Box-type power supply energy storage system for ship

Abstract

The utility model provides a ship box-type power supply energy storage system. The system comprises a battery cluster; the high-voltage box is connected with the battery cluster; the charging pile can be connected with the output end of the high-voltage box, and when the charging pile is connected with the high-voltage box, the charging pile can charge the battery cluster through the high-voltage box; the input end of the DC-AC inverter can be connected with the high-voltage box, the output end of the DC-AC inverter is connected with load equipment, and when the input end of the DC-AC inverter is connected with the high-voltage box, the DC-AC inverter can convert direct current output by the high-voltage box into alternating current and supply power to the load equipment. The single-branch charging and discharging of the whole loop can be ensured, so that other branches are not influenced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery equipment, and particularly relates to a ship container power energy storage system. Background Art

[0002] At present, the power of ships uses oil or coal as the power of the ship system. However, the fossil energy power system has problems such as heavy pollution, high noise, high cost, and low conversion efficiency; and fossil energy is a non-renewable energy source, resulting in high costs for the power system. Therefore, in order to protect the environment and save energy and reduce emissions, a battery chemical energy storage power is derived as the driving power of the ship system, which not only meets the navigation power demand but also protects the ecological environment, and the advantages outweigh the disadvantages; therefore, the ship container power energy storage system has emerged as the times require.

[0003] However, most of the existing ship container power energy storage system technologies use two battery stacks for power supply, and the two battery stacks are independent of each other; moreover, each battery stack contains several battery clusters, each battery cluster corresponds to a high-voltage box and several battery packs, and each battery stack is equipped with a busbar cabinet; the battery stacks need to be installed in relatively independent battery compartments, which results in high manufacturing costs and large installation space for the entire container; the internal configuration of the busbar cabinet is UPS + lead-acid batteries, with a short power supply time and the inability to monitor the status of the lead-acid batteries; the existing ship container power energy storage system can only achieve single-stack charging or double-stack charging, and cannot achieve single-cluster charging; at the same time, most of the existing ship container power energy storage systems use one slave controller to collect the monomer temperature and voltage of the battery pack. Once the slave controller fails, the voltage and temperature of the faulty pack cannot be monitored, increasing the risk of thermal runaway. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a ship container power energy storage system that realizes charging of a single battery cluster.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: A ship container power energy storage system, comprising: a battery cluster; a high-voltage box connected to the battery cluster; a charging pile capable of being connected to the output end of the high-voltage box, and when the charging pile is connected to the high-voltage box, the charging pile can charge the battery cluster through the high-voltage box; a DC-AC inverter, the input end of the DC-AC inverter can be connected to the high-voltage box, and the output end of the DC-AC inverter is connected to a load device. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the load device.

[0006] Further, the input end of each high-voltage box is connected to at least two of the battery clusters. Each battery cluster includes a plurality of battery packs connected in series in sequence. A slave control module BMU and a temperature acquisition module BTU are provided inside the battery pack. The slave control module BMU can acquire the ambient temperature inside the battery pack, and the temperature acquisition module BTU can acquire the temperature of the cell with the highest temperature inside the battery pack. A master control BCU module is provided inside the high-voltage box, and the master control BCU module is connected to the slave control module BMU and the temperature acquisition module BTU.

[0007] Further, the energy storage system further includes a UPS module. The input end of the UPS module is connected to the output end of the DC-AC inverter and the charging pile. The output end of the UPS module is connected to the BMS system. The UPS module can supply power to the BMS system, and the charging pile can supply power to the UPS module. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the UPS module. The battery inside the UPS module is a lithium battery.

[0008] Further, the energy storage system further includes a charge and discharge port. The charging pile is provided with a charging port, and the high-voltage box is connected to the charge and discharge port. The charging pile is connected to the charge and discharge port through the charging port.

[0009] Further, the energy storage system further includes a liquid cooling unit power supply interface and a liquid cooling unit. The liquid cooling unit power supply interface can supply power to the liquid cooling unit. The charging pile and the output end of the DC-AC inverter are connected to the liquid cooling unit power supply interface. The charging pile and the DC-AC inverter can both supply power to the liquid cooling unit power supply interface. The liquid cooling unit is configured to control the temperature of the battery pack according to the temperature acquired by the slave control module BMU.

