Patent Abstract:
[Problem] To provide a terminal connection structure that can reliably connect terminals together even if the positional offset between the terminals is great. 
     [Solution] The terminal connection structure connects a busbar and a first terminal connected to the coil of a motor. The terminal connection structure is provided with: a base having a bottom wall; a terminal holder that can hold the first terminal and the busbar in an overlapping state; and a mobile attachment section. The mobile attachment section has: a bottom plate section that is provided to the terminal holder and that is parallel to the bottom wall; and a holding slit that is provided to the base, is entered by the bottom plate section, and is larger than the bottom plate section. The mobile attachment section attaches the terminal holder to the base movably in parallel to the surface of the bottom wall.

Full Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a National Stage of International Application No. PCT/JP2011/072457 filed Sep. 29, 2011, claiming priority based on Japanese Patent Application No. 2010-223681, filed Oct. 1, 2010, the contents of all of which are incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     This invention relates to a terminal connection structure for connecting terminals to each other, in particular, the terminal connection structure for connecting to a power device to which voltage for running a vehicle is applied. 
     BACKGROUND ART 
     Currently, a hybrid vehicle and an electric vehicle which are driven by a rotary drive power of a motor are used for reducing an impact on an environment. A power device such as a battery, an inverter, a motor, a generator, and the like to which voltage for running a vehicle is applied is mounted on a vehicle driven by a rotary drive power of a motor such as a hybrid vehicle and an electric vehicle. Because a value of an electric current flowing through these power devices is high, cables used for connecting the power devices to each other are thicker than electric wires used for transmitting a signal and supplying electric power to electronic devices. Further, conventionally, various terminal connection structures (for example, see PTL 1) are used for connecting these thick cables to the power devices. 
     The terminal connection structure described in the PTL 1 includes: a male connector; and a female connector configured to be connected to each other. The male connector includes: a male connector housing; and male terminals respectively connected to coils of a motor as the power device and received in the male connector housing. The male connector housing includes: an outer tubular section as a base; an inner tubular section received in the outer tubular section and fitted to a female connector housing; and a thin flexible coupling piece continued to the outer and inner tubular sections. The female connector includes: a female connector housing; and female terminals received in the female connector housing and configured to be connected to the male terminals. 
     The terminal connection structure described in the PTL 1 allows the terminals to be connected to each other by elastically deforming the thin coupling piece even if a position of the male connector, namely, the male terminal connected to the coil of the motor is offset upon fitting the female connector to the male connector. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] 
     JP, A, 2002-93531 
     SUMMARY OF INVENTION 
     Technical Problem 
     According to the terminal connection structure described in the PTL 1, the outer and inner tubular sections of the male connector housing are coupled to each other by the thin coupling piece, and the terminals are connected to each other by elastically deforming the thin coupling piece. However, depending on the positional offset of the terminals, the elastically deformed thin coupling piece may prevent the inner tubular section from moving. Namely, the terminal connection structure described in the PTL 1 only supports a small positional offset of the terminals. 
     Accordingly, an object of the present invention is to provide a terminal connection structure that can reliably connect terminals together even if the positional offset of the terminals is great. 
     Solution to Problem 
     For attaining the object, according to a first aspect of the present invention, there is provided a terminal connection structure for connecting a second terminal to a first terminal which is connected to a power device, said terminal connection structure including: 
     a base having a bottom wall; 
     a terminal holder that can hold the first and second terminals in an overlapping state; and 
     a mobile attachment section having a parallel wall that is provided on one of the base and the terminal holder and that is parallel to the bottom wall, and a holding slit that is provided to the other of the base and the terminal holder, is entered by the parallel wall, and is larger than the parallel wall, and attaching the terminal holder to the base movably and parallel to a surface of the bottom wall. 
     According to a second aspect of the present invention, there is provided the terminal connection structure as described in the first aspect, further including: a clip terminal having a pair of contact pieces for holding the first and second terminals in the overlapping state therebetween, and a bias coupling section continued to the pair of contact pieces and biasing the pair of contact pieces holding the first and second terminals therebetween toward a direction close to each other, 
     said clip terminal configured to be moved close to the terminal holder in a direction crossing the first and second terminals in the overlapping state, and attached to the terminal holder with the pair of contact pieces holding the first and second terminals in the overlapping state therebetween. 
