Abstract: An input/output control device for a secondary battery mounted on a vehicle includes a current estimating unit estimating a battery current input to or output from the secondary battery based on an input/output power of the secondary battery and outputting an estimated value (estimated current (Is)), a current sensor measuring the battery current and outputting a measured value (measured current (It)), and an input/output control unit controlling the input/output power based on the estimated value and the measured value. The input/output control device controls the input/output of the secondary battery, using the measured current (It) as well as the estimated value (Is), and therefore can suppress more reliably significant increase in heating value of the secondary battery and its peripheral parts.

Abstract: A battery pack has a plurality of assembled batteries connected in parallel. Each of the assembled batteries has a plurality of cells connected electrically. A circulating current in each of the assembled batteries is calculated from an open circuit voltage of the assembled battery that varies according to the number of the cells connected in series, a value indicating a charge state of the assembled battery that varies according to the number of the cells connected in parallel, and an internal resistance of the assembled battery. The number of the cells connected in parallel and the number of the cells connected in series in each of the assembled batteries are numbers determined under the condition that the circulating current should not exceed an allowable current value for the assembled battery.

Abstract: Each detection unit is configured to compare a voltage output from a battery cell associated therewith a predetermined criterion voltage. A plurality of detection units operate sequentially in response to a start trigger and also sequentially transmit a signal that reflects a result of comparing the voltages to detect whether a battery pack has a low cell voltage fault. A fault monitoring device detects an internal resistance fault when it receives from a transmission circuit a determination signal indicating that the battery pack when electrically discharged has any of its battery cells outputting a voltage decreased to be lower than the criterion voltage and if a current detected has a value smaller in magnitude than a criterion current corresponding to a value of a current obtained by dividing a difference in voltage between an open circuit voltage of the battery cell and the criterion voltage by an upper limit value for internal resistance.

Abstract: An abnormality detecting system sequentially compares the output voltages of n-piece battery cells that are connected in series, with a criteria voltage, at respective points in time Tv1-Tvn, and produces a determination signal indicative of the presence or absence of any battery cell whose voltage becomes lower than the criteria voltage at time Tvc. The battery current Ib is sampled a predetermined number of times at intervals of a predetermined sampling cycle period ?Ti. The current sampling times Ti1-Ti3 are provided within a period that lies inside a voltage sampling period Ta-Tb including the above-indicated times Tv1-Tvn, with a given period of time (?Ti?2) or less provided at each side of the period.

Abstract: 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.

Abstract: A plurality of voltage switching circuits 41 are provided in a switching unit 40 to 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 circuits 41 is set to a usage voltage range 81 or 82 as a part of a total voltage range 80 of each of cells 1a to 1d. This eliminates the need to provide voltage switching circuits 41 required to relatively change the reference voltage over the total voltage range of each of the cells 1a to 1d, making it possible to minimize the number of the voltage switching circuits 41 for each of the cells 1a to 1d. Thus, it is possible to prevent the size of a battery pack control apparatus 2 from increasing.

Abstract: During use of a secondary battery, a concentration change ratio estimating unit estimates a ratio of change in electrolytic solution concentration based on a charging/discharging current. According to the estimated ratio of change, a concentration estimated value calculating unit sequentially calculates an electrolytic solution concentration estimated value during the use of the secondary battery. Based on the estimated electrolytic solution concentration estimated value, a determining unit determines whether or not the electrolytic solution concentration is within a normal range. When the electrolytic solution concentration is outside the normal range, a charging/discharging condition modifying unit modifies a charging/discharging condition of the secondary battery to bring the electrolytic solution concentration back to the normal range, thus avoiding a tendency of overcharge or a tendency of overdischarge.

