JP2012155948A - Bus bar for battery pack and bus bar module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessively high temperature while limiting increase in the weight and installation space according to the magnitude of power to be transmitted, in a bus bar for a battery pack.SOLUTION: In a bus bar 10 for a battery pack, a bottom plate 11 and an erection part 13 are formed. The bottom plate 11 is a planar portion where two holes 12 for inserting the electrode of a battery cell in a battery pack are formed. The erection part 13 is a portion formed while erecting in the shape of a series of plates at the side edge of the entire first region A1 from the position of one hole 12 in the bottom plate 11 to the position of the other hole 12. The bus bar module 1 is provided with a plurality of bus bars 10, and a plurality of bus bar housing parts 20 having the supporting part 22 and the enclosing part 21 of the bus bars 10. The erection part 13 is formed at a height equal to or lower than the height of the enclosing part 21.

Description

  The present invention relates to an assembled battery bus bar that electrically connects electrodes of two adjacent battery cells included in an assembled battery, and a bus bar module including a plurality of assembled battery bus bars.

  A battery pack including a plurality of battery cells is mounted on an electric vehicle such as an electric vehicle and a hybrid vehicle. The assembled battery includes a plurality of battery cells arranged such that a positive electrode and a negative electrode are adjacent to each other, and the positive electrode and the negative electrode of two adjacent battery cells are connected by a bus bar made of a conductor such as a copper member. The Thereby, the battery cells are electrically connected in series, and an assembled battery having a large output voltage is configured.

  Moreover, as shown in Patent Document 1, in an assembled battery, a plurality of bus bars are integrally held by a non-conductive holder in a state where the plurality of bus bars are arranged so as to be set on electrodes of each battery cell in the assembled battery. There are many cases. The holder has a plurality of bus bar accommodating portions provided for each bus bar. The bus bar accommodating portion is made of a non-conductive member, for example, a resin molded member, having a support portion that supports the bus bar and a surrounding portion that is formed upright around the bus bar.

  Hereinafter, a combination of a plurality of bus bars for an assembled battery and a non-conductive holder that holds the plurality of bus bars is referred to as a bus bar module. In the bus bar module, the holder has both a function of electrically insulating a plurality of bus bars and a function of facilitating handling by integrating the plurality of bus bars.

  As shown in Patent Literature 1, a battery pack bus bar is usually a flat plate member made of a conductor, and two holes into which battery cell electrodes are inserted are formed. The length of the battery pack bus bar is generally determined according to the pitch of the electrodes of each battery cell in the battery pack. On the other hand, the width and thickness of the assembled battery bus bar are determined so as to ensure a cross-sectional area that does not cause excessive heat generation according to the magnitude of power transmitted by the bus bar.

  In recent years, in an assembled battery mounted on a vehicle such as an electric vehicle and a hybrid vehicle, a bus bar having a large thickness and width is being employed in order to prevent excessive heat generation of the bus bar as the output power increases.

JP 2000-149909 A

  However, in order to prevent excessive temperature rise due to heat generation, the conventional battery pack bus bar needs to have a proportionally larger cross-sectional area in accordance with the magnitude of transmitted power. In particular, in the bus bar module, the bus bar is surrounded by the enclosure portion of the bus bar accommodating portion, and therefore easily becomes hot due to heat generation.

  Therefore, the conventional battery pack bus bar has a problem that the weight and installation space increase in proportion to the output power of the battery pack. In addition, an increase in the size of the bus bar is not preferable because it leads to an increase in material cost and transportation cost and a deterioration in fuel consumption of the vehicle.

  An object of the present invention is to prevent an excessive increase in temperature while suppressing an increase in weight and installation space according to the magnitude of transmitted power in a battery pack bus bar.

The assembled battery bus bar according to the present invention includes a conductor that electrically connects the electrodes of two adjacent battery cells included in the assembled battery, and includes the following components.
(1) The first component is a plate-like bottom plate portion in which two holes into which electrodes are inserted are formed.
(2) The second component is formed in a series of plate-like shapes standing on the side edge of the entire first region extending from the position of one hole to the position of the other hole in the bottom plate portion. The first upright part.

  Moreover, in the assembled battery bus bar according to the present invention, it is more preferable that the first upright portion is formed at both side edges of the first region in the bottom plate portion.

