JP2018207631A - Monitoring device of battery pack, and on-vehicle electric power supply device - Google Patents

Abstract

To enable simplification and space-saving of wiring configuration in a power supply device.SOLUTION: A monitoring device of a battery pack includes: a plurality of connection lines each connected to a cathode and an anode of each of a plurality of unit batteries; a high-side power supply line and a low-side power supply line for supplying operating power of the monitoring device; a voltage detection section for detecting each inter-terminal voltage of the plurality of unit batteries through the plurality of connection lines; a switch section capable of individually switching connection states between each of the plurality of connection lines and each of the high-side power supply line and the low-side power supply line; and a control section for controlling the switch section so that a cathode of at least one of the unit batteries is connected to the high-side power supply line, and an anode of the one unit battery is connected to the low-side power supply line.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an assembled battery monitoring device and an in-vehicle power supply device.

  In a power storage device that requires high output, such as an electric vehicle or a hybrid vehicle, generally, an assembled battery configured by connecting a plurality of unit batteries in series is used (for example, see Patent Document 1). reference).

JP, 2006-050870, A

  By the way, in this type of power storage device, in general, a high voltage power line for supplying power from the output terminal of the assembled battery, and for supplying control power to the monitoring IC for monitoring the assembled battery from the control power supply. And a signal line as a communication line for the monitoring IC. Note that in a low voltage voltage system such as a monitoring IC, a high voltage power output from an assembled battery is normally converted into a low voltage via a DC / DC converter provided outside the power storage device. Used as a control power source.

  The wiring configuration of such a power storage device is a wiring design in consideration of mutual insulation and electromagnetic interference with signal lines in addition to a large number of wirings being routed to the outside as described above. Therefore, the wiring is complicatedly routed and has a problem of eroding the in-car area.

  The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide an assembled battery monitoring device and an in-vehicle power supply device that can simplify the wiring configuration and save space in the power storage device. .

The main present disclosure for solving the above-described problems is as follows.
An assembled battery monitoring device configured by connecting a plurality of unit cells in series,
A plurality of connection lines connected to the positive and negative electrodes of each of the plurality of unit cells;
A high-side power line and a low-side power line for supplying operating power of the monitoring device;
A voltage detection unit that detects a voltage between terminals of each of the plurality of unit batteries via the plurality of connection lines;
A switch unit capable of individually switching a connection state between each of the plurality of connection lines and each of the high-side power supply line and the low-side power supply line;
Based on the inter-terminal voltage of each of the plurality of unit cells, the positive electrode of at least one unit cell is connected to the high-side power line, and the negative electrode of the one unit cell is connected to each of the low-side power lines. And a control unit for controlling the switch unit,
A battery pack monitoring device.

In other aspects,
An in-vehicle power supply device comprising the assembled battery monitoring device.

  According to the assembled battery monitoring device according to the present disclosure, the wiring configuration in the power storage device can be simplified and the space can be saved.

The figure which shows an example of the circuit structure of the monitoring apparatus of the assembled battery which concerns on 1st Embodiment. The figure explaining the supply path which supplies operating power from the unit battery with respect to the voltage detection part in the monitoring apparatus of the assembled battery which concerns on 1st Embodiment. The flowchart which shows an example of operation | movement of the monitoring apparatus which concerns on 1st Embodiment. The figure explaining the equalization of the voltage between the terminals of a unit battery in the monitoring apparatus which concerns on 1st Embodiment. The flowchart which shows an example of operation | movement of the monitoring apparatus which concerns on the modification 1 of 1st Embodiment. The flowchart which shows an example of operation | movement of the monitoring apparatus which concerns on the modification 2 of 1st Embodiment. The figure which shows an example of the circuit structure of the monitoring apparatus of the assembled battery which concerns on the modification 3 of 1st Embodiment. The figure which shows an example of a structure of the vehicle-mounted power supply device containing the monitoring apparatus which concerns on 2nd Embodiment.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the appended drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
[Configuration of assembled battery monitoring device]
Hereinafter, an example of the configuration of the assembled battery monitoring device according to the present embodiment will be described with reference to FIGS. 1 and 2. The monitoring device 10 of the assembled battery 20 according to the present embodiment is applied to, for example, a power storage device 100 mounted on an electric vehicle, a hybrid vehicle, or the like.

  FIG. 1 is a diagram illustrating an example of a circuit configuration of the monitoring device 10 of the assembled battery 20 according to the present embodiment.

