WO2013051688A1

WO2013051688A1 - Battery state management device, battery state management method

Info

Publication number: WO2013051688A1
Application number: PCT/JP2012/075917
Authority: WO
Inventors: 睦菊地; 彰彦工藤; 金井　友範; 光三浦; 江守　昭彦
Original assignee: 日立ビークルエナジー株式会社
Priority date: 2011-10-07
Filing date: 2012-10-05
Publication date: 2013-04-11
Also published as: JP2013085363A

Abstract

A battery cell group is connected to a battery monitor configured to monitor the state of the batteries for each battery cell group and to wirelessly transmit the monitoring results to a battery state management device. This battery monitoring device is provided with an identification circuit which performs identification for determining whether or not the battery state management device is a legitimate communication partner. If the identification circuit determines that the battery state management device is a legitimate communication partner, then the battery monitoring device wirelessly transmits to the battery state management device the monitoring results of the battery cell groups that the battery monitoring device is connected to. The battery state management device manages the states of the batteries on the basis of monitoring results wirelessly transmitted from battery monitoring devices.

Description

Battery state management device and battery state management method

The present invention relates to a battery state management device and a battery state management method.

Conventionally, in response to an instruction signal transmitted wirelessly from the management unit, the activation circuit turns on the switch to activate the battery information acquisition circuit or the wireless circuit, and the battery information acquired by the battery information acquisition circuit is transferred from the wireless circuit to the management unit. A battery information management system for wireless transmission is known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-81716

However, since the battery information cannot be acquired when the management unit is not operating in the system described in Patent Document 1, it is not sufficient for use in the management of the battery state performed in a stage before being incorporated in a vehicle or the like. It was.

A battery state management device according to an aspect of the present invention manages a state of a battery configured by connecting one or a plurality of battery cell groups each configured by one or a plurality of battery cells connected in series. The battery cell group is connected to a battery monitoring device configured to monitor a battery state for each battery cell group and wirelessly transmit a monitoring result to the battery state management device. The monitoring device includes an authentication circuit that performs authentication for determining whether or not the battery state management device is a valid communication destination, and when the battery state management device is determined to be a valid communication destination by the authentication circuit The battery monitoring device wirelessly transmits the monitoring result of the connected battery cell group to the battery state management device, and the battery state management device is wirelessly transmitted from the battery monitoring device. Based on the result, and manages the state of the battery.
A battery state management method according to an aspect of the present invention manages a state of a battery configured by connecting one or a plurality of battery cell groups each configured by one or a plurality of battery cells connected in series. The battery cell group is configured to monitor a battery state for each battery cell group and wirelessly transmit a monitoring result to the battery state management device. It is connected to the monitoring device, and the battery monitoring device performs authentication for determining whether or not the battery state management device is a valid communication destination, and the battery state management device is a valid communication destination by the authentication. When the determination is made, the monitoring result of the battery cell group to which the battery monitoring device is connected is wirelessly transmitted from the battery monitoring device to the battery state management device. Based from the battery monitoring device to a wireless transmitted monitoring result, and manages the state of the battery.

According to the present invention, it is possible to appropriately manage the battery state at a stage before the battery monitoring system that transmits and receives information between the battery monitoring device and the host controller using a wireless signal is incorporated in a vehicle or the like.

It is a block diagram which shows the drive system of the rotary electric machine for vehicles. It is a block diagram of battery monitoring apparatus BM1. 3 is a block diagram of a battery monitoring circuit 35. FIG. It is a figure which shows schematic structure of a battery state management system. It is a figure explaining a battery state management method. It is a flowchart which shows the process sequence of a battery state management apparatus. It is a flowchart which shows the process sequence of a battery monitoring apparatus. It is a figure which shows an example of the procedure of an authentication process.

Hereinafter, a drive system for a rotating electrical machine for a vehicle employing a battery monitoring system according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a drive system for a rotating electrical machine for a vehicle that employs a battery monitoring system according to the present invention. The drive system shown in FIG. 1 includes a battery module 9, a battery monitoring system 100 that monitors the battery module 9, an inverter device 220 that converts DC power from the battery module 9 into three-phase AC power, and a motor 230 for driving the vehicle. I have. Motor 230 is driven by the three-phase AC power from inverter device 220. The inverter device 220 and the battery monitoring system 100 are connected by CAN communication, and the inverter device 220 functions as a host controller for the battery monitoring system 100. Further, the inverter device 220 operates based on command information from a host controller (not shown).

The inverter device 220 includes a power module 226, a driver circuit 224 for driving the power module 226, and an MCU 222 for controlling the driver circuit 224. The power module 226 converts the DC power supplied from the battery module 9 into three-phase AC power for driving the motor 230. Although not shown, a large-capacity smoothing capacitor of about 700 μF to about 2000 μF is provided between the high voltage lines HV + and HV− where the power module 226 is connected to the battery module 9. The smoothing capacitor serves to reduce voltage noise applied to the integrated circuit provided in the battery monitoring system 100.

Since the charge of the smoothing capacitor is substantially zero in the operation start state of the inverter device 220, when a relay RL of a battery disconnect unit BDU described later is closed, a large initial current flows from the battery module 9 to the smoothing capacitor. Due to this large current, the relay RL may be fused and damaged. In order to solve this problem, the MCU 222 charges the smoothing capacitor by first changing the precharge relay RLP from the open state to the closed state at the start of driving of the motor 230 in accordance with a command from a higher-order controller. At this time, the smoothing capacitor is charged while limiting the maximum current via the resistor RP. Thereafter, the relay RL is changed from the open state to the closed state, and supply of electric power from the battery module 9 to the inverter device 220 is started. By performing such an operation, it is possible to protect the relay circuit, reduce the maximum current flowing through the battery module 9 and the inverter device 220 to a predetermined value or less, and maintain high safety.

The inverter device 220 controls the phase of the AC power generated by the power module 226 with respect to the rotor of the motor 230, and operates the motor 230 as a generator during vehicle braking. That is, regenerative braking control is performed, and the battery module 9 is charged by regenerating the power generated by the generator operation to the battery module 9. Even when the state of charge of the battery module 9 falls below the reference state, the inverter device 220 operates using the motor 230 as a generator. The three-phase AC power generated by the motor 230 is converted into DC power by the power module 226 and supplied to the battery module 9. As a result, the battery module 9 is charged.

When charging the battery module 9 by regenerative braking control, the MCU 222 controls the driver circuit 224 so as to generate a rotating magnetic field that is delayed with respect to the rotation of the rotor of the motor 230. In response to this control, the driver circuit 224 controls the switching operation of the power module 226. Thus, AC power from the motor 230 is supplied to the power module 226, converted into DC power by the power module 226, and supplied to the battery module 9. As a result, the motor 230 acts as a generator.

