JP5028436B2 - Battery controller potential fixing method - Google Patents

Description

  The present invention relates to a control system that monitors and controls the state of a single cell with respect to an increase in the voltage of a storage battery that is formed by connecting single cells in series to form an assembled battery and connecting the assembled batteries in series. The present invention relates to a battery system that realizes downsizing.

  In order to obtain the necessary voltage and current for secondary batteries such as lead, nickel metal hydride, and lithium batteries installed in power equipment such as automobiles and railways and UPS for backup, etc., the cells are connected in series and in parallel. The configuration is known.

  Examples of Documents 1 and 2 are both patents relating to a battery system for a hybrid vehicle.

  In Document 1, in a configuration in which nickel-metal hydride cells are connected in series, a set of a cell and a voltage monitoring unit that monitors the voltage of the cell is connected in series. Each voltage monitoring unit is supplied with power from the cell to be monitored.

  Further, the voltage monitoring units are connected in a daisy chain by communication lines, and are insulated by a photocoupler in the voltage monitoring unit to have a withstand voltage. In this way, the voltage monitoring unit has a voltage of about 12V for the nickel metal hydride battery to be monitored, so only the insulation on the communication line side is required, and it is possible to prevent the voltage monitoring unit from being applied with the voltage for the entire series. , Enhance safety.

  Moreover, in the literature 2, in the structure which connected the lithium cell in series, the system which prevents the overcharge / discharge of a battery by taking the voltage monitoring of a cell and estimating the charge amount of a cell in the whole series is taken. Yes. The cell voltage monitoring circuit and the battery state estimation device are insulated by a photocoupler, and the battery state estimation device is supplied with power from the outside, preventing the voltage of the battery state estimation device itself from being applied in series and safety. Is increasing.

Japanese Patent Laid-Open No. 9-139237 JP 2003-70179 A

  However, while the storage battery mounted on the hybrid vehicle is up to about 500V, the storage battery mounted on the railway vehicle requires 1500 to 2000V. Therefore, if the storage battery is applied as it is, the insulation part of the battery monitoring unit must be able to handle 1500 to 2000V. As a result, there is a problem that the withstand voltage between the voltage monitoring circuit of the single cell and the battery state estimation device is increased, and the cost of the insulation part on the battery state estimation device side and the size of the insulation part are increased.

  In addition, as the voltage increases and the capacity increases, a high voltage portion exists, which causes a risk of electric shock during maintenance.

  Therefore, in the present invention, downsizing and cost reduction of the device have been achieved in response to the increase in voltage and capacity of the storage battery configured by connecting the assembled batteries in which the cells are connected in series in series and parallel. An object is to provide a battery control system and a battery system.

To achieve the above object, at least the battery control device includes a control part, a first communication circuit communicating with the battery control device connected on one side, and a second communication circuit communicating with the battery control device connected on the other side. A power supply circuit that receives power supply from the assembled battery and generates power for the control circuit of the battery control device and power for the second communication circuit, and a first insulation that insulates the control portion from the first communication circuit And a second communication circuit in the battery control device connected on the one side with the first communication circuit in the battery control device, and a second insulation circuit for insulating the control portion and the second communication circuit. Are connected , and the first communication circuit and the negative terminal of the assembled battery connected to the battery control device are electrically connected by wiring, and the assembled battery connected to the potential of the first communication circuit and the battery control device The negative electrode terminal has the same potential as It has a switch that connects the negative terminal of the battery pack to the ground. When the connection of each battery pack is cut off, the switch is switched to ground the negative terminal of each battery pack so that the potential of the communication line is grounded. Set to potential.

  According to the present invention, a battery is connected in series to form an assembled battery, and the battery is configured to be connected in series and parallel. A battery control system and a battery control method are provided.

