Battery charging apparatus and method for vehicle

Abstract

The present invention relates to a battery charging device and method for a vehicle, and aims to enable the vehicle to respond to multiple external chargers with different charging voltages without using a separate boost converter. To this end, the vehicle charging device according to the present invention comprises: a third switching means provided between a first battery and a second battery to electrically connect or disconnect the first battery and the second battery; a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery; a second switching means provided to supply or cut off a charging current supplied from the outside to the second battery; and a control unit provided to control the on / off of the first switching means, the second switching means, and the third switching means in order to selectively charge each or all of the first battery and the second battery.

Description

Technology Field

[0001] The present invention relates to a vehicle, and more specifically to an apparatus and method for charging a vehicle battery. Background Technology

[0002] As the development of eco-friendly vehicles (such as electric or hybrid vehicles) accelerates, the driving range of these vehicles is also increasing.

[0003] Battery capacity has also increased significantly to enable driving of hundreds of kilometers or more on a single full charge. To charge these increased-capacity batteries in a shorter time, there is a trend toward developing battery voltages ranging from 400V to 800V. However, most fast chargers currently in use only support 400V batteries and often fail to support 800V batteries. Although the adoption of 800V fast chargers is on the rise, 400V fast chargers still make up the majority.

[0004] For this reason, eco-friendly vehicles equipped with 800V batteries must be able to be charged using both 400V and 800V fast chargers. To achieve this, the voltage of a 400V charger is typically stepped up inside the vehicle to charge the 800V battery.

[0005] In order to boost the voltage of a 400V charger inside the vehicle, a boost converter must be installed, but in this case, noise may occur during the boosting process. The noise generated during the boosting process can cause charging failures. Additionally, installing a filter to block noise can lead to an increase in the price of the vehicle. The problem to be solved

[0006] According to one aspect of the present invention, the purpose is to enable a vehicle to support multiple external chargers with different charging voltages without using a separate boost converter. means of solving the problem

[0007] A vehicle charging device according to the present invention for the purpose described above comprises: a third switching means arranged between a first battery and a second battery to electrically connect or disconnect the first battery and the second battery; a first switching means arranged to supply or cut off a charging current supplied from the outside to the first battery; a second switching means arranged to supply or cut off a charging current supplied from the outside to the second battery; and a control unit arranged to control the on / off of the first switching means, the second switching means, and the third switching means in order to selectively charge each or all of the first battery and the second battery.

[0008] In the vehicle charging device described above, the control unit variably adjusts the magnitude of the charging current supplied to each of the first battery and the second battery so that the charging amounts of the first battery and the second battery become equal to each other.

[0009] In the vehicle charging device described above, the first switching means includes a first transistor for controlling the supply amount of the charging current; and the second switching means includes a second transistor for controlling the supply amount of the charging current.

[0010] In the vehicle charging device described above, the first switching means further includes a first relay for controlling the supply or interruption of the charging current; and the second switching means further includes a second relay for controlling the supply or interruption of the charging current.

[0011] In the vehicle charging device described above, the control unit turns on the third switching means and turns off the first switching means and the second switching means so that the first battery and the second battery are charged as a single battery.

[0012] In the vehicle charging device described above, the control unit turns off the third switching means and turns on the first switching means and the second switching means so that the first battery and the second battery are each charged independently.

[0013] In the vehicle charging device described above, the control unit turns off the third switching means, turns on one of the first switching means and the second switching means, and turns off the other, so that only one of the first battery and the second battery is charged exclusively.

[0014] In the vehicle charging device described above, the control unit controls the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of the external charger supplying the charging current.

[0015] A control method for a vehicle charging device according to the present invention for the purpose described above comprises: a third switching means arranged between a first battery and a second battery to electrically connect or disconnect the first battery and the second battery; a first switching means arranged to supply or cut off a charging current supplied from the outside to the first battery; and a second switching means arranged to supply or cut off a charging current supplied from the outside to the second battery, the control method for a vehicle charging device comprising: a step of checking the charging capacity of an external charger supplying the charging current; and a step of controlling the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of the external charger.

[0016] In the control method of the vehicle charging device described above, the magnitude of the charging current supplied to each of the first battery and the second battery is variably adjusted so that the charging amounts of the first battery and the second battery become equal to each other.

[0017] In the control method of the vehicle charging device described above, the first switching means includes a first transistor for controlling the supply amount of the charging current; and the second switching means includes a second transistor for controlling the supply amount of the charging current.

