Parallel type battery self-healing nuclear containment system

Abstract

The application relates to a parallel type self-healing nuclear battery system, belonging to the technical field of battery management, which comprises a charging circuit and a freewheeling circuit. The input end of the charging circuit is electrically connected with an alternating current power supply, the output end of the charging circuit is electrically connected with a direct current bus, and a charging device is electrically connected on the charging circuit. The two ends of the freewheeling circuit are both electrically connected with the direct current bus through diodes, and a plurality of parallel management modules arranged in parallel with each other are electrically connected on the freewheeling circuit. The parallel management module comprises a battery module and a battery management module arranged in parallel with each other. The battery management module has a step-down mode and a step-up mode. The step-down mode is used for inputting the electric energy of the direct current bus to the battery module for charging. The step-up mode is used for outputting the electric energy of the battery module to the direct current bus for discharging. The application improves the safety of the direct current system of a transformer substation and can further guarantee the stable operation of a power grid.

Description

Technical Field

[0001] This invention relates to a parallel-type self-healing capacity system for batteries, belonging to the field of battery management technology. Background Technology

[0002] With the development of the national economy, people have increasingly stringent requirements for the safe operation and stable power supply of the power system. In the power system, substations, as the core hubs for power conversion and distribution, are directly related to the reliable power supply capacity of the power grid. Among them, battery banks, as an important component of the substation's DC system, are key supports for relay protection, automation devices, communication equipment, and circuit breaker operating power supplies, and their operating status has a decisive impact on power grid security.

[0003] Under normal operating conditions, the battery is in a float-charge standby state. In the event of an AC power failure or system anomaly, the battery must be put into operation instantly to provide a stable and reliable DC power supply for protection devices, control systems, and emergency handling. Especially during grid faults, system disturbances, and emergency operations, the battery system is the last line of defense to ensure the correct opening and closing of circuit breakers, the accurate operation of protection devices, and the continuous operation of communication systems. If the battery capacity is insufficient or fails, it may lead to protection devices failing to operate, malfunctioning, or switches becoming inoperable. In severe cases, it may even trigger a grid accident, causing widespread power outages and significant economic losses.

[0004] However, in actual operation and maintenance, batteries are often in a float charge state for extended periods, making their capacity degradation insidious. Traditional methods rely on periodic offline capacity testing to avoid potential problems, but these methods suffer from long testing cycles, manual operation requirements, and disruptions to system operation, making it difficult to reflect the true health status of the batteries in a timely and accurate manner. Furthermore, substations currently commonly use series-connected battery structures, which suffer from the shortcoming that "the performance of a single cell determines the overall performance." Deterioration of a single cell can lead to a decrease in the overall capacity of the entire battery pack, affecting the overall reliability of the DC system. Therefore, improvements are urgently needed. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this invention designs a parallel-type self-healing battery core capacity system, which improves the safety of the DC system of the substation and can further ensure the stable operation of the power grid.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Technical Solution 1 A parallel-type self-healing capacity-integrated battery system includes a charging circuit and a freewheeling circuit. The input terminal of the charging circuit is electrically connected to an AC power source, and the output terminal of the charging circuit is electrically connected to a DC bus. A charging device is also electrically connected to the charging circuit. Both ends of the freewheeling circuit are electrically connected to the DC bus via diodes, and multiple parallel management modules are electrically connected to the freewheeling circuit. The parallel management module includes a battery module and a battery management module connected in parallel. The battery management module has a buck mode and a boost mode. The buck mode is used to input the electrical energy from the DC bus to the battery module for charging, and the boost mode is used to output the electrical energy from the battery module to the DC bus for discharging.

[0007] Furthermore, it also includes a monitoring and analysis module, which includes a monitoring terminal and a monitoring management terminal. Each of the battery modules is electrically connected to the monitoring terminal, and the monitoring terminal and each of the battery management modules are electrically connected to the monitoring management terminal. The monitoring management terminal is used to periodically activate the battery modules.

[0008] Furthermore, multiple charging devices are provided, and the multiple charging devices are connected in parallel.

[0009] Furthermore, the charging circuit includes two parallel branches connected in parallel, each of which is electrically connected to a circuit breaker. Both circuit breakers are electrically connected to a switching switch, which is electrically connected to each charging device.

