JP2011134752A - Connecting member for welding, capacitor module using connecting member for welding, and manufacturing method for capacitor module using connecting member for welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting member for welding with which a capacitor module 200 having electric double-layer capacitor cells 10 which are connected in series can be readily manufactured. <P>SOLUTION: The connecting member 100 for welding includes a first sidewall 101, a second sidewall 102 opposite to the first sidewall 101, first and second connecting portions 105 and 106 connecting the first sidewall 101 to the second sidewall 102, an insertion opening 107 encircled with the first and second side walls 101 and 102 and the first and second connecting portions 105 and 106, and a pin terminal 108, extending out from the first sidewall 101. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a welding joint member used for manufacturing a capacitor module configured by connecting a plurality of capacitor cells in series, a capacitor module using such a welding joint member, and the welding joint member The present invention relates to a method for manufacturing a capacitor module using the.

  In an electric double layer capacitor, the multilayer type generally has a higher energy density than other types such as a cylindrical type. Multilayer electric double-layer capacitor cells have a lead electrode attached to a laminate in which a polarizable electrode is laminated with a separator, and the laminate is further impregnated with an electrolyte, and is then placed in a laminate film and pulled out from the opening of the laminate. The electrode is sealed in the drawn state.

As described in Non-Patent Document 1, since an electric double layer capacitor has a low withstand voltage, a capacitor module is configured by connecting a plurality of capacitor cells in series. Thus, when using multilayer capacitor cells connected in series, an appropriate pressurizing mechanism is provided because the capacitor cells expand and contract in a direction perpendicular to the multilayer surface with charge and discharge (Patent Document 1). Further, Patent Document 2 discloses a capacitor module in which lead electrodes of a plurality of electric double layer capacitor cells are connected in series in relation to FIG.
Ikuo Okamura “Electric Double Layer Capacitor and Power Storage System”, published by Nikkan Kogyo Shimbun, September 30, 2005, 3rd edition, 1st edition, pages 8-9, pages 150-157 JP 2005-93492 A JP 2008-153282 A

  Here, the connection between the electric double layer capacitor cells in the conventional capacitor module will be described with reference to FIG. 12 and FIG. 13 in more detail. As shown in FIG. 12, the capacitor module has a plurality of electric double layer capacitor cells 10 stacked in the thickness direction, and lead electrodes (12, 13) of adjacent cells are electrically connected to each other using a caulking member 30. Manufactured by mechanical connection. FIG. 13 is a development view of the caulking member 30 used for connecting the extraction electrodes of the capacitor cell. The caulking member 30 includes a first clamping piece 31 and a second clamping piece 32 in which a not-shown biting protrusion is formed, and a connecting portion 33 that connects between them. It is configured by folding two clamping pieces. A terminal portion 34 is provided on the first clamping piece 31 so as to extend. This terminal portion 34 is provided for electrical connection with a faston terminal (not shown). Further, the faston terminal is electrically connected to a circuit for monitoring the capacitor cell (parallel monitor. Refer to non-patent document 1 for the parallel monitor). This monitor circuit is provided on a substrate (not shown), and is physically realized by connecting a harness having faston terminals to a connector on the substrate.

  In the caulking member 30 as described above, the protruding electrodes are bitten into the extraction electrode so that the extraction electrodes (12, 13) of the cell are sandwiched between the first clamping piece 31 and the second clamping piece 32. In addition, the electrical and mechanical connection between the extraction electrodes is realized, and the potential of the extraction electrode is taken out from the Faston terminal.

By the way, when it is going to manufacture a capacitor module with the electric double layer capacitor cell made thin, the space | interval of the adjacent crimping members 30 becomes short. When fastening the extraction electrodes (12, 13) with the caulking member 30 as described above, a predetermined tool is used. However, if the interval between the caulking members 30 is shortened, there is a sufficient space for arranging the tool. In addition, there is a problem that it is difficult to manufacture a capacitor module composed of a thin electric double layer capacitor cell by using the conventional extraction electrode connection method using the caulking member 30.

  The present invention solves the above-mentioned problems, and the invention according to claim 1 is directed to a first side wall, a second side wall facing the first side wall, the first side wall, and the first side wall. Two connecting portions for connecting two side wall portions, an insertion opening formed so as to be surrounded by the first side wall portion, the second side wall portion, and the two connecting portions, and extending from the first side wall portion. And a pin terminal portion that is present.

  According to a second aspect of the present invention, in the welding joint member according to the first aspect, a step portion is formed between the first side wall portion and the pin terminal portion.

