Pcs-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal

Abstract

The application provides a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal, a charging pile is used to constitute a PCS to charge and discharge a battery of a battery swap station, and before the battery and the charging pile interact, each of them is closed after insulation detection of the battery, then the PCS charging pile performs global DC loop insulation detection, and leakage current detection is performed on each DC loop, beneficial effects of improving the efficiency of the charging and discharging system, adapting to a traditional transformer and solving the problem of multi-battery parallel connection are achieved, and technical problems such as low efficiency of an existing battery swap station and difficulty in multi-battery parallel connection are solved.

Description

Technical Field

[0001] This invention relates to the field of insulation testing, and in particular to a PCS-based multi-cell non-isolated insulation testing system, method, medium, program product, and terminal. Background Technology

[0002] In the fields of multi-battery energy storage and power management, with the rapid development of electric vehicles and renewable energy, energy exchange and control technologies between batteries and the power grid are receiving increasing attention. However, some significant shortcomings in existing technologies restrict the efficient application of multi-battery systems.

[0003] Most current systems use unidirectional AC / DC isolation modules for battery charging. Although peak efficiency can reach 95%, these unidirectional modules severely limit system flexibility, especially in terms of switching between grid-connected and off-grid operation. Furthermore, the unidirectional AC / DC modules commonly used in battery swapping stations not only have low efficiency but also cannot perform reverse grid interaction. This affects the overall system efficiency and functionality. In addition, standard transformers cannot meet the dynamic power supply requirements of multi-battery systems. Therefore, specially designed multi-winding transformers must be used, increasing the overall transformer cost by approximately 50%. While bidirectional AC / DC isolation modules can also achieve 95% efficiency, their high price limits their widespread market application, further exacerbating the cost-efficiency trade-off. Moreover, when multi-battery systems are connected in parallel and integrated with PCS charging piles, mutual interference between the battery insulation detection balance bridges leads to false drops in insulation detection resistance, increasing complexity and affecting system reliability. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal to solve the problems of insufficient flexibility of unidirectional AC / DC isolation modules, the inability of standard transformers to be connected in parallel to the grid or off-grid through PCS, the high cost of bidirectional AC / DC modules and the need for special multi-winding transformers for multi-battery systems.

[0005] To achieve the above and other related objectives, a first aspect of the present invention provides a method for a multi-cell non-isolated insulation detection system based on a PCS (Polymer Processing System). The system includes multiple pairs of paired PCS non-isolated charging / discharging devices and battery cells. The interaction process between each pair of PCS non-isolated charging / discharging devices and the battery cell includes: upon receiving a charging command, the PCS non-isolated charging / discharging device sends a wake-up message to the battery cell to initiate the current charging / discharging sequence; the battery cell continuously receives the wake-up message, and upon receiving the wake-up message, initiates a first insulation detection at the battery cell end; subsequently, the battery cell and the PCS non-isolated charging / discharging device begin... Handshake process; In response to the successful handshake process, the battery cell generates a corresponding first detection result based on the detection result of the first insulation detection, sends the first detection result to the PCS non-isolated charging and discharging device, and closes the first insulation detection; In response to the successful handshake process, the PCS non-isolated charging and discharging device continues to receive the first detection result. If the first detection result is passed, the second grounding detection at the PCS non-isolated charging and discharging device end is activated. After the second grounding detection is passed, a circuit closing operation is performed to perform non-isolated charging and discharging operation. At the same time, the third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation ends.

[0006] In some embodiments of the first aspect of the present invention, the process of initiating a handshake procedure between the battery cell and the PCS non-isolated charging and discharging device includes: the PCS non-isolated charging and discharging device sending a first message to the battery cell at a preset period, while the battery cell continuously receives the first message; after the battery cell receives the first message, it sends a second message to the PCS non-isolated charging and discharging device at a preset period, while the PCS non-isolated charging and discharging device continuously receives the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery cell within a preset time, the handshake procedure is successful.

[0007] In some embodiments of the first aspect of the present invention, the process of the battery cell generating a corresponding first detection result based on the detection result of the first insulation detection and sending the first detection result to the PCS non-isolated charging and discharging device includes: if the detection result of the first insulation detection is a failure, the battery cell generates a third message as the first detection result, sends the third message to the PCS non-isolated charging and discharging device, and terminates the charging and discharging sequence of the current round; if the detection result of the first insulation detection is a pass, the battery cell generates a fourth message as the first detection result and sends the fourth message to the PCS non-isolated charging and discharging device.

[0008] In some embodiments of the first aspect of the present invention, if the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery cell within a preset time, the system further performs the following interaction process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging instruction.

[0009] In some embodiments of the first aspect of the present invention, if the PCS non-isolated charging and discharging device fails to receive the second message sent back by the battery cell within a preset time, the handshake process fails, and the system further performs the following interaction process: in response to the failure of the handshake process, the battery cell performs an isolated charging and discharging operation; in response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed; if it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging instruction.