[0018] In the control method of the vehicle charging device described above, the first switching means further includes a first relay for controlling the supply or interruption of the charging current; and the second switching means further includes a second relay for controlling the supply or interruption of the charging current.

[0019] In the control method of the vehicle charging device described above, the third switching means is turned on, and the first switching means and the second switching means are turned off so that the first battery and the second battery are controlled to be charged as a single battery.

[0020] In the control method of the vehicle charging device described above, the third switching means is turned off, and the first switching means and the second switching means are turned on so that the first battery and the second battery are each controlled to be charged independently.

[0021] In the control method of the vehicle charging device described above, the third switching means is turned off, and either one of the first switching means or the second switching means is turned on and the other is turned off, so that only one of the first battery or the second battery is charged exclusively.

[0022] A vehicle according to the present invention for the purpose described above comprises: a first battery and a second battery; a third switching means provided between the first battery and the second battery and configured to electrically connect or disconnect the first battery and the second battery; a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery; a second switching means provided to supply or cut off a charging current supplied from the outside to the second battery; and a control unit provided to control the on / off of the first switching means, the second switching means, and the third switching means in order to selectively charge each or all of the first battery and the second battery.

[0023] A vehicle control method according to the present invention for the purpose described above comprises: a first battery and a second battery; a third switching means provided between the first battery and the second battery and configured to electrically connect or disconnect the first battery and the second battery; a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery; and a second switching means provided to supply or cut off a charging current supplied from the outside to the second battery, the method comprising: a step of checking the charging capacity of an external charger supplying the charging current; and a step of controlling the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of the external charger. Effects of the invention

[0024] According to one aspect of the present invention, the purpose is to enable a vehicle to support multiple external chargers with different charging voltages without using a separate boost converter. Brief explanation of the drawing

[0025] FIG. 1 is a drawing showing a vehicle charging device according to one embodiment of the present invention. FIG. 2 is a diagram showing charging control for a 400V class external fast charger in a vehicle charging device according to an embodiment of the present invention. FIG. 3 is a diagram showing charging control for a vehicle charging device according to an embodiment of the present invention to correspond to an 800V external fast charger. FIG. 4 is a diagram showing a vehicle charging method according to an embodiment of the present invention. Specific details for implementing the invention

[0026] FIG. 1 is a drawing showing a vehicle charging device according to one embodiment of the present invention.

[0027] In FIG. 1, reference numeral 102 is an external fast charger provided on the exterior of a vehicle. By plugging in a charging cable, the external fast charger (102) is electrically connected to a vehicle charging device according to an embodiment of the present invention through a high-voltage relay assembly (120). The high-voltage relay assembly (120) includes two high-voltage relays (RL4) (RL5) connected to the (+) terminal and (-) terminal, respectively, of the external fast charger (102), and a current sensor (110) for detecting the magnitude of the current flowing through the (+) terminal. When the external fast charger (102) and the vehicle charger according to an embodiment of the present invention are connected by plugging in a charging cable, the two high-voltage relays (RL4) (RL5) of the high-voltage relay assembly (102) are turned on so that current can be supplied.

[0028] A vehicle charging device according to an embodiment of the present invention is configured to charge a high-voltage battery (104) (106) provided in a vehicle. The high-voltage battery (104) (106) shown in FIG. 1 consists of two 400V class high-voltage batteries (104) (106). A third high-voltage relay (RL3), which is a third switching means, is provided between the two 400V class high-voltage batteries (104) (106), that is, between the first high-voltage battery (104) and the second high-voltage battery (106). Thus, when the third high-voltage relay (RL3) is turned off, the two 400V class high-voltage batteries (104) (106) are electrically separated from each other and operate as separate 400V class batteries. Conversely, when the third high-voltage relay (RL3) is turned on, the two 400V high-voltage batteries (104) (106) are electrically connected to each other and operate as 800V batteries.

[0029] The first high-voltage battery (104) can be charged independently through the first high-voltage relay (RL1) and the first transistor (IGBT1) constituting the first switching means. That is, when the third high-voltage relay (RL3), the second high-voltage relay (RL2), and the second transistor (IGBT2) are turned off, the first high-voltage relay (RL1) and the first transistor (IGBT1) are turned on, and the first high-voltage battery (104) is charged independently. The first switching means may be composed of a combination of the first high-voltage relay (RL1) and the first transistor (IGBT1), or may be composed of the first transistor (IGBT1) alone.

