JP2018056482A - Power storage device, manufacturing method of power storage device, collector plate, and manufacturing method of collector plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of connection of a collector plate and an external terminal while improving formation precisely of the collector plate.SOLUTION: A power storage device comprises: a power storage element ( capacitor element 4); an electrode lead-out terminal (an anode part 6) on an anode side formed on an end surface of the power storage element and a cathode terminal (a cathode part 8) on a cathode side; collector plates (12 and 16) in which a notch surface (a notch part 48) existed in at least one part of a connection part that is provided to each of the electrode lead-out terminal, and is connected to the electrode lead-out part is projected from a connection part (41); and external terminals (an anode terminal 10 and a cathode terminal 14) in which a terminal component (the anode terminal 10 and the cathode terminal 14) is connected to an upper surface of a projection part (a surface part 40) in which the notch surface is projected is connected, and to which a terminal component and the projection part of the collector plate are welded and connected.SELECTED DRAWING: Figure 2

Description

The present invention relates to a technology for forming a current collector plate that connects between a lead-out terminal and an external terminal of a power storage element.

  In the electric double layer capacitor and the electrolytic capacitor, it is necessary to electrically connect the electrode portion of the energy storage device and the external terminal. The connection state between the electrode part and the external terminal affects the internal resistance of the storage element and the contact resistance of the connection part.

  With regard to such electrical connection, there is a method in which a current collector terminal is provided on the end face of the element to be connected to the current collector plate, and that this current collector plate is used for connection between the outer case and the element or for connection to an external terminal. There is (for example, Patent Document 1).

JP 2007-335156 A

  By the way, in a capacitor as an electricity storage device, press working is used for processing and manufacturing a current collector plate. This press working can facilitate the forming process and simplify the manufacturing process, but it is difficult to perform a complicated shape in a single forming process, and it holds the pressing side and the workpiece to be processed. In some cases, no uniform force is applied between the molds to be molded. In this case, when forming a portion having a large amount of deformation, for example, a bent portion, the metal flows in a curved surface direction or a state close thereto, and the orthogonal corner portion may not be formed. Further, the metal may not flow in due to the influence of air remaining in the mold and the corner may not be formed.

  The capacitor is fixed by welding with a current collector plate interposed between the lead-out terminal and the external terminal of the power storage element. For the current collector plate and the external terminal, for example, a technique of welding and connecting adjacent side surfaces is used. At this time, when the current collector plate is not formed with a corner at a portion that contacts the external terminal, a space (void) is generated inside the weld even if the corner and the side surface of the external terminal are welded. There may be. The generation of such voids causes a problem that reliability of the electric storage device is reduced, such as an increase in internal resistance of the capacitor, a decrease in electric power supplied through the external terminal, and a decrease in welding strength. After the welding process is performed, it is difficult to determine whether or not voids are generated in the connection portion. Therefore, it is desirable to improve the manufacturing accuracy in the manufacturing process of the current collector plate.

  There is no disclosure or suggestion of such a problem, and the configuration disclosed in Patent Document 1 cannot solve such a problem.

  Then, the objective of the electrical storage device of this invention, the manufacturing method of an electrical storage device, a collector plate, and the manufacturing method of a collector plate is in view of the said subject, and aims at improving the shaping | molding precision of a collector plate.

Another object of the present invention is to improve the reliability of the connection between the current collector plate and the external terminal, the power storage device, the method for manufacturing the power storage device, the current collector plate, and the method for manufacturing the current collector plate.

  In order to achieve the above object, an electricity storage device of the present invention is installed in an electricity storage element, an anode-side electrode lead-out terminal and a cathode-side electrode lead-out terminal formed on an end face of the power-storage element, and each of the electrode lead-out terminals. The notch surface in at least a part of the connecting portion connected to the electrode lead terminal is connected to the current collector plate protruding from the connecting portion and the upper surface of the protruding portion from which the notched surface protrudes. The terminal component and the protruding portion of the current collector plate are provided with an external terminal connected by welding.

  In the above electricity storage device, preferably, the current collector plate may have the cut-out surface at least at an upper end surface portion where the terminal component is installed.

  In the above electricity storage device, preferably, the projecting portion may include a placement surface having an angle parallel or nearly parallel to the contact surface of the terminal component on the upper surface side.

  In order to achieve the above object, a method of manufacturing an electricity storage device according to the present invention includes a step of forming an anode-side electrode lead-out terminal and a cathode-side electrode lead-out terminal on an end face of a power storage element, and a connecting portion connected to the electrode lead-out terminal Forming a current collector plate by projecting at least a part of the notched surface, a step of installing the current collector plate on each electrode lead terminal, and a projecting portion from which the notch surface projects And connecting the terminal parts of the external terminals to the cut-out surface of the current collector plate by welding.

