JP2015022798A - Bus bar module device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar module device 6 which becomes advantageous in cost by reducing man-hours for assembly to a battery assembly 3 and becomes appropriate for on-vehicle packaging by enabling prompt assembly in a simple structure.SOLUTION: A positive pole 2a of one battery 2 and a negative pole 2b of another battery 2 are electrically connected by a simple operation of folding a flexible substrate 5 along a folding line 8A and overlapping a sub conductive foil 8 on a main conductive foil 7 via a bus bar 15 in a conductible manner. Thus, man-hours for assembling a bus bar module device 6 to a battery assembly 3 are reduced, and the bus bar module device 6 becomes advantageous in cost and can be promptly assembled in a simple structure. By folding the flexible substrate 5 along the folding line 8A, the sub conductive foil 8 is covered together with the bus bar 15 and can be protected from a foreign substance such as external dust.

Description

  The present invention relates to a bus bar module device that connects a plurality of batteries to form a battery assembly.

  For example, in an electric vehicle or a hybrid vehicle that travels by using an engine and an electric motor together, a power supply device that functions as a drive source for the electric motor is mounted.

  This power supply device forms a battery assembly in which a plurality of batteries are arranged in parallel, and the positive electrode of one battery adjacent to the battery assembly and the negative electrode of the other battery are electrically connected by a bus bar. Thereby, the some battery is connected in series and the bus-bar module apparatus which can supply a high voltage is comprised (for example, refer patent document 1, 2).

  In Patent Document 1, a flat cable is arranged in the region of the insulating frame, a cut is made between the conductor wires of the flat cable, and each conductor wire separated one by one is bent at a substantially right angle and connected to a predetermined bus bar by welding. ing. An electronic control unit (ECU) connected to each conductor wire detects the voltage between the electrodes of each battery in the battery assembly, and controls the voltage of each battery to be a predetermined value or less.

  In Patent Document 2, a flat electric wire is provided adjacent to a plurality of bus bars, is connected to the bus bar main body, and includes a connecting portion that is overlapped with the flat electric wire and connected to one conductor. As a result, the necessity of making a cut in the covering portion between the conductors of the flat wire and the need to bend each conductor of the flat wire are eliminated, and the inconvenience of Patent Document 1 is compensated.

JP 2010-1114025 A JP 2012-109196 A

  In Patent Document 1, a positive terminal and a negative terminal of a battery are connected by a bus bar, and resistance of a contact surface of the bus bar with respect to the positive terminal and the negative terminal is reduced so that a voltage drop does not occur. In addition, it is possible to connect and wire each conductor wire of the flat cable to the bus bar with the shortest distance, and the high voltage detection bus bar module device can be miniaturized.

  Although patent document 1 has such an advantage, it is necessary to cut | incis between the conductor wires of a flat cable, bend each conductor wire, and to weld it to a bus bar. For this reason, when connecting the conductor wire of a flat cable to a bus bar, a man-hour increases and it is easy to take time.

  In Patent Document 2, although the inconvenience of Patent Document 1 is compensated, it is necessary to fix the connecting portion to the conductor by ultrasonic bonding, and there is an inconvenience that the number of assembling steps increases. In addition, the bus bar needs multiple parts such as indent, bus bar accommodating part, electric wire accommodating part, accommodating chamber, partition wall, mounting wall, concave part and convex part, and the bus bar itself has a complicated structure, which may increase the manufacturing cost. is there.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the number of assembling steps for the battery assembly, which is advantageous in terms of cost, and can be quickly assembled with a simple structure, which is mounted on a vehicle. An object of the present invention is to provide a bus bar module device suitable for use.

(About claim 1)
A battery assembly in which a plurality of batteries are arranged side by side has a flexible base that is attached so as to connect a plurality of batteries in series by electrically connecting the positive electrode of one adjacent battery and the negative electrode of the other battery. In the bus bar module device, the flexible base includes a conductive foil group including a main conductive foil and a sub conductive foil, and a crease line.

  The main conductive foil is attached so as to be attached to either the positive electrode of one battery or the negative electrode of the other battery.

  The subconductive foil is stuck so as to correspond to the positive electrode of one battery and the negative electrode of the other battery. The crease line is formed between the main conductive foil line and the sub conductive foil.

  The conductive bus bar is provided so as to conduct between the positive electrode of one battery and the negative electrode of the other battery via the main conductive foil.

  When the flexible base is attached to the battery assembly, the flexible base is folded along the crease line, and the secondary conductive foil is conductively overlapped with the bus bar. The positive electrode of the battery is electrically connected to the negative electrode of the other battery.

  In claim 1, the flexible substrate is bent along the crease line, and the sub-conductive foil is conductively overlapped with the main conductive foil via the bus bar so that the positive electrode of the one battery and the other of the battery can be electrically connected. The negative electrode of the battery is electrically connected.

  As a result, the number of steps for assembling the bus bar module device to the battery assembly can be reduced, which is advantageous in terms of cost, and the bus bar module device has a simple structure and can be quickly assembled.

  When the flexible base is attached to the battery assembly, the sub-conducting foil can be covered with the bus bar and protected from foreign matters such as external dust by bending the flexible base along the crease line.

