JP6947322B1 - Battery management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery management system capable of suppressing loss of data including battery information. A monitoring device includes a monitoring IC 33 for acquiring battery information and a wireless IC 35. The control device 40 performs wireless communication with the wireless IC 35. The control device 40 transmits request data requesting transmission of battery information, and when the monitoring device 30 receives the request data, it transmits response data including battery information to the control device 40. The control device 40 transmits the next request data including the communication establishment information of the response data to the request data. The wireless IC 35 includes a transmission buffer 350 capable of individually storing battery information for a plurality of times, and transmits one battery information in the transmission buffer 350 for one request data. The wireless IC 35 deletes the battery information corresponding to the case where the communication is established from the transmission buffer 350, and holds the battery information in the transmission buffer 350 when the communication is not established. [Selection diagram] Fig. 4

Description

The disclosure herein relates to a battery management system.

Patent Document 1 discloses a battery management system. The contents of the prior art document are incorporated by reference as an explanation of the technical elements in this specification.

Japanese Patent No. 6093448

According to Patent Document 1, when the assembled battery management device continuously detects a communication error with respect to the first battery cell management device, it determines that wireless communication with the first battery management cell device is impossible. Then, the assembled battery management device performs wireless communication with the first battery cell management device via a second battery cell management device different from the first battery cell device. As described above, with the occurrence of a communication failure between the battery cell management device (monitoring device) and the assembled battery management device (control device), data including battery information is lost (missing). Further improvements are required in the battery management system in the above-mentioned viewpoint or in other viewpoints not mentioned.

One object disclosed is to provide a battery management system capable of suppressing the loss of data including battery information.

The battery management system disclosed here is
A monitoring device having a monitoring unit (33) that acquires and monitors battery information indicating the battery status, and a wireless circuit unit (35) that can transmit and receive data between the monitoring unit and execute wireless communication. 30) and
A control device (40) that performs wireless communication with a wireless circuit unit and executes a predetermined process based on battery information is provided.
The control device transmits request data requesting the monitoring device to transmit battery information, and when the monitoring device receives the request data, the control device transmits response data including battery information to the control device.
The control device transmits the next request data including communication establishment information that can distinguish between the communication establishment in which the response data is normally received and the communication failure in which the response data is not received normally. death,
The request data includes a periodic signal transmitted at a predetermined period.
The wireless circuit unit includes a transmission buffer (350) capable of individually storing battery information for a plurality of times acquired by the monitoring unit, and uses the battery information for one time in the transmission buffer as a control device for one request data. It transmits, and based on the communication establishment information, the battery information corresponding to the case of communication establishment is deleted from the transmission buffer, and the battery information is held in the transmission buffer when communication is not established.

In the disclosed battery management system, the wireless circuit section of the monitoring device includes a transmission buffer. Therefore, the battery information for a plurality of times can be stored in the transmission buffer. The battery information stored in the transmission buffer is deleted when communication with the control device is established, and is retained in the transmission buffer without being deleted when communication with the control device is not established. As a result, it is possible to suppress the loss of data including battery information.

The disclosed aspects herein employ different technical means to achieve their respective objectives. The claims and the reference numerals in parentheses described in this section exemplify the correspondence with the parts of the embodiments described later, and are not intended to limit the technical scope. The objectives, features, and effects disclosed herein will be made clearer by reference to the subsequent detailed description and accompanying drawings.

It is a figure which shows the vehicle provided with the battery pack. It is a perspective view which shows the schematic structure of the battery pack. It is a top view which shows the assembled battery. It is a block diagram which shows the structure of the battery management system which concerns on 1st Embodiment. It is a figure which shows the sequence of request and response of battery information. It is a timing chart which shows an example of a request and a response. It is a timing chart which shows another example of a request and a response. It is a figure which shows an example of the request response sequence of the battery information in the battery management system which concerns on 2nd Embodiment. It is a timing chart which shows an example of a request and a response. It is a timing chart which shows another example of a request and a response. It is a figure which shows the data deletion executed by the wireless IC in the battery management system which concerns on 3rd Embodiment. It is a figure which shows another example of data deletion executed by a wireless IC. It is a block diagram which shows the other configuration example of a battery management system.

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, duplicate description may be omitted by assigning the same reference numerals to the corresponding components in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other parts of the configuration. Further, not only the combination of the configurations specified in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if the combination is not specified. ..

(First Embodiment)
First, based on FIG. 1, a vehicle equipped with the battery management system according to the present embodiment, particularly, a configuration around a battery pack provided with the battery management system will be described. FIG. 1 is a diagram showing a schematic configuration of a vehicle. The vehicle is an electric vehicle such as an electric vehicle or a hybrid vehicle.

<Vehicle>
As shown in FIG. 1, the vehicle 10 includes a battery pack (BAT) 11, a PCU 12, an MG 13, and an ECU 14. PCU is an abbreviation for Power Control Unit. MG is an abbreviation for Motor Generator. ECU is an abbreviation for Electronic Control Unit.

The battery pack 11 includes an assembled battery 20, which will be described later, and provides a DC voltage source that can be charged and discharged. The battery pack 11 supplies electric power to the electric load of the vehicle 10. The battery pack 11 supplies power to the MG 13 through the PCU 12. The battery pack 11 is charged through the PCU 12. The battery pack 11 is sometimes referred to as a main battery.

The battery pack 11 is located in the front compartment of the vehicle 10, for example, as shown in FIG. The battery pack 11 may be located in the rear compartment, under the seat, under the floor, and the like. For example, in the case of a hybrid vehicle, the compartment in which the engine is located is sometimes referred to as an engine compartment or an engine room.

The PCU 12 executes bidirectional power conversion between the battery pack 11 and the MG 13 according to the control signal from the ECU 14. The PCU 12 is sometimes referred to as a power converter. The PCU 12 includes, for example, an inverter. The inverter converts the DC voltage into an AC voltage, for example, a three-phase AC voltage, and outputs the DC voltage to the MG 13. The inverter converts the generated power of the MG 13 into a DC voltage and outputs it to the converter. The PCU 12 may include a converter. The converter is arranged in the energization path between the battery pack 11 and the inverter. The converter has a function of raising and lowering the DC voltage.

The MG 13 is an AC rotating electric machine, for example, a three-phase AC synchronous motor in which a permanent magnet is embedded in a rotor. The MG 13 functions as a traveling drive source for the vehicle 10, that is, an electric motor. The MG 13 is driven by the PCU 12 to generate a rotational driving force. The driving force generated by the MG 13 is transmitted to the driving wheels. The MG 13 functions as a generator when the vehicle 10 is braked, and performs regenerative power generation. The generated power of the MG 13 is supplied to the battery pack 11 through the PCU 12 and stored in the assembled battery 20 in the battery pack 11.