  In the method for manufacturing the electricity storage device, preferably, a step of penetrating a part of the plane of the connection portion or cutting a part of the plane to a predetermined depth to form the notch surface; Pressing a part of the connection part along the notch surface in a crossing direction with respect to the plane, or bending a part of the connection part at a predetermined angle along the notch surface.

  Preferably, in the method for manufacturing the electricity storage device, a step of pressing a part of a plane of the connection part while cutting out in a crossing direction with respect to the plane of the connection part and projecting the cutout surface of the cutout part. May be included.

  Preferably, the method for manufacturing an electricity storage device may further include a step of narrowing a gap generated in the connection portion by a step of forming a protruding portion with the notched surface protruding.

  In order to achieve the above object, one aspect of the current collector plate of the present invention is a current collector plate connected to an external terminal of an electricity storage device, and an anode-side electrode lead terminal formed on an end surface of the electricity storage element; A notch surface at a part of the connecting portion connected to the electrode lead-out terminal protrudes from the electrode lead-out terminal on the cathode side.

In order to achieve the above object, one aspect of a method of manufacturing a current collector plate according to the present invention is a method of manufacturing a current collector plate connected to an external terminal of a power storage device, the anode formed on an end surface of a power storage element A step of projecting a notch surface, which is provided on each of the electrode lead terminal on the side and the electrode lead terminal on the cathode side, and cuts out a part of the connecting portion to be connected to the electrode lead terminal. The terminal component of the external terminal is connected to the upper surface of the protruding protrusion, and the terminal component and the protruding portion of the current collector plate are welded.

  According to the present invention, any of the following effects can be obtained.

  (1) It is possible to improve the connection strength and reduce the internal resistance at the connection portion between the current collector plate and the terminal component without generating a gap in the welded portion between the current collector plate and the terminal component.

  (2) By improving the forming accuracy of the exposed portion of the current collector plate to be connected to the terminal component, the accuracy of welding connection between the current collector plate and the terminal component is increased, and the reliability of the manufacturing process of the electricity storage device is improved.

  (3) By simplifying the shape of the current collector plate by cutting out a part of the current collector plate and stabilizing the molded shape of at least the portion to be welded to the terminal component, the current collector plate can be simplified.

Other objects, features, and advantages of the present invention will become clearer with reference to the accompanying drawings and each embodiment.

It is a figure which shows the structural example of the electrical storage device which concerns on 1st Embodiment. It is a disassembled perspective view of a capacitor element, a current collecting plate, and a sealing body. It is a figure which shows the example of an external appearance structure of a current collecting plate. It is a figure which shows the example of installation of the current collection board with respect to a capacitor | condenser element. It is a figure which shows the process example of the welding connection of a current collecting plate and an external terminal. It is a figure which shows an example of the formation process of a current collecting plate. It is a flowchart which shows the manufacturing process example of a capacitor | condenser. It is a figure which shows the structural example of the current collection board used for the electrical storage device which concerns on 2nd Embodiment. It is a figure which shows the structural example of the current collection board used for the electrical storage device which concerns on 3rd Embodiment.

  [First Embodiment]

  FIG. 1 shows an example of an electricity storage device according to the first embodiment. The configuration shown in FIG. 1 shows an electric double layer capacitor as an example of an electricity storage device, and may be another electricity storage device such as an electrolytic capacitor, a lithium ion battery, or a lithium ion capacitor.

  The capacitor 2 is an example of an electricity storage device of the present disclosure. For example, as illustrated in FIG. 1, a plurality of anode-side extractions as anode portions 6 are provided on the same element end face side of a capacitor element 4 that is an example of an electricity storage element. The terminals are drawn out, and a plurality of cathode-side lead terminals are drawn out as the cathode portion 8. The anode part 6 and the cathode part 8 are respectively arranged on the left and right with the central part of the capacitor element 4 as a boundary, for example. The capacitor 2 may be, for example, an electric double layer capacitor, an electrolytic capacitor, or a hybrid capacitor.

