JP2014229681A - Power storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage unit superior in productivity.SOLUTION: In the power storage unit, a holder which supports a power storage device has a support means that supports a connection member. The connection member supported by the support means has: at least two supports abutted on the support means of the holder; and a connection part which is electrically connected with the power storage device between the supports. At least a part of the outer surface of the connection member is exposed from the holder. With this arrangement, in the power storage unit, since the connection member can be easily mounted to the holder, the productivity is increased. When the connection member is connected to the power storage device, since positional displacement of the connection member and connection failure are prevented, and thus the reliability of connection is increased.

Description

  The present invention relates to a power storage unit used in various electronic devices, in-vehicle power storage devices, and the like.

  Up to now, power storage units that can be charged and discharged have been used as main power sources, auxiliary power sources, standby power sources, and the like of electronic devices.

  FIG. 8 is a perspective view partially showing a capacitor unit in which a plurality of capacitors are electrically connected as an example of a conventional power storage unit.

  The conventional capacitor unit is composed of a plurality of capacitor blocks 100, each of which is a plurality of columnar capacitors 101 arranged in parallel, and an upper holder that is supported by upper and lower ends of the capacitors 101 arranged in parallel. 102 and the lower holder 103 and the internal bus bar 104 that electrically connects the adjacent capacitors 101 among the plurality of capacitors 101 arranged side by side with the electrode 105, and the plurality of capacitors 101 arranged side by side. A plate-like lead electrode 106 electrically connected to the capacitor located at the end of the direction, an external bus bar 107 for electrically connecting the lead electrodes 106 and electrically connecting the capacitor blocks 100, and the above Screw 108 for fixing the extraction electrode 106 and the external bus bar 107 It is al configuration.

  In the conventional capacitor unit, when the lead electrode 106 and the external bus bar 107 are fixed with the screws 108, the contact surfaces of the lead electrode 106 and the external bus bar 107 are respectively provided with irregularities, and when stress is applied with the screws 108, Concavities and convexities provided on both contact surfaces are fitted to each other, so that the extraction electrode 106 and the external bus bar 107 can be more firmly fixed, and the resistance between the extraction electrode 106 and the external bus bar 107 can be lowered. .

  As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.

JP 2008-204985 A

  Certainly, the configuration of the conventional power storage unit (capacitor unit) makes it possible to more firmly connect the capacitor blocks.

  However, power storage units tend to have a large number of parts required for assembly, and a certain amount of time is required until the assembly is completed. Therefore, in order to increase productivity, it is necessary to improve work efficiency during assembly.

  Accordingly, an object of the present invention is to provide a power storage unit that is simplified in assembly and improved in productivity.

  In order to solve the above problems, a power storage unit according to the present invention includes a plurality of power storage devices arranged in parallel, a holder that supports the plurality of power storage devices, and a plate-like connection member that electrically connects the power storage devices. The holder includes support means for supporting the connection member, and the support means supports the connection member with both ends sandwiched therebetween. The connection member supported by the support means includes support means for the holder. A pair of supporting portions in contact with each other and a connecting portion electrically connected to the power storage device are provided between the pair of supporting portions.

  With this configuration, in particular, the power storage unit of the present invention can simplify the assembly of the power storage device, the holder, and the connection member, and can improve productivity and reliability.

  This is because the connection member is individually supported by the holder in advance, and therefore it is not necessary to separately connect the connection member and the power storage device when connecting the power storage device and the connection member, so that the connection is easy. It is because it becomes. Further, by supporting the connection member supported by the holder by applying stress from both ends, it is possible to prevent the connection member from being fixed in an unstable state such as tilting on or in the holder.

The perspective view which opened the unit case of the electrical storage unit in the Example of this invention, and also showed the structure inside a unit case. The perspective view which decomposed | disassembled and showed the electrical storage apparatus, the upper and lower holder, and a connection member which are used for the electrical storage unit in the Example of this invention. The exploded perspective view which extracted and showed the electrical storage apparatus used for the electrical storage unit in the Example of this invention, a connection member, an insulating sheet, and a base. (A) The perspective view which extracted and showed the support means of the holder used for the electrical storage unit in the Example of this invention partially, (b) The perspective which extracted and showed the other support means of the holder partially Figure Schematic cross-sectional view partially showing a state in which a connection member used in the power storage unit in the embodiment of the present invention is attached to the upper holder The perspective view which showed the connection member used for the electrical storage unit in the Example of this invention (A) Front cross-sectional image showing partially extracted before the power storage unit manufactured in the embodiment of the present invention is pressed by a jig in the pressing step of the flattening step, (b) Front cross-sectional image showing a partial excerpt after being pressed by a jig in the pressing process The perspective view which extracted and showed the structure of the conventional electrical storage unit partially

  Hereinafter, examples of the present invention and inventions according to all claims will be described with reference to the drawings, but the scope of the present invention is not limited to the following contents.