[0010] Furthermore, the battery module includes multiple batteries connected in series.

[0011] Furthermore, a temperature sensor is installed on the negative sampling line of each of the battery modules, and each of the temperature sensors is electrically connected to the monitoring terminal.

[0012] Furthermore, the discharge current of the battery module is 0.1C.

[0013] Furthermore, the battery management module is a bidirectional DC / DC converter module.

[0014] Technical Solution Two Based on the above-mentioned technical solution one, a self-healing power supply method for a parallel battery self-healing capacity system includes the following steps: a monitoring and management terminal monitors the DC bus voltage and the operating status of each parallel battery module; when the monitoring and management terminal detects that the DC bus voltage is lower than a first voltage threshold, it determines that the AC input is abnormal or the charging circuit is faulty. In response to this determination, the monitoring and management terminal controls the battery management module in at least one parallel battery module to switch to boost mode, so that the corresponding battery module discharges to the DC bus to maintain the voltage stability of the DC bus; when any one of the parallel battery modules fails or the performance of the battery module it manages deteriorates, the faulty module is automatically disconnected, and the remaining normal parallel battery modules automatically share the load to realize the system's self-healing power supply.

[0015] Technical Solution 3 Based on the above-mentioned technical solution one, a capacity verification method for a parallel battery self-healing capacity verification system includes the following steps: The monitoring and management terminal receives a capacity verification command for the target parallel battery module. In response to the command, under the premise that the DC bus is normally powered by the charging device in the charging circuit or other parallel battery modules, the monitoring and management terminal controls the target parallel battery module to discharge with the battery module it manages at a preset constant current. At the same time, the electrical energy released by the battery module is boosted and fed back to the DC bus in real time for use by the load end connected to the DC bus. The monitoring and management terminal monitors the voltage of the battery module. When the voltage of the battery module drops to the preset discharge termination voltage, it controls the battery management module to switch back to the step-down working mode and charges the battery module from the DC bus until it is fully charged. The monitoring and management terminal records the current and time data during the discharge process, calculates and outputs the actual capacity of the battery module, generates a report, and stores it.

[0016] Compared with the prior art, the present invention has the following features and beneficial effects: 1. This invention adopts a parallel battery architecture, in which each battery module operates independently. With the intelligent control of the monitoring and management terminal, when AC power fails, the charging circuit fails, or any battery module fails, the system can automatically complete the entire process of fault judgment, mode switching, fault module isolation, and load redistribution. The remaining normal modules automatically take over the load, achieving seamless self-healing power supply. Compared with the prior art, this invention fundamentally solves the reliability bottleneck of traditional series-type batteries where "single cell failure leads to the scrapping of the entire group", and significantly improves the power supply continuity of the substation DC system.

[0017] 2. This invention utilizes the bidirectional DC / DC conversion characteristics of the battery management module to feed back the electrical energy released from the battery to the DC bus in real time for load use after boosting during capacity control, thus realizing energy recovery. The entire capacity control process is automatically controlled by the monitoring and management terminal, eliminating the need for manual wiring, battery bank removal, and on-site supervision. Capacity control reports are automatically generated. Compared with existing technologies, this invention eliminates the safety risks of traditional capacity control requiring power outages, avoids energy waste, significantly shortens the capacity control time for a single group, and improves operation and maintenance efficiency by several times.

[0018] 3. This invention, through the setting of a freewheeling circuit, ensures that the diode is reverse-biased and the freewheeling circuit does not participate in operation during normal operation; when a short-circuit fault occurs and the bus voltage momentarily drops below the freewheeling circuit voltage, the diode conducts in the forward direction, and the freewheeling circuit automatically and without delay is activated, providing a large instantaneous surge current that the parallel module cannot output, driving the protection device to quickly clear the fault. Compared with the prior art, this invention combines the control advantages of the parallel architecture with the high current output capability of the series architecture, solving the key technical problem in the promotion and application of parallel DC power supply systems. Attached Figure Description

[0019] Figure 1 This is a connection block diagram of the present invention.

