JP4686166B2 - Electric cable routing structure of resin cover for battery - Google Patents

Description

  According to the present invention, a battery cover is attached to a battery mounted on an electric vehicle (including a hybrid car), and an electric wire with a terminal in the resin cover is led out to the outside along an electric wire guide wall. It relates to the cable structure.

  FIG. 7 shows an embodiment of a conventional battery connection plate that is attached to a battery for an electric vehicle (including a hybrid car) (see Patent Document 1).

  This battery connection plate 51 is for connecting a plurality of batteries 52 in series, and is arranged vertically on the front and rear electrode sides of the plurality of batteries 52 arranged in parallel.

  Each battery connection plate 51 includes a plate body 53a made of insulating resin, a lid portion 65b that can be opened and closed via a hinge 65 on the plate body 53a, and a rectangular made of conductive metal provided in a plurality of openings 54 of the plate body 53a. Bus bar 55. Each bus bar 55 has two holes 56, and male screw-type positive and negative electrodes 57 and 58 of two adjacent batteries 52 are inserted into the holes 56 and tightened and connected with nuts.

  As shown in FIG. 8, for example, one voltage detection terminal 59 is fastened with a nut for each bus bar 55, and the voltage for each of the two batteries 52 (FIG. 7) is detected. An electric wire 64 is crimped to the voltage detection terminal 59, and the electric wire 64 is connected to a voltage detection device (not shown). Each electric wire 64 is routed along the battery connection plate 51.

The voltage detection terminal 59 has one rectangular electrical contact portion 60, an intermediate resistance connection portion 61, and the other wire connection portion 62, and after both terminals of the resistor 63 are connected to the intermediate resistance connection portion 61. The resistor connection 61 is disconnected between the two terminals, and the voltage of the battery 52 is reduced by the resistor 63 and sent to the voltage detection device (not shown) via the electric wire 64.
Japanese Unexamined Patent Publication No. 2000-333343 (pages 2 to 3, FIGS. 11 to 14)

  However, in the electric wire routing structure of the conventional battery connection plate (resin cover) 51, the electric wire 64 following the electric wire detection terminal 59 is detached from the plate main body 53a or between the plate main body 53a and the lid portion 65. There was a concern of being scratched or damaged by being pinched. In addition, when a strong tensile force is applied to the electric wire 64, the connection portion 62 between the electric wire 64 and the voltage detection terminal 59 is loosened, or an excessive force is applied to the connection portion between the voltage detection terminal 59 and the bus bar 55 or the battery 52. There was a concern that voltage detection could not be performed accurately.

  In view of the above points, the present invention has an excessive load on each connection part due to the detachment of the electric wire from the resin cover, the pinching of the electric wire between the cover part, the damage of the electric wire accompanying it, and the pulling of the electric wire. It aims at providing the electric wire wiring structure of the resin cover for batteries which can prevent.

In order to achieve the above object, a wire covering structure for a resin cover for a battery according to claim 1 of the present invention is a saddle-shaped wire guide for a resin cover to be attached to the electrode-side ends of a plurality of parallel batteries. In the electric wire routing structure of the resin cover for the battery that leads the voltage detection electric wire to the outside along the wall, the opening of the electric wire guide wall has a vertically long first small cover that can be opened and closed and a horizontally long second that can be opened and closed . Two small covers are alternately provided, the first small cover covers a connection portion where the electric wire is connected to the battery via a voltage detection terminal, and the first small cover is provided at one end of the resin cover. The wire insertion space in the wire guide wall is vertically partitioned by an intermediate wall portion, a notch is provided in the middle of the intermediate wall portion, and the upper and lower wire insertion spaces are communicated by the notch portion. a second small cover wire the one terminal of the adjacent In wired by being inside the said second small cover inwardly folded by the cutout portion, characterized in that it is led to the outside through the inside of the first small cover of the one terminal.

