Electric vehicle or charger for detecting abnormal state of electric vehicle wireless charging system and maintaining charging standby state or charging state

Abstract

The present invention relates to an electric vehicle that, when an abnormal state is detected during wireless charging via a charger or the electric vehicle, operates to maintain a charging standby state, the electric vehicle comprising: an EVCC module that communicates with an SECC module of a charger and controls a wireless charging state; a receiving coil that receives power from the charger; a battery pack that stores the received power; and a BMS module that controls a charging state of the battery pack, wherein the EVCC module is configured to, when a charging standby state maintenance request signal is received from the SECC module, switch the electric vehicle to the charging standby state.

Description

Detecting abnormal conditions in an electric vehicle wireless charging system and maintaining the electric vehicle or charger in a charging standby state or charging state

[0001] The present invention relates to an electric vehicle or a charger that detects an abnormal state of an electric vehicle wireless charging system and maintains a charging standby state or a charging state.

[0002] Currently, electric vehicle (EV) battery charging is primarily performed at charging stations. There are two main EV charging methods: wired charging via charging stations and vehicle-to-vehicle (V2V) charging, which involves power transfer between vehicles. However, wireless EV charging technology based on wireless power transfer (WPT) is actively being developed, and related standardization efforts are also underway.

[0003] The present invention seeks to solve the problem of existing wireless charging systems where charging is immediately stopped when an abnormal condition is detected, causing inconvenience to users due to charging being stopped due to minor problems such as dust or minor coil misalignment.

[0004] The present invention seeks to solve the problem that when an abnormal condition occurs in a conventional wireless charging system, the system cannot accurately classify the condition or diagnose the cause, but instead responds by simply stopping or resuming charging, thereby lowering charging stability and efficiency.

[0005] The present invention seeks to solve the problem of energy efficiency reduction due to stopping or restarting charging without evaluating the possibility of recovery in existing wireless charging systems.

[0006] The present invention seeks to solve the problem of safety issues such as overcharging, overheating, and electrical damage that may occur due to inadequate response to abnormal conditions in existing wireless charging systems.

[0007] The present invention relates to an electric vehicle that operates to maintain a charging standby state when an abnormal state is detected during wireless charging by a charger or an electric vehicle, the electric vehicle comprising: an EVCC module that communicates with an SECC module of the charger and controls the wireless charging state; a receiving coil that receives power from the charger; a battery pack that stores the received power; and a BMS module that controls the charging state of the battery pack; wherein the EVCC module is configured to switch the electric vehicle to the charging standby state when it receives a request signal to maintain a charging standby state from the SECC module.

[0008] Additionally, the EVCC module is configured to control the BMS module to stop supplying current to the battery pack when receiving a charge standby state maintenance request signal from the SECC module.

[0009] Additionally, the EVCC module is configured to communicate with the SECC module in the charging standby state to diagnose the cause of the abnormal state.

[0010] Additionally, the EVCC module is configured to stop communication with the SECC module when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition has been detected a number of times exceeding a threshold.

[0011] Additionally, the EVCC module is configured to stop communication with the SECC module when it is determined that an abnormal condition detected by the cause of the diagnosed abnormal condition has been detected for a time exceeding a threshold.

[0012] Additionally, the EVCC module is configured to communicate with the SECC module to retry detecting the abnormal condition when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times lower than a threshold and being maintained for a time lower than a threshold.

[0013] The present invention relates to a charger configured to detect an abnormal state during wireless charging by communicating with an electric vehicle and to maintain a charging standby state of the electric vehicle, the charger comprising: an SECC module for communicating with the electric vehicle and controlling a charging state; a transmitting coil for transmitting power to the electric vehicle; and a wireless charging transmitting unit for controlling power supplied to the transmitting coil; wherein the SECC module is configured to control the wireless charging transmitting unit to stop supplying power to the transmitting coil and to transmit a charging standby state maintenance request signal to the EVCC module when detecting an abnormal state of the electric vehicle or receiving abnormal state detection information from an EVCC module of the electric vehicle.

[0014] Additionally, the SECC module is configured to communicate with the EVCC module in a charging standby state of the electric vehicle to diagnose the cause of the abnormal state.

[0015] Additionally, the SECC module is configured to stop communication with the EVCC module when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition has been detected a number of times exceeding a threshold.

[0016] Additionally, the SECC module is configured to stop communication with the EVCC module when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition has been detected for a time exceeding a threshold.

[0017] Additionally, the SECC module is configured to communicate with the EVCC module to retry detecting the abnormal condition when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times lower than a threshold and being maintained for a time lower than a threshold.

[0018] The present invention relates to a charger configured to detect an abnormal state during wireless charging by communicating with an electric vehicle and to maintain a charging standby state of the electric vehicle, the charger comprising: an SECC module for communicating with the electric vehicle and controlling a charging state; a transmitting coil for transmitting power to the electric vehicle; and a wireless charging transmitting unit for controlling power supplied to the transmitting coil; wherein the SECC module is configured to control the wireless charging transmitting unit to stop supplying power to the transmitting coil and to transmit a charging standby state maintenance request signal to the EVCC module when detecting an abnormal state of the electric vehicle or receiving abnormal state detection information from an EVCC module of the electric vehicle.

[0019] Additionally, the SECC module is configured to communicate with the EVCC module in a charging standby state of the electric vehicle to diagnose the cause of the abnormal state.

[0020] Additionally, the SECC module is configured to stop communication with the EVCC module when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition has been detected a number of times exceeding a threshold.

[0021] Additionally, the SECC module is configured to stop communication with the EVCC module when it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition has been detected for a time exceeding a threshold.

[0022] The present invention relates to an electric vehicle capable of maintaining a charging state when an abnormal state is detected during wireless charging by a charger or an electric vehicle, the electric vehicle comprising: an EVCC module for communicating with an SECC module of the charger and controlling the wireless charging state; a receiving coil for receiving power from the charger; a battery pack for storing the received power; and a BMS module for controlling the charging state of the battery pack; wherein the EVCC module is configured to classify the abnormal state based on an error level of the detected abnormal state, and is configured to maintain the charging state of the electric vehicle when the classified abnormal state is classified as having an error level below a threshold.

[0023] In addition, the EVCC module is configured to classify the abnormal state based on the level of error of the detected abnormal state, and if the classified abnormal state is classified as having an error level higher than a threshold, the EVCC module is configured to control the BMS module to stop supplying current to the battery pack.

[0024] The present invention relates to an electric vehicle capable of maintaining a charging state when an abnormal state is detected during wireless charging by a charger or an electric vehicle, the electric vehicle comprising: an EVCC module for communicating with an SECC module of the charger and controlling the wireless charging state; a receiving coil for receiving power from the charger; a battery pack for storing the received power; and a BMS module for controlling the charging state of the battery pack; wherein the EVCC module is configured to classify the abnormal state based on an error level of the detected abnormal state, and when the classified abnormal state is classified as having an error level below a threshold, the EVCC module receives a request signal for maintaining a charging standby state from the SECC module, thereby switching the electric vehicle to the charging standby state.

[0025] The present invention relates to a charger configured to maintain a charging state of an electric vehicle when an abnormal state of the electric vehicle is detected during wireless charging by communicating with the electric vehicle, the charger comprising: an SECC module for communicating with the electric vehicle and controlling the charging state; a transmitting coil for transmitting power to the electric vehicle; a wireless charging transmitter for controlling power supplied to the transmitting coil; a link capacitor for supplying power to the transmitting coil; and a UPS module capable of replacing power supply of the link capacitor; wherein the UPS module is configured to temporarily replace power of the link capacitor when the SECC module detects an abnormal state of the electric vehicle or when the SECC module receives abnormal state detection information from an EVCC module of the electric vehicle.

[0026] The present invention can provide an effect of preventing unnecessary termination of charging by switching to a charging standby state instead of immediately stopping charging when an abnormal condition occurs.