  Moreover, the assembled battery bus bar according to the present invention further includes a second upright portion formed upright on a part or the whole of the edge of the second region which is a region other than the first region in the bottom plate portion. Can be considered.

  Further, in the assembled battery bus bar according to the present invention, it is considered that a chipped portion communicating from the inside to the outside is formed between the first standing portion and the second standing portion or a part of the second standing portion. It is done.

Moreover, this invention may be grasped | ascertained as invention of the bus-bar module provided with the bus bar for assembled batteries which concerns on this invention. That is, the bus bar module according to the present invention includes the following components.
(1) A 1st component is a some bus bar which electrically connects the electrode of two adjacent battery cells in the assembled battery containing a some battery cell.
(2) The second component is a plurality of bus bar accommodating portions that are provided for each bus bar and are formed of a member having a support portion that supports the bus bar and a surrounding portion that is formed upright around the bus bar.
(3) The third component is a plate-like bottom plate part that forms part of the bus bar and has two holes into which the electrodes are inserted.
(4) The fourth component forms a part of the bus bar, and the height of the enclosing portion of the bus bar housing portion at the side edge of the first region extending from one hole to the other hole in the bottom plate portion. It is the 1st standing part which stood at the following height and was formed in a series of plate shape.

  Further, also in the bus bar of the bus bar module according to the present invention, as in the assembled battery bus bar according to the present invention, the first upright portion is formed on both side edges of the first region in the bottom plate portion, And it is possible that the 2nd standing part is formed in the baseplate part.

It is also conceivable that the bus bar module according to the present invention has a configuration shown in the following (5) and (6).
(5) A first chipped portion communicating from the inside to the outside is formed between the first standing portion and the second standing portion of the bus bar or at a part of the second standing portion.
(6) A second chipped portion that communicates with the first chipped portion of the busbar is formed in the enclosure portion of the busbar housing portion.

  In the battery pack bus bar, the region extending from one position to the other of the two holes into which the electrodes are inserted is a region through which the current flowing between the electrodes passes, and the cross-sectional area of this region affects the heat generation amount. To do. In the battery pack bus bar according to the present invention, a region including the first region of the bottom plate portion and the first upright portion on the side thereof is a region through which a current flowing between the electrodes passes. Moreover, the area | region which combined the 1st area | region of the baseplate part and the 1st standing part of the side has the same length, width, and cross-sectional area compared with the 1st area | region of the baseplate part corresponded to the conventional bus bar. In this case, the surface area becomes large.

  By the way, the battery pack bus bar according to the present invention is taller than the conventional flat bus bar by the height of the first upright portion. However, the battery pack bus bar is used in a state where the electrode extending from the battery cell is inserted into the hole. Therefore, in the state where the assembled battery bus bar is attached to the assembled battery, the space above the edge of the bottom plate portion is usually an empty space. Therefore, if the height of the tip portion of the first standing portion is equal to or less than the height of the tip portion of the electrode of the battery cell, there is substantially no increase in installation space due to the provision of the first standing portion. .

  As described above, the assembled battery bus bar according to the present invention is superior in heat dissipation performance and does not substantially increase the installation space as compared with the conventional flat bus bar. Therefore, the battery pack bus bar according to the present invention has a substantial installation space and a temperature condition reached by the balance between heat generation and heat dissipation compared to the conventional flat bus bar. The cross-sectional area can be reduced. That is, by employing the assembled battery bus bar according to the present invention, it is possible to prevent an excessive increase in temperature while suppressing an increase in weight and installation space according to the magnitude of transmitted power.

  In addition, since the first standing portion is formed at the edge on both sides of the first region in the bottom plate portion, the heat dissipation performance is further improved, and the cross-sectional area of the current passing region in the bus bar can be further reduced. . Moreover, it does not accompany a substantial increase in installation space.

  In addition, if the assembled battery bus bar according to the present invention includes a second upright portion formed at an edge other than the lateral edge of the first region at the edge of the bottom plate portion, a substantial installation space can be obtained. Without increasing, the heat dissipation performance is improved. As a result, the cross-sectional area of the current passing region in the bus bar can be further reduced. In addition, a 1st standing part and a 2nd standing part may be formed in series, or may be formed separately.