With the above configuration, the resin cover insulates the electrode side end of the battery from the outside, and is arranged with a short length in a direction opposite to the direction in which the battery voltage detection wire is led out to the outside at one end of the resin cover. While being searched, it is folded inside the adjacent second small cover and led out to the outside through the inside of the first small cover of the terminal. One terminal wire is routed with an extra length by being folded. The electric wire at one end is covered with the adjacent second small cover and sealed in the electric wire guide wall, and is prevented from jumping out. The electric connection of the electric wire to the battery can be performed with the second small cover closed and the first small cover opened. After the connection, the first small cover is closed, and the electrical connection between the electric wire and the battery is insulated and protected from the outside.
In addition, one end of the electric wire is routed from the lower electric wire insertion space of the electric wire guide wall to the upper electric wire insertion space through the cutout portion and led out to the outside. When the upper part of the electric wire is pulled from the outside, the inner surface of the folded part (bent part) of the electric wire comes into contact with the end face of the middle wall part at the notch to receive the tensile force, and pulls to the lower part of the electric wire. Prevent the propagation of force. As a result, the tensile force does not act on the electrical connection between the wire and the battery, the connection between the wire and the voltage detection terminal, or the connection between the voltage detection terminal and the battery, and each connection is protected safely. Is done.

Wire routing structure for a battery for the resin cover according to claim 2 is the electric wire arrangement structure of a battery for the resin cover according to claim 1, characterized in that the voltage detection terminal to the resin cover is provided.

  With the above configuration, the voltage detection terminal with the electric wire is mounted and fixed in advance on the resin cover, and the electric wire is electrically connected to the battery via the voltage detection terminal. It is also possible to connect the + electrode and the − electrode of two adjacent batteries with a conductive connecting plate in advance by welding or the like, and connect the voltage detection terminal to the connecting plate by welding or the like.

According to the first aspect of the present invention, when the electric wire for voltage detection is electrically connected to the battery, the electric wire at one terminal is pressed by the second small cover even when the first small cover is opened. As a result, the electric connection between the electric wire and the battery can be reliably performed, and the electric wire is damaged due to interference between the electric wire and the outside, or when the first cover is closed after the connection. The electric wire is prevented from being caught, and the battery voltage is accurately detected. Even when the wire is pulled from the outside, the wire is routed in the wire guide wall with a surplus length, so that an excessive load is not applied to the electrical connection portion of the wire. The battery voltage is accurately detected.
In addition, when the electric wire is pulled, the folded portion of the electric wire comes into strong contact with the end surface of the notch in the intermediate wall portion of the electric wire guide wall, and receives the tensile force at the end surface of the notch. Tensile force does not act on the electrical connection part, the connection part between the electric wire and the voltage detection terminal, or the connection part between the voltage detection terminal and the battery side, and each connection part is protected safely, thereby detecting the voltage of the battery Is always done accurately.

  According to the second aspect of the invention, the electric wire can be efficiently assembled to the resin cover via the voltage detection terminal without being displaced, and the electric wire can be efficiently connected to the battery side via the voltage detection terminal. .

  FIG. 1 shows an embodiment of a battery pack having a wire arrangement structure for a battery resin cover according to the present invention, FIG. 2 shows a battery pack before the battery resin cover (hereinafter referred to as a resin cover) is mounted, and FIG. The state where the voltage detection terminal with an electric wire was mounted | worn on the inner surface (back surface) side of the resin cover is each shown.

  As shown in FIG. 1, the battery pack 1 includes a plurality of parallel batteries 2 (FIG. 2), a battery cover 3 that covers the top and bottom of the plurality of batteries 2, and two sheets that are mounted on the front and rear electrode sides of the plurality of batteries 2. And a resin cover 4. The upper and lower battery covers 3 are fastened and fixed to the battery 2 by a plurality of bands 5.

  The resin cover 4 (FIG. 1) is also referred to as a bus bar cover, and covers the conductive metal connection plate 6 (FIG. 2) for connecting each battery 2 on the inner surface side or for the total output connected to the battery 6 of the terminal. The bus bar 7 (FIG. 2) is covered. A voltage detection terminal 8 (FIG. 3) is fixed to the inner surface side of the vertical substrate portion 11 of the resin cover 4, and the voltage detection terminal 8 is attached to the connection plate 6 of the battery 2 (FIG. 2) on the inner surface side of the resin cover 4. Welded with. In FIG. 2, reference numeral 9 denotes an annular + electrode of the battery 2, and 10 denotes a flat negative electrode.

  As shown in FIG. 3, the voltage detection terminal 8 is fixed to the resin cover 4 with a pin portion 23 projecting from the substrate portion 11, a flexible claw portion 25, and a surrounding concave portion (not shown) on the terminal tip side. ing. The pin portion 23 engages with the hole 30 of the terminal 8, the claw portion 25 holds the wire crimping portion 31 of the terminal 8, and a narrow protrusion (not shown) at the tip (lower end) of the terminal is enclosed by the surrounding recess. Incoming engagement.

