JP2009083566A - Method for mounting battery for traveling on hybrid car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a battery for traveling on a hybrid car to optimally control the hybrid car while extending the life of a battery for traveling with memory effects. <P>SOLUTION: The method for mounting a battery for traveling on a hybrid car is provided to mount a battery 1 for traveling on a hybrid car equipped with a motor 3 for running a vehicle; a battery 1 for traveling configured of a nickel hydoride battery 2 which supplies a power to the motor 3; a power generator 4 for charging the battery 1 for traveling; and a control circuit 5 for controlling the charging/discharging of the battery 1 for traveling by detecting the voltage of the battery. This mounting method is provided to mount the battery 1 for traveling on the hybrid car while a substantial capacity can be decreased to 70% or less of a rated capacity by memory effects. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for mounting a traveling battery in a hybrid car, and more particularly to a method for mounting a traveling battery with a substantial reduction in capacity due to a memory effect.

  The hybrid car runs on both the motor and the engine while charging and discharging the battery for running. The motor is driven in a region where engine efficiency is poor, for example, during acceleration or low-speed driving, and improves fuel consumption. The battery for driving the motor is discharged by supplying electric power to the motor, charged by a generator driven by the engine, and charged by driving the generator with regenerative braking energy. In this state, the traveling battery is charged and discharged in a predetermined SOC (remaining capacity) range while repeating charging and discharging. A nickel metal hydride battery used for a battery for traveling has the property of being significantly deteriorated by overcharge and overdischarge. Further, the degree of deterioration increases as the area approaches the overcharge or overdischarge region. From this, a nickel metal hydride battery has a life when charged and discharged from a state where the SOC is completely discharged and the SOC is 0% to a range where the SOC is fully charged and the SOC is 100%, that is, the SOC is 0 to 100%. Becomes shorter. Since a battery for traveling of a hybrid car is required to have a very long life, the SOC range for charging and discharging is limited to a range centering on 50%.

To achieve this, the battery voltage of the battery for driving is detected, and charging is stopped when the battery voltage becomes higher than the preset maximum voltage, and when the battery voltage becomes lower than the controlled minimum voltage, the battery is discharged. Charge / discharge is controlled to stop. That is, the hybrid car detects the battery voltage of the traveling battery with the control circuit, and charges and discharges the battery voltage while limiting the battery voltage to the set voltage range. When the set voltage range of the maximum voltage and the minimum voltage that allow charging / discharging becomes wide, the range of SOC that changes by charging / discharging is widened, and the capacity that can be discharged and the capacity that can be charged increase. That is, the energy that can be traveled by the motor increases, and the capacity that can be charged by regenerative braking increases. However, if the set voltage range is widened and the SOC range to be changed is widened, the battery for traveling approaches the overcharge region and the overdischarge region, and the life is shortened. On the other hand, when the life characteristic of the battery for driving is regarded as important and the range of the SOC that is changed by narrowing the set voltage range is narrowed, the capacity that can be substantially discharged and the capacity that can be charged are reduced. The merit by becomes less. For this reason, the hybrid car considers both the life of the running battery and the merit of the motor, and further sets the set voltage range to an optimum value depending on the type of vehicle. Further, a technique for changing the SOC range to an optimum value depending on the running state has been developed. (See Patent Document 1)
JP 2007-125913 A

  As described above, the traveling battery mounted on the hybrid car charges and discharges with the SOC limited to a predetermined range, so that a memory effect peculiar to the nickel metal hydride battery occurs. The memory effect is a characteristic that the capacity that can be substantially charged and discharged decreases when charging and discharging are repeated within a predetermined set voltage range. FIG. 1 shows a curve A in which the SOC that can be charged and discharged changes when charging and discharging are repeated with the nickel-metal hydride battery limited to a set voltage range. In this figure, when the voltage of the charging battery reaches 1.4V, the charging is stopped and switched to discharging, and when the discharging battery voltage reaches 1.1V, the discharging is stopped and switched to charging repeatedly. The state in which the SOC changes is shown.

  When the nickel hydride battery before the memory effect is generated is charged to 1.4V, the SOC of the battery is about 85%, and when discharged to 1.1V, the SOC of the battery is 25%. Therefore, this battery can be charged and discharged with a substantial capacity of 25% to 85%, that is, 60% of the full charge capacity. When the memory effect occurs in the battery, the battery is charged to 1.4V and discharged to 55%, and discharged to 1.1V and the SOC becomes 45%. Therefore, the SOC that can be charged and discharged while charging and discharging in the same set voltage range is 45% to 55%, and the real capacity is reduced to 10% of the full charge capacity. In this figure, the SOC of the battery can be calculated by integrating the charge / discharge current.

