Marine energy storage system

Abstract

The marine energy storage system comprises at least one power supply branch, the power supply branch comprises a high-voltage box and an energy storage device, the high-voltage box is provided with a first interface, a second interface, a charging interface and a discharging interface, the energy storage device is provided with a battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected with the first interface, and the battery negative electrode is electrically connected with the second interface. The charging interface is electrically connected with the charging and discharging device, and the discharging interface is electrically connected with the marine power distribution system, so that the charging interface and the discharging interface of the marine energy storage system are separated, independent control and protection of the charging and discharging process of the battery can be better realized, and meanwhile, when the marine energy storage system needs to be charged, the charging and discharging of the battery can be realized. The marine energy storage system is prevented from being separated from the ship, and the safety, reliability and practicability of the marine energy storage system are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a marine energy storage system. BACKGROUND

[0002] With the maturity of electric propulsion technology, all-electric ships have become the main direction of future ship design. Under this background, the marine energy storage system as an important part of modern ship design has gradually developed from auxiliary load power supply to multi-type ship load power supply, especially as an important part of the ship power system and various ship main / auxiliary machines. Under the premise of meeting the demand of various loads of the ship, the economic / environmental characteristics of the ship are improved. However, the existing marine energy storage system usually follows the architecture of the land energy storage system, which is not optimized for the actual use environment of the ship, resulting in poor safety performance of the marine energy storage system in the actual use process. CONTENT OF THE UTILITY MODEL

[0003] In view of the defects of the prior art, the present application provides a marine energy storage system, which aims to solve the technical problem of poor safety performance of the marine energy storage system in the prior art.

[0004] To solve the above problems, the present application provides a marine energy storage system, which comprises at least one power supply branch, and the power supply branch comprises:

[0005] A high-voltage box is provided with a first interface and a second interface;

[0006] An energy storage device is provided with a battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected to the first interface, and the battery negative electrode is electrically connected to the second interface;

[0007] Wherein, the high-voltage box is provided with a charging interface and a discharging interface, the charging interface is electrically connected to the charge and discharge device, and the discharging interface is electrically connected to the marine power distribution system.

[0008] Further, in the marine energy storage system provided by the present application, the high-voltage box comprises a first switch circuit and a second switch circuit, the charging interface comprises a charging positive electrode and a charging negative electrode, and the discharging interface comprises a discharging positive electrode and a discharging negative electrode;

[0009] Wherein, one end of the first switch circuit is electrically connected to the first interface, and the other end of the first switch circuit is respectively electrically connected to the charging positive electrode and the discharging positive electrode; one end of the second switch circuit is electrically connected to the second interface, and the other end of the second switch circuit is respectively electrically connected to the charging negative electrode and the discharging negative electrode.

[0010] Still further, in the marine energy storage system provided by the present application, the first switch circuit comprises a first discharging switch and a first charging switch;

[0011] One end of the first discharge switch and one end of the first charging switch are electrically connected to the first interface, the other end of the first discharge switch is electrically connected to the discharge positive electrode, and the other end of the first charging switch is electrically connected to the charging positive electrode.

[0012] Further, in the marine energy storage system provided in the application, the first discharge switch and the first charging switch are both relays.

[0013] Further, in the marine energy storage system provided in the application, the second switch circuit includes a second discharge switch and a second charging switch.

[0014] One end of the second discharge switch and one end of the second charging switch are electrically connected to the second interface, the other end of the second discharge switch is electrically connected to the discharge negative electrode, and the other end of the second charging switch is electrically connected to the charging negative electrode.

[0015] Further, in the marine energy storage system provided in the application, the second discharge switch and the second charging switch are both relays.

[0016] Further, in the marine energy storage system provided in the application, the high-voltage box further includes a balancing circuit.

[0017] One end of the balancing circuit is electrically connected to the first interface, and the other end of the balancing circuit is electrically connected to the discharge positive electrode or / and the charging positive electrode.

[0018] Further, in the marine energy storage system provided in the application, the balancing circuit includes a balancing switch and a balancing resistor.

[0019] One end of the balancing switch is electrically connected to the first interface, the other end of the balancing switch is electrically connected to one end of the balancing resistor, and the other end of the balancing resistor is electrically connected to the discharge positive electrode.