     According to a third aspect of the present invention, there is provided the terminal connection structure as described in the second aspect, further including: 
     a clip terminal holder covering the clip terminal and having a locking section to be locked with the terminal holder. 
     According to a fourth aspect of the present invention, there is provided the terminal connection structure as described in any one of the first to third aspects, further including: 
     a press fixing member configured to be attached to the base, and pressing the first terminal toward the bottom wall when attached to the base. 
     According to the terminal connection structure as described in the first aspect of the present invention, when the parallel wall provided on one of the terminal holder and the base is inserted into the holding slit that is larger than the parallel wall, the terminal holder becomes movable in a direction parallel to a surface of the bottom wall of the base. Therefore, there is nothing that prevents the terminal holder from moving other than an inner wall of the holding slit. 
     According to the terminal connection structure as described in the second aspect of the present invention, when the first and second terminals are held between the pair of contact pieces of the clip terminal close to these terminals along a direction crossing a longitudinal direction of these terminals in the overlapping state, these terminals are connected to each other. Therefore, even if the first and second terminals are arranged parallel to each other with a gap, these terminals can be surely connected to each other. 
     Further, because the clip terminal includes the pair of contact pieces and the bias coupling section biasing the pair of contact pieces toward a direction close to each other, the terminals in the overlapping state can be held between the pair of contact pieces. Therefore, the first and second terminals can be surely and electrically connected to each other. 
     According to the terminal connection structure as described in the third aspect of the present invention, because the terminal connection structure includes the clip terminal holder covering the clip terminal and locked with the terminal holder, the clip terminal holder prevents the clip terminal from falling out. 
     According to the terminal connection structure as described in the fourth aspect of the present invention, because the terminal connection structure includes the press fixing member pressing the first terminal toward the bottom wall when attached to the base, the first terminal can be positioned in a thickness direction of the bottom wall of the base by the press fixing member. 
     Advantageous Effects of Invention 
     As explained above, according to the invention as described in the first aspect, because there is nothing that prevents the terminal holder from moving other than an inner wall of the holding slit, the terminal holder becomes movable with respect to the bottom wall of the base within a gap between the holding slit and the parallel wall. Therefore, by adjusting properly a size of the holding slit, the terminals can be moved widely with respect to the base, and even if the positional offset between the terminals is great, the terminals are surely connected to each other. 
     According to the invention as described in the second aspect, even if the first and second terminals are arranged parallel to each other with a gap, these terminals can be surely connected to each other. Therefore, when the first and second terminals are arranged parallel to each other with a gap, a width of the terminal connection structure can be further reduced than when these terminals are arranged on the same plane. As a result, the terminal connection structure can be downsized. 
     By holding the terminals in the overlapping state between the pair of contact pieces of the clip terminal, the first and second terminals can be surely and electrically connected to each other. Therefore, the terminals can be surely connected to each other. 
     According to the invention as described in the third aspect, because the clip terminal holder prevents the clip terminal from falling out, a connection between the terminals is prevented from being released unexpectedly. 
     According to the invention as described in the fourth aspect, the first terminal can be positioned in a thickness direction of the bottom wall of the base by the bias fixing member. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view showing a terminal connection structure according to an embodiment of the present invention. 
         FIG. 2  is an exploded perspective view showing the terminal connection structure shown in  FIG. 1 . 
         FIG. 3  is a perspective view showing a base of the terminal connection structure shown in  FIG. 1 . 
         FIG. 4  is a perspective view showing a terminal holder of the terminal connection structure shown in  FIG. 1 . 
         FIG. 5  is a perspective view showing a condition that the terminal holder is attached to the base of the terminal connection structure shown in  FIG. 3 . 
         FIG. 6  is a sectional view taken on line VI-VI of  FIG. 5 . 