[0030] The second high-voltage battery (106) can also be charged independently through the second high-voltage relay (RL2) and the second transistor (IGBT2) that constitute the second switching means. That is, when the third high-voltage relay (RL3), the first high-voltage relay (RL1), and the first transistor (IGBT1) are turned off, the second high-voltage relay (RL2) and the second transistor (IGBT2) are turned on, and the second high-voltage battery (106) is charged independently. The second switching means may be composed of a combination of the second high-voltage relay (RL2) and the second transistor (IGBT2), or may be composed of the second transistor (IGBT2) alone.

[0031] If the third high-voltage relay (RL3) is turned off and the first high-voltage relay (RL1), the first transistor (IGBT1), the second high-voltage relay (RL2), and the second transistor (IGBT2) are turned on, both the first high-voltage battery (104) and the second high-voltage battery (106) can be charged independently.

[0032] When the first high-voltage relay (RL1), the first transistor (IGBT1), the second high-voltage relay (RL2), and the second transistor (IGBT2) are turned off, and only the third high-voltage relay (RL3) is turned on, the first high-voltage battery (104) and the second high-voltage battery (106) are electrically connected in series and can be charged as a single 800V battery.

[0033] The first transistor (IGBT1) and the second transistor (IGBT2) are Insulated Gate Bipolar Transistors (IGBTs) that serve as high-power switches. The first transistor (IGBT1) is controlled by a gate voltage (V1) supplied through a regulator (114) under the control of a battery management system (112) that operates as a control unit. The second transistor (IGBT2) is also controlled by a gate voltage (V2) supplied through another regulator (116) under the control of the battery management system (112).

[0034] The operating regions of the first transistor (IGBT1) and the second transistor (IGBT2), respectively, can be divided into a linear region, a saturation region, and a cutoff region. In an embodiment of the present invention, the first transistor (IGBT1) and the second transistor (IGBT2) are each operated in the saturation region and the cutoff region through the magnitude of the gate voltage (V1) (V2) to simply perform the role of an on / off switch, or the magnitude of the current flowing through the first transistor (IGBT1) and the second transistor (IGBT2) is controlled by operating the first transistor (IGBT1) and the second transistor (IGBT2) each in the linear region. The adjustment of the magnitude of the current through each of the first transistor (IGBT1) and the second transistor (IGBT2) is intended to charge the first high-voltage battery (104) and the second high-voltage battery (106) equally by controlling the magnitude of the current flowing to the first high-voltage battery (104) and the second high-voltage battery (106) equally.

[0035] In FIG. 1, a current sensor (110) measures the magnitude of the charging current (Icharge) supplied through the (+) terminal of an external fast charger (102). Another current sensor (108) measures the magnitude of the current flowing through the current path between the first high-voltage relay (RL1) and the (+) electrode of the second high-voltage battery (106) (see I2 in FIG. 2 and FIG. 3).

[0036] A vehicle charging device according to an embodiment of the present invention enables an 800V high-voltage battery (104)(106) to be charged independently as two 400V high-voltage batteries (104)(106). Most external fast chargers currently in use are 400V models, and there is a growing trend of increasing adoption of 800V external fast chargers for faster charging. A vehicle charging device according to an embodiment of the present invention enables an 800V high-voltage battery (104)(106) to be charged independently as two 400V high-voltage batteries (104)(106) in order to be compatible with both 400V external fast chargers and 800V external fast chargers.

[0037] In a vehicle according to an embodiment of the present invention, a change in the charging method according to the capacity of an external rapid charger (102) is to be explained in detail through FIGS. 2 to 4.

[0038] FIG. 2 is a diagram showing charging control for a 400V class external fast charger in a vehicle charging device according to an embodiment of the present invention.

[0039] The external fast charger (102) shown in FIG. 2 is a 400V class model. In this case, the vehicle charging device according to the embodiment of the present invention electrically divides the 800V class high-voltage battery (104)(106) into two 400V class high-voltage batteries (104)(106) and performs independent charging for the two 400V class high-voltage batteries (104)(106).

[0040] As shown in FIG. 2, with the third high-voltage relay (RL3) turned off, the first high-voltage relay (RL1), the first transistor (IGBT1), the second high-voltage relay (RL2), and the second transistor (IGBT2) are turned on. Through this control, the first high-voltage battery (104) and the second high-voltage battery (106) are each independently charged as 400V class batteries.

