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

A vehicle that is chargeable using power from an external power source includes: a chargeable electric storage device; a charging device that charges the electric storage device by using the power from the external power source; and a control device that, based on maximum supply power that is able to be supplied to the electric storage device and based on actual charge power actually supplied to the electric storage device, calculates a shortfall with respect to charge power supplied to the electric storage device in a case where charging is performed at the maximum supply power, and stores information relating to a causal factor for the shortfall.

Vehicle and vehicle control method

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

PROBLEM TO BE SOLVED: To provide an in-vehicle power supply equipped with a high performance storage battery (the second storage battery) to prevent deterioration of a lead storage battery and reduce a cost, while eliminating a DC-DC converter which has been conventionally indispensable, to sufficiently reducing cost, and suppressing overdischarge or overcharge of a lead storage battery. SOLUTION: The in-vehicle power supply including the lead storage battery and the lithium storage battery connected in parallel includes: a MOS-FET (first switching means and rectifying means) electrically connecting or disconnecting a generator to/from the lithium storage battery, and a relay (second switching means) which is electrically connected between the MOS-FET and the lithium storage battery to supply or cut off power to the lithium storage battery. An operation state of both the switching means and setting voltage Vreg by a regulator are controlled so that SOC (Pb) and SOC (Li) are within proper ranges W1 and W2. COPYRIGHT: (C)2011,JPO&INPIT

In-vehicle power supply

PROBLEM TO BE SOLVED: To provide an in-vehicle power supply device achieved in sufficient cost reduction by eliminating a DC-DC converter which has been indispensable hitherto.SOLUTION: The in-vehicle power supply device comprises a lead battery electrically connected to an alternator, and a lithium battery (second battery) connected to the lead accumulator in parallel therewith, and sets the opening voltages and internal resistances of both the batteries so that the following conditions (a) to (c) are satisfied: condition (a): there is a point VdS at which the opening voltage V0 (Pb) of the lead battery and the opening voltage V0 (Li) of the lithium battery coincide with each other in an SOC use range W1 of the lead battery and an SOC use range W2 of the lithium battery exists; condition (b): an expression of V0(Li)>V0(Pb) is satisfied at the upper limit side of the coincident point VdS in the SOC use range W2; and condition (c): a terminal voltage Vc (Li) at the time when a maximum charging current flows to the lithium battery is lowered to a constant voltage Vreg (set voltage) generated by a regulator or lower.

In-vehicle power supply device

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

The device has an alternating current generator (10) driven by an output shaft of an internal combustion engine, and a lead secondary battery (20) connected parallel to a lithium secondary battery (30). MOSFETs (50, 60) are electrically connected with a conduction path between the generator and the batteries for switching the conduction path. A controller (11) limits increasing rate of power generation amount of the generator such that the power generation amount is increased when the conduction path is switched by the MOSFETs during driving of the engine.

Device for controlling battery system of vehicle, has controller limiting increasing rate of power generation amount of generator such that power generation amount is increased when conduction path is switched by MOSFETs

Takao Suenaga

Papers

Power source apparatus for vehicle

In-vehicle power supply

In-vehicle power supply device

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

Device for controlling battery system of vehicle, has controller limiting increasing rate of power generation amount of generator such that power generation amount is increased when conduction path is switched by MOSFETs