JP4568646B2 - Manufacturing method of electric double layer capacitor module - Google Patents

Description

  The present invention relates to a method for manufacturing an electric double layer capacitor module including a plurality of capacitor cells in order to correspond to various voltage specifications using an electric double layer capacitor as a constituent unit (capacitor cell).

  2. Description of the Related Art In recent years, as various types of power storage devices, attention has been focused on application technologies of electric double layer capacitors that can be rapidly charged and have long charge / discharge cycle life.

  An electric double layer capacitor includes a laminate composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween, a container that seals the laminate together with an electrolyte, and a pair of electrodes disposed outside the container. And one of the pair of terminals is connected to the positive electrode body and the other is connected to the negative electrode body. About a laminated body, there exist a type wound up to a cylinder type, a type stacked on a flat plate type, and the like.

Such an electric double layer capacitor is often used in a form in which a plurality of capacitor cells are integrated into one module in order to correspond to various voltage specifications using this as a structural unit (capacitor cell) (Patent Document 1). , Patent Document 2). An example thereof will be described with reference to FIG. 9. Reference numeral 1 denotes a capacitor cell, reference numeral 10 denotes a module box, and a plurality of capacitor cells 1 are accommodated in a stacked state in one row inside the box 10. In order to connect a plurality of capacitor cells 1 in series, a pair of terminals (cell terminals) of each capacitor cell 1 are bent in two stages as shown in FIG. 8 (1), and between adjacent capacitor cells 1, The terminals 3a and 3b having different polarities are joined to each other with the respective leading ends as flanges 60a and 60b. A pair of terminals (box terminals) are arranged in the box 10, and the remaining terminals 3 a and 3 b of the capacitor cell 1 positioned at both ends of the plurality connected in series are connected to the box terminal and different polarities.
JP 2002-151365 A JP 2003-272966 A

  In such an electric double layer capacitor module, welding is used to join terminals of different polarities between adjacent capacitor cells 1. In the case of Patent Document 1, although it depends on TIG welding with a small resistance value, TIG welding is troublesome in preparation for heat countermeasures and the workability is not good. Further, the flanges 60a and 60b of the terminals 3a and 3b having different polarities are brought into contact with each other and their uppermost portions (upper end surfaces) are TIG-welded, and the welded portion of TIG welding is raised, so that (1) in FIG. As shown, the height dimension including the joint portion of the terminals 3 of different polarities becomes large.

  The present invention has been made paying attention to such a problem, and the height dimension including the junction of the terminals between the capacitor cells can be kept small, and the junction between these terminals can be processed easily and accurately. An object of the present invention is to provide a rational method for manufacturing an electric double layer capacitor module.

  A first invention is a method of manufacturing a capacitor module composed of a plurality of electric double layer capacitors, the step of assembling a plurality of electric double layer capacitors one by one in series while connecting them one by one, A step of housing a plurality of electric double layer capacitors assembled into a set in a module box, and assembling the electric double layer capacitors into a single stacked state while connecting the electric double layer capacitors one by one in series. The process includes forming a flange by bending one tip side of a pair of terminals in the forward direction for each of the plurality of electric double layer capacitors, and bending the other tip side of the pair of terminals in a reverse direction to form a flange. Of the pair of terminals of the electric double layer capacitor with respect to two of the first electric double layer capacitor and the second electric double layer capacitor Two flanges are joined to each other by joining one flange, and two terminals on the joint side are connected to invert the second electric double layer capacitor so that the second electric double layer capacitor overlaps with the first electric double layer capacitor. The second electric double layer capacitor is folded against the flange of the remaining terminal of the second electric double layer capacitor with respect to the two of the second electric double layer capacitor and the third electric double layer capacitor in the stacked state. The third electric double layer capacitor is formed so that the third electric double layer capacitor overlaps the second electric double layer capacitor in a laminated state by superimposing and joining one flange of the pair of terminals opposite to each other. The terminal on the junction side is folded in two steps to reverse the current, and this is repeated to connect a plurality of electric double layer capacitors one by one in series. Characterized in that it comprises a step of assembling the stacked state of the first column, a while.

