JP5696610B2 - Battery monitoring device - Google Patents

Description

  The present invention relates to a battery monitoring apparatus that monitors an assembled battery in which a plurality of battery cells are connected in series.

  2. Description of the Related Art Conventionally, a battery monitoring device has, as main components, a monitoring circuit (monitoring means) for monitoring a battery state (for example, voltage fluctuation of a battery cell) of an assembled battery, and a microcomputer (hereinafter referred to as a control means for controlling the monitoring circuit) Are abbreviated as microcomputers).

  The monitoring circuit in the battery monitoring device is configured to be driven by being supplied with power from the assembled battery to be monitored, and the control means is driven by being supplied with power from an auxiliary battery that is different from the assembled battery. Is configured to do. That is, the monitoring circuit constitutes a high voltage system driven at a high voltage, whereas the control means constitutes a low voltage system driven at a low voltage.

  In such a battery monitoring device, in order to protect the control means that is a low-voltage system, an insulation that enables transmission of a signal from the control means to the monitoring circuit in a state where the monitoring circuit and the control means are electrically insulated. A configuration of connecting via a signal transmission means (insulating element) is adopted (for example, see Patent Document 1). In general, as the insulation signal transmission means, a photocoupler constituted by a phototransistor or the like that does not require power supply to its constituent elements is employed on the monitoring circuit side.

JP 2007-232417 A

  By the way, in the battery monitoring device, it is desired to detect overcharge and overdischarge accurately and at high speed in order to protect the battery cells of the assembled battery from the progress of rapid deterioration in the overdischarge state and failure due to the overcharge state. It is rare.

  Therefore, the present inventors have a high-speed signal transmission unit (for example, a high-speed logic IC) as an insulation signal transmission unit that uses an assembled battery as a power source and speeds up signal transmission from the control unit side to the monitoring unit side. Etc.) is being considered.

  However, in general, a system using an assembled battery is provided with a dark current mode for cutting off power supply from the assembled battery to various electric devices including the battery monitoring device in order to suppress power consumption in the assembled battery. In the current mode, power supply to the high-speed signal transmission unit is interrupted, and signal transmission between the monitoring unit and the control unit becomes impossible. As in the prior art, when a photocoupler is used as the insulation signal transmission means, the signal transmission speed is low, but the signal transmission is performed between the monitoring means and the control means even if no power is supplied from the assembled battery. Can be done.

  On the other hand, in order to activate the high-speed signal transmission unit of the insulation signal transmission means in the dark current mode, a means (for example, a photocoupler) that enables signal transmission with the monitoring means and the control means insulated. However, there is a problem in that the cost of the battery monitoring device is increased.

  In addition, it is conceivable to separately provide a means for supplying power to the high-speed signal transmission unit in the dark current mode on the control means side which is a low voltage system. However, in this case as well, there is a problem that the cost of the battery monitoring device is increased. is there.

  In view of the above points, the present invention provides a means for enabling signal transmission in a state where the monitoring means and the control means are insulated, and a means for supplying power to the high-speed signal transmission unit in the dark current mode, It is an object of the present invention to provide a battery monitoring device capable of starting a high-speed signal transmission unit of an insulation signal transmission means.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a battery monitoring device for monitoring an assembled battery (1) configured by connecting a plurality of battery cells (10) in series, the assembled battery (1 ) Monitoring means (3) driven by power supply from the battery pack (1), monitoring means (3), monitoring means (3), and control means (4) for controlling the operation of the monitoring means (3). Insulating signal transmission means (5) for transmitting a signal from the control means (4) side to the monitoring means (3) side in an electrically insulated state. The insulation signal transmission means (5) 4) A high-speed signal transmission unit (52b) is provided for speeding up signal transmission from the primary side element (51) provided on the side to the secondary side element (52) provided on the monitoring means (3) side. The high-speed signal transmission unit (52b) is driven by power supply from the assembled battery (1). The dark current mode in which the monitoring means (3) and the insulation signal transmission means (5) are configured to cut off power supply from the assembled battery (1) to the monitoring means (3) and the high-speed signal transmission unit (52b), respectively. Sometimes, a power generation means (6) is provided for generating power for activating the high-speed signal transmission unit (52b) based on a signal transmitted from the primary side element (51) to the secondary side element (52). It is characterized by being.

