JP7087353B2 - Battery pack - Google Patents

Description

The disclosures described herein relate to battery packs with batteries.

As shown in Patent Document 1, a lithium ion storage battery, a plurality of switches, and a battery unit in which a control unit is housed in a housing are known.

The battery unit is provided with a first terminal to which the lead-acid battery and the electric load are connected, a second terminal to which the rotary machine is connected, and a third terminal to which the electric load is connected as external terminals.

Further, in the battery unit, as the electric path in the unit, a first connection path connecting the first terminal and the second terminal and a second connection path connecting the first connection path and the lithium ion storage battery are provided. .. Further, the battery unit is provided with a third connection path connecting the first connection path and the third terminal, and a fourth connection path connecting the second connection path and the third connection path.

These plurality of connection paths have different connection targets. Therefore, the amount of energization of each of the plurality of connection paths is different. A plurality of switches are provided for each of the plurality of connection paths. Therefore, the energization amount of each of the plurality of switches is also different.

JP-A-2015-153676

As described above, in the battery unit shown in Patent Document 1, switches are provided for each of a plurality of connection paths having different energization amounts. And each of these switches has a plurality of MOSFETs. These plurality of MOSFETs are collectively provided for each connection path. Therefore, there is a difference in the amount of heat generated by the plurality of MOSFETs provided in each connection path. As a result, the life of the plurality of MOSFETs (switches) may vary.

Therefore, it is an object of the disclosure described in the present specification to provide a battery pack in which variation in the life of a plurality of switches is suppressed.

One of the disclosures is that there are multiple current paths (23-25, 50-54) and
A plurality of energization control units (30 to 36) provided in each of the plurality of current paths, and
A battery (10) connected to at least one of a plurality of current paths, and
It has a mounting unit (21, 91) that mounts a plurality of energization control units.
Each of the plurality of energization control units has a plurality of switches (61 to 74) connected in at least one of parallel connection and series connection.
The mounting portion has a plurality of mounting areas (21a, 21b, 93a, 93b) in which switches are provided.
The switches of each of the plurality of energization control units are distributed and arranged in each of the plurality of mounting areas so that the switches of the different energization control units are arranged in one mounting area .
Each mounting area is a part where a switch is provided, and includes a heat radiating part provided at a position separated from each other.
The switches of different energization control units are arranged alternately in the mounting unit .

According to this, a plurality of switches (61 to 74) provided in different current paths (23 to 25, 50 to 54) are distributed and arranged in each of the plurality of mounting areas (21a, 21b, 93a, 93b). Therefore, the total amount of heat generated by the plurality of switches (61 to 74) provided in each of the plurality of mounting areas (21a, 21b, 93a, 93b) is made uniform. As a result, unlike the configuration in which all the switches of the energization control unit provided in the current path having a large energization amount are provided in the same mounting area, the calorific value is generated in a specific mounting area (21a, 21b, 93a, 93b). Is suppressed from becoming high. As a result, it is possible to prevent variations in the life of the switches (61 to 74) of the plurality of energization control units (30 to 36).

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope at all.

It is a circuit diagram for demonstrating a power supply system. It is a perspective view for demonstrating the structure of a battery pack. It is a schematic diagram for demonstrating the arrangement in the housing of the 1st switch and the 2nd switch which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the deformation example of the bottom wall. It is a schematic diagram for demonstrating the deformation example of the bottom wall. It is a schematic diagram for demonstrating the modification of the arrangement of the 1st switch and the 2nd switch. It is a schematic diagram for demonstrating the deformation example of the bottom wall. It is a schematic diagram for demonstrating the arrangement of the 3rd switch and the 4th switch which concerns on 2nd Embodiment on the wiring board. It is a schematic diagram for demonstrating the modification of the wiring board. It is a schematic diagram for demonstrating the arrangement in the housing of the energization control part. It is a circuit diagram for demonstrating the modification of the battery pack. It is a circuit diagram for demonstrating the modification of the battery pack.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
The battery pack 100 according to the present embodiment and the power supply system 200 including the battery pack 100 will be described with reference to FIGS. 1 to 3.

<Overview of power supply system>
The power supply system 200 is mounted on the vehicle. The power supply system 200 is composed of a plurality of in-vehicle devices mounted on the vehicle and a battery pack 100. There is a lead storage battery 110 as one of the in-vehicle devices. The battery pack 100 has an assembled battery 10. The power supply system 200 constructs a dual power supply system by the lead storage battery 110 and the assembled battery 10.

Another in-vehicle device is the engine 140. The vehicle equipped with the power supply system 200 has an idle stop function of stopping the engine 140 when a predetermined stop condition is satisfied and restarting the engine 140 when a predetermined start condition is satisfied.

As shown in FIG. 1, the power supply system 200 includes a starter motor 120, a rotary electric machine 130, an electric load 150, an upper ECU 160, and an MGE ECU 170 in addition to the lead storage battery 110 and the engine 140 described above. The lead-acid battery 110, the starter motor 120, and the electric load 150 are each electrically connected to the battery pack 100 via the first wire harness 210. The rotary electric machine 130 is electrically connected to the battery pack 100 via the second wire harness 220.

The upper ECU 160 and the MG ECU 170 are electrically connected to each of the lead storage battery 110 and the battery pack 100 via wiring (not shown). Similarly, various other ECUs mounted on the vehicle are also electrically connected to the lead-acid battery 110 and the battery pack 100 via wiring (not shown).

As shown above, the power supply system 200 constructs a dual power supply system using two power sources, a lead storage battery 110 and a battery pack 100 (assembled battery 10).

<Components of power supply system>
The lead-acid battery 110 generates an electromotive voltage by a chemical reaction. The lead-acid battery 110 has a larger storage capacity than the assembled battery 10. The lead storage battery 110 corresponds to an external power source.

The starter motor 120 starts the engine 140. The starter motor 120 is mechanically connected to the engine 140 when the engine 140 is started. The rotation of the starter motor 120 causes the crankshaft of the engine 140 to rotate. When the rotation speed of the crankshaft of the engine 140 exceeds a predetermined rotation speed, atomized fuel is injected from the fuel injection valve into the combustion chamber. At this time, sparks are generated by the spark plug. As a result, the fuel explodes and the engine 140 begins to rotate autonomously. The propulsive force of the vehicle is obtained by the power of the engine 140. When the engine 140 starts to rotate autonomously, the mechanical connection between the starter motor 120 and the engine 140 is released.

The rotary electric machine 130 performs power running and power generation. An inverter (not shown) is connected to the rotary electric machine 130. This inverter is electrically connected to the second wire harness 220. The rotary electric machine 130 corresponds to the load.

The inverter converts the DC voltage supplied from at least one of the lead-acid battery 110 and the assembled battery 10 of the battery pack 100 into an AC voltage. This AC voltage is supplied to the rotary electric machine 130. As a result, the rotary electric machine 130 runs power.

The rotary electric machine 130 is connected to the engine 140. The rotary electric machine 130 and the engine 140 can mutually transmit rotational energy via a belt or the like. The rotational energy generated by the power running of the rotary electric machine 130 is transmitted to the engine 140. This promotes the rotation of the engine 140. As a result, vehicle running is assisted. As described above, the vehicle equipped with the power supply system 200 has an idle stop function. The rotary electric machine 130 not only assists the vehicle running, but also functions to rotate the crankshaft when the engine 140 is restarted.

The rotary electric machine 130 also has a function of generating power by at least one of the rotational energy of the engine 140 and the rotational energy of the wheels of the vehicle. The rotary electric machine 130 generates an AC voltage by power generation. This AC voltage is converted into a DC voltage by the inverter. This DC voltage is supplied to the battery pack 100, the lead storage battery 110, and the electric load 150, respectively.

The engine 140 produces propulsive force for the vehicle by driving the fuel by combustion. As described above, when the engine 140 is started, the crankshaft is rotated by the starter motor 120. However, when the engine 140 is stopped once by the idle stop and then restarted, if the above-mentioned predetermined starting conditions are satisfied, the crankshaft is rotated by the rotary electric machine 130.