  First, the configuration of the assembled battery 20 to which the monitoring device 10 is connected will be described.

  The assembled battery 20 is configured by connecting a plurality of unit batteries E1 to E2 in series via connection terminals P1 to P3. In FIG. 1, only two representative unit batteries E1 to E2 are shown among a plurality of unit batteries constituting the assembled battery 20, but the number of connections is arbitrary. In the following description, the arrangement of each component is referred to as “unit battery E”, “connection terminals P1 to P3”, “connection lines L1 to L3”, and the like unless otherwise distinguished.

  Each unit battery E is, for example, a lithium ion secondary battery, an electric double layer capacitor, or the like, and is configured by a series connection body of one or a plurality of battery cells. In the present embodiment, the number of battery cells constituting the unit battery E is the same, but the number may be different from each other.

  Connection lines L1 to L3 are connected to connection terminals P1 to P3 of each unit battery E. And each unit battery E detects the voltage between terminals via the connection lines L1-L3, and the discharge for equalizing the voltage between terminals is implemented. Each unit battery E also has a role of supplying operating power of each unit (voltage detection unit 12 and the like in the drawing) of the monitoring device 10 of the assembled battery 20 (details will be described later).

  The assembled battery 20 uses the positive electrode of the unit battery E on the highest potential side and the negative electrode of the unit battery E on the lowest potential side of the plurality of unit batteries E as output terminals (not shown), and via the output terminals at both ends. , Output high voltage DC power.

  The monitoring device 10 according to the present embodiment detects the inter-terminal voltage of each unit battery E of the assembled battery 20 and discharges each unit battery E individually from each unit battery E in order to equalize the inter-terminal voltage of each unit battery E. Let

  The monitoring apparatus 10 according to the present embodiment includes a control unit 11, a voltage detection unit 12, and a switch unit 13. The monitoring device 10 according to the present embodiment includes the connection lines L1 to L3, the high-side power line (hereinafter referred to as “high-side power line”) Lta, and the low-side power line (hereinafter “ Ltb) (referred to as “low-side power supply line”).

  The voltage detector 12 detects the voltage between the terminals of each unit battery E via the connection lines L1 to L3.

  Specifically, the voltage detection unit 12 detects the voltage between the terminals of the unit battery E1 based on the potential difference between the connection line L1 and the connection line L2, and the voltage of the unit battery E2 based on the potential difference between the connection line L2 and the connection line L3. Detect voltage between terminals. The voltage detection unit 12 transmits a detection signal related to the inter-terminal voltage of each unit battery E to the control unit 11.

  The voltage detection unit 12 includes, for example, a multiplexer that selects two of the connection lines L1 to L3 based on a control signal from the control unit 11, and a sensor unit that detects a potential difference between the two selected lines. And comprising.

  The switch unit 13 includes, for example, switches SW1a, SW2a, and SW3a for connecting the positive electrode of each unit battery E to the high-side power supply line Lta, and the switch SW1b for connecting the negative electrode of each unit battery E to the low-side power supply line Ltb. SW2b and SW3b are provided. Note that these switches SW1a, SW2a, SW3a, SW1b, SW2b, and SW3b are constituted by, for example, semiconductor switches or relays.

  The switch unit 13 switches between the connection lines L1 to L3 and the high-side power supply line Lta and the low-side power supply line Ltb by switching on / off of the switches SW1a, SW2a, SW3a, SW1b, SW2b, and SW3b. Select the connection state selectively.

  Specifically, the switch SW2a is disposed between the connection line L2 and the high side power supply line Lta, and switches on / off of the connection state between the positive electrode of the unit battery E1 and the high side power supply line Lta. The switch SW3a is disposed between the connection line L3 and the high side power supply line Lta, and switches on / off of the connection state between the positive electrode of the unit battery E2 and the high side power supply line Lta. The switch SW1b is disposed between the connection line L1 and the low-side power supply line Ltb, and switches on / off the connection state between the negative electrode of the unit battery E1 and the low-side power supply line Lta. The switch SW2b is disposed between the connection line L2 and the low side power supply line Ltb, and switches on / off the connection state between the negative electrode of the unit battery E2 and the low side power supply line Lta.

  The switch unit 13 controls the on / off switching of the switches SW1a, SW2a, SW3a, SW1b, SW2b, and SW3b separately by a control signal from the control unit 11.

