JP7139832B2 - battery pack - Google Patents

Description

The disclosure provided herein relates to battery packs.

2. Description of the Related Art As disclosed in Patent Literature 1, a battery device is known that includes an assembled battery, a circuit board, and a terminal block unit that connects the assembled battery and the circuit board to harnesses. Each of these assembled battery, circuit board, and terminal block unit is housed in a base case.

A power element is provided in the base case. The power element is electrically connected to the terminal block unit.

JP 2018-63922 A

As described above, in the battery device disclosed in Patent Document 1, the power element is connected to the terminal block unit that is connected to the harness. Therefore, when electromagnetic noise is input to the harness, the electromagnetic noise may be input to the power element (switch).

Therefore, an object of the disclosure described in this specification is to provide a battery pack in which input of electromagnetic noise to a switch is suppressed.

One disclosure is a battery (10);
a circuit board (20);
a housing (91) for housing the battery and the circuit board;
switches (31, 32) provided on the housing;
input/output terminals (100a, 100b) connected to external devices (110, 120, 130, 151);
Conductive portions (51, 52) for electrically and mechanically connecting the input/output terminal and the circuit board, and the input/output terminal and the switch, respectively;
a filter (70) for removing electromagnetic noise input to the conductive part;
the electrical resistance between the input/output terminal and the switch in the conductive portion is lower than the electrical resistance between the input/output terminal and the circuit board;
The filter is mechanically and electrically connected between the input/output terminal on the conductive portion and the switch.

According to this, the electromagnetic noise inputted to the conductive parts (51, 52) is removed by the filter (70) before being inputted to the switches (31, 32). Therefore, the input of electromagnetic noise to the switches (31, 32) is suppressed.

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 in any way.

1 is a block diagram showing a power supply system; FIG. FIG. 3 is a schematic diagram for explaining a connection form of a battery pack; It is a schematic diagram which shows the connection form of a filter. 4 is a chart for explaining filters; It is a chart which shows the modification of a filter. It is a chart which shows the modification of a filter. It is a chart which shows the modification of a filter. It is a chart which shows the modification of a filter.

Embodiments will be described below with reference to the drawings.

(First embodiment)
A battery pack 100 and a power supply system 200 including the battery pack 100 according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG.

<Summary of power supply system>
Power supply system 200 is mounted on a vehicle. A power supply system 200 includes a plurality of in-vehicle devices mounted on a vehicle and a battery pack 100 . A storage battery 110 is 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 with the storage battery 110 and the assembled battery 10 .

There is an engine 140 as another in-vehicle device. A vehicle equipped with power supply system 200 has an idle stop function that stops engine 140 when a predetermined stop condition is met, and restarts engine 140 when a predetermined start condition is met.

As shown in FIG. 1 , power supply system 200 includes starter motor 120 , rotating electric machine 130 , electric load 150 , host ECU 160 , and MGECU 170 in addition to storage battery 110 and engine 140 described above. Storage battery 110 , starter motor 120 , and electric load 150 are each electrically connected to battery pack 100 via first wire harness 210 . Rotating electric machine 130 is electrically connected to battery pack 100 via second wire harness 220 .

Host ECU 160 and MGECU 170 are electrically connected to storage battery 110 and assembled battery 10 of battery pack 100 via wiring (not shown), respectively. Similarly, various other ECUs mounted on the vehicle are electrically connected to the storage battery 110 and the assembled battery 10 via wiring (not shown).

As described above, the power supply system 200 constructs a dual power supply system using the storage battery 110 and the assembled battery 10 as power supplies.

<Constituent elements of the power supply system>
The storage battery 110 generates an electromotive force through a chemical reaction. The storage battery 110 has a larger power storage capacity than the assembled battery 10 . The storage battery 110 is specifically a lead storage battery.

Starter motor 120 starts engine 140 . Starter motor 120 is mechanically connected to engine 140 when engine 140 is started. The rotation of starter motor 120 causes the crankshaft of engine 140 to rotate. When the number of revolutions of the crankshaft exceeds a predetermined number of revolutions, the fuel injection valve injects atomized fuel into the combustion chamber. At this time, a spark is generated at the ignition plug. This causes the fuel to explode and the engine 140 to start rotating autonomously. The power of the engine 140 provides propulsion of the vehicle. When engine 140 begins to rotate autonomously, the mechanical connection between starter motor 120 and engine 140 is released.

The rotary electric machine 130 performs power running and power generation. A power converter (not shown) is connected to the rotating electric machine 130 . This power converter is electrically connected to the second wire harness 220 .

The power converter converts DC voltage supplied from at least one of storage battery 110 and assembled battery 10 of battery pack 100 into AC voltage. This AC voltage is supplied to rotating electric machine 130 . As a result, rotating electric machine 130 is powered.

Rotating electric machine 130 is coupled with engine 140 . Rotating electric machine 130 and engine 140 are capable of transmitting rotational energy to each other via a belt or the like. Rotational energy generated by power running of rotating electric machine 130 is transmitted to engine 140 . This promotes rotation of the engine 140 . As a result, vehicle running is assisted. As described above, a vehicle equipped with power supply system 200 has an idle stop function. Rotating electric machine 130 not only assists the running of the vehicle, but also functions to rotate the crankshaft when engine 140 is restarted.

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

Engine 140 generates propulsive force for the vehicle by burning fuel. As described above, when engine 140 is started, starter motor 120 rotates the crankshaft. However, when the engine 140 is restarted after being stopped by an idle stop, the crankshaft is rotated by the rotating electric machine 130 if the predetermined start condition is satisfied.

The electrical load 150 has a general load 151 and a protective load 152 . The general load 151 includes in-vehicle equipment such as a seat heater, a blower fan, an electric compressor, a room light, and a headlight, for which power supply may not be constant. The protected loads 152 include onboard equipment such as electric shift positions, electric power steering (EPS), brakes (ABS), door locks, navigation systems, and audio that require constant power supply. The illustrated protected load 152 has the property of switching from an on state to an off state when the supply voltage falls below the reset threshold. The protected load 152 includes in-vehicle equipment that is more relevant to vehicle running than the general load 151 .

It should be noted that the configuration in which the various on-vehicle devices described above are included in the general load 151 and the protective load 152 is merely an example. Various on-vehicle devices can be appropriately distributed to the general load 151 and the protection load 152 according to changes in the on-vehicle system. For example, a configuration in which the general load 151 includes EPS and ABS can be adopted.

The host ECU 160 and the MGECU 170 are one of various ECUs mounted on the vehicle. These various ECUs are electrically connected to each other via bus wiring 161 to construct an in-vehicle network. Coordinated control by various ECUs controls combustion of the engine 140 and power running and power generation of the rotary electric machine 130 . Host ECU 160 controls battery pack 100 . MGECU 170 controls rotating 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 depression of the accelerator pedal and the opening of the throttle valve, in addition to the onboard devices described above. have. Detection signals detected by these various sensors are input to various ECUs.

Note that ECU is an abbreviation for electronic control unit. The ECU has at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a storage medium for storing programs and data. The ECU is provided by a microcomputer having a computer readable storage medium. The storage medium is a non-transitional tangible storage medium that non-temporarily stores a computer-readable program. A storage medium may be provided by a semiconductor memory, a magnetic disk, or the like.

<Overview of battery pack>
As shown in FIG. 1 , battery pack 100 has assembled battery 10 , circuit board 20 , switch 30 , sensor section 40 , and power supply bus bar 50 . Also, the battery pack 100 has a busbar case and a pack case. A power supply busbar 50 is housed in a busbar case made of an insulating resin material. This constitutes a busbar module.

The pack case has a housing 91 shown in FIG. The housing 91 is manufactured by aluminum die casting. The pack case also has a cover (not shown). The cover is made of resin or metal.

