Battery management system and battery management method

Abstract

To provide a battery management system that aligns timing of analog-digital conversion of measurement data such as voltages measured by a plurality of circuits.SOLUTION: The battery management system includes a plurality of measurement circuits, a communication circuit that communicates with each of the plurality of measurement circuits, and a battery manager that manages each of the plurality of batteries, wherein the battery manager acquires a return time for each of the plurality of measurement circuits, measures a communication delay time between each of the plurality of measurement circuits and the communication circuit for each of the plurality of measurement circuits on the basis of the return time, and aligns timing of analog-to-digital conversion of measurement data of at least one of a voltage and a current transmitted by each of the plurality of measurement circuits on the basis of the return time corresponding to each of the plurality of measurement circuits.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a battery management system and a battery management method. [Background technology]

[0002] In the battery management system (BMS) disclosed in Patent Document 1, multiple communication circuits mounted on battery cells (batteries) are daisy-chained to enable bidirectional communication and are managed by a battery manager (MCU). The BMS includes multiple monitoring circuits that monitor the voltages (cell voltages) of the multiple batteries, the currents (cell currents) flowing through the multiple batteries, and so on.

[0003] The multiple monitoring circuits are connected in a daisy chain. In order for the BMS to measure the remaining battery capacity and deterioration with high accuracy, it is desirable to synchronize the timing at which the multiple monitoring circuits start measuring the cell voltage and battery current.

[0004] However, because the communication path distances from the battery manager to each of the multiple daisy-chained monitoring circuits are different, even when the battery manager sends a measurement start signal for each monitoring circuit, such as a cell voltage, there is a different delay time before the measurement start signal reaches each monitoring circuit, resulting in a difference in the timing at which each monitoring circuit starts measuring cell voltage, etc.

[0005] Therefore, in the past, the delay time (ADC Delay) from when each monitoring circuit received the measurement start signal until when each monitoring circuit started measuring cell voltage, etc., that is, when each monitoring circuit started ADC (analog-to-digital conversion) operation, was set for each monitoring circuit, and the communication delay time when each monitoring circuit received the measurement start signal was measured in advance, making it possible to align the timing at which each monitoring circuit started measuring cell voltage, etc. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-076890 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the communication delay time from each monitoring circuit to the MCU can vary depending on the length of the cable wired in the communication path, the characteristics of the components around the communication path, etc. Therefore, even if the delay time until each monitoring circuit starts the analog-to-digital conversion operation is set for each monitoring circuit, the timing at which each monitoring circuit converts the measured data, such as cell voltage, may vary.

[0008] In consideration of the above circumstances, the present disclosure aims to provide a battery management system and a battery management method that align the timing of analog-to-digital conversion of voltages measured by multiple circuits. [Means for solving the problem]

[0009] In order to solve the above problems, the battery management system according to the present disclosure includes a plurality of measurement circuits that are daisy-chained in series via a serial communication line and measure at least one of the voltage and current of each of a plurality of batteries included in a battery pack; a communication circuit that is connected in a loop to the plurality of measurement circuits via the serial communication line and communicates with each of the plurality of measurement circuits; and a battery manager that manages each of the plurality of batteries, wherein the battery manager acquires, for each of the plurality of measurement circuits, a turn-around time for signals transmitted and received between each of the plurality of measurement circuits and the communication circuit, and measures, for each of the plurality of measurement circuits, a communication delay time between each of the plurality of measurement circuits and the communication circuit based on the acquired turn-around time, and aligns the timing at which each of the plurality of measurement circuits starts analog-to-digital conversion of at least one of the voltage and current based on the communication delay time corresponding to each of the plurality of measurement circuits.

