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

Abstract

The invention provides a PCS-based multi-battery non-isolated insulation detection system, a PCS-based multi-battery non-isolated insulation detection method, a medium, a program product and a terminal, the PCS is used for forming a charging pile to charge and discharge a battery of a battery swap station, the battery and the charging pile are respectively subjected to insulation detection before interaction, then the battery insulation detection is closed, and then the PCS charging pile executes global direct current loop insulation detection, so that the insulation detection efficiency is improved. According to the technical scheme, the efficiency of a charging and discharging system is improved, a traditional transformer is adapted, the problem of parallel connection of multiple batteries is solved, and the technical problems that an existing battery replacing station is low in efficiency, and parallel connection of the multiple batteries is difficult are solved.

Description

Technical Field

[0001] The present invention relates to the field of insulation detection, and in particular to a PCS-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal. Background Art

[0002] In the field of multi-battery energy storage and power management, with the rapid development of electric vehicles and renewable energy, the energy exchange and control technology between batteries and power grids has attracted increasing attention. However, there are some significant defects in the existing technology, which restricts the efficient application of multi-battery systems.

[0003] Most current systems use unidirectional AC / DC isolation modules for battery charging. Although the peak efficiency can reach 95%, this unidirectional module severely limits the flexibility of the system, especially in terms of switching capabilities between grid-connected and off-grid. At the same time, the unidirectional AC / DC modules commonly used in battery swap stations are not only inefficient, but also unable to interact with the reverse grid. This mode affects the overall efficiency and functionality of the system. In addition, standard transformers cannot meet the dynamic power supply requirements of multi-battery systems. Therefore, specially designed multi-winding special transformers must be used, which increases the overall transformer cost by about 50%. Although bidirectional AC / DC isolation modules can also achieve 95% efficiency, their high price limits their widespread application in the market, further exacerbating the contradiction between cost and efficiency. In addition, when multi-battery systems are connected in parallel and combined with PCS charging piles, the mutual interference of the battery insulation detection balance bridge causes a false decrease in insulation detection resistance, which increases complexity and affects the reliability of the system. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the object of the present invention is to provide a multi-battery non-isolated insulation detection system, method, medium, program product and terminal based on PCS, which are used to solve the problems existing in the prior art that the unidirectional AC / DC isolation module is not flexible enough, the standard transformer cannot be connected in parallel to the grid or powered off the grid through PCS, and the bidirectional AC / DC module is high cost and the multi-battery system requires a special multi-winding transformer.

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present invention provides a method for a multi-battery non-isolated insulation detection system based on PCS, the system comprising a plurality of groups of PCS non-isolated charging and discharging devices and battery cells arranged in pairs, and the interaction process between each group of PCS non-isolated charging and discharging devices and battery cells comprises: after receiving a charging instruction, the PCS non-isolated charging and discharging device sends a wake-up message to the battery cell to start the current round of charging and discharging sequence; the battery cell continuously receives the wake-up message, and after receiving the wake-up message, starts the first insulation detection at the battery cell end, and then the battery cell and the PCS non-isolated charging and discharging device start Handshake process; in response to the success of the handshake process, the battery unit 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; in response to the success of the handshake process, the PCS non-isolated charging and discharging device continues to receive the first detection result, if the first detection result is passed, then the second geographical detection at the PCS non-isolated charging and discharging device end is turned on, and after the second geographical detection is passed, a circuit closing operation is performed to perform a non-isolated charging and discharging operation, and a third insulation detection of the charging and discharging circuit is performed at the same time until the non-isolated charging and discharging operation is completed.

[0006] In some embodiments of the first aspect of the present invention, the process of starting a handshake process 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, and the battery cell continues to receive 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, and the PCS non-isolated charging and discharging device continues to receive 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.

[0007] In some embodiments of the first aspect of the present invention, the battery cell generates a corresponding first detection result based on the detection result of the first insulation detection, and the process of 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 failed, 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 current round of charging and discharging timing; if the detection result of the first insulation detection is passed, 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 unit within a preset time, the system also performs the following interactive process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation is completed, and if completed, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, 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 unit within a preset time, the handshake process fails, and the system also performs the following interactive process: in response to the failure of the handshake process, the battery unit 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 is completed, and if so, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, and continues to wait for the charging instruction.