[0010] To achieve the above and other related objectives, a second aspect of the present invention provides a multi-cell non-isolated insulation detection method based on a PCS (Polymer Processing System). The method is applied to a PCS non-isolated charging and discharging device. The method includes: upon receiving a charging command, sending a wake-up message to the battery cell to initiate the current round of charging and discharging sequence; subsequently initiating a handshake process with the battery cell; in response to a successful handshake process, continuously receiving the first detection result; if the first detection result is passed, then initiating a second grounding detection at the PCS non-isolated charging and discharging device end; after the second grounding detection passes, performing a circuit closure operation to execute a non-isolated charging and discharging operation, and simultaneously performing a third insulation detection of the charging and discharging circuit until the non-isolated charging and discharging operation ends.

[0011] To achieve the above and other related objectives, a third aspect of the present invention provides a multi-cell non-isolated insulation detection method based on a PCS, the method being applied to a battery cell, the method comprising: continuously receiving a wake-up message, and upon receiving the wake-up message, activating a first insulation detection at the battery cell end; initiating a handshake process with the PCS non-isolated charging and discharging device; in response to the successful handshake process, generating a corresponding first detection result based on the detection result of the first insulation detection, sending the first detection result to the PCS non-isolated charging and discharging device, and deactivating the first insulation detection.

[0012] To achieve the above and other related objectives, a fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method.

[0013] To achieve the above and other related objectives, a fifth aspect of the present invention provides a computer program product comprising computer program code that, when executed on a computer, causes the computer to implement the method.

[0014] To achieve the above and other related objectives, a sixth aspect of the present invention provides an electronic terminal, including a memory, a processor, and a computer program stored in the memory; the processor executes the computer program to implement the method.

[0015] As described above, the PCS-based multi-cell non-isolated insulation detection system, method, medium, program product, and terminal of the present invention have the following beneficial effects: They significantly improve the overall efficiency of the charging and discharging system, overcoming the limitations of low efficiency in traditional isolation modules, increasing the system's peak efficiency from 95% to 98%, and ensuring more efficient and reliable charging and discharging operations. Simultaneously, they effectively solve the technical challenges of multi-cell parallel operation, achieving safe and reliable parallel operation of multiple cells. Furthermore, this solution is compatible with traditional transformers, eliminating the need for multi-winding special transformers, reducing transformer costs by approximately 50%, and significantly reducing the overall system investment cost. Therefore, the present invention not only improves system energy efficiency but also significantly reduces operating costs, providing an economical and efficient solution for a wider range of applications. Attached Figure Description

[0016] Figure 1 The diagram shows an interactive process of an embodiment of the PCS-based multi-cell non-isolated insulation detection system of the present invention.

[0017] Figure 2 The diagram shows a flowchart illustrating the interaction process of another embodiment of the PCS-based multi-cell non-isolated insulation detection system of the present invention.

[0018] Figure 3 The diagram shows a flowchart of an embodiment of the PCS non-isolated charging and discharging device method for multi-cell non-isolated insulation detection based on PCS according to the present invention.

[0019] Figure 4 The diagram shows a flowchart of an embodiment of the battery cell method for multi-cell non-isolated insulation detection based on PCS of the present invention.

[0020] Figure 5 The diagram shows a structural schematic of an embodiment of the PCS-based multi-battery non-isolated insulation detection terminal of the present invention. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] Before providing a further detailed description of the present invention, the nouns and terms used in the embodiments of the present invention are explained, and the nouns and terms used in the embodiments of the present invention are subject to the following interpretations:

[0023] <1> PCS (Power Conversion System): A power conversion system refers to a bidirectional power electronic device responsible for converting between alternating current (AC) and direct current (DC) in electric drive and energy storage applications, including rectification and inversion functions. PCS plays a crucial role in electric vehicle charging, energy storage systems, and renewable energy grid connection, and typically includes power modules, control units, and protection circuits.

[0024] <2> Non-isolated: This refers to a circuit design that does not use isolation components such as transformers or optocouplers to achieve electrical isolation. This design typically has the advantages of simple structure and high efficiency, but it has more stringent requirements for system grounding and safety protection, and may increase the risk of failure.

[0025] <3> Insulation testing: a technique used to monitor the insulation condition within a power system, ensuring the effectiveness of insulation between high-voltage and low-voltage sections or grounding. Its purpose is to prevent safety accidents caused by insulation failure. Insulation testing typically employs methods such as resistance measurement and balanced bridge testing to ensure the safe operation of equipment.

[0026] <4> A+A- signal: A control signal used to wake up a power system or equipment, typically indicating the positive and negative polarities of a DC signal. This signal transmits commands during system startup and control to ensure that the equipment is in the correct operating state.

[0027] <5> Handshake process: In a communication protocol, this is the process used to establish, confirm, and maintain a connection. During the handshake, the two communicating parties confirm each other's status and communication parameters by exchanging specific signals or data packets, ensuring the reliability and effectiveness of subsequent data transmission.

[0028] <6> Pre-charge process: In order to avoid excessive instantaneous current surges to the system when power electronic equipment or batteries are charging or discharging, the pre-charge process in DC systems first charges the bus capacitor with a low current, and then closes the main contactor after the voltage reaches the preset value, so as to protect the system components.