  As shown in this figure, when charging / discharging is repeated so that the voltage of the battery falls within the set voltage range, the nickel-metal hydride battery has a substantial capacity that can be substantially charged / discharged due to the memory effect. Therefore, the battery for running made of nickel metal hydride battery does not have a memory effect when it is first mounted on the vehicle, and has a large substantial capacity that can be charged and discharged. For example, in FIG. 1, the SOC is in the range of about 25% to 85%. Can be charged and discharged. However, as charging / discharging is repeated, the range of the substantial capacity that can be charged / discharged by the memory effect, that is, the SOC, becomes 45% to 55% in spite of charging / discharging in the same set voltage range. Furthermore, the broken line B in FIG. 1 sets the maximum voltage for stopping charging constant, sets the minimum voltage for stopping discharging high, stops charging when the battery voltage increases to the maximum voltage, and the battery voltage reaches the minimum voltage. It shows the characteristic that the SOC changes by repeatedly charging / discharging to stop the discharge when either of the conditions that it is reduced or 20% of the SOC is discharged is satisfied. Furthermore, the alternate long and short dash line C in FIG. 1 sets the minimum voltage for stopping discharge constant, sets the maximum voltage for stopping charging low, stops the discharge when the battery voltage decreases to the maximum voltage, and the battery voltage It shows a characteristic in which the SOC changes by repeating charging / discharging to stop charging when either the maximum voltage is reached or 20% of the SOC is charged. The nickel metal hydride battery having the characteristics indicated by the broken line B due to the memory effect is in a state where the SOC is shifted from 50% in a larger direction. Therefore, this traveling battery can increase the discharge capacity. That is, the energy that can be driven by supplying electric power to the motor can be increased. However, since the capacity that can be charged is reduced, for example, the capacity that can be charged in a state where regenerative braking continues down a long slope is reduced. This state is advantageous for traveling with a motor. On the other hand, the nickel-metal hydride battery that has the characteristics of the alternate long and short dash line C due to the memory effect is in a state where the SOC is shifted from 50% in a smaller direction. Therefore, the battery for traveling can have a large chargeable capacity, but a small capacity can be discharged. Therefore, the energy that can be driven by supplying electric power to the motor is reduced, but the capacity that can be charged in a state where regenerative braking continues down a long slope is increased. That is, it becomes a state advantageous for regenerative braking.

  As described above, advantageous characteristics of the nickel metal hydride battery change due to the memory effect. Therefore, the characteristics that change due to the memory effect may not necessarily be optimal for the characteristics in which the control circuit controls charge / discharge in a state where the characteristics are mounted on the hybrid car. For example, a battery for traveling that has become a broken line B in FIG. 1 due to the memory effect is not optimally used in a hybrid car that is controlled to increase the capacity to be charged by extending regenerative braking. As a result, deterioration of the battery for traveling increases. This shortens the life of a traveling battery that requires a long life. On the other hand, when the battery for traveling that has become the one-dot chain line C due to the memory effect is mounted on a hybrid car that largely controls the capacity for supplying electric power to the motor, the life is shortened.

  An object of the present invention is to provide a method for mounting a traveling battery in a hybrid car that can be mounted in an optimal state for controlling the hybrid car while extending the life of the traveling battery having a memory effect. is there.

A method for mounting a traveling battery in a hybrid car according to the present invention includes a traveling motor 3 that travels a vehicle, a traveling battery 1 that includes a nickel metal hydride battery 2 that supplies electric power to the motor 3, and the traveling battery. 1 is a method in which a traveling battery 1 is mounted in a hybrid car including a generator 4 that charges 1 and a control circuit 5 that controls charging and discharging of the traveling battery 1 by detecting the voltage of the battery. In this mounting method, the traveling battery 1 mounted on the hybrid car is mounted on the hybrid car in a state where the actual capacity is reduced to 70% or less of the rated capacity due to the memory effect.
However, in this specification, the “substantial capacity” of the battery means a capacity that can substantially discharge the battery for traveling from 1.4 V / cell to 1.1 V / cell.

