Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Ryo Mano

Teruo Ishishita

Yoshiaki Kikuchi

Tomomichi Mizoguchi

Takumi Shimizu

Hiroyuki Obata

Keisuke Tanigawa

Manabu Sasaki

Jyunta Izumi

Koichiro Muta

Junichi Matsumoto

Hiroki Endo

Hideki Kamatani

Takashi Ogura

Takao Itoh

Takayoshi Tezuka

Masahiro Kagami

Yusuke Ito

Makoto Yamasaki

When a voltage value of an electrical storage device becomes higher than a predetermined voltage value for identifying an overcharged state of the electrical storage device, calculation of a heat generation amount of the electrical storage device based on a current value is started. When the calculated heat generation amount is larger than a predetermined amount, it is determined that the electrical storage device is in an abnormal state (abnormal state related to heating). Because the electrical storage device enters an easily heated state when the voltage value becomes higher than the predetermined voltage value, the heat generation amount may be monitored by starting calculation of the heat generation amount. Once the voltage value becomes higher than the predetermined voltage value, irrespective of a high/low relationship between the voltage value and the predetermined voltage value, the abnormal state may be determined by monitoring the heat generation amount.

Electrical storage system

A power supply system includes a controller. The controller is configured to; a) control charging and discharging of an electrical storage device upon reception of an output of a current sensor and a voltage sensor, b) calculate a control current value by subtracting an offset value from a detected value of the current sensor, c) calculate a first determination result and a second determination result, respectively obtained by determining whether the electrical storage device is being charged or discharged based on the control current value, and based on a change in a remaining amount of charge of the electrical storage device, and d) when the first determination result and the second determination result differ from each other, change the offset value such that the first determination result coincides with the second determination result.

Power supply system for vehicle

A control system for a battery includes a current sensor and an electronic control unit. The electronic control unit is configured to calculate a first error and a second offset error of the current sensor respectively based on outputs of the current sensor just before a stop of the electronic control unit and at startup of the electronic control unit. The electronic control unit is configured to correct an output of the current sensor by using a first error when a temperature of the current sensor at startup of the electronic control unit is higher than or equal to a threshold temperature, and correct the output of the current sensor by using a second error when the temperature of the current sensor at startup of the electronic control unit is lower than the threshold temperature.

Control system for battery

When a catalyst temperature is lower than a predetermined temperature on a second or subsequent start of an engine since system activation of a vehicle, a catalyst warm-up request is output for the purpose of warming up a catalyst in a catalytic converter. An output limit Wout of a battery is not increased in response to a second or subsequent output of the catalyst warm-up request, while being increased in response to a first output of the catalyst warm-up request. Accordingly, the catalyst warm-up in response to the second or subsequent output of the catalyst warm-up request since the system activation suppresses excessive output of electric power from the battery and thereby suppresses deterioration of the battery. Catalyst warm-up is performed in response to the second or subsequent output of the catalyst warm-up request. This suppresses deterioration of emission. As a result, this configuration satisfies both (balances) suppression of deterioration of the battery and suppression of deterioration of emission.

Hybrid vehicle

A plurality of voltage switching circuitsare provided in a switching unitto relatively change a reference voltage to plural levels, thus detecting a spontaneous change of the reference voltage. A range of relative change in the reference voltage by the plurality of voltage switching circuitsis set to a usage voltage rangeoras a part of a total voltage rangeof each of cellsto. This eliminates the need to provide voltage switching circuitsrequired to relatively change the reference voltage over the total voltage range of each of the cellsto, making it possible to minimize the number of the voltage switching circuitsfor each of the cellsto. Thus, it is possible to prevent the size of a battery pack control apparatusfrom increasing.

Battery pack control apparatus

A first monitor circuitand a second monitor circuiteach having an identical configuration are provided in a voltage monitor. A threshold switching sectionswitches a threshold of each of switching unitsandprovided in the respective monitor circuitsandto a same value. Each of comparatorsandcompares the threshold with a reference voltage to output a result of the comparison. A fault detecting sectioncompares the respective outputs from the comparatorsandwith each other to detect a characteristic shift of the threshold of each of the monitor circuitsand

Voltage monitor for monitoring voltage of a battery

A battery system includes a discharge amount obtaining portion that obtains a discharge amount (determination zone discharge amount) from a determination start voltage until a predetermined determination end voltage of a battery; an internal resistance obtaining portion that obtains an internal resistance value of the battery; a correlation map in which a combination of internal resistance value information and determination zone discharge amount information for a battery that is the same kind as a target of a determination and in which lithium deposition has not occurred is stored for each degree of age-related deterioration of the battery; and a deposition determining portion that determines a degree of lithium deposition in the target battery by comparing the determination zone discharge amount during the determination of the target battery with the internal resistance value during the determination of the target battery on the same scale by converting at least one via the correlation map.

Nonaqueous electrolyte solution type lithium ion secondary battery system, method for determining lithium deposition in that system, and vehicle provided with that system

A determination system for determining whether metal lithium is precipitated in a lithium ion secondary battery includes: a discharging unit that causes the lithium ion secondary battery to perform constant current discharge until a voltage of the lithium ion secondary battery becomes a voltage corresponding to a predetermined low state of charge; a natural increase acquisition unit that acquires a natural increase in voltage of the lithium ion secondary battery after the constant current discharge is terminated; and a precipitation determining unit the compares the acquired natural increase with a predetermined threshold, that determines that the metal lithium is not precipitated when the natural increase is larger than or equal to the threshold, and that determines that the metal lithium is precipitated when the natural increase is smaller than the threshold.

Determination system and determination method for determining whether metal lithium is precipitated in a lithium ion secondary battery, and vehicle equipped with the determination system

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Toyota, Japan

Ryo Mano