(Example)
FIG. 1 is an exploded perspective view showing a state in which a unit cover 10 is removed from an electricity storage unit according to an embodiment of the present invention.

  As shown in FIG. 1, the power storage unit of the present invention includes a plurality of columnar power storage devices 1 arranged in the vicinity of upper and lower ends of the power storage devices 1 arranged side by side. The holder 2 and the holder 3 housed and supported inside, the support members 4a and 4b electrically supported by the power storage devices 1 and fixed to the holders 2 and 3 and fixed to the holders 2 and 3; The wiring connection portion 5 electrically connected to the connection members 4a and 4b, the wiring connection portion 5 having one end electrically connected to the connection members 4a and 4b, and the wiring 6 and the other end electrically connected to each other. A control board 7, a pair of external connection terminals 8 connected to the connection member 4b, a pedestal 9 attached to the holder 3, the power storage device 1, the holders 2, 3, the connection members 4a, 4b, the wiring connection portion 5, Wiring 6, Your substrate 7, the external connection terminal 8 (hereinafter, these are collectively referred to as "power storage unit") is constructed from unit cover 10 which houses with pedestal 9.

  FIG. 2 is an exploded perspective view showing the power storage device 1, the holders 2, 3 and the connection members 4a, 4b used in the power storage unit of the present embodiment.

  An electric double layer capacitor is used for the power storage device 1 of the present embodiment. As shown in FIG. 2, each power storage device 1 has a capacitor element (not shown) that stores and feeds power, an exterior case 1a that accommodates the capacitor element, and a part of the exterior from the opening of the exterior case 1a to the outside. It has the collected current collecting terminal 1b and a sealing member 1c provided at the opening of the outer case 1a so as to be interposed between the outer peripheral surface of the current collecting terminal 1b and the inner peripheral surface of the outer case 1a. The outer case 1a and the current collecting terminal 1b are made of a conductive material. The capacitor element has a positive electrode and a negative electrode. One of the pair of electrodes is electrically connected to the outer case 1a, and the other electrode is electrically connected to the current collecting terminal 1b. With this configuration, the power storage device 1 is configured to draw out the respective electrodes from opposite directions of the upper end side of the current collecting terminal 1b and the lower surface side (bottom surface side) of the exterior case 1a. A plurality of power storage devices 1 according to the present embodiment are used. For example, six power storage devices 1 are arranged in one row, and three rows are arranged in parallel.

  The holders 2 and 3 are provided on the upper side and the lower side in the height direction of the power storage device 1 with respect to the group of the plurality of power storage devices 1 arranged in parallel. 1 and 2, a holder 2 is provided on the upper side of the power storage device 1, and a holder 3 is provided on the lower side.

  In FIG. 2, the holders 2 and 3 of this embodiment are made of resin as an example. The holders 2 and 3 are configured by holes, and the support portions 2a and 3a for storing the plurality of power storage devices 1 in the holes, and the support holes 2e for inserting the support columns 11 connected to the holders 2 and 3; 3e. A plurality of accommodating portions 2a, 3a of the present embodiment are formed in accordance with the plurality of power storage devices 1, and are provided so that the holes of the accommodating portion 2a and the holes of the accommodating portion 3a face each other. The support column 11 is inserted into the support column holes 2 e and 3 e of the holders 2 and 3, and the support column 11 is supported by the holders 2 and 3, whereby the holders 2 and 3 support each other through the support column 11. Yes.