  The invention according to claim 3 is the welding joint member according to any one of claims 1 to 3, wherein the material is aluminum.

  Moreover, the invention which concerns on Claim 4 is a capacitor module which consists of several capacitor cells which connected extraction electrodes, Comprising: The joining member for welding of any one of Claim 1 thru | or 3 is used. The lead electrodes of the capacitor cell are connected to each other.

  According to a fifth aspect of the present invention, in the capacitor module according to the fourth aspect, the pin terminal portions of the welding joint members adjacent in the stacking direction of the plurality of capacitor cells are staggered. .

  According to a sixth aspect of the present invention, in the capacitor module according to the fourth or fifth aspect, the lead-out electrode of the capacitor cell located at the end of the plurality of capacitor cells is a dummy electrode by a welding joining member. It is connected with the part.

  According to a seventh aspect of the present invention, in the capacitor module according to any one of the fourth to sixth aspects, a substrate member is placed on the stepped portion.

  In the invention according to claim 8, the lead-out electrode of the capacitor cell is inserted into the insertion opening of the welding joint member according to any one of claims 1 to 3, and the vicinity of the insertion opening. A capacitor module manufacturing method characterized in that a plurality of capacitor cells are connected by integrating the end face portion of the lead electrode and the extraction electrode by welding.

  The invention according to claim 9 is characterized in that, in the method for manufacturing a capacitor module according to claim 8, YAG laser welding is used.

  According to the welding joint member, the capacitor module using the welding joint member, and the method of manufacturing the capacitor module using the welding joint member according to the present invention, the capacitor in which the electric double layer capacitor cells 10 made thin are connected in series. The module 200 can be easily manufactured. Moreover, volume efficiency improves by using the electric double layer capacitor cell 10 made thin.

  Further, in the welding joint member according to the present invention, the capacitor module using the welding joint member, and the method for manufacturing the capacitor module using the welding joint member, the material of the welding joint member 100 is the extraction electrodes 12 and 13. The same type of metal (aluminum) is used, and by integrating the same type of metal by welding, the electrical resistance at the connection can be lowered, and there is no deterioration due to electric field corrosion. It is possible to reduce the rate of increase.

  Further, in the welding joint member according to the present invention, the capacitor module using the welding joint member, and the method for manufacturing the capacitor module using the welding joint member, the material of the welding joint member 100 is the extraction electrodes 12 and 13. The same kind of metal (aluminum) is used, and the members are integrated by welding the same kind of metal, so that the mechanical strength at the connection portion is increased.

  Further, according to the welding joint member, the capacitor module using the welding joint member, and the capacitor module manufacturing method using the welding joint member according to the present invention, unlike the caulking member 30, the cross-sectional area of the connecting portion is As a result, the allowable current value can be improved.

  In addition, according to the capacitor module using the welding joint member and the method for manufacturing the capacitor module using the welding joint member according to the present invention, it is not necessary to use the caulking member 30 fastening tool, and the number of manual processing steps And the productivity can be improved, the stress on the extraction electrodes 12 and 13 associated with the use of the fastening tool can be reduced, and the quality is improved. In addition, an automatic welding apparatus can be used for welding the welding joining member 100 and the extraction electrodes 12 and 13, and according to this, processing accuracy can be improved and a high quality capacitor module can be provided. can do.

  In addition, the welding joining member 100 according to the present invention is provided with a step portion on which the substrate member 150 can be placed, thereby reducing the harness connecting process as in the prior art and improving the productivity. Can do. Further, when the capacitor module 200 is manufactured, a sufficient insulation distance is ensured in the circuit arrangement on the board member 150 by arranging the pin terminal portions 108 of the welding joining member 100 in a staggered manner. It becomes possible to do. Further, since the conductive pattern on the substrate member 150 and the pin terminal portion 108 can be connected, a conventional faston terminal is not necessary, and stress on the extraction electrodes 12 and 13 when the faston terminal is attached can be eliminated. it can.

