Marine energy storage system and charging method thereof

Abstract

The embodiment of the invention discloses a marine energy storage system and a charging method thereof. The charging method of the marine energy storage system comprises the following steps: receiving a charging instruction for charging the marine energy storage system and acquiring charging information of the marine energy storage system to determine whether a charging interface and a discharging interface of the marine energy storage system are independent or not, and after the charging interface and the discharging interface exist in the charging interface, charging the marine energy storage system through the charging instruction. On-off information of a discharging switch corresponding to the discharging interface is obtained, and if the on-off information shows that the discharging switch is in a closed state, the discharging switch is switched off, and a charging switch corresponding to the discharging interface is switched on, so that power is supplied to the marine energy storage system. The charging strategy of the marine energy storage system can be flexibly adjusted, and the reliability of the marine energy storage system is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a marine energy storage system and a charging method thereof. Background Art

[0002] With the maturity of electric propulsion technology, all-electric ships have become the main direction of future ship design. In this context, marine energy storage systems, as an important component of modern ship design, have gradually evolved from providing energy for auxiliary loads to providing energy for multiple types of ship loads. In particular, as an important component of the ship's power system, they work with various types of ship main and auxiliary engines to improve the ship's economic and environmental characteristics while meeting the various load requirements of the ship. However, existing marine energy storage systems generally follow the architecture of land-based energy storage systems and are not optimized for the actual use environment of the ship, resulting in poor flexibility of the ship energy storage system during the charging process. Summary of the Invention

[0003] In response to the deficiencies of the prior art, the present application provides a ship energy storage system and a charging method thereof, aiming to solve the technical problem of poor flexibility of the ship energy storage system during the charging process in the prior art.

[0004] To solve the above problems, in a first aspect, the present application provides a charging method for a marine energy storage system, wherein the marine energy storage system includes at least one power supply branch, the power supply branch includes at least one battery pack and a high-voltage box, and the high-voltage box is provided with a charging and discharging interface; the charging method includes: If a charging instruction for charging the marine energy storage system is received, the charging information of the marine energy storage system is obtained; Determine whether the charging and discharging interfaces have separate charging interfaces and discharging interfaces according to the charging information; If the charging and discharging interface has a charging interface and a discharging interface, obtain the on / off information of the discharge switch corresponding to the discharge interface; If the on / off information shows that the discharge switch is in the closed state, disconnect the discharge switch; Close the charging switch corresponding to the discharge interface and charge the battery pack in the power supply branch where the charging switch is located.

[0005] In a second aspect, the present application further provides a marine energy storage system, which is applied to the charging method of the energy storage system provided in the second aspect. The marine energy storage system includes at least one power supply branch, and the power supply branch includes: High-voltage box; An energy storage device, comprising at least one battery pack, the battery pack being electrically connected to the high-voltage box; The high-voltage box is provided with a charging and discharging interface, which is electrically connected to the ship's power distribution system and / or the charging and discharging device.

[0006] The present application provides a method for charging a marine energy storage system. After receiving a charging instruction to charge the marine energy storage system, the method obtains charging information of the marine energy storage system to determine whether the charging and discharging interfaces of the marine energy storage system have separate charging and discharging interfaces. If the charging and discharging interfaces have separate charging and discharging interfaces, the method obtains on-off information of a discharge switch corresponding to the discharge interface. If the on-off information indicates that the discharge switch is closed, the discharge switch is opened and the charging switch corresponding to the discharge interface is closed to power the marine energy storage system. This method can flexibly adjust the charging strategy of the marine energy storage system after changes in the charging and discharging interfaces of the marine energy storage system, thereby greatly improving the reliability of the marine energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0008] Figure 1 A first schematic block diagram of a marine energy storage system provided in an embodiment of the present application; Figure 2 A second schematic block diagram of a marine energy storage system provided in an embodiment of the present application; Figure 3 A third schematic block diagram of a marine energy storage system provided in an embodiment of the present application; Figure 4 A fourth schematic block diagram of a marine energy storage system provided in an embodiment of the present application; Figure 5 A schematic flow chart of a method for charging a marine energy storage system according to an embodiment of the present application. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0010] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0011] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0012] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0013] In addition, in this application, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood based on the specific implementation.

[0014] See also Figure 1 , Figure 1 This is a first schematic block diagram of a marine energy storage system provided in an embodiment of the present application. Figure 1 As shown, the present application provides a marine energy storage system, which includes at least one power supply branch, and the power supply branch includes: High-voltage box 100; The energy storage device 200 is electrically connected to the high-voltage box 100; The high-voltage box 100 is provided with a charging and discharging interface, which is electrically connected to the ship's power distribution system and / or the charging and discharging device.

[0015] In this embodiment, the charging interface 120 and the discharging interface 110 of the marine energy storage system are integrated into one interface, namely the charging and discharging interface, which can be provided on the high-voltage box 100. At the same time, the high-voltage box 100 is also provided with a first interface 160 and a second interface 170. The energy storage device 200 is provided with a positive battery electrode and a negative battery electrode. The positive battery electrode is electrically connected to the first interface 160, and the negative battery electrode is electrically connected to the second interface 170. The high-voltage box 100 includes a first switching circuit 130 and a second switching circuit 140. The charging and discharging interface includes a positive charging and discharging electrode 111 and a negative charging and discharging electrode 112. The first switching circuit 130 is provided between the first interface 160 and the positive charging and discharging electrode 111, and the second switching circuit 140 is provided between the second interface 170 and the negative charging and discharging electrode 112. The first switching circuit 130 and the second switching circuit 140 are both provided with a switch for controlling the on / off of the main circuit of the power supply branch. The switch can be a relay.