         FIGS. 7A and 7B  are perspective views showing a clip terminal of the terminal connection structure shown in  FIG. 1 . 
         FIG. 8  is a perspective view showing a condition that a busbar is held in the terminal holder of the terminal connection structure shown in  FIG. 5 . 
         FIG. 9  is a perspective view showing a condition that a first terminal is held in the terminal holder of the terminal connection structure shown in  FIG. 8 . 
         FIG. 10  is a perspective view showing a condition that a press fixing section is attached to the base of the terminal connection structure shown in  FIG. 1 . 
         FIG. 11  is a sectional view taken on line XI-XI of  FIG. 1 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a terminal connection structure according to an embodiment of the present invention will be explained with reference to  FIGS. 1 to 11 . As shown in  FIGS. 1 and 2 , a terminal connection structure  1  according to this embodiment connects a first terminal  3  connected to a coil  2  of a motor as one power device with a busbar (e.g., second terminal)  4  as a second terminal connected to an inverter as the other power device. Incidentally, the power device of the present invention means a device to which a voltage for running a vehicle is applied such as a battery, an inverter, a motor, and a generator. 
     The first terminal  3  is made of conductive metal. As shown in  FIG. 2 , the first terminal  3  integrally includes: a gutter-shaped coil connecting section  5 ; and a band-plate-shaped electric contact section  6 . The coil connecting section  5  integrally includes: a bottom plate section  7 ; and a pair of side plate sections  8  extended vertically from both edges in a width direction of the bottom plate section  7 , and is formed in a gutter shape. When the coil  2  is overlapped with the bottom plate section  7 , the coil  2  is attached to the coil connecting section  5 . Both surfaces of the electric contact section  6  are arranged on the same plane as both surface of one of the side plate sections  8 . The number of the first terminal  3  is six in an example shown in  FIGS. 1 and 2 . Further, a plurality of first terminals  3  is arranged parallel to each other with a gap. Namely, the surfaces of the electric contact sections  6  of the first terminals  3  are arranged parallel to each other with a gap. 
     The busbar  4  is made of conductive metal. As shown in  FIG. 2 , the busbar  4  is formed in a band plate shape and bent 90 degree at two positions, and is flexible (namely, elastically deformable). The number of the busbar  4  is six in an example shown in  FIGS. 1 and 2 . A thin-walled section  9  as the electric contact portion thinner than the other sections is provided on one end of the busbar  4 . Further, a connector housing  10  for connecting with the inverter as the other power device is attached to the other end of the busbar  4 . Further, a plurality of busbars  4  is arranged parallel to each other with a gap. Namely, surfaces of the thin-walled sections  9  of the busbars  4  are arranged parallel to each other with a gap. 
     The terminal connection structure  1  respectively connects three first terminals  3  with three busbars  4 . Of course, the terminal connection structure  1  connects the terminal connection structure  1  with the busbar  4  one to one. Namely, in the example shown in  FIGS. 1 and 2 , two terminal connection structures  1  are provided. As shown in  FIGS. 1 and 2 , the terminal connection structure  1  includes: a base  11 ; a terminal holder  12 ; a mobile attachment section  13 ; a clip connector  14 ; and a press fixing member  15 . 
     The base  11  is made of insulating synthetic resin, and as shown in  FIG. 3 , integrally includes: a flat-plate-shaped bottom wall  16 ; a pair of vertically extended pieces  17  extended vertically from both edges of the bottom wall  16 ; two edge projection sections  18 ; two partition projection sections  19 ; and parallel wall sections  20 . An engaging hole  21  penetrates the center of the vertically extended piece  17 . The edge projection sections  18  are projected from both edges of the bottom wall  16  from which the vertically extended pieces  17  are vertically extended and arranged in the same plane as the pair of vertically extended pieces  17 . Each partition projection section  19  is formed in a straight shape, and projected from the bottom wall  16 . The partition projection sections  19  are arranged parallel to each other with a gap. The partition projection sections  19  are provided between the pair of vertically extended pieces  17 . A longitudinal direction of the partition projection section  19  is parallel to both surfaces of the vertically extended pieces  17 . The parallel wall sections  20  are respectively continued to tips of the edge projection sections  18  and the partition projection sections  19 , and provided parallel to the bottom wall  16  with a gap. Further, the parallel wall sections  20  adjacent to each other are provided with a gap. 
