JP2020009582A - Connection module and power storage module - Google Patents

Abstract

To provide a connection module which has secured a wiring space for an electric wire while suppressing an increase in size.SOLUTION: Disclosed is a connection module 30 which is assembled to a storage element group 20 in which a plurality of storage elements 21 each having an electrode terminal 25 are configured by being arranged side by side. The connection module 30 includes: a plurality of bus bars 40 to which the electrode terminals 25 of the storage element 21 are connected; a plurality of voltage detection lines EW connected to the plurality of bus bars 40, respectively; and a plate-shaped holding member 80 for holding the plurality of bus bars 40 and the plurality of voltage detection lines EW. The holding member 80 includes: a bus bar holding surface 80U on which the plurality of bus bars are held; and an element facing surface 80D opposite to the storage element group 20. On the device facing surface 80D, an electric wire route 110 is provided, in which the plurality of voltage detection lines EW are arranged.SELECTED DRAWING: Figure 3

Description

  The technology disclosed in this specification relates to a connection module and a power storage module.

  For example, as a high-voltage detection module device attached to a battery pack main body composed of a plurality of battery cells, a device described in Japanese Patent Application Laid-Open No. 2010-114025 (Patent Document 1) is known. This high-voltage detection module device holds a plurality of bus bars connecting battery cells, a flat cable having a plurality of conductor wires for detecting voltages of the plurality of bus bars, and a plurality of bus bars and a flat cable. And an insulating frame that is assembled to the battery pack body. The plurality of bus bars are arranged and fixed on the upper surface of the insulating frame, and the flat cable has a plurality of conductor wires connected to each bus bar, respectively, and the area other than the bus bar arrangement region on the upper surface of the insulating frame. Is fixed.

JP 2010-114025 A

  By the way, in recent years, since the size of the entire battery pack has been reduced, unlike the above-described high-voltage detection module device, an electric wire for detecting the voltage of the bus bar is arranged on the upper surface of the holding member that holds the bus bar. Space is decreasing. Further, when the number of bus bars increases, the number of electric wires for connecting to the bus bars also increases, so that it becomes impossible to secure a space for arranging the electric wires.

  The present specification discloses a technique for securing a wiring space for electric wires while suppressing an increase in the size of the connection module.

  The technology disclosed by this specification is a connection module that is assembled to a power storage element group in which a plurality of power storage elements having electrode terminals are arranged side by side, and a plurality of bus bars to which the electrode terminals of the power storage elements are connected. A plurality of electric wires respectively connected to the plurality of bus bars, and a plate-like holding member for holding the plurality of bus bars and the plurality of electric wires, and one surface of the holding member is held by the plurality of bus bars. The other surface of the holding member opposite to the one surface is an element facing surface facing the power storage element group, and the element facing surface includes the plurality of busbar holding surfaces. The configuration is such that an electric wire routing path for the electric wires is provided.

  Further, the technology disclosed in this specification is a power storage module including a power storage element group in which a plurality of power storage elements having electrode terminals are arranged side by side, and a connection module assembled to the power storage element group. A plurality of bus bars to which the electrode terminals of the storage element are connected, a plurality of electric wires respectively connected to the plurality of bus bars, and a plate-like holding member for holding the plurality of bus bars and the plurality of electric wires, One surface of the holding member is a bus bar holding surface on which the plurality of bus bars are held, and the other surface opposite to the one surface of the holding member is an element facing surface facing the power storage element group. The electric wire routing path on which the plurality of electric wires are arranged is provided on the element facing surface.

  According to the connection module and the power storage module having such a configuration, since the wire routing path for routing a plurality of wires is provided on the element facing surface of the holding member, the wires are routed on the bus bar holding surface of the holding member. Even in a case where space cannot be secured, it is possible to secure a space for arranging electric wires while suppressing an increase in the size of the connection module.

The connection module disclosed in the present specification may have the following configuration.
The electric wire routing path is open to the power storage element group side, and the plurality of electric wires are connected to the bus bar holding surface and the bus bar through a side wiring path opened laterally at a side portion of the holding member. It is good also as a structure wired between the element facing surfaces.

For example, in the case of a round hole-shaped side wiring route that is provided so as not to have an opening on the side with respect to the holding member, the wires are pre-arranged to the holding member, for example, by leading the wires. You need to find them.
However, according to the above configuration, it is possible to easily perform the operation of arranging the electric wires on the holding member. Also, since the electric wires can be assembled to the routing path after the bus bars are assembled in the holding member, the assembling workability is excellent.

  At the opening edge of the side routing path, a regulating portion is formed, which is formed to protrude in a direction intersecting the opening direction and abuts on the electric wire to regulate the electric wire from protruding from the side routing path. Configuration.

