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US 12,614,915 B2Granted
Energy storage apparatus and charge/discharge control method
AssigneeMurata Manufacturing Co., Ltd.
InventorsJusuke Shimura, Michiya Mori
Life of this patent
Estimating the term…
Abstract
An energy storage apparatus includes a plurality of secondary batteries each including a negative electrode including crystalline carbon; and a charge/discharge control unit that controls charge/discharge of the plurality of secondary batteries so that a state of charge does not fall within a range of 50% or more and 70% or less.
Claims6
An energy storage apparatus comprising:
- an external input/output unit;
- a first battery module electrically connected to the external input/output unit and comprising a plurality of secondary batteries including a negative electrode including graphite;
- and
- a second battery module electrically connected in parallel with the first battery module relative to the external input/output unit and comprising a plurality of secondary batteries including a negative electrode including graphite;
- and
- a charge/discharge control unit that is configured to control charge/discharge of the plurality of secondary batteries so that a state of charge of the secondary batteries included in the first battery module falls within a range of 0% or more and less than 50%, and the state of charge of the secondary batteries included in the second battery module falls within a range of more than 70% and 100% or less, wherein
- the charge/discharge control unit comprises a first bidirectional voltage conversion unit and a second bidirectional voltage conversion unit,
- the first bidirectional voltage conversion unit is connected in series between the external input/output unit and the first battery module, and performs voltage conversion between the voltage of the first battery module and the voltage of the external input/output unit,
- the second bidirectional voltage conversion unit is connected electrically in parallel with the first bidirectional voltage conversion unit relative to the external input/output unit, and is connected in series between the external input/output unit and the second battery module, and performs voltage conversion between the voltage of the second battery module and the voltage of the external input/output unit, and
- the charge/discharge control unit is configured to control the charge/discharge of the plurality of secondary batteries such that a stage structure of the graphite included in the plurality of secondary batteries in the first battery module is in a state of stage 2 or more, and a stage structure of the graphite included in the plurality of secondary batteries in the second battery module is in a state of stage 1.
7 more elements
A charge/discharge control method comprising:
- calculating charge states of a plurality of secondary batteries including a negative electrode including graphite;
- controlling charge/discharge of the plurality of secondary batteries so that the states of charge of the plurality of secondary batteries of the secondary batteries included in a first battery module falls within a range of 0% or more and less than 50%, and the state of charge of the secondary batteries included in a second battery module falls within a range of more than 70% and 100% or less, wherein the first battery module is electrically connected to an external input/output unit, and the second battery module is electrically connected in parallel with the first battery module relative to the external input/output unit;
- performing, by a first bidirectional voltage conversion unit, voltage conversion between the voltage of the first battery module and the voltage of the external input/output unit, wherein the first bidirectional voltage conversion unit is connected in series between the external input/output unit and the first battery module,
- performing, by a second bidirectional voltage conversion unit, voltage conversion between the voltage of the second battery module and the voltage of the external input/output unit, wherein the second bidirectional voltage conversion unit is connected electrically in parallel with the first bidirectional voltage conversion unit relative to the external input/output unit, and is connected in series between the external input/output unit and the second battery module, and
- controlling the charge/discharge of the plurality of secondary batteries such that a stage structure of the graphite included in the plurality of secondary batteries in the first battery module is in a state of stage 2 or more, and a stage structure of the graphite included in the plurality of secondary batteries in the second battery module is in a state of stage 1.
2 more elements
Dependencies are inferred from the claim text.