[0010] Further, the high-voltage box includes a closing circuit breaker and a battery working state control circuit. The closing circuit breaker is connected to the output end of the high-voltage box. Each battery working state control circuit is connected to one of the battery clusters and then connected to the closing circuit breaker.

[0011] Further, the battery working state control circuit includes a pre-charge protection circuit, a main negative contactor, and a secondary circuit breaker. The positive electrode of the battery cluster is connected to an input terminal of the secondary circuit breaker through the pre-charge protection circuit. The other input terminal of the secondary circuit breaker is connected to the negative electrode of the battery cluster through the main negative contactor. The two output terminals of the secondary circuit breaker are respectively connected to the two input terminals of the closing circuit breaker.

[0012] Further, the pre-charge protection circuit includes a main closing contactor, a pre-charge contactor, and a pre-charge resistor. The pre-charge contactor and the pre-charge resistor are connected in series and then connected in parallel with the main closing contactor. Both ends of the main closing contactor are respectively connected to the positive electrode of the battery cluster and the secondary circuit breaker; the main closing contactor and the pre-charge contactor are used to respond to the battery working state control signal issued by the BMS system.

[0013] Further, the battery working state control circuit further includes a fuse, and the fuse is arranged between the main closing contactor and the battery cluster.

[0014] Further, the battery working state control circuit further includes a Hall sensor, and the Hall sensor is arranged between the main negative contactor and the negative electrode of the battery cluster.

[0015] Analysis shows that the present utility model discloses a ship container type power energy storage system. The present utility model connects two clusters of battery packs in parallel to one high-voltage box, and adopts a dual-branch input and a single-branch output; after the two clusters are combined into one cluster, they are connected to the charging socket through a circuit breaker; it can ensure single-branch charging and discharging of the entire loop, thus not only not affecting other branches but also reducing costs; the battery pack is provided with a slave control module BMU and a temperature control unit. The slave control module BMU collects the normal temperature and voltage inside the battery pack; the temperature control unit collects the highest temperature of a single battery cell inside the battery pack. The slave control module BMU and the temperature control unit adopt two independent CAN communication methods with the main control inside the high-voltage box, ensuring the independence of data transmission; a dual-redundancy design at the electrical level, monitoring the temperature of the battery pack at the same time to prevent thermal runaway of the battery pack. The present utility model adopts a mode of UPS module plus lithium battery pack to replace the traditional UPS plus lead-acid battery method. The traditional lead-acid battery has a short service life and a small capacity, while the lithium battery pack has a large capacity and a long service life. When the container type power supply discharges, the 220V alternating current output by the load-side frequency converter charges the battery pack through the UPS module; when charging, the 220V alternating current inside the charging pile charges the battery pack through the UPS module; when the container type power supply is neither charging nor discharging, the battery pack supplies power to the auxiliary power supply inside the container type power supply. Description of the Drawings

[0016] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:

[0017] Figure 1 Schematic structural diagram of an embodiment of the present utility model.

[0018] Figure 2 Schematic electrical connection diagram of the high-voltage box of an embodiment of the present utility model. Detailed implementation mode

[0019] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present utility model rather than limiting the present utility model. In fact, those skilled in the art will appreciate that modifications and variations can be made to the present utility model without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Accordingly, it is intended that the present utility model cover such modifications and variations that come within the scope of the appended claims and their equivalents.

[0020] One or more examples of the present utility model are shown in the accompanying drawings. The detailed description uses numerical and alphabetical labels to refer to features in the drawings. Similar or like labels in the drawings and description have been used to refer to similar or like parts of the present utility model. As used herein, terms such as "first", "second", "third", and "fourth" etc. may be used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0021] According to an embodiment of the present utility model, a ship container-type power energy storage system is provided, including: a battery cluster;

[0022] The above-mentioned battery cluster is usually composed of a plurality of battery packs connected in series. For example, 8 battery packs can be connected in series to form a battery cluster. In the actual application process, due to different actual energy storage requirements, there are cases where the number of battery packs connected in series exceeds or is less than 8. In the following, the embodiments of the present utility model will be described by taking a battery cluster composed of 8 battery packs connected in series as an example.

