A two-stage hard-parallel UPS module lithium battery system

Abstract

The present invention proposes a two-level hard-parallel UPS module lithium battery system, including a UPS module and a battery module, the battery module includes a high-voltage box, a junction box and N clusters of parallel battery cells, the UPS module is electrically connected to the high-voltage box, and the high-voltage box is electrically connected to the battery cell through the junction box; the UPS module is provided with a first communication port, the high-voltage box is provided with a second communication port and a third communication port, and the battery cell is provided with a fourth communication port, the first communication port is connected to the second communication port, and the third communication port is connected to the fourth communication port. The high-voltage box obtains and summarizes the battery cell status information through the third communication port, and feeds back the status information and the battery cell status information to the UPS module through the second communication port. The UPS module adjusts the charging and discharging power of the high-voltage box circuit and the battery cell according to the status information. The present application can expand the battery capacity of the system by adding multiple battery cells in parallel to meet the user's demand for battery capacity.

Description

Technical Field

[0001] The present invention relates to the field of battery circuits, and in particular to a two-level hard-parallel UPS module lithium battery system. Background Art

[0002] UPS module is designed to solve the problem of uninterrupted power supply. It is a system device that connects the battery to the host and converts DC power into AC power through the host inverter and other module circuits. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment.

[0003] Currently, most UPS modules are matched with lead-acid batteries or simple lithium batteries. In production and use, it is difficult to understand the power and status of the battery system, and simple transformation cannot solve the market demand for battery capacity. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention proposes a two-level hard-parallel UPS module lithium battery system, which solves the problem of insufficient battery capacity in the lithium battery system in the prior art.

[0005] The technical solution of the present invention is implemented as follows: a two-level hard-parallel UPS module lithium battery system, including a UPS module and a battery module,

[0006] The battery module includes a high-voltage box, a combiner box and N clusters of battery units connected in parallel. The UPS module is electrically connected to the high-voltage box, and the high-voltage box is electrically connected to the battery unit through the combiner box.

[0007] The UPS module is provided with a first communication port, the high-voltage box is provided with a second communication port and a third communication port, and the battery unit is provided with a fourth communication port, the first communication port is connected to the second communication port, and the third communication port is connected to the fourth communication port. The high-voltage box obtains and summarizes the battery unit status information through the third communication port, and feeds back the status information and the battery unit status information to the UPS module through the second communication port. The UPS module adjusts the charging and discharging power of the high-voltage box circuit and the battery unit according to the status information.

[0008] Optionally, the UPS module includes a filter, a maintenance Su1, a bypass Su2, an input Su3, a static Su4, a static Su5, an output Su6, a rectifier, an inverter, a charger, an input port, an output port, a battery input port, and a first communication port;

[0009] The output end of the input port is connected to the input end of the filter, the output end of the filter is respectively connected to the input end of the charger, the input end of input Su3, the input end of bypass Su2 and the input end of maintenance Su1, the output end of the charger is respectively connected to the output end of the rectifier, the input end of the inverter and the input end of the battery input port, the output end of input Su3 is connected to the input end of the rectifier, the output end of the rectifier is respectively connected to the output end of the charger and the input end of the inverter, the output end of the inverter is connected to the input end of the static Su5, the output end of the static Su5 is respectively connected to the output end of the static Su4 and the input end of the output Su6, the output end of the output Su6 is connected to the output end of the maintenance Su1 and the input end of the output port, and the first communication port is connected to the second communication port of the high-voltage box;

[0010] When charging, the AC power is input through the input port of the UPS module, filtered by the filter, and then output to the battery input port through the charger to charge the battery module; when discharging, the power output by the battery module is connected through the battery input port, and the DC is converted into AC through the rectifier to power the load.