The housing 91 has a bottom wall 92 and side walls 93 rising from the bottom wall 92 . Side walls 93 define openings. A cover is attached to the housing 91 . The opening defined by the side wall 93 is thereby covered with the cover. A storage space is configured by the housing 91 and the cover. The battery pack 10, the circuit board 20, the switch 30, the sensor section 40, and the busbar module are each housed in this housing space.

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

The circuit board 20 has a wiring board 21 and a BMU 22 . A part of the switch 30 and the BMU 22 are mounted on the wiring board 21 . The rest of the switch 30 and the assembled battery 10 are electrically connected to the wiring board 21 via the power supply bus bar 50 . An electric circuit of the battery pack 100 is thus configured. The sensor section 40 is electrically connected to this electric circuit via an insulated wire, a metal terminal, or the like.

The electric circuit of the battery pack 100 is electrically connected to external connection terminals indicated by double circles 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, and a fourth external connection terminal 100d.

First external connection terminal 100 a and fourth external connection terminal 100 d are electrically connected to storage battery 110 , starter motor 120 and electric load 150 via first wire harness 210 . Second external connection terminal 100 b is electrically connected to rotating electric machine 130 via second wire harness 220 . On the other hand, the third external connection terminal 100c is mechanically and electrically connected to the vehicle body. Storage battery 110, starter motor 120, general load 151 of electrical load 150, and rotary electric machine 130 correspond to external devices.

As shown in FIG. 1 , the first wire harness 210 is divided into one that connects the storage battery 110 , the starter motor 120 and the general load 151 and one that connects the protective load 152 . The end of the first wire harness 210 that connects the storage battery 110, the starter motor 120, and the general load 151 is connected to the first external connection terminal 100a. The end of the first wire harness 210 that connects the protective load 152 is connected to the fourth external connection terminal 100d.

Thus, first wire harness 210 is connected to first external connection terminal 100 a and fourth external connection terminal 100 d of battery pack 100 . Therefore, the first wire harness 210 has two terminals. These two terminals are metal terminals with holes. Also, the second wire harness 220 is connected to the second external connection terminal 100b. For this purpose, the second wire harness 220 has metal terminals with holes. These first wire harness 210 and second wire harness 220 are laid around in the vehicle.

As shown in FIGS. 2 to 4, the bottom wall 92 is formed with a terminal block 94 extending away from the bottom wall 92 . With the cover attached to the housing 91, the terminal block 94 is positioned outside the storage space.

The terminal block 94 is provided with a first external connection terminal 100a and a second external connection terminal 100b. Also, the fourth external connection terminal 100d is provided on a terminal block (not shown).

Each of the first external connection terminal 100a, the fourth external connection terminal 100d, and the second external connection terminal 100b has the connection bolt 95 and the resin base 96 shown in FIG. These external connection terminals also have a first nut 97 shown in column (c) of FIG. 4 and a second nut (not shown). A detailed description of the shape of the fourth external connection terminal 100d will be omitted below.

The first external connection terminal 100a and the second external connection terminal 100b share the resin base 96. As shown in FIG. The resin base 96 may be a part of the busbar case or may be a separate body. The first external connection terminal 100a and the second external connection terminal 100b correspond to input/output terminals.

Connection bolts 95 for each of the first external connection terminal 100a and the second external connection terminal 100b are insert-molded in the resin base 96 shared by the first external connection terminal 100a and the second external connection terminal 100b. The head side of the connection bolt 95 is buried in the resin base 96 . A shaft portion of the connection bolt 95 protrudes from the resin base 96 .

This resin base 96 is fixed to the terminal block 94 with a third bolt 90c. A filter substrate 71, which will be described later, is also fixed to the terminal block 94 together with the resin base 96 by the third bolts 90c. As a result, the connection bolts 95 and the filter board 71 are fixed to the terminal block 94 . A shaft portion of the connection bolt 95 extends away from the terminal block 94 .

A hole of the metal terminal of the wire harness and a first through hole 55a of the power supply bus bar 50 (to be described later) are passed through the shaft portion of the connection bolt 95 . These metal terminals and the power supply bus bar 50 are mechanically connected to the shaft portion of the connection bolt 95 by a first nut 97 and a second nut. At the same time, the metal terminal and the power supply bus bar 50 are electrically connected.

The third external connection terminal 100 c is a bolt hole formed in the housing 91 . The third external connection terminal 100c is connected to the vehicle body via a bolt or wire harness. As a result, the housing 91 is at the ground potential. The battery pack 100 is body grounded.

<Constituent Elements of Battery Pack>
Next, the components of battery pack 100 will be individually described. Accordingly, the three directions that are orthogonal to each other are hereinafter referred to as the x-direction, the y-direction, and the z-direction. The x-direction is along the left-right direction of the vehicle. The z-direction is along the vertical direction of the vehicle. If the vehicle is parked on a horizontal plane, the z-direction is along the vertical direction. The x and y directions are along the horizontal direction.

The assembled battery 10 has a plurality of series-connected battery cells and a battery case that houses these battery cells. These battery cells are in particular lithium-ion accumulators. Lithium-ion batteries generate an electromotive voltage through a chemical reaction. A current flows through the battery cell due to the generation of the electromotive voltage. As a result, the battery cells generate heat and generate gas. As a result, the battery cells expand. Note that the battery cells are not limited to the above examples. For example, secondary batteries such as nickel-hydrogen secondary batteries and organic radical batteries can be used as battery cells.

The battery cell has a rectangular parallelepiped shape. A battery cell has two main surfaces facing in the z-direction. These two main surfaces are larger in area than the other four surfaces. And the length (thickness) between the two main surfaces is thin. Thus, the battery cell has a flat shape with a thin thickness in the z direction.

The assembled battery 10 of this embodiment has five battery cells. Three of these five battery cells are stacked in the z-direction to form a first battery stack. The remaining two battery cells are stacked in the z-direction to form a second battery stack. These two cell stacks are aligned in the x-direction. The arrangement of these five battery cells is held by the battery case.

The battery case has a main body made of resin and connection terminals connected to the battery cells. As the connection terminal, there is a series connection terminal that connects five battery cells in series. The series connection terminals are brought into contact with the corresponding electrode terminals of the two battery cells, and the two are welded together in the contact state. Thus, five battery cells are connected in series.

In addition to the series connection terminal described above, the connection terminals include an output terminal connected to the positive electrode terminal of the battery cell positioned at the highest potential among the five series-connected battery cells, and a battery cell positioned at the lowest potential. and a ground terminal connected to the negative terminal of the cell. The output terminal is welded to the positive terminal of the highest potential battery cell. The ground terminal is welded to the negative terminal of the lowest potential battery cell.

The battery cell with the highest potential and the battery cell with the lowest potential are included in the first battery stack. These two battery cells are positioned at both ends of the three battery cells stacked in the z-direction in the first battery stack.

As described above, circuit board 20 has wiring board 21 and BMU 22 . The wiring board 21 is a printed board in which a wiring pattern made of a conductive material is formed on an insulating substrate. A first power supply line 23, a second power supply line 24, a third power supply line 25, and a fourth power supply line 26 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 arranged in the x direction with the highest potential battery cells. That is, the wiring board 21 is aligned in the x direction with the battery cell positioned at the end of the first battery stack.

Terminals electrically connected to the wiring pattern are formed on the wiring board 21 . The terminals include a first internal terminal 28a, a second internal terminal 28b, a third internal terminal 28c, and a fourth internal terminal 28d. The electrical connections between these wiring patterns and the internal terminals will be described later when the circuit configuration of the battery pack 100 is described.

The switch 30 has a first switch 31 , a second switch 32 , a third switch 33 , a fourth switch 34 , a fifth switch 35 and a sixth switch 36 . The first switch 31 and the second switch 32 are mounted on the housing 91 . Each of the third switch 33 to the sixth switch 36 is mounted on the wiring board 21 . The first switch 31 and the second switch 32 correspond to switches.

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

An IGBT or the like may be employed as the semiconductor switches included in the first to fourth switches 31 to 34 . In this case, a diode is connected in parallel with the IGBT.

