JP2023144654A - Battery control method and battery control device - Google Patents

Abstract

To provide a battery control method capable of charging a battery by controlling Joule heat generated in the battery during charging.SOLUTION: With a battery charging control method executed by a processor, the processor detects a voltage and temperature of a battery, calculates charge power of the battery based on a limit current determined according to temperature of the battery and the detected voltage, and transmits a charge control command including information on the calculated charge power to a charger.SELECTED DRAWING: Figure 4

Description

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

2. Description of the Related Art A vehicle charging device for charging a battery mounted on a vehicle has been known (for example, Patent Document 1). The vehicle charging device described in Patent Document 1 compares an output power command value Po* based on a charging request from the battery and an output power limit value Polimit* based on the charging capacity of the power supply source, and selects the smaller value. Set the output power target value Pomin* and charge the battery.

Japanese Patent Application Publication No. 2021-78184

In battery charging control, when the temperature of the battery exceeds a threshold temperature, charging of the battery is stopped to protect the battery. If the output power command value is calculated without including the heat generated by the battery during charging into the calculation elements, the above vehicle charging device will not be able to control the Joule heat generated by the battery during charging, and the battery will become high temperature. The problem is that charging stops.

The problem to be solved by the present invention is to provide a battery control method and a battery control device that can charge the battery by controlling Joule heat generated in the battery during charging.

The present invention detects the voltage and temperature of the battery, calculates the charging power of the battery based on the current limit determined according to the temperature of the battery, and the detected voltage, and performs charging control that includes information on the calculated charging power. The above problem is solved by sending a command to the charger.

According to the present invention, the Joule heat generated in the battery during charging can be controlled and the battery can be charged.

FIG. 1 is a block diagram of a battery control system according to an embodiment of the present invention. FIG. 2 is a block diagram of the LBC and quick charger. FIG. 3 is a graph showing the characteristic of limited current with respect to battery temperature. FIG. 4 is a flowchart showing the control flow of the LBC and vehicle controller. FIG. 5 is a graph for explaining battery characteristics when high-speed driving of a vehicle and rapid charging using a rapid charger are repeatedly performed, where (a) shows the battery characteristics of a comparative example, and (b) indicates the battery characteristics of the example.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a battery control method and a battery control device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a battery control system according to an embodiment of the present invention. The battery control system includes a battery 3 including a plurality of cells (batteries) 1, an inverter 2, a relay switch 4, a motor 5, a total voltage sensor 6, a current sensor 7, a temperature sensor 8, and a lithium ion battery. It includes a controller (LBC) 100 and a vehicle controller 200. A device including at least the LBC 100 and the vehicle controller 200 corresponds to the "battery control device" of the present invention, and the control processing executed by the LBC 100 and the vehicle controller 200 corresponds to the "battery control method" of the present invention.

The battery 3 includes battery modules M1, M2, and M3 each having n cells (batteries) 1 connected in series (n is any positive integer, n=4 in the example shown in FIG. 1) as one unit. ing. For example, a lithium ion battery is used as the cell 1. The battery 3 is a secondary battery that can be charged by a charging device outside the vehicle, and by connecting the charging cable to the vehicle, the battery 3 is electrically connected to the charging device outside the vehicle in a chargeable state. Ru. Further, the battery 3 is connected to the motor 5 via the inverter 2, and the battery 3 is discharged when the motor 5 is powering, and is charged when the motor 5 is regenerating. Note that the number of battery modules is not limited to three, and may be one, two, or four or more.

The three battery modules M1 to M3 are connected in series, and a motor 5 of an electric vehicle or the like is connected to both ends of the battery modules via an inverter 2. Inverter 2 is a power conversion circuit that converts power between battery 3 and motor 5.

The relay switch 4 is connected between the battery 3, the motor 5, and the inverter 2, and turns on and off the main power source by turning it on and off.

The total voltage sensor 6 is a sensor that is connected between both poles of the battery 3 and detects the voltage of the battery 3. Current sensor 7 is connected between battery 3 and inverter 2 and detects the current output from battery 3. Temperature sensor 8 is attached to battery 3 and detects the temperature of battery 3. Note that the temperature sensors 8 are provided at a plurality of locations on the battery 3, and the average temperature of the detected values of the plurality of temperature sensors is taken as the detected temperature of the battery 3. The total voltage sensor 6, current sensor 7, and temperature sensor 8 detect the total voltage, current, and temperature of the battery 3 in response to commands from the LBC 100 and/or the vehicle controller 200, and transmit the detection results to the LBC 100 and/or the vehicle. Send to controller 200.