  According to the method of mounting the traveling battery in the hybrid car of the second aspect of the present invention, the traveling battery 1 is mounted on the hybrid car with a substantial capacity reduced to 50% or less of the rated capacity.

  According to the third aspect of the present invention, the battery for traveling is mounted on the hybrid car in a state in which the battery for charging 1 mounted on the hybrid car is charged / discharged within the set voltage range of the highest voltage or the lowest voltage. The actual capacity is reduced by the memory effect so that the center is 50%, and it is mounted on the hybrid car.

  According to a fourth aspect of the present invention, a method for mounting a traveling battery on a hybrid car is performed by charging and discharging the traveling battery 1 mounted on the hybrid car in a state where the voltage is charged / discharged within a set voltage range of a maximum voltage or a minimum voltage. The actual capacity is reduced by the memory effect so that the center is higher than 50% and lower than 70%, and is mounted on the hybrid car.

  According to the fifth aspect of the present invention, there is provided a method for mounting a traveling battery on a hybrid car, in a state in which the traveling battery 1 mounted on the hybrid car is charged and discharged within a set voltage range of a maximum voltage or a minimum voltage. The actual capacity is reduced by the memory effect so that the center is lower than 50% and higher than 40%, and is mounted on the hybrid car.

  In the method of mounting the running battery in the hybrid car according to claim 6 of the present invention, the control circuit 5 stores the maximum voltage for limiting or stopping the charging of the battery, and decreases the maximum voltage with time, The charging current of the traveling battery 1 is controlled.

  In the method for mounting a running battery in a hybrid car according to claim 7 of the present invention, the control circuit 5 stores a minimum voltage for limiting or stopping the discharge of the battery, and increases the minimum voltage over time, The discharge current of the traveling battery 1 is controlled.

  The present invention is characterized in that the traveling battery can be mounted in an optimum state for controlling the hybrid car while extending the life of the traveling battery having a memory effect. This is because the battery for traveling is controlled and mounted to the optimum memory effect in a state where it is mounted on the hybrid car. For example, in a hybrid car that is controlled to increase regenerative braking or a battery that has a long life by charging and discharging in a small SOC region, the SOC range that changes by charging and discharging in the set voltage range due to the memory effect is 50. If the battery is controlled to increase the amount of power supplied to the motor, or conversely has a long SOC and a long life, it is charged and discharged within the set voltage range due to the memory effect. Thus, the range of SOC that changes in this way is set to an area larger than 50%, so that the life of the battery can be extended, and charging and discharging can be performed in an optimum state for a hybrid car.

  According to the method of claim 2 of the present invention, the actual capacity of the traveling battery is reduced to 50% or less of the rated capacity and mounted on the hybrid car. According to this method, when the battery for driving is mounted on the hybrid car, the SOC range to be charged / discharged in the set voltage range is specified by the memory effect, and the battery is suitable for controlling the hybrid car or nickel-metal hydride. It becomes a state suitable for the characteristics of the battery, and the life of the battery can be extended.

  Further, according to the method of claim 3 of the present invention, the center of the SOC is 50% in a state where the battery for driving mounted on the hybrid car is charged / discharged in the set voltage range of the highest voltage to the lowest voltage. The real capacity is reduced by the memory effect and installed in the hybrid car. Since this method charges and discharges within the set voltage range and the center of the SOC is 50%, it is charged and discharged in a well-balanced manner and can be optimally used for a long life in the vicinity of 50%.

  According to a fourth aspect of the present invention, the center of the SOC is higher than 50% and 70 in the state where the battery for driving mounted in the hybrid car is charged / discharged within the set voltage range of the highest voltage to the lowest voltage. The real capacity is reduced by the memory effect so as to be lower than%. According to this method, the battery life can be extended while increasing the amount of power supplied to the motor.

  Further, according to the method of claim 5 of the present invention, the center of the SOC is lower than 50% when the battery for driving mounted in the hybrid car is charged / discharged in the set voltage range of the highest voltage to the lowest voltage. The actual capacity is reduced by the memory effect so that it becomes higher than%, and it is installed in the hybrid car. According to this method, the life of the traveling battery can be extended while increasing the charging capacity of the traveling battery by regenerative braking.

  Furthermore, according to the method of claim 6 of the present invention, the control circuit stores the maximum voltage for limiting or stopping the charging of the battery, and controls the charging current of the traveling battery by decreasing the maximum voltage over time. To do. According to this method, since the SOC range for charging / discharging the battery is gradually limited, the life of the battery can be further extended.

