JP2010057292A - Power supply for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more accurately detect the temperatures of a plurality of batteries, by detecting without fail the in-range failures in a plurality of temperature sensors which detect the temperatures of the plurality of batteries. <P>SOLUTION: The power supply for a vehicle includes a travel battery 1, in which a plurality of secondary batteries 2 are connected for supplying power to a motor that travels a vehicle; a plurality of temperature sensors 3 for detecting the temperatures of the secondary batteries 2 of the travel battery 1; a control circuit 4 which controls charging/discharging of the travel battery 1, at the battery temperature detected by the temperature sensor 3; and a failure determining circuit 5 which detects failure of the temperature sensors 3, based on the detected temperatures of the plurality of temperature sensors 3. The failure-determining circuit 5 includes a calculation circuit 6 so as to detect the stoppage of the vehicle and go into operating state, after the set period elapses which is set longer than the converging time of abnormal heating of the battery. In the failure-determining circuit 5, the calculation circuit 6 in operation calculates the detection temperatures detected by the temperature sensors 3, to determine failure with respective temperature sensors 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply device mounted on an electric vehicle such as a hybrid car or an electric vehicle, and more particularly to a vehicle power supply device including a temperature sensor that detects the temperature of a running battery that supplies power to a motor that runs the vehicle. .

  The power supply device for vehicles detects the battery temperature of the battery for driving | running | working which supplies electric power to the motor which drive | works a vehicle with a temperature sensor. This is because the secondary battery has physical properties in which electrical characteristics change depending on the temperature, and when the battery temperature becomes abnormally high or low, the charge / discharge current is limited to a small amount. Moreover, since the battery for driving | running | working of a hybrid car is used repeating charging and discharging, the remaining capacity which changes with charging / discharging is calculated. By controlling charging / discharging so that the remaining capacity falls within the set range, the battery life is reduced and the life is extended. Since the battery is remarkably deteriorated by overcharge and overdischarge, the charge / discharge is controlled so that the remaining capacity is in a predetermined range centering on 50%. The remaining battery capacity is calculated by adding the charge capacity and subtracting the discharge capacity. The charge capacity is calculated by the product of the charge current and time, that is, the integrated value of the charge current, and the discharge capacity is calculated by the integrated value of the discharge current. The charge capacity and the discharge capacity that are substantially charged in the battery can be calculated more accurately by correcting the integrated value with the temperature. Since the remaining capacity of the battery is calculated by repeating charging and discharging, and repeating addition and subtraction, errors accumulate as time passes. The accumulated error causes the calculated remaining capacity to be distorted so that charging and discharging cannot be performed within the set remaining capacity range. In order to prevent this harmful effect, it is required to accurately detect the temperature of the battery. Furthermore, in order to supply a large electric power to the motor, the traveling battery increases the output voltage by connecting a large number of secondary batteries in series. It is extremely difficult to make all the battery temperatures uniform in a traveling battery composed of a large number of batteries, and there is a temperature difference between the batteries. The battery temperature difference causes an error in the calculation of the remaining capacity. In order to more accurately detect the remaining capacity of each battery, a plurality of temperature sensors are provided to accurately detect each battery temperature.

  However, a power supply device including a large number of temperature sensors also increases the probability that the temperature sensor will fail. A disconnection or short circuit failure of the temperature sensor can be easily determined because the detected temperature is greatly deviated. However, it is extremely difficult to determine the failure of a failure in which the temperature detected by the temperature sensor deviates within a range where the battery temperature changes, that is, an in-range failure. This is because each battery has a temperature difference, so that it is impossible to distinguish between a temperature sensor failure and a battery temperature difference.

By the way, in order to detect the failure of the water temperature sensor that detects the water temperature of the engine, a failure determination device has been developed that determines a failure from the temperature detected by the water temperature sensor after a predetermined time has elapsed since the vehicle was stopped. (See Patent Document 1)
JP 2008-25468 A