1 is a perspective view of an electric double layer capacitor cell 10 constituting a capacitor module according to an embodiment of the present invention. It is a figure explaining the manufacturing process in the manufacturing method of the capacitor module concerning the embodiment of the present invention. It is a figure explaining the manufacturing process in the manufacturing method of the capacitor module concerning the embodiment of the present invention. It is a figure which shows the joining member 100 for welding which concerns on embodiment of this invention. It is a figure which shows the termination | terminus terminal member 120 used together with the joining member 100 for welding which concerns on embodiment of this invention. It is a figure explaining the manufacturing process in the manufacturing method of the capacitor module concerning the embodiment of the present invention. It is a figure explaining application of the termination terminal member 120 to the electric double layer capacitor cell 10 of the edge part position of a capacitor module. It is a figure explaining application of the termination terminal member 120 to the electric double layer capacitor cell 10 of the edge part position of a capacitor module. It is a figure explaining the manufacturing process in the manufacturing method of the capacitor module concerning the embodiment of the present invention. It is a perspective view of the board | substrate member 150 used with the joining member 100 for welding which concerns on embodiment of this invention. It is a figure which shows the capacitor module 200 manufactured using the joining member 100 for welding which concerns on embodiment of this invention. It is a figure explaining the manufacturing process of the conventional capacitor module. It is a figure explaining the crimping member 30 used for manufacture of the conventional capacitor module.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an electric double layer capacitor cell 10 constituting a capacitor module according to an embodiment of the present invention. The electric double layer capacitor cell 10 is a multilayer electric double layer capacitor cell. More specifically, the capacitor body is composed of a positive electrode body (positive electrode body) and a negative electrode body (negative electrode body) in a predetermined laminate by alternately stacking them with a separator interposed therebetween. The A positive electrode body and a negative electrode body are comprised in flat form from the collector electrode and the polarizable electrode (activated carbon electrode) formed in the both surfaces. These collector electrodes are made of a rectangular metal foil (aluminum foil), and a strip-like conductive portion (lead) is integrally formed on one side of a rectangular plane. The conductive parts have the same poles converged and joined to form a positive extraction electrode 12 and a negative extraction electrode 13. Both the positive extraction electrode 12 and the negative extraction electrode 13 are made of aluminum.

  And in the periphery of the container part 11 formed from the resin film (for example, aluminum laminate) of the laminated structure containing a metal layer, a part of the positive extraction electrode 12 and the negative extraction electrode 13 is extracted, and three except one side. The sides are heat-sealed (heat sealed). More specifically, the container portion 11 can be opened at one side from which the positive extraction electrode 12 and the negative extraction electrode 13 protrude, and an electrolyte is injected into the inside through the opening to impregnate the electrolyte. When the processing is completed, the remaining one side is thermally welded (heat sealed) in a state where air and moisture are removed by a vacuum pump, and the electric double layer capacitor cell 10 is manufactured.

  Generally, the electric double layer capacitor cell 10 configured as described above is used as an electric double layer capacitor module in which a plurality of electric double layer capacitor cells 10 are connected in series because the withstand voltage is low. At this time, it is necessary to connect the positive lead electrode 12 of one electric double layer capacitor cell 10 and the negative lead electrode 13 of another electric double layer capacitor cell 10. By using the member 100, it has the characteristic point which can perform this connection simply and efficiently, and this is demonstrated in detail below.

  When the electric double layer capacitor cells 10 are connected to form a capacitor module, the positive extraction electrode 12 is cut by the XX ′ line and bent by 90 ° along the AA ′ line. The negative extraction electrode 13 is cut by the YY ′ line and bent at 90 ° by the BB ′ line. At this time, the positive extraction electrode 12 and the negative extraction electrode 13 are bent in opposite directions, and the extraction electrode is substantially L-shaped as shown in FIG.

  Here, in the bending process of the extraction electrode, two patterns of the electric double layer capacitor cell 10 shown in FIGS. 2A and 2B are prepared, and the cells are connected as shown in FIG. In addition, the electric double layer capacitor cell 10 having the pattern of FIG. 2A → the electric double layer capacitor cell 10 having the pattern of FIG. 2B → the electric double layer capacitor cell 10 having the pattern of FIG. 2A → FIG. The electric double layer capacitor cell 10 →. The number of electric double layer capacitor cells 10 to be connected when configuring the electric double layer capacitor module is arbitrary. As a previous stage for connecting the extraction electrodes, the electric double layer capacitor cells 10 to be connected are collectively assembled.

  FIG. 4 is a view showing a welding joining member 100 according to an embodiment of the present invention. 4A is a perspective view of the welding joining member 100, and FIG. 4B is a top view of the welding joining member 100. FIG. The welding joining member 100 has a function of connecting the extraction electrodes of the adjacent electric double layer capacitor cells 10 and further functions as a terminal portion for detecting the potential of these extraction electrodes. Also, it functions as a base member for mounting and fixing a substrate member provided with a parallel monitor circuit for monitoring the state of the electric double layer capacitor cell 10 based on the detected potential. In FIG. 4, 100 is a welding joint member, 101 is a first side wall portion, 102 is a second side wall portion, 103 is a first end surface portion, 104 is a second end surface portion, 105 is a first connecting portion, and 106 is a second side portion. The connecting portion 107 is an insertion opening portion, 108 is a pin terminal portion, and 109 is a step portion.