The fifth switch 35 and the sixth switch 36 are mechanical relays. Specifically, the fifth switch 35 and the sixth switch 36 are normally closed electromagnetic relays. Therefore, the fifth switch 35 and the sixth switch 36 are opened by the input of the high level control signal. The fifth switch 35 and the sixth switch 36 are closed by the input of the low level control signal. In other words, the fifth switch 35 and the sixth switch 36 are closed when the high-level control signal ceases to be input.

Each of the first switch 31 to the fourth switch 34 has at least one opening/closing section formed by connecting two MOSFETs in series. The source electrodes of these two MOSFETs are connected together. The gate electrodes of the two MOSFETs are electrically independent. A MOSFET has a parasitic diode. The anode electrodes of the parasitic diodes of the two MOSFETs are connected to each other. The gate electrode described above is electrically connected to the circuit board 20 .

Each of the first switch 31 to the fourth switch 34 has a plurality of opening/closing sections. A plurality of opening/closing parts are connected in parallel. In the third switch 33 and the fourth switch 34, the source electrodes of two series-connected MOSFETs of a plurality of open/close portions are connected to each other.

In this embodiment, each of the first switch 31 to the fourth switch 34 has two opening/closing parts. The number of openings and closing sections and the form of connection such as parallel connection and series connection are appropriately determined according to the amount of current, redundancy, and the like.

Each of the first switch 31 to the fourth switch 34 has a resin portion covering 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 two main surfaces having the widest area.

As described above, the sensor section 40 is electrically connected to the electric circuit. The sensor unit 40 has sensor elements that detect the states of the assembled battery 10 and the switch 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 state signal of the assembled battery 10 . Also, the sensor unit 40 detects the temperature, current, and voltage of the switch 30 . The sensor unit 40 outputs it to the BMU 22 as a switch 30 status signal.

As representatives of these sensors, FIG. 1 shows a temperature sensor 41 that detects the temperature of the switch 30 and a current sensor 42 that detects the current flowing through the switch 30 . In this embodiment, a temperature sensor 41 and a current sensor 42 are provided for each of the first to fourth switches 31 to 34 .

A temperature sensor 41 is arranged adjacent to the switch 30 . Thereby, the heat generated by the switch 30 is transferred to the temperature sensor 41 . The temperature sensor 41 may be covered together with the opening/closing portion by the above resin portion. In this configuration, the temperature of the opening/closing portion is transferred to the temperature sensor 41 through the resin portion.

Temperature sensor 41 is specifically a diode. The forward voltage of the diode varies with temperature. BMU 22 detects this forward voltage. BMU 22 detects the temperature of switch 30 based on the detected forward voltage.

Current sensor 42 is connected in series with switch 30 . The current sensor 42 is specifically a shunt resistor. A shunt resistor is connected between the source electrodes of the two series-connected MOSFETs of the opening/closing section. A shunt resistor is provided independently for each of the two opening/closing sections of each of the first switch 31 and the second switch 32 mounted on the housing 91 . One shunt resistor is commonly provided for the two opening/closing portions of each of the third switch 33 and the fourth switch 34 mounted on the wiring board 21 . The reason why the shunt resistors are connected differently is that the amount of current flowing through the first switch 31 and the second switch 32 is larger than the amount of current flowing through the third switch 33 and the fourth switch 34 .

BMU 22 detects the voltage across this shunt resistor. BMU 22 stores the resistance value of the shunt resistor. BMU 22 detects the current flowing through switch 30 based on the detected voltage across it and the resistance value of the shunt resistor.

The sensor unit 40 has a submersion sensor in addition to the various sensors described above. This submersion sensor has two counter electrodes. When there is water between the two counter electrodes, the two counter electrodes are energized. This changes the resistance value between the two opposing electrodes. This change in resistance value is input to the BMU 22 as a state signal. BMU 22 detects submersion of battery pack 100 based on whether or not the change in resistance continues for a predetermined period of time.

BMU 22 controls switch 30 based on at least one of a state signal from sensor unit 40 and a command signal from host ECU 160 . BMU is an abbreviation for battery management unit.

As described above, each of the first to fourth switches 31 to 34 has a plurality of semiconductor switches. For example, when controlling the opening and closing of the first switch 31, the BMU 22 controls all the semiconductor switches of the first switch 31 to be closed or open at the same time. For example, the BMU 22 simultaneously outputs a high-level control signal or a low-level control signal to control electrodes (gate electrodes) of all semiconductor switches of the first switch 31 .

The BMU 22 may adjust the closing time of the semiconductor switch by intermittently outputting a high-level control signal during the period in which the semiconductor switch is closed. Briefly, the BMU 22 may pulse width control the semiconductor switches.

The BMU 22 determines the state of charge (SOC) of the assembled battery 10 and the abnormality of the switch 30 based on the status signal from the sensor section 40 . SOC is an abbreviation for state of charge. The BMU 22 outputs to the host ECU 160 signals (determination information) that determine these SOCs and abnormalities.

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

BMU 22 controls switch 30 based on a command signal from host ECU 160 . However, when the BMU 22 determines that the battery pack 100 is submerged from the state signal of the submersion sensor, it arbitrarily stops outputting the control signal to the switch 30 . As a result, the electrical connection of the assembled battery 10 is cut off.

Further, when the BMU 22 judges that the temperature detected by the temperature sensor 41 has risen to about the operation guarantee temperature of the switch 30 , the BMU 22 limits the driving of the switch 30 . Similarly, when the BMU 22 determines that the current detected by the current sensor 42 has risen to about the operation-guaranteed current of the switch 30, it limits the driving of the switch 30. FIG. For example, if the semiconductor switch of the switch 30 is pulse width controlled, the BMU 22 lowers its on-duty ratio. This shortens the conduction time of the semiconductor switch. As a result, heat generation of the semiconductor switch is suppressed. The BMU 22 corresponds to the restriction unit.

Power supply busbar 50 is made of a conductive material such as aluminum or copper. The power supply busbar 50 can be manufactured, for example, by the methods listed below. The power supply bus bar 50 can be manufactured by bending a single flat plate. The power supply bus bar 50 can be manufactured by integrally connecting a plurality of flat plates. The power supply busbar 50 can be manufactured by welding a plurality of flat plates. The power supply busbar 50 can be manufactured by pouring molten conductive material into a mold. The power supply bus bar 50 can also be manufactured by a manufacturing method different from the manufacturing methods enumerated above. A method for manufacturing the power supply bus bar 50 is not particularly limited. However, the power supply bus bar 50 of this embodiment is manufactured by bending a single flat plate.

Battery pack 100 has, as power supply busbars 50 , first power supply busbar 51 , second power supply busbar 52 , third power supply busbar 53 , and fourth power supply busbar 54 . The battery pack 10, the circuit board 20, the first switch 31, the second switch 32, and the external connection terminals are electrically connected to each other by these power supply bus bars. In FIG. 1 , each of these power supply bus bars is illustrated as being thicker than the power supply line of the wiring board 21 .

As described above, housing 91 has bottom wall 92 and side walls 93 . The bottom wall 92 has a flat shape with a thin thickness in the z direction. A side wall 93 rises in the z-direction from a bottom surface 92a of the bottom wall 92 facing in the z-direction. A terminal block 94 extends away from the bottom wall 92 in the y direction.

The terminal block 94 has a mounting surface 94a facing in the z direction. A resin base 96 having connection bolts 95 insert-molded onto the mounting surface 94a is fixed together with the filter substrate 71 by third bolts 90c. The shaft portion of the connection bolt 95 extends away from the mounting surface 94a in the z direction.

The battery pack 100 of this embodiment is provided below the seat of the vehicle. However, the arrangement of battery pack 100 is not limited to this. Battery pack 100 can also be placed, for example, in the space between the rear seat and the trunk, or in the space between the driver's seat and front passenger's seat.