[0016] The ship can adopt the ship energy storage system mentioned in the above embodiment. When the above ship energy storage system needs to be charged, it is usually necessary to separate the above ship energy storage system from the ship, that is, the charging and discharging interface is separated from the ship power distribution system and electrically connected to the charging and discharging device to realize charging of the ship energy storage system.

[0017] When the marine energy storage system is separated from the ship and electrically connected to the charging and discharging device, the second switch circuit 140 can be turned on first, and then the first switch circuit 130 can be turned on to complete the power supply branch. After the power supply branch is powered on, the battery pack 201 in the power supply branch can be charged.

[0018] See also Figure 2 , Figure 2 This is a second schematic block diagram of the marine energy storage system provided in the embodiment of the present application. Figure 2 As shown, the present application provides a marine energy storage system, which includes at least one power supply branch, and the power supply branch includes: The high-voltage box 100 is provided with a first interface 160 and a second interface 170; The energy storage device 200 is provided with a battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected to the first interface 160, and the battery negative electrode is electrically connected to the second interface 170; The high-voltage box 100 is further provided with a charging interface 120 and a discharging interface 110 . The charging interface 120 is electrically connected to the charging and discharging device, and the discharging interface 110 is electrically connected to the ship's power distribution system.

[0019] In this embodiment, the ship energy storage system can be a ship container energy storage system, which includes at least one power supply branch, in which a high-voltage box 100 and an energy storage device 200 are provided. The high-voltage box 100 is separately provided with a charging interface 120 and a discharging interface 110. The charging interface 120 is electrically connected to the charging and discharging device to charge the power supply branch on the energy storage system, and the discharging interface 110 is electrically connected to the ship power distribution system to distribute the electric energy output by the power supply branch for use by the ship, thereby achieving better independent control and protection of the battery charging and discharging process, greatly improving the safety and reliability of the ship energy storage system.

[0020] At the same time, the ship energy storage system provided in the present application may include multiple power supply branches, each power supply branch is provided with a high-voltage box 100 and an energy storage device 200, and the high-voltage box 100 is separately provided with a charging interface 120 and a discharge interface 110. After the power supply branches are connected in parallel, the multiple charging interfaces 120 on each high-voltage box 100 can be integrated into an interface for charging, and the multiple discharge interfaces 110 on each high-voltage box 100 can be integrated into an interface for discharging.

[0021] Specifically, the marine energy storage system described in this application is a two-stage energy storage system, which can also be expanded to a three-stage energy storage system. When this is expanded to a three-stage energy storage system, a combiner cabinet can be connected to the rear end of the high-voltage box 100, and the circuitry within the combiner cabinet can be designed to be similar to that within the high-voltage box 100, thereby realizing a three-stage marine energy storage system.

[0022] The energy storage device 200 mentioned in this application may include multiple battery packs 201, which are connected in series to form a battery cluster for a marine energy storage system. By providing multiple battery packs 201 in the energy storage device 200, and connecting each battery pack 201 in series with fuses and / or relays, this application not only increases the voltage of the power supply branch but also enhances the safety performance of the power supply branch. Furthermore, when the energy storage device 200 includes multiple battery packs 201, the multiple battery packs 201 may also be connected in parallel to form a battery cluster for a marine energy storage system.

[0023] At the same time, each battery pack 201 may also include a fuse and at least one battery cell. The fuse and the at least one battery cell are connected in series and are respectively connected to the input and output ends of the battery pack 201, or each battery pack 201 includes at least one fuse and at least one battery cell. The fuse and the battery cell are connected in series one by one and are respectively electrically connected to the input and output ends to achieve parallel connection. Then, when a short circuit occurs in the battery pack 201, a second fuse can be used to promptly cut off the circuit where the battery pack 201 is located to ensure the safety of the battery pack 201.

[0024] The marine energy storage system provided in the present application includes at least one power supply branch, which includes a high-voltage box 100 and an energy storage device 200. The high-voltage box 100 is provided with a first interface 160, a second interface 170, a charging interface 120 and a discharging interface 110. The energy storage device 200 is provided with a positive battery electrode and a negative battery electrode. The positive battery electrode is electrically connected to the first interface 160, the negative battery electrode is electrically connected to the second interface 170, the charging interface 120 is electrically connected to the charging and discharging device, and the discharging interface 110 is electrically connected to the marine power distribution system, thereby achieving the separation of the charging interface 120 and the discharging interface 110 of the marine energy storage system, thereby better achieving independent control and protection of the battery charging and discharging process. At the same time, when the marine energy storage system needs to be charged, it is also possible to avoid separating the marine energy storage system from the ship, greatly improving the safety, reliability and practicality of the marine energy storage system.