Abstract: A control device for a secondary battery includes an offset addition unit calculating an offset amount based on a plurality of voltage values sensed by a sensor, the number of a plurality of battery cells included in one battery block and a preset range, and adding an offset amount to the sensed voltage values, when a flag is turned on to indicate the fact the voltage value of one of the battery cells falls within a preset range, and also includes an I/O control unit controlling charge/discharge of the battery based on voltage values containing the offset amount added thereto. Even when the battery voltage is sensed a battery block at a time, the voltage value can be controlled a cell at a time.

Abstract: A first monitor circuit 50 and a second monitor circuit 60 each having an identical configuration are provided in a voltage monitor. A threshold switching section 41 switches a threshold of each of switching units 51 and 61 provided in the respective monitor circuits 50 and 60 to a same value. Each of comparators 53 and 63 compares the threshold with a reference voltage to output a result of the comparison. A fault detecting section 42 compares the respective outputs from the comparators 53 and 63 with each other to detect a characteristic shift of the threshold of each of the monitor circuits 50 and 60.

Abstract: A charge/discharge power upper limit value is set by referencing different maps for a catalyst warm-up period and other period so as to limit charge/discharge of a main battery in accordance with increase of the battery temperature. As a result, during the catalyst warm-up period, a limit start temperature at which a limit of the charge/discharge power is started and a charge/discharge inhibit temperature at which the charge/discharge is inhibited are set in accordance with the characteristic of the main battery. During a period other than the catalyst warm-up period, the limit start temperature and the charge/discharge inhibit temperature are set lower than during the catalyst warm-up period.

Abstract: At time t1 an ignition-off command (IGOFF(1)) is received. In response, a CPU refers to an estimated battery temperature map to obtain an estimated battery temperature (#Tb(1)) corresponding to an outside air temperature (Tout) obtained at time t1. At time t2, an ignition-on command (IGON(1)) is received. In response, the CPU obtains an actual battery temperature (Tb(1)) obtained at time t2 and from the estimated battery temperature (#Tb(1)) and the actual battery temperature (Tb(1)) calculates a modified, estimated battery temperature (#Tb_NEW(1)) for the first received ignition-on command (IGON(1)). Furthermore the CPU updates a value corresponding to the outside air temperature (Tout) obtained at time t1 in the estimated battery temperature map to be the corrected, estimated battery temperature (#Tb_NEW(1)).

Abstract: An SOC calculating unit calculates a first value based on an open voltage of a battery upon startup of a vehicle (when the operation of the battery starts), and has a calculated second value stored in a storage unit upon stop of the vehicle (when the operation of the battery ends). An initial value selecting unit selects the first value as an initial value when a predetermined condition is satisfied, and selects the second value as the initial value when this condition is not satisfied. In a case where the first value has low reliability, the second value is set as the initial value even if the second value may be deviated from an actual SOC value. This can reduce a difference between the SOC value stored in advance and the actual SOC value as compared with that in a case where the first value is set as the initial value.

Abstract: A battery charge/discharge control device (20) includes an input-enabled power adjustment unit (40) having an input-enabled current value calculation unit (42) and an input power limit value calculation unit (44). The input-enabled current value calculation unit (42) uses a battery current value, a battery temperature value, and an estimated charge capacity value at the time “t” upon execution of detection, so as to obtain an input-enabled current value reduction amount per unit time during charge and an enabled current amount recovery amount per unit time when being left uncontrolled.

Abstract: An electric vehicle is provided with a cell voltage sensor (32) and a cell temperature sensor (31) which are mounted to each of a plurality of cells (21); a gas temperature sensor (33), a carbon monoxide gas sensor (34), and a hydrogen gas sensor (35) which are mounted to a chamber (27); a gas temperature sensor (36), a carbon monoxide gas sensor (37), and a hydrogen gas sensor (38) which are mounted to a gas exhaust passage (28); and an air-conditioning fan (17), a channel-switching damper (19), and a driving motor (42) which lowers a window glass (41). When battery state values detected by the sensors (31) to (38) exceed predetermined thresholds, a battery pack (20) is judged to be abnormal. Then, the channel-switching damper (19) and the air-conditioning fan (17) are started and the window glass (41) is lowered to ventilate the vehicle interior. This speedily exhausts smoke generated from a lithium ion battery.

