JP2010205478A - Device for adjusting battery temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for adjusting battery temperature capable of preventing exhaustion of a battery for an auxiliary machine. <P>SOLUTION: The device for adjusting battery temperature is used for adjusting the temperature of a battery mounted on a vehicle, for example. The device for adjusting the battery temperature includes first and second power storage devices, a heating device, and a control device. The first power storage device is a battery for driving, for example, and supplies electric power to a load such as a motor generator. The heating device is a temperature keeping heater, for example, and heats the first power storage device. The second power storage device is a battery for auxiliary machine, for example, and supplies electric power to the heating device, and the control device is a driving circuit, for example, and heats the first power storage device according to the charging amount of the second power storage device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to the technical field of adjusting battery temperature.

  This type of technology is described in Patent Documents 1 and 2. Japanese Patent Application Laid-Open No. 2004-228561 describes a technique for maintaining a running battery in a warm-up state by controlling energization of a heater during a warm-up time until the warm-up timer expires in a state where the ignition switch of the vehicle is turned off. Has been. Patent Document 2 also describes a technique related to the present invention.

JP 2005-295668 A Japanese Patent Laid-Open No. 2003-223938

  However, in the technique described in Patent Document 1, when the energization of the heater is controlled by the auxiliary battery regardless of the external power, if the charge amount of the auxiliary battery is insufficient, the battery of the auxiliary battery may increase. There is.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a battery temperature adjusting device capable of preventing the auxiliary battery from running out of battery.

  In one aspect of the present invention, a battery temperature adjustment device for adjusting the temperature of a battery mounted on a vehicle, the first power storage device supplying power to a load, and heating the first power storage device A second power storage device that supplies power to the heating device, and a control device that sets a time for heating the first power storage device according to a charge amount of the second power storage device And having.

  The battery temperature adjusting device described above is for adjusting the temperature of a battery such as a battery mounted on a vehicle. The battery temperature adjustment device includes first and second power storage devices, a heating device, and a control device. The first power storage device is, for example, a driving battery, and supplies power to a load such as a motor generator. The heating device is, for example, a heat retaining heater, and heats the first power storage device. The second power storage device is, for example, an auxiliary battery, and supplies power to the heating device. The control device is, for example, a drive circuit, and heats the first power storage device according to the charge amount of the second power storage device. By doing so, it is possible to prevent the battery of the second power storage device from running out.

  In another aspect of the battery temperature adjusting device, the control unit increases the upper limit amount of charging of the second power storage device when there is a possibility of keeping the first power storage device warm. In this way, since the heat retention time of the first power storage device by the heating device can be increased, the first power storage device can be sufficiently warmed and kept long in a battery efficient state. It becomes possible.

  A battery temperature adjustment device for adjusting the temperature of a battery mounted on a vehicle, the first power storage device supplying power to a load, the heating device for heating the first power storage device, A second power storage device that supplies power to the heating device; and a control device that sets a time for heating the first power storage device in accordance with a charge amount of the second power storage device. By doing so, it is possible to prevent the battery of the second power storage device from running out.

It is a figure which shows schematic structure of the vehicle to which the battery temperature control apparatus of this invention is applied. It is a flowchart which shows the adjustment process of the battery temperature which concerns on 1st Embodiment. It is a flowchart which shows the adjustment process of the battery temperature which concerns on 2nd Embodiment. It is a flowchart which shows the adjustment process of the battery temperature which concerns on 3rd Embodiment.

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

[Device configuration]
A vehicle to which the battery temperature adjusting device of the present invention is applied will be described with reference to FIG.

  FIG. 1 is a diagram illustrating a schematic configuration of a vehicle 10 according to each embodiment. The vehicle 10 is, for example, a hybrid (HV) vehicle or an electric (EV) vehicle, and includes a motor generator MG, an inverter 11, a battery pack 12, a DCDC converter 13, a drive circuit 14, an auxiliary battery 15, Is provided.

  The battery pack 12 includes a vehicle driving secondary battery (driving battery) 22, a relay circuit 21 that switches on / off power output from the driving battery 22, and a heating battery 22. A warming heater 23.