The figure which shows the structure of one Example of the battery control system in this invention. The figure which shows the electric potential and insulation of the battery control apparatus in FIG. The figure which shows each electric potential in the battery control apparatus in FIG. The figure which shows the structure of another Example of the battery control system in this invention. The figure which shows each electric potential in the battery control apparatus in FIG. The figure which shows the structure of another Example of the battery control system in this invention. The figure which shows each electric potential in the battery control apparatus in FIG. The figure which shows the structure of another Example of the battery control system in this invention. The figure which shows each electric potential in the battery control apparatus in FIG. The block diagram of the battery system which connected the battery control system of FIG. 1 2 parallelly. The block diagram of the battery system which connected the battery control system of FIG. 10 two parallel by another method. The block diagram which connected between the battery control apparatuses in the battery control system in FIG. 10 by another method.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  Examples of the battery control system of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing a configuration of one embodiment of a battery control system according to the present invention.

  The battery control system 1000 has a configuration in which a set of the battery control device 1 and the assembled battery 2 is connected in series. The assembled battery 2 has a configuration in which a plurality of single cells 21 are connected in series, and the output voltage is on the order of several hundred volts. The assembled battery 2 has a positive electrode side terminal 23 and a negative electrode side terminal 24, and the electric power stored in each unit cell 21 is discharged and charged via these terminals 23 and 24.

  The battery control device 1 performs a process of monitoring the unit cell 21, and the adjacent battery control device 1 and the battery control device 1-a are connected to each other via the communication line 50. Further, the battery control device 1-a reports the monitoring processing result to the upper control device 4.

  In addition, the battery control device 1 is connected to the assembled battery 2 by the power line 3, and the battery control device 1 is supplied with electric power necessary for processing by the assembled battery 2.

  Moreover, two battery control devices are connected by connecting the two battery control devices 1 and 1 -a connected to the two assembled batteries 2 and 2-a which are adjacent to each other through the communication line 50 and insulating them. The potential difference between the devices 1 and 1-a can be suppressed to the potential difference of the assembled battery 2 regardless of the number in series. That is, by providing the battery control device 1 with a withstand voltage corresponding to the voltage of the assembled battery 2, a battery control system can be constructed without depending on the series number of the assembled batteries 2. Further, in FIG. 1, the battery control device 1 is connected to one assembled battery 2, but the unit in which a plurality of assembled batteries 2 are connected in series and the battery control device 1 are connected to the power supply line 3. You may connect via.

  Below, the structure of the battery control apparatus 1 is demonstrated.

  The battery control device 1 includes a power supply circuit 10, an MPU (Micro Processor Unit) 20, communication circuits 31 and 32, photocouplers 41 and 42 that are insulating elements, a relay 100, and an intermediate potential generation circuit 110 that is a series resistor for voltage division. Consists of The battery control device connected to the battery control device 1 via the communication circuit 31 and the communication line 50 is (potentially) connected to the lower battery control device 1-a, the communication circuit 32 and the communication line 50-b. The battery control device connected to the battery control device 1 is (potentially) an upper battery control device 1-b.

  The power supply circuit 10 receives power supply from the assembled battery 2 and generates drive power for the MPU 20 of several volts and drive power for the communication circuit 31-b of the communication circuit 32 and the upper battery control device 1-b. Then, the power line 131 supplies the MPU 20 and the power line 132 supplies the communication circuit 32 and the communication circuit 31-b of the upper battery control apparatus 1-b. That is, the power of the communication circuit 31 is supplied from the power circuit 10-a of the lower battery control device 1-a. At this time, the generated drive power for the MPU 20 is insulated from the communication circuit 32 and the drive power for the communication circuit 31-b of the host battery control device 1-b in the power supply circuit.

  On the other hand, the MPU 20 and the communication circuit 31 are connected via an insulating photocoupler 41, and the MPU 20 and the communication circuit 32 are connected via an insulating photocoupler 42, respectively.

  The power supply line 3 is connected to the intermediate potential generation circuit 110 and the power supply circuit 10 via the negative electrode side terminal 24 of the assembled battery 2 and the relay 100. The relay 100 is ON / OFF controlled by the signal line 135-a from the lower battery control device 1-a, and is turned on when a predetermined current flows through the signal line 135-a, and the current flowing through the signal line 135-a. Has a function of turning OFF when is below a predetermined current. In addition, there are a wiring 133 for determining the potential of the power supplied to the MPU 20 and a wiring 134 for determining the potential of the communication circuit 31 connected to the lower battery control device 1-a by the communication line 50. With the wiring 134, the potential of a device such as the communication circuit 31 becomes equal to the potential of the negative terminal 24 of the assembled battery 2.