Abstract: An ECU calculates an evaluation value decrease amount D(?) in response to a reduction of unevenness of lithium ion concentration caused by diffusion of lithium ions resulting from a lapse of one cycle time ?T, calculates an evaluation value increase amount D(+) in response to an increase of the unevenness of the lithium ion concentration caused by discharging during a lapse of one cycle time ?T, and calculates a present value D(N) of a battery deterioration evaluation value D due to high-rate discharging, as a previous value D(N?1)?evaluation value decrease amount D(?)+evaluation value increase amount D(+). If battery deterioration evaluation value D exceeds a predetermined target value E, the ECU sets a discharging power limit value WOUT that is a limit value of electric power to be discharged from a battery, to a value lower than a maximum value W(MAX).

Abstract: During use of a secondary battery, a concentration change ratio estimating unit estimates a ratio of change in electrolytic solution concentration based on a charging/discharging current. According to the estimated ratio of change, a concentration estimated value calculating unit sequentially calculates an electrolytic solution concentration estimated value during the use of the secondary battery. Based on the estimated electrolytic solution concentration estimated value, a determining unit determines whether or not the electrolytic solution concentration is within a normal range. When the electrolytic solution concentration is outside the normal range, a charging/discharging condition modifying unit modifies a charging/discharging condition of the secondary battery to bring the electrolytic solution concentration back to the normal range, thus avoiding a tendency of overcharge or a tendency of overdischarge.

Abstract: A battery monitoring unit and sensors are supplied with a common operating supply voltage to operate. Detection values from sensors are sent to a control circuit by the battery monitoring unit. The control circuit monitors the operating supply voltage using a voltage sensor and additionally determines whether or not the detection values from the sensors before the relay connection falls within a normal range to more accurately detect a power supply reduction abnormality of the battery monitoring unit. Therefore, abnormalities can be detected accurately when the sensor and the battery monitoring unit provided for the secondary battery cannot operate normally due to a reduced operating supply voltage.

Abstract: An input/output control device for a secondary battery mounted on a vehicle includes a current estimating unit estimating a battery current input to or output from the secondary battery based on an input/output power of the secondary battery and outputting an estimated value (estimated current (Is)), a current sensor measuring the battery current and outputting a measured value (measured current (It)), and an input/output control unit controlling the input/output power based on the estimated value and the measured value. The input/output control device controls the input/output of the secondary battery, using the measured current (It) as well as the estimated value (Is), and therefore can suppress more reliably significant increase in heating value of the secondary battery and its peripheral parts.

Abstract: An SOC calculating unit calculates a first value based on an open voltage of a battery upon startup of a vehicle (when the operation of the battery starts), and has a calculated second value stored in a storage unit upon stop of the vehicle (when the operation of the battery ends). An initial value selecting unit selects the first value as an initial value when a predetermined condition is satisfied, and selects the second value as the initial value when this condition is not satisfied. In a case where the first value has low reliability, the second value is set as the initial value even if the second value may be deviated from an actual SOC value. This can reduce a difference between the SOC value stored in advance and the actual SOC value as compared with that in a case where the first value is set as the initial value.

Abstract: A control device for a secondary battery includes an offset addition unit (62) calculating an offset amount based on a plurality of voltage values (V0-Vn) sensed by a sensor, the number of a plurality of battery cells included in one battery block and a preset range, and adding an offset amount to the sensed voltage values (V0-Vn), when a flag (FLG) is turned on to indicate the fact the voltage value of one of the battery cells falls within a preset range, and also includes an I/O control unit (64) controlling charge/discharge of the battery based on voltage values (V0A-VnA) containing the offset amount added thereto. Even when the battery voltage is sensed a battery block at a time, the voltage value can be controlled a cell at a time.