  According to this, the electric power for starting a high-speed signal transmission part (52b) is produced | generated based on the signal transmitted to the secondary side element (52) of the insulation signal transmission means (5) at the time of dark current mode. Therefore, there is no need to separately provide a means for transmitting a signal in an insulated state between the monitoring means (3) and the control means (4) and a means for supplying power to the high-speed signal transmission section (52b) in the dark current mode. The high-speed signal transmission unit (52b) can be activated.

Further, in the invention according to claim 1, the monitoring means (3), the power interrupting means for interrupting the power supply from the assembled battery (1) to the dark current mode high speed signal transmission unit to the (52 b) (33) The power generation means (6) is a power storage means (34) for accumulating as a charge a signal transmitted from the primary side element (51) to the secondary side element (52) of the insulation signal transmission means (5). The power storage means (34) supplies power to the power shut-off means (33) when the accumulated charge amount exceeds a predetermined value, and from the assembled battery (1) to the high-speed signal transmission unit (52b). It is comprised so that interruption | blocking of the electric power supply to may be cancelled | released.

  In this way, the signal transmitted from the primary side element (51) to the secondary side element (52) of the insulation signal transmission means (5) is accumulated as electric charges, and the assembled battery ( The high-speed signal transmission unit (52b) can be activated by releasing the interruption of the power supply from 1) to the high-speed signal transmission unit (52b).

Further, in the invention according to claim 2, power generating means (6), as a charge signal transferred from the primary side element (51) on the secondary side element (52) of insulating the signal transmission means (5) It has a power storage means (34) for storing, and the power storage means (34) is configured to supply power to the high-speed signal transmission unit (52b) when the amount of stored charge exceeds a predetermined value. It is characterized by.

  In this way, the signal transmitted from the control means (4) to the secondary side element (52) is accumulated as electric charges, and power is supplied to the high-speed signal transmission unit (52b) using the accumulated electric charges. Thus, the high-speed signal transmission unit (52b) can be activated.

  By the way, if charge accumulation by the power storage means (34) continues even after the start of the high-speed signal transmission unit (52b), signal transmission from the control means (4) to the monitoring means (3) is hindered. There is a fear.

Therefore, in the invention according to claim 1, power generating means (6), after the activation of the high-speed signal transmission unit (52 b) is completed, the charge stopping the accumulation of charge in the power storage means (34) storing It has a stop means (54), It is characterized by the above-mentioned.

  According to this, since the charge accumulation by the power storage means (34) is stopped after the start of the high-speed signal transmission unit (52b) is completed, the charge accumulation by the power storage means (34) is monitored from the control means (4). It can be suppressed that the signal transmission to the means (3) is hindered.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

1 is an overall configuration diagram of an assembled battery control system including a battery monitoring device according to a first embodiment. It is a block diagram which shows the detail of the battery monitoring apparatus which concerns on 1st Embodiment. It is a block diagram which shows the detail of the battery monitoring apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the modification of the battery monitoring apparatus which concerns on 1st Embodiment. It is a block diagram which shows the modification of the battery monitoring apparatus which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an overall configuration of an assembled battery control system including a battery monitoring device according to the present embodiment.

  In the present embodiment, the battery monitoring device 2 of the present invention is applied to the control system for the assembled battery 1 which is an in-vehicle high voltage battery. As shown in FIG. 1, the assembled battery control system of the present embodiment includes an assembled battery 1 and a battery monitoring device 2 as main components.