  In this battery control system 1000, the power-on sequence is such that when the control device 4 turns on the relay 100-a, the power circuit 10-a is activated, and the MPU 20-a, the communication circuit 32-a, and the communication circuit 31 are powered. To supply. When the activated MPU 20-a issues a power ON command for the host battery control device 1 to the communication circuit 32-a via the photocoupler 42-a, the communication circuit 32-a is connected to the signal line 135-a. By flowing a predetermined current, the relay 100 is turned on and the power supply circuit 10 of the battery control device 1 is activated. In this way, the power is turned on sequentially from the lower order to the higher order.

  The power-off sequence is transmitted to all the battery control devices 1 via the communication line 50 when a power-off command is issued from the control device 4, and the termination process is executed by the MPUs 20 of all the battery control devices 1. Is done. When the uppermost battery control device 1 finishes the end process, the uppermost battery control device 1 notifies the lower battery control device 1 that the end process has been completed via the communication line 50. In response to this, the lower battery control device 1 turns off the relay 100 in the uppermost battery control device 1 through the signal line 135. Thereafter, upon completion of the termination process of the MPU 20, the lower battery control apparatus 1 is informed of the completion of the termination process.

  In this way, the power is turned off sequentially from the highest level, and finally, when the control device 4 receives completion of the end process from the lowest level battery control device 1-a, the signal line 135 causes the relay 100-a. Is turned off and all battery control devices 1 are turned off.

  When all battery control devices 1 are turned off urgently when an abnormality occurs, the control device 4 is a signal line for controlling ON / OFF of the relay 100-a in the lowest-order battery control device 1-a. The current of 135 is cut off and the relay 100 is turned off. Thereby, since the power supply circuit 10 of the battery control device 1 is stopped, the communication circuit 32 is also stopped, and the current of the signal line 135 to the relay 100-b of the host battery control device 1-b is cut off. Therefore, the relay 100-b is turned off, and the power supply circuit 10-b of the battery control device 1-b is stopped. Thus, by cutting off the current flowing through the signal line 135 that controls the relay 100, it is possible to turn off all the battery control devices 1 that are higher than that.

  The four potentials and insulation of the battery control device 1 will be described in detail with reference to FIG. The battery control device 1 has a power supply potential 150 with the power supply circuit 10, a microcomputer potential 151 with the MPU 20, a communication L potential 152 with the communication circuit 31, and a communication H potential 153 with the communication circuit 32. The power supply potential 150 is determined by the potential of the negative terminal 24 of the assembled battery 2, and the microcomputer potential 151 is determined by the wiring 130 and the wiring 133 from the intermediate potential generating circuit 110 and becomes an intermediate potential of the output voltage of the assembled battery 2.

  On the other hand, the communication L potential 152 is determined by the wiring 134 from the negative electrode side terminal 24 of the assembled battery 2 and is equivalent to the potential of the negative electrode side terminal 24 of the assembled battery 2. The communication H potential 153 is equivalent to the communication L potential 152-b (that is, the potential of the negative terminal 24-b of the assembled battery 2-b) of the host battery control device 1-b. That is, the communication L potential 152 and the communication H potential of the lower battery control device 1-a are the same potential, and the communication H potential 153 and the communication L potential 152-b of the upper battery control device 1-b are the same potential.

  As described above, the power supply potential 150, the microcomputer potential 151, and the communication H potential 153 are insulated by the photocoupler 41 between the MPU 20 that becomes the microcomputer potential 151 and the communication circuit 31 at the communication L potential 152 by the power supply circuit 10. Insulation between the MPU 20 and the communication circuit 32 at the communication H potential 153 is performed by the photocoupler 42. Further, the power supply potential 150 and the communication L potential 152 are insulated by the relay 100, and the power supply circuit 10 can be turned on / off by the relay 100.

  A two-stage insulation that insulates between the communication L potential 152 and the microcomputer potential 151, and further insulates between the microcomputer potential 151 and the communication H potential 153, and uses a photocoupler having a lower withstand voltage than the one-stage insulation between the microcomputer and the communication circuit. It is possible to reduce the size and cost.