On the other hand, when powering the motor 230, the MCU 222 controls the driver circuit 224 so as to generate a rotating magnetic field in the advancing direction with respect to the rotation of the rotor of the motor 230, in accordance with a command from the host controller. In response to this control, the driver circuit 224 controls the switching operation of the power module 226. Thereby, DC power from the battery module 9 is supplied to the power module 226, converted into AC power by the power module 226, and supplied to the motor 230.

The power module 226 of the inverter device 220 performs conduction and interruption operations at high speed and performs power conversion between DC power and AC power. At this time, since a large current is interrupted at a high speed, a large voltage fluctuation occurs due to the inductance of the DC circuit. In order to suppress this voltage fluctuation, the inverter device 220 is provided with the above-described large-capacity smoothing capacitor.

The battery module 9 is composed of a plurality of battery module blocks. In the example shown in FIG. 1, the battery module 9 is composed of two

battery module blocks

9A and 9B connected in series. Each of the battery module blocks 9A and 9B includes a plurality of cell groups in which a plurality of battery cells are connected in series and further connected in series. The battery module block 9A and the battery module block 9B are connected in series via a maintenance / inspection service disconnect SD in which a switch and a fuse are connected in series. When the service disconnect SD is opened, the series circuit of the battery module blocks 9A and 9B is interrupted. Therefore, even if a connection circuit is formed at one location between the battery module blocks 9A and 9B and the vehicle, Will not flow. With such a configuration, high safety can be maintained. Also, by opening the service disconnect SD at the time of inspection, even if an operator touches between HV + and HV−, it is safe because a high voltage is not applied to the human body.

A battery disconnect unit BDU including a relay RL, a resistor RP, and a precharge relay RLP is provided in the high-voltage line HV + between the battery module 9 and the inverter device 220. A series circuit of the resistor RP and the precharge relay RLP is connected in parallel with the relay RL.

The battery monitoring system 100 mainly includes voltage measurement, total voltage measurement, current measurement, cell temperature and cell capacity adjustment, etc., for each cell of the battery module 9 as a monitoring operation for monitoring the state of the battery module 9. I do. For this purpose, the battery monitoring system 100 includes a plurality of battery monitoring devices BM1 to BM4 and a microcomputer 30 for controlling the battery monitoring devices BM1 to BM4. The plurality of battery cells provided in each of the battery module blocks 9A and 9B are divided into a plurality of cell groups. The battery monitoring system 100 is provided with one battery monitoring device BM1 to BM4 for monitoring the battery cells included in each cell group for each cell group. The microcomputer 30 functions as a host controller for the battery monitoring devices BM1 to BM4.

For the sake of simplicity, assume that each cell group is composed of four battery cells connected in series. Each

battery module block

9A, 9B is assumed to be composed of two cell groups. However, the number of battery cells included in each cell group is not limited to four, but may be five or more, or may be three or less. One cell group may be constituted by one battery cell. That is, each of the cell groups constituted by one or a plurality of battery cells connected in series corresponds to a battery to be monitored by the battery monitoring devices BM1 to BM4. In addition, cell groups having different numbers of battery cells, for example, a cell group including four battery cells and a cell group including six battery cells may be combined. The battery monitoring devices BM1 to BM4 provided corresponding to each cell group are used regardless of the number of battery cells included in these cell groups, for example, four or five or more. The one designed to do so can be used.

In addition, as described above, a plurality of cell groups may be connected in series or series-parallel in each battery module block in order to obtain the voltage and current required for electric vehicles and hybrid vehicles. Further, a plurality of battery module blocks may be connected in series or in series and parallel.

The battery monitoring devices BM1 to BM4 each include an antenna for performing wireless communication with the microcomputer 30. The microcomputer 30 is connected to a radio communication unit RF having an antenna. Through this wireless communication unit RF, the microcomputer 30 performs wireless communication with each of the battery monitoring devices BM1 to BM4, and instructs each of the battery monitoring devices BM1 to BM4 to monitor the state of the corresponding cell group. Further, the monitoring result of the state of each cell group transmitted from each of the battery monitoring devices BM1 to BM4 is received.

A wireless signal transmitted from the microcomputer 30 to the battery monitoring devices BM1 to BM4 via the wireless communication unit RF is used to designate which battery monitoring device in the battery monitoring devices BM1 to BM4 is to execute the monitoring operation. ID information and command information for designating the content of the monitoring operation to be performed on the cell group corresponding to the battery monitoring device designated by the ID information are included. The radio communication unit RF generates radio signals by modulating the information output from the microcomputer 30 by a predetermined modulation method, and transmits the radio signals to the battery monitoring devices BM1 to BM4.

In the battery monitoring devices BM1 to BM4, different unique IDs are set in advance at the time of manufacture. When the wireless signal is transmitted from the microcomputer 30, each of the battery monitoring devices BM1 to BM4 compares the ID information included in the wireless signal with the set ID, so that the wireless signal is transmitted to itself. It is judged whether it is a thing.

It should be noted that the battery module 9 and the battery monitoring devices BM1 to BM4 are stored in a predetermined storage location as an assembled battery in a state of being connected to each other before being mounted on the drive system of FIG. In order to manage the battery state at the time of storage, wireless communication is performed between a battery state management device described later and the battery monitoring devices BM1 to BM4. A specific operation at this time will be described later.

A current sensor Si such as a Hall element is installed in the battery disconnect unit BDU. The output of the current sensor Si is input to the microcomputer 30. Signals relating to the total voltage and temperature of the battery module 9 are also input to the microcomputer 30 and are measured by an AD converter (ADC) of the microcomputer 30. The temperature sensor is provided at a plurality of locations in the battery module blocks 9A and 9B.

FIG. 2 is a block diagram showing the configuration of the battery monitoring device BM1 according to the present invention. Although not described, the other battery monitoring devices BM2 to BM4 have the same configuration.

As shown in FIG. 2, the battery monitoring device BM1 includes a receiving unit 31, an authentication circuit 33, a power supply circuit 34, a battery monitoring circuit 35, and a transmitting unit 36.

When receiving the wireless signal transmitted from the microcomputer 30 or the above-described battery state management device, the receiving unit 31 checks whether or not the wireless signal is transmitted to the battery monitoring device BM1. This confirmation can be performed by comparing the ID indicated by the ID information included in the wireless signal with the ID assigned to the battery monitoring device BM1 and determining whether or not they match. . As a result, if both IDs match, it is determined that the received radio signal is transmitted to the battery monitoring device BM1, and the above-mentioned demodulated signal obtained by demodulating the radio signal includes A command based on the command information is output to the battery monitoring circuit 35.