[0029] <7> J1939 Protocol: A CAN bus-based communication protocol designed specifically for commercial vehicles and off-road machinery. The J1939 protocol specifies data transmission formats, message priorities, and network management, facilitating efficient interconnection and communication between different electronic control units.

[0030] <8> DC contactor: A high-power electromagnetic switch specifically designed for controlling the on / off state of DC circuits. DC contactors are widely used in electric vehicle charging systems, energy storage systems, and other high-current DC power systems to achieve precise current control.

[0031] <9> K1K2 switch: refers to the switch connecting the charging / discharging device and the battery cell, typically consisting of two relays or contactors. The K1K2 switch controls the flow of current, ensuring the battery's safety and efficient energy management during charging and discharging.

[0032] The PCS-based multi-cell non-isolated insulation detection system, method, medium, program product, and terminal of this invention are applicable to scenarios such as the operation, maintenance, and safety monitoring of large-scale energy storage systems, electric vehicle battery packs, and other high-voltage battery packs. This invention enables rapid and accurate detection of the insulation status of multiple battery cells without the need for isolation, thereby effectively improving detection efficiency, reducing maintenance costs, and enhancing the safety and reliability of the battery system.

[0033] It should be noted that existing battery insulation testing technologies mainly employ two methods: one is to install an isolation module at the battery end for testing. While this method achieves isolation, it increases system cost and complexity, and each battery cell requires a separate isolation module, significantly raising costs. The second method uses a custom-designed multi-winding transformer to achieve isolation control at the transformer end. However, this also faces high customization costs, and the complex transformer structure increases system size and weight, while also increasing the difficulty of testing and making the process cumbersome. Both methods suffer from high costs, complex testing processes, and cumbersome judgment, limiting their widespread application in large battery packs.

[0034] This invention eliminates the need for additional isolation modules or custom transformers. Before interaction with the national standard charging and discharging communication protocol, it coordinates the charging and discharging equipment and the battery cells to perform self-diagnostic insulation tests. Once the test results are confirmed to be correct, it controls the battery cells to shut down their own testing via communication commands, while simultaneously enabling the insulation test on the charging and discharging equipment side. This allows for real-time monitoring of the leakage current in the entire DC circuit, achieving effective monitoring of the battery pack's insulation status. This replaces traditional battery insulation testing schemes based on isolation modules or special transformers. Based on the PCS charging and discharging equipment, this invention increases the peak efficiency of existing AC / DC conversion systems from 95% to 98%.

[0035] To facilitate understanding of the embodiments of the present invention, firstly, in conjunction with Figure 1 Detailed explanation. Figure 1 This invention presents a schematic flowchart of a PCS-based multi-cell non-isolation insulation detection system according to an embodiment of the present invention. Figure 2 This document illustrates a flowchart of a PCS-based multi-cell non-isolated insulation detection system according to another embodiment of the present invention. In this embodiment, the PCS-based multi-cell non-isolated insulation detection system includes multiple pairs of paired PCS non-isolated charging / discharging devices and battery cells. The interaction process between each pair of PCS non-isolated charging / discharging devices and the battery cell mainly includes the following steps:

[0036] Step S11: After receiving the charging command, the PCS non-isolated charging and discharging device sends a wake-up message to the battery cell to start the charging and discharging sequence of the current round; the battery cell continuously receives the wake-up message, and after receiving the wake-up message, it enables the first insulation detection at the battery cell end, and then the battery cell and the PCS non-isolated charging and discharging device start the handshake process.

[0037] In one embodiment of the present invention, the PCS non-isolated charging and discharging device employs power electronic conversion technology (PCS) to directly convert AC to DC power, eliminating the need for a traditional AC / DC isolation transformer. This results in a simpler system structure, lower cost, smaller size, and higher efficiency. However, due to the lack of an isolation transformer, safety is lower. Therefore, the insulation detection scheme of the present invention can greatly improve the safety of the PCS non-isolated charging and discharging device.

[0038] In one embodiment of the present invention, the battery cell includes a power unit. The power battery is a high-energy-density battery used in electric vehicles, hybrid vehicles, power tools, and energy storage systems, characterized by high discharge current. The power battery typically consists of multiple battery cells forming a battery pack and is equipped with a battery management system (BMS) to monitor battery status and manage charging and discharging. The power battery can be a lithium-ion battery (e.g., lithium iron phosphate and ternary lithium batteries), lead-acid and nickel-metal hydride batteries, solid-state batteries, and sodium-ion batteries, etc.

[0039] In one embodiment of the present invention, after receiving a charging command, the PCS non-isolated charging and discharging device sends a wake-up message to the battery cell to initiate the current round of charging and discharging sequence. The wake-up message uses an A+A- wake-up signal. The A+A- wake-up signal consists of two consecutive A signals and a subsequent negative pulse signal. The A signals can be any predefined signal type (e.g., a specific voltage level or pulse), and are repeated twice to enhance reliability. The negative pulse signal "-" marks the end of the wake-up signal, avoiding conflicts with other signals and ensuring smooth subsequent data reception.