  In the capacitor 2, an anode terminal 10 is connected to the anode portion 6 via an anode current collector plate 12, and a cathode terminal 14 is connected to the cathode portion 8 via a cathode current collector plate 16. The anode terminal 10 and the cathode terminal 14 are examples of external terminals of the present disclosure, and the anode terminal 10, the anode current collector plate 12, and the anode portion 6 are electrically connected to each other, and the cathode terminal 14 and the cathode current collector plate 16 are respectively connected. And the cathode portion 8 are electrically connected. One side of the anode current collector plate 12 or the cathode current collector plate 16 is connected to the anode portion 6 or the cathode portion 8. A part of the anode current collector plate 12 and the cathode current collector plate 16 are exposed to the external terminal side, and the exposed portions are in contact with the anode terminal 10 or the cathode terminal 14 respectively. The anode terminal 10 and the cathode terminal 14 are terminal components that feed power stored in the capacitor 2 by connecting one end side to a substrate (not shown) or an external device. The anode terminal 10 and the anode current collector plate 12, and the cathode terminal 14 and the cathode current collector plate 16 are integrated by welding connection.

  The capacitor 2 includes an exterior case 20 and a sealing body 22 as exterior members of the capacitor element 4. The outer case 20 is formed in a bottomed cylindrical shape, for example, and is made of a metal material. The sealing body 22 is an example of a unit that closes the opening of the outer case 20 and maintains the airtightness of the space 24. Further, the sealing body 22 is an example of a supporting unit that maintains the capacitor element 4 at a predetermined position in the outer case 20 by fixing and supporting the anode terminal 10 and the cathode terminal 14.

  For example, as shown in FIG. 2, the sealing body 22 includes a base member 26 that constitutes the whole, and a sealing portion 28 that seals between the peripheral portion and the exterior case 20. The base member 26 is made of, for example, insulative synthetic resin, and is formed in accordance with the opening shape of the exterior case 20 and penetrates the anode terminal 10 and the cathode terminal 14 at a predetermined interval. In addition, the sealing portion 28 is made of a resin material such as rubber having a high sealing property, and is formed so as to surround the outer peripheral side of the base member 26 in accordance with the opening shape of the outer case 20.

  As described above, the outer case 20 supports the terminal component and the capacitor element 4 through the sealing body 22, so that, for example, even when vibration or impact is applied to the use environment of the capacitor 2, the external terminal and each current collector are collected. This prevents excessive stress from being applied to the welded connection with the plate.

  <Configuration of Capacitor Element 4 and Current Collector Plate>

  The capacitor element 4 is formed by, for example, laminating an anode body 30 and a cathode body 32 via a separator 34 and winding the laminated body into a cylindrical shape. As the anode body 30 and the cathode body 32, for example, an aluminum foil is used as a collecting electrode, and an activated carbon layer is formed on both surfaces of the aluminum foil to form a polarizable electrode body. The separator 34 is, for example, electrolytic paper. In the capacitor element 4, an insulating interval is provided between the anode portion 6 and the cathode portion 8 that protrude from the same end face so that neither the anode body 30 nor the cathode body 32 is exposed.

  The anode current collecting plate 12 and the cathode current collecting plate 16 are formed to be equivalent to the shapes of the anode portion 6 and the cathode portion 8, respectively, and are formed to be equal to or smaller than the widths of the anode portion 6 and the cathode portion 8. . Thus, in the case of the cylindrical capacitor element 4, the anode portion 6, the cathode portion 8, the anode current collector plate 12, and the cathode current collector plate 16 are formed, for example, in a semicircular shape or a fan shape with the center line interposed therebetween. . The anode portion 6 and the anode current collector plate 12 or the cathode portion 8 and the cathode current collector plate 16 are welded and connected as described later, for example.

  The anode current collecting plate 12 and the cathode current collecting plate 16 are formed with an exposed portion 40 that exposes a part of the flat plate portion in a direction away from the capacitor element 4 side. The exposed portion 40 is a connection portion that is connected to an external terminal, and is an example of a protruding portion of the present disclosure.

  <About the structure of the current collector plates 12 and 16>

  FIG. 3 shows an external configuration example of the current collector plate. The configuration shown in FIG. 3 is an example, and the present invention is not limited to such a configuration.

  The anode current collector plate 12 and the cathode current collector plate 16 are, for example, as shown in FIG. 3A, a connection portion 41 that makes electrical contact with the anode portion 6 or the cathode portion 8 of the capacitor element 4, and the connection portion 41. An exposed portion 40 formed in part is provided. For the anode current collector plate 12 and the cathode current collector plate 16, for example, an aluminum alloy or the like is used as a metal that is conductive and easily processed by pressing. For example, the connecting portion 41 may have a single flat plate shape, or a plurality of regions having different widths and heights may be formed in accordance with the shape of the anode portion 6 or the cathode portion 8 to be connected. For the formation of the connecting portion 41, press working may be used in which a metal material is sandwiched between the mold and the pressing jig and pressed.

