JP6304010B2 - Secondary battery heating system - Google Patents

Description

  The present invention relates to a secondary battery temperature raising system, and more particularly, to a secondary battery temperature raising system that uses electric power supplied from an external power source for electric power for a secondary battery heater together with electric power for charging a secondary battery. .

  Japanese Patent Application Laid-Open No. H10-228688 describes changing the operating condition and operating state of a battery temperature adjusting device provided in an electric vehicle equipped with a battery according to some cases. For example, during rapid charging, the battery cooling start temperature and cooling stop temperature are set higher than those for normal charging.

  In Patent Document 2, as a method of shortening the charging time for charging devices connected to various external power sources, when the temperature of the secondary battery is lower than the first threshold temperature, the heating means of the secondary battery is energized. When the secondary battery is not charged and is equal to or higher than the second threshold temperature, the secondary battery is not energized and charged to the secondary battery. When the temperature is between the first threshold temperature and the second threshold temperature, In addition, it is described that the secondary battery is charged to full charge while controlling on / off of the heating device.

  Patent Document 3 discloses a vehicle charge / discharge control apparatus that performs timer charging in which a user designates a predetermined charging time zone and a charging completion time of a target charging amount. Here, it is stated that when it is predicted that timer charging and battery heating will be performed simultaneously, the amount of electric power for battery heating is obtained, and the charging start time is advanced by an amount corresponding thereto.

International publication 2013/141090 specification JP 2012-178899 A JP 2012-191781 A

  For example, when charging a secondary battery mounted on a vehicle from an external power source at night, the power supplied from the external power source may fluctuate. Regardless of this situation, if power is supplied uniformly for the secondary battery heater, the power supply for charging the secondary battery fluctuates, and charging of the target charge amount may not be completed by the scheduled time. .

  An object of the present invention is to provide a secondary battery temperature raising system capable of completing charging of a secondary battery in accordance with a scheduled time even when the power supplied from an external power source fluctuates.

Rechargeable battery warming system according to the present invention, a secondary battery connected in the power line to an external power source, is connected in parallel to the power line and the secondary battery, a secondary battery heater to raise the temperature of the secondary battery, A power supply amount acquisition unit that acquires a power supply amount that is a value of power flowing through the power line from the external power source toward the secondary battery, and a predetermined threshold that varies when the power supply amount acquired during charging of the secondary battery varies The secondary battery heater is operated when the supply amount is greater than or equal to the supply amount, and the operation of the secondary battery heater is stopped when the power supply amount acquired during charging of the secondary battery fluctuates and is less than a predetermined threshold supply amount. And a heater operation control unit.

  According to the secondary battery temperature raising system according to the present invention, when the power supply amount from the external power source fluctuates and becomes less than the threshold supply amount, the secondary battery heater is turned off and the power is not turned. The total amount of power supplied from is used for charging the secondary battery. When the amount of power supplied from the external power source is equal to or greater than the threshold supply amount, the secondary battery heater is turned on, and the secondary battery heater is turned on with a sufficient amount of power to raise the temperature of the secondary battery. Thereby, even when the supply power of the external power supply fluctuates, the charging of the secondary battery 46 can be completed in accordance with the scheduled time.

It is a figure which shows the structure of the external power supply charge-type hybrid vehicle by which the secondary battery temperature rising system of embodiment which concerns on this invention is mounted. It is a flowchart which shows the procedure of the secondary battery temperature rising control of embodiment which concerns on this invention. It is a flowchart which shows the procedure of the control branched as A in FIG. It is a figure which shows distribution of the electric power supply amount from an external power supply in the secondary battery temperature rising system of embodiment which concerns on this invention. FIG. 4A is a diagram showing a change over time in the amount of power supplied from the external power source, FIG. 4B is a diagram showing a change over time in the amount of charge power supplied to the secondary battery, and FIG. It is a figure which shows the time change of the heater electric energy supplied to a secondary battery heater.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, a hybrid vehicle in which a secondary battery is charged by electric power supplied from an external power source will be described as a vehicle equipped with a secondary battery temperature raising system. What is necessary is just to supply both the electric power required for charging the battery and the electric power required for heating the secondary battery heater from one external power source. For example, it may be an electric vehicle not equipped with an engine. In the following, a heater will be described as means for raising the temperature of the secondary battery. However, this is an example for explanation, and any device that can widely raise the temperature of the secondary battery may be used. In addition to the heating element, various heating devices may be used.