The authentication circuit 33 determines whether or not the communication destination is a valid communication destination in response to an authentication request from the reception unit 31 before starting wireless communication with the microcomputer 30 or the battery state management device. Authentication to do As a result, wireless communication can be started between the battery monitoring device BM1 and the communication destination only when it is determined that the communication destination is a valid communication destination. The authentication result by the authentication circuit 33 is output to the transmission unit 36 and transmitted from the transmission unit 36 to the communication destination.

The power supply circuit 34 supplies power to the authentication circuit 33, the battery monitoring circuit 35, and the transmission unit 36. The power supply from the power supply circuit 34 is performed using the power of the battery cells BC1 to BC4 to which the battery monitoring device BM1 is connected.

The battery monitoring circuit 35 is connected to the battery cells BC1 to BC4 constituting the cell group corresponding to the battery monitoring device BM1, and monitors the state of the battery cells BC1 to BC4 according to a command from the receiving unit 31. The monitoring operation is performed. At this time, the battery monitoring circuit 35 performs the monitoring operation of the content specified by the command output from the receiving unit 31 among the various monitoring operations as described above on the battery cells BC1 to BC4. That is, based on the command information included in the radio signal from the microcomputer 30, the content of the monitoring operation performed by the battery monitoring circuit 35 is determined by outputting a command from the receiving unit 31 to the battery monitoring circuit 35. When the battery monitoring circuit 35 performs a monitoring operation on the battery cells BC1 to BC4, the battery monitoring circuit 35 outputs the result to the transmitting unit 36 as a cell state monitoring result.

The transmitting unit 36 generates a radio signal by modulating the cell state monitoring result output from the battery monitoring circuit 35 by a predetermined modulation method, and transmits the wireless signal to the microcomputer 30 in FIG. The microcomputer 30 can obtain the monitoring results for the battery cells BC1 to BC4 from the battery monitoring device BM1 by receiving the wireless signal transmitted from the transmitting unit 36 via the wireless communication unit RF.

FIG. 3 is a diagram showing an internal block of the battery monitoring circuit 35 in the battery monitoring device BM1. Although not described, the same applies to the battery monitoring circuits 35 of the other battery monitoring devices BM2 to BM4.

The battery module 9 in FIG. 1 is divided into four cell groups corresponding to the battery monitoring devices BM1 to BM4. The cell group GB1 corresponding to the battery monitoring device BM1 includes the four battery cells BC1 to BC4 shown in FIG.

Each input terminal of the battery monitoring circuit 35 is connected to each of the battery cells BC1 to BC4 constituting the cell group GB1. The positive terminal of the battery cell BC1 is connected to the input circuit 116 via the input terminal V1. The input circuit 116 includes a multiplexer. The negative terminal of the battery cell BC1 and the positive terminal of the battery cell BC2 are connected via the input terminal V2. The negative terminal of the battery cell BC2 and the positive terminal of the battery cell BC3 are connected via the input terminal V3 of the battery cell BC3. The positive terminal of the battery cell BC4, which is a negative terminal, is connected to the input circuit 116 via the input terminal V4. The negative terminal of the battery cell BC4 is connected to the terminal GND of the battery monitoring circuit 35.

The voltage detection circuit 122 has a circuit that converts the voltage between the terminals of each of the battery cells BC1 to BC4 into a digital value. Each terminal voltage converted to a digital value is sent to the IC control circuit 123 and held in the internal storage circuit 125. These voltages are used for self-diagnosis or transmitted to the microcomputer 30 shown in FIG.

The IC control circuit 123 has an arithmetic function and also includes a storage circuit 125 and a timing control circuit 252 that periodically detects various voltages and performs state diagnosis. The memory circuit 125 is constituted by a register circuit, for example. The voltages between the terminals of the battery cells BC1 to BC4 detected by the voltage detection circuit 122 are stored in the storage circuit 125 of the IC control circuit 123 in association with the battery cells BC1 to BC4. Further, various other detection values can also be held in the memory circuit 125 so as to be readable at a predetermined address.

A communication circuit 127 is connected to the IC control circuit 123. The IC control circuit 123 receives a command from the microcomputer 30 output by the receiving unit 31 of FIG. 2 via the communication circuit 127 and outputs a cell state monitoring result to the transmitting unit 36 to transmit the transmitting unit 36. To the microcomputer 30. When a command is sent from the receiving unit 31, the IC control circuit 123 decodes the content of the command and performs processing according to the command content. The command from the microcomputer 30 is, for example, a command for requesting a measured value of the inter-terminal voltage of each battery cell BC1 to BC4, a command for requesting a discharge operation for adjusting the charging state of each battery cell BC1 to BC4, battery monitoring A command for starting the operation of the device BM1 (Wake UP), a command for stopping the operation (sleep), a command for requesting address setting, and the like are included.

The positive terminal of the battery cell BC1 is connected to the terminal B1 of the battery monitoring circuit 35 via the resistor R1. A balancing switch 129A is provided between the terminal B1 and the terminal V2. The balancing switch 129A is connected in parallel with an operation state detection circuit 128A for detecting the operation state of the switch. The balancing switch 129A is controlled to be opened and closed by the discharge control circuit 132. Similarly, the positive terminal of the battery cell BC2 is connected to the terminal B2 via the resistor R2, and a balancing switch 129B is provided between the terminal B2 and the terminal V3. The balancing switch 129B is connected in parallel with an operation state detection circuit 128B for detecting the operation state of the switch. The balancing switch 129A is controlled to be opened and closed by the discharge control circuit 132.

The positive terminal of the battery cell BC3 is connected to the terminal B3 via the resistor R3, and a balancing switch 129C is provided between the terminal B3 and the terminal V4. The balancing switch 129C is connected in parallel with an operation state detection circuit 128C for detecting the operation state of the switch. The balancing switch 129C is controlled to open and close by the discharge control circuit 132. The positive terminal of the battery cell BC4 is connected to the terminal B4 via the resistor R4, and a balancing switch 129D is provided between the terminal B4 and the terminal GND. An operation state detection circuit 128D for detecting the operation state of the switch is connected in parallel to the balancing switch 129D. The balancing switch 129D is controlled to be opened and closed by the discharge control circuit 132.