Since the bus bar module device has a simple structure and is advantageous in terms of cost, it is suitable as a bus bar module device mounted on a vehicle for mass production.
(About claim 2)
A battery assembly in which a plurality of batteries are arranged side by side has a flexible base that is attached so as to connect a plurality of batteries in series by electrically connecting the positive electrode of one adjacent battery and the negative electrode of the other battery. In the bus bar module device, the flexible base includes a conductive foil group including a first main conductive foil, a second main conductive foil, and a sub conductive foil, and a crease line.

  The first main conductive foil is stuck so as to be attached to the positive electrode of one battery. The second main conductive foil is attached so as to be attached to the negative electrode of the other battery. The crease line is formed between both the first main conductive foil and the second main conductive foil and the sub conductive foil.

  When attaching the flexible substrate to the battery assembly, the flexible substrate is bent along the crease line, and the sub-conducting foil is conductively superimposed on both the first main conductive foil and the second main conductive foil. Thus, the first main conductive foil and the second main conductive foil are conducted through the sub conductive foil, and the positive electrode of one battery and the negative electrode of the other battery are electrically connected.

  In claim 2, the flexible base is bent along the crease line, and the sub-conducting foil is conductively overlapped with both the first main conducting foil and the second main conducting foil. The positive electrode of the battery and the negative electrode of the other battery are electrically connected.

  Thus, as in claim 1, the number of steps for assembling the bus bar module device to the battery assembly can be reduced, which is advantageous in terms of cost, and the bus bar module device has a simple structure and can be quickly assembled. It becomes.

  When attaching the flexible base to the battery assembly, the sub-conducting foil is covered with the first main conductive foil and the second main conductive foil by bending the flexible base along the crease line, and external dust or the like It can protect against foreign matter.

Since the bus bar module device has a simple structure and is advantageous in terms of cost, it is suitable as a bus bar module device mounted on a vehicle for mass production.
(Claim 3)
The first main conductive foil and the second main conductive foil are electrically connected by a conductive bus bar, and the sub conductive foil is connected to both the first main conductive foil and the second main conductive foil via the bus bar. Superposed so as to be conductive. Thus, the first main conductive foil and the second main conductive foil are conducted through the sub conductive foil and the bus bar.

In claim 3, since the sub-conductive foil is superposed on both the first main conductive foil and the second main conductive foil via the bus bar so as to be conductive, the first main conductive foil and the second main conductive foil are Is conducted through the sub-conducting foil and the bus bar. As a result, the first main conductive foil and the second main conductive foil are conducted with low resistance and high electrical conductivity, and the positive electrode of one battery and the negative electrode of the other battery are electrically connected without a voltage drop.
(About claim 4)
The flexible substrate has a polyurethane layer, an adhesive layer, and a polyethylene terephthalate layer laminated in close contact with each other, and the conductive foil group is bonded onto the polyurethane layer. The adhesive layer and the polyethylene terephthalate layer are detachably attached to the polyurethane layer and the conductive foil group.

According to the fourth aspect, when the battery assembly is assembled, the adhesive layer and the polyethylene terephthalate layer can be peeled from the polyurethane layer and the conductive foil group to expose the conductive foil group to the outside.
(Claim 5)
The thickness of the polyurethane layer is 10-20 μm, the thickness of the adhesive layer is 5-15 μm, the thickness of the polyethylene terephthalate layer is 40-60 μm, the conductive foil group is made of copper oxide, and the thickness is 10-25 μm. It is.

According to the fifth aspect, since the thickness of the polyurethane layer, the adhesive layer, the polyethylene terephthalate layer, and the conductive foil group is reduced, the thickness of the flexible substrate can be reduced to achieve compactness.
(About claim 6)
The flexible substrate is formed with a plurality of notches parallel to the streak line from the sub-conducting foil to the main conducting foil, which is possible due to the difference in expansion between the flexible substrate and the conductive foil group as the temperature rises. Absorbs strain generated in flexible substrates.

According to the sixth aspect, since the distortion generated in the flexible base due to the difference in expansion is absorbed by the cut portion, the flexible base does not bend and deform inadvertently.
(About claim 7)
The flexible substrate is formed with a plurality of incisions in parallel to the streaks from the sub-conductive foil to the first main conductive foil and the second main conductive foil. Absorbs strain generated in the flexible substrate due to a difference in expansion from the foil group.

In the seventh aspect, similarly to the sixth aspect, since the distortion generated in the flexible base due to the difference in expansion is absorbed by the cut portion, the flexible base does not deform abnormally.
(About claim 8)
An electrically insulating belt-like body in which a plurality of fitting holes are formed at equal intervals in the longitudinal direction is provided, and the bus bar is integrally fitted and fixed to the fitting holes.

In claim 8, the bus bar is integrated with the belt-like body. For this reason, by attaching the belt-like body to the battery assembly, it is not necessary to attach the bus bar to the flexible substrate one by one, which can further contribute to the quick assembly of the bus bar module device.
(About claim 9)
The flexible substrate has a polyurethane layer, an adhesive layer, and a polyethylene terephthalate layer laminated in close contact with each other, and the conductive foil group is bonded onto the polyurethane layer. The adhesive layer and the polyethylene terephthalate layer are detachably attached to the polyurethane layer and the conductive foil group, and the crease line is formed by attaching a crease in which the polyurethane layer bends along a predetermined virtual line. Bending wrinkles in the direction of the main conductive foil are given.