[0023] A high-voltage box, the high-voltage box is connected to the battery cluster;

[0024] The above-mentioned high-voltage box can change the configuration quantity according to actual needs during actual use. The embodiments of the present utility model will be described by taking 4 high-voltage boxes as an example.

[0025] In some embodiments, the input end of each high-voltage box is connected to at least two battery clusters. For example, Figure 1 , a high-voltage box is simultaneously connected to two battery clusters, and the two battery clusters are connected to the high-voltage box in a parallel manner, that is, 8 battery clusters and 4 high-voltage boxes together form a battery stack.

[0026] In addition, a slave control module BMU and a temperature acquisition module BTU are provided inside the battery pack. The slave control module BMU can not only collect the ambient temperature inside the battery pack but also the temperature of the battery pack. The temperature acquisition module BTU can collect the temperature of the battery cell with the highest temperature inside the battery pack. Inside the high-voltage box, a master control BCU module and a charging module are provided. The master control BCU module is connected to the slave control module BMU and the temperature acquisition module BTU. The slave control module BMU and the temperature acquisition module are independent of each other. Even if one of them is damaged, the temperature of the individual battery cells in the battery pack can still be monitored continuously.

[0027] Both the master control BCU module and the charging module are connected to the external master control and external power distribution unit through low-voltage connectors; the master control BCU module communicates with both the slave control module BMU and the temperature acquisition module BTU inside the battery pack, and also communicates with the external master control. The charging module also communicates with the external master control.

[0028] A charging pile can be connected to the output end of the high-voltage box. When the charging pile is connected to the high-voltage box, the charging pile can charge the battery cluster through the high-voltage box.

[0029] The above-mentioned charging pile is connected to an external power supply and can supply power to the battery cluster through the high-voltage box.

[0030] A DC-AC inverter, the input end of the DC-AC inverter can be connected to the high-voltage box, and the output end of the DC-AC inverter is connected to a load device. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the load device.

[0031] The above-mentioned DC-AC inverter has several input ends. When the DC-AC inverter is connected to the high-voltage box, each input end is connected to a high-voltage box. The high-voltage box transmits the electrical energy of the battery cluster connected to it to the DC-AC inverter. The DC-AC inverter can perform the work of inverting direct current into alternating current and output the alternating current from the output end of the DC-AC inverter. After receiving the power supply from the DC-AC inverter, the load device can work normally.

[0032] In some embodiments of the present invention, the energy storage system further includes a UPS module. The input end of the UPS module is connected to the output end of the DC-AC inverter and the charging pile, and the output end of the UPS module is connected to the BMS system.

[0033] The UPS module can supply power to the BMS system, and the charging pile can supply power to the UPS module. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the UPS module.

[0034] The above UPS module internally has a lithium battery pack, which stores electrical energy for the UPS module.

[0035] When the UPS module powers the BMS system, it usually outputs a DC24V power supply to the BMS system to ensure the normal operation of the BMS system.

[0036] It can be understood that when the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can supply power to the UPS module, thereby charging the lithium battery pack inside the UPS module. When the charging conditions are met, the charging pile can also charge the lithium battery pack inside the UPS module.

[0037] In some embodiments of the present invention, the energy storage system further includes a charge and discharge port. The charging pile is provided with a charging port, and the high-voltage box is connected to the charge and discharge port. The charging pile is connected to the charge and discharge port through the charging port.

[0038] When the ship system is in the charging mode, connect the charge and discharge port to the charging port of the charging pile; turn on the UPS module, and the lithium battery pack inside the UPS module can supply power to the BMS system; the charging pile supplies power to the charging module inside the high-voltage box and conducts information interaction communication with the charging module inside the high-voltage box; when it is confirmed that the charging interaction conditions are met, the charging pile charges the box-type power supply; at the same time, the F1 port of the charging pile outputs an AC220V power supply to the input end of the UPS module and charges the UPS module and supplies power to other auxiliary power supplies under the action of the relevant circuits of the UPS module.