The ECU 14 includes a computer including a processor, a memory, an input / output interface, a bus connecting them, and the like. A processor is hardware for arithmetic processing. The processor includes, for example, a CPU as a core. CPU is an abbreviation for Central Processing Unit. A memory is a non-transitional substantive storage medium that non-temporarily stores or stores programs and data that can be read by a computer. The memory stores various programs executed by the processor.

The ECU 14 acquires information about the assembled battery 20 from the battery pack 11, for example, and controls the PCU 12 to control the drive of the MG 13 and the charging / discharging of the battery pack 11. The ECU 14 may acquire information such as voltage, temperature, current, SOC, and SOH of the assembled battery 20 from the battery pack 11. The ECU 14 may acquire battery information such as voltage, temperature, and current of the assembled battery 20 to calculate SOC and SOH. SOC is an abbreviation for State Of Charge. SOH is an abbreviation for State Of Health.

The processor of the ECU 14 executes a plurality of instructions included in, for example, a PCU control program stored in a memory. As a result, the ECU 14 constructs a plurality of functional units for controlling the PCU 12. In the ECU 14, a plurality of functional units are constructed by causing a processor to execute a plurality of instructions by a program stored in a memory. The ECU 14 may be referred to as an EV ECU.

<Battery pack>
Next, an example of the configuration of the battery pack 11 will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view schematically showing the inside of the battery pack 11. In FIG. 2, the housing is indicated by a chain double-dashed line. FIG. 3 is a plan view showing the upper surface of each battery stack.

As shown in FIG. 2, the battery pack 11 includes an assembled battery 20, a plurality of monitoring devices 30, a control device 40, and a housing 50. The housing 50 houses other elements constituting the battery pack 11, that is, the assembled battery 20, the monitoring device 30, and the control device 40.

In the following, as shown in FIG. 2, among the surfaces of the housing 50 which is a substantially rectangular parallelepiped, the longitudinal direction is indicated as the X direction and the lateral direction is indicated as the Y direction on the mounting surface on the vehicle 10. In FIG. 2, the lower surface is the mounting surface. The vertical direction perpendicular to the mounting surface is referred to as the Z direction. The X direction, the Y direction, and the Z direction are in a positional relationship orthogonal to each other. In the present embodiment, the left-right direction of the vehicle 10 corresponds to the X direction, the front-rear direction corresponds to the Y direction, and the vertical direction corresponds to the Z direction. The arrangement of FIGS. 2 and 3 is only an example, and the battery pack 11 may be arranged with respect to the vehicle 10.

The assembled battery 20 has a plurality of battery stacks 21 arranged side by side in the X direction. The battery stack 21 may be referred to as a battery block or a battery module. The assembled battery 20 is configured by connecting a plurality of battery stacks 21 in series. Each battery stack 21 has a plurality of battery cells 22. The battery stack 21 has a plurality of battery cells 22 connected in series. The battery stack 21 of the present embodiment is configured by connecting a plurality of battery cells 22 arranged side by side in the Y direction in series. The assembled battery 20 provides the above-mentioned DC voltage source. The assembled battery 20, the battery stack 21, and the battery cell 22 correspond to the batteries.

The battery cell 22 is a secondary battery that generates an electromotive voltage by a chemical reaction. As the secondary battery, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery can be adopted. A lithium ion secondary battery is a secondary battery using lithium as a charge carrier. In addition to a general lithium ion secondary battery in which the electrolyte is liquid, a so-called all-solid-state battery using a solid electrolyte can also be included.

On the upper surface of each battery stack 21, linear bus bar units 23 are arranged at both ends in the X direction. That is, a pair of bus bar units 23 are arranged in each battery stack 21. The bus bar unit 23 electrically connects a plurality of battery cells 22. As shown in FIG. 3, each battery cell 22 is formed in a flat shape, and is laminated so that the side surfaces overlap each other in the Y direction. The battery cell 22 has positive electrode terminals 25 and negative electrode terminals 26 protruding in the Z direction, more specifically in the Z + direction indicating upwards, at both ends in the X direction. The battery cells 22 are laminated so that the positive electrode terminals 25 and the negative electrode terminals 26 are alternately arranged in the Y direction.

Each bus bar unit 23 has a plurality of bus bars 24 that electrically connect the positive electrode terminal 25 and the negative electrode terminal 26, and a bus bar cover 27 that covers the plurality of bus bars 24. The bus bar 24 is a plate material made of a metal having good conductivity such as copper. The bus bar 24 electrically connects the positive electrode terminal 25 and the negative electrode terminal 26 of the adjacent battery cells 22 in the Y direction. As a result, in each battery stack 21, a plurality of battery cells 22 are electrically connected in series. In each battery stack 21, the positive electrode terminal 25 of the battery cell 22 arranged on one end side in the Y direction is connected to a predetermined positive electrode wiring, and the negative electrode terminal 26 of the battery cell 22 arranged on the other end side is connected. It is connected to a predetermined negative electrode wiring.

The bus bar cover 27 is formed by using an electrically insulating material such as resin. The bus bar cover 27 is provided linearly from one end to the other of the battery stack 21 along the Y direction so as to cover the plurality of bus bars 24.

The monitoring device 30 is individually provided for the plurality of battery stacks 21. As shown in FIG. 2, the monitoring device 30 is arranged between the pair of bus bar units 23 in each battery stack 21. The monitoring device 30 is fixed to the bus bar unit 23 with screws or the like. As will be described later, the monitoring device 30 is configured to enable wireless communication with the control device 40. The antenna 37, which will be described later, included in the monitoring device 30 is arranged so as not to overlap the bus bar unit 23 in the Z direction, that is, to protrude from the bus bar unit 23 in the Z direction.

The control device 40 is attached to the outer side surface of the battery stack 21 arranged at one end in the X direction. The control device 40 is configured to enable wireless communication with each monitoring device 30. The antenna 42, which will be described later, included in the control device 40 is arranged at the same height as the radio antenna of the monitoring device 30 in the Z direction. That is, the antenna 42 of the control device 40 is provided so as to protrude from the bus bar unit 23 in the Z direction.

In the battery pack 11, the monitoring device 30 and the control device 40 provide a battery management system described later. That is, the battery pack 11 includes a battery management system.

<Battery management system>
Next, a schematic configuration of the battery management system will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the battery management system.

As shown in FIG. 4, the battery management system 100 includes a plurality of management devices (SBM) 30 and a control device (ECU) 40. SBM is an abbreviation for Satellite Battery Module. The control device 40 may be referred to as a battery ECU or BMU. BMU is an abbreviation for Battery Management Unit. The battery management system 100 is a system that manages batteries by using wireless communication. In the battery management system 100, wireless communication is executed between one control device 40 and a plurality of monitoring devices 30.