  According to a second aspect of the present invention, in the method of manufacturing a capacitor module including a plurality of electric double layer capacitors, a step of assembling a plurality of electric double layer capacitors one by one in series while connecting each one in series, A step of housing a plurality of electric double layer capacitors assembled into a set in a module box, and assembling the electric double layer capacitors into a single stacked state while connecting the electric double layer capacitors one by one in series. In the process, for two of the first electric double layer capacitor and the second electric double layer capacitor, the different polarities of a pair of terminals are overlapped with each other, and one of them is joined to each other. The terminal on the junction side is folded in two stages to invert the second electric double layer capacitor so that the second electric double layer capacitor overlaps the stacked state on the capacitor. For two of the second electric double layer capacitor and the third electric double layer capacitor in the state, a pair of the third electric double layer capacitor with respect to the tip side of the remaining terminal of the second electric double layer capacitor The tip ends of the terminals having different polarities are overlapped and joined together, and the third electric double layer capacitor is inverted so that the third electric double layer capacitor overlaps with the second electric double layer capacitor. Therefore, it is characterized in that it includes a step of assembling a plurality of electric double layer capacitors in series in one row while connecting each of the electric double layer capacitors in series by bending the terminal on the junction side in two stages.

  In the first invention or the second invention, the plurality of electric double layer capacitors are assembled in one row in a stacked state while being connected in series one by one prior to the mounting in the module box. The connection between the double layer capacitors can be processed easily and accurately without being interfered by the module box.

  In the first invention, the connection between the electric double layer capacitors is made by connecting the terminals on the junction side to invert the electric double layer capacitor to the stacking position after joining the flanges of the terminals of different polarities to each other. Since the flange comes to the inside of the terminal by bending in steps, the height dimension including the terminal joint between the capacitor cells can be kept small. Further, since the terminal is bent after joining the flanges, rather than joining the flanges inside the terminals, the joining of the flanges coming inside the terminals can be processed easily and accurately. Also, if the flanges of different polarities are set in contact with each other in a vertical plane between the laminated electric double layer capacitor and the laminated electric double layer capacitor, the flanges are joined by a fixed welding machine. It becomes easy to maintain stable quality.

  In the second invention, as in the first invention, since the flange does not protrude outward as in the prior art, the height dimension including the junction of the terminals between the capacitor cells can be kept small. In this case, by bending the terminal after joining, there is no flange on the inside of the terminal, so the length of the terminal itself can be set shorter than in the first invention. Moreover, between the electric double layer capacitor to be laminated and the electric double layer capacitor to be laminated, if the tip end sides of the terminals of different polarities are set to contact each other on a horizontal plane, the terminals are fixed by a fixed welding machine. This makes it easy to maintain a stable quality.

  An electric double layer capacitor module according to an embodiment of the present invention will be described based on the drawings.

  1 to 3, 1 is an electric double layer capacitor (capacitor cell), 10 is a module box, and a plurality of capacitor cells are accommodated inside the box 10. The plurality of capacitor cells 1 are assembled in a single stacked state and sandwiched between the front and rear end plates 11 and 12. On the front side of the stacked capacitor cell 1, a spring receiver 13 is fixed to the rear surface of the end plate 11, and an intermediate plate 15 is disposed adjacent to the foremost capacitor cell 1, and between the spring receiver 13 and the intermediate plate 15. A spring 14 is interposed between the two. Bands 16 and 17 are hung between the front and rear end plates 11 and 12, and both ends of the bands 16 and 17 are fastened to the front end plate 11 via screws 18. As a result, the predetermined number of capacitor cells 1 are compressed to a predetermined surface pressure by the spring 14 between the middle plate 15 and the rear end plate 12, and the internal resistance performance of each piece is enhanced.

  Reference numeral 20 denotes a bottom plate of the box 10, 21 denotes a side cover of the box 10, and the pair of side covers 21 are erected so as to surround the bottom plate 20 from both sides and are screwed together with the front and rear end plates 11 and 12 via screws 23. Are attached to the bottom plate 20. The parallel monitor board 30 is attached to the pair of side covers 21 so as to block the upper part of the box 10, and grommets 34 and 35 for inserting cables 31 and 32 extending from the parallel monitor board 30 are arranged on the side cover 21. . Brackets 36 and 37 are attached to the upper portions of the front and rear end plates 11 and 12, and terminals 38 and 39 (box terminals) protruding above the box 10 are attached to the brackets 36 and 37. In the box 10, an insulating material is disposed at a necessary position between the components.

  When the voltage of the capacitor cell 1 reaches a predetermined value, the parallel monitor substrate 30 includes an electronic component that operates so as to suppress a further increase in the voltage of the capacitor cell 1. FIG. 4 shows wiring between the parallel monitor substrate 30 and each capacitor cell. A circular hole (insertion hole) is formed in the top surface portion of each terminal 3 (portion parallel to the stacking direction of the capacitor cell 1). The cable 50 extending from the parallel monitor board 30 is connected to the corresponding terminal 3 through the insertion portion into the circular hole.