The LBC 100 is a controller (processor) that manages the state of the battery 3 and controls charge and discharge of the battery 3, and includes cell controllers CC1, CC2, CC3, photocouplers PC1, PC2, and a battery controller (CPU) 10. The three cell controllers CC1, CC2, and CC3 monitor the battery capacities (specifically, the voltages VC1 to VC4 of each cell) of the corresponding battery modules M1, M2, and M3. Input terminals VC1 to VC4 of each cell controller CC1 to CC3 are connected to each cell 1 of battery modules M1 to M3, and the cell controllers CC1 to CC3 are connected in cascade.

The CPU 10 transmits a command to detect the voltage of each cell 1 at a predetermined timing to the cell controllers CC1 to CC3, and the cell controllers CC1 to CC3 that receive this command detect the voltage of each cell 1. The detected voltage is held in a memory (not shown) included in each cell controller CC1 to CC3.

Further, the CPU 10 transmits a command to the cell controllers CC1 to CC3 to read the voltage of each cell 1 at a predetermined timing, and the cell controllers CC1 to CC3 that receive this command read the detected voltage held in the memory and send it to the CPU 10. Send.

Photocouplers PC1 and PC2 having electrical insulation properties are used for communication between the CPU 10 and the cell controllers CC1 to CC3. The photocouplers PC1 and PC2 each have photodiodes PD1 and PD2 which are light emitting elements, and phototransistors PT1 and PT2 which are light receiving elements.

A photocoupler is not used for communication between the cell controller CC2 and the CPU 10, and the data sent from the CPU 10 to the cell controller CC3 is sent from the cell controller CC3 to the cell controller CC2, and then from the cell controller CC2 to the cell controller CC1. A so-called cascade communication method is adopted in which the data is sent from the cell controller CC1 to the CPU 10 via the photocoupler PC2.

The vehicle controller 200 is a controller (processor) that controls the entire vehicle, such as controlling a drive system including the motor 5 and controlling auxiliary equipment systems such as lights. Further, the vehicle controller 200 also controls the battery 3 together with the battery controller 100. For example, the vehicle controller 200 limits the output torque of the motor by controlling the inverter 2 in order to prevent over-discharging or charging/discharging of the battery 3 according to the SOC (State of Charge) of the battery 3. . In the example of FIG. 1, the LCB 100 and the vehicle controller 200 are separated, but the LCB 100 and the vehicle controller 200 may be integrated into one controller. Further, the detected values of the total voltage sensor 6, current sensor 7, and temperature sensor 8 may be directly output to the battery controller 100.

Next, with reference to FIG. 2, the functions of the LBC 100 will be described. The battery controller 100 has at least a function of managing the charging/discharging current state of the battery 3 and a function of controlling charging of the battery 3 . As shown in FIG. 2, the battery controller 100 includes a charging current calculating section 11, an SOC calculating section 12, a charging power calculating section 13, a full charge determining section 14, and an allowable charging power calculating section 15 as functional blocks. A program for realizing each function in each functional block is stored in the memory. A processor included in the controller/battery controller executes the program to realize each function of the functional block. Note that the number of functional blocks is not limited to five, and may be one to four or five or more.

The charging current calculating unit 11 has a map (hereinafter referred to as a temperature-limiting current map) showing the relationship between the limiting current according to the temperature of the battery 3, and refers to the map to calculate the detected temperature of the battery 3. Calculate the limited current determined accordingly. The limiting current is a current that is set to keep the temperature of the battery 3 below the upper limit temperature even if Joule heat is generated when charging the battery 3, and is determined experimentally depending on the material and performance of the battery 3. It will be done. FIG. 3 is a graph for explaining the temperature-limited current map, and is a graph showing the characteristic of the limited current with respect to the temperature of the battery 3. The solid line graph shows the characteristics when the battery is new, and the dotted line graph shows the characteristics when the battery is deteriorated.

