Battery management system, battery device including same, and charging control method

Abstract

This battery management system wakes up on the basis of a first control signal provided from an AC charger or a DC charger in response to a connection between a vehicle and the AC charger or the DC charger. In addition, the battery management system: determines a connection state between the vehicle and the AC charger or the DC charger on the basis of a voltage of a second control signal, which is determined on the basis of the connection between the vehicle and the AC charger, or a voltage of a third control signal, which is determined on the basis of the connection between the vehicle and the DC charger; and performs charging by selecting an AC charging mode or a DC charging mode on the basis of the voltage of the second control signal and the voltage of the third control signal.

Description

Battery management system, battery device including same, and charging control method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0102320, dated August 4, 2023, the entire contents of which are incorporated herein by reference.

[0003] The disclosure relates to a battery management system, a battery device including the same, and a charging control method.

[0004] Rechargeable batteries are used as the energy source for vehicles. These batteries are provided in the form of battery packs, and a battery management system (BMS) is used to manage them. Various chargers are used to charge the battery packs installed in vehicles. Instead of the vehicle's electronic control unit (ECU) or on-board charger (OBC), the BMS is required to control the charging of these various chargers.

[0005] Some embodiments may provide a battery management system capable of performing charging control of various chargers, a battery device including the same, and a charging control method.

[0006] According to some embodiments, a battery device mounted on a vehicle may include a battery module and a battery management system. The battery management system may wake up based on a first control signal provided from an AC (alternate current) charger or a DC (direct current) charger in response to a connection between the vehicle and the AC charger or the DC charger, determine a connection state between the AC charger or the DC charger and the vehicle based on a voltage of a second control signal determined based on a connection between the AC charger and the vehicle or a voltage of a third control signal determined based on a connection between the DC charger and the vehicle, and perform charging by selecting an AC charging mode or a DC charging mode based on the voltage of the second control signal and the voltage of the third control signal.

[0007] According to some embodiments, a battery management system of a battery device mounted on a vehicle may include a connector, a first control circuit, and a processor. The connector is connected to an AC charger or a DC charger and may receive a first control signal provided from the AC charger or the DC charger in response to the connection of the AC charger or the DC charger. The first control circuit is connected to the connector and may determine a voltage of a second control signal based on a connection between the AC charger and the vehicle, and may determine a voltage of a third control signal based on a connection between the DC charger and the vehicle. The processor may wake up the battery management system in response to the first control signal of the connector, determine a connection state between the AC charger or the DC charger and the vehicle based on the voltage of the second control signal or the voltage of the third control signal, and perform charging by selecting an AC charging mode or a DC charging mode based on the voltage of the second control signal and the voltage of the third control signal.

[0008] In some embodiments, a method for controlling charging of a battery management system may include a step of receiving a predetermined voltage in response to a connection between a vehicle equipped with the battery management system and a charger, a step of waking up in response to the predetermined voltage, a step of selecting an AC charging mode or a DC charging mode based on a voltage of a control signal determined based on the connection between the charger and the vehicle, and a step of determining a connection state between the charger and the vehicle based on the voltage of the control signal.

[0009] FIG. 1 is a drawing showing an example of a charging system according to one embodiment.

[0010] FIG. 2 is a drawing showing an example of a battery device according to one embodiment.

[0011] FIG. 3 is a diagram illustrating an example of a battery management system according to one embodiment.

[0012] FIG. 4 is a flowchart illustrating an example of an AC charging control method in a battery management system according to one embodiment.

[0013] FIG. 5 is a flowchart illustrating an example of a DC charging control method in a battery management system according to one embodiment.

[0014] FIG. 6 is a diagram showing an example of operation timing for AC charging of a battery management system according to one embodiment.

[0015] FIG. 7 is a diagram showing an example of operation timing for DC charging of a battery management system according to one embodiment.

[0016] FIG. 8 is a drawing showing an example of a battery device according to one embodiment.

[0017] FIGS. 9 and 10 are diagrams each illustrating an example of insulation resistance measurement in a battery device in one embodiment.

[0018] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description are omitted for clarity of description, and similar parts are designated with similar reference numerals throughout the specification.

[0019] When a component is said to be "connected" to another component, it should be understood that while it may be directly connected to that other component, there may be other components intervening. Conversely, when a component is said to be "directly connected" to another component, it should be understood that there are no other components intervening.

[0020] In the description below, expressions written in the singular may be interpreted as singular or plural, unless explicit expressions such as “one” or “single” are used.

[0021] In the flowchart described with reference to the drawing, the order of operations may be changed, several operations may be merged, some operations may be split, and certain operations may not be performed.

[0022] FIG. 1 is a drawing showing an example of a charging system according to one embodiment.

[0023] Referring to FIG. 1, a charging system (100) may include a vehicle (110), an alternating current (AC) charger (120), and a direct current (DC) charger (130).

[0024] The AC charger (120) can supply AC power to the vehicle (110) to charge the battery module (111b) of the vehicle (110). The DC charger (130) can supply DC power to the vehicle (110) to charge the battery module (111b) of the vehicle (110). In some embodiments, the AC charger (120) can include a control device that controls AC charging. In some embodiments, the DC charger (130) can include an off-board charger that controls DC charging, and the off-board charger can include an AC-DC converter that converts AC power into DC power to supply DC power and a DC-DC converter that converts DC power into DC power.

[0025] A vehicle (110) may include a battery device (111) and an on-board charger (OBC) (112). The battery device (111) may be referred to as a battery pack. The battery device (111) may include a battery module (111b) and a battery management system (111a) that manages the operation of the battery module (111b). The battery module (111b) may include a plurality of battery cells. The battery cells may be rechargeable battery cells. In some embodiments, the battery device (111) may include a plurality of battery modules (111b) connected in series and / or in parallel. The battery module (111b) may be referred to as a battery pack that does not include the battery management system (111a). The vehicle (110) may further include an electronic control unit (ECU) (113) that controls one or more electrical systems in the vehicle (110) including the battery management system (111a).

[0026] When the vehicle (110) is connected to an AC charger (120) for charging, the AC charger (120) can supply AC power to the vehicle (110). The OBC (112) can include an AC / DC converter that converts AC power supplied from the AC charger (120) into DC power. The battery management system of the battery device (111) can control charging of the battery module (111b) using the DC power delivered through the OBC (112).