  According to a ninth aspect of the present invention, when the adhesive layer and the polyethylene terephthalate layer are bonded to the polyurethane layer, the polyurethane layer is spread against the urging force of the bending wrinkles to form a flat surface. At this time, when the adhesive layer and the polyethylene terephthalate layer are peeled off from the polyurethane layer and the conductive foil group, the polyurethane layer is bent in the direction of the main conductive foil along the crease line by the urging force of the bending wrinkles.

(Example 1) which is a disassembled perspective view which shows each member of a battery assembly, resin-made cases, a bus-bar module apparatus, and an insulation coating cover. (A)-(c) is a perspective view of the part of the ellipse E shown in FIG. 1, and shows the procedure which connects the conductive foil of a flexible base | substrate to an insulation connector (Example 1). (A) is a partially omitted enlarged front view of the flexible substrate, (b) is an enlarged longitudinal sectional view taken along the line KK of (a) (Example 1). (Example 1) which is an enlarged partial front view of a flexible base | substrate. (Example 1) which is a perspective view which shows the aspect which bends a flexible base | substrate along a bending line. (Example 1) which is a front view which shows the bus-bar module apparatus attached to the battery assembly. It is an expansion partial front view of a flexible base | substrate (Example 2). (Example 2) which is a perspective view which shows the aspect which bends a flexible base | substrate along a bending line. (A) is a perspective view which shows the strip | belt-shaped body integrated with the bus-bar, (b) is an expanded longitudinal cross-sectional view which follows the JJ line | wire of (a) (Example 3). (Example 4) which is an enlarged partial front view of a flexible base | substrate.

  In the present invention, the positive electrode of one battery and the negative electrode of the other battery are electrically connected by a simple operation such as bending the flexible base along the crease line and superimposing the auxiliary conductive foil on the bus bar. This is a technical feature.

[Configuration of Example 1]
A first embodiment of the present invention will be described with reference to FIGS. A power supply device 1 shown in FIG. 1 is mounted on an electric vehicle, a hybrid vehicle, or the like, and is provided so as to drive a conductive motor (not shown). In the power supply device 1, a plurality of thin rectangular batteries 2 are arranged in parallel along the left-right direction N as a single secondary battery and stacked to form a battery assembly 3 having a box-shaped outer shell as a whole. (Cell single row laminate).

  Each battery 2 is arranged so as to have each polarity in the front-rear direction M of the battery assembly 3. On one side surface 3a of the battery assembly 3, the positive electrode 2a of one adjacent battery 2 and the negative electrode 2b of the other battery 2 are alternately arranged in a line along the left-right direction N in a state of being opposite to each other. Yes. The positive electrode 2a and the negative electrode 2b protrude from the one side surface 3a of the battery assembly 3 in the front-rear direction M as small-diameter male screw bolt portions.

  The horizontally long insulating resin case 4 is provided with a first through hole 4a and a second through hole 4b corresponding to the positive electrode 2a and the negative electrode 2b, respectively. A vertical wall portion 4c protruding in the vertical direction from the side surface is integrally formed on both sides sandwiching both the first through hole 4a and the second through hole 4b except for the leftmost end portion and the rightmost end portion of the resin case 4. ing.

  The flexible substrate 5 constitutes a bus bar module device 6 as a flexible printed circuit (FPC) together with a bus bar 15 and a nut 18 which will be described later, and is formed in an elongated strip shape corresponding to the resin case 4. As shown in FIG. 3A, the flexible substrate 5 has a conductive foil group 9 including a main conductive foil 7 and a subconductive foil 8. As an example in this case, the main conductive foil 7 has a keyhole shape, and the sub conductive foil 8 has a rectangular shape. FIG. 3A shows a state in which an adhesive layer 5b and a polyethylene terephthalate layer 5c, which will be described later, are omitted. However, it is assumed that the adhesive layer 5b and the polyethylene terephthalate layer 5c are attached.

  The main conductive foil 7 is attached so as to be attached to either the positive electrode 2a of one battery 2 or the negative electrode 2b of the other battery 2, for example, the positive electrode 2a. The subconducting foil 8 is attached to a position corresponding to both the positive electrode 2 a of one battery 2 and the negative electrode 2 b of the other battery 2.

  The crease line 8 </ b> A is formed between the main conductive foil 7 and the subconductive foil 8 over the entire length in the longitudinal direction H of the flexible substrate 5 (for example, a polyurethane layer 5 a described later).

  In attaching the crease line 8A to the flexible substrate 5, the polyurethane layer 5a is folded and then spread to give a crease line, or a roller (not shown) is applied to make a narrow line, A cut with a mark may be provided.

  The main conductive foil 7 and the sub conductive foil 8 constituting the conductive foil group 9 are made of, for example, oxygen-free copper having high electrical conductivity.

  From each main conductive foil 7, a thin wire-like conductor foil 7a-7o extends along the extended side 5A of the flexible substrate 5, and is inserted into the insulating connector F as shown in FIGS. 2 (a)-(c). The connection is fixed by the retainer Fa. The insulation connector F is extended and connected to an electronic control unit (ECU) (not shown), and the voltage of each battery 2 is controlled by the electronic control unit (ECU) so as not to have a value larger than a predetermined value.