[0025] In some embodiments, as Figure 2 As shown, the high-voltage box 100 includes a first switching circuit 130 and a second switching circuit 140, the charging interface 120 includes a charging positive pole 121 and a charging negative pole 122, and the discharging interface 110 includes a discharging positive pole 111 and a discharging negative pole 112; wherein, one end of the first switching circuit 130 is electrically connected to the first interface 160, and the other end of the first switching circuit 130 is electrically connected to the charging positive pole 121 and the discharging positive pole 111 respectively; one end of the second switching circuit 140 is electrically connected to the second interface 170, and the other end of the second switching circuit 140 is electrically connected to the charging negative pole 122 and the discharging negative pole 112 respectively.

[0026] In this embodiment, by setting a first switch circuit 130 and a second switch circuit 140 in the high-voltage box, the discharge positive electrode 111 of the discharge interface 110 and the charging positive electrode 121 of the charging interface 120 are both electrically connected to the first interface 160 through the first switch circuit 130, so as to realize the electrical connection with the battery positive electrode of the energy storage device 200; the discharge negative electrode 112 of the discharge interface 110 and the charging negative electrode 122 of the charging interface 120 are both electrically connected to the second interface 170 through the second switch circuit 140, so as to realize the electrical connection with the battery negative electrode of the energy storage device, so that when the marine energy storage system needs to discharge, the first switch circuit 130 and the second switch circuit 140 can be used to connect the discharge positive electrode 111 of the discharge interface 110 and the charging negative electrode 122 of the charging interface 120. The two switch circuits 140 respectively disconnect the path between the charging positive electrode 121 and the first interface 160, and the path between the charging negative electrode 122 and the second interface 170, to ensure normal discharge of the marine energy storage system. When the marine energy storage system needs to be charged, the first switch circuit 130 and the second switch circuit 140 respectively disconnect the path between the discharge positive electrode 111 and the first interface 160, and the path between the discharge negative electrode 112 and the second interface 170, to ensure normal charging of the marine energy storage system. This can better achieve independent control and protection of the battery charging and discharging process, greatly improving the safety and reliability of the marine energy storage system.

[0027] Furthermore, in some embodiments, Figure 3 As shown, the first switch circuit 130 includes a first discharge switch 131 and a first charge switch 132; wherein, one end of the first discharge switch 131 and one end of the first charge switch 132 are both electrically connected to the first interface 160, the other end of the first discharge switch 131 is electrically connected to the discharge positive electrode 111, and the other end of the first charge switch 132 is electrically connected to the charging positive electrode 121.

[0028] In this embodiment, the on and off of the first discharge switch 131 and the first charge switch 132 can be controlled by the battery management system of the marine energy storage system. The first discharge switch 131 and the first charge switch 132 can both be relays.

[0029] The battery management system (BMS) is responsible for battery charge and discharge management, condition monitoring and analysis, power management, and protection. Specifically, through systematic management, the BMS prevents overcharging, over-discharging, and overheating of the battery, thereby improving the performance and service life of the battery.

[0030] Meanwhile, in marine energy storage systems, the battery management system typically includes a domain management unit, a cluster management unit, a module management unit, and a safety module, which can communicate with the integrated control system to achieve more efficient battery management. Furthermore, the battery management system can adopt a modular design and can be expanded according to the battery composition to adapt to different application scenarios.

[0031] Furthermore, in some embodiments, Figure 3 As shown, the second switch circuit 140 includes a second discharge switch 141 and a second charge switch 142; wherein, one end of the second discharge switch 141 and one end of the second charge switch 142 are both electrically connected to the second interface 170, the other end of the second discharge switch 141 is electrically connected to the discharge negative electrode 112, and the other end of the second charge switch 142 is electrically connected to the charge negative electrode 122.

[0032] In this embodiment, the on and off of the second discharge switch 141 and the second charge switch 142 can be controlled by the battery management system of the marine energy storage system, and the second discharge switch 141 and the second charge switch 142 can both be relays.

[0033] In addition, the first discharge switch 131, the second discharge switch 141, the first charging switch 132 and the second charging switch 142 can also be controlled by the ship management system. The on-off control method of the first discharge switch 131, the second discharge switch 141, the first charging switch 132 and the second charging switch 142 mentioned in this application can be selected according to actual application, and this application does not make specific limitations.

[0034] In some embodiments, as Figure 4 As shown, the high-voltage box 100 further includes a balancing circuit 150 ; wherein one end of the balancing circuit 150 is electrically connected to the first interface 160 , and the other end of the balancing circuit 150 is electrically connected to the discharge positive electrode 111 and / or the charging positive electrode 121 .

[0035] Since the voltage internal resistance of each battery cell in the marine energy storage system varies, the differences become more significant after the cells are integrated into a battery cluster. Therefore, before discharging, the marine energy storage system also needs to balance the batteries on each power supply branch to ensure voltage consistency between the power supply branches.

[0036] In this embodiment, a balancing circuit 150 can be provided between the first interface 160 and the positive discharge electrode 111, so that when the marine energy storage system needs to discharge, the balancing circuit 150 can be used for balancing to ensure voltage consistency between the power supply branches. At the same time, it can also avoid the inrush current during the charging and discharging of the marine energy storage system. Specifically, when the power supply branch is powered on, the main negative switch in the high-voltage box 100, that is, the second discharge switch 141, can be closed first, and then the balancing circuit 150 can be turned on. After a preset time, the main positive switch in the high-voltage box 100, that is, the first discharge switch 131, can be closed, and then the balancing circuit 150 can be turned off, thereby significantly improving the startup performance and safety of the marine energy storage system.