  The apparatus described in Patent Document 1 detects a temperature difference between a detected temperature of the water temperature sensor when the engine is stopped and a detected temperature of the water temperature sensor after a certain time has elapsed after the engine is stopped. Determine failure. That is, if the temperature difference exceeds the set value corrected by the intake air temperature, it is determined that the water temperature sensor has failed. Although this structure can determine the failure of the water temperature sensor, it has a drawback that it cannot accurately detect a failure due to a slight deviation, for example, a battery in-range failure. In particular, when the engine is stopped, the water temperature gradually decreases, so that the water temperature can be brought close to the intake air temperature after a certain period of time. However, depending on the state of charge and discharge before the vehicle is stopped, the battery temperature of the vehicle battery may temporarily rise due to abnormal heat generation after the vehicle stops. The temperature rise of the battery changes depending on the charge / discharge conditions before the vehicle is stopped. Therefore, the battery temperature rises at some times and does not rise at other times. Therefore, if a failure is determined from the temperature detected by the temperature sensor after a certain time has elapsed, the failure cannot be determined accurately due to an error due to abnormal heat generation of the battery. In order to avoid the influence of this abnormal heat generation, if the condition range for determining a failure is widened, a slight deviation of the temperature sensor cannot be determined as a failure. In a temperature sensor that detects the temperature of a traveling battery composed of a large number of batteries, a slight difference in detected temperature affects the calculation of the remaining capacity, causing deterioration of the battery. For this reason, the power supply device for vehicles does not detect the temperature with a single sensor like a water temperature sensor, but accurately detects each battery temperature having a slight temperature difference with a plurality of temperature sensors. The change in the battery characteristics due to temperature is accurately detected, and the remaining capacity and the like are accurately calculated. For this reason, it is important for a vehicle power supply device to accurately determine a failure due to a slight deviation of a plurality of temperature sensors, but this failure cannot be detected by failure determination of the water temperature sensor.

  The present invention has been developed for the purpose of satisfying the above requirements. An important object of the present invention is to provide a power supply device for a vehicle that can reliably detect the in-range failure of a plurality of temperature sensors that detect the temperature of a plurality of batteries and more accurately detect the temperature of the plurality of batteries. There is.

Means for Solving the Problems and Effects of the Invention

  The power supply device for a vehicle according to the present invention includes a traveling battery 1 that connects a plurality of secondary batteries 2 that supplies power to a motor that travels the vehicle, and the temperature of the secondary battery 2 of the traveling battery 1. A plurality of temperature sensors 3 to be detected, a control circuit 4 that controls charging / discharging of the traveling battery 1 at a battery temperature detected by the temperature sensors 3, and each temperature sensor 3 from the detected temperatures of the plurality of temperature sensors 3. And a failure determination circuit 5 for detecting a failure. The failure determination circuit 5 includes an arithmetic circuit 6 that is in an operating state when a set time that is longer than the time when the abnormal heat generation of the battery is converged is detected by detecting the stop of the vehicle. The failure determination circuit 5 determines the failure of each temperature sensor 3 by calculating each detected temperature detected by each temperature sensor 3 by the arithmetic circuit 6 in the operating state.

  The above-described power supply device for a vehicle has a feature that the in-range failure of the plurality of temperature sensors that detect the temperature of the plurality of batteries can be reliably detected, and the temperature of the plurality of batteries can be detected more accurately. In particular, the above power supply device has an arithmetic circuit that enters an operating state after a set time set longer than the time when the abnormal heat generation of the battery converges, and detects each detected temperature detected by each temperature sensor. By calculating and determining the failure of each temperature sensor, the in-range failure of each temperature sensor can be accurately determined.

In the vehicle power supply device of the present invention, the arithmetic circuit 6 of the failure determination circuit 5 has a maximum error for determining a failure from the average value of the detected temperatures detected by each temperature sensor 3 and the detected temperature of each temperature sensor 3. By storing the temperature, the battery temperature sensor 3 in which the difference between the detected temperature and the average value is larger than the maximum error temperature can be determined as a failure.
The above power supply apparatus can accurately determine an in-range failure of each temperature sensor with a simple calculation of an arithmetic circuit. This is because an in-range failure is determined from the average value of the detected temperatures detected by each temperature sensor.

Furthermore, in the power supply device for a vehicle according to the present invention, the arithmetic circuit 6 stores the temperature change characteristic of each temperature sensor 3 that changes when the vehicle is stopped, and determines a failure from the temperature change characteristic and the temperature difference. be able to.
Since the above power supply apparatus determines the failure while correcting the detected temperature detected by each temperature sensor with the temperature change characteristic, the in-range failure can be determined more accurately.