The electrical load 150 has a general load 151 and a protective load 152. The general load 151 includes in-vehicle devices such as a seat heater, a blower fan, an electric compressor, a room light, and a headlight, which do not have to have a constant power supply. The protective load 152 includes motorized shift positions, motorized power steering (EPS), brakes (ABS), door locks, navigation systems, and in-vehicle devices such as audio that are required to have a constant power supply. The protective load 152 exemplified here has a property of switching from an on state to an off state when the supply voltage falls below the reset threshold value. The protective load 152 includes in-vehicle devices that are more relevant to vehicle travel than the general load 151.

The upper ECU 160 and the MG ECU 170 are one of various ECUs mounted on the vehicle. These various ECUs are electrically connected to each other via the bus wiring 161 to form an in-vehicle network. By coordinated control of various ECUs, combustion of the engine 140, power running of the rotary electric machine 130, power generation, and the like are controlled. The upper ECU 160 controls the battery pack 100. The MGECU 170 controls the rotary electric machine 130.

Although not shown, the power supply system 200 includes sensors for measuring physical quantities such as various voltages and currents, and vehicle information such as the amount of accelerator pedal depression and throttle valve opening, in addition to the above-mentioned in-vehicle devices. Have. The detection signals detected by these various sensors are input to various ECUs.

<Overview of battery pack>
As shown in FIG. 1, the battery pack 100 includes an assembled battery 10, a circuit board 20, an energization control unit 30, a sensor unit 40, and a power supply bus bar 50. Further, as shown in FIG. 2, the battery pack 100 has a pack case 90.

The assembled battery 10 is smaller in size and lighter in weight than the lead-acid battery 110. The assembled battery 10 has a property of having a higher energy density than the lead storage battery 110. The assembled battery 10 corresponds to a battery.

The circuit board 20 has a wiring board 21 and a BMU 22. A part of the energization control unit 30 and the BMU 22 are mounted on the wiring board 21. The rest of the energization control unit 30 and the assembled battery 10 are electrically connected to the circuit board 20 via the power supply bus bar 50. This constitutes the electric circuit of the battery pack 100. The sensor unit 40 is electrically connected to this electric circuit via an insulated wire or the like.

The electric circuit of the battery pack 100 is electrically connected to the external connection terminal indicated by the double circle in FIG. The external connection terminals include a first external connection terminal 100a, a second external connection terminal 100b, a third external connection terminal 100c, a fourth external connection terminal 100d, and a fifth external connection terminal 100e.

The first external connection terminal 100a, the fourth external connection terminal 100d, and the fifth external connection terminal 100e are electrically connected to the lead storage battery 110, the starter motor 120, and the electric load 150 via the first wire harness 210, respectively. Has been done. The second external connection terminal 100b is electrically connected to the rotary electric machine 130 via the second wire harness 220. The third external connection terminal 100c is bolted to the body of the vehicle. The bolt inserted into the third external connection terminal 100c functions to connect the battery pack 100 and the vehicle body. As a result, the battery pack 100 is body grounded.

As shown in FIG. 1, the first wire harness 210 is divided into one for connecting a lead storage battery 110, a starter motor 120, and a general load 151, and one for connecting a protective load 152. The end of the first wire harness 210 connecting the lead-acid battery 110, the starter motor 120, and the general load 151 is bifurcated. One of the bifurcated ends is connected to the first external connection terminal 100a, and the other is connected to the fifth external connection terminal 100e. The end of the first wire harness 210 connecting the protective load 152 is connected to the fourth external connection terminal 100d.

The pack case 90 has a housing 91 and a cover 92. A storage space is formed by the housing 91 and the cover 92. The assembled battery 10, the circuit board 20, the energization control unit 30, the sensor unit 40, and the power supply bus bar 50 are each housed in this storage space.

<Battery pack components>
Next, the components of the battery pack 100 will be described individually. In the following, the three directions orthogonal to each other are referred to as a horizontal direction, a vertical direction, and a height direction. The lateral direction is along the left-right direction of the vehicle. The height direction is along the top and bottom direction of the vehicle. When the vehicle is parked on a horizontal plane, the height direction is along the vertical direction. The horizontal and vertical directions are along the horizontal direction.

The assembled battery 10 has a plurality of battery cells connected in series, and a battery case 11 for accommodating these battery cells. Specifically, these battery cells are lithium ion batteries. Lithium-ion batteries generate electromotive voltage through a chemical reaction. Current flows through the battery cell due to the generation of electromotive voltage. As a result, the battery cell generates heat and generates gas. Therefore, the battery cell expands. The battery cell is not limited to the above example. For example, as the battery cell, a secondary battery such as a nickel hydrogen secondary battery or an organic radical battery can be adopted.

The battery cell has a rectangular parallelepiped shape. The battery cell has two main surfaces facing in the height direction. This main surface has a larger area than the other four surfaces. And the thickness between the two main surfaces is thin. As described above, the battery cell has a flat shape having a thin thickness in the height direction.

The assembled battery 10 of the present embodiment has five battery cells. Three of these five battery cells are stacked and arranged in the height direction to form a first battery stack. The remaining two battery cells are stacked and arranged in the height direction to form a second battery stack. These two battery stacks are side by side. The arrangement of these five battery cells is held by the battery case 11. The expansion of the battery case 11 due to the expansion of the battery cell is suppressed by the restraint plate 80 shown in FIG.

The battery case 11 has a main body made of resin and a conductive member provided on the main body. As the conductive member, there is a series connection terminal for connecting five battery cells in series. These series connection ends are brought into contact with the electrode terminals of the corresponding battery cells, and the two are welded and joined by a laser or the like in the contact state. As a result, five battery cells are connected in series.

Further, as the conductive member, in addition to the above-mentioned series connection terminal, the output terminal 12 connected to the positive electrode terminal of the battery cell located at the highest potential of the five series-connected battery cells and the output terminal 12 located at the lowest potential. There is a ground terminal 13 connected to the negative electrode terminal of the battery cell. The output terminal 12 is welded to the positive electrode terminal of the battery cell having the highest potential by a laser or the like. The ground terminal 13 is welded to the negative electrode terminal of the battery cell having the lowest potential by a laser or the like.

The battery case 11 is formed with a hole for passing a bolt. A bolt hole for fastening this bolt is formed in the housing 91 of the pack case 90. By passing bolts through these holes, the battery case 11 is fixed to the housing 91.

The battery case 11 is also fixed to the housing 91 by the restraint plate 80. The restraint plate 80 faces the housing 91 via the assembled battery 10 in the height direction. The restraint plate 80 is formed with a notch for passing a bolt. A bolt hole for fastening this bolt is formed in the housing 91. By passing bolts through the notches and bolt holes, the restraint plate 80 is fixed to the housing 91.

As described above, the circuit board 20 has a wiring board 21 and a BMU 22. The wiring board 21 is a printed circuit board in which a wiring pattern made of a conductive material is formed on an insulating substrate. A first feeder line 23, a second feeder line 24, and a third feeder line 25 are formed as wiring patterns on at least one of the surface and the inside of the insulating substrate. The wiring board 21 is fixed to the housing 91 via bolts or the like. The wiring board 21 (circuit board 20) is provided between the battery case 11 and the cover 92 in the height direction. Further, the wiring board 21 is provided side by side with the battery cell having the highest potential in the lateral direction. That is, the wiring board 21 is provided side by side with the battery cell located on the cover 92 side of the first battery stack in the lateral direction.

The wiring board 21 is formed with terminals that are electrically connected to the wiring pattern. The terminals include a first internal terminal 26a, a second internal terminal 26b, a third internal terminal 26c, and a fourth internal terminal 26d. Further, the wiring board 21 is provided with the above-mentioned fifth external connection terminal 100e. The fifth external connection terminal 100e is a connector. The fifth external connection terminal 100e is also electrically connected to the wiring pattern. The description of the electrical connection between these wiring patterns and the internal terminals and the fifth external connection terminal 100e will be described later when the circuit configuration of the battery pack 100 is described.