  The connection members 4 a and 4 b are made of metal and are respectively disposed on the upper surface of the holder 2 drawn from both ends of the power storage device 1 or the bottom surface of the holder 3. The connecting members 4a and 4b include a shaft portion 4e extending to one side, a tongue-shaped connection portion 4f extending from the shaft portion 4e, a pair of crank portions 4h respectively connected to both ends of the shaft portion 4e, It is comprised from the support parts 4c and 4d connected with the crank part 4h. And it is electrically connected with the electrical storage apparatus 1 in the connection part 4f. As an example, the connection member 4a of the present embodiment is configured such that two adjacent power storage devices 1 in each row are connected in series to the power storage devices 1 arranged in parallel by 3 rows × 6 pieces / row. Three adjacent power storage devices 1 are connected in parallel, and are electrically connected to a total of six power storage devices 1. Connection member 4b is connected to power storage devices 1 located at both ends of each row. The connection members 4a and 4b of the present embodiment are provided with a first support portion 4c and a second support portion 4d at both ends. These support portions 4c and 4d are configured to be supported by the first support means 2b and the second support means 2c provided on the side surface portions, like the holder 2 in FIG. Details of the support methods of the support portions 4c and 4d and the support means 2b and 2c will be described later.

  As shown in FIG. 1, the wiring connection portion 5 is provided at a place where the support means 2 b is formed, and connection members 4 a and 4 b electrically connected to the power storage device 1 and terminals (not shown) provided at one end of the wiring 6. Are electrically connected. As an example, the wiring connection portion 5 of the present embodiment fixes and connects the terminals of the wiring 6 and the connection members 4a and 4b by screwing.

  As shown in FIG. 1, the wiring 6 uses a copper wire having terminals at both ends as an example, and is connected to the connection members 4a and 4b at the wiring connection portion 5 at one end and to the control board 7 at the other end. ing.

  As shown in FIGS. 1 and 2, the control board 7 is electrically connected to the connection members 4 a and 4 b via the wiring 6. With this configuration, the control board 7 detects the charge / discharge states and voltage states of the plurality of power storage devices 1 and controls that the degree of deterioration of each power storage device 1 is biased. The control board 7 is attached to a board fixing portion 3j provided in the holder 3.

  The external connection terminal 8 is made of a conductive material and is provided in a pair of positive and negative. As shown in FIG. 1, the external connection terminal is electrically connected to the connection member 4 b on the flange portion 2 d provided on the holder 2. The external connection terminal 8 has a role of electrically connecting the power storage device 1 and an external device or an external circuit provided outside the power storage unit of the present embodiment via the connection members 4a and 4b.

  FIG. 3 is an exploded perspective view showing the power storage device 1, the connecting members 4 a and 4 b, the insulating sheet 12, and the base 9 extracted from the power storage unit.

  The pedestal 9 is made of a plate-shaped metal material. As shown in FIG. 1, the pedestal 9 fixes the power storage unit to the pedestal 9 by attaching the holder 3. When fixing, as shown in FIG. 3, the outer surface of the connection member 4 a provided on the holder 3 side comes into contact with the pedestal 9, so that the thermal conductivity is excellent between the connection member 4 a and the pedestal 9. The power storage unit is fixed to the pedestal 9 with the insulating sheet 12 interposed. At this time, the pedestal fixing portion 3f provided on the holder 3 and having a protrusion protruding toward the pedestal 9 is inserted into the mounting hole 9c, and the pedestal fixing portion 3d of the holder 3 and the mounting hole 9b of the pedestal 9 are screwed. Is fixed.

  The unit cover 10 is made of resin, and as shown in FIG. 1, an upper surface portion having end sides in four directions, a side surface portion extending from the end side portions of the upper surface portion, and formed in four directions, and a lower end of the side surface portion. Has an opening located on the surface. The unit cover 10 accommodates the power storage unit into the unit cover 10 through the opening and is attached to the base 9. At the time of this attachment, the side part formed in the above four directions has four corners in the opening of the unit cover 10, and each of the four corners is formed with a recess, and the end of the recess on the opening side has a flange. A pedestal fixing portion 10b is provided, and the pedestal fixing portion 10b and the mounting hole 9a of the pedestal 9 are fixed by screws. Further, the unit cover 10 of the present embodiment is provided with a terminal insertion hole 10a which is a through hole for inserting the pair of external connection terminals 8 on the upper surface portion. The external connection terminal 8 is inserted into the terminal insertion hole 10a, and one end thereof is exposed from the inside of the unit cover 10 to the outside.