[0010] In order to solve the above-mentioned problems, the battery management method according to the present disclosure is a battery management method executed by a battery management system including: a plurality of measurement circuits daisy-chained in series by a serial communication line, each measuring at least one of the voltage and current of a plurality of batteries included in a battery pack; a communication circuit connected in a loop to the plurality of measurement circuits by the serial communication line and communicating with each of the plurality of measurement circuits; and a battery manager that manages each of the plurality of batteries, wherein the battery manager acquires, for each of the plurality of measurement circuits, a turn-around time for a signal transmitted and received between each of the plurality of measurement circuits and the communication circuit; the battery manager transmits, to each of the plurality of measurement circuits, a measurement start signal indicating that each of the plurality of measurement circuits will start the measurement; each of the plurality of measurement circuits transmits measurement data, which measures at least one of the voltage and current, to the communication circuit based on the measurement start signal; and the battery manager aligns the timing at which each of the plurality of measurement circuits starts analog-to-digital conversion of at least one of the voltage and current, based on the turn-around time corresponding to each of the plurality of measurement circuits. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a configuration diagram of a battery management system 100 according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a flowchart for explaining the operation of the battery management system 100 according to the embodiment of the present disclosure. [Figure 3] FIG. 3 is a diagram for explaining the operation of the battery management system 100 according to the embodiment of the present disclosure. [Figure 4] FIG. 4 is a block diagram showing the hardware configuration of the computer 300. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0013] (Embodiment) 1 is a configuration diagram of a battery management system 100 according to an embodiment of the present disclosure. The battery management system 100 may be interpreted as a circuit that monitors the voltage (cell voltage) of each of a plurality of batteries included in a battery pack 200, the current (cell current) flowing through each of the plurality of batteries, and the like. Each of the plurality of batteries may be interpreted as a battery cell, a battery stack including a plurality of battery cells therein, or a battery module including a plurality of battery stacks therein.

[0014] The battery management system 100 may include a communication system 10 , a battery manager 20 , and a network 30 .

[0015] (Network 30) The network 30 connects the battery manager 20 and the communication system 10. As an example, the network 30 may be a CAN (Controller Area Network).

[0016] (Communication System 10) The communication system 10 is communicatively connected to the battery manager 20 via a network 30. The communication system 10 may include a communication circuit 5 and a communication device group. The communication device group includes a plurality of communication devices, which may be interpreted as measurement circuits 1-1 to 1-n, measurement circuit 7, etc. The measurement circuits 1-1 to 1-n and measurement circuit 7 may each be realized by a computer equipped with a processor.

[0017] (Communication circuit 5) The communication circuit 5 may be connected in a loop to the plurality of measurement circuits 1-1 to 1-n via a serial communication line 6. The communication circuit 5 may perform bidirectional communication with each of the plurality of measurement circuits 1-1 to 1-n via the serial communication line 6. The communication circuit 5 may perform bidirectional communication with the battery manager 20 via a network 30. The communication circuit 5 may be realized by a computer having a processor.

[0018] (Measurement circuit 1-1 to 1-n) The multiple measurement circuits 1-1 to 1-n may be daisy-chained in series via a serial communication line 6. A daisy-chain may be interpreted as a connection configuration in which three or more circuits are connected by a cable for communication. In the following, for simplicity of explanation, unless otherwise specified, each of the multiple measurement circuits 1-1 to 1-n may be referred to as a measurement circuit 1.

[0019] Each of the plurality of measurement circuits 1 may measure at least one of the voltage and current of each of the plurality of batteries included in the battery pack 200. Specifically, upon receiving a measurement start signal Smeg from the communication circuit 5, each of the plurality of measurement circuits 1 may start analog-to-digital conversion of at least one of the voltage and current, and transmit the analog-to-digital converted at least one of the voltage and current to the battery manager 20 as measurement data.

[0020] Each of the plurality of measuring circuits 1 may monitor the state of each of the plurality of batteries included in the battery pack 200 and identify a battery in which a malfunction has occurred. Each of the plurality of measuring circuits 1 may set identification information for each of the plurality of measuring units 3-1 to 3-n to identify each of the plurality of measuring circuits 1. This makes it possible to identify the position of the battery being monitored by the plurality of measuring units 3-1 to 3-n, that is, the position of each of the plurality of batteries included in the battery pack 200. This also makes it possible for the battery manager 20 to identify the sender of the reception signal Srec.

[0021] The measuring circuit 1-1 may include a measuring unit 3-1 and a communication unit 4-1. Similarly, the measuring circuit 1-2 may include a measuring unit 3-2 and a communication unit 4-2, the measuring circuit 1-3 may include a measuring unit 3-3 and a communication unit 4-3, and the measuring circuit 1-n may include a measuring unit 3-n and a communication unit 4-n. Each of the measuring units 3-1 to 3-n may measure the voltage of the battery.

