System and method for detecting faults of a fast charge relay

Abstract

The present invention relates to a system and method for detecting a failure of a rapid charging relay. A charging system includes a charger, a battery charged by receiving power of a first voltage from the charger, a multi-charging device configured to step up power of a second voltage lower than the first voltage to the first voltage and supply the stepped-up power to the battery, a charging relay connected at a position between the battery and the charger and configured to switch to an on state when power of the first voltage is supplied from the charger and to switch to an off state when power of the second voltage is supplied from the charger, and a charging controller configured to control whether power of the first voltage is supplied to the battery through the charging relay or power is supplied to the battery through the multi-charging device based on whether a fuse failure of the charging relay occurs.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0080430, filed on June 30, 2020, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a system and method for detecting faults in a fast-charging relay, and more specifically, to a system and method for detecting faults in a fast-charging relay that can compare the neutral terminal capacitor voltage, the inverter capacitor voltage, and the battery voltage to diagnose whether the fast-charging relay has blown, and control the corresponding multi-charge operation based on whether the fast-charging relay has blown. Background Technology

[0004] Typically, environmentally friendly vehicles, such as electric or hybrid vehicles, are equipped with high-voltage batteries that supply drive power to the electric motor. These batteries are also equipped with relays (main relays) to regulate the current applied to the high-voltage batteries and protect them.

[0005] Additionally, a fast-charging relay can be added to regulate the current between the charger and the high-voltage battery during fast charging.

[0006] In the structure where the main relay and the fast charging relay are connected in series, when both the main relay and the fast charging relay are turned on, the fast charger and the high-voltage battery are connected to each other to start charging, so that when the main relay is fused, the fast charging port will not expose high voltage.

[0007] In addition, the multi-charge system can charge vehicles using 800V batteries using a 400V-class charger. When charging the vehicle using either an 800V-class or 400V-class charger, the main relay and the multi-charge relay operate to perform the charging.

[0008] However, in the case of conventional high-voltage / high-power relays, the failure rate is higher than that of other electrical components, and melting or blowing can occur based on vibration, humidity, environmental conditions, or switching conditions.

[0009] In one example, the fast-charging relay can charge even when a fuse failure occurs, but it cannot charge when a fuse blows. Because there is currently no diagnostic logic for fuse blowouts, the user cannot know why charging is not performed when a fuse blows. Summary of the Invention

[0010] The present invention solves the above-mentioned problems in the prior art, while fully retaining the advantages achieved by the prior art.

[0011] One aspect of the present invention provides an apparatus capable of detecting the occurrence of a fast-charging relay meltdown (or relay circuit failure or relay malfunction) when charging a battery in a vehicle employing a multi-charging system using an 800V-level charger, and capable of charging the battery even when a meltdown has occurred; and provides a system and method for detecting a fast-charging relay failure, which diagnoses whether the fast-charging relay has melted by comparing the neutral terminal capacitor voltage, the inverter capacitor voltage, and the battery voltage, and controls the multi-charging system accordingly to charge the battery based on whether the fast-charging relay has melted.

[0012] The technical problems to be solved by the present invention are not limited to those described above. Through the following description, those skilled in the art will clearly understand any other technical problems not mentioned herein.

[0013] According to one aspect of the present invention, a system for detecting a fault in a charging relay includes: a battery charged by receiving power at a first voltage from a charger; a multi-charger including an inverter and a drive motor, wherein when power at a second voltage lower than the first voltage is supplied by the charger, the multi-charger uses the inverter and the drive motor to boost the power at the second voltage to the first voltage and supplies the boosted power to the battery; a charging relay connected between the battery and the charger, wherein when power at the first voltage is supplied from the charger, the charging relay switches to an on state, and when power at the second voltage is supplied from the charger, the charging relay switches to an off state; and a charging controller diagnoses a fuse fault in the charging relay; when it is determined that the charging relay is functioning normally, it controls the power at the first voltage supplied from the charger to be supplied to the battery through the charging relay; and when it is determined that a fuse fault has occurred at the charging relay, it controls the power to be supplied to the battery through the multi-charger.

[0014] In one embodiment, one end of the charging relay can be connected to the positive terminal of the battery, and the other end of the charging relay can be connected to the positive terminal of the charger.

