JP6870589B2 - Power supply - Google Patents

Description

The present invention relates to a power supply device, and more particularly to a power supply device including a plurality of power storage devices.

Conventionally, as this type of power supply device, when the battery is charged by connecting to a commercial power source, when the battery temperature is equal to or lower than a predetermined temperature, ripple temperature rise control is performed to raise the temperature of the battery, and then the power source is used. Those that charge using electric power have been proposed (see, for example, Patent Document 1). Here, the ripple temperature rise control is a control in which charging / discharging is repeated in a short time by a predetermined charging / discharging current between the battery and the smoothing capacitor.

Japanese Unexamined Patent Publication No. 2011-83124

When charging a plurality of power storage devices having a large capacity in a cold state in a fixed time, when the power storage devices are sequentially charged, the temperature of the power storage device charged first decreases, and the maximum allowable power that can be output from the power storage device decreases. Occurs. On the other hand, when a plurality of power storage devices are charged at the same time, the temperature rise of the power storage devices becomes slow, the charging efficiency also decreases, and sufficient charging may not be performed.

The main object of the power supply device of the present invention is to charge a plurality of power storage devices so that the maximum allowable power that can be output from the plurality of power storage devices becomes large.

The power supply device of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The power supply device of the present invention
A power supply device mounted on an electric vehicle having N power storage devices and a drive device that outputs power by electric power from at least one of the N power storage devices.
A charging switching device that switches and charges M charging methods using M combinations of at least one of the N power storage devices using electric power from an external charger.
A charge control device that controls the charge switching device and
With
The charge control device is
(1) Regarding the M charging methods, the temperatures of the N power storage devices when charged with a predetermined current for a predetermined time are obtained as N estimated temperatures based on the characteristics of each power storage device, and the N power storage devices are charged. By obtaining the maximum allowable power that can be output from the N power storage devices at the N estimated temperatures based on the estimated temperature and the characteristics of each power storage device, the allowable maximum power of M pieces is obtained.
(2) Control so as to charge by a charging method that can obtain the largest allowable maximum power among the M allowable maximum powers.
It is characterized by that.

In the power supply device of the present invention, with respect to the M charging method of charging using the combination of M of N storage devices, the temperature of the N power storage devices when charged with a predetermined current for a predetermined time is stored in each storage device. Obtain as N estimated temperatures based on the characteristics of the device, and obtain the maximum allowable power that can be output from N power storage devices at N estimated temperatures based on the characteristics of N estimated temperatures and each power storage device. By doing so, the maximum allowable power of M pieces is obtained. Then, it is controlled to charge by a charging method that can obtain the largest allowable maximum power among the M allowable maximum powers. As a result, the N power storage devices can be charged so that the maximum allowable power that can be output from the N power storage devices becomes large.

When the power supply device includes two power storage devices, a first power storage device and a second power storage device, it is as follows. The M charging methods include a first charging method for charging only the first power storage device, a second charging method for charging only the second power storage device, and a second charging method for charging both the first power storage device and the second power storage device. There are three charging methods: three charging methods. The M allowable maximum powers are the first allowable maximum power by the first charging method, the second allowable maximum power by the second charging method, and the third allowable maximum power by the third charging method. .. The first allowable maximum power is obtained by obtaining the temperature of the first power storage device when charging with a predetermined current for a predetermined time by the first charging method as the first estimated temperature based on the characteristics of the first power storage device, and the first estimated temperature. Based on the characteristics of the first power storage device, the maximum allowable power that can be output from the first power storage device at the first estimated temperature and the temperature at the start of charging (estimated temperature of the second power storage device) It is calculated as the sum of the maximum allowable power that can be output from the device. The second allowable maximum power is obtained by obtaining the temperature of the second power storage device when charging with a predetermined current for a predetermined time by the second charging method as the second estimated temperature based on the characteristics of the second power storage device, and using the second estimated temperature as the second estimated temperature. Based on the characteristics of the second power storage device, the maximum allowable power that can be output from the second power storage device at the second estimated temperature and the temperature at the start of charging (estimated temperature of the first power storage device) are from the first power storage device. It is calculated as the sum of the maximum allowable power that can be output. The third allowable maximum power is based on the characteristics of the first power storage device and the characteristics of the second power storage device when the temperatures of the first power storage device and the second power storage device are charged with a predetermined current for a predetermined time by the third charging method. Obtained as the 3rd estimated temperature and the 4th estimated temperature, and the maximum allowable power that can be output from the 1st power storage device and the 4th estimation at the 3rd estimated temperature obtained based on the characteristics of the 3rd estimated temperature and the 1st power storage device. It is obtained as the sum of the temperature and the maximum allowable power that can be output from the second power storage device at the fourth estimated temperature obtained based on the characteristics of the second power storage device. Then, charging is performed by a charging method that obtains the largest allowable maximum power among the first allowable maximum power, the second allowable maximum power, and the third allowable maximum power. As a result, the two power storage devices can be charged so that the maximum allowable power that can be output from the two power storage devices becomes large.

