Toyota Jidosha Kabushiki Kaisha

Yukinari Tanabe

Yuji Nishi

Hiromasa Tanaka

Keiji Kaita

Motoi Ito

Hiroyuki Kaiya

Yutaroh Gotoh

Yugo Mochizuki

Hiroki Tashiro

Masaru Takagi

Teruo Ishishita

Nobuyuki Yamazaki

Yuko Asano

Hironobu Kawashima

A power storage device is a power storage device provided on a lower surface of a floor panel of a vehicle, the power storage device including: a housing case; a power storage module housed in the housing case; and a cooler housed in the housing case to cool the power storage module, wherein the housing case includes a bottom plate, a refrigerant passage through which a refrigerant flows is formed in a portion of the housing case, the portion being located above the bottom plate, and the refrigerant passage is connected to the cooler.

Power storage device

A battery includes at least an electrode group including a positive electrode, a separator, a negative electrode, and a protection layer. The separator is interposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode current collector, a positive electrode mixture layer, and a positive electrode tab. The positive electrode mixture layer is disposed on a surface of the positive electrode current collector. The positive electrode tab is electrically connected to the positive electrode current collector. The protection layer covers a surface of the positive electrode tab. A volume resistivity of the protection layer is within a range of one to 100 times a volume resistivity of the positive electrode mixture layer.

Battery and manufacturing method of the same

An electricity storage system includes an electricity storage block including an electricity storage element for performing charging and discharging; a relay switched between an ON state in which the electric storage block is connected to a load and an OFF state in which a connection between the electricity storage block and the load is cut off; a controller for controlling the ON state and the OFF state of the relay; and a current cutoff circuit so as to cut off energization of the electricity storage block. The current cutoff circuit has an alarm circuit to indicate that the electricity storage block is in an overcharged state by comparing a voltage value of the electricity storage block and a threshold; a latch circuit retains the alarm signal; and a transistor receives an output signal of the latch circuit and switches the relay from the ON state to the OFF state.

Electricity storage system

An electrical storage system includes an electrical storage device (); a relay (SMR-B, SMR-G, SMR-P) switching between on/off states; a current interruption circuit () interrupting energization of the electrical storage device by causing the relay to switch from the on state to the off state; and a controller () executing drive control over the relay. The current interruption circuit includes an alarm circuit () outputting an alarm signal indicating overcharging/overdischarging of any one electrical storage block by comparing a voltage value of each electrical storage block with a threshold; a latch circuit () retaining the alarm signal; and a transistor () causing the relay to switch from the on state to the off state upon reception of an output signal of the latch circuit. The controller determines an energization state of the electrical storage device by executing control for turning on the relay while control for causing the alarm circuit to output the alarm signal is being executed.

Electrical storage system

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.

System for determining fixation of relay

An electrical storage system includes a relay switching between an on state where an electrical storage device () is connected to a load and an off state where connection of the electrical storage device with the load is interrupted; a controller controlling an on-off state of the relay; and a current interruption circuit () interrupting energization of the electrical storage device. The current interruption circuit includes an alarm circuit () outputting an alarm signal indicating that any one electrical storage block is in an overcharged state by comparing a voltage value of each electrical storage block with a threshold; a latch circuit () retaining the alarm signal; a transistor () causing the relay to switch from the on state to the off state upon reception of an output signal of the latch circuit; and a power supply circuit () generating electric power for operating the latch circuit using electric power of the electrical storage device.

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.

Electrical storage system for vehicle

An electrical storage system includes: an electrical storage device () including serially connected electrical storage blocks; a relay (SMR-B, SMR-G) switching a connection state between the electrical storage device and a load; a controller () controlling the relay; and a current interruption circuit () interrupting energization of the electrical storage device. The current interruption circuit () includes an alarm circuit () outputting an alarm signal indicating that any one electrical storage block is overcharged or overdischarged by comparing a voltage value of each electrical storage block with a threshold; a latch circuit () retaining the alarm signal; and a transistor () causing the relay to switch from an on state to an off state upon reception of a latch circuit output signal. The controller determines an energization state of the electrical storage device after executing control for causing the alarm circuit to output the alarm signal by changing the voltage value or the threshold.

A first electrical storage stack is connected in series with a second electrical storage stack. A current interrupter is configured to interrupt a current path by being removed from the current path. First and second detection line are respectively connected to first and second terminals of the first electrical storage stack. The second electrical storage stack is connected to the second terminal of the first electrical storage stack via the current interrupter. A third detection line is connected to a portion of the current path, located on the second electrical storage stack side of the current interrupter. A controller is configured to control charging and discharging operations of each of the first and second electrical storage stacks on the basis of the voltage of the first electrical storage stack, the voltage being detected via the first detection line and the third detection line.

Electrical storage system, and control method for electrical storage system

A plurality of detection units are connected respectively in parallel with a plurality of battery cells connected in series. The detection units each include an inductor and a zener diode connected in series. A battery checker includes a plurality of detection inductors and a single voltmeter that form a closed circuit. A plurality of detection inductors are arranged so that they are magnetically coupled respectively with the inductors of the plurality of detection units. Each zener diode is connected with the polarity to be reverse biased by the output voltage of the battery cell. Respective breakdown voltages of the zener diodes are set higher than the output voltage of each battery cell in normal use and different in a stepwise manner from each other.

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Nagoya, Japan

Yukinari Tanabe