The power supply device for a vehicle according to the present invention includes a cooling mechanism 7 that cools the traveling battery 1, and a cooling medium temperature sensor 8 that detects the temperature of the medium that the cooling mechanism 7 forcibly cools the secondary battery 2. In addition, the arithmetic circuit 6 can calculate each detected temperature that is detected by each temperature sensor 3 in the operating state, and can determine a failure of each temperature sensor 3.
In addition to the temperature sensor that detects the temperature of the battery, the above power supply apparatus can also accurately determine the failure of the temperature sensor that detects the temperature of a medium that cools the battery, such as cooling air.

In the power supply device for a vehicle of the present invention, the control circuit 4 corrects and calculates the remaining capacity of the secondary battery 2 to be charged / discharged with the detected temperature of the temperature sensor 3 that detects the temperature of the secondary battery 2. be able to.
The above power supply device can charge and discharge while detecting the remaining capacity of the battery more accurately by correcting the remaining capacity with the temperature detected by the temperature sensor. For this reason, there is a feature that the battery life can be extended by reducing the deterioration of the battery.

Furthermore, in the power supply device for a vehicle according to the present invention, the control circuit 4 is disposed adjacent to the temperature sensor 3 determined by the control circuit 4 to determine the detected temperature of the temperature sensor 3 determined to be a failure. The remaining capacity of the secondary battery 2 can be calculated using the calculated detected temperature.
The power supply apparatus described above can accurately detect the remaining capacity of the battery whose temperature is detected by the failed temperature sensor even if any of the temperature sensors fails. This is because the temperature of the battery detected by the temperature sensor that has failed at the battery temperature detected by the nearby temperature sensor is detected by interpolation.

The power supply device for a vehicle of the present invention can put the arithmetic circuit 6 into an operating state after 4 hours or more have elapsed after detecting the stop of the vehicle.
The above power supply devices focus on abnormal battery heat generation after the vehicle stops, and then determine the failure from the detected temperature of each temperature sensor, thereby accurately detecting in-range failures of each temperature sensor. it can.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a vehicle power supply device for embodying the technical idea of the present invention, and the present invention does not specify the vehicle power supply device as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The power supply device for a vehicle shown in FIG. 1 supplies a power to a motor that travels the vehicle and is connected to a plurality of secondary batteries 2 and a temperature of the secondary battery 2 of the traveling battery 1. , A control circuit 4 for controlling charging / discharging of the traveling battery 1 at the battery temperature detected by the temperature sensor 3, and each temperature sensor 3 based on the temperature detected by the plurality of temperature sensors 3. And a failure determination circuit 5 for detecting the failure.

  The traveling battery 1 has a plurality of secondary batteries 2 connected in series to increase the output voltage. The traveling battery 1 adjusts the output voltage by the number of secondary batteries 2 connected in series. The number of secondary batteries 2 connected in series is a number that sets the output voltage of the traveling battery 1 to 100V to 300V. As the secondary battery 2, any rechargeable battery such as a nickel metal hydride battery or a lithium ion battery can be used.

  The traveling battery 1 is charged and discharged with a large current and generates heat. In order to detect the temperature of each secondary battery 2, a plurality of temperature sensors 3 are provided. The power supply device of FIG. 1 is provided with eight temperature sensors 3. Each temperature sensor 3 is fixed so as to be thermally coupled to the surface of the secondary battery 2, and detects the temperature of the secondary battery 2. The traveling battery 1 has a large number of secondary batteries 2 connected in series in order to increase the output voltage. For example, a traveling battery in which nickel hydride batteries are connected in series and have an output voltage of 288 V has 240 nickel hydride batteries connected in series. The traveling battery 1 in which the secondary battery 2 is a nickel metal hydride battery has 5 to 6 nickel metal hydride batteries connected in series to form a battery module, and the battery modules are connected in series to set the output voltage to a predetermined voltage. Yes. For example, a battery module in which five secondary batteries are connected in series can be connected to 48 in series to achieve an output voltage of 288V. Moreover, the battery module which connected six secondary batteries in series can connect 40 pieces in series, and can be set to 288V.