[0027] When a vehicle (110) is connected to a DC charger (130) for charging, the DC charger (130) can supply DC power to the vehicle (110). The battery management system (111a) of the battery device (111) can control charging of the battery module (111b) using the DC power supplied from the DC charger (130).

[0028] FIG. 2 is a drawing showing an example of a battery device according to one embodiment.

[0029] Referring to FIG. 2, the battery device (200) may include a battery module (210), a positive switch (221), a negative switch (222), and a battery management system (230).

[0030] The battery module (210) may include a plurality of battery cells. In some embodiments, the battery device (200) may include a plurality of battery modules (210) connected in series and / or in parallel.

[0031] The positive switch (221) may be connected between the positive terminal of the battery module (210) and the positive link terminal (DC(+)) of the battery device (200), and the negative switch (222) may be connected between the negative terminal of the battery module (210) and the negative link terminal (DC(-)) of the battery device (200). The switches (221, 222) may be charge control switches controlled by the battery management system (230) to control a charging path between the battery module (210) and the charger (20). When charging the battery device (200), the positive link terminal (DC(+)) and the negative link terminal (DC(-)) may be connected to the charger (20). When the positive switch (221) and the negative switch (222) are closed under the control of the battery management system (230), power (e.g., charging current) is supplied from the charger (20) to the battery module (210), so that the battery module (210) can be charged. The closing of the switch can be expressed as the switch being turned on, and the opening of the switch can be expressed as the switch being turned off. In some embodiments, the switches (221, 222) can each be formed as a relay.

[0032] In some embodiments, the charger (20) may be connected to the battery module (210) without going through the link terminals (DC(+), DC(-)) and switches (221, 222) of the battery device (200). In this case, the charging path between the battery module (210) and the charger (20) may be controlled according to the control of the charge control switch of the charger (20).

[0033] FIG. 3 is a diagram illustrating an example of a battery management system according to one embodiment.

[0034] Referring to FIG. 3, the battery management system (300) may include a connector (310) and a processor (320). The battery management system (300) may support AC charging when an AC charger (31) is connected to a vehicle (30) equipped with a battery device, and may support DC charging when a DC charger (32) is connected to the vehicle (30).

[0035] The connector (310) can be used to connect an AC charger (31) and a battery management system (300) and a DC charger (32) and a battery management system (300). In some embodiments, the connector (310) can be connected to an OBC (33) mounted on a vehicle (30) for AC charging of the AC charger (31). The processor (320) can control AC charging when the AC charger (31) is connected to the vehicle (30), and can control DC charging when the DC charger (32) is connected to the vehicle (30). In some embodiments, the processor (320) can be a processing circuitry, for example, a microcontroller unit (MCU).

[0036] In some embodiments, when the AC charger (31) is connected to the vehicle (30), a control signal (DC1) having a predetermined voltage may be received from a control device (31a) of the AC charger (31). The connector (310) may provide a wakeup signal (WK_ACC) corresponding to the control signal (DC1) to the processor (320). In some embodiments, the control signal (DC1) from the AC charger (31) may be transmitted to the OBC (33), and the OBC (33) may transmit the control signal (DC1) or a signal corresponding to the control signal (DC1) to the connector (310). In some embodiments, the battery management system (300) may further include an analog-to-digital converter, and the wakeup signal (WK_ACC) transmitted from the connector (310) may be converted into a digital signal (ADC_WK_ACC) by the analog-to-digital converter and provided to the processor (320). The processor (320) can wake up in response to a wake-up signal (ADC_WK_ACC) and wake up the battery management system (300).

[0037] In some embodiments, when the DC charger (32) is connected to the vehicle (30), the connector (310) may receive a control signal (DC2) having a predetermined voltage from an off-board charger (32a) of the DC charger (32). The connector (310) may provide a wake-up signal (WK_DCC) corresponding to the control signal (DC2) to the processor (320). In some embodiments, the wake-up signal (WK_DCC) transmitted from the connector (310) may be converted into a digital signal (ADC_WK_DCC) by an analog-to-digital converter and provided to the processor (320). The processor (320) may wake up in response to the wake-up signal (ADC_WK_DCC) and wake up the battery management system (300).

[0038] In some embodiments, the battery management system (300) may further include a voltage supply circuit (330). The voltage supply circuit (330) may supply various operating voltages used in the battery management system (300). In some embodiments, the voltage supply circuit (330) may supply a first operating voltage (Vs1) (e.g., 12 V) used in the internal circuit of the battery management system (300) and a second operating voltage (Vs2) (e.g., 5 V) used for the operation of the processor (320). In some embodiments, the voltage supply circuit (330) may include a DC-DC converter (331) and a power management circuit (e.g., a power management integrated circuit (PMIC)) (332). The DC-DC converter (331) may include, for example, a buck converter, and the PMIC (332) may include, for example, a regulator such as a low-dropout regulator (LDO).

[0039] The DC-DC converter (331) can receive an auxiliary voltage from the auxiliary battery (34) of the vehicle (30) through the connector (310) and generate a first operating voltage (Vs1) based on the auxiliary voltage. The PMIC (332) can receive the first operating voltage (Vs1) and generate a second operating voltage (Vs2) lower than the first operating voltage (Vs1) based on the first operating voltage (Vs1). In some embodiments, the wake-up signal (WK_ACC, WK_DCC) can be transmitted to the voltage supply circuit (330) to enable the voltage supply circuit (330), for example, the DC-DC converter (331). In some embodiments, a diode (D1) for blocking current in the opposite direction may be connected between the wake-up signal (WK_ACC) output port of the connector (310) and the enable port of the voltage supply circuit (330), for example, the DC-DC converter (331), and a diode (D2) for blocking current in the opposite direction may be connected between the wake-up signal (WK_DCC) output port of the connector (310) and the enable port of the voltage supply circuit (330), for example, the DC-DC converter (331).