  The power storage unit of the present embodiment is composed of the above components.

  The power storage unit of the present invention has support means for supporting the connection member by the holder, like the holder 2 and connection members 4a and 4b in FIGS. 1 and 2, and the connection member supported by the support means is supported. A pair of support portions in contact with the means, and a connection portion electrically connected to the power storage device between the pair of support portions, and at least a part of the outer surface of the connection member is exposed from the holder. It is characterized by that.

  With this configuration, the power storage unit of the present invention can improve productivity and reliability at the time of manufacture, particularly when the power storage device 1, the holders 2, 3, and the connection members 4a, 4b are assembled. This is because the connection members 4a and 4b are fixed by the holders 2 and 3 before being connected to the power storage device 1, so that when the power storage device 1 and the connection members 4a and 4b are connected, they are not fixed again. However, this is because the positioning of the connection members 4a and 4b with respect to the power storage device 1 is facilitated. Thereby, it can suppress connecting member 4a, 4b with the electrical storage apparatus 1 in an unstable state, and can suppress generation | occurrence | production of the stress in a connection defect and an unnecessary connection interface. Furthermore, since the support portions 4c and 4d are provided so as to sandwich the connection portion 4f of the connection members 4a and 4b, the connection members 4a and 4b can be compared with the configuration in which the support portion is provided without sandwiching the connection portion. It can be more firmly fixed against external stress applied.

  FIGS. 4A and 4B are perspective views partially showing the support means 2b and 2c provided on the holder 2 of the present embodiment. FIG. 5 is a schematic cross-sectional view partially showing a method for supporting the connection member 4b in the holder 2 of the present embodiment. FIG. 6 is a perspective view showing the connection members 4a and 4b of the present embodiment.

  Thereafter, when describing the configuration of the holders 2 and 3 of the present embodiment, the description may be made using only the holder 2 in order to avoid duplication of explanation. 3 can also be applied.

  The support means 2b, 2c of the present embodiment is, as an example, a mounting portion 2j that is provided on each of the opposing side surfaces of the holder, protrudes from the side surface, and has an upper surface that contacts the lower surfaces of the support portions 4c, 4d. The wall portion 2k extends from one end of the placement portion 2j and is erected so that the side surface of the holder 2 faces one surface.

  As shown in FIG. 4 (a), the support means 2b and 2c of the present embodiment are at least partially flexible among the portions abutting on the support portions 4c and 4d in order to support the connection members 4a and 4b. It is preferable to have. In the present embodiment, as an example, the wall portion 2m of the support means 2c is supported by the mounting portion 2j only at one end, and the other end (the tip of the wall portion 2k) is not supported. The wall portion 2m of the support means 2c having a cantilever shape is made flexible. With this configuration, the structure of the support means 2b and 2c can be further simplified, and the method of attaching the connection members 4a and 4b to the holder 2 can be simplified. This is because, when attaching the connection members 4a and 4b to the holder 2, the holder 2 and the connection members 4a and 4b can be attached using only this configuration without providing a fixing means such as a screw. It is.

  At this time, the wall 2m of the support means 2c of the present embodiment has a cantilever-like structure in order to further improve the workability during assembly, and a slope 2h is formed at the unsupported tip portion of the structure. Has been. The slope 2h is formed on the inner surface of the support means 2c. With this configuration, when the tip of the support portion 4d is brought into contact with the inclined surface 2h to bend the wall portion 2m, the bent portion 2h is bent to a lower portion of the wall portion 2m as compared with the configuration in which the inclined surface 2h is not formed. The resistance when entering is reduced. Thereby, workability | operativity at the time of attaching connecting member 4a, 4b to the holder 2 can be improved. Furthermore, the inclined surface 2h is preferably formed partially on the inner surface side of the tip of the support means 2c. This is because the adjacent portion where the slope 2h is not formed serves as a side wall adjacent to the slope 2h, and the support portion 4d can be guided into the support means 2c.