  The assembled battery 1 of this embodiment supplies electric power to various electric devices such as an electric motor (not shown) for driving a vehicle. Specifically, the assembled battery 1 is formed by connecting a plurality of battery cells 10 made of lithium ion batteries or the like in series, and connecting a plurality of unit batteries Bi grouped for each predetermined number of battery cells 10 adjacent to each other. It is structured as a body. In FIG. 1, one unit battery Bi is shown, but actually, a plurality of unit batteries Bi are provided, and the assembled battery 1 is configured by connecting a plurality of unit batteries Bi in series. Yes.

  A battery monitoring device 2 is connected to the assembled battery 1 configured as described above via a detection line. This battery monitoring device 2 is a device having an overcharge / discharge detection function for monitoring the battery state (overdischarge state, overcharge state, etc.) of each battery cell 10 constituting the assembled battery 1. The overdischarge state means an abnormal state in which the voltage at both ends of each battery cell 10 becomes an excessively low voltage that causes a decrease in reliability. In the overcharge state, the voltage at both ends of each battery cell 10 is reliable. It means an abnormal state that results in an excessively high voltage that causes a decrease in.

  Specifically, the battery monitoring device 2 includes, as main components, a monitoring circuit 3 as a monitoring unit that monitors the state of each battery cell 10, a microcomputer 4 as a control unit that controls the operation of the monitoring circuit 3, and the like, and An insulating element 5 is provided that enables signal transmission in a state where the monitoring circuit 3 and the microcomputer 4 are electrically insulated.

  The monitoring circuit 3 uses a high-voltage assembled battery 1 as a power source, and the microcomputer 4 uses a low-voltage auxiliary battery (not shown) (for example, a 12V battery) as a power source. That is, the monitoring circuit 3 of the present embodiment constitutes a high voltage system that is driven at a high voltage, whereas the microcomputer 4 that is a control means constitutes a low voltage system that is driven at a low voltage.

  The monitoring circuit 3 is connected to both electrode terminals of the plurality of battery cells 10 through detection lines, and is configured to detect the voltage at both ends of each connected battery cell 10 and output the result to the microcomputer 4 side. Yes. Note that the monitoring circuit 3 of the present embodiment is provided for each unit battery Bi.

  The monitoring circuit 3 includes a voltage detection unit 31 that detects voltages across the battery cells 10, a power supply unit 32 that converts a voltage from the assembled battery 1 into a driving voltage for the monitoring circuit 3, and various control devices from the assembled battery 1. A switch circuit 33 that can cut off the power supply to is provided.

  The voltage detection unit 31 of the present embodiment has a plurality of selection switches connected to the battery cell 10 to be monitored, and is obtained via a multiplexer (not shown) configured to be able to turn on / off an arbitrary selection switch via the multiplexer. An AD converter (not shown) that converts an analog signal (voltage value) into a digital signal and transmits it to the microcomputer 4 side is formed.

  The power supply unit 32 of the present embodiment is connected to the positive terminal of the battery cell 10 having the highest voltage in the unit battery Bi and the negative terminal of the battery cell 10 having the lowest voltage, and the voltage of the unit battery Bi is desired. (The driving voltage of the monitoring circuit 3).

  The switch circuit 33 according to the present embodiment switches between a connection state (ON) in which the unit battery Bi and the power supply unit 32 are connected and a cut-off state (OFF) in which the battery pack 1 and the power supply unit 32 are disconnected. Is.

  Specifically, the switch circuit 33 is connected between the positive terminal of the battery cell 10 having the highest voltage in the unit battery Bi and the power supply unit 32, and the positive terminal of the battery cell 10 having the highest voltage. The connection with the power supply unit 32 is turned on and off. The switch circuit 33 constitutes a means for shutting off the power supply from the unit battery Bi to the monitoring circuit 3, and constitutes a power shut-off means for shutting off the power supply to the high-speed signal transmission unit 52b of the insulating element 5 described later. To do.

