JP2015119580A - Battery control system and battery control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery system capable of dividing entire system into plural insulated blocks to reduce the capacity and withstand voltage of each insulated power source so that the power source voltage of the entire battery system is equal to or larger than a withstand voltage of each insulated power source.SOLUTION: The battery control system is constituted of plural insulated blocks each of which includes plural batteries which are connected to each other in series. Each of the insulated blocks includes one or more battery controllers. The battery controller includes: a monitor circuit for monitoring the batteries; and a first insulated power source that supplies the power to the monitor circuit. The first insulated power source in each of the insulated blocks uses a common power line as a power source and the power lines of each of the insulated blocks are connected to each other via a second insulated power source.

Description

  The present invention relates to a battery control system and a battery control method, and is suitably applied to a battery control system and a battery control method that constitute a control circuit that requires insulation.

  In recent years, battery systems incorporating a large number of batteries, such as power storage devices for mobile objects, power storage devices for grid connection stabilization, and emergency power storage devices, have attracted attention. In order to bring out the performance of these battery systems, parameters such as the battery charge rate (SOC: State Of Charge), the degree of deterioration (SOH: State Of Health), and the maximum chargeable / dischargeable current (allowable charge / discharge current) are set. It is necessary to calculate or to properly arrange the charging rates of the respective batteries. In order to realize these, a battery voltage measurement circuit (cell controller) is attached to each battery, and a battery controller equipped with a central processing unit (CPU) is installed based on information sent from the cell controller. The above calculation or predetermined operation is executed.

  When the number of batteries incorporated in the battery system is several tens or more, it is common to use a battery module incorporating several to several tens of batteries and a cell controller, and connecting a plurality of them in series and parallel. It has become. In such a configuration, the communication between the cell controller and the battery controller is insulated inside the cell controller for safety, so that leakage or electric shock due to a communication line connecting the two does not occur. Further, when the withstand voltage of the insulating element on the cell controller is less than the withstand voltage required by the battery system, an insulating element is added on the battery controller side.

  Some battery modules have a built-in battery controller. A battery controller incorporating a battery module is configured to supply power for operating the battery controller from the outside in order to prevent battery consumption. A system controller is provided in the battery system, and the system controller collects information output from each battery controller and issues a command to each battery controller. Here, when the withstand voltage of the insulating element in the cell controller portion is less than the withstand voltage required by the battery system, an insulating element is added between the battery controller and the system controller.

  As described above, when an insulating element is added between the battery controller and the system controller, a method of supplying power to the insulated side becomes a problem. In order to solve this problem, Patent Document 1 uses a power supply configuration in which a power supply using an insulating transformer is provided for each module block unit.

JP 2000-358325 A

  However, when an insulated power source using an insulating transformer is used for each module block unit, each insulated power source must have a performance that satisfies the withstand voltage required by the battery system. For this reason, there is a problem that each insulated power supply becomes large and expensive in a system that requires a withstand voltage of 1,000 volts or more, particularly for railway applications.

  The present invention has been made in consideration of the above points. The entire battery system is divided into a plurality of insulating blocks to reduce the capacity and withstand voltage of each insulated power supply, and the power supply voltage of the entire battery system is reduced to each insulated power supply. A battery control system and a battery control method capable of achieving a breakdown voltage or higher are proposed.

  In order to solve this problem, in the present invention, a plurality of insulating blocks connected to a plurality of batteries connected in series are provided, each insulating block including one or more battery controllers, And a monitoring circuit for monitoring the battery, and a first insulating power supply for supplying power to the monitoring circuit, and the first insulating power supply in each insulating block uses a common power line as a power source, and each insulating block A battery control system is provided in which the power lines included in are connected to each other via a second insulated power supply.

  According to such a configuration, the withstand voltage required for the first isolated power supply or the second isolated power supply can be made smaller than the withstand voltage required for the entire battery system. The battery can be used, and the size and cost of each module of the battery control system can be reduced.

  According to the present invention, the battery system as a whole is divided into a plurality of insulating blocks to reduce the capacity and withstand voltage of each isolated power supply, and the power supply voltage of the entire battery system is set to be higher than the withstand voltage of each insulated power supply. A system can be constructed.