  The exposed portion 40 is, for example, on the center side of the connecting portion 41, and the formation position is determined in accordance with the installation position of the external terminal. The exposed portion 40 includes, for example, a flat mounting portion 42 on the ceiling portion and an inclined portion 44 that is inclined from the mounting portion 42 toward the center side of the capacitor element 4. The mounting portion 42 is formed in a square, rectangular, or trapezoidal shape, is formed in parallel with or close to the plane of the connection portion 41, and is in surface contact with the end surface portion of the external terminal. The mounting portion 42 preferably has, for example, an area equivalent to the end surface portion of the external terminal, but the area may be set based on an area where electrical connection can be ensured or an increase or decrease in internal resistance of the contact surface.

  The exposed portion 40 has a side wall portion 46 on one side with respect to the outer peripheral direction of the capacitor 2. The side wall portion 46 is a surface portion formed by protruding a part of the connection portion 41 upward. The side wall portion 46 is an example of a notch surface according to the present disclosure, and the thickness thereof is equal to the thickness of the connection portion 41. As will be described later, the side wall portion 46 is an example of a welding surface on which a welding process is performed between the external terminal placed.

  In the side wall portion 46, a cutout portion 48 formed at the time of forming the exposed portion 40 is formed on the entire surface or a part of the side wall portion 46 together with at least a boundary portion with the mounting portion 42. The notch 48 has a predetermined angle formed between the mounting surface 42 and a cut surface formed by cutting the surface side of a part of the connecting portion 41 or penetrating to the bottom side. A corner 49 is included. The cutout portion 48 of the side wall portion 46 has a flat surface or a cut surface shape by a jig cut by cutting. The range of the notch 48 varies depending on the cutting depth with respect to the connecting portion 41. That is, in the formation of the exposed portion 40, when the connection portion 41 is penetrated and cut, the side wall portion 46 is formed with, for example, a notch 48 corresponding to the thickness of the connection portion 41, whereas the connection portion When cutting to a depth that does not allow 41 to penetrate in the thickness direction, a cutout portion 48 corresponding to the cutting depth is formed in a part of the side wall portion 46. Regardless of the cutting depth, the corner portion 49 between the side wall portion 46 of the exposed portion 40 and the mounting portion 42 is a surface portion of the connecting portion 41, and thus becomes a notch portion 48.

  The width W1 of the exposed portion 40 may be formed wider than the width of the external terminal, for example. The width W1 may be equal to the width of the cutout portion 48 that cuts the connection portion 41. Further, the width W1 of the exposed portion 40 may be formed, for example, equal to or wider than the lateral width of the placement portion 42.

  In the exposed portion 40, a through hole 50 may be formed on the bottom side of the side wall portion 46, for example. The through hole 50 is formed by penetrating the connection portion 41 or by being deeply cut away from the connection portion 41. The exposed height h1 of the exposed portion 40 may be set, for example, so as to form a space in which the side wall portion 46 and the external terminal can be welded. You may set so that the hole 50 may not be formed.

  Further, for example, as shown in FIG. 3B, the connection portion 41 is cut by cutting part or all of the boundary surface with the exposed portion 40 with respect to the back surface side to be connected to the anode portion 6 or the cathode portion 8. A notch 52 is formed. The notch 52 is formed differently depending on, for example, the depth of cutting with respect to the connecting portion 41. That is, when notched so as to penetrate through the connecting portion 41, the entire boundary portion of the connecting portion becomes the notched portion 52, and when only the surface side of the connecting portion 41 is notched, A cutout portion 52 is formed only on the front surface side of the connection portion 41, and a part of the connection portion 41 extends toward the exposed portion 40 on the back surface side of the connection portion 41 or a fracture surface is exposed.

  The shape of the notch 52 is the same as the notch 48 on the exposed portion 40 side, and the surface is flat or cut by a jig cut by a jig. Since the boundary surface with the exposed portion 40 on the back side of the connection portion 41 is not subjected to the welding process, the shape of the notch 52 remains even after the capacitor 2 is manufactured.

  <Connection of current collector plate to capacitor element>

  The anode current collector plate 12 and the cathode current collector plate 16 are arranged at predetermined positions with respect to the anode portion 6 or the cathode portion 8 of the capacitor element 4 as shown in FIG. By irradiating, the element connecting portion 54 is melted and connected. For the arrangement positions of the anode current collector plate 12 and the cathode current collector plate 16, for example, a positioning jig (not shown) may be used for the capacitor element 4. For this positioning jig, for example, a method of determining the arrangement interval between the anode current collector plate 12 and the cathode current collector plate 16 and pressing and fixing the position of each current collector plate with respect to the capacitor element 4 may be used. Further, the current collector plate and the external terminal are, for example, as shown in FIG. 4B, the side wall portions of the exposed portions 40 of the anode current collector plate 12 and the cathode current collector plate 16 and the side surfaces of the anode terminal 10 or the cathode terminal 14. Arrange them so that they are flush with each other.