  When arranging a plurality of electric wires on the side wiring route provided on the side of the plate-shaped holding member, each wire is bent at a steep angle, and the side wiring route is caused by the reaction force of the wires. There is a concern that the wires may protrude from the cable. However, according to the above configuration, since the restricting portion is provided at the opening edge of the side wiring path, it is possible to suppress the electric wire from protruding from the opening of the side wiring path.

The side wiring path is provided on both side edges of the holding member.
According to such a configuration, the electric wire connected to the bus bar arranged on one side in the holding member can be routed to the electric wire routing path through the one side routing path, and is arranged on the other side in the holding member. The electric wire connected to the bus bar can be routed to the electric wire routing route through the other side routing route. That is, since the wiring space for the electric wires routed on the bus bar holding surface can be reduced as much as possible, it is possible to further suppress an increase in the size of the connection module.

  In the bus bar, the electrode terminals of the adjacent power storage elements are arranged and connected along the side edge of the bus bar, and the electric wire routing path is one of the plurality of bus bars in the holding member. May be provided on the back side of a portion where the bus bar is disposed.

  In the holding member, the back side of the portion where the bus bar to which the electrode terminals of the adjacent power storage elements are connected is disposed as a dead space in the holding member. However, according to the above configuration, since the wire routing path is provided in an area that would otherwise be a dead space (behind the portion where the bus bar is disposed), the connection module is routed while the wires are routed. Can be prevented from increasing in size.

  The wire routing path is provided with a small-diameter routing path on which some of the plurality of wires are routed, and wider than the narrow routing path, and together with some of the wires. And a wide wiring portion in which the extra length of the other electric wire among the plurality of electric wires is arranged.

  In general, a predetermined wire length (minimum wire length) needs to be secured in order to expose the core wire by stripping the sheath at the end of the wire whose core wire is covered with the sheath. However, when the minimum wire length is secured, the wire length may be longer than required for the holding member. However, according to the above configuration, since the electric wire routing path has a wide wiring portion that can route the extra length of the electric wire, the extra length of the electric wire is routed on the bus bar holding surface of the holding member. This can prevent the connection module from increasing in size.

  The power storage element includes an element main body in which the power storage element is wrapped with a resin film and joined to an edge, an electrode terminal derived from one end of the element main body, and the film and the electrode at an edge of the element main body. The electric wire routing may be configured to be disposed between the joints of the adjacent power storage devices in the power storage device group.

  In the case where a joint is provided at a portion where the electrode terminal is led out at the edge of the element body of the power storage element, a dead space is originally created between the joints of adjacent power storage elements. However, according to the above configuration, an electric wire routing path is provided between the joining portions of the adjacent power storage elements. That is, since the electric wire routing path is provided in a region that would otherwise be a dead space, it is possible to suppress an increase in the size of the connection module while routing the electric wires.

  ADVANTAGE OF THE INVENTION According to the technique disclosed by this specification, the wiring space of an electric wire can be ensured, suppressing that a connection module enlarges.

Perspective view of a power storage module Top view of power storage module FIG. 2 is a sectional view taken along line AA of FIG. 2. Perspective view of connection module assembled with battery management board A perspective view showing a state where the connection module is turned upside down. Bottom view of connection module Top view of holding member Bottom view of holding member

<Embodiment>
One embodiment of the technology disclosed in the present specification will be described with reference to FIGS.
The present embodiment exemplifies a low-voltage power storage module 10 for starting an engine mounted on a vehicle. The power storage module 10 includes a power storage element group 20 including a plurality of power storage elements 21, a connection module 30 that is assembled to the power storage element group 20, and the power storage element group 20 housed therein and the connection module 30 fixed to an upper portion. And a case C.

  The electric storage element 21 is a laminated battery, and is configured as a flat rectangular parallelepiped as a whole. As shown in FIG. 3, each power storage element 21 is connected to an element main body 24 in which the power storage element 22 is wrapped with a synthetic resin laminate film 23 and the edges of the laminate film 23 are joined by welding, and the power storage element 22. And a pair of electrode terminals 25 extending upward from an upper end edge which is one end edge of the element main body 24. Each of the pair of electrode terminals 25 is formed in a foil shape, and as shown in FIGS. 1, 2 and 3, one is a positive electrode terminal 25P and the other is a negative electrode terminal 25N.

Further, a portion where the upper end edge of the laminate film 23 is disposed in each electrode terminal 25 is a joining portion 26 where the electrode terminal 25 and the laminate film 23 are welded as shown in FIG.
The joint 26 is formed upright on the upper surface of the power storage element 22, and the height of the joint 26 is set to be larger than the length of the electrode terminal 25 extending from the upper surface of the joint 26. Have been.