It is a block diagram which shows the structure of the battery system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the battery module concerning the embodiment. It is a block diagram which shows the structure of the cell controller concerning the embodiment. It is a block diagram which shows the insulated power supply structure of the battery system concerning the embodiment. It is a block diagram which shows the structure of the battery module which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the power supply structure of the battery system which concerns on the 3rd Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Overall Configuration of Battery System First, the configuration of the battery system 100 will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a battery system that supplies battery power to a load. Since the output voltage of the battery system 100 is a DC voltage that varies depending on the remaining capacity of the battery, the output current, and the like, it may not be suitable for supplying power directly to the load 111. Therefore, in the present embodiment, the inverter 110 controlled by the host controller 112 converts the output voltage of the battery system 100 into a three-phase alternating current and supplies it to the load 111. Note that the same configuration is used when a DC voltage, other multiphase AC, or single phase AC is supplied to the load 111.

  Moreover, when the load 111 outputs electric power, the electric power output from the load 111 can be stored in the battery system 100 by using the inverter 110 as a bidirectional inverter. Further, by connecting the charging system to the battery system 100 in parallel with the inverter 110, the battery system 100 can be charged as necessary.

  The battery system 100 transmits various information useful for controlling the inverter 110 and the load 111 to the host controller 112. Various types of information relate to battery status such as battery charge rate (SOC) and deterioration rate (SOH), maximum charge current / discharge current (allowable charge / discharge current) that can be passed, battery temperature, and battery abnormality. Information can be exemplified. The host controller 112 performs various processes such as energy management and abnormality detection based on the information provided from the battery system 100. When the host controller 112 determines that the battery system 100 should be disconnected from the inverter 110 or the load 111, the host controller 112 transmits a disconnection instruction to the battery system 100.

  Further, the battery system 100 includes one or more battery modules 105 connected in series and parallel, a system controller 103 that monitors, estimates, and controls the state of the battery system 100, a relay 106 that intermittently outputs the battery system 100, The current sensor 108 that measures the current flowing through the battery, the relay 113 that intermittently connects each battery module, the voltage sensor 602 that measures the battery voltage, and the insulation resistance between the battery system 100 and, for example, the ground are measured. The leakage sensor 603 includes a circuit breaker 107 provided in accordance with the output voltage of the battery system 100. Hereinafter, each part will be described in detail.

  The battery module 105 has a plurality of unit batteries, and measures the temperature inside the module and the voltage of each battery. Further, charging / discharging in units of single cells is performed as necessary. Thereby, voltage monitoring and voltage adjustment can be performed in units of single cells, and temperature information necessary for estimating the state of the battery whose characteristics change according to temperature can be measured. The battery module 105 will be described in detail later.

  In addition, a current sensor 108 and a relay 113 are connected in series to the battery module 105. Thereby, the current value necessary for monitoring / estimating the state of the battery module 105 can be measured. Moreover, each series of the battery modules 105 can be intermittentd based on a command from the host controller.

  For example, when the battery module 105 has a high voltage of 100 V or higher, a circuit breaker 107 for manually interrupting power input / output to the battery system 100 may be added. In this way, by forcibly shutting off using the circuit breaker 107, an electric shock accident or a short-circuit accident can be prevented when the battery system 100 is assembled or disassembled, or when a device equipped with the battery system 100 is handled. It becomes possible.

  When a plurality of battery modules 105 are connected in parallel, relays 113, circuit breakers 107, and current sensors 108 may be provided in each column. Conversely, relays 113 and current sensors 108 are connected from each column. The relay 106 and the current sensor 108 may be provided only at the output portion of the battery system 100 that is omitted. Moreover, the relay 113, the circuit breaker 107, and the current sensor 108 may be provided in each row, and the relay 106 and the current sensor 108 may be further provided at the output unit of the battery system 100.