[0011] Optionally, the high-voltage box includes a pre-charge relay S1, a total positive relay S2, a charging relay S3, a DC internal relay S4, a DC external relay S5, an air breaker switch S6, a neutral relay S7, a total negative relay S8, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a wake-up button K1, a pre-charge resistor R1, a fuse 1, a fuse 2, a BCU, a second communication port, a third communication port, a Hall sensor and a BCU;

[0012] The output end of the first communication port of the UPS module is connected to the input end of the second communication port of the high-voltage box, the output end of the second communication port is connected to the input end of the BCU, and the output end of the BCU is connected to the input end of the third communication port;

[0013] The positive electrode of the battery input port is respectively connected to the negative electrode of the diode D1, the input end of the charging relay S3 and the positive electrode of the diode D3, the positive electrode of the diode D1 is respectively connected to the input end of the pre-charging resistor R1, the output end of the charging relay S3 and the input end of the total positive relay S2, the output end of the pre-charging resistor R1 is connected to the input end of the pre-charging relay S1, the output end of the pre-charging relay S1 is respectively connected to the output end of the total positive relay S2, the input end of the Hall sensor and the positive electrode of the diode D2, the output end of the Hall sensor is connected to the input of the fuse 2, and the output of the fuse 2 is connected to the junction box;

[0014] The cathode of diode D2 is respectively connected to the input end of wake-up button K1 and the input end of DC internal relay S4, the output end of DC internal relay S4 is respectively connected to the output end of wake-up button K1, the input end of DC external relay S5 and the input end of circuit breaker S6, the output end of DC external relay S5 is connected to the cathode of diode D3, the output end of circuit breaker S6 is connected to the input end of switching power supply, the output end of switching power supply is connected to the input end of fuse 1, the output end of fuse 1 is respectively connected to the anode of diode D4 and the anode of diode D5, the cathode of diode D4 is respectively connected to the input end of total negative relay S8 and junction box; the output end of total negative relay S8 is respectively connected to the cathode of diode D5 and the cathode of battery input port;

[0015] The neutral line of the battery input port is connected to the input end of the neutral line relay S7, and the output end of the neutral line relay S7 is connected to the combiner box.

[0016] Optionally, the combiner box includes a pre-charging resistor R11, a pre-charging group Rn1, a pre-charging resistor R12, a pre-charging resistor Rn2, a total positive 1 relay K11, a total positive pre-charging 1 relay K12, a total positive N relay Kn1, a total positive pre-charging N relay Kn2, a neutral line 1 relay K13, a neutral line pre-charging 1 relay K14, a neutral line N relay Kn3 and a neutral line pre-charging N relay Kn4;

[0017] Fuse 2 is connected to the input end of total positive 1 relay K11 and the input end of total positive N relay Kn1, the output end of total positive 1 relay K11 is connected to the input end of total positive pre-charge 1 relay K12 and battery unit 1; the output end of total positive N relay Kn1 is connected to the input end of total positive pre-charge N relay Kn2 and battery unit N, the output end of total positive pre-charge 1 relay K12 is connected to the input end of pre-charge resistor R11, the output end of pre-charge resistor R11 is connected to the input end of pre-charge group Rn1, and the output end of pre-charge resistor Rn1 is connected to the output end of total positive pre-charge N relay Kn2;

[0018] The output end of the neutral relay S7 is connected to the input end of the neutral relay K13 and the input end of the neutral relay Kn3; the output end of the neutral relay K13 is connected to the input end of the neutral pre-charge 1 relay K14 and the battery unit 1, the output end of the neutral pre-charge 1 relay K14 is connected to the input end of the neutral pre-charge N relay Kn4 and the battery unit N, the output end of the neutral pre-charge 1 relay K14 is connected to the input end of the pre-charge resistor R12, the output end of the pre-charge resistor R12 is connected to the input end of the pre-charge resistor Rn2, and the output end of the pre-charge resistor Rn2 is connected to the output end of the neutral pre-charge N relay Kn4;

[0019] The cathode of the diode D4 and the input end of the total negative relay S8 are connected to the negative electrode of the battery unit through the combiner box.

[0020] Optionally, the process of hard parallel connection of battery cells includes the following steps:

[0021] Control the closing of the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2, so that the current flows through the pre-charge resistor R11 and the pre-charge group Rn1, and the total voltage of two or more battery cells is balanced;

[0022] After balancing, close the total positive 1 relay K11 and the total positive N relay Kn1, and open the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2;

[0023] Controlling the closing of the neutral pre-charge 1 relay K14 and the neutral pre-charge N relay Kn4, so that the neutral voltages of two or more battery cells are balanced by the current flowing through the pre-charge resistor R12 and the pre-charge resistor Rn2;

[0024] After balancing, close the neutral line 1 relay K13 and the neutral line N relay Kn3, and disconnect the neutral line pre-charge 1 relay K14 and the neutral line pre-charge N relay Kn4.

