Lead acid battery device, control device for lead acid battery, and control method for lead acid battery

A lead acid battery device comprising:

• a lead acid battery;
• a charge control unit to charge the lead acid battery by alternately and repeatedly performing a high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• and
• an internal resistance calculation unit to calculate an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a condition in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied, wherein
• the charge control unit applies the pulsed high voltage or low voltage to the lead acid battery after changing a pulse width thereof from a first pulse width to a second pulse width,
• the internal resistance calculation unit calculates, before the changing of the pulse width, the internal resistance of the lead acid battery based on the voltage difference and the current difference between a timing at which a period of the first pulse width has elapsed since a switching timing from one of the low voltage charging and the high voltage charging to the other and a timing before the switching, and calculates, after the changing of the pulse width, the internal resistance of the lead acid battery based on the voltage difference and the current difference between a timing at which a period of the second pulse width has elapsed since the switching timing from one of the low voltage charging and the high voltage charging to the other and the timing before the switching.

A lead acid battery device comprising:

• a lead acid battery;
• a charge control unit to charge the lead acid battery by alternately and repeatedly performing high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• and
• an internal resistance calculation unit to calculate an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a period in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied, wherein
• in a case where the internal resistance calculation unit calculates the internal resistance, the charge control unit, when switching from the low voltage charging to the high voltage charging, applies the high voltage after causing a current of a predetermined value to flow from the lead acid battery to decrease a voltage of the lead acid battery to a level below the low voltage, and
• the internal resistance calculation unit calculates the internal resistance based on the voltage difference and the current difference between a period of the high voltage charging and a period in which the current of the predetermined value flows from the lead acid battery.

A control device for a lead acid battery, comprising:

• a charge control unit to charge a lead acid battery by alternately and repeatedly performing high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• and
• an internal resistance calculation unit to calculate an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a period in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied, wherein
• the internal resistance calculation unit calculates the internal resistance based on the voltage difference and the current difference between a timing at which a predetermined time has elapsed since a switching timing from one of the low voltage charging and the high voltage charging to the other and which is within a period in which an inter-terminal voltage of the lead acid battery is gradually increasing or gradually decreasing, and a timing before the switching.

A control device for a lead acid battery, comprising:

• a charge control unit to charge a lead acid battery by alternately and repeatedly performing high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• and
• an internal resistance calculation unit to calculate an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a period in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied, wherein
• in a case where the internal resistance calculation unit calculates the internal resistance, the charge control unit, when switching from the low voltage charging to the high voltage charging, applies the high voltage after causing a current of a predetermined value to flow from the lead acid battery to decrease a voltage of the lead acid battery to a level below the low voltage, and
• the internal resistance calculation unit calculates the internal resistance based on the voltage difference and the current difference between a period of the high voltage charging and a period in which the current of the predetermined value flows from the lead acid battery.

A control method for a lead acid battery comprising:

• charging a lead acid battery by alternately and repeatedly performing high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• and
• calculating an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a period in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied, wherein
• the calculating an internal resistance of the lead acid battery is to calculate the internal resistance based on the voltage difference and the current difference between a timing at which a predetermined time has elapsed since a switching timing from one of the low voltage charging and the high voltage charging to the other and which is within a period in which an inter-terminal voltage of the lead acid battery is gradually increasing or gradually decreasing, and a timing before the switching.

A control method comprising:

• charging a lead acid battery by alternately and repeatedly performing high voltage charging, in which a pulsed high voltage is applied to the lead acid battery, and low voltage charging, in which a low voltage lower than the high voltage is applied to the lead acid battery;
• calculating an internal resistance of the lead acid battery based on a voltage difference and a current difference of the lead acid battery between a period in which the pulsed high voltage is applied and a period in which the pulsed high voltage is not applied;
• and
• applying the pulsed high voltage or low voltage to the lead acid battery after changing a pulse width thereof from a first pulse width to a second pulse width, and calculating, before the changing of the pulse width, the internal resistance of the lead acid battery based on the voltage difference and the current difference between a timing at which a period of the first pulse width has elapsed since a switching timing from one of the low voltage charging and the high voltage charging to the other and a timing before the switching, and calculating, after the changing of the pulse width, the internal resistance of the lead acid battery based on the voltage difference and the current difference between a timing at which a period of the second pulse width has elapsed since the switching timing from one of the low voltage charging and the high voltage charging to the other and the timing before the switching.

A lead acid battery device comprising:

• a first lead acid battery,
• a first charge and discharge circuit to charge and discharge the first lead acid battery through a power supply line;
• an interrupting device to interrupt a connection between the first lead acid battery and the first charge and discharge circuit after the first lead acid battery is charged by the first charge and discharge circuit, if the other power storage device is capable of discharging to the power supply line;
• a measuring device to measure an open circuit voltage of the first lead acid battery when the connection between the first lead acid battery and the first charge and discharge circuit is interrupted by the interrupting device;
• and
• a connection control unit to connect the first lead acid battery to the first charge and discharge circuit when the open circuit voltage of the first lead acid battery drops to or below a predetermined voltage with the connection between the first lead acid battery and the first charge and discharge circuit being interrupted by the interrupting device.

A lead acid battery device comprising:

• a first lead acid battery,
• a first charge and discharge circuit to charge and discharge the first lead acid battery through a power supply line;
• an interrupting device to interrupt a connection between the first lead acid battery and the first charge and discharge circuit after the first lead acid battery is charged by the first charge and discharge circuit, if other power storage device is capable of discharging to the power supply line;
• and
• a measuring device to measure an open circuit voltage of the first lead acid battery when the connection between the first lead acid battery and the first charge and discharge circuit is interrupted by the interrupting device, wherein
• the interrupting device keeps the connection between the first lead acid battery and the first charge and discharge circuit interrupted for a predetermined time or more, and
• the first charge and discharge circuit:
• increases a charge amount of the first lead acid battery achieved after the first lead acid battery and the first charge and discharge circuit are connected, if an open circuit voltage after the predetermined time has elapsed since the interrupting device interrupts the connection between the first lead acid battery and the first charge and discharge circuit is less than a predetermined lower limit voltage;
• or
• decreases a charge amount of the first lead acid battery achieved after the first lead acid battery and the first charge and discharge circuit are connected, if an open circuit voltage after the predetermined time has elapsed since the interrupting device interrupts the connection between the first lead acid battery and the first charge and discharge circuit is more than a predetermined upper limit voltage.