Battery pack, battery monitoring device, and vehicle
An assembled battery is constituted of a plurality of battery blocks connected in series, each battery block including a plurality of cells. SBMs are provided corresponding to the battery blocks, respectively. Each of the SBMs is configured to monitor at least one of a voltage of each cell included in a corresponding battery block, and a voltage of the corresponding battery block. A total voltage monitoring circuit is configured to monitor the total voltage of the assembled battery, separately from the SBMs.
1. A battery pack comprising:
an assembled battery that includes a plurality of battery blocks connected in series, each of the plurality of battery blocks including a plurality of cells;
a plurality of monitoring modules provided corresponding to the plurality of battery blocks, each of the plurality of monitoring modules monitoring at least one of a voltage of each cell included in a corresponding battery block, and a voltage of the corresponding battery block;
a total voltage monitoring device that monitors a total voltage of the assembled battery, separately from the plurality of monitoring modules; and
a control device that receives a voltage monitoring result obtained by each of the plurality of monitoring modules, and receives a monitoring result of the total voltage obtained by the total voltage monitoring device, wherein
the control device calculates, when any of the plurality of monitoring modules is failed, the voltage of a battery block corresponding to the failed monitoring module, based on the voltage monitoring result obtained by each of remaining monitoring modules and the monitoring result of the total voltage.
2. The battery pack according to claim 1 , wherein
each of the plurality of monitoring modules includes a transmitting device that transmits the voltage monitoring result to the control device,
the control device includes a receiving device that receives the voltage monitoring result from each of the plurality of monitoring modules, and
the transmitting device and the receiving device communicate with each other wirelessly.
3. The battery pack according to claim 1 , wherein
the plurality of monitoring modules constitute a daisy chain that performs bidirectional communication,
each of the plurality of monitoring modules transmits the voltage monitoring result to an adjacent monitoring module, and
two monitoring modules at ends of the daisy chain among the plurality of monitoring modules communicate with the control device.
4. The battery pack according to claim 1 , wherein each of the plurality of monitoring modules includes
a cell monitoring device that monitors the voltage of each cell included in the corresponding battery block,
a block monitoring device that monitors the voltage of the corresponding battery block, and
a transmitting device that transmits a monitoring result obtained by the cell monitoring device and a monitoring result obtained by the block monitoring device to the control device.
5. A vehicle comprising:
the battery pack according to claim 1 ; and
an electric motor that generates a driving force for travel by receiving electric power from the battery pack.
6. A battery monitoring device that monitors an assembled battery constituted of a plurality of battery blocks connected in series, each of the plurality of battery blocks including a plurality of cells, the battery monitoring device comprising:
a plurality of monitoring modules provided corresponding to the plurality of battery blocks, each of the plurality of monitoring modules monitoring at least one of a voltage of each cell included in a corresponding battery block, and a voltage of the corresponding battery block;
a voltage sensor that monitors a voltage of the assembled battery in an electrical device that receives electric power from the assembled battery; and
a control device that receives a voltage monitoring result obtained by each of the plurality of monitoring modules, and receives a monitoring result of the voltage of the assembled battery obtained by the voltage sensor, wherein
the control device calculates, when any of the plurality of monitoring modules is failed, the voltage of a battery block corresponding to the failed monitoring module, based on the voltage monitoring result obtained by each of remaining monitoring modules and the monitoring result of the voltage of the assembled battery.
7. A vehicle comprising:
an assembled battery that includes a plurality of battery blocks connected in series, each of the plurality of battery blocks including a plurality of cells;
the battery monitoring device according to claim 6 , that monitors the assembled battery; and
an electric motor that generates a driving force for travel by receiving electric power from the assembled battery.