[0040] In one embodiment of the present invention, the charge-discharge sequence refers to the complete time sequence in which the PCS device and the battery cell coordinate to complete the charging or discharging process, including: the charging sequence is the time sequence in which the PCS charging and discharging device and the battery cell coordinate to complete a complete charging process, including wake-up communication, multiple insulation detection, pre-charging, constant current charging, constant voltage charging, charging completion and post-charging status monitoring, etc.

[0041] In one embodiment of the present invention, the process of initiating a handshake between the battery cell and the PCS non-isolated charging and discharging device includes: the PCS non-isolated charging and discharging device sending a first message to the battery cell at a preset period, while the battery cell continuously receives the first message; after receiving the first message, the battery cell sending a second message to the PCS non-isolated charging and discharging device at a preset period, while the PCS non-isolated charging and discharging device continuously receives the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery cell within a preset time, the handshake process is successful.

[0042] like Figure 2 As shown, the PCS non-isolated charging and discharging device sends a first message to the battery cell to enable vehicle-side ground detection at a period of 250ms, and determines whether it receives a second message from the battery cell within a preset time. For example, the preset time can be set to continuously monitor the second message within 30s from the time the first message is sent. If the second message is not received within 30s, the handshake process is determined to have failed.

[0043] In one embodiment of the present invention, the message uses a unique Parameter Group Number (PGN) from the J1939 protocol to identify the message type and content. The first, second, third, and fourth messages contain the following fields: Msgid (hexadecimal message ID, used to uniquely identify the message type), DLC (Data Length Code, indicating the length of the message data portion), Sender (Sender ID, identifying the message's sending source), Cycle Time (Message Period, indicating the frequency of message transmission), Signal Name (Signal Name, describing the meaning of each signal in the message), StartBit (Start Bit, indicating the starting position of the signal in the message), Length (Signal Length, indicating the number of bits occupied by the signal), Receiver (Receiver ID, identifying the message's receiving target), and VALTable (Value Table, defining the meaning of signal values). These fields collectively describe the message's structure, content, sending and receiving information, and the specific meaning of the signals. For example, the first message is PGN0x005500, data00x02. The second message is PGN 0x005600, bits 0-10x02, bits 2-30x01, bits 3-40x03. The third message is PGN 0x005600, bits 0-10x01, bits 2-30x02, bits 3-40x02. The fourth message is PGN 0x005600, bits 0-10x01, bits 2-30x02, bits 3-40x01.

[0044] Further, Table 1 illustrates the message structure in this embodiment of the invention. It uses the unique parameter group number (PGN) from the J1939 protocol to identify the message type and content. Message 1, with ID 0x1855F456, is sent by the discharge unit, has a data length code (DLC) of 8 bytes, and a transmission period of 100 milliseconds. The signal "Request BMS to disable insulation detection" has a start bit of 0 and a length of 2 bits in the message, is received by the BMU, and its value table (VALTable) is defined as: 0 indicates reservation, 1 indicates no request, 2 indicates requesting the BMS to disable insulation, and 3 indicates invalid. Message 2, with ID 0x185656F4, is sent by the BMU, has a data length code of 8 bytes, and a transmission period of 100 milliseconds. The signal "BMS current insulation status" has a start bit of 0 and a length of 2 bits in the message, is received by the discharge unit, and its value table (VALTable) is defined as: 0 indicates reservation, 1 indicates insulation disabled, 2 indicates insulation enabled, and 3 indicates invalid. In data frame 3 with ID 0x185656F4, the signal "BMS insulation test completion flag" has a starting bit of 2 and a length of 2 bits. The receiver is the discharge device, and the value table (VALTable) for this signal is: 0 indicates reserved, 1 indicates incomplete, 2 indicates complete, and 3 indicates invalid. In data frame 4 with ID 0x185656F4, the signal "BMS current insulation test fault flag" has a starting bit of 4 and a length of 2 bits. The receiver is the discharge device, and its value table (VALTable) is defined as: 0 indicates reserved, 1 indicates normal, 2 indicates fault, and 3 indicates invalid.

[0045] Message ID DLC sender Message cycle Signal name LSE length Receiver 0x1855F456 8 Discharge machine 100 Request BMS to disable insulation detection 0 2 BMU 0x185656F4 8 BMU 100 BMS current insulation status 0 2 Discharge machine 0x185656F4 8 BMU 100 BMS insulation test completion flag 2 2 Discharge machine 0x185656F4 8 BMU 100 BMS current insulation detection fault flag bit 4 2 Discharge machine

[0046] Table 1: Message Structure in Embodiments of the Invention

[0047] Step S12: In response to the successful handshake process, the battery cell generates a corresponding first detection result based on the detection result of the first insulation detection, sends the first detection result to the PCS non-isolated charging and discharging device, and turns off the first insulation detection.

[0048] In one embodiment of the present invention, the process of the battery cell generating a corresponding first detection result based on the detection result of the first insulation detection and sending the first detection result to the PCS non-isolated charging and discharging device includes: if the detection result of the first insulation detection is a failure, the battery cell generates a third message as the first detection result, sends the third message to the PCS non-isolated charging and discharging device, and terminates the charging and discharging sequence of the current round; if the detection result of the first insulation detection is a pass, the battery cell generates a fourth message as the first detection result and sends the fourth message to the PCS non-isolated charging and discharging device.