  The relay 106 and the relay 113 may be configured as a single relay, or may be configured as a set of a main relay, a precharge relay, and a resistor. In the latter configuration, a resistor is arranged in series with the precharge relay, and these are connected in parallel with the main relay. When connecting the relay 106, first a precharge relay is connected. Since the current flowing through the precharge relay is limited by the resistance connected in series, the inrush current that can occur in the former configuration can be limited. Then, after the current flowing through the precharge relay becomes sufficiently small, the main relay is connected. The timing of main relay connection may be based on the current flowing through the precharge relay, or may be based on the voltage applied to the resistance or the voltage across the terminals of the main relay. Further, the timing of main relay connection may be based on the time elapsed since the precharge relay was connected.

  The voltage sensor 602 is connected to one or a plurality of battery modules 105, for example, connected in parallel to each series of battery modules 105. The voltage sensor 602 measures a voltage value necessary for monitoring and estimating the state of the battery module 105. In addition, a leakage sensor 603 is connected to the battery module 105 to detect a state where leakage can occur before leakage occurs, that is, a state where the insulation resistance is reduced, thereby preventing the occurrence of an accident.

  In addition, values measured by the battery module 105, the current sensor 108, the voltage sensor 602, and the leakage sensor 603 are transmitted to the system controller 103, and the system controller 103 monitors and estimates the state of the battery based on these values. Control the whole. Here, control of the entire system by the system controller 103 is, for example, charge / discharge control for each unit battery for equalizing the voltage of each unit battery, power control for each sensor, sensor addressing, the system controller 103. And control of the relay 106 connected to the.

  The system controller 103 includes a CPU 601 that controls the entire battery system 100. Specifically, the CPU 601 performs calculations necessary for battery state monitoring, estimation, and control. The battery system 100 may include a system cooling fan, and the system controller 103 may control the fan. As described above, the battery system 100 performs the control up to the cooling, thereby reducing the communication amount with the host controller.

  Further, the system controller 103 may incorporate a voltage sensor 602 and a leakage sensor 603. By incorporating the voltage sensor 602 and the leakage sensor 603, it is possible to reduce the number of harnesses and to save the trouble of sensor installation compared to the case of preparing individual sensors. However, by incorporating the sensor, the scale (maximum output voltage, current, etc.) of the battery system 100 that can be handled by the system controller 103 is limited. Therefore, the voltage sensor 602 and the earth leakage sensor 603 may be intentionally provided as separate parts from the system controller 103 so that the system configuration has a degree of freedom.

(1-2) Configuration of Battery Module Next, the battery module 105 will be described with reference to FIG. As shown in FIG. 2, the battery module 105 includes a plurality of batteries 201 connected in series, and cell controllers 202a and 202b that monitor the voltage of each battery 201 and charge / discharge each battery 201 as necessary. The battery controller 203 is configured to communicate with the cell controller 202 and estimate the state of the battery 201, etc.

  The battery controller 203 includes a transmission unit 204 that transmits a communication signal to the cell controller 202, a reception unit 205 that receives the communication signal, a transmission / reception unit 206 that transmits and receives information or commands to and from the system controller 103, and the like, state estimation of the cell controller 202, and the like CPU 207 for performing the above and an insulated power source 208 for supplying power to the cell controller 202. Hereinafter, each part will be described in detail.

  The transmission unit 204 outputs a signal for starting communication and a signal for instructing which battery 201 should be charged / discharged to the cell controller 202a via the signal line 211. The output timing and output contents of the output signal are calculated by the CPU 207. The GND potential of the signal to be transmitted is the same as the output-side GND potential of the insulated power supply 208.

  The receiving unit 205 receives the communication signal output from the cell controller 202b via the signal line 212. The communication signal output from the cell controller 202b includes the voltage of each battery 201, the temperature of each part of the battery module 105, the presence / absence of abnormality of the cell controller 202, and the like. Analysis of the signal received by the receiving unit 205 is performed by the CPU 207. The GND potential of the signal received by the receiving unit 205 is the same as the output-side GND potential of the insulated power supply 208.

  The transmission / reception unit 206 transmits / receives information to / from the system controller 103 or the host controller 112 via the signal line 209. The CPU 207 performs determination of transmission contents and transmission timing of information transmitted or received by the transmission / reception unit 206 and analysis of reception contents. The GND potential of the signal to be transmitted / received is the same as the GND potential on the input side of the insulated power supply 208.