[0022] (Measurement section 3-1~Measurement section 3-n) Measuring unit 3-1 may measure the voltage generated across battery #1 and the current flowing through battery #1. Similarly, measuring unit 3-2 may measure the voltage generated across battery #2 and the current flowing through battery #2. Measuring unit 3-3 may measure the voltage generated across battery #3 and the current flowing through battery #3. Measuring unit 3-n may measure the voltage generated across battery #n and the current flowing through battery #n.

[0023] (Communications Department 4-1 to 4-n)

[0024] The communication unit 4-1 is connected to the adjacent communication unit 4-2 so as to be able to communicate with each other. Similarly, the communication unit 4-2 is connected to the adjacent communication unit 4-3 so as to be able to communicate with each other. The communication unit 4-n is connected to an adjacent communication unit (not shown) so as to be able to communicate with each other. In this way, a daisy chain is formed by connecting the adjacent communication units 4-1 to 4-n.

[0025] A serial communication line 6 is connected to the measurement circuit 1-1 that constitutes one end of the daisy chain, and a serial communication line 6 is also connected to the measurement circuit 1-n that constitutes the other end of the daisy chain. As a result, the communication units 4-1 to 4-n and the communication circuit 5 are connected in a loop by the serial communication line 6.

[0026] The communication unit 4-1 may transmit measurement data indicating values ​​such as voltage and current measured by the measurement unit 3-1 to the communication circuit 5. Similarly, the communication unit 4-2 may transmit measurement data measured by the measurement unit 3-2 to the communication circuit 5. The communication unit 4-3 may transmit measurement data measured by the measurement unit 3-3 to the communication circuit 5. The communication unit 4-n may transmit measurement data measured by the measurement unit 3-n to the communication circuit 5.

[0027] Each of the multiple measuring circuits 1 configured in this manner starts measuring at least one of the voltage and current when it receives a measurement start signal Smeg from the communication circuit 5 indicating that it should start measuring at least one of the voltage and current.

[0028] (Measurement circuit 7) The measurement circuit 7 may measure the current flowing through the battery pack 200 and transmit to the communication circuit 5 measurement data indicating the value of the measured current.

[0029] (Battery Manager 20) The battery manager 20 may manage each of the multiple batteries included in the battery pack 200. Specifically, the battery manager 20 may request measurement of at least one of the voltage and current of each of the multiple batteries included in the battery pack 200, collect measurement data in response to the request, and perform various controls based on the collected measurement data.

[0030] Specifically, the battery manager 20 may acquire, for each of the plurality of measurement circuits 1, the turn-around time Rt of the signal transmitted and received between each of the plurality of measurement circuits 1 and the communication circuit 5. When there are a plurality of measurement circuits 7, the battery manager 20 may similarly acquire the turn-around time Rt between the plurality of measurement circuits 7.

[0031] The battery manager 20 may transmit, via the communication circuit 5, to each of the plurality of measuring circuits 1, a measurement start signal Smeg indicating that each of the plurality of measuring circuits 1 should start measurement.

[0032] The battery manager 20 may measure the communication delay time based on the turnaround time Rt. Specifically, the battery manager 20 may measure the communication delay time between each of the plurality of measurement circuits 1 and the communication circuit 5 for each of the plurality of measurement circuits 1. If there are a plurality of measurement circuits 7, the communication circuit 5 may similarly measure the communication delay time between each of the plurality of measurement circuits 7.

[0033] The return time Rt may be interpreted as the time from when the communication circuit 5 transmits a specific signal to each of the multiple measurement circuits 1 in a specific direction of the serial communication line 6 until the communication circuit 5 receives a signal indicating that each of the multiple measurement circuits 1-1 to 1-n has received the signal.

[0034] Specifically, the turn-back time Rt may be interpreted as the time from when the communication circuit 5 transmits a turn-back request signal Sreq to each of the multiple measurement circuits 1 in a specific direction of the serial communication line 6 to when the communication circuit 5 receives a reception signal Srec indicating that each of the multiple measurement circuits 1 has received the turn-back request signal Sreq, as a result of each of the multiple measurement circuits 1 transmitting the reception signal Srec in the direction opposite to the specific direction.