  According to the method of claim 7 of the present invention, the control circuit stores the minimum voltage for limiting or stopping the discharge of the battery and increases the minimum voltage over time to control the discharge current of the traveling battery. To do. This method can further extend the battery life.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a method of mounting a traveling battery on a hybrid car for embodying the technical idea of the present invention, and the present invention mounts the traveling battery on the hybrid car. The method is not specified as the following method.

  Further, in this specification, for easy understanding of the scope of claims, numbers corresponding to the members shown in the embodiments 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.

  FIG. 2 is a block diagram of a hybrid car equipped with the traveling battery 1. The hybrid car in this figure includes a traveling motor 3 for traveling the vehicle, a traveling battery 1 composed of a nickel metal hydride battery 2 for supplying electric power to the motor 3, and a generator 4 for charging the traveling battery 1. And a control circuit 5 that controls charging and discharging of the traveling battery 1 by detecting the voltage of the battery. The traveling battery 1 is connected to the motor 3 and the generator 4 via the inverter 6. The hybrid car travels with an engine (not shown) and a motor 3. The motor 3 is driven when the vehicle is accelerated or when the vehicle is traveling at a low speed to cause the vehicle to travel. The motor 3 is supplied with electric power from the traveling battery 1. When the motor 3 is driven, the SOC of the traveling battery 1 decreases and the voltage decreases. The control circuit 5 detects the battery voltage of the traveling battery 1 and controls the power supplied to the motor 3 with the voltage. Further, when the SOC of the traveling battery 1 decreases and the voltage decreases, the generator 4 is driven. The generator 4 is driven by an engine, or is driven by regenerative braking when the vehicle is braked to charge the traveling battery 1. The battery 1 to be charged is increased in voltage and SOC is increased. The control circuit 5 detects the battery voltage and also controls the charging current. The control circuit 5 controls the output balance between the engine and the motor 3 from the traveling state, and controls charging / discharging of the motor 3 by the voltage of the traveling battery 1.

  The control circuit 5 controls charging / discharging so that the SOC of the traveling battery 1 falls within a set range. The control circuit 5 detects the battery voltage of the traveling battery 1 and controls the charge / discharge current. The control circuit 5 for detecting the battery voltage of the traveling battery 1 detects the total voltage of the traveling battery 1, or detects the voltage of each nickel metal hydride battery 2 constituting the traveling battery 1, or a plurality of The voltage of the battery module in which the nickel metal hydride batteries are connected in series is detected, and charging / discharging of the traveling battery 1 is controlled.

  A battery for running a hybrid car is required to have a very long life of, for example, 10 years. This is because the manufacturing cost is high because of having a large number of batteries, and the replacement cost becomes extremely high. In order to extend the life, the traveling battery controls the SOC range that changes due to charging / discharging, that is, the substantial capacity for substantial charging / discharging to a narrow setting range. However, this use condition is a use condition that promotes the memory effect of the nickel metal hydride battery. The memory effect reduces the substantial capacity that can be substantially charged and discharged while charging and discharging in the same set voltage range. The nickel-metal hydride battery can be charged and discharged so that the SOC is fully charged, that is, fully charged, that is, the SOC changes from 0% to 100%, thereby preventing the memory effect. However, when used in this state, the life of the traveling battery is shortened. Therefore, the hybrid car restricts the range of SOC to be charged and discharged narrowly in order to extend the life of the traveling battery. For this reason, as long as the battery for driving | running | working mounted in a vehicle is a nickel metal hydride battery, the fall of the real capacity by a memory effect cannot be prevented.

  Due to the memory effect, the traveling battery has a substantial capacity that can be substantially charged and discharged while charging and discharging in the same set voltage range. Therefore, in the conventional hybrid car, the actual capacity of the traveling battery gradually decreases from the state of the new car. Further, the characteristics of the battery for traveling, whose actual capacity is reduced by the memory effect, change under the condition of charging / discharging before the memory effect occurs. That is, even if the set voltage range in which charging / discharging is allowed to be the same, the SOC range that can be charged / discharged changes. A traveling battery in which charging and discharging are repeated in a region where the SOC is large, in other words, a region close to full charge, has a large SOC range that changes with the same set voltage range. On the other hand, if the charge / discharge is performed in a region where the SOC is small, the range of the SOC that changes with the same set voltage range is reduced.