  The CPU 207 determines whether there is an abnormality in the battery 201, estimates the battery charge rate (SOC) and battery deterioration (SOH), calculates the allowable charge / discharge current, and equalizes the charge rate (SOC) variation between the batteries 201. Control, check communication errors such as bit corruption of received contents and timeout, determine transmission contents and transmission timing, save and read control information, etc.

  Electric power necessary for the operation of the CPU 207 is received from the insulated power supply 208. In addition, the GND potential of signals input to and output from the transmission unit 204, the reception unit 205, and the transmission / reception unit 206 is the same as the output side GND potential of the insulated power supply 208.

  The insulated power supply 208 adjusts the power received from the power line 210 to an appropriate voltage and sends it to the transmission unit 204, the reception unit 205, the transmission / reception unit 206, the CPU 207, and the cell controller 202. Power transmission from the insulated power supply 208 to the cell controller 202 is performed via the power line 213.

  The cell controller 202 measures the voltage of each battery 201 and the temperature distribution of the battery module 105 and transmits information to the battery controller 203 at a timing designated by the battery controller 203.

  In FIG. 2, two cell controllers 202a and 202b are connected in a daisy chain. A command from the battery controller 203 is first sent to the cell controller 202a via the signal line 211. When the command is addressed to itself, the cell controller 202a analyzes and processes the contents.

  Examples of commands processed by the cell controller 202a include transmission of measurement results and individual discharge of the battery 201. Then, the cell controller 202a outputs the processing result to the signal line 214. When the command is not addressed to itself, the cell controller 202a outputs the command to the signal line 214 as it is.

  When the content received from the signal line 214 is an instruction addressed to the cell controller 202b, the cell controller 202b performs the same processing as the cell controller 202a and outputs the result to the signal line 212. On the other hand, if the received content is not a command addressed to itself, the received content is output to the signal line 212 as it is. These transmissions and receptions are performed via an insulating element 216 described later. Electric power necessary for the operation of the insulating element 216 is received from the battery controller 203 via the power line 213.

  As described above, the cell controller 202 and the battery controller 203 have a loop-shaped daisy chain configuration, so that the withstand voltage required for the insulating element 216 mounted on the cell controller 202 can be reduced. Further, even if the number of cell controllers 202 is increased, it is not necessary to increase the number of communication ports of the battery controller 203.

(1-3) Configuration of Cell Controller Next, the cell controller 202 will be described in detail with reference to FIG. As shown in FIG. 3, the cell controller 202 is connected to a plurality of batteries 201 and includes a plurality of cell controller ICs 251 and insulating elements 216. Hereinafter, each part will be described in detail.

  The plurality of batteries 201 are connected in series to generate a necessary voltage. Each battery 201 is also connected to the cell controller IC 251 via the voltage detection line 215, and voltage monitoring and charging / discharging of each battery 201 by the cell controller IS251 is enabled.

  A plurality of cell controller ICs 251 exist in the battery module 105 and are connected to several to tens of batteries 201, respectively. The cell controller ICs 251 are connected to each other by a signal line 217, and one-way communication, for example, communication from the cell controller 251a to the cell controller 251b and from the cell controller 251b to the cell controller 251c is performed.

  The battery controller 203 sends a signal to the cell controller 251a via the signal line 211 and the insulating element 216a. Further, the cell controller 251c sends a signal to the battery controller 203 via the insulating element 216c and the signal line 214.

  The cell controller IC 251 includes a multiplexer (MUX) 301, an analog / digital converter (ADC) 302, a communication circuit 303, and a power supply 306. In each circuit, the lowest voltage among the voltage detection lines 215 connected to the cell controller IC 251 operates as the GND potential. And cell controller IC251 monitors the voltage of each battery 201 connected, and charges / discharges the battery 201 separately as needed.

  A voltage detection line 215 is connected to the multiplexer (MUX) 301, and an appropriate one for measuring the voltage of the battery 201 is selected and output to the ADC 302 in accordance with an instruction from a control circuit (not shown).