When the power supply device includes three power storage devices, that is, a first power storage device, a second power storage device, and a third power storage device, the output is as follows. The M charging methods include a first charging method for charging only the first power storage device, a second charging method for charging only the second power storage device, a third charging method for charging only the third power storage device, and a third charging method. A fourth charging method that charges only the first power storage device and the second power storage device at the same time, a fifth charging method that charges only the second power storage device and the third power storage device at the same time, and only the first power storage device and the third power storage device. There are seven charging methods: a sixth charging method for charging at the same time, and a seventh charging method for simultaneously charging the first power storage device, the second power storage device, and the third power storage device. The M allowable maximum powers are the first allowable maximum power by the first charging method, the second allowable maximum power by the second charging method, the third allowable maximum power by the third charging method, and the fourth allowable maximum power by the fourth charging method. There are seven permissible maximum powers: the 4 permissible maximum power, the 5th permissible maximum power by the 5th charging method, the 6th permissible maximum power by the 6th charging method, and the 7th permissible maximum power by the 7th charging method. The seven allowable maximum powers are calculated in the same manner as when the power supply device includes two power storage devices, a first power storage device and a second power storage device. Then, charging is performed by a charging method that obtains the largest permissible maximum power among the seven permissible maximum powers. As a result, the three power storage devices can be charged so that the maximum allowable power that can be output from the three power storage devices becomes large. The same applies when the power supply device includes four or more power storage devices.

It is a block diagram which shows the outline of the structure of the power supply device 20 of the Example of this invention. It is a flowchart which shows an example of the charge control routine executed by an electronic control unit 60. It is explanatory drawing which shows an example of the temperature rise value calculation map A1. It is explanatory drawing which shows an example of the output limitation map A2. It is explanatory drawing which shows an example of the output limitation map B2. It is explanatory drawing which shows an example of the temperature rise value calculation map B1.

Next, a mode for carrying out the present invention will be described with reference to examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of the power supply device 20 according to the embodiment of the present invention. The power supply device 20 of the embodiment is configured as a power supply device mounted on an electric vehicle that supplies electric power to a driving device 10 for traveling, and as shown in the figure, a first battery 22, a second battery 32, and the like. A converter 40 and an electronic control unit 60 are provided, and power is supplied to the drive device 10 or connected to an external charger 18 connected to an external power source to charge the first batteries 22 and 32. The drive device 10 corresponds to a motor, an inverter for driving the motor, and the like.

The first battery 22 is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery, and is connected to a power line 24 (24a, 24b). The second battery 32 is configured as a battery having characteristics different from those of the first battery 22, and is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery. The second battery 32 is connected to the power lines 34 (34a, 34b).

The converter 40 includes a power line 24 (24a, 24b) to which the first battery 22 is connected, a power line 34 (34a, 34b) to which the second battery 32 is connected, and a power line 14 (14a) to which the drive device 10 is connected. , 1b), and is configured to be able to supply the power of the power lines 24, 34 (first batteries 22, 32) to the power line 14 (driving device 10) with a voltage boost. ing. The converter 40 includes switching elements S1 to S4, diodes D1 to D4, and reactors L1 and L2. The switching elements S1 to S4 are configured as, for example, an insulated gate bipolar transistor (IGBT), and are located between the positive electrode bus 14a of the power line 14 and the negative electrode bus 14b, 24b of the power lines 14, 24. They are connected in series in order. The diodes D1 to D4 are connected to each of the switching elements S1 to S4 in parallel in the opposite direction. The first reactor L1 is connected to a connection point C1 between the switching element S2 and the switching element S3 and a positive electrode bus 24a of the power line 24. The second reactor L2 is connected to the connection point C2 between the switching element S1 and the switching element S2 and the positive electrode bus 34a of the power line 34. Further, the connection point C3 between the switching element S3 and the switching element S4 is connected to the negative electrode bus 34b of the power line 34. A smoothing capacitor 16 is connected to the power line 14, a smoothing capacitor 26 is connected to the power line 24, and a smoothing capacitor 36 is connected to the power line 34. ing.