  In addition, the switch circuit 33 of the present embodiment connects the assembled battery 1 (unit battery Bi) and the power supply unit 32 by applying a predetermined voltage, and the assembled battery 1 (unit battery Bi) when not energized. ) And the power supply unit 32 is configured as a normally open switch. The switch circuit 33 is configured to be driven by a voltage applied in accordance with an instruction signal or the like from the microcomputer 4 side.

  The microcomputer 4 is a microcomputer including an MPU, a ROM, an EEPROM, a RAM, an input / output unit (not shown), and the like, and executes various processes according to a program stored in a storage unit in the ROM or the like.

  For example, the microcomputer 4 of the present embodiment reduces the power consumption of the assembled battery 1 in the dark current mode in which power supply from the assembled battery 1 to various electric devices such as a motor for driving the vehicle is interrupted when the vehicle is stopped. In order to suppress it, the power supply from the assembled battery 1 to the high-speed signal transmission unit 52b of the monitoring circuit 3 and the insulating element 5 is cut off. For example, in the dark current mode, an instruction signal for turning off the switch circuit 33 is transmitted from the microcomputer 4 side to the monitoring circuit 3 side.

  The insulating element 5 is an insulating signal transmission that enables signal transmission between the microcomputer 4 and the monitoring circuit 3 in a state where the monitoring circuit 3 driven at a high voltage and the microcomputer 4 driven at a low voltage are electrically insulated. Configure the means. The insulating element 5 of this embodiment is configured to transmit a signal from the microcomputer 4 side (control means side) to the monitoring circuit 3 side (monitoring means side). Although not shown, the battery monitoring device 2 is also provided with an insulating element for transmitting a signal from the monitoring circuit 3 side to the microcomputer 4 side.

  Here, the detail of the insulating element 5 of this embodiment is demonstrated based on FIG. FIG. 2 is a configuration diagram showing details of the battery monitoring device 2 according to the present embodiment. In FIG. 2, illustration of the microcomputer 4 is omitted.

  The insulating element 5 of this embodiment includes a light emitting element 51a that constitutes a primary side element 51 provided on the microcomputer 4 side, a light receiving element 52a that constitutes a secondary side element 52 provided on the monitoring circuit 3 side, and a light receiving element 52a. Is connected to a connection point of the monitoring circuit 3 and includes a high-speed signal transmission unit 52b for speeding up signal transmission from the primary side element 51 to the secondary side element 52.

  As the insulating element 5, for example, a photo IC coupler in which the light emitting element 51 a is a light emitting diode, the light receiving element 52 a is a phototransistor, and the high speed signal transmission unit 52 b is a high speed logic IC can be employed.

  The high-speed signal transmission unit 52b of the insulating element 5 according to the present embodiment is configured to be driven by power supply from the assembled battery 1, and the positive-side power terminal is connected to the monitoring circuit 3 via the positive-side power line L1. The negative power supply terminal is connected to the power supply unit 32 of the monitoring circuit 3 via the negative power supply line L2. Note that, similarly to the monitoring circuit 3, the high-speed signal transmission unit 52b is configured to cut off the power supply from the assembled battery 1 when the switch circuit 33 is turned off in the dark current mode.

  In addition, the monitoring circuit 3 and the insulating element 5 of the battery monitoring device 2 of the present embodiment include the primary side element 51 to the secondary side element 52 in the insulating element 5 in the dark current mode in which the power supply from the assembled battery 1 is cut off. A power generation unit (power generation unit) 6 that generates power for starting up the high-speed signal transmission unit 52b based on the signal transmitted to is provided.

  The power generation unit 6 of this embodiment generates power for starting up the high-speed signal transmission unit 52b by using an electromotive force (photoelectric effect) generated in the light receiving element 52a by light emission of the light emitting element 51a of the insulating element 5. It is configured as follows.