[0049] In one embodiment of the present invention, if the first insulation test fails, the battery cell generates a third message as the first test result and sends a PGN (Programmable Generation Name) of 0x005600, bits 0-10x01, bits 2-30x02, and bits 3-40x02 to the PCS (Power Control System) non-isolated charging and discharging device to terminate the current charging sequence. This technical feature is used to quickly respond to insulation faults when the insulation test at the battery cell end fails, preventing potential damage to the battery system and its control circuit. Simultaneously, the system will record the result of the failed test and related parameters for subsequent analysis and troubleshooting, thereby ensuring the safety and reliability of the system.

[0050] In one embodiment of the present invention, the first insulation detection refers to the insulation detection at the power battery terminal. The process includes: performing a pre-charging operation at the battery terminal to eliminate static electricity and residual charge, so as to obtain accurate results when starting the high-voltage test; connecting the battery via a test probe and applying a test voltage using a high-voltage insulation tester to collect test data; and performing real-time analysis of the collected test data to determine whether the result is qualified or not according to a set standard. The test data types for battery terminal insulation detection include: timestamp, test voltage, test current, insulation resistance, test status, battery information, and optional environmental parameters, test configuration parameters, and diagnostic codes.

[0051] In one embodiment of the present invention, the third message is PGN 0x005600, bits 0-10x01, bits 2-3 0x02, and bits 3-40x02, used to indicate that the first insulation test failed. The fourth message is PGN 0x005600, bits 0-1 0x01, bits 2-3 0x02, and bits 3-40x01, used to indicate that the first insulation test passed.

[0052] Step S13: In response to the successful handshake process, the PCS non-isolated charging and discharging device continues to receive the first detection result. If the first detection result is passed, the second ground detection at the PCS non-isolated charging and discharging device end is activated. After the second ground detection is passed, the circuit closing operation is performed to perform the non-isolated charging and discharging operation. At the same time, the third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation ends.

[0053] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery cell within a preset time, the system further performs the following interaction process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging instruction.

[0054] In one embodiment of the present invention, the PCS non-isolated charge / discharge device determines whether the charge / discharge operation has been completed by monitoring current and voltage parameters in real time. During charging, the system detects whether the battery voltage has reached the set charging threshold and confirms that the charging current has decreased to a safe preset value; during discharging, it monitors whether the discharging current has fallen back to the set stop threshold or whether the battery voltage is lower than the specified safe level. When the operation is completed, the PCS sends a charging completion signal to the battery cell to ensure that the system can perform further operations and work collaboratively according to the current state. The charging completion signal (CHM) refers to the signal or message sent by the PCS non-isolated charge / discharge device after the charging and discharging operations are completed, intended to notify the battery management system (BMS) of the battery cell that the charging or discharging process has been successfully completed.

[0055] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device fails to receive the second message sent back by the battery cell within a preset time, the handshake process fails, and the system further performs the following interaction process: in response to the failure of the handshake process, the battery cell performs an isolated charging and discharging operation; in response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging command.

[0056] In this embodiment, the PCS non-isolated charging and discharging device will simultaneously determine whether it has received a second message and a fourth message within a preset time. The second message indicates that the PCS non-isolated charging and discharging device and the battery cell have established a communication connection through a handshake process, and the fourth message indicates that the battery cell has successfully passed the vehicle-side insulation test.

[0057] In one embodiment of the present invention, the battery cell performing isolated charge-discharge operation refers to a charging and discharging method that separates the battery cell from the power grid or load through electrical isolation technology. In this operation, a dedicated isolation module can effectively prevent reverse current flow and short-circuit risks, ensuring the safety and stability of the battery during charging and discharging. This process includes a series of precise control steps, such as monitoring battery status, intelligently adjusting the charging and discharging process, and responding to grid demands in real time.

[0058] In one embodiment of the invention, the circuit closing operation includes using a DC circuit contactor disposed inside the charging and discharging device to perform the circuit closing operation, wherein switches K1 and K2 are key components. By closing switch K1, the battery management system connects to the charging power supply, applies appropriate voltage and current to the battery cell, thereby gradually increasing the battery voltage to a safe range and activating the internal chemical reaction; while switch K2 is used to close the battery cell circuit, ensuring the electrical connection of the current charging path. The DC contactor is responsible for controlling the closing and opening of K1 and K2, ensuring effective management of current flow during charging and discharging operations. By simultaneously closing K1 and K2, the system can perform stable and safe pre-charging, laying a solid foundation for subsequent charging and discharging operations, ultimately improving battery life and overall system performance.