  In order to more firmly fix the support portion 4d in the support means 2c, the wall portion 2m of the support means 2c of the present embodiment is inserted so that a part of the connection portion 4d can be accommodated under the portion where the slope 2h is formed. The fitting part 2f which is a hole is provided. This is because the wall portion 2m of the support means 2c can function as a snap fit, and the support portion 4d and the wall portion 2m are engaged with each other. Further, the fitting portion 2f has the same width as the width of the support portion 4d or almost no dimensional difference, so that the support portion 4d is the holder 2 in the hole of the fitting portion 2f. It is preferable because the fluctuation in the horizontal direction and the vertical direction is more firmly fixed with respect to the upper surface.

  Further, the power storage unit of the present embodiment preferably has a configuration in which stress is applied to the connection members 4a and 4b from two directions when the support means 2b and 2c support the connection members 4a and 4b. This is because, when the connection members 4a and 4b are to be fixed on the holder 2, this structure can be fixed more firmly.

  At this time, it is preferable that the two directions of applied stress are opposite to each other. The support means 2b and 2c of the present embodiment are supported by applying stress in opposite directions toward the inside of the connection members 4a and 4b. However, the present invention is not limited to this configuration, and a configuration in which stresses are applied in directions away from each other may be supported. In the case of supporting in this way, a configuration in which a hole is provided in each support portion of the connection member and the support means is inserted into the opposing hole and fitted is preferable.

  Furthermore, the support means 2b and 2c of the present embodiment are configured such that the support means 2b and 2c have different flexibility in order to support the connection members 4a and 4b. Specifically, the flexibility of the wall portion 2m of the support means 2c of this embodiment is increased, and the flexibility of the wall portion 2k of the support means 2b is made lower than the flexibility of the wall portion 2m of the support means 2c. It has a configuration with increased rigidity. With this configuration, the support means 2b and 2c can more firmly fix the connecting members 4a and 4b after being attached, and workability when attaching the connecting members 4a and 4b is improved. This is a mechanism in which the wall portions 2k and 2m of the support means 2b and 2c are both flexible. Further, when the bending direction is the same direction, the support means 2b and 2c are connected by the support means 2b and 2c. Even after the members 4a and 4b are fixed, when the stress in the bending direction is received from the outside, one of these wall portions 2k and 2m tends to be displaced and the connecting members 4a and 4b may move. There is. On the other hand, since the support means 2b of this embodiment increases the rigidity of the wall portion 2k with which the tip of the support portion 4c abuts, the support means 2b does not bend, so that the connecting members 4a and 4b can be changed. Can be reduced, which is preferable.

  As shown in FIG. 4B, the supporting means 2b of the present embodiment has a fitting portion 2f that is a hole in the wall portion 2k so that the supporting portion 4c can be inserted to fix the supporting portion 4c. Is provided. Thereby, it has the function which regulates the fluctuation | variation of the horizontal direction of a connection member 4a, 4b and an up-down direction with the fitting part 2f of the support means 2c.

  FIG. 5 is a schematic cross-sectional view partially showing a state in which the connection member used in the power storage unit in this embodiment is attached to the upper holder.

  Below, the attachment method of the connection member with respect to the holder in the electrical storage unit of a present Example is demonstrated using the holder 2 and the connection member 4b.

  As shown in FIG. 5, when the connecting members 4a and 4b are attached to the holders 2 and 3, the power storage unit according to the present embodiment fixes the support 4c to the support 2b as an example, and then attaches the support 4d to the support 2c. Install in the procedure of fixing.

  This is a state where the support portion 4c is temporarily fixed to the fitting portion 2f of the wall portion 2k of the rigid support means 2b, and the connection member 4b whose one end is temporarily fixed is connected to the support portion 4d. Defeat as you do. By tilting the connecting member 4b, the support portion 4d contacting the slope 2h at the tip of the wall portion 2m of the support means 2c descends below the slope 2h while bending the wall portion 2m. Is fitted into the fitting portion 2f. When both are fitted to the fitting portions 2f of the wall portions 2k, 2m, the bottom surfaces of the support portions 4c, 4d are opposed to the top surfaces of the mounting portions 2j of the support means 2b, 2c, or the support portions 4c, 4d. The bottom surface of this is in contact with the top surface of the mounting portion 2j.

  Compared to a structure in which at least two support portions 4c and 4d are individually sandwiched and supported by performing such an attachment method, the power storage unit of the present embodiment is substantially sandwiched and supported at one place. Therefore, the structure can be simplified. Further, in this attachment method, since the support means 2b and 2c are bent by attaching stress to the support portions 4c and 4d and the connection members 4a and 4b, the attachment can be performed only once, so that the support portions are individually sandwiched and fixed. Compared to the structure, the work is simplified and the productivity can be improved.