  As shown in FIG. 3B, the flexible substrate 5 has a polyurethane layer 5a, an adhesive layer 5b, and a polyethylene terephthalate layer 5c laminated in close contact with each other, and the conductive foil group 9 is formed on the polyurethane layer 5a. It is stuck. The adhesive layer 5b and the polyethylene terephthalate layer 5c are detachably attached to the polyurethane layer 5a and the conductive foil group 9.

  As an example, the thickness of the polyurethane layer 5a is 15 μm (thickness range of 10-20 μm), the thickness of the adhesive layer 5b is 10 μm (thickness range of 5-15 μm), and the thickness of the polyethylene terephthalate layer 5c is 50 μm ( 40-60 μm thickness range), and the thickness of the conductive foil group 9 made of copper oxide is 18 μm (10-25 μm thickness range).

  A first hole 10 corresponding to the positive electrode 2a of the battery 2 and the first through hole 4a of the resin case 4 is formed through the main conductive foil 7 and the polyurethane layer 5a of the flexible substrate 5 (FIG. 4). reference). A portion of the polyurethane layer 5 a adjacent to the main conductive foil 7 is formed with a second hole portion 11 corresponding to the negative electrode 2 b of the battery 2 and the second through hole 4 b of the resin case 4.

  The flexible substrate 5 is formed with a plurality of cut portions 12 that are parallel to the line R extending from the sub conductive foil 8 to the main conductive foil 7 and correspond to the vertical wall portion 4c of the resin case 4. The strain generated in the flexible substrate 5 due to the difference in expansion between the flexible substrate 5 and the conductive foil group 9 as the temperature rises is absorbed.

  A first insertion hole 13 and a second insertion hole 14 that are symmetrical with the first hole portion 10 and the second hole portion 11 with respect to the crease line 8A are formed through the sub-conductive foil 8 and the polyurethane layer 5a. .

  The plurality of bus bars 15 are made of a conductive short side plate group formed of, for example, oxygen-free copper, and as shown in FIG. 5, first through holes respectively corresponding to the first insertion hole 13 and the second insertion hole 14. 15a and the second through hole 15b are formed in the longitudinal direction S.

  In the above configuration, before attaching the flexible substrate 5 to the battery assembly 3, the adhesive layer 5b and the polyethylene terephthalate layer 5c are peeled off from the polyurethane layer 5a and the conductive foil group 9 to expose the conductive foil group 9 to the outside (FIG. 3 (a)).

  In this state, as indicated by an arrow P in FIG. 5, the secondary conductive foil 8 is folded inward along the crease line 8 </ b> A so that the bus bar 15 is sandwiched between the secondary conductive foil 8 and the main conductive foil 7. To place. Thereafter, the auxiliary conductive foil 8 is pressed against the main conductive foil 7 via the bus bar 15 and overlapped.

  Next, the cut portion 12 of the flexible base 5 is inserted into the vertical wall portion 4 c of the resin case 4, and the flexible base 5 is temporarily fixed to the resin case 4.

  When the sub conductive foil 8 is bent, a first communication path 16 is formed in which the second through hole 4b, the first hole 10, the second through hole 15b, and the first insertion hole 13 communicate with each other in a straight line. At the same time, a second communication path 17 is formed in which the first through hole 4a, the second hole portion 11, the first through hole 15a, and the second insertion hole 14 are communicated in a straight line.

  In this case, both of the positive electrode 2a of the battery 2 positioned at the leftmost end of the battery assembly 3 and the negative electrode 2b of the battery 2 positioned at the rightmost end of the battery assembly 3 include a positive power cable 19 and a negative power supply described later. The bus bar 15 is not interposed for the connection of the cable 20. A main conductive foil 7 having a second hole portion 11 communicating with the second insertion hole 14 is attached to a portion corresponding to the negative electrode 2 b located at the rightmost end of the flexible substrate 5.

  The resin case 4 is put on one side 3a of the battery assembly 3, and the positive electrode 2a and the negative electrode 2b of the battery 2 are inserted into the first through hole 4a and the second through hole 4b, respectively. Thereby, the front-end | tip part of the positive electrode 2a penetrates the 1st communicating path 16, and protrudes outside, The front-end | tip part of the negative electrode 2b penetrates the 2nd communicating path 17, and protrudes outside.

  The positive electrode 2 a of the battery 2 located at the leftmost end of the battery assembly 3 protrudes to the outside through the first through hole 4 a, the first hole portion 10, and the first insertion hole 13. The negative electrode 2b of the battery 2 located at the rightmost end of the battery assembly 3 protrudes to the outside through the second through hole 4b, the second hole portion 11, and the second insertion hole 14.

  At this time, the positive electrode 2a is in contact with the inner peripheral edge of the first hole portion 10 to be electrically connected to the main conductive foil 7, and is in contact with the inner peripheral edge of the second through hole 15b to be electrically connected to the bus bar 15 and the first insertion. It contacts the inner peripheral edge of the hole 13 and is electrically connected to the auxiliary conductive foil 8.

  The negative electrode 2 b comes into contact with the inner peripheral edge of the first through hole 15 a and is electrically connected to the bus bar 15, and comes into contact with the inner peripheral edge of the second insertion hole 14 and is electrically connected to the auxiliary conductive foil 8.