[0027] The present invention can provide the effect of classifying abnormal conditions by level during wireless charging of an electric vehicle and adjusting the charging state according to the severity of the error.

[0028] The present invention can provide the effect of resuming charging when an abnormal condition is resolved through a recovery process and communication maintenance function.

[0029] The present invention can provide an effect of improving charging efficiency by exploring the possibility of recovery from a charging standby state without stopping charging due to a minor problem.

[0030] The present invention can provide the effect of reducing the number of unnecessary charging interruptions and efficiently managing abnormal conditions, thereby improving the durability of a charger and an electric vehicle.

[0031] The present invention can provide the effect of comprehensively managing various abnormal conditions, such as foreign substance detection, coil alignment status monitoring, and power and temperature abnormality detection.

[0032] FIG. 1a is a drawing for explaining wireless charging between a battery and a charger of an electric vehicle according to the present invention.

[0033] Figure 1b is a drawing for explaining the configuration of a wireless charging system according to the present invention.

[0034] Figure 2 is a drawing for explaining a power transmission interruption process when an abnormal condition is detected during a wireless charging process of an existing electric vehicle.

[0035] FIG. 3 is a drawing for explaining a sequence for maintaining a charging state when an abnormal state is detected in a wireless charging system according to one embodiment of the present invention.

[0036] FIG. 4 is a drawing for explaining an embodiment of maintaining a vehicle-side charging state by error level detection according to one embodiment of the present invention.

[0037] FIG. 5 is a diagram for explaining an embodiment of requesting a vehicle to maintain a charging standby state by detecting an error level after a communication-capable current supply interruption step according to one embodiment of the present invention.

[0038] FIG. 6 is a drawing for explaining an embodiment of a step of temporarily replacing a link cap power supply in a UPS according to one embodiment of the present invention.

[0039] FIG. 7 is a diagram showing a power conversion flow of a wireless charging system and a connection structure for UPS or external power support according to one embodiment of the present invention.

[0040] Specific details of the embodiments are included in the detailed description and drawings.

[0041] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0042] FIG. 1a is a diagram illustrating wireless charging between an electric vehicle battery and a charger according to the present invention. FIG. 1b is a diagram illustrating the configuration of a wireless charging system according to the present invention.

[0043] According to the present invention, wireless charging between the battery of an electric vehicle (10) and a charger (20) is based on the principle of electromagnetic induction. Specifically, the transmitting coil (21-1) of the wireless charging transmitter (21) generates a magnetic field, and the receiving coil (11-1) of the wireless charging receiver (11) receives power through the magnetic field to charge the battery. In this process, alignment between the transmitting coil (21-1) of the wireless charging transmitter (21) and the receiving coil (11-1) of the wireless charging receiver (11) is required, and must be confirmed to reduce energy loss and ensure efficient wireless charging. Here, the wireless charging transmitter (21) includes a charging pad, and the wireless charging transmitter (21) can transmit power to the receiving coil (11-1) of the electric vehicle (10) through a wireless power transmission technology such as a magnetic induction method or a magnetic resonance method. At this time, the wireless charging transmitter (21) is connected to a power conversion device to generate an alternating current, and can generate a magnetic field with this current to transmit energy to the electric vehicle (10).

[0044] According to the present invention, since wireless charging between the battery of an electric vehicle (10) and the charger (20) transfers power without a physical connection, abnormal conditions may occur due to various external environmental factors. Specifically, if a foreign substance such as a metal material enters between the receiving coil (11-1) or the transmitting coil (21-1), the magnetic field may be distorted, causing heat generation or a decrease in charging efficiency. In addition, if the transmitting coil (21-1) and the receiving coil (11-1) are misaligned during wireless charging, the power transfer efficiency may be significantly reduced. In addition, if a sudden change in voltage or current occurs, detection and diagnosis may be required to protect the wireless charging system.

[0045] According to the present invention, since wired charging between the battery of an electric vehicle (10) and the charger (20) physically connects the electric vehicle (10) and the charger (20) via a charging cable, if an abnormality occurs during charging, the risk can be immediately detected and controlled using the communication system (SW / HW) inside and outside the electric vehicle (10). For example, wired charging between the battery of an electric vehicle (10) and the charger (20) can perform power cuts, error code output, and vehicle status monitoring through the communication system if an abnormality occurs during charging. However, wireless charging between the battery of an electric vehicle (10) and the charger (20) does not have a physical connection between the charger (20) and the electric vehicle (10) and is exposed to the external environment. Therefore, if an abnormality occurs during charging, charging is not immediately terminated, but the charging state may be maintained or additional diagnosis may be required depending on the situation. In addition, if charging is immediately terminated in all abnormal conditions, unnecessary charging interruptions may occur frequently. For example, temporary errors or minor misalignment do not significantly affect charging efficiency, so a process for the system to detect and resolve these is required.

[0046] The present invention can provide an electric vehicle (10) that operates to maintain a charging standby state when an abnormal state is detected during wireless charging by a charger (20) or an electric vehicle (10). Specifically, the electric vehicle (10) according to the present invention can include an EVCC module (12) that communicates with an SECC module (22) of a charger (20) and controls a wireless charging state, a receiving coil (11-1) that receives power from the charger (20), a battery pack (15) that stores the received power, and a BMS module (14) that controls a charging state of the battery pack (15). Specifically, the EVCC module (12) is configured to switch the electric vehicle (10) to a charging standby state when it receives a request signal to maintain a charging standby state from the SECC module (22).

[0047] According to one embodiment of the present invention, when the EVCC module (12) receives a request signal for maintaining a charge standby state from the SECC module (22), the EVCC module (12) is configured to control the BMS module (14) to stop supplying current to the battery pack (15). In addition, the EVCC module (12) may be configured to communicate with the SECC module (22) in the charge standby state to diagnose the cause of an abnormal state. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time greater than a threshold. In addition, the EVCC module (12) is configured to communicate with the SECC module (22) to retry detecting the abnormal condition if it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times below a threshold and being maintained for a time below a threshold.

[0048] According to the present invention, a charger (20) configured to communicate with an electric vehicle (10) to detect an abnormal state during wireless charging and maintain a charging standby state of the electric vehicle (10). Specifically, the charger (20) includes a SECC module (22) that communicates with the electric vehicle (10) and controls a charging state, a transmission coil (21-1) that transmits power to the electric vehicle (10), and a wireless charging transmitter (21) that controls power supplied to the transmission coil (21-1). Here, when the SECC module (22) detects an abnormal state of the electric vehicle (10) or receives abnormal state detection information from the EVCC module (12) of the electric vehicle (10), the SECC module (22) controls the wireless charging transmitter (21) to stop supplying power to the transmission coil (21-1) and transmits a charging standby state maintenance request signal to the EVCC module (12). At this time, the SECC module (22) is configured to communicate with the EVCC module (12) in the charging standby state of the electric vehicle (10) and diagnose the cause of the abnormal state. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than or equal to a threshold. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time period greater than or equal to a threshold. In addition, the SECC module (22) is configured to communicate with the EVCC module (12) to retry detecting the abnormal state when it is determined that at least one of the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times less than or equal to a threshold and has been maintained for a time period less than or equal to a threshold.

[0049] Figure 2 is a drawing for explaining a power transmission interruption process when an abnormal condition is detected during a wireless charging process of an existing electric vehicle.

[0050] Step 1: Starting the normal charging process (S10)

[0051] As illustrated, the wireless charging system (100) according to the present invention can perform a step (S10) of starting a normal charging process. Specifically, in the step (S100) of starting a normal charging process, if the electric vehicle (10) searches for a wireless charging space where a charger (20) is located, the abnormal condition detection system (100) can guide the electric vehicle (10) to the wireless charging location. In addition, the wireless charging system (100) can check the alignment of the wireless charging transmitter (21) and the wireless charging receiver (11) of the electric vehicle (10).