Here, the relationship between Joule heat generated when charging the battery 3 and the temperature of the battery 3 will be explained. When charging the battery 3 using the external quick charger 300, the battery controller 100 calculates charging power according to the state of the battery 3 while charging the battery 3, and quickly charges the calculated charging power. A charging control command is transmitted to the quick charger 300 so that it is input from the charger 300 to the battery 3. The quick charger 300 sets the output power so that the battery 3 is supplied with charging power according to the charging control command, and outputs the output power to the battery 3. Generally, the charging power calculated on the battery controller 100 side is calculated from the current voltage of the battery 3, the upper limit voltage of the battery 3, and the internal resistance of the battery 3.

When the battery 3 is rapidly charged, the current input to the battery 3 is large. Therefore, Joule heat is generated in the battery 3. Since Joule heat is proportional to the square of the current, the amount of heat generated by Joule heat increases during rapid charging with a high charging current. When the temperature of the battery 3 rises due to Joule heat while the battery 3 is being charged, the temperature of the battery 3 reaches the upper limit temperature that protects the battery 3, so charging is stopped. Such a charging stop due to Joule heat is likely to occur, for example, in situations where rapid charging is required repeatedly in order to travel a long distance on a highway.

Note that there are conventional techniques for calculating charging power using battery temperature, but most of these techniques use battery temperature to calculate the internal resistance of battery 3. Therefore, it is difficult to prevent charging from being stopped due to Joule heat generation only by including the battery temperature element in the internal resistance calculation process.

In this embodiment, the battery controller 100 stores a temperature-limiting current map in advance in order to prevent the charging stop phenomenon due to Joule heat, and calculates the limiting current with reference to the map to charge the battery 3. Controls the Joule heat that sometimes occurs.

As shown in FIG. 3, when the battery temperature ranges from 0° C. to T ₁ , the limited current is at a constant high level (I _L0 ). The maximum level of limited current (I _L0 ) is a current value that matches the upper limit power of the charger used, and may be a current value that can be changed depending on the charging method, such as normal charging or quick charging. When the temperature of the battery 3 is T ₁ , the limiting current is at a level (I _L1 ) lower than I _L0 . When the temperature of the battery 3 is in the range from _T1 to _T2 , the limited current is at a level lower than _IL1 , and becomes lower as the temperature of the battery 3 increases. Then, when the temperature of the battery 3 reaches _T2 , the limited current becomes zero. When the battery 3 is degraded, the limited current when the temperature of the battery 3 is T ₁ becomes a level (I _L2 ) lower than I _L1 . In this way, the limited current when the temperature of the battery 3 is equal to or higher than the threshold temperature (T ₁ ) is lower than the limited current when the temperature of the battery 3 is less than the threshold temperature (T ₁ ).

As shown in Figure 3, when the battery temperature is in the range from 0°C to _T1 , even if Joule heat is generated during rapid charging, the battery 3 temperature is unlikely to reach the upper limit temperature, so the limiting current is set at a high level. (I _L0 ), which enables charging according to the upper limit power of the quick charger 300. On the other hand, when the temperature of the battery 3 is T1 _or more, the limiting current is lowered in accordance with the temperature of the battery 3 so that the charging current becomes smaller, and Joule heat generation is limited to a certain value or less. Furthermore, when the battery 3 deteriorates, the limiting current is set to be lower than when the battery 3 is new on the high temperature side of the battery 3 (the temperature of the battery 3 is T1 _or higher).

Note that the characteristic of the limited current according to the temperature of the battery 3 is not necessarily limited to the characteristic shown in FIG. 3, but may be a characteristic that monotonically decreases within the operating temperature range of the battery 3, for example. That is, the temperature characteristic of the limited current may be such that the limited current when the temperature of the battery 3 is above a predetermined value is lower than the limited current when the temperature of the battery 3 is less than the predetermined value.

The charging current calculating section 11 calculates a charging current according to the current charging state of the battery 3, in addition to calculating the above-mentioned limit current. The state of charge is indicated by the current voltage or current SOC of the battery 3. Specifically, the charging current calculation unit 11 calculates the charging current from the detected voltage of the total voltage sensor 6 (voltage of the battery 3), the target voltage, and the internal resistance of the battery 3. The voltage of the battery 3 is the voltage detected by the total voltage sensor 6. The target voltage is, for example, a voltage corresponding to a target SOC specified by the user, an upper limit voltage of the battery 3 when charging to full charge, or a voltage determined from the charging sequence during charging. The charging sequence is a charging method according to the charging control method, and is, for example, a method of charging in the order of precharging, constant current charging (CC method), and constant voltage charging (CV method). The internal resistance of the battery 3 is calculated from the degree of deterioration of the battery 3 and the current-voltage characteristics (IV characteristics) of the battery 3. The degree of deterioration may be calculated from the number of times of charging, the ratio of the current battery capacity to the initial battery capacity, and the like. Note that in the following description, the target voltage or target SOC will be described with reference to the voltage and SOC that aim to fully charge the battery 3.

