JP4108655B2 - Battery control device and battery temperature control method - Google Patents

Description

  The present invention relates to a battery control device and a battery temperature control method.

  2. Description of the Related Art Conventionally, a battery control device that supplies battery power to a drive motor in a vehicle is known. When the battery is charged and discharged, it generates heat according to the amount of current.

  When the battery reaches a predetermined temperature or higher, decomposition of the electrolyte begins, and the life and performance deteriorate. Conventionally, a technique for suppressing deterioration of a battery due to high temperature is known.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-209789) discloses charge / discharge control that suppresses heat generation of a battery by reducing current flowing through the battery and suppressing deterioration of the battery due to high temperature when the temperature of the battery rises. An apparatus is described.

  In Patent Document 2 (Japanese Patent Laid-Open No. 2003-132956), when the temperature of the battery rises, the amount of power (specifically, current) supplied by the battery to the load is reduced to suppress the heat generation of the battery, and the temperature is increased. A discharge control device that suppresses the deterioration of the resulting battery is described.

  In addition, a cooling system for managing the battery temperature is added to a battery that may be used under a dangerous high temperature that deteriorates the life and performance of the battery in order to suppress the deterioration of the battery due to the high temperature. Sometimes.

  In addition, since the battery uses a chemical reaction, when the temperature becomes low, the speed of the chemical reaction decreases and the power that can be output decreases. Conventionally, a technique for suppressing a decrease in output power due to low temperature is known.

Patent Document 3 (Japanese Patent Laid-Open No. 11-355967) describes a battery control device that increases a state of charge (SOC) of a battery at a low temperature and suppresses a decrease in output power at a low temperature. Yes. The SOC also indicates the battery charge rate.
JP 2003-209789 A JP 2003-132958 A JP 11-355967 A

  In the technique described in Patent Literature 1, when the temperature of the battery rises, the current flowing through the battery becomes small. Therefore, the power supplied to the load by the amount of the reduced current is reduced. The power required from the accelerator or the like cannot be output. For this reason, the problem that operation | movement of the drive part which operate | moves using the output electric power of a battery will become unstable arises.

  In the technique described in Patent Document 2, since the amount of electric power (specifically, current) supplied from the battery to the load decreases when the temperature of the battery rises, the battery is a vehicle as in the technique described in Patent Document 1. Therefore, there is a problem that the power required from the accelerator or the like cannot be output, and the operation of the drive unit using the output power of the battery becomes unstable.

  Moreover, when managing the temperature of a battery using a cooling system, if the emitted-heat amount of a battery becomes large, a cooling system will enlarge.

  Further, with the technique described in Patent Document 3, it is possible to suppress a decrease in output power at a low temperature, but it is difficult to increase the temperature of a battery in a low temperature state.

  An object of the present invention is to provide a battery control device and a battery temperature control method capable of controlling the amount of heat generated by a battery according to the temperature of the battery while the output power of the battery maintains the required power.

  Another object of the present invention is to provide a battery control device and a battery temperature control method capable of suppressing the heat generation amount of the battery while maintaining the required output power of the battery when the battery becomes high temperature. Is to provide.

  Still another object of the present invention is to provide a battery control device and a battery temperature control method capable of preventing an increase in size of a battery cooling system.

  Still another object of the present invention is to provide a battery control device and a battery temperature control method capable of promoting the amount of heat generated by the battery while maintaining the required output power of the battery when the battery becomes low temperature. Is to provide.

  In order to achieve the above object, a battery control device according to the present invention includes a battery whose voltage increases in accordance with an increase in SOC, a temperature detection unit that detects the temperature of the battery, and a battery that is detected by the temperature detection unit. When the temperature is lower than the predetermined temperature, charging / discharging of the battery is controlled so that the SOC of the battery is included in the first SOC region. When the temperature of the battery is equal to or higher than the predetermined temperature, the SOC of the battery is A control unit that controls charging / discharging of the battery so as to be included in a second SOC region that is higher than the first SOC region, a required power information receiving unit that receives necessary power information indicating the required power, and The current at the time of acquiring the electric power indicated by the necessary electric power information from the battery, which is an SOC according to the temperature of the battery under the control of the control unit, is the voltage of the battery And a power acquisition unit to change accordingly.