[0015] In one embodiment, the multiple charging device may include: a boost circuit including an inverter and a drive motor; an inverter capacitor connected to the output terminal of the boost circuit; a multiple charging relay connected between the other end of the charging relay and the input terminal of the boost circuit; and a neutral terminal capacitor connected between the other end of the charging relay and the negative terminal of the battery.

[0016] In one implementation, the charging controller can determine that the charging relay is operating normally when the voltages of the inverter capacitor, battery, and neutral terminal capacitor are the same.

[0017] In one implementation, when it is determined that the charging relay is functioning normally, the charging controller can control the multiple charging relays to disconnect.

[0018] In one implementation, when the voltage of the neutral terminal capacitor differs from the voltage of the inverter capacitor or the battery voltage, the charging controller can determine that a fuse failure has occurred at the charging relay.

[0019] In one implementation, when a fuse failure is determined to have occurred at the charging relay, the charging controller can control the multiple charging relays to turn on.

[0020] According to another aspect of the present invention, a method for detecting a fault in a charging relay includes: a diagnostic operation in which a charging controller diagnoses a blown fault in the charging relay located between the battery and the charger, and charges the battery by receiving power at a first voltage from the charger; a first supply operation in which, when it is determined that the charging relay is functioning normally, the charging controller controls the supply of power at the first voltage supplied from the charger to the battery through the charging relay; and a second supply operation in which, when it is determined that a blown fault has occurred at the charging relay, the charging controller boosts the power at a second voltage lower than the first voltage supplied from the charger to the first voltage, and supplies the boosted power to the battery through a multiple charging device.

[0021] In one embodiment, the diagnostic operation may include: when the voltage of the inverter capacitor connected to the output terminal of the boost circuit including the inverter and the drive motor, the voltage of the battery, and the voltage of the neutral terminal capacitor connected at the other end of the charging relay between the negative terminal of the battery are the same, the charging controller determines that the charging relay is operating normally.

[0022] In one embodiment, the first supply operation may include: controlling multiple charging relays to disconnect when power of a first voltage supplied from the charger is supplied to the battery via a charging relay to charge the battery.

[0023] In one implementation, the diagnostic operation may include: when the voltage of the neutral terminal capacitor differs from the voltage of the inverter capacitor or the battery voltage, the charging controller determines that a fuse fault has occurred at the charging relay.

[0024] In one embodiment, the second supply operation may include controlling the multiple charging relays to turn on when a second voltage is supplied from the charger. Attached Figure Description

[0025] The above and other objects, features, and advantages of the invention will become more clearly understood from the detailed description presented thereafter in conjunction with the accompanying drawings:

[0026] Figure 1 A schematic diagram illustrating a system for detecting faults in a fast-charging relay according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram illustrating the charging process using 800V in a system for detecting faults in a fast-charging relay according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram illustrating the charging process using multiple charging devices in a system for detecting faults in a fast-charging relay according to an embodiment of the present invention; and

[0029] Figure 4 A flowchart illustrating a method for detecting faults in a fast-charging relay according to an embodiment of the present invention is provided. Detailed Implementation

[0030] Hereinafter, some embodiments of the invention will be described in detail with reference to the exemplary accompanying drawings. When adding reference numerals to components in each drawing, it should be noted that the same reference numerals denote components even when the same or equivalent components are shown in other drawings. Furthermore, in describing embodiments of the invention, detailed descriptions of related known configurations or functions that hinder understanding of the embodiments of the invention will be omitted.

[0031] In describing components according to embodiments of the invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended only to distinguish components from other components, and they do not limit the nature, order, or sequence of the components. Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be further understood that terms such as those defined in common dictionaries shall be construed as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0032] The following text will refer to Figures 1 to 3 The embodiments of the present invention are described in detail.

[0033] Figure 1 This is a schematic diagram illustrating a system for detecting faults in a fast-charging relay according to an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the charging process using 800V in a system for detecting faults in a fast-charging relay according to an embodiment of the present invention. Furthermore, Figure 3 This is a schematic diagram illustrating the charging process using a multi-charge device in a system for detecting faults in a fast-charging relay according to an embodiment of the present invention.