[0041] Charging of the first high-voltage battery (104) and the second high-voltage battery (106) is performed by a charging current (Icharge) supplied from an external fast charger (102). In the case of FIG. 2, the charging current (Icharge) is divided and supplied to the first high-voltage battery (104) and the second high-voltage battery (106). Ideally, the first current (I1) supplied to the first high-voltage battery (104) and the second current (I2) supplied to the second high-voltage battery (106) should be the same, but for reasons such as the physical characteristics of the current path, the first current (I1) and the second current (I2) may not be the same. If the first current (I1) supplied to the first high-voltage battery (104) and the second current (I2) supplied to the second high-voltage battery (106) are not the same, an imbalance may occur between the battery cells of the first high-voltage battery (104) and the second high-voltage battery (106).

[0042] Accordingly, in a vehicle charging device according to an embodiment of the present invention, the magnitude of the current flowing through each of the first transistor (IGBT1) and the second transistor (IGBT2) is controlled by adjusting the gate voltages (V1) and (V2) of each of the first transistor (IGBT1) and the second transistor (IGBT2), thereby controlling the first current (I1) supplied to the first high-voltage battery (104) and the second current (I2) supplied to the second high-voltage battery (106) to be equal. At this time, each of the gate voltages (V1) and (V2) is greater than 0V to turn on the first transistor (IGBT1) and the second transistor (IGBT2). However, in order to adjust each of the first current (I1) and the second current (I2) to be of the same magnitude (I1=I2), each of the gate voltages (V1) and (V2) may be different voltage levels greater than 0V. If I1 > I2, I1 can be made equal to I2 by adjusting the magnitudes of the gate voltages (V1)(V2) so that V1 < V2. Conversely, if I1 < I2, I1 can be made equal to I2 by adjusting the magnitudes of the gate voltages (V1)(V2) so that V1 > V2.

[0043] The relationship between the charging current (Icharge), the first current (I1), and the second current (I2) can be expressed as Icharge = I1 + I2. From this, it can be seen that the second current (I2) is I2 = Icharge - I1. Therefore, the magnitudes of the charging current (Icharge), the first current (I1), and the second current (I2) can all be measured using only two current sensors (108) (110).

[0044] FIG. 3 is a diagram showing charging control for a vehicle charging device according to an embodiment of the present invention to correspond to an 800V external fast charger.

[0045] The external fast charger (102) shown in FIG. 3 is an 800V class model. In this case, the vehicle charging device according to the embodiment of the present invention performs charging as a single 800V class high-voltage battery (104)(106) without dividing the 800V class high-voltage battery (104)(106).

[0046] As shown in FIG. 3, when the first high-voltage relay (RL1), the first transistor (IGBT1), the second high-voltage relay (RL2), and the second transistor (IGBT2) are turned off, and only the third high-voltage relay (RL3) is turned on, the first high-voltage battery (104) and the second high-voltage battery (106) are electrically connected in series and can be charged as a single 800V-class battery.

[0047] Since both the first transistor (IGBT1) and the second transistor (IGBT2) are turned off, current control through adjustment of the gate voltages (V1) and (V2) is not required. Therefore, the gate voltages (V1) and (V2) at this time are both 0V. In addition, the charging current (Icharge) supplied from the external high-speed charger (102) is supplied sequentially to the second high-voltage battery (106) and the first high-voltage battery (104) to charge the first high-voltage battery (104) and the second high-voltage battery (106).

[0048] If, when charging the high-voltage batteries (104) (106) in the manner shown in FIG. 3 in response to an 800V external rapid charger (102), a charging imbalance between the first high-voltage battery (104) and the second high-voltage battery (106) is detected, the charging imbalance between the first high-voltage battery (104) and the second high-voltage battery (106) can be resolved by turning on only the first high-voltage relay (RL1) and the first transistor (IGBT1) to charge only the first battery (104) alone, or conversely, turning on only the second high-voltage relay (RL2) and the second transistor (IGBT2) to charge only the second battery (106) alone, as previously mentioned in the description of FIG. 1.

[0049] FIG. 4 is a diagram showing a vehicle charging method according to an embodiment of the present invention.

[0050] The battery management system (112) checks whether the external fast charger (102) is electrically connected to the vehicle by plugging in (402).