[0039] The energy storage system further includes a liquid cooling unit power supply interface and a liquid cooling unit. The liquid cooling unit power supply interface can supply power to the liquid cooling unit. The charging pile and the output end of the DC-AC inverter are connected to the liquid cooling unit power supply interface. Both the charging pile and the DC-AC inverter can supply power to the liquid cooling unit power supply interface. The liquid cooling unit is configured to control the temperature of the battery pack according to the temperature collected by the slave control module BMU.

[0040] When the above liquid cooling unit power supply interface is connected to the charging pile, the charging pile can supply power to the liquid cooling unit. When the liquid cooling unit power supply interface is connected to the DC-AC inverter, the DC-AC inverter supplies power to the liquid cooling unit power supply interface.

[0041] Specifically, during the entire charge and discharge process of the ship's box-type power supply, the liquid cooling unit performs various control methods such as heating, liquid cooling, and self-circulation on the battery pack according to the collected temperature to ensure that the battery temperature is within a reasonable range; at the same time, the corresponding fire protection system on the ship can also monitor the safety status of the entire ship's box-type power supply, effectively preventing thermal runaway.

[0042] In some embodiments of the present invention, such as Figure 2As shown, the high-voltage box includes a closing circuit breaker QF and a battery operating state control circuit. The closing circuit breaker QF is connected to the output end of the high-voltage box, and each battery operating state control circuit is connected to a battery cluster and then to the closing circuit breaker QF. The main closing contactor and the pre-charge contactor KM1 are used to respond to the battery operating state control signal issued by the BMS system. Among them, B1+, B1-, B2+, and B2- are the positive and negative poles of two battery clusters respectively, and P1+ and P1- are the positive and negative poles of the output end of the high-voltage box.

[0043] When the ship system is in the discharge mode, connect the charge and discharge port to the corresponding input end of the DC-AC inverter, connect the corresponding output end of the DC-AC inverter to the load power and the UPS input end, and at the same time connect the low-voltage plug-in to the BMS system;

[0044] It can be understood that the BMS system can control the switch state of the closing circuit breaker by sending a control signal to the closing circuit breaker QF through the low-voltage plug-in. Usually, the closing circuit breaker QF is tripped and closed through a shunt trip. The switch of the closing circuit breaker QF determines the internal opening and closing state of the high-voltage box. When the closing circuit breaker QF is disconnected, the battery cluster cannot be powered or charged through the high-voltage box.

[0045] In addition, the battery operating state control circuit includes a pre-charge protection circuit, a main negative contactor KM3, and a secondary circuit breaker QF1; the positive pole of the battery cluster is connected to an incoming line end of the secondary circuit breaker QF1 through the pre-charge protection circuit, and the other incoming line end of the secondary circuit breaker QF1 is connected to the negative pole of the battery cluster through the main negative contactor KM3. The two outgoing line ends of the secondary circuit breaker QF1 are respectively connected to the two incoming line ends of the closing circuit breaker QF.

[0046] It can be understood that the secondary circuit breaker QF1 can control the connection state of a single battery cluster and the high-voltage box. When it is necessary to disconnect the specified battery cluster from the high-voltage box, the battery cluster can be disconnected by disconnecting the secondary circuit breaker QF1.

[0047] In some embodiments of the present invention, as Figure 2 shown, the pre-charge protection circuit includes a main closing contactor, a pre-charge contactor KM1, and a pre-charge resistor R1. The pre-charge contactor KM1 and the pre-charge resistor R1 are connected in series and then connected in parallel with the main closing contactor. The two ends of the main closing contactor are respectively connected to the positive pole of the battery cluster and the secondary circuit breaker QF1;

[0048] As can be seen from the above, when the ship's box-type power energy storage system is in the discharge state, it is confirmed that the ship's box-type power energy storage system is working properly. After the BMS master control and the BMS master self-check in the BMS system have no faults and the BMS master control receives the power-on instruction sent by the ship control center controller, the master control BMS sends a command to the master BMS. After receiving the command, the master BMS sends a battery working state control signal BCU, first closes the main negative contactor KM3, the pre-charge contactor KM1, and the circuit breaker, and reduces the circulating current between clusters through the pre-charge resistor R1. When the voltage difference between the two battery clusters is small, the pre-charge contactor KM1 is disconnected, and the main positive contactor KM2 and the closing circuit breaker QF are closed; at this time, the high-voltage power-on at the battery end is completed; when the load device needs power, the DC-AC inverter works, outputs a three-phase AC 380V power supply to supply power to the load, and at the same time charges the lithium battery pack of the UPS module and supplies power to the auxiliary electrical unit of the ship's box-type power supply through the UPS module; if any battery cluster has a major fault, the DC-AC inverter stops and all high-voltage boxes disconnect the internal circuit breakers and contactors in sequence; at the same time, the other battery clusters without faults continue to operate to ensure the normal output of the system power supply; it ensures that the ship will not lack power supply due to battery faults.