[0059] In one embodiment of the present invention, the process of performing the third insulation detection of the charging and discharging circuit until the non-isolated charging and discharging operation ends includes: upon receiving a termination of charging process initiated by either the charging / discharging device or the battery cell, the current charging / discharging state is first confirmed, such as the battery's charge, temperature, and voltage, to ensure that all safety conditions are met. Subsequently, the charging / discharging circuit is disconnected to ensure that current surges or short circuits are avoided during the switching process, thereby protecting the battery and other electrical components. After charging and discharging is completed, a feedback signal is sent to confirm that the operation has safely ended and the battery status information is updated. Simultaneously, the system automatically logs the charging and discharging process, including time, charge / discharge amount, and any abnormal situations, to support subsequent data analysis and troubleshooting. Finally, global ground detection is disabled.

[0060] It is worth noting that, in another embodiment of the present invention, after the PCS non-isolated charging and discharging device, the battery cell, and the entire charging and discharging circuit have completed insulation testing, leakage current testing is further performed to ensure the safety and reliability of the system. In this scheme, firstly, the battery cell and the PCS non-isolated charging and discharging device each perform insulation testing before interaction to ensure their own good insulation status. Then, the battery cell disables its insulation testing function, while the PCS non-isolated charging and discharging device subsequently performs insulation testing on the DC circuit. Simultaneously, leakage current testing is performed on each DC circuit to ensure timely response to any abnormalities. To achieve this, a leakage current sensor is installed on the DC circuit, and its detection threshold is set to 30mA. When the leakage current exceeds this threshold, a warning signal is immediately generated, and corresponding protective measures are taken to prevent potential damage. In this way, insulation testing and leakage current testing can be effectively performed even with multiple batteries connected in parallel and the PCS non-isolated charging and discharging device in use, thereby ensuring the safety and reliability of the entire charging and discharging process of the present invention.

[0061] Although leakage current issues may still exist after three insulation tests, this is because insulation testing primarily focuses on the electrical isolation between different parts of the invention, while leakage current can be caused by various factors, including aging of electrical connectors, damage to wiring, and equipment malfunction. Furthermore, considering that leakage current can be very small, higher precision and sensitivity are required for detection, which simple insulation testing may not fully meet. Therefore, after three insulation tests, this invention further performs leakage current testing to ensure its safety and reliability. This dual testing approach allows for a more comprehensive assessment of the electrical safety of the invention and enables timely response to any anomalies detected.

[0062] In embodiments of the present invention, terms such as "first message" and "second message" are used to distinguish identical or similar items with essentially the same function and purpose. For example, "first message" and "second message" are used only to distinguish different messages and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that terms such as "first" and "second" do not necessarily imply that they are different.

[0063] It should be noted that in the embodiments of the present invention, the words "exemplary" or "for example" indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0064] In this embodiment of the invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0065] It should also be understood that the module division in the embodiments of the present invention is illustrative and only represents one logical functional division; in actual implementation, there may be other division methods. Furthermore, the functional modules in the various embodiments of the present invention can be integrated into a single processor, exist as separate physical entities, or two or more modules can be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0066] Figure 3 This is a flowchart illustrating an embodiment of the multi-cell non-isolated insulation detection method based on PCS according to the present invention, wherein the method is applied to a PCS non-isolated charge-discharge device. Figure 3 As shown, the PCS-based multi-cell non-isolated insulation detection method includes the following steps.

[0067] Step S1: In response to the failure of the handshake process, the battery cell performs an isolated charge and discharge operation.

[0068] In one embodiment of the present invention, the process of initiating a handshake between the battery cell and the PCS non-isolated charging and discharging device includes: the PCS non-isolated charging and discharging device sending a first message to the battery cell at a preset period, while the battery cell continuously receives the first message; after receiving the first message, the battery cell sending a second message to the PCS non-isolated charging and discharging device at a preset period, while the PCS non-isolated charging and discharging device continuously receives the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery cell within a preset time, the handshake process is successful.

[0069] In one embodiment of the present invention, the process of the battery cell generating a corresponding first detection result based on the detection result of the first insulation detection and sending the first detection result to the PCS non-isolated charging and discharging device includes: if the detection result of the first insulation detection is a failure, the battery cell generates a third message as the first detection result, sends the third message to the PCS non-isolated charging and discharging device, and terminates the charging and discharging sequence of the current round; if the detection result of the first insulation detection is a pass, the battery cell generates a fourth message as the first detection result and sends the fourth message to the PCS non-isolated charging and discharging device.

[0070] Step S2: In response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging command.

[0071] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery cell within a preset time, the system further performs the following interaction process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging instruction.

[0072] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device fails to receive the second message sent back by the battery cell within a preset time, the handshake process fails, and the system further performs the following interaction process: in response to the failure of the handshake process, the battery cell performs an isolated charging and discharging operation; in response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging command.

[0073] Figure 4 This is a flowchart illustrating an embodiment of the multi-cell non-isolated insulation detection method based on PCS of the present invention, the method being applied to a battery cell. Figure 4 As shown, the PCS-based multi-cell non-isolated insulation detection method includes the following steps.

[0074] Step S1: After receiving the charging command, send a wake-up message to the battery cell to start the charging and discharging sequence of the current cycle; then initiate a handshake process with the battery cell.

