second plate portion 152 in the longitudinal direction (Z-axis direction). That is, the auxiliary member 150j has an H shape as a whole.

  In this case, the auxiliary member 150j and the electrode body 140 can be joined by welding or the like by setting the region excluding the central portion in the Z-axis direction of the first plate portion 151 and the second plate portion 152 as the joint portion 159. it can.

  For example, in FIG. 15C, a portion above the connection portion 153 and a portion below the connection portion 153 of the first plate portion 151 are joined to the electrode body 140, and above the connection portion 153 of the second plate portion 152. These portions and a portion below the connection portion 153 may be joined to the electrode body 140.

  The auxiliary member 150j is similar to the auxiliary members 150f and 150g described above, and the first plate portion 151 and the second plate portion 152 are separated from the first plate portion 151 and the second plate portion 152 (connection portion). 153). Therefore, for example, a non-metallic member such as resin or carbon fiber can be used as the connection portion 153.

  The auxiliary member 150k shown in FIG. 15 (d) has a connecting portion 153 that connects the end on the Z-axis plus side of the first plate portion 151 and the end on the Z-axis minus side of the second plate portion 152. doing. That is, the auxiliary member 150k has an N-type shape as a whole.

  In this case, it is possible to join the joining part 159 (refer FIG. 5C) of each of the 1st board part 151 and the 2nd board part 152, and the electrode body 140 by welding etc., avoiding the connection part 153.

  As described above, the features of the auxiliary members 150a to 150k having various shapes have been described with reference to FIGS. 11A to 15. However, these features can be combined. For example, the connecting portion 153 of the auxiliary member 150d illustrated in FIG. 14A may include a plurality of bent portions 153a. Further, for example, the H-type auxiliary member 150j as a whole shown in FIG. 15C may have a corrugated connection portion 153 having a plurality of bent portions.

  In addition, each of auxiliary members 150a to 150k may be provided in power storage element 10 in Modifications 1 to 4 of Embodiment 1 shown in FIGS. 7 to 10.

(Embodiment 2)
In the first embodiment, both the first plate portion 151 and the second plate portion 152 included in the auxiliary member 150 are joined to the electrode body 140. However, only one of the first plate portion 151 and the second plate portion 152 included in the auxiliary member 150 may be connected to the electrode body 140.

  Therefore, as the second embodiment, the power storage device 11 including the auxiliary member 150 in which only one of the first plate portion 151 and the second plate portion 152 is connected to the electrode body 140 is the same as the power storage device 10 in the first embodiment. The difference will be mainly described.

  FIG. 16A is a perspective view showing the appearance of current collector 420, auxiliary member 150, and spacer 450 in the second embodiment.

  FIG. 16B is a diagram showing an arrangement mode of the auxiliary members 150 in the second embodiment. In FIG. 16B, illustration of the container 100 and the like is omitted, and the characteristic configuration in the embodiment is mainly illustrated. This is the same for FIG. 18B in the third embodiment described later.

  As shown in FIGS. 16A and 16B, power storage element 11 in the second exemplary embodiment includes electrode body 140, current collector 420, and auxiliary member 150.

  The current collector 420 and the auxiliary member 150 are joined to the converging portion 145 at the end of the electrode body 140 in the first direction (X-axis direction).

  Specifically, the current collector 420 has only one leg 422 connected to the electrode body 140. Further, the electrode body 140 is gathered into a bundle of uncoated portions at the end, as in the case of the electrode body 140 in the third modification of the first embodiment, thereby forming one converging portion 145. ing.

  In such a configuration, with the converging portion 145 sandwiched between the second plate portion 152 of the auxiliary member 150 and the leg portion 422 of the current collector 420, the second plate portion 152 and the leg portion 422 are, for example, It joins with the condensing part 145 by ultrasonic welding.

  Prior to this joining operation, the auxiliary member 150 is disposed between the converging portion 145 and the spacer 450.

  Specifically, the first plate portion 151 abuts on the spacer 450 at least partially disposed on the opposite side of the converging portion 145 across the first plate portion 151, and the second plate portion 152 includes the converging portion. 145 abuts.

  In this embodiment, the spacer 450 is a member formed of an insulating resin, and is attached to the current collector 420 and the electrode body 140 in the manner shown in FIG. 16B.

  For example, the spacer 450 is interposed between the current collector 420 and the converging unit 145 and the container 100 (not shown) of the power storage device 11 to restrict the positions of the current collector 420 and the converging unit 145. Have

  As described above, the auxiliary member 150 arranged between the converging portion 145 and the spacer 450 is temporarily fixed to the electrode body 140 to be attached by its own elastic force as described in the first embodiment. .