[0049] In addition, when the ship's box-type power energy storage system is in the mode of not charging and not discharging, the UPS module outputs AC 220V or DC 24V power supply to the BMS system, the fire protection system and other auxiliary electrical units; the BMS system monitors the temperature and voltage status of the battery pack at all times; the fire protection system monitors the safety status of the entire system at all times.

[0050] In some embodiments of the present invention, the battery working state control circuit further includes a fuse FU1, and the fuse FU1 is arranged between the main closing contactor and the battery cluster.

[0051] In addition, the battery working state control circuit further includes a Hall sensor CT, and the Hall sensor CT is arranged between the main negative contactor KM3 and the negative pole of the battery cluster.

[0052] The above fuse FU1 can effectively guarantee the safety of the circuit during operation, and the Hall sensor CT can monitor the current status of the battery working state control circuit.

[0053] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: Two clusters of batteries are connected in parallel to one high-voltage box, and the high-voltage box adopts two-way input and one-way output inside; the circulating current problem caused by the large voltage difference between battery clusters is solved through the pre-charge resistor R1 between battery clusters; then it is connected to the charging pile or frequency converter through the charge and discharge port; the independence between clusters is ensured. Once a single cluster has a charging or discharging fault, the single cluster circuit breaker can be directly cut off without affecting the use of other clusters.

[0054] The utility model is configured with a UPS module. When the box-type power supply is placed on the ship deck and lacks power, the UPS module switches from the charging mode to the discharging mode to supply power to the BMS system and the fire controller. The BMS system monitors the voltage and temperature of each battery cell at all times, and the fire monitoring system conducts fire monitoring. When there is no lack of power, it is powered by the power battery, and the dual-redundancy design ensures the safety of the battery.

[0055] The battery pack of the utility model has a slave control module BMU and a temperature module BTU. The slave control module BMU normally collects the voltage and temperature of each cell, and the temperature module BTU collects the temperature of the highest cell. The slave control module BMU and the temperature module communicate independently. Once the slave control module BMU is damaged, the temperature acquisition module BTU can monitor the temperature of the battery pack at all times to prevent thermal runaway of the battery pack.

[0056] When the entire system of the utility model discharges, the power supply is completely taken from the box-type power supply battery pack, and it can realize remote control of the discharge output of the ship's box-type power supply system; it can also be used in cooperation with systems such as engines to provide power; it ensures the diversity and safety of the power supply of the ship system; when charging, it can directly use shore-based equipment for power supply.

[0057] Compared with the prior art, the utility model connects two clusters of battery packs in parallel to one high-voltage box and adopts a dual-branch input and a single-branch output; after the two clusters are combined into one cluster, they are connected to the charging socket through a circuit breaker; it can ensure single-branch charge and discharge of the entire circuit, thus not only not affecting other branches but also reducing costs; the battery pack is provided with a slave control module BMU and a temperature control unit. The slave control module BMU collects the normal temperature and voltage inside the battery pack; the temperature control unit collects the highest temperature of a single battery cell inside the battery pack. The slave control module BMU and the temperature control unit adopt two independent CAN communication methods with the main control inside the high-voltage box to ensure the independence of data transmission; the dual-redundancy design at the electrical level monitors the temperature of the battery pack at the same time to prevent thermal runaway of the battery pack.

[0058] The utility model adopts a mode of UPS module plus lithium battery pack to replace the traditional UPS plus lead-acid battery method. The traditional lead-acid battery has a short service life and a small capacity, while the lithium battery pack has a large capacity and a long service life. When the box-type power supply discharges, the 220V alternating current output by the load-side frequency converter charges the battery pack through the UPS module; when charging, the 220V alternating current inside the charging pile charges the battery pack through the UPS module; when the box-type power supply is neither charging nor discharging, the battery pack supplies power to the auxiliary power supply inside the box-type power supply.