<Circuit Configuration of Battery Pack>
Next, the circuit configuration of battery pack 100 will be described.

Note that the precharge resistor 60 and the filter 70 shown in FIG. 1 are also connected to this circuit. The precharge resistor 60 is mounted on the wiring board 21 . Filter 70 is connected to power supply bus bar 50 .

The connection between each power supply bus bar and each switch shown below is performed by TIG welding. Connection between each power supply bus bar and the external connection terminal is performed by bolting. The connection between each power supply bus bar and the circuit board 20 is performed by soldering. The connection between the power supply busbar and the filter is made by bolting. Each power supply bus bar and each switch may be connected by laser welding.

As shown in FIG. 1 , the first external connection terminal 100 a and one end of the first switch 31 are electrically connected via the first power supply bus bar 51 . A part is branched from the first power feeding bus bar 51 . A branch portion 51 a of the first power supply bus bar 51 is electrically connected to the first internal terminal 28 a of the wiring board 21 . A filter 70 is connected to the portion of the first power supply bus bar 51 connected to the first external connection terminal 100a.

The other end of the first switch 31 and the second external connection terminal 100 b are electrically connected via the second power supply bus bar 52 . A part is branched from the second power supply bus bar 52 . A branch portion 52 a of the second power supply bus bar 52 is electrically connected to one end of the second switch 32 . Also, the branch portion 52b is connected to the fourth internal terminal 28d. A filter 70 is connected to the portion of the second power supply bus bar 52 connected to the second external connection terminal 100b.

The other end of the second switch 32 and the positive electrode of the assembled battery 10 are electrically connected via the third power supply bus bar 53 . A part is branched from the third power feeding bus bar 53 . A branch portion 53 a of the third power supply bus bar 53 is electrically connected to the second internal terminal 28 b of the wiring board 21 . The negative electrode of the assembled battery 10 is electrically connected to the third external connection terminal 100c.

The first internal terminal 28 a and the second internal terminal 28 b of the wiring board 21 are electrically connected via the first feed line 23 . A third switch 33 and a fourth switch 34 are serially connected to the first feeder line 23 from the first internal terminal 28a toward the second internal terminal 28b.

The third internal terminal 28 c of the wiring board 21 and the middle point between the first internal terminal 28 a and the third switch 33 on the first feeder line 23 are electrically connected via the second feeder line 24 . The third internal terminal 28c is electrically connected to the fourth external connection terminal 100d through the fourth power supply bus bar 54. As shown in FIG.

A fifth switch 35 is provided on the second power supply line 24 . The midpoint between the third internal terminal 28c and the fifth switch 35 on the second feeder line 24 is connected to the midpoint between the third switch 33 and the fourth switch 34 on the first feeder line 23. there is

A middle point between the connection portion of the first feeder line 23 to the second feeder line 24 and the third switch 33, the third internal terminal 28c side of the fifth switch 35 in the second feeder line 24, and the first feeder line 23 is connected through a third power supply line 25 . A sixth switch 36 is provided on the third feeder line 25 .

A middle point between the connecting point of the first internal terminal 28a and the second feed line 24 in the first feed line 23 and the fourth internal terminal 28d are electrically connected via the fourth feed line 26. there is A precharge resistor 60 is provided on the fourth feeder line 26 .

As described above, the first switch 31, the second switch 32, the fourth switch 34, and the third switch 33 are sequentially connected in a ring. A midpoint between the first switch 31 and the second switch 32 is connected to the second external connection terminal 100b. A midpoint between the second switch 32 and the fourth switch 34 is connected to the assembled battery 10 . A midpoint between the fourth switch 34 and the third switch 33 is connected to the fourth external connection terminal 100d. A midpoint between the third switch 33 and the first switch 31 is connected to the first external connection terminal 100a.

Also, the first external connection terminal 100 a and the fourth external connection terminal 100 d are connected via the fifth switch 35 . A midpoint between the third switch 33 and the fourth switch 34 is connected via the fifth switch 35 to the first external connection terminal 100a. Similarly, the first external connection terminal 100 a and the fourth external connection terminal 100 d are connected via the sixth switch 36 . A midpoint between the third switch 33 and the fourth switch 34 is connected via the sixth switch 36 to the first external connection terminal 100a.

With the electrical connection configuration described above, 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 switch 31 . In other words, the electrical connection between storage battery 110 and rotating electric machine 130 is controlled by opening/closing control of first switch 31 .

The electrical connection between the second external connection terminal 100b and the assembled battery 10 is controlled by controlling the opening and closing of the second switch 32 . In other words, the electrical connection between the rotating electric machine 130 and the assembled battery 10 is controlled by controlling the opening/closing of the second switch 32 .

By controlling the opening and closing of the fourth switch 34, electrical connection between the second internal terminal 28b and the third internal terminal 28c is controlled. In other words, the electrical connection between the assembled battery 10 and the protective load 152 is controlled by controlling the opening/closing of the fourth switch 34 .

By controlling the opening and closing of the third switch 33, electrical connection between the first internal terminal 28a and the third internal terminal 28c is controlled. In other words, the electrical connection between the storage battery 110 and the protective load 152 is controlled by controlling the opening/closing of the third switch 33 .

By controlling the opening/closing of at least one of the fifth switch 35 and the sixth switch 36, electrical connection between the third internal terminal 28c and the first internal terminal 28a is controlled. In other words, the electrical connection between storage battery 110 and protective load 152 is controlled by controlling the opening/closing of at least one of fifth switch 35 and sixth switch 36 .

The first external connection terminal 100a and the second external connection terminal 100b are electrically connected via the precharge resistor 60. As shown in FIG. As described above, the second wire harness 220 is connected to the second external connection terminal 100b. A power converter (not shown) is connected to the second wire harness 220 .

The power converter has a large-capacity smoothing capacitor. A smoothing capacitor is used in a charged state. The smoothing capacitor is charged by electric power supplied from the storage battery 110 .

First wire harness 210 and second wire harness 220 are connected to battery pack 100 . As a result, electric charge is supplied from the storage battery 110 to the smoothing capacitor via the precharge resistor 60 . Through the precharge resistor 60 in this manner, a rapid increase in the amount of current flowing from the storage battery 110 to the smoothing capacitor is suppressed.

A filter 70 is connected to the side of the first power supply bus bar 51 that is connected to the first external connection terminal 100a. A filter 70 is connected to a portion of the second power supply bus bar 52 connected to the second external connection terminal 100b.

Therefore, for example, when electromagnetic noise input to the first wire harness 210 is propagated to the first external connection terminal 100 a, the electromagnetic noise is input to the filter 70 . Similarly, when electromagnetic noise input to the second wire harness 220 propagates to the second external connection terminal 100b, the electromagnetic noise is input to the filter 70 . The first power supply bus bar 51 and the second power supply bus bar 52 correspond to conductive portions.

<Connection type>
Next, based on FIG. 2, the connection form between the external connection terminals of the first power supply bus bar 51 and the second power supply bus bar 52, the circuit board 20, and the first switch 31 will be described. In FIG. 2, illustration of a connection portion (switch connection portion 56a) of the second power supply bus bar 52 to the second switch 32 is omitted. A second power supply bus bar 52 is shown superimposed on the first power supply bus bar 51 . The dashed line indicates the outline of the part of the first power supply busbar 51 that is hidden by the overlap of the second power supply busbar 52 . The notation of the filter 70 is omitted.

Each of the first power supply bus bar 51 and the second power supply bus bar 52 has a terminal connection portion 55, a common path portion 56, a switch connection portion 56a, an extension path portion 57, and a board connection portion 57a. In FIG. 2, the boundary between the terminal connection portion 55 and the common path portion 56 and the boundary between the common path portion 56 and the extended path portion 57 are indicated by dashed lines in order to clarify the boundaries of these components.