FIG. 3 is a table summarizing each potential of 150 to 153 with respect to ON / OFF of the relay 100 in the configuration shown in FIG. In addition, the voltage of the positive electrode side terminal 23 of the assembled battery 2 is set to _VH , and the voltage of the negative electrode side terminal 24 is set to _VL . When the relay 100 is OFF, since the power supply circuit 10 is not connected to the negative electrode side terminal 24 of the assembled battery 2, the power supply potential 150 becomes the potential V _H of the positive electrode side terminal 23. Further, when the relay 100 is ON, the power supply circuit 150 and the negative electrode side terminal 24 of the assembled battery 2 are connected, so the power supply potential 150 is _VL . That is, the voltage applied to both ends of the relay 100 is V _H −V _L when the relay 100 is OFF, and both the ends of the relay 100 are V _L when the relay 100 is ON. The voltage is zero V (the same potential). Further, since the ON / OFF control signal 135-a of the relay 100 is always _VL due to the wiring 134, when the relay 100 is ON, all the voltages around the relay 100 are _VL . That is, when the current flows through the relay 100, an extra load is not applied to the relay 100, and the life of the relay 100 can be increased.

When the relay 100 is OFF, the voltage applied to both ends of the photocoupler 42 is zero V (the same potential), and the voltage applied to both ends of the photocoupler 41 is V _H −V _L. When the relay 100 is ON, the voltage applied to both ends of the photocoupler 42 and the voltage applied to both ends of the photocoupler 41 are both (V _H −V _L ) / 2. That is, when a current flows, the voltage applied to both ends of the photocoupler 42 and the voltage applied to both ends of the photocoupler 41 are lowered.

As described above, by using the photocouplers 42 and 41 having a withstand voltage of V _H −V _L which is the difference between the voltages at both ends of the assembled battery 2, the potential 153 and the potential 152 are insulated in two stages, thereby A battery control system in which the assembled batteries 2 are connected in series can be constructed using a photocoupler with a low withstand voltage, and can be reduced in size and cost.

  Further, as shown in FIG. 2, the communication L potential 152 is determined by the wiring 134 from the negative electrode side terminal 24 of the assembled battery 2, so that it has the same potential as the negative electrode side terminal 24 of the assembled battery 2. With this function, when maintenance is performed by cutting off the connection of each assembled battery, the potential of the communication line of each battery control device is always grounded by connecting the negative terminal 24 of each assembled battery 2 to the ground. At the time of maintenance, the high voltage part of the battery control system can be eliminated, and accidents such as electric shock can be prevented in advance.

  Then, the case where the assembled batteries 2 and 2-a are connected in parallel is demonstrated using FIG. 4, FIG.

When the assembled batteries 2 and 2-a are connected in parallel, the negative electrodes 24 and 24-a of the assembled batteries 2 and 2-a have the same potential. Accordingly, the communication L potential 152 of the battery control device 1 and the communication H potential 153-a of the battery control device 1-a that are the same potential are both V _L (hereinafter referred to as the communication H potential 153-a).

FIG. 5 shows each potential of the battery control device 1-a and ON / OFF of the relay 100. Regardless of ON / OFF of the relay 100, the potential of the communication H potential 153-a becomes _VL . Even in this case, when the relay 100 is ON, the voltages around the relay are all at the same potential as V _L. When the relay 100 is OFF, the voltage applied to both ends of the photocoupler 42 is V _H −V _L , and the voltage applied to both ends of the photocoupler 41 is V _H −V _L. When the relay 100 is ON, the voltage applied to both ends of the photocoupler 42 and the voltage applied to both ends of the photocoupler 41 are (V _H −V _L ) / 2.

  Therefore, even when the assembled battery 2 is connected in series and in parallel, the potential difference between the same potentials 150 to 153 is the same, and the battery control device 1 which is the configuration of the present embodiment can be used in series or in parallel connection. I understand.

  From the above, by using this battery control device 1, it can be realized even in a multi-parallel state, and the cost reduction of a high voltage and large capacity battery control system can be realized.