[0020] Further, in the marine energy storage system provided in the application, the balancing switch is a relay.

[0021] Further, in the marine energy storage system provided in the application, the energy storage device and the high-voltage box communicate through a communication interface; or / and,

[0022] The charging and discharging device is a charger or a charging pile; or / and,

[0023] The discharge interface is electrically connected to the marine power distribution system, and the marine power distribution system includes a DC / AC converter or an energy storage converter or a direct current distribution panel.

[0024] Further, in the marine energy storage system provided in the application, the energy storage device includes a plurality of battery packs, and the plurality of battery packs are connected in series to form a battery positive electrode and a battery negative electrode; or / and,

[0025] The plurality of battery packs are connected in parallel to form a battery positive electrode and a battery negative electrode.

[0026] The marine energy storage system provided by the application comprises at least one power supply branch, the power supply branch comprises a high-voltage box and an energy storage device, the high-voltage box is provided with a first interface, a second interface, a charging interface and a discharging interface, the energy storage device is provided with a battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected to the first interface, the battery negative electrode is electrically connected to the second interface, the charging interface is electrically connected to the charging and discharging device, and the discharging interface is electrically connected to the marine power distribution system, so that the charging interface and the discharging interface of the marine energy storage system are separated, the independent control and protection of the battery charging and discharging process can be better realized, and the marine energy storage system can be charged without being separated from the ship, thereby greatly improving the safety, reliability and practicability of the marine energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The first schematic block diagram of the marine energy storage system provided by the embodiment of the application;

[0029] Figure 2 The second schematic block diagram of the marine energy storage system provided by the embodiment of the application;

[0030] Figure 3 The third schematic block diagram of the marine energy storage system provided by the embodiment of the application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be described clearly and completely in the following with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, not all embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0032] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or sets thereof.

[0033] It should also be understood that the terms used herein are for the purpose of describing particular embodiments and are not intended to limit the application. As used in the specification and the appended claims, the singular forms "a," "an" and "the" are intended to include plural forms unless the context clearly dictates otherwise.

[0034] It should be further understood that the term "and / or" used in the specification and the appended claims herein is intended to refer to any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0035] In addition, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral, which can be understood, or mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific implementation situation.

[0036] Please refer to Figure 1 , Figure 1 The first schematic block diagram of the marine energy storage system provided by the embodiments of the application. As Figure 1 shown, the application provides a marine energy storage system, which comprises at least one power supply branch, the power supply branch comprising:

[0037] The high-voltage box 100 is provided with a first interface 160 and a second interface 170;

[0038] The energy storage device 200 is provided with a battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected with the first interface 160, and the battery negative electrode is electrically connected with the second interface 170;

[0039] Wherein, 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 with the charging and discharging device, and the discharging interface 110 is electrically connected with the marine power distribution system.

[0040] In the embodiment, the ship energy storage system can be a ship container energy storage system, which comprises at least one power supply branch, the power supply branch is provided with a high-voltage box 100 and an energy storage device 200, 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 a charging and discharging device to charge the power supply branch of the energy storage system, and the discharging interface 110 is electrically connected to a ship power distribution system to distribute the power output by the power supply branch and supply the ship, so that the independent control and protection of the battery charging and discharging process are better realized, and the safety and reliability of the ship energy storage system are greatly improved.

[0041] Meanwhile, the ship energy storage system provided by the application can comprise a plurality of power supply branches, each of which 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 discharging interface 110. After being connected in parallel, the plurality of charging interfaces 120 on each high-voltage box 100 can be integrated into one interface for charging, and the plurality of discharging interfaces 110 on each high-voltage box 100 can be integrated into one interface for discharging.

[0042] Specifically, the ship energy storage system mentioned by the application is a two-level architecture energy storage system, which can also be extended to a three-level architecture energy storage system. When it is extended to a three-level architecture energy storage system, a busbar cabinet can be connected to the rear end of the high-voltage box 100, and the circuit inside the busbar cabinet can be designed similar to the circuit inside the high-voltage box 100, so as to realize a three-level architecture ship energy storage system.