The terminal connection portion 55 of each of the first power supply bus bar 51 and the second power supply bus bar 52 is formed with a first through hole 55a for connecting to an external connection terminal. A second through hole 55 b for connecting to the filter 70 is formed in the terminal connection portion 55 .

As described above, each of the first external connection terminal 100 a and the second external connection terminal 100 b includes the connection bolt 95 , the resin base 96 insert-molded for the connection bolt 95 , and the first external connection terminal fastened to the shaft portion of the connection bolt 95 . It has a nut 97 and a second nut. A hole is formed in each metal terminal of the first wire harness 210 and the second wire harness 220 .

The shaft portion of the connection bolt 95 of the first external connection terminal 100 a is passed through the first through hole 55 a of the terminal connection portion 55 of the first power supply bus bar 51 . A first nut 97 is fastened to the shaft portion of the connection bolt 95 . As a result, the first power supply bus bar 51 is mechanically connected to the first external connection terminal 100 a by the first nut 97 .

The hole of the metal terminal of the first wire harness 210 is passed through the shaft portion of the connection bolt 95 of the first external connection terminal 100a. A second nut is fastened to the shaft portion of the connection bolt 95 . Thereby, the first wire harness 210 is mechanically connected to the first external connection terminal 100a by the second nut. The metal terminal of the first wire harness 210 and the terminal connection portion 55 of the first power supply bus bar 51 are electrically connected via the first nut 97 .

Similarly, the shaft portion of the connection bolt 95 of the second external connection terminal 100b is passed through the first through hole 55a of the terminal connection portion 55 of the second power supply bus bar 52 . A first nut 97 is fastened to the shaft portion of the connection bolt 95 . Thereby, the second power supply bus bar 52 is mechanically connected to the second external connection terminal 100b.

The hole of the metal terminal of the second wire harness 220 is passed through the shaft portion of the connection bolt 95 of the second external connection terminal 100b. A second nut is fastened to the shaft portion of the connection bolt 95 . Thereby, the second wire harness 220 is mechanically connected to the second external connection terminal 100b. The metal terminal of the second wire harness 220 and the terminal connection portion 55 of the second power supply bus bar 52 are electrically connected via the first nut 97 .

As shown in FIGS. 2 to 4, connection bolts 95 for the first external connection terminal 100a and the second external connection terminal 100b are insert-molded in a common resin base 96. As shown in FIG. The shaft portions of these two connection bolts 95 are spaced apart in the x direction. Accordingly, the terminal connection portion 55 of the first external connection terminal 100a and the terminal connection portion 55 of the second external connection terminal 100b connected to these connection bolts 95 are also spaced apart in the x direction. Along with this, the second through hole 55b formed in the terminal connection portion 55 of the first external connection terminal 100a and the second through hole 55b formed in the terminal connection portion 55 of the second external connection terminal 100b are also spaced apart in the x direction. lined up.

The resin base 96 is formed with mounting holes 96a for fixing itself to the terminal base 94 with third bolts 90c. The mounting hole 96a is positioned between the two connection bolts 95 in the x-direction. The mounting hole 96a is spaced apart from the middle point of the two connection bolts 95 in the y direction. The mounting hole 96 a and the two connection bolts 95 form vertices of an isosceles triangle on the resin base 96 .

The common path portion 56 integrally extends from the terminal connection portion 55 . The common path portion 56 functions to commonly flow both the current flowing to the first switch 31 and the current flowing to the circuit board 20 .

The switch connection portion 56 a extends from the common path portion 56 toward the first switch 31 . The drain terminal of the MOSFET of the first switch 31 and the switch connecting portion 56a are electrically and mechanically connected by TIG welding.

With the electrical connection configuration described above, the first external connection terminal 100a and the first switch 31 are connected via the terminal connection portion 55 of the first power supply bus bar 51, the common path portion 56, and the switch connection portion 56a. electrically connected. The second external connection terminal 100b and the first switch 31 are electrically connected via the terminal connection portion 55 of the second power supply bus bar 52, the common path portion 56, and the switch connection portion 56a. Although not shown, the second external connection terminal 100b and the second switch 32 are electrically connected via the terminal connection portion 55 of the second power supply bus bar 52, the common path portion 56, and the switch connection portion 56a. . The switch connection portion 56a of the second power supply bus bar 52 corresponds to the branch portion 52b shown in FIG.

Therefore, when electromagnetic noise is propagated to the terminal connection portion 55, the electromagnetic noise tries to enter the first switch 31 and the second switch 32 via the common path portion 56 and the switch connection portion 56a.

The extension path portion 57 extends away from the common path portion 56 . The extension path portion 57 functions to allow current to flow to the circuit board 20 .

The board connection portion 57 a extends from the extension path portion 57 toward the circuit board 20 . Through holes are formed in the circuit board 20 as first internal terminals 28a and fourth internal terminals 28d. The tip of the board connecting portion 57a is inserted into this through hole. Both are brazed by soldering or the like.

With the electrical connection configuration described above, the first external connection terminal 100a and the first internal terminal 28a of the circuit board 20 are connected to the terminal connection portion 55 of the first power supply bus bar 51, the common path portion 56, and the extension path portion 57. , and the board connecting portion 57a. Similarly, the second external connection terminal 100b and the fourth internal terminal 28d of the circuit board 20 are connected to the terminal connection portion 55 of the second power supply bus bar 52, the common path portion 56, the extension path portion 57, and the board connection portion 57a. are electrically connected via The extension path portion 57 and the board connection portion 57a of the first power supply bus bar 51 correspond to the branch portion 51a shown in FIG. The extension path portion 57 and the board connection portion 57a of the second power supply bus bar 52 correspond to the branch portion 52b shown in FIG.

As described above, the first feed line 23 is connected to the first internal terminal 28a. A third switch 33 is provided on the first feeder line 23 . A third feeder line 25 is connected to a midpoint between the first internal terminal 28 a and the third switch 33 on the first feeder line 23 . A third power supply line 25 is connected to the fourth internal terminal 28d. A precharge resistor 60 is provided on the third feeder line 25 .

Therefore, for example, when electromagnetic noise input to the first wire harness 210 is propagated to the terminal connection portion 55 of the first power supply bus bar 51, the electromagnetic noise propagates through the common path portion 56, the extension path portion 57, and the substrate connection portion. An attempt is made to input to the circuit board 20 via 57a. When the electromagnetic noise input to the second wire harness 220 is propagated to the terminal connection portion 55 of the second power supply bus bar 52, the electromagnetic noise passes through the common path portion 56, the extension path portion 57, and the substrate connection portion 57a. input to the circuit board 20. Electromagnetic noise tries to enter the third switch 33 and the precharge resistor 60 mounted on the circuit board 20 .

As described above, the external connection terminals and the first switch 31 are electrically connected via the terminal connection portion 55, the common path portion 56, and the switch connection portion 56a. Similarly, the external connection terminal and the second switch 32 are electrically connected via the terminal connection portion 55, the common path portion 56, and the switch connection portion 56a. On the other hand, the external connection terminals and the circuit board 20 are electrically connected via the terminal connection portion 55, the common path portion 56, the extension path portion 57, and the board connection portion 57a.

The switch connection portion 56a and the substrate connection portion 57a have the same electrical resistance. Therefore, the electrical resistance between the terminal connection portion 55 and the first switch 31 in the current path is lower than the electrical resistance between the terminal connection portion 55 and the circuit board 20 by the electrical resistance of the extension path portion 57. It's becoming Similarly, the electrical resistance between the terminal connection portion 55 and the second switch 32 in the current path is lower than the electrical resistance between the terminal connection portion 55 and the circuit board 20 . Therefore, the electromagnetic noise input to the terminal connection portion 55 is easily propagated to the first switch 31 and the second switch 32 mounted on the housing 91 instead of the circuit board 20 .

On the other hand, the filter 70 is connected to the first power supply bus bar 51 and the second power supply bus bar 52 as described above. This suppresses the input of electromagnetic noise to the first switch 31 and the second switch 32 mounted on the housing 91 . Also, the input of electromagnetic noise to the circuit board 20 is suppressed. The filter 70 will be described in detail below.