  The high side power supply line Lta according to the present embodiment is connected to the positive power supply terminal Ca of the voltage detection unit 12, and the low side power supply line Ltb is connected to the negative power supply terminal Cb of the voltage detection unit 12. The high side power supply line Lta and the low side power supply line Ltb are also connected to a power supply terminal (not shown) of the control unit 11 as a control power supply for the control unit 11.

  A capacitor Cc is connected in parallel with the unit battery E between the high-side power supply line Lta and the low-side power supply line Ltb. The capacitor Cc prevents a momentary power supply interruption to the voltage detection unit 12 and the like when the switches SW1a, SW2a, SW3a, SW1b, SW2b, and SW3b of the switch unit 13 are switched.

  The control unit 11 outputs a control signal to the voltage detection unit 12 to cause the voltage detection unit 12 to perform an operation of detecting the voltage between the terminals of each unit battery E. The control unit 11 outputs a control signal to the switch unit 13 to selectively operate the switches SW1a, SW2a, SW3a, SW1b, SW2b, and SW3b of the switch unit 13.

  The control unit 11 is configured by, for example, a microcomputer, and operates when the CPU refers to a control program or various data stored in a ROM, a RAM, or the like. However, part or all of these configurations may be realized by a dedicated hardware configuration.

  FIG. 2 is a diagram illustrating a supply path for supplying operating power from the unit battery E to the voltage detection unit 12.

  FIG. 2 shows a state where the unit battery E1 is used as a control power source as an example. In FIG. 2, in order to supply power from the unit battery E1 to the voltage detector 12, the switch SW2a and the switch SW1b are turned on. As a result, the positive electrode of the unit battery E1 is connected to the high-side power supply line Lta, and the negative electrode of the unit battery E1 is connected to the low-side power supply line Ltb.

  As a result, the unit battery E1 is discharged according to the load of the voltage detection unit 12, as indicated by the thick arrow in FIG.

  Conventionally, in an assembled battery, in order to prevent a specific unit battery from being overcharged, discharging is performed separately from each of the plurality of unit batteries so that the voltage between the terminals of each of the plurality of unit batteries is equal. Processing (also referred to as “equalization processing”) is performed (see, for example, Patent Document 1). For example, the equalization processing according to the prior art of Patent Document 1 is a target unit by individually controlling on / off of equalization switches arranged in parallel with respect to the positive electrode and the negative electrode of each unit battery. The positive electrode and the negative electrode of the battery are directly connected, and discharging is performed from the positive electrode of the unit battery toward the negative electrode.

  In the prior art, most of the power discharged from each unit battery during such equalization processing has been a power loss. The inventors of the present application have intensively studied from the viewpoint of effective use of energy and simplification of the wiring configuration, and have arrived at the circuit configuration of the present invention that uses the power discharged from each unit battery E as a control power source.

[Operation of monitoring device]
Hereinafter, the operation of the monitoring apparatus 10 according to the present embodiment will be described with reference to FIGS.

  FIG. 3 is a flowchart showing an example of the operation of the monitoring apparatus 10 according to the present embodiment. Note that the flowchart shown in FIG. 3 is processing executed by the control unit 11 in accordance with a computer program, for example.

  In step S <b> 1, the control unit 11 first causes the voltage detection unit 12 to detect the voltage between terminals of each unit battery E.

  In step S <b> 2, the control unit 11 acquires information related to the inter-terminal voltage of each unit battery E from the voltage detection unit 12, and sorts the plurality of unit cells E in descending order of the inter-terminal voltage.

  In step S <b> 3, the control unit 11 determines whether or not to change from the unit battery E currently set for the control power source (hereinafter referred to as “connected unit battery E”) to another unit battery E. To do. At this time, for example, when the inter-terminal voltage of the other unit battery E becomes higher than the inter-terminal voltage of the unit battery E being connected, the control unit 11 selects the unit battery for the control power source as the other unit battery. It is determined to change to E (step S3: YES), and the process proceeds to the subsequent step S4. On the other hand, for example, when the inter-terminal voltage of the connected unit battery E is the highest voltage, the control unit 11 determines not to change the unit battery for the control power supply (step S3: NO), and particularly performs processing. Without executing, the process returns to step S1 again to continue the monitoring process.