[0051] When the external fast charger (102) is electrically connected to the vehicle by plugging in, the battery management system (112) checks whether the charging voltage of the external fast charger (102) is 400V or 800V (404).

[0052] When it is confirmed that the charging voltage of the external fast charger (102) is 400V, the battery management system (112) starts charging so that the first high-voltage battery (104) and the second high-voltage battery (106) are each independently charged as 400V class batteries through the following switching control (412). That is, in this case, the battery management system (112) turns on the first high-voltage relay (RL1) and the second high-voltage relay (RL2) and turns off the third high-voltage relay (RL3), as previously explained through FIG. 2, and sets the gate voltages (V1) and (V2) to values ​​greater than 0V, thereby allowing the first high-voltage battery (104) and the second high-voltage battery (106) to each be independently charged as 400V class batteries.

[0053] If the first current (I1) for charging the first high-voltage battery (104) and the second current (I2) for charging the second high-voltage battery (106) are the same ('Yes' in 414), the battery management system (112) continues to maintain the gate voltages (V1) and (V2) each at a value greater than 0V, thereby allowing independent charging of the first high-voltage battery (104) and the second high-voltage battery (106) to continue (416).

[0054] If the first current (I1) for charging the first high-voltage battery (104) and the second current (I2) for charging the second high-voltage battery (106) are not the same ('No' in 414), the battery management system (112) adjusts (variably) each of the gate voltages (V1) and (V2) to a specific value greater than 0V so that the magnitudes of the first current (I1) and the second current (I2) become the same. By adjusting (variably) the first current (I1) and the second current (I2) in this way, uniform charging of the first high-voltage battery (104) and the second high-voltage battery (106) is achieved (418).

[0055] In step 404, when it is confirmed that the charging voltage of the external fast charger (102) is 800V, the battery management system (112) starts charging as a single 800V high-voltage battery (104)(106) without splitting the 800V high-voltage battery (104)(106) through the following switching control (422). That is, in this case, the battery management system (112) turns off the first high-voltage relay (RL1) and the second high-voltage relay (RL2) and turns on the third high-voltage relay (RL3), as previously explained through FIG. 3, and maintains the gate voltages (V1)(V2) respectively at 0V, thereby turning off both the first transistor (IGBT1) and the second transistor (IGBT2) (422).

[0056] When the desired charging of the high-voltage battery (104)(106) is completed through such charging ('Yes' of 430), the battery management system (112) completes the charging of the high-voltage battery (104)(106).

[0057] The above description is merely an illustrative explanation of the technical concept, and those skilled in the art will be able to make various modifications, changes, and substitutions within the scope of the essential characteristics without departing from the nature of the invention. Accordingly, the embodiments disclosed above and the attached drawings are intended to explain, not limit, the technical concept, and the scope of the technical concept is not limited by such embodiments and attached drawings. The scope of protection shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights. Explanation of the symbols

[0058] 102 : External fast charger 104: 1st High-Voltage Battery 106: Second high-voltage battery 108, 110: Current sensors 112: Battery Management System 114 : Regulator 116 : Regulator 120: High-voltage relay assembly RL1, RL2, RL3, RL4, RL5: High-voltage relays IGBT1, IGBT2: Transistors