  A nut 18 is fastened to the tip of the positive electrode 2a protruding from the first communication passage 16 and the tip of the negative electrode 2b protruding from the second communication passage 17 (see FIG. 6). As a result, the auxiliary conductive foil 8 is pressed and brought into close contact with the main conductive foil 7 via the bus bar 15, and in this state, the bus bar module device 6 having the flexible base 5 is integrated with the resin case 4 to form a battery. Attached to and fixed to one side surface 3 a of the assembly 3.

  When the secondary conductive foil 8 overlaps and adheres to the main conductive foil 7 via the bus bar 15, the positive electrode 2 a of one battery 2 and the negative electrode 2 b of the other battery 2 are electrically connected via the bus bar 15 and the secondary conductive foil 8. Conducted to.

  A positive power cable 19 is connected to the positive electrode 2a of the battery 2 located at the leftmost end of the battery assembly 3 using a nut 18, and the negative electrode 2b of the battery 2 located at the rightmost end of the battery assembly 3 is connected to The negative power cable 20 is connected using the nut 18.

  At this time, a plurality of batteries 2 are electrically connected in series, and the power supply device 1 that generates a high voltage between the positive power cable 19 and the negative power cable 20 is obtained.

A resin insulation cover 21 is detachably attached to the resin case 4, and the flexible base 5 of the bus bar module device 6, the bus bar 15, the nut 18, the positive power cable 19 and the negative power cable 20 are connected. Cover and protect (see FIGS. 1 and 5).
[Effect of Example 1]
In Example 1, the flexible substrate 5 is bent along the crease line 8A, and the sub-conductive foil 8 is conductively overlapped with the main conductive foil 7 via the bus bar 15, so that one battery 2 can be electrically connected. The positive electrode 2a and the negative electrode 2b of the other battery 2 are electrically connected.

  As a result, the number of steps for assembling the bus bar module device 6 to the battery assembly 3 can be reduced, which is advantageous in terms of cost, and the bus bar module device 6 has a simple structure and can be quickly assembled.

  When the flexible substrate 5 is attached to the battery assembly 3, the flexible substrate 5 is bent along the crease line 8A to cover the sub-conductive foil 8 together with the bus bar 15 to protect it from foreign matters such as external dust. be able to.

  Since the bus bar module device 6 has a simple structure and is advantageous in terms of cost, it is suitable as the bus bar module device 6 mounted on a vehicle for mass production.

  Since the thicknesses of the polyurethane layer 5a, the adhesive layer 5b, the polyethylene terephthalate layer 5c and the conductive foil group 9 constituting the flexible substrate 5 are set small, the flexible substrate 5 can be made compact.

  Since the plurality of cut portions 12 are formed in the flexible base 5, distortion generated in the flexible base 5 due to the difference in expansion is absorbed by the cut portions 12, so that the flexible base 5 is inadvertently bent. There is no deformation.

  When the flexible substrate 5 is attached to the battery assembly 3, the nut 18 is fastened to the positive electrode 2 a (negative electrode 2 b), and therefore the positive electrode 2 a (negative electrode 2 b), the auxiliary conductive foil 8, the bus bar 15, and the main conductive foil are used. 7 and nut 18 are firmly attached. For this reason, the electrical resistance of the tatami heavy conductive path through the positive electrode 2a (negative electrode 2b), the auxiliary conductive foil 8, the bus bar 15, the main conductive foil 7 and the nut 18 is greatly reduced, and high conductivity is ensured in the tatami heavy conductive path. Thus, the voltage drop can be prevented from occurring.

  Note that the crease line 8A may be provided with a bending crease along the imaginary line, for example, by bending the polyurethane layer 5a along a predetermined imaginary line. In this case, when the adhesive layer 5b and the polyethylene terephthalate layer 5c are adhered to the polyurethane layer 5a, the polyurethane layer 5a is spread out against the urging force of the bending wrinkles to form a flat surface. At this time, when the adhesive layer 5b and the polyethylene terephthalate layer 5c are peeled off from the polyurethane layer 5a and the conductive foil group 9, the polyurethane layer 5a is directed in the direction of the main conductive foil 7 along the crease line 8A by the urging force of the bending wrinkles. It will bend.

Further, in Example 1, the main conductive foil 7 was attached in correspondence with the positive electrode 2a of the battery 2, but conversely, the main conductive foil 7 was attached in correspondence with the negative electrode 2b of the battery 2. Good.
[Configuration of Example 2]
7 and 8 show a second embodiment of the present invention. Example 2 differs from Example 1 in that instead of the main conductive foil 7, a first main conductive foil 22 and a second main conductive foil 23 are provided as shown in FIG.

  The first main conductive foil 22 and the second main conductive foil 23 form a conductive foil group 9 together with the sub conductive foil 8, and the first main conductive foil 22 is formed on the polyurethane layer 5a and on the positive electrode 2a of one battery 2. It is stuck so that it can be attached.

  The second main conductive foil 23 is stuck on the polyurethane layer 5a so as to be attached to the negative electrode 2b of the other battery 2. From the first main conductive foil 22 and the second main conductive foil 23, thin conductor foils 22c and 23c are extended to the extended side 5A in the same manner as in the first embodiment.