  In step S4, the control unit 11 disconnects the connection state between the positive and negative electrodes of the unit battery E being connected and the high-side power line Lta and the low-side power line Ltb. A switch (such as SW1a, SW2a, SW3a, SW1b, SW2b, or SW3b) that connects the negative electrode to the high-side power supply line Lta and the low-side power supply line Ltb is turned off. Further, the control unit 11 conducts the connection state between the positive and negative electrodes of the other unit battery E to be changed and the high-side power line Lta and the low-side power line Ltb. The switches (SW1a, SW2a, SW3a, SW1b, SW2b, SW3b, etc.) that connect the positive and negative electrodes of E to the high-side power supply line Lta and the low-side power supply line Ltb are turned on.

  FIG. 4 is a diagram for explaining equalization of the inter-terminal voltage of the unit battery E in the monitoring device 10 according to the present embodiment.

  The upper diagram of FIG. 4 shows the charging rate (SOC: State Of Charge) of each unit battery E before executing the equalization process, and the lower diagram of FIG. 4 shows each unit battery E after the equalization process is executed. Represents the charging rate. Note that the unit battery E1, the unit battery E2, the unit battery E3, the unit battery E4, and the unit battery E5 in FIG. 4 are different unit batteries E that constitute the assembled battery 20 (unit batteries E3, E4, and E5). (Not shown in FIG. 1).

  According to the monitoring apparatus 10 according to the present embodiment, as shown in the flowchart of FIG. 3, the unit batteries E used as the control power supply are sequentially changed from the one having the higher terminal voltage. Therefore, after a certain amount of time has elapsed, the state shown in the upper diagram of FIG. 4 shifts to the state shown in the lower diagram of FIG. 4, and the charging rate and terminal voltage of each unit battery E are equalized.

  In addition, the monitoring device 10 according to the present embodiment secures its own control power source by using the power discharged from each unit battery E for the equalization process of the assembled battery 20. Accordingly, it is possible to realize effective use of energy, simplification of the wiring configuration in the power storage device 100, and space saving.

(Modification 1 of the first embodiment)
FIG. 5 is a flowchart illustrating an example of the operation of the monitoring device 10 according to the first modification of the first embodiment.

  The flowchart shown in FIG. 5 differs from the flowchart shown in FIG. 3 only in that the process of step Sa is added between step S2 and step S3. In addition, description is abbreviate | omitted about the structure which is common in the said embodiment (Hereafter, it is the same also about other embodiment).

  In step Sa, the control unit 11 determines the number of connected unit batteries E used as a control power source. And the control part 11 determines the unit battery E used for control power supply in step S3 so that it may become the number of connections determined in step Sa.

  In this step Sa, when the voltage between the terminals of the connected unit battery E is sufficiently high, that is, when the charging rate is sufficiently high, the control unit 11 sets the number of connection of the unit batteries E to one, for example. On the other hand, when the voltage between the terminals of the unit battery E being connected is low, the control unit 11 sets the number of connection of the unit batteries E to a plurality (for example, two), for example.

  As described above, according to the monitoring device 10 according to the first modification, when the charging rate of the unit battery E decreases, the plurality of unit batteries E are connected to the high-side power supply line Lta and the low-side power supply line Ltb. This suppresses a state in which the operation of the monitoring device 10 becomes unstable (for example, an IC malfunction due to voltage fluctuation of the control power supply) due to insufficient supply capacity of the connected unit battery E serving as the control power supply. can do.

(Modification 2 of the first embodiment)
FIG. 6 is a flowchart illustrating an example of the operation of the monitoring device 10 according to the second modification of the first embodiment.

  The flowchart shown in FIG. 6 differs from the flowchart shown in FIG. 3 only in that the processes of steps Sb1 and Sb2 are added before step S1.

  In step Sb1, the control unit 11 determines the execution frequency of the voltage detection operation in the voltage detection unit 12 based on the inter-terminal voltages of the plurality of unit batteries E. For example, when the difference between the inter-terminal voltage of the unit battery E being connected and the inter-terminal voltage of the second highest unit battery E is greater than or equal to a threshold value, the control unit 11 may Since it can be determined that there is no need to switch from E, the frequency of the voltage detection operation is reduced.

  The method for changing the execution frequency of the voltage detection operation may be any method. In the second modification, for example, the waiting time (for example, zero seconds to one minute) set in step Sb2 is changed. To change the execution frequency.

  In step Sb2, the control unit 11 determines whether it is the execution timing of the voltage detection operation according to the waiting time set in step Sb1. The controller 11 waits without performing any particular processing until the waiting time elapses (step Sb2: NO). And the control part 11 advances a process to step S1 as waiting time passes (step Sb2: YES).