  As the material of the welding joining member 100, the same kind of metal (aluminum) as the extraction electrodes 12 and 13 is used. This welding joining member 100 has a first side wall portion 101 and a second side wall portion 102 facing the first side wall portion 101 as a base material. And the 1st end surface part 103 which is the upper surface part of the 1st side wall part 101, and the 2nd end surface part 104 which is the upper surface part of the 2nd side wall part 102 come to become the irradiation path | route in the YAG laser welding mentioned later. ing. Two first connection parts 105 and second connection parts 106 are provided so as to connect the first side wall part 101 and the second side wall part 102. The first connecting portion 105 and the second connecting portion 106 are both provided so as to extend from the first end surface portion 103 and the second end surface portion 104.

  In the welding joining member 100, an insertion opening 107 is formed so that the first side wall 101, the second side wall 102, the first connecting part 105, and the second connecting part 106 surround four sides. The insertion opening 107 is an opening through which the extraction electrodes 12 and 13 to be connected of adjacent electric double layer capacitor cells 10 are inserted. The insertion opening 107 has such an opening width that the two extraction electrodes are substantially fitted into the insertion opening 107 when the extraction electrodes 12 and 13 are inserted.

  Further, the welding joining member 100 is provided with a pin terminal portion 108 extending from the first side wall portion 101 and standing upward, and this pin terminal portion 108 is an electric wiring pattern on the board member. It functions as an electrical connection part. Further, a step 109 is formed at the base of the pin terminal portion 108 between the first side wall portion 101 and the pin terminal portion 108 so that the substrate member can be placed and fixed. It has become. The pin terminal portion 108 may be subjected to predetermined plating, for example, so as to consider the electrical affinity with the metal used on the substrate member.

  FIG. 5 is a view showing a terminal terminal member 120 used in combination with the welding joining member 100 according to the embodiment of the present invention. In FIG. 5, 120 is a termination terminal member, 121 is a dummy electrode portion, 122 is a connecting portion, and 123 is a termination electrode portion. The termination terminal member 120 is used for the first cell and the last cell in the series connection of the plurality of electric double layer capacitor cells 10 constituting the capacitor cell module. This terminal member 120 is used for the lead cell of the first cell and the last cell, so that the welding joining member 100 can be used in the cells located at the end of the series connection and the capacitor module. The extraction electrode is provided.

The termination terminal member 120 includes a dummy electrode part 121 used as a connection part to the extraction electrodes 12 and 13 of the (first or last) electric double layer capacitor cell 10 and a termination electrode used as an extraction electrode of the capacitor module. Part 123 and a connecting part 122 that connects the dummy electrode part 121 and the terminal electrode part 123. As the material of the terminal member 120, the same kind of metal (aluminum) as the welding joint member 100 and the extraction electrodes 12 and 13 is used.

  Next, a method of connecting the extraction electrodes 12 and 13 of the electric double layer capacitor cell 10 using the welding joint member 100 configured as described above will be described. FIG. 6 is a view for explaining a manufacturing process in the method for manufacturing a capacitor module according to the embodiment of the present invention, and a method of attaching the welding joining member 100 when connecting the extraction electrodes 12 and 13 by the welding joining member 100. Is illustrated.

  The welding joining member 100 is attached so that the extraction electrodes 12 and 13 of the adjacent electric double layer capacitor cell 10 are inserted through the insertion opening 107. Here, the electric double layer capacitor cell 10 at the forefront of FIG. 6 is designated as the first, and then the second electric double layer capacitor cell 10, the third electric double layer capacitor cell 10... Assume that the R side and the L side on both sides of the electric double layer capacitor cell 10 are defined as shown in FIG.

  In attaching the welding joining member 100 to the extraction electrode, the pin terminal portion 108 of the welding joining member 100 used for connecting the first and second electric double layer capacitor cells 10 is arranged on the L side. On the contrary, the pin terminal portion 108 of the welding joint member 100 used for connection of the third and fourth electric double layer capacitor cells 10 is arranged on the R side (hereinafter referred to as “R”). The same). That is, the pin terminal portions 108 of the welding joining members 100 adjacent in the same row (either the L side or the R side) are arranged in a staggered manner as shown by the arrows in FIG. A substrate member is mounted on the welding joint member 100 using the step portion 109. By attaching the welding joint member 100 so that the pin terminal portions 108 are staggered in this way, the substrate is mounted. In the circuit arrangement on the member 150, a sufficient insulation distance can be secured.