<Monitoring device>
First, the monitoring device 30 will be described. Since the configurations of the monitoring devices 30 are almost the same as each other, the common configurations will be described below. The monitoring device 30 includes a power supply circuit (PSC) 31, a multiplexer (MUX) 32, a monitoring IC (MIC) 33, a microcomputer (MC) 34, a wireless IC (WIC) 35, and a front-end circuit (FE) 36. And an antenna (ANT) 37. Communication between each element in the monitoring device 30 is performed by wire.

The power supply circuit 31 uses the voltage supplied from the battery stack 21 to generate an operating power supply for other circuit elements included in the monitoring device 30. In this embodiment, the power supply circuit 31 includes power supply circuits 311, 312, 313. The power supply circuit 311 generates a predetermined voltage using the voltage supplied from the battery stack 21 and supplies it to the monitoring IC 33. The power supply circuit 312 generates a predetermined voltage using the voltage generated by the power supply circuit 311 and supplies it to the microcomputer 34. The power supply circuit 313 generates a predetermined voltage using the voltage generated by the power supply circuit 311 and supplies it to the wireless IC 35.

The multiplexer 32 is a selection circuit that inputs detection signals of a plurality of sensors 60 included in the battery pack 11 and outputs them as one signal. The multiplexer 32 selects (switches) the input according to the selection signal from the monitoring IC 33 and outputs it as one signal. The sensor 60 includes a sensor that detects the physical quantity of each of the battery cells 22, a sensor for determining which battery cell 22 is, and the like. Physical quantity detection sensors include, for example, voltage sensors, temperature sensors, current sensors, and the like.

The monitoring IC 33 senses (acquires) battery information such as cell voltage, cell temperature, and cell discrimination through the multiplexer 32, and transmits the battery information to the microcomputer 34. The monitoring IC 33 is sometimes referred to as a cell monitoring circuit (CSC). CSC is an abbreviation for Cell Supervising Circuit. The monitoring IC 33 may have a function of executing a failure diagnosis of a circuit portion of the monitoring device 30 including itself and transmitting a diagnosis result together with battery information as monitoring data. When the monitoring IC 33 receives the data requested to acquire the battery information transmitted from the microcomputer 34, the monitoring IC 33 senses the battery information through the multiplexer 32 and transmits the monitoring data including at least the battery information to the microcomputer 34. The monitoring IC 33 corresponds to the monitoring unit.

The microcomputer 34 is a microcomputer provided with a CPU as a processor, ROMs and RAMs as memories, input / output interfaces, and a bus for connecting them. The CPU constructs a plurality of functional units by executing various programs stored in the ROM while using the temporary storage function of the RAM. ROM is an abbreviation for Read Only Memory. RAM is an abbreviation for Random Access Memory.

The microcomputer 34 controls the schedule of sensing and self-diagnosis by the monitoring IC 33. The microcomputer 34 receives the monitoring data transmitted from the monitoring IC 33 and transmits it to the wireless IC 35. The microcomputer 34 transmits data requesting acquisition of battery information to the monitoring IC 33. As an example, when the microcomputer 34 of the present embodiment receives the data requesting the acquisition of the battery information transmitted from the wireless IC 35, the microcomputer 34 transmits the data requesting the acquisition of the battery information to the monitoring IC 33.

The wireless IC 35 includes an RF circuit for transmitting and receiving data wirelessly. The wireless IC 35 may include a microcomputer in addition to the RF circuit. The wireless IC 35 has a transmission function of modulating the transmission data and oscillating at the frequency of the RF signal. The wireless IC 35 has a receiving function for demodulating received data. RF is an abbreviation for radio frequency.

The wireless IC 35 modulates the data including the monitoring information transmitted from the microcomputer 34 and transmits it to the control device 40 via the front-end circuit 36 and the antenna 37. The wireless IC 35 adds data necessary for wireless communication such as communication control information to transmission data including battery information and transmits the data. The data required for wireless communication includes, for example, an identifier (ID) and an error detection code. The wireless IC 35 controls the data size, communication format, schedule, error detection, etc. of the communication between the SBM 30 and the control device 40.

The wireless IC 35 receives the data transmitted from the control device 40 via the antenna 37 and the front-end circuit 36, and demodulates the data. For example, when the wireless IC 35 receives the data including the battery information transmission request, the wireless IC 35 transmits the data including the battery information to the control device 40 as a response to the request. As an example, when the wireless IC 35 of the present embodiment receives the data including the acquisition request of the battery information, the wireless IC 35 transmits the data (information) related to the acquisition request to the microcomputer 34. The wireless IC 35 corresponds to the wireless circuit section.

The wireless IC 35 has a transmission buffer (BUF) 350 for storing battery information. The transmission buffer 350 temporarily holds monitoring data including battery information. The transmission buffer 350 is configured to be able to store monitoring data for a plurality of times, that is, battery information acquired by the monitoring IC 33 a plurality of times. The transmission buffer 350 of this embodiment is a hardware circuit configured in the RF circuit. In the configuration in which the wireless IC 35 includes a microcomputer, the transmission buffer 350 may be configured on the software. When the wireless IC 35 receives the communication establishment information transmitted by the control device 40, the wireless IC 35 deletes the monitoring data for which communication is established from the transmission buffer 350.

The front-end circuit 36 has a matching circuit for impedance matching between the wireless IC 35 and the antenna 37, and a filter circuit for removing unnecessary frequency components.

The antenna 37 converts an RF signal, which is an electric signal, into a radio wave and radiates it into space. The antenna 37 receives radio waves propagating in space and converts them into electrical signals.

<Control device>
Next, the control device 40 will be described. The control device 40 includes a power supply circuit (PSC) 41, an antenna (ANT) 42, a front-end circuit (FE) 43, a wireless IC (WIC) 44, a main microcomputer (MMC) 45, and a sub-microcomputer (SMC). It is equipped with 46. Communication between each element in the control device 40 is performed by wire.

The power supply circuit 41 uses the voltage supplied from the battery (BAT) 15 to generate an operating power supply for other circuit elements included in the control device 40. The battery 15 is a DC voltage source mounted on the vehicle 10 and different from the battery pack 11. The battery 15 is sometimes referred to as an auxiliary battery because it supplies electric power to the auxiliary equipment of the vehicle 10. In this embodiment, the power supply circuit 41 includes power supply circuits 411 and 412. The power supply circuit 411 generates a predetermined voltage using the voltage supplied from the battery 15, and supplies the voltage to the main microcomputer 45 and the sub microcomputer 46. For the sake of simplification of the figure, the electrical connection between the power supply circuit 411 and the sub-microcomputer 46 is omitted. The power supply circuit 412 generates a predetermined voltage using the voltage generated by the power supply circuit 411 and supplies it to the wireless IC 44.