  Further, in the battery pack bus bar, the voltage detection electric wire electrically connected to the bottom plate portion is often drawn to the side of the bottom plate portion. Therefore, it is preferable that a chipped portion communicating from the inside to the outside is formed as a path of the voltage detection electric wire between the first standing portion and the second standing portion or a part of the second standing portion. . In addition, since a 1st standing part is a part of electric current passage area | region, it is not preferable to provide the chip | tip part which causes the increase in electrical resistance in a 1st standing part.

  Further, in the bus bar module including a plurality of battery pack bus bars according to the present invention, it is preferable that the first standing portion is formed upright at a height equal to or lower than the height of the enclosure of the bus bar housing portion. . As a result, it is possible to prevent an excessive increase in the temperature of the bus bar while suppressing an increase in weight and installation space according to the magnitude of transmitted power.

It is a disassembled perspective view of the principal part of the bus-bar module 1 which concerns on 1st Embodiment of this invention. 3 is a plan view of a main part of the bus bar module 1. FIG. It is a top view of the bus-bar module 1 attached to the assembled battery. It is a disassembled perspective view of the principal part of the bus-bar module 2 which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<First Embodiment>
First, the configuration of the main part of the bus bar module 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. For convenience, in FIGS. 1 and 2, half-dotted hatching is written in portions where openings are formed in the members constituting the bus bar module 1.

  As shown in FIGS. 1 and 2, the bus bar module 1 includes a plurality of bus bars 10, a plurality of bus bar holders 50 provided for each bus bar 10, and a plurality of voltage detection harnesses 60. The bus bar module 1 is mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle, and is attached to an assembled battery 9 including a plurality of battery cells 8 (see FIG. 3).

<Bus bar>
The bus bar 10 is connected to each of two electrodes 81 (positive electrode and negative electrode) of two adjacent battery cells 8 among the plurality of battery cells 8 included in the assembled battery 9, and electrically connects the two electrodes 81. It is a bus bar for assembled batteries to be connected to. The bus bar 10 is a conductor member made of a metal such as copper. Further, the surface layer of the bus bar 10 may be plated with tin plating or the like. The plurality of battery cells 8 in the assembled battery 9 are electrically connected in series by a plurality of bus bars 10.

  As shown in FIG. 1, the bus bar 10 is a member in which a bottom plate portion 11 and an upright portion 13 are integrally formed. The bottom plate portion 11 is a plate-like portion in which two holes 12 into which two electrodes 81 of adjacent battery cells 8 are inserted are formed. Further, the standing portion 13 is formed in a series of plate-like shapes standing on each side edge of the entire first region A1 extending from the position of one hole 12 to the position of the other hole 12 in the bottom plate portion 11. It is the part which was done.

  A thread is formed on the electrode 81 of the battery cell 8, and a bus bar 10 is attached to the electrode 81 by attaching a nut (not shown) to the electrode 81 passed through the hole 12 of the bottom plate portion 11. Connected.

  As shown in FIG. 1, in the present embodiment, a region extending from the center position of one hole 12 to the center position of the other hole 12 in the bottom plate portion 11 is defined as a first region A1. The first region A1 is a region through which a current flowing from one to the other of the two electrodes 81 inserted into each of the two holes 12 in the bottom plate portion 11 passes. Moreover, the area | region of both the outer sides of 1st area | region A1 in the baseplate part 11, ie, the area | region which extends to each both ends from each center position of the two holes 12 in the baseplate part 11, is defined as 2nd area | region A2.

  In addition, 1st area | region A1 means the area | region through which an electric current mainly passes in the baseplate part 11. FIG. Therefore, the first region A1 basically means a region extending from the center position of one hole 12 to the center position of the other hole 12, as shown in FIG. The position of the boundary line at both ends of A1 may be defined as a position slightly deviated inward or outward from the center position of each of the two holes 12.

  The bus bar 10 shown in FIG. 1 has a bottom plate portion 11 and an upright portion 13 formed by punching and bending a single flat metal member. In addition, as for the bus bar 10, it is also considered that the bottom plate part 11 and the standing part 13 are formed by metal mold forming.

  In addition, the first upright portion 13 of the bus bar 10 is formed with a height equal to or lower than the height of the surrounding portion 21 that surrounds the bus bar 10 in the bus bar accommodating portion 20 in a state where it is accommodated in the bus bar accommodating portion 20 described later. ing. That is, the first upright portion 13 is formed with a height that does not protrude from the bus bar accommodating portion 20 in the state accommodated in the bus bar accommodating portion 20.