Furthermore, the charging current calculation unit 11 compares the charging current calculated above with the limit current, and selects the lower current as the final charging current set at the time of charging. For example, if the temperature of the battery 3 is less than T ₁ and the current SOC of the battery 3 is sufficiently low with respect to the target SOC, the limiting current is selected as the charging current. Additionally, if the temperature of the battery 3 is less than _T1 and the current SOC of the battery 3 is close to full charge (80% to 100%), the battery 3 is charged in the CC method under the charging sequence. Therefore, the charging current calculation unit 11 selects the charging current calculated according to the current charging state of the battery 3 as the final charging current. Further, when the temperature of the battery 3 is T1 _or higher, the limiting current is lower than the charging current calculated according to the current charging state of the battery 3, except when the battery 3 is almost fully charged. The charging current calculation unit 11 selects the limited current as the final charging current. The charging current calculation unit 11 then outputs the selected charging current to the charging power calculation unit 13.

The SOC calculation unit 12 calculates the SOC (State of Charge) from the current voltage of the battery 3. The SOC calculation unit 12 calculates the SOC from the correlation between the voltage of the battery 3 and the SOC or from the current integration during charging and discharging of the battery 3.

The charging power calculation unit 13 calculates charging power for full charge determination and inputtable power. The charging power for full charge determination indicates the power required to charge up to the target SOC. The charging power calculation unit 13 calculates charging power for full charge determination by multiplying the charging current input from the charging current calculation unit 11 by the current voltage of the battery 3. The inputtable power is a power determined according to the upper limit charging voltage of the battery 3, and is determined experimentally according to the performance of the battery 3 and the like. The inputtable power indicates the power that can be input to the battery 3 in order to charge the battery 3 from its current state (SOC) to full charge, and is also referred to as chargeable power. The upper limit voltage of the battery 3 is set in advance to prevent the battery 3 from overdischarging, and is the upper limit value of the charging voltage. Then, the charging power calculation unit 13 calculates the inputtable power based on the current SOC of the battery 3.

The full charge determination unit 14 determines whether the battery 3 is fully charged based on the charging power for determining full charge. When the charging power for full charge determination is zero, the full charge determination unit 14 determines that the battery is fully charged. Further, when the charging power for full charge determination is greater than zero, the full charge determination unit 14 determines that the battery is not fully charged.

The allowable charging power calculation unit 15 calculates the allowable charging power based on the full charge determination result, the charging power for full charge determination, and the inputtable power. The allowable charging power represents a power value that can be permitted to be input to the battery 3 in order to charge the battery from its current state to full charge without causing the battery temperature to reach the upper limit due to Joule heat generation. When the full charge determination result indicates that the battery is fully charged, the allowable charge power calculation unit 15 calculates the allowable charge power as zero. When the full charge determination result is "not fully charged", the allowable charging power calculation unit 15 calculates the lower of the charging power for full charge determination and the inputtable power as the allowable charging power. . Then, the charging allowable power calculation unit 15 outputs a charging control command including information on the calculated charging allowable power to the quick charger 300.

During charging of the battery 3, the quick charger 300 receives a charging control command from the battery controller 100, and outputs power to the battery 3 via the charging cable in accordance with the charging allowable power included in the charging control command.

Hereinafter, a method of controlling the LBC 100 and the vehicle controller 200 will be described with reference to FIG. 4. FIG. 4 is a flowchart showing the control flow of the LBC 100 and the vehicle controller 200. With the quick charger 300 connected to the vehicle via the charging cable, the LBC 100 and the vehicle controller 200 execute the control flow shown in FIG. Start.

In step S1, the battery controller 100 detects the state of the battery (voltage, current, temperature) using the total voltage sensor 6, current sensor 7, and/or temperature sensor 8. The battery controller 100 also calculates the SOC of the battery 3. In step S2, the battery controller 100 calculates the charging current of the battery 3. The control flow in step S2 corresponds to calculation processing by the charging current calculation section 11.