[0035] The specific direction may be interpreted as either a first direction or a second direction around the serial communication line 6. Specifically, when multiple measurement circuits 1-1 to 1-n are daisy-chain-connected to the serial communication line 6 in the order of measurement circuit 1-1, measurement circuit 1-2, measurement circuit 1-n, and communication circuit 5, the first direction around the serial communication line 6 may be interpreted as the direction in which communication circuit 5, measurement circuit 1-1, measurement circuit 1-2, measurement circuit 1-n, and communication circuit 5 are arranged in this order. The second direction around the serial communication line 6 may be interpreted as the direction opposite to the first direction. When the specific direction is a first direction, the direction opposite to the specific direction may be interpreted as a second direction. In the present disclosure, the configuration and operation of the communication system 10 will be described assuming that the specific direction of the serial communication line 6 is a first direction.

[0036] The battery manager 20 may synchronize the timing at which each of the plurality of measurement circuits 1 starts analog-to-digital conversion of at least one of the voltage and the current, based on the turnaround time Rt corresponding to each of the plurality of measurement circuits 1.

[0037] Specifically, if the communication time between the battery manager 20 and the measurement circuit 1-1, i.e., the turnaround time Rt, is X1, then half of X1 is the communication delay time (td1) from when the measurement circuit 1-1 starts measuring the voltage or the like until the battery manager 20 or the communication circuit 5 receives the measurement data. The battery manager 20 transmits a measurement start signal Smeg to the measurement circuit 1-1 at a time after the communication delay time (td1) has elapsed from a specific time (T). The communication delay time (td1) is, for example, 10 msec. When transmitting the measurement start signal Smeg to the measurement circuit 1-1, the battery manager 20 may receive identification information that identifies the measurement circuit 1-1 from the measurement circuit 1-1 and transmit the measurement start signal Smeg to the measurement circuit 1-1 based on this identification information. In addition, the battery manager 20 may transmit information indicating the communication delay time (td1) to the measurement circuit 1-1, and the measurement circuit 1-1, upon receiving the information, may start analog-to-digital conversion at a time after the communication delay time (td1) has elapsed from a specific time (T).

[0038] If the turnaround time Rt between the battery manager 20 and the measurement circuit 1-2 is X2, half of X2 is the communication delay time (td2) from when the measurement circuit 1-2 starts measuring voltage or the like until the battery manager 20 or the communication circuit 5 receives the measurement data. The battery manager 20 transmits a measurement start signal Smeg to the measurement circuit 1-2 after the communication delay time (td2) has elapsed since a specific time (T). The communication delay time (td2) is shorter than the communication delay time (td1), for example, 9 msec. The battery manager 20 may transmit information indicating the communication delay time (td2) to the measurement circuit 1-2, and the measurement circuit 1-2, having received the information, may start analog-to-digital conversion after the communication delay time (td2) has elapsed since the specific time (T).

[0039] If the turnaround time Rt between the battery manager 20 and the measurement circuit 1-3 is X3, half of X3 is the communication delay time (td3) from when the measurement circuit 1-3 starts measuring voltage or the like until the battery manager 20 or the communication circuit 5 receives the measurement data. The battery manager 20 transmits a measurement start signal Smeg to the measurement circuit 1-3 after the communication delay time (td3) has elapsed since a specific time (T). The communication delay time (td3) is shorter than the communication delay time (td2), for example, 8 msec. The battery manager 20 may transmit information indicating the communication delay time (td3) to the measurement circuit 1-3, and the measurement circuit 1-3, having received the information, may start analog-to-digital conversion after the communication delay time (td3) has elapsed since the specific time (T).

[0040] In this way, the battery manager 20 measures the communication delay times (td1, td2, td3, etc.) and, taking these communication delay times into consideration, transmits the measurement start signal Smeg at appropriate timing to each of the multiple measurement circuits 1. This allows the multiple measurement circuits 1 to synchronize the timing at which they perform analog-to-digital conversion of at least one of the voltage and the current.

[0041] Next, the operation of the battery management system 100 will be described with reference to Figures 2 and 3. Figure 2 is a flowchart for explaining the operation of the battery management system 100 according to an embodiment of the present disclosure. Figure 3 is a diagram for explaining the operation of the battery management system 100 according to an embodiment of the present disclosure.

[0042] In step S1, the battery manager 20 obtains the turn-around time Rt.