[0040] In some embodiments, the connector (310) may receive a control signal (CC1) for connection confirmation from the control device (31a) of the AC charger (31). This control signal (CC1) may be referred to as a connection confirm (CC) signal (CC1). The connection confirm signal (CC1) may be determined based on the connection between the AC charger (31) and the vehicle (30). In some embodiments, the connection confirm signal (CC1) may be determined by a resistor (not shown) used to transmit the connection confirm signal (CC1) from the control device (31a) of the AC charger (31) and a resistor (R1) of the battery management system (300). The resistor used to transmit the connection confirm signal (CC1) from the control device (31a) may be determined based on the connection status between the vehicle (30) and the AC charger (31). A resistor (R1) may be connected between a line supplying a first operating voltage (Vs1) and an output port of a connection confirmation signal (CC1) of a connector (310). Accordingly, a voltage obtained by dividing the first operating voltage (Vs1) by the resistor (R1) of the control device (31a) and the battery management system (300) may be determined as a connection confirmation signal (CC1). The processor (320) may determine a connection state (e.g., whether it is fully connected) between the AC charger (31) and the vehicle (30) based on the voltage of the connection confirmation signal (CC1). In some embodiments, an analog-to-digital converter of the battery management system (300) may convert the connection confirmation signal (CC1) into a digital signal (ADC_ACCon) and transmit it to the processor (320).

[0041] In some embodiments, the connector (310) may receive a control signal (CC2) for connection confirmation from the off-board charger (32a) of the DC charger (32). This control signal (CC2) may be referred to as a connection confirmation signal (CC2). The connection confirmation signal (CC2) may be determined based on the connection between the DC charger (32) and the vehicle (30). In some embodiments, the connection confirmation signal (CC2) may be determined by a resistor (not shown) used to transmit the connection confirmation signal (CC2) from the off-board charger (32a) of the DC charger (32) and a resistor (R2) of the battery management system (300). The resistor used to transmit the connection confirmation signal (CC2) from the off-board charger (32a) may be determined based on the connection status of the vehicle (30) and the DC charger (32). The resistor (R2) may be connected between a line supplying the first operating voltage (Vs1) and a connection confirmation signal (CC2) output port of the connector (310). Accordingly, the voltage obtained by dividing the first operating voltage (Vs1) by the resistance of the off-board charger (32a) and the resistance (R2) of the battery management system (300) can be determined as the connection confirmation signal (CC2). The processor (320) can determine the connection status (e.g., whether it is fully connected) between the DC charger (32) and the vehicle (30) based on the voltage of the connection confirmation signal (CC2). In some embodiments, the analog-to-digital converter of the battery management system (300) can convert the connection confirmation signal (CC2) into a digital signal (ADC_DCCon) and transmit it to the processor (320).

[0042] In some embodiments, a control circuit including resistors (R1, R2) may be referred to as a connection confirmation circuit. The connection confirmation circuit is connected to a connector (310) and may determine the voltage of a connection confirmation signal (CC1) based on the connection between an AC charger (31) and a vehicle (30), and may determine the voltage of a connection confirmation signal (CC2) based on the connection between a DC charger (32) and a vehicle (30).

[0043] In some embodiments, the connector (310) may receive a pulse width modulation (PWM) signal from the AC charger (31) as a control signal and transmit the PWM signal to the processor (320). The PWM signal may be referred to as a control pilot (CP) signal. In some embodiments, an analog-to-digital converter of the battery management system (300) may convert the PWM signal into a digital signal and provide it to the processor (320). The processor (320) may determine whether the AC charger (31) is ready for charging by measuring the PWM signal.

[0044] In some embodiments, the battery management system (300) may further include a PWM control circuit (340). The PWM control circuit (340) may be referred to as a “control pilot circuit.” The PWM control circuit (340) may transmit a PWM signal transmitted from the AC charger (31) through the connector (310) to the processor (320), and may lower the voltage level of the PWM signal during AC charging and transmit it to the processor (320).

[0045] In some embodiments, the PWM control circuit (340) may include resistors (R3, R4) connected in series between the PWM signal output port and the ground terminal of the connector (310), a resistor (R5) connected in series between the PWM signal output port and the ground terminal, and a switch (S1). In some embodiments, the PWM control circuit (340) may further include a diode (D3) for blocking current to the PWM signal output port. Before AC charging, the switch (S1) may be turned off, so that a voltage divided by the resistors (R3, R4) and the resistance of the AC charger (31) may be provided to the processor (320) as a PWM signal. The processor (320) may determine the duty cycle and / or frequency of the PWM signal based on the PWM signal output from the contact points of the resistors (R3, R4). During AC charging, the switch (S1) may be turned on in response to a control signal (CTRL_CP) from the processor (320), so that a PWM signal having a lower voltage level than before AC charging may be provided to the processor (320). In some embodiments, the PWM control circuit (340) may further include resistors (R6, R7) connected in series between the PWM signal output port of the connector (310) and the ground terminal. A voltage divided by the resistors (R6, R7) and the resistance of the AC charger (31) may be provided to the processor (320) as a PWM signal. The processor (320) may check the voltage level of the PWM signal based on a voltage (ADC) converted by an analog-to-digital converter from the PWM signal output from the contact points of the resistors (R6, R7).

[0046] In some embodiments, when the AC charger (31) is ready to charge, the processor (320) may output a control signal (CTRL_ACC) to turn on a charge control switch that controls a charging path between a battery module (e.g., 210 of FIG. 2) of the battery device and a terminal for transmitting a charging current from a control device (31a) of the AC charger (31). In some embodiments, in response to the control signal (CTRL_ACC), the switch (S2) may be turned on so that a control signal having a first operating voltage (Vs1) may be transmitted to the charge control switch via the connector (310). In addition, when the DC charger (32) is ready to charge, the processor (320) may output a control signal (CTRL_DCC) to turn on a charge control switch that controls a charging path between a battery module (210) of the battery device and a terminal for transmitting a charging current from an off-board charger (32a) of the DC charger (32). In some embodiments, in response to a control signal (CTRL_DCC), the switch (S3) may be turned on so that a control signal having a first operating voltage (Vs1) may be transmitted to the charge control switch via the connector (310).

[0047] In some embodiments, the battery management system (300) may further include a transceiver (350). In some embodiments, the transceiver (350) may be a controller area network (CAN) transceiver for CAN communication. The processor (320) may communicate with the off-board charger (32a) of the DC charger (32) through the transceiver (350) and the connector (310). For example, the processor (320) may communicate with the connector (310) through differential CAN signals (CAN-H_DC, CAN-L_DC) through the transceiver (350), and the connector (310) may communicate with the off-board charger (32a) of the DC charger (32) through differential CAN signals (CAN-H_DCC, CAN-L_DCC).

[0048] In some embodiments, the off-board charger (32a) of the DC charger (32) may be grounded (GND) via a connector (310).