  The power supply amount described below, the SOC (State Of Charge) full charge value indicating the state of charge of the secondary battery, the battery temperature, etc. are examples for explanation, and may be appropriately determined according to the specifications of the secondary battery temperature raising system. It can be changed. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is an overall configuration diagram of a hybrid vehicle 10 on which a secondary battery temperature raising system 40 is mounted. The hybrid vehicle 10 is a type of vehicle that can charge a secondary battery with electric power supplied from an external power source. The hybrid vehicle 10 includes a vehicle main body 12, a charging connection terminal 14 provided in the vehicle main body 12, power lines 16, 32, 34, 36, and 38, a rotating electrical machine portion 18 indicated as MG, an engine 20, and a rotating electrical machine. A power distribution mechanism 22 that distributes power between the unit 18 and the engine 20 and a secondary battery temperature raising system 40 are configured. In FIG. 1, although not a component of the hybrid vehicle 10, an external power supply 30 for charging a secondary battery 46 mounted on the vehicle body 12 and shown as BAT, and a power supply drawn from the external power supply 30 by a power line 32. A plug 33 is shown.

  The external power supply 30 is an AC power supply or a constant voltage DC power supply. The constant voltage DC power supply is used for quick charging in which charging is performed in a short time, and is provided, for example, at a charging stand on the side of a road. The AC power source is used when a long charging time can be taken. For example, 100 V 50 c / s of general commercial AC power is obtained from an outlet or the like and used as a power source.

  The external power source 30 of the AC power source is used when the owner of the hybrid vehicle 10 charges the hybrid vehicle 10 at home during the night because the general commercial AC power has a night rate set lower than the day rate. . In this case, since the charging time can be secured for several hours or more, the charging power value per unit time can be kept low. On the other hand, general commercial AC power may vary during long-time charging. Since the embodiment of the present invention is directed to the case where the external power supply fluctuates, the following mainly describes AC charging in which the external power supply 30 is an AC power supply and charging is performed with the AC power supply. The DC charging using the voltage direct current power source and charging with the constant voltage direct current power source will be supplementarily described.

  The power line 32 is a power cable drawn from the external power supply 30 and includes a power supply plug 33 at the tip. The power supply plug 33 supplies power from the external power supply 30 to the secondary battery temperature raising system 40 by being inserted (plugged in) into the charging connection terminal 14 of the vehicle body 12 and electrically connected thereto.

  In FIG. 1, a rotating electrical machine portion 18, an engine 20, and a power distribution mechanism 22 arranged on the front side of the hybrid vehicle 10 are a drive device for the hybrid vehicle.

  The rotating electrical machine unit 18 shown as MG is configured to include two rotating electrical machines. The two rotating electric machines are both motor generators (MG) mounted on the hybrid vehicle 10, and function as a motor function when power is supplied from the secondary battery temperature raising system 40 side, and are driven by the engine 20. This is a three-phase synchronous rotating electric machine that functions as a power generation function during braking of the hybrid vehicle 10. When the two rotating electrical machines are distinguished and referred to as a first rotating electrical machine (MG1) and a second rotating electrical machine (MG2), the first rotating electrical machine (MG1) is connected to the engine 20 side of the power distribution mechanism 22, and the power distribution mechanism It is driven by the engine 20 via 22 and functions mainly as a power generation function. The second rotating electrical machine (MG2) is connected to the output shaft side of the power distribution mechanism 22, and drives the drive wheels of the hybrid vehicle 10 with the output shaft and mainly functions as a motor function.