[0010] To achieve the above-mentioned purpose and other related purposes, the second aspect of the present invention provides a multi-battery non-isolated insulation detection method based on PCS, which is applied to PCS non-isolated charging and discharging equipment, and the method includes: after receiving a charging instruction, sending a wake-up message to the battery unit to start the current round of charging and discharging timing; then starting a handshake process with the battery unit; in response to the success of the handshake process, continuously receiving the first detection result, if the first detection result is passed, then starting the second geo-detection at the PCS non-isolated charging and discharging equipment end, and performing a circuit closure operation after the second geo-detection passes to perform a non-isolated charging and discharging operation, and at the same time performing a third insulation detection of the charging and discharging circuit until the non-isolated charging and discharging operation is completed.

[0011] To achieve the above-mentioned purpose and other related purposes, the third aspect of the present invention provides a multi-battery non-isolated insulation detection method based on PCS, which is applied to a battery cell, and the method includes: continuously receiving a wake-up message, and after receiving the wake-up message, starting a first insulation detection at the battery cell end; starting a handshake process with the PCS non-isolated charging and discharging device; in response to the success of the 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 turning off the first insulation detection.

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

[0013] To achieve the above-mentioned purpose and other related purposes, the fifth aspect of the present invention provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer implements the method.

[0014] To achieve the above-mentioned purpose and other related purposes, the 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-battery non-isolated insulation detection system, method, medium, program product and terminal of the present invention have the following beneficial effects: significantly improving the overall efficiency of the charging and discharging system, breaking through the limitation of the low efficiency of the traditional isolation module, and increasing the peak efficiency of the system from 95% to 98%, ensuring more efficient and reliable charging and discharging operations. At the same time, it effectively solves the technical difficulties when multiple batteries are connected in parallel, and realizes the safe and reliable parallel operation of multiple batteries. In addition, this solution is compatible with traditional transformers and does not require the use of special transformers with multiple windings, which reduces the transformer cost by about 50%, significantly reducing the overall investment cost of the system. Therefore, the present invention not only improves the energy efficiency of the system, but also greatly reduces the operating costs, providing an economical and efficient solution for a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart showing the interaction process of an embodiment of a PCS-based multi-battery non-isolated insulation detection system of the present invention.

[0017] Figure 2 A flow chart showing the interaction process of another embodiment of the PCS-based multi-battery non-isolated insulation detection system of the present invention.

[0018] Figure 3 A flow chart of an embodiment of a PCS non-isolated charging and discharging device method for non-isolated insulation detection of multiple batteries based on PCS of the present invention is shown.

[0019] Figure 4 A flow chart of an embodiment of a battery cell method for non-isolated insulation detection of multiple batteries based on PCS of the present invention is shown.

[0020] Figure 5 A structural schematic diagram of an embodiment of a multi-battery non-isolated insulation detection terminal based on PCS of the present invention is shown. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] Before further describing the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are applicable to the following interpretations:

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

[0024] <2> Non-isolation: refers to a mode in which electrical isolation is achieved without using isolation components such as transformers or optocouplers in circuit design. This design usually has the advantages of simple structure and high efficiency, but has stricter requirements on system grounding and safety protection, which may increase the risk of failure.

[0025] <3> Insulation testing: A technology used to monitor the insulation condition within the power system to ensure the effectiveness of the insulation between the high voltage part and the low voltage part or the ground. Its purpose is to avoid safety accidents caused by insulation failure. Insulation testing usually uses methods such as resistance measurement and balanced bridge to ensure the safe operation of equipment.

[0026] <4> A+A- signal: A control signal used to wake up a power system or device, usually indicating the positive and negative polarity of a DC signal. This signal transmits instructions during system startup and control to ensure that the device is in the correct working state.

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

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

[0029] <7> J1939 protocol: A CAN bus-based communication protocol designed for commercial vehicles and off-road machinery. The J1939 protocol standardizes data transmission format, message priority and network management, and promotes efficient interconnection and communication between different electronic control units.