  Specifically, each of the first plate portion 151 and the second plate portion 152 is urged outward. Thereby, one of the first plate portion 151 and the second plate portion 152 (the second plate portion 152 in the present embodiment) is pressed against the converging portion 145. In this state, a joining operation (for example, ultrasonic welding) between the electrode body 140 and the current collector 420 is performed.

  As described above, the power storage element 11 according to the second embodiment can realize the stabilization of the position of the auxiliary member 150 at the time of manufacture with a simple configuration, and can thereby manufacture the power storage element 11 efficiently. .

  In addition, the shape of the spacer 450 is not limited to the shape shown by FIG. 16A and FIG. 16B, For example, an annular member may be sufficient when it sees from a 1st direction (X-axis direction).

  Further, the member of the auxiliary member 150 that is not joined to the converging portion 145 of the first plate portion 151 and the second plate portion 152 (the first plate portion 151 in the present embodiment) is in contact with the spacer. The function (such as the position restriction of the current collector 420) may not be provided.

  In addition, power storage element 11 may include any of auxiliary members 150a to 150k in the respective modifications of the first embodiment, instead of auxiliary member 150.

  Further, the power storage element 11 may include a stacked electrode body 240 (see FIG. 10) instead of the wound electrode body 140.

(Embodiment 3)
In the first and second embodiments, the first plate portion 151 and the second plate portion 152 included in the auxiliary member 150 are biased outward, so that at least the first plate portion 151 and the second plate portion 152 are at least. One side was pressed against the converging part.

  However, since each of the first plate portion 151 and the second plate portion 152 included in the auxiliary member 150 is biased inward, at least one of the first plate portion 151 and the second plate portion 152 is pressed against the converging portion. May be.

  Then, as Embodiment 3, about the electrical storage element 12 provided with the auxiliary member 250 by which each of the 1st board part 251 and the 2nd board part 252 is urged | biased inside, the difference with the electrical storage element 10 in the said Embodiment 1 The explanation will be focused on.

  FIG. 17 is a perspective view showing the appearance of the auxiliary member 250 in the third embodiment.

  FIG. 18 is a diagram illustrating an example of a procedure for attaching the auxiliary member 250 to the electrode body 240 in the third embodiment.

  As shown in FIGS. 17 and 18, power storage element 12 in the third embodiment includes electrode body 240, current collector 120, and auxiliary member 250.

  The auxiliary member 250 includes a first plate portion 251, a second plate portion 252, and a surface parallel to the first direction (X-axis direction), and connects the first plate portion 251 and the second plate portion 252. Part 253. The connecting portion 253 biases at least one of the first plate portion 251 and the second plate portion 252 toward the converging portion. In the present embodiment, the connecting portion 253 biases the first plate portion 251 toward the converging portion 241 and biases the second plate portion 252 toward the converging portion 242.

  The electrode body 240 has two converging parts (241, 242) that are arranged apart from each other in the stacking direction. The current collector 120 has two leg portions (122, 123) disposed so as to come into contact with each of the two converging portions (241, 242) from the inside in the stacking direction.

  The auxiliary member 250 is disposed so as to sandwich the two converging parts (241, 242) from both sides in the stacking direction, and the inner side surfaces of the first plate part 251 and the second plate part 252 are joined to the converging part.

  Specifically, the inner side surface of the first plate portion 251 is joined to the converging portion 241, and the inner side surface of the second plate portion 252 is joined to the converging portion 242.

  As shown in FIG. 17A and FIG. 18A, the auxiliary member 250 of the present embodiment is such that the first plate portion 251 and the second plate portion 252 are at the end opposite to the connection portion 253 in the natural state. It is a non-parallel state in which the distance between each other becomes narrower as it approaches the part.

  When the auxiliary member 250 having such a shape is attached to the electrode body 240, the auxiliary member 250 includes the first plate portion 251, the second plate portion 252, as shown in FIGS. 18A and 18B. So that the first plate portion 251 and the second plate portion 252 are opened outward.

  The auxiliary member 250 is a part formed of a metal plate having a thickness of 1 mm or less, for example, like the auxiliary member 150 and the like, and a force is applied so that the distance between the free ends of the first plate portion 251 and the second plate portion 252 is increased. It is elastically deformed by adding.

  As described above, when the first plate portion 251 and the second plate portion 252 are opened to such an extent that the converging portions 241 and 242 can be inserted due to the elastic deformation of the auxiliary member 250, the first plate portion 251 and the second plate portion 251 are opened. The plate portion 252 is substantially parallel.