  Furthermore, the power storage unit of the present embodiment preferably has a configuration in which the height of the support portions 4c and 4d and the height of the shaft portion 4e are different as in the connection member 4b of FIG. This is because the shaft 4e may be warped depending on how the stress is applied, particularly when the supporting means 2c and 2d support the connecting members 4a and 4b by applying stress so as to sandwich the connecting members 4a and 4b from both ends. Thus, it is possible to suppress the stress from the support means 2b and 2c from being applied to the shaft portion 4e. As shown in FIG. 5, the power storage unit of the present embodiment provides a height difference in the holder 2 such that the upper surface of each mounting portion 2j is lower than the upper surface of the housing portion 2a. A stepped wall 2g, which is a part of the side wall of the holder 2, is interposed between 2a and 2a. In accordance with the shape of the stepped wall 2g, there is a crank portion 4h connected between the support portions 4c and 4d of the connection member 4b and the shaft portion 4e. The surface of the crank portion 4h that is erected with respect to the support portions 4c and 4d faces the stepped wall 2g. With this configuration, a reaction force is generated from the step wall 2g to the crank portion 4h with respect to the stress applied from the support portions 4c and 4d, and the stress from the support portions 4c and 4d is directly applied to the shaft portion 4e. . It is preferable that the step wall 2g is further provided with a groove on the surface in contact with the crank portion 4h, and the crank portion 4h is accommodated in the groove. With this configuration, the positioning of the connection members 4a and 4b in the holders 2 and 3 can be facilitated, and situations such as the connection members 4a and 4b placed on the holders 2 and 3 being twisted can be suppressed.

  As described above, the power storage unit of the present embodiment has a structure in which the connection members 4a and 4b can be attached to the holders 2 and 3 from the outside.

  FIG. 6 is a perspective view showing the connection members 4a and 4b of the present embodiment. The connecting members 4a and 4b of the present embodiment include a shaft portion 4e extending in one direction and having a longitudinal direction, and extending from the shaft portion 4e and extending in a direction perpendicular to the longitudinal direction of the shaft portion 4e. It is composed of a certain connecting portion 4f, a pair of crank portions 4h each having one end connected to the shaft portion 4e at both ends in the longitudinal direction, and support portions 4c and 4d respectively connected to the other ends of the pair of crank portions 4h. The connection member 4b further includes an external connection portion 4g extending in the direction opposite to the connection portion 4f in order to connect to the external connection terminal 8 on the flange portion 2d of the holder 2. The crank portion 4h is formed to bend so as to form a step portion that goes down together with the shaft portion 4e and the support portions 4c and 4d.

  In this configuration, the connection portion 4 f which is a plate-like tongue piece portion whose one end is connected to the shaft portion 4 e extends in a substantially horizontal direction with respect to the upper surface of the holder 2 and the lower surface of the holder 3. This connection part 4f has flexibility. With this configuration, when each of the connection portions 4f is connected to the power storage devices 1 arranged in parallel, even if there is an error in the height of the connection location of each power storage device 1 due to a dimensional error of each power storage device 1, the error The connection members 4a and 4b can positively contact the power storage device 1 by bending the connection portion 4f by the amount. Thereby, the connection failure of connection member 4a, 4b and the electrical storage apparatus 1 can be suppressed.

  Furthermore, the power storage unit of the present invention increases the efficiency of exhaust heat from the power storage unit by connecting the connection members 4a and 4b to the power storage device 1 with the connection members 4a and 4b fixed to the holders 2 and 3 in advance. be able to. This is because the connection members 4a and 4b are fixed to the holders 2 and 3 and the power storage device 1 is accommodated in the holders 2 and 3 and then connected to the power storage device 1 before the connection members 4a and 4b are connected to the power storage device 1. It is possible to add a process of flattening the outer surfaces of the connecting members 4a and 4b (hereinafter referred to as “flattening step”) while the members 4a and 4b are in contact with each other. This is because good contact with the heat dissipating member having the above can be maintained.

  7 (a) and 7 (b) are front views partially showing before and after the power storage device 1 is pressed by the jig 20 in the pressing step of the flattening step of the power storage unit manufactured in this embodiment. It is a cross-sectional image figure.