The electronic control unit 60 is configured as a microprocessor centered on a CPU, and in addition to the CPU, a ROM for storing a processing program, a RAM for temporarily storing data, a timer for measuring time, and a timer for setting values. It is equipped with a matching output unit and an input / output port that outputs a predetermined output when the timed values match.

Signals from various sensors are input to the electronic control unit 60 via input ports. The signal input to the electronic control unit 60 includes, for example, the voltage VH of the capacitor 16 (power line 14) from the voltage sensor 16a attached between the terminals of the capacitor 16 and the voltage attached between the terminals of the capacitor 26. The voltage VL1 of the capacitor 26 (power line 24) from the sensor 26a can be mentioned. Further, the current IL1 from the current sensor 41 attached between the connection point between the switching element S2 and the switching element S3 and the reactor L1, or between the connection point between the switching element S1 and the switching element S2 and the reactor L2. The current IL2 from the attached current sensor 42 and the voltage VL2 of the capacitor 36 (power line 14) from the voltage sensor 36a attached between the terminals of the capacitor 36 can also be mentioned. Further, it is attached between the terminals of the power supply voltage VB1 from the voltage sensor attached between the terminals of the first battery 22, the battery current IB1 from the current sensor attached to the positive terminal of the first battery 22, and the terminals of the second battery 32. The power supply voltage VB2 from the voltage sensor and the battery current IB2 from the current sensor attached to the positive terminal of the second battery 32 can also be mentioned. In addition, the first battery temperature Ta from the temperature sensor 22a attached to the first battery 22 and the second battery temperature Tb from the temperature sensor 32a attached to the second battery 32 can also be mentioned. Further, when the external charger 18 is connected, the electronic control unit 60 is connected to the external charger 18 by a communication line and communicates with the external charger 18.

From the electronic control unit 60, control signals S1a to S4a of the switching elements S1 to S4 are output via the output port. Further, the electronic control unit 60 calculates the storage ratios SOC1 and SOC2 of the first batteries 22 and 32 based on the battery current Ib1 and the battery current Ib2 from the current sensor. The storage ratio SOC is the ratio of the capacity of electric power that can be discharged from the first batteries 22 and 32 to the total capacity of the first batteries 22 and 32.

In the power supply device 20 of the embodiment configured in this way, the converter 40 has switching elements S1 and S2 as upper arms between the power line 24 and the power line 14, that is, with respect to the first battery 22. It functions as a converter (hereinafter, referred to as “first power supply converter”) having switching elements S3 and S4 as lower arms. In this case, assuming that the lower arms (switching elements S3 and S4) are on and the upper arms (switching elements S1 and S2) are off, the first battery 22, the positive electrode bus 24a of the power line 24, the reactor L1, and the switching element A circuit is formed in which current flows in the order of S3, switching element S4, negative electrode bus 24b of the power line 24, and first battery 22. At this time, energy is stored in the reactor L1. Then, when the lower arms (switching elements S3 and S4) are turned off and the upper arms (switching elements S1 and S2) are turned on from this state, the first battery 22, the positive electrode bus 24a of the power line 24, and the reactor The circuit is switched to a circuit in which current flows in the order of L1, diode D2, diode D1, positive electrode bus 14a of power line 14, drive device 10, negative electrode bus 14b of power line 14, negative electrode bus 24b of power line 24, and first battery 22. At this time, the energy of the reactor L1 is supplied to the power line 14 (driving device 10) together with the energy of the power line 24 (first battery 22). Therefore, by alternately forming these states, the electric power of the electric power line 24 can be supplied to the electric power line 14 with the voltage boosting.

