Voltage measurement device
AssigneeNuvoton Technology Corporation Japan
InventorsNaohisa Hatani, Goro Mori
Life of this patent
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Abstract
A voltage measurement device includes a first measurement circuit that measures voltage between both ends of a busbar, a second measurement circuit that measures voltage between both ends of each of a plurality of first battery cells and a plurality of second battery cells, and a correction circuit that corrects a measurement value measured by the second measurement circuit. The second measurement circuit is connected to the plurality of first battery cells, the busbar, and the plurality of second battery cells via the plurality of second RC filters. The correction circuit corrects a measurement value measured by the second measurement circuit using a measurement value of voltage between both ends of the busbar measured by the first measurement circuit.
Claims22
A voltage measurement device for use in a battery module system, the battery module system including:
- a first battery module including a plurality of first battery cells connected in series;
- a busbar connected in series with the first battery module, the busbar comprising a resistance;
- a second battery module connected in series with the first battery module via the busbar and including a plurality of second battery cells connected in series;
- and
- a plurality of first RC filters and a plurality of second RC filters connected to at least one of the first battery module, the busbar, or the second battery module, the voltage measurement device comprising:
- a first measurement circuit that measures voltage between both ends of the busbar;
- a second measurement circuit that measures voltage between both ends of each of the plurality of first battery cells and the plurality of second battery cells;
- and
- a correction circuit that corrects a measurement value measured by the second measurement circuit, wherein
- the second measurement circuit is connected to the plurality of first battery cells, the busbar, and the plurality of second battery cells via the plurality of second RC filters, and
- the correction circuit corrects a measurement value measured by the second measurement circuit using a measurement value of voltage between both ends of the busbar measured by the first measurement circuit.
A voltage measurement device for use in a battery module system, the battery module system including:
- a first battery module including a plurality of first battery cells connected in series;
- a busbar connected in series with the first battery module, the busbar comprising a resistance;
- a second battery module connected in series with the first battery module via the busbar and including a plurality of second battery cells connected in series;
- and
- a plurality of first RC filters and a plurality of second RC filters connected to at least one of the first battery module, the busbar, or the second battery module, the voltage measurement device comprising:
- a first measurement circuit that measures voltage between both ends of each of the plurality of first battery cells, the busbar, and the plurality of second battery cells;
- a second measurement circuit that measures voltage between both ends of each of the plurality of first battery cells, the busbar, and the plurality of second battery cells;
- and
- a correction circuit that corrects a measurement value measured by the first measurement circuit, wherein
- a different one of the plurality of first RC filters is connected to each of anodes of the plurality of first battery cells and the plurality of second battery cells and each of connection points between the busbar and the first battery module,
- a different one of the plurality of second RC filters is connected to each of cathodes of the plurality of first battery cells and the plurality of second battery cells and each of connection points between the busbar and the second battery module,
- the first measurement circuit is connected to the plurality of first battery cells, the busbar, and the plurality of second battery cells via the plurality of first RC filters, and
- the correction circuit corrects a measurement value measured by the first measurement circuit using a measurement value of voltage between both ends of the busbar measured by the first measurement circuit.
Dependencies are inferred from the claim text.