  In addition, although the case where the inclination part 44 was formed by the formwork shape of press work was shown for the exposed part 40, it is not restricted to this, The inclination part 44 does not need to be formed. In this case, the exposed portion 40 may be provided with a side wall portion formed by pressing on the surface facing the center side of the capacitor element 4.

  <About laser welding to current collector plate>

  FIG. 5 shows a processing example of the welding connection between the current collector plate and the external terminal. In this welding connection, for example, as shown in FIG. 5, the current collector plates 12, 16 are positioned on the element end face of the capacitor element 4, and the outer periphery of the terminal components 60, 62 of the external terminals placed on the exposed portion 40. Laser irradiation is performed on the side surface. This laser irradiation may be performed simultaneously on a plurality of external terminals, for example, or sequentially. Moreover, the laser irradiation to each terminal component 60 and 62 may be performed once by adjusting the laser intensity and the irradiation range to be irradiated, or may be performed in a plurality of times.

  In the exposed portions 40 of the anode current collector plate 12 and the cathode current collector plate 16, at least a notch portion 48 formed by cutting is formed at a boundary portion between the mounting portion 42 and the side wall portion 46. The connecting portion between the portion 46 and the terminal components 60 and 62 on the placement portion 42 is in a continuous flat state without causing cracks or the like. Therefore, if laser irradiation is performed on such a connecting portion in a planar state and welded, a void called a void or the like is not generated inside the welded portion.

  <About the formation of the exposed part of the current collector plate>

  FIG. 6 shows an example of the current collector plate forming step.

  The formation of the anode current collector plate 12 and the cathode current collector plate 16 includes a notch process for the connection part 41 and a pressing process for forming the exposed part 40. In the notch step, for example, as shown in FIG. 6A, a notch jig 64 is pressed against the metal plate formed in the shape of each current collector plate from the upper surface side, that is, the sealing body welding side. The notch jig 64 may be, for example, a cutting blade, a laser cutter, a water jet cutter, or the like, or may be cut and bent as long as the cut surface can be precisely processed. In the notch process, the notch jig 64 is pressed to a set depth with respect to the thickness direction of the metal plate, and cutting is performed linearly in accordance with the set width. As a result, a notch 48 is formed in a part of the connecting portion 41 of each current collector plate. The notch 48 prevents transmission of the applied external force by making the adjacent portion of the connecting portion 41 independent.

  Next, in the pressing step, as shown in FIG. 6B, for example, a pressing jig (not shown) is pressed from the lower side of the metal plate in accordance with the formation position of the notch 48, and a predetermined external force F is applied. The external force F may be set in consideration of, for example, the material of metal constituting the current collector plate, temperature, and the like. Thus, the metal plate is plastically deformed and exposed to a predetermined height, thereby forming the exposed portion 40 on each current collector plate.

  In the pressing step, for example, in order to deform the metal plate into a predetermined shape, a fixing frame (not shown) may be used, or a method such as heating or cooling to a predetermined temperature may be taken.

  Thus, each collector plate does not act on the connecting portions 41 on both sides adjacent to each other with the notch 48 as a boundary, and at least a corner portion 49 having a predetermined shape is formed on the surface side of the connecting portion 41. .

  <Capacitor manufacturing process>

  FIG. 7 shows an example of a capacitor manufacturing process. This capacitor manufacturing process is an example of a method for manufacturing an electricity storage device and a method for manufacturing a current collector plate according to the present disclosure, and the present invention is not limited to such processing procedures and processing contents.

  For the manufacture of the capacitor, the current collector plates 12 and 16 are formed. In this step, for example, the cutout portion 48 is formed in a part of the flat connection portion 41, and the exposed portion 40 is formed by pressing from one side (S1).

  As a manufacturing process of the capacitor element 4, the anode body 30 and the cathode body 32 are laminated via the separator 34, and then wound, and the lead-out terminal is drawn out from each electrode body, so that the anode portion 6 and the cathode portion 8 are connected. Form (S2).

  The current collector plates 12 and 16 are installed at predetermined positions of the respective lead terminals (S3), and the current collector plates and the lead terminals are welded (S4).

  Terminal components are installed on the current collector plates 12 and 16 (S5). Each terminal component is integrated with, for example, the sealing body 22, and the capacitor element 4, the sealing body 22, and the terminal component are connected via the current collector plates 12 and 16.