[0025] Optionally, each battery unit includes multiple battery packs connected in series; the battery pack includes a slave control unit BMU of the lithium battery management system, a lithium battery, a communication port 11 of the battery pack and a communication port 21 of the battery pack; the output end of the total positive 1 relay K11 is connected to the input end of the total positive pre-charge 1 relay K12 and the positive pole of the battery pack, and the negative pole of the battery pack is connected to the input end of the total negative relay S8 and the negative pole of the diode D4.

[0026] Optionally, when the UPS module is charging the lithium battery pack, if the lithium battery has over-temperature, over-current, or over-voltage faults, the BCU controller first controls the DC external relay S5, the charging relay S3, and the neutral relay S7 to disconnect, and then the BCU controller closes the DC external relay S5, the charging relay S3, and the neutral relay S7 after the preset conditions are restored to protect the battery unit from charging.

[0027] Optionally, when the UPS module is discharging the lithium battery pack, if the lithium battery has over-temperature, over-current, or under-voltage faults, the BCU controller first controls the total positive relay S2, the total negative relay S8, and the neutral relay S7 to disconnect, and then the BCU controller closes the total positive relay S2, the total negative relay S8, and the neutral relay S7 after the preset conditions are restored to protect the battery unit from discharge.

[0028] Compared with the prior art, the present application has the following advantages: the present application adds a high-voltage box, a junction box and a battery unit on the basis of the UPS module, and sets a communication port on the high-voltage box and the battery unit to timely feedback the data of the detected battery cell voltage and temperature so as to perform maintenance in time. At the same time, the addition of the junction box makes it possible to design multiple parallel battery units to expand the battery capacity of the system and meet the demand for battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 The present invention is a schematic diagram of the circuit structure of a two-stage hard-parallel UPS module lithium battery system. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only a unit embodiment of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1 A two-level hard-parallel UPS module lithium battery system includes a UPS module and a battery module. The battery module includes a high-voltage box, a combiner box and N clusters of parallel battery units. The UPS module is electrically connected to the high-voltage box, and the high-voltage box is electrically connected to the battery unit through the combiner box. Specifically, N is an integer and can be matched according to actual needs.

[0034] The UPS module is provided with a first communication port, the high-voltage box is provided with a second communication port and a third communication port, and the battery unit is provided with a fourth communication port, the first communication port is connected to the second communication port, and the third communication port is connected to the fourth communication port. The high-voltage box obtains and summarizes the battery unit status information through the third communication port, and feeds back the status information and the battery unit status information to the UPS module through the second communication port. The UPS module adjusts the charging and discharging power of the high-voltage box circuit and the battery unit according to the status information.

[0035] Further, the UPS module includes a filter, a maintenance Su1, a bypass Su2, an input Su3, a static Su4, a static Su5, an output Su6, a rectifier, an inverter, a charger, an input port, an output port, a battery input port, and a first communication port;

[0036] The output end of the input port is connected to the input end of the filter, the output end of the filter is respectively connected to the input end of the charger, the input end of input Su3, the input end of bypass Su2 and the input end of maintenance Su1, the output end of the charger is respectively connected to the output end of the rectifier, the input end of the inverter and the input end of the battery input port, the output end of input Su3 is connected to the input end of the rectifier, the output end of the rectifier is respectively connected to the output end of the charger and the input end of the inverter, the output end of the inverter is connected to the input end of the static Su5, the output end of the static Su5 is respectively connected to the output end of the static Su4 and the input end of the output Su6, the output end of the output Su6 is connected to the output end of the maintenance Su1 and the input end of the output port, and the first communication port is connected to the second communication port of the high-voltage box;

[0037] When charging, the AC power is input through the input port of the UPS module, filtered by the filter, and then output to the battery input port through the charger to charge the battery module; when discharging, the power output by the battery module is connected through the battery input port, and the DC is converted into AC through the rectifier to power the load.