  The motor generator MG is configured as a synchronous motor generator, for example, and includes a rotor having a plurality of permanent magnets on the outer peripheral surface and a stator around which a three-phase coil that forms a rotating magnetic field is wound. Motor generator MG functions as a generator for charging auxiliary battery 15 or an electric motor as a power source of vehicle 10. Needless to say, the number of motor generators MG is not limited to one, and a plurality of motor generators MG may be provided.

  Inverter 11 is a DC / AC converter that controls input / output of electric power between battery pack 12 and motor generator MG. For example, when the motor generator MG functions as an electric motor, the inverter 11 converts DC power extracted from the driving battery 22 of the battery pack 12 into AC power and supplies the AC power to the motor generator MG. On the other hand, when motor generator MG functions as a generator, inverter 11 converts AC power generated by motor generator MG into DC power and supplies it to auxiliary battery 15. The DCDC converter 13 converts the power supplied from the inverter 11 to a voltage and charges the auxiliary battery 15.

  The drive circuit 14 is an ECU (Engine Control Unit), for example, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (not shown). The drive circuit 14 adjusts the temperature of the drive battery 22 by controlling the electric power supplied from the auxiliary battery 15 to the heat retaining heater 23. Hereinafter, the battery temperature adjustment process according to each embodiment will be described.

[First Embodiment]
The battery temperature adjustment process according to the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing battery temperature adjustment processing according to the first embodiment.

  In the battery temperature adjustment process according to the first embodiment, the drive circuit 14 determines that the battery temperature of the drive battery 22 rises above the determination value and the ignition switch is turned off under conditions where the outside air temperature is relatively low. When this is done, power is supplied from the auxiliary battery 15 to the heat retaining heater 23.

  First, in step S101, the drive circuit 14 determines whether or not the outside air temperature is lower than a predetermined temperature. Specifically, for example, the drive circuit 14 detects the outside air temperature based on a detection signal from an outside air temperature sensor (not shown), and determines whether or not the detected outside air temperature is lower than a predetermined temperature. . Here, the predetermined temperature is a conforming value obtained in advance by experiments or the like, and is stored in a ROM or the like. When it is determined that the outside air temperature is lower than the predetermined temperature (step S101: Yes), the drive circuit 14 proceeds to the process of step S102 and determines that the outside air temperature is equal to or higher than the predetermined temperature. (Step S101: No), this adjustment process is terminated.

  In step S102, the drive circuit 14 determines whether or not the ignition switch is turned off. That is, the drive circuit 14 determines whether or not the vehicle is in a storage state but not in a traveling state. If the drive circuit 14 determines that the ignition switch is on (step S102: Yes), the drive circuit 14 proceeds to the process of step S103, and if it determines that the ignition switch is off (step S102). : No), this adjustment process is terminated.

  In step S <b> 103, the drive circuit 14 determines whether or not the temperature of the drive battery 22 is higher than the determination value based on a detection signal from a temperature sensor or the like attached to the drive battery 22. If the drive circuit 14 determines that the temperature of the drive battery 22 is higher than the determination value (step S103: Yes), the process proceeds to step S104, where the temperature of the drive battery 22 is equal to or lower than the determination value. If it is determined that it is (step S103: No), this adjustment process is terminated. Here, the determination value is a suitable value obtained in advance by experiments or the like, and is stored in a ROM or the like.

  In step S <b> 104, the drive circuit 14 keeps the driving battery 22 warm by supplying the power from the auxiliary battery 15 to the warming heater 23. Thereafter, the drive circuit 14 proceeds to the process of step S105.

  In step S <b> 105, the drive circuit 14 determines whether or not a predetermined time has elapsed since the power from the auxiliary battery 15 was supplied to the heat retaining heater 23. If the drive circuit 14 determines that the predetermined time has not elapsed since the power from the auxiliary battery 15 was supplied to the heat retaining heater 23 (step S105: No), the drive circuit 14 returns to the process of step S104 and returns to the predetermined time. If it is determined that the time has elapsed (step S105: Yes), the process proceeds to step S106. Here, the predetermined time is an adapted value obtained in advance by experiments or the like, and is stored in a ROM or the like.

  In step S106, the drive circuit 14 stops the power supply from the auxiliary battery 15 to the heat retaining heater 23, and thereafter ends the adjustment process.