[0020] The attached figures are labeled as follows: 100, charging device; 200, battery module; 300, battery management module; 400, DC bus; 500, monitoring and management terminal; 600, monitoring terminal; 700, circuit breaker; 800, changeover switch; 900, load end; 1, freewheeling circuit; 2, charging circuit; 3, diode. Detailed Implementation

[0021] The present invention will now be described in more detail with reference to the embodiments.

[0022] Example 1 Please see Figure 1 The parallel-type self-healing capacity system of the battery in this embodiment includes a charging circuit 2 and a freewheeling circuit 1. The input end of the charging circuit 2 is electrically connected to the AC power supply, the output end of the charging circuit 2 is electrically connected to the DC bus 400, and a charging device 100 is electrically connected to the charging circuit 2.

[0023] Both ends of the freewheeling circuit 1 are electrically connected to the DC bus 400 through diodes 3. Multiple parallel management modules are electrically connected to the freewheeling circuit 1. The parallel management modules include battery modules 200 and battery management modules 300 connected in parallel. The battery management module 300 has a buck mode and a boost mode. The buck mode is used to input the power of the DC bus 400 to the battery module 200 for charging. The boost mode is used to output the power of the battery module 200 to the DC bus 400 for discharging.

[0024] As described above, during normal system operation, AC power is input to the charging device 100 via charging circuit 2. The charging device 100 converts the AC power into stable DC power to supply the DC bus 400, thereby powering the load terminal 900 connected to the DC bus 400. Simultaneously, each battery management module 300 operates in buck mode, reducing the voltage of the DC bus 400 to perform float charging or equalization charging on each battery module 200, keeping each battery module 200 fully charged and ready for use.

[0025] In this mode, since the freewheeling circuit 1 is connected to the DC bus 400 through the diode 3, and the conduction direction of the diode 3 is from the freewheeling circuit 1 to the DC bus 400, and the voltage of the DC bus 400 is higher than the voltage of the freewheeling circuit 1 under normal conditions, the diode 3 is in the reverse cut-off state, and the freewheeling circuit 1 does not participate in power supply.

[0026] When the AC power supply fails or charging circuit 2 malfunctions, the DC bus 400 voltage begins to drop. When the system detects that the DC bus 400 voltage is below the first voltage threshold, it immediately sends a switching command to each battery management module 300, controlling each module to switch to boost mode. At this time, the electrical energy stored in each battery module 200 is boosted by the battery management module 300 and output to the DC bus 400, maintaining the voltage stability of the DC bus 400 and achieving uninterrupted power supply to the load terminal 900.

[0027] When a battery management module 300 malfunctions or its corresponding battery module 200 experiences performance degradation, the monitoring and management terminal 500 automatically removes the faulty module from the system. The remaining normal parallel management modules automatically increase their output power to distribute the load, achieving self-healing power supply. Because each parallel management module is independent, a fault in a single module does not affect the normal operation of other modules, fundamentally solving the technical problem of "single-cell performance determining overall performance" in traditional series-connected batteries.

[0028] When a capacity verification test is required on a certain battery module 200, the maintenance personnel can issue a capacity verification command to the target battery management module 300. In response to the command, provided that the DC bus 400 is normally powered by the charging device 100 or other parallel management modules, the monitoring and management terminal 500 controls the target battery management module 300 to switch to boost mode. The battery management module 300 controls the battery module 200 under its management to discharge at a constant current of 0.1C. At the same time, the discharged electrical energy is boosted and fed back to the DC bus 400 in real time for use by the load end 900, realizing the complete recovery of discharge energy.

[0029] When the voltage of the battery module 200 drops to the preset discharge termination voltage, the control battery management module 300 switches back to the step-down working mode, and the DC bus 400 charges the battery module 200 until it is fully charged. During this process, the system records the current and time data of the discharge process, automatically calculates and outputs the actual capacity of the battery module 200.

[0030] Throughout the entire capacity verification process, the battery module 200 does not need to be removed from the system or manually connected. The discharge energy is recovered and reused instead of being consumed by the resistor, achieving efficient and safe online capacity verification.