  The battery temperature control method of the present invention includes a temperature detection step for detecting a temperature of a battery whose voltage increases with an increase in SOC, and when the battery temperature detected in the temperature detection step is less than a predetermined temperature, The charging / discharging of the battery is controlled so that the SOC of the battery is included in the first SOC region, and when the temperature of the battery is equal to or higher than the predetermined temperature, the second SOC is higher than the first SOC region. A control step for controlling charging / discharging of the battery so as to be included in the SOC region, a necessary power information receiving step for receiving necessary power information indicating the required power, and a control of the control unit to control the battery temperature. Depending on the voltage of the battery, the current at the time of obtaining the power indicated by the required power information from the battery that is the SOC Further to include a power acquisition step.

  According to the above invention, when the battery temperature is lower than the predetermined temperature, the battery SOC is included in the first SOC region, and when the battery temperature is equal to or higher than the predetermined temperature, the battery SOC is the first SOC region. It is included in the second SOC region higher than the SOC region.

  Since the voltage of the battery increases as the SOC increases, the average voltage of the battery is higher when the battery temperature is equal to or higher than the predetermined temperature than when the battery temperature is lower than the predetermined temperature. Therefore, when the power indicated by the required power information is acquired from the battery, the average current acquired from the battery is smaller when the battery temperature is equal to or higher than the predetermined temperature than when the battery temperature is lower than the predetermined temperature. Since the amount of heat generated by the battery is proportional to the square of the current, the amount of heat generated by the battery is smaller when the temperature of the battery is above the predetermined temperature than when the temperature of the battery is lower than the predetermined temperature.

  Therefore, when the battery becomes high temperature, it is possible to suppress the heat generation amount of the battery while maintaining the required output power of the battery, and when the battery becomes low temperature, the output power of the battery is required. It is possible to promote the amount of heat generated by the battery while maintaining the electric power.

  Moreover, since it becomes possible to suppress the emitted-heat amount of a battery when a battery becomes high temperature, it becomes possible to prevent the enlargement of a battery cooling system.

  It is desirable that the width of the first SOC region is wider than the width of the second SOC region.

  According to the above invention, since the width of the first SOC region is wider than the width of the second SOC region, the power that can be extracted from the battery is larger when the battery temperature is lower than the predetermined temperature than when the battery temperature is equal to or higher than the predetermined temperature. Become. For this reason, it becomes possible to suppress that the output electric power of a battery falls by the fall of battery temperature.

  When the temperature of the battery detected by the temperature detection unit is lower than a predetermined temperature, it is desirable to gradually lower the first SOC region as the temperature of the battery decreases.

  According to the above invention, it is possible to gradually increase the amount of heat generated by the battery as the battery temperature decreases while the output power of the battery maintains the required power. For this reason, it can suppress that the emitted-heat amount of a battery becomes large more than necessary.

  In the battery control apparatus, the control unit may further include a second step in which the SOC of the battery is higher than the second SOC region when the temperature of the battery detected by the temperature detection unit is equal to or higher than a specific temperature higher than the predetermined temperature. The charging / discharging of the battery is controlled so as to be included in the SOC region of 3. When the temperature of the battery is equal to or higher than the predetermined temperature and lower than the specific temperature, the SOC of the battery is included in the second SOC region. Thus, it is desirable to control charging and discharging of the battery.

  In the battery temperature control method, in the control step, when the temperature of the battery detected in the temperature detection step is equal to or higher than a specific temperature higher than the predetermined temperature, the SOC of the battery is higher than the second SOC region. The charging / discharging of the battery is controlled to be included in the third SOC region, and when the temperature of the battery is equal to or higher than the predetermined temperature and lower than the specific temperature, the SOC of the battery is included in the second SOC region. It is desirable to control charging / discharging of the battery.

  According to the above invention, when the battery temperature is equal to or higher than the specific temperature higher than the predetermined temperature, the charge amount of the battery is included in the third SOC region higher than the second SOC region, and the battery When the temperature is equal to or higher than the predetermined temperature and lower than the specific temperature, the charge amount of the battery is included in the second SOC region. For this reason, when the battery becomes high temperature, it becomes possible to suppress the heat generation amount of the battery while maintaining the required output power of the battery, and when the battery becomes low temperature, the output power of the battery is reduced. It is possible to promote the amount of heat generated by the battery while maintaining the required power.