  Specifically, the power generation unit 6 of the present embodiment is transmitted from the primary side element 51 in the insulating element 5 to the secondary side element 52 and the high resistance 53 having a relatively high resistance value (for example, 1 MΩ or more). The power storage unit 34 is configured to store the received signals as electric charges.

  The high resistance 53 is disposed so as to connect between a connection point between the light receiving element 52 a of the insulating element 5 and the high-speed signal transmission unit 52 b and the switch circuit 33 of the monitoring circuit 3. The high resistance 53 connects the light receiving element 52a of the insulating element 5 and the switch circuit 33 without going through the high-speed signal transmission unit 52b.

The power storage unit 34 is a power storage unit that accumulates a current (charge) that flows from the light receiving element 52a through the high resistance 53 to the switch circuit 33 side when the light emitting element 51a of the insulating element 5 emits light. In other words, the power storage unit 34 accumulates charges generated due to the signal transmitted from the primary side element 51 to the secondary side element 52.

The power storage unit 34 is arranged to connect between a connection point between the high resistance 53 and the switch circuit 33 and a connection point between the high-speed signal transmission unit 52b and the power supply unit 32 in the negative power supply line L2. . Note that the power storage unit 34 of the present embodiment includes a capacitor.

  The above is the overall configuration of the battery monitoring apparatus 2 according to the present embodiment, and the outline of the operation of the battery monitoring apparatus 2 according to the present embodiment will be described below.

  First, monitoring of the assembled battery 1 by the battery monitoring device 2 will be described. The monitoring of the assembled battery 1 by the battery monitoring device 2 is performed, for example, in the situation where power is supplied from the assembled battery 1 to the monitoring circuit 3 and the high-speed signal transmission unit 52 b of the insulating element 5. Executed.

  The microcomputer 4 transmits (outputs) a monitoring instruction signal for instructing monitoring of the battery state (voltage state) of each battery cell 10 to the monitoring circuit 3 via the insulating element 5. In the monitoring circuit 3 that has received the monitoring instruction signal from the microcomputer 4, the voltage detection unit 31 detects the voltage of each battery cell 10 of the unit battery Bi that is to be monitored. Thereafter, the monitoring circuit 3 transmits the voltage of each battery cell 10 detected by the voltage detection unit 31 to the microcomputer 4, and the microcomputer 4 uses the battery state (for example, overdischarge state or overcharge state) of each battery cell 10. Is diagnosed.

  Next, an operation when starting the battery monitoring device 2 in the dark current mode in which the power supply from the assembled battery 1 to various electric devices such as the battery monitoring device 2 is interrupted will be described.

  In the microcomputer 4, an activation instruction signal for instructing activation is transmitted to the monitoring circuit 3 through the insulating element 5. The microcomputer 4 transmits a start instruction signal in which a duty ratio (for example, 100%) higher than that of a normal signal such as a monitor instruction signal is set for a predetermined time (for example, about 1 second).

In response to the activation instruction signal from the microcomputer 4, the light emitting element 51a that is the primary element 51 of the insulating element 5 emits light, and the light receiving element 52a that is the secondary element 52 of the insulating element 5 due to the photoelectric effect of the light emitting element 51a. Current (charge) flows to the switch circuit 33 side through the high resistance 53, and the charge is accumulated in the power storage unit 34.

Thereafter, the amount of charge stored in the power storage unit 34 exceeds a predetermined charge amount, a predetermined voltage is applied to the switch circuit 33, the switch circuit 33 is turned on. That is, the interruption of power supply from the unit battery Bi to the monitoring circuit 3 and the high-speed signal transmission unit 52b of the insulating element 5 by the switch circuit 33 is released. Thereby, electric power is supplied from the unit battery Bi to the high-speed signal transmission unit 52b of the monitoring circuit 3 and the insulating element 5, and the high-speed signal transmission unit 52b of the monitoring circuit 3 and the insulating element 5 is activated.