[0043] 3, the battery manager 20 has the communication circuit 5 transmit a return request signal Sreq to each of the plurality of measurement circuits 1 in a specific direction (first direction around D1) of the serial communication line 6. Each of the plurality of measurement circuits 1 transmits a reception signal Srec in the opposite direction (second direction around D2) to the specific direction. The battery manager 20 can acquire the return time Rt by measuring the time from the transmission of the return request signal Sreq to the time the battery manager 20 receives the reception signal Srec.

[0044] In step S2, the battery manager 20 measures the communication delay time (td1, td2, td3, tdn) between each of the plurality of measurement circuits 1 and the communication circuit 5 based on the turnaround time Rt for each of the plurality of measurement circuits.

[0045] In step S3, the battery manager 20 transmits a measurement start signal Smeg to each of the multiple measurement circuits 1 based on the communication delay time (td1, td2, td3, tdn) corresponding to each of the multiple measurement circuits 1 so that the timing at which the multiple measurement circuits 1 start measuring at least one of the voltage and current is synchronized.

[0046] In step S4, each of the measurement circuits 1 that has received the measurement start signal Smeg starts measuring at least one of the voltage and the current at the timing of receiving the measurement start signal Smeg. That is, it starts analog-to-digital conversion of at least one of the voltage and the current. The analog-to-digital converted voltage and / or current is transmitted to the battery manager 20 as measurement data.

[0047] 4 is a block diagram showing the hardware configuration of the computer 300. The computer 300 may be interpreted as the battery manager 20.

[0048] The computer 300 may include a CPU (Central Processing Unit) 11 and a memory 12. The CPU 11 and the memory 12 are connected via a bus 20 so as to be able to communicate with each other.

[0049] The CPU 11 is a central processing unit that executes various programs and controls each part. The memory 12 stores various programs 30A and various data. The memory 12 temporarily stores programs or data as a working area. The programs 30A may include a battery management program.

[0050] In the above embodiment, the control processing executed by the CPU 11 after reading the software (program) may be executed by various processors other than a CPU. Examples of such processors include programmable logic devices (PLDs) such as field-programmable gate arrays (FPGAs), whose circuit configuration can be changed after fabrication, and dedicated electrical circuits such as application-specific integrated circuits (ASICs), which are processors with circuit configurations specifically designed to execute specific processing. The control processing may be executed by one of these processors, or by a combination of two or more processors of the same or different types (e.g., multiple FPGAs, or a combination of a CPU and an FPGA). The hardware structure of these processors is, more specifically, an electrical circuit that combines circuit elements such as semiconductor devices.

[0051] (Action, effect) As described above, the battery management system 100 of the present disclosure adjusts the timing of transmitting the measurement start signal Smeg so that the timing of analog-to-digital conversion of at least one of the voltage and current by each of the multiple measurement circuits 1 is synchronized based on the communication delay time corresponding to each of the multiple measurement circuits 1. As a result, even if the communication delay time from each of the monitoring circuits to the MCU can vary depending on the length of the cable laid in the communication path and the characteristics of the components present around the communication path, it is possible to improve the synchronization of voltage and current measurements, i.e., synchronize the timing of analog-to-digital conversion, compared to the conventional method of measuring the communication delay time in advance.

[0052] In addition, the following supplementary notes are provided in relation to the above description.

[0053] (Appendix 1) a plurality of measurement circuits that are daisy-chained in series by serial communication lines and measure at least one of the voltage and current of each of the plurality of batteries included in the battery pack; a communication circuit connected to the plurality of measurement circuits in a loop by the serial communication line and communicating with each of the plurality of measurement circuits; a battery manager that manages each of the plurality of batteries; Equipped with The battery manager acquiring, for each of the plurality of measurement circuits, a turnaround time of a signal transmitted and received between each of the plurality of measurement circuits and the communication circuit; measuring a communication delay time between each of the plurality of measurement circuits and the communication circuit based on the acquired return time; A battery management system that aligns the timing at which each of the plurality of measurement circuits performs analog-to-digital conversion of at least one of the voltage and the current based on the communication delay time corresponding to each of the plurality of measurement circuits.

[0054] (Appendix 2) The battery management system of claim 1, wherein the turn-back time is the time from when the communication circuit transmits a turn-back request signal to each of the plurality of measurement circuits in a specific direction of the serial communication line to when each of the plurality of measurement circuits transmits a received signal indicating that it has received the turn-back request signal in a direction opposite to the specific direction, and the communication circuit receives the received signal.

