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 value of an internal resistance of the secondary battery at an engine stop time;
an estimation unit estimating 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; 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 value of the diffusion resistance estimated by the estimation unit to the 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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Accused Products
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.
11 Citations
5 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 value of an internal resistance of the secondary battery at an engine stop time; an estimation unit estimating 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; 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 value of the diffusion resistance estimated by the estimation unit to the 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)
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5. 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 value of an internal resistance of the secondary battery at an engine stop time; an estimation step estimating 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; 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 value of the diffusion resistance estimated at the estimation step to the 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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Specification