[0038] Further, the high-voltage box includes a pre-charge relay S1, a total positive relay S2, a charging relay S3, a DC internal relay S4, a DC external relay S5, an air switch S6, a neutral relay S7, a total negative relay S8, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a wake-up button K1, a pre-charge resistor R1, a fuse 1, a fuse 2, a BCU, a second communication port, a third communication port, a Hall sensor and a BCU;

[0039] The output end of the first communication port of the UPS module is connected to the input end of the second communication port of the high-voltage box, the output end of the second communication port is connected to the input end of the BCU, and the output end of the BCU is connected to the input end of the third communication port;

[0040] The positive electrode of the battery input port is respectively connected to the negative electrode of the diode D1, the input end of the charging relay S3 and the positive electrode of the diode D3, the positive electrode of the diode D1 is respectively connected to the input end of the pre-charging resistor R1, the output end of the charging relay S3 and the input end of the total positive relay S2, the output end of the pre-charging resistor R1 is connected to the input end of the pre-charging relay S1, the output end of the pre-charging relay S1 is respectively connected to the output end of the total positive relay S2, the input end of the Hall sensor and the positive electrode of the diode D2, the output end of the Hall sensor is connected to the input of the fuse 2, and the output of the fuse 2 is connected to the junction box;

[0041] The cathode of diode D2 is respectively connected to the input end of wake-up button K1 and the input end of DC internal relay S4, the output end of DC internal relay S4 is respectively connected to the output end of wake-up button K1, the input end of DC external relay S5 and the input end of circuit breaker S6, the output end of DC external relay S5 is connected to the cathode of diode D3, the output end of circuit breaker S6 is connected to the input end of switching power supply, the output end of switching power supply is connected to the input end of fuse 1, the output end of fuse 1 is respectively connected to the anode of diode D4 and the anode of diode D5, the cathode of diode D4 is respectively connected to the input end of total negative relay S8 and junction box; the output end of total negative relay S8 is respectively connected to the cathode of diode D5 and the cathode of battery input port;

[0042] The neutral line of the battery input port is connected to the input end of the neutral line relay S7, and the output end of the neutral line relay S7 is connected to the combiner box. Specifically, the use of the wake-up button K1 sets the system to two modes, one is manual start and the other is automatic start. When a problem occurs, there is a backup plan to improve the utilization rate of the system.

[0043] Further, the combiner box includes a pre-charging resistor R11, a pre-charging group Rn1, a pre-charging resistor R12, a pre-charging resistor Rn2, a total positive 1 relay K11, a total positive pre-charging 1 relay K12, a total positive N relay Kn1, a total positive pre-charging N relay Kn2, a neutral line 1 relay K13, a neutral line pre-charging 1 relay K14, a neutral line N relay Kn3 and a neutral line pre-charging N relay Kn4;

[0044] Fuse 2 is connected to the input end of total positive 1 relay K11 and the input end of total positive N relay Kn1, the output end of total positive 1 relay K11 is connected to the input end of total positive pre-charge 1 relay K12 and battery unit 1; the output end of total positive N relay Kn1 is connected to the input end of total positive pre-charge N relay Kn2 and battery unit N, the output end of total positive pre-charge 1 relay K12 is connected to the input end of pre-charge resistor R11, the output end of pre-charge resistor R11 is connected to the input end of pre-charge group Rn1, and the output end of pre-charge resistor Rn1 is connected to the output end of total positive pre-charge N relay Kn2;

[0045] The output end of the neutral relay S7 is connected to the input end of the neutral relay K13 and the input end of the neutral relay Kn3; the output end of the neutral relay K13 is connected to the input end of the neutral pre-charge 1 relay K14 and the battery unit 1, the output end of the neutral pre-charge 1 relay K14 is connected to the input end of the neutral pre-charge N relay Kn4 and the battery unit N, the output end of the neutral pre-charge 1 relay K14 is connected to the input end of the pre-charge resistor R12, the output end of the pre-charge resistor R12 is connected to the input end of the pre-charge resistor Rn2, and the output end of the pre-charge resistor Rn2 is connected to the output end of the neutral pre-charge N relay Kn4;

[0046] The cathode of the diode D4 and the input end of the total negative relay S8 are connected to the negative electrode of the battery unit through the combiner box.

[0047] Furthermore, each battery unit includes a plurality of battery packs connected in series; the battery pack includes a slave control unit BMU of a lithium battery management system, a lithium battery, a communication port 11 of the battery pack, and a communication port 21 of the battery pack; the output end of the total positive 1 relay K11 is connected to the input end of the total positive pre-charge 1 relay K12 and the positive electrode of the battery pack, and the negative electrode of the battery pack is connected to the input end of the total negative relay S8 and the negative electrode of the diode D4.