  In the battery monitoring device 2 of the present embodiment described above, the power for starting the high-speed signal transmission unit 52b is generated based on the signal transmitted to the secondary side element 52 of the insulating element 5 in the dark current mode. Therefore, the monitoring circuit 3 and the insulating element can be provided without separately providing a means for transmitting a signal while the monitoring circuit 3 and the microcomputer 4 are insulated and a means for supplying power to the high-speed signal transmission unit 52b in the dark current mode. 5 high-speed signal transmission unit 52b can be activated.

  In particular, in the battery monitoring device 2 of the present embodiment, in the dark current mode, the signal transmitted from the primary side element 51 to the secondary side element 52 of the insulating element 5 is accumulated as a charge, and the accumulated charge is used. Then, the monitoring circuit 3 and the high-speed signal transmission unit 52b can be activated by releasing the interruption of the power supply from the unit battery Bi to the monitoring circuit 3 and the high-speed signal transmission unit 52b of the insulating element 5.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram showing details of the battery monitoring device 2 according to the present embodiment. In addition, illustration of the microcomputer 4 is abbreviate | omitted in FIG.

  In the first embodiment described above, the high-speed signal transmission unit 52b is indirectly activated by turning on the switch circuit 33 by the electric charge stored in the power storage unit 34 of the power generation unit 6. On the other hand, the present embodiment is different from the first embodiment in that the high-speed signal transmission unit 52b is directly activated using the electric charge stored in the power storage unit 34 of the power generation unit 6. ing. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  Specifically, as shown in FIG. 3, the high resistance 53 in the power generation unit 6 of the present embodiment includes a connection point between the light receiving element 52a of the insulating element 5 and the high-speed signal transmission unit 52b, and the positive-side power line L1. The high-speed signal transmission unit 52b and the connection point of the switch circuit 33 are connected to each other.

  The positive power line L1 prohibits the flow of current from the high-speed signal transmission unit 52b side to the switch circuit 33 side, and allows only the current flow from the switch circuit 33 side to the high-speed signal transmission unit 52b side. A diode 35 is provided. In addition, the connection line connecting the positive power supply line L1 and the high resistance 53 prohibits the flow of current from the positive power supply line L1 side to the high resistance 53 side, and the positive power supply line L1 from the high resistance 53 side. A diode 36 is provided which allows only current flow to the side.

  In addition, the power storage unit 34 of the present embodiment connects the connection point between the high resistance 53 and the diode 36 and the connection point between the power supply unit 32 and the high-speed signal transmission unit 52b in the negative power supply line L2. Has been placed.

  Next, an operation when starting the battery monitoring device 2 in the dark current mode in which the power supply from the assembled battery 1 to various electric devices such as the battery monitoring device 2 is interrupted will be described. First, the microcomputer 4 transmits a start instruction signal for instructing start of the monitoring circuit 3 to the monitoring circuit 3 via the insulating element 5 for a predetermined time.

  In response to the activation instruction signal from the microcomputer 4, the light emitting element 51a that is the primary element 51 of the insulating element 5 emits light, and the light receiving element 52a that is the secondary element 52 of the insulating element 5 due to the photoelectric effect of the light emitting element 51a. Through the high resistance 53, current flows to the high-speed signal transmission unit 52 b side, and charges are accumulated in the power storage unit 34.

Thereafter, when the amount of charge accumulated in the power storage unit 34 exceeds a predetermined amount of charge, a predetermined voltage is applied to the high-speed signal transmission unit 52b, and the high-speed signal transmission unit 52b is activated. As a result, signal transmission between the monitoring circuit 3 and the microcomputer 4 becomes possible, and the switch circuit 33 is turned on by transmitting an instruction signal for instructing the switch circuit 33 to be turned on from the microcomputer 4 side. When the switch circuit 33 is turned on, the interruption of the power supply from the unit battery Bi to the monitoring circuit 3 and the high-speed signal transmission unit 52b of the insulating element 5 by the switch circuit 33 is released, and the monitoring circuit 3 and the insulating element 5 from the unit battery Bi are released. When the power is supplied to the high-speed signal transmission unit 52b, the monitoring circuit 3 is activated.