  FIG. 1 shows a characteristic that the SOC changes due to the memory effect by a curve A, a broken line B, and a one-dot chain line C. Curve A shows the characteristics of a nickel-metal hydride battery in which the memory effect is generated by repeatedly charging and discharging in the set voltage range of the lowest voltage 1.1V to the highest voltage 1.4V. In addition, the broken line B indicates that the maximum voltage of 1.4 V is constant and the minimum voltage is higher than 1.1 V, and charging is stopped when the battery voltage increases to the maximum voltage, and the battery voltage decreases to the minimum voltage, Alternatively, the characteristics of the nickel-metal hydride battery in which the memory effect is generated by repeating charge / discharge that stops discharge when 20% of the SOC is discharged are satisfied. Furthermore, the alternate long and short dash line C makes the minimum voltage of 1.1V constant and the maximum voltage higher than 1.4V. When the battery voltage decreases to the minimum voltage, the discharge stops and the battery voltage increases to the maximum voltage. Alternatively, the characteristics of the nickel-metal hydride battery in which the memory effect is generated by repeating charging / discharging for stopping charging when either of the conditions that 20% of SOC is charged are satisfied. As shown in this figure, the battery for traveling is charged / discharged in the same set voltage range in a state where the real capacity is reduced due to the memory effect by changing the charging / discharging conditions, thereby changing the range in which the SOC changes. it can.

  Due to the memory effect, the traveling battery having the characteristics indicated by the broken line B can be charged / discharged in the same set voltage range, and the center of the SOC can be set to a region higher than 50%. This battery for traveling is suitable for a hybrid car that is controlled so as to increase the amount of electric power that can be supplied to the motor because the discharge capacity until complete discharge with SOC of 0% can be increased. When a hybrid car steps on an accelerator and accelerates the vehicle with an engine and a motor, the hybrid car supplies power from the running battery to the motor and discharges the running battery. At this time, in the control circuit that keeps the output of the motor long, the discharge power amount of the traveling battery becomes large. For this reason, the hybrid car that controls the traveling battery in this state increases the amount of electric power that can be discharged. Therefore, as shown by the broken line B, the battery for driving mounted in this hybrid car is charged / discharged so that the center of the SOC becomes larger than 50% by charging / discharging in the set voltage range due to the memory effect, Installed in a hybrid car as a result of a substantial reduction in capacity. The battery for driving mounted on this hybrid car has a SOC center higher than 50% and lower than 70% in a state where the voltage is charged / discharged within a set voltage range of 1.4 V / cell to 1.1 V / cell. Thus, the life of the traveling battery can be extended while increasing the output of the motor by reducing the substantial capacity by the memory effect.

  Therefore, in a hybrid car that controls to increase the amount of electric power supplied to the motor, the center of the SOC is about 50% or more and more than 70% in a state where the traveling battery is charged / discharged in the set voltage range. The actual capacity is reduced to 70% or less, preferably 50% or less, more preferably 30% or less of the rated capacity by the memory effect, and then mounted on the hybrid car.

  The battery for traveling is mounted on the hybrid car with a substantial capacity reduced by the memory effect, but the battery can be mounted in an optimal state on the hybrid car as the substantial capacity is decreased. However, the smaller the actual capacity is, the more times the traveling battery is charged and discharged. Therefore, in consideration of the number of times of charging / discharging until the battery is mounted on the hybrid car and the required memory effect, the traveling battery is mounted on the hybrid car with the actual capacity as an optimum value.

  Moreover, the battery for driving | running | working which became the characteristic shown with the dashed-dotted line C by the memory effect can be charged / discharged in the same setting voltage range, and can set the center of SOC to the area | region lower than 50%. Since this traveling battery can increase the charging capacity up to full charge with an SOC of 100%, the charging capacity of the traveling battery is increased in regenerative braking or the like, that is, the energy of long regenerative braking is efficiently supplied to the traveling battery. Suitable for hybrid cars that are controlled to store. When a hybrid car steps on a brake and performs regenerative braking, a battery for traveling is charged by a generator. At this time, in the control circuit that continues to step on the brake and increases the charging capacity of the traveling battery with the energy of regenerative braking, the charging power amount of the traveling battery increases. For this reason, the amount of electric power that can be charged by the hybrid car that controls the battery for traveling in this state increases. Therefore, as shown by the alternate long and short dash line C, the battery for traveling mounted on this hybrid car is charged / discharged by the memory effect so that the center of the SOC becomes less than 50% by charging / discharging in the set voltage range, Installed in a hybrid car as the actual capacity is reduced due to the memory effect.