The energization control unit 30 includes a first energization control unit 31, a second energization control unit 32, a third energization control unit 33, a fourth energization control unit 34, a fifth energization control unit 35, and a sixth energization control unit 36. Have. The first energization control unit 31 and the second energization control unit 32 are mounted on the housing 91. The third energization control unit 33 and the fourth energization control unit 34, and the fifth energization control unit 35 and the sixth energization control unit 36 are each mounted on the wiring board 21.

Each of the first energization control unit 31 to the fourth energization control unit 34 has a semiconductor switch. Specifically, this semiconductor switch is an N-channel MOSFET. Therefore, each of the first energization control unit 31 to the fourth energization control unit 34 is closed by the input of the high level control signal. Each of the first energization control unit 31 to the fourth energization control unit 34 is opened by inputting a low-level control signal.

As the semiconductor switch included in the first energization control unit 31 to the fourth energization control unit 34, an IGBT or the like can also be adopted. In this case, a diode is connected in parallel to the IGBT.

The fifth energization control unit 35 and the sixth energization control unit 36 are mechanical relays, respectively. More specifically, the fifth energization control unit 35 and the sixth energization control unit 36 are normally closed electromagnetic relays. Therefore, each of the 5th energization control unit 35 and the 6th energization control unit 36 is opened by the input of the high level control signal. Each of the 5th energization control unit 35 and the 6th energization control unit 36 is closed by the input of the low level control signal. In other words, the fifth energization control unit 35 and the sixth energization control unit 36 are closed when the input of the high-level control signal is interrupted.

Each of the first energization control unit 31 to the fourth energization control unit 34 has at least one opening / closing unit in which two MOSFETs are connected in series. The source electrodes of these two MOSFETs are connected to each other. The gate electrodes of the two MOSFETs are electrically independent. MOSFETs have parasitic diodes. The parasitic diodes of the two MOSFETs are connected to each other by the anode electrodes. The gate electrode is electrically connected to the circuit board 20.

The first energization control unit 31 and the second energization control unit 32 have a plurality of opening / closing units. A plurality of opening / closing parts are connected in parallel. The source electrodes of the plurality of opening / closing parts are electrically connected to each other.

The third energization control unit 33 has one opening / closing unit. The fourth energization control unit 34 has a plurality of opening / closing units. A plurality of opening / closing units included in the fourth energization control unit 34 are connected in series.

FIG. 1 shows two opening / closing units connected in parallel to each of the first energization control unit 31 and the second energization control unit 32. Two opening / closing units connected in series of the fourth energization control unit 34 are shown. The number of these opening / closing portions can be appropriately determined according to the amount of current, redundancy, and the like.

Each of the first energization control unit 31 to the fourth energization control unit 34 has a resin portion that covers the opening / closing portion. This resin portion has a rectangular parallelepiped shape. The resin portion has a thin flat shape with a length (thickness) between the two main surfaces having the largest area.

Bolt holes penetrating the two main surfaces are formed in the resin portions of each of the first energization control unit 31 and the second energization control unit 32. The housing 91 is formed with mounting holes corresponding to the bolt holes of the resin portion. Bolts are fastened to the bolt holes in the resin portion and the mounting holes in the housing 91. As a result, the first energization control unit 31 and the second energization control unit 32 are fixed to the housing 91 and thermally connected.

As described above, the sensor unit 40 is electrically connected to the electric circuit. The sensor unit 40 has a sensor element that detects the state of each of the assembled battery 10 and the energization control unit 30. The sensor unit 40 has a temperature sensor, a current sensor, and a voltage sensor as sensor elements.

The sensor unit 40 detects the temperature, current, and voltage of the assembled battery 10. The sensor unit 40 outputs it to the BMU 22 as a status signal of the assembled battery 10. Further, the sensor unit 40 detects the temperature, current, and voltage of the energization control unit 30. The sensor unit 40 outputs it to the BMU 22 as a status signal of the energization control unit 30.

The sensor unit 40 has a submersion sensor in addition to the above-mentioned various sensors. This submersion sensor has two counter electrodes. If there is water between the two counter electrodes, the two counter electrodes will be energized. This changes the resistance between the two counter electrodes. This change in resistance is input to the BMU 22 as a state signal. The BMU 22 detects submersion of the battery pack 100 based on whether or not the change in resistance is continued for a predetermined time.

The BMU 22 controls the energization control unit 30 based on at least one of the state signal of the sensor unit 40 and the command signal from the host ECU 160. As described above, each of the first energization control unit 31 to the fourth energization control unit 34 has a plurality of semiconductor switches. For example, when the BMU 22 controls the opening and closing of the first energization control unit 31, all the semiconductor switches of the first energization control unit 31 are controlled to be in the closed state at the same time or in the open state at the same time. That is, the BMU 22 simultaneously inputs a high-level control signal or a low-level control signal to the gate electrodes of all the semiconductor switches of the first energization control unit 31. BMU is an abbreviation for battery management unit. The BMU 22 corresponds to the open / close control unit.

The BMU 22 determines the state of charge (SOC) of the assembled battery 10 and the abnormality of the energization control unit 30 based on the state signal of the sensor unit 40. SOC is an abbreviation for state of charge. The BMU 22 outputs these SOCs and signals (determination information) for determining an abnormality to the upper ECU 160.

The upper ECU 160 determines the control of the energization control unit 30 based on the determination information input from the BMU 22 and the vehicle information input from various other ECUs. Then, the upper ECU 160 outputs a command signal including the control of the determined energization control unit 30 to the BMU 22.

The BMU 22 controls the energization control unit 30 based on the command signal from the host ECU 160. When the BMU 22 determines that the battery pack 100 is submerged based on the status signal of the submersion sensor, the BMU 22 arbitrarily stops the output of the control signal to the energization control unit 30. As a result, the electrical connection of the assembled battery 10 is cut off. Further, the BMU 22 limits the driving of the energization control unit 30 when the energization control unit 30 becomes hot. That is, when the BMU 22 controls the pulse width of the semiconductor switch of the energization control unit 30, for example, the duty ratio is lowered. This shortens the energizing time of the semiconductor switch and suppresses its heat generation.

The feeding bus bar 50 is made of a conductive material such as copper. The power supply bus bar 50 can be manufactured, for example, by the methods listed below. The power supply bus bar 50 can be manufactured by bending one flat plate. The power supply bus bar 50 can be manufactured by integrally connecting a plurality of flat plates. The power supply bus bar 50 can be manufactured by welding a plurality of flat plates. The power supply bus bar 50 can be manufactured by pouring a conductive material in a molten state into a mold. The power supply bus bar 50 can also be manufactured by a manufacturing method different from the manufacturing methods listed above. The method for manufacturing the power supply bus bar 50 is not particularly limited. Furthermore, for example, an insulated wire can be adopted as the power supply bus bar 50.

The battery pack 100 has a first power supply bus bar 51, a second power supply bus bar 52, a third power supply bus bar 53, and a fourth power supply bus bar 54 as the power supply bus bar 50. The circuit board 20 and the assembled battery 10, and the circuit board 20 and the external connection terminal are electrically connected by these plurality of power supply bus bars. In FIG. 1, each of these feeding bus bars is shown to be thicker than the feeding line of the wiring board 21. These power supply bus bars are mounted on the resin holding portion 82 shown in FIG. The first power supply bus bar 51 to the fourth power supply bus bar 54 correspond to the wiring member.

As described above, the pack case 90 has a housing 91 and a cover 92. The housing 91 can be manufactured by die casting aluminum. The housing 91 can also be manufactured by pressing iron or stainless steel. The housing 91 has higher heat transfer performance than the wiring board 21. Therefore, the housing 91 has higher heat dissipation than the wiring board 21.