[0052] Abnormal condition detection process step (S20)

[0053] According to one embodiment of the present invention, before starting wireless charging, the wireless charging system (100) can perform a pairing step (S21) between the wireless charging transmitter (21) and the wireless charging receiver (11). Specifically, the wireless charging system (100) can perform a check to see whether the electric vehicle (10) and the charger (20) can communicate with each other and transmit power. In this case, a signal exchange and authentication process between the wireless charging transmitter (21) and the wireless charging receiver (11) may also be performed. At this time, if the connection between the wireless charging transmitter (21) and the wireless charging receiver (11) is confirmed, the wireless charging system (100) can perform an alignment check step (S22).

[0054] According to one embodiment of the present invention, the wireless charging system (100) can check whether the receiving coil (11-1) and the transmitting coil (21-1) are accurately aligned in the alignment check step (S22). Since the transmission efficiency of wireless power depends on the alignment state of the receiving coil (11-1) and the transmitting coil (21-1), if the alignment is not correct, energy loss, heat generation, or system error may occur. That is, the wireless charging system (100) can detect the physical positions of the electric vehicle (10) and the charger (20) through sensors located in the wireless charging transmitter (21) and the wireless charging receiver (11). In this case, the wireless charging system (100) can check the alignment of the receiving coil (11-1) and the transmitting coil (21-1), and if the alignment is confirmed, charging can start normally.

[0055] Abnormal condition detection step (S230)

[0056] According to one embodiment of the present invention, the wireless charging system (100) can determine whether an abnormal condition is detected in the abnormal condition detection step (S23). Specifically, if no abnormal condition is detected (S23-1), the wireless charging system (100) can continue the charging process normally. Furthermore, if an abnormal condition is detected (S23-2), the wireless charging system (100) can suspend charging or perform an abnormal condition diagnosis.

[0057] Power transmission interruption phase (S30)

[0058] According to one embodiment of the present invention, if an abnormal condition is detected (S23-2) in the abnormal condition detection step (S23), the wireless charging system (100) can temporarily suspend wireless charging in the power transmission interruption step (S30) and re-check the abnormal condition. Thereafter, after charging is interrupted, the wireless charging system (100) can re-perform the pairing step (S21) or the alignment confirmation step (S22).

[0059] As described above, the existing wireless charging system (100) is designed to immediately stop power transmission when an abnormal condition is detected during wireless charging. For example, the existing wireless charging system (100) is designed to immediately stop power transmission when a metallic foreign substance is detected in the wireless charging transmitter (21) or the wireless charging receiver (21) during wireless charging, or when a poor alignment between the wireless charging transmitter (21) and the wireless charging receiver (21) is detected. However, this method of immediately stopping power transmission when an abnormal condition of the existing wireless charging system (100) is detected may cause the charger (20) to react excessively sensitively even to minor causes that are not actually related to charging safety. For example, if charging is stopped when dust or small foreign substances are detected in the charger (20) or when temporary interference occurs, there is a problem that the user must manually resolve the problem. Accordingly, the existing wireless charging system (100) has the inconvenience of having to retry the pairing step (S21) or the alignment confirmation step (S22) to return to a normal charging state.

[0060] FIG. 3 is a drawing for explaining a sequence for maintaining a charging state when an abnormal state is detected in a wireless charging system according to one embodiment of the present invention.

[0061] The present invention can provide an electric vehicle (10) that operates to maintain a charging standby state when an abnormal state is detected during wireless charging by a charger (20) or an electric vehicle (10). Specifically, the electric vehicle (10) according to the present invention can include an EVCC module (12) that communicates with an SECC module (22) of a charger (20) and controls a wireless charging state, a receiving coil (11-1) that receives power from the charger (20), a battery pack (15) that stores the received power, and a BMS module (14) that controls a charging state of the battery pack (15). Specifically, the EVCC module (12) is configured to switch the electric vehicle (10) to a charging standby state when it receives a request signal to maintain a charging standby state from the SECC module (22).

[0062] According to one embodiment of the present invention, when the EVCC module (12) receives a request signal for maintaining a charge standby state from the SECC module (22), the EVCC module (12) is configured to control the BMS module (14) to stop supplying current to the battery pack (15). In addition, the EVCC module (12) may be configured to communicate with the SECC module (22) in the charge standby state to diagnose the cause of an abnormal state. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time greater than a threshold. In addition, the EVCC module (12) is configured to communicate with the SECC module (22) to retry detecting the abnormal condition if it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times below a threshold and being maintained for a time below a threshold.

[0063] According to the present invention, a charger (20) configured to communicate with an electric vehicle (10) to detect an abnormal state during wireless charging and maintain a charging standby state of the electric vehicle (10) can be provided. Specifically, the charger (20) includes a SECC module (22) that communicates with the electric vehicle (10) and controls a charging state, a transmission coil (21-1) that transmits power to the electric vehicle (10), and a wireless charging transmitter (21) that controls power supplied to the transmission coil (21-1). Here, when the SECC module (22) detects an abnormal state of the electric vehicle (10) or receives abnormal state detection information from the EVCC module (12) of the electric vehicle (10), the SECC module (22) controls the wireless charging transmitter (21) to stop supplying power to the transmission coil (21-1) and transmits a charging standby state maintenance request signal to the EVCC module (12).

[0064] At this time, the SECC module (22) is configured to communicate with the EVCC module (12) in the charging standby state of the electric vehicle (10) to diagnose the cause of the abnormal state. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time period greater than a threshold. In addition, the SECC module (22) is configured to retry detecting the abnormal state by communicating with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times less than a threshold and has been maintained for a time period less than a threshold.

[0065] Abnormal condition detection step (S100)

[0066] As illustrated, the wireless charging system (100) can determine whether an abnormal state is detected in the abnormal state detection step (S100). Specifically, the charger (20) or the electric vehicle (10) among the wireless charging system (100) can determine whether an abnormal state is detected in the abnormal state detection step (S100). For example, the charger (20) can detect an abnormal state through the current, voltage, temperature, or foreign object detection (FOD) sensor (21-2) of the wireless charging transmitter (21) in the abnormal state detection step (S100). For example, the charger (20) can detect an abnormal state when there is a possibility of overheating due to a metallic foreign substance such as a coin or a key being placed on the wireless charging transmitter (21), when the alignment between the wireless charging coils of the receiving coil (11-1) and the transmitting coil (21-1) is significantly deviated, resulting in an abnormally low power transmission efficiency, or when the current or voltage during charging exceeds a set threshold or fluctuates rapidly.

[0067] According to one embodiment of the present invention, the electric vehicle (10) can detect an abnormal condition through a battery management system (BMS) integrated with its own built-in sensors. For example, the electric vehicle (10) can detect an abnormal condition when the temperature of a battery cell rises rapidly or there is a risk of overcharging, when the receiving coil (11-1) of the wireless charging receiving unit (11) of the electric vehicle (10) is physically damaged or defective, or when the electric vehicle (10) is physically moved during charging and the coil alignment is misaligned.

[0068] Communication-enabled power transmission interruption stage (S110)

[0069] According to one embodiment of the present invention, if an abnormal state is detected by the charger (20) or the electric vehicle (10) in the abnormal state detection step (S100), the wireless charging system (100) may perform a power transmission interruption in the communicable power transmission interruption step (S110). That is, in order to prevent potential risks such as overheating and damage that may occur if power transmission continues, the wireless charging system (100) may perform a power transmission interruption in the communicable power transmission interruption step (S110). However, in the communicable power transmission interruption step (S110), the wireless charging system (100) may interrupt the wireless charging power transmission but maintain the communication between the charger (20) and the electric vehicle (10). Here, since the communication between the charger (20) and the electric vehicle (10) is maintained, the present invention can perform the electric vehicle charging standby state maintenance request step (S120) through the SECC (Supply Equipment Communication Controller) module (22).