  In addition, as shown in FIG. 3, a plurality of (four in the present embodiment) power storage elements 21 are stacked and arranged in the front-rear direction such that the electrode terminals 25 are adjacent to each other, as shown in FIG. 3. The adjacent power storage elements 21 have electrode terminals 25 of different polarities adjacent to each other (the positive electrode terminal 25P of one power storage element 21 and the negative electrode terminal 25N of another power storage element 21 adjacent thereto are adjacent to each other). So) is arranged.

  The case C is made of a synthetic resin, and is formed in a box shape opening upward as shown in FIG. In the case C, the power storage element group 20 is completely accommodated from the upper end opening, and the connection module 30 closes the upper end opening of the case C in which the power storage element group 20 is accommodated as shown in FIGS. It is assembled to case C so as to close it.

  As shown in FIGS. 1 to 8, the connection module 30 is generally longer in the left-right direction than in the front-rear direction, and includes a plurality of bus bars 40 connected to the electrode terminals 25 of the power storage element 21 and a plurality of bus bars 40. And a holding member 80 that holds the plurality of bus bars 40 and the plurality of voltage detection lines W.

  The bus bar 40 is formed by, for example, pressing a metal plate having excellent conductivity, such as copper, a copper alloy, aluminum, an aluminum alloy, and stainless steel (SUS), or a metal plate obtained by bonding an aluminum plate and a copper plate. It is formed.

  The plurality of bus bars 40 include a plurality of connection bus bars 50 connecting the electrode terminals 25 of the adjacent storage elements 21 and a plurality of output bus bars connected to the electrode terminals 25 of the storage elements 21 and outputting the power of the storage element group 20. 60. In the present embodiment, the connection bus bar 50 is formed of a so-called clad material composed of an aluminum plate and a copper plate, and a metal plate is selected for the output bus bar 60 according to the output polarity.

  As shown in FIG. 1 and FIG. 2, the connection bus bar 50 includes two components disposed on the right side, which is one side of the connection module 30, and one component disposed at a substantially central portion in the front-rear direction on the other side, which is the left side. It is located at the place. The connection bus bar 50 arranged on the right side is a connection bus bar 50 connecting the right electrode terminals 25 of the adjacent storage elements 21, and the connection bus bar 50 arranged on the left side is the left electrode terminal 25 of the storage element 21. The connection bus bar 50 connects the two.

  Each connection bus bar 50 has a bus bar main body 51 having a long and substantially rectangular flat plate shape. The electrode terminals 25 of the power storage elements 21 adjacent to each other in the front and rear direction are provided on both side edges of the bus bar main body 51 in the front and rear direction. Are mounted from above and are electrically connected by welding or the like. At both ends in the left-right direction of the bus bar main body 51, a locking projection 52 protruding outward and a locking concave portion 53 provided in the bus bar main body 51 in a concave shape are provided.

Further, at one end in the left-right direction of each connection bus bar 50, an electric wire connection portion 54 to which the voltage detection wire W is connected is provided as shown in FIG.
The electric wire connection portion 54 has an electric wire mounting portion 55 on which the terminal of the voltage detection wire W is mounted, and a crimp portion 56 to which a coating W2 of the voltage detection wire W described below is crimped.

  The electric wire mounting portion 55 has a form protruding from the bus bar main body 51 of the connection bus bar 50 toward the side in a substantially rectangular flat plate shape, and a crimp portion 56 is provided at a protruding end of the electric wire mounting portion 55. . The core wire W1 of the voltage detection wire W, which will be described later, is mounted on the electric wire mounting portion 55 in a state where the core wire W1 is exposed. Thus, the voltage detection line W is maintained in a state of being electrically connected to the connection bus bar 50.

  As shown in FIGS. 1 and 2, the output bus bars 60 are arranged at two positions on both left and right ends in the front-rear direction of the connection module 30. The output bus bar 60 is longer in the left-right direction than the connection bus bar 50, and is provided at both ends in the left-right direction of the output bus bar 60 with a locking projection 62 protruding outward and a concave shape. Locking recess 63 is provided.

  The front output bus bar 60 has a front fastening portion 64 extending to the right side of the connection bus bar 50, so that the front output bus bar 60 is long in the left-right direction. A portion of the front output bus bar 60 on the left side of the front fastening portion 64 is a bus bar main body 61, and the electrode terminals 25 of the power storage element 21 are placed on the front edge of the bus bar main body 61 from above and are electrically connected by welding or the like. The connection is made.

  The rear output bus bar 60 has a rear fastening portion 65 extending to the left side of the connection bus bar 50, so that the rear output bus bar 60 is long in the left-right direction. A portion on the right side of the rear fastening portion 65 of the rear output bus bar 60 is a bus bar main body 61, and the electrode terminal 25 of the power storage element 21 is placed on the rear edge of the bus bar main body 61 from above and welded. It is electrically connected by such as.