  According to the present invention, when the temperature of the battery is lower than the predetermined temperature, the SOC of the battery is included in the first SOC region, and when the temperature of the battery is equal to or higher than the predetermined temperature, the SOC of the battery is the first SOC. The second SOC region is higher than the region.

  Since the voltage of the battery increases as the SOC increases, the average voltage of the battery is higher when the battery temperature is equal to or higher than the predetermined temperature than when the battery temperature is lower than the predetermined temperature. Therefore, when the power indicated by the required power information is acquired from the battery, the average current acquired from the battery is smaller when the battery temperature is equal to or higher than the predetermined temperature than when the battery temperature is lower than the predetermined temperature. Since the amount of heat generated by the battery is proportional to the square of the current, the amount of heat generated by the battery is smaller when the temperature of the battery is above the predetermined temperature than when the temperature of the battery is lower than the predetermined temperature.

  Therefore, when the battery becomes high temperature, it is possible to suppress the heat generation amount of the battery while maintaining the required output power of the battery, and when the battery becomes low temperature, the output power of the battery is required. It is possible to promote the amount of heat generated by the battery while maintaining the electric power.

  Moreover, since it becomes possible to suppress the emitted-heat amount of a battery when a battery becomes high temperature, it becomes possible to prevent the enlargement of a battery cooling system.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a hybrid electric vehicle using a battery control device according to an embodiment of the present invention.

  In FIG. 1, a hybrid electric vehicle includes a battery 1, a temperature detection unit 2, an SOC sensor 3, a control unit 4, an accelerator 5, an inverter 6, an engine 7, a generator 8, and a rectifier. 9, an engine power generation unit controller 10, a motor 11, a speed reducer 12, and a tire 13. The battery 1, the temperature detection unit 2, the control unit 4, the accelerator 5, and the inverter 6 are included in the battery control device.

  The battery 1 is, for example, a lithium ion battery, and a battery whose voltage increases as the amount of charge increases. The battery 1 is not limited to a lithium ion battery, and may be a battery whose voltage increases with an increase in charge amount.

  The temperature detection unit 2 is a temperature sensor, for example, and detects the temperature of the battery 1.

  The SOC sensor 3 detects information necessary for detecting the SOC of the battery 1. In the present embodiment, the SOC sensor 3 includes a voltmeter that detects the voltage of the battery 1 and an ammeter that detects a current flowing through the battery 1. Note that the SOC described below indicates the charging rate of the battery 1, but this SOC may be read as the amount of charge of the battery.

  The control unit 4 calculates the SOC of the battery 1 based on the detection result of the SOC sensor 3. For example, the control unit 4 calculates the SOC of the battery 1 based on the integrated value of the current detected by the ammeter in the SOC sensor 3 and the voltage detected by the voltmeter in the SOC sensor 3.

  Control unit 4 controls charging / discharging of battery 1 so that the SOC of battery 1 is within a predetermined SOC region.

  For example, when the SOC of the battery 1 calculated by the control unit 4 based on the detection result of the SOC sensor 3 reaches a lower limit value of a predetermined SOC region, the control unit 4 outputs a charge signal to the engine power generation unit controller 10 to output the battery. 1 is instructed to charge. Further, when the SOC of the battery 1 calculated by itself based on the detection result of the SOC sensor 3 reaches the upper limit value of the predetermined SOC region, the control unit 4 outputs a charge stop signal to the engine power generation unit controller 10. Instructing the battery 1 to discharge.

  Further, the control unit 4 changes a predetermined SOC region according to the temperature of the battery 1 detected by the temperature detection unit 2.

  Specifically, control unit 4 controls charging / discharging of battery 1 such that the SOC of battery 1 is included in the first SOC region when the temperature of battery 1 detected by temperature detection unit 2 is lower than a predetermined temperature. When the temperature of the battery 1 is equal to or higher than the predetermined temperature, the charging / discharging of the battery 1 is controlled so that the SOC of the battery 1 is included in the second SOC region higher than the first SOC region.