  FIG. 5 exemplifies the configuration of the capacitor cell 1, and reference numeral 1 a denotes a laminated body composed by alternately stacking a plurality of positive electrode bodies and negative electrode bodies with separators interposed therebetween. Is a container for sealing the laminated body 1a together with the electrolytic solution, and 3 (3a, 3b) is a pair of terminals (cell terminals) arranged outside the container 2. A positive electrode body and a negative electrode body are comprised in flat form from the collector electrode and the polarizable electrode formed in the both surfaces. These collector electrodes are made of a rectangular metal foil (for example, an aluminum foil), and a strip-like lead 4 (4a, 4b) is integrally formed on one side of the rectangle so that the same poles of the leads 4 are bound together. The The pair of terminals 3 is formed of a metal plate (for example, an aluminum plate) and is joined to a binding portion of the lead 3 having a corresponding polarity. Reference numeral 5 denotes a joint portion between the terminal 3 and the lead 4.

  The container 2 is composed of two container members (a bottom member and a lid member) formed from a flexible laminated film including a metal intermediate layer in a plurality of resin layers. A housing portion for the laminated body 1a is formed between the cover member and the lid side member. The laminated body 1a is housed inside the lid-side member, and the lid-side member is placed thereon. At the peripheral edge 2a of the container 2, the three sides excluding the one side from which a part of the pair of terminals (metal plates) 3a, 3b is drawn are sealed. The container 2 can be opened on one side from which the pair of terminals 3a and 3b protrudes, and the electrolyte is injected into the inside from the opening, and after a predetermined treatment (electrolytic activation, etc.) is completed, the remaining one side is sealed. .

  In such a method of manufacturing a capacitor module composed of a plurality of capacitor cells 1, a process of assembling a plurality of capacitor cells one by one into a stacked state while connecting the capacitor cells one by one in series. A step of receiving the assembled capacitor cell 1 in the module box 10. FIG. 6 illustrates a process of associating a plurality of capacitor cells one by one in series while being connected in series, and in a stage before entering the processes (a) to (e). For each piece of the capacitor cell 1, one end side of the pair of terminals 3 is bent in a normal direction at a substantially right angle to form a flange 40 a, while the other end side of the pair of terminals 3 is bent in a reverse direction at a substantially right angle. The process of forming the flange 40b is performed.

  In (a), two flanges 40a and 40b of different polarities are brought into contact with each other and joined to each other for the first capacitor cell (1-1) and the second capacitor cell (1-2). In (b), one side of the terminal 3 on the joining side is bent at a substantially right angle at a part away from the flange 40a by a predetermined distance. In (c), the other of the terminals on the joining side is bent at a substantially right angle at a part away from the flange 4b by a predetermined distance. By these bending processes, the second capacitor cell (1-2) is inverted and overlapped with the first capacitor cell (1-1) in a stacked state.

  In (d), the flange 40a in which the second capacitor cell (1-2) remains for two of the stacked second capacitor cell (1-2) and third capacitor cell (1-3). The third capacitor cell (1-3) has one flange 40b opposite to each other but joined to each other and joined to the second capacitor cell (1-2). ) To invert the third electric double layer capacitor (1-3) so that it overlaps the stacked state, the terminal of the second capacitor cell (1-2) is bent at a substantially right angle at a position away from the flange 40a by a predetermined distance. . Next, the terminal on the joint side of the third capacitor cell (1-3) is bent at a substantially right angle at a portion away from the flange 4b by a predetermined distance. By repeating this for the fourth and subsequent capacitor cells (1-4) to (1-n), four or more capacitor cells (1-4) to (1-n) are connected in series one by one. However, it is assembled in a single-layered state. In (e), the band 42 for temporary fixing is wound around and the integrated body 41 of the capacitor cells 1 is tightened to prepare for the storage in the box 10.

  In the integrated body 41, the capacitor cells (1-1) and (1-n) at both ends are left in a non-bonded state with the positive terminal 3a on the one hand and the negative terminal 3b on the other hand (see FIG. 4). ). The terminals 3a and 3b are bent at a right angle at a portion away from the flanges 40a and 40b by a predetermined distance, and connected to the box terminal 38.39 via the flanges 40a and 40b on the front end side (see FIGS. 1 to 3). .

  According to such a manufacturing method, the plurality of capacitor cells 1 are assembled in a single-layer stacked state while being connected one by one in series prior to mounting in the module box 10. Can be processed easily and accurately without interfering with the box 10.