In step S3, the battery controller 100 calculates the charging power of the battery 3 based on the limited current determined according to the temperature of the battery 3 and the detected voltage. The control flow of step S3 corresponds to the calculation process of charging power for full charge determination among the calculation processes of the charging power calculation unit 13.

In step S4, the battery controller 100 determines whether the charging power (charging power for full charge determination) calculated in the calculation process of step S3 is less than or equal to a predetermined value. The predetermined value is zero or a low non-zero value. If the charging power is greater than the predetermined value, the battery controller 100 determines that the battery is not fully charged (step S5). If the charging power is less than or equal to the predetermined value, the battery controller 100 determines that the battery is fully charged (step S6). Note that the control processing from step S4 to step S6 corresponds to the determination processing by the full charge determination section 14.

In step S7, the battery controller 100 calculates inputtable power based on the current SOC of the battery 3. The control processing in step S7 corresponds to the calculation processing of inputtable power among the calculation processing of the charging power calculation section 13. In step S8, battery controller 100 calculates allowable charging power. In step S9, battery controller 100 transmits a charging control command including charging power information to quick charger 300. Note that the charging power included in the charging control command includes the calculation results of each functional block included in the battery controller 100, but the charging power included in the charging control command differs depending on the state of the battery 3. For example, when the temperature of the battery 3 is high, information on the charging power calculated based on the limited current and the voltage of the battery 3 is included in the charging control command in order to suppress Joule heat generation. Further, for example, if the inputtable power is smaller than the charging power for full charge determination, information on the inputtable power is included in the charging control command. Note that the control processing in steps S8 and S9 corresponds to the calculation processing of the charge permissible power calculation section 15.

In step S10, battery controller 100 determines whether a charging stop command has been received. The charging stop command is a command to stop charging before the battery 3 is fully charged, and is issued, for example, by a user's operation, a timer setting, a failsafe, or the like. If a charging stop command has not been received, the control flow by battery controller 100 returns to step S1, and charging continues.

If it is determined that the battery is fully charged in the control process of step S6, or if a charge stop command is received in the control process of step S11, the battery controller 100 outputs a charge end command to the quick charger 300 ( Step S11). Then, the battery controller 100 ends the control flow shown in FIG. 3.

Next, with reference to FIG. 5, the battery characteristics when the vehicle is repeatedly driven at high speed and rapidly charged using the quick charger 300 will be described. In the following explanation, we will discuss the case where rapid charging is repeatedly performed under the charging control according to this embodiment (hereinafter referred to as an example) and the case where rapid charging is repeatedly performed without controlling Joule heat as in this embodiment. After comparing the case (hereinafter referred to as a comparative example), the battery characteristics will be explained. FIG. 5(a) shows the battery characteristics of the comparative example, and FIG. 5(b) shows the battery characteristics of the example. Among the graphs shown in FIGS. 5(a, b), the first graph from the top shows the SOC characteristics, the second graph shows the input/output power characteristics, and the third graph shows the temperature characteristics. Regarding the second input/output power characteristic, the power on the positive side represents the running power consumed when the vehicle is running, and the power on the negative side represents the charging power. Regarding the third graph, T _lim indicates the upper limit temperature of the battery 3, and when the temperature of the battery 3 is higher than the upper limit temperature (T _lim ), the output is limited and the charging/discharging power of the battery 3 is forced. can be suppressed.

As shown in FIG. 5(a), in the comparative example, the first quick charge was able to fully charge the battery, but since Joule heat was not controlled, the battery temperature at the end of charging was high. Then, during the second quick charge, the battery temperature becomes equal to or higher than the upper limit temperature (T _lim ), and the output is limited. Therefore, the amount of charge in the second quick charge is smaller than that in the first charge. In addition, since the temperature of the battery 3 is high when the vehicle starts driving after the second quick charge, the output is limited even during driving. Similarly, even after the third quick charge, the amount of charge decreased.

As shown in FIG. 5(b), in the example, since Joule heat is controlled, the battery temperature when the battery is fully charged in the first quick charge is lower than that in the comparative example. Even during the second and subsequent rapid charging, the temperature rise of the battery 3 is suppressed by controlling Joule heat, so there is no output restriction due to the upper limit temperature (T _lim ) as in the comparative example. It becomes possible to charge the battery 3 and drive the vehicle. The second and third quick charges also have the same amount of charge as the first quick charge. In other words, in the embodiment, even if rapid charging is repeatedly performed, a stable charge amount can be ensured.