  The polyurethane layer 5a and the first main conductive foil 22 are formed with a first hole 22a communicating with the first communication path 16, and the polyurethane layer 5a and the second main conductive foil 23 are connected to the second communication path 17. The 2nd hole 23a which connects is penetrated and formed. The first hole 22a corresponds to the first hole 10 of the first embodiment, and the second hole 23a corresponds to the second hole 11 of the first embodiment.

  When the positive electrode 2 a is inserted through the first communication path 16 and the negative electrode 2 b is inserted through the second communication path 17, the positive electrode 2 a contacts the inner peripheral edge of the first hole 22 a and is electrically connected to the first main conductive foil 22. And while contacting the inner peripheral edge of the 1st through-hole 15a, it is electrically connected with the bus-bar 15, and it contacts the inner peripheral edge of the 1st penetration hole 13, and is electrically connected with the subconductive foil 8. FIG.

  The negative electrode 2b is in contact with the inner peripheral edge of the second hole portion 23a to be electrically connected to the second main conductive foil 23, and is in contact with the inner peripheral edge of the second through hole 15b to be electrically connected to the bus bar 15, and the second insertion hole 14 is brought into contact with the inner peripheral edge of the auxiliary conductive foil 8 and brought into conduction.

  The crease line 8 </ b> A is formed along a longitudinal direction H that partitions the space between the first main conductive foil 22 and the second main conductive foil 23 and the sub conductive foil 8 in the vertical direction. The flexible substrate 5 is formed with a plurality of notches 12 extending from the sub conductive foil 8 to the first main conductive foil 22 and the second main conductive foil 23.

  In Example 2, as shown in FIG. 8, when the flexible substrate 5 is bent along the crease line 8 </ b> A, a conductive bus bar is provided between the first main conductive foil 22 and the second main conductive foil 23. 15 is conducted. For this reason, the auxiliary conductive foil 8 overlaps both the first main conductive foil 22 and the second main conductive foil 23 via the bus bar 15 so as to be conductive.

  As a result, the first main conductive foil 22 and the second main conductive foil 23 are conducted through the bus bar 15 and the sub conductive foil 8, and the positive electrode 2a of one battery 2 and the negative electrode 2b of the other battery 2 are electrically connected. Is done.

The first main conductive foil 22 corresponding to the positive electrode 2a of the battery 2 was attached to the rightmost end of the flexible substrate 5 in Example 2. Therefore, the second main conductive foil 23 corresponding to the negative electrode 2b of the battery 2 located at the leftmost end of the battery assembly 3 is attached to the leftmost end of the flexible substrate 5.
[Effect of Example 2]
In the second embodiment, the flexible substrate 5 is bent along the crease line 8A, and the sub conductive foil 8 is superposed in a conductive manner on both the first main conductive foil 22 and the second main conductive foil 23. In operation, the positive electrode 2a of one battery 2 and the negative electrode 2b of the other battery 2 are electrically connected.

  As a result, as in the first embodiment, the number of man-hours for assembling the bus bar module device 6 to the battery assembly 3 can be reduced, which is advantageous in terms of cost, and the bus bar module device 6 has a simple structure and can be quickly assembled. Can be attached.

  When the flexible substrate 5 is attached to the battery assembly 3, the flexible substrate 5 is bent along the crease line 8 </ b> A to cover the sub-conductive foil 8 together with the first main conductive foil 22 and the second main conductive foil 23. In addition, it can protect against foreign matters such as external dust.

  Since the bus bar module device 6 has a simple structure and is advantageous in terms of cost, it is suitable as the bus bar module device 6 mounted on a vehicle for mass production.

  The first main conductive foil 22 and the second main conductive foil 23 are conducted through both the sub conductive foil 8 and the bus bar 15. As a result, the resistance between the first main conductive foil 22 and the second main conductive foil 23 becomes low resistance, and electrical conduction is made at a high conductivity, so that the positive electrode 2a of one battery 2 and the negative electrode 2b of the other battery 2 are substantially connected. Electrical connection without causing a significant voltage drop.

  For this reason, even if a high current (for example, 30 Amp) flows between the positive electrode 2a of the battery 2 and the negative electrode 2b of the other battery 2, the conductive path between the positive electrode 2a and the negative electrode 2b is not excessively heated. It is safe.

  In Example 2, the bus bar 15 is omitted, and when the flexible substrate 5 is bent, the sub conductive foil 8 is directly superimposed on both the first main conductive foil 22 and the second main conductive foil 23, The first main conductive foil 22 and the second main conductive foil 23 may be electrically connected only by the conductive foil 8.

  Further, in the step of peeling the adhesive layer 5b and the polyethylene terephthalate layer 5c from the polyurethane layer 5a and the conductive foil group 9, the adhesive layer 5b corresponding to one of the first main conductive foil 22 and the second main conductive foil 23 and The polyethylene terephthalate layer 5c may be left without peeling by being surrounded by a resectable line such as a perforation line or a cut line.