  The engine 20 is an internal combustion engine that is one of the drive sources of the hybrid vehicle 10. The engine 20 is composed of, for example, a 6-cylinder piston / cylinder mechanism. The engine 20 supplies a mixed gas of gasoline and air as fuel into the cylinder by controlling the fuel injection valve and the intake valve, compresses the mixed gas by pushing up the piston, and uses an ignition plug for the compressed mixed gas The ignition is performed at an appropriate timing, and the piston is pushed down by the expansion of the explosion of the mixed gas. This is repeated, and the crankshaft connected to the piston is rotated to generate torque.

  The power distribution mechanism 22 provided between the rotating electrical machine unit 18 and the engine 20 generates power between the output of the engine 20, the input / output to the MG1, and the output of the MG2 according to the traveling state of the hybrid vehicle 10. This is a mechanism having a function of appropriately distributing the amount used for the motor and the portion for driving the drive wheels. As the power distribution mechanism 22, a planetary gear mechanism can be used.

  The secondary battery temperature raising system 40 includes a switching unit 42, a power conversion unit 44, a secondary battery 46, a secondary battery heater 48, power lines 34, 36 and 38, and a control device 60.

  The switching unit 42 hits the input side of the secondary battery temperature raising system 40 and is connected to the charging connection terminal 14 or integrated with the charging connection terminal 14. The switching unit 42 detects that the power supply plug 33 is inserted into the charging connection terminal 14. The detection signal is transmitted to the control device 60 as a “plug-in signal”, and the control device 60 stops driving the hybrid vehicle 10 with the drive device and receives the signal via the charging connection terminal 14. The control system and the like are switched so as to receive power supply from the power supply 30.

  The switching unit 42 is connected to a signal line provided in the power supply plug 33, and relates to power supply information including whether the external power supply 30 is a constant voltage DC power supply or an AC power supply, a supplied voltage value, a current value, and the like. Receive information. The received information is transmitted to the control device 60 via an appropriate signal line.

  The power line 34 connects between the switching unit 42 and the secondary battery 46, and the power line 36 connects between the switching unit 42 and the power conversion unit 44. One of the two power lines 34 and 36 is selected according to the power supply information received by the switching unit 42. That is, when the power source information received by the switching unit 42 is a constant voltage DC power source, a power path is set so that power is supplied from the switching unit 42 to the secondary battery 46 via the power line 34, and the received power source When the information is an AC power supply, a power path is set so that power is supplied from the switching unit 42 to the power conversion unit 44 via the power line 36.

  The secondary battery 46 is an assembled battery in which a predetermined number of battery cells obtained by combining a plurality of single cells are used to form a laminate. As the unit cell, a lithium ion battery, a nickel metal hydride battery, or the like can be used.

  The secondary battery heater 48 is a secondary battery temperature raising means that is placed in close proximity to the secondary battery 46 or in the vicinity of the secondary battery 46 and raises the temperature of the secondary battery 46 to a temperature suitable for charging and discharging. The secondary battery heater 48 includes a heating element. As the heating element, for example, a sheet heater, a winding heater, or the like can be used. The secondary battery heater 48 includes a heater switch in addition to the heating element. The heater switch is a switch element that can start or stop energization of the heating element under the control of the control device 60. As such a heater switch, an appropriate power transistor can be used. In some cases, a relay device may be used. In addition, the secondary battery 46 and the secondary battery heater 48 are accommodated in one battery pack.