[0031] When a short-circuit fault occurs on DC bus 400, the bus voltage momentarily drops below the second voltage threshold (the second voltage threshold is less than the first voltage threshold). At this time, the voltage of freewheeling circuit 1 is higher than the DC bus 400 voltage, diode 3 conducts in the forward direction, and freewheeling circuit 1 automatically and without delay starts working, providing a large instantaneous inrush current to the short-circuit point, driving the protective device (such as circuit breaker 700) to quickly clear the fault. After the fault is cleared, the DC bus 400 voltage recovers, freewheeling circuit 1 automatically deactivates through diode 3, and the system returns to normal operation.

[0032] Furthermore, it also includes a monitoring and analysis module, which includes a monitoring terminal 600 and a monitoring management terminal 500. Each battery module 200 is electrically connected to the monitoring terminal 600, and the monitoring terminal 600 and each battery management module 300 are electrically connected to the monitoring management terminal 500. A temperature sensor is installed on the negative sampling line of each battery module 200, and each temperature sensor is electrically connected to the monitoring terminal 600.

[0033] As can be seen from the above description, the monitoring terminal 600 can collect key parameters such as voltage, current, temperature, and internal resistance of each battery module 200 in real time, overcoming the shortcomings of battery capacity decay in traditional operation and maintenance, which is "highly concealed and difficult to detect".

[0034] The monitoring and management terminal 500 can accurately determine the health status and fault type of each battery module 200 by analyzing the data uploaded by the monitoring terminal 600 in real time. When an abnormality is detected in a module, the monitoring and management terminal 500 can automatically and quickly make an isolation decision and command the other modules to take over the load. The whole process does not require manual intervention and realizes intelligent self-healing.

[0035] Meanwhile, traditional capacity testing requires manual data recording, capacity calculation, and report generation, which is tedious and prone to errors. In this embodiment, the monitoring and management terminal 500 can automatically complete data acquisition, voltage monitoring, termination judgment, capacity calculation, and report generation during the capacity testing process. Maintenance personnel only need to click "Start Capacity Testing" on the remote monitoring platform, which greatly reduces the intensity of manual operation and the probability of errors.

[0036] In this embodiment, the monitoring and management terminal 500 is also used to periodically activate the battery module 200.

[0037] In battery management and maintenance, float charging is a common method. After a battery is fully charged, it maintains a certain voltage to preserve charge and prevent self-discharge losses. However, prolonged use of float charging can also negatively impact batteries, primarily manifesting as overcharging, individual cell voltage imbalance, and plate corrosion. Specifically, excessively high float charging voltage leads to excessive battery charge, generating large amounts of gas, which may cause casing deformation, rupture, and other safety issues. Simultaneously, float charging causes individual cell voltage imbalance, affecting battery capacity and lifespan. Furthermore, batteries in a prolonged overcharged state create an internal redox environment, accelerating plate corrosion. Therefore, regular battery activation is necessary. Multiple high-current charge-discharge cycles effectively melt crystals on the battery plates, activate chemical substances, and restore battery capacity. Typically, battery failures are primarily due to plate crystallization leading to capacity loss, while physical failures are less common. Through activation technology, battery capacity can be restored to over 90% of its rated capacity.

[0038] Traditional DC backup power supplies use batteries in a series structure, which cannot be activated online. They can only activate lagging batteries individually. If AC voltage is boosted during activation, the backup battery cannot reliably provide operating power, potentially leading to escalating accidents. In this embodiment, the battery modules 200 are operated in parallel. When activating one battery module 200, even with AC voltage boosting, the remaining battery modules 200 provide normal power to the system. This allows for online activation of the battery modules 200, thereby improving system reliability.

[0039] Furthermore, there are two charging devices 100, and the two charging devices 100 are connected in parallel. At the same time, the charging circuit 2 includes two parallel branches connected in parallel. Each parallel branch is electrically connected to a circuit breaker 700. Both circuit breakers 700 are electrically connected to a switching switch 800. The switching switch 800 is electrically connected to each charging device 100 respectively.

[0040] As can be seen from the above description, when the system is running normally, the AC power is input through two parallel branches. The circuit breakers 700 on the two parallel branches are both in the closed state. The switching switch 800 can selectively connect one or two AC power sources to the two parallel charging devices 100 at the same time. The two charging devices 100 work at the same time and jointly supply power to the DC bus 400, thereby achieving the sharing of load current.

[0041] Furthermore, the battery module 200 includes multiple batteries connected in series, and in this embodiment, there are nine battery modules 200, which are respectively five groups of 12 batteries and four groups of 11 batteries.