The housing 91 has a bottom wall 93 and a side wall 94 that rises from the bottom wall 93 in an annular shape. The opening is configured by the annular side wall 94. This opening is covered by the cover 92. This constitutes a storage space. The cover 92 is made of resin or metal.

Although not shown, a hole corresponding to the third external connection terminal 100c is formed in the bottom wall 93. Further, a flange 95 for connecting to the body of the vehicle is connected to the bottom wall 93. The flange 95 and the body of the vehicle are mechanically and thermally connected via bolts. As a result, the battery pack 100 is fixed to the vehicle.

The bottom wall 93 is formed with a first heat radiating portion 96 and a second radiating portion 97 locally protruding toward the cover 92 in the height direction. The first heat radiating unit 96 and the second heat radiating unit 97 are laterally separated from each other.

The first energization control unit 31 and the second energization control unit 32 are on the first upper surface 96a facing the height direction of the first heat radiating unit 96 and the second upper surface 97a facing the height direction of the second heat radiating unit 97, respectively. The mounting hole corresponding to the bolt hole of the resin part of the above is open. Bolts are fastened to these bolt holes and mounting holes. As a result, the first energization control unit 31 and the second energization control unit 32 are attached and fixed to the first heat radiation unit 96 and the second heat radiation unit 97. One of the two main surfaces of the resin portion is thermally connected to the upper surface of the heat radiating portion via the insulating film 81.

The pack case 90 (battery pack 100) of the present embodiment is provided below the seat of the vehicle. However, the arrangement of the battery pack 100 is not limited to this. The battery pack 100 may be arranged, for example, in the space between the rear seat and the trunk room, the space between the driver's seat and the passenger seat, and the like.

<Circuit configuration of battery pack>
Next, the circuit configuration of the battery pack 100 will be described. As shown in FIG. 1, the first external connection terminal 100a and one end of the first energization control unit 31 are electrically connected via the first power supply bus bar 51. A part of the first power supply bus bar 51 is branched. The branch portion 51a of the first power supply bus bar 51 is electrically connected to the first internal terminal 26a of the wiring board 21.

The other end of the first energization control unit 31 and the second external connection terminal 100b are electrically connected via the second power supply bus bar 52. A part of the second power supply bus bar 52 is branched. The branch portion 52a of the second power feeding bus bar 52 is electrically connected to one end of the second energization control unit 32.

Further, a part of the second power supply bus bar 52 is branched from the other end of the first energization control unit 31 and the connection portion between the branch portion 52a. The branch portion 52b is electrically connected to the fourth internal terminal 26d of the wiring board 21. The first power supply bus bar 51 and the second power supply bus bar 52 correspond to the first wiring member.

The other end of the second energization control unit 32 and the positive electrode of the assembled battery 10 are electrically connected via the third power supply bus bar 53. A part of the third power supply bus bar 53 is branched. The branch portion 53a of the third power supply bus bar 53 is electrically connected to the second internal terminal 26b of the wiring board 21. The negative electrode of the assembled battery 10 is electrically connected to the third external connection terminal 100c. The second power supply bus bar 52 and the third power supply bus bar 53 correspond to the second wiring member.

The first internal terminal 26a and the second internal terminal 26b of the wiring board 21 are electrically connected to each other via the first feeder line 23. The third energization control unit 33 and the fourth energization control unit 34 are connected in series to the first feeder line 23 in order from the first internal terminal 26a toward the second internal terminal 26b.

The third internal terminal 26c and the fourth internal terminal 26d of the wiring board 21 are electrically connected to each other via the second feeder line 24. The third internal terminal 26c is electrically connected to the fourth external connection terminal 100d via the fourth power supply bus bar 54.

The second feeder line 24 is provided with a sixth energization control unit 36. The midpoint between the third internal terminal 26c and the sixth energization control unit 36 on the second feeder line 24 is between the third energization control unit 33 and the fourth energization control unit 34 on the first feeder line 23. It is connected to the midpoint. As a result, the sixth energization control unit 36 is connected in parallel with the third energization control unit 33.

Further, the midpoint between the fourth internal terminal 26d and the sixth energization control unit 36 in the second feeder line 24 is electrically connected to the fifth external connection terminal 100e via the third feeder line 25. A fifth energization control unit 35 is provided on the third feeder line 25. As a result, the fifth energization control unit 35 is connected in parallel with the first energization control unit 31.

As described above, the first energization control unit 31, the second energization control unit 32, the fourth energization control unit 34, and the third energization control unit 33 are connected in order in an annular shape. The midpoint between the first energization control unit 31 and the second energization control unit 32 is connected to the second external connection terminal 100b. The midpoint between the second energization control unit 32 and the fourth energization control unit 34 is connected to the assembled battery 10. The midpoint between the fourth energization control unit 34 and the third energization control unit 33 is connected to the fourth external connection terminal 100d. The midpoint between the third energization control unit 33 and the first energization control unit 31 is connected to the first external connection terminal 100a.

Further, the midpoint between the first energization control unit 31 and the second energization control unit 32 is connected to the midpoint between the fourth energization control unit 34 and the third energization control unit 33 via the sixth energization control unit 36. .. The midpoint between the first energization control unit 31 and the second energization control unit 32 is connected to the fifth external connection terminal 100e via the fifth energization control unit 35.

With the above electrical connection configuration, the electrical connection between the first external connection terminal 100a and the second external connection terminal 100b is controlled by controlling the opening and closing of the first energization control unit 31. In other words, the electrical connection between the lead-acid battery 110 and the rotary electric machine 130 is controlled by controlling the opening and closing of the first energization control unit 31.

By controlling the opening and closing of the second energization control unit 32, the electrical connection between the second external connection terminal 100b and the assembled battery 10 is controlled. In other words, the electrical connection between the rotary electric machine 130 and the assembled battery 10 is controlled by controlling the opening and closing of the second energization control unit 32.

By controlling the opening and closing of the fourth energization control unit 34, the electrical connection between the second internal terminal 26b and the third internal terminal 26c is controlled. In other words, the electrical connection between the assembled battery 10 and the protective load 152 is controlled by controlling the opening and closing of the fourth energization control unit 34.

By controlling the opening and closing of the third energization control unit 33, the electrical connection between the first internal terminal 26a and the third internal terminal 26c is controlled. In other words, the electrical connection between the lead-acid battery 110 and the protective load 152 is controlled by controlling the opening and closing of the third energization control unit 33.

Further, by controlling the opening and closing of the sixth energization control unit 36, the electrical connection between the fourth internal terminal 26d and the third internal terminal 26c is controlled. In other words, the electrical connection between the rotary electric machine 130 and the protective load 152 is controlled by controlling the opening and closing of the sixth energization control unit 36.

By controlling the opening and closing of the fifth energization control unit 35, the electrical connection between the fourth internal terminal 26d and the fifth external connection terminal 100e is controlled. In other words, the electrical connection between the rotary electric machine 130 and the lead storage battery 110 is controlled by controlling the opening and closing of the fifth energization control unit 35.

Furthermore, by simultaneously opening and closing the fifth energization control unit 35 and the sixth energization control unit 36, the electrical connection between the third internal terminal 26c and the fifth external connection terminal 100e is controlled. In other words, the electrical connection between the protective load 152 and the lead-acid battery 110 is controlled by simultaneously opening and closing the fifth energization control unit 35 and the sixth energization control unit 36.

As shown above, the connection targets of the first energization control unit 31 to the sixth energization control unit 36 are different. Therefore, the energization amounts of the first energization control unit 31 to the sixth energization control unit 36 are different. The calorific value of each of the first energization control unit 31 to the sixth energization control unit 36 is different. The first feeder line 23 to the third feeder line 25 and the first feeder bus bar 51 to the fourth feeder bus bar 54 correspond to the current path.