  For example, when the temperature of the battery 1 detected by the temperature detection unit 2 is less than a predetermined temperature (for example, 35 degrees C.) as the minimum battery temperature at which the amount of heat generated by the battery 1 is desired to be suppressed, the control unit 4 determines the SOC of the battery 1. Is controlled to be included in the region between SOC 30% and SOC 70% (first SOC region), and when the temperature of the battery 1 is 35 degrees C or higher, the SOC of the battery 1 is SOC 60%. The charging / discharging of the battery 1 is controlled so as to be included in the region between the SOC of 80% (second SOC region).

  Note that the predetermined temperature as the minimum battery temperature at which the amount of heat generated by the battery 1 is desired to be suppressed is not limited to 35 degrees C and can be changed as appropriate. If the second SOC region is higher than the first SOC region, The first and second SOC regions can be changed as appropriate.

  In addition, when the temperature of the battery 1 detected by the temperature detection unit 2 is lower than a predetermined temperature (for example, 0 degree C) as the maximum battery temperature at which the heat generation of the battery 1 is desired to be promoted, the control unit 4 Is controlled to be included in the region between SOC 20% and SOC 60% (first SOC region). When the temperature of battery 1 is 0 ° C. or higher, the SOC of battery 1 is SOC 60%. The charging / discharging of the battery 1 may be controlled so as to be included in the region between the SOC of 80% (second SOC region). In this case, the predetermined temperature as the maximum battery temperature at which the heat generation of the battery 1 is desired to be promoted is not limited to 0 ° C. and can be changed as appropriate, and if the second SOC region is higher than the first SOC region. The first and second SOC regions can be changed as appropriate.

  The accelerator 5 as a required power information receiving unit is operated by a user and receives required power information indicating the required power. The accelerator 5 supplies the received required power information to the control unit 4. The control unit 4 outputs necessary power information supplied from the accelerator 5 to the inverter 6.

  The inverter 6 as the power acquisition unit changes the current acquired from the battery 1 according to the voltage of the battery 1, in other words, according to the SOC of the battery 1, and indicates the power indicated by the required power information received by the accelerator 5. Is obtained from the battery 1.

  When the temperature of the battery 1 is lower than the predetermined temperature, the SOC of the battery 1 is included in the first SOC region. When the temperature of the battery 1 is higher than the predetermined temperature, the SOC of the battery 1 is higher than that of the first SOC region. Since it is included in the high second SOC region, the average voltage of the battery 1 becomes higher when the temperature of the battery is equal to or higher than the predetermined temperature than when the temperature of the battery is lower than the predetermined temperature.

  For this reason, the average current acquired from the battery 1 when the inverter 6 acquires the power indicated in the necessary power information from the battery 1 is higher than the temperature when the temperature of the battery 1 is lower than the predetermined temperature. The amount of heat generated by the battery 1 is smaller when the temperature of the battery 1 is equal to or higher than the predetermined temperature than when the temperature of the battery 1 is lower than the predetermined temperature. Note that the amount of heat generated by the battery 1 is proportional to the square of the current flowing through the battery 1.

  The inverter 6 converts the power acquired from the battery 1 into AC power and applies it to the motor 11.

  The engine 7 is an internal combustion engine such as a gasoline engine or a diesel engine, for example. The generator 8 is driven by the engine 7 to generate AC power. The rectifier 9 converts AC power generated by the generator into DC power. When the generator 8 generates DC power, the rectifier 9 can be omitted.

  The electric power output from the rectifier 9 is supplied to the battery 1, and the battery 1 charges this electric power. Further, the power output from the rectifier 9 is also supplied to the inverter 6, converted into AC power by the inverter 6, and applied to the motor 11.

  When the charging signal is supplied from the control unit 4, the engine power generation unit controller 10 operates the engine 7 and the generator 8 to charge the battery 1, and when the charging stop signal is supplied from the control unit 4. Then, the engine 7 and the generator 8 are stopped and the battery 1 is discharged.

  The motor 11 is driven by AC power supplied from the inverter 6. The output shaft of the motor 11 is connected to the tire 13 via the speed reducer 12.

  Next, the operation will be described.

  FIG. 2 is a flowchart for explaining the operation of the battery control device. Hereinafter, the operation of the battery control apparatus will be described with reference to FIG.

  In step 21, the control unit 4 receives the temperature of the battery 1 detected by the temperature detection unit 2, detects the temperature of the battery 1, and then proceeds to step 22.