  For example, in a state where the bus bar 10 is attached to the assembled battery 9, the first upright portion 13 is formed with a height equivalent to the height of the tip portion of the electrode 81 of the battery cell 8 that is passed through the hole 12 of the bottom plate portion 11. Has been.

  In the bus bar 10, the bottom plate portion 11 and the upright portion 13 may be formed with different thicknesses in addition to being formed with the same thickness. Further, the upright portion 13 may be formed in a corrugated plate shape in addition to being formed in a flat plate shape as shown in FIG.

<Harness for voltage detection>
The voltage detection harness 60 is a wire harness that is electrically connected to the electrode 81 of each battery cell 8 in order to detect the voltage at the electrode 81 of each battery cell 8 of the assembled battery 9. The voltage detection harness 60 includes a terminal 61 connected to the electrode 81 of the battery cell 8 and an electric wire 64 connected to the terminal 61. Further, a hole 62 into which the electrode 81 of the battery cell 8 is inserted is formed at the center of the terminal 61. In addition, a crimping portion 63 is formed at the edge of the terminal 61, and the end of the electric wire 64 is fixed and electrically connected to the core wire of the electric wire 64.

  As shown in FIG. 2, the terminal 61 of the voltage detection harness 60 is overlapped with the bus bar 10 and connected to the electrode 81 of the battery cell 8. That is, the terminal 61 in the voltage detection harness 60 is overlaid on the bus bar 10 so that the position of the hole 62 matches the position of the one hole 12 in the bus bar 10.

  In the voltage detection harness 60, the crimping portion 63 that is a connection portion with the electric wire 64 is provided at a position biased with respect to the position of the hole 62 in the terminal 61. As a result, as shown in FIG. 2, the electric wires 64 of the voltage detection harness 60 are pulled out from the bus bar housing portion 20 through a path that does not interfere with the standing portion 13 of the bus bar 10.

<Bus bar holder>
The bus bar holder 50 is a protector for the bus bar 10 provided for each bus bar 10 and having the bus bar accommodating portion 20 for individually accommodating the bus bar 10. The bus bar holder 50 is a non-conductive member in which the bus bar accommodating portion 20, the coupling mechanism 30, and the electric wire holding portion 40 are formed.

  The bus bar holder 50 is an integrally molded member made of non-conductive resin such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin. Therefore, the bus bar accommodating portion 20, the coupling mechanism 30, and the electric wire holding portion 40 are all non-conductive members. It is also conceivable that the bus bar holder 50 is not a non-conductive member. For example, the bus bar holder 50 may be a member in which an insulating coating is applied to the surface of a conductive member.

  The bus bar accommodating portion 20 includes a support portion 22 that supports the bus bar 10 and a surrounding portion 21 that is formed upright around the bus bar 10 supported by the support portion 22. The enclosure 21 forms a first opening 23 that is an insertion port for the electrode 81 of the battery cell 8 and a second opening 24 that is an inlet of the bus bar 10. The support portion 22 protrudes from the inner surface of the enclosure portion 21 and is formed so as to surround the first opening 23. Accordingly, the support portion 22 supports the edge portion of the bottom plate portion 11 in the bus bar 10.

  Further, a bus bar locking portion 25 that is hooked on an edge portion of the bus bar 10 placed on the support portion 22 is formed on the inner surface of the enclosure portion 21 so as to protrude. The bus bar engaging portion 25 abuts on the edge of the upper surface of the bottom plate portion 11 of the bus bar 10 placed on the support portion 22 on the side opposite to the lower surface supported by the support portion 22. Thereby, the bus bar locking part 25 prevents the bus bar 10 from being lifted from the support part 22.

  Further, a lid locking portion 27 that is hooked by a lid member (not shown) that closes the second opening 24 of the bus bar housing portion 20 is also formed on the inner surface of the enclosure portion 21. The lid locking portion 27 holds a lid member (not shown) in a state of closing the second opening 24.

  Further, the enclosure portion 21 is formed with a chipped portion 26 that communicates from the inside to the outside of the bus bar housing portion 20. The chipped portion 26 is formed at a position that does not face the upright portion 13 of the bus bar 10 in the bus bar accommodating portion 20. The chipped portion 26 forms a part of the wiring path of the electric wire 64 of the voltage detection harness 60 drawn from the inside to the outside of the enclosure portion 21.