[0049] As described above, the battery management system (300) can wake up based on a control signal (DC1 or DC2) provided from the charger in response to the connection between the vehicle (30) and the charger (31 or 32), determine the full connection between the charger (31 or 32) and the vehicle (30) based on the voltage of the control signal (CC1) determined based on the connection between the AC charger (31) and the vehicle (30) or the voltage of the control signal (CC2) determined based on the connection between the DC charger (32) and the vehicle (30), and proceed with charging by selecting an AC charging mode or a DC charging mode based on the voltage of the control signal (CC1) and the voltage of the control signal (CC2). In this way, the battery management system (300) can selectively support AC charging and DC charging depending on the type of charger connected to the vehicle (30).

[0050] Next, a method for controlling AC charging and DC charging in a battery management system will be described with reference to FIGS. 3 to 5.

[0051] FIG. 4 is a flowchart illustrating an example of an AC charging control method in a battery management system according to one embodiment.

[0052] Referring to FIGS. 3 and 4, when an AC charger (31) is connected to a vehicle (30), the battery management system (300) can perform AC charging. When the AC charger (31) is connected to the vehicle (30), the processor (320) of the battery management system (300) can wake up the battery management system (300) in response to the connection between the AC charger (31) and the vehicle (30) (S410, S420).

[0053] In some embodiments, when the AC charger (31) is connected to the vehicle (30), the vehicle (30) may detect a predetermined voltage. In some embodiments, when the AC charger (31) is connected to the vehicle (30), the OBC (33) may transmit a wake-up signal (WK_ACC) corresponding to the predetermined signal (DC1) from the AC charger (31) to the processor (320) of the battery management system (300) via the connector (310) in response to the predetermined signal (DC1) from the AC charger (31) (S410). In some other embodiments, when the AC charger (31) is connected to the vehicle (30), the processor (320) may receive the predetermined signal (DC1) from the AC charger (31) as the wake-up signal (WK_ACC) via the connector (31) (S410). In some embodiments, the predetermined signal (DC1) may be a predetermined voltage, for example, 12 V, transmitted when the AC charger (31) is connected to the vehicle (30). In some embodiments, the analog-to-digital converter of the battery management system (300) may convert the wake-up signal (WK_ACC) output from the connector (310) into a digital wake-up signal (ADC_WK_ACC) and transmit it to the processor (320). The processor (320) may wake up the battery management system (300) in response to the wake-up signal (ADC_WK_ACC) (S420).

[0054] In some embodiments, the wake-up signal (WK_ACC) may be transmitted to the voltage supply circuit (330) to enable the voltage supply circuit (330), for example, the DC-DC converter (331). Accordingly, the voltage supply circuit (330) may supply operating voltages (Vs1, Vs2) to the internal circuits of the battery management system (300).

[0055] Next, the processor (320) can determine the connection status between the AC charger (31) and the vehicle (30) based on the connection confirmation signal (CC1) (S430). In some embodiments, when the AC charger (31) is not connected to the vehicle (30), the port transmitting the connection confirmation signal (CC1) from the connector (310) becomes floating, so the connection confirmation signal (CC1) can have a first operating voltage (Vs1) (e.g., 12 V) supplied through the voltage supply circuit (330). When the AC charger (31) is not completely connected to the vehicle (30) (semi-connected), a voltage (e.g., 9 V) obtained by dividing the first operating voltage (Vs1) by the resistance (R1) and the resistance due to the incomplete connection (semi-connection) of the AC charger (31) can be output as the connection confirmation signal (CC1). When the AC charger (31) is fully connected to the vehicle (30), a voltage (e.g., 3 V) obtained by dividing the first operating voltage (Vs1) by the resistance of the resistor (R1) and the resistance of the AC charger (31) may be output as a connection confirmation signal (CC1). Accordingly, the processor (320) may determine whether the AC charger (31) is fully connected to the vehicle (30) based on the voltage of the connection confirmation signal (CC1) (S430). In some embodiments, the analog-to-digital converter of the battery management system (300) may convert the connection confirmation signal (CC1) into a digital signal (ADC_ACCon) and transmit it to the processor (320). In some embodiments, when the voltage of the connection confirmation signal (CC1) decreases from the first operating voltage (Vs1), the processor (320) may determine that the AC charger (31) is connected to the vehicle (30) and perform a procedure for AC charging.

[0056] When the AC charger (31) is fully connected to the vehicle (30), the processor (320) can receive a PWM signal from the AC charger (31) as a control pilot signal (CP) and check the PWM signal (S440). In some embodiments, the processor (320) can determine whether the AC charger (31) is ready for charging by measuring the PWM signal (S440). In some embodiments, when the AC charger (31) is not ready for charging, the AC charger (31) does not output a PWM signal, so the processor (320) can determine whether the AC charger (31) is ready for charging by measuring whether a PWM signal is output from the AC charger (31). In some embodiments, the processor (320) can check the duty cycle and / or frequency of the PWM signal based on the PWM signal output from the contacts of the resistors (R3, R4) of the PWM control circuit (340). In some embodiments, the processor (320) can determine the voltage level of the PWM signal based on the PWM signal output from the contact point of the resistor (R6, R7) of the PWM control circuit (340).

[0057] When the AC charger (31) is ready, the processor (320) can turn on a charge control switch that controls a charging path between a battery module (e.g., 210 of FIG. 2) of the battery device and a terminal that transmits a charging current from a control device (31a) of the AC charger (31) (S450). In some embodiments, the charge control switch can be implemented as a relay. In some embodiments, the charge control switch can include a switch (e.g., 221, 222 of FIG. 2) that controls a connection between a battery module (e.g., 210 of FIG. 2) of the battery device and a link terminal (e.g., DC(+), DC(-) of FIG. 2) of the battery device. In some embodiments, the processor (320) can turn on the charge control switch by outputting a control signal (CTRL_ACC) having a predetermined level. In some embodiments, the processor (320) can perform a wake-up of the vehicle before turning on the charge control switch (S450). When the charge control switch is turned on, the battery device can perform AC charging (S460). When the charge control switch is turned on, charging current is supplied from the AC charger (31) to the battery module (210), so that the battery module (210) can be charged.