The operation state detection circuits 128A to 128D repeatedly detect the voltages across the balancing switches 129A to 129D at a predetermined period, respectively, and detect whether the balancing switches 129A to 129D are normal. The balancing switches 129A to 129D are switches that adjust the charging states of the battery cells BC1 to BC4. If these switches are abnormal, the state of charge of the battery cells cannot be controlled, and some battery cells may be overcharged or overdischarged. For example, even when a certain balancing switch is in a conductive state, when the voltage between the terminals indicates the terminal voltage of the corresponding battery cell, it is detected that the balancing switch is abnormal. In this case, the balancing switch is not in a conductive state based on the control signal. Further, even when a certain balancing switch is in an open state, when the voltage between the terminals is lower than the terminal voltage of the corresponding battery cell, it is detected that the balancing switch is abnormal. In this case, the balancing switch is conductive regardless of the control signal. As the operation state detection circuits 128A to 128D for detecting the abnormality of the balancing switches 129A to 129D in this way, a voltage detection circuit composed of, for example, a differential amplifier is used.

Balancing switches 129A to 129D are made of, for example, MOS FETs, and act to discharge the electric power stored in the corresponding battery cells BC1 to BC4, respectively. When an electric load such as an inverter is connected to the battery module 9 in which a large number of battery cells are connected in series, the supply of current to the electric load is performed by the entire number of battery cells connected in series. At this time, if each battery cell is in a different state of charge (SOC), the current is limited by the state of the battery cell that is most discharged in the battery module 9. On the other hand, in the state where the battery module 9 is charged, the current is supplied to the battery module 9 with respect to the whole of a large number of battery cells connected in series. At this time, if each battery cell is in a different state of charge (SOC), the current is limited by the state of the battery cell that is most charged in the battery module 9.

Therefore, in order to eliminate the current limitation due to the difference in the charge state of each battery cell as described above, the following balancing is performed as necessary. Specifically, among a large number of battery cells connected in series in the battery module 9, for a battery cell in a predetermined charged state, for example, a charged state exceeding the average value of the charged state of each battery cell, The balancing switch connected to the battery cell is turned on. As a result, a discharge current is caused to flow from the battery cell via a resistor connected in series to the balancing switch in a conductive state. As a result, the state of charge of each battery cell is controlled to approach each other. As another method, there is a method in which the battery cell in the battery module 9 that is in the most discharged state is used as a reference cell, and the discharge time is determined based on the difference in the charged state with the reference cell. In addition, various balancing methods can be used to adjust the state of charge of each battery cell. In addition, the charge state of each battery cell can be calculated | required by calculation based on the terminal voltage of each battery cell. Since there is a correlation between the charge state of each battery cell and the terminal voltage, it is possible to bring the charge state of each battery cell close to each other by controlling the balancing switches 129A to 129D so that the terminal voltage of each battery cell is close to each other. it can.

The voltage between the terminals of the balancing switches 129A to 129D, that is, the voltage between the source and drain of each FET constituting the balancing switches 129A to 129D is detected by the operation state detection circuits 128A to 128D and output to the potential conversion circuit 130. Here, since the potential between the source and drain of each FET is different from the reference potential, it is difficult to make a comparative determination as it is. Therefore, the potential conversion circuit 130 matches these potentials, and then the abnormality determination circuit 131 determines abnormality. The potential conversion circuit 130 also has a function of selecting a balancing switch to be diagnosed among the balancing switches 129A to 129D based on a control signal from the IC control circuit 123. When the voltage between the terminals of the selected balancing switch is sent from the potential conversion circuit 130 to the abnormality determination circuit 131, the abnormality determination circuit 131 compares the voltage between the terminals with a predetermined determination voltage based on the control signal from the IC control circuit 123. To do. Thereby, the abnormality determination circuit 131 can determine whether or not the balancing switches 129A to 129D are abnormal.

The discharge control circuit 132 is supplied with a command signal for making the balancing switch corresponding to the battery cell to be discharged from the IC control circuit 123 conductive. Based on this command signal, the discharge control circuit 132 outputs a signal corresponding to the gate voltage for conducting the balancing switches 129A to 129D composed of MOS type FETs as described above.

The IC control circuit 123 receives a discharge time command corresponding to the battery cell in response to a command from the microcomputer 30 shown in FIG. 1, and executes the discharge operation as described above. Further, when detecting an abnormality in the balancing switches 129A to 129D, the IC control circuit 123 outputs the detection result to the transmission unit 36 as the cell state monitoring result shown in FIG. To do.

Next, the management of the battery state during storage will be described. FIG. 4 is a diagram showing a schematic configuration of the battery state management system according to the present embodiment. This battery state management system includes an assembled battery AB1 that is mounted on the drive system of FIG.

The assembled battery AB1 is configured by connecting the battery module 9 and the battery monitoring devices BM1 to BM4 to each other. This assembled battery AB1 is stored in a predetermined storage location such as a warehouse in a transportation facility such as a factory or a ship, a distribution base, or the like. Unique ID_A1 to ID_D1 are set in advance in each of the battery monitoring devices BM1 to BM4.

In addition, many assembled batteries other than the assembled battery AB1 are stored together in the above-mentioned storage location, but FIG. 4 shows the assembled battery AB1 as a representative example. Other assembled batteries also have the same configuration as the assembled battery AB1.

The battery state management device 40 is a device for managing the state of the battery module 9 stored as the assembled battery AB1 in the storage location, and wirelessly communicates with each battery monitoring device of the assembled battery to be managed. I do. A unique ID_CB is set in advance in the battery state management device 40. The assembled battery to be managed by the battery state management device 40 is determined by the unique ID stored in the battery state management device 40. In the example shown in FIG. 4, the unique ID_Ax to ID_Dx of each battery monitoring device included in each of N assembled batteries ABx (x = 1 to N) is stored in the battery state management device 40. A method for storing these unique IDs in the battery state management device 40 will be described later.

The battery state management device 40 also stores a key generation table that is table information for generating key information for authentication. When starting wireless communication with each of the battery monitoring devices BM1 to BM4 of the battery pack AB1 to be managed, the battery state management device 40 generates key information by referring to the key generation table, and the key Information is transmitted to each of the battery monitoring devices BM1 to BM4. Then, in each of the battery monitoring devices BM1 to BM4, authentication is performed by the authentication circuit 33 (see FIG. 2) based on the key information received from the battery state management device 40, so that the battery state management device 40 is a valid communication destination. It is determined whether or not there is. As a result, when it is determined that the communication destination is valid, wireless communication is started between the battery state management device 40 and each of the battery monitoring devices BM1 to BM4.