  The power converter 44 is a circuit including an AC / DC converter circuit, a voltage converter, and the like. A three-phase inverter circuit is used as the AC / DC converter circuit. The power conversion unit 44 is connected to the switching unit 42 through the power line 36, connected to the secondary battery 46 and the secondary battery heater 48 through the power line 38, and connected to the rotating electrical machine unit 18 through the power line 16. The

  When the hybrid vehicle 10 is in a normal traveling state, the secondary battery 46 -the power line 38 -the power conversion unit 44 -the power line 16 -the rotating electrical machine unit 18 is connected, and the power conversion unit 44 is a drive circuit for the rotating electrical machine unit 18. Function as. When the hybrid vehicle 10 is supplied with AC power from the external power source 30, the external power source 30 -the power line 32 -the power supply plug 33 -the charging connection terminal 14 -the switching unit 42 -the power line 36 -the power conversion unit 44 -the power line 38 -2 The secondary battery 46 and the secondary battery heater 48 are connected to each other, and the power converter 44 functions as an AC / DC converter circuit that converts the AC power of the external power supply 30 into DC power suitable for the operation of the secondary battery 46.

  The secondary battery 46 and the secondary battery heater 48 are connected in parallel to the power conversion unit 44. Therefore, there is a relationship of (amount of DC power supplied from the power conversion unit 44) = {(amount of charging power to the secondary battery 46) + (amount of heater power to the secondary battery heater 48)}.

  Switching between the two connection relationships is performed under the control of the control device 60. For example, the control unit 60 acquires a signal from the switching unit 42 that detects that “the power supply plug 33 has been inserted into the charging connection terminal 14”, and the connection relationship is switched. In FIG. 1, the power lines 16, 32, 34, 36, and 38 are indicated by bold lines.

  In the DC power detection unit 50 indicated as DC / P, the external power source 30 is a constant voltage DC power source, and using this, the external power source 30 -the power line 32 -the power supply plug 33 -the charging connection terminal 14 -the switching unit 42 -the power line 34-a power sensor that detects DC power flowing through the power line 34 in the case of DC charging in which the secondary battery 46 is charged by the power path of the secondary battery 46. Data of the detected DC power DC · P is transmitted to the control device 60 via an appropriate signal line.

  The AC power detection unit 52 indicated as AC / P has an external power source 30 that is an AC power source, and uses this power source 30-power line 32-power supply plug 33-charging connection terminal 14-switching unit 42-power line 36-. In the case of AC charging in which the secondary battery 46 is charged by the power path of the power conversion unit 44, the power line 38, and the secondary battery 46, the power sensor detects AC power flowing through the power line 36. The detected AC power AC · P data is transmitted to the control device 60 via an appropriate signal line.

  The temperature detection unit 54 indicated by T is a sensor that detects the temperature T of the secondary battery 46. The data of the detected temperature T is transmitted to the control device 60 through an appropriate signal line. The SOC calculation unit 56 indicated as SOC is a calculation unit that calculates the SOC indicating the state of charge of the secondary battery 46. The calculation of the SOC can be performed based on the charging current value input to the secondary battery 46 and the discharging current value output from the secondary battery 46. The calculated SOC data is transmitted to the control device 60 through an appropriate signal line.

  The control device 60 acquires the power supply information, the DC power DC / P data, the AC power AC / P data, the secondary battery temperature T data, and the SOC data transmitted from the switching unit 42. Based on the data, the charging of the secondary battery 46 and the operation of the secondary battery heater 48 are controlled. In particular, even when the supply power of the external power supply 30 fluctuates, control is performed to complete the charging of the secondary battery 46 at the scheduled time. The control device 60 can be configured with a computer or the like suitable for in-vehicle use. In FIG. 1, the control device 60 is shown outside the vehicle main body 12, but this is for convenience of drawing, and the control device 60 is mounted on the vehicle main body 12. The control device 60 can be configured as a part of an overall control device that controls the overall operation of the hybrid vehicle 10.

  The control device 60 includes a power source information acquisition unit 62 that acquires power source information and the like from the switching unit 42, a power supply amount acquisition unit 64 that acquires DC power DC · P data or AC power AC · P data, and a secondary battery. A heater operation control unit 66 that controls the operation of the secondary battery heater 48 through on / off of a heater switch included in the heater 48 is configured.