[0058] In some embodiments, the processor (320) may provide a control signal (CTRL_CP) to the PWM control circuit (340) to turn on the switch (S1) for AC charging. Then, a PWM signal having a lower voltage level than the PWM signal provided as the control pilot signal prior to AC charging may be provided to the processor (320).

[0059] FIG. 5 is a flowchart illustrating an example of a DC charging control method in a battery management system according to one embodiment.

[0060] Referring to FIGS. 3 and 5, in some embodiments, when a DC charger (32) is connected to a vehicle (30), the battery management system (300) can perform DC charging. When the DC charger (32) is connected to the vehicle (30), the processor (320) of the battery management system (300) can wake up the battery management system (300) in response to the connection of the DC charger (32) and the vehicle (30) (S510, S520).

[0061] In some embodiments, when the DC charger (32) is connected to the vehicle (30), a predetermined signal (DC2) from the DC charger (32) may be transmitted as a wake-up signal (WK_DCC) to the processor (320) of the battery management system (300) via the connector (310) (S510). In some embodiments, the predetermined signal (DC2) may be a predetermined voltage, for example, 12 V, transmitted when the DC charger (32) is connected to the vehicle (30). In some embodiments, the analog-to-digital converter of the battery management system (300) may convert the wake-up signal (WK_DCC) output from the connector (310) into a digital wake-up signal (ADC_WK_DCC) and transmit the same to the processor (320). The processor (320) may wake up the battery management system (300) in response to the wake-up signal (ADC_WK_DCC) (S520). In some embodiments, a wake-up signal (WK_DCC) may be transmitted to the voltage supply circuit (330) to enable the voltage supply circuit (330), for example, a DC-DC converter (331).

[0062] Next, the processor (320) can determine the connection status between the DC charger (32) and the vehicle (30) based on the connection confirmation signal (CC2) (S530). In some embodiments, when the DC charger (32) is not connected to the vehicle (30), the port transmitting the connection confirmation signal (CC2) from the connector (310) becomes floating, so the connection confirmation signal (CC2) can have a first operating voltage (e.g., 12 V) supplied through the voltage supply circuit (330). When the DC charger (32) is not completely connected to the vehicle (30), a voltage (e.g., 9 V) obtained by dividing the first operating voltage (Vs1) by the resistance due to the incomplete connection of the resistor (R2) and the DC charger (32) can be output as the connection confirmation signal (CC2). When the DC charger (32) is fully connected to the vehicle (30), a voltage (e.g., 3 V) obtained by dividing the first operating voltage (Vs1) by the resistance of the resistor (R2) and the DC charger (32) may be output as a connection confirmation signal (CC2). Accordingly, the processor (320) may determine whether the DC charger (32) is fully connected to the vehicle (30) based on the voltage of the connection confirmation signal (CC2) (S530). In some embodiments, the analog-to-digital converter of the battery management system (300) may convert the connection confirmation signal (CC2) into a digital signal (ADC_DCCon) and transmit it to the processor (320). In some embodiments, when the voltage of the connection confirmation signal (CC2) decreases from the first operating voltage (Vs1), the processor (320) may determine that the DC charger (32) is connected to the vehicle (30) and perform a procedure for DC charging.

[0063] Additionally, the processor (320) can communicate with the DC charger (32) (S540). In some embodiments, the processor (320) can determine whether the DC charger (32) is ready for charging through communication with the DC charger (32) (S540). In some embodiments, the battery management system (300) can further include a transceiver (350), and the processor (320) can communicate with the DC charger (32) through the transceiver (350) and the connector (310).

[0064] Additionally, the processor (320) may check the insulation status (e.g., insulation resistance status) of the battery device (S550). In some embodiments, the processor (320) may also check for abnormalities in operations defined in relation to DC charging of the battery management system (300) (S550). In some embodiments, the checking of insulation status and operation abnormalities may also be performed during AC charging.

[0065] After checking the battery device, the processor (320) may turn on a charge control switch that controls a charging path between a battery module (e.g., 210 of FIG. 2) of the battery device and a terminal that transmits a charging current from an off-board charger (32a) of the DC charger (32) (S560). In some embodiments, the charge control switch may be formed as a relay. In some embodiments, the charge control switch may include a switch that controls a connection between the off-board charger (32a) of the DC charger (32) and an external link terminal of the DC charger (32). In some embodiments, the charge control switch may include a switch (e.g., 221, 222 of FIG. 2) that controls a connection between a battery module (210) of the battery device and a link terminal (e.g., DC(+), DC(-) of FIG. 2) of the battery device. In some embodiments, the processor (320) may turn on the charge control switch by outputting a control signal (CTRL_DCC) having a predetermined level. In some embodiments, the battery management system (300) may provide a control signal to turn on a charge control switch to the DC charger (32) via a connector (310).

[0066] When the switch is turned on, the battery device can perform DC charging (S570). When the switch is turned on, a charging current is supplied from the DC charger (32) to the battery module (210), so that the battery module (210) can be charged.

[0067] As described above, the battery management system (300) can wake up based on a control signal (or first control signal) (DC1 or DC2) provided from the AC charger (31) or the DC charger (32) in response to the connection of the vehicle (30) with the AC charger (31) or the DC charger (32). In addition, the battery management system (300) can determine the connection status between the AC charger (31) or the DC charger (32) and the vehicle (30) based on the voltage of the control signal (or second control signal) (CC1) determined based on the connection between the AC charger (31) and the vehicle (30) or the voltage of the control signal (or third control signal) (CC2) determined based on the connection between the DC charger (32) and the vehicle (30), and can perform charging by selecting an AC charging mode or a DC charging mode based on the voltage of the control signal (CC1) and the voltage of the control signal (CC2).

[0068] In some embodiments, when the vehicle (30) and the AC charger (31) are not fully connected, the control signal (CC1) may be changed from a first voltage (e.g., 12 V) to a second voltage (e.g., 9 V), and when the vehicle (30) and the AC charger (31) are fully connected, the control signal (CC1) may be changed from a second voltage (e.g., 9 V) to a third voltage (e.g., 3 V). In addition, when the AC charger (31) is connected to the vehicle (30), the control signal (CC2) may maintain the first voltage. Accordingly, the battery management system (300) may determine the connection of the AC charger (31) and select an AC charging mode based on the voltage of the control signal (CC1) and the voltage of the control signal (CC2).