Further, the converter 40 has switching elements S1 and S4 as an upper arm and switching elements S2 and S3 as a lower arm between the power line 34 and the power line 14, that is, with respect to the second battery 32. It functions as a converter (hereinafter referred to as "converter for second power supply"). In this case, assuming that the lower arms (switching elements S2 and S3) are on and the upper arms (switching elements S1 and S4) are off, the second battery 32, the positive electrode bus 34a of the power line 34, the reactor L2, and the switching element A circuit is formed in which current flows in the order of S2, switching element S3, negative electrode bus 34b of the power line 34, and second battery 32. At this time, energy is stored in the reactor L2. Then, when the lower arms (switching elements S2 and S3) are turned off and the upper arms (switching elements S1 and S4) are turned on from this state, the second battery 32, the positive electrode bus 34a of the power line 34, and the reactor The circuit is switched to a circuit in which current flows in the order of L2, diode D1, positive electrode bus 14a of power line 14, drive device 10, negative electrode bus 14b of power line 14, diode D4, negative electrode bus 34b of power line 34, and second battery 32. At this time, the energy of the reactor L2 is supplied to the power line 14 (driving device 10) together with the energy of the power line 34 (second battery 32). Therefore, by alternately forming these states, the electric power of the electric power line 34 can be supplied to the electric power line 14 with the voltage boosting.

Further, in the power supply device 20 of the embodiment, when the switching elements S1 and S2 are on and the switching elements S3 and S4 are off, the current from the external charger 18 is the switching element S1, the switching element S2, the reactor L1, and the first. 1 The battery 22 flows through the circuit of the external charger 18 to charge the first battery 22. When the switching elements S1 and S4 are on and the switching elements S2 and S3 are off, the current from the external charger 18 is the circuit of the switching element S1, reactor L2, the second battery 32, the switching element S4, and the external charger 18. And charges the second battery 32. When the switching elements S1, S2 and S4 are on and the switching element S3 is off, the current from the external charger 18 is the current of the switching element S1, the switching element S2, the reactor L1, the first battery 22, and the external charger 18. It flows through the circuit and the circuit of the switching element S1, the reactor L2, the second battery 32, the switching element S4, and the external charger 18, and charges the first battery 22 and the second battery 32 at the same time. The current flowing through the first battery 22 and the second battery 32 at this time can be controlled by switching the switching elements S1 and S2.

Next, the operation when the external charger 18 is connected to the power supply device 20 to charge the first batteries 22 and 32 will be described. FIG. 2 is a flowchart showing an example of a charge control routine executed by the electronic control unit 60. This routine is executed when the external charger 18 is connected and the charging time Tchg, the target running time, or the like is set by the user from a setting screen (not shown).

When the charge control routine is executed, the electronic control unit 60 first inputs the first battery temperature Ta and the second battery temperature Tb from the temperature sensors 22a and 32a (step S100). Subsequently, the maximum allowable power that can be discharged from the first battery 22 and the second battery 32 when the first battery 22 and the second battery 32 are charged with the maximum current Imax for the charging time Tchg by the following three charging methods. The output limits Wout1, Wout2, and Wout3 are calculated as (steps S110 to S150, steps S210 to S250, steps S310 to S350). The first charging method is a method of charging only the first battery 22 with a maximum current Imax for a charging time of Tchg. The second charging method is a method of charging only the second battery 32 with the maximum current Imax for the charging time Tchg. The third charging method is a method of charging the first battery 22 and the second battery 32 with a current that is half of the maximum current Imax for the charging time Tchg.

In the calculation of the output limit Wout1, first, the temperature rise value ΔTa when the first battery 22 is charged with the maximum current Imax for the charging time Tchg is obtained by using the temperature rise value calculation map A1 (step S110). The temperature rise value calculation map A1 can be created by obtaining the relationship between the charging time Tchg of the first battery 22, the charging current I, and the temperature rise value ΔTa in advance by an experiment or the like. FIG. 3 shows an example of the temperature rise value calculation map A1. Therefore, the temperature rise value ΔTa can be obtained by deriving the corresponding temperature rise value ΔTa from the map A1 when the charging time Tchg and the maximum current Imax are given. Subsequently, the obtained temperature rise value ΔTa is added to the input first battery temperature Ta to calculate the estimated temperature Taest1 of the first battery 22 when the first battery 22 is charged with the maximum current Imax for the charging time Tchg (. Step S120). Next, the estimated temperature Taest1 is applied to the output limiting map A2 to obtain the output limiting Wout1a of the first battery 22 when the first battery 22 is charged with the maximum current Imax for the charging time Tchg (step S130). The output limiting map A2 can be created by obtaining the relationship between the estimated temperature Taest of the first battery 22 and the output limiting Wout1a in advance by an experiment or the like. An example of the output limiting map A2 is shown in FIG. Next, the input second battery temperature Tb (estimated temperature after charging) is applied to the output limiting map B2 to obtain the output limiting Wout1b of the second battery 32 (step S140). The output limiting map B2 can be created by obtaining the relationship between the temperature Tb of the second battery 32 and the output limiting Wout1b in advance by an experiment or the like. An example of the output limiting map B2 is shown in FIG. The input second battery temperature Tb is used as the estimated temperature after charging because the second battery 32 is not charged. Then, the output limit Wout1 is calculated as the sum of the output limit Wout1a and the output limit Wout1b (step S150).