[0037] Furthermore, in some embodiments, Figure 4 As shown, the balancing circuit 150 includes a balancing switch 151 and a balancing resistor 152; wherein, one end of the balancing switch 151 is electrically connected to the first interface 160, the other end of the balancing switch 151 is electrically connected to one end of the balancing resistor 152, and the other end of the balancing resistor 152 is electrically connected to the discharge positive electrode 111.

[0038] In this embodiment, the on / off of the balancing switch 151 can be controlled by a battery management system, and the balancing switch 151 can be a relay. Furthermore, the on / off of the balancing switch 151 can also be controlled by a ship management system. The on / off control of the balancing switch 151 can be selected based on actual application and is not specifically limited in this application.

[0039] In some embodiments, the energy storage device 200 and the high-voltage box 100 communicate with each other using a communication interface.

[0040] In this embodiment, the energy storage device 200 may include multiple battery packs 201. Each battery pack 201 may be provided with a communication interface, and the communication interfaces between the battery packs 201 may be electrically connected for communication. Simultaneously, the high-voltage box 100 may also be provided with a communication interface, and the communication interfaces between the battery packs 201 and the high-voltage box 100 may be electrically connected for communication. Consequently, the battery management system or the ship management system may manage the high-voltage box 100 and the battery packs 201 through the communication interfaces of the battery packs 201 and the high-voltage box 100, thereby better achieving independent control and protection of the battery charging and discharging process, greatly improving the safety and reliability of the marine energy storage system.

[0041] In some embodiments, the charging and discharging device is a charger or a charging pile.

[0042] Specifically, a charger is a device used to provide electrical energy to a battery. It adopts high-frequency power supply technology and uses advanced intelligent dynamic adjustment charging technology. It has the characteristics of high charging efficiency, simple operation, light weight, and small size. Chargers are widely used in various fields, including electric vehicles, electric motorcycles, electric forklifts, etc. The charger mentioned in this application is mainly used in the field of ships, and it can be installed on ships. Charging piles are important infrastructure for providing electrical energy to electric vehicles, and their functions are similar to those of gas pumps at gas stations. The charging piles mentioned in this application are mainly used to provide electrical energy for ship energy storage systems.

[0043] In some embodiments, the discharge interface 110 is electrically connected to a shipboard power distribution system, which includes a DC / AC converter, an energy storage converter, or a DC distribution board.

[0044] A marine power distribution system can be part of a vessel's electrical system. The switchboards within a marine power distribution system can be a variety of types, including main switchboards and emergency switchboards. The marine main switchboard can be used in various ship power plants to control, monitor, and protect generator sets and distribute power to the grid.

[0045] In this embodiment, a DC / AC converter, an energy storage converter, and a DC distribution board can be installed in a shipboard power distribution system. The DC / AC converter, also known as an inverter, is a device that converts direct current (DC) to alternating current (AC). The DC / AC converter primarily uses power semiconductor devices (such as IGBTs or MOSFETs) to achieve DC-to-AC conversion. The energy storage converter can control the charging and discharging processes of the power supply branch and perform AC-to-DC conversion. It can also directly power AC loads in the absence of a power grid. The DC distribution board is a device used to distribute and manage DC power and is widely used in various industries, ships, and new energy fields.

[0046] It should be understood that the marine energy storage system provided in the above embodiments is merely an example. The marine energy storage system described in the embodiments of this application is intended to more clearly illustrate the technical solutions of the embodiments of this application and does not constitute a limitation of the technical solutions provided in the embodiments of this application. Persons skilled in the art will appreciate that as systems evolve and new business scenarios emerge, the technical solutions provided in the embodiments of this application will be equally applicable to similar technical problems. These are described in detail below.

[0047] It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments. The following describes in detail the method for charging a marine energy storage system. Furthermore, the method for charging a marine energy storage system provided in this application can be executed by a battery management system.

[0048] See also Figure 5 , Figure 5 This is a flow chart of a method for charging a marine energy storage system provided in an embodiment of the present application. Figure 5 As shown, the method includes steps S110 to S150.

[0049] S110: If a charging instruction for charging the marine energy storage system is received, charging information of the marine energy storage system is obtained.

[0050] S120: Determine whether the charging and discharging interfaces include separate charging and discharging interfaces based on the charging information.

[0051] In this embodiment, the charging instruction is a command requesting charging of the marine energy storage system. The charging instruction can be issued by a ship management system, an automated manifest system, a planned maintenance system, a ship energy management system, or the like to the battery management system of the marine energy storage system. The charging information is configuration information of the marine energy storage system.

[0052] Specifically, since the charging and discharging interface of the ship energy storage system can be the same charging and discharging interface or different charging and discharging interface, different charging and discharging interface means that the charging and discharging interface of the ship energy storage system includes two independent charging interfaces 120 and discharging interfaces 110. Therefore, after receiving the charging instruction to charge the ship energy storage system, the battery management system needs to determine whether the charging and discharging interface has a separate charging interface 120 and a discharging interface 110 based on the charging information of the ship energy storage system. If the charging and discharging interface has a separate charging interface 120 and a discharging interface 110, the strategy of different charging and discharging interfaces can be adopted to charge the ship energy storage system; if the charging and discharging interface does not have a separate charging interface 120 and a discharging interface 110, the strategy of the same charging and discharging interface can be adopted to charge the ship energy storage system. Among them, different charging and discharging interfaces means that the ship energy storage system includes a separate charging interface and a discharging interface, and the same charging and discharging interface means that the charging interface and the discharging interface of the ship energy storage system are integrated into one interface.