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

[0031] <9> K1K2 switch: refers to the switch between the charging and discharging equipment and the battery cell, usually composed of two relays or contactors. The K1K2 switch is responsible for controlling the flow of current to ensure the safety and efficient energy management of the battery during the charging and discharging process.

[0032] The PCS-based multi-battery non-isolated insulation detection system, method, medium, program product and terminal of the present invention are applied in the following scenarios: operation maintenance and safety monitoring of large-scale energy storage systems, electric vehicle battery packs, and other high-voltage battery packs. The present invention can quickly and accurately detect the insulation status of multiple battery cells without isolation, thereby effectively improving the detection efficiency, reducing maintenance costs, and improving the safety and reliability of the battery system.

[0033] It should be noted that the battery insulation detection in the prior art mainly adopts two methods: one is to set up an isolation module at the battery end for detection. Although this method can achieve isolation, it increases the system cost and complexity, and each battery cell requires a separate isolation module, which significantly increases the cost; the second is to use a customized multi-winding transformer to achieve isolation control at the transformer end, but this also faces high customization costs, and the complex transformer structure increases the volume and weight of the system, while increasing the difficulty of detection judgment and the process is cumbersome. Both methods have the problems of high cost, complex detection process and cumbersome judgment, which limits their wide application in large battery packs.

[0034] The present invention does not require an additional isolation module or a customized transformer. Before the national standard charging and discharging communication protocol is interacted, the charging and discharging equipment and the battery unit are coordinated to perform self-diagnostic insulation detection. After the detection result is confirmed to be correct, the battery unit is controlled to shut down its own detection through communication instructions, and the insulation detection on the charging and discharging equipment side is enabled at the same time, so as to monitor the leakage current of the entire DC circuit in real time and realize effective monitoring of the insulation status of the battery pack, thereby replacing the traditional battery insulation detection scheme based on isolation modules or special transformers. The present invention is based on PCS charging and discharging equipment and improves the peak efficiency of the existing AC / DC conversion system from 95% to 98%.

[0035] To facilitate understanding of the embodiments of the present invention, first Figure 1 Detailed description. Figure 1 A schematic diagram of a process flow of a PCS-based multi-battery non-isolated insulation detection system in an embodiment of the present invention is shown. Figure 2 The flowchart of the PCS-based multi-battery non-isolated insulation detection system in another embodiment of the present invention is shown. In this embodiment, the PCS-based multi-battery non-isolated insulation detection system includes multiple groups of paired PCS non-isolated charging and discharging devices and battery cells, and the interaction process between each group of PCS non-isolated charging and discharging devices and battery cells mainly includes the following steps:

[0036] Step S11: After receiving the charging instruction, the PCS non-isolated charging and discharging device sends a wake-up message to the battery cell to start the current round of charging and discharging timing; the battery cell continues to receive the wake-up message, and after receiving the wake-up message, starts 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 equipment adopts the charging and discharging equipment of the power electronic conversion technology (PCS), directly converts the alternating current and direct current, and eliminates the traditional AC / DC isolation transformer. This makes the system structure simpler, lower in cost, smaller in size and more efficient. However, due to the lack of an isolation transformer, the safety is low, so the insulation detection scheme of the present invention can greatly improve the safety of the PCS non-isolated charging and discharging equipment.

[0038] In one embodiment of the present invention, the battery unit includes a power unit, and the power battery is a high energy density battery used in electric vehicles, hybrid vehicles, power tools, and energy storage systems, and has the characteristics of high discharge current. The power battery is usually composed of a plurality of battery cells to form a battery pack, and is equipped with a battery management system (BMS) to monitor the battery status and manage charging and discharging. The power battery can be a lithium-ion battery (such as lithium iron phosphate and ternary lithium battery), a lead-acid battery and a nickel-hydrogen battery, a solid-state battery, and a sodium-ion battery.