  Further, the potential of the communication line 50 connecting the battery control devices 1, 1-a is the same as that of the negative terminals 24, 24-a of the assembled batteries 2, 2-a, and the potential of the communication line 50 is lowered. Can do.

  Subsequently, as another embodiment of the present invention, a configuration of a battery control device 1 ′ that determines each potential of 150 to 153 by a method different from the present embodiment will be described with reference to FIGS. The difference from the above-described embodiment is how to determine the communication H potential 153 and the communication L potential 152.

  FIG. 6 shows a configuration in which a set of the assembled battery 2 and the battery control device 1 ′ is connected in series.

  In FIG. 6, the communication H potential 153 is determined by the wiring 136 from the positive terminal 23 of the assembled battery 2 and becomes the potential level of the positive terminal 23 of the assembled battery 2. On the other hand, the communication L potential 152 becomes the communication H potential 153-a of the lower battery control device 1-a (that is, the potential level of the positive terminal 23-a of the assembled battery 2-a). The communication L potential 152 and the communication H potential of the lower battery control device 1-a are the same potential. The communication H potential 153 and the communication L potential of the upper battery control device 1-a are the same potential.

  As in the case of FIG. 1, the power supply potential 150, the microcomputer potential 151, and the communication H potential 153 are insulated from the MPU 20 that becomes the microcomputer potential 151 by the power supply circuit 10 and the communication circuit 31 at the communication L potential 152. The photocoupler 41 provides insulation between the MPU 20 and the communication circuit 32 at the communication H potential 153 by the photocoupler 42. Further, the power supply potential 150 and the communication L potential 152 are insulated by the relay 100, and the power supply circuit 10 can be turned on / off by the relay 100.

  As shown in FIG. 6, the communication H potential 153 is determined by the wiring 136 from the positive terminal 23 of the assembled battery 2, so that the same potential as that of the positive terminal 23 of the assembled battery 2 is obtained. That is, when performing maintenance, the connection of each assembled battery is cut off, and the potential of the communication line of each battery control device is always a potential that is increased from the ground potential by one assembled battery.

FIG. 7 summarizes the potentials 150 to 153 in the configuration shown in FIG. 6 when the relay 100 is turned ON / OFF. In addition, the voltage of the positive electrode side terminal 23 of the assembled battery 2 is set to _VH , and the voltage of the negative electrode side terminal 24 is set to _VL . When the relay 100 is OFF, since the power supply circuit 10 is not connected to the negative electrode side terminal 24 of the assembled battery 2, the power supply potential 150 becomes the potential V _H of the positive electrode side terminal 23. Further, when the relay 100 is ON, the power supply circuit 150 and the negative electrode side terminal 24 of the assembled battery 2 are connected, so the power supply potential 150 is _VL . That is, the voltage applied to both ends of the relay 100 is V _H −V _L when the relay 100 is OFF, and the voltage applied to both ends of the relay 100 is V _L at both ends of the relay 100 when the relay 100 is ON. 0 V (same potential). Further, since the ON / OFF control signal 135-a of the relay 100 is always V _L , when the relay 100 is ON, all the voltages around the relay 100 become V _L , which is unnecessary when the current flows through the relay 100. The load is not applied and the life of the relay 100 can be increased.

  Next, FIG. 8 shows an embodiment in which the assembled batteries 2 and 2-a are connected in parallel using the battery control device 1 ′ as another embodiment.

FIG. 9 summarizes the potentials 150 to 153 in the configuration shown in FIG. 8 when the relay 100 is turned ON / OFF. Regardless of ON / OFF of the relay 100, the communication L potential 152 becomes V _H. This is because the potential 153-a of the battery control device 1 ′ -a that is the same potential as the communication L potential 152 becomes the potential of the positive terminal 23-a of the assembled battery 2-a due to 136-a. . In this case, when the relay 100 is ON, the potential at both ends of the relay 100 is _VL , but the potential of the ON / OFF control signal 135-a of the relay 100 is _VH . Therefore, when the relay 100 is turned on, a load of V _H −V _L is applied. The voltage applied to both ends of the photocouplers 41 and 42 is 0V for the photocoupler 42 and _VH − _{VL for the} photocoupler 41 when the relay 100 is OFF, and the photocouplers 42 and 41 when the relay 100 is ON. Both are (V _H −V _L ) / 2. Therefore, in the case of FIG. 6, it is possible to reduce the breakdown voltage of the photocoupler 42 to (V _H −V _L ) / 2.