[0070] Step (S120) of requesting maintenance of electric vehicle charging standby status through SECC module (22)

[0071] According to one embodiment of the present invention, the wireless charging system (100) can perform an electric vehicle charging standby state maintenance request step (S120). As illustrated in FIG. 1, the charger (20) includes a SECC (Supply Equipment Communication Controller) module (22), and the SECC module (22) can control and monitor the wireless charging state by exchanging data between the charger (20) and the electric vehicle (10). For example, the SECC module (22) can process charging power requirements, whether an abnormality occurs during charging, a charging termination request, etc. In addition, when an abnormality occurs, the SECC module (22) can maintain communication between the charger (20) and the electric vehicle (10), manage the charging state, and perform operations according to charging standards.

[0072] According to one embodiment of the present invention, the wireless charging system (100) can perform a request to maintain an electric vehicle charging standby state through the SECC module (22) in the electric vehicle charging standby state maintenance request step (S120) through the SECC. Specifically, the present invention can provide an effect of maintaining a standby state while keeping in mind the possibility of recovery of the wireless charging system (100) without completely terminating the charging process between the electric vehicle (10) and the charger (10) through the SECC. That is, the present invention can provide an effect of enabling the wireless charging system (100) to immediately resume recharging when there is a possibility that an abnormal state of the wireless charging system (100) can be resolved, thereby eliminating the need for the user to take additional action.

[0073] According to one embodiment of the present invention, communication between the SECC module (22) and the EVCC module (12) is designed according to a standard, and communication between the SECC module (22) and the EVCC module (12) can be achieved through a wired (PLC, Power Line Communication) or wireless (Wi-Fi, Bluetooth, etc.) method. When the electric vehicle (10) is connected to a charging pad or a charging cable, communication between the SECC module (22) and the EVCC module (12) begins, and the ID and authentication information of the electric vehicle (10) are transmitted to the SECC module (22), thereby establishing a secure connection between the charger (20) and the electric vehicle (10).

[0074] According to one embodiment of the present invention, the SECC module (22) communicates with the Electric Vehicle Communication Controller (EVCC) module (12) located inside the electric vehicle (10) and can continuously exchange charging status information. For example, the SECC module (22) can communicate with the EVCC module (12) to receive real-time data such as battery status, temperature, and charging demand, and can perform a request to keep the electric vehicle (10) in a charging standby state while the charger (20) attempts to recover from an abnormal state.

[0075] According to one embodiment of the present invention, the SECC module (22) can transmit the current status of the charger (20) to the electric vehicle (10). That is, the SECC module (22) can communicate with the EVCC module (12) to notify that an abnormality has been detected and can request the electric vehicle (10) to maintain a standby state by informing that a repair operation is in progress. In addition, the SECC module (22) can determine whether the electric vehicle (10) is capable of repair and can perform settings to maintain a charging standby.

[0076] Diagnosis execution step (S130)

[0077] According to one embodiment of the present invention, the SECC module (22) can detect in real time whether there is a foreign substance on the wireless charging transmitter (21) through the foreign substance detection sensor (21-2) built into the wireless charging transmitter (21) and perform an analysis. When charging starts, the SECC module (22) can activate the foreign substance detection sensor (21-2) to continuously monitor the state of the surface of the wireless charging transmitter (21). Here, the SECC module (22) can analyze a change in an electromagnetic signal detected around the wireless charging transmitter (21) and determine whether there is a conductive material such as a metal object such as a coin, a key, or a clip. In addition, the SECC module (22) can measure a temperature change on the surface of the wireless charging transmitter (21) and determine whether the detected temperature increase occurred during a normal charging process or was caused by overheating due to a foreign substance.

[0078] According to one embodiment of the present invention, the SECC module (22) can classify the nature of the foreign substance based on the collected data. Specifically, if the foreign substance is determined to be a non-conductive substance such as dust or a minor level that does not affect charging efficiency or safety, the SECC module (22) can transmit a notification to the EVCC module (12), and accordingly, the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to provide a user interface that displays a warning message to the user, thereby urging caution. Thereafter, the SECC module (22) can control the wireless charging system (100) to resume charging.

[0079] That is, if the abnormal state detected in the diagnosis execution step (S130) is determined to be a minor abnormal state and the abnormal state is detected less than a threshold number of times, the SECC module (22) can perform the Recovery process step (S130-1). For example, if a non-conductive material is detected for the first time, the SECC module (22) can control the wireless charging system (100) to perform the abnormal state detection step (S100) again by performing the Recovery process step (S130-1). For a specific example, the SECC module (22) can transmit a notification to the EVCC module (12), and accordingly, the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to provide the user with a user interface such as "Please brush the dust off the bottom of the vehicle." Accordingly, if the user removes dust from the bottom of the vehicle, the SECC module (22) can perform the Recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if the user does not remove dust from the bottom of the vehicle, since there is no abnormality in supplying power, the wireless charging system (100) can resume supplying power.

[0080] According to one embodiment of the present invention, if a foreign substance is detected as a conductive material such as metal, or if the cause of overheating is clearly determined to be a foreign substance, the SECC module (22) can notify the EVCC module (12), and the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to output a message saying, "Please remove the foreign substance from the charging pad," so as to request the user to directly resolve the problem. In this case, since the cause of overheating is clearly determined to be a foreign substance, if the user does not remove the foreign substance from the charging pad, the wireless charging system (100) determines that it corresponds to a case where an abnormal state is detected for the same reason even after a Recovery process exceeding a critical value or a time exceeding a critical value has passed (S130-2), and can perform a communication-impossible current supply interruption step (S140).

[0081] According to one embodiment of the present invention, before charging begins, the SECC module (22) can recognize the position of the receiving coil (11-1) of the electric vehicle (10) based on the magnetic field generation data of the wireless charging transmitter (21). In addition, during charging, the SECC module (22) can continuously monitor the relative movement or distance change between the receiving coil (22-1) and the transmitting coil (21-1) through the magnetic field sensor (21-3). Here, if the electric vehicle (10) moves slightly above the wireless charging transmitter (21) or the position of the receiving coil (11-1) is located at a distance greater than a threshold from the reference position, the SECC module (22) can determine that this is a minor alignment problem. However, if the receiving coil (11-1) moves to a position exceeding the charging efficiency threshold or the alignment of the receiving coil (22-1) and the transmitting coil (21-1) is misaligned to an impossible degree, a diagnosis can be made as a serious alignment problem. This will be described in detail with reference to FIGS. 4 and 5 below.

[0082] According to one embodiment of the present invention, in the case of a minor alignment issue as described above, the SECC module (22) may request the electric vehicle (10) to automatically adjust the position of the receiving coil (11-1). For example, if the vehicle's electric parking system or automatic steering system is activated to properly realign the coil, the SECC module (22) may maintain a charging standby state until this process is completed. In addition, the SECC module (22) may notify the EVCC module (12) of this so that the user can directly realign the receiving coil. Accordingly, the EVCC module (12) may display a warning message on the display unit (13) and provide a user interface such as "The charging coil alignment is not optimal. Please fine-tune the vehicle or recheck the position." Accordingly, if the user makes a fine adjustment to the electric vehicle (10), the SECC module (22) can perform the Recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if the user does not adjust the position of the electric vehicle (10), since there is no abnormality in supplying power, the wireless charging system (100) can resume supplying power.

[0083] According to one embodiment of the present invention, in the case of the alignment failure problem as described above, the wireless charging system (100) may determine that the case corresponds to a case where an abnormal state is detected for the same reason even after a Recovery process exceeding a critical value or a time exceeding a critical value has passed (S130-2). At this time, the SECC module (22) may transmit a charging termination signal to the EVCC module (12), and the EVCC module (12) may display a warning message on the display unit (13) and provide a user interface such as "Charging coil alignment is not possible. Please readjust the vehicle position and try charging again. Communication with the charger is interrupted." Thereafter, the wireless charging system (100) may perform a communication failure current supply interruption step (S140), and accordingly, communication between the EVCC module (12) and the SECC module (22) may be interrupted. In this case, since it is a case of an unalignable problem, if the user does not readjust the position of the vehicle, the wireless charging system (100) may determine that it corresponds to a case where an abnormal state is detected for the same reason even after a Recovery process exceeding a critical value or a time exceeding a critical value has passed (S130-2), and may perform a communication failure current supply interruption step (S140).