  In the battery monitoring device 2 of the present embodiment described above, the power for starting the high-speed signal transmission unit 52b is generated based on the signal transmitted to the secondary side element 52 of the insulating element 5 in the dark current mode. Therefore, the monitoring circuit 3 and the insulating element can be provided without separately providing a means for transmitting a signal while the monitoring circuit 3 and the microcomputer 4 are insulated and a means for supplying power to the high-speed signal transmission unit 52b in the dark current mode. 5 high-speed signal transmission unit 52b can be activated.

  In particular, in the present embodiment, in the dark current mode, the signal transmitted from the primary side element 51 to the secondary side element 52 of the insulating element 5 is accumulated as electric charge, and the accumulated electric charge is used to insulate the insulating element. The high-speed signal transmission unit 52b can be activated by supplying power to the five high-speed signal transmission units 52b. Since the signal transmission between the monitoring circuit 3 and the microcomputer 4 can be performed by starting the high-speed signal transmission unit 52b, the switch circuit 33 of the monitoring circuit 3 is turned on by an instruction signal from the microcomputer 4. Thus, the monitoring circuit 3 can be activated.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, Unless it deviates from the range described in each claim, it is not limited to the wording of each claim, and those skilled in the art Improvements based on the knowledge that a person skilled in the art normally has can be added as appropriate to the extent that they can be easily replaced. For example, various modifications are possible as follows.

  (1) In each of the above-described embodiments, even after the start of the high-speed signal transmission unit 52b is completed, the signal received by the light receiving element 52a of the insulating element 5 passes through the high resistance 53 of the power generation unit 6 as a charge. Thus, the power storage unit 34 can be stored. However, in this case, the power generation unit 6 may interfere with signal transmission from the microcomputer 4 to the monitoring circuit 3.

  For this reason, as shown in FIGS. 4 and 5, the connection between the light receiving element 52a and the high-speed signal transmission unit 52b in order to stop the charge accumulation in the power storage unit 34 after the activation of the high-speed signal transmission unit 52b is completed. It is preferable that a charge accumulation stop unit (charge accumulation stop unit) 54 that cuts off the connection between the light receiving element 52 a and the high resistance 53 is provided between the point and the high resistance 53.

  According to this, since the charge accumulation by the power storage unit 34 is stopped after the start of the high-speed signal transmission unit 52b is completed, the charge accumulation by the power storage unit 34 hinders the signal transmission from the microcomputer 4 to the monitoring circuit 3. Can be suppressed. The charge accumulation stop unit 54 can be configured by a switch that cuts off the connection between the light receiving element 52a and the high resistance 53 in conjunction with the completion of activation of the high-speed signal transmission unit 52b, for example.

  FIG. 4 is a configuration diagram illustrating a modification of the insulating element 5 of the battery monitoring device 2 according to the first embodiment. FIG. 5 illustrates a modification of the insulating element 5 of the battery monitoring device 2 according to the second embodiment. It is a block diagram which shows an example.

  (2) In each of the above-described embodiments, the example in which the power storage unit 34 of the power generation unit 6 is configured by a capacitor has been described. Can do.

  (3) In each of the above-described embodiments, the example in which the insulating element 5 is configured by a photo IC coupler has been described. However, the present invention is not limited to this example. For example, an insulating element configured by capacitor coupling or transformer coupling is employed. May be.

  (4) In each of the above-described embodiments, the example in which the battery monitoring device 2 is applied to a vehicle-mounted high-voltage battery has been described in each of the above-described embodiments, but the present invention is not limited to the vehicle-mounted high-voltage battery and may be used for other batteries.