  Laser irradiation is performed from the side surface side of the capacitor element 4, and the current collector plates 12, 16 and the terminal parts are laser-welded (S6).

  According to such a configuration, the following effects can be obtained.

  (1) It is possible to improve the connection strength and reduce the internal resistance at the connection portion between the current collector plate and the terminal component without generating a gap in the welded portion between the current collector plate and the terminal component.

  (2) By improving the forming accuracy of the exposed portion of the current collector plate to be connected to the terminal component, the accuracy of welding connection between the current collector plate and the terminal component is increased, and the reliability of the manufacturing process of the electricity storage device is improved.

  (3) By simplifying the shape of the current collector plate by cutting out a part of the current collector plate and stabilizing the molded shape of at least the portion to be welded to the terminal component, the current collector plate can be simplified.

  [Second Embodiment]

  FIG. 8 shows a configuration example of a current collector plate used in the electricity storage device according to the second embodiment. The configuration shown in FIG. 8 is an example, and the present invention is not limited to such a configuration.

  In the anode current collector plate 12 and the cathode current collector plate 16, a so-called arched exposed portion 70 is formed at the center portion of a flat plate-shaped connecting portion 71 as shown in FIG. The exposed portion 70 has a rectangular mounting portion 72 formed at an angle parallel to or close to the connecting portion 71, for example. An inclined surface that is inclined toward the connection portion 71 is formed on each of the two short sides. Further, two long sides directed toward the outer peripheral side or the center side of the capacitor element 4 are provided with side wall portions 78 and 82 formed in a direction orthogonal to the connection portion 71, respectively. The side wall portions 78 and 82 are surface portions formed by raising a part of the connection portion 71 upward, and the thickness thereof is equal to the thickness of the connection portion 71.

  The side wall portions 78 and 82 have at least a boundary portion with the mounting portion 72, as well as cutout portions 74 formed on the entire surface or a part of the side wall portions 78 and 82 at a plurality of locations when the exposed portion 70 is formed. 76 is formed. The notches 74 and 76 are predetermined portions formed between the mounting surface 72 and a cut surface formed by cutting the surface side of a part of the connecting portion 71 or penetrating to the bottom side. Angle corners 83, 84 are included. The cutout portions 74 and 76 of the side wall portions 78 and 82 have a planar shape or a cut surface shape by a jig cut by cutting. When the cutout portions 74 and 76 penetrate the connection portion 71, a through hole 80 is formed in the exposed portion 70, for example, on the bottom side of the side wall portions 78 and 82.

  As shown in FIG. 8B, the current collector plate provided with the exposed portion 70 has either one of the side wall portions 78 and 82 arranged flush with the end surface of the terminal component of the external terminal. In order to connect the current collector plate to the anode part 6 or the cathode part 8, the element connection part 54 may be melted and connected by irradiating the connection part 71 with laser as described above.

  For example, as shown in FIG. 8C, the current collector plate and the external terminal are disposed at the side wall portion 78 or the side wall portion 82 of the exposed portion 70 of the anode current collector plate 12 and the cathode current collector plate 16. What is necessary is just to arrange | position so that the side surface side of the cathode terminal 14 may become flush.

  In the forming process of the exposed portion 70, as described above, a notch process for the connecting portions 71 of the current collector plates 12 and 16 and a pressing process at a predetermined position may be performed.

  <Effects of Second Embodiment>

  According to such a configuration, the following effects can be obtained.

  (1) By forming notches 74 and 76 in parallel on the connecting portion 71 and pressing the portions between the notches 74 and 76 to expose them, the portion that is stretched during press working is limited. , The influence of metal elongation is reduced and the forming accuracy is increased.

  (2) By forming the notches 74 and 76 at a plurality of locations, the heat received by the current collector plate during welding becomes difficult to escape from the current collector plate, and the weldability is improved.

  [Third Embodiment]

  FIG. 9 shows a configuration example of a current collector plate used in the electricity storage device according to the third embodiment. The configuration shown in FIG. 9 is an example, and the present invention is not limited to such a configuration.

  The anode current collecting plate 12 and the cathode current collecting plate 16 are, for example, as shown in FIG. 9A, a part of the connecting portion 91 is separated from the anode portion 6 or the cathode portion 8 at the central portion of the flat connecting portion 91. The exposed portion 90 is formed by being bent in the direction of bending. For example, the exposed portion 90 is erected in a direction orthogonal to the connecting portion 91. In the exposed portion 90, for example, a placement portion 92 for placing and connecting an external terminal is formed on the upper side. The thickness of the mounting portion 92 is equal to the thickness of the connection portion 91. The placement portion 92 is a part of a notch portion 94 formed by notching the connection portion 91. In addition, an opening 96 formed by bending the mounting portion 92 is formed on the connection portion 91 of the current collector plates 12 and 16.