  Further, as shown in FIG. 2, two voltage detection lines W can be connected to a side edge of the bus bar main body 61 in each output bus bar 60. A covering crimping portion 66 is provided on a side edge of a portion of the bus bar main body 61 to which the voltage detection line W is connected.

  The core wires W1 of the two voltage detection wires W are mounted on the side edges of the bus bar main body 61 in a state where the core wires W1 are exposed, and the coating W2 is collectively crimped by the coating crimping portion 66, and the core wire W1 is attached to the bus bar main body 61. By connecting to the side edges by welding or the like, the two voltage detection lines W are held in a state of being electrically connected to the output bus bar 60.

  As shown in FIG. 2, the voltage detection line W has a form in which a core wire W1 having excellent conductivity is covered with a coating W2 having an insulating property. Each of the voltage detection lines W has one end connected to the electric wire connection portion 54 of the connection bus bar 50 or the bus bar main body 61 of the output bus bar 60, and the other end connected to the connector CN at the upper left side of the holding member 80. Connected to the battery management board P via Thereby, the voltage of the power storage element 21 is taken into the battery management board P through each bus bar 40, and the voltage of each power storage element 21 can be detected.

  The holding member 80 is made of a synthetic resin and has a somewhat rectangular shape with a relatively large thickness as shown in FIGS. One surface (front surface) of the front and back surfaces of the holding member 80 is a bus bar holding surface 80U that holds the plurality of bus bars 40, and the other surface (back surface) opposite to the bus bar holding surface 80U is An element facing surface 80 </ b> D is provided to face the storage element group 20.

The bus bar holding surface 80U is provided with a plurality of connection bus bar holding portions 82 for holding the connection bus bars 50 and a plurality of output bus bar holding portions 90 for holding the output bus bars 60.
In the present embodiment, two connection bus bar holding portions 82 are arranged in parallel in the front-rear direction on the right side, which is one side (the right side in FIG. 2) of the holding member 80 in the left-right direction. One connecting bus bar holding portion 82 is provided at a substantially central portion on the left side in the front-rear direction on the other side (left side in FIG. 2) of the central portion in the left-right direction.

  Further, two output bus bar holding portions 90 are arranged in the front-rear direction on both sides in the front-rear direction of the left connection bus bar holding portion 82 of the holding member 80.

As shown in FIGS. 2 and 6, the connection bus bar holding portion 82 includes a bus bar mounting portion 83 on which the connection bus bar 50 is mounted, and a pair of insertion holes 84 provided on both front and rear sides of the bus bar mounting portion 83. A bus bar receiving portion 85 that locks with the locking projection 52 of the connection bus bar 50; and a bus bar fitting piece 86 that locks with the edge of the locking recess 53 of the connection bus bar 50.
The busbar mounting portion 83 has a substantially rectangular shape in plan view, and the front, rear, left, and right lengths of the busbar mounting portion 83 are set to be substantially the same as the front, rear, left, and right lengths of the connection busbar 50.

  Each of the pair of insertion holes 84 is formed so as to penetrate the holding member 80 in the vertical direction which is the plate thickness direction, and is formed along the front and rear side edges of the bus bar mounting portion 83. When the connection module 30 is assembled to the case C, the electrode terminals 25 of the power storage element group 20 arranged in the case C are inserted into the insertion holes 84 from below. As shown in FIGS. 1 and 2, the electrode terminal 25 inserted into the insertion hole 84 is bent toward the connection bus bar 50, placed on the bus bar main body 51, and connected to the bus bar main body 51 of each connection bus bar 50. ing.

  That is, the connection bus bar 50 in which the right electrode terminals 25 of the two power storage elements 21 from the front of the power storage element group 20 are arranged on the right front, and the left and right side of the second and third power storage elements 21 from the front of the power storage element group 20. By connecting the connection bus bar 50 in which the electrode terminal 25 is disposed on the left side to the connection bus bar 50 disposed in the right rear of the two power storage elements 21 after the power storage element group 20, the power storage element All the storage elements 21 in the group 20 are connected in series.

  When all the storage elements 21 are connected in series, each of the front output bus bar 60 and the rear output bus bar 60 outputs an output bus bar that outputs either the positive or negative power of the storage element group 20. It will be 60.

  The bus bar receiving portion 85 has a form projecting upward from the bus bar holding surface 80U of the holding member 80. When the connection bus bar 50 is placed on the bus bar receiving portion 83, the bus bar receiving portion 85 fits into the bus bar receiving portion 85 from the side of the bus bar receiving portion 83 when the locking projection 52 of the connection bus bar 50 is fitted. The locking projection 52 of the connection bus bar 50 is locked.