  The claw portions 25 are arranged on both sides of the narrow opening 21 of the substrate portion 22, and the opening 21 continues to the wide opening 20 on the upper side (on the side of the electric wire guide wall 12) and has a narrow connecting wall 26 having a pin portion 23. Through the lower wide opening 13. A hook-shaped (substantially U-shaped) wire guide wall 12 is integrally provided at the upper end portion of the resin cover 4, and an opening 20 is provided from the lower portion of the wire guide wall 12 to the upper end portion of the substrate portion 11.

  The voltage detection terminal 8 is inserted downward from the opening 20 and is fixed by the claw portion 25 and the pin portion 23 and the like, and the flat electrical contact portion 32 of the terminal 8 is positioned along the wide opening 13. The electric wire 19 is horizontally inserted from the opening 20 on the electric wire guide wall 12 side along the inner surface of the electric wire guide wall 12, and is led out from the side opening 28a of the end of the electric wire guide wall 12 as shown in FIG. Yes. In a state where the voltage detection terminal 8 is fixed to the resin cover 4, the electrical contact portion 32 of the voltage detection terminal 8 is connected and fixed from the front side of the wide opening 13 to the back side connection plate 6 (FIG. 2) by laser welding or the like. .

  As shown in FIGS. 1, 4, and 5, the resin cover 4 includes a vertical substrate portion 11 and a substantially U-shaped wire guide integrally formed on the upper portion of the substrate portion 11. A wall 12, a substantially rectangular opening 13 for connecting (welding) a voltage detection terminal provided on the board portion 11, a long air blowing hole 14 for battery cooling, and an opening 13 covering the opening 13 are locked to the board portion 11. An openable vertically small cover (first small cover) 15 and a horizontally small cover (first cover) that covers the front opening or inlet 28b (FIG. 4) of the wire guide wall 12 and prevents the electric wire 19 from jumping out. Second small cover) 24.

  The vertically long small cover 15 is locked to the hole (locking means) 35 of the substrate portion 11 by a locking claw (locking means) 34, and the horizontally long small cover 16 is locked to the electric wire by the locking claw (locking means) 27. The guide wall 12 is locked in the recess (locking means). The vertically long small cover 15 is bent in two steps on the base side (close to the hinge), the first portion 15a following the hinge covers the front opening 28b of the wire guide wall 12, and the second portion 15b following the first portion is the substrate portion 11. The terminal connection opening 13 is covered.

  The voltage detection terminal connection (welding) opening 13 is arranged at a ratio of one to two batteries, and the air blowing hole 14 is arranged for each battery 2. The resin cover 4 is locked to the battery cover 3 (FIG. 2) by the upper part of the substrate part 11 and the electric wire guide wall 12. That is, the horizontal wall portion 12c (FIG. 5) on the lower side of the electric wire guide wall 12 and the substrate on each locking projection (locking means) 16 between the upper wall of the upper battery cover 3 in FIG. Each engagement hole (locking means) with the upper end side of the part engages.

  On the lower end side of the substrate portion 11 of the resin cover 4, a vertical protruding plate portion 36 is formed for each battery 2, and a notch portion 37 is provided between each protruding plate portion 36, and the battery cover on the lower side with respect to the notched portion 37. 3 (FIG. 2) is provided with a projecting wall 22 having a substantially T-shaped cross section for positioning and holding, and a notch portion 37 is slidably engaged with the projecting wall 22 and the projecting plate portion 36 is held by the projecting wall 22. .

  As shown in FIGS. 4 to 5, the wire guide wall 12 includes upper, middle, and lower horizontal opposing wall portions 12 a, 12 c, and 12 d and a vertical wall portion 12 b that connects the upper and middle wall portions 12 a and 12 c. The upper end of the substrate portion 11 that is mainly configured and is perpendicular to the center in the front-rear (width) direction of the intermediate wall portion 12c continues orthogonally, and the lower wall portion 12d is orthogonal to the substrate portion 11 on the front side of the substrate portion 11. The upper and middle lower wall portions 12a, 12c, and 12d are formed with two upper and lower groove-shaped wire insertion spaces 28, and the middle wall portion 12c allows the upper and lower wire insertion spaces 28 to communicate with each other. A plurality of cutout portions 33 are provided in parallel, and the upper and lower electric wire insertion spaces 28 are communicated with each other in the up and down directions.