  As described above, in the battery temperature adjustment process according to the first embodiment, the drive circuit 14 causes the battery temperature of the drive battery 22 to rise above the determination value in a situation where the outside air temperature is relatively low, When the ignition switch is turned off, power is supplied from the auxiliary battery 15 to the heat retaining heater 23. By doing in this way, compared with the case where the drive battery in a relatively low temperature state is heated without being warmed up, the required power is small, and the power usage efficiency of the auxiliary battery 15 is reduced. Can be improved.

  In addition, when power from the driving battery 22 is supplied to the heat retaining heater 23, a DCDC converter for converting the power of the driving battery 22 to the power of the heat retaining heater 23 is required, and power loss occurs. . On the other hand, in the battery temperature control apparatus of the present invention, by providing the auxiliary battery 15, the DCDC converter is not required, and the power use efficiency can be improved and the cost can be reduced.

  In addition, when power from the driving battery 22 is supplied to the heat retaining heater 23, the driving battery 22 cannot be heated until the ignition switch is turned on for safety reasons. On the other hand, in the battery temperature control apparatus of the present invention, the independent auxiliary battery 15 different from the driving battery 22 is used, so that the driving battery 22 can be heated even when the ignition switch is turned off. .

  Furthermore, as compared with the case where electric power from an external power source is supplied to the heat retaining heater 23, the battery temperature adjusting device of the present invention can heat the driving battery 22 regardless of the location.

[Second Embodiment]
Next, the battery temperature adjustment process according to the second embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing a battery temperature adjustment process according to the second embodiment.

  In the battery temperature adjustment process according to the second embodiment, the drive circuit 14 heats the drive battery 22 according to the charge amount of the auxiliary battery 15 in addition to the battery temperature adjustment process according to the first embodiment. Is set.

  In step S <b> 201, the drive circuit 14 determines whether or not to supply power to the warming heater 23. In the example of the first embodiment, the drive circuit 14 is configured such that the battery temperature of the drive battery 22 rises above the determination value and the ignition switch is turned off under a condition where the outside air temperature is relatively low. Sometimes, it is determined to supply power to the heat retaining heater 23. If the drive circuit 14 determines not to supply power to the heat retaining heater 23 (step S201: No), the drive circuit 14 ends this adjustment process and determines to supply power to the heat retaining heater 23. If so (step S201: Yes), the process proceeds to step S202.

  In step S202, the drive circuit 14 measures the voltage of the auxiliary battery 15. In the subsequent step S203, the drive circuit 14 estimates the charge amount of the auxiliary battery 15 based on the measured voltage of the auxiliary battery 15, and supplies power to the heat insulation heater 23 according to the charge amount. Is calculated, that is, the time for heating the driving battery 22 is calculated. In step S <b> 204, the drive circuit 14 heats the drive battery 22 by supplying power from the auxiliary battery 15 to the heat retaining heater 23.

  In step S205, the drive circuit 14 determines whether or not the voltage of the auxiliary battery 15 is smaller than a predetermined value. When the drive circuit 14 determines that the voltage of the auxiliary battery 15 is not smaller than the predetermined value, that is, the voltage of the auxiliary battery 15 is equal to or higher than the predetermined value (step S205: No), step S206 is performed. Proceed to the process. On the other hand, when the drive circuit 14 determines that the voltage of the auxiliary battery 15 is smaller than the predetermined value (step S205: Yes), the adjustment process is terminated.

  In step S <b> 206, the drive circuit 14 determines whether or not the power supply time has elapsed after supplying power to the heat retaining heater 23. When the drive circuit 14 determines that the power supply time has not elapsed since the power was supplied to the heat retaining heater 23 (step S206: No), the drive circuit 14 returns to the process of step S205. On the other hand, if the drive circuit 14 determines that the power supply time has elapsed after supplying power to the heat retaining heater 23 (step S206: Yes), the process proceeds to step S207.

  In step S207, the drive circuit 14 stops the power supply from the auxiliary battery 15 to the heat retaining heater 23, and thereafter ends the adjustment process.