The battery state management device 40 as described above is configured, for example, by connecting a personal computer and a wireless device by USB or the like. That is, a battery state management device is configured by controlling a wireless device by executing a predetermined program on a personal computer and causing the wireless device to perform wireless communication with each battery monitoring device of an assembled battery to be managed. 40 is realized.

The battery state management method by the battery state management system described above will be described with reference to FIG. In the assembled battery AB1, for example, at the time of shipping inspection from the factory, the unique ID_A1 to ID_D1 of the battery monitoring devices BM1 to BM4 are read by the shipping inspection device 50, and information related to these unique IDs is taken up by the shipping inspection device 50. . Information of the unique ID_A1 to ID_D1 sucked up by the shipping inspection device 50 is registered in the inspection result file server 60.

The information of the unique ID_A1 to ID_D1 registered in the inspection result file server 60 is read by the battery state management device 40 in advance when managing the state of the battery module 9 with the assembled battery AB1 as a management target, and the battery state management Stored in device 40. Similarly, when the battery status is managed for the assembled batteries AB1 to AB6 in the packed state stored in the warehouse, the unique IDs of the battery monitoring devices included in these are preliminarily obtained from the inspection result file server 60 in advance. And stored in the battery state management device 40. In this way, the battery state management device 40 stores the unique IDs of the battery monitoring devices included in the battery packs AB1 to AB6 to be managed in the battery state management device 40, so that the battery state management device 40 can store the battery packs AB1 to AB6. The wireless communication can be performed between these and the state management.

Subsequently, a battery state management processing procedure in the battery state management system of the present embodiment will be described. FIG. 6 is a flowchart showing a processing procedure of the battery state management device 40, and FIG. 7 is a flowchart showing a processing procedure of the battery monitoring device BM1 when the assembled battery AB1 is a management target. In the following, a processing procedure when the assembled battery AB1 is a management target will be described as an example, but the same applies to a case where another assembled battery is a management target. The processing procedure of the battery monitoring device BM1 among the battery monitoring devices BM1 to BM4 of the assembled battery AB1 will be described as an example, but the same applies to the other battery monitoring devices BM2 to BM4.

6, the battery state management device 40 acquires a list of unique IDs registered in the inspection result file server 60. When the unique IDs_A1 to ID_D1 for the battery monitoring devices BM1 to BM4 included in the battery pack AB1 to be managed are selected from the list of unique IDs acquired in this way, the information is read from the inspection result file server 60, and the battery state It is stored in the management device 40.

In step S20, the battery state management device 40 performs a predetermined authentication process with each of the battery monitoring devices BM1 to BM4 of the assembled battery AB1 to be managed. By performing the authentication process here, it is determined in each of the battery monitoring devices BM1 to BM4 whether or not the battery state management device 40 is a valid communication destination, and the result of the determination is the battery monitoring as the authentication result. The data is transmitted from the devices BM1 to BM4 to the battery state management device 40. The specific procedure of the authentication process will be described later with reference to FIG.

In step S30, the battery state management device 40 determines whether or not the authentication is OK based on the authentication result transmitted from each of the battery monitoring devices BM1 to BM4. If authentication is OK, that is, if it is determined that the battery state management device 40 is a valid communication destination in all of the battery monitoring devices BM1 to BM4, the process proceeds to step S40. On the other hand, when the authentication is not OK, that is, when it is determined that at least one of the battery monitoring devices BM1 to BM4 is not a valid communication destination, the processing shown in the flowchart of FIG. .

In step S40, the battery state management device 40 acquires the cell voltage and temperature measurement results in each battery cell of the cell group to which each of the battery monitoring devices BM1 to BM4 is connected. At this time, the battery state management device 40 receives the cell voltage and temperature measurement results transmitted as cell state monitoring results from each of the battery monitoring devices BM1 to BM4 by the process of step S250 in FIG. As a result, the cell voltage and temperature measurement results in each battery cell of each cell group connected to the battery monitoring devices BM1 to BM4 are acquired.

In step S50, the battery state management device 40 has an abnormal state of each battery cell in the cell group to which the battery monitoring devices BM1 to BM4 are connected based on the cell voltage and temperature measurement results obtained in step S40. It is determined whether or not. This determination can be made, for example, based on whether or not the measured cell voltage and temperature are within a predetermined range set in advance. That is, if the cell voltage or temperature is within a predetermined range, it is determined to be normal, and if it is outside the range, it is determined to be abnormal. In addition, you may determine whether the state of a battery cell is abnormal using determination methods other than this. If all the battery cells of the battery monitoring devices BM1 to BM4 are not abnormal, the process proceeds to step S60, and if any one of the battery cells is abnormal, the process proceeds to step S150.

In step S60, the battery state management device 40 determines whether balancing is required for each of the battery monitoring devices BM1 to BM4 based on the measurement result of the cell voltage acquired in step S40. This determination can be made, for example, by estimating the state of charge of each battery cell based on each cell voltage of the measured cell group, and whether or not there is a battery that satisfies the balancing condition as described above. it can. If it is determined that balancing is not necessary for all of the battery monitoring devices BM1 to BM4, the process shown in the flowchart of FIG. 6 is terminated, and if it is determined that balancing is required for at least one of the battery monitoring devices, a step is performed. Proceed to S70.

In step S70, the battery state management device 40 makes the balancing target among the battery cells of the cell group to which the battery monitoring device is connected with respect to the battery monitoring device determined to be balanced in step S60. A battery cell (adjustment cell) is determined, and a target voltage of the adjustment cell is determined. These determinations can be made based on the cell voltage measurement results of the cell group corresponding to the battery monitoring device among the cell voltage measurement results acquired in step S40.

In step S80, the battery state management device 40 transmits a discharge request command corresponding to the adjusted cell determined in step S70 and the target voltage to the battery monitoring device determined to be balanced in step S60. This instructs the battery monitoring device to discharge the adjustment cell until the cell voltage of the adjustment cell in the corresponding cell group reaches the target voltage.

In step S90, the battery state management device 40 initializes an internal timer and starts time measurement using the timer.

In step S100, the battery state management device 40 acquires the cell voltage and temperature measurement results in each battery cell of the corresponding cell group from the battery monitoring device that transmitted the discharge request command in step S80. At this time, the battery state management device 40 receives the cell voltage and temperature measurement results transmitted as cell state monitoring results from the battery monitoring device by the process of step S290 in FIG. 7 described later. Thereby, the measurement result of the cell voltage and temperature in each battery cell of the cell group connected to the battery monitoring device is acquired.