1 assembled battery 10 battery cell 3 monitoring circuit (monitoring means)
4 Microcomputer (control means)
5 Insulation element (insulation signal transmission means)
51 Primary side element 52 Secondary side element 52b High-speed signal transmission part 54 Charge accumulation stop part (charge accumulation stop means)
6 Power generation unit (power generation means)

Claims (2)

A battery monitoring device for monitoring an assembled battery (1) configured by connecting a plurality of battery cells (10) in series,
Monitoring means (3) driven by power supply from the assembled battery (1) and monitoring the battery state of the assembled battery (1);
A signal from the control means (4) side to the monitoring means (3) side in a state where the monitoring means (3) and the control means (4) for controlling the operation of the monitoring means (3) are electrically insulated. An insulation signal transmission means (5) for transmitting
The insulation signal transmission means (5) transmits a signal from a primary side element (51) provided on the control means (4) side to a secondary side element (52) provided on the monitoring means (3) side. A high-speed signal transmission unit (52b) for speeding up
The high-speed signal transmission unit (52b) is configured to be driven by power supply from the assembled battery (1),
The monitoring means (3) and the insulation signal transmission means (5) include dark currents that cut off power supply from the assembled battery (1) to the monitoring means (3) and the high-speed signal transmission unit (52b), respectively. Power generation means (6) for generating power for activating the high-speed signal transmission unit (52b) based on a signal transmitted from the primary side element (51) to the secondary side element (52) during the mode Is provided ,
The monitoring means (3) is provided with a power cut-off means (33) for cutting off power supply from the assembled battery (1) to the high-speed signal transmission unit (52b) in the dark current mode.
The power generation means (6) includes a power storage means (34) for accumulating as a charge a signal transmitted from the primary side element (51) to the secondary side element (52) of the insulation signal transmission means (5). Have
The power storage means (34) supplies power to the power cut-off means (33) when the accumulated charge amount exceeds a predetermined charge amount, so that the high-speed signal transmission unit ( 52b) is configured to release the interruption of the power supply to
The power generation means (6) has charge accumulation stop means (54) for stopping accumulation of charges in the power storage means (34) after the start of the high-speed signal transmission unit (52b) is completed. Battery monitoring device. A battery monitoring device for monitoring an assembled battery (1) configured by connecting a plurality of battery cells (10) in series,
Monitoring means (3) driven by power supply from the assembled battery (1) and monitoring the battery state of the assembled battery (1);
A signal from the control means (4) side to the monitoring means (3) side in a state where the monitoring means (3) and the control means (4) for controlling the operation of the monitoring means (3) are electrically insulated. An insulation signal transmission means (5) for transmitting
The insulation signal transmission means (5) transmits a signal from a primary side element (51) provided on the control means (4) side to a secondary side element (52) provided on the monitoring means (3) side. A high-speed signal transmission unit (52b) for speeding up
The high-speed signal transmission unit (52b) is configured to be driven by power supply from the assembled battery (1),
The monitoring means (3) and the insulation signal transmission means (5) include dark currents that cut off power supply from the assembled battery (1) to the monitoring means (3) and the high-speed signal transmission unit (52b), respectively. Power generation means (6) for generating power for activating the high-speed signal transmission unit (52b) based on a signal transmitted from the primary side element (51) to the secondary side element (52) during the mode Is provided ,
The power generation means (6) includes power storage means (34) for accumulating as a charge a signal transmitted from the primary side element (51) to the secondary side element (52) of the insulation signal transmission means (5). Have
The power storage means (34) is configured to supply power to the high-speed signal transmission unit (52b) when the accumulated charge amount exceeds a predetermined charge amount,
The power generation means (6) has charge accumulation stop means (54) for stopping accumulation of charges in the power storage means (34) after the start of the high-speed signal transmission unit (52b) is completed. Battery monitoring device.

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