[0042] Furthermore, the battery management module 300 is a bidirectional DC / DC converter module.

[0043] Example 2 A self-healing power supply method for a parallel-type self-healing capacity-controlled battery system, based on the above-described embodiment one, includes the following steps: The monitoring and management terminal 500 monitors the voltage of the DC bus 400 and the operating status of each parallel battery module through the monitoring terminal 600. When the monitoring and management terminal 500 detects that the voltage of the DC bus 400 is lower than the first voltage threshold, it determines that the AC input is abnormal or the charging circuit 2 is malfunctioning. In response to this determination, the monitoring and management terminal 500 controls the battery management module 300 in each parallel battery module to switch to boost mode, so that the corresponding battery module 200 discharges to the DC bus 400 to maintain the voltage stability of the DC bus 400. When any parallel battery module fails or the performance of the battery module 200 it manages deteriorates, the faulty module is automatically disconnected, and the remaining normal parallel battery modules automatically share the load to achieve self-healing power supply of the system.

[0044] As described above, in traditional series-type battery systems, when a battery fails or the charging circuit malfunctions, manual intervention is often required for troubleshooting, isolation, and repair, during which the DC bus may lose backup power. This embodiment, through real-time monitoring and automatic control of the monitoring and management terminal 500, can quickly complete the entire process of fault diagnosis, mode switching, fault isolation, and load redistribution, achieving uninterrupted power supply to the DC bus 400 and significantly improving the continuity of power supply to the substation's DC system.

[0045] Example 3 A capacity verification method for a parallel-type self-healing battery capacity verification system, based on the above-described embodiment one, includes the following steps: The monitoring and management terminal 500 receives capacity verification instructions for the target parallel battery module. These instructions can be remote instructions issued by maintenance personnel through the remote monitoring platform, local instructions directly entered by maintenance personnel on the human-machine interface of the monitoring and management terminal 500, or timed instructions automatically triggered by the monitoring and management terminal 500 according to a preset capacity verification cycle.

[0046] In response to this instruction, provided that the DC bus 400 is normally powered by the charging device 100 in the charging circuit 2 or other parallel battery modules, the monitoring and management terminal 500 controls the target parallel battery module to discharge the battery module 200 it manages with a preset constant current. At the same time, the electrical energy discharged by the battery module 200 is boosted and fed back to the DC bus 400 in real time for use by the load terminal 900 connected to the DC bus 400. The monitoring and management terminal 500 monitors the voltage of the battery module 200 through the monitoring terminal 600. When the voltage of the battery module 200 drops to the preset discharge termination voltage, the battery management module 300 is controlled to switch back to the step-down working mode, and the DC bus 400 charges the battery module 200 until it is fully charged. The monitoring and management terminal 500 records the current and time data during the discharge process, calculates and outputs the actual capacity of the battery module 200, generates a report and stores it. In this embodiment, the monitoring and management terminal 500 stores the capacity assessment results locally and can automatically upload them to the remote monitoring platform for operation and maintenance personnel to view and analyze.

[0047] Meanwhile, in this embodiment, when multiple battery modules 200 need to be recharged sequentially, the monitoring and management terminal 500 can adopt a "A charge B discharge" assembly line operation mode, that is, while the previous parallel battery module is charging, the next parallel battery module begins to discharge. This recharge efficiency can be doubled compared to the normal process, thereby greatly improving the recharge efficiency.

[0048] As described above, traditional capacity verification methods require disconnecting the battery pack from the DC bus and connecting a dummy load for discharge. During this period, the DC system loses backup power support, posing a safety hazard. In this embodiment, the target battery module 200 remains connected to the DC bus 400 throughout the capacity verification discharge process, and the discharge energy is fed back to the bus. The DC bus 400 is always powered by the charging device 100 or other modules, ensuring the system always has backup power capability. This completely eliminates the system operation risks during the capacity verification process. Furthermore, in this embodiment, after the maintenance personnel issue the capacity verification command, all subsequent steps are automatically completed by the monitoring and management terminal 500, eliminating the need for on-site supervision. The capacity verification report is automatically generated, significantly improving maintenance efficiency. By utilizing the system's own battery management module 300 and monitoring terminal 600 to complete the capacity verification, no additional wiring or manual contact with live equipment is required, fundamentally eliminating the safety risks of on-site operations.