  The ADC 302 converts the voltage (analog voltage) selected by the multiplexer 301 into a digital numerical value, and stores the converted result in a measurement result storage element (not shown). Since high precision is required for this measurement, for example, chopping is performed in cooperation with the multiplexer (MUX) 301. Alternatively, in order to reduce the input range, the output from the multiplexer (MUX) 301 may be the difference between the two voltage detection lines 215, and a voltage corresponding to the voltage of the battery 201 may be sent directly to the ADC 302.

  When the communication circuit 303 analyzes the signal input to the communication input 304 and determines that it is a command for its own IC, the communication circuit 303 instructs the control circuit according to the content of the command and outputs the result from the communication output 305. As a result, the measurement result stored in the above-mentioned measurement result storage element, the result of charging / discharging of the battery 201, etc. are mentioned, for example. If the signal input to the communication input 304 is not a command for its own IC, the communication circuit 303 outputs the input signal as it is to the communication output 305.

  Here, the voltage input to the communication circuit 303 may be too high for the digital circuit of the cell controller IC 251. For example, the signal input to the communication circuit 303b is based on the GND1 (309a) of the cell controller IC 251a, which is higher in potential by four batteries than the GND2 (309b) of the cell controller IC 251b. In order to solve this problem, the communication circuit 303 includes a level shift circuit that shifts the potential of the input signal to a lower level.

  The power source 306 is connected to the battery 201 via the maximum potential power line 307 and the minimum potential power line 308, and generates a voltage necessary for the operation of the cell controller IC 251 from the connected battery 201. The maximum potential power line 307 is connected via a voltage detection line 215 to the positive electrode side of the battery at the highest potential among the batteries 201 connected to the cell controller IC 251. The minimum potential power line 308 is connected to the negative electrode side of the battery at the lowest potential among the batteries 201 connected to the cell controller IC 251 via the voltage detection line 215.

  As shown in FIG. 3, each cell controller IC 251 has a different GND (GND1 (309a), GND2 (309b), GND3 (309c)), and these GNDs provide a withstand voltage required for each cell controller IC251. Corresponds to the number of batteries connected to each cell controller IC 251. This is a fraction of 1 to a few tenths of the voltage of the battery system 100 or the voltage of the battery module 105, which enables the circuit to be integrated into an IC.

  In addition, since the adjacent cell controller ICs 251 are also adjacent in terms of potential, communication between the two can be realized only by level shifting the potential as described above without special insulation. Become. As a result, it is possible to reduce the parts required for communication.

  The insulation element 216 performs insulation between the cell controller IC 251 and the battery controller 203. Thereby, it is possible to secure a withstand voltage between the cell controller IC 251 and the battery controller 203 that are not necessarily close in potential. Further, electric shock is prevented by preventing current from flowing between the battery controller 203 and the battery 201 that are generally connected to a signal system that can be touched by humans. The power necessary for the operation of the insulating element 216 is obtained from the battery 201 on the cell controller IC side. Further, the battery controller side is obtained from the power line 213 from the battery controller 203.

(1-4) Configuration of Insulated Power Supply Next, the configuration of the insulated power supply in the battery system 100 will be described with reference to FIG. In the battery system 100, the system controller 103 operates by receiving power from the external power source 114. Part of the received power is also sent to the insulated power supply 604.

  The output of the insulated power supply 604 is inputted to the insulated power supplies 208a and 208b built in the battery controllers 203a and 203b, and operates the insulating elements 216 in the battery controller and the cell controllers 202a and 202b. The number of battery controllers 203 that can be connected to the output of the insulated power supply 604 is determined by the withstand voltage of the insulated power supply 208.

  The number of battery controllers 203 is obtained by the breakdown voltage of the insulated power supply 208 ÷ the maximum output voltage of the battery module 105. For example, if the maximum output voltage of the battery module 105 is 210V and the withstand voltage of the insulated power supply 208 is 600V, the maximum number of battery controllers 203 that can be connected is two. The output of the isolated power source 604 is further input to the isolated power source 605. For this reason, the power capacity of the insulated power supply 604 is set to a value sufficient to send sufficient power to the battery controller 203 and the insulated power supply 605.