[0084] According to one embodiment of the present invention, the SECC module (22) can check whether the output voltage is within a set reference value range through the voltage sensor (21-4) of the charger (20), and can monitor the current transmitted to the transmitting coil (21-1) using the current sensor (21-5). Accordingly, the SECC module (22) can detect an abnormality by comparing real-time data with the set reference value. Specifically, the SECC module (22) can detect an abnormality when the voltage slightly exceeds or falls short of the set range, or when the current exceeds or continuously fluctuates a threshold value. At this time, the SECC module (22) can evaluate the influence of the surrounding environment, such as coil misalignment or external interference, in case of voltage instability in order to analyze the cause of the abnormality. In addition, in case of an excess of current, the SECC module (22) can check the status of the transmitting coil (21-1) and the receiving coil (11-1) to determine whether a problem occurred during the energy transfer process.

[0085] According to one embodiment of the present invention, when the SECC module (22) determines that the abnormal state is a temporary voltage instability abnormal state, the SECC module (22) can notify the EVCC module (12) of the voltage state and prepare to automatically resume charging when the voltage stabilizes. Accordingly, the EVCC module (12) can control the display unit (13) to provide a user interface such as "The charging voltage is temporarily unstable. Charging will resume after stabilization." Accordingly, when the charging voltage is stabilized, the SECC module (22) can perform the Recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if the charging voltage is not stabilized, since it is not a serious current excess state in which there is no abnormality in supplying power, the wireless charging system (100) can resume supplying power.

[0086] According to one embodiment of the present invention, when the SECC module (22) determines that the abnormal state is a serious current excess state, the SECC module (22) can notify the EVCC module (12) that the current exceeds a reference value or fluctuates greatly. Accordingly, the SECC module (22) transmits a charging stop signal to the EVCC module (12), and the EVCC module (12) can display a warning message to the user through the display unit (13). For example, the EVCC module (12) can provide a user interface such as "A serious current excess has been detected during charging. The charger has entered an abnormal state and needs to be inspected" through the display unit (13). Since this case is a case of a serious current excess problem, the wireless charging system (100) can determine that it corresponds to a case where the abnormal state is detected for the same reason even after a recovery process exceeding a critical value or a time exceeding a critical value has passed (S130-2), and can perform a communication failure current supply stop step (S140).

[0087] According to one embodiment of the present invention, the EVCC module (12) can regularly receive status information of the battery pack (15) from the BMS (Battery Management System) module (14) of the electric vehicle (10). Here, the status information of the battery pack that the EVCC module (12) receives from the BMS module (14) may include voltage, current, temperature, state of charge (SOC), and internal resistance value of individual cells. In addition, the EVCC module (12) can analyze whether there is an imbalance between cells by checking the voltage difference between individual cells, and if the voltage difference between cells exceeds the allowable range, it can determine that there is a cell imbalance. In addition, the EVCC module (12) can evaluate whether the SOC (State of Charge) of the battery pack (15) exceeds a set upper limit, and can analyze the possibility that the temperature of the battery pack (15) may rapidly increase due to overcharging through BMS data.

[0088] According to one embodiment of the present invention, in case of a minor cell imbalance problem, the EVCC module (12) can transmit a cell balancing command to the BMS module (14). Accordingly, the BMS module (14) can adjust the voltage between individual cells, and the cell balancing can be performed by consuming energy of high voltage cells using a resistor or additionally charging low voltage cells. In this case, since the user does not need to know the troubleshooting process, the BMS module (14) can provide a user interface such as "Optimizing battery status. Charging is in progress normally" on the display unit (13). Accordingly, when the voltage between individual cells is adjusted, the EVCC module (12) can perform the Recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if the voltage between individual cells is not adjusted, the wireless charging system (100) can resume supplying power since it is not a serious overcharge risk condition in which there is no problem in supplying power.

[0089] According to one embodiment of the present invention, in the case of a serious overcharge risk condition, the EVCC module (12) may provide a user interface such as "Warning: Battery overcharge risk detected. Vehicle inspection is required" through the display unit (13) so that the user can take immediate action when the SOC of the battery pack (15) exceeds the safety limit or the battery pack temperature rises rapidly. In this case, since it is a case of a serious overcharge risk, the wireless charging system (100) may determine that it corresponds to a case where an abnormal condition is detected for the same reason even after a Recovery process exceeding a critical value or a time exceeding a critical value has passed (S130-2), and may perform a communication failure current supply interruption step (S140).

[0090] According to one embodiment of the present invention, the EVCC module (12) can collect real-time temperature data of the battery pack (15) and the receiving coil (11-1) from the temperature sensor (16) inside the electric vehicle (10). Here, the EVCC module (12) can monitor the temperature of the battery pack (15) and the temperature occurring near the receiving coil (11-1) to evaluate whether there is an individual abnormality. At this time, the EVCC module (12) can check whether the collected data exceeds a set reference value. For example, the EVCC module (12) can analyze the cause of the exceedance when the temperature of the battery pack (15) exceeds 45°C or the temperature of the receiving coil (11-1) exceeds 60°C. For example, the EVCC module (12) can determine whether it is due to excessive power supply during charging, or whether it is due to a natural temperature rise due to a high temperature in the external environment. Additionally, the EVCC module (12) can determine whether a specific cell in the battery pack (15) is overheated or whether heat is generated due to increased internal resistance.

[0091] According to one embodiment of the present invention, in case of a slight temperature rise that is not a temperature rise due to a temporary factor or a serious temperature rise exceeding the reference temperature, the EVCC module (12) can notify the BMS module (14) of the temperature rise and take measures to disperse the heat inside the battery pack (15). In addition, the EVCC module (12) can temporarily stop the power supply to the receiving coil (11-1) to suppress the temperature rise. Accordingly, the EVCC module (12) can provide a user interface such as “The battery temperature has risen. Charging will be temporarily stopped for stabilization. Charging will resume after stabilization.” on the display unit (13). Accordingly, when the temperature of the battery pack (15), etc., returns to normal, the EVCC module (12) can perform a recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if temperature stabilization is not achieved, the wireless charging system (100) can resume power supply since it is not a serious condition in which the reference temperature exceeds the reference temperature, which is not abnormal in supplying power.

[0092] According to one embodiment of the present invention, in the case of a serious reference temperature exceeding state, the EVCC module (12) may provide a user interface such as "Warning: Battery temperature has reached a dangerous level. Charging has been stopped. Vehicle inspection is required" through the display unit (13) so that the user can take immediate action when the temperature of the battery pack (15) is in a serious reference temperature exceeding state. In this case, since it is a case of a serious reference temperature exceeding state, the wireless charging system (100) may determine that it corresponds to a case where an abnormality is detected for the same reason even after a critical recovery process or a critical time has passed (S130-2), and may perform a communication impossibility current supply interruption step (S140).

[0093] According to another embodiment of the present invention, the EVCC module (12) can recognize a case where the temperature of the battery pack (15) exceeds a first threshold temperature as a minor reference temperature exceeding state, and can recognize a case where the temperature of the battery pack (15) exceeds a second threshold temperature as a serious reference temperature exceeding state. For example, when the temperature of the battery pack (15) exceeds the first threshold temperature and is below the second threshold temperature, the wireless communication system (100) of the present invention can perform an abnormality detection step (S100). The wireless communication system (100) can perform a communication-enabled current supply interruption step (S110) because the temperature of the battery pack (15) exceeds the first threshold temperature. In this case, since the current supply from the charger (20) is interrupted, wireless charging is interrupted, but the EVCC module (12) and the SECC module (22) can still communicate. At this time, since the EVCC module (12) and the SECC module (22) are still capable of communication, the SECC module (22) can perform the step (S120) of requesting the EVCC module (12) to maintain the charging standby state of the electric vehicle (10).