  The traveling battery 1 does not always detect the temperature of the secondary battery 2 with the temperature sensor 3. For example, a running battery consisting of 240 secondary batteries detects the temperature of a secondary battery at a representative position with eight temperature sensors, and detects the temperature of other secondary batteries from these detected temperatures. Identify the temperature. In this power supply device, battery modules are arranged in two rows, temperature sensors are arranged on both sides and two middle points of each row, and each row is composed of four temperature sensors, for a total of eight temperature sensors. Thus, the temperature of the secondary battery is detected. The plurality of temperature sensors 3 are arranged so as to detect a battery having the highest temperature, a battery having the lowest temperature, a battery whose temperature is likely to change, and the like. A traveling battery in which 24 battery modules are arranged in one row detects the temperature of two battery modules at both ends and an intermediate part with four temperature sensors, and calculates the temperature of all battery modules. A battery module whose temperature is not directly detected is calculated by interpolating the detection temperature of a temperature sensor that detects the temperature of a battery module in the vicinity of the battery module in consideration of the distance.

  FIG. 2 shows a state in which the control circuit 4 calculates the temperatures of all the battery modules by interpolation. This figure shows a state in which 24 battery modules are detected by four temperature sensors, and the temperatures of battery modules that do not detect the temperature are interpolated and detected. A solid line A in this figure shows a state in which the temperature of the battery modules arranged between the temperature sensors is calculated by interpolating the detected temperature detected by the temperature sensor with a straight line. The chain line B calculates the temperature of the battery module whose temperature is not directly detected by interpolating the detected temperature with a curve.

  Like a nickel-metal hydride battery battery, a battery that uses a secondary battery as a lithium-ion battery detects the temperature of a representative battery from a number of lithium-ion batteries and calculates all battery temperatures. To detect.

  The traveling battery 1 generates heat because it is charged and discharged with a large current. In order to lower the temperature of the battery below the set value, the power supply device of FIG. 1 includes a battery cooling mechanism 7. The cooling mechanism 7 shown in the figure includes a blower fan 10 that forcibly blows air over the surface of the battery to cool the battery. The battery 1 for driving | running | working provides the ventilation gap 11 between the secondary batteries 2 which allows air to pass through. Further, an inflow duct 12 and an exhaust duct 13 are provided so as to face the outside of the traveling battery 1 so as to forcibly blow air to each secondary battery 2. The blower fan 10 supplies air to the inflow duct 12 or sucks air from the discharge duct 13 to forcibly blow air into the blower gap 11 of the secondary battery 2. The cooling mechanism 7 includes a temperature sensor 8 that detects an intake temperature and an exhaust temperature. The control circuit 4 controls the operation of the blower fan 10 by determining the heat generation state and the cooling state of the battery from the intake temperature and exhaust temperature detected by the temperature sensor 8 and the battery temperature detected by the temperature sensor 3.

  A power supply device including a large number of temperature sensors 3 detects an in-range failure of the temperature sensor 3 with a failure determination circuit 5. The failure determination circuit 5 includes an arithmetic circuit 6 that is in an operating state when a set time that is longer than the time when the abnormal heat generation of the battery is converged is detected by detecting the stop of the vehicle. The arithmetic circuit 6 has a built-in timer that stores the activation time. The timer starts counting at the timing when the ignition switch, which is the main switch of the vehicle, is turned off, and when the preset time stored in advance elapses, the timer expires and outputs an activation signal. With this activation signal, the arithmetic circuit 6 enters an operating state. The set time stored by the timer is set longer than the time when the abnormal heat generation of the battery converges.

  FIG. 3 shows the battery temperature at which the temperature rises due to abnormal heat generation when the vehicle is stopped. As shown in this figure, the traveling battery 1 may temporarily rise without being lowered after being stopped due to charging / discharging before the vehicle is stopped. Since the abnormal heat generation of the battery does not occur in the same manner in all the batteries, if the failure is determined from the temperature detected by the temperature sensor 3 at the timing affected by the abnormal heat generation, the in-range failure cannot be detected accurately. Therefore, the set time of the timer is set to a time longer than the temperature of the battery that has risen due to the abnormal heat generation and is increased, for example, 4 hours or more, preferably 5 hours or more. If the set time of the timer is too long, the frequency of detecting an in-range failure of the temperature sensor 3 is reduced. Therefore, the set time of the timer is set to 10 hours or less, preferably 8 hours or less, for example.