  That is, the auxiliary member 250 is arranged so that the first plate portion 251 or the second plate portion 252 is in close contact with each of the converging portions 241 and 242 arranged substantially in parallel as shown in FIG. It is formed and its movement is suppressed by its own elastic force.

  As described above, the auxiliary member 250 in the present embodiment is temporarily fixed to the electrode body 240 to be attached by its own elastic force, like the auxiliary member 150 according to the first embodiment.

  Therefore, for example, stabilization of the position of the auxiliary member 250 with respect to the electrode body 240 at the time of manufacturing the power storage element 12 can be realized with a simple configuration, whereby the power storage element 12 can be manufactured efficiently.

  Further, the first plate portion 251 is urged so as to be in close contact with the converging portion 241, and the second plate portion 252 is urged so as to be in close contact with the converging portion 242. Then, the current collector 120 and the electrode body 240 are joined with high accuracy using the auxiliary member 250. This contributes to improving the quality of the electricity storage element 12.

  Note that separate electrode bodies 240 may be joined to the leg portions 122 and 123 of the current collector 120, respectively. That is, in FIG. 18B, the converging unit 241 and the converging unit 242 may be converging units included in the electrode bodies 240 that are separate from each other.

  Further, the connecting portion 253 of the auxiliary member 250 may have one or more bent portions that are curved or bent when viewed from the first direction (X-axis direction).

  Further, the auxiliary member 250 may be attached to the wound electrode body 140. In this case, the leg portions 122 and 123 of the current collector 120 only need to be formed in a shape that can be joined to the inner surfaces (surfaces on the winding shaft side) of the converging portions 141 and 142.

  Although the power storage element in the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, 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.

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

10, 11, 12 Power storage element 100 Container 110 Lid 110a, 110b, 121a, 131a Through hole 111 Main body 120, 130, 220, 320, 420 Current collector 121, 131 Terminal connection 122, 123, 132, 133, 221 , 222, 223, 224, 321, 322, 422 Legs 140, 240 Electrode body 141, 142, 143, 144, 145, 241, 242 Focusing part 146 Positive electrode 146a, 147a Uncoated part 147 Negative electrode 148a, 148b Separator 150 , 150a, 150b, 150c, 150d, 150e, 150f, 150g, 150h, 150i, 150j, 150k, 250 Auxiliary members 151, 251 First plate portion 152, 252 Second plate portion 153, 253 Connection portion 153a, 153b Bending portion 154 Part 155 engaging piece portion 159 junction 200 negative terminal 210, 310 protrusions 300 positive terminal 450 spacer

Claims (8)

An electrode body formed by laminating electrode plates, and a current collector and an auxiliary member joined to a converging portion at an end of the electrode body in a first direction intersecting with the laminating direction of the electrode plates. A storage element comprising:
At least one of the auxiliary members has a first plate portion and a second plate portion joined to the converging portion in a state where the converging portion is sandwiched between the auxiliary member and the auxiliary member, and parallel to the first direction. A power storage device comprising a connecting portion connecting the first plate portion and the second plate portion. The power storage device according to claim 1, wherein the connection portion connects one end of each of the first plate portion and the second plate portion in the second direction intersecting the stacking direction and the first direction. The electrode body has two converging portions arranged apart from each other in the stacking direction,
The current collector has two leg portions arranged so as to sandwich the two converging portions from both sides in the stacking direction,
The power storage device according to claim 1 or 2, wherein the auxiliary member is disposed between the two converging parts, and outer surfaces of the first plate part and the second plate part are joined to the converging part. The power storage element according to any one of claims 1 to 3, wherein the connection portion includes a bent portion that is a curved or bent portion when viewed from the first direction. The power storage element according to claim 4, wherein the connection portion includes a plurality of the bent portions. The storage element according to any one of claims 1 to 5, wherein an end of the auxiliary member on the connection portion side is formed such that the width in the first direction becomes narrower as it approaches the tip. The electrode body has two converging portions arranged apart from each other in the stacking direction,
The current collector has two leg portions arranged to contact each of the two converging portions from the inside in the stacking direction,
The auxiliary member is disposed so as to sandwich the two converging parts from both sides in the stacking direction, and inner surfaces of the first plate part and the second plate part are joined to the converging part. 2. The electricity storage device according to 2. The power storage element according to claim 1, wherein the connection portion biases at least one of the first plate portion and the second plate portion toward the converging portion.

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