  From the above, by using this battery control device 1 ′ shown in FIG. 6 and FIG. 8, it can be realized even in a multi-parallel state, and cost reduction of a high voltage and large capacity battery control system can be realized.

  On the other hand, the potential of the communication line 50 connecting the battery control devices 1 'and 1'-a is the same as that of the positive terminals 23 and 23-a of the assembled batteries 2 and 2-a. Compared with the battery control device 1 of the embodiment shown in FIG. 4, the potential of the communication line 50 becomes higher.

  Next, FIG. 10 shows that a battery control system with a larger capacity when a plurality of battery control systems are connected in parallel is constructed.

  FIG. 10 shows an example of a battery system 2000 that constitutes a battery control system 1001 using the battery control device 1. The battery system 2000 has a configuration in which the battery control systems 1001 and 1001-a are connected by the uppermost controller 5. In this example, the battery system 2000 includes two battery control systems 1001 and 1001-1, but a plurality of battery control systems have the same configuration.

  In each battery control system 1001, a plurality of assembled batteries 2 are connected in series via a switch 62, and each assembled battery 2 is connected to the battery control device 1 through a power line 3.

  The positive terminal of the uppermost assembled battery 2-a connected in series is connected to the terminal 81, and the negative terminal 24 of the lowermost assembled battery 2-c is connected to the terminal 82. The electric power held by each assembled battery 2 is charged and discharged via the. The assembled battery 2-a and the assembled battery 2-b are connected via a switch 62-a, and the switch 62-a connects the assembled battery 2-a and the assembled battery 2-b, or Whether to connect the negative electrode side of 2-a to the ground 83 via the resistor 63-a is switched. The switch 61 connects and disconnects the positive electrode side terminal and the terminal 81 of the assembled battery 2-a. Further, the switches 61, 62-a, 62-b, and 62-c operate in conjunction with each other.

  On the other hand, the battery control devices 1 are connected to each other by a communication line 50, and the lowest-order battery control device 1-c is connected to the upper control device 4 that controls the entire battery system 2000 with the communication line 50-d. Connected by. A device 6 installed in the battery control system 1001 and including a fan for cooling the assembled battery 2 and a voltage sensor and a current sensor for measuring the voltage and current between the terminals 82 and 83 is connected to the host control device 4. The host control device 4 controls the device 6 based on data input from various sensors and information from the battery control device 1.

  The host control devices 4 are connected to each other by a communication line 51. In FIG. 10, the host control devices 4 are connected by multi-drop, but may be connected individually.

  In the battery control system 2000, the battery control device 1 acquires state information of each assembled battery 2 and communicates the data with the host control device 4 via the communication line 50. For example, the battery control device 1-a is connected via the communication line 50-a, the battery control device 1-b, the communication lines 50-b, 50-c, the battery control device 1-c, and the communication line 50-d. It communicates with the control device 4.

  That is, the battery control device 1-b transmits the state information data from the battery control device 1-a to the communication line 50-b in addition to the state information data of the assembled battery 2-b. In this way, each state control device transmits the information data of the connected assembled battery 2 together with the received information control data.

  Further, when the switch 61 is disconnected and the switches 62-a, 62-b, 62-c are connected to the resistor 63 side, all the negative electrode side terminals of each assembled battery 2 are connected to the ground 83. Accordingly, the communication L potential of the battery control device 1 and the potential of the communication line 50 are all the same as the ground 83, and the terminal 81 is disconnected from the positive electrode side of the assembled battery 2-a. When removing and replacing the battery, there is no danger of electric shock and the work can be performed safely.

  Here, at the moment when the switches 62-a, 62-b, and 62-c are connected to the resistor 63 side, the series voltage of each assembled battery remains in the circuit, so that a large current flows to the ground, etc. The danger remains. Therefore, by providing the resistor 63 between the switches 62-a, 62-b, 62-c and the ground 83, it is possible to prevent a large current from flowing and to eliminate dangers such as electric shock.