<Filter>
The filter 70 has a filter substrate 71 and a first noise countermeasure element 72 and a second noise countermeasure element 73 mounted on the filter substrate 71 . The filter 70 also has a metal first connection terminal 74 and a second connection terminal 75 that are connected to the filter substrate 71 .

The filter substrate 71 is a printed circuit board in which conductive wiring is formed on a flat insulating substrate. As shown in FIG. 2, the insulating substrate is T-shaped in the plane facing the z-direction. A conductive pattern is formed on one surface of the insulating substrate. A through-hole is formed in the insulating substrate so as to extend through the one surface and the back surface.

The first noise countermeasure element 72 and the second noise countermeasure element 73 are electrically connected to the conductive pattern formed on the insulating substrate. The conductive pattern includes a first conductive wiring 71a connected to one end of the first noise countermeasure element 72, a second conductive wiring 71b connected to one end of the second noise countermeasure element 73, and a second conductive wiring 71b connected to one end of the second noise countermeasure element 73. There is a third conductive line 71c that is connected. The first conductive wiring 71a, the second conductive wiring 71b, and the third conductive wiring 71c correspond to conductive patterns.

A conductive pattern is electrically connected to a through hole formed in the insulating substrate. The through holes include a first through hole 71d connected to the first conductive wiring 71a, a second through hole 71e connected to the second conductive wiring 71b, and a third through hole connected to the third conductive wiring 71c. There is a hole 71f. The first through hole 71d and the second through hole 71e are separated in the x direction. The third through hole 71f is spaced apart in the y direction from the midpoint between the first through hole 71d and the second through hole 71e. These three through holes form the vertices of an isosceles triangle on one side and the back side of the insulating substrate. The first through hole 71d and the second through hole 71e correspond to first terminals. The third through hole 71f corresponds to the second terminal.

The first noise countermeasure element 72 and the second noise countermeasure element 73 are, as their names indicate, electronic elements that function to remove electromagnetic noise. Specifically, the first noise countermeasure element 72 and the second noise countermeasure element 73 of this embodiment are capacitors. One of the two electrodes of the first noise countermeasure element 72 is connected to the first conductive wiring 71a. One of the two electrodes of the second noise countermeasure element 73 is connected to the second conductive wiring 71b. The other of the two electrodes of each of the first noise countermeasure element 72 and the second noise countermeasure element 73 is connected to the third conductive wiring 71c.

Note that the first noise countermeasure element 72 and the second noise countermeasure element 73 are not limited to the above examples as long as they are an electronic element capable of removing electromagnetic noise or a filter circuit composed of a plurality of electronic elements. For example, a chip bead, a low-pass filter circuit, or the like can be used as the noise countermeasure element.

The first connection terminal 74 and the second connection terminal 75 are formed by pressing a metal flat plate. The first connection terminal 74 and the second connection terminal 75 are each bent in an L shape. One end of each of the first connection terminal 74 and the second connection terminal 75 is formed with a plurality of projections for insertion into the through holes. A through hole for fixing to the terminal connection portion 55 is formed at the other end of each of the first connection terminal 74 and the second connection terminal 75 .

A plurality of protrusions formed at one end of the first connection terminal 74 are inserted into the first through hole 71d. These multiple protrusions are connected to the filter substrate 71 by soldering or the like. Thereby, the first connection terminal 74 is electrically connected to the first through hole 71d and the first conductive wiring 71a. As a result, the first connection terminal 74 is electrically connected to one end of the first noise countermeasure element 72 .

A shaft portion of a first bolt 90a shown in FIG. A nut is fastened to the shaft portion of the first bolt 90a. The other end of the first connection terminal 74 and the formation portion of the second through hole 55b of the terminal connection portion 55 of the first power supply bus bar 51 are held between the head of the first bolt 90a and the nut. Thereby, the other end of the first connection terminal 74 and the terminal connection portion 55 of the first power supply bus bar 51 are electrically and mechanically connected. As a result, the terminal connection portion 55 of the first power supply bus bar 51 and one end of the first noise countermeasure element 72 are electrically connected via the first connection terminal 74 and the first conductive wiring 71a.

Similarly, a plurality of protrusions formed at one end of the second connection terminal 75 are inserted into the second through holes 71e. A plurality of protrusions are connected to the filter substrate 71 by soldering or the like. Thereby, the second connection terminal 75 is electrically connected to the second through hole 71e and the second conductive wiring 71b. As a result, the second connection terminal 75 is electrically connected to one end of the second noise countermeasure element 73 .

The shaft portion of the second bolt 90 b is passed through the through hole formed at the other end of the second connection terminal 75 and the second through hole 55 b of the terminal connection portion 55 of the second power supply bus bar 52 . A nut is fastened to the shaft portion of the second bolt 90b. The other end of the second connection terminal 75 and the formation portion of the second through hole 55b of the terminal connection portion 55 of the second power supply bus bar 52 are held between the head of the second bolt 90b and the nut. Thereby, the other end of the second connection terminal 75 and the terminal connection portion 55 of the second power supply bus bar 52 are electrically and mechanically connected. As a result, the terminal connection portion 55 of the second power supply bus bar 52 and one end of the second noise countermeasure element 73 are electrically connected via the second connection terminal 75 and the second conductive wiring 71b. The resin base 96 may be formed with through holes for inserting the shaft portions of the first bolt 90a and the second bolt 90b.

Also, the shaft portion of the third bolt 90c is inserted into the third through hole 71f. A shaft portion of the third bolt 90 c is fastened to the mounting hole 96 a of the resin base 96 . The portion where the third through hole 71f of the filter substrate 71 is formed is sandwiched between the head of the third bolt 90c and the resin base 96. As shown in FIG. As a result, the filter substrate 71 is mechanically fixed to the resin base 96 .

Further, the distal end side of the shaft portion of the third bolt 90 c is fastened to the terminal block 94 . As a result, the third through hole 71 f and the third conductive wiring 71 c are electrically connected to the housing 91 . As a result, the third through hole 71f and the third conductive wiring 71c become the ground potential. The other ends of the first noise countermeasure element 72 and the second noise countermeasure element 73 are electrically connected to the ground.

As described above, one end of the first noise countermeasure element 72 is connected to the terminal connection portion 55 of the first power supply bus bar 51 as shown in FIG. One end of the second noise countermeasure element 73 is connected to the terminal connection portion 55 of the second power supply bus bar 52 . The other end of each of the first noise countermeasure element 72 and the second noise countermeasure element 73 is connected to the ground.

<Effect>
As described above, the first wire harness 210 and the second wire harness 220 are each laid around in the vehicle. Therefore, electromagnetic noise is likely to be input to these wire harnesses. Electromagnetic noise is likely to be input to the external connection terminals of the battery pack 100 to which these wire harnesses are connected.

A first external connection terminal 100 a to which the first wire harness 210 is connected is electrically connected to the circuit board 20 and the first switch 31 via the first power supply bus bar 51 . A second external connection terminal 100 b to which the second wire harness 220 is connected is electrically connected to the circuit board 20 , the first switch 31 , and the second switch 32 via the second power supply bus bar 52 . Therefore, the electromagnetic noise input to the first external connection terminal 100a and the second external connection terminal 100b tries to input to the circuit board 20, the first switch 31, and the second switch 32, respectively.

As described above, the electrical resistance between the terminal connection portion 55 and the first switch 31 in the current path is lower than the electrical resistance between the terminal connection portion 55 and the circuit board 20 . The electrical resistance between the terminal connection portion 55 and the second switch 32 is lower than the electrical resistance between the terminal connection portion 55 and the circuit board 20 .

Therefore, the electromagnetic noise input to the first external connection terminal 100a and the second external connection terminal 100b is likely to be input to the first switch 31 and the second switch 32 mounted on the housing 91 instead of the circuit board 20. .