[0055] (Appendix 3) 3. The battery management system of claim 2, wherein the specific direction is either around a first direction or around a second direction of the serial communication line.

[0056] (Appendix 4) The battery management system of any one of appendices 1 to 3, wherein the battery manager transmits a measurement start signal indicating that each of the plurality of measurement circuits should start measuring at least one of voltage and current based on the communication delay time corresponding to each of the plurality of measurement circuits.

[0057] (Appendix 5) A battery management method executed by a battery management system including: a plurality of measurement circuits that are daisy-chained in series by serial communication lines and measure at least one of the voltage and current of each of a plurality of batteries included in an assembled battery; a communication circuit that is loop-connected to the plurality of measurement circuits by the serial communication lines and communicates with each of the plurality of measurement circuits; and a battery manager that manages each of the plurality of batteries, the battery manager acquires, for each of the plurality of measurement circuits, a turnaround time of a signal transmitted and received between each of the plurality of measurement circuits and the communication circuit; the battery manager transmitting a measurement start signal to each of the plurality of measurement circuits indicating that each of the plurality of measurement circuits should start the measurement; each of the plurality of measurement circuits transmits measurement data obtained by measuring at least one of the voltage and the current to the communication circuit based on the measurement start signal; The battery manager aligns the timing of analog-to-digital conversion of the measurement data transmitted by each of the plurality of measurement circuits based on the turnaround time corresponding to each of the plurality of measurement circuits. [Explanation of symbols]

[0058] 1, 1-1, 1-2, 1-3, 1-n measurement circuit 3-1, 3-2, 3-3, 3-n Communications Department 4-1, 4-2, 4-3, 4-n Communications Department 5. Communication Circuits 6 serial communication lines 7 Measurement circuit 10. Communication Systems 11 CPU 12 Memory 20 Bus 20 Battery Manager 30 Network 30A Program 100 Battery Management System 200 battery packs 300 Computers

Claims

1. a plurality of measurement circuits that are daisy-chained in series by serial communication lines and measure at least one of the voltage and current of each of the plurality of batteries included in the battery pack; a communication circuit connected to the plurality of measurement circuits in a loop by the serial communication line and communicating with each of the plurality of measurement circuits; a battery manager that manages each of the plurality of batteries; Equipped with The battery manager acquiring, for each of the plurality of measurement circuits, a turnaround time of a signal transmitted and received between each of the plurality of measurement circuits and the communication circuit; measuring a communication delay time between each of the plurality of measurement circuits and the communication circuit based on the acquired return time; A battery management system that synchronizes the timing at which each of the plurality of measurement circuits starts analog-to-digital conversion of at least one of the voltage and current based on the communication delay time corresponding to each of the plurality of measurement circuits.

2. 2. The battery management system of claim 1, wherein the turn-back time is a time period from when the communication circuit transmits a turn-back request signal to each of the plurality of measurement circuits in a specific direction of the serial communication line to when each of the plurality of measurement circuits transmits a received signal indicating that the communication circuit has received the turn-back request signal in a direction opposite to the specific direction, and when the communication circuit receives the received signal.

3. 3. The battery management system according to claim 2, wherein the specific direction is either around a first direction or around a second direction of the serial communication line.

4. 2. The battery management system of claim 1, wherein the battery manager transmits a measurement start signal indicating that each of the plurality of measurement circuits should start measuring at least one of voltage and current based on the communication delay time corresponding to each of the plurality of measurement circuits.

5. A battery management method executed by a battery management system including: a plurality of measurement circuits that are daisy-chained in series by serial communication lines and measure at least one of the voltage and current of each of a plurality of batteries included in an assembled battery; a communication circuit that is loop-connected to the plurality of measurement circuits by the serial communication lines and communicates with each of the plurality of measurement circuits; and a battery manager that manages each of the plurality of batteries, the battery manager acquires, for each of the plurality of measurement circuits, a turnaround time of a signal transmitted and received between each of the plurality of measurement circuits and the communication circuit; the battery manager measures a communication delay time between each of the plurality of measurement circuits and the communication circuit based on the acquired turnaround time; A battery management method in which the battery manager aligns the timing at which each of the multiple measurement circuits performs analog-to-digital conversion of at least one of the voltage and current based on the communication delay time corresponding to each of the multiple measurement circuits.

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