  The flattening process will be described below. In the power storage unit of this embodiment, since the connection members 4a and 4b are provided separately above and below the power storage unit, the connection members are arranged on the upper and lower sides. It classifies and explains. (Hereinafter, the two types of connection members are referred to as “upper connection member” and “lower connection member”). Of these two types of connection members, the connection member provided on the lower side is the insulating sheet 12. Since the power storage unit of this embodiment is in contact with the lower connection member, the lower connection member has a smaller variation in height difference between the connection portions 4f than the upper connection member, and is flat.

  The flattening step performed in manufacturing the power storage unit of the present invention is performed in such a manner that the connection portion 4f of the lower connection member positively contacts the outer case 1a and the current collecting terminal 1b of the power storage device 1. The pressing process of pressing the portion 4f and the power storage device 1 from both sides in the opposite direction, and the electrical storage device 1 and the connecting portion 4f of the lower connection member positively abutting after the pressing process are electrically and mechanically At least a connecting step of connecting to the.

  In the pressing step, as an example, the upper and lower connecting members and the power storage device 1 are pushed using a jig 20 that has an upper lid 20a and a lower lid 20b and can be fixed so as to be sandwiched from above and below. At this time, in this jig 20, it is preferable that the abutting portion with the lower connecting member of the lower lid 20b and the abutting portion with the upper connecting member of the upper lid 20a are pushed with different structures. More specifically, the contact surface of the lower lid 20b is flush with the lower connection members, and the contact portion of the upper cover 20a is the same as that of the upper connection members. It is preferable to be configured to be able to contact the connection portion 4f at an individual height. With this configuration, the variation in the distance between the power storage device 1 and the lower connection member, which occurred before the first pressing step, can be reduced by connecting the power storage device 1 to the lower connection member by the contact portion of the upper lid 20a. The lower connection member brings the contact interfaces with the power storage device 1 close to the same plane and the contact interfaces with the lower lid 20b. Can be close to the state. Thereby, the height of the outer surface of each lower connection member approaches the same position. As a result, the height of the outer surface of each lower connection member is the same position, and each connection member can abut on the insulating sheet 12 under more uniform conditions. The bias of exhaust heat can be suppressed.

  In the connection step, the connection portion 4f and the power storage device 1 are connected with the height of the outer surface of the lower connection member determined in the pressing step. The power storage unit of this embodiment uses welded bonding as an example of a connection method. However, the connection method in the power storage unit of the present invention is not limited to this.

  Following the flattening step, the power storage unit of the present embodiment connects the connection portion 4f of the upper connecting member and the power storage device 1. At this time, the variation in the distance between each upper connection member and each power storage device 1 is the difference in the distance between the lower connection member and the power storage device 1 that occurred before the pressing step. It becomes a state added to the dispersion | variation in the distance between an upper connection member and the electrical storage apparatus 1. FIG. In order to perform the flattening process in this way, the holders 2 and 3 used in the power storage unit of the present embodiment are subjected to a pressing process when a predetermined stress is applied to the power storage device 1 that is supported from the outside. A configuration in which the power storage device 1 can be moved by the accommodating portions 2a and 3a of the holders 2 and 3 is preferable. As an example, as illustrated in FIG. 2, a configuration in which an elastic portion 3 k that contacts the inner peripheral surfaces of the housing portions 2 a and 3 a while applying a predetermined stress to the side surface of the power storage device 1 is provided. With this configuration, the power storage device 1 can be supported while applying a predetermined stress, and at the same time, the stress applied and the direction in which the stress is applied are different in the pressing step, so that the power storage device 1 can be moved. In addition, the electrical storage unit of a present Example should just be that the electrical storage apparatus 1 can move within the holders 2 and 3 at least in the said planarization process. For this reason, the power storage device 1 is more firmly supported in the holders 2 and 3 in a state where the outer surface of the lower connection member in contact with the insulating sheet 12 is flattened through the flattening step. Also good. Further, in order to more easily contact the insulating sheet 12, the surface of the lower connecting member of this embodiment that contacts the insulating sheet 12 is positioned below (outside) the outer surface of the lower surface of the holder 3. It is preferable.