The arithmetic circuit 6 enters an operating state, calculates the detected temperature of each temperature sensor 3, and determines a failure. The arithmetic circuit 6 determines the failure of each temperature sensor 3 by performing the following calculation.
(1) The average value of the detected temperatures detected by each temperature sensor 3 is calculated.
(2) The temperature difference between the calculated average value of the detected temperatures and the detected temperature of each temperature sensor 3 is calculated, the calculated temperature difference is compared with the maximum error temperature, and the temperature difference is greater than the maximum error temperature. If it is larger, it is judged as a failure. The maximum error temperature is set to, for example, 1 ° C to 5 ° C, preferably 2 ° C to 4 ° C. By reducing the maximum error temperature, an in-range failure of the temperature sensor 3 can be detected more accurately. However, if the maximum error temperature is too small, there is a detrimental effect that a non-failed temperature sensor 3 is determined as a failure when the detected temperature of the temperature sensor 3 fluctuates under an external condition, not an in-range failure. Therefore, the maximum error temperature is set in the above-described range so that a determination error due to an external condition does not occur while reliably detecting an in-range failure.

  The power supply device for a vehicle stops the vehicle, and when a set time set for a longer time than the abnormal heat generation of the battery converges, for example, 4 hours to 6 hours, the battery temperature and other cooling mechanisms The temperature of the cooling medium 7 becomes a temperature close to the outside air temperature. Accordingly, the detected temperatures detected by the respective temperature sensors 3 are substantially equal. Therefore, in this state, the temperature sensor 3 whose detected temperature is different from the detected temperature of the other temperature sensors 3 can be determined as an in-range failure.

  Further, the arithmetic circuit 6 stores the temperature change characteristic of each temperature sensor 3 that changes after the vehicle is stopped, and determines the failure from the stored temperature change characteristic and the temperature difference, thereby making the in-range more accurate. A failure can be determined. For example, when there is a detected temperature difference between the temperatures detected by the respective accurate temperature sensors 3 when the set time has elapsed, the detected temperature difference is stored in the arithmetic circuit 6 in advance, and is corrected by the detected temperature difference. Then, by comparing the detected temperature of each temperature sensor 3 with the average value, an in-range failure of the temperature sensor 3 can be determined more accurately.

  Furthermore, the arithmetic circuit 6 stores the correct detected temperature of each temperature sensor 3 after the set time has passed in the memory as a standard temperature range in the memory regardless of the temperature difference from the average value of each temperature sensor 3. If the detected temperature is not within the standard temperature range as compared to the detected temperature detected after the set time has elapsed, it can be determined that an in-range failure has occurred. The arithmetic circuit 6 can determine the in-range failure of each temperature sensor 3 more accurately by correcting the standard temperature range with the outside air temperature. The outside air temperature can be detected by the temperature sensor 8, for example.

  The arithmetic circuit 6 is in a state where the vehicle is running or in a state where the vehicle is stopped and the arithmetic circuit 6 is in an operating state, so that the temperature detected by each temperature sensor 3 deviates from the preset maximum temperature range. When the value is reached, it can be determined that there is a failure.

  The control circuit 4 corrects and calculates the remaining capacity of the secondary battery 2 to be charged / discharged with the detected temperature of the temperature sensor 3 that detects the temperature of the secondary battery 2. The remaining capacity of the secondary battery 2 is calculated by adding the integrated value of the charge capacity and subtracting the integrated value of the discharge capacity. At this time, the remaining capacity calculation circuit calculates the remaining capacity by correcting the integrated value with the temperature.

  The control circuit 4 that calculates the remaining capacity of the secondary battery 2 controls charging / discharging of the traveling battery 1 so that the remaining capacity falls within the set range. The control circuit 4 controls charging / discharging with the temperature of each secondary battery 2. When the temperature of the secondary battery 2 is higher than the maximum temperature or lower than the minimum temperature, the charging / discharging current is interrupted or limited to a small value to charge / discharge while protecting the secondary battery 2.

  When all the temperature sensors 3 for detecting the battery temperature accurately detect the battery temperature, the control circuit 4 calculates the temperature of each battery module from the detected temperature of each temperature sensor as shown in FIG. The remaining capacity is calculated by correcting with the calculated battery temperature, and the charging / discharging of the traveling battery is controlled. When it is determined that a specific temperature sensor has failed, the control circuit 4 detects the temperature sensor that is disposed adjacent to the temperature sensor that has been determined to be faulty. Interpolated from temperature. In FIG. 4, when the second temperature sensor fails and the first, third, and fourth temperature sensors accurately detect the battery temperature, the control circuit 4 determines the temperature detected by the second temperature sensor. The calculation is performed by interpolating from the detected temperatures of other temperature sensors. The control circuit 4 calculates the detected temperature of the second temperature sensor by linearly interpolating from the detected temperatures of the first and third temperature sensors arranged on both sides, as shown by the solid line in FIG. Alternatively, as indicated by a chain line, the temperature of the second temperature sensor can be calculated by interpolation from the detected temperatures of the first, third, and fourth temperature sensors.