The antenna 42 converts an RF signal, which is an electric signal, into a radio wave and radiates it into space. The antenna 42 receives radio waves propagating in space and converts them into electrical signals.

The front-end circuit 43 includes a matching circuit for impedance matching between the wireless IC 44 and the antenna 42, and a filter circuit for removing unnecessary frequency components.

The wireless IC 44 has an RF circuit for transmitting and receiving data wirelessly. The wireless IC 44 has the same configuration as the wireless IC 35. The wireless IC 44 has a transmission function and a reception function. The wireless IC 44 receives the data transmitted from the monitoring device 30 via the antenna 42 and the front-end circuit 43, and demodulates the data. Then, the monitoring data including the battery information is transmitted to the main microcomputer 45. The wireless IC 44 receives the data transmitted from the main microcomputer 45, modulates it, and transmits it to the monitoring device 30 via the front-end circuit 43 and the antenna 42. The wireless IC 44 adds data necessary for wireless communication such as communication control information to the transmission data and transmits the data. The data required for wireless communication includes, for example, an identifier (ID) and an error detection code. The wireless IC 44 controls the data size, communication format, schedule, error detection, and the like of communication between the monitoring device 30 and the control device 40.

The main microcomputer 45 is a microcomputer provided with a CPU, a ROM, a RAM, an input / output interface, a bus connecting them, and the like. The ROM stores various programs executed by the CPU. The main microcomputer 45 generates a command requesting processing from the monitoring device 30, and transmits transmission data including the command to the wireless IC 44.

The main microcomputer 45 generates, for example, a transmission request command for requesting transmission of monitoring data including battery information. The main microcomputer 45 can include an acquisition request command requesting acquisition of monitoring data in the transmission data including the transmission request command. The main microcomputer 45 can include communication establishment information indicating whether or not wireless communication with the monitoring device 30 has been normally performed in the transmission data including the transmission request command.

The main microcomputer 45 receives the monitoring data including the battery information transmitted from the wireless IC 44, and executes a predetermined process based on the monitoring data. For example, the main microcomputer 45 executes a process of transmitting the acquired battery information to the ECU 14. The main microcomputer 45 may calculate the SOC and / or SOH based on the battery information, and transmit the battery information including the calculated SOC and SOH to the ECU 14. The main microcomputer 45 may execute an equalization process for equalizing the voltage of each battery cell 22 based on the battery information. The main microcomputer 45 may acquire the IG signal of the vehicle 10 and execute the above-described processing according to the driving state of the vehicle 10 based on the IG signal. The main microcomputer 45 may execute a process of detecting an abnormality in the battery cell 22 based on the battery information, or may transmit the abnormality detection information to the ECU 14.

The sub-microcomputer 46 is a microcomputer provided with a CPU, ROM, RAM, an input / output interface, a bus connecting these, and the like. The ROM stores various programs executed by the CPU. The sub-microcomputer 46 executes the monitoring process in the control device 40. For example, the sub-microcomputer 46 may monitor the data between the wireless IC 44 and the main microcomputer 45. The sub-microcomputer 46 may monitor the state of the main microcomputer 45. The sub-microcomputer 46 may monitor the state of the wireless IC 44.

<Sending and receiving battery information>
Next, transmission / reception of battery information between the control device 40 and one monitoring device 30 will be described with reference to FIG. FIG. 5 shows an example of a sequence of requesting and responding to battery information. In FIG. 5, the monitoring IC 33 is shown as MIC33, the wireless IC35 is shown as WIC35, and the control device 40 is shown as ECU40.

As shown in FIG. 5, the control device 40 transmits the request data including the acquisition request and the transmission request of the monitoring data including the battery information to the monitoring device 30 (step S10). The transmission data in step S10 corresponds to the periodic data transmitted in a predetermined cycle among the request data. Requests are sometimes referred to as instructions. The request data to be transmitted also includes communication establishment information indicating whether or not the control device 40 has normally received the response data including the battery information in the previous transmission / reception, that is, the previous request and response. For example, in the case of the first transmission / reception after the power is turned on, the communication establishment information may be regarded as the communication failure. Since all the data in the transmission buffer 350 is deleted by turning off the power, the communication establishment information may be regarded as the communication establishment.

When the wireless IC 35 of the monitoring device 30 receives the request data, when the communication establishment information indicates the communication establishment, the wireless IC 35 deletes the communication establishment data, that is, the previous monitoring data from the transmission buffer 350 (step S20). The previous data deletion is executed only when communication is established. If communication is not established, the previous monitoring data is not deleted from the transmission buffer 350 and is retained.

Next, the wireless IC 35 transmits a request for acquiring monitoring data including battery information to the monitoring IC 33 (step S30). In the present embodiment, the wireless IC 35 transmits an acquisition request to the monitoring IC 33 via the microcomputer 34.

Upon receiving the acquisition request, the monitoring IC 33 executes sensing (step S40). The monitoring IC 33 executes sensing and acquires battery information of each battery cell 22 through the multiplexer 32. In addition, the monitoring IC 33 executes a circuit failure diagnosis.

Then, the monitoring IC 33 transmits the monitoring data including the battery information to the wireless IC 35 (step S50). In the present embodiment, monitoring data including the failure diagnosis result is transmitted together with the battery information. The monitoring IC 33 transmits to the wireless IC 35 via the microcomputer 34.

When the wireless IC 35 receives the monitoring data acquired by the monitoring IC 33, the wireless IC 35 stores the monitoring data in the transmission buffer 350 (step S60). Then, the wireless IC 35 transmits the transmission data including the monitoring data for one time to the control device 40 as the response data among the monitoring data stored in the transmission buffer 350 (step S70). The wireless IC 35 transmits, for example, the monitoring data stored in the transmission buffer 350 in chronological order in chronological order. When the previous monitoring data is not stored in the transmission buffer 350, the wireless IC 35 transmits the data acquired in step S60, that is, the monitoring data acquired this time to the control device 40.

The control device 40 determines the establishment of communication after executing the process of step S10 (step S80). The control device 40 determines whether or not the monitoring data including the battery information is normally received within one cycle of transmission and reception, and reflects this determination result in the communication establishment information to be transmitted next time.

The communication establishment information is information that can distinguish between the communication establishment normally received by the control device 40 and the communication failure not normally received. The control device 40 determines that the communication is not established, for example, when the monitoring data including the battery information cannot be received within one cycle. When the control device 40 cannot receive the monitoring data within a predetermined time shorter than one cycle, it may determine that the communication is not established. For example, the control device 40 may perform a time-out check by including the sequence number in the request data to be transmitted and having the sequence number returned as the response data. Further, the control device 40 also determines that the communication has not been established even when the communication error is detected by the inspection executed at the time of reception although the reception can be received. When the control device 40 receives the data, the control device 40 executes an inspection using, for example, an error detection code. The communication establishment information may include information indicating communication establishment and / or information indicating communication failure. Even when the information indicating the establishment of communication and the information indicating the failure of communication are included, the wireless IC 35 can determine whether or not the previous communication was established.