[0075] In one embodiment of the present invention, the process of initiating a handshake between the battery cell and the PCS non-isolated charging and discharging device includes: the PCS non-isolated charging and discharging device sending a first message to the battery cell at a preset period, while the battery cell continuously receives the first message; after receiving the first message, the battery cell sending a second message to the PCS non-isolated charging and discharging device at a preset period, while the PCS non-isolated charging and discharging device continuously receives the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery cell within a preset time, the handshake process is successful.

[0076] In one embodiment of the present invention, the process of the battery cell generating a corresponding first detection result based on the detection result of the first insulation detection and sending the first detection result to the PCS non-isolated charging and discharging device includes: if the detection result of the first insulation detection is a failure, the battery cell generates a third message as the first detection result, sends the third message to the PCS non-isolated charging and discharging device, and terminates the charging and discharging sequence of the current round; if the detection result of the first insulation detection is a pass, the battery cell generates a fourth message as the first detection result and sends the fourth message to the PCS non-isolated charging and discharging device.

[0077] Step S2: In response to the successful handshake process, continue to receive the first detection result. If the first detection result is passed, then start the second grounding detection at the PCS non-isolated charging and discharging device end. After the second grounding detection is passed, perform the circuit closing operation to perform the non-isolated charging and discharging operation. At the same time, perform the third insulation detection of the charging and discharging circuit until the non-isolated charging and discharging operation ends.

[0078] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery cell within a preset time, the system further performs the following interaction process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging instruction.

[0079] In one embodiment of the present invention, if the PCS non-isolated charging and discharging device fails to receive the second message sent back by the battery cell within a preset time, the handshake process fails, and the system further performs the following interaction process: in response to the failure of the handshake process, the battery cell performs an isolated charging and discharging operation; in response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell; otherwise, it terminates the current round of charging and discharging sequence and continues to wait for the charging command.

[0080] It should be understood that the specific process of each module performing the above-mentioned corresponding steps has been described in detail in the above system embodiments, and will not be repeated here for the sake of brevity.

[0081] Figure 5 This is a schematic block diagram of an electronic terminal provided in an embodiment of the present invention. Figure 5As shown, the electronic terminal includes at least one processor 501, a memory 502, at least one network interface 503, and a user interface 505. The various components in the device are coupled together via a bus system 504. It is understood that the bus system 504 is used to implement communication between these components. In addition to a data bus, the bus system 504 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 5 The general will label all buses as bus systems.

[0082] The user interface 505 may include a monitor, keyboard, mouse, trackball, clicker, button, touchpad, or touch screen.

[0083] It is understood that memory 502 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM) or programmable read-only memory (PROM), used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM) and synchronous static random access memory (SSRAM). The memories described in the embodiments of this invention are intended to include, but are not limited to, these and any other suitable categories of memory.

[0084] In this embodiment of the invention, the memory 502 is used to store various types of data to support the operation of the electronic terminal 500. Examples of this data include: any executable program for operation on the electronic terminal 500, such as the operating system 5021 and application program 5022; the operating system 5021 contains various system programs, such as the framework layer, core library layer, driver layer, etc., for implementing various basic services and handling hardware-based tasks. The application program 5022 may contain various applications, such as a media player, browser, etc., for implementing various application services. The implementation of the PCS-based multi-cell non-isolated insulation detection method provided in this embodiment of the invention can be included in the application program 5022.

[0085] The methods disclosed in the above embodiments of the present invention can be applied to processor 501, or implemented by processor 501. Processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 501 or by instructions in the form of software. The processor 501 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 501 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. General-purpose processor 501 may be a microprocessor or any conventional processor, etc. The steps of the accessory optimization method provided in the embodiments of the present invention can be directly reflected as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, which is located in memory. The processor reads the information in the memory and combines it with its hardware to complete the steps of the aforementioned method.

[0086] In an exemplary embodiment, the electronic terminal 500 may be used by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), or complex programmable logic devices (CPLDs) to execute the aforementioned method.

[0087] According to the method provided in the embodiments of the present invention, the present invention also provides a computer program product, the computer program product comprising: computer program code, which, when the computer program code is run on a computer, causes the computer to execute the PCS-based multi-cell non-isolated insulation detection method as described in any of the embodiments above.

[0088] According to the method provided in the embodiments of the present invention, the present invention also provides a computer-readable storage medium storing program code, which, when run on a computer, causes the computer to perform the PCS-based multi-cell non-isolated insulation detection method as described in any of the embodiments above.