[0048] In a specific embodiment, the operation process of the two-stage hard-parallel UPS module lithium battery system is as follows:

[0049] 1) In the initial state, the pre-charge relay S1, the total positive relay S2, the charging relay S3, the DC internal relay S4, the DC external relay S5, the circuit breaker S6, the neutral relay S7, and the total negative relay S8 are all in the disconnected state; the total positive 1 relay K11, the total positive pre-charge 1 relay K12, the total positive N relay Kn1, the total positive pre-charge N relay Kn2, the neutral 1 relay K13, the neutral pre-charge 1 relay K14, the neutral N relay Kn3, and the neutral pre-charge N relay Kn4; the DC external relay S5 is in the closed state;

[0050] 2) Hard parallel process: close the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2, and balance the total voltage of two or more battery cells by closing K12 and Kn2, circulating through the pre-charge resistor R11 and the pre-charge group Rn1. After the total battery voltage is averaged, close the total positive 1 relay K11 and the total positive N relay Kn1, and disconnect the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2; finally, close the neutral pre-charge 1 relay K14 and the neutral pre-charge N relay Kn4, and circulate through the pre-charge resistor R12 and the pre-charge resistor Rn2 to balance the neutral voltage of two or more battery cells. After the average neutral total voltage is balanced, close the neutral 1 relay K13 and the neutral N relay Kn3, and disconnect the neutral pre-charge 1 relay K14 and the neutral pre-charge N relay Kn4;

[0051] 3) Startup status: There are two startup modes for this system: manual startup and charging startup. The specific methods are as follows:

[0052] 31) Manual start operation: Close the circuit breaker S6, and then manually press the wake-up button K1. At this time, the switch power is turned on and 12V power is provided to the BCU. The BCU performs self-test. If the self-test fails, a fault is reported and the system performs maintenance. If the self-test is successful, the pre-charge process is performed. First, close the total negative relay S8, then close the charging relay S3, and finally close the pre-charge relay S1. At this time, compare the external total pressure data with the internal total pressure data. After comparison, when the external total pressure data is 90% of the internal total pressure data, close the total positive relay S2, then open the pre-charge relay S1, and finally close the neutral relay S7, which means the start is successful.

[0053] 32) Charging start operation: The UPS module outputs voltage through the positive and negative poles, and the switching power supply works to provide 12V power to the BCU. The BCU performs self-test. If the self-test fails, a fault is reported and the system performs maintenance. If the self-test is successful, the pre-charging process is performed. The BCU first closes the total negative relay S8, then the charging relay S3, and finally the pre-charging relay S1. At this time, the external total pressure data is compared with the internal total pressure data. After the comparison, when the external total pressure data is 90% of the internal total pressure data, the total positive relay S2 is closed, and then the pre-charging relay S1 is opened. Finally, the neutral relay S7 is closed, which means the start is successful.

[0054] 4) Charging state: The mains inputs current through the input port of the UPS module, and the current flows into the filter for filtering. After filtering, it enters the charger to convert the AC power into DC power. After conversion, it flows into the high-voltage box and M groups of battery units connected in series through the positive, neutral and negative poles of the battery input port for charging;

[0055] 5) Charging protection operation: BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) disconnects the DC external relay S5, charging relay S3 and neutral relay S7, and the charging circuit is cut off at this time. After the circuit is in a safe state (such as after a delay of one minute or the current value, voltage value, and temperature value have dropped below the preset value), BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) closes the DC external relay S5, charging relay S3 and neutral relay S7;

[0056] 6) Discharge state: The positive pole, neutral line and negative pole of the UPS module battery input port are connected to the battery module, the inverter is turned on, the static switch Su5 is closed, and then the switch Su6 is closed. The system discharges through the output port;

[0057] 7) Discharge protection operation: BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) disconnects the total positive relay S2, the total negative relay S8 and the neutral relay S7, and the discharge circuit is cut off at this time. After the circuit is in a safe state (such as after a delay of one minute or the current value, voltage value, and temperature value have dropped below the preset value), BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) closes the total positive relay S2, the total negative relay S8 and the neutral relay S7;

[0058] 8) Power-off operation: BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) disconnects the charging relay S3, the total positive relay S2, the total negative relay S8, the neutral relay S7 and the circuit breaker S6, cuts off the switch power circuit, and the BCU (battery management system, located in the high-voltage box, is the main control system of the high-voltage box) enters the shutdown state;