The connection between each of the above-mentioned power supply bus bars and each switch is performed by laser welding. The connection between each power supply bus bar and the external connection terminal is made by bolting. The connection between each power supply bus bar and the circuit board 20 is made by brazing.

<The amount of heat generated by the switch>
Next, the calorific value of the energization control unit 30 will be described. As described above, each of the first energization control unit 31 and the second energization control unit 32 has two switching units in which two MOSFETs as semiconductor switches are connected in series. As shown in FIGS. 1 to 3, in the following, one of the two opening / closing parts of the first energization control unit 31 is referred to as a first opening / closing part 31a, and the remaining one is referred to as a second opening / closing part 31b. .. Similarly, one of the two opening / closing units of the second energization control unit 32 is referred to as a third opening / closing unit 32a, and the remaining one is referred to as a fourth opening / closing unit 32b.

As shown in FIG. 1, the first opening / closing unit 31a and the second opening / closing unit 31b of the first energization control unit 31 are connected in parallel between the first external connection terminal 100a and the second external connection terminal 100b. Therefore, the same amount of current flows through the first opening / closing portion 31a and the second opening / closing portion 31b. Therefore, the calorific value of the first opening / closing portion 31a and the second opening / closing portion 31b is about the same. In the following, the amount of heat generated in each of these opening / closing portions is referred to as the first calorific value.

On the other hand, the third opening / closing unit 32a and the fourth opening / closing unit 32b of the second energization control unit 32 are connected in parallel between the assembled battery 10 and the second external connection terminal 100b. Therefore, the same amount of current flows through the third opening / closing portion 32a and the fourth opening / closing portion 32b. Therefore, the calorific value of the third opening / closing portion 32a and the fourth opening / closing portion 32b is about the same. In the following, the amount of heat generated in each of these opening / closing portions is referred to as a second calorific value.

The lead storage battery 110 is connected to the first external connection terminal 100a. The rotary electric machine 130 is connected to the second external connection terminal 100b. Therefore, one end of each of the first opening / closing portion 31a and the second opening / closing portion 31b is connected to the lead storage battery 110. The other ends of the first opening / closing portion 31a and the second opening / closing portion 31b are connected to the rotary electric machine 130. On the other hand, one end of each of the third opening / closing portion 32a and the fourth opening / closing portion 32b is connected to the assembled battery 10. The other ends of the third opening / closing portion 32a and the fourth opening / closing portion 32b are connected to the rotary electric machine 130.

Therefore, by closing the first opening / closing portion 31a and the second opening / closing portion 31b, the lead-acid battery 110 and the rotary electric machine 130 are electrically connected. By closing the third opening / closing portion 32a and the fourth opening / closing portion 32b, the assembled battery 10 and the rotary electric machine 130 are electrically connected.

The lead-acid battery 110 and the assembled battery 10 have different storage capacities and energy densities. In addition, the amount of charge and temperature will change depending on its use. Therefore, which of the lead-acid battery 110 and the assembled battery 10 supplies power to the rotary electric machine 130 in the power running state varies depending on the operating state of the vehicle and the like. Whether or not to supply the generated power generated by the rotary electric machine 130 in the power generation state to the lead storage battery 110 and the assembled battery 10 appropriately changes depending on the charge amount and temperature of each battery.

Therefore, the frequency and duration of the closed state are different between the first opening / closing section 31a and the second opening / closing section 31b and the third opening / closing section 32a and the fourth opening / closing section 32b. Therefore, the amount of energization differs between the first opening / closing portion 31a and the second opening / closing portion 31b and the third opening / closing portion 32a and the fourth opening / closing portion 32b. Therefore, the amount of heat generated differs between the first opening / closing section 31a and the second opening / closing section 31b and the third opening / closing section 32a and the fourth opening / closing section 32b. As a result, the first calorific value and the second calorific value are different.

For example, when the first energization control unit 31 has a longer closing time than the second energization control unit 32 and the energization time is longer, the first energization control unit 31 generates heat as compared with the second energization control unit 32. .. In this case, the first calorific value is higher than the second calorific value.

Therefore, for example, when the first opening / closing unit and the second opening / closing unit of the first energization control unit are arranged together in one place, the calorific value at that place is twice the first calorific value. Similarly, when the third opening / closing part and the fourth opening / closing part of the second energization control unit are arranged together in one place, the calorific value at that place is twice the second calorific value. As a result, the first opening / closing portion and the second opening / closing portion tend to have a higher temperature than the third opening / closing portion and the fourth opening / closing portion, and their lifespan tends to be shortened. That is, the semiconductor switch of the first opening / closing part and the second opening / closing part tends to have a higher temperature than the semiconductor switch of the third opening / closing part and the fourth opening / closing part, and its life tends to be shortened.

<Arrangement of switches and their effects>
Therefore, in the battery pack 100, the opening / closing portions of the plurality of energization control units are distributed and arranged in the plurality of regions so that the opening / closing portions of the different energization control units are located in one region. That is, as shown in FIG. 3, the first energization control unit 31 and the second energization are formed in the first mounting area 93a and the second mounting area 93b of the bottom wall 93 of the housing 91 separated by the first boundary line BL1 indicated by the alternate long and short dash line. The opening / closing portions of the control unit 32 are distributed and arranged. The housing 91 corresponds to the mounting portion.

More specifically, the first opening / closing portion 31a and the third opening / closing portion 32a are distributed and arranged on the first upper surface 96a of the first heat radiating portion 96 included in the first mounting area 93a. The second opening / closing portion 31b and the fourth opening / closing portion 32b are distributed and arranged on the second upper surface 97a of the second heat radiating portion 97 included in the second mounting area 93b.

As a result, the total calorific value of the opening / closing portion provided on the first upper surface 96a is the sum of the first calorific value and the second calorific value. Similarly, the total calorific value of the opening / closing portion provided on the second upper surface 97a is the sum of the first calorific value and the second calorific value. The total amount of heat generated in the opening / closing portions provided on the first upper surface 96a and the second upper surface 97a is made uniform.

As a result, unlike the configuration in which, for example, the first opening / closing portion and the second opening / closing portion of the first energization control unit are provided in the same mounting area, it is possible to suppress an increase in the amount of heat generated in a specific mounting area. As a result, it is possible to prevent variations in the life of the opening / closing portions of the first energization control unit 31 and the second energization control unit 32. That is, it is possible to prevent variations in the life of the semiconductor switches of the first energization control unit 31 and the second energization control unit 32. Further, the BMU 22 suppresses the limitation on the driving of the semiconductor switches of the first energization control unit 31 and the second energization control unit 32.

Further, as shown in FIG. 2, the first heat radiating unit 96 and the second heat radiating unit 97 are laterally separated from each other. The first upper surface 96a and the second upper surface 97a, which are the mounting surfaces of the opening / closing portion, are not continuously connected in a plane along the horizontal and vertical directions. The portion of the housing 91 that connects the first heat radiating portion 96 and the second heat radiating portion 97 has a shorter length (thickness) in the height direction than each of the first heat radiating portion 96 and the second heat radiating portion 97. Therefore, it is difficult for heat flow to occur between the first heat radiating unit 96 and the second heat radiating unit 97. The heat dissipation performances of the first heat radiation unit 96 and the second heat radiation unit 97 are the same.

The heat of the first heat radiating unit 96 and the second heat radiating unit 97 is dissipated to the vehicle body via the flange 95 and the bolt. The heat radiation path of the first heat radiation unit 96 and the second heat radiation unit 97 to the vehicle body may be formed between the first heat radiation unit 96 and the second heat radiation unit 97.

As shown in FIG. 3, in the lateral direction, the first opening / closing portion 31a, the third opening / closing portion 32a, the second opening / closing portion 31b, and the fourth opening / closing portion 32b are linearly arranged in this order. The opening and closing parts of different energization control units are arranged alternately. That is, the opening / closing portions having different calorific values are arranged alternately. Opening and closing parts with the same calorific value are not lined up in the horizontal direction. As a result, it is possible to prevent the heat distribution in the first mounting region 93a and the second mounting region 93b from being biased as compared with the configuration in which the opening / closing portions having the same calorific value are arranged. It is possible to suppress a difference in the amount of heat of the plurality of opening / closing portions provided in the housing 91.