  The connection mechanism 30 in the bus bar holder 50 is a mechanism for connecting the bus bar holder 50 to another bus bar holder 50 arranged next to the bus bar holder 50. In the example shown in FIG. 1, the coupling mechanism 30 includes a rod-shaped protrusion 31 having a wide retaining portion formed at the tip and a receiving portion 32 having a groove into which the protrusion 31 is fitted. Has been. The protrusion 31 is formed to extend in the direction in which the bus bar holder 50 is arranged. As shown in FIG. 2, the two bus bar holders 50 are connected by fitting the shaft portion of one protrusion 31 of two adjacent bus bar holders 50 into the groove of the other receiving part 32.

  Further, as shown in FIG. 3, the three or more bus bar holders 50 are sequentially connected by the connecting mechanism 30, so that the entire three or more bus bar holders 50 that connect the electrodes 81 for one row are integrated. Connected to In addition, among the electrodes 81 of the plurality of battery cells 8 electrically connected in series, the ground level electrode and the maximum potential electrode hold a bus bar in which one hole corresponding to each of them is formed. A bus bar holder 70 for a single electrode is attached. The bus bar holder 70 includes the same mechanism as the connecting mechanism 30 of the bus bar holder 50 and is connected to the bus bar holder 50 located at the end among the connected bus bar holders 50.

  Further, in the state where the protrusion 31 is fitted in the groove of the receiving portion 32, the protrusion 31 extends in the groove of the receiving portion 32 along the longitudinal direction of the protruding portion 31, that is, along the arrangement direction of the bus bar holder 50. The length is slidable. By this sliding mechanism, an error between the interval between the plurality of electrodes 81 and the dimension of the bus bar holder 50 in the assembled battery 9 is absorbed.

  The electric wire holding portion 40 in the bus bar holder 50 is a portion that supports only the electric wires 64 drawn from one bus bar accommodating portion 20. The electric wire holding part 40 has a first electric wire support part 41, a second electric wire support part 42, a first electric wire holding part 43, a second electric wire holding part 44 and a connecting part 45.

  The first electric wire support portion 41 exists at a position outside the chipped portion 26 of the enclosure portion 21 in the bus bar accommodating portion 20, and is an electric wire drawn from the bus bar accommodating portion 20 in a direction orthogonal to the arrangement direction of the bus bar holders 50. 64 is a portion that supports 64. As shown in FIG. 2, the first electric wire support portion 41 supports only the electric wires 64 drawn from each of the plurality of bus bar accommodating portions 20.

  Further, the second electric wire support portion 42 is a portion that supports the electric wires 64 drawn from the first electric wire support portion 41 along the arrangement direction of the bus bar holders 50. As shown in FIGS. 2 and 3, when the plurality of bus bar holders 50 are connected by the connecting mechanism 30, the plurality of second electric wire support portions 42 included in the bus bar holders 50 are connected to each other. In the range over the bus bar holder 50, the wiring path of the electric wire 64 is formed. And the 2nd electric wire support part 42 supports the some electric wire 64 pulled out from each of the some harness 60 for voltage detection.

  The first electric wire pressing portion 43 is a portion that is hooked from above with respect to the electric wires 64 supported by the first electric wire support portion 41. The second electric wire pressing portion 44 is a portion that is hooked from above with respect to the electric wires 64 supported by the second electric wire support portion 42. The first electric wire holding portion 43 and the second electric wire holding portion 44 are portions that prevent the electric wire 64 from being detached from the support portion.

  The connecting portion 45 is a portion that connects the enclosure portion 21 of the bus bar accommodating portion 20 and the second electric wire support portion 42. In addition, the 1st electric wire support part 41 also fulfill | performs the function which connects the enclosure part 21 and the 2nd electric wire support part 42. FIG.

  In the bus bar 10 of the bus bar module 1, the first region A1 extending from one to the other of the two holes 12 into which the electrodes 81 are inserted is a region through which a current flowing between the two electrodes 81 passes. The area affects the calorific value. In the bus bar 10, a region obtained by combining the first region A <b> 1 of the bottom plate portion 11 and the side upright portions 13 is a region through which a current flowing between the two electrodes 81 passes.

  Moreover, the area | region which combined 1st area | region A1 of the baseplate part 11 and the standing part 13 of the side is compared with 1st area | region A1 of the baseplate part 11 corresponded to the conventional bus bar, length, width, and cutting | disconnection. When the areas are equal, the surface area becomes large.