On the other hand, a filter 70 is connected to the terminal connection portion 55 of the first power supply bus bar 51 . A filter 70 is connected to the terminal connection portion 55 of the second power supply bus bar 52 .

Therefore, the electromagnetic noise input to the terminal connection portion 55 of the first power supply bus bar 51 is input to the filter 70 before being propagated to the switch connection portion 56a and the board connection portion 57a located in the subsequent stage. The electromagnetic noise input to the terminal connection portion 55 of the second power supply bus bar 52 is input to the filter 70 before being propagated to the switch connection portion 56a and the board connection portion 57a located at the subsequent stage.

This suppresses the inflow of electromagnetic noise to the first switch 31 and the second switch 32 mounted on the housing 91 . Inflow of electromagnetic noise to the circuit board 20 is suppressed. Input of electromagnetic noise to the third switch 33 mounted on the circuit board 20 is suppressed.

Therefore, the inflow of electromagnetic noise to the diode of the temperature sensor 41 arranged adjacent to each switch via the parasitic capacitance between the switch and the temperature sensor 41 is suppressed. Inflow of electromagnetic noise to the shunt resistor of the current sensor 42 connected in series with each switch is suppressed. As a result, a decrease in temperature detection accuracy of each switch is suppressed. This suppresses deterioration in detection accuracy of the current flowing through each switch.

As described above, BMU 22 limits the driving of switch 30 based on the temperature detected by temperature sensor 41 . BMU 22 limits the driving of switch 30 based on the current detected by current sensor 42 . On the other hand, by suppressing the inflow of electromagnetic noise to the switch 30 as described above, the deterioration of the temperature and current detection accuracy is suppressed. This prevents the electromagnetic noise from destabilizing the control of the drive limitation of the switch 30 .

A first connection terminal 74 and a second connection terminal 75 are connected to the filter substrate 71 . A first connection terminal 74 is electrically and mechanically connected to the first power supply bus bar 51 by a first bolt 90a and a nut. A second connection terminal 75 is electrically and mechanically connected to the second power supply bus bar 52 by a second bolt 90b and a nut.

According to this, unlike the configuration in which the filter board 71 is bolted to the first power supply bus bar 51 and the second power supply bus bar 52 , stress due to bolting is suppressed from acting on the filter board 71 . The distortion of the filter substrate 71 is suppressed. As a result, the occurrence of electrical connection failure between each of the first noise countermeasure element 72 and the second noise countermeasure element 73 and the conductive wiring is suppressed.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present disclosure.

(First modification)
In this embodiment, an example in which the filter 70 has the first connection terminal 74 and the second connection terminal 75 is shown. However, the filter 70 may not have the first connection terminal 74 and the second connection terminal 75 . This suppresses an increase in the number of parts.

For example, in the modification shown in FIG. 5 , the shaft portion of the first bolt 90 a is passed through the first through hole 71 d of the filter substrate 71 and the second through hole 55 b of the terminal connection portion 55 of the first power supply bus bar 51 . A nut is fastened to the shaft portion of the first bolt 90a. The portion where the first through hole 71d is formed in the filter substrate 71 and the portion where the second through hole 55b of the terminal connection portion 55 of the first power supply bus bar 51 is formed are sandwiched between the head of the first bolt 90a and the nut. .

As a result, the filter substrate 71 and the first power supply bus bar 51 are mechanically connected. The first through holes 71d of the filter substrate 71 and the terminal connection portions 55 of the first power supply bus bar 51 are electrically connected. As a result, one end of the first noise countermeasure element 72 and the terminal connection portion 55 of the first power supply bus bar 51 are electrically connected via the first conductive wiring 71a.

Similarly, the shaft portion of the second bolt 90b is passed through the second through hole 71e of the filter substrate 71 and the second through hole 55b of the terminal connection portion 55 of the second power supply bus bar 52 . A nut is fastened to the shaft portion of the second bolt 90b. The portion of the filter substrate 71 where the second through hole 71e is formed and the portion where the second through hole 55b of the terminal connection portion 55 of the second power supply bus bar 52 is formed are sandwiched between the head of the second bolt 90b and the nut. .

As a result, the filter substrate 71 and the second power supply bus bar 52 are mechanically connected. The second through holes 71e of the filter substrate 71 and the terminal connection portions 55 of the second power supply bus bar 52 are electrically connected. As a result, one end of the second noise suppression element 73 and the terminal connection portion 55 of the second power supply bus bar 52 are electrically connected via the second conductive wiring 71b.

(Second modification)
For example, as shown in FIG. 6, a configuration in which connection pins 55c protruding in the z-direction are formed on the terminal connection portions 55 of the first power supply bus bar 51 and the second power supply bus bar 52 may be employed.

The connection pin 55c of the first power supply bus bar 51 is passed through the first through hole 71d. Both are electrically and mechanically connected by soldering or the like. Similarly, the connection pin 55c of the second power supply bus bar 52 is passed through the second through hole 71e. Both are electrically and mechanically connected by solder or the like.

This configuration also electrically connects one end of the first noise countermeasure element 72 and the terminal connection portion 55 of the first power supply bus bar 51 . One end of the second noise countermeasure element 73 and the terminal connection portion 55 of the second power supply bus bar 52 are electrically connected.

The filter substrate 71 shown in FIG. 6 is formed with an arrangement hole 71g for defining the arrangement of the filter substrate 71 on the resin base 96. As shown in FIG. The resin base 96 is formed with an arrangement pin 96b that is passed through the arrangement hole 71g.

The arrangement hole 71g penetrates through one surface and the back surface of the insulating substrate of the filter substrate 71 . The arrangement hole 71g is open in the z direction. The locating pin 96b extends in the z-direction. The arranging pin 96b is passed through the arranging hole 71g. Displacement of the filter substrate 71 in the direction orthogonal to the z-direction is suppressed by contact between the wall surface of the arranging hole 71g and the arranging pin 96b. This defines the arrangement of the filter substrate 71 in the direction orthogonal to the z-direction.

(Third modification)
For example, as shown in FIG. 7, it is also possible to employ a configuration in which the connection bolt 95 is passed through the first through hole 71d and the second through hole 71e. This eliminates the need for the first bolt 90a and the second bolt 90b. An increase in the number of parts is suppressed.

Both the first through hole 55a of the terminal connection portion 55 of the first power supply bus bar 51 and the first through hole 71d of the filter substrate 71 are passed through the shaft portion of the connection bolt 95 of the first external connection terminal 100a. The first nut 97 , the hole of the metal terminal of the first wire harness 210 , and the second nut are passed through the shaft portion of the connection bolt 95 . A first nut 97 and a second nut are fastened to the shaft portion of the connection bolt 95 . As a result, the first through holes 71d of the filter substrate 71 and the terminal connection portions 55 of the first power supply bus bar 51 are electrically connected.

Similarly, the shaft portion of the connection bolt 95 of the second external connection terminal 100b is passed through both the first through hole 55a of the terminal connection portion 55 of the second power supply bus bar 52 and the second through hole 71e of the filter substrate 71 . The first nut 97 , the hole of the metal terminal of the second wire harness 220 , and the second nut are passed through the shaft portion of the connection bolt 95 . A first nut 97 and a second nut are fastened to the shaft portion of the connection bolt 95 . Thereby, the second through holes 71e of the filter substrate 71 and the terminal connection portions 55 of the second power supply bus bar 52 are electrically connected.

(Fourth modification)
In this embodiment, an example in which the filter 70 includes the first noise countermeasure element 72 and the second noise countermeasure element 73 mounted on the filter substrate 71 is shown. However, filter 70 may not have filter substrate 71 . Although not shown, it is also possible to employ a configuration in which the terminals of the noise countermeasure element are directly connected to the power supply bus bar.