  The control circuit 4 interpolates and calculates the temperature of the failed temperature sensor in a state in which the temperature sensor 3 fails, calculates each battery temperature with the calculated temperature, and calculates the secondary temperature with each battery temperature. Calculation is performed while correcting the remaining capacity of the battery 2, and charging / discharging of the traveling battery 1 is controlled with the calculated remaining capacity.

It is a schematic block diagram of the power supply device for vehicles concerning one Example of the present invention. It is a figure which shows the state which a control circuit interpolates and calculates the temperature of all the battery modules. It is a figure which shows the state which battery temperature rises by abnormal heat_generation | fever after a vehicle stops. It is a figure which shows the state which interpolates the detected temperature of the temperature sensor which failed down from the detected temperature of another temperature sensor.

DESCRIPTION OF SYMBOLS 1 ... Battery for driving | running | working 2 ... Secondary battery 3 ... Temperature sensor 4 ... Control circuit 5 ... Failure determination circuit 6 ... Arithmetic circuit 7 ... Cooling mechanism 8 ... Temperature sensor 10 ... Blower fan 11 ... Blower gap 12 ... Inflow duct 13 ... Exhaust duct

Claims (7)

Detects the temperature of the traveling battery (1), which is connected to a plurality of secondary batteries (2), supplying power to the motor that drives the vehicle, and the secondary battery (2) of the traveling battery (1) A plurality of temperature sensors (3), a control circuit (4) for controlling charging / discharging of the traveling battery (1) at the battery temperature detected by the temperature sensors (3), and detection by the plurality of temperature sensors (3) A vehicle power supply device comprising a failure determination circuit (5) for detecting a failure of each temperature sensor (3) from a temperature,
The failure determination circuit (5) is provided with an arithmetic circuit (6) that detects a stop of the vehicle and enters an operation state after a set time that is set longer than the abnormal heat generation of the battery converges. The operation circuit (6) in the operating state calculates each detected temperature detected by each temperature sensor (3), and determines the failure of each temperature sensor (3). Power supply.   The arithmetic circuit (6) of the failure determination circuit (5) has a maximum error temperature for determining a failure from the average value of the detected temperature detected by each temperature sensor (3) and the detected temperature of each temperature sensor (3). The power supply device for a vehicle according to claim 1, wherein the battery temperature sensor (3) having a difference between the detected temperature and the average value larger than the maximum error temperature is determined as a failure.   The arithmetic circuit (6) stores a temperature change characteristic of each temperature sensor (3) that changes when the vehicle is stopped, and determines a failure from the temperature change characteristic and the temperature difference. A power supply device for a vehicle. A cooling mechanism (7) for cooling the traveling battery (1), and a cooling medium temperature sensor (8) for detecting the temperature of the medium in which the cooling mechanism (7) forcibly cools the secondary battery (2). With
The arithmetic circuit (6) calculates each detected temperature that is detected by each temperature sensor (3) when it is in an operating state to determine a failure of each temperature sensor (3). Item 4. A power supply device for a vehicle according to Item 1.   The control circuit (4) calculates and corrects the remaining capacity of the secondary battery (2) to be charged / discharged with the detected temperature of the temperature sensor (3) that detects the temperature of the secondary battery (2). Item 4. A power supply device for a vehicle according to Item 1.   The control circuit (4) detects the temperature sensor (3) detected adjacent to the temperature sensor (3) determined to be faulty, with the temperature detected by the temperature sensor (3) determined to be faulty. The power supply device for a vehicle according to claim 5, wherein the power source device for the vehicle is calculated by interpolating from the temperature and calculating the remaining capacity of the secondary battery (2) at the calculated detected temperature.   The power supply device for a vehicle according to claim 1, wherein the arithmetic circuit (6) detects the stop of the vehicle and enters an operation state after 4 hours or more.

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