[0039] In one embodiment of the present invention, after receiving the charging instruction, the PCS non-isolated charging and discharging device sends a wake-up message to the battery unit to start the current round of charging and discharging timing. 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 signal can be any predefined signal type (for example, a specific voltage level or pulse) and is sent twice to enhance reliability. The negative pulse signal "-" marks the end of the wake-up signal, avoids conflicts with other signals, and ensures the smooth reception of subsequent data.

[0040] In one embodiment of the present invention, the charge and discharge sequence refers to the complete time sequence for the PCS device and the battery cell to coordinate to complete the charging or discharging process, including: the charging sequence is the time sequence for the PCS charging and discharging device and the battery cell to 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 starting a handshake process between the battery unit 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 unit at a preset period, and the battery unit continues to receive the first message; after the battery unit receives the first message, it sends a second message to the PCS non-isolated charging and discharging device at a preset period, and the PCS non-isolated charging and discharging device continues to receive the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery unit 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 for starting vehicle-side geo-location detection to the battery unit shown in a period of 250ms, and determines whether a second message sent back by the battery unit is received 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 adopts the unique parameter group number PGN (Parameter Group Number) used to identify the message type and content in the J1939 protocol. The first message, the second message, the third message and the fourth message 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 part), Sender (sender id, identifying the source of the message), Cycle Time (message cycle, indicating the frequency of message transmission), Signal Name (signal name, describing the meaning of each signal in the message), StarBit (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 receiving target of the message), VALTable (value table, defining the meaning of the signal value). These fields together describe the structure, content, sending and receiving information of the message and the specific meaning of the signal. Exemplarily, the first message is PGN0x005500, data00x02. The second message is PGN 0x005600, bit0~10x02, bit2~30x01, bit3~40x03. The third message is PGN 0x005600, bit0~10x01, bit2~3 0x02, bit3~40x02. The fourth message is PGN 0x005600, bit0~1 0x01, bit2~3 0x02, bit3~4 0x01.

[0044] Further, Table 1 shows the message structure in the embodiment of the present invention. It uses the unique parameter group number (PGN) in the J1939 protocol for identifying the message type and content. The data frame of message 1 with ID 0x1855F456 is sent by the discharge machine, the data length code (DLC) is 8 bytes, and the sending cycle is 100 milliseconds. The signal "request BMS to turn off insulation detection" has a start bit of 0 in the message, a length of 2 bits, and the receiver is the BMU. The value table (VALTable) of the signal is defined as: 0 for reserved, 1 for no request, 2 for requesting BMS to turn off insulation, and 3 for invalid. The data frame of message 2 with ID 0x185656F4 is sent by the BMU, the data length code is 8 bytes, and the sending cycle is 100 milliseconds. The signal "BMS current insulation status" has a start bit of 0 in the message, a length of 2 bits, and the receiver is the discharge machine. Its value table (VALTable) is defined as: 0 for reserved, 1 for insulation off, 2 for insulation on, and 3 for invalid. In the data frame of message 3 with ID 0x185656F4, the signal "BMS insulation detection completion flag" has a starting bit of 2 in the message and a length of 2 bits. The receiver is the discharge machine, and the value table (VALTable) of the signal is: 0 for reserved, 1 for uncompleted, 2 for completed, and 3 for invalid. In the data frame of message 4 with ID 0x185656F4, the signal "BMS current insulation detection fault flag" has a starting bit of 4 in the message and a length of 2 bits. The receiver is the discharge machine, and its value table (VALTable) is defined as: 0 for reserved, 1 for normal, 2 for fault, and 3 for invalid.

[0045] Message ID DLC Sender Message cycle Signal name LSE length Receiver 0x1855F456 8 Discharge motor 100 Request BMS to turn off insulation detection 0 2 BMU 0x185656F4 8 BMU 100 BMS current insulation status 0 2 Discharge motor 0x185656F4 8 BMU 100 BMS insulation detection completed flag 2 2 Discharge motor 0x185656F4 8 BMU 100 BMS current insulation detection fault flag 4 2 Discharge motor