  As described above, according to the monitoring device 10 according to the modification 2, the frequency at which the voltage detection unit 12 performs the detection operation can be reduced according to the inter-terminal voltages of the plurality of unit batteries E. Thereby, the power consumption in the voltage detection part 12 can be suppressed, and energy can be utilized more effectively.

(Modification 3 of the first embodiment)
FIG. 7 is a diagram illustrating an example of a circuit configuration of the monitoring apparatus 10 according to the third modification of the first embodiment.

  In FIG. 7, each of the connection lines L1 to L3 has a configuration in which one end side is connected to the connection terminals P1 to P3 and the other end side is bifurcated. More specifically, the connection lines L1 to L3 include first branch lines LDa1, LDa2, and LDa3, and second branch lines LDb1, LDb2, and LDb3. The first branch lines LDa1, LDa2, and LDa3 allow a discharge current from the target unit battery E to flow during the equalization process. Further, the second branch lines LDb1, LDb2, and LDb3 define the potential of the positive electrode of the target unit battery E when detecting the voltage.

  The voltage detection unit 12 according to the third modification detects the voltage between the terminals of the unit battery E1 based on the potential difference between the second branch line LDb2 and the first branch line LDa1, and the second branch line LDb3 and the first branch line LDb3. The inter-terminal voltage of the unit battery E2 is detected based on the potential difference of the branch line LDa2.

  The resistors Rf2 to Rf3 and Cf1 to Cf2 constitute an RC circuit and function as a filter that removes noise at the time of voltage detection.

  As described above, according to the monitoring device 10 according to the modified example 3, the line (in this case, the first branch lines LDa1, LDa2, and LDa3) through which the discharge current flows from the unit battery E during the equalization process, A line (here, the second branch lines LDb1, LDb2, and LDb3) that defines the potential of the positive electrode of the unit battery E at the time of voltage detection is separately provided.

  As a result, the monitoring device 10 according to the modification 3 can perform voltage detection with high accuracy even when detecting the voltage between the terminals of the unit battery E being connected.

(Second Embodiment)
Hereinafter, an example of the configuration of the monitoring apparatus 10 according to the present embodiment will be described with reference to FIG. The monitoring device 10 of the power storage device 100 according to the present embodiment is different from the first embodiment in that it includes a communication unit 15 that performs PLC (Power Line Communication) communication with an external device.

  FIG. 8 is a diagram illustrating an example of the configuration of the in-vehicle power supply device A including the monitoring device 10 according to the second embodiment.

  The in-vehicle power supply device A according to the present embodiment includes an inverter device 200, a charging device 300, and a junction box 400 in addition to the power storage device 100 described above. And the electrical storage apparatus 100 is connected with the inverter apparatus 200, the charging device 300, and the junction box 400 by the electric power line LM connected to the output terminal of the assembled battery 20.

  The inverter device 200 includes an inverter circuit 201, a control unit 202 that controls the inverter circuit 201, and a communication unit 203 that transmits and receives signals to and from the power storage device 100 and the like. In addition, the charging device 300 includes a charging circuit 301, a control unit 302 that controls the charging circuit 301, and a communication unit 303 that transmits and receives signals to and from the power storage device 100 and the like. The junction box 400 also transmits / receives signals to / from the switch circuit 401 (switches are omitted in FIG. 8) that switches the power line LM, the control unit 402 that controls the switch circuit 401, the power storage device 100, and the like. A communication unit 403 is provided.

  The communication unit 15 of the monitoring device 10 according to the present embodiment uses the power line LM as a communication line, and represents a communication unit 203 of an external device (representing the inverter device 200, the charging device 300, and the junction box 400; the same applies hereinafter), PLC communication is performed with 303 and 403.

  The communication units 15, 203, 303, and 403 use a DA converter, a photocoupler, and the like, for example, superimpose a signal component on the power flowing through the power line LM, and transmit a signal to an external device. In addition, the communication units 15, 203, 303, and 403 use, for example, an AD converter and a photocoupler to acquire a signal component superimposed on the power flowing through the power line and receive a signal from an external device. . Note that the configurations of the communication units 15, 203, 303, and 403 for performing PLC communication are the same as known configurations, and thus detailed description thereof is omitted here.

  Information that the communication units 15, 203, 303, and 403 according to the present embodiment communicate with the external device includes, for example, information on the charging rate of the assembled battery 20 and execution information related to charging / discharging of the assembled battery 20 (for example, charging start) Command).