[0094] Accordingly, the EVCC module (12) controls the BMS module (14) so ​​that the BMS module (14) can cut off the charging current to the battery pack (15), and the electric vehicle (10) can be maintained in a charging standby state. Thereafter, the EVCC module (12) can perform a diagnosis of the electric vehicle (10). For example, in the case of the first abnormal state detection, or in the case where the temperature of the battery pack (15) of the electric vehicle (10) exceeds the first threshold temperature, or in the case where the temperature exceeds the first threshold temperature only for a time below the threshold and drops below the first threshold temperature from the time above the threshold, if the abnormal state is detected for the same reason even after the Recovery process above the threshold or the time above the threshold has passed (S130-2), the Recovery process step (S130-1) can be performed, and the abnormal state detection step (S100) can be performed again.

[0095] FIG. 4 is a drawing for explaining an embodiment of maintaining a vehicle-side charging state by error level detection according to one embodiment of the present invention.

[0096] The present invention can provide an electric vehicle (10) that operates to maintain a charging standby state when an abnormal state is detected during wireless charging by a charger (20) or an electric vehicle (10). Specifically, the electric vehicle (10) according to the present invention can include an EVCC module (12) that communicates with an SECC module (22) of a charger (20) and controls a wireless charging state, a receiving coil (11-1) that receives power from the charger (20), a battery pack (15) that stores the received power, and a BMS module (14) that controls a charging state of the battery pack (15). Specifically, the EVCC module (12) is configured to switch the electric vehicle (10) to a charging standby state when it receives a request signal to maintain a charging standby state from the SECC module (22).

[0097] According to one embodiment of the present invention, when the EVCC module (12) receives a request signal for maintaining a charge standby state from the SECC module (22), the EVCC module (12) is configured to control the BMS module (14) to stop supplying current to the battery pack (15). In addition, the EVCC module (12) may be configured to communicate with the SECC module (22) in the charge standby state to diagnose the cause of an abnormal state. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time greater than a threshold. In addition, the EVCC module (12) is configured to communicate with the SECC module (22) to retry detecting the abnormal condition if it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times below a threshold and being maintained for a time below a threshold.

[0098] According to the present invention, a charger (20) configured to communicate with an electric vehicle (10) to detect an abnormal state during wireless charging and maintain a charging standby state of the electric vehicle (10) can be provided. Specifically, the charger (20) includes a SECC module (22) that communicates with the electric vehicle (10) and controls a charging state, a transmission coil (21-1) that transmits power to the electric vehicle (10), and a wireless charging transmitter (21) that controls power supplied to the transmission coil (21-1). Here, when the SECC module (22) detects an abnormal state of the electric vehicle (10) or receives abnormal state detection information from the EVCC module (12) of the electric vehicle (10), the SECC module (22) controls the wireless charging transmitter (21) to stop supplying power to the transmission coil (21-1) and transmits a charging standby state maintenance request signal to the EVCC module (12).

[0099] At this time, the SECC module (22) is configured to communicate with the EVCC module (12) in the charging standby state of the electric vehicle (10) to diagnose the cause of the abnormal state. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time period greater than a threshold. In addition, the SECC module (22) is configured to retry detecting the abnormal state by communicating with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times less than a threshold and has been maintained for a time period less than a threshold.

[0100] According to one embodiment of the present invention, the SECC module (22) can detect in real time whether there is a foreign substance on the wireless charging transmitter (21) through the foreign substance detection sensor (21-2) built into the wireless charging transmitter (21) and perform an analysis. When charging starts, the SECC module (22) can activate the foreign substance detection sensor (21-2) to continuously monitor the state of the surface of the wireless charging transmitter (21). Here, the SECC module (22) can analyze a change in an electromagnetic signal detected around the wireless charging transmitter (21) and determine whether there is a conductive material such as a metal object such as a coin, a key, or a clip. In addition, the SECC module (22) can measure a temperature change on the surface of the wireless charging transmitter (21) and determine whether the detected temperature increase occurred during a normal charging process or was caused by overheating due to a foreign substance.

[0101] Error level detection execution step (S210)

[0102] Grade B classification stage (S210-1)

[0103] According to one embodiment of the present invention, if the SECC module (22) determines that the detected abnormal state has a serious error level that requires immediate termination of charging, the SECC module (22) can classify the error level as Grade A (S210-2), and if the SECC module (22) determines that the detected abnormal state has a minor error level that is not at a level that requires immediate termination of charging, the SECC module (22) can classify the error level as Grade B (S210-1). Specifically, the SECC module (22) can classify the nature of the foreign matter based on the collected data. For example, if the foreign matter is a non-conductive material such as dust, or is determined to be a minor level that does not affect charging efficiency or safety, the SECC module (22) can classify the error level as Grade B.

[0104] According to one embodiment of the present invention, the SECC module (22) can classify the error level as Grade B and transmit a signal to the EVCC module (12) to maintain the charging state on the vehicle side by flowing only a small amount of current. Accordingly, since the electric vehicle (10) still maintains the charging state, the present invention can provide an effect in which the wireless charging of the electric vehicle (10) is not interrupted in the case of an abnormal state having an error level of Grade B. In this case, the SECC module (22) can transmit a notification to the EVCC module (12), and the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to provide a user interface that displays a warning message to the user to urge caution. Thereafter, the SECC module (22) can control the wireless charging system (100) to resume charging.

[0105] That is, if the abnormal state detected in the diagnosis execution step (S230) is determined to be a minor abnormal state and the abnormal state is detected less than a threshold number of times, the SECC module (22) can perform the Recovery process step (S230-1). For example, if a non-conductive material is detected for the first time, the SECC module (22) can control the charger (20) or the electric vehicle (10) to perform the Recovery process step (S230-1) so that the wireless charging system (100) can perform the abnormal state detection step (S200) again. For a specific example, the SECC module (22) can transmit a notification to the EVCC module (12), and accordingly, the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to provide a user interface such as "Please dust the bottom of the vehicle" to the user. Accordingly, if the user removes dust from the bottom of the vehicle, the SECC module (22) can perform the Recovery process step (S130-1) to control the wireless charging system (100) to perform the abnormal state detection step (S100) again. However, even if the user does not remove dust from the bottom of the vehicle, since there is no abnormality in supplying power, the wireless charging system (100) can continue to supply power without interruption.

[0106] Grade A classification stage (S210-2)

[0107] If the SECC module (22) determines that the detected abnormal condition has a serious error level that requires immediate termination of charging, it can classify the error level as Grade A (S210-2). If the SECC module (22) determines that the detected abnormal condition has a minor error level that is not so serious that requires immediate termination of charging, it can classify the error level as Grade B (S210-1). Specifically, the SECC module (22) can classify the nature of the foreign substance based on the collected data. For example, if the foreign substance is detected as a conductive material such as metal, or if the cause of overheating is clearly determined to be a foreign substance, the SECC module (22) can classify the error level as Grade A (S210-2). At this time, the SECC module (22) can notify the EVCC module (12) of this, and the EVCC module (12) can control the display unit (13) of the electric vehicle (10) to output a message saying, "Please remove the foreign substance from the charging pad," so as to request the user to directly resolve the problem. In this case, since the cause of overheating is clearly identified as a foreign substance, the SECC module (22) can immediately terminate charging and perform a communication failure current supply interruption step (S240) that terminates communication with the EVCC module (12).

[0108] FIG. 5 is a diagram for explaining an embodiment of requesting a vehicle to maintain a charging standby state by detecting an error level after a communication-capable current supply interruption step according to one embodiment of the present invention.

[0109] The present invention can provide an electric vehicle (10) that operates to maintain a charging standby state when an abnormal state is detected during wireless charging by a charger (20) or an electric vehicle (10). Specifically, the electric vehicle (10) according to the present invention can include an EVCC module (12) that communicates with an SECC module (22) of a charger (20) and controls a wireless charging state, a receiving coil (11-1) that receives power from the charger (20), a battery pack (15) that stores the received power, and a BMS module (14) that controls a charging state of the battery pack (15). Specifically, the EVCC module (12) is configured to switch the electric vehicle (10) to a charging standby state when it receives a request signal to maintain a charging standby state from the SECC module (22).