In step S110, the battery state management device 40 determines whether or not the state of each battery cell in the cell group to which the battery monitoring device is connected is abnormal based on the measurement result of the cell voltage and temperature acquired in step S100. Determine whether. This determination can be performed by the same determination method as in step S50 described above. When all the battery cells of the battery monitoring apparatus are not abnormal, the process proceeds to step S120, and when any one of the battery cells is abnormal, the process proceeds to step S140.

In step S120, the battery state management device 40 determines whether balancing has been completed in the battery monitoring device that has transmitted the discharge request command in step S80. This determination can be made based on whether or not a balancing completion report has been transmitted from the battery monitoring apparatus in the process of step S340 in FIG. That is, when a balancing completion report is transmitted from the battery monitoring apparatus, it is determined that balancing is complete, and the process shown in the flowchart of FIG. 6 is terminated. When the balancing completion report is not transmitted, the process proceeds to step S130.

In step S130, the battery state management device 40 determines whether or not a predetermined time-out time set in advance by a timer is measured. If the measurement time by the timer is less than the timeout time, the process returns to step S100, and the processes of steps S100 to S130 described above are continued. On the other hand, if it is longer than the timeout time, the process returns to step S70. In this case, the adjustment cell and the target voltage are determined again based on the measurement result of the cell voltage and temperature acquired in step S100 executed immediately before, and a discharge request command corresponding to the result is retransmitted to the battery monitoring device. Send.

In step S140, the battery state management device 40 stops discharging to stop balancing for the battery monitoring device that has determined that the state of the battery cell is abnormal in step S110 after transmitting the discharge request command in step S80. Send a command. As a result, an instruction is issued to stop the discharge of the adjustment cell to the battery monitoring device that is determined to have an abnormality in the state of the battery cell during balancing.

In step S150, the battery state management device 40 issues a warning for notifying the operator of the battery state management device 40 of the abnormality of the battery monitoring device determined to be abnormal in step S50 or S1100. . This warning is performed by, for example, displaying a predetermined warning message on the screen of the battery state management device 40 or outputting a voice.

In step S160, the battery state management device 40 records an abnormality result corresponding to the warning made in step S150.

If step S160 is performed, the battery state management apparatus 40 will complete | finish the process shown to the flowchart of FIG.

7, the battery monitoring device BM1 performs predetermined authentication processing with the battery state management device 40 using the reception unit 31, the authentication circuit 33, and the transmission unit 36. This authentication process corresponds to that performed by the battery state management device 40 in step S20 of FIG. 6 described above, and the specific procedure will be described later with reference to FIG.

In step S220, the battery monitoring apparatus BM1 transmits the result of the authentication process performed in step S210 to the battery state management apparatus 40 using the reception unit 31, the authentication circuit 33, and the transmission unit 36.

In step S230, the battery monitoring apparatus BM1 determines whether or not the result of the authentication process performed in step S210 is OK by the authentication circuit 33. If the authentication is OK, that is, if it is determined in the authentication process that the battery state management device 40 is a valid communication destination, the process proceeds to step S240. On the other hand, if the authentication is not OK, that is, if the battery state management device 40 determines that the communication destination is not a valid communication destination in the authentication process, the process shown in the flowchart of FIG. 7 ends.

In step S240, the battery monitoring device BM1 uses the battery monitoring circuit 35 to measure the cell voltage and temperature in each battery cell of the connected cell group.

In step S250, the battery monitoring device BM1 outputs the cell voltage and temperature measured in step S240 as cell state monitoring results from the battery monitoring circuit 35 to the transmission unit 36, and these monitoring results are transmitted by the transmission unit 36 to the battery state management device. 40. As a result, the cell voltage and temperature measurement results in each battery cell of the cell group to which the battery monitoring device BM1 is connected are transmitted from the battery monitoring device BM1 to the battery state management device 40 as the cell state monitoring result for each battery cell. Is done.

In step S260, the battery monitoring device BM1 determines whether the receiving unit 31 has received the discharge request command transmitted from the battery state management device 40 in step S80 of FIG. If a discharge request command for the battery monitoring device BM1 is received from the battery state management device 40, the process proceeds to step S270, and if not received, the process shown in the flowchart of FIG.

In step S270, the battery monitoring device BM1 controls the opening and closing of the balancing switches 129A to 129D in FIG. 3 in accordance with the discharge request command received from the battery state management device 40. Here, when the discharge request command is received by the reception unit 31, the discharge request command is output from the reception unit 31 to the battery monitoring circuit 35. The battery monitoring circuit 35 controls the discharge control circuit 132 to close the balancing switch corresponding to the adjustment cell specified by the discharge request command among the balancing switches 129A to 129D.

In step S280, the battery monitoring device BM1 measures the cell voltage and temperature in each battery cell of the connected cell group using the battery monitoring circuit 35, as in step S240.

In step S290, the battery monitoring device BM1 outputs the cell voltage and temperature measured in step S280 as cell state monitoring results from the battery monitoring circuit 35 to the transmission unit 36, and these monitoring results are transmitted by the transmission unit 36 to the battery state management device. 40. As a result, as in step S250, the cell voltage and temperature measurement results in each battery cell of the cell group to which the battery monitoring device BM1 is connected are transferred from the battery monitoring device BM1 as the cell state monitoring result for each battery cell. It is transmitted to the state management device 40.

In step S300, the battery monitoring device BM1 determines whether the receiving unit 31 has received the discharge stop command transmitted from the battery state management device 40 in step S140 of FIG. If a discharge stop command for the battery monitoring device BM1 is received from the battery state management device 40, the process proceeds to step S330, and if not received, the process proceeds to step S310.

In step S310, the battery monitoring device BM1 compares the target voltage of the adjustment cell specified by the discharge request command received from the battery state management device 40 with the cell voltage measured in step S280 by the battery monitoring circuit 35. Based on the comparison result, it is determined whether or not the cell voltage of the adjustment cell has reached the target voltage. If the difference between the target voltage of the adjustment cell and the cell voltage is less than the predetermined value, it is determined that the target voltage has been reached, and the process proceeds to step S340. If the difference is greater than the predetermined value, it is determined that the target voltage has not been reached. Proceed to S320.

In step S320, the battery monitoring device BM1 determines whether or not the receiving unit 31 has re-received the discharge request command from the battery state management device 40. Since the battery state management device 40 re-transmits the discharge request command to the battery monitoring device BM1 by executing the process of step S80 in FIG. 6 again, the process returns to step S270. In this case, in step S270, the switching control of the balancing switches 129A to 129D is performed again according to the re-received discharge request command. On the other hand, if the discharge request command has not been received again, the process returns to step S280, and the processes of steps S280 to S320 described above are continued.