[0069] In some embodiments, when the vehicle (30) and the DC charger (32) are not fully connected, the control signal (CC2) may change from a first voltage (e.g., 12 V) to a second voltage (e.g., 9 V), and when the vehicle (30) and the DC charger (32) are fully connected, the control signal (CC2) may change from a second voltage (e.g., 9 V) to a third voltage (e.g., 3 V). In addition, when the DC charger (32) is connected to the vehicle (30), the control signal (CC1) may maintain the first voltage. Accordingly, the battery management system (300) may determine the connection of the DC charger (31) and select a DC charging mode based on the voltage of the control signal (CC1) and the voltage of the control signal (CC2).

[0070] In some embodiments, a charging control method of a battery management system (300) may include a step of receiving a predetermined voltage (DC1 or DC2) in response to a connection between a vehicle (30) and a charger (31 or 32), a step of waking up in response to the predetermined voltage, a step of selecting an AC charging mode or a DC charging mode based on a voltage of a control signal (CC1 and / or CC2) determined based on the connection between the charger (31 or 32) and the vehicle (30), and a step of determining a connection state between the charger (31 or 32) and the vehicle (30) based on the voltage of the control signal (CC1 and / or CC2).

[0071] FIG. 6 is a diagram showing an example of operation timing for AC charging of a battery management system according to one embodiment, and FIG. 7 is a diagram showing an example of operation timing for DC charging of a battery management system according to one embodiment.

[0072] Referring to FIG. 6, when an AC charger is connected to a vehicle, a wake-up signal (WKUP) transmitted to a processor of a battery management system may be changed to a predetermined voltage (e.g., a high level). Accordingly, the battery management system may wake up from a sleep state. In some embodiments, the processor may check whether the charge control switch is operating normally for charging. For example, the processor may temporarily turn on the charge control switch. The connection confirmation signals (CC1, CC2) and the control pilot signal (CP) provided to the processor by supplying an operating voltage by the wake-up of the battery management system may also be changed to an operating voltage (e.g., 12 V). Depending on the connection between the AC charger and the vehicle, the connection confirmation signal (CC1) may change from the operating voltage (e.g., 12 V) to a first predetermined voltage (e.g., 9 V) lower than the operating voltage, and depending on the complete connection between the AC charger and the vehicle, the connection confirmation signal (CC1) may change from the first predetermined voltage (9 V) to a second predetermined voltage (e.g., 3 V) lower than the first predetermined voltage.

[0073] The processor can determine that the AC charger and the vehicle are fully connected by detecting the voltage of the connection confirmation signal (CC1) as a second predetermined voltage. In this case, since the AC charger is connected, the connection confirmation signal (CC2) for the DC charger can maintain the operating voltage (12 V). Therefore, the processor can determine to proceed with the AC charging mode among the AC charging mode and the DC charging mode based on the voltage of the connection confirmation signals (CC1, CC2). In addition, when the AC charger and the vehicle are fully connected, a PWM signal can be provided from the AC charger to the processor of the battery management system as a CP signal. The CP signal can have, for example, the operating voltage (12 V) as a voltage level. The processor can determine that the AC charging is ready by measuring the CP signal. In some embodiments, the processor can check the communication status between the AC charger and the battery management system and / or whether there is an abnormality in the defined operation related to charging before proceeding with the AC charging.

[0074] The processor may turn on the charge control switch for AC charging to supply the charging current of the AC charger to the battery module of the battery device. In some embodiments, the processor may provide a CP control signal (PWM control signal) having a predetermined voltage (e.g., a high level) to the PWM control circuit to lower the voltage level of the CP signal provided from the AC charger (e.g., lower the voltage level of the CP signal to 6 V).

[0075] The processor may terminate the charging process after completing AC charging. To terminate the charging process, the processor may turn off the charge control switch. In some embodiments, the processor may block the CP control signal (e.g., change the CP control signal to a low level) to increase the voltage level of the CP signal. Upon completion of the AC charging, the AC charger may be disconnected from the vehicle, and the connection confirmation signal (CC1) may increase from 3 V to 9 V, and then from 9 V to 12 V. Upon complete disconnection of the AC charger, the battery management system may enter a sleep state, and the connection confirmation signals (CC1, CC2) and the CP signal may change to 0 V.

[0076] Referring to FIG. 7, when a DC charger is connected to a vehicle, a wake-up signal (WKUP) transmitted to the processor of the battery management system may be changed to a predetermined voltage (e.g., a high level). Accordingly, the battery management system may wake up from a sleep state. In some embodiments, the processor may check whether the charge control switch is operating normally for charging. For example, the processor may temporarily turn on the charge control switch. The connection confirmation signals (CC1, CC2) provided to the processor by supplying an operating voltage by the wake-up of the battery management system may also be changed to an operating voltage (e.g., 12 V). Depending on the connection between the DC charger and the vehicle, the connection confirmation signal (CC2) may be changed from the operating voltage (e.g., 12 V) to a first predetermined voltage (e.g., 9 V) lower than the operating voltage, and depending on the complete connection between the DC charger and the vehicle, the connection confirmation signal (CC1) may be changed from the first predetermined voltage (9 V) to a second predetermined voltage (e.g., 3 V) lower than the first predetermined voltage.

[0077] The processor can determine that the DC charger and the vehicle are fully connected by detecting the voltage of the connection confirmation signal (CC2) as a second predetermined voltage. In this case, since the DC charger is connected, the connection confirmation signal (CC1) for the AC charger can maintain the operating voltage (12 V). Accordingly, the processor can determine to proceed with the DC charging mode among the AC charging mode and the DC charging mode based on the voltage of the connection confirmation signals (CC1, CC2). In some embodiments, the processor can check the insulation status of the battery device. In this case, the processor can check the insulation status by periodically repeating on / off of the switch of the insulation circuit. In some embodiments, the processor can check the communication status between the DC charger and the battery management system and / or whether there is an abnormality in the operation defined in relation to charging before proceeding with the DC charging.

[0078] The processor can turn on the charge control switch for DC charging, thereby supplying the charging current of the DC charger to the battery module of the battery device. In some embodiments, the processor can set the on / off cycle (measurement cycle) of the switch to be shorter than the on / off cycle (measurement cycle) of the switch before charging, to reliably check the insulation condition during charging.