As described above, the battery control method and battery control device according to the present embodiment detect the voltage and temperature of the battery 3, and determine the current limit determined according to the temperature of the battery 3 and the detected voltage. Charging power is calculated, and a charging control command including information on the calculated charging power is transmitted to the charger. Thereby, the Joule heat generated in the battery 3 during charging can be controlled and the battery 3 can be charged. Furthermore, by controlling the Joule heat, a rise in the temperature of the battery 3 during charging is suppressed, so that charging restrictions due to a rise in the temperature of the battery 3 are less likely to occur.

In particular, as shown in Figure 1, when a plurality of cells 1 included in the battery 3 are connected in series, charging Since the amount of current that is input becomes large at times, Joule heat is likely to be generated. Therefore, as in this embodiment, by controlling the Joule heat generated in the battery 3 during charging, the temperature rise in the battery 3 can be suppressed.

Furthermore, in this embodiment, the limited current when the temperature of the battery 3 is equal to or higher than the predetermined value is smaller than the limited current when the temperature of the battery 3 is less than the predetermined value. As a result, the magnitude of the limited current changes depending on the temperature of the battery 3, so that an excessive rise in temperature of the battery 3 can be suppressed.

In addition, as a modification of the present embodiment, the battery controller 100 calculates the degree of deterioration of the battery 3, calculates the limit current according to the calculated degree of deterioration, and adjusts the charging power of the battery based on the calculated limit current. may be calculated. When the battery 3 deteriorates, its internal resistance increases, so the amount of Joule heat generated increases. Therefore, as shown in FIG. 3, in the high temperature range of the battery 3 (above the threshold temperature (T ₁ )), the limiting current is lowered when the battery 3 deteriorates. The battery controller 100 stores in advance a temperature-limited current map corresponding to the degree of deterioration of the battery 3, refers to the temperature-limited current map, and calculates a limited current according to the current battery temperature and degree of deterioration. Thereby, when the battery 3 deteriorates, by lowering the limiting current, the Joule heat generated in the battery 3 can be controlled, and even when the battery 3 deteriorates, it is difficult to limit the output due to a rise in the temperature of the battery 3.

Note that the battery controller 100 and the vehicle controller 200 correspond to the "controller" of the present invention, and the quick charger 300 corresponds to the "charger" of the present invention.

Note that the embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design changes and equivalents that fall within the technical scope of the present invention.

1 Cell 2 Inverter 3 Battery 4 Relay switch 5 Motor 6 Total voltage sensor 7 Current sensor 8 Temperature sensor 11 Charging current calculating section 12 SOC calculating section 13 Charging power calculating section 14 Full charge determining section 15 Allowable charging power calculating section 100 Battery controller ( LBC)
200 Vehicle controller 300 Quick charger

Claims (6)

A battery charging control method executed by a processor, the method comprising:
The processor includes:
detecting the voltage and temperature of the battery;
Calculating the charging power of the battery based on the limited current determined according to the temperature of the battery and the detected voltage,
A charging control method that transmits a charging control command including information on the calculated charging power to a charger that charges the battery. The charging control method according to claim 1,
The charging control method in which the limited current when the temperature of the battery is above a predetermined value is smaller than the limited current when the temperature of the battery is less than the predetermined value. The charging control method according to claim 1 or 2,
The processor includes:
Calculating the degree of deterioration of the battery,
Calculating the limiting current according to the calculated degree of deterioration,
A charging control method that calculates charging power for the battery based on the calculated limit current. battery and
and a controller that controls the output of the battery,
The controller includes:
detecting the voltage and temperature of the battery;
Calculating the charging power of the battery based on the limited current determined according to the temperature of the battery and the detected voltage,
A charging control device that transmits a charging control command including information on the calculated charging power to a charger that charges the battery. The charging control device according to claim 4,
The charging control device wherein the limiting current when the temperature of the battery is equal to or higher than the predetermined value is smaller than the limiting current when the temperature of the battery is less than the predetermined value. The charging control device according to claim 4 or 5,
The controller includes:
Calculating the degree of deterioration of the battery,
Calculating the limiting current according to the calculated degree of deterioration,
A charging control device that calculates charging power for the battery based on the calculated limit current.

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