     The terminal holder  12  is made of insulating synthetic resin, and as shown in  FIG. 4 , integrally includes: a flat-plate-shaped bottom plate section  22  as a parallel wall; a pair of vertically extended pillars  23  extended vertically from both edges of the bottom plate section  22 ; a pair of coupling beams  24 ; and a supporting piece  25 . A width of the bottom plate section  22  is formed narrower than an interval between the edge projection section  18  and the partition projection section  19  adjacent to each other, and narrower than an interval between the partition projection sections  19 . The bottom plate section  22  is inserted into the interval between the edge projection section  18  and the partition projection section  19  adjacent to each other, and into the interval between the partition projection sections  19 . Further, the bottom plate section  22  is inserted into between the bottom wall  16  and the parallel wall section  20 . 
     The pair of vertically extended pillars  23  is extended vertically from both ends in a longitudinal direction of the bottom plate section  22 , and provided parallel to each other with a gap. A through-hole  26  for passing the thin-walled section  9  provided on one end of the busbar  4  and not passing the other sections of the busbar  4  penetrates one vertically extended pillar  23  disposed at a front side of  FIG. 4 . The other vertically extended pillar  23 A at a rear side of  FIG. 4  is provided with a slit  27  extended from a top end to a bottom end near the bottom plate section  22  of the vertically extended pillar  23 . A tapered section  28  gradually reducing a width of the slit  27  as extended toward the bottom plate section  22  is provided on a top end of the other vertically extended pillar  23 . 
     The pair of coupling beams  24  is spaced from the bottom plate section  22 . A longitudinal direction of the pair of coupling beams  24  is provided parallel to a surface of the bottom plate section  22 . The pair of coupling beams  24  couples the pair of vertically extended pillars  23  to each other. The supporting piece  25  is extended from the center of the other vertically extended pillar  23  toward a direction away from the one vertically extended pillar  23 . The supporting piece  25  supports the coil connecting section  5  of the first terminal  3  by overlapping the coil connecting section  5  on a surface of the supporting piece  25 . 
     As shown in  FIG. 5 , when the bottom plate sections  22  are inserted into the interval between the edge projection section  18  and the partition projection section  19  adjacent to each other, and into the interval between the partition projection sections  19 , and inserted into between the bottom wall  16  and the parallel wall section  20 , the terminal holder  12  is attached to the base  11 . Then, the thin-walled sections  9  of the busbar  4  is passed through the through-hole  26  of the terminal holder  12 , and the electric contact section  6  of the first terminal  3  is received in the slit  27  of the terminal holder  12 . Further, the coil connecting section  5  of the first terminal  3  is overlapped with the supporting piece  25  of the terminal holder  12 . Thus, the terminal holder  12  holds the thin-walled sections  9  of the busbar  4  and the electric contact section  6  of the first terminal  3  in a manner that the thin-walled sections  9  and the electric contact section  6  are overlapped with each other. 
     As shown in  FIG. 6 , the mobile attachment section  13  includes: the bottom plate section  22 ; a holding slit  29 ; a dropout prevention hole  30 ; and a dropout prevention projection  31 . As described above, the bottom plate sections  22  are inserted into the intervals between the edge projection section  18  and the partition projection section  19  adjacent to each other, between the partition projection sections  19 , and between the bottom wall  16  and the parallel wall section  20 , and provided parallel to the bottom wall  16 . The holding slits  29  are spaces between the edge projection section  18  and the partition projection section  19  adjacent to each other, between the partition projection sections  19 , and between the bottom wall  16  and the parallel wall section  20 . Resultingly, in an example shown in  FIG. 3 , the number of the holding slit  29  is three. The holding slit  29  is formed wider (larger) than an outer shape of the bottom plate section  22 . When the bottom plate section  22  is received in an inside of the holding slit  29 , the bottom plate section  22 , namely, the terminal holder  12  becomes movable in a direction parallel to a surface of the bottom wall  16 . 