In step S330, the battery monitoring device BM1 stops the discharge of the adjustment cell in response to the discharge stop command received from the battery state management device 40. Here, when a discharge stop command is received by the receiving unit 31, the discharge stop command is output from the receiving unit 31 to the battery monitoring circuit 35. The battery monitoring circuit 35 controls the discharge control circuit 132 to open all the balancing switches 129A to 129D including the balancing switch corresponding to the adjustment cell.

When step S330 is executed, the battery monitoring device BM1 ends the process shown in the flowchart of FIG.

In step S340, the battery monitoring device BM1 outputs a report indicating that balancing has been completed after the discharge of the adjustment cell from the battery monitoring circuit 35 to the transmission unit 36, and this is transmitted to the battery state management device 40 by the transmission unit 36. To do.

When step S340 is executed, the battery monitoring device BM1 ends the process shown in the flowchart of FIG.

Here, an authentication process performed between the battery state management device 40 and the battery monitoring device BM1 will be described. As described above, the battery state management device 40 performs authentication processing in step S20 of FIG. 6, and the battery monitoring device BM1 performs authentication processing in step S210 of FIG. FIG. 8 is a diagram showing an example of the procedure of this authentication process. Hereinafter, the battery monitoring device BM1 will be described as an example of the battery monitoring devices BM1 to BM4 of the assembled battery AB1, but the same applies to the other battery monitoring devices BM2 to BM4.

When the authentication process is started, first, the battery state management device 40 requests the battery monitoring device BM1 for a seed for generating key information for authentication. The seed request transmitted from the battery state management device 40 is received by the reception unit 31 in the battery monitoring device BM1 and output to the authentication circuit 33. Then, in response to this request, the seed is output from the authentication circuit 33 to the transmission unit 36 and transmitted by the transmission unit 36, whereby the seed is returned from the battery monitoring device BM 1 to the battery state management device 40. The seed is identification information uniquely assigned to each individual battery monitoring device, and for example, a unique ID can be used.

When the seed is returned from the battery monitoring device BM1, the battery state management device 40 refers to the above-described key generation table based on the seed, and acquires key information corresponding to the seed. Then, the acquired key information is transmitted to the battery monitoring device BM1.

Note that information other than the key generation table, for example, information on a predetermined algorithm or function, may be stored in the battery state management device 40, and key information may be generated based on the information. As long as the key information corresponding to the seed can be generated, the battery state management device 40 may use any information.

The key information transmitted from the battery state management device 40 is received by the reception unit 31 in the battery monitoring device BM1 and output to the authentication circuit 33. The authentication circuit 33 confirms whether or not this key information corresponds to the seed returned to the battery state management device 40, thereby determining whether or not the battery state management device 40 is a valid communication destination. Determine. When the determination is completed, the determination result is output from the authentication circuit 33 to the transmission unit 36 and transmitted to the battery state management device 40, so that the battery monitoring device BM1 returns a response indicating whether or not authentication is possible. . Note that this reply indicating whether authentication is possible corresponds to the processing in step S220 in FIG.

When the battery monitoring device BM1 returns the authentication permission / inhibition, the battery state management device 40 performs the determination in step S30 of FIG. 6 based on the content. As a result, when the authentication is possible, the battery state management operation is started by executing the processing after step S40.

According to the embodiment of the present invention described above, the following operational effects are obtained.

(1) The battery monitoring device BM1 includes an authentication circuit 33 that performs authentication for determining whether or not the battery state management device 40 is a valid communication destination. When it is determined by the authentication process (step S210) performed by the authentication circuit 33 that the battery state management device 40 is a valid communication destination, the battery monitoring device BM1 includes the cell group connected in the battery module 9. The monitoring result is wirelessly transmitted to the battery state management device 40 (steps S250 and S290). The battery state management device 40 determines whether or not there is an abnormality in the battery monitoring device BM1 based on the monitoring result wirelessly transmitted from the battery monitoring device BM1 (steps S50 and S110), and when the balancing is necessary, the battery monitoring device By transmitting a discharge request command to BM1 (step S80), the state of the battery module 9 is managed in the assembled battery AB1. Since it did in this way, a battery state can be managed appropriately in the stage before incorporating in a vehicle etc.

(2) In the authentication process in step S20, the battery state management device 40 requests the battery monitoring device BM1 for a seed that is unique identification information for each individual battery monitoring device. Based on the seed transmitted from the battery monitoring device BM1 in response to this request and the key generation table stored in advance, the battery state management device 40 generates key information for use in authentication to generate the battery monitoring device BM1. Send to. In the battery monitoring device BM1, the authentication circuit 33 performs authentication based on the key information transmitted from the battery state management device 40. Since it did in this way, authentication whether the battery state management apparatus 40 is a valid communication destination can be reliably performed in the authentication circuit 33 of the battery monitoring apparatus BM1.

(3) The battery monitoring device BM1 measures the cell voltage of each battery cell of the connected cell group (steps S240 and S280), and wirelessly transmits the measurement result to the battery state management device 40 as the monitoring result of the cell group. Transmit (steps S250 and S290). The battery state management device 40 transmits a discharge request command based on the measurement result of the cell voltage wirelessly transmitted from the battery monitoring device BM1 (step S80), determines whether there is an abnormality, and discharges if there is an abnormality. An operation for managing the state of the battery module 9 is instructed to the battery monitoring device BM1 by transmitting a stop command (steps S110 and S140). Thereby, an appropriate operation instruction according to the state of the battery module 9 can be given to the battery monitoring device BM1.

(4) The battery state management device 40 determines whether or not each battery cell in the cell group is to be an adjustment cell to be balanced based on the measurement result of the cell voltage wirelessly transmitted from the battery monitoring device BM1. At the same time, the target voltage of the battery cell to be balanced is determined (step S70). Then, by transmitting a discharge request command corresponding to these in step S80, the battery monitoring device BM1 is instructed to discharge the battery cell until the voltage of the adjustment cell targeted for balancing reaches the target voltage. . Since it did in this way, when dispersion | variation arises in the charging state of each battery cell during storage, the dispersion | variation can be eliminated.

(5) After starting the balancing, the battery monitoring device BM1 measures the temperature of each battery cell of the connected cell group (step S280), and uses the measurement result as the monitoring result of the cell group to the battery state management device 40. Wireless transmission is performed (step S290). When the battery state management device 40 determines whether or not the state of the battery module 9 is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device BM1 (step S110), Is sent to the battery monitoring device BM1 (step S140), thereby instructing the battery monitoring device BM1 to stop discharging the battery cells targeted for balancing. In this way, since discharge is stopped when an abnormality occurs during balancing, the occurrence of an accident or the like can be prevented in advance.