  Next, another connection method of the battery control system 1001 is shown in FIGS. FIG. 11 shows a configuration when two battery control devices and the like are connected in parallel in one electronic control system 1001. The first row is composed of assembled batteries 2-a to 2-c and battery control devices 1-a to 1-c connected to the assembled battery 2, and the second row is assembled batteries 2-a-1 to 2-a-1. 2-c-1 and battery control devices 1-a-1 to 1-c-1. The host control device 4 is connected to the battery control devices 1-c and 1-c-1 by communication lines 50-d and 50-d-1. Note that the devices 6 included in the battery control system 1001 are connected to the host control device 4.

  Although FIG. 11 shows an example of a two-parallel configuration, it is possible to achieve a three-parallel configuration or more with a similar connection method.

  FIG. 11 shows an example in which the battery control devices 1 are connected to each other by the communication line 50 in parallel, but FIG. 12 shows a battery in the potential group above that is connected to the battery control device 1 at the same potential. This is a method of connecting to the control device 1. Although the example of FIG. 12 has two parallels, it is possible to have three or more parallels with the same connection.

  Similarly to FIG. 10, in FIGS. 11 and 12, when the switch 62 is connected to the ground 83 side, the negative electrode side terminals of all the assembled batteries 2 are connected to the ground 83. Therefore, the potential of the communication line 50 is all the same as that of the ground 83, and safety in maintenance work such as replacement of the assembled battery 2 can be ensured.

  The above-described embodiments can be applied to the field using a large capacity power storage device. In particular, it is considered to have a great effect when applied to the railway field requiring large capacity and downsizing and requiring maintenance.

DESCRIPTION OF SYMBOLS 1 Battery control apparatus 2 Assembly battery 3 Power supply line 4 High-order control apparatus 10 Power supply circuit 20 MPU
21 Cell 30 Communication Circuit 40 Photocoupler 50 Communication Line 100 Relay 110 Intermediate Potential Generation Circuit

Claims (10)