[0059] To summarize, the present application adds a high-voltage box, a combiner box and a battery unit on the basis of the UPS module, and sets a communication port on the high-voltage box and the battery unit to timely feedback the data of the battery cell voltage and temperature so as to perform maintenance in time. At the same time, the addition of the combiner box makes it possible to design multiple parallel battery units to expand the battery capacity of the system and meet the demand for battery capacity.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage hard-parallel UPS module lithium battery system, characterized in that: Including UPS module and battery module, The battery module includes a high-voltage box, a combiner box and N clusters of battery units connected in parallel, the UPS module is electrically connected to the high-voltage box, and the high-voltage box is electrically connected to the battery unit through the combiner box; The UPS module is provided with a first communication port, the high-voltage box is provided with a second communication port and a third communication port, the battery unit is provided with a fourth communication port, the first communication port is connected to the second communication port, and the third communication port is connected to the fourth communication port; the high-voltage box obtains and summarizes the status information of the battery unit through the third communication port, and feeds back the status information and the status information of the battery unit to the UPS module through the second communication port, and the UPS module adjusts the charging and discharging power of the high-voltage box circuit and the battery unit according to the status information; The UPS module includes a filter, a maintenance Su1, a bypass Su2, an input Su3, a static Su4, a static Su5, an output Su6, a rectifier, an inverter, a charger, an input port, an output port, a battery input port and a first communication port; The output end of the input port is connected to the input end of the filter, and the output end of the filter is respectively connected to the input end of the charger, the input end of the input Su3, the input end of the bypass Su2 and the input end of the maintenance Su1, the output end of the charger is respectively connected to the output end of the rectifier, the input end of the inverter and the input end of the battery input port, the output end of the input Su3 is connected to the input end of the rectifier, the output end of the rectifier is respectively connected to the output end of the charger and the input end of the inverter, the output end of the inverter is connected to the input end of the static Su5, the output end of the static Su5 is respectively connected to the output end of the static Su4 and the input end of the output Su6, the output end of the output Su6 is connected to the output end of the maintenance Su1 and the input end of the output port, and the first communication port is connected to the second communication port of the high-voltage box; When charging, the city power is input through the input port of the UPS module, filtered by the filter, and then output to the battery input port through the charger to charge the battery module; when discharging, the power output by the battery module is connected through the battery input port, and the DC is converted into AC by the rectifier to power the load; The high-voltage box includes a pre-charge relay S1, a total positive relay S2, a charging relay S3, a DC internal relay S4, a DC external relay S5, an air switch S6, a neutral relay S7, a total negative relay S8, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a wake-up button K1, a pre-charge resistor R1, a fuse 1, a fuse 2, a BCU, a second communication port, a third communication port and a Hall sensor; The output end of the first communication port of the UPS module is connected to the input end of the second communication port of the high-voltage box, the output end of the second communication port is connected to the input end of the BCU, and the output end of the BCU is connected to the input end of the third communication port; The positive electrode of the battery input port is respectively connected to the negative electrode of the diode D1, the input end of the charging relay S3 and the positive electrode of the diode D3, the positive electrode of the diode D1 is respectively connected to the input end of the pre-charging resistor R1, the output end of the charging relay S3 and the input end of the total positive relay S2, the output end of the pre-charging resistor R1 is connected to the input end of the pre-charging relay S1, the output end of the pre-charging relay S1 is respectively connected to the output end of the total positive relay S2, the input end of the Hall sensor and the positive electrode of the diode D2, the output end of the Hall sensor is connected to the input of the fuse 2, and the output of the fuse 2 is connected to the combiner box; The cathode of the diode D2 is respectively connected to the input end of the wake-up button K1 and the input end of the DC internal relay S4, the output end of the DC internal relay S4 is respectively connected to the output end of the wake-up button K1, the input end of the DC external relay S5 and the input end of the circuit breaker S6, the output end of the DC external relay S5 is connected to the cathode of the diode D3, the output end of the circuit breaker S6 is connected to the input end of the switching power supply, the output end of the switching power supply is connected to the input end of the fuse 1, the output end of the fuse 1 is respectively connected to the anode of the diode D4 and the anode of the diode D5, the cathode of the diode D4 is respectively connected to the input end of the total negative relay S8 and the combiner box; the output end of the total negative relay S8 is respectively connected to the cathode of the diode D5 and the cathode of the battery input port; The neutral line of the battery input port is connected to the input end of the neutral line relay S7, and the output end of the neutral line relay S7 is connected to the combiner box; When the UPS module is charging the lithium battery pack, if the lithium battery has over-temperature, over-current, or over-voltage faults, the BCU controller first controls the DC external relay S5, charging relay S3, and neutral relay S7 to disconnect, and then closes the DC external relay S5, charging relay S3, and neutral relay S7 after the preset conditions are restored to protect the battery unit from charging.