The battery management system 100 repeatedly executes the processes of steps S10 to S80 described above in a predetermined cycle.

<Summary of the first embodiment>
According to the battery management system 100 of the present embodiment, the wireless IC 35 of the monitoring device 30 includes a transmission buffer 350. The transmission buffer 350 can store monitoring data for a plurality of times by the monitoring IC 33 of the monitoring device 30, that is, battery information for a plurality of times. The monitoring data stored in the transmission buffer 350 is deleted when the communication with the control device 40 is normally performed by the communication establishment information from the control device 40. On the other hand, when the communication is not performed normally, the monitoring data is not deleted but is held in the transmission buffer 350 and retransmitted. As a result, it is possible to suppress the loss of data including battery information.

In the case of wireless communication, the communication speed is slower than that of wired communication, and the communication frequency is often low. Therefore, if an abnormality occurs in at least one of the physical quantities such as the voltage of the battery cell 22, or if an abnormality is detected by the failure diagnosis information, or if the monitoring data is missing, the value may be changed suddenly. There is sex. If the value is changed abruptly, the control will be changed abruptly, and although there is no problem in safety, there is a risk that operability will be affected. On the other hand, according to the present embodiment, it is possible to suppress the lack of monitoring data indicating an abnormality. Thereby, the influence on the operability can be suppressed.

In addition, by suppressing the loss of monitoring data, it is possible to accurately estimate factors that are estimated by accumulating monitoring data, such as accumulation of battery damage. In addition, the abnormality may be detected by the number of times the threshold value is exceeded. Also in this case, by suppressing the loss of monitoring data, it is possible to accelerate the detection timing of the abnormality.

6 and 7 are timing charts showing an example of transmission / reception, that is, request and response in the battery management system 100 according to the present embodiment. FIG. 6 shows an example in which transmission / reception is normally performed over a plurality of cycles. FIG. 7 shows an example of a case where transmission / reception is not normal.

Each of T1, T2, and T3 shown in FIGS. 6 and 7 indicates one transmission / reception cycle. TxA indicates the request data transmitted from the control device 40 to the monitoring device 30. TxA corresponds to periodic data. Rx indicates the monitoring data among the response data transmitted from the monitoring device 30 to the control device 40. The number added to Rx indicates the number of times (the number of cycles) the monitoring IC 33 acquired the monitoring data. For example, Rx1 is the monitoring data acquired in the first period T1. In the following, it is assumed that the monitoring data is not accumulated in the transmission buffer 350 at the stage of executing the process of the first cycle T1.

When the communication is successful, the previous monitoring data stored in the transmission buffer 350 is deleted by the communication establishment information included in the data TxA. Therefore, as shown in FIG. 6, when the communication establishment continues, the acquired monitoring data can be transmitted to the control device 40 as a response signal within the cycle. That is, the monitoring data including the latest acquired battery information can be transmitted to the control device 40. The control device 40 can execute processing based on the latest monitoring data.

In the example shown in FIG. 7, the control device 40 cannot normally receive the data Rx1 in the first cycle T1. Therefore, in the second cycle T2, the communication establishment information included in the data TxA indicates that the communication is not established. As a result, the data Rx1 of the transmission buffer 350 is retained and transmitted as the response data of the second period T2. The data Rx2 acquired in the second cycle T2 is not transmitted in the second cycle T2 and is held in the transmission buffer 350. In the second cycle T2, the control device 40 normally receives the data Rx1. Therefore, the data Rx2 is transmitted in the third period T3. In this way, the data for which communication has not been established can be transmitted again without being deleted. That is, it is possible to suppress the loss of data including battery information.

In the present embodiment, the control device 40 requests the acquisition and transmission of monitoring data including battery information, and the monitoring IC 33 acquires and transmits the monitoring data accordingly. This eliminates the need for the monitoring IC 33 to manage and grasp the communication schedule. Further, by centrally managing the communication schedule by the control device 40, it is possible to easily manage and change the communication schedule. Moreover, the control in the monitoring IC 33 can be simplified.

In the present embodiment, an example is shown in which the monitoring data acquired by the monitoring IC 33 is stored in the transmission buffer 350 after the previous data of the establishment of communication is deleted from the transmission buffer 350. However, after accumulating the acquired monitoring data in the transmission buffer 350, the previous data of the establishment of communication may be deleted from the transmission buffer 350. Before executing the data transmission process in step S70, it is sufficient that the previous data of the establishment of communication is deleted and the monitoring data acquired this time is accumulated.

(Second Embodiment)
This embodiment is a modification based on the preceding embodiment, and the description of the preceding embodiment can be incorporated. In the prior embodiment, an example is shown in which the processing of the request and response of the monitoring data is executed only once in one cycle. Alternatively, the request and response processing may be executed multiple times depending on the accumulated data in the transmission buffer 350.

FIG. 8 shows an example of a sequence of requesting and responding to battery information in the battery management system 100 according to the present embodiment. FIG. 8 corresponds to FIG. The processing up to step S60 is the same as that of the preceding embodiment. Therefore, the description of steps S10 to S50 is omitted, and the drawings are shown from step S60.

As shown in FIG. 8, the wireless IC 35 executes the process of step S60, that is, the process of accumulating the monitoring data acquired by the monitoring IC 33 in the transmission buffer 350, and then executes the process of step S70A. In step S70A, instead of the process of step S70 described in the preceding embodiment, the untransmitted storage information is transmitted together with the one-time monitoring data stored in the transmission buffer 350. The untransmitted storage information is monitoring data that is stored in the transmission buffer 350 and is different from the monitoring data transmitted in step S70A, and is information about the monitoring data that has not been transmitted in this transmission / reception cycle. For example, the number of untransmitted monitoring data may be used, or an identifier that identifies untransmitted monitoring data may be used. The battery information included in the monitoring data transmitted in the process of step S70A corresponds to the first battery information. The battery information included in the untransmitted monitoring data corresponds to the second battery information.

After the execution of step S70A, the control device 40 executes the process of step S80, that is, the communication establishment determination, as in the preceding embodiment, as in the preceding embodiment.

The control device 40 executes the determination of the additional transmission process based on the untransmitted storage information in the received response data (step S90). The control device 40 determines whether or not additional transmission / reception processing is possible based on, for example, the presence / absence of untransmitted data and the remaining time of the transmission / reception cycle, and if it is determined that it is possible, executes the processing of step S100. If it is determined that it is impossible, the process of step S100 is not executed, and the process of step S10 is executed in the next cycle.