  For example, as shown in FIG. 9B, the exposed portion 90 is formed with a side wall portion 98 between the connecting portion 91. The side wall portion 98 is a part of the connection portion 91 and is erected in a direction orthogonal to the connection portion 91 by the formation of the exposed portion 90. The side wall portion 98 includes a notch portion 94 that is formed when the exposed portion 90 is molded. That is, the corner portion 99 at the boundary portion between the side wall portion 98 and the mounting portion 92 is formed at a predetermined angle by cutting with the notch jig as described above, and the surface portion Has a flat shape or a cut surface shape by a cut jig.

  In the formation process of the exposed portion 90, as described above, the notch process of the current collector plates 12 and 16 with respect to the connecting portion 91 and the predetermined position of the connecting portion 91 by the pressing process are set to a predetermined angle, for example, the connecting portion 91. May be folded in a direction orthogonal to the plane.

  In the formation process of the exposed portion 90, the notch position and the press position may be set according to the set height of the side wall portion 98.

  <Effect of the third embodiment>

  According to such a configuration, the following effects can be obtained.

  (1) Since the mounting portion to be brought into contact with the external terminal becomes a part of the cutout portion, the metal extension due to press working does not affect the contact accuracy with the external terminal.

  (2) The resistance can be reduced by reducing the area of the mounting surface with respect to the external terminal.

  (3) Since the height of the side wall portion to be welded is determined by the bending position of the connecting portion, the height of the product can be easily adjusted, contributing to the reduction in the height of the electricity storage device.

  [Fourth Embodiment]

  In the formation of the anode current collector plate 12 and the cathode current collector plate 16, a cutting process and a bending process for the connection part 41 may be simultaneously performed as a process for forming the exposed part 40. Further, the exposed portion 40 may be subjected to a molding process in which, for example, after the connecting portion 41 is cut and bent, a part thereof is pressed to adjust the thickness to a predetermined thickness.

  For forming the current collector plate, a processing jig for cutting and bending may be used. The processing jig includes, for example, a support part that fixes a part of the connection part 41, a cutting part that cuts a part of the connection part 41, a part of the cut connection part 41, and a predetermined shape. A pressing unit for pressing is provided. The cutting part may be provided at a boundary portion between the support part and the pressing part, for example, and may be provided with a shearing means for shearing the connecting part 41 of the current collector plate at the position where the notch part 48 described above is formed.

  In the bending step, first, a part of a flat plate-like current collector plate is installed on the support part, and then the pressing part is pushed down to cut at the notch part. Further, the pressing portion is pushed down, and one side of the connecting portion is pressed against the pressing portion, and the exposed portion 40 is formed.

  Next, as a forming step of the exposed portion 40, for example, the placement portion 42 side which is a bent portion is compressed in the thickness direction. In such a compression process, for example, a pressing jig may be used. Thereby, the mounting part 42 is formed to a thickness of, for example, 1 [mm] as a predetermined thickness t by pressing. At this time, the connection part 41 is extended by the press so that the notch part 46 side is directed toward the cut surface. Thereby, the through-hole 50 formed in the connection part 41 is narrowed. In particular, it is preferable that the notch 46 is in contact with the cut surface and no gap such as the through hole 50 is provided. By narrowing the through hole 50, it is possible to prevent scattering of welding powder during welding with an external terminal in a subsequent process.

  [Other Embodiments]

  With respect to the embodiment described above, the features and modifications thereof are listed below.

  (1) The notch portion of the current collector plate has been illustrated as penetrating the connection portion, but is not limited thereto. You may cut out from the surface side of a connection part to the predetermined depth, and may form a notch part. That is, the notch part forms a corner part of a predetermined shape by the notch on the surface side of the connection part, and the connection part is thinned at the notch position. In the forming process of the exposed portion, when pressing from the opposite surface according to the position of the notch portion, the notch portion is pushed up to a predetermined height, and the thin portion is stretched or plastically deformed. As a result, a gap such as a through hole is not formed between the connection portion and the exposed portion in the current collector plate. Even in such a configuration, the current collector plate is molded into a set shape by cutting out the boundary portion between the surface of the exposed portion and the welding surface with respect to the position where the external terminal is disposed. The connection area can be ensured, and even if it is welded, it is possible to prevent the formation of voids in the interior.