     The dropout prevention hole  30  is a rectangular hole in a plan view penetrating the bottom wall  16 . The number of the dropout prevention hole  30  is the same as the terminal holder  12 , namely, the holding slit  29 . The dropout prevention hole  30  is respectively provided on the interval between the edge projection section  18  and the partition projection section  19  adjacent to each other of the bottom wall  16  and on the interval between the partition projection sections  19  one by one. The dropout prevention projection  31  is projected from the bottom plate section  22  of the terminal holder  12  in a direction opposite to the vertically extended pillars  23 . As shown in  FIG. 6 , by entering an inside of the dropout prevention hole  30 , the dropout prevention projection  31  prevents the bottom plate section  22 , namely, the terminal holder  12  from dropping out of the bottom wall  16 , namely, the base  11 . A planar shape of the dropout prevention projection  31  is smaller enough than a planar shape of the dropout prevention hole  30  so that the dropout prevention projection  31  does not interfere with a movement of the bottom plate section  7  in the holding slit  29 , namely, the shape of the dropout prevention projection  31  is so formed as to allow the bottom plate section  22  movable throughout the holding slit  29 . 
     In the mobile attachment section  13 , when the bottom plate section  22  is received in the holding slit  29 , and the dropout prevention projection  31  enters the dropout prevention hole  30 , the terminal holder  12  is attached to the base  11  movable in a direction parallel to a surface of the bottom wall  16 . 
     The number of the clip connector  14  is the same as the terminal holder  12  and the holding slit  29  (three in an example shown in figures). As shown in  FIG. 11 , the clip connector  14  includes: a clip terminal  33 ; and a clip terminal holder  34 . 
     The clip terminal  33  is made of conductive metal. As shown in  FIGS. 7A and 7B , the clip terminal  33  integrally includes: a pair of contact pieces  35  formed in substantially a plate shape, and arranged parallel to each other with a gap; and a bias coupling section  36  respectively continued to the contact pieces  35 . As shown in  FIG. 11 , the clip terminal  33  holds the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  overlapped with each other between the pair of contact pieces  35 . When the clip terminal  33  holds the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  overlapped with each other between the pair of contact pieces  35 , an elastic restoring force for biasing the pair of contact pieces  35  holding the electric contact section  6  and the thin-walled section  9  therebetween in a direction close to each other is generated in the bias coupling section  36 . 
     The clip terminal holder  34  is made of insulating synthetic resin. As shown in  FIG. 11 , the clip terminal holder  34  includes: a box-shaped holder main body  37 ; a terminal receiving space  38  provided at one end in a longitudinal direction of the holder main body  37 ; and a pair of locking projections  39  as engaging sections. The terminal receiving space  38  is provided on the holder main body  37 , and opened on an end wall at the one end of the holder main body  37 . The terminal receiving space  38  receives the clip terminal  33  therein. The locking projection  39  is projected outward from an outer side wall of at the one end of the holder main body  37 , and locked with the coupling beam  24  so as to attach the clip terminal holder  34 , namely, the clip connector  14  to the terminal holder  12 . 
     The clip connector  14  having the above described configuration is assembled by receiving the clip terminal  33  in the terminal receiving space  38 , and by covering the clip terminal  33  with the clip terminal holder  34 . Then, the clip connector  14  is positioned in a condition that the clip terminal  33  faces the pair of vertically extended pillars  23  of the terminal holder  12  in a direction perpendicular to (crossing) the longitudinal direction of the thin-walled section  9  of the busbar  4  and the electric contact section  6  of the first terminal  3  held by the terminal holder  12 . Then, the clip connector  14  is moved close to an interval between the pair of vertically extended pillars  23 , namely, the terminal holder  12  in a manner that a tip of the contact piece  35  of the clip terminal  33  is moved close to the electric contact section  6  and the thin-walled section  9  overlapped with each other. As a result, of course, the clip terminal  33  is moved close to the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  along a direction perpendicular to (crossing) the longitudinal direction of the electric contact section  6  of the terminal connection structure  1  and the thin-walled section  9  of the busbar  4  overlapped with each other. Then, as shown in  FIG. 11 , when the clip terminal  33  holds the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  overlapped with each other between the pair of contact pieces  35 , and the locking projection  39  is locked with the coupling beam  24  in a manner that the clip terminal holder  34  is interposed between the pair of vertically extended pillars  23 , the clip connector  14  is fixed to the terminal holder  12 . 