  FIG. 7 is a diagram for explaining the application of the termination terminal member 120 to the electric double layer capacitor cell 10 at the end portion of the capacitor module. Among the series connection of the plurality of electric double layer capacitor cells 10 constituting the capacitor cell module, for the first cell and the last cell, the dummy electrode portion 121 of the termination terminal member 120 and the extraction electrode 12 (13) The dummy electrode portion 121 and the extraction electrode 12 (13) are attached so as to be inserted through the insertion opening 107 of the welding joining member 100. By using the termination terminal member 120 in such a form, it is possible to handle the extraction electrodes of the first cell and the last cell in the same manner as other extraction electrodes.

  FIG. 8 shows a state where the welding joining members 100 are attached to all the electric double layer capacitor cells 10 constituting the capacitor module. As described above, the pin terminal portions 108 of the welding joining members 100 adjacent in the cell stacking direction in the L-side row are staggered. Similarly, the pin terminal portions 108 of the welding joining members 100 adjacent in the cell stacking direction in the R-side row are staggered. FIG. 8 shows an example of a capacitor module in which 80 electric double layer capacitor cells 10 are connected in series. Two cells, a first electric double layer capacitor cell 10 and an 80th electric double layer capacitor cell 10, are shown. The terminal terminal member 120 is applied to the terminal terminal portion 123 of each terminal terminal member 120 so as to function as an extraction electrode as a capacitor module.

As shown in FIG. 8, in the present invention, the extraction electrodes are connected to each other by attaching the welding connection member 100 to the extraction electrodes 12 and 13 from directly above, and such a welding connection member 100 is used. According to the method, unlike the method using the caulking member 30 that requires a conventional fastening tool, it is possible to easily manufacture the capacitor module 200 in which the thin electric double layer capacitor cells 10 are connected in series. Moreover, the volume efficiency of a module improves by using the electric double layer capacitor cell 10 reduced in thickness.

  Further, in the present invention, it is not necessary to use the crimping member 30 fastening tool, the number of manual processing steps can be reduced, the productivity can be improved, and the extraction electrodes 12 and 13 associated with the fastening tool are used. Can reduce stress and improve quality.

  Next, after attaching the welding joining member 100 to all the electric double layer capacitor cells 10 as described above, the step of integrating the welding joining member 100 and the extraction electrodes 12 and 13 by YAG laser welding is performed. carry out. FIG. 9 is a view of the welding joint member 100 and the extraction electrodes 12 and 13 as viewed from above, and the locus indicated by the dotted line indicates the irradiation path of the YAG laser used for welding. The welding joining member 100 and the extraction electrodes 12 and 13 are firmly joined by YAG laser welding using such a zigzag path. Here, the same kind of metal (aluminum) as that of the extraction electrodes 12 and 13 is used as the material of the welding joining member 100, and the electric resistance at the connection portion is obtained by integration by welding of the same kind of metal. Can be lowered, and deterioration due to electric field corrosion or the like is eliminated, and the rate of increase in resistance due to long-term use can be reduced.

  Moreover, since the same kind of metal (aluminum) as that of the extraction electrodes 12 and 13 is used as the material of the welding joining member 100, the members are integrated by welding of the same kind of metal. Rise.

  Moreover, according to the electrode connecting method using the welding joining member 100 of the present invention, unlike the connecting method using the crimping member 30, the cross-sectional area of the connecting portion is increased, and the allowable current value can be improved.

  Further, a YAG laser automatic welding apparatus can be used for welding the welding joining member 100 and the extraction electrodes 12 and 13, and according to this, the processing accuracy can be improved, and a high quality capacitor module. Will be able to provide.

  Next, a process of attaching the substrate member 150 provided with a parallel monitor circuit (not shown) and completing the capacitor module 200 will be described. FIG. 10 shows a substrate member 150 used with the welding joining member 100 of the present invention, and this substrate member 150 is provided with a pin insertion opening 151 as shown.