  Such a function can be realized by executing software in the control device 60. Specifically, this is achieved by the control device 60 executing the secondary battery temperature increase control program. A part of the above functions may be realized by hardware.

  The operation of the above configuration, in particular, each function of the control device 60 will be described in more detail with reference to FIGS. 2 and 3 are flowcharts showing the procedure of secondary battery temperature increase control. Each processing procedure corresponds to each processing procedure of the secondary battery temperature increase control program. FIG. 4 is a diagram showing how the power supply amount of the external power supply 30 is distributed to the secondary battery 46 and the secondary battery heater 48.

  When the hybrid vehicle 10 is started, various elements are initialized, and the secondary battery temperature increase control program is started, it is determined whether or not the plug-in connection is established (S10). “Plug-in connection” means that the power supply plug 33 is inserted (plug-in) into the charging connection terminal 14 and electrically connected. This determination is made based on whether or not the control device 60 has acquired a signal (plug-in signal) detected from the switching unit 42 that the power supply plug 33 has been inserted into the charging connection terminal 14.

  When the determination in S10 is affirmed, power supply information is acquired (S12). This processing procedure is executed by the function of the power information acquisition unit 62 of the control device 60. Specifically, the control device 60 acquires data of power supply information transmitted from the switching unit 42.

  When the power supply information is acquired, it is determined whether AC charging is performed based on whether the type of the external power supply 30 included in the power supply information is an AC power supply or a constant voltage DC power supply (S14). If the determination in S14 is negative, DC charging is performed, and the process proceeds to A in FIG. This will be described next to the explanation of AC charging.

If the determination in S14 is affirmative, the power supply amount P of the AC power supply is acquired (S16). This processing procedure is executed by the function of the power supply amount acquisition unit 64 of the control device 60. Specifically, the control device 60 acquires the value of AC · P detected by the AC power detection unit 52. Next, it is determined whether or not the acquired power supply amount P from the external power supply 30 is equal to or greater than a predetermined threshold supply amount P ₀ (S18). The threshold supply amount P ₀ is set to the power supply amount expected when the AC power supply of the external power supply 30 does not fluctuate. An example of the threshold supply amount P ₀ is 100V9A.

When S18 in judgment is negative, since the power supply amount P from the external power source 30 AC power supply of the external power source 30 fluctuates is if below the threshold supply amount P _0, the power to the secondary battery heater 48 In order to perform the process of giving priority to the power supply to the secondary battery 46 over the supply, the process proceeds to the steps after S40. Details of this will be described later.

  When the determination in S18 is affirmative, the power supply amount P from the external power source 30 is sufficient, and the power supply to the secondary battery heater 48 can be performed. Therefore, the battery SOC is acquired (S20). Specifically, the control device 60 acquires the value of the battery SOC calculated by the SOC calculation unit 56. Then, it is determined whether or not the acquired battery SOC is less than a full charge value (S22). The rechargeable battery 46 has a chargeable capacity and a dischargeable capacity that change as the battery 46 is used. Assuming that the battery SOC after the change with time is 100% as a practical full charge value and 0% as a practical empty charge value. , S22 is a determination of whether or not the battery SOC is less than 100%.

  If the determination in S22 is negative, the battery SOC is at a fully charged value, and therefore no further charging is necessary. Even in that case, it is preferable to set the battery temperature suitable for charge / discharge which will be performed later. In order to perform the process, the process proceeds to the procedure after S50. Details of this will be described later.

If the determination in S20 is affirmative, then the battery temperature T is acquired (S24). Specifically, the control device 60 acquires the value of the battery temperature T detected by the temperature detection unit 54. Then, it is determined whether or not the acquired battery temperature T is lower than a predetermined threshold temperature T ₀ (S26). When a plurality of temperature detectors 54 are provided in the secondary battery 46, the determination of S26 is performed for the lowest battery temperature _TMIN . The threshold temperature T ₀ is set to a lower limit value of the temperature suitable for charging / discharging the secondary battery 46. As an example, the threshold temperature T ₀ is set to 0 ° C.