  (2) In the above-described embodiment, the case where the shape of the exposed portion is made different depending on the number of notches with respect to the connecting portion has been described, but the present invention is not limited to this. The exposed portion of the current collector plate is formed into a predetermined shape by cutting out a part or all of the surface side to be welded to the external terminal, and any type of mounting surface is provided for mounting the external terminal. It may be formed into a shape.

  (3) In the above embodiment, when the connection portion 41 is cut as the notch, the notch angle is set to the direction orthogonal to the connection portion 41 or an angle close thereto, but the present invention is not limited to this. The angle of cutting with respect to the connecting portion 41 may be, for example, an inclination direction with a predetermined angle with respect to the connecting portion 41.

As described above, the most preferable embodiment of the present invention has been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist, and such modifications and changes are included in the scope of the present invention.

  The power storage device, the method for manufacturing the power storage device, the current collector plate, and the method for manufacturing the current collector plate according to the present invention improve the formation accuracy of the current collector plate and stabilize the connection state between the current collector plate and the external terminal. It can be beneficial.

2 Capacitor 4 Capacitor element 6 Anode portion 8 Cathode portion 10 Anode terminal 12 Anode current collector plate 14 Cathode terminal 16 Cathode current collector plate 20 Exterior case 22 Sealing body 24 Space portion 26 Base member 28 Sealing portion 30 Anode body 32 Cathode body 34 Separator 40, 70, 90 Expressing part 41, 71, 91 Connection part 42, 72, 92 Placement part 44 Inclination part 46, 78, 82, 98 Side wall part 48, 52, 64, 74, 76, 94 Notch part 49, 83, 84, 99 Corner 50, 80 Through-hole 54 Element connection 60, 62 Terminal component 96 Opening

Claims (9)

A storage element;
An anode-side electrode lead-out terminal and a cathode-side electrode lead-out terminal formed on the end face of the power storage element;
A current collector plate that is installed in each of the electrode lead terminals and has a cut-out surface at least part of a connection portion that is connected to the electrode lead terminals, protruding from the connection portion;
A terminal component is connected to the upper surface of the protruding portion from which the cutout surface protrudes, and an external terminal in which the terminal component and the protruding portion of the current collector plate are connected by welding,
An electricity storage device comprising:   2. The power storage device according to claim 1, wherein the current collector plate has the cut-out surface at least at an upper end surface portion on which the terminal component is installed.   The power storage device according to claim 1, wherein the projecting portion includes a mounting surface having an angle parallel or nearly parallel to a contact surface of the terminal component on the upper surface side. Forming an anode-side electrode lead-out terminal and a cathode-side electrode lead-out terminal on the end face of the storage element;
Forming a current collector plate by projecting at least a part of the connection part connected to the electrode lead-out terminal, the notched surface;
Installing the current collector plate on each electrode lead terminal;
Connecting a terminal component of an external terminal to the upper surface of the protruding portion from which the cutout surface protrudes, and welding-connecting the terminal component and the cutout surface of the current collector plate;
The manufacturing method of the electrical storage device characterized by including. Passing through a part of the plane of the connecting portion, or cutting out a part of the plane to a predetermined depth to form the notch surface;
Pressing a part of the connection part along the notch surface in a direction intersecting the plane, or bending a part of the connection part at a predetermined angle along the notch surface;
The manufacturing method of the electrical storage device of Claim 4 characterized by the above-mentioned.   5. The method according to claim 4, further comprising: pressing a part of a plane of the connection part while cutting out in a crossing direction with respect to the plane of the connection part to project the notched surface. Manufacturing method for electric storage device.   The method for manufacturing an electricity storage device according to claim 5, further comprising a step of narrowing a gap generated in the connection portion by a step of forming a protruding portion from which the cutout surface protrudes. . A current collector connected to an external terminal of the electricity storage device,
It is installed on each of the anode-side electrode lead-out terminal and the cathode-side electrode lead-out terminal formed on the end face of the electricity storage element, and a notch surface at a part of the connecting portion connected to the electrode lead-out terminal protrudes A current collector plate characterized by that. A method of manufacturing a current collector connected to an external terminal of an electricity storage device,
Installed on the anode-side electrode lead-out terminal and the cathode-side electrode lead-out terminal formed on the end face of the electricity storage element, respectively, and projecting a cut-out surface in which a part of the connecting portion connected to the electrode lead-out terminal is cut out Process,
Including
A terminal component of the external terminal is connected to an upper surface of a projecting portion projecting the notch surface, and the terminal component and the projecting portion of the current collector plate are welded and connected. Production method.

Images