The insulation-coated electric wires 19 can be wired in a single line in the upper and lower electric wire insertion spaces (electric wire insertion grooves) 28. Each electric wire insertion space 28 is configured as a long groove in the horizontal direction, surrounded by the respective wall portions 12a to 12d at the top and bottom and the rear.

A small cover 24 that prevents the electric wire 19 from coming out is provided at the entrance 28b of each electric wire insertion space 28 so as to be freely opened and closed. 1 and 5 show a state where the small cover is closed, and FIG. 4 shows a state where the small cover is opened. The small cover 24 is connected to the upper wall portion 12a of the wire guide wall 12 through a thin hinge 24a so as to be freely opened and closed. The small cover 24 is locked by the locking claw 27 to the lower side of the lower wall portion 12 d of the wire guide wall 12. Battery 2 as shown in FIG. 5 are connected in series with each unit cell 2 _1. In FIG. 5, illustration of the battery cover 3 (FIG. 2) is omitted.

  As shown in FIG. 6 which shows an embodiment of the resin cover wire routing structure of the present invention, the wire 19 following the voltage detection terminal 8 is U-turned in the wire guide wall 12 at one end (right end) of the resin cover 4. The side openings 28a are led out to the outside.

  That is, only one vertically long small cover 15 that covers the connection opening 13 that integrally exposes the bus bar 7 (FIG. 2) for total output and the voltage detection terminal 8 welded to the surface of the bus bar is provided at one end of the resin cover 4. Since the front opening 28b of the electric wire guide wall 12 is covered only with the vertically long small cover 15, the voltage detection terminal 8 is welded to the bus bar 7 with the vertically small cover 15 opened, or during maintenance, etc. In addition, there is a concern that the electric wire 19 jumps out of the electric wire guide wall 12 or the electric wire 19 that jumps out is sandwiched between the vertically long small covers 15.

  In order to prevent this, the electric wire 19 following the voltage detection terminal 8 is linearly routed in a direction opposite to the side opening 28a, folded in a substantially U shape in the middle, and passed through the front opening 28b. The wire 19 is linearly routed toward the opening 28a, led out to the outside from the side opening 28a, and the forward portion 19a, the folded portion (bent portion) 19b, and the return portion 19c of the electric wire 19 are adjacent to the front opening 28b. It is covered with a horizontally long small cover 24 and held in the wire guide wall 12.

  The horizontally long small covers 24 are positioned between the vertically long small covers 15 that cover the terminal connection openings 13. In FIG. 6, the electric wire 19 following the second voltage detection terminal 8 from the right end is covered with the first horizontal small cover 24 from the right between the vertical small cover 15 at the right end and the second vertical small cover 15 at the right end. Therefore, it is not necessary to make a U-turn. The same applies to the electric wires 19 following the third and fourth voltage detection terminals 8.

  The forward portion 19a of the electric wire 19 following the voltage detection terminal 8 at one terminal is routed along the lower electric wire insertion space 28 in the electric wire guide wall 12, and the folded portion 19b of the electric wire 19 passes through the upper and lower electric wire insertion spaces 28. It is routed along the notch 33 to be communicated, and the return portion 19 c of the electric wire 19 is routed along the upper wire insertion space 28. The vertical electric wire portion 19d following the voltage detection terminal 8 is introduced into the lower electric wire insertion space 28 from the opening 20 (FIG. 3) on the wall portion 12c side of the electric wire guide wall 12, and is bent horizontally to the forward portion 19a. in the process of.

  The length of the U-turn portion of the electric wire 19 covered with the horizontally long small cover 24 is preferably half or more of the length of the horizontally long small cover 24. The folded portion (bent portion) 19b of the electric wire 19 is bent smoothly along the cutout portion 33 (FIG. 4) which is the end surface of the intermediate wall portion 12c in the electric wire guide wall 12, so that the folded portion 19b is impossible. No bending stress is applied. The return portion 19c, which is the upper portion of the electric wire 19, is routed in a horizontal row together with the electric wires 19 of the other voltage detection terminals 8, and is led out from the side opening 28a.

  The voltage detection terminal 8 is welded to the inner bus bar 7 (FIG. 2) and the connection plate 6 from the connection opening 13 with the horizontally small cover 24 closed and the electric wire 19 held without protruding, and then the vertically long The small cover 15 is closed, and the voltage detection terminal 8, the bus bar 7, and the connection plate 6 are insulated and protected from the outside, together with the vertical portion 19 d and part of the forward portion 19 a and part of the return portion 19 c of the electric wire 19. The horizontally long small cover 24 is locked to the wire guide wall 12 by a locking claw 27, and the vertically long small cover 15 is locked to the hole 35 of the substrate portion 11 by each locking claw 34.