In step S100, the control device 40 executes a process excluding the monitoring data acquisition request from the process of step S10. That is, the request data including the transmission request of the monitoring data and the communication establishment information is transmitted. The request data transmitted in the process of step S10 corresponds to the first request data. The request data transmitted in step S100 corresponds to the second request data.

When the wireless IC 35 of the monitoring device 30 receives the request data processed in step S100, the wireless IC 35 executes the process of step S110. Step S110 is the same process as step S20. In step S110, when the communication establishment information indicates that the communication is established, the wireless IC 35 deletes the previous monitoring data that the communication was established from the transmission buffer 350.

Since the received request data does not include the acquisition request, the same processing as in steps S30 to S60 is not executed in the additional transmission / reception processing. When the process of step S110 is completed, the wireless IC 35 executes the process of step S120. Step S120 is the same process as step S70A.

After executing step S120, the control device 40 executes the process of step S130 and the process of step S140. Step S130 is the same process as step S80, and step S140 is the same process as step S90. The process surrounded by the alternate long and short dash line shown in FIG. 8, that is, the processes of steps S100 to S140 is an additional transmission / reception process. In step S140, when the control device 40 determines that the additional transmission / reception processing is possible, the control device 40 executes the additional transmission / reception processing again. In this way, when there is untransmitted monitoring data in the transmission buffer 350 and transmission / reception within a cycle is possible, additional transmission / reception processing is repeatedly executed.

The wireless IC 35 may, for example, manage the flag of the transmission buffer 350 in the above processing. Set the flag to 1 when the monitoring data stored in the transmission buffer is transmitted. When communication is established in this state, the corresponding monitoring data is deleted from the transmission buffer 350. On the other hand, when communication is not established, the flag for the corresponding monitoring data is reset to 0. As a result, in the case of communication failure, the monitoring data is not deleted and is retained. This method can be applied to prior embodiments.

When a plurality of monitoring data are accumulated, the transmission buffer 350 performs monitoring data transmission processing in chronological order of acquisition, for example. The transmission buffer 350 shifts the operation position by one when executing additional transmission (step S120) within one cycle. As described above, when the first transmitted monitoring data is not established in one cycle, the monitoring data can be retained without being deleted and another monitoring data can be transmitted.

<Summary of the second embodiment>
In the present embodiment, when the wireless IC 35 transmits the monitoring data (battery information) stored in the transmission buffer 350 in response to the request data (first request data) from the control device 40, the battery information (first) to be transmitted is transmitted. It is different from the battery information), and the stored information of the untransmitted battery information (second battery information) is included in the response data and transmitted. When the control device 40 receives the response data including the accumulated information, the control device 40 transmits the request data (second request data) requesting the transmission of the untransmitted battery information to the monitoring device 30 within the same cycle as the first request data. do. That is, when there is remaining data in the transmission buffer 350, additional transmission / reception processing is executed. As a result, it is possible to suppress the delay in the transmission of the latest monitoring data while suppressing the loss of the monitoring data as in the preceding embodiment.

For example, it is preferable to use the latest battery information for charge / discharge control of the assembled battery 20 and control of the PCU 12 and MG 13. According to this embodiment, it is possible to improve the accuracy of estimation such as the accumulation of battery damage, which is affected by the lack of monitoring data, and the accuracy of various controls in which the latest monitoring data is important.

9 and 10 are timing charts showing an example of a request and a response in the battery management system 100 according to the present embodiment. 9 and 10 correspond to FIGS. 6 and 7 described above. TxA indicates the first request data, and TxB indicates the second request data (additional request data). TxA corresponds to periodic data. Here, too, it is assumed that no data has been accumulated in the transmission buffer 350 at the stage of executing the process of the first cycle T1.

FIG. 9 shows an example in which the control device 40 cannot receive the data Rx1 transmitted by the monitoring device 30 in the first cycle T1. The control device 40 cannot receive the unstored information. In the second cycle T2, the communication establishment information included in the data TxA indicates communication failure. Therefore, when the monitoring device 30 receives the data TxA, the monitoring device 30 holds the data Rx1 stored in the transmission buffer 350 without deleting it. The monitoring device 30 transmits data Rx1 from the transmission buffer 350 as response data in the second cycle T2. The data Rx2 acquired in the second cycle T2 is not transmitted and is held in the transmission buffer 350. Therefore, the response signal includes data Rx1 and untransmitted storage information indicating that there is untransmitted data.

In the second cycle T2, the control device 40 normally receives the data Rx1. Since there is untransmitted monitoring data, the control device 40 transmits the data TxB including the additional transmission request. When the monitoring device 30 receives the data TxB, the monitoring device 30 deletes the data Rx1 stored in the transmission buffer 350 based on the communication establishment information included in the data TxB. In addition, data Rx2 is transmitted from the transmission buffer 350. The response signal includes data Rx2 and untransmitted storage information indicating that there is no untransmitted data.

In the second cycle T2, the control device 40 normally receives the data Rx2. Since there is no untransmitted data, the control device 40 does not execute the additional transmission request. In the third cycle T3, the communication establishment information included in the data TxA indicates the communication establishment of the data Rx2. When the monitoring device 30 receives the data TxA, the monitoring device 30 deletes the data Rx2 stored in the transmission buffer 350 based on the communication establishment information. Further, the acquired data Rx3 is transmitted from the transmission buffer 350.

FIG. 10 shows an example in which the control device 40 cannot operate the control device 40 in the first cycle T1 and receives the data RX1 in the second cycle T2, and detects a communication error by inspection. Since the flow until the monitoring device 30 retransmits the data Rx1 in the second cycle T2 is the same as that in FIG. 9, the description is omitted. The data Rx1 is transmitted with untransmitted storage information indicating that there is untransmitted data.

In the second cycle T2, the control device 40 receives the data Rx1, but detects a communication error by inspection using an error correction code or the like. Since there is untransmitted data, the control device 40 transmits the data TxB including the additional transmission request. The data TxB includes communication establishment information indicating communication failure. When the monitoring device 30 receives the data TxB, the monitoring device 30 holds the data Rx1 stored in the transmission buffer 350 without deleting it based on the communication establishment information included in the data TxB. In addition, data Rx2 is transmitted from the transmission buffer 350. The response signal includes data Rx2 and untransmitted storage information indicating that there is no untransmitted data.

In the second cycle T2, the control device 40 normally receives the data Rx2. Since there is no untransmitted data, the control device 40 does not execute the additional transmission request. In the third cycle T3, the communication establishment information included in the data TxA indicates the communication establishment of the data Rx2. When the monitoring device 30 receives the data TxA, the monitoring device 30 deletes the data Rx2 stored in the transmission buffer 350 based on the communication establishment information. The monitoring device 30 transmits data Rx1 from the transmission buffer 350 as response data in the third period T3. The data Rx3 acquired in the third cycle T3 is not transmitted and is held in the transmission buffer 350. The response signal includes data Rx1 and untransmitted storage information indicating that there is untransmitted data.