  This battery for traveling has a memory effect such that the center of the SOC is lower than 50% and higher than 40% in a state where the voltage is charged / discharged in the set voltage range of 1.4 V / cell to 1.1 V / cell. It is possible to extend the life of the traveling battery while increasing the charging capacity of the traveling battery by regenerative braking by reducing the substantial capacity and mounting the hybrid car.

  Therefore, in a hybrid car that is controlled so as to increase the charging capacity of regenerative braking, the center of the SOC is lower than about 50% and higher than 40% in a state where the traveling battery is charged and discharged within the set voltage range. In addition, the actual capacity is reduced to 70% or less, preferably 50% or less, more preferably 30% or less of the rated capacity by the memory effect, and then mounted on the hybrid car.

  Furthermore, the traveling battery having the characteristic indicated by the curve A due to the memory effect can be charged and discharged within the same set voltage range, and the center of the SOC can be set to 50%. Since this battery for traveling can balance the discharge capacity for completely discharging until the SOC becomes 0% and the charging capacity until the SOC is 100%, the amount of electric power supplied to the motor and regenerative braking This is suitable for a hybrid car that controls the capacity for charging the battery for traveling in a well-balanced manner. Therefore, in a hybrid car that controls the amount of power supplied to the motor and the regenerative braking charge capacity in a well-balanced manner, the center of the SOC is set to about 50% in a state where the battery is charged / discharged within the set voltage range, In addition, the actual capacity is reduced to 70% or less, preferably 50% or less, more preferably 30% or less of the rated capacity by the memory effect, and then mounted on the hybrid car.

It is a graph which shows the state from which SOC of a nickel metal hydride battery changes by charging / discharging. It is a block diagram which shows an example of the hybrid car carrying a battery for driving | running | working.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery for driving | running | working 2 ... Nickel metal hydride battery 3 ... Motor 4 ... Generator 5 ... Control circuit 6 ... Inverter

Claims (7)

A traveling motor (3) for traveling the vehicle, a traveling battery (1) composed of a nickel metal hydride battery (2) for supplying electric power to the motor (3), and power generation for charging the traveling battery (1) A battery for traveling in a hybrid car comprising a machine (4) and a control circuit (5) for detecting and controlling the voltage of the battery for charging and discharging of the battery for traveling (1),
The battery for traveling (1) mounted on the hybrid car is mounted on the hybrid car in a state where the actual capacity is reduced to 70% or less of the rated capacity due to the memory effect. How to install.   The method for mounting a traveling battery on a hybrid car according to claim 1, wherein the traveling battery (1) is mounted on a hybrid car with a substantial capacity reduced to 50% or less of a rated capacity.   In a state where the battery (1) for driving mounted on the hybrid car is charged / discharged within the set voltage range of the highest voltage to the lowest voltage, the actual capacity is reduced by the memory effect so that the center of the SOC becomes 50%. A method for mounting a running battery on a hybrid car according to claim 1 mounted on a hybrid car.   Memory effect so that the center of the SOC is higher than 50% and lower than 70% in the state where the voltage (1) of the battery mounted on the hybrid car is charged / discharged within the set voltage range of the highest voltage to the lowest voltage. The method for mounting a traveling battery on a hybrid car according to claim 1, wherein the battery is mounted on the hybrid car with a reduced substantial capacity.   Memory effect so that the center of the SOC is lower than 50% and higher than 40% in a state in which the battery (1) for driving mounted on the hybrid car is charged / discharged within the set voltage range of the highest voltage to the lowest voltage. The method for mounting a traveling battery on a hybrid car according to claim 1, wherein the battery is mounted on the hybrid car with a reduced substantial capacity.   The control circuit (5) stores the maximum voltage for limiting or stopping the charging of the battery, and controls the charging current of the traveling battery (1) by decreasing the maximum voltage over time. A method of mounting a running battery on a hybrid car as described.   The control circuit (5) stores a minimum voltage for limiting or stopping the discharge of the battery, and controls the discharge current of the traveling battery (1) by increasing the minimum voltage over time. A method of mounting a running battery on a hybrid car as described.

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