[0034] First, the charging system according to the present invention, including a fast-charging relay (which relates to multi-input charging technology), can directly charge the battery when connected to an 800V-level charger; when connected to a 400V-level charger, the voltage is boosted to 800V, and then the battery is charged through a multi-charger including the drive motor of the electric vehicle and an inverter. The 800V and 400V voltages are described as examples, and the invention is not limited thereto.

[0035] In this connection, a fast-charging relay located between the charger and the battery can change the charging path by turning it on or off based on the voltage of the charger to be used.

[0036] In other words, when an 800V charger is connected, the fast charging relay can switch to the ON state, allowing the charger's voltage to be directly supplied to the battery. When a 400V charger is connected, the fast charging relay can switch to the OFF state, so that the charger's voltage is not directly supplied to the battery, but instead boosted to 800V and supplied through multiple charging devices.

[0037] refer to Figure 1A system for detecting faults in a fast charging relay according to an embodiment of the present invention (which is capable of detecting a fuse fault in the circuit of the fast charging relay 330 that is broken due to heat (including a fault in the relay operating circuit or a relay malfunction)) may include: a battery 100, a main relay 310, a fast charging relay 330, a Q(-) relay 710, a multiple charging device 500, and a charging controller.

[0038] exist Figure 1 In this configuration, the charger 700 can be located outside the vehicle and can supply 400V or 800V of electrical power to the vehicle when it is electrically connected to the vehicle.

[0039] Battery 100 may be a high-voltage battery that supplies drive voltage to the vehicle's drive unit (e.g., motor). When the vehicle is electrically connected to charger 700, battery 100 can be charged at 800V using the voltage supplied from charger 700.

[0040] The main relay 310, which is connected in series with each of the positive (+) and negative (-) terminals of the battery 100, can regulate the current input to or output from the battery 100.

[0041] The initial charging resistor and the initial charging relay can be connected in parallel with the main relay 310 connected to the positive (+) terminal of the battery 100. When the circuit is composed of the main relay 310, the initial charging resistor and the initial charging relay can be used to prevent the main relay 310 from melting.

[0042] One end of the fast charging relay 330 is connected to the main relay 310, which is connected to the positive (+) terminal of the battery 100. The other end of the fast charging relay 330 is connected to the positive (+) terminal of the charger 700. When the charger 700 is electrically connected to the vehicle, the fast charging relay 330 can regulate the current between the battery 100 and the charger 700.

[0043] When the battery 100 is being charged, the main relay 310 and the fast charging relay 330 can be switched on, and the charging power applied from the charger 700 can be supplied to the battery 100.

[0044] In this connection, the main relay 310 and the fast charging relay 330 can be controlled to be turned on sequentially, or the fast charging relay 330 can be controlled to be turned on after the main relay 310 is turned on, or the main relay 310 can be controlled to be turned on after the fast charging relay 330 is turned on.

[0045] For example, in the case of a combined charging scheme, the fast charging relay 330 can be controlled to turn on after the main relay 310 is turned on. In the case of a CHAdeMO charging scheme or an SGS charging scheme, the main relay 310 can be controlled to turn on after the fast charging relay 330 is turned on.

[0046] Since the charging voltage of battery 100 is 800V, the 800V DC voltage supplied from charger 700 can charge battery 100 without boosting the voltage.

[0047] The Q(-) relay 710 can be connected between the negative (-) terminal of the charger 700 and the negative (-) terminal of the battery 100.

[0048] When a 400V DC voltage is supplied through the charger 700, the multi-charger 500 boosts the 400V voltage to 800V via a three-phase drive motor and an inverter, and then supplies the 800V voltage to the battery 100 to charge the battery 100. The multi-charger 500 may include: a boost circuit including a drive motor and an inverter, an inverter capacitor 510, a neutral terminal capacitor 530, and a multi-charger relay 550.

[0049] A boost circuit that may include a three-branch half-bridge circuit may form a branch including an inductor between a pair of switching elements to form a boost scheme, thereby boosting an input voltage of 400V to produce an output voltage of 800V.

[0050] In this connection, the inductor can be the coil of the drive motor, and the switching element can be a component of the inverter.

[0051] Therefore, the combination of the inductance of the drive motor and the switching elements of the inverter can form a boost circuit for a boost scheme to boost the 400V input voltage to generate an 800V output voltage.