[0053] In some embodiments, before determining whether the charging and discharging interface has a separate charging interface and discharging interface based on the charging information, it also includes: if the charging information contains preset first information, determining whether the communication connection between the charging and discharging interface and the charging pile is successful; if the communication connection between the charging and discharging interface and the charging pile is successful, performing fault detection on the ship energy storage system to obtain fault detection information of the ship energy storage system.

[0054] Specifically, the first information may be a charging connection confirmation signal. Since the marine energy storage system may be charged using a charging pile, the battery management system must first confirm whether the charging pile is used for charging after receiving a charging instruction to charge the marine energy storage system. If the charging pile is used for charging, it is necessary to determine whether the charging connection confirmation signal sent by the charging pile at the charging and discharging interface to the battery management system of the marine energy storage system is received, that is, the first information. If the charging connection confirmation signal sent by the charging pile is received, it can be determined whether the communication connection between the charging and discharging interface and the charging pile is successful. At this time, the battery management system can run a self-test program to perform fault detection on the marine energy storage system, thereby obtaining information on whether there is a fault in the marine energy storage system.

[0055] Among them, the charging connection confirmation signal can be a CC2 signal. After the charging pile is electrically connected to the charging interface 120 on the high-voltage box 100 of the marine energy storage system, the battery management system of the marine energy storage system can detect the CC2 signal and be awakened. After being awakened by the CC2 signal, the battery management system can run a self-test program to perform fault detection on the marine energy storage system, thereby obtaining information on whether there is a fault in the marine energy storage system.

[0056] In some embodiments, before determining whether there are separate charging interfaces and discharging interfaces based on the charging information, the method further includes: if the charging information contains preset second information, determining whether the charging instruction is valid; if the charging instruction is valid, determining whether the communication connection with the ship management system is successful; if the communication connection with the ship management system is successful, performing fault detection on the ship energy storage system to obtain fault detection information.

[0057] In this embodiment, the second information is the absence of a charging connection confirmation signal in the charging information. When the battery management system does not detect the charging connection signal, that is, the second information is present in the charging information, it can be confirmed that the marine energy storage system is not being charged using a charging pile, but may be being charged using a charger. To this end, after failing to detect the charging connection signal, the battery management system needs to confirm whether the charging instruction sent by the ship management system to the battery management system is valid. If the charging instruction is valid, the battery management system is awakened and runs a self-test program to perform fault detection on the marine energy storage system, thereby obtaining information on whether the marine energy storage system is faulty. If the charging instruction is invalid, charging protection is required for the marine energy storage system, and a charging failure alarm is generated.

[0058] At the same time, before the battery management system runs the self-test program, if the charging and discharging interface of the high-voltage box 100 is not electrically connected to the charging pile, but is electrically connected to the charging device, it is necessary to further determine whether the battery management system and the ship management system are successfully communicated. If the communication connection is successful, the self-test program can be run to perform fault detection on the ship energy storage system.

[0059] In some embodiments, before determining whether the charge and discharge interface has a separate charge interface and discharge interface based on the charging information, it also includes: if the charging information contains preset third information, determining whether the current at the charge and discharge interface flows from the charge and discharge interface to the battery pack 201; if the current at the charge and discharge interface flows from the charge and discharge interface to the battery pack 201, performing fault detection on the marine energy storage system to obtain fault detection information.

[0060] In this embodiment, the third information may be the second information, that is, the third information is that there is no charging connection confirmation signal in the charging information. After failing to detect the charging connection signal, the battery management system may also determine whether the marine energy storage system needs to be charged by determining whether the current at the charging and discharging interface flows from the charging and discharging interface to the battery pack 201, that is, determining the direction of the current at the charging and discharging interface. If the current at the charging and discharging interface flows from the charging and discharging interface to the battery pack 201, it may be determined that the marine energy storage system needs to be charged, and the battery management system is awakened and runs a self-test program to perform fault detection on the marine energy storage system, thereby obtaining information on whether there is a fault in the marine energy storage system.

[0061] At the same time, the present application can also determine whether the current at the charge and discharge interface flows from the charge and discharge interface to the battery pack 201 after the charging instruction is invalid; if the current at the charge and discharge interface flows from the charge and discharge interface to the battery pack 201, it can be determined that the marine energy storage system needs to be charged, and then the battery management system is awakened and runs the self-test program to perform fault detection on the marine energy storage system, thereby obtaining information on whether there is a fault in the marine energy storage system.

[0062] In some embodiments, before performing fault detection on the marine energy storage system and obtaining fault detection information of the marine energy storage system, the method further includes: obtaining the current temperature of the battery pack.