     The press fixing member  15  is made of insulating synthetic resin. As shown in  FIG. 4 , the press fixing member  15  includes: a bar-shaped member main body  40 ; a pair of engaging beams  41  extended vertically from both ends in a longitudinal direction of the member main body  40 ; and an engaging projection  42 . Each engaging beam  41  is formed in a bar shape, and provided parallel to each other, and extended in the same direction from both ends of the member main body  40 . The engaging projection  42  is projected outward from an outer sidewall of the engaging beams  41 , and engaged with the engaging hole  21  of the vertically extended piece  17  of the base  11 . When the engaging projection  42  is engaged with the engaging hole  21  of the vertically extended piece  17  of the base  11 , the press fixing member  15  is attached to the base  11 . When the press fixing member  15  is attached to the base  11 , the member main body  40  abuts on the coil connecting section  5  of the first terminal  3  held by the terminal holder  12  and pushes the coil connecting section  5  toward the supporting piece  25 , namely, the bottom wall  16  of the base  11 . 
     The above terminal connection structure  1  is assembled as below. The terminal holder  12  is attached to the base  11 , and the thin-walled section  9  is passed through the through-hole  26  of the terminal holder  12  so that the busbar  4  is held in the terminal holder  12 . Further, the connector housing  10  for connecting the inverter as the other power device is attached to the other end of the busbar  4 . 
     Then, as shown in  FIG. 8 , after the electric contact section  6  of the first terminal  3  is arranged facing the slit  27  of the terminal holder  12  along a longitudinal direction of the slit  27 , the electric contact section  6  of the first terminal  3  is inserted into the slit  27  of the terminal holder  12 . Then, as shown in  FIG. 9 , the first terminal  3  is held in the terminal holder  12  attached to the base  11 . 
     Then, as shown in  FIG. 9 , after the press fixing member  15  is arranged facing the supporting piece  25  of the terminal holder  12  along a direction perpendicular to (crossing) the longitudinal direction of the electric contact section  6  and the thin-walled section  9  held in the terminal holder  12 , the press fixing member  15  is inserted into between the pair of vertically extended pieces  17  of the base  11 . Then, as shown in  FIG. 10 , when the engaging projection  42  is engaged with the engaging hole  21 , the press fixing member  15  is attached to the base  11 . At this time, of course, the press fixing member  15  pushes the coil connecting section  5  of the first terminal  3  toward the bottom wall  16  of the base  11 . 
     Then, as shown in  FIG. 10 , after the clip connector  14  is arranged facing an interval between the pair of vertically extended pillars  23  of the terminal holder  12  along a direction perpendicular to (crossing) the longitudinal direction of the electric contact section  6  and the thin-walled section  9  held in the terminal holder  12 , the clip connector  14  is inserted between the pair of vertically extended pillars  23 . Then, when the locking projections  39  are locked with the coupling beams  24 , the clip connector  14  is attached to the terminal holder  12 . At this time, of course, when the clip connector  14  is moved close to the terminal holder  12 , the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  are caught between the pair of contact pieces  35  of the clip terminal  33 . At this time, even if the electric contact section  6  of the first terminal  3  and the thin-walled sections  9  of the busbar  4  are separated with each other due to a positional offset of the coil  2  of the motor or the like, as they are inserted between the contact pieces  35  of the clip terminal  33 , due to the elastic restoring force of the bias coupling section  36  and the mobile attachment section  13 , the busbar  4  is elastically deformed and the terminal holder  12  is moved relative to the base  11  so that the electric contact section  6  and the thin-walled sections  9  are closely attached to each other. Thus, when the locking projections  39  are locked with the coupling beams  24 , as shown in  FIG. 11 , the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  are closely overlapped with each other due to the elastic restoring force of the bias coupling section  36  of the clip terminal  33 . Thus, the terminal connection structure  1  is assembled, and the busbar  4  and the first terminal  3  are connected to each other. Then, when busbars  43  connected to the inverter as the other power device and a joint connector  44  are attached to the connector housing  10 , the motor as the one power device and the inverter as the other power device are connected to each other. Further, the terminal connection structure  1  assembled as above described is received in a housing of the motor or the like. 