[0052] The multi-charge relay 550 can be connected in series with the other end of the fast charging relay 330 and the input terminal of the boost circuit, and can regulate the current between the boost circuit and the charger 700 when the charger 700 is electrically connected to the vehicle.

[0053] The neutral terminal capacitor 530 can be connected in parallel between the other end of the fast charging relay 330 and the negative (-) terminal of the battery 100, and can stably control the input terminal of the boost circuit by eliminating the DC voltage ripple when boosting a 400V input voltage to produce an 800V output voltage.

[0054] The inverter capacitor 510 can be connected in parallel to the two ends of the half-bridge circuit, which serves as the output terminal of the boost circuit, and can stably control the output terminal of the boost circuit by eliminating the ripple of the DC voltage boosted and output when charging the battery 100.

[0055] Inverter capacitor 510 and neutral terminal capacitor 530 can be connected in parallel.

[0056] In one example, while the vehicle is in motion, the inverter of the multiple charging device 500 can convert the DC power charged in the battery 100 into AC power and supply the AC power to the vehicle's drive motor, thereby enabling the vehicle to move.

[0057] The charging controller may include a battery management system (BMS). When a blown fuse fault in the fast charging relay 330 is diagnosed and it is determined that the fast charging relay 330 is functioning normally, the charging controller can control the supply of 800V voltage from the charger 700 to the battery 100 through the fast charging relay 330. Furthermore, when a blown fuse fault is determined to occur at the fast charging relay 330, the charging controller can control the supply of power to the battery 100 through the multi-charger 500.

[0058] First, after controlling the fast charging relay 330 and the main relay 310 to turn on in order to diagnose whether the fast charging relay 330 has blown, the charging controller can identify the voltage of the inverter capacitor 510 and the voltage of the neutral terminal capacitor 530.

[0059] Then, since the inverter capacitor 510 and the neutral terminal capacitor 530 are connected in parallel, when the fast charging relay 330 is connected in the circuit, the voltage of the inverter capacitor 510, the voltage of the battery 100 and the voltage of the neutral terminal capacitor 530 can be the same.

[0060] Therefore, when the voltage of inverter capacitor 510, battery 100 and neutral terminal capacitor 530 are the same, it can be determined that fast charging relay 330 is working normally.

[0061] refer to Figure 2 When the fast charging relay 330 is confirmed to be working normally, as a basic charging operation, the charging controller can control the fast charging relay 330 and the main relay 310 to be turned on, and control the multiple charging relay 550 to be turned off, so that the 800V power supplied from the charger 700 can be quickly charged to the battery 100 through the fast charging relay 330.

[0062] In one example, when the voltage of inverter capacitor 510 is the same as that of battery 100, but the voltage of neutral terminal capacitor 530 is different from that of inverter capacitor 510 or battery 100, the charge controller can determine that a fuse failure has occurred at fast charging relay 330. Although not shown, a voltage sensor or voltage measurement circuit may be included to measure the voltage of each component and send the measurement results to the charge controller, so that the charge controller can determine whether a fuse failure has occurred at fast charging relay 330 based on the measurement results.

[0063] In other words, when the fast charging relay 330 is disconnected in the circuit due to a fuse failure, the voltage may change because the parallel connection between the inverter capacitor 510 and the neutral terminal capacitor 530 is broken.

[0064] refer to Figure 3 When a fuse failure is detected at the fast charging relay 330, as a multiple charging operation, the charging controller can control the multiple charging relay to turn on, control the initial charging of the neutral terminal capacitor 530, and control the Q(-) relay to turn on.

[0065] Subsequently, the 400V power supplied from the charger 700 can be boosted to 800V via a boost circuit, thus enabling the battery 100 to charge quickly.

[0066] The following text will refer to Figure 4 A method for detecting faults in a fast-charging relay according to another embodiment of the present invention is described in detail. Figure 4 A flowchart illustrating a method for detecting faults in a fast-charging relay according to an embodiment of the present invention is provided.

[0067] In the following text, it is assumed that Figure 1 The system execution for detecting faults in fast charging relays. Figure 4 The process in.