[0049] Regular online capacity checks can promptly identify batteries with declining capacity, allowing for timely activation or replacement to prevent further damage caused by prolonged grid connection of these batteries. Simultaneously, the charge-discharge cycles during the capacity check process help activate the battery's internal chemical substances, mitigating plate sulfation caused by prolonged float charging, thus positively impacting battery lifespan.

[0050] The working principle of this invention is as follows: During normal system operation, AC power is input to the charging device 100 via charging circuit 2. The charging device 100 converts the AC power into stable DC power to supply the DC bus 400, thereby powering the load terminal 900 connected to the DC bus 400. Simultaneously, each battery management module 300 operates in buck mode, reducing the voltage of the DC bus 400 to perform float charging or equalization charging on each battery module 200, keeping each battery module 200 fully charged and ready for use.

[0051] In this mode, since the freewheeling circuit 1 is connected to the DC bus 400 through the diode 3, and the conduction direction of the diode 3 is from the freewheeling circuit 1 to the DC bus 400, and the voltage of the DC bus 400 is higher than the voltage of the freewheeling circuit 1 under normal conditions, the diode 3 is in the reverse cut-off state, and the freewheeling circuit 1 does not participate in power supply.

[0052] When the AC power supply fails or charging circuit 2 malfunctions, the DC bus 400 voltage begins to drop. When the system detects that the DC bus 400 voltage is below the first voltage threshold, it immediately sends a switching command to each battery management module 300, controlling each module to switch to boost mode. At this time, the electrical energy stored in each battery module 200 is boosted by the battery management module 300 and output to the DC bus 400, maintaining the voltage stability of the DC bus 400 and achieving uninterrupted power supply to the load terminal 900.

[0053] When a battery management module 300 malfunctions or its corresponding battery module 200 experiences performance degradation, the monitoring and management terminal 500 automatically removes the faulty module from the system. The remaining normal parallel management modules automatically increase their output power to distribute the load, achieving self-healing power supply. Because each parallel management module is independent, a fault in a single module does not affect the normal operation of other modules, fundamentally solving the technical problem of "single-cell performance determining overall performance" in traditional series-connected batteries.

[0054] When a capacity verification test is required on a certain battery module 200, the maintenance personnel can issue a capacity verification command to the target battery management module 300. In response to the command, provided that the DC bus 400 is normally powered by the charging device 100 or other parallel management modules, the monitoring and management terminal 500 controls the target battery management module 300 to switch to boost mode. The battery management module 300 controls the battery module 200 under its management to discharge at a constant current of 0.1C. At the same time, the discharged electrical energy is boosted and fed back to the DC bus 400 in real time for use by the load end 900, realizing the complete recovery of discharge energy.

[0055] When the voltage of the battery module 200 drops to the preset discharge termination voltage, the control battery management module 300 switches back to the step-down working mode, and the DC bus 400 charges the battery module 200 until it is fully charged. During this process, the system records the current and time data of the discharge process, automatically calculates and outputs the actual capacity of the battery module 200.

[0056] Throughout the entire capacity verification process, the battery module 200 does not need to be removed from the system or manually connected. The discharge energy is recovered and reused instead of being consumed by the resistor, achieving efficient and safe online capacity verification.

[0057] When a short-circuit fault occurs on DC bus 400, the bus voltage momentarily drops below the second voltage threshold (the second voltage threshold is less than the first voltage threshold). At this time, the voltage of freewheeling circuit 1 is higher than the DC bus 400 voltage, diode 3 conducts in the forward direction, and freewheeling circuit 1 automatically and without delay starts working, providing a large instantaneous inrush current to the short-circuit point, driving the protective device (such as circuit breaker 700) to quickly clear the fault. After the fault is cleared, the DC bus 400 voltage recovers, freewheeling circuit 1 automatically deactivates through diode 3, and the system returns to normal operation.