That is, one of the first main conductive foil 22 and the second main conductive foil 23 may not be exposed, and either one may be left covered with the adhesive layer 5b and the polyethylene terephthalate layer 5c. In this case, since the bus bar 15 is indispensable, when the flexible substrate 5 is bent, the sub conductive foil 8 is overlapped on one of the first main conductive foil 22 or the second main conductive foil 23 with the bus bar 15 in the middle. In addition, the positive electrode 2a of the battery 2 and the negative electrode 2b of the other battery 2 are made conductive by the bus bar 15 and the auxiliary conductive foil 8.
[Configuration of Example 3]
FIG. 9 shows a third embodiment of the present invention. The third embodiment differs from the first embodiment in that the bus bar 15 is integrated with the electrically insulating band 25.

  The belt-like body 25 has a thin and long rectangular shape, and a plurality of fitting holes 25a are formed at equal intervals in the longitudinal direction. The bus bar 15 is integrally fitted and fixed in the fitting hole 25a (see FIGS. 9A and 9B). The belt-like body 25 is formed of, for example, a polyamide (PA) or a synthetic resin of polyester as an electrically insulating material.

  In the third embodiment, the bus bar 15 is fitted and fixed in the fitting hole 25 a of the strip 25 and integrated with the strip 25. For this reason, by attaching the strip 25 to the battery assembly 3, it is not necessary to attach the bus bars 15 to the flexible substrate 5 one by one, which can further contribute to the quick assembly of the bus bar module device 6.

The bus bar 15 may be integrated with the band 25 by synthetic resin insert molding. The band 25 is made of polyamide (PA) or polyester, and synthetic resins include polyimide, polyamideimide, polyacetal, polycarbonate (PC), polyphenylene ether (PPE), polybutylene terephthalate (PBT), polyethylene terephthalate (PET). ), Polyethylene (PE), polytetrafluoroethylene (PTFE), or syndiotactic polystyrene (SPS). Moreover, you may select a desired thing from the said plastic material as a resin material of each layer which comprises the flexible base | substrate 5. FIG.
[Configuration of Example 4]
FIG. 10 shows a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in that the start end portion 12a of the cut portion 12 is formed so as not to open to the outside.

  In the fourth embodiment, the cut portion 12 has a start end portion 12a and a terminal end portion 12b, and a plurality of sub-conducting foils 8 arranged on the left and right are integrally connected. For this reason, when the flexible substrate 5 is bent along the crease line 8 </ b> A, an advantage is obtained in which a plurality of sub-conducting foils 8 arranged on the left and right simultaneously overlap the main conductive foil 7.

In this case, with respect to the start end portion 12a and the end portion 12b of the cut portion 12, the first distance Q1 between the crease line 8A and the start end portion 12a and the second distance Q2 between the crease line 8A and the end portion 12b are set. You may set equally. In this distance setting, when the flexible substrate 5 is bent along the crease line 8A, an advantage is obtained that the start end portion 12a and the end portion 12b are matched and folded.
[Modification]
(A) In Example 1-3, the conductive foil group 9 and the bus bar 15 are formed of oxygen-free copper. However, the conductive foil group 9 and the bus bar 15 are not limited to oxygen-free copper, and may be copper in a normal refined state. Alternatively, a conductive metal such as aluminum or nickel alloy may be used. Although the main conductive foil 7 has a keyhole shape and the sub conductive foil 8 has a rectangular shape, the shapes of the main conductive foil 7 and the sub conductive foil 8 may be variously changed according to the use situation and application target.
(B) Although the conductive foil group 9 is illustrated as a spotted pattern, it is for facilitating identification from a blank portion, and does not specify the material used for the conductive foil group 9. The crease line 8A may be formed not only on the polyurethane layer 5a of the flexible substrate 5, but also on the entire adhesive layer 5b including the polyurethane layer 5a and the polyethylene terephthalate layer 5c.
(C) When the crease line 8A is formed over the entire flexible substrate 5 as in the latter case, the flexible substrate 5 is bent along the crease line 8A during manufacture, and the folded product is put on the market as a finished product. You may ship.

The crease line 8A may be formed by making a cut having a V-shaped cross section in the polyurethane layer 5a, and the polyurethane layer 5a may be bent with the cut as the back surface.
(D) In Example 1-3, before the flexible substrate 5 was bent, the adhesive layer 5b and the polyethylene terephthalate layer 5c were removed from the conductive foil group 9 and removed. However, the adhesive layer 5b and the polyethylene terephthalate layer 5c were removed. An excisable line such as a perforation is formed in advance in the application area corresponding to the conductive foil group 9 and only the application area is peeled off from the conductive foil group 9 when the flexible substrate 5 is bent. May be.
(E) The first conductive foil 22 and the second conductive foil 23 in the second embodiment may be integrally connected by a conductive foil side portion (not shown) to be conducted. In this case, since the positive electrode 2a and the negative electrode 2b of the battery 2 are conducted through the first conductive foil 22, the conductive foil side portion, and the second conductive foil 23, both the bus bar 15 and the sub conductive foil 8 are omitted. Good.
(F) The flexible substrate 5 is not limited to the polyurethane layer 5a, the adhesive layer 5b, and the polyethylene terephthalate layer 5c, and is a synthetic resin layer formed by selecting from plastic materials used for the band 25 of Example 3. Also good.
(G) In the third embodiment, instead of the belt-like body 25, an insulating connecting side portion that connects adjacent bus bars 15 among the plurality of bus bars 15 may be provided.