[0089] As used in this specification, the terms "component," "module," "system," etc., are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. As illustrated, applications running on computing devices and computing devices can both be components. One or more components may reside in a process and / or an execution thread, and components may be located on a single computer and / or distributed among two or more computers. Furthermore, these components can be executed from various computer-readable media on which various data structures are stored. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0090] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0091] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0092] In the embodiments provided by this invention, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0093] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0094] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0095] In the above embodiments, the functions of each functional unit can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. A computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, all or part of the flow or function according to the embodiments of the present invention is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

[0096] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0097] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0098] In summary, this invention provides a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product, and terminal. It offers a ground-based detection method to improve the peak efficiency and safety of charging systems. This method uses PCS to form charging piles to charge and discharge batteries in battery swapping stations. Before interaction, each battery and charging pile performs insulation detection, then the battery insulation detection is disabled. Subsequently, the PCS charging pile performs global DC loop insulation detection, while simultaneously detecting leakage current in each DC loop. This technical solution achieves beneficial effects such as improved charging and discharging system efficiency, compatibility with traditional transformers, and resolution of multi-battery parallel connection issues. It solves the technical problems of low efficiency and difficulty in parallel connection of multiple batteries in existing battery swapping stations. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A multi-cell non-isolated insulation detection system based on PCS, characterized in that, The system includes multiple pairs of PCS non-isolated charging and discharging devices and battery cells. The interaction process between each pair of PCS non-isolated charging and discharging devices and the battery cell includes: After receiving a charging command, the PCS non-isolated charging and discharging device sends a wake-up message to the battery cell to start the charging and discharging sequence of the current cycle. The battery cell continuously receives the wake-up message and, upon receiving the wake-up message, activates the first insulation detection at the battery cell end. Subsequently, the battery cell and the PCS non-isolated charging and discharging device initiate a handshake process. In response to the successful handshake process, the battery cell generates a corresponding first detection result based on the detection result of the first insulation detection, sends the first detection result to the PCS non-isolated charging and discharging device, and disables the first insulation detection; wherein, the process of the battery cell generating a corresponding first detection result based on the detection result of the first insulation detection and sending the first detection result to the PCS non-isolated charging and discharging device includes: if the detection result of the first insulation detection is a failure, the battery cell generates a third message as the first detection result, sends the third message to the PCS non-isolated charging and discharging device, and terminates the charging and discharging sequence of the current round; if the detection result of the first insulation detection is a success, the battery cell generates a fourth message as the first detection result, sends the fourth message to the PCS non-isolated charging and discharging device; In response to the successful handshake process, the PCS non-isolated charging and discharging device continues to receive the first detection result. If the first detection result is passed, the second grounding detection at the PCS non-isolated charging and discharging device end is activated. After the second grounding detection is passed, a circuit closing operation is performed to perform non-isolated charging and discharging operation. At the same time, the third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation ends.

2. The PCS-based multi-cell non-isolation insulation detection system according to claim 1, characterized in that, The process of initiating a handshake between the battery cell and the PCS non-isolated charging and discharging device includes: The PCS non-isolated charging and discharging device sends a first message to the battery cell at a preset period, while the battery cell continuously receives the first message; after receiving the first message, the battery cell sends a second message to the PCS non-isolated charging and discharging device at a preset period, while the PCS non-isolated charging and discharging device continuously receives the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery cell within a preset time, the handshake process is successful.

3. The PCS-based multi-cell non-isolation insulation detection system according to claim 1, characterized in that, If the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery cell within a preset time, the system will also perform the following interaction process: The PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell. Otherwise, the current charging / discharging sequence is terminated, and the system continues to wait for the charging command.

4. The PCS-based multi-cell non-isolation insulation detection system according to claim 2, characterized in that, If the PCS non-isolated charging and discharging device fails to receive the second message sent back by the battery cell within a preset time, the handshake process fails, and the system also performs the following interaction process: In response to the failure of the handshake process, the battery cell performs an isolated charge and discharge operation; In response to the failure of the handshake process, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation has been completed. If it has been completed, it sends a charging completion signal to the battery cell. Otherwise, the current charging / discharging sequence is terminated, and the system continues to wait for the charging command.

5. A multi-cell non-isolation insulation detection method based on PCS, characterized in that, The method is applied to the PCS non-isolated charging and discharging device of the PCS-based multi-cell non-isolated insulation detection system as described in claim 1, and the method includes: Upon receiving a charging command, a wake-up message is sent to the battery cell to initiate the current charging and discharging sequence; subsequently, a handshake process is initiated with the battery cell. In response to the successful handshake process, the system continuously receives the first detection result. If the first detection result is passed, the second grounding detection at the PCS non-isolated charging and discharging device end is activated. After the second grounding detection is passed, the circuit closing operation is performed to perform the non-isolated charging and discharging operation. At the same time, the third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation ends.

6. A multi-cell non-isolation insulation detection method based on PCS, characterized in that, The method is applied to the battery cell of the PCS-based multi-cell non-isolated insulation detection system as described in claim 1, and the method includes: Continuously receive wake-up messages, and upon receiving the wake-up message, initiate the first insulation detection at the battery cell end; initiate a handshake process with the PCS non-isolated charging and discharging device; In response to the successful handshake process, a corresponding first detection result is generated based on the detection result of the first insulation detection, the first detection result is sent to the PCS non-isolated charging and discharging device, and the first insulation detection is turned off.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the PCS-based multi-cell non-isolated insulation detection method according to any one of claims 5 or 6.

8. A computer program product, characterized in that, The computer program product includes computer program code, which, when run on a computer, causes the computer to implement the PCS-based multi-cell non-isolated insulation detection method as described in any one of claims 5 or 6.

9. An electronic terminal, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the PCS-based multi-cell non-isolated insulation detection method according to any one of claims 5 or 6.

Images