  The bus bar fitting piece 86 has a form rising from the bus bar holding surface 80U of the holding member 80. When the connection bus bar 50 is mounted on the bus bar mounting portion 83, the bus bar fitting piece 86 is fitted into the locking recess 53 of the connection bus bar 50, thereby forming an edge of the locking recess 53 of the connection bus bar 50. To prevent the connection bus bar 50 from being detached from the connection bus bar holding portion 82 together with the bus bar receiving portion 85. Thereby, the connection bus bar 50 is held by the holding member 80.

  As shown in FIG. 2, the output bus bar holding portion 90 includes an output bus bar mounting portion 91 on which the bus bar main body 61 of the output bus bar 60 is mounted, and a pair of output bus bar mounting portions 91 provided on both front and rear sides of the output bus bar mounting portion 91. The bus bar includes a through hole 92, a bus bar receiving portion 93 that locks with the locking projection 62 of the output bus bar 60, and a bus bar fitting piece 94 that locks with the edge of the locking recess 63 of the output bus bar 60. Although the output bus bar holding portion 90 has the output bus bar mounting portion 91 formed to be larger in the left-right direction than the connection bus bar holding portion 82, the other portions have substantially the same configuration as the connection bus bar holding portion 82. The description is omitted.

As shown in FIG. 2, a fuse 70 is attached to a substantially central portion of the holding member 80 in the left-right direction.
The fuse 70 includes a fuse body 71 having a substantially rectangular shape in a plan view, a pair of lead portions 72 provided on both side surfaces of the fuse body 71 in the front-rear direction, and a control lead portion 73 provided on a right side surface of the fuse body 71. It is provided with.

  When the current flowing between the pair of lead portions 72 becomes equal to or higher than the rating, the fuse body 71 melts the internal metal and cuts off the current between the pair of lead portions 72. Further, the fuse main body 71 is configured such that when the control lead portion 73 is heated, the internal metal is melted and the current between the pair of lead portions 72 is cut off.

  Each of the pair of lead portions 72 is formed in a flat plate shape, one of which is screwed to the front fastening portion 64 of the front output bus bar 60, and the other is screwed to the rear fastening portion 65 of the rear output bus bar 60. It has been stopped.

  The control lead portion 73 is formed in a flat plate shape, and the control lead portion 73 is screwed to the round terminal T of the control line L connected to the battery management board P via the connector CN to control the battery. Connected to the use substrate P. Then, when the control lead portion 73 is heated from the battery management board P through the control line L, the metal inside the fuse body 71 is melted and the current between the pair of lead portions 72 is cut off. .

  Now, as shown in FIGS. 3, 5, and 6, the holding member 80 has a pair of voltage detection lines W and control lines L between the bus bar holding surface 80U and the element facing surface 80D. A side wiring path 100 is provided, and a voltage detection line W and a control line L guided to the element facing surface 80D through the side wiring path 100 are mounted on the element facing surface 80D of the holding member 80. An electric wire routing path 110 to be routed on the facing surface 80D is provided.

  As shown in FIGS. 3, 5, 6, and 8, the pair of side wiring paths 100 are provided at side edges of the holding member 80 in the left-right direction. Each of the side wiring paths 100 has a form in which the holding member 80 opens to the bus bar holding surface 80U and the element facing surface 80D and opens sideways. In other words, as shown in FIG. 7, each side routing path 100 has a form in which a side edge in the left-right direction of the holding member 80 is cut out in a substantially U-shape.

  As shown in FIGS. 2 and 6, the side wiring path 100 disposed on the right side includes two voltage detection lines W extending from the connection bus bar 50 disposed on the right side of the holding member 80 and control of the fuse 70. A right wiring path 100R for routing a total of three electric wires EW of the control lines L extending from the lead portion 73 from the bus bar holding surface 80U of the holding member 80 toward the element facing surface 80D side. A regulation piece (a "regulation portion") that regulates the three wires EW disposed in the right-side routing path 100R from protruding to the side by abutting the side opening edge 101 of the routing path 100R. One example) 102 is provided.

  The restricting piece 102 has a form projecting from the front side opening edge 101F toward the rear side opening edge 101R (front and rear direction which is a direction intersecting with the opening direction). The distance between the end and the rear side opening edge opposed to each other is set smaller than the outer diameter of each electric wire EW.

  On the other hand, the side routing path 100 disposed on the left side is wider than the right routing path 100R in the front-rear direction, and the connection bus bars 50 and 2 disposed on the left side of the holding member 80. The five voltage detection lines W extending from the two output bus bars 60 are routed from the bus bar holding surface 80U of the holding member 80 toward the element facing surface 80D, and the five voltage detection lines W turned back on the element facing surface 80D. A left side wiring path 100L for wiring the detection line W again to the bus bar holding surface 80U is provided. Further, the left wiring path 100L routes the two voltage detection lines W and the control lines L disposed on the element facing surface 80D side through the right wiring path 100R toward the bus bar holding surface 80U.