  In step 22, if the temperature of the battery 1 is less than a predetermined temperature (the minimum battery temperature at which the amount of heat generated by the battery 1 is desired to be suppressed, for example, 35 degrees C), the control unit 4 proceeds to step 23 and the temperature of the battery 1 is increased. If the temperature is equal to or higher than the predetermined temperature, the process proceeds to step 24.

  In step 23, control unit 4 sets a first SOC region (a region between SOC 30% and SOC 70%) as the predetermined SOC region. Thereafter, the control unit 4 sends the charge signal and the charge stop signal to the engine so that the SOC of the battery 1 calculated by itself based on the detection result of the SOC sensor 3 is included in the region between the first SOC regions. The battery 1 is appropriately output to the power generation unit controller 10 to control charging / discharging of the battery 1.

  In step 24, control unit 4 sets a second SOC area (an area between SOC 60% and SOC 80%) as the predetermined SOC area. Thereafter, the control unit 4 outputs the charge signal and the charge stop signal so that the SOC of the battery 1 calculated by itself based on the detection result of the SOC sensor 3 is included in the region between the second SOC regions. The battery 1 is appropriately output to the power generation unit controller 10 to control charging / discharging of the battery 1.

  When the temperature of the battery 1 is lower than the predetermined temperature, the SOC of the battery 1 is included in the first SOC region, and when the temperature of the battery 1 is higher than the predetermined temperature, the SOC of the battery 1 is higher than the first SOC region. Therefore, the average voltage of the battery 1 is higher when the temperature of the battery is equal to or higher than the predetermined temperature than when the temperature of the battery is lower than the predetermined temperature.

  In step 25, when the battery 1 is in a discharged state, the inverter 6 changes the current acquired from the battery 1 in accordance with the voltage of the battery 1, and the power indicated by the required power information received by the accelerator 5 from the battery 1. get.

  When the inverter 6 acquires the power indicated by the required power information from the battery 1, the average current acquired from the battery 1 is smaller when the battery temperature is higher than the predetermined temperature than when the battery temperature is lower than the predetermined temperature. The calorific value of 1 is smaller when the temperature of the battery is above the predetermined temperature than when it is below the predetermined temperature. For this reason, when the predetermined temperature is set to the minimum battery temperature at which the amount of heat generated by the battery 1 is desired to be suppressed, when the temperature of the battery 1 becomes equal to or higher than the predetermined temperature, the output power of the battery maintains the required power and the heat of the battery 1 is generated. The amount is suppressed. Therefore, it is possible to prevent the battery cooling system from becoming large.

  In the control unit 4, a maximum battery temperature (for example, 0 degree C) that is desired to promote heat generation of the battery 1 is set as the predetermined temperature, and an area between SOC 20% and SOC 60% is used as the first SOC area. When a region between SOC 60% and SOC 80% is used as the second SOC region, when the temperature of the battery 1 becomes lower than a predetermined temperature, the heat generation of the battery 1 is promoted while the output power of the battery 1 maintains the required power. The

  In this case, the self-heating of the battery 1 makes it possible to increase the temperature of the battery 1 in a short time to a temperature at which the battery 1 can exhibit the designed performance.

  Moreover, since the control part 4 makes the width | variety of the 1st SOC area | region wider than the width | variety of a 2nd SOC area | region, the electric power which the inverter 6 can take out from the battery 1 is compared with the time when the temperature of the battery 1 is more than predetermined temperature. It becomes larger when the temperature is lower than the predetermined temperature. For this reason, it becomes possible to suppress that the output electric power of the battery 1 falls by the fall of the temperature of the battery 1. FIG.

  Conventionally, since the internal resistance of the battery 1 becomes very large at low temperatures, there is a possibility that the battery 1 may not be able to absorb the regenerative energy of the vehicle. In this embodiment, the temperature of the battery 1 is increased. Since the voltage of the battery 1 decreases when the temperature becomes lower than the predetermined temperature, the amount of regenerative energy absorbed by the battery 1 can also be increased.

  When the temperature of the battery 1 detected by the temperature detection unit 2 is lower than a predetermined temperature, the control unit 4 may gradually lower the first SOC region as the temperature of the battery 1 decreases. Good.

  FIG. 3 illustrates an example of an operation in which the control unit 4 gradually lowers the first SOC region as the temperature of the battery 1 decreases when the temperature of the battery 1 is lower than a predetermined temperature. It is explanatory drawing.