  As shown in FIG. 11, the four substrate members 150 are placed on the electric double layer capacitor cell 10 using the step portion 109 of the welding joining member 100. Further, when placing the board member 150 on the stepped portion 109, each pin terminal portion 108 is arranged so as to penetrate the pin insertion opening 151. The pin terminal portion 108 penetrating from the pin insertion opening 151 is electrically connected to a conductive pattern (not shown) provided on the substrate member 150. In the capacitor module 200 using the welding joint member 100 of the present invention, the conventional harness connecting process can be reduced and the productivity can be improved. In the capacitor module 200 using the welding joint member 100 of the present invention, the conductive pattern on the substrate member 150 and the pin terminal portion 108 of the welding joint member 100 penetrating the conductive pattern can be connected. A conventional faston terminal is not required, and stress on the extraction electrodes 12 and 13 when the faston terminal is attached can be eliminated.

The pin terminal portions 108 of the electric double layer capacitor cell 10 shown in FIG. 8 are arranged so that the pin terminal portions 108 of the welding joining members 100 adjacent in the cell stacking direction are arranged in a staggered manner. Further, the pin terminal portions 108 penetrating from the board member 150 are also staggered as shown in FIG. For this reason, as compared with the case where the pin terminal portions 108 are not arranged in a staggered manner, a sufficient insulation distance can be secured in a circuit arrangement (not shown) such as a conductor pattern on the board member 150.

  Incidentally, in FIG. 11, one substrate member 150 is used for the pin terminal portions 108 of approximately 20 electric double layer capacitor cells 10, and four substrate members 150 are used in the entire capacitor module 200. However, if a board member corresponding to the pin terminal portions 108 of approximately 80 (all) electric double layer capacitor cells 10 is used, the pin terminal portions 108 associated with variations in the thickness of the electric double layer capacitor cells 10 are used. It becomes difficult to cope with the variation in the position of. On the other hand, as in the embodiment shown in FIG. 11, about 20 electric double layer capacitor cells 10 are shared by one board member 150, and the board member is divided and configured, so that the pin terminal portion In addition to absorbing an error in the position 108, mechanical stress can be reduced between the substrate member 150 and the pin terminal portion 108, and the quality can be stabilized.

  According to the welding joint member according to the present invention as described above, the capacitor module using the welding joint member, and the method for manufacturing the capacitor module using the welding joint member, the electric double layer capacitor cell 10 having a reduced thickness is obtained. Capacitor modules 200 connected in series can be easily manufactured. Moreover, the volume efficiency of the capacitor module 200 is improved by using the thinned electric double layer capacitor cell 10.

DESCRIPTION OF SYMBOLS 10 ... Electric double layer capacitor cell 11 ... Container part 12 ... (positive) extraction electrode 13 ... (negative) extraction electrode 30 ... Caulking member 31 ... 1st clamping piece 32 ... 2nd clamping piece 33 ... Connection part 34 ... Terminal part 100 ... Joining member 101 for welding ... 1st side wall part 102 ... 2nd side wall part 103 ... 1st end surface Part 104 ... Second end face part 105 ... First connecting part 106 ... Second connecting part 107 ... Insertion opening 108 ... Pin terminal part 109 ... Step part 120 ... Termination Terminal member 121... Dummy electrode portion 122... Connection portion 123 .. Termination electrode portion 150... Board member 151.

Claims (9)

A first side wall and a second side wall facing the first side wall;
Two connecting portions for connecting the first side wall portion and the second side wall portion;
An insertion opening formed so as to be surrounded by the first side wall, the second side wall, and the two connecting portions;
And a pin terminal portion extending from the first side wall portion. The welding joining member according to claim 1, wherein a step portion is formed between the first side wall portion and the pin terminal portion. The welding joint member according to any one of claims 1 to 3, wherein the material is aluminum. A capacitor module comprising a plurality of capacitor cells connecting the extraction electrodes,
A capacitor module, wherein the lead electrodes of the capacitor cell are connected to each other using the welding joint member according to any one of claims 1 to 3. The capacitor module according to claim 4, wherein the pin terminal portions of the welding joint members adjacent in the stacking direction of the plurality of capacitor cells are staggered. 6. The capacitor module according to claim 4, wherein the lead-out electrodes of the capacitor cells located at the end portions of the plurality of capacitor cells are connected to the dummy electrode portion by a welding joint member. The capacitor module according to claim 4, wherein a substrate member is placed on the stepped portion. The lead electrode of a capacitor cell is inserted in the insertion opening of the welding joint member according to any one of claims 1 to 3, and an end surface near the insertion opening and the extraction electrode are welded. A method for manufacturing a capacitor module, wherein a plurality of capacitor cells are connected by being integrated. 9. The method of manufacturing a capacitor module according to claim 8, wherein YAG laser welding is used.

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