[0063] Specifically, after the battery management system determines that the ship's energy storage system needs to be charged, the battery temperature in the ship's energy storage system may be low due to the water environment of the ship. If the self-test program is directly run to detect faults in the ship's energy storage system, a fault may be displayed due to the low battery temperature. To this end, after determining that the marine energy storage system needs to be charged, the battery management system needs to first obtain the current temperature of the battery pack 201 in the marine energy storage system and determine whether the current temperature of the battery pack 201 meets the charging requirements, that is, the current temperature of the battery pack 201 is not less than the first temperature and not greater than the second temperature. At this time, the self-test program can be run to perform fault detection on the marine energy storage system; if the current temperature of the battery pack 201 does not meet the charging requirements, that is, the current temperature of the battery pack 201 is less than the first temperature, the battery pack 201 needs to be heated so that the temperature of the battery pack 201 is not less than the first temperature and not greater than the second temperature; if the current temperature of the battery pack 201 is greater than the second temperature, the battery pack 201 needs to be cooled until the temperature of the battery pack 201 is not less than the first temperature and not greater than the second temperature. Only then can the self-test program be run to perform fault detection on the marine energy storage system.

[0064] The first temperature may be a critical temperature for determining whether the marine energy storage system needs to be heated, and the second temperature may be a critical temperature for determining whether the marine energy storage system needs to be cooled. The first and second temperatures may be determined based on the battery pack 201 itself and are not specifically limited in this application.

[0065] In some embodiments, after obtaining the current temperature of the battery pack, it also includes: if the current temperature is lower than the first temperature, generating a heating instruction to heat the battery pack; after a preset first time, detecting the temperature of the battery pack again to determine whether there is a heating fault in the marine energy storage system.

[0066] In this embodiment, when the current temperature of the battery pack 201 in the marine energy storage system is lower than the first temperature, it can be determined that the temperature of the battery pack 201 is too low. At this time, the battery management system generates a heating instruction to heat the battery pack 201. The device for heating the battery pack 201 in the marine energy storage system, such as closing the heating relay to heat the battery pack 201, detects the temperature of the battery pack 201 after a preset first time. If the temperature of the battery pack 201 is between the first temperature and the second temperature, the heating relay can be disconnected, and a self-test program can be run to perform fault detection on the marine energy storage system. If the temperature of the battery pack 201 still does not reach the first temperature, it can be determined that a heating fault has occurred in the marine energy storage system. At this time, the heating relay needs to be disconnected, and the marine energy storage system needs to be charged and protected, and an alarm message of charging failure is generated.

[0067] S130: If the charging and discharging interface includes a separate charging interface and a discharging interface, obtain on / off information of a discharging switch corresponding to the discharging interface.

[0068] In this embodiment, after determining whether the charging and discharging interfaces have separate charging interfaces 120 and discharging interfaces 110, the charging device electrically connected to the charging and discharging interfaces may be on the ship, and at this time, the ship's energy storage system may still be supplying power to the ship. To this end, after determining whether the charging and discharging interfaces have separate charging interfaces 120 and discharging interfaces 110, the present application also needs to obtain the on-off information of the discharge switch corresponding to the discharge interface 110 to determine whether the ship's energy storage system is still supplying power to the ship. If the on-off information shows that the discharge switch is closed, the discharge switch needs to be disconnected, and then the charging switch corresponding to the discharge interface 110 needs to be closed to supply power to the ship's energy storage system.

[0069] S140: If the on-off information shows that the discharge switch is in a closed state, disconnect the discharge switch.

[0070] In this embodiment, the discharge switch may be the first discharge switch 131 of the first switch circuit 130 and the second discharge switch 141 of the second switch circuit 140 in the high-voltage box 100. Specifically, if the on-off information indicates that the first discharge switch 131 and the second discharge switch 141 are in a closed state, the first discharge switch 131 and the second discharge switch 141 need to be opened in sequence to ensure that the ship power distribution system and the ship energy storage system are disconnected.

[0071] S150: Close the charging switch corresponding to the charging interface, and charge the battery pack in the power supply branch where the charging switch is located.

[0072] Specifically, after the shipboard energy storage system and the shipboard power distribution system are disconnected, the charging switch in the high-voltage box 100 can be closed to charge the power supply branch where the charging switch is located. The charging switch can be the first charging switch 132 of the first switch circuit 130 and the second charging switch 142 of the second switch circuit 140 in the high-voltage box 100. Specifically, after the shipboard energy storage system and the shipboard power distribution system are disconnected, the second charging switch 142 and the first charging switch 132 can be closed in sequence.

[0073] In some embodiments, charging the battery pack 201 in the power supply branch where the charging switch is located includes: if an abnormality is detected in the power supply branch where the battery pack 201 is located, disconnecting the main circuit of the power supply branch where the battery pack 201 is located; determining the number of power supply branches in the ship energy storage system that do not have abnormalities, and adjusting the charging current of the ship energy storage system according to the number of branches to charge the power supply branches that do not have abnormalities.

[0074] Specifically, when the marine energy storage system is in the formal charging stage, that is, when the first charging switch 132 and the second charging switch 142 in the high-voltage box 100 are both in the closed state, the battery management system can monitor the key parameters of the marine energy storage system, such as voltage, current, temperature, SOC, SOH, internal resistance, etc. When an abnormality is detected in a key parameter of the marine energy storage system, it can be pre-determined whether a trigger is triggered to stop charging the marine energy storage system. If the trigger does not need to stop charging the marine energy storage system, for example, an abnormality occurs in a power supply branch of the marine energy storage system, the main circuit of the power supply branch where the battery pack 201 is located can be disconnected, and the charging current of the marine energy storage system can be adjusted, that is, other power supply branches that have not had an abnormality can continue to be charged. Among them, when adjusting the charging current of the marine energy storage system, it can be determined based on the number of power supply branches that have not had an abnormality in the energy storage system.