  When the temperature of battery 1 is equal to or higher than a predetermined temperature (0 degree C in FIG. 3), control unit 4 sets a second SOC region (a region between SOC 60% and SOC 80%) as the predetermined SOC region.

  When the temperature of battery 1 falls below a predetermined temperature (0 degrees C in FIG. 3), control unit 4 sets the first SOC region as the predetermined SOC region. At this time, the control unit 4 gradually lowers the first SOC region as the temperature of the battery 1 decreases. In this case, it is possible to gradually increase the amount of heat generated by the battery 1 as the temperature of the battery 1 decreases while the output power of the battery 1 maintains the required power. For this reason, it can suppress that the emitted-heat amount of the battery 1 becomes large more than necessary. In the example illustrated in FIG. 3, the control unit 4 fixes the first SOC region when the temperature of the battery 1 becomes −15 degrees C or lower.

  In addition, when the temperature of the battery 1 detected by the temperature detection unit 1 is equal to or higher than a specific temperature, the control unit 4 further includes a third SOC region in which the charge amount of the battery 1 is higher than the second SOC region. The charging / discharging of the battery 1 is controlled so that the charging amount of the battery 1 is included in the second SOC region when the temperature of the battery 1 is equal to or higher than the predetermined temperature and lower than the specific temperature. May be controlled.

  FIG. 4 is a flowchart for explaining an example of an operation in which the control unit 4 switches the predetermined SOC region in three stages according to the temperature of the battery 1. Hereinafter, with reference to FIG. 4, an operation in which the control unit 4 switches the predetermined SOC region in three stages according to the temperature of the battery 1 will be described.

  In step 41, the control unit 4 receives the temperature of the battery 1 detected by the temperature detection unit 2, detects the temperature of the battery 1, and then proceeds to step 42.

  In step 22, if the temperature of the battery 1 is lower than a predetermined temperature (the maximum battery temperature (for example, 0 degree C) at which the heat generation of the battery 1 is desired to be promoted), the control unit 4 proceeds to step 43 and the temperature of the battery 1 is equal to or higher than the predetermined temperature. If so, go to Step 44.

  In step 43, control unit 4 sets a first SOC region (a region between SOC 20% and SOC 60%) as the predetermined SOC region. Thereafter, the control unit 4 appropriately sets the charge signal and the charge stop signal so that the SOC of the battery 1 calculated by the control unit 4 based on the detection result of the SOC sensor 3 is included in the region between the first SOC regions. It outputs to the engine power generation unit controller 10 and controls charging / discharging of the battery 1.

  In step 44, if the temperature of the battery 1 is lower than the specific temperature (the minimum battery temperature (for example, 35 degrees C) at which the heat generation of the battery 1 is desired to be suppressed), the control unit 4 proceeds to step 45 and the temperature of the battery 1 is equal to or higher than the specific temperature. If so, go to Step 46.

  In step 45, control unit 4 sets a second SOC area (an area between SOC 30% and SOC 70%) as the predetermined SOC area. Thereafter, the control unit 4 appropriately sets the charge signal and the charge stop signal so that the SOC of the battery 1 calculated by the control unit 4 based on the detection result of the SOC sensor 3 is included in the region between the second SOC regions. It outputs to the engine power generation unit controller 10 and controls charging / discharging of the battery 1.

  In step 46, control unit 4 sets a third SOC region (a region between SOC 60% and SOC 80%) as the predetermined SOC region. After that, the control unit 4 appropriately sets the charge signal and the charge stop signal so that the SOC of the battery 1 calculated by itself based on the detection result of the SOC sensor 3 is included in the region between the third SOC regions. It outputs to the engine power generation unit controller 10 and controls charging / discharging of the battery 1.

  In step 47, when the battery 1 is in a discharged state, the inverter 6 changes the current acquired from the battery 1 in accordance with the voltage of the battery 1, and the power indicated by the required power information received by the accelerator 5 from the battery 1. get.

  If the specific temperature is higher than the predetermined temperature, the specific temperature and the predetermined temperature can be changed as appropriate, and if the relationship of the first SOC region <second SOC region <third SOC region is satisfied, The first SOC region, the second SOC region, and the third SOC region can be appropriately changed.