[0046] Table 1: Message structure in the embodiment of the present invention

[0047] Step S12: In response to the success of the handshake process, the battery unit 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 battery unit generates a corresponding first detection result based on the detection result of the first insulation detection, and the process of 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 failed, the battery unit 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 current round of charging and discharging timing; if the detection result of the first insulation detection is passed, the battery unit 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 test result of the first insulation test is failure, the battery unit generates a third message as the first test result, and sends a PGN of 0x005600, bit0~10x01, bit2~30x02, bit3~40x02 to the PCS non-isolated charging and discharging device to end the current round of charging sequence. This technical feature is used to quickly respond to insulation faults when the insulation test at the electrical unit end fails to prevent potential damage to the battery system and its control circuit. At the same time, the system will also record the results and related parameters of the failed test to facilitate 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 of the power battery terminal, and 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 to the battery through a test probe, and applying a test voltage using a high-voltage insulation tester to collect test data, and performing real-time analysis on the collected test data to determine whether the result is qualified according to the set standard. The test data types of the 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, bit0-1 0x01, bit2-3 0x02, bit3-4 0x02, to indicate that the first insulation test has not passed. The fourth message is PGN 0x005600, bit0-1 0x01, bit2-3 0x02, bit3-4 0x01, to indicate that the first insulation test has passed.

[0052] Step S13: In response to the success of the 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 geo-detection on the PCS non-isolated charging and discharging device end is turned on. After the second geo-detection is passed, a circuit closing operation is performed to perform a non-isolated charging and discharging operation. At the same time, a third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation is completed.

[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 unit within a preset time, the system also performs the following interactive process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation is completed, and if completed, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, and continues to wait for the charging instruction.

[0054] In one embodiment of the present invention, the PCS non-isolated charging and discharging device determines whether the charging and discharging operation has been completed by real-time monitoring of current and voltage parameters. During the charging process, the system detects whether the battery voltage reaches the set charging threshold and confirms that the charging current is reduced to a safe preset value; in the case of discharge, it monitors whether the discharge current falls back to the set stop threshold or whether the battery voltage is lower than the specified safety 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 together according to the current status. Among them, the charging completion signal CHM (Charging Completion Message) refers to the signal or message sent by the PCS non-isolated charging and discharging device after the charging and discharging operations are completed, which is 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 unit within a preset time, the handshake process fails, and the system also performs the following interactive process: in response to the failure of the handshake process, the battery unit 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 is completed, and if so, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, and continues to wait for the charging instruction.

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

[0057] In one embodiment of the present invention, the battery cell performs isolated charging and discharging operations, which 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 the reverse flow of current and the risk of short circuit, ensuring the safety and stability of the battery during the charging and discharging process. The process includes a series of precise control steps, such as monitoring the battery status, intelligently adjusting the charging and discharging process, and responding to the power grid demand in real time.

[0058] In one embodiment of the present 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 the K1 and K2 switches are key components. By closing the K1 switch, the battery management system connects to the charging power supply and applies a moderate voltage and current to the battery cell, thereby gradually increasing the battery voltage to a safe range and activating the internal chemical reaction; and the K2 switch is used to achieve the closure of the battery cell circuit to ensure the electrical connection of the current charging path. The DC contactor is responsible for controlling the closing and opening of K1 and K2 to ensure effective management of current flow during charging and discharging operations. By closing K1 and K2 at the same time, the system can perform pre-charging stably and safely, laying a solid foundation for subsequent charging and discharging operations, and ultimately improving the 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 is terminated includes: after receiving the end of the charging process initiated by either the charging and discharging device or the battery cell, the current charging and discharging status, such as the battery power, temperature and voltage, will be confirmed first to ensure that all safety conditions are met. Subsequently, the charging and discharging circuit is disconnected to ensure that current shocks or short circuits are avoided during the switching process, thereby protecting the safety of the battery and other electrical components. After the charging and discharging is completed, a feedback signal will be sent to confirm that the operation has been safely completed and the battery status information will be updated. At the same time, the system will automatically record the log of the charging and discharging process, including time, charging and discharging amount, and abnormal conditions, to support subsequent data analysis and troubleshooting. Finally, the global geo-detection will be turned off.