  By the way, the bus bar 10 is taller than the conventional flat bus bar by the height of the upright portion 13. However, the bus bar 10 is used in a state in which the electrode 81 extending from the battery cell 8 is inserted into the hole 12. Therefore, in a state where the bus bar module 1 is attached to the assembled battery 9, the upper portion of the edge portion of the bottom plate portion 11 is an empty space in the bus bar accommodating portion 20. Therefore, in a state where the bus bar 10 is attached to the assembled battery 9, the height of the tip portion of the standing portion 13 is equal to or less than the height of the tip portion of the electrode 81 of the battery cell 8, that is, the height of the enclosure portion 21. If it exists, the increase in the installation space by the standing part 13 being provided substantially does not arise.

  As described above, the bus bar 10 in the bus bar module 1 is superior in heat dissipation performance and does not substantially increase the installation space as compared with the conventional flat bus bar. Therefore, the bus bar 10 has a smaller cross-sectional area in the case where the substantial installation space and the temperature condition reached by the balance between heat generation and heat dissipation are equivalent to those of the conventional flat bus bar. Can do. That is, by adopting the bus bar 10, it is possible to prevent an excessive increase in temperature while suppressing an increase in weight and installation space according to the magnitude of transmitted power.

  Further, in the bus bar 10, two upright portions 13 are formed on both side edges of the first region A <b> 1 in the bottom plate portion 11. In this case, compared with the case where the standing portion 13 is formed only at one side edge of the first region A1, the heat dissipation performance is further improved, and the cross-sectional area of the current passing region in the bus bar 10 can be further reduced. It becomes. Moreover, it does not accompany a substantial increase in installation space. Depending on the temperature condition required for the bus bar 10, a configuration in which the standing portion 13 is formed only at one side edge of the first region A1 in the bottom plate portion 11 is also conceivable.

Second Embodiment
Next, the bus bar module 2 according to the second embodiment of the present invention and the bus bar 10A included in the bus bar module 2 will be described with reference to FIG. For the sake of convenience, in FIG. 4, halftone dots are indicated in the portions where the openings are formed in the members constituting the bus bar module 2.

  The bus bar module 2 according to the second embodiment has a configuration in which only the shape of the bus bar is different from the bus bar module 1 shown in FIG. 4, the same components as those shown in FIG. 1 are given the same reference numerals. Hereinafter, only the differences between the bus bar module 2 and the bus bar module 1 will be described.

  The bus bar 10A is a conductive member in which the bottom plate portion 11, the first upright portion 13, and the second upright portion 14 are integrally formed. Here, the bottom plate portion 11 and the first standing portion 13 in the bus bar 10 </ b> A are the same portions as the bottom plate portion 11 and the first standing portion 13 in the bus bar 10.

  Further, in the bus bar 10 </ b> A, the second standing portion 14 is a portion that is formed standing on a part of the edge of the second region A <b> 2 in the bottom plate portion 11. In the example shown in FIG. 4, the second upright portion 14 includes a portion formed in a part of the edge in the second region A <b> 2 of the bottom plate portion 11 and the first upright portion 13. And a portion formed separately.

  In the bus bar 10 </ b> A, a chipped portion 15 that communicates from the inside to the outside of the bus bar 10 </ b> A between the portion of the second standing portion 14 formed separately from the first standing portion 13 and the first standing portion 13. Is formed. And the chip | tip part 26 formed in a part of the enclosure part 21 in the bus-bar accommodating part 20 is formed in the position connected with the chip | tip part 15 of 10 A of bus bars.

  The chipped portion 15 of the bus bar 10 </ b> A and the chipped portion 26 of the surrounding portion 21 are part of the wiring path of the electric wire 64 drawn out from the terminal 61 of the voltage detection harness 60 superimposed on the bottom plate portion 11 to the outside of the surrounding portion 21. Form.

  Note that the chipped portion 15 of the bus bar 10 </ b> A may be formed in a part of the second upright portion 14. For example, the chipped portion 15 of the bus bar 10 </ b> A includes a second standing portion 14 formed continuously with the first standing portion 13 and another second standing portion 14 formed separately from the second standing portion 14. It is thought that it is formed between.

  When the bus bar 10A in the bus bar module 2 shown in FIG. 4 is employed, the same operations and effects as when the bus bar 10 in the bus bar module 1 is employed are obtained.

