Abstract:
An electrical storage system includes a main battery, an auxiliary battery, a bidirectional DC-DC converter and a controller. The bidirectional DC-DC converter is provided between the auxiliary battery and a power supply path from the main battery to a driving motor. The bidirectional DC-DC converter steps down an output voltage from the power supply path to the auxiliary battery, and steps up an output voltage from the auxiliary battery to the power supply path. The controller controls charging and discharging of the auxiliary battery. The controller, when an allowable output power of the main battery decreases and an electric power becomes insufficient for a required vehicle output, supplies an electric power to the power supply path by discharging the auxiliary battery by using the bidirectional DC-DC converter. The controller, when an allowable input power of the main battery decreases and a regenerated electric power generated by the driving motor is not entirely charged into the main battery, charges part of the regenerated electric power into the auxiliary battery by using the bidirectional DC-DC converter.
Abstract:
An electricity storage system includes an electricity storage device, a positive electrode line, a negative electrode line, a capacitor, at least two diodes, and a first intermediate line. The electricity storage device is able to supply power to a load. The electricity storage device includes at least two electricity storage groups connected in series. The electricity storage group includes at least two electricity storage elements connected in series. Each electricity storage element includes a current breaker. The capacitor is connected to the positive electrode line and the negative electrode line. At least two diodes are connected in series between the positive electrode line and the negative electrode line and are respectively connected in parallel to the electricity storage groups. The first intermediate line is connected between a first connection point and a second connection point. At the first connection point, the electricity storage groups are connected together. At the second connection point, the diodes are connected together.
Abstract:
A system for determining fixation of a relay has an electricity storage device, an electrical apparatus, a relay, a first insulation resistor, a second insulation resistor, a detection circuit, and a controller. When the relay is controlled to OFF, the controller determines, based on the voltage value detected by the detection circuit (the detected voltage value), whether or not the relay is fixed. When the detected voltage value is a voltage value that is obtained by dividing the reference voltage value by a combined resistance value and the reference resistance value, the controller determines that the relay is fixed. When the detected voltage value is a voltage value that is obtained by dividing the reference voltage value by the first resistance value and the reference resistance value, the controller determines that the relay is not fixed.
Abstract:
An electrical storage system includes a first relay, a second relay, a drive circuit configured to drive the first relay and the second relay, and a controller configured to control operation of the drive circuit. The first relay is provided in a positive electrode line that connects a positive electrode terminal of an electrical storage device to a load. The second relay is provided in a negative electrode line that connects a negative electrode terminal of the electrical storage device to the load. The first relay and the second relay are mechanically interlocked with each other. The drive circuit is configured to operate the first relay and the second relay. The drive circuit includes a coil, a plurality of switch elements, at least one sensor and a controller. The coil is configured to generate electromagnetic force upon reception of electric power supplied from a power supply. The first relay and the second relay are configured to be switched from a non-energized state to an energized state by the electromagnetic force. The plurality of switch elements are provided in a current path between the power supply and the coil and connected in series with each other. The at least one sensor is configured to change an output signal in response to an energized state or non-energized state of each of the plurality of switch elements. The controller is configured to control operation of the drive circuit. The controller is configured to output a control signal for setting one of the switch elements to the non-energized state and determine whether the one of the switch elements is in the energized state on the basis of the output signal of the at least one sensor.