[0110] According to one embodiment of the present invention, when the EVCC module (12) receives a request signal for maintaining a charge standby state from the SECC module (22), the EVCC module (12) is configured to control the BMS module (14) to stop supplying current to the battery pack (15). In addition, the EVCC module (12) may be configured to communicate with the SECC module (22) in the charge standby state to diagnose the cause of an abnormal state. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the EVCC module (12) may be configured to stop communication with the SECC module (22) when it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time greater than a threshold. In addition, the EVCC module (12) is configured to communicate with the SECC module (22) to retry detecting the abnormal condition if it is determined that the abnormal condition detected by the cause of the diagnosed abnormal condition is at least one of being detected a number of times below a threshold and being maintained for a time below a threshold.

[0111] According to the present invention, a charger (20) configured to communicate with an electric vehicle (10) to detect an abnormal state during wireless charging and maintain a charging standby state of the electric vehicle (10) can be provided. Specifically, the charger (20) includes a SECC module (22) that communicates with the electric vehicle (10) and controls a charging state, a transmission coil (21-1) that transmits power to the electric vehicle (10), and a wireless charging transmitter (21) that controls power supplied to the transmission coil (21-1). Here, when the SECC module (22) detects an abnormal state of the electric vehicle (10) or receives abnormal state detection information from the EVCC module (12) of the electric vehicle (10), the SECC module (22) controls the wireless charging transmitter (21) to stop supplying power to the transmission coil (21-1) and transmits a charging standby state maintenance request signal to the EVCC module (12).

[0112] At this time, the SECC module (22) is configured to communicate with the EVCC module (12) in the charging standby state of the electric vehicle (10) to diagnose the cause of the abnormal state. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times greater than a threshold. In addition, the SECC module (22) is configured to stop communication with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected for a time period greater than a threshold. In addition, the SECC module (22) is configured to retry detecting the abnormal state by communicating with the EVCC module (12) if it is determined that the abnormal state detected by the cause of the diagnosed abnormal state has been detected a number of times less than a threshold and has been maintained for a time period less than a threshold.

[0113] Abnormal condition detection step (S300)

[0114] According to one embodiment of the present invention, the EVCC module (12) can regularly receive status information of the battery pack (15) from the BMS (Battery Management System) module (14) of the electric vehicle (10) in the abnormal status detection step (S300). Here, the status information of the battery pack that the EVCC module (12) receives from the BMS module (14) may include voltage, current, temperature, state of charge (SOC), and internal resistance value of individual cells. In addition, the EVCC module (12) can analyze whether there is an imbalance between cells by checking the voltage difference between individual cells, and if the voltage difference between cells exceeds the allowable range, it can determine that there is a cell imbalance. In addition, the EVCC module (12) can evaluate whether the SOC (State of Charge) of the battery pack (15) exceeds a set upper limit, and can analyze the possibility that the temperature of the battery pack (15) may rapidly increase due to overcharging through BMS data.

[0115] Communication current supply interruption stage (S310)

[0116] According to one embodiment of the present invention, the EVCC module (12) can check the voltage difference between individual cells, and if the voltage difference between cells exceeds a threshold range, it can perform a communication-enabled current supply interruption step (S310). In this case, the EVCC module (12) and the SECC module (22) can still communicate, but the SECC module (22) can control the wireless charging transmitter (21) to command the interruption of current supply so that the current supply is no longer performed. In addition, the EVCC module (12) can control the BMS module (14) to interrupt the current supply so that the battery pack (15) is no longer supplied with current from the wireless charging transmitter (21).

[0117] Error level detection step (S320)

[0118] Grade B classification stage (S320-1)

[0119] According to one embodiment of the present invention, in case of a minor cell imbalance problem, the EVCC module (12) can classify the detected abnormal condition as an error level of Grade B (S320-1). In addition, the EVCC module (12) can perform a request (S330) to maintain the vehicle's charging standby state through the SECC module (22). Accordingly, the SECC module (22) can transmit a signal to the EVCC module (12) to maintain the charging standby state of the electric vehicle (10), and the electric vehicle (10) maintains the charging standby state.

[0120] According to one embodiment of the present invention, while the electric vehicle (10) maintains a charging standby state, the EVCC module (12) can transmit a cell balancing command to the BMS module (14) through a diagnosis execution step (S340), and the BMS module (14) can adjust the voltage between individual cells. Here, the cell balancing can be performed by consuming the energy of a high voltage cell using a resistor or additionally charging a low voltage cell. In this case, since the user does not need to know the troubleshooting process, the BMS module (14) can provide a user interface such as "Optimizing the battery status. Charging is in progress normally" on the display unit (13). Accordingly, when the voltage between individual cells is adjusted, the EVCC module (12) can perform a recovery process step (S340-1) to control the wireless charging system (100) to perform the abnormal state detection step (S300) again. However, even if the voltage between individual cells is not adjusted, the wireless charging system (100) can resume supplying power since it is not a serious overcharge risk condition in which there is no problem in supplying power.

[0121] Grade A classification stage (S320-2)

[0122] According to one embodiment of the present invention, in the case of a serious overcharge risk state, the EVCC module (12) can classify the detected abnormal state into an error level (S320-2) of Grade A. For example, if the SOC of the battery pack (15) exceeds the safety limit or the battery pack temperature rises rapidly, the EVCC module (12) can classify the detected abnormal state into an error level (S320-2) of Grade A. At this time, the EVCC module (12) can provide a user interface such as "Warning: Battery overcharge risk detected. Vehicle inspection is required" through the display unit (13) so that the user can take immediate action. In this case, since it is a case of a serious overcharge risk, the wireless charging system (100) can immediately perform a communication failure current supply interruption step (S140) to stop charging.

[0123] FIG. 6 is a drawing for explaining an embodiment of a step of temporarily replacing a link cap power supply in a UPS according to one embodiment of the present invention.

[0124] As illustrated in FIG. 6, when the charger (20) detects an abnormal condition such as overcurrent, overheating, or voltage instability (S400), the SECC module (22) activates the UPS (Uninterruptible Power Supply) module (23) to temporarily replace the power supply that the existing link capacitor (24) was responsible for. Specifically, the link capacitor (24) plays a role in stabilizing power quality during charging, but when an abnormal condition occurs, it can no longer perform a stable energy supply, so the SECC module (22) activates the UPS module (23) to temporarily replace the power supply that the existing link capacitor (24) was responsible for. At this time, the UPS module (23) can supply a small amount of power to the wireless charging system (100) through the battery pack (15) or internally stored energy. Accordingly, the present invention can protect the entire wireless charging system (100) from abnormal shutdown by replacing the link capacitor (24) with the UPS module (23), even in an abnormal state. In addition, since the present invention supplies energy through the UPS module (23), it can provide the effect of quickly resuming the charging process when the abnormal state is resolved.

[0125] FIG. 7 is a diagram showing a power conversion flow of a wireless charging system and a connection structure for UPS or external power support according to one embodiment of the present invention.

[0126] As illustrated in FIG. 7, the wireless charging system (100) can receive AC power from an external AC power source (AC grid), such as a power grid or a generator. Accordingly, the AC voltage can be converted into DC through an AC / DC converter (AC / DC) that converts AC power into DC power. Thereafter, the link capacitor (24) can reduce voltage and current ripple and store the DC power output from the AC / DC converter (AC / DC). Thereafter, the DC / DC converter (DC / DC prim 1) can convert the DC power supplied from the link capacitor (24) into a voltage / current that can be used in the wireless charging coil (Coil 1). At this time, the wireless charging coil (Coil 1) corresponds to a transmitting coil (21-1) that transmits energy for wireless charging, and can perform the role of transmitting energy supplied from a DC / DC converter (DC / DC prim 1) to a receiving coil (11-1) of an electric vehicle (10) through a magnetic field.