In the calculation of the output limit Wout2, first, the temperature rise value ΔTb when the second battery 32 is charged with the maximum current Imax for the charging time Tchg is obtained by using the temperature rise value calculation map B1 (step S210). The temperature rise value calculation map B1 can be created by obtaining the relationship between the charging time Tchg of the second battery 32, the charging current I, and the temperature rise value ΔTb in advance by an experiment or the like. FIG. 6 shows an example of the temperature rise value calculation map B1. Therefore, the temperature rise value ΔTb can be obtained by deriving the corresponding temperature rise value ΔTb from the map B1 when the charging time Tchg and the maximum current Imax are given. Subsequently, the obtained temperature rise value ΔTb is added to the input second battery temperature Tb to calculate the estimated temperature Tbest1 of the second battery 32 when the second battery 32 is charged with the maximum current Imax for the charging time Tchg ( Step S220). Next, the estimated temperature Tbest1 is applied to the output limiting map B2 illustrated in FIG. 5 to obtain the output limiting Wout2b of the second battery 32 when the second battery 32 is charged with the maximum current Imax for the charging time Tchg (step). S230). The input first battery temperature Ta (estimated temperature after charging) is applied to the output limiting map A2 illustrated in FIG. 4 to obtain the output limiting Wout2a of the first battery 22 (step S240). Here, the input first battery temperature Ta is used as the estimated temperature after charging because the first battery 22 is not charged. Then, the output limit Wout2 is calculated as the sum of the output limit Wout2a and the output limit Wout2b (step S250).

In the calculation of the output limit Wout3, first, in the calculation of the output limit Wout1, as in the calculation of the estimated temperature Taest1 of the first battery 22, the charge time Tchg and the current half of the maximum current Imax (Imax) are displayed on the temperature rise value calculation map A1. By applying / 2), the estimated temperature Taest2 of the first battery 22 when the first battery 22 is charged with the current (Imax / 2) for the charging time Tchg is calculated (step S310). Subsequently, in the calculation of the output limit Wout2, the charging time Tchg and the current (Imax / 2), which is half of the maximum current Imax, are applied to the temperature rise value calculation map B1 in the same manner as in the calculation of the estimated temperature Tbest1 of the second battery 32. Then, the estimated temperature Tbest2 of the second battery 32 when the second battery 32 is charged with the current (Imax / 2) for the charging time Tchg is calculated (step S320). Then, the estimated temperature Taest2 is applied to the output limiting map A2 to obtain the output limiting Wout3a of the first battery 22 when the first battery 22 is charged by the current (Imax / 2) for the charging time Tchg (step S330). The estimated temperature Tbest2 is applied to the output limiting map B2 to obtain the output limiting Wout3b of the second battery 32 when the second battery 32 is charged by the current (Imax / 2) for the charging time Tchg (step S340). Then, the output limit Wout3 is calculated as the sum of the output limit Wout3a and the output limit Wout3b (step S350).