     According to this embodiment, when the bottom plate section  22  as the parallel wall provided on one of the terminal holder  12  and the base  11  is inserted into the holding slit  29  that is larger than the bottom plate section  22 , the terminal holder  12  becomes movable in a direction parallel to a surface of the bottom wall  16  of the base  11 . Therefore, there is nothing that prevents the terminal holder  12  from moving other than an inner wall of the holding slit  29 . Therefore, the terminal holder  12  becomes movable with respect to the bottom wall  16  of the base  11  within a gap between the holding slit  29  and the bottom plate section  22 . Therefore, by adjusting properly a size of the holding slit  29 , the first terminal  3  can be moved widely with respect to the base  11 , and even if the positional offset between the first terminal  3  and the busbar  4  is great, they are surely connected to each other. 
     When the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  are held between the pair of contact pieces  35  of the clip terminal  33  close to them along a direction perpendicular to (crossing) a longitudinal direction of them overlapped with each other, they are connected to each other. Therefore, even if the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  are arranged parallel to each other with a gap, they can be surely connected to each other. Therefore, when the electric contact section  6  of the first terminal  3  and the thin-walled section  9  of the busbar  4  are arranged parallel to each other with a gap, a width of the terminal connection structure  1  can be further reduced than when they are arranged on the same plane. As a result, the terminal connection structure  1  can be downsized. 
     Further, because the clip terminal  33  includes the pair of contact pieces  35  and the bias coupling section  36  biasing the pair of contact pieces  35  toward a direction close to each other, the electric contact section  6  and the thin-walled section  9  overlapped with each other can be held between the pair of contact pieces  35 . Therefore, the first terminal  3  and the busbar  4  can be surely and electrically connected to each other. 
     Because the terminal connection structure  1  includes the clip terminal holder  34  covering the clip terminal  33  and locked with the terminal holder  12 , the clip terminal holder  34  prevents the clip terminal  33  from falling out. Therefore, a connection between the first terminal  3  and the busbar  4  is prevented from being released unexpectedly. 
     Because the terminal connection structure  1  includes the press fixing member  15  pressing the first terminal  3  toward the bottom wall  16  of the base  11  when attached to the base  11 , the first terminal  3  can be positioned in a thickness direction of the bottom wall  16  of the base  11  by the press fixing member  15 . 
     According to the above described embodiment, the holding slit  29  is provided on the base  11 , and the bottom plate section  22  as the parallel wall is provided on the terminal holder  12 . However, according to the present invention, the holding slit  29  may be provided on the terminal holder  12 , and the bottom plate section  22  as the parallel wall may be provided on the base  11 . 
     Incidentally, the above embodiment only shows a representative example of the present invention. The present invention is not limited to the embodiment. Namely, various modifications can be practiced within a scope of the present invention. 
     REFERENCE SIGNS LIST 
     
         
           1  terminal connection structure 
           3  first terminal 
           4  busbar (e.g., second terminal) 
           11  base 
           12  terminal holder 
           13  mobile attachment section 
           15  press fixing member 
           16  bottom wall 
           22  bottom plate section (parallel wall) 
           29  holding slit 
           33  clip terminal 
           34  clip terminal holder 
           35  contact piece 
           36  bias coupling section 
           39  locking projection (locking section)

Technology Classification (CPC): 7