In this embodiment, in order to simplify the explanation, the opening / closing portions of the first energization control unit 31 and the second energization control unit 32 are exclusively distributed and arranged. These opening / closing portions have a plurality of semiconductor switches as described above. Therefore, in other words, the battery pack 100 of the present embodiment has a configuration in which the four semiconductor switches of the first energization control unit 31 and the four semiconductor switches of the second energization control unit 32 are distributed and arranged. There is.

As shown in FIGS. 1 and 3, in the following, the semiconductor switch included in the first opening / closing portion 31a is referred to as a first switch 61 and a second switch 62. The semiconductor switch included in the second opening / closing unit 31b is referred to as a third switch 63 and a fourth switch 64. The semiconductor switch included in the third opening / closing portion 32a is referred to as a fifth switch 65 and a sixth switch 66. The semiconductor switch included in the fourth opening / closing portion 32b is referred to as a seventh switch 67 and an eighth switch 68.

In this case, as shown in FIG. 3, the first switch 61, the second switch 62, the fifth switch 65, and the sixth switch 66 are provided on the first upper surface 96a of the first heat dissipation portion 96 of the first mounting area 93a. .. A third switch 63, a fourth switch 64, a seventh switch 67, and an eighth switch 68 are provided on the second upper surface 97a of the second heat radiating portion 97 of the second mounting area 93b. As shown above, a plurality of switches having different energization paths are equally distributed to the plurality of mounting areas so that the amount of heat in each mounting area is made uniform.

(First modification)
In this embodiment, an example in which the first upper surface 96a of the first heat radiating portion 96 and the second upper surface 97a of the second radiating portion 97, which are the mounting surfaces of the opening / closing portion, are not continuously connected in a plane along the horizontal and vertical directions. showed that. However, for example, as shown in FIGS. 4 and 5, a configuration in which the first upper surface 96a and the second upper surface 97a are continuously connected in a plane along the horizontal direction and the vertical direction can be adopted.

In the modified example shown in FIG. 4, a notch 98 is formed between the first heat radiating portion 96 and the second radiating portion 97 on the bottom wall 93. The notch 98 is formed in the bottom wall 93 so that the back surface of the mounting surface is locally recessed. As a result, the portion of the bottom wall 93 between the first heat radiating portion 96 and the second heat radiating portion 97 has a shorter length (thickness) in the height direction than each of the first heat radiating portion 96 and the second heat radiating portion 97. It has become.

On the other hand, in the modified example shown in FIG. 5, the portion of the bottom wall 93 between the first heat radiating portion 96 and the second heat radiating portion 97 is in the height direction with each of the first heat radiating portion 96 and the second heat radiating portion 97. The length (thickness) is about the same. Therefore, heat flow is likely to occur between the first heat radiating unit 96 and the second heat radiating unit 97.

Further, in the modified example shown in FIG. 5, opening / closing portions having different calorific values are alternately arranged in the same manner as in the present embodiment. As described above, in this modification, heat flow is likely to occur between the first heat radiating unit 96 and the second heat radiating unit 97. Therefore, by alternately arranging the opening / closing portions having different heat generation amounts, it is possible to prevent the heat distribution between the first mounting region 93a and the second mounting region 93b from being biased. As a result, it is possible to prevent a difference in the amount of heat of the plurality of opening / closing portions provided on the bottom wall 93.

In the modified example shown in FIG. 5, in order to maintain thermal independence between the first mounting area 93a and the second mounting area 93b, it is necessary to separate the opening / closing portions mounted on the first mounting area 93a and the second mounting area 93b to some extent. That is, the shortest separation distance between the opening / closing portion of the first mounting region 93a and the opening / closing portion of the second mounting region 93b is made longer than the shortest separation distance between the opening / closing portions in each mounting region. Alternatively, the shortest separation distance between the opening / closing portion of the first mounting region 93a and the opening / closing portion of the second mounting region 93b is made longer than the shortest separation distance between the semiconductor switches in each mounting region.

(Second modification)
In this embodiment, an example is shown in which opening / closing portions having different calorific values are arranged alternately. However, for example, as shown in FIG. 6, it is also possible to adopt a configuration in which opening / closing portions having the same calorific value are lined up. In this modification, in the lateral direction, the first opening / closing portion 31a, the third opening / closing portion 32a, the fourth opening / closing portion 32b, and the second opening / closing portion 31b are linearly arranged in this order.

In this modification, the first opening / closing portion 31a and the second opening / closing portion 31b of the first energization control unit 31 are located at the ends of the arrangement of the four opening / closing portions. On the other hand, the third opening / closing section 32a and the fourth opening / closing section 32b of the second energization control section 32 are located inside the arrangement of the four opening / closing sections. Therefore, the first opening / closing portion 31a and the second opening / closing portion 31b have higher heat dissipation than the third opening / closing portion 32a and the fourth opening / closing portion 32b. Therefore, for example, when the first energization control unit 31 has a larger time average energization amount than the second energization control unit 32, it is possible to make the heat dissipation of each opening / closing unit uniform by adopting such a configuration. can. The time average energization amount indicates, for example, the average value of the current flowing in the time from the start to the end of the BMU 22 controlling the drive of the energization control unit.

(Third modification example)
As shown in FIG. 7, it is also possible to adopt a configuration in which fins 99 for positively radiating the heat of each of the first heat radiating unit 96 and the second heat radiating unit 97 are formed. The fin 99 is formed between the first heat radiating portion 96 and the second radiating portion 97 in the housing 91. The fin 99 is formed on the bottom wall 93 in such a manner that the mounting surface locally projects. The fins 99 dissipate the heat of the opening / closing portions provided in the first heat radiating portion 96 and the second heat radiating portion 97, respectively.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIG. The battery packs according to each of the following embodiments have much in common with those according to the above-described embodiments. Therefore, in the following, the explanation of the common part will be omitted, and the different parts will be explained with emphasis. Further, in the following, the same reference numerals are given to the same elements as those shown in the above-described embodiment.

In the first embodiment, an example is shown in which the opening / closing portions of the first energization control unit 31 and the second energization control unit 32 are distributed and arranged in different regions of the housing 91. On the other hand, in the present embodiment, the opening / closing portions (semiconductor switches) of the third energization control unit 33 and the fourth energization control unit 34 are distributed and arranged in different regions of the wiring board 21. The wiring board 21 corresponds to the mounting portion.

As shown in FIGS. 1 and 8, in the following, one of the two semiconductor switches included in the third energization control unit 33 is referred to as a ninth switch 69, and the remaining one is referred to as a tenth switch 70. Similarly, the four semiconductor switches included in the fourth energization control unit 34 are referred to as the eleventh switch 71, the twelfth switch 72, the thirteenth switch 73, and the fourteenth switch 74.

As shown in FIG. 1, the ninth switch 69 and the tenth switch 70 of the third energization control unit 33 are connected in series between the first external connection terminal 100a and the fourth external connection terminal 100d. Therefore, the same amount of current flows through the 9th switch 69 and the 10th switch 70. Therefore, the calorific value of the 9th switch 69 and the 10th switch 70 is about the same. In the following, the amount of heat generated by each of these switches is referred to as the third calorific value.

On the other hand, the 11th switch 71 to the 14th switch 74 of the 4th energization control unit 34 are connected in series between the assembled battery 10 and the 4th external connection terminal 100d. Therefore, the same amount of current flows through the 11th switch 71 to the 14th switch 74. Therefore, the calorific value of the 11th switch 71 to the 14th switch 74 is about the same. In the following, the amount of heat generated by each of these switches is referred to as the fourth calorific value.