  As described above, in the battery temperature adjustment process according to the second embodiment, the drive circuit 14 can supply power according to the charge amount of the auxiliary battery 15, that is, the drive battery 22. The heating time is calculated, and power from the auxiliary battery 15 is supplied to the heat retaining heater 23 for the power supply time. By doing so, in addition to the effects described in the first embodiment, it is possible to prevent the auxiliary battery 15 from running out of battery. Further, when the voltage of the auxiliary battery is smaller than a predetermined value, the drive circuit 14 stops the power supply to the heat retaining heater 23. Thereby, the lower limit crack of the auxiliary battery 15 can be prevented.

[Third Embodiment]
Next, the battery temperature adjustment process according to the third embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing battery temperature adjustment processing according to the third embodiment.

  In the battery temperature adjustment process according to the third embodiment, the drive circuit 14 includes the drive battery 22 such that the outside air temperature is relatively low in addition to the battery temperature adjustment process according to the first or second embodiment. When there is a possibility of keeping the temperature, the upper limit amount of charging of the auxiliary battery 15 during traveling of the vehicle is increased as compared with the case where it is not.

  In step S301, the drive circuit 14 determines whether or not the outside air temperature is lower than a predetermined temperature. Specifically, the drive circuit 14 detects an outside air temperature based on, for example, a detection signal from an outside air temperature sensor, and determines whether or not the detected outside air temperature is lower than a predetermined temperature. Here, the predetermined temperature is a conforming value obtained in advance by experiments or the like, and is stored in a ROM or the like. When it is determined that the outside air temperature is lower than the predetermined temperature (step S301: Yes), the drive circuit 14 proceeds to the process of step S302 and determines that the outside air temperature is equal to or higher than the predetermined temperature. (Step S301: No), this adjustment process is terminated.

  In step S302, the drive circuit 14 determines whether or not the auxiliary battery 15 can be charged. For example, when the vehicle is a hybrid vehicle, the drive circuit 14 moves to the auxiliary battery 15 when the vehicle is running on an engine and the motor generator MG functions as a generator. It is determined that charging is possible. When the drive circuit 14 determines that the auxiliary battery 15 cannot be charged (step S302: No), the driving circuit 14 ends the adjustment process and determines that the auxiliary battery 15 can be charged. (Step S302: Yes), the process proceeds to Step S303.

  In step S <b> 303, the drive circuit 14 increases the upper limit amount (charging upper limit amount) of charging of the auxiliary battery 15, and then starts charging the auxiliary battery 15. For example, drive circuit 14 starts supplying electric power generated by motor generator MG to auxiliary battery 15. Thereafter, the drive circuit 14 proceeds to the process of step S304.

  In step S304, the drive circuit 14 determines whether or not the charge amount of the auxiliary battery 15 is equal to or greater than the charge upper limit amount. If the drive circuit 14 determines that the charge amount of the auxiliary battery 15 is smaller than the charge upper limit amount (step S304: No), the process of step S304 is repeated. On the other hand, if the drive circuit 14 determines that the charge amount of the auxiliary battery 15 is equal to or greater than the upper limit charge amount (step S304: Yes), the drive circuit 14 proceeds to the process of step S305 and charges the auxiliary battery 15 To end the adjustment process.

  As described above, in the battery temperature adjustment process according to the third embodiment, when there is a possibility that the driving circuit 22 keeps the temperature of the driving battery 22, the driving circuit 14 compensates during driving of the vehicle more than otherwise. It is assumed that the charging upper limit amount of the machine battery 15 is increased. By doing in this way, since the heat retention time of the drive battery 22 by the heat retention heater 23 can be taken long, the drive battery 22 can be sufficiently kept warm and kept long in a battery efficient state. It becomes possible.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and implementation involving such a change. The form is also included in the technical scope of the present invention.

11 Inverter 12 Battery pack 13 DCDC converter 14 Drive circuit MG Motor generator

Claims (2)

A battery temperature adjusting device for adjusting the temperature of a battery mounted on a vehicle,
A first power storage device for supplying power to a load;
A heating device for heating the first power storage device;
A second power storage device for supplying power to the heating device;
And a control device for setting a time for heating the first power storage device in accordance with a charge amount of the second power storage device.   2. The battery temperature adjustment device according to claim 1, wherein the control device increases an upper limit amount of charging of the second power storage device when there is a possibility of keeping the temperature of the first power storage device.

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