When the output limits Wout1, Wout2, and Wout3 are calculated in this way, it is determined which of the output limits Wout1, Wout2, and Wout3 is the maximum (step S400). When it is determined in step S400 that the output limit Wout1 is the maximum, charging is performed by the first charging method of charging only the first battery 22 (step S410), and this routine is terminated. When it is determined in step S400 that the output limit Wout2 is the maximum, charging is performed by the second charging method of charging only the second battery 32 (step S420), and this routine is terminated. When it is determined in step S400 that the output limit Wout3 is the maximum, charging is performed by a third charging method for charging both the first battery 22 and the second battery 32 (step S430), and this routine is terminated. In this way, the maximum allowable power that can be output from the first battery 22 and the second battery 32 (output limit Wout) by charging by the charging method corresponding to the maximum output limit among the output limits Wout1, Wout2, and Wout3. The first battery 22 and the second battery 32 can be charged so that

In the power supply device 20 of the above-described embodiment, the output limit Wout1 when charging by the first charging method and the output limiting Wout2 when charging by the second charging method are used by using the charging time Tchg and the maximum current Imax. The output limit Wout3 when charging by the third charging method is calculated, and charging is performed by the charging method corresponding to the maximum output limit among the output limits Wout1, Wout2, and Wout3. As a result, the first battery 22 and the second battery 32 can be charged so that the maximum allowable power (output limiting Wout) that can be output from the first battery 22 and the second battery 32 becomes large.

Although the power supply device 20 of the embodiment includes two batteries of the first battery 22 and the second battery 32, it may include three batteries of the first battery, the second battery, and the third battery. In this case, only the first charging method for charging only the first battery, the second charging method for charging only the second battery, the third charging method for storing only the third battery, and only the first battery and the second battery. A fourth charging method that charges only the second battery and the third battery at the same time, a fifth charging method that charges only the second battery and the third battery at the same time, a sixth charging method that charges only the first battery and the third battery at the same time, and the first battery. Regarding the seventh charging method of simultaneously charging the second battery and the third battery, the output limits Wout1, Wout2, ..., Wout7 are obtained by using the charging time Tchg and the maximum current Imax, and the output limits Wout1, Wout2, ..., It may be charged by the charging method corresponding to the maximum output limit of Wout7. The same applies when the power supply device 20 includes four or more batteries.

In the power supply device 20 of the embodiment, the first battery 22 and the second battery 32 are charged by the converter 40 including the switching elements S1 to S4 connected in series. However, the first converter having two switching elements and one reactor connected to the first battery 22 and the second converter having two switching elements and one reactor connected to the second battery 32 are arranged in parallel. It may be connected to charge the first battery 22 and the second battery 32.

In the power supply device 20 of the embodiment, as the power storage device, the first battery 22 and the second battery 32 composed of the lithium ion secondary battery and the nickel hydrogen secondary battery are used, but any device capable of storing electricity is used. Often, a capacitor or the like may be used.

The correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment
The first battery 22 and the second battery 32 correspond to "N power storage devices", the drive device 10 corresponds to the "drive device", the converter 40 corresponds to the "charge switching device", and the electronic control unit 60. Corresponds to the "charge control device".

Although the embodiments for carrying out the present invention have been described above with reference to examples, the present invention is not limited to these examples, and various embodiments are used without departing from the gist of the present invention. Of course, it can be done.

The present invention can be used in the manufacturing industry of power supply devices and the like.

10 load, 14, 24, 34 power line, 14a, 24a, 34a positive electrode bus, 14b, 24b, 34b negative electrode bus, 16, 26, 36 capacitors, 16a, 26a, 36a voltage sensor, 18 external charger, 20 power supply , 22,32 batteries, 22a, 32a temperature sensors, 40 converters, 41,42 current sensors, 60 electronic control units, D1-D4 diodes, L1, L2 reactors, S1-S4 switching elements.

Claims (1)

A power supply device mounted on an electric vehicle having N power storage devices and a drive device that outputs power by electric power from at least one of the N power storage devices.
A charging switching device that switches and charges M charging methods using M combinations of at least one of the N power storage devices using electric power from an external charger.
A charge control device that controls the charge switching device and
With
The charge control device is
(1) Regarding the M charging methods, the temperatures of the N power storage devices when charged with a predetermined current for a predetermined time are obtained as N estimated temperatures based on the characteristics of each power storage device, and the N power storage devices are charged. By obtaining the maximum allowable power that can be output from the N power storage devices at the N estimated temperatures based on the estimated temperature and the characteristics of each power storage device, the allowable maximum power of M pieces is obtained.
(2) Control so as to charge by a charging method that can obtain the largest allowable maximum power among the M allowable maximum powers.
A power supply that is characterized by that.

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