[0060] It is worth noting that in another embodiment of the present invention, after the PCS non-isolated charging and discharging equipment, the battery unit and the charging and discharging full circuit have respectively performed insulation detection, leakage current detection is further performed to ensure the safety and reliability of the system. In this scheme, first, the battery unit and the PCS non-isolated charging and discharging equipment each perform insulation detection before interaction to ensure that their own insulation state is good. Afterwards, the battery unit turns off its insulation detection function, and the PCS non-isolated charging and discharging equipment then performs the insulation detection task of the DC circuit. At the same time, leakage current detection is performed on each DC circuit so that a timely response can be made when any abnormal situation is found. To achieve this purpose, a leakage current sensor is added to the DC circuit, and its detection threshold is set to 30mA. When the leakage current exceeds the threshold, a warning signal is immediately generated, and corresponding protective measures are taken to prevent possible damage. In this way, insulation detection and leakage current detection can be effectively performed in the case of multiple batteries in parallel and PCS non-isolated charging and discharging equipment, thereby ensuring the safety and reliability of the entire charging and discharging invention.

[0061] Although the present invention may still have leakage current problems after performing three insulation tests, this is because the insulation test mainly focuses on the electrical isolation between the various parts of the present invention, and the leakage current may be caused by a variety of reasons, including aging of electrical connectors, damage to lines, equipment failure, etc. In addition, considering that the leakage current may be very small, it may require higher accuracy and sensitivity to detect, and a simple insulation test may not be able to fully meet this requirement. Therefore, after performing three insulation tests, the present invention further performs leakage current detection to ensure the safety and reliability of the present invention. Through such a dual detection scheme, the electrical safety of the present invention can be more comprehensively evaluated, and a timely response can be made when any abnormal situation is found.

[0062] In the embodiments of the present invention, words such as "first message" and "second message" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first message and the second message are only used to distinguish different messages, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

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

[0064] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c may represent: a, b, c, ab, ac, bc or abc, where a, b, c may be single or plural.

[0065] It should also be understood that the division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0066] Figure 3 1 is a flow chart showing an embodiment of a PCS-based multi-battery non-isolated insulation detection method of the present invention, and the method is applied to PCS non-isolated charging and discharging equipment. Figure 3 As shown, the PCS-based multi-battery non-isolated insulation detection method includes the following process steps.

[0067] Step S1: In response to the handshake process failing, the battery cell performs isolated charge and discharge operations.

[0068] In one embodiment of the present invention, the process of starting a handshake process between the battery unit 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 unit at a preset period, and the battery unit continues to receive the first message; after the battery unit receives the first message, it sends a second message to the PCS non-isolated charging and discharging device at a preset period, and the PCS non-isolated charging and discharging device continues to receive the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery unit within a preset time, the handshake process is successful.

[0069] In one embodiment of the present invention, the battery unit generates a corresponding first detection result based on the detection result of the first insulation detection, and the process of 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 failed, the battery unit 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 current round of charging and discharging timing; if the detection result of the first insulation detection is passed, the battery unit 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 is completed. If completed, a charging completion signal is sent to the battery unit; otherwise, the current round of charging and discharging sequence is terminated and the charging instruction is continuously waited for.

[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 unit within a preset time, the system also performs the following interactive process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation is completed, and if completed, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, 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 unit within a preset time, the handshake process fails, and the system also performs the following interactive process: in response to the failure of the handshake process, the battery unit 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 is completed, and if so, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, and continues to wait for the charging instruction.

[0073] Figure 4 1 is a flow chart showing an embodiment of a multi-battery non-isolated insulation detection method based on PCS of the present invention, wherein the method is applied to a battery cell. Figure 4 As shown, the PCS-based multi-battery non-isolated insulation detection method includes the following process steps.

[0074] Step S1: after receiving the charging instruction, a wake-up message is sent to the battery unit to start the current round of charging and discharging sequence; then a handshake process is started with the battery unit.

[0075] In one embodiment of the present invention, the process of starting a handshake process between the battery unit 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 unit at a preset period, and the battery unit continues to receive the first message; after the battery unit receives the first message, it sends a second message to the PCS non-isolated charging and discharging device at a preset period, and the PCS non-isolated charging and discharging device continues to receive the second message; when the PCS non-isolated charging and discharging device receives the second message sent back by the battery unit within a preset time, the handshake process is successful.