  When the control unit 4 switches the predetermined SOC region in three stages according to the temperature of the battery 1, the battery 1 suppresses heat generation when the battery 1 is at a high temperature (above a specific temperature), and the battery is at a low temperature (below the predetermined temperature). ), The heat generation of the battery 1 can be promoted.

  In addition, if the control unit 4 has hysteresis between the predetermined temperature and the specific temperature, when the temperature detected by the temperature sensor 2 fluctuates in the vicinity of the predetermined temperature or in the vicinity of the specific temperature, the SOC region change frequency increases. It is possible to prevent this problem.

  In the embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

It is the block diagram which showed the battery control apparatus of one Example of this invention. 3 is a flowchart for explaining the operation of the battery control device shown in FIG. 1. It is explanatory drawing for demonstrating another example of operation | movement of the battery control apparatus shown in FIG. 6 is a flowchart for explaining another example of the operation of the battery control device shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 2 Temperature detection part 3 SOC sensor 4 Control part 5 Accelerator 6 Inverter 7 Engine 8 Generator 9 Rectifier 10 Engine power generation unit controller 11 Motor 12 Reducer 13 Tire

Claims (8)

A battery whose voltage increases with increasing SOC;
A temperature detector for detecting the temperature of the battery;
When the temperature of the battery detected by the temperature detection unit is lower than a predetermined temperature, charge / discharge of the battery is controlled so that the SOC of the battery is included in the first SOC region, and the temperature of the battery is equal to or higher than the predetermined temperature. In this case, a control unit that controls charging / discharging of the battery so that the SOC of the battery is included in a second SOC region higher than the first SOC region;
A required power information receiving unit that receives required power information indicating required power; and
A power acquisition unit that changes a current when acquiring the power indicated by the required power information from the battery, which is an SOC according to the temperature of the battery by the control of the control unit, according to the voltage of the battery; Including battery control device. The battery control device according to claim 1,
The battery control device, wherein the control unit makes a width of the first SOC region wider than a width of the second SOC region. The battery control device according to claim 2,
The control unit is configured to gradually lower the first SOC region as the battery temperature decreases when the temperature of the battery detected by the temperature detection unit is lower than a predetermined temperature. The battery control device according to claim 1,
The control unit further includes a third SOC region in which the SOC of the battery is higher than the second SOC region when the temperature of the battery detected by the temperature detection unit is equal to or higher than a specific temperature higher than the predetermined temperature. Charge / discharge of the battery is controlled so that when the temperature of the battery is equal to or higher than the predetermined temperature and lower than the specific temperature, the charge / discharge of the battery is included so that the SOC of the battery is included in the second SOC region. A battery control device that controls discharging. A temperature detecting step for detecting a temperature of the battery whose voltage increases in accordance with an increase in SOC;
When the temperature of the battery detected in the temperature detection step is lower than a predetermined temperature, charge / discharge of the battery is controlled so that the SOC of the battery is included in the first SOC region, and the temperature of the battery is equal to or higher than the predetermined temperature. A control step of controlling charging / discharging of the battery so that the SOC of the battery is included in a second SOC region higher than the first SOC region;
A required power information receiving step for receiving required power information indicating the required power;
A power acquisition step of changing a current when acquiring the power indicated by the necessary power information from the battery, which is an SOC according to the temperature of the battery by the control of the control step, according to the voltage of the battery; Including battery temperature control method. The battery temperature control method according to claim 5,
The battery temperature control method, wherein the control step makes the width of the first SOC region wider than the width of the second SOC region. The battery temperature control method according to claim 6,
In the battery temperature control method, the control step gradually lowers the first SOC region as the battery temperature decreases when the temperature of the battery detected in the temperature detection step is lower than the predetermined temperature. . The battery temperature control method according to claim 5,
In the control step, when the temperature of the battery detected in the temperature detection step is equal to or higher than a specific temperature higher than the predetermined temperature, the SOC of the battery is included in a third SOC region higher than the second SOC region. Charge / discharge of the battery is controlled so that when the temperature of the battery is equal to or higher than the predetermined temperature and lower than the specific temperature, the charge / discharge of the battery is included so that the SOC of the battery is included in the second SOC region. A battery temperature control method for controlling discharge.

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