[0059] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A ship box-type power energy storage system, characterized in that, Comprising: Battery cluster; High-voltage box, which is connected to the battery cluster; Charging pile, which can be connected to the output end of the high-voltage box. When the charging pile is connected to the high-voltage box, the charging pile can charge the battery cluster through the high-voltage box; DC-AC inverter, the input end of which can be connected to the high-voltage box, and the output end of which is connected to the load device. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the load device.

2. The ship box-type power energy storage system according to claim 1, wherein The input end of each high-voltage box is connected to at least two battery clusters. Each battery cluster includes a plurality of battery packs connected in series in sequence. A slave control module BMU and a temperature acquisition module BTU are arranged in the battery pack. The slave control module BMU can acquire the ambient temperature inside the battery pack, and the temperature acquisition module BTU can acquire the temperature of the cell with the highest temperature in the battery pack. A master control BCU module is arranged inside the high-voltage box, and the master control BCU module is connected to the slave control module BMU and the temperature acquisition module BTU.

3. The shipboard box-type power energy storage system according to claim 2, characterized in that, The energy storage system further includes a UPS module. The input end of the UPS module is connected to both the output end of the DC-AC inverter and the charging pile, and the output end of the UPS module is connected to the BMS system; The UPS module can supply power to the BMS system, and the charging pile can supply power to the UPS module. When the input end of the DC-AC inverter is connected to the high-voltage box, the DC-AC inverter can convert the direct current output by the high-voltage box into alternating current and supply power to the UPS module; The battery inside the UPS module is a lithium battery.

4. The shipboard box-type power energy storage system according to claim 3, wherein, The energy storage system further includes a charge and discharge port. A charging port is arranged on the charging pile, and the high-voltage box is connected to the charge and discharge port. The charging pile is connected to the charge and discharge port through the charging port.

5. A ship box-type power energy storage system according to claim 4, characterized in that The energy storage system further includes a liquid cooling unit power supply interface and a liquid cooling unit. The liquid cooling unit power supply interface can supply power to the liquid cooling unit. The charging pile and the output end of the DC-AC inverter are connected to the liquid cooling unit power supply interface. Both the charging pile and the DC-AC inverter can supply power to the liquid cooling unit power supply interface. The liquid cooling unit is configured to control the temperature of the battery pack according to the temperature acquired by the slave control module BMU.

6. The ship box-type power energy storage system according to claim 3, wherein, The high-voltage box includes a closing circuit breaker and a battery working state control circuit. The closing circuit breaker is connected to the output end of the high-voltage box. Each battery working state control circuit is connected to a battery cluster and then connected to the closing circuit breaker.

7. A ship box-type power energy storage system according to claim 6, characterized in that, The battery working state control circuit includes a pre-charge protection circuit, a main negative contactor, and a secondary circuit breaker; The positive electrode of the battery cluster is connected to an incoming terminal of the secondary circuit breaker through a pre-charge protection circuit. The other incoming terminal of the secondary circuit breaker is connected to the negative electrode of the battery cluster through the main negative contactor. The two outgoing terminals of the secondary circuit breaker are respectively connected to the two incoming terminals of the closing circuit breaker.

8. A ship box-type power energy storage system according to claim 7, characterized in that, The pre-charge protection circuit includes a main closing contactor, a pre-charge contactor, and a pre-charge resistor. The pre-charge contactor and the pre-charge resistor are connected in series and then in parallel with the main closing contactor. The two ends of the main closing contactor are respectively connected to the positive electrode of the battery cluster and the secondary circuit breaker. The main closing contactor and the pre-charge contactor are used to respond to the battery operating state control signal issued by the BMS system.

9. The shipboard box-type power energy storage system according to claim 8, characterized in that, The battery operating state control circuit further includes a fuse, which is arranged between the main closing contactor and the battery cluster.

10. A ship box-type power energy storage system according to claim 8, characterized in that, The battery operating state control circuit further includes a Hall sensor, which is arranged between the main negative contactor and the negative electrode of the battery cluster.

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