  In the present invention, the positive electrode of one battery and the other battery can be easily operated by bending the flexible substrate along the crease line and conductively superimposing the sub-conductive foil on the main conductive foil with respect to the bus bar. Are electrically connected to the negative electrode. As a result, the number of steps for assembling the bus bar module device to the battery assembly can be reduced, which is advantageous in terms of cost, and the bus bar module device has a simple structure and can be quickly assembled. Demand from related businesses focusing on these usefulness is aroused and contributes to the machinery industry through the distribution of related parts.

DESCRIPTION OF SYMBOLS 1 Power supply device 2 Battery 2a Battery positive electrode 2b Battery negative electrode 3 Battery assembly 5 Flexible base 5a Polyurethane layer 5b Adhesive layer 5c Polyethylene terephthalate layer 6 Busbar module device 7 Main conductive foil 8 Subconductive foil 9 Conductive foil group 10 First 1 hole 11 second hole 12 notch 15 bus bar 22 first main conductive foil 23 second main conductive foil 22a first hole 23a second hole 25 band 25a fitting hole H longitudinal direction of flexible base N Left-right direction of assembly M Front-back direction of assembly R Muscle line

Claims (9)

A flexible base that is attached so as to connect the plurality of batteries in series by electrically connecting a positive electrode of one adjacent battery and a negative electrode of the other battery of a battery assembly in which a plurality of batteries are arranged in parallel. In a bus bar module device having
The flexible base is
A main conductive foil attached to be attached to one of the positive electrode of the one battery and the negative electrode of the other battery, and attached so as to correspond to the positive electrode of the one battery and the negative electrode of the other battery. A conductive foil group composed of the attached secondary conductive foil;
A crease line formed between the main conductive foil wire and the sub conductive foil;
Provided a conductive bus bar attached so as to conduct between the positive electrode of the one battery and the negative electrode of the other battery through the main conductive foil,
When the flexible base is attached to the battery assembly, the flexible base is bent along the crease line, and the sub-conductive foil is conductively overlapped with the bus bar so that the bus bar and the A bus bar module device, wherein the positive electrode of the one battery and the negative electrode of the other battery are electrically connected and electrically connected via a sub-conductive foil. A flexible base that is attached so as to connect the plurality of batteries in series by electrically connecting a positive electrode of one adjacent battery and a negative electrode of the other battery of a battery assembly in which a plurality of batteries are arranged in parallel. In a bus bar module device having
The flexible base is
A first main conductive foil attached to be attached to the positive electrode of the one battery; a second main conductive foil attached to be attached to the negative electrode of the other battery; and the first main conductive foil; A conductive foil group composed of sub-conductive foils attached to correspond to both of the second main conductive foils; and between the first main conductive foil and the second main conductive foil and the sub-conductive foil. And a crease line formed on the
When the flexible base is attached to the battery assembly, the flexible base is bent along the crease line, and the sub-conducting foil is made to both the first main conductive foil and the second main conductive foil. Thus, the first main conductive foil and the second main conductive foil are conducted through the sub conductive foil, and the positive electrode of the one battery and the negative electrode of the other battery are electrically connected. A bus bar module device connected.   The first main conductive foil and the second main conductive foil are electrically connected by a conductive bus bar, and the first main conductive foil and the second main conductive are connected to the sub conductive foil via the bus bar. 3. The first main conductive foil and the second main conductive foil are electrically connected to each other through the sub conductive foil and the bus bar by superimposing conductively on both of the foils. The bus bar module device described.   The flexible substrate has a polyurethane layer, an adhesive layer, and a polyethylene terephthalate layer laminated in close contact with each other, and the conductive foil group is stuck on the polyurethane layer, and the adhesive layer and the polyethylene terephthalate The bus bar module device according to claim 1, wherein the layer is detachably attached to the polyurethane layer and the conductive foil group.   The polyurethane layer has a thickness of 10-20 μm, the adhesive layer has a thickness of 5-15 μm, the polyethylene terephthalate layer has a thickness of 40-60 μm, and the conductive foil group is made of non-oxidized copper. The bus bar module device according to claim 4, wherein is 10-25 μm.   In the flexible base, a plurality of incisions are formed in parallel to the lines from the sub-conducting foil to the main conductive foil, and as the temperature rises, the flexible base and the conductive foil group The bus bar module device according to claim 1, wherein the bus bar module device absorbs strain generated in the flexible substrate due to an expansion difference.   The flexible base is formed with a plurality of incisions in parallel to the lines from the sub conductive foil to the first main conductive foil and the second main conductive foil. The bus bar module device according to claim 2, wherein distortion generated in the flexible base due to a difference in expansion between the conductive base and the conductive foil group is absorbed.   2. An electrically insulating belt-like body in which a plurality of fitting holes are formed at equal intervals in the longitudinal direction is provided, and the bus bar is integrally fitted and fixed to the fitting hole. Or the bus-bar module apparatus of Claim 3.   The flexible substrate has a polyurethane layer, an adhesive layer, and a polyethylene terephthalate layer laminated in close contact with each other, and the conductive foil group is stuck on the polyurethane layer, and the adhesive layer and the polyethylene terephthalate The layer is detachably attached to the polyurethane layer and the conductive foil group, and the crease line is formed by attaching a crease in which the polyurethane layer bends along a predetermined virtual line. The bus bar module device according to claim 1, wherein bending bars in the direction of the main conductive foil are provided.

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