A battery system controller is provided which is used for a battery system including a generator, electrical loads, a lead storage battery, a high performance storage battery which has higher-power and higher-energy density, and an opening and closing switch which switches the generator and the lead storage battery, and the high performance storage battery to an electrically conducting state or an interrupted state, a terminal voltage of the high performance storage battery being controlled so as to be lower than a terminal voltage of the lead storage battery. The battery system controller includes a control unit which allows the opening and closing switch to switch from an electrically conducting state to an interrupted state on the condition that charging current flowing to the high performance storage battery is smaller than a determination value, the larger an internal resistance of the lead storage battery, the smaller the determination value is set.

Battery system controller

The power supply unit includes a lead secondary battery (first battery) that is capable of being charged with power generated by an alternator (power generator); a lithium secondary battery (second battery) that is electrically connected in parallel to the lead secondary battery, capable of being charged with power generated by the alternator (power generator), and has higher output density or higher energy density than the lead secondary battery; and a switching means that is electrically connected between the alternator and the lead secondary battery, and the lithium secondary battery, and switches between conduction and blocking. The switching means is configured by a plurality of MOS-FETs (semiconductor switches) being connected in series such that respective parasitic diodes present in the semiconductor switches face opposite directions.

Power supply unit having plurality of secondary batteries

A 12 volt automotive battery system includes a first battery coupled to an electrical system, in which the first battery includes a first battery chemistry. The first battery is charged with a relatively constant first voltage, in which an alternator outputs the relatively constant first voltage. The 12 volt automotive battery system further includes a second battery coupled in parallel with the first battery and selectively coupled to the electrical system via a DC/DC converter, in which the second battery includes a second battery chemistry that has a higher coulombic efficiency than the first battery chemistry. The DC/DC converter boosts the first voltage to a second voltage to charge the second battery during regenerative braking, in which the second voltage is higher than a maximum charging voltage of the first battery.

Semi-active architectures for batteries having two different chemistries

A regeneration control device of an electrically powered vehicle (10) includes a motor generator (16) which performs electric power regeneration by braking a driving wheel (12L,12R) of the electrically powered vehicle (10), and a battery (18) to which electric power regenerated by the motor generator (16) is supplied. Monitoring means includes at least one of charging rate detection means configured to detect a charging rate of the battery (18) and voltage value detection means configured to detect a voltage value of the battery (18). Control means (19) controls the electric power regeneration of the motor generator (16) according to at least one of the charging rate and the voltage value of the battery (18) detected by the monitoring means. The control means (19) is configured to decrease regenerative electric current of the motor generator (16) as at least one of the charging rate and the voltage value is increased.

Regeneration control device of electrically powered vehicle

Approaches for managing and maintaining a state of charge of an energy storage device by adjusting (biasing) responses to electrical grid operator commands to perform ancillary services are disclosed. In embodiments, methods and systems regulate a set point regulation in an energy system. In an embodiment, a method determines when the set point needs to be changed, calculates a new set point, and moves the output of the system from an old set point to the new set point at a defined ramp rate. The method then incorporates, as part of a set point algorithm, the capability to restore the energy storage device to a desirable state of charge (SOC). Embodiments implement Dynamic Bias, SOC and Signal Bias Range Maintaining, Operational Limits, and Fixed Signal Bias algorithms and perform Intelligent Algorithm Selection to manage and maintain the SOC of an energy storage device by biasing responses to grid operator commands.

Method and system for performance management of an energy storage device

A power source apparatus mounted to a vehicle is equipped with a lead-acid battery and a lithium battery. An open circuit voltage and an internal resistance of each of the batteries are determined to satisfy the following conditions (a1), (a2), and (a3): (a1) In the use range of SOC of the lead-acid battery and the use range of SOC of the lithium battery, there is an equal voltage point Vds at which the open circuit voltage V0 (Pb) of the lead-acid battery becomes equal to the open circuit voltage V0 (Li) of the lithium battery; (a2) The relationship of V0 (Li) > V0 (Pb) is satisfied in the upper limit side of the use range of SOC of the battery; and (a3) A terminal voltage Vc (Li) of the lithium battery is not more than a set voltage Vreg of a regulator when a maximum current flows in the lithium battery.

Power source apparatus for vehicle

A power system for a vehicle is provided having a generator, first and second batteries, which are connected to the generator, and a connection switch that is provided in a connecting line that connects the first and second batteries electrically and the first battery and electrically connecting the generator to the second battery and electrically separated from the same. The power system performs when the vehicle decelerates by the generator by regenerative generation. A terminal voltage of the first battery is made larger than that of the second battery. The power system further includes a first control means which brings the connection switch in an electrically connected state for applying an electrical charge during regenerative generation by the generator to both the first and the second battery, a discharge control device having a discharging state of the first monitors battery during regenerative generation, and a second control device that separates based on the discharging state of the first battery to the connection switch on.

Power system for a vehicle

A power supply system mounted in a vehicle. A rotary machine is connected to an output shaft of an internal-combustion engine of the vehicle, and has a power generation function, an engine start-up function, and an engine output assist function. A first secondary battery and a second secondary battery are each electrically connected in parallel with the rotary machine. A connection switch is provided along a connecting line electrically connecting the first and second secondary batteries, where the connection switch is configured to electrically connect and disconnect the second secondary battery and a parallel connection of the first secondary battery and the rotary machine. A switch controller is configured to disconnect the second secondary battery and the parallel connection by controlling the connection switch to a current cut-off state during the engine start-up and during engine output assist.

Vehicle-mounted power supply system

The device has MOSFETs (50, 60) electrically connected with a conductive path (5) between an alternator (10) and a lead-secondary battery (20) and with a lithium-secondary battery (30). A control device (80) controls the MOSFETs to bring a charging amount of the lithium battery near to a target charging amount during an operation period of an internal combustion engine. A variable adjustment unit variably adjusts the target charging amount based on a state variable that stands in relation with a regenerative charging condition and/or an unloading state of the lithium battery. The alternator is formed as a power generator.

Device for controlling battery system of vehicle, has variable adjustment unit for adjusting target charging amount based on state variable that stands in relation with regenerative charging condition and/or unloading state of battery

Shigenori Saito

Papers

Power source apparatus for vehicle

Power supply unit having plurality of secondary batteries

Power system for a vehicle

Vehicle-mounted power supply system

Device for controlling battery system of vehicle, has variable adjustment unit for adjusting target charging amount based on state variable that stands in relation with regenerative charging condition and/or unloading state of battery