  The output of the insulated power supply 605 is input to the insulated power supplies 208c and 208d built in the battery controllers 203c and 203d, and operates the insulating elements 216 in these battery controllers and cell controllers 202c and 202d. The number of battery controllers 203 that can be connected to the output of the insulated power supply 605 is obtained in the same manner as the insulated power supply 604.

  When there are more battery modules, the output of the isolated power source 605 is input to another isolated power source and supplies power to a plurality of battery controllers 203 in the same manner as the isolated power source 605. And this structure is repeated so that electric power can be supplied to all the battery controllers 203. FIG.

  In the battery system 100, since the batteries 201 are connected in series, the potential difference between adjacent battery modules is small. In this way, by utilizing the fact that the potential difference between adjacent battery modules is small, by adopting such a configuration, the withstand voltage required for the insulated power supply is distributed to the insulated power supply 208, the insulated power supply 604, and the insulated power supply 605. It becomes possible to make it.

  Conventionally, when the withstand voltage required for the battery system 100 increases, it has conventionally been necessary to replace the insulated power supply 208 built in the battery module 105. However, in the present embodiment, as described above, a plurality of insulated power supplies carry the breakdown voltage in a distributed manner. For this reason, it is possible to increase the withstand voltage of the battery system 100 without replacing the insulated power source 208 by increasing the withstand voltages of the insulated power source 604 and the insulated power source 605 or providing a plurality of insulated power sources 605.

  Even when a battery controller 203 or the like is newly designed, the withstand voltage required for the insulated power supplies 208, 604, and 605 can be made smaller than the withstand voltage required for the battery system 100 as a whole. A withstand voltage insulated power supply can be used, and the size and cost of the battery system 100, the system controller 103, and the battery controller 203 can be reduced.

  Each insulated power source 604 and 605 needs to have a larger capacity than the insulated power source 208. Although the total number of insulated power supplies increases as compared with the case where the insulated power supply 208 is replaced with one having a sufficiently high withstand voltage, in general, a higher withstand voltage is more expensive than a larger capacity of the insulated power supply. Further, with the configuration as in this embodiment, the number of isolated power supplies that increase is about several per series, so that the cost of the entire battery system 100 can be reduced. Note that the withstand voltage required for the insulated power supplies 604 and 605 is the maximum output voltage of the battery system 100 minus the withstand voltage of the insulated power supply 208.

(2) Second Embodiment Next, a second embodiment will be described with reference to FIG. Below, an example of the battery system which combined the insulated power supply and the non-insulated power supply is demonstrated. FIG. 5 is a configuration example of the battery module 105 in the present embodiment. In the configuration of FIG. 5, a non-insulated power source 220 exists between the isolated power source 208 and the power line 210. Hereinafter, a configuration different from the battery system 100 of the first embodiment will be described in detail, and a detailed description of the same configuration as that of the first embodiment will be omitted.

  The non-insulated power supply 220 receives electric power from the power line 210, adjusts it to an appropriate voltage and sends it to the transmission unit 204, the reception unit 205, the transmission / reception unit 206, and the CPU 207. Further, the non-isolated power source 220 supplies power required by the cell controller 202 via the isolated power source 208.

  In FIG. 5, the non-insulated power source 220 and the isolated power source 208 are in series. However, the insulated power source 208 may be configured to be connected in parallel so that power is directly supplied from the power line 210. Thus, by separating the insulated power supply into a part that requires insulated power supply and an unnecessary part, it is possible to reduce the capacity of the expensive insulated power supply 208 compared to the non-insulated power supply, and the cost of the battery system 100 Can be reduced. Such a configuration can also be applied to the insulated power source 604 and the insulated power source 605 in FIG.

(3) Third Embodiment Next, a third embodiment will be described with reference to FIG. Below, an example of the battery system using alternating current as a power supply is demonstrated. FIG. 6 shows an example of the power supply configuration of battery system 100 in the present embodiment. In this configuration, battery system 100 operates by receiving power from AC power supply 402. Hereinafter, a configuration different from the battery system 100 of the first embodiment will be described in detail, and a detailed description of the same configuration as that of the first embodiment will be omitted.