[0068] First, when the vehicle is started and the charger is connected for charging, the controller is activated (S101). The charging controller can determine whether the charging is AC charging or DC charging. When it is determined that the charging is AC charging (S102), the charging controller can charge the battery 100 by utilizing the charging process of a slow charger (S103).

[0069] The slow charger supplies commercial AC power to the vehicle in its original form. The AC voltage supplied from the slow charger can be rectified to 800V DC voltage by the on-board charger (OBC) inside the vehicle and then used to charge the battery 100.

[0070] In one example, when it is determined that the charging is DC charging (S102), the charging controller can communicate with the charger 700 (EVSE) via PLC communication (S104) and perform a diagnosis of the fuse of the Q(-) relay 710 as the initial charging process of the charger 700 (S105).

[0071] Subsequently, the charging controller can determine whether the power supplied from the charger 700 is 400V or 800V (S106).

[0072] Then, when 800V power is supplied, as a basic charging operation, the charging controller can control the fast charging relay 330 to turn on (S107), control the main relay 310 to turn on (S108), and determine whether the main relay 310 is working in the on state (S109).

[0073] Subsequently, the charging controller can perform a diagnostic check for the blown fuse of the fast charging relay 330 (S110). When it is determined that the fast charging relay 330 is functioning normally, the charging controller can control the Q(-) relay 710 to turn on (S111). In addition, the charging controller can request current from the charger 700 to charge the battery 100 with 800V power (S112).

[0074] In one example, when it is determined that the fast charging relay 330 is blown and faulty (S110), as a multiple charging operation, the charging controller can control the multiple charging relay 550 to turn on in order to diagnose the blown state of the multiple charging relay 550 (S114), to initially charge the neutral terminal capacitor 530 (S115), and to control the Q(-) relay 710 to turn on (S116).

[0075] Subsequently, the charging controller can control the boost circuit to turn on (S117), calculate the input current of the charger 700 (S118), and request current from the charger 700 so as to charge the battery 100 using the 800V voltage obtained by boosting the 400V voltage (S119).

[0076] In one example, when determining whether the power supplied from the charger 700 is 400V or 800V (S106), the charging controller can charge the battery 100 via multiple charging operations by directly selecting the supply of 400V power.

[0077] In other words, the charging controller can select the 400V power supply from the charger 700, control the main relay 310 to turn on, and then perform a diagnosis of the fuse of the fast charging relay 330 (S113). Subsequently, it controls the multiple charging relay 550 to turn on after the fuse diagnosis (S114), thereby charging the battery 100 through multiple charging operations.

[0078] As described above, this technology provides a device that, when charging a battery in a vehicle equipped with a multi-charging system using an 800V-class charger, can detect the occurrence of a fast-charging relay meltdown (or relay circuit failure or relay malfunction) and can continue charging the battery even when a meltdown occurs. This technology has the advantages of diagnosing whether the fast-charging relay has melted by comparing the neutral terminal capacitor voltage, the inverter capacitor voltage, and the battery voltage; controlling the multi-charging system accordingly to charge the battery based on whether the fast-charging relay has melted; and improving charging robustness even if a component failure has already occurred.

[0079] In one example, the method for detecting faults in a fast-charging relay based on S101 to S119 according to the present invention can be programmed and stored in a recording medium to be read by a computer.

[0080] Therefore, the operation of this method and / or the operation performed by the charging controller can be embodied in hardware or software modules. Software modules can reside on computer-readable non-volatile storage media, such as RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disks, removable disks, and CD-ROMs. The storage media can be coupled to the charging controller, which includes a processor. When the processor executes the software module, the processor can be configured to perform the aforementioned operations, including but not limited to: performing various determinations and sending on / off signals to various relays / switches to control the on / off state of each relay / switch.

[0081] The above description is merely an example of the technical concept of the present invention, and those skilled in the art can make various modifications and changes without departing from the basic characteristics of the present invention.

[0082] Therefore, the embodiments disclosed in this invention are not intended to limit the technical concept of the invention, but rather to explain the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of the invention should be interpreted as being covered by the scope of the appended claims, and all technical concepts falling within the scope of the claims should be interpreted as being included within the scope of the invention.