A plurality of battery control devices that are connected to an assembled battery in which a plurality of cells are connected in series and monitor the state of the assembled battery,
A battery control system for monitoring a storage battery in which a plurality of the assembled batteries are connected,
The battery control device includes a control part,
A first communication circuit communicating with a battery control device connected on one side;
A second communication circuit communicating with the battery control device connected on the other side;
A power supply circuit that receives power supply from the assembled battery and generates power for the control circuit of the battery control device and power for the second communication circuit;
First insulating means for insulating the control portion and the first communication circuit;
A second insulating means for insulating the control portion and the second communication circuit;
The first communication circuit in the battery control device and the second communication circuit in the battery control device connected on the one side are connected ,
The first communication circuit and the negative terminal of the assembled battery connected to the battery control device are electrically connected by wiring, and the assembled battery connected to the potential of the first communication circuit and the battery control device. The negative electrode terminal has the same potential as
It has a switch for connecting the negative electrode side terminal of each assembled battery to the ground, and when the connection of each assembled battery is cut off, by switching the switch and grounding the negative electrode side terminal of each assembled battery, A battery control system characterized in that a potential of a communication line is set to a ground potential . In claim 1,
The intermediate potential generation circuit, which is a series resistor for voltage division connected between the positive terminal and the negative terminal of the assembled battery connected to the battery control device, controls the intermediate potential between the positive terminal and the negative terminal of the assembled battery. A battery control system characterized by having a circuit potential . In claim 1 or claim 2 ,
A battery control system comprising a resistor between the switch and the ground, wherein a large current is suppressed from flowing to the ground when the switch is switched to ground the negative electrode side terminal of each assembled battery. . In any one of Claim 1 thru | or 3 ,
The battery control system , wherein the power supply circuit insulates the generated power for the control circuit from the power for the second communication circuit . In any one of Claim 1 thru | or 3 ,
The battery control device includes a relay circuit that controls ON / OFF of the power supply of the power supply circuit,
In the battery control device, the relay circuit is ON / OFF controlled by a second communication circuit in an adjacent battery control device connected to the first communication circuit . In claim 5,
The first communication circuit in the battery control device arranged at the extreme end of the battery control system is connected to the host control device,
The power supply control system according to claim 1, wherein the relay circuit is powered on in order from the host controller side . In any one of Claim 1 thru | or 3 ,
The battery control system according to claim 1, wherein power of the first communication circuit is supplied from a power supply circuit of the battery control device adjacent to the first communication circuit . A storage battery in which a plurality of assembled batteries in which a plurality of cells are connected in series are connected;
A plurality of battery control devices each connected to the assembled battery and monitoring the state of the assembled battery;
A battery system comprising:
The battery system includes a host control device at one end of a group of battery control devices in which a plurality of the battery control devices are connected in a rosary shape with a communication line,
The battery control device includes a control part,
A first communication circuit that communicates with a battery controller on the host controller side connected in a bead shape;
A second communication circuit communicating with the battery control device on the other side connected in a bead shape;
A power supply circuit that receives power supply from the assembled battery and supplies power to the control circuit of the battery control device and the second communication circuit;
First insulating means for insulating the control portion and the first communication circuit;
Second insulating means for insulating the control portion and the second communication circuit;
The first communication circuit and the negative terminal of the assembled battery connected to the battery control device are electrically connected, and the potential of the first communication circuit and the negative terminal of the assembled battery connected to the battery control device A wiring having the same potential as
A switch for grounding the negative electrode side terminal of each assembled battery,
The battery system is characterized in that when the series connection of each assembled battery is interrupted, the potential of the communication line is set to the ground potential by switching the switch and grounding the negative electrode side terminal of each assembled battery. A storage unit in which a plurality of battery units connected in series, and a plurality of battery units connected in series;
A plurality of battery control devices connected to the assembled battery and monitoring the assembled battery, respectively,
A plurality of the battery control devices connected so as to communicate with each other in series with each other in series,
A host control device communicably connected to the battery control device located at one end of the bead chain,
The battery control device includes a control part,
A first communication circuit that communicates with the battery control device on the side close to the adjacent upper control device connected by a daisy chain;
A second communication circuit that communicates with the adjacent higher-order control device connected by a rosary connection and the battery control device on the far side;
A power supply circuit that receives power supply from the assembled battery and generates a power supply that is driven by a control circuit of the battery control device and a second communication circuit;
The first communication circuit is connected to the second communication circuit of the adjacent battery control device to form a daisy chain,
The first communication circuit and the negative terminal of the assembled battery connected to the battery control device are electrically connected by wiring, and the assembled battery connected to the potential of the first communication circuit and the battery control device. The negative electrode terminal has the same potential as
A switch capable of grounding a negative electrode side terminal of each assembled battery, and switching the switch to ground the negative electrode side terminal of each assembled battery when the connection of each assembled battery is cut off. A battery system characterized in that a potential of a wire can be set to a ground potential. A storage unit in which a plurality of battery units connected in series, and a plurality of battery units connected in series;
A plurality of battery control devices connected to the assembled battery and monitoring the assembled battery, respectively,
A plurality of the battery control devices connected in a communicable manner in a daisy chain;
A host control device communicably connected to the battery control device located at one end of the bead chain,
The battery control device includes a control part,
A first communication circuit that communicates with the battery control device on the side close to the adjacent upper control device connected by a daisy chain;
A second communication circuit that communicates with the adjacent higher-order control device connected by a rosary connection and the battery control device on the far side;
A power supply circuit that receives power supply from the assembled battery and generates a power supply that is driven by a control circuit of the battery control device and a second communication circuit;
The first communication circuit is connected to the second communication circuit of the adjacent battery control device to form a daisy chain,
The first communication circuit and the negative terminal of the assembled battery connected to the battery control device are electrically connected by wiring, and the assembled battery connected to the potential of the first communication circuit and the battery control device. The negative electrode terminal has the same potential as
A switch capable of grounding a negative electrode side terminal of each assembled battery, and switching the switch to ground the negative electrode side terminal of each assembled battery when the connection of each assembled battery is cut off. A battery system characterized in that a potential of a wire can be set to a ground potential.

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