  In the process of FIG. 6, the connection between the capacitor cells 1 is made by joining the flanges 40a and 40b of the terminals of different polarities to join each other, and then joining the terminal 3a on the joining side to invert the capacitor cell 1 to the stacking position. , 3b is bent in two steps so that the flanges 40a, 40b come inside the terminals 3a, 3b as shown in FIG. 8 (2), so that the height dimension including the junction of the terminals 3 between the capacitor cells 1 is included. Can be kept small. In this case, since the terminals 3a and 3b are bent after the joining of the flanges 40a and 40b, rather than joining the flanges 40a and 40b inside the terminals 3a and 3b, the joining of the flanges 40a and 40b inside the terminals 3a and 3b is performed. It can be processed easily and accurately.

  When the flanges 40a and 40b of different polarities are in contact with each other in a vertical plane between the capacitor cell 1 to be stacked and the capacitor cell 1 to be stacked, a fixed welding machine (the welding arm is in the x-axis direction) The welding of the flanges 40a and 40b is stable by using a welding machine that is fixed to the Y axis and movable only in the y-axis direction. Easy to maintain. In (d), reference numeral 51 denotes a dummy cell having the same thickness as the capacitor cell 1, and the number of stacked dummy cells 52 is increased as the number of capacitor cells 1 (left side in the figure) in the stacked state increases, whereby the flanges 40a, 40b. Can be easily matched without any step. Instead of increasing the number of dummy cells 51, the number of stacked dummy cells 51 on which the first capacitor cell (1-1) is placed on the top may be decreased one by one as the number of capacitor cells 1 in the stacked state increases. .

  FIG. 7 explains another step (step of associating a plurality of capacitor cells one by one in series while stacking them one by one) in place of the step of FIG. Unlike the case of FIG. 6, the capacitor cell (see FIG. 5) in which the flanges 40 a and 40 b are not formed on the tip end side of the pair of terminals 3 is used as it is.

  In (A), the first capacitor cell (1-1) and the second capacitor cell (1-2) are joined to each other by overlapping the tips of the terminals 3a and 3b of different polarities. To do. In (B), one side 3a of the terminal 3 on the joining side is bent at a substantially right angle at a part away from the joining part 53 by a predetermined distance. In (C), the other side 3b of the terminal 3 on the joining side is bent at a substantially right angle at a portion away from the joining portion 53 by a predetermined distance. By these bending processes, the second capacitor cell (1-2) is inverted and overlapped with the first capacitor cell (1-1) in a stacked state. In (A), the negative electrode side (or positive electrode side) of the second capacitor cell (1-2) is placed on the positive electrode side (or negative electrode side) terminal 3a of the first capacitor cell (1-1). The terminal 3b of the second capacitor cell (1-2) is placed under the terminal on the negative electrode side (or positive electrode side) of the first capacitor cell (1-2), while the terminal 3b of the second capacitor cell (1-2) is overlapped. By overlapping the terminals 3a, the bending process (B) is not hindered by interference between terminals on the non-joining side.

  In (D), the remaining terminal 3a of the second capacitor cell (1-2) for two of the second capacitor cell (1-2) and the third capacitor cell (1-3) in the stacked state. The tip side of one terminal 3b, which is the opposite pole of the third capacitor cell (1-3), is overlapped and joined to the tip side of the third capacitor cell (1-3). In order to invert the third electric double layer capacitor (1-3) so that the capacitor cell (1-3) of the first layer overlaps the stacked state, one side 3a of the junction side terminal 3 is separated from the junction 51 by a predetermined distance. Bend it at a right angle. Next, the other side 3 b of the terminal 3 on the joining side is bent at a substantially right angle at a part away from the joining part 51 by a predetermined distance. By repeating this for the fourth and subsequent capacitor cells, four or more capacitor cells are assembled in a single-layer stacked state while being connected one by one in series. In (e), the band for temporary fixing is wound around and the integrated body of these capacitor cells is tightened to prepare for housing in the box.

  In the integrated body 43, the capacitor cells (1-1) and (1-n) at both ends are left in a non-bonded state with the positive terminal 3a on the one hand and the negative terminal 3b on the other hand. The terminals 3a and 3b are connected to the box terminal 38.39 through the flanges 40a and 40b on the front end side by bending in two stages. A circular hole (insertion hole) is formed in a top surface portion (a portion parallel to the stacking direction of the capacitor cell 1) including the joint portion 51 of each terminal 3, and a cable 50 extending from the parallel monitor substrate 30 corresponds to the corresponding terminal 3a, 3b. It is connected via the insertion part to the circular hole.