[0043] The energy storage device 200 mentioned by the application can comprise a plurality of battery packs 201, and the plurality of battery packs 201 are connected in series to form a cluster of batteries of the ship energy storage system. By arranging a plurality of battery packs 201 in the energy storage device 200, and connecting each battery pack 201 in series while also connecting a fuse or / and a relay in series, the voltage of the power supply branch can be improved, and the safety performance of the power supply branch can be enhanced. In addition, when the energy storage device 200 comprises a plurality of battery packs 201, the plurality of battery packs 201 can also be connected in parallel to form a cluster of batteries of the ship energy storage system.

[0044] Meanwhile, each battery pack 201 can also comprise a fuse and at least one battery core, and the fuse and the at least one battery core are connected in series and connected to the input end and the output end of the battery pack 201, respectively, or each battery pack 201 comprises at least one fuse and at least one battery core, and the fuse and the battery core are connected in series one by one and electrically connected to the input end and the output end, respectively, to realize parallel connection, so that when the battery pack 201 is short-circuited, the second fuse can cut off the loop where the battery pack 201 is located in time, so as to ensure the safety of the battery pack 201.

[0045] The marine energy storage system provided by the application comprises at least one power supply branch, the power supply branch comprises 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 battery positive electrode and a battery negative electrode, the battery positive electrode is electrically connected to the first interface 160, the battery negative electrode is electrically connected to the second interface 170, the charging interface 120 is electrically connected to a charging and discharging device, and the discharging interface 110 is electrically connected to a marine power distribution system, so that the charging interface 120 and the discharging interface 110 of the marine energy storage system are separated, the independent control and protection of the battery charging and discharging process can be better realized, the marine energy storage system can be charged without being separated from the ship when necessary, and the safety, reliability and practicability of the marine energy storage system are greatly improved.

[0046] In some embodiments, as shown in Figure 1 The high-voltage box 100 comprises a first switch circuit 130 and a second switch circuit 140, the charging interface 120 comprises a charging positive electrode 121 and a charging negative electrode 122, and the discharging interface 110 comprises a discharging positive electrode 111 and a discharging negative electrode 112; one end of the first switch circuit 130 is electrically connected to the first interface 160, and the other end of the first switch circuit 130 is respectively electrically connected to the charging positive electrode 121 and the discharging positive electrode 111; one end of the second switch circuit 140 is electrically connected to the second interface 170, and the other end of the second switch circuit 140 is respectively electrically connected to the charging negative electrode 122 and the discharging negative electrode 112.

[0047] In the embodiment, the discharging positive electrode 111 of the discharging 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 to realize the electrical connection with the battery positive electrode of the energy storage device 200, and the discharging negative electrode 112 of the discharging 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 to realize the electrical connection with the battery negative electrode of the energy storage device 200, so that when the marine energy storage system needs to be discharged, the first switch circuit 130 and the second switch circuit 140 are respectively used to 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 the normal discharge of the marine energy storage system, and when the marine energy storage system needs to be charged, the first switch circuit 130 and the second switch circuit 140 are respectively used to disconnect the path between the discharging positive electrode 111 and the first interface 160 and the path between the discharging negative electrode 112 and the second interface 170 to ensure the normal charge of the marine energy storage system, so that the independent control and protection of the battery charging and discharging process can be better realized, and the safety and reliability of the marine energy storage system are greatly improved.

[0048] Further, in some embodiments, as shown in Figure 2 The first discharging switch 131 has one end electrically connected to the first interface 160, and the other end electrically connected to the discharging positive electrode 111. The first charging switch 132 has one end electrically connected to the first interface 160, and the other end electrically connected to the charging positive electrode 121.

[0049] In the present embodiment, the on-off of the first discharging switch 131 and the first charging switch 132 can be controlled by the battery management system of the marine energy storage system, and the first discharging switch 131 and the first charging switch 132 can each be a relay.

[0050] The battery management system is responsible for the charging and discharging management, state monitoring and analysis, power management and protection of the battery of the marine energy storage system. Specifically, the battery management system can avoid overcharging, over-discharging, over-temperature and other situations of the battery of the marine energy storage system through systematic management, thereby improving the performance and service life of the battery of the marine energy storage system.

[0051] At the same time, in the marine energy storage system, the battery management system usually includes domain management unit, cluster management unit, module management unit and safety module, etc., and can communicate with the integrated control system to realize more efficient battery management. In addition, the battery management system can also adopt modular design, which can be expanded according to the composition of the battery to adapt to different application scenarios.