[0083] This technology provides a device that, when charging a battery in a vehicle equipped with a multi-charging system using an 800V-class charger, can detect the occurrence of a blown fast-charging relay (or a fault in the relay's operating circuit or a malfunction of the relay) and can still charge the battery even when a blown fault occurs. This technology has the effect of diagnosing whether the fast-charging relay is blown by comparing the neutral terminal capacitor voltage, the inverter capacitor voltage, and the battery voltage, and controlling the multi-charging system accordingly to charge the battery based on whether the fast-charging relay is blown.

[0084] In addition, various effects that can be directly or indirectly identified through this document can be provided.

[0085] Although the present invention has been described above with reference to exemplary embodiments and accompanying drawings, the invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and alterations can be made to the invention without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A system for detecting faults in a charging relay, the system comprising: charger; A battery that is charged by receiving power at a first voltage from a charger; A multi-charge device includes an inverter and a drive motor, wherein when power at a second voltage lower than a first voltage is supplied by a charger, the multi-charge device uses the inverter and drive motor to boost the power at the second voltage to the first voltage and supplies the boosted power to the battery. A charging relay, connected between the battery and the charger, wherein the charging relay switches to an ON state when power of a first voltage is supplied from the charger, and switches to an OFF state when power of a second voltage is supplied from the charger; and The charging controller is configured as follows: Diagnose the fuse failure of the charging relay; When it is determined that the charging relay is working properly, the power supplied from the first voltage of the charger is supplied to the battery through the charging relay; When a fuse failure is detected at the charging relay, control power is supplied to the battery through multiple charging devices. The multiple charging device includes: A boost circuit, which includes an inverter and a drive motor; The inverter capacitor is connected to the output terminal of the boost circuit. A multiple charging relay, connected between the other end of the charging relay and the input terminal of the boost circuit; and The neutral terminal capacitor is connected between the other end of the charging relay and the negative terminal of the battery. The charging controller is configured to determine that a fuse failure has occurred at the charging relay when the voltage of the neutral terminal capacitor is different from the voltage of the inverter capacitor or the battery voltage.

2. The system for detecting faults in a charging relay according to claim 1, wherein, One end of the charging relay is connected to the positive terminal of the battery, and the other end of the charging relay is connected to the positive terminal of the charger.

3. The system for detecting faults in a charging relay according to claim 1, wherein, The charging controller is configured to determine that the charging relay is working normally when the voltages of the inverter capacitor, battery, and neutral terminal capacitor are the same.

4. The system for detecting faults in a charging relay according to claim 3, wherein, The charging controller is configured to disconnect multiple charging relays when it is determined that the charging relays are working normally.

5. The system for detecting faults in a charging relay according to claim 1, wherein, The charging controller is configured to activate multiple charging relays when a fuse failure is detected at the charging relay.

6. A method for detecting a fault in a charging relay, the method comprising: The diagnostic operation is as follows: the charging controller diagnoses the fuse failure of the charging relay at the location connected between the battery and the charger, and charges the battery by receiving power from the charger at a first voltage. The first supply operation is as follows: when it is determined that the charging relay is working normally, the charging controller controls the power supplied from the first voltage of the charger to be supplied to the battery through the charging relay; The second supply operation is as follows: when a fuse failure is detected at the charging relay, the charging controller boosts the power supplied by the charger (which is lower than the first voltage) to the first voltage, and then supplies the boosted power to the battery through multiple charging devices. The diagnostic operation includes: When the voltage of the neutral terminal capacitor, located between the other end of the charging relay and the negative terminal of the battery, differs from the voltage of the inverter capacitor connected to the output terminal of the boost circuit, which includes the inverter and the drive motor, or the battery voltage, the charging controller determines that a fuse failure has occurred at the charging relay.

7. The method according to claim 6, wherein, The diagnostic procedure includes: When the voltages of the inverter capacitor, the battery, and the neutral terminal capacitor are the same, the charging controller determines that the charging relay is working normally.

8. The method according to claim 7, wherein, The first supply operation includes: When the power supplied by the first voltage from the charger is supplied to the battery through the charging relay to charge the battery, the multiple charging relays are disconnected.

9. The method according to claim 6, wherein, The second supply operation includes: When a second voltage is supplied from the charger, the multiple charging relays are activated.

10. A non-volatile computer-readable recording medium, wherein, The program for performing the method of claim 6 is recorded in the non-volatile computer-readable recording medium.

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