(6) The battery monitoring device BM1 measures the temperature of each battery cell of the connected cell group (steps S240 and S280), and wirelessly transmits the measurement result to the battery state management device 40 as the monitoring result of the cell group. (Steps S250 and S290). The battery state management device 40 determines whether or not the state of the battery module 9 is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device BM1 (steps S50 and S110), and determines that it is abnormal. If this occurs, a warning is given (step S150). Since it did in this way, when abnormality generate | occur | produces, it can notify to the operator of the battery state management apparatus 40 immediately.

In the embodiment described above, the battery state management device 40 determines whether there is an abnormality during balancing by executing the process of step S110 of FIG. 6, but this is performed in the battery monitoring device BM1. You may do it. In that case, the battery monitoring apparatus BM1 executes the process of step S110 instead of step S300 of FIG. 7 and transmits the discharge stop report to the battery state management apparatus 40 after executing the process of step S330. It is preferable. Note that the process of step S290 may be omitted. On the other hand, it is preferable that the battery state management device 40 omits the processes of steps S100 and S140, and in step S110, determines whether or not there is an abnormality depending on whether or not a discharge stop report is transmitted from the battery monitoring device BM1.

The embodiments and various modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

The disclosure of the following priority application is hereby incorporated by reference.
Japanese Patent Application No. 2011-223167 (filed on Oct. 7, 2011)

Claims

A battery state management device for managing a state of a battery configured by connecting one or a plurality of battery cell groups each configured by one or a plurality of battery cells connected in series,
The battery cell group is connected to a battery monitoring device configured to monitor the state of the battery for each of the battery cell groups and wirelessly transmit a monitoring result to the battery state management device,
The battery monitoring device includes an authentication circuit that performs authentication for determining whether or not the battery state management device is a valid communication destination,
When the authentication circuit determines that the battery state management device is a valid communication destination, the battery monitoring device wirelessly transmits a monitoring result of the connected battery cell group to the battery state management device,
The battery state management device is a battery state management device that manages the state of the battery based on the monitoring result wirelessly transmitted from the battery monitoring device.
The battery state management device according to claim 1,
Requesting the battery monitoring device for specific identification information for each individual battery monitoring device,
A battery that generates key information for use in the authentication and transmits it to the battery monitoring apparatus based on the identification information transmitted from the battery monitoring apparatus in response to the request and key generation information stored in advance. State management device.
The battery state management device according to claim 1 or 2,
The battery monitoring device wirelessly transmits a voltage measurement result of each battery cell of a connected battery cell group to the battery state management device as the monitoring result,
The battery state management device instructs the battery monitoring device to perform an operation for managing the state of the battery based on the voltage measurement result wirelessly transmitted from the battery monitoring device.
In the battery state management device according to claim 3,
Based on the voltage measurement result wirelessly transmitted from the battery monitoring device, each of the battery cells to determine whether to be a balancing target, determine the target voltage of the battery cell to be balanced,
A battery state management device that instructs the battery monitoring device to discharge the battery cell until the voltage of the battery cell targeted for balancing reaches the target voltage.
In the battery state management device according to claim 4,
The battery monitoring device wirelessly transmits the temperature measurement result of the connected battery cell group to the battery state management device as the monitoring result,
The battery state management device determines whether or not the state of the battery is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device, and determines that the battery state is abnormal. A battery state management device that instructs the device to stop discharging of the battery cells targeted for balancing.
In the battery state management device according to any one of claims 1 to 5,
The battery monitoring device wirelessly transmits a temperature measurement result of a connected battery cell group as the monitoring result to the battery state management device,
The battery state management device determines whether or not the state of the battery is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device, and issues a warning when determining that the state is abnormal Battery state management device.
Battery state management using a battery state management device for managing the state of a battery formed by connecting one or a plurality of battery cell groups each constituted by one or a plurality of battery cells connected in series A method,
The battery cell group is connected to a battery monitoring device configured to monitor the state of the battery for each of the battery cell groups and wirelessly transmit a monitoring result to the battery state management device,
The battery monitoring device performs authentication to determine whether the battery state management device is a valid communication destination,
When it is determined by the authentication that the battery status management device is a valid communication destination, the monitoring result of the battery cell group to which the battery monitoring device is connected is wirelessly transmitted from the battery monitoring device to the battery status management device. And
A battery state management method for managing a state of the battery based on the monitoring result wirelessly transmitted from the battery monitoring device by the battery state management device.
The battery state management method according to claim 7,
Transmitting identification information unique to each individual battery monitoring device from the battery monitoring device to the battery status management device,
The battery state management device generates key information for use in the authentication based on the identification information transmitted from the battery monitoring device and key generation information stored in advance.
Transmitting the key information from the battery state management device to the battery monitoring device;
A battery state management method for performing the authentication based on the key information transmitted from the battery state management apparatus by the battery monitoring apparatus.
The battery state management method according to claim 7 or 8,
Wirelessly transmitting the voltage measurement result of each battery cell of the battery cell group to which the battery monitoring device is connected as the monitoring result from the battery monitoring device to the battery state management device;
A battery state management method for instructing the battery monitoring device to perform an operation for managing the state of the battery based on the voltage measurement result wirelessly transmitted from the battery monitoring device by the battery state management device.
The battery state management method according to claim 9,
Based on the voltage measurement result wirelessly transmitted from the battery monitoring device, the battery state management device determines whether or not each of the battery cells is a balancing target, and the target of the battery cell as a balancing target Determine the voltage,
The battery status management device instructs the battery monitoring device to discharge the battery cell until the voltage of the battery cell targeted for balancing reaches the target voltage,
A battery state management method in which the battery monitoring device discharges the battery cell until the voltage of the balancing target battery cell reaches the target voltage in accordance with the instruction.
The battery state management method according to claim 10,
The wireless monitoring device transmits the temperature measurement result of the battery cell group to which the battery monitoring device is connected as the monitoring result from the battery monitoring device to the battery state management device,
The battery state management device determines whether or not the state of the battery is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device, and the battery monitoring when it is determined that the battery state is abnormal A battery state management method for instructing an apparatus to stop discharging of a battery cell targeted for balancing.
The battery state management method according to any one of claims 7 to 11,
The temperature measurement result of the battery cell group to which the battery monitoring device is connected is wirelessly transmitted as the monitoring result from the battery monitoring device to the battery state management device,
The battery state management device determines whether or not the battery state is abnormal based on the temperature measurement result wirelessly transmitted from the battery monitoring device, and issues a warning when it is determined that the battery state is abnormal Battery state management method.