In the battery pack 100 of the present embodiment, the 9th switch 69 to the 14th switch 74 are distributed and arranged in different regions. That is, as shown in FIG. 8, the third energization control unit 33 and the fourth energization control unit 34 are formed in the third mounting area 21a and the fourth mounting area 21b of the wiring board 21 separated by the second boundary line BL2 indicated by the alternate long and short dash line. The switches are distributed and arranged.

More specifically, the ninth switch 69, the eleventh switch 71, and the twelfth switch 72 are distributed and arranged on the first mounting surface 21c of the wiring board 21 included in the third mounting region 21a. The 10th switch 70, the 13th switch 73, and the 14th switch 74 are distributed and arranged on the second mounting surface 21d of the wiring board 21 included in the fourth mounting area 21b.

As a result, the total calorific value of the switch provided on the first mounting surface 21c is the sum of the third calorific value and the double fourth calorific value. Similarly, the total calorific value of the switch provided on the second mounting surface 21d is the sum of the third calorific value and the double fourth calorific value. The total amount of heat generated by the switches provided on the first mounting surface 21c and the second mounting surface 21d is made uniform.

As a result, unlike the configuration in which the 11th switch to the 14th switch of the 4th energization control unit are provided in the same mounting area, it is possible to suppress an increase in the amount of heat generated in a specific mounting area. As a result, it is possible to prevent variations in the life of the switches of the third energization control unit 33 and the fourth energization control unit 34.

The battery pack 100 according to the present embodiment contains the same components as the battery pack 100 described in the first embodiment. Therefore, it goes without saying that they have the same effect.

Further, as shown in FIG. 8, the first mounting surface 21c and the second mounting surface 21d are not continuously connected in a plane along the horizontal direction and the vertical direction. A notch 21e is formed at the boundary between the first mounting surface 21c and the second mounting surface 21d on the wiring board 21. The notch 21e is formed in the wiring board 21 so that the mounting surface is locally recessed. As a result, the portion of the wiring board 21 where the notch 21e is formed has a shorter length (thickness) in the height direction than the portion of the wiring board 21 having the first mounting surface 21c and the second mounting surface 21d. Therefore, it is difficult for heat flow to occur between the portion having the first mounting surface 21c and the portion having the second mounting surface 21d. The heat dissipation performance of the portion having the first mounting surface 21c and the portion having the second mounting surface 21d is the same.

The heat of the portion of the wiring board 21 having the first mounting surface 21c and the portion having the second mounting surface 21d is dissipated to the vehicle body via the bolt and the housing 91. A hole for passing a bolt that functions as a heat dissipation path can be formed at the boundary between the first mounting surface 21c and the second mounting surface 21d on the wiring board 21. As a result, the heat generated by the switch provided on the first mounting surface 21c and the heat generated by the switch provided on the second mounting surface 21d are dissipated to the vehicle body via the common bolt and the housing 91, respectively. Will be done.

(Fourth modification)
In the present embodiment, an example is shown in which the first mounting surface 21c and the second mounting surface 21d, which are the mounting surfaces of the opening / closing portion, are not continuously connected in a plane along the horizontal direction and the vertical direction. However, for example, as shown in FIG. 9, a configuration in which the first mounting surface 21c and the second mounting surface 21d are continuously connected in a plane along the horizontal direction and the vertical direction can be adopted. In the modified example shown in FIG. 9, the notch 21e is not formed on the wiring board 21.

Further, in the modified example shown in FIG. 9, the switches of different energization control units are arranged alternately. That is, in the lateral direction, the ninth switch 69, the eleventh switch 71 and the twelfth switch 72, the tenth switch 70, and the thirteenth switch 73 and the fourteenth switch 74 are arranged in a straight line in order. In this modification, the notch 21e is not formed on the wiring board 21, and heat flow is likely to occur between the portion having the first mounting surface 21c and the portion having the second mounting surface 21d. Therefore, it is possible to prevent bias in the heat distribution between the portion having the first mounting surface 21c and the portion having the second mounting surface 21d. As a result, it is possible to suppress a difference in the amount of heat of the plurality of switches provided on the wiring board 21.

Although not shown, the wiring board 21 can also adopt a configuration in which switches having the same energization path are lined up. For example, it is possible to adopt a configuration in which the 11th switch 71 and the 12th switch 72, the 9th switch 69, the 10th switch 70, and the 13th switch 73 and the 14th switch 74 are arranged in a straight line in the horizontal direction.

In this modification, the 11th switch 71 to the 14th switch 74 of the 4th energization control unit 34 are located at the end of the switch arrangement. On the other hand, the 9th switch 69 and the 10th switch 70 of the 3rd energization control unit 33 are located inside the line of switches. Therefore, the fourth energization control unit 34 has higher heat dissipation than the third energization control unit 33. Therefore, for example, when the fourth energization control unit 34 has a larger time average energization amount than the third energization control unit 33, the heat dissipation of each switch can be made uniform by adopting such a configuration. ..

(Fifth variant)
In this embodiment, the arrangement of the fifth energization control unit 35 and the sixth energization control unit 36 on the wiring board 21 is not particularly mentioned. Considering the uniformity of the total heat amount of the switch in the above-mentioned plurality of mounting areas, for example, the fifth energization control unit 35 is provided on the first mounting surface 21c, and the sixth energization control unit 36 is provided on the second mounting surface 21d. It is also possible to adopt the configured configuration.

The fifth energization control unit 35 and the sixth energization control unit 36 are closed when the vehicle is parked or stopped or when the input of the control signal from the BMU 22 is interrupted. Therefore, the fifth energization control unit 35 and the sixth energization control unit 36 have a lower energization frequency than the other energization control units. Therefore, the fifth energization control unit 35 and the sixth energization control unit 36 are less likely to generate heat than the other energization control units.

Therefore, the fifth energization control unit 35 and the sixth energization control unit 36 may be provided inside the switch arrangement. Further, the fifth energization control unit 35 and the sixth energization control unit 36 may be provided at positions farther from the heat dissipation path than the switch provided on the wiring board 21. As a result, it is possible to prevent the switch having a higher frequency of energization from having lower heat dissipation than the fifth energization control unit 35 and the sixth energization control unit 36.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure can be variously modified and implemented without being limited to the above-described embodiments and within a range that does not deviate from the gist of the present disclosure. Is.

(Sixth modification)
In each embodiment, an example is shown in which the first energization control unit 31 and the second energization control unit 32 are mounted on the housing 91, and the third energization control unit 33 to the sixth energization control unit 36 are mounted on the wiring board 21. .. However, it is also possible to adopt a configuration in which the first energization control unit 31 to the sixth energization control unit 36 are mounted on the housing 91. Alternatively, it is possible to adopt a configuration in which the first energization control unit 31 to the sixth energization control unit 36 are mounted on the wiring board 21. Even in such a configuration, the switches of each energization control unit are distributed to a plurality of mounting areas.

(7th modification)
In the first embodiment, the first mounting area 93a and the second mounting area 93b are shown as the mounting areas of the housing 91. In the second embodiment, the third mounting area 21a and the fourth mounting area 21b are shown as the mounting areas of the wiring board 21. However, the number of mounting areas of the housing 91 and the wiring board 21 is not limited to the above example, and three or more can be adopted.

The number of mounting areas of the housing 91 is not particularly limited as long as the total amount of heat generated by the switches provided in the plurality of mounting areas of the housing 91 is made uniform. The number of mounting areas of the wiring board 21 is not particularly limited as long as the total amount of heat generated by the switches provided in the plurality of mounting areas of the wiring board 21 is made uniform. It should be noted that the uniforming of the total amount of heat generated by the switches provided in the plurality of mounting areas may be realized on at least one of the housing 91 and the wiring board 21.

(8th modification)
For example, as shown in FIG. 10, it is possible to adopt a configuration in which the first energization control unit 31 to the fourth energization control unit 34 are mounted on the bottom wall 93 of the housing 91.