  The terminal wire 19 is U-turned inside the wire guide wall and pressed by the horizontally long small cover 24 to prevent the wire 19 from jumping out (climbing from the wire insertion groove 28). In addition to preventing damage, the electric wire 19 can be prevented from being caught when the vertically long small cover 15 is closed, and the electric wire 19 can be prevented from being damaged.

  In addition, since the electric wire 19 is folded back along the end surface (notch portion 33) of the intermediate wall portion 12c in the electric wire guide wall, even when the electric wire 19 is pulled from the outside, the end surface of the intermediate wall portion 12c is The tensile force of the return part 19c of the electric wire 19 is received and acts as a strain relief, the propagation of the tensile force to the forward part 19a of the electric wire 19 is prevented, and the connecting part (crimp part 31) between the electric wire 19 and the voltage detection terminal 8 is prevented. ), And the connection part (welded part) between the voltage detection terminal 8 and the bus bar 7 or the connection plate 6 is safely protected from the tensile force. This prevents welding peeling of the voltage detection terminal 8 and the like.

  Even if the intermediate wall portion 12c in the wire guide wall is eliminated, the wire 19 is pulled from the outside because the wire 19 is routed in a U-shaped space (extra length) in the wire guide wall. In this case, the extra length portion extends and absorbs the tensile force, whereby each connection portion of the voltage detection terminal 8 is safely protected from the tensile force in the same manner as described above.

  In this example, the electric wire 19 is U-turned at the right end of the resin cover 4 and covered with the horizontally long small cover 24. However, the electric wire 19 is U-turned at the left end instead of the right end, and the horizontally long small on the left end side is covered. It is also possible to cover with the cover 24, and it is also possible to cover each electric wire 19 with U-turns at both the right terminal and the left terminal and cover with the horizontally long small covers 24.

  Further, in the above embodiment, the electric wire 19 is electrically connected to the battery 2 via the voltage detection terminal 8, but the electric wire 19 is directly connected to the battery side by welding or the like without using the voltage detection terminal 8. It is also possible to connect them. Moreover, the structure demonstrated in the said FIG. 6 is effective also as an electric wire wiring method of the resin cover for batteries.

It is a perspective view which shows one form of a battery pack provided with the electric wire wiring structure of the resin cover for batteries of this invention. It is a perspective view which shows partially the battery pack before mounting | wearing with a resin cover. It is the front view seen from the diagonally lower side which shows the state which fixed the terminal with an electric wire to the inner surface side of the resin cover, and wired the electric wire. It is a perspective view which shows one form of the resin cover partially. It is a side view which shows the resin cover arrange | positioned close to the battery. It is a front view which shows one Embodiment of the electric wire wiring structure of the resin cover which concerns on this invention. It is a disassembled perspective view which shows one form of the conventional connection plate which connects a battery in series. It is a disassembled perspective view which shows one form of the voltage detection terminal with the conventional electric wire.

Explanation of symbols

2 Battery 4 Resin cover 8 Voltage detection terminal 12 Electric wire guide wall 12c Middle wall 15 Long vertical cover (first small cover)
19 Electric wire 24 Horizontal small cover (second small cover)
28 Wire insertion space 28b Front opening 33 Notch

Claims (2)

In the electric cable routing structure of the resin cover for the battery that leads the voltage detection wire to the outside along the flange-shaped electric wire guide wall of the resin cover that is attached to the electrode side ends of the plurality of parallel batteries,
The opening of the wire guide wall is alternately provided with a vertically long first small cover that can be opened and closed and a horizontally long second small cover that can be freely opened and closed, and the wire is connected to the battery via a voltage detection terminal. The first small cover covers the connecting portion, the first small cover is disposed at one end of the resin cover , and the electric wire insertion space in the electric wire guide wall is vertically divided by an intermediate wall portion, A notch is provided in the middle of the middle wall, and the upper and lower wire insertion spaces communicate with each other at the notch.
While the electric wire of the one end is routed toward the inside of the adjacent second small cover, it is folded back at the notch inside the second small cover so as to pass the inside of the first small cover of the one end. An electric cable routing structure for a resin cover for a battery, wherein the electric cable is led out to the outside. The electric wire routing structure for a battery resin cover according to claim 1, wherein the voltage detection terminal is provided on the resin cover.

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