  The power storage device used in the power storage unit of the present invention is not limited to a capacitor such as an electric double layer capacitor, and may be a battery such as a lithium ion secondary battery, a nickel hydrogen battery, or a lead storage battery. The shape of the outer case 1a is not limited to a cylindrical shape as in this embodiment, and may be a square shape. In addition, the power storage device of the present embodiment has a configuration in which the positive and negative electrodes are respectively drawn from the upside down direction, and accordingly the connection members 4a and 4b are arranged up and down, but is not limited thereto, The positive and negative electrodes of the power storage device 1 may both be drawn out from the same direction, and the connection members may be arranged on one side.

  In the power storage unit of the present invention, the power storage device and the connection member are supported in a state where the connection member is previously supported by the holder. Thereby, the productivity at the time of connection and the reliability of a unit can be improved. As a result, it is expected to be used in in-vehicle or electronic devices where high reliability is required.

DESCRIPTION OF SYMBOLS 1 Power storage device 1a Exterior case 1b Current collecting terminal 1c Sealing member 2, 3 Holder 2a, 3a Housing part 2b, 2c Supporting means 2d Gutter part 2e, 3e Post hole 2g Step wall 2f Fitting part 2h Slope 2j Mounting part 2k, 2m Wall portion 3d, 3f, 10b Base fixing portion 3j Substrate fixing portion 3k Elastic portion 4a, 4b Connection member 4c, 4d Support portion 4e Shaft portion 4f Connection portion 4g External connection portion 4h Crank portion 5 Wiring connection portion 6 Wiring 7 Control board 8 External connection terminal 9 Base 9a, 9b, 9c Mounting hole 10 Unit cover 10a Terminal insertion hole 11 Post 12 Insulating sheet

Claims (12)

A plurality of power storage devices arranged in parallel;
A holder for supporting the plurality of power storage devices,
And at least a plate-like connecting member that electrically connects the power storage devices,
The holder has support means for supporting the connection member,
The connection member supported by the support means has at least two support portions that are in contact with the support means, and a connection portion that is electrically connected to the power storage device between the support portions, and at least a part thereof. The electricity storage unit with the outer surface of the battery exposed from the holder. 2. The power storage unit according to claim 1, wherein at least a part of a portion of the support means that contacts the support portion of the connection member contacts the support portion has flexibility. The power storage unit according to claim 2, wherein a hole into which at least a part of the support part of the connection member is inserted is provided in a part of the support part having flexibility. Of the at least two support portions, a part of the support means that comes into contact with one support portion is the portion having the flexibility, and one of the support means that comes into contact with the other support portion. The power storage unit according to claim 2, wherein the portion is less flexible than the portion having flexibility. The power storage unit according to claim 2, wherein the portion of the support means that comes into contact with the other support portion has a hole into which at least a part of the other support portion is inserted. 5. The power storage unit according to claim 4, wherein the holder has a facing surface facing the support means of the holder between the two supporting portions, and a part of a plane of the connecting member is opposed to the facing surface. The connection member has a connection portion electrically connected to the power storage device between the two support portions,
The power storage unit according to claim 1, wherein the support portion and the connection portion have different heights. The one support means has a snap fit portion that comes into contact with the connection member, the other support means comes into contact with the other end of both ends of the connection member, and the one contact portion is a snap fit portion. The power storage unit according to claim 4, wherein the other contact portion has a through hole or a recess into which a part of one end of the connection member is inserted. The connection member includes a shaft portion connected to the support portion, and a plate-like tongue piece portion formed to extend from the shaft portion, and the tongue piece portion is a connection portion of the connection member. The electricity storage unit according to 1. The power storage unit according to claim 9, wherein a height of a connection surface of the tongue piece portion with the power storage device is different from a height of a lower surface of the shaft portion. A pedestal fixed together with the holder is provided,
A plurality of the connection members are provided, and the plurality of connection members are respectively disposed on both ends of the power storage device in one direction, and are provided on one side of the connection members provided on both sides of the power storage device. The outer surface exposed from the holder of the connecting member is flatter than the outer surface exposed from the holder of the connecting member provided on the other side, and the outer surface of the connecting member provided on the one side is the pedestal. The power storage unit according to claim 1, which faces The power storage unit according to claim 1, wherein a connection portion of the connection member is welded to the power storage device.

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