  That is, substantially 13 electric wires EW are routed in the left side wiring route 100L. The plurality of voltage detection lines W and the control lines L routed on the bus bar holding surface 80U through the left side wiring path 100L are connected to the battery management board P through the connector CN arranged on the upper left side of the holding member 80. Have been.

A pair of restricting pieces 105 for restricting the thirteen wires EW disposed in the left side wiring path 100L from protruding to the side by abutting on the side opening edge 104 of the left side wiring path 100L. Is provided.
The pair of restriction pieces 105 project from the side opening edges 104 located on both sides in the front-rear direction toward the front-rear direction, which is a direction intersecting the opening direction, so as to face each other. The distance between them is set smaller than the outer diameter of each electric wire EW.

  As shown in FIGS. 5, 6 and 8, the wire routing path 110 extends linearly over the entire width of the holding member 80 in the left-right direction at a substantially central portion in the front-rear direction on the element facing surface 80 </ b> D of the holding member 80. Is formed. Then, when the connection module 30 is assembled to the power storage element group 20, the electric wire routing path 110 is arranged between the joining portions 26 of the adjacent power storage elements 21 as shown in FIG. 3.

  As shown in FIGS. 5, 6, and 8, the wire routing path 110 is a narrow routing path provided from a substantially central portion in the left-right direction of the holding member 80 to a right end portion of the holding member 80. 111 and a wide wiring path 115 formed from the left end of the narrow wiring path 111 to the left end of the holding member 80.

  The narrow wiring path 111 is formed in an inverted U-shape that opens to the power storage element group 20 side by a pair of long side walls 112, a part of which is substantially missing in the left-right direction, and a holding member 80 (element facing surface 80D). In the narrow routing path 111, a total of three voltage detection lines W and one control line L routed on the element facing surface 80D side through the right routing path 100R. Are arranged.

  The pair of long side walls 112 extend from the element facing surface 80 </ b> D toward the power storage element group 20 so as to oppose each other in the front-rear direction, and hold two connection busbars disposed on the right side of the holding member 80. It is configured to extend in the left-right direction between the portions 82 (between the insertion holes 84 near the center in the front-rear direction of each connection bus bar holding portion 82). At the protruding end portions of the pair of long side walls 112, there are provided a plurality of wires that restrict the three wires EW routed in the narrow routing path 111 from protruding from the narrow routing path 111 to the power storage element group 20 side. A regulating piece 113 is provided.

  The plurality of restricting pieces 113 are provided on a long side wall 112 located at the right rear of the narrow routing path 111 and a long side wall 112 located at the left front, and each restricting piece 113 projects from the opposing long side wall 112. It is configured to protrude toward the end. That is, the restriction pieces 113 in the narrow routing path 111 are provided alternately in the front-back direction. In addition, the distance between the protruding end of the regulating piece 113 and the long side wall 112 opposed thereto is set smaller than the outer diameter of each electric wire EW.

  On the other hand, the wide wiring path 115 is formed to be wider in the front-rear direction than the narrow wiring path 111, and a pair of short side walls 116 extending in the left-right direction and the holding member 80 (the element facing surface 80D). This forms an inverted U-shape opening toward the storage element group 20 side. Five voltage detection lines W guided to the element facing surface 80D side through the left side wiring path 100L are introduced into the wide wiring path 115, and the five voltage detection lines W introduced into the wide wiring path 115 are provided. The voltage detection line W is bent at the right end of the wide wiring path 115 and led to the left wiring path 100L. In the wide wiring route 115, two voltage detection lines W and one control line L introduced from the narrow wiring route 111 are routed toward the left wiring route 100L. .

  In other words, the wide wiring path 115 accommodates the remaining lengths of the five voltage detection lines W connected to the three bus bars 40 arranged on the left side of the holding member 80, so that substantially 13 electric wires EW are accommodated. Is arranged.

  The pair of short side walls 116 extend from element facing surface 80D toward power storage element group 20 so as to be parallel in the front-rear direction. In addition, the pair of short side walls 116 are arranged between the pair of insertion holes 84 of the connection bus bar holding portion 82 arranged on the left side of the holding member 80. That is, the wide wiring path 115 of the electric wire wiring path 110 is provided on the back side of the bus bar mounting portion 83 on which the connection bus bar 50 is mounted.

  In addition, a partition wall 117 extending from the element facing surface 80 </ b> D toward the power storage element group 20 is provided between the pair of short side walls 116. The partition wall 117 functions as a guide when folding the five voltage detection lines W introduced into the wide wiring path 115 from the left wiring path 100L, and detects five voltage detection lines in the wide wiring path 115. The entanglement of the line W can be suppressed.