[0079] After completing the DC charging, the processor may terminate the charging process. To terminate the charging process, the processor may turn off the charge control switch. In some embodiments, the processor may re-establish a longer on / off cycle for the switch of the isolation circuit. Upon completion of the DC charging, the DC charger may be disconnected from the vehicle, and the connection confirmation signal (CC2) may increase from 3 V to 9 V and then from 9 V to 12 V. Upon complete disconnection of the DC charger, the battery management system may enter a sleep state, and the connection confirmation signals (CC1, CC2) may change to 0 V.

[0080] FIG. 8 is a drawing showing an example of a battery device according to one embodiment, and FIGS. 9 and 10 are drawings each explaining an example of insulation resistance measurement in a battery device according to one embodiment.

[0081] Referring to FIG. 8, the battery device (800) may include a battery module (810), switches (821, 822), and an insulation resistance measurement circuit (830).

[0082] In some embodiments, the insulation resistance measurement circuit (830) may include a resistor (R11), a switch (SW1), and a resistor (R12) connected in series between a positive terminal and a ground terminal of the battery module (810), and a direct current voltage source (Vdc), a resistor (R13), a switch (SW2), and a resistor (R14) connected in series between the ground terminal and the negative terminal of the battery module (810). The ground terminal may be, for example, a chassis of a vehicle. The insulation resistance measurement circuit (830) may have a first insulation resistance measurement terminal (IR1) on a path formed by the resistors (R11, R12) and the switch (SW1). When the switch (SW1) is turned on, a voltage divided by the resistors (R11, R12) may be measured at the first insulation resistance measurement terminal (IR1). For example, a contact point of the resistors (R11, R12) may be set as the first insulation resistance measurement terminal (IR1). The insulation resistance measurement circuit (830) may have a second insulation resistance measurement terminal (IR2) on a path formed by resistors (R13, R14) and a switch (SW2). When the switch (SW2) is turned on, a voltage divided by resistors (R13, R14) may be measured at the second insulation resistance measurement terminal (IR2). For example, the contact points of resistors (R13, R14) may be set as the second insulation resistance measurement terminal (IR2). In some embodiments, since the resistors (R13, R14) are connected between the negative terminal and the ground terminal of the battery module (810), a direct current voltage source (Vdc) may be provided so that the voltage of the second insulation resistance measurement terminal (IR2) may become a positive voltage.

[0083] In some embodiments, the insulation resistance measurement circuit (830) may be formed in an area of ​​the battery management system.

[0084] In some embodiments, an insulation resistance (R21) of the battery device (800) is formed between the positive terminal and the ground terminal of the battery module (810), and an insulation resistance (R22) of the battery device (800) is formed between the negative terminal and the ground terminal of the battery module (810). - ) can be formed. In addition, an insulation resistance (R31) of the vehicle can be formed between the positive link terminal (DC(+)) of the battery module (810) and the ground terminal, and an insulation resistance (R32) of the vehicle can be formed between the negative link terminal (DC(-)) of the battery module (810) and the ground terminal.

[0085] A processor (not shown) of the battery device (800) controls the operation of the switches (SW1, SW2) and can measure the insulation resistances (R21, R22) based on the voltage of the battery module (810), the voltage of the first insulation resistance measurement terminal (IR1), and the voltage of the second insulation resistance measurement terminal (IR2). In some embodiments, the battery device (800) can convert the voltages of the first and second insulation resistance measurement terminals (IR1, IR2) into digital signals and transmit the digital signals to the processor.

[0086] Referring to FIGS. 8 and 9, in a charging connection step in which a charger is connected and / or a charging preparation step in which the charger is ready to charge, the processor can measure the insulation resistance of the battery device (800) in a first measurement cycle (T1).

[0087] The processor can turn off the switch (SW2) and turn on the switch (SW1) for a portion of the first measurement cycle (T1) (e.g., a portion corresponding to the first half of the first measurement cycle) (T11). By turning on the switch (SW1), a current path through the resistors (R11, R12) can be formed between the positive terminal of the battery module (810) and the ground terminal. Since the insulation resistor (R21) is formed between the positive terminal of the battery module (810) and the ground terminal, a circuit in which a set of resistors (R11, R12) and the insulation resistor (R21) are connected in parallel can be formed between the positive terminal of the battery module (810) and the ground terminal. In addition, a circuit in which the insulation resistor (R22) is connected between the ground terminal and the negative terminal of the battery module (810) can be formed. In this state, the processor can detect the voltage of the first insulation resistance measurement terminal (IR1).

[0088] Next, the processor can turn off the switch (SW1) and turn on the switch (SW2) for a portion of the first measurement cycle (T1) (e.g., a portion corresponding to the latter half of the first measurement cycle) (T12). By turning on the switch (SW2), a current path through a voltage source (Vdc) and resistors (R13, R14) can be formed between the ground terminal and the negative terminal of the battery module (810). Since an insulation resistor (R22) is formed between the ground terminal and the negative terminal of the battery module (810), a circuit in which a set of resistors (R13, R14) and the insulation resistor (R22) are connected in parallel between the ground terminal and the negative terminal of the battery module (810) can be formed. In addition, a circuit in which an insulation resistor (R21) is connected between the positive terminal of the battery module (810) and the ground terminal can be formed. In this state, the processor can detect the voltage of the second insulation resistance measurement terminal (IR2).

[0089] The processor can measure the resistance values ​​of the insulation resistors (R21, R22) based on the voltage of the first insulation resistance measurement terminal (IR1), the voltage of the second insulation resistance measurement terminal (IR2), the voltage of the battery module (810), and the resistance values ​​of the resistors (R11, R12, R13, R14). The processor can measure the resistance values ​​of the insulation resistors (R21, R22) by repeating the first measurement cycle (T1), and check whether the insulation resistors (R21, R22) are broken based on the resistance values ​​of the insulation resistors (R21, R22) measured in each first measurement cycle (T1) or by comparing the resistance values ​​of the insulation resistors (R21, R22) measured in each first measurement cycle (T1).

[0090] Referring to FIGS. 8 and 10, in the charging stage where charging has started, the processor can measure the insulation resistance of the battery device (800) with a second measurement cycle (T2) that is shorter than the first measurement cycle (T1).

[0091] The processor can detect the voltage of the first insulation resistance measurement terminal (IR1) after turning off the switch (SW2) and turning on the switch (SW1) for a portion of the second measurement period (T2) (e.g., a portion corresponding to the first half of the second measurement period) (T21). Next, the processor can detect the voltage of the second insulation resistance measurement terminal (IR2) after turning off the switch (SW1) and turning on the switch (SW2) for a portion of the second measurement period (T2) (e.g., a portion corresponding to the second half of the second measurement period) (T22).