2. A two-stage hard-parallel UPS module lithium battery system as claimed in claim 1, characterized in that: The combiner box includes a pre-charging resistor R11, a pre-charging group Rn1, a pre-charging resistor R12, a pre-charging resistor Rn2, a total positive 1 relay K11, a total positive pre-charging 1 relay K12, a total positive N relay Kn1, a total positive pre-charging N relay Kn2, a neutral line 1 relay K13, a neutral line pre-charging 1 relay K14, a neutral line N relay Kn3 and a neutral line pre-charging N relay Kn4; The fuse 2 is connected to the input end of the total positive 1 relay K11 and the input end of the total positive N relay Kn1, and the output end of the total positive 1 relay K11 is connected to the input end of the total positive pre-charge 1 relay K12 and the battery unit 1; the output end of the total positive N relay Kn1 is connected to the input end of the total positive pre-charge N relay Kn2 and the battery unit N, the output end of the total positive pre-charge 1 relay K12 is connected to the input end of the pre-charge resistor R11, the output end of the pre-charge resistor R11 is connected to the input end of the pre-charge group Rn1, and the output end of the pre-charge resistor Rn1 is connected to the output end of the total positive pre-charge N relay Kn2; The output end of the neutral line relay S7 is connected to the input end of the neutral line 1 relay K13 and the input end of the neutral line N relay Kn3; the output end of the neutral line 1 relay K13 is connected to the input end of the neutral line pre-charge 1 relay K14 and the battery unit 1, the output end of the neutral line pre-charge 1 relay K14 is connected to the input end of the neutral line pre-charge N relay Kn4 and the battery unit N, the output end of the neutral line pre-charge 1 relay K14 is connected to the input end of the pre-charge resistor R12, the output end of the pre-charge resistor R12 is connected to the input end of the pre-charge resistor Rn2, and the output end of the pre-charge resistor Rn2 is connected to the output end of the neutral line pre-charge N relay Kn4; The cathode of the diode D4 and the input end of the total negative relay S8 are connected to the cathode of the battery unit through the combiner box.

3. A two-stage hard-parallel UPS module lithium battery system as claimed in claim 2, characterized in that: The process of hard parallel connection of battery cells includes the following steps: Control the closing of the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2, so that the current flows through the pre-charge resistor R11 and the pre-charge group Rn1, and the total voltage of two or more clusters of battery cells is balanced; After balancing, the total positive 1 relay K11 and the total positive N relay Kn1 are closed, and the total positive pre-charge 1 relay K12 and the total positive pre-charge N relay Kn2 are opened; Controlling the closing of the neutral pre-charge 1 relay K14 and the neutral pre-charge N relay Kn4, and balancing the neutral voltages of two or more battery cells by allowing current to flow through the pre-charge resistor R12 and the pre-charge resistor Rn2; After balancing, the neutral line 1 relay K13 and the neutral line N relay Kn3 are closed, and the neutral line pre-charge 1 relay K14 and the neutral line pre-charge N relay Kn4 are opened.

4. A two-stage hard-parallel UPS module lithium battery system as claimed in claim 2, characterized in that: Each of the battery cells includes a plurality of battery packs connected in series; the battery pack includes a slave control unit BMU of a lithium battery management system, a lithium battery, a communication port 11 of the battery pack, and a communication port 21 of the battery pack; the output end of the total positive 1 relay K11 is connected to the input end of the total positive pre-charge 1 relay K12 and the positive electrode of the battery pack, and the negative electrode of the battery pack is connected to the input end of the total negative relay S8 and the negative electrode of the diode D4.

5. A two-stage hard-parallel UPS module lithium battery system as claimed in claim 1, characterized in that: When the UPS module is discharging the lithium battery pack, if the lithium battery has over-temperature, over-current, or under-voltage faults, the BCU controller first controls the total positive relay S2, the total negative relay S8, and the neutral relay S7 to disconnect, and then closes the total positive relay S2, the total negative relay S8, and the neutral relay S7 after the preset conditions are restored to protect the battery unit from discharge.

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