  Also, at the protruding end portions of the pair of short side walls 116, a pair of members that regulate substantially 13 electric wires EW routed in the wide wiring path 115 from protruding from the wide wiring path 115 to the power storage element group 20 side. Are provided. The pair of restriction pieces 118 are provided at substantially the center in the left-right direction of the pair of short side walls 116. The pair of restriction pieces 118 project in the front-rear direction so as to face each other, and the distance between the protruding ends of the pair of restriction pieces 118 is set smaller than the outer diameter of each electric wire EW.

The present embodiment is configured as described above. Next, the operation and effects of the connection module 30 will be described.
In recent years, downsizing of a low-voltage power storage module for starting an engine mounted on a vehicle is being studied due to an increase in devices mounted in an engine room. For this reason, miniaturization of the connection module that holds the bus bar in the power storage module is also required, and it is difficult to secure a space for arranging wires on the bus bar holding surface that holds the bus bar in the connection module.

  However, according to the present embodiment, as shown in FIGS. 2 to 6, a plurality of voltage detection lines W are provided on the element facing surface 80D which is the back side of the bus bar holding surface 80U holding the plurality of bus bars 40 in the holding member 80. And a control line L are provided. Further, a pair of side wiring paths 100 for arranging the plurality of voltage detection lines W and the control lines L between the bus bar holding surface 80U and the element facing surface 80D are provided on the side of the holding member 80. ing.

  That is, the pair of side wiring paths 100 are provided on the side of the holding member 80, and the wire wiring paths 110 for wiring the plurality of wires EW are provided on the element facing surface 80D of the holding member 80. Even when it is not possible to secure a space for arranging the plurality of electric wires EW on the bus bar holding surface 80U of 80, it is possible to secure a space for arranging the plurality of electric wires EW while suppressing an increase in the size of the connection module 30. .

  By the way, as in the present embodiment, the space between the junctions 26 of the adjacent power storage elements 21 originally becomes a dead space. Further, as in the present embodiment, the back side of the bus bar mounting portion 83 of the connection bus bar 50 in which the electrode terminals 25 of the adjacent power storage elements 21 are arranged along the side edges and connected by welding or the like, is originally. If there is, it becomes dead space.

  However, according to the present embodiment, as shown in FIG. 3, since the wire routing paths 110 are provided in these areas that would otherwise be dead spaces, it is possible to suppress the connection module 30 from increasing in size. The plurality of electric wires EW can be routed on the element facing surface 80D side.

  As shown in FIGS. 6 and 8, the pair of side wiring paths 100 are formed so as to open laterally on the side of the holding member 80. That is, for example, in the case of a round hole-shaped side wiring route provided through the holding member so as not to provide an opening on the side, the voltage detection line or the control line is passed through the holding member, for example. On the other hand, since the wires need to be routed in advance, the side routing path 100 of the present embodiment is opened to the side, so that a plurality of wires EW can be routed to the holding member 80. Can be facilitated. Further, after the bus bars 40 and the fuses 70 are assembled in the holding member 80, the voltage detection line W and the control line L can be assembled to the side wiring route 100 and the electric wire routing route 110, so that the assembling workability is excellent. .

  By the way, as in the present embodiment, when a plurality of wires EW are routed on the side routing path 100 provided on the side of the plate-shaped holding member 80, each wire EW is bent at a steep angle. become. For this reason, there is a concern that the electric wire EW protrudes from the side wiring path 100 due to the reaction force of the electric wire EW.

  However, according to the present embodiment, as shown in FIGS. 5, 6, and 8, at the opening edge of each side routing path 100, it is formed so as to protrude in the front-rear direction that is a direction intersecting the opening direction. Since the restriction piece 102 and the pair of restriction pieces 105 are provided, the restriction pieces 102 and 105 can restrict the electric wire EW from protruding from the side wiring path 100.

  Further, since the pair of side wiring paths 100 are provided on both left and right side edges of the holding member 80, the two voltage detection lines W of the connection bus bar 50 disposed on the right side of the holding member 80 are connected to the right side. The five voltage detection lines W of the connection bus bar 50 and the output bus bar 60 disposed on the left side of the holding member 80 can be disposed on the left side routing path 100L. it can.

  That is, for example, the wiring space for the voltage detection lines W on the bus bar holding surface 80U can be reduced as much as possible, as compared with a case where all the voltage detection lines are routed by one of the left and right side routing paths. Thereby, the increase in the size of the connection module 30 can be further suppressed.

  By the way, in general, in order to expose the core wire by stripping the coating at the end of the electric wire, it is necessary to secure a predetermined electric wire length (minimum electric wire length). However, when using the voltage detection line having the minimum wire length, the voltage detection line may be longer than the required wire length in the holding member.

  That is, as in the present embodiment, the voltage detection line W connected to the connection bus bar 50 and the output bus bar 60 disposed on the left side of the holding member 80 is, as shown in FIGS. , The voltage detection line W needs to have a very short wire length. However, since the voltage detection line W becomes unnecessarily long in order to secure the minimum electric wire length, a space for arranging the extra length of the voltage detection line W is required.

