Secondary battery state detection device and secondary battery state detection method
First Claim
1. A secondary battery state detecting device detecting a state of a secondary battery mounted on a vehicle, comprising:
- a measurement unit measuring a first value of an internal resistance of the secondary battery at an engine stop time;
a storage unit storing a data structure or a relational expression that comprises information indicating a temporal change of diffusion resistance resulting from diffusion of an ion generated in an electrolytic solution of the secondary battery with respect to a plurality of discharge current values associated with a plurality of discharge time values;
an estimation unit estimating, by applying different discharge currents and different discharge times at past plural starting times of the engine to the data structure or the relational expression, a second value of the diffusion resistance resulting from the diffusion of the ion generated in the electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine, wherein the data structure or the relational expression stores different values of the diffusion resistance corresponding to the different discharge times; and
a calculation unit calculating a starting voltage being a voltage required for the starting of the engine from a resistance value obtained by adding the second value of the diffusion resistance estimated by the estimation unit to the first value of the internal resistance measured by the measurement unit, a starting current flowing when the engine is started, and a voltage before starting of the secondary battery.
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Abstract
To accurately determine whether an engine can be started while accurately detecting a degree of deterioration of a secondary battery, in a secondary battery state detecting device detecting a state of a secondary battery mounted on a vehicle, a measurement unit measures a value of an internal resistance of the secondary battery at an engine stop time. An estimation unit estimates a value of a diffusion resistance resulting from diffusion of an ion generated at an electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine. A calculation unit calculates a starting voltage being a voltage for the starting of the engine from a resistance value obtained by adding the value of the diffusion resistance estimated by the estimation unit to the value of the internal resistance measured by the measurement unit.
5 Citations
13 Claims
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1. A secondary battery state detecting device detecting a state of a secondary battery mounted on a vehicle, comprising:
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a measurement unit measuring a first value of an internal resistance of the secondary battery at an engine stop time; a storage unit storing a data structure or a relational expression that comprises information indicating a temporal change of diffusion resistance resulting from diffusion of an ion generated in an electrolytic solution of the secondary battery with respect to a plurality of discharge current values associated with a plurality of discharge time values; an estimation unit estimating, by applying different discharge currents and different discharge times at past plural starting times of the engine to the data structure or the relational expression, a second value of the diffusion resistance resulting from the diffusion of the ion generated in the electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine, wherein the data structure or the relational expression stores different values of the diffusion resistance corresponding to the different discharge times; and a calculation unit calculating a starting voltage being a voltage required for the starting of the engine from a resistance value obtained by adding the second value of the diffusion resistance estimated by the estimation unit to the first value of the internal resistance measured by the measurement unit, a starting current flowing when the engine is started, and a voltage before starting of the secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A secondary battery state detecting method detecting a state of a secondary battery mounted on a vehicle, comprising:
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a measurement step measuring a first value of an internal resistance of the secondary battery at an engine stop time; a storage step storing a data structure or a relational expression that comprises information indicating a temporal change of diffusion resistance resulting from diffusion of an ion generated in an electrolytic solution of the secondary battery with respect to a plurality of discharge current values associated with a plurality of discharge time values; an estimation step estimating, by applying different discharge currents and different discharge times at past plural starting times of the engine to the data structure or the relational expression, a second value of the diffusion resistance resulting from the diffusion of the ion generated in the electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine, wherein the data structure or the relational expression stores different values of the diffusion resistance corresponding to the different discharge times; and a calculation step calculating a starting voltage being a voltage required for the starting of the engine from a resistance value obtained by adding the second value of the diffusion resistance estimated at the estimation step to the first value of the internal resistance measured at the measurement step, a starting current flowing when the engine is started, and a voltage before starting of the secondary battery.
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13. A secondary battery state detecting device for detecting a state of a secondary battery mounted on a vehicle, comprising:
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one or more processors; one or more memory modules communicatively coupled to the one or more processors; and machine readable instructions stored in the one or more memory modules that cause the secondary battery state detecting device to perform at least the following when executed by the one or more processors; a measurement unit for measuring a first value of an internal resistance of the secondary battery at an engine stop time; a storage unit for storing a data structure or a relational expression that comprises information indicating a temporal change of diffusion resistance resulting from diffusion of an ion generated in an electrolytic solution of the secondary battery with respect to a plurality of discharge current values associated with a plurality of discharge time values; an estimation unit for estimating, by applying different discharge currents and different discharge times at past plural starting times of the engine to the data structure or the relational expression, a second value of the diffusion resistance resulting from the diffusion of the ion generated in the electrolytic solution of the secondary battery by supplying electric power to a starter motor at a starting time of the engine, wherein the data structure or the relational expression stores different values of the diffusion resistance corresponding to the different discharge times; and a calculation unit for calculating a starting voltage being a voltage required for the starting of the engine from a resistance value obtained by adding the second value of the diffusion resistance estimated by the estimation unit to the first value of the internal resistance measured by the measurement unit, a starting current flowing when the engine is started, and a voltage before starting of the secondary battery.
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Specification