[0127] As illustrated in FIG. 7, an Uninterruptible Power Supply (UPS) or external power supply can provide temporary power when the external power (AC Grid) is unstable or interrupted. Specifically, when the external power is interrupted or unstable, the UPS module (23) directly supplies power to the link capacitor (24) to prevent the wireless charging system (100) from being interrupted.

[0128] The scope of the present invention is not limited to the embodiments described above, but can be implemented in various forms within the scope of the appended claims. It is contemplated that the scope of the claims encompasses various modifications that can be made by anyone skilled in the art without departing from the spirit of the invention as claimed.

[0129] [Explanation of symbols]

[0130] 10: Electric vehicles

[0131] 11: Wireless charging receiver

[0132] 11-1: Receiver coil

[0133] 12: EVCC module

[0134] 13: Display section

[0135] 14: BMS module

[0136] 15: Battery pack

[0137] 16: Temperature sensor

Claims

1. In the case where an abnormal condition is detected during wireless charging by the charger or electric vehicle, in the case of an electric vehicle that operates to maintain a charging standby state, An EVCC module that communicates with the SECC module of the above charger and controls the wireless charging status; A receiving coil for receiving power from the charger; A battery pack for storing the received power; and A BMS module that controls the charging status of the battery pack; The above EVCC module When a request signal to maintain a charging standby state is received from the above SECC module, configured to switch the electric vehicle to the charging standby state, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

2. In paragraph 1, The above EVCC module When a request signal to maintain a charging standby state is received from the above SECC module, configured to control the BMS module to stop the current supply to the battery pack, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

3. In paragraph 1 or 2, The above EVCC module, By communicating with the SECC module in the above charging standby state, Configured to diagnose the cause of the above abnormal condition, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

4. In paragraph 3, The above EVCC module, If it is determined that the abnormal condition detected by the cause of the above diagnosed abnormal condition has been detected more than a critical number of times, configured to stop communication with the above SECC module, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

5. In paragraph 3, The above EVCC module, If it is determined that the abnormal condition detected by the cause of the above diagnosed abnormal condition has been detected for a time exceeding the critical value, configured to stop communication with the above SECC module, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

6. In paragraph 3, The above EVCC module, If the abnormal condition detected by the cause of the above diagnosed abnormal condition is judged to be at least one of the following: detected a number of times less than the threshold and maintained for a time less than the threshold; Configured to communicate with the SECC module and retry detecting an abnormal condition, An electric vehicle that operates to maintain a charging standby state when an abnormal condition is detected during wireless charging by a charger or electric vehicle.

7. A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state. SECC module that communicates with the electric vehicle and controls the charging status; A transmitting coil for transmitting power to the electric vehicle; and A wireless charging transmitter that controls power supplied to the above-mentioned transmitting coil; The above SECC module, When an abnormal condition of the above electric vehicle is detected or abnormal condition detection information is received from the EVCC module of the above electric vehicle, Controlling the wireless charging transmitter to stop supplying power to the transmitter coil, Configured to transmit a request signal to maintain a charging standby state to the above EVCC module, A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state.

8. In paragraph 7, The above SECC module, Communicate with the EVCC module while the electric vehicle is in a charging standby state, Configured to diagnose the cause of the above abnormal condition, A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state.

9. In paragraph 7, The above SECC module, If it is determined that the abnormal condition detected by the cause of the above diagnosed abnormal condition has been detected more than a critical number of times, configured to stop communication with the above EVCC module, A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state.

10. In paragraph 7, The above SECC module, If it is determined that the abnormal condition detected by the cause of the above diagnosed abnormal condition has been detected for a time exceeding the critical value, configured to stop communication with the above EVCC module, A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state.

11. In paragraph 7, The above SECC module, If the abnormal condition detected by the cause of the above diagnosed abnormal condition is judged to be at least one of the following: detected a number of times less than the threshold and maintained for a time less than the threshold; Configured to communicate with the above EVCC module and retry detecting an abnormal condition, A charger configured to communicate with an electric vehicle to detect an abnormal condition during wireless charging and maintain the electric vehicle in a charging standby state.

12. In the event that an abnormal condition is detected during wireless charging by the charger or electric vehicle, in the case of an electric vehicle that can maintain the charging state, An EVCC module that communicates with the SECC module of the above charger and controls the wireless charging status; A receiving coil for receiving power from the charger; A battery pack for storing the received power; and A BMS module that controls the charging status of the battery pack; The above EVCC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having a level of error below the critical level, configured to maintain the charging state of the electric vehicle, An electric vehicle capable of maintaining a charging state when an abnormal condition is detected during wireless charging by the charger or the electric vehicle.

13. In paragraph 12, The above EVCC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having an error level higher than the critical level, configured to control the BMS module to stop supplying current to the battery pack; An electric vehicle capable of maintaining a charging state when an abnormal condition is detected during wireless charging by the charger or the electric vehicle.

14. In the event that an abnormal condition is detected during wireless charging by the charger or the electric vehicle, in the case of the electric vehicle that can maintain the charging state, An EVCC module that communicates with the SECC module of the above charger and controls the wireless charging status; A receiving coil for receiving power from the charger; A battery pack for storing the received power; and A BMS module that controls the charging status of the battery pack; The above EVCC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having a level of error below the critical level, configured to receive a request signal to maintain a charging standby state from the SECC module and switch the electric vehicle to the charging standby state. An electric vehicle capable of maintaining a charging state when an abnormal condition is detected during wireless charging by the charger or the electric vehicle.

15. In paragraph 14, The above EVCC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having an error level higher than the critical level, configured to control the BMS module to stop supplying current to the battery pack; An electric vehicle capable of maintaining a charging state when an abnormal condition is detected during wireless charging by the charger or the electric vehicle.

16. In a charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle, SECC module that communicates with the electric vehicle and controls the charging status; A transmitting coil for transmitting power to the electric vehicle; and A wireless charging transmitter that controls power supplied to the above-mentioned transmitting coil; The above SECC module, When an abnormal condition of the above electric vehicle is detected or abnormal condition detection information is received from the EVCC module of the above electric vehicle, It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having a level of error below the critical level, configured to transmit a charge status maintenance request signal to the above EVCC module, A charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle.

17. In paragraph 16, The above SECC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having an error level higher than the critical level, configured to control the wireless charging transmitter to stop power supplied to the transmitter coil, A charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle.

18. In a charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle, SECC module that communicates with the electric vehicle and controls the charging status; A transmitting coil for transmitting power to the electric vehicle; and A wireless charging transmitter that controls power supplied to the above-mentioned transmitting coil; The above SECC module, When an abnormal condition of the above electric vehicle is detected or abnormal condition detection information is received from the EVCC module of the above electric vehicle, It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having a level of error below the critical level, Configured to transmit a request signal to maintain a charging standby state to the above EVCC module, A charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle.

19. In paragraph 18, The above SECC module It is configured to perform classification of the abnormal state based on the level of error of the detected abnormal state, If the above classified abnormal condition is classified as having an error level higher than the critical level, configured to control the wireless charging transmitter to stop power supplied to the transmitter coil, A charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle.

20. In a charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle, SECC module that communicates with the electric vehicle and controls the charging status; A transmitting coil for transmitting power to the electric vehicle; A wireless charging transmitter that controls power supplied to the above-mentioned transmitting coil; a link capacitor for supplying power to the above transmitting coil; and A UPS module capable of replacing the power supply of the above link capacitor; The above UPS module, When the SECC module detects an abnormal condition of the electric vehicle or the SECC module receives abnormal condition detection information from the EVCC module of the electric vehicle, Configured to temporarily replace the power supply of the above link capacitor, A charger configured to maintain the charging state of an electric vehicle when an abnormal condition of the electric vehicle is detected during wireless charging by communicating with the electric vehicle.

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