[0052] Further, in some embodiments, as shown in Figure 2 The second discharging switch 141 has one end electrically connected to the second interface 170, and the other end electrically connected to the discharging negative electrode 112. The second charging switch 142 has one end electrically connected to the second interface 170, and the other end electrically connected to the charging negative electrode 122.

[0053] In the present embodiment, the on-off of the second discharging switch 141 and the second charging switch 142 can be controlled by the battery management system of the marine energy storage system, and the second discharging switch 141 and the second charging switch 142 can each be a relay.

[0054] 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 the actual application, and this application does not make specific limitations.

[0055] In some embodiments, such as Figure 3 As shown, the high-voltage box 100 also includes an equalization circuit 150; wherein, one end of the equalization circuit 150 is electrically connected to the first interface 160, and the other end of the equalization circuit 150 is electrically connected to the discharge positive terminal 111 and / or the charging positive terminal 121.

[0056] Because the internal resistance of each cell in a marine energy storage system varies, and the differences become even more pronounced after the cells are integrated into a battery cluster, the marine energy storage system needs to balance the batteries on each power supply branch before discharging to ensure voltage consistency between the power supply branches.

[0057] In this embodiment, an equalization circuit 150 can be provided between the first interface 160 and the discharge positive terminal 111. This allows the equalization circuit 150 to balance the voltage of each power supply branch when the marine energy storage system needs to discharge, ensuring voltage consistency between the power supply branches. It also helps prevent inrush current during charging and discharging of the marine energy storage system. Specifically, when a power supply branch is powered on, the main negative switch in the high-voltage box 100, i.e., the second discharge switch 141, can be closed first, followed by the equalization circuit 150. After a preset time, the main positive switch in the high-voltage box 100, i.e., the first discharge switch 131, can be closed, and then the equalization circuit 150 can be disconnected. This significantly improves the startup performance and safety of the marine energy storage system.

[0058] Furthermore, in some embodiments, such as Figure 3 As shown, the equalization circuit 150 includes an equalization switch 151 and an equalization resistor 152; wherein, one end of the equalization switch 151 is electrically connected to the first interface 160, the other end of the equalization switch 151 is electrically connected to one end of the equalization resistor 152, and the other end of the equalization resistor 152 is electrically connected to the discharge positive terminal 111.

[0059] In this embodiment, the switching on and off of the equalization switch 151 can be controlled by the battery management system, and the equalization switch 151 can be a relay. Alternatively, the switching on and off of the equalization switch 151 can also be controlled by the ship management system. The switching control of the equalization switch 151 can be selected according to the actual application, and this application does not impose specific limitations.

[0060] In some embodiments, the energy storage device 200 and the high-voltage box 100 communicate with each other via a communication interface.

[0061] In the embodiment, the energy storage device 200 can include a plurality of battery packs 201, and each battery pack 201 can be provided with a communication interface. The communication interfaces between the battery packs 201 can be electrically connected to communicate with each other. Meanwhile, the high-voltage box 100 can also be provided with a communication interface, and the communication interfaces between the battery packs 201 and the high-voltage box 100 can be electrically connected to communicate with each other. Therefore, the battery management system or the ship management system can manage the high-voltage box 100 and the battery packs 201 through the communication interfaces of the battery packs 201 and the communication interface of the high-voltage box 100, so that the independent control and protection of the charging and discharging process of the battery can be better realized, and the safety and reliability of the marine energy storage system can be greatly improved.

[0062] In some embodiments, the charging and discharging device is a charger or a charging pile.

[0063] Specifically, the charger is a device for providing power to the battery. It uses high-frequency power supply technology and advanced intelligent dynamic adjustment charging technology, and has the characteristics of high charging efficiency, simple operation, light weight and small size. The charger is widely used in various fields, including electric vehicles, electric motorcycles, electric forklifts, etc. The charger mentioned in the present application is mainly used in the field of ships, and can be installed on the ship. The charging pile is an important infrastructure for providing power to electric vehicles, and its function is similar to that of a fuel dispenser at a gas station. The charging pile mentioned in the present application is mainly used to provide power for the ship energy storage system.

[0064] In some embodiments, the discharging interface 110 is electrically connected to a marine power distribution system, and the marine power distribution system includes a DC / AC converter or an energy storage converter or a direct current distribution panel.