Claims

Claim 1 A third switching means provided between a first battery and a second battery and configured to electrically connect or disconnect the first battery and the second battery; a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery and including a first transistor for controlling the amount of the supply of the charging current; a second switching means provided to supply or cut off a charging current supplied from the outside to the second battery and including a second transistor for controlling the amount of the supply of the charging current; and a control unit provided to control the on / off of the first switching means, the second switching means, and the third switching means in order to selectively charge each or all of the first battery and the second battery, wherein the control unit variably adjusts the magnitude of the charging current supplied to each of the first battery and the second battery, and by adjusting the gate voltage of each of the first transistor and the second transistor to control the magnitude of the current flowing through each of the first transistor and the second transistor, the first A vehicle charging device that controls the first current supplied to the battery and the second current supplied to the second battery to be equal. Claim 2 delete Claim 3 delete Claim 4 A vehicle charging device according to claim 1, wherein the first switching means further comprises a first relay for controlling the supply or interruption of the charging current; and the second switching means further comprises a second relay for controlling the supply or interruption of the charging current. Claim 5 A vehicle charging device according to claim 1, wherein the control unit controls the first battery and the second battery to be charged as a single battery by turning on the third switching means and turning off the first switching means and the second switching means. Claim 6 A vehicle charging device according to claim 1, wherein the control unit controls the first battery and the second battery to be charged independently by turning off the third switching means and turning on the first switching means and the second switching means. Claim 7 A vehicle charging device according to claim 1, wherein the control unit controls the third switching means to turn off, and either one of the first switching means and the second switching means to turn on and the other to turn off, so that only one of the first battery and the second battery is charged exclusively. Claim 8 A vehicle charging device according to claim 1, wherein the control unit controls the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of an external charger supplying the charging current. Claim 9 A third switching means provided between a first battery and a second battery and configured to electrically connect or disconnect the first battery and the second battery; and a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery; A control method for a vehicle charging device comprising a second switching means arranged to supply or cut off a charging current supplied from the outside to the second battery, the method comprising: a step of checking the charging capacity of an external charger supplying the charging current; and a step of controlling the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of the external charger, wherein the controlling step comprises variably adjusting the magnitude of the charging current supplied to each of the first battery and the second battery, by adjusting the gate voltage of each of the first transistor constituting the first switching means and the second transistor constituting the second switching means to adjust the magnitude of the current flowing through each of the first transistor and the second transistor, thereby controlling such that the first current supplied to the first battery and the second current supplied to the second battery are equal, wherein the first switching means includes a first transistor for adjusting the amount of the charging current supplied, and the second switching means includes a second Control method for a vehicle charging device including a transistor. Claim 10 delete Claim 11 delete Claim 12 A method for controlling a vehicle charging device according to claim 9, wherein the first switching means further comprises a first relay for controlling the supply or interruption of the charging current; and the second switching means further comprises a second relay for controlling the supply or interruption of the charging current. Claim 13 A control method for a vehicle charging device according to claim 9, wherein the third switching means is turned on and the first switching means and the second switching means are turned off so that the first battery and the second battery are charged as a single battery. Claim 14 A control method for a vehicle charging device according to claim 9, wherein the third switching means is turned off and the first switching means and the second switching means are turned on so that the first battery and the second battery are each charged independently. Claim 15 A method for controlling a vehicle charging device according to claim 9, wherein the third switching means is turned off, either one of the first switching means and the second switching means is turned on and the other is turned off, so that only one of the first battery and the second battery is charged exclusively. Claim 16 A first battery and a second battery; a third switching means provided between the first battery and the second battery and configured to electrically connect or disconnect the first battery and the second battery; a first switching means including a first transistor for controlling the amount of charging current supplied from the outside and for controlling the amount of charging current supplied; a second switching means including a second transistor for controlling the amount of charging current supplied from the outside and for controlling the amount of charging current supplied; and a control unit provided to control the on / off of the first switching means, the second switching means, and the third switching means in order to selectively charge each or all of the first battery and the second battery, wherein the control unit variably adjusts the magnitude of the charging current supplied to each of the first battery and the second battery, and adjusts the gate voltage of each of the first transistor and the second transistor, thereby [regarding] the first transistor and the second transistor A vehicle that controls the first current supplied to the first battery and the second current supplied to the second battery to be equal by adjusting the magnitude of the current flowing through each. Claim 17 A first battery and a second battery; a third switching means provided between the first battery and the second battery and configured to electrically connect or disconnect the first battery and the second battery; and a first switching means provided to supply or cut off a charging current supplied from the outside to the first battery; A method for controlling a vehicle comprising a second switching means arranged to supply or cut off a charging current supplied from the outside to the second battery, the method comprising: a step of checking the charging capacity of an external charger supplying the charging current; and a step of controlling the first switching means, the second switching means, and the third switching means so that each or all of the first battery and the second battery are selectively charged in correspondence with the charging capacity of the external charger, wherein the controlling step comprises variably adjusting the magnitude of the charging current supplied to each of the first battery and the second battery, by adjusting the gate voltage of each of the first transistor constituting the first switching means and the second transistor constituting the second switching means to adjust the magnitude of the current flowing through each of the first transistor and the second transistor, thereby controlling such that the first current supplied to the first battery and the second current supplied to the second battery are equal, wherein the first switching means comprises a first transistor for adjusting the amount of the charging current supplied, and the second switching means comprises a second transistor for adjusting the amount of the charging current supplied. Vehicle control method.

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