[0058] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A parallel-type self-healing capacity-integrated battery system, characterized in that: It includes a charging circuit (2) and a freewheeling circuit (1). The input end of the charging circuit (2) is electrically connected to an AC power source, and the output end of the charging circuit (2) is electrically connected to a DC bus (400). A charging device (100) is electrically connected to the charging circuit (2). Both ends of the freewheeling circuit (1) are electrically connected to the DC bus (400) through diodes (3), and multiple parallel management modules are electrically connected to the freewheeling circuit (1). The parallel management modules include battery modules (200) and battery management modules (300) connected in parallel. The battery management module (300) has a buck mode and a boost mode. The buck mode is used to input the electrical energy of the DC bus (400) to the battery module (200) for charging, and the boost mode is used to output the electrical energy of the battery module (200) to the DC bus (400) for discharging.

2. The parallel-type self-healing capacity system for batteries according to claim 1, characterized in that: It also includes a monitoring and analysis module, which includes a monitoring terminal (600) and a monitoring management terminal (500). Each of the battery modules (200) is electrically connected to the monitoring terminal (600). The monitoring terminal (600) and each of the battery management modules (300) are electrically connected to the monitoring management terminal (500). The monitoring management terminal (500) is used to periodically activate the battery modules (200).

3. The parallel-type self-healing capacity system for batteries according to claim 1, characterized in that: Multiple charging devices (100) are provided, and the multiple charging devices (100) are connected in parallel.

4. The parallel-type self-healing capacity system for batteries according to claim 3, characterized in that: The charging circuit (2) includes two parallel branches connected in parallel. Each parallel branch is electrically connected to a circuit breaker (700). Both circuit breakers (700) are electrically connected to a switching switch (800). The switching switch (800) is electrically connected to each charging device (100).

5. A parallel-type self-healing capacity-integrated battery system according to claim 1, characterized in that: The battery module (200) includes multiple batteries connected in series.

6. A parallel-type self-healing capacity-integrated battery system according to claim 2, characterized in that: Each of the battery modules (200) is equipped with a temperature sensor on its negative sampling line, and each of the temperature sensors is electrically connected to the monitoring terminal (600).

7. A parallel-type self-healing capacity-integrated battery system according to claim 1, characterized in that: The current during the discharge of the battery module (200) is 0.1C.

8. A parallel-type self-healing capacity-integrated battery system according to claim 1, characterized in that: The battery management module (300) is a bidirectional DC / DC converter module.

9. A self-healing power supply method based on the parallel-type self-healing core capacity system of any one of claims 1-8, characterized in that: The process includes the following steps: The monitoring and management terminal (500) monitors the voltage of the DC bus (400) and the operating status of each parallel battery module through the monitoring terminal (600); when the monitoring and management terminal (500) detects that the voltage of the DC bus (400) is lower than the first voltage threshold, it determines that the AC input is abnormal or the charging circuit (2) is faulty. In response to this determination, the monitoring and management terminal (500) controls the battery management module (300) in at least one parallel battery module to switch to the boost working mode, so that the corresponding battery module (200) discharges to the DC bus (400) to maintain the voltage stability of the DC bus (400); when any one of the parallel battery modules fails or the performance of the battery module (200) it manages deteriorates, the faulty module is automatically removed, and the remaining normal parallel battery modules automatically share the load to realize the system's self-healing power supply.

10. A capacity integration method for a parallel-type self-healing battery capacity integration system according to any one of claims 1-8, characterized in that: Includes the following steps: The monitoring and management terminal (500) receives the capacity control instruction for the target parallel battery module. In response to the instruction, under the premise that the DC bus (400) is normally powered by the charging device (100) in the charging circuit (2) or other parallel battery modules, the monitoring and management terminal (500) controls the target parallel battery module to discharge the battery module (200) it manages with a preset constant current. At the same time, the electrical energy released by the battery module (200) is boosted and fed back to the DC bus (400) in real time for use by the load terminal (900) connected to the DC bus (400). The monitoring and management terminal (500) monitors the voltage of the battery module (200) through the monitoring terminal (600). When the voltage of the battery module (200) drops to the preset discharge termination voltage, the battery management module (300) is controlled to switch back to the step-down working mode and the battery module (200) is charged by the DC bus (400) until it is fully charged. The monitoring and management terminal (500) records the current and time data of the discharge process, calculates and outputs the actual capacity of the battery module (200), generates a report and stores it.

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