  When the determination in S26 is affirmative, the secondary battery heater 48 is turned on and operated in order to raise the temperature of the secondary battery 46. Specifically, the heater switch included in the secondary battery heater 48 is turned on to energize the heating element (S28). If the determination in S26 is negative, the secondary battery 46 does not need to be heated, so when the secondary battery heater 48 is already operating, the operation is stopped and the secondary battery heater 48 operates. If not, the operation stop state is continued as it is (S30). These processing procedures are executed by the function of the heater operation control unit 66 of the control device 60.

  When the process of S28 or S30 ends, AC charging is started (S32). That is, DC power controlled to a voltage suitable for charging the secondary battery 46 by the power conversion unit 44 is supplied to the secondary battery 46. AC charging indicates that the power supplied from the external power supply 30 is AC power, and the charging power supplied to the secondary battery 46 is DC power. After S32, the process returns to S16 again, and the above procedure is repeated.

Here, the procedure when the determination in S18 is negative will be described. When S18 in judgment is negative, the case below the power supply amount P threshold supply amount P ₀ from the external power source 30 AC power supply is varied in the external power supply 30. In this case, priority is given to the supply of charging power to the secondary battery 46. Therefore, the operation of the secondary battery heater 48 is stopped (S40). Since the contents of this process are the same as those described in S30, detailed description thereof is omitted.

  Then, the battery SOC is acquired (S42), and it is determined whether or not the acquired battery SOC is less than the full charge value (S44). Since the contents of this process are the same as those described in S22 and S22, detailed description thereof is omitted. When the determination in S44 is affirmative, AC charging is started (S46). Since the contents of this process are the same as those described in S32, detailed description thereof is omitted. If the determination in S44 is affirmative, charging to the secondary battery 46 is not required, so charging is stopped when charging has already started, and that state is continued when charging is stopped. . As a result, the AC charging state ends (S48). Charging of the secondary battery 46 can be stopped by stopping the operation of the power conversion unit 44 or the like. When the process of S48 ends, a series of secondary battery temperature increase control procedures ends.

Next, the procedure when the determination at S22 is negative will be described. When the determination in S22 is negative, since the battery SOC is at a fully charged value, it is not necessary to charge any more. Therefore, when AC charging is already in progress, AC charging is stopped and AC charging is stopped. If so, the state is continued (S50). Then, it is determined whether or not the battery temperature T is lower than a predetermined threshold temperature T ₀ (S52). If the determination is affirmative, the secondary battery heater 48 is turned on to raise the temperature of the secondary battery 46. If the determination is negative, the secondary battery 46 does not have to be heated, and the operation of the secondary battery heater 48 is stopped (S56). Since the contents of these processes are the same as those described in S26, S28, and S30, detailed description thereof is omitted. After the process of S54, the process returns to S52 and the above procedure is repeated. When the process of S56 ends, a series of secondary battery temperature increase control procedures ends. By these processes, the temperature of the secondary battery 46 can be set to a battery temperature suitable for the subsequent charge / discharge using the time when the battery SOC is at the full charge value.

  FIG. 3 is a flowchart illustrating a procedure when the determination in S14 is negative and DC charging is performed. During DC charging, there is no need to stop the operation of the secondary battery heater 48 because the external power source 30 is a constant voltage DC power source with little power fluctuation. Therefore, when the determination in S14 is negative, DC power supply is acquired (S60). This processing procedure is executed by the function of the power supply amount acquisition unit 64 of the control device 60. Specifically, the control device 60 acquires the value of DC · P detected by the DC power detection unit 50.