  The system controller 103 receives power from the AC power supply 402 by the insulation transformer 401 and outputs it to the power line 403. The output AC power is output to the battery controller 203a and the battery controller 203b. The battery controller 203 includes an insulating transformer 410 and an AC / DC converter 411 instead of the insulating power supply 208 of the first embodiment, and the AC power input to the battery controller 203 is input to the insulating transformer 410.

  The AC power input to the insulating transformer 410 is input to the AC / DC converter 411 and converted to DC. The converted power is output to other circuits of the battery controller 203, for example, a transmission unit 204, a reception unit 205, a transmission / reception unit 206, a CPU 207, and a cell controller 202 after appropriate voltage.

  The AC power output from the insulating transformer 401 is also output to the insulating transformer 404 via the power line 403. The insulating transformer 404 supplies AC power to the battery controller 203c and the battery controller 203d via the power line 405.

  In this way, using the insulating transformers 401 and 404 in place of the insulating power supplies 604 and 605 can reduce these costs. Further, as in the first embodiment, the withstand voltage required for the battery system can be shared by the isolation transformers 401, 404, and 410, so that the required withstand voltage can be reduced and the isolation transformer 410 alone can be used for insulation. The cost and the size of the insulating transformer 410 can be reduced as compared with the case of performing the above. Note that the breakdown voltage required for each isolation transformer is the same as that of the first embodiment, and a detailed description thereof will be omitted.

DESCRIPTION OF SYMBOLS 100 Battery system 103 System controller 104 Power line 105 Battery module 106 Relay 107 Circuit breaker 108 Current sensor 110 Inverter 111 Load 112 Host controller 113 Relay 114 External power supply 201 Battery 202 Cell controller 203 Battery controller 204 Transmission part 205 Reception part 206 Transmission / reception part 207 CPU
208 Insulated power supply 209, 211, 212, 214 Signal line 210, 213 Power line 215 Voltage detection line 216 Insulating element 217 Signal line 218, 219 Insulated power supply 220 Non-isolated power supply 301 Multiplexer (MUX)
302 Analog-to-digital converter (ADC)
303 Communication Circuit 304 Communication Input 305 Communication Output 306 Power Supply 307 Maximum Potential Power Line 308 Minimum Potential Power Line 309 GND Line 310 Power Line 401, 404, 410 Insulation Transformer 402 AC External Power Supply 403, 405 AC Power Line 411 AC / DC Converter 601 CPU
602 Voltage sensor 603 Leakage sensor 604, 605 Insulated power supply

Claims (6)

Consists of a plurality of insulating blocks connected to a plurality of batteries connected in series,
Each insulating block comprises one or more battery controllers,
The battery controller includes a monitoring circuit that monitors the battery, and a first insulated power source that supplies power to the monitoring circuit,
The first insulated power supply in each insulated block uses a common power line as the power supply,
The power line of each insulating block is connected to each other via a second insulating power supply. A non-insulated power source that operates using a common power line in the insulating block as a power source;
The battery control system according to claim 1, wherein the first insulated power supply operates using power output from the non-insulated power supply as a power supply. 3. The battery control system according to claim 1, wherein a breakdown voltage of the first insulated power supply is smaller than a maximum output voltage of the plurality of batteries connected in series. The battery control system according to claim 1, wherein a breakdown voltage of the first insulated power supply is smaller than a breakdown voltage of the second insulated power supply. Having a plurality of insulating blocks with a plurality of batteries connected in series,
Each of the insulating blocks comprises one or more battery controllers,
The battery controller includes a monitoring circuit that monitors the battery, and a first insulation transformer that supplies power to the monitoring circuit,
The first insulating transformer of each of the insulating blocks uses a common power line as a power source,
The power line included in each of the insulating blocks is connected to each other via a second insulating transformer. A plurality of batteries connected in series;
A monitoring circuit for the battery that increases or decreases depending on the number of series-parallel batteries;
A battery control method in a battery control system comprising:
The monitoring circuit is
The insulation circuit is divided into a plurality of insulation blocks so as not to exceed the withstand voltage of the low withstand voltage insulated power supply included in the monitoring circuit, and the low withstand voltage insulated power supply in the insulation block has a common power line as an input, and the power between the insulated blocks Is transmitted and received by a high-voltage insulated power supply.