  7, the terminals 3 are connected as shown in FIG. 8 (3), and the flanges 60 a and 60 b do not protrude outward as in the conventional case. The height dimension including the joint portion of the terminal 3 can be kept small. In this case, by bending the terminal 3 after joining, there is no flange 40a, 40b that comes inside the terminal, so the length of the terminal 3 itself can be set shorter than in the case of FIG. Further, between the capacitor cell 1 to be stacked and the capacitor cell 1 to be stacked, if a relationship is established in which the tip sides of the terminals 3a and 3b having different polarities are in contact with each other on a horizontal plane, a fixed welding machine (welding) This is a welding machine with an arm fixed in the x-axis direction and movable only in the y-axis direction. Unlike TIG welding, it does not require heat preparation time, and spot welding or ultrasonic welding is desirable. It becomes easy to maintain the quality.

It is sectional drawing of the capacitor module which concerns on embodiment of this invention. Similarly, it is an arrow view of FIG. It is an exploded perspective view similarly. It is also a wiring diagram. It is explanatory drawing which similarly concerns on the structure of an electrical double layer capacitor. It is process drawing explaining the manufacturing method of a capacitor module similarly. It is another process drawing explaining the manufacturing method of a capacitor module. It is a comparison figure explaining the capacitor module concerning an embodiment of this invention. It is explanatory drawing which concerns on the conventional capacitor module.

Explanation of symbols

1 Electric double layer capacitor (capacitor cell)
3 (3a, 3b) Terminal 10 Module box 14 Pressure spring 30 Parallel monitor board 40a, 40b Flange 51 Terminal joint 41, 43 Integrated body 42 Band

Claims (2)

  In a method of manufacturing a capacitor module composed of a plurality of electric double layer capacitors, a step of associating a plurality of electric double layer capacitors one by one in series while connecting them one by one in series, and assembling the plurality into one set The step of assembling the electric double layer capacitors into a module box, and connecting the plurality of electric double layer capacitors one by one in series to form a stacked state in a row. For each of the double-layer capacitors, forming a flange by bending one tip side of a pair of terminals in the forward direction while forming a flange by bending the other tip side of the pair of terminals in the reverse direction; For two of the first electric double layer capacitor and the second electric double layer capacitor, one pair of terminals of different polarity of the pair of terminals of the electric double layer capacitor is provided. The first electric double layer capacitor and the second electric double layer capacitor are overlapped with each other so that the second electric double layer capacitor is inverted so that the second electric double layer capacitor is inverted in two stages, For two of the second electric double layer capacitor and the third electric double layer capacitor in the stacked state, a pair of the third electric double layer capacitor is set against the flange of the remaining terminal of the second electric double layer capacitor. In order to invert the third electric double layer capacitor so that the third electric double layer capacitor overlaps with the second electric double layer capacitor in a laminated state by superimposing the flanges of the different polarities of the terminals and joining them together. By bending the terminal on the junction side in two stages and repeating this, a plurality of electric double layer capacitors are connected in series one by one, Method of manufacturing an electric double layer capacitor module comprising: the step of assembling the layer state, the.   In a method of manufacturing a capacitor module composed of a plurality of electric double layer capacitors, a step of associating a plurality of electric double layer capacitors one by one in series while connecting them one by one in series, and assembling the plurality into one set The step of assembling the electric double layer capacitors into a module box, the step of assembling a plurality of electric double layer capacitors one by one in series while being connected in series is the first step. For two of the electric double layer capacitor and the second electric double layer capacitor, the different polarities of a pair of terminals are overlapped and one of them is joined to each other, and the second electric capacitor is connected to the first electric double layer capacitor. In order to invert the second electric double layer capacitor so that the double layer capacitor overlaps the laminated state, the terminal on the junction side is folded in two steps, and the second layer in the laminated state For two of the electric double layer capacitor and the third electric double layer capacitor, different polarities of the pair of terminals of the third electric double layer capacitor with respect to the front end side of the remaining terminal of the second electric double layer capacitor The terminals on the junction side are reversed so as to invert the third electric double layer capacitor so that the third electric double layer capacitor is stacked on the second electric double layer capacitor. The electric double layer capacitor module is characterized by comprising a step of assembling a plurality of electric double layer capacitors in series in one row while connecting each of the electric double layer capacitors in series by bending the capacitor in two stages. Method.

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