[0065] The marine power distribution system can be part of the electrical system of the ship, and the power distribution panel in the marine power distribution system can be a main power distribution panel, an emergency power distribution panel, etc. Among them, the marine main power distribution panel can be suitable for various ship power stations, and is used to control, monitor and protect the generator set and the distribution network.

[0066] In the embodiment, the DC / AC converter, the energy storage converter and the direct current distribution panel can be provided in the marine 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 mainly converts DC to AC through power semiconductor devices (such as IGBT or MOSFET). The energy storage converter can control the charging and discharging process of the power supply branch and convert AC and DC. At the same time, it can also directly supply power to AC loads in the absence of a power grid. The direct current distribution panel is a device for distributing and managing direct current power, and is widely used in various industries, ships and new energy fields.

[0067] The above description is provided as an enabling teaching of the application and is not intended to limit its scope in any way. Any modification of the application in keeping with the spirit thereof that is apparent to those skilled in the art is to be considered within the scope of the application as defined by the appended claims.

Claims

1. A marine energy storage system, characterized in that, It includes at least one power supply branch, said power supply branch including: The high-voltage box is equipped with a first interface and a second interface; An energy storage device is provided with a battery positive terminal and a battery negative terminal, wherein the battery positive terminal is electrically connected to the first interface and the battery negative terminal is electrically connected to the second interface; The high-voltage box is also equipped with a charging interface and a discharging interface. The charging interface is electrically connected to the charging and discharging device, and the discharging interface is electrically connected to the marine power distribution system.

2. The marine energy storage system according to claim 1, characterized in that, The high-voltage box includes a first switching circuit and a second switching circuit, the charging interface includes a charging positive terminal and a charging negative terminal, and the discharging interface includes a discharging positive terminal and a discharging negative terminal. Wherein, one end of the first switching circuit is electrically connected to the first interface, and the other end of the first switching circuit is electrically connected to the charging positive terminal and the discharging positive terminal respectively; one end of the second switching circuit is electrically connected to the second interface, and the other end of the second switching circuit is electrically connected to the charging negative terminal and the discharging negative terminal respectively.

3. The marine energy storage system according to claim 2, characterized in that, The first switching circuit includes a first discharge switch and a first charging switch; One end of the first discharge switch and one end of the first charging switch are both electrically connected to the first interface, the other end of the first discharge switch is electrically connected to the discharge positive terminal, and the other end of the first charging switch is electrically connected to the charging positive terminal.

4. The marine energy storage system according to claim 3, characterized in that, Both the first discharge switch and the first charging switch are relays.

5. The marine energy storage system according to claim 2, characterized in that, The second switching circuit includes a second discharge switch and a second charging switch; One end of the second discharge switch and one end of the second charging switch are both electrically connected to the second interface, the other end of the second discharge switch is electrically connected to the discharge negative terminal, and the other end of the second charging switch is electrically connected to the charging negative terminal.

6. The marine energy storage system according to claim 5, characterized in that, Both the second discharge switch and the second charging switch are relays.

7. The marine energy storage system according to claim 2, characterized in that, The high-voltage box also includes an equalization circuit; One end of the equalization circuit is electrically connected to the first interface, and the other end of the equalization circuit is electrically connected to the discharge positive terminal and / or the charging positive terminal.

8. The marine energy storage system according to claim 7, characterized in that, The equalization circuit includes an equalization switch and an equalization resistor; One end of the equalization switch is electrically connected to the first interface, the other end of the equalization switch is electrically connected to one end of the equalization resistor, and the other end of the equalization resistor is electrically connected to the discharge positive terminal.

9. The marine energy storage system according to claim 8, characterized in that, The equalization switch is a relay.

10. The marine energy storage system according to any one of claims 1-9, characterized in that, The energy storage device and the high-voltage box communicate via a communication interface; or / and, The charging and discharging device is a charger or a charging pile; or / and, The discharge interface is electrically connected to the marine power distribution system, which includes a DC / AC converter, an energy storage converter, or a DC power distribution board.

11. The marine energy storage system according to any one of claims 1-9, characterized in that, The energy storage device includes multiple battery packs connected in series to form the positive and negative terminals of the batteries; or, multiple battery packs connected in parallel to form the positive and negative terminals of the batteries.

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