  The control unit 11 of the power storage device 100 according to the present embodiment operates in cooperation with the external device by transmitting and receiving signals to and from the control units 202, 302, and 402 of the external device via the communication units 15, 203, 303, and 403. It becomes possible.

  As described above, according to the monitoring device 10 of the assembled battery 20 according to the present embodiment, it is possible to omit a communication line drawn out from the power storage device 100 by using PLC communication.

  Thus, the monitoring apparatus 10 according to the present embodiment uses the power line LM as a communication line while securing its own control power source using the power discharged from each unit battery E of the assembled battery 20. Communicate with external devices.

  Accordingly, the power line LM is the only line required for the power storage device 100 to connect to an external device, so that the power storage device 100 can be easily diverted and reused for another vehicle or other than the vehicle. That is, further simplification and space saving of the wiring configuration of the power storage device 100 can be realized.

(Other embodiments)
The present invention is not limited to the above embodiment, and various modifications can be considered.

  In the said embodiment, the aspect of the monitoring apparatus 10 of the assembled battery 20 was shown variously. However, it is needless to say that various combinations of the modes shown in the embodiments may be used.

  In the above embodiment, as an example of the configuration of the control unit 11, the function of the control unit 11 is described as being realized by one computer. However, a part or all of each function is distributed to a plurality of computers. Of course, it may be realized.

  In the above embodiment, as an example of the operation of the control unit 11, the operation of detecting the voltage between the terminals of the unit battery E and the operation of switching the switch unit 13 are shown as being executed in a series of flows. Of course, some or all of these processes may be executed in parallel.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  According to the assembled battery monitoring device of the present disclosure, the wiring configuration in the power storage device can be simplified and the space can be saved.

DESCRIPTION OF SYMBOLS 10 Monitoring apparatus 11 Control part 12 Voltage detection part 13 Switch part 15 Communication part 20 Battery assembly 100 Power storage device A Car-mounted power supply device E1-E5 Unit battery L1-L3 Connection line LDa1-LDa3 1st branch line LDb1-LDb3 2nd Branch line Lta High side power supply line Ltb Low side power supply line LM Power line P1 to P3 Connection terminal Ca, Cb Power supply terminal Cc Capacitor SW1a, SW1b, SW2a, SW2b, SW3a, SW3b Switch

Claims (8)

An assembled battery monitoring device configured by connecting a plurality of unit cells in series,
A plurality of connection lines connected to the positive and negative electrodes of each of the plurality of unit cells;
A high-side power line and a low-side power line that transmit operating power of the monitoring device;
A voltage detection unit that detects a voltage between terminals of each of the plurality of unit batteries via the plurality of connection lines;
A switch unit capable of individually switching a connection state between each of the plurality of connection lines and each of the high-side power supply line and the low-side power supply line;
Based on the inter-terminal voltage of each of the plurality of unit cells, the positive electrode of at least one unit cell is connected to the high-side power line, and the negative electrode of the one unit cell is connected to each of the low-side power lines. And a control unit for controlling the switch unit,
A battery pack monitoring device comprising: The control unit determines, among the plurality of unit batteries, a first unit battery having a higher inter-terminal voltage than the other unit batteries as a target to be connected to the high-side power line and the low-side power line.
The assembled battery monitoring apparatus according to claim 1. The control unit selects a target to be connected to the high-side power line and the low-side power line in response to a voltage between terminals of the first unit battery being lower than a voltage between terminals of the second unit battery. Changing from the first unit cell to the second unit cell;
The assembled battery monitoring device according to claim 2. The control unit determines the number of unit cells to be connected to the high-side power line and the low-side power line based on the inter-terminal voltage of each of the plurality of unit batteries.
The assembled battery monitoring apparatus according to claim 1. The control unit changes the frequency of causing the voltage detection unit to perform a detection operation based on the inter-terminal voltage of each of the plurality of unit batteries.
The assembled battery monitoring apparatus according to claim 1. A capacitor having one end and the other end connected to the high-side power line and the low-side power line, respectively.
The assembled battery monitoring apparatus according to claim 1. A communication unit that performs PLC communication with an external device using a power line connected to the output terminal of the assembled battery;
The assembled battery monitoring apparatus according to claim 1. A vehicle-mounted power supply device comprising the assembled battery monitoring device according to any one of claims 1 to 7.

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