In the third cycle T3, the control device 40 normally receives the data Rx1. Since there is untransmitted data, the control device 40 transmits the data TxB including the additional transmission request. When the monitoring device 30 receives the data TxB, the monitoring device 30 deletes the data Rx1 stored in the transmission buffer 350 based on the communication establishment information included in the data TxB. In addition, data Rx3 is transmitted from the transmission buffer 350. The response signal includes data Rx3 and untransmitted storage information indicating that there is no untransmitted data.

As can be seen from the examples shown in FIGS. 9 and 10, according to the present embodiment, it is possible to suppress the delay in the transmission of the latest monitoring data while suppressing the loss of the monitoring data.

(Third Embodiment)
This embodiment is a modification based on the preceding embodiment, and the description of the preceding embodiment can be incorporated. Although not specifically mentioned in the prior embodiment, all the data stored in the transmission buffer 350 may be deleted when a predetermined condition is satisfied.

FIG. 11 is a diagram showing a process executed by the wireless IC 35 in the battery management system 100 according to the present embodiment. The wireless IC 35 deletes all the monitoring data in the transmission buffer 350 when the transmission buffer 350 is full, that is, when the new monitoring data acquired by the monitoring IC 33 cannot be stored in the transmission buffer 350. In other words, it returns to the initial state where monitoring data is not accumulated. As a result, the newly acquired monitoring data (dataG) can be stored in the transmission buffer 350.

The wireless IC 35 may determine whether or not there is a vacancy based on the accumulated information of the monitoring data in the transmission buffer 350, and if it is determined that there is no vacancy, all the data of the transmission buffer 350 may be deleted at once. All data may be deleted by hard processing such as power-on reset. You may delete all the data by executing the reset process on the software.

Further, the connection establishment state between the monitoring device 30 and the control device 40 may be released, and all the data may be deleted with this release. In this case, connection establishment work such as so-called pairing is required again. Further, the control device 40 may determine the availability of the transmission buffer 350 and transmit an instruction to delete all the data stored in the transmission buffer 350 to the monitoring device 30. When the monitoring device 30 receives the deletion instruction of all data, the monitoring device 30 deletes all the data of the transmission buffer 350 at once. The control device 40 may determine the availability of the transmission buffer 350 based on, for example, untransmitted storage information and communication establishment information.

<Summary of the third embodiment>
As described above, in the present embodiment, when the transmission buffer 350 is full, the wireless IC 35 deletes all the monitoring data in the transmission buffer 350. Therefore, when the communication environment between the monitoring device 30 and the control device 40 deteriorates and communication abnormality, that is, communication failure continues, it is possible to suppress the newly acquired monitoring data from being unable to be transmitted. For example, in a configuration in which additional transmission / reception processing is executed, it is possible to suppress that the newly acquired monitoring data cannot be transmitted within the acquired cycle.

<Modification example>
The timing for deleting all the data stored in the transmission buffer 350 is not limited to the state where the transmission buffer 350 is full. For example, the number of data that can be transmitted in one transmission / reception cycle may be smaller than the number of data that can be stored in the transmission buffer 350. In such a case, when the data that can be transmitted in one cycle is exceeded, the wireless IC 35 may delete all the data stored in the transmission buffer 350.

For example, when the number of data that can be transmitted from the monitoring device 30 in one cycle is three, as shown in FIG. 12, three monitoring data are stored in the transmission buffer 350. Since four monitoring data are accumulated when the newly acquired monitoring data is included, the wireless IC 35 deletes all the monitoring data in the transmission buffer 350. As a result, the newly acquired monitoring data (dataG) can be stored in the transmission buffer 350.

The deletion of all the data shown in the third embodiment and its modified examples can be combined with any of the preceding embodiments.

(Other embodiments)
Disclosure in this specification, drawings and the like is not limited to the illustrated embodiments. The disclosure includes exemplary embodiments and modifications by those skilled in the art based on them. For example, disclosure is not limited to the parts and / or element combinations shown in the embodiments. Disclosure can be carried out in various combinations. The disclosure can have additional parts that can be added to the embodiment. Disclosures include those in which the parts and / or elements of the embodiment are omitted. Disclosures include replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scopes disclosed are indicated by the claims description and should be understood to include all modifications within the meaning and scope equivalent to the claims statement.

Disclosure in the description, drawings, etc. is not limited by the description of the scope of claims. The disclosure in the description, drawings, etc. includes the technical ideas described in the claims, and further covers a wider variety of technical ideas than the technical ideas described in the claims. Therefore, various technical ideas can be extracted from the disclosure of the description, drawings, etc. without being bound by the description of the claims.

When an element or layer is mentioned as "above," "connected," "connected," or "connected," it is relative to another element, or another layer. It may be directly connected, connected, or connected, and there may be intervening elements or layers. In contrast, one element is "directly above", "directly connected", "directly connected" or "directly connected" to another element or layer. If it is mentioned, there are no intervening elements or intervening layers. Other terms used to describe the relationships between elements are similar (eg, "between" vs. "directly between", "adjacent" vs. "directly adjacent", etc. ) Should be interpreted. As used herein, the term "and / or" includes any combination, and all combinations, with respect to one or more related listed items.

The spatially relative terms "inside", "outside", "back", "bottom", "low", "top", "high", etc. are one element or feature as illustrated. It is used herein to facilitate descriptions that describe the relationship to other elements or features. Spatial relative terms can be intended to include different orientations of the device in use or operation, in addition to the orientations depicted in the drawings. For example, when the device in the figure is flipped over, an element described as "below" or "directly below" another element or feature is directed "above" the other element or feature. Therefore, the term "down" can include both up and down orientations. The device may be oriented in the other direction (rotated 90 degrees or in any other direction), and the spatially relative descriptors used herein are interpreted accordingly. ..