  Further, in a bus bar module for an assembled battery mounted on a vehicle, the voltage detection electric wire 64 electrically connected to the bottom plate portion 11 is often drawn out to the side of the bottom plate portion 11. Therefore, a chipped portion 15 communicating from the inside to the outside is formed as a path of the voltage detecting wire 64 between the first standing portion 13 and the second standing portion 14 or at a part of the second standing portion 14. It is preferable. In addition, since the 1st standing part 13 is a part of electric current passage area | region, it is not preferable to provide the chip | tip part 15 which causes the increase in electrical resistance in the 1st standing part 13.

  In addition, the bus bar 10A is substantially installed by including the second upright portion 14 formed at the edge of the second region A2 other than the side edge of the first region A1 at the edge of the bottom plate portion 11. Without increasing space, heat dissipation performance is improved. As a result, the cross-sectional area of the current passing region in the bus bar 10A can be further reduced.

  In addition, the 2nd standing part 14 may be formed in series with respect to the 1st standing part 13, or may be formed separately. In addition to being formed in a flat plate shape as shown in FIG. 4, the second upright portion 14 may be formed in a corrugated plate shape, or may be formed in a plurality of rod shapes.

1, 2 Busbar module A1 First area of the bottom plate (current passing area)
A2 Second region of bottom plate portion 8 Battery cell 9 Battery pack 10, 10A Bus bar 11 Bottom plate portion 12 Hole in bottom plate portion 13 Standing portion (first standing portion)
14 Second standing part 15 Bus bar notch part 20 Bus bar accommodating part 21 Enclosing part of bus bar accommodating part 22 Support part of bus bar accommodating part 23 First opening of bus bar accommodating part 24 Second opening of bus bar accommodating part 25 Bus bar locking part 26 Enclosure notch 27 Lid locking part 30 Connection mechanism 31 Projection part 32 Receiving part 40 Electric wire holding part 41 First electric wire support part 42 Second electric wire support part 43 First electric wire holding part 44 Second electric wire holding part 45 Connecting part DESCRIPTION OF SYMBOLS 50 Busbar holder 60 Voltage detection harness 61 Terminal 62 Hole 63 Crimp part 64 Electric wire 81 Battery cell electrode

Claims (8)

A battery pack bus bar composed of a conductor that electrically connects the electrodes of two adjacent battery cells included in the battery pack,
A plate-like bottom plate portion in which two holes into which the electrodes are inserted are formed;
A first standing part formed in a series of plate-like shapes on the side edge of the entire first region extending from the position of one of the holes in the bottom plate part to the position of the other hole. An assembled battery bus bar comprising:   2. The assembled battery bus bar according to claim 1, wherein the first upright portion is formed on both side edges of the first region in the bottom plate portion.   3. The assembled battery bus bar according to claim 2, further comprising a second upright portion formed upright on a part or the whole of an edge portion of the second region which is a region other than the first region in the bottom plate portion. .   4. The assembled battery bus bar according to claim 3, wherein a chipped portion communicating from the inside to the outside is formed between the first standing portion and the second standing portion or at a part of the second standing portion. A plurality of bus bars that electrically connect the electrodes of two adjacent battery cells in an assembled battery including a plurality of battery cells;
A bus bar module comprising a plurality of bus bar housing portions each of which is provided for each bus bar, and includes a support portion that supports the bus bar and a surrounding portion that is formed upright around the bus bar.
A plate-shaped bottom plate part that forms part of the bus bar and has two holes into which the electrodes are inserted;
A portion of the bus bar is formed, and a height of the enclosure portion of the bus bar accommodating portion is formed on a side edge of the first region extending from the position of one hole in the bottom plate portion to the position of the other hole. A bus bar module comprising: a first upright portion that rises at a height of less than the height and is formed in a series of plate shapes.   6. The bus bar module according to claim 5, wherein the first upright portion is formed on both side edges of the first region in the bottom plate portion. The bus bar
The bus bar module according to claim 6, further comprising a second upright portion formed upright on a part or the whole of an edge portion of the second region which is a region other than the first region in the bottom plate portion. A first chipped portion that communicates from the inside to the outside is formed between the first standing portion and the second standing portion in the bus bar or in a part of the second standing portion,
The bus bar module according to claim 7, wherein a second chipped portion that communicates with the first chipped portion of the bus bar is formed in the enclosure portion of the bus bar housing portion.

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