[0076] In one embodiment of the present invention, the battery unit generates a corresponding first detection result based on the detection result of the first insulation detection, and the process of 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 failed, the battery unit 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 current round of charging and discharging timing; if the detection result of the first insulation detection is passed, the battery unit 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 success of the handshake process, continue to receive the first detection result. If the first detection result is passed, start the second geo-detection on the PCS non-isolated charging and discharging device end. After the second geo-detection is passed, perform a circuit closing operation to perform a non-isolated charging and discharging operation. At the same time, perform a third insulation test on the charging and discharging circuit until the non-isolated charging and discharging operation is completed.

[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 unit within a preset time, the system also performs the following interactive process: the PCS non-isolated charging and discharging device determines whether the non-isolated charging and discharging operation is completed, and if completed, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, 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 unit within a preset time, the handshake process fails, and the system also performs the following interactive process: in response to the failure of the handshake process, the battery unit 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 is completed, and if so, sends a charging completion signal to the battery unit; otherwise, terminates the current round of charging and discharging timing, and continues to wait for the charging instruction.

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

[0081] Figure 5 is a schematic block diagram of an electronic terminal provided by 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 through a bus system 504. It can be understood that the bus system 504 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 504 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, Figure 5 In the specification, various buses are labeled as bus systems.

[0082] The user interface 505 may include a display, a keyboard, a mouse, a trackball, a click gun, keys, buttons, a touch pad or a touch screen.

[0083] It is understood that the memory 502 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), which is 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), synchronous static random access memory (SSRAM). The memory described in the embodiments of the present invention is intended to include but is not limited to these and any other suitable categories of memory.

[0084] The memory 502 in the embodiment of the present invention is used to store various categories of data to support the operation of the electronic terminal 500. Examples of these data include: any executable program for operating on the electronic terminal 500, such as an operating system 5021 and an application 5022; the operating system 5021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 5022 can include various applications, such as a media player (Media Player), a browser (Browser), etc., for implementing various application services. The implementation of the PCS-based multi-battery non-isolated insulation detection method provided in the embodiment of the present invention can be included in the application 5022.

[0085] The method disclosed in the above embodiment of the present invention can be applied to the processor 501, or implemented by the processor 501. The 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 hardware integrated logic circuit in the processor 501 or the instruction in the form of software. The above processor 501 may be a general processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 501 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiment of the present invention. The general processor 501 may be a microprocessor or any conventional processor, etc. In combination with the steps of the accessory optimization method provided in the embodiment of the present invention, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0086] In an exemplary embodiment, the electronic terminal 500 may be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD) to execute the aforementioned method.

[0087] According to the method provided by an embodiment of the present invention, the present invention also provides a computer program product, which includes: computer program code, when the computer program code is run on a computer, the computer executes the PCS-based multi-battery non-isolated insulation detection method of any embodiment shown in the above embodiments.

[0088] According to the method provided by an embodiment of the present invention, the present invention also provides a computer-readable storage medium, which stores a program code. When the program code is run on a computer, the computer executes the PCS-based multi-battery non-isolated insulation detection method of any embodiment shown in the above embodiments.

[0089] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination 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. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process and / or an execution thread, and a component may be located on a computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may, for example, communicate through local and / or remote processes according to 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 through signals).

[0090] Those of ordinary skill in the art will appreciate 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

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

[0092] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

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

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

[0095] In the above embodiments, the functions of each functional unit can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When loading and executing computer program instructions (programs) on a computer, the process or function according to the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. 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 contains one or more available media integrations. Available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., high-density digital video discs (DVDs), or semiconductor media (e.g., solid state disks (SSDs)).