[0092] The processor can measure the resistance values ​​of the insulation resistors (R21, R22) based on the voltage of the first insulation resistance measurement terminal (IR1), the voltage of the second insulation resistance measurement terminal (IR2), the voltage of the battery module (810), and the resistance values ​​of the resistors (R11, R12, R13, R14). The processor can measure the resistance values ​​of the insulation resistors (R21, R22) by repeating the second measurement cycle (T2), and check whether the insulation resistors (R21, R22) are broken based on the resistance values ​​of the insulation resistors (R21, R22) measured in each second measurement cycle (T2) or by comparing the resistance values ​​of the insulation resistors (R21, R22) measured in each second measurement cycle (T2).

[0093] In this way, the processor can reliably check whether the insulation resistance is destroyed during charging of the battery module by setting the insulation resistance measurement cycle during charging of the battery module to be shorter than the insulation resistance measurement cycle before charging of the battery module.

[0094] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

1. As a battery device installed in a vehicle, battery module, and A battery management system that wakes up based on a first control signal provided from the AC charger or the DC charger in response to the connection of the vehicle with the AC (alternate current) charger or the DC (direct current) charger, determines a connection state between the AC charger or the DC charger and the vehicle based on a voltage of a second control signal determined based on a connection between the AC charger and the vehicle or a voltage of a third control signal determined based on a connection between the DC charger and the vehicle, and performs charging by selecting an AC charging mode or a DC charging mode based on the voltage of the second control signal and the voltage of the third control signal. A battery device comprising:

2. In paragraph 1, In a state where the vehicle and the AC charger are not fully connected, the second control signal changes from the first voltage to the second voltage, and in a state where the vehicle and the AC charger are fully connected, the second control signal changes from the second voltage to the third voltage. When the AC charger is connected to the vehicle, the third control signal maintains the first voltage. Battery device.

3. In paragraph 2, A battery device, wherein the battery management system receives the first control signal from the AC charger via an onboard charger mounted on the vehicle.

4. In paragraph 2, A battery device wherein the battery management system measures a pulse width modulation signal provided from the AC charger to determine whether the AC charger is ready for charging.

5. In paragraph 4, A battery device wherein the battery management system outputs a fourth control signal during AC charging to control the voltage level of the pulse width modulation signal.

6. In paragraph 1, In a state where the vehicle and the DC charger are not fully connected, the third control signal changes from the first voltage to the second voltage, and in a state where the vehicle and the DC charger are fully connected, the third control signal changes from the second voltage to the third voltage. When the DC charger is connected to the vehicle, the second control signal maintains the first voltage. Battery device.

7. In paragraph 6, A battery device, wherein the battery management system communicates with the DC charger before proceeding with the DC charging.

8. In paragraph 6, A battery device wherein the battery management system checks the insulation status of the battery device before proceeding with the DC charging.

9. In paragraph 8, The above battery management system After connecting the DC charger and the vehicle, and before charging the battery module, the insulation resistance is measured in the first measurement cycle, Measuring the insulation resistance with a second measurement cycle shorter than the first measurement cycle during charging of the battery module. Battery device.

10. In paragraph 6, A battery device, wherein the battery management system provides a control signal to control a switch to the DC charger for DC charging.

11. In paragraph 6, A battery device, wherein the battery management system checks the operation of the battery device before proceeding with the DC charging.

12. As a battery management system for a battery device mounted on a vehicle, A connector connected to an AC charger or a DC charger and receiving a first control signal provided from the AC charger or the DC charger in response to the connection of the AC charger or the DC charger; A first control circuit connected to the connector, determining a voltage of a second control signal based on a connection between the AC charger and the vehicle, and determining a voltage of a third control signal based on a connection between the DC charger and the vehicle; and A processor that wakes up the battery management system in response to the first control signal of the connector, determines a connection state between the AC charger or the DC charger and the vehicle based on the voltage of the second control signal or the voltage of the third control signal, and performs charging by selecting an AC charging mode or a DC charging mode based on the voltage of the second control signal and the voltage of the third control signal. A battery management system including:

13. In paragraph 12, A battery management system, wherein the processor selects the AC charging mode when the voltage of the second control signal changes and the voltage of the third control signal is maintained.

14. In paragraph 12, A battery management system, wherein the processor selects the DC charging mode when the voltage of the third control signal changes and the voltage of the second control signal is maintained.

15. In paragraph 12, The above first control circuit A first resistor connected between the first output port from which the second control signal is output from the connector and the line supplying the operating voltage, and A second resistor connected between the second output port from which the third control signal is output from the connector and the line supplying the operating voltage. A battery management system including:

16. In paragraph 12, It further includes a second control circuit, The above connector receives a pulse width modulation signal provided from the above AC charger, The second control circuit includes a first resistor and a second resistor connected in series between the output port from which the pulse width modulation signal is output from the connector and the ground terminal, The processor measures the pulse width modulation signal based on the voltage at the contact point of the first resistor and the second resistor to determine whether the AC charger is ready for charging. Battery management system.

17. In paragraph 16, The second control circuit further includes a switch and a third resistor connected in series between the output port and the ground terminal, The above processor turns on the switch while performing AC charging through the above AC charger. Battery management system.

18. In paragraph 12, The above processor After connecting the DC charger and the vehicle, the insulation resistance is measured in the first measurement cycle before performing DC charging, While performing the above DC charging, the insulation resistance is measured with a second measurement cycle that is shorter than the first measurement cycle. Battery management system.

19. A charging control method of a battery management system, A step of receiving a predetermined voltage in response to the connection of a vehicle equipped with the above battery management system and a charger, A step of waking up in response to the above predetermined voltage, A step of selecting an AC charging mode or a DC charging mode based on the voltage of a control signal determined based on the connection between the charger and the vehicle, and A step of determining the connection status between the charger and the vehicle based on the voltage of the control signal. A charging control method comprising:

20. In paragraph 19, The above control signal is A first control signal for changing the voltage when the AC charger is connected to the vehicle as the above charger, and A second control signal for changing the voltage when a DC charger is connected to the vehicle as the above charger. A charging control method comprising:

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