The devices, systems, and methods thereof described in the present disclosure may be implemented by a dedicated computer constituting a processor programmed to perform one or more functions embodied by a computer program. Further, the apparatus and the method thereof described in the present disclosure may be realized by using a dedicated hardware logic circuit. Further, the apparatus and method thereof described in the present disclosure may be realized by one or more dedicated computers configured by a combination of a processor for executing a computer program and one or more hardware logic circuits. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer. That is, the means and / or functions provided by the processor or the like can be provided by the software recorded in the actual memory device and the computer, software only, hardware only, or a combination thereof that executes the software. For example, some or all of the functions provided by the processor may be realized as hardware. A mode in which a certain function is realized as hardware includes a mode in which one or more ICs are used. The processor may be realized by using MPU, GPU, DFP instead of CPU. The processor may be realized by combining a plurality of types of arithmetic processing units such as a CPU, an MPU, and a GPU. The processor may be implemented as a system on chip (SoC). Further, various processing units may be realized by using FPGA or ASIC. The various programs may be stored in a non-transitional substantive recording medium. DFP, which can adopt various storage media such as HDD, SSD, flash memory, and SD card as the storage medium of the program, is an abbreviation for Data Flow Processor. SoC is an abbreviation for System on Chip. FPGA is an abbreviation for Field Programmable Gate Array. ASIC is an abbreviation for Application Specific Integrated Circuit. HDD is an abbreviation for Hard disk Drive. SSD is an abbreviation for Solid State Drive. SD is an abbreviation for Secure Digital.

For example, an example in which the monitoring device 30 includes the microcomputer 34 has been shown, but the present invention is not limited to this. As shown in FIG. 13, a battery management system 100 having a configuration in which the monitoring device 30 does not include the microcomputer 34 may be adopted. FIG. 13 corresponds to FIG. In this configuration, the wireless IC 35 transmits / receives data to / from the monitoring IC 33. The wireless IC 35 may execute the sensing by the monitoring IC 33 and the schedule control of the self-diagnosis, or the main microcomputer 45 of the control device 40 may execute the schedule control.

An example is shown in which the periodic data (TxA) as the request data periodically transmitted by the control device 40 includes the acquisition request and the transmission request of the monitoring data including the battery information, but the present invention is not limited thereto. The periodic data may include only the transmission request of the monitoring data without including the acquisition request of the monitoring data. The monitoring device 30 may acquire monitoring data at a predetermined cycle set in advance according to the transmission / reception cycle, instead of acquiring new monitoring data triggered by an acquisition request from the control device 40. The predetermined cycle corresponds to, for example, one cycle of transmission and reception.

An example in which the monitoring device 30 is arranged for each battery stack 21 has been shown, but the present invention is not limited to this. For example, one monitoring device 30 may be arranged for a plurality of battery stacks 21. A plurality of monitoring devices 30 may be arranged for one battery stack 21.

An example is shown in which the battery pack 11 includes one control device 40, but the present invention is not limited to this. A plurality of control devices 40 may be provided. That is, the battery pack 11 may include one or more monitoring devices 30 and one or more control devices 40. The battery management system 100 may include a plurality of sets of wireless communication systems constructed between one control device 40 and one or more monitoring devices 30.

An example is shown in which the monitoring device 30 includes one monitoring IC 33, but the present invention is not limited to this. A plurality of monitoring ICs 33 may be provided. In this case, a wireless IC 35 may be provided for each monitoring IC 33, or one wireless IC 35 may be provided for a plurality of monitoring ICs 33.

The arrangement and number of the battery stack 21 and the battery cell 22 constituting the assembled battery 20 are not limited to the above examples. In the battery pack 11, the arrangement of the monitoring device 30 and / or the control device 40 is not limited to the above example.

10 ... Vehicle, 11 ... Battery pack, 12 ... PCU, 13 ... MG, 14 ... ECU, 15 ... Battery, 20 ... Batteries, 21 ... Battery stack, 22 ... Battery cell, 23 ... Bus bar unit, 24 ... Bus bar, 25 ... Positive terminal, 26 ... Negative terminal, 27 ... Bus bar cover, 30 ... Monitoring device, 31, 311, 312, 313 ... Power supply circuit, 32 ... multiplexer, 33 ... Monitoring IC, 34 ... Microcomputer, 35 ... Wireless IC, 350 ... Transmission battery, 36 ... front-end circuit, 37 ... antenna, 40 ... control device, 41, 411, 412 ... power supply circuit, 42 ... antenna, 43 ... front-end circuit, 44 ... wireless IC, 45 ... main microcomputer, 46 ... sub Microcomputer, 50 ... chassis, 60 ... sensor, 100 ... battery management system

Claims (7)

A monitoring device including a monitoring unit (33) that acquires and monitors battery information indicating the battery status, and a wireless circuit unit (35) that can transmit and receive data between the monitoring unit and execute wireless communication. (30) and
A control device (40) that performs wireless communication with the wireless circuit unit and executes a predetermined process based on the battery information is provided.
The control device transmits request data requesting the monitoring device to transmit the battery information, and when the monitoring device receives the request data, the control device transmits response data including the battery information to the control device. death,
The control device includes the following communication establishment information that can distinguish between the communication establishment in which the response data is normally received and the communication failure in which the response data is not normally received with respect to the request data. Send the request data and
The request data includes periodic data transmitted at a predetermined cycle, and includes periodic data.
The radio circuit unit includes a transmission buffer (350) capable of individually accumulating the battery information for a plurality of times acquired by the monitoring unit, and for one request data, one time in the transmission buffer. The battery information is transmitted to the control device, the battery information corresponding to the case where communication is established is deleted from the transmission buffer based on the communication establishment information, and the battery information is held in the transmission buffer when communication is not established. Battery management system. When the wireless circuit unit transmits the battery information in the transmission buffer in response to the first request data which is the request data, the wireless circuit unit is different from the first battery information which is the battery information to be transmitted and is not yet. The accumulated information of the second battery information for transmission is included in the response data and transmitted to the control device.
When the control device receives the information in which the second battery information is stored, the control device requests the second request data for requesting the transmission of the second battery information within the same cycle as the first request data. The battery management system according to claim 1, which is transmitted as data to the monitoring device. When the control device normally receives the response data including the first battery information with respect to the first request data, the control device transmits the second request data including information indicating communication establishment to the monitoring device.
Upon receiving the second request data, the wireless circuit unit deletes the first battery information for which communication has been established from the transmission buffer, and transmits the second battery information in the transmission buffer to the control device. The battery management system according to claim 2. When the control device receives the response data including the first battery information with respect to the first request data but a reception error occurs, the second request data does not include the information indicating the establishment of communication. To the monitoring device
When the wireless circuit unit receives the second request data, the wireless circuit unit transmits the second battery information in the transmission buffer to the control device while holding the first battery information in the transmission buffer without deleting it. The battery management system according to claim 2. The battery management system according to any one of claims 1 to 4, wherein when the transmission buffer is full, the wireless circuit unit deletes all the data in the transmission buffer. The battery management system according to any one of claims 1 to 4, wherein when the data that can be transmitted is exceeded within one cycle, the wireless circuit unit deletes all the data stored in the transmission buffer. The periodic data requests the monitoring device to acquire and transmit the battery information.
The battery management system according to any one of claims 1 to 6, wherein the monitoring unit acquires the battery information in response to the acquisition request.

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