[0096] If the function is implemented in the form of 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 the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0097] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0098] In summary, the present invention provides a multi-battery non-isolated insulation detection system, method, medium, program product and terminal based on PCS. The present invention provides a geographical detection method for improving the peak efficiency and safety of the charging system. The charging piles composed of PCS are used to charge and discharge the battery of the battery swap station, and the battery and the charging pile are each subjected to insulation detection before interaction, and then the battery insulation detection is turned off, and then the PCS charging pile is allowed to perform global DC circuit insulation detection, and the technical solution of leakage current detection for each DC circuit is achieved. The beneficial effects of improving the efficiency of the charging and discharging system, adapting to traditional transformers and solving the problem of multi-battery parallel connection are achieved, and the technical problems of low efficiency of existing battery swap stations and difficulty in parallel connection of multiple batteries are solved. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A multi-battery non-isolated insulation detection system based on PCS, characterized in that: The system includes multiple groups of PCS non-isolated charging and discharging devices and battery cells arranged in pairs, and the interaction process between each group of PCS non-isolated charging and discharging devices and battery cells includes: After receiving the charging instruction, the PCS non-isolated charging and discharging device sends a wake-up message to the battery unit to start the current round of charging and discharging timing; the battery unit continues to receive the wake-up message, and after receiving the wake-up message, starts the first insulation detection at the battery unit end, and then the battery unit and the PCS non-isolated charging and discharging device start the handshake process; In response to the success of the handshake process, the battery unit 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; In response to the success of the 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 geo-detection on the PCS non-isolated charging and discharging device end is started. After the second geo-detection is passed, a circuit closing operation is performed to perform a non-isolated charging and discharging operation. At the same time, a third insulation test of the charging and discharging circuit is performed until the non-isolated charging and discharging operation is completed.

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

3. The PCS-based multi-battery non-isolated insulation detection system according to claim 2 is characterized in that: The process in which the battery unit generates a corresponding first detection result based on the detection result of the first insulation detection, and sends the first detection result to the PCS non-isolated charging and discharging device includes: If the detection result of the first insulation detection is failure, the battery unit 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 current round of charging and discharging sequence; If the detection result of the first insulation detection is passed, the battery unit generates a fourth message as the first detection result, and sends the fourth message to the PCS non-isolated charging and discharging device.

4. The PCS-based multi-battery non-isolated insulation detection system according to claim 3 is characterized in that: If the PCS non-isolated charging and discharging device does not receive the fourth message sent by the battery unit within the 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 is completed, and if completed, sends a charging completion signal to the battery unit; Otherwise, the current round of charge and discharge sequence is terminated, and the charging instruction is continuously waited for.

5. The PCS-based multi-battery non-isolated 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 unit within the preset time, the handshake process fails, and the system further performs the following interaction process: In response to the handshake process failing, the battery unit performs an isolated charge and discharge operation; In response to the handshake process failing, the PCS non-isolated charging and discharging device determines whether the isolated charging and discharging operation is completed, and if so, sends a charging completion signal to the battery unit; Otherwise, the current round of charge and discharge sequence is terminated, and the charging instruction is continuously waited for.

6. A multi-battery non-isolated insulation detection method based on PCS, characterized in that: The method is applied to PCS non-isolated charging and discharging equipment, and the method comprises: After receiving the charging instruction, a wake-up message is sent to the battery unit to start the current round of charging and discharging sequence; then a handshake process is started with the battery unit; In response to the success of the handshake process, the first detection result is continuously received. If the first detection result is passed, the second geo-detection on the PCS non-isolated charging and discharging device end is started. After the second geo-detection is passed, a circuit closing operation is performed to perform a non-isolated charging and discharging operation. At the same time, a third insulation detection of the charging and discharging circuit is performed until the non-isolated charging and discharging operation is completed.

7. A multi-battery non-isolated insulation detection method based on PCS, characterized in that: The method is applied to a battery cell c, and comprises: Continuously receiving a wake-up message, and after receiving the wake-up message, starting the first insulation detection of the battery cell end; starting a handshake process with the PCS non-isolated charging and discharging device; In response to the handshake process being successful, 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.

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

9. A computer program product, characterized in that The computer program product includes computer program codes, and when the computer program codes are executed on a computer, the computer is enabled to implement the PCS-based multi-battery non-isolated insulation detection method according to any one of claims 6 or 7.

10. 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-battery non-isolated insulation detection method according to any one of claims 6 or 7.

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