(Fifth Modification)
As described above, the terminal block 94 is positioned outside the storage space. Therefore, the external connection terminals, the terminal connection portion 55 of the power supply bus bar 50, and the filter 70 are positioned outside the housing space. Therefore, for example, as shown in FIG. 8, it is possible to employ a configuration in which a protective cover 98 is provided on the resin base 96 of the external connection terminals to protect them from water by covering them.

A protective space is formed between the two by providing the protective cover 98 on the resin base 96 . The connection bolt 95, the terminal connection portion 55, the first nut 97, and the filter 70 are accommodated in this protective space.

The protective cover 98 is formed with a through hole 98a that opens in the z direction. The tip side of the shaft portion of the connection bolt 95 protrudes outward from the protective space through the through hole 98a. A metal terminal of a wire harness and a second nut are attached to the distal end side of the shaft portion of the connection bolt 95 projecting from the through hole 98a.

A plurality of mounting holes 98b opening in the z-direction are formed around the openings of the through holes 98a on the outer surface of the protective cover 98. As shown in FIG. Correspondingly, the metal terminal of the wire harness is formed with a protrusion that is inserted into the mounting hole 98b.

A metal terminal of the wire harness is passed through the tip of the shaft portion of the connection bolt 95 projecting out from the through hole 98a. At the same time, the protrusions formed on the metal terminals of the wire harness are passed through the mounting holes 98b of the protective cover 98. As shown in FIG. In this state, the second nut is fastened to the tip of the shaft portion of the connection bolt 95 . The second nut moves toward the protective cover 98 while spirally rotating around the shaft of the connection bolt 95 extending in the z direction. At this time, the second nut rotates in the circumferential direction around the z-direction. When the second nut contacts the metal terminal of the second wire harness, the rotational movement of the second nut acts on the metal terminal of the wire harness. As a result, the metal terminal of the wire harness also tends to rotate in the circumferential direction around the z-direction together with the second nut.

On the other hand, as described above, the projection of the metal terminal of the wire harness is passed through the mounting hole 98b of the protective cover 98 that opens in the z direction. Therefore, the rotation of the metal terminal in the circumferential direction around the z-direction is suppressed by the contact between the protrusion and the wall surface forming the mounting hole 98b.

(Sixth modification)
In this embodiment, an example in which the filter 70 is connected to the terminal connection portion 55 is shown. However, filter 70 may be connected to common path section 56 .

(Seventh Modification)
In the present embodiment, no particular countermeasures against electromagnetic noise input from the fourth external connection terminal 100d to which the first wire harness 210 is connected to the third internal terminal 28c of the circuit board 20 via the fourth power supply bus bar 54 are mentioned. . If electromagnetic noise is input to the third internal terminal 28c, the electromagnetic noise may be input to the third switch 33 and the fourth switch 34, respectively.

Such a problem can be eliminated by providing a filter between the third switch 33 and the fourth switch 34 in the first feeder line 23 . In this way, when the energization path of the power supply bus bar is only the external connection terminal and the circuit board, by providing the circuit board 20 with a filter, the electromagnetic noise to the third switch 33 and the fourth switch 34 mounted on the circuit board 20 can be prevented. Input is suppressed.

(Eighth modification)
In this embodiment, the first external connection terminal 100a and the second external connection terminal 100b, and the filter 70 are provided on the mounting surface 94a of the terminal block 94 extending in the y-direction away from the bottom wall 92. Indicated. However, a configuration in which a part of the filter 70 is positioned in the air by separating a part of the filter 70 from the mounting surface 94a in a direction orthogonal to the z direction can also be adopted. In this case, for example, a part of the filter 70 is separated from the mounting surface 94a in the x direction. According to this, part of the filter 70 is aligned with the terminal block 94 in the x-direction. Therefore, unlike the configuration in which a portion of filter 70 is positioned apart from mounting surface 94a in the y direction, an increase in size of battery pack 100 in the y direction is suppressed.

(Other modifications)
Each embodiment shows an example in which the assembled battery 10 has five battery cells. However, the assembled battery 10 only needs to have a plurality of battery cells, and is not limited to the above example. Also, the number of battery stacks may be one or three or more instead of two. Furthermore, a battery stack may be configured by arranging battery cells in the x direction.

Each embodiment has shown an example in which the vehicle equipped with the power supply system 200 has the idle stop function. However, the vehicle equipped with 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 rotating electric machine 130 shown in this embodiment are replaced with the motor generator.

DESCRIPTION OF SYMBOLS 10... Assembled battery 20... Circuit board 21... Wiring board 22... BMU 31... First switch 32... Second switch 41... Temperature sensor 42... Current sensor 51... First feeding bus bar 52... Second power supply bus bar 55 Terminal connection portion 56 Common path portion 56a Switch connection portion 57 Extension path portion 57a Substrate connection portion 70 Filter 71 Filter substrate 71a First conductive wiring , 71b... second conductive wiring, 71c... third conductive wiring, 71d... first through-hole, 71e... second through-hole, 71f... third through-hole, 72... first noise countermeasure element, 73... second noise countermeasure Elements 74 First connection terminal 75 Second connection terminal 91 Housing 100 Battery pack 100a First external connection terminal 100b Second external connection terminal 110 Storage battery 120 Starter motor , 130... rotating electric machine, 150... electrical load, 151... general load, 152... protective load 152, 160... host ECU, 200... power supply system, 210... first wire harness, 220... second wire harness

Claims (8)

a battery (10);
a circuit board (20);
a housing (91) housing the battery and the circuit board;
switches (31, 32) provided on the housing;
input/output terminals (100a, 100b) connected to external devices (110, 120, 130, 151);
Conductive portions (51, 52) electrically and mechanically connecting the input/output terminal and the circuit board, and the input/output terminal and the switch, respectively;
a filter (70) for removing electromagnetic noise input to the conductive part;
electrical resistance between the input/output terminal and the switch in the conductive portion is lower than electrical resistance between the input/output terminal and the circuit board;
The battery pack, wherein the filter is mechanically and electrically connected between the input/output terminal and the switch on the conductive portion. The conductive portion includes a terminal connection portion (55) connected to the input/output terminal, a common path portion (56) extending from the terminal connection portion, and a switch connection portion extending from the common path portion and connected to the switch. (56a), an extension path portion (57) extending away from the common path portion, and a board connection portion (57a) extending from the extension path portion and connected to the circuit board,
2. The battery pack according to claim 1, wherein said filter is connected to said terminal connection portion. The conductive portion includes a terminal connection portion (55) connected to the input/output terminal, a common path portion (56) extending from the terminal connection portion, and a switch connection portion extending from the common path portion and connected to the switch. (56a), an extension path portion (57) extending away from the common path portion, and a board connection portion (57a) extending from the extension path portion and connected to the circuit board,
The battery pack according to claim 1, wherein said filter is connected to said common path portion. The housing is grounded, and
The filter has noise countermeasure elements (72, 73) and a filter substrate (71) on which the noise countermeasure elements are mounted,
The filter substrate includes first terminals (71d, 71e) electrically connected to the conductive portion, second terminals (71f) electrically connected to the housing, and the first terminal and the second terminal. 3. The battery pack according to claim 1, further comprising a conductive pattern (71a to 71c) connecting each of the two terminals and the noise countermeasure element. The filter has connection terminals ( 74, 75) coupled to the first terminals of the filter substrate in addition to the noise countermeasure element and the filter substrate,
5. The battery pack according to claim 4, wherein said connection terminal is mechanically and electrically connected to said conductive portion. The battery pack according to any one of claims 1 to 5, wherein wire harnesses (210, 220) are connected to said input/output terminals. a temperature sensor (41) for detecting the temperature of the switch;
The battery pack according to any one of claims 1 to 6, further comprising a limiting section (22) for limiting driving of the switch based on the temperature detected by the temperature sensor. a current sensor (42) for detecting current flowing through the switch;
The battery pack according to any one of claims 1 to 7, further comprising a limiting section (22) for limiting driving of the switch based on the current detected by the current sensor.

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