  Next, the battery SOC is acquired (S62), and it is determined whether or not the acquired battery SOC is less than the full charge value (S64). Since the contents of these processes are the same as those described in S20 and S22, detailed description thereof is omitted. If the determination in S64 is affirmative, DC charging is started (S66). That is, DC power is supplied from the switching unit 42 to the secondary battery 46 via the power line 34. After S66, the process returns to S62 again, and the above procedure is repeated. If the determination in S64 is negative, DC charging is stopped when DC charging is already in progress, and that state is continued when DC charging is stopped. As a result, the DC charging is completed (S68). When the process of S68 ends, a series of secondary battery temperature increase control procedures ends.

  According to the above configuration, even when the charging period is long as in AC charging and the power supply amount of the external power supply 30 varies during that period, the secondary battery heater is used when the power supply amount is equal to or greater than a predetermined threshold supply amount. 48 is operated, and the operation of the secondary battery heater 48 is stopped when the acquired power supply amount is less than a predetermined threshold supply amount, so that fluctuations in the charge power amount to the secondary battery 46 are suppressed to a small extent. Can do.

FIG. 4 is a diagram showing the effects. The vertical axis in FIG. 4A is the power supply amount P from the external power supply 30, the vertical axis in FIG. 4B is the charge power amount P _BAT supplied to the secondary battery 46, and FIG. A power supply amount P heater supplied to the secondary battery heater 48. Here, there is a relationship of P = P _BAT + P heater. The horizontal axis of each figure is time.

FIG. 4A shows the threshold supply amount P ₀ . The power supply amount P varies with time, and P <P ₀ between times t ₁ and t ₂ . At this time, the determination of S18 in FIG. 2 is denied, and the operation of the secondary battery heater 48 is stopped by S20, and P heater = 0 as shown in FIG. 4C. Since P ≧ P ₀ at times other than the period from time t ₁ to time t ₂ , the determination in S 18 is affirmed, and if the battery SOC is not a full charge value and the battery temperature T is less than T ₀ , two in S 28. Next battery heater 48 is turned on. At this time, from the relationship of P = P _BAT + P heater, as shown in FIG. 4B, P _BAT = P−P heater.

If the operation of the secondary battery heater 48 is not stopped during the period from time t ₁ to t ₂ , P _BAT = P−P heater even during that period, so the fluctuation range of the secondary battery charging power P _BAT is the entire period. And the fluctuation range of the power supply amount P is the same. By stopping the operation of the secondary battery heater 48 during the period from time t ₁ to t ₂ , as shown in FIG. 4B, P _BAT = P during this period. As a result, as shown in FIG. 4B, fluctuations in the secondary battery charging power P _BAT are averaged, and the fluctuation width is reduced. Thereby, even when the power supply amount of the external power supply 30 varies, the charging of the secondary battery 46 can be completed in accordance with the scheduled time.

DESCRIPTION OF SYMBOLS 10 Hybrid vehicle, 12 Vehicle main body, 14 Charging connection terminal, 16, 32, 34, 36, 38 Power line, 18 Rotating electrical machinery part, 20 Engine, 22 Power distribution mechanism,
30 External power supply, 33 Power supply plug, 40 Secondary battery temperature raising system, 42 Switching unit, 44 Power conversion unit, 46 Secondary battery (BAT), 48 Secondary battery heater (heater), 50 DC power detection unit (DC P), 52 AC power detection unit (AC / P), 54 Temperature detection unit, 56 SOC calculation unit, 60 Control device, 62 Power supply information acquisition unit, 64 Power supply amount acquisition unit, 66 Heater operation control unit

Claims (1)

A secondary battery connected to an external power source via a power line ;
Is connected in parallel to said secondary battery and said power line, and a secondary battery heater to raise the temperature of the secondary battery,
A power supply amount obtaining unit for obtaining the power supply amount is a power value flowing through the power line towards the secondary battery from the external power source,
Wherein said power supply amount obtained during charging of the secondary battery to operate the secondary battery heater when the threshold value or more supply amount previously determined fluctuates, obtained during charging of the secondary battery a heater operation control unit for stopping the operation of the secondary battery heater when less than the threshold amount of supply power amount is determined in advance varied,
A secondary battery temperature raising system comprising:

Images