  However, as shown in FIGS. 5 and 6, the electric wire routing path 110 of the present embodiment includes a wide wiring path 115 capable of accommodating the extra length of the plurality of electric wires EW generated on the left side of the holding member 80. Of the voltage detection line W is longer than necessary to secure the minimum wire length, the extra length of the voltage detection line W is on the bus bar holding surface 80U of the holding member 80. It can be prevented from being routed. Thereby, the increase in the size of the connection module 30 can be further suppressed.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described above and illustrated in the drawings, and includes, for example, the following various aspects.
(1) In the above embodiment, the configuration is such that four storage elements 21 of the storage element group 20 are arranged so as to overlap in the front-rear direction. However, the present invention is not limited to this, and may be configured as a power storage element group in which five or more power storage elements are stacked and arranged.

(2) In the above embodiment, all the storage elements 21 of the storage element group 20 are connected in series. However, the invention is not limited thereto, and a storage element group in which some storage elements are connected in parallel may be configured.
(3) In the above embodiment, the fuse 70 is arranged on the bus bar holding surface 80U of the holding member 80. However, the configuration is not limited to this, and the fuse may not be arranged on the bus bar holding surface of the holding member.

  (4) In the above-described embodiment, the wire routing path 110 has the wide routing path 115 that accommodates the extra length of the voltage detection line W. However, the present invention is not limited to this, and the electric wire routing path may include only a wiring path that does not accommodate the extra length of the electric wire.

20: Storage element group 21: Storage element 22: Storage element 23: Laminated film (an example of “film”)
24: element body 25: electrode terminal 26: joint 30: connection module 40: bus bar 50: connection bus bar (an example of "bus bar")
60: Output bus bar (an example of "bus bar")
80: holding member 80U: bus bar holding surface 80D: element facing surface 100: side wiring paths 102, 105: regulating piece (an example of a "regulating portion")
110: electric wire route 111: narrow wire route 115: wide wire route EW: electric wire W: voltage detection line (an example of "electric wire")

Claims (8)

A connection module that is assembled to a power storage element group including a plurality of power storage elements having electrode terminals arranged side by side,
A plurality of bus bars to which the electrode terminals of the power storage element are connected,
A plurality of electric wires respectively connected to the plurality of bus bars,
A plate-shaped holding member that holds the plurality of bus bars and the plurality of electric wires,
One surface of the holding member is a bus bar holding surface on which the plurality of bus bars are held,
The other surface opposite to the one surface of the holding member is an element facing surface facing the power storage device group,
A connection module, wherein an electric wire routing path on which the plurality of electric wires are arranged is provided on the element facing surface. The electric wire routing path is open to the storage element group side,
2. The plurality of electric wires according to claim 1, wherein the plurality of electric wires are routed between the bus bar holding surface and the element facing surface through a side wiring route opened laterally on a side portion of the holding member. 3. Connection module.   At the opening edge of the side routing path, a regulating portion is formed, which is formed to protrude in a direction intersecting the opening direction and abuts on the electric wire to regulate the electric wire from protruding from the side routing path. 3. The connection module according to claim 2, wherein:   The connection module according to claim 2, wherein the side wiring path is provided on both side edges of the holding member. The bus bar is provided with the electrode terminals of the adjacent power storage elements arranged and connected along side edges of the bus bar,
5. The electric wire routing path according to claim 1, wherein the holding member is provided on a back side of a part of the plurality of bus bars on which the bus bar is disposed. 6. Connection module.   The wire routing path is provided with a narrow routing path in which a part of the plurality of wires is routed, and is provided wider than the narrow routing path, and a part of the wires. The connection module according to any one of claims 1 to 5, further comprising: a wide wiring portion in which a surplus length of another of the plurality of wires is routed. The power storage element includes an element main body in which the power storage element is wrapped with a resin film and joined to an edge, an electrode terminal derived from one end of the element main body, and the film and the electrode at an edge of the element main body. A terminal and a joined portion joined,
The connection module according to any one of claims 1 to 6, wherein the electric wire routing path is arranged between the joints of the adjacent storage elements in the storage element group. A storage element group in which a plurality of storage elements having electrode terminals are arranged side by side,
A power storage module comprising: a connection module assembled to the power storage element group;
A plurality of bus bars to which the electrode terminals of the power storage element are connected,
A plurality of electric wires respectively connected to the plurality of bus bars,
A plate-shaped holding member that holds the plurality of bus bars and the plurality of electric wires,
One surface of the holding member is a bus bar holding surface on which the plurality of bus bars are held,
The other surface opposite to the one surface of the holding member is an element facing surface facing the power storage device group,
A power storage module, wherein a wire routing path on which the plurality of wires are routed is provided on the element facing surface.

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