In each embodiment, an example is shown in which a feeding bus bar is connected to the first energization control unit 31 and the second energization control unit 32, and a feeder line is connected to the third energization control unit 33 and the fourth energization control unit 34. This is because the first energization control unit 31 and the second energization control unit 32 have a larger time average energization amount than the third energization control unit 33 and the fourth energization control unit 34. Therefore, as shown in FIG. 10, a first energization control unit 31 and a third energization control unit 33 are provided in the first mounting area 93a, and a second energization control unit 32 and a fourth energization control unit 34 are provided in the second mounting area 93b. .. According to this, it is possible to suppress a difference in the amount of heat generated by the energization control unit between the first mounting area 93a and the second mounting area 93b. That is, the total amount of heat in the first mounting area 93a and the second mounting area 93b is made uniform.

In consideration of heat dissipation, as shown in FIG. 10, in the arrangement of the plurality of energization control units, the first energization control unit 31 and the first energization control unit 31 having a larger energization amount than the third energization control unit 33 and the fourth energization control unit 34. 2 It is preferable that each of the energization control units 32 is located at the end. In FIG. 10, the first energization control unit 31, the third energization control unit 33, the second energization control unit 32, and the fourth energization control unit 34 are arranged in this order.

(9th modification)
In each embodiment, an example is shown in which the energization control unit 30 has the first energization control unit 31 to the sixth energization control unit 36. However, as shown in FIG. 11, the energization control unit 30 adopts a configuration in which the fifth energization control unit 35 and the sixth energization control unit 36 are not provided, but the first energization control unit 31 to the fourth energization control unit 34 are provided. You can also do it.

(10th modification)
Further, as shown in FIG. 12, the energization control unit 30 does not have the third energization control unit 33 and the fourth energization control unit 34, and the first energization control unit 31, the second energization control unit 32, and the fifth energization control unit do not have. It is also possible to adopt a configuration having a unit 35 and a sixth energization control unit 36.

(11th modification)
In each embodiment, the first energization control unit 31 and the second energization control unit 32 have two opening / closing units connected in parallel. The third energization control unit 33 has one opening / closing unit. The fourth energization control unit 34 has shown an example of having two opening / closing units connected in series. However, the number of opening / closing portions of each energization control unit is not limited to the above example. Each energization control unit may have at least one opening / closing unit. That is, each energization control unit may have at least two semiconductor switches.

Further, an example is shown in which each of the first energization control unit 31 to the fourth energization control unit 34 has a semiconductor switch. However, each of the first energization control unit 31 to the fourth energization control unit 34 may have a mechanical relay. The element for controlling the energization of each energization control unit is not particularly limited.

(12th variant)
In each embodiment, an example is shown in which an energization control unit is provided on the bottom wall 93 of the housing 91. However, the mounting location of the energization control unit in the housing 91 is not limited to the bottom wall 93. For example, the energization control unit may be provided on the side wall 94.

(Other variants)
In each embodiment, an example is shown in which the assembled battery 10 has five battery cells. However, the assembled battery 10 may have a plurality of battery cells, and is not limited to the above example. Further, as the number of battery stacks, one or three or more may be adopted instead of two. Furthermore, the battery stack may be formed by arranging the battery cells in the horizontal direction.

In each embodiment, an example is shown in which the vehicle equipped with the power supply system 200 has an idle stop function. However, the vehicle equipped with the power supply system 200 is not limited to the above example. For example, a hybrid vehicle or an electric vehicle can be adopted. In this case, the starter motor 120 and the rotary electric machine 130 shown in the present embodiment replace the motor generator.

10 ... assembled battery, 20 ... circuit board, 21 ... wiring board, 21a ... third mounting area, 21b ... fourth mounting area, 22 ... BMU, 23 ... first feeding line, 24 ... second feeding line, 25 ... first 3 power supply line, 30 ... energization control unit, 31 ... first energization control unit, 32 ... second energization control unit, 33 ... third energization control unit, 34 ... fourth energization control unit, 35 ... fifth energization control unit, 36 ... 6th power supply control unit, 50 ... power supply bus bar, 51 ... first power supply bus bar, 52 ... second power supply bus bar, 53 ... third power supply bus bar, 54 ... fourth power supply bus bar, 61 ... first switch, 62 ... 2 switches, 63 ... 3rd switch, 64 ... 4th switch, 65 ... 5th switch, 66 ... 6th switch, 67 ... 7th switch, 68 ... 8th switch, 69 ... 9th switch, 70 ... 10th switch , 71 ... 11th switch, 72 ... 12th switch, 73 ... 13th switch, 74 ... 14th switch, 91 ... housing, 93 ... bottom wall, 93a ... first mounting area, 93b ... second mounting area, 94 ... Side wall, 100 ... Battery pack, 110 ... Lead storage battery, 130 ... Rotating electric wire, 200 ... Power supply system

Claims (7)

Multiple current paths (23-25, 50-54) and
A plurality of energization control units (30 to 36) provided in each of the plurality of current paths, and
A battery (10) connected to at least one of the plurality of current paths, and a battery (10).
It has a mounting unit (21, 91) for mounting the plurality of energization control units.
Each of the plurality of energization control units has a plurality of switches (61 to 74) connected in at least one of parallel connection and series connection.
The mounting portion has a plurality of mounting areas (21a, 21b, 93a, 93b) in which the switch is provided.
The switches possessed by each of the plurality of energization control units are distributed and arranged in each of the plurality of mounting areas so that the switches possessed by the different energization control units are arranged in one mounting area .
Each mounting area is a part where the switch is provided, and includes a heat radiating portion provided at a position separated from each other.
A battery pack in which the switches of different energization control units are alternately arranged in the mounting unit . Multiple current paths (23-25, 50-54) and
A plurality of energization control units (30 to 36) provided in each of the plurality of current paths, and
A battery (10) connected to at least one of the plurality of current paths, and a battery (10).
It has a mounting unit (21, 91) for mounting the plurality of energization control units.
Each of the plurality of energization control units has a plurality of switches (61 to 74) connected in at least one of parallel connection and series connection.
The mounting portion has a plurality of mounting areas (21a, 21b, 93a, 93b) in which the switch is provided.
The switches possessed by each of the plurality of energization control units are distributed and arranged in each of the plurality of mounting areas so that the switches possessed by the different energization control units are arranged in one mounting area .
Each mounting area is a part where the switch is provided, and includes a heat radiating portion provided at a position separated from each other.
The switches of the different energization control units are lined up in the mounting unit.
Assuming that one of the different energization control units is the first energization control unit and the other is the second energization control unit,
A battery pack in which the switch of the first energization control unit is located at the end of the array of switches in the mounting unit rather than the switch of the second energization control unit . A housing (91) for storing the battery and
Wiring members (50 to 54) provided in the housing and
It has a wiring board (21) having a wiring pattern (23 to 25), and has.
The mounting portion is at least one of the housing and the wiring board.
The plurality of current paths have at least one of the wiring pattern and the wiring member.
The battery pack according to claim 1 or 2 , wherein the plurality of energization control units are provided on at least one of the wiring member and the wiring pattern. The mounting portion is the housing.
The battery pack according to claim 3 , wherein the plurality of current paths have the wiring member. The wiring member includes a first wiring member (51, 52) that connects an external power supply (110) and a load (130), and a second wiring member (52, 53) that connects the battery and the load. Have,
A claim that includes, as the plurality of the energization control units, a first energization control unit (31) provided in the first wiring member and a second energization control unit (32) provided in the second wiring member. The battery pack according to 4 . The battery pack according to any one of claims 3 to 5 , wherein the housing has higher heat transfer performance than the wiring board. It has an open / close control unit (22) that controls opening / closing of each of the plurality of switches of the plurality of energization control units.
The battery pack according to any one of claims 1 to 6 , wherein the open / close control unit controls all the switches included in one energization control unit to be in an open state or a closed state at the same time.

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