[0075] In some embodiments, after detecting that the power supply branch where the battery pack is located is abnormal, it also includes: determining whether to trigger the disconnection of the main circuit of the power supply branch where the battery pack 201 is located; if the disconnection of the main circuit of the power supply branch where the battery pack 201 is located is not triggered, determining whether to trigger the reduction of the charging current of the power supply branch where the battery pack 201 is located; if the reduction of the charging current of the power supply branch where the battery pack 201 is located is triggered, adjusting the charging current of the power supply branch where the battery pack 201 is located to charge the power supply branch where the battery pack 201 is located.

[0076] Specifically, during the charging process of the ship energy storage system, the battery pack 201 may have a low temperature due to the low water temperature in the area where the ship is located, causing an abnormality in the power supply branch. At this time, there is no need to disconnect the main circuit of the power supply branch where the battery pack 201 is located, and it is sufficient to reduce the charging current of the power supply branch.

[0077] Therefore, when an abnormality is detected in the power supply branch where the battery pack 201 is located, it can first be determined whether to trigger disconnection of the main circuit of the power supply branch where the battery pack 201 is located. If disconnection of the main circuit of the power supply branch where the battery pack 201 is located is not triggered, it can be determined whether to trigger reduction of the charging current of the power supply branch where the battery pack 201 is located. If reduction of the charging current of the power supply branch where the battery pack 201 is located is triggered, the charging current of the power supply branch where the battery pack 201 is located is adjusted to charge the power supply branch where the battery pack 201 is located. Specifically, when adjusting the charging current of the power supply branch where the battery pack 201 is located, the charging current can be adjusted to half of the normal charging current.

[0078] In some embodiments, charging the battery pack 201 in the power supply branch where the charging switch is located includes: if there is a cell voltage in the battery pack 201 greater than or equal to a preset first voltage, adjusting the charging current of the battery pack 201 to a preset first current; after a preset second time, adjusting the charging current of the battery pack 201 to a preset second current; wherein the second current is less than or equal to the first current; after a preset third time, adjusting the charging current of the battery pack 201 to a preset third current; wherein the third current is less than or equal to the second current.

[0079] Specifically, to avoid excessive voltage differences between the terminal voltages of each power supply branch after the marine energy storage system is fully charged, the charging current can be reduced at least once at the charging terminal of the marine energy storage system. The charging terminal can be understood as the SOH of the marine energy storage system reaching 80% or above. The charging terminal can also be understood as the voltage of a single cell in the marine energy storage system being no less than a preset first voltage, such as 3.48V. It should be noted that the specific value of the charging terminal can be selected based on actual application and is not specifically limited in this application.

[0080] In this embodiment, if there is a cell voltage in the battery pack 201 that is greater than or equal to a preset first voltage, the charging current of the battery pack 201 is reduced to a first current, and after a second time, the charging current of the battery pack 201 is reduced from the first current to a second current, and then after a third time, the charging current of the battery pack 201 is reduced from the second current to a third current, thereby avoiding excessive voltage differences between the terminal voltages of each power supply branch.

[0081] In some embodiments, after adjusting the charging current of the battery pack 201 to a preset third current, it also includes: if the voltage of all cells in the battery pack 201 is greater than or equal to a preset second voltage, generating a stop charging instruction for the battery pack 201, and obtaining the loop current of the battery pack 201; wherein, the second voltage is greater than the first voltage; after a preset fourth time, obtaining the loop current of the battery pack 201; if the loop current is less than or equal to the preset fourth current, disconnecting the charging switch in the high-voltage box 100 where the battery pack 201 is located; if the loop current is greater than the fourth current, determining that there is a charging fault in the marine energy storage system.

[0082] Specifically, after the charging current of the marine energy storage system is reduced multiple times, the present application determines that the corresponding battery pack 201 has completed charging when the voltage of the single cell in the battery pack 201 is greater than or equal to a preset second voltage, such as 3.5V. The battery pack 201 is calibrated to 100% SOC and a stop charging instruction is generated for the battery pack 201. After a preset fourth time, the loop current of the battery pack 201 is obtained from the power supply branch where the battery pack 201 is located, and a determination is made as to whether the loop current is less than or equal to a preset fourth current, such as 5A. If the loop current is less than or equal to the fourth current, the first charging switch 132 and the second charging switch 142 in the high-voltage box 100 can be disconnected in sequence. If the loop current is greater than the fourth current, it can be determined that the power supply branch has failed, and charging protection of the marine energy storage system is required. A charging failure alarm is also generated. The fourth time can be 5s.

[0083] In addition, at any time during the charging of the marine energy storage system, if the ship management system sends a stop charging instruction to the battery management system, the battery management system can control the marine energy storage system to charge.

[0084] The present application provides a charging method for a marine energy storage system. After receiving a charging instruction to charge the marine energy storage system, the method obtains charging information of the marine energy storage system to determine whether the charging and discharging interfaces of the marine energy storage system have separate charging interfaces 120 and discharging interfaces 110. If the charging and discharging interfaces have the charging and discharging interfaces 120 and 110, the method obtains on-off information of a discharge switch corresponding to the discharge interface 110. If the on-off information indicates that the discharge switch is closed, the discharge switch is opened and the charging switch corresponding to the discharge interface 110 is closed to power the marine energy storage system. This method can flexibly adjust the charging strategy of the marine energy storage system after changes in the charging and discharging interfaces of the marine energy storage system, thereby greatly improving the reliability of the marine energy storage system.

[0085] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for charging a marine energy storage system, characterized in that: The marine energy storage system comprises at least one power supply branch, the power supply branch comprises at least one battery pack and a high-voltage box, and the high-voltage box is provided with a charging and discharging interface; the charging method comprises: If a charging instruction for charging the marine energy storage system is received, obtaining charging information of the marine energy storage system; Determine whether the charging and discharging interface has a separate charging interface and a discharging interface according to the charging information; If the charging and discharging interface has a separate charging interface and a discharging interface, obtaining on-off information of a discharging switch corresponding to the discharging interface; If the on-off information shows that the discharge switch is in a closed state, disconnecting the discharge switch; The charging switch corresponding to the charging interface is closed, and the energy storage device in the power supply branch where the charging switch is located is charged.

2. The method for charging a marine energy storage system according to claim 1, characterized in that: Before determining whether the charging and discharging interface has a separate charging interface and a discharging interface according to the charging information, the method further includes: If the charging information contains preset first information, determining whether the communication connection between the charging and discharging interface and the charging pile is successful; If the communication connection between the charging and discharging interface and the charging pile is successful, a fault detection is performed on the marine energy storage system to obtain fault detection information of the marine energy storage system.

3. The method for charging a marine energy storage system according to claim 1, characterized in that: Before determining whether the charging and discharging interface has a separate charging interface and a discharging interface according to the charging information, the method further includes: If the charging information contains preset second information, determining whether the charging instruction is valid; If the charging instruction is valid, determining whether the communication connection with the ship management system is successful; If the communication connection with the ship management system is successful, a fault detection is performed on the ship energy storage system to obtain the fault detection information.

4. The method for charging a marine energy storage system according to claim 1, characterized in that: Before determining whether the charging and discharging interface has a separate charging interface and a discharging interface according to the signal detection information, the method further includes: If the charging information contains preset third information, determining whether the current at the charging and discharging interface flows from the charging and discharging interface to the battery pack; If the current at the charging and discharging interface flows from the charging and discharging interface to the battery pack, a fault detection is performed on the marine energy storage system to obtain the fault detection information.

5. The method for charging a marine energy storage system according to any one of claims 2 to 4, characterized in that: Before performing fault detection on the marine energy storage system to obtain fault detection information of the marine energy storage system, the method further includes: Obtaining the current temperature of the battery pack; If the current temperature is lower than a preset first temperature, generating a heating instruction to heat the battery pack; After a preset first time, the temperature of the battery pack is detected again to determine whether there is a heating fault in the marine energy storage system.

6. The method for charging a marine energy storage system according to any one of claims 1 to 4, characterized in that: The step of charging the energy storage device in the power supply branch where the charging switch is located includes: If it is detected that the power supply branch where the battery pack is located is abnormal, disconnect the main circuit of the power supply branch where the battery pack is located; The number of power supply branches in the marine energy storage system that do not have abnormalities is determined, and the charging current of the marine energy storage system is adjusted according to the number of branches to charge the power supply branches that do not have abnormalities.

7. The method for charging a marine energy storage system according to claim 6, characterized in that: After the power supply branch where the battery pack is located is detected to be abnormal, the method further includes: Determine whether to trigger disconnection of the main circuit of the power supply branch where the battery pack is located; If disconnecting the main circuit of the power supply branch where the battery pack is located is not triggered, determining whether to trigger reducing the charging current of the power supply branch where the battery pack is located; If the charging current of the power supply branch where the battery pack is located is triggered to be reduced, the charging current of the power supply branch where the battery pack is located is adjusted to charge the power supply branch where the battery pack is located.

8. The method for charging a marine energy storage system according to any one of claims 1 to 4, characterized in that: The step of charging the battery pack in the power supply branch where the charging switch is located includes: If there is a cell voltage in the battery pack that is greater than or equal to a preset first voltage, adjusting the charging current of the battery pack to a preset first current; After a preset second time, adjusting the charging current of the battery pack to a preset second current; wherein the second current is less than or equal to the first current; After a preset third time, the charging current of the battery pack is adjusted to a preset third current; wherein the third current is less than or equal to the second current.

9. The method for charging a marine energy storage system according to claim 8, characterized in that: After adjusting the charging current of the battery pack to a preset third current, the method further includes: If the voltage of all cells in the battery pack is greater than or equal to a preset second voltage, a stop charging instruction for the battery pack is generated, and a loop current of the battery pack is obtained; wherein the second voltage is greater than the first voltage; After a preset fourth time, obtaining a loop current of the battery pack; If the loop current is less than or equal to a preset fourth current, disconnecting a charging switch in the high-voltage box where the battery pack is located; If the loop current is greater than the fourth current, it is determined that a charging fault exists in the marine energy storage system.

10. A marine energy storage system, characterized in that: The charging method for an energy storage system applied to any one of claims 1 to 9, wherein the marine energy storage system comprises at least one power supply branch, and the power supply branch comprises: High voltage box; An energy storage device, comprising at least one battery pack, wherein the battery pack is electrically connected to the high voltage box; Wherein, the high-voltage box is provided with a charging and